FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
cli.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  * cli.c: Unix stdin/socket CLI.
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 /**
40  * @file
41  * @brief Unix stdin/socket command line interface.
42  * Provides a command line interface so humans can interact with VPP.
43  * This is predominantly a debugging and testing mechanism.
44  */
45 /*? %%clicmd:group_label Command line session %% ?*/
46 /*? %%syscfg:group_label Command line session %% ?*/
47 
48 #include <vlib/vlib.h>
49 #include <vlib/unix/unix.h>
50 #include <vppinfra/timer.h>
51 
52 #include <ctype.h>
53 #include <fcntl.h>
54 #include <sys/stat.h>
55 #include <termios.h>
56 #include <signal.h>
57 #include <unistd.h>
58 #include <arpa/telnet.h>
59 #include <sys/ioctl.h>
60 #include <sys/types.h>
61 #include <unistd.h>
62 #include <limits.h>
63 #include <netinet/tcp.h>
64 
65 /** ANSI escape code. */
66 #define ESC "\x1b"
67 
68 /** ANSI Control Sequence Introducer. */
69 #define CSI ESC "["
70 
71 /** ANSI clear screen. */
72 #define ANSI_CLEAR CSI "2J" CSI "1;1H"
73 /** ANSI reset color settings. */
74 #define ANSI_RESET CSI "0m"
75 /** ANSI Start bold text. */
76 #define ANSI_BOLD CSI "1m"
77 /** ANSI Stop bold text. */
78 #define ANSI_DIM CSI "2m"
79 /** ANSI Start dark red text. */
80 #define ANSI_DRED ANSI_DIM CSI "31m"
81 /** ANSI Start bright red text. */
82 #define ANSI_BRED ANSI_BOLD CSI "31m"
83 /** ANSI clear line cursor is on. */
84 #define ANSI_CLEARLINE CSI "2K"
85 /** ANSI scroll screen down one line. */
86 #define ANSI_SCROLLDN CSI "1T"
87 /** ANSI save cursor position. */
88 #define ANSI_SAVECURSOR CSI "s"
89 /** ANSI restore cursor position if previously saved. */
90 #define ANSI_RESTCURSOR CSI "u"
91 
92 /** Maximum depth into a byte stream from which to compile a Telnet
93  * protocol message. This is a safety measure. */
94 #define UNIX_CLI_MAX_DEPTH_TELNET 24
95 
96 /** Maximum terminal width we will accept */
97 #define UNIX_CLI_MAX_TERMINAL_WIDTH 512
98 /** Maximum terminal height we will accept */
99 #define UNIX_CLI_MAX_TERMINAL_HEIGHT 512
100 /** Default terminal height */
101 #define UNIX_CLI_DEFAULT_TERMINAL_HEIGHT 24
102 /** Default terminal width */
103 #define UNIX_CLI_DEFAULT_TERMINAL_WIDTH 80
104 
105 /** A CLI banner line. */
106 typedef struct
107 {
108  u8 *line; /**< The line to print. */
109  u32 length; /**< The length of the line without terminating NUL. */
111 
112 #define _(a) { .line = (u8 *)(a), .length = sizeof(a) - 1 }
113 /** Plain welcome banner. */
114 static unix_cli_banner_t unix_cli_banner[] = {
115  _(" _______ _ _ _____ ___ \n"),
116  _(" __/ __/ _ \\ (_)__ | | / / _ \\/ _ \\\n"),
117  _(" _/ _// // / / / _ \\ | |/ / ___/ ___/\n"),
118  _(" /_/ /____(_)_/\\___/ |___/_/ /_/ \n"),
119  _("\n")
120 };
121 
122 /** ANSI color welcome banner. */
123 static unix_cli_banner_t unix_cli_banner_color[] = {
124  _(ANSI_BRED " _______ _ " ANSI_RESET " _ _____ ___ \n"),
125  _(ANSI_BRED " __/ __/ _ \\ (_)__ " ANSI_RESET " | | / / _ \\/ _ \\\n"),
126  _(ANSI_BRED " _/ _// // / / / _ \\" ANSI_RESET " | |/ / ___/ ___/\n"),
127  _(ANSI_BRED " /_/ /____(_)_/\\___/" ANSI_RESET " |___/_/ /_/ \n"),
128  _("\n")
129 };
130 
131 #undef _
132 
133 /** Pager line index */
134 typedef struct
135 {
136  /** Index into pager_vector */
138 
139  /** Offset of the string in the line */
141 
142  /** Length of the string in the line */
145 
146 
147 /** Unix CLI session. */
148 typedef struct
149 {
150  /** The file index held by unix.c */
152 
153  /** Vector of output pending write to file descriptor. */
155 
156  /** Vector of input saved by Unix input node to be processed by
157  CLI process. */
159 
160  /** This session has command history. */
162  /** Array of vectors of commands in the history. */
164  /** The command currently pointed at by the history cursor. */
166  /** How far from the end of the history array the user has browsed. */
168 
169  /** Maximum number of history entries this session will store. */
171 
172  /** Current command line counter */
174 
175  /** The string being searched for in the history. */
177  /** If non-zero then the CLI is searching in the history array.
178  * - @c -1 means search backwards.
179  * - @c 1 means search forwards.
180  */
182 
183  /** Position of the insert cursor on the current input line */
185 
186  /** Line mode or char mode */
188 
189  /** Set if the CRLF mode wants CR + LF */
191 
192  /** Can we do ANSI output? */
194 
195  /** Has the session started? */
197 
198  /** Disable the pager? */
200 
201  /** Whether the session is interactive or not.
202  * Controls things like initial banner, the CLI prompt etc. */
204 
205  /** Whether the session is attached to a socket. */
207 
208  /** If EPIPE has been detected, prevent further write-related
209  * activity on the descriptor.
210  */
212 
213  /** Pager buffer */
215 
216  /** Index of line fragments in the pager buffer */
218 
219  /** Line number of top of page */
221 
222  /** Terminal width */
224 
225  /** Terminal height */
227 
228  /** Process node identifier */
230 
231  /** The current direction of cursor travel.
232  * This is important since when advancing left-to-right, at the
233  * right hand edge of the console the terminal typically defers
234  * wrapping the cursor to the next line until a character is
235  * actually displayed.
236  * This messes up our heuristic for whether to use ANSI to return
237  * the cursor to the end of the line and instead we have to
238  * nudge the cursor to the next line.
239  * A Value of @c 0 means we're advancing left-to-right; @c 1 means
240  * the opposite.
241  */
243 
245 
246 /** Resets the pager buffer and other data.
247  * @param f The CLI session whose pager needs to be reset.
248  */
249 always_inline void
251 {
252  u8 **p;
253 
254  f->pager_start = 0;
255 
256  vec_free (f->pager_index);
257  f->pager_index = 0;
258 
259  vec_foreach (p, f->pager_vector)
260  {
261  vec_free (*p);
262  }
263  vec_free (f->pager_vector);
264  f->pager_vector = 0;
265 }
266 
267 /** Release storage used by a CLI session.
268  * @param f The CLI session whose storage needs to be released.
269  */
270 always_inline void
272 {
273  vec_free (f->output_vector);
274  vec_free (f->input_vector);
276 }
277 
278 /** CLI actions */
279 typedef enum
280 {
281  UNIX_CLI_PARSE_ACTION_NOACTION = 0, /**< No action */
282  UNIX_CLI_PARSE_ACTION_CRLF, /**< Carriage return, newline or enter */
283  UNIX_CLI_PARSE_ACTION_TAB, /**< Tab key */
284  UNIX_CLI_PARSE_ACTION_ERASE, /**< Erase cursor left */
285  UNIX_CLI_PARSE_ACTION_ERASERIGHT, /**< Erase cursor right */
286  UNIX_CLI_PARSE_ACTION_UP, /**< Up arrow */
287  UNIX_CLI_PARSE_ACTION_DOWN, /**< Down arrow */
288  UNIX_CLI_PARSE_ACTION_LEFT, /**< Left arrow */
289  UNIX_CLI_PARSE_ACTION_RIGHT, /**< Right arrow */
290  UNIX_CLI_PARSE_ACTION_HOME, /**< Home key (jump to start of line) */
291  UNIX_CLI_PARSE_ACTION_END, /**< End key (jump to end of line) */
292  UNIX_CLI_PARSE_ACTION_WORDLEFT, /**< Jump cursor to start of left word */
293  UNIX_CLI_PARSE_ACTION_WORDRIGHT, /**< Jump cursor to start of right word */
294  UNIX_CLI_PARSE_ACTION_ERASELINELEFT, /**< Erase line to left of cursor */
295  UNIX_CLI_PARSE_ACTION_ERASELINERIGHT, /**< Erase line to right & including cursor */
296  UNIX_CLI_PARSE_ACTION_CLEAR, /**< Clear the terminal */
297  UNIX_CLI_PARSE_ACTION_REVSEARCH, /**< Search backwards in command history */
298  UNIX_CLI_PARSE_ACTION_FWDSEARCH, /**< Search forwards in command history */
299  UNIX_CLI_PARSE_ACTION_YANK, /**< Undo last erase action */
300  UNIX_CLI_PARSE_ACTION_TELNETIAC, /**< Telnet control code */
301 
302  UNIX_CLI_PARSE_ACTION_PAGER_CRLF, /**< Enter pressed (CR, CRLF, LF, etc) */
303  UNIX_CLI_PARSE_ACTION_PAGER_QUIT, /**< Exit the pager session */
304  UNIX_CLI_PARSE_ACTION_PAGER_NEXT, /**< Scroll to next page */
305  UNIX_CLI_PARSE_ACTION_PAGER_DN, /**< Scroll to next line */
306  UNIX_CLI_PARSE_ACTION_PAGER_UP, /**< Scroll to previous line */
307  UNIX_CLI_PARSE_ACTION_PAGER_TOP, /**< Scroll to first line */
308  UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM, /**< Scroll to last line */
309  UNIX_CLI_PARSE_ACTION_PAGER_PGDN, /**< Scroll to next page */
310  UNIX_CLI_PARSE_ACTION_PAGER_PGUP, /**< Scroll to previous page */
311  UNIX_CLI_PARSE_ACTION_PAGER_REDRAW, /**< Clear and redraw the page on the terminal */
312  UNIX_CLI_PARSE_ACTION_PAGER_SEARCH, /**< Search the pager buffer */
313 
314  UNIX_CLI_PARSE_ACTION_PARTIALMATCH, /**< Action parser found a partial match */
315  UNIX_CLI_PARSE_ACTION_NOMATCH /**< Action parser did not find any match */
317 
318 /** @brief Mapping of input buffer strings to action values.
319  * @note This won't work as a hash since we need to be able to do
320  * partial matches on the string.
321  */
322 typedef struct
323 {
324  u8 *input; /**< Input string to match. */
325  u32 len; /**< Length of input without final NUL. */
326  unix_cli_parse_action_t action; /**< Action to take when matched. */
328 
329 /** @brief Given a capital ASCII letter character return a @c NUL terminated
330  * string with the control code for that letter.
331  *
332  * @param c An ASCII character.
333  * @return A @c NUL terminated string of type @c u8[].
334  *
335  * @par Example
336  * @c CTL('A') returns <code>{ 0x01, 0x00 }</code> as a @c u8[].
337  */
338 #define CTL(c) (u8[]){ (c) - '@', 0 }
339 
340 #define _(a,b) { .input = (u8 *)(a), .len = sizeof(a) - 1, .action = (b) }
341 /**
342  * Patterns to match on a CLI input stream.
343  * @showinitializer
344  */
345 static unix_cli_parse_actions_t unix_cli_parse_strings[] = {
346  /* Line handling */
347  _("\r\n", UNIX_CLI_PARSE_ACTION_CRLF), /* Must be before '\r' */
349  _("\r\0", UNIX_CLI_PARSE_ACTION_CRLF), /* Telnet does this */
351 
352  /* Unix shell control codes */
355  _(CTL ('P'), UNIX_CLI_PARSE_ACTION_UP),
358  _(CTL ('E'), UNIX_CLI_PARSE_ACTION_END),
364  _(ESC "b", UNIX_CLI_PARSE_ACTION_WORDLEFT), /* Alt-B */
365  _(ESC "f", UNIX_CLI_PARSE_ACTION_WORDRIGHT), /* Alt-F */
366  _("\b", UNIX_CLI_PARSE_ACTION_ERASE), /* ^H */
367  _("\x7f", UNIX_CLI_PARSE_ACTION_ERASE), /* Backspace */
368  _("\t", UNIX_CLI_PARSE_ACTION_TAB), /* ^I */
369 
370  /* VT100 Normal mode - Broadest support */
377  _(CSI "3~", UNIX_CLI_PARSE_ACTION_ERASERIGHT), /* Delete */
378  _(CSI "1;5D", UNIX_CLI_PARSE_ACTION_WORDLEFT), /* C-Left */
379  _(CSI "1;5C", UNIX_CLI_PARSE_ACTION_WORDRIGHT), /* C-Right */
380 
381  /* VT100 Application mode - Some Gnome Terminal functions use these */
382  _(ESC "OA", UNIX_CLI_PARSE_ACTION_UP),
388 
389  /* ANSI X3.41-1974 - sent by Microsoft Telnet and PuTTY */
392 
393  /* Emacs-ish history search */
396 
397  /* Other protocol things */
398  _("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC), /* IAC */
399  _("\0", UNIX_CLI_PARSE_ACTION_NOACTION), /* NUL */
401 };
402 
403 /**
404  * Patterns to match when a CLI session is in the pager.
405  * @showinitializer
406  */
407 static unix_cli_parse_actions_t unix_cli_parse_pager[] = {
408  /* Line handling */
409  _("\r\n", UNIX_CLI_PARSE_ACTION_PAGER_CRLF), /* Must be before '\r' */
411  _("\r\0", UNIX_CLI_PARSE_ACTION_PAGER_CRLF), /* Telnet does this */
413 
414  /* Pager commands */
420 
421  /* VT100 */
426 
427  /* VT100 Application mode */
432 
433  /* ANSI X3.41-1974 */
438 
439  /* Other protocol things */
440  _("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC), /* IAC */
441  _("\0", UNIX_CLI_PARSE_ACTION_NOACTION), /* NUL */
443 };
444 
445 #undef _
446 
447 /** CLI session events. */
448 typedef enum
449 {
450  UNIX_CLI_PROCESS_EVENT_READ_READY, /**< A file descriptor has data to be read. */
451  UNIX_CLI_PROCESS_EVENT_QUIT, /**< A CLI session wants to close. */
453 
454 /** CLI global state. */
455 typedef struct
456 {
457  /** Prompt string for CLI. */
459 
460  /** Vec pool of CLI sessions. */
462 
463  /** Vec pool of unused session indices. */
465 
466  /** The session index of the stdin cli */
468 
469  /** File pool index of current input. */
472 
473 /** CLI global state */
475 
476 /**
477  * @brief Search for a byte sequence in the action list.
478  *
479  * Searches the @ref unix_cli_parse_actions_t list in @a a for a match with
480  * the bytes in @a input of maximum length @a ilen bytes.
481  * When a match is made @a *matched indicates how many bytes were matched.
482  * Returns a value from the enum @ref unix_cli_parse_action_t to indicate
483  * whether no match was found, a partial match was found or a complete
484  * match was found and what action, if any, should be taken.
485  *
486  * @param[in] a Actions list to search within.
487  * @param[in] input String fragment to search for.
488  * @param[in] ilen Length of the string in 'input'.
489  * @param[out] matched Pointer to an integer that will contain the number
490  * of bytes matched when a complete match is found.
491  *
492  * @return Action from @ref unix_cli_parse_action_t that the string fragment
493  * matches.
494  * @ref UNIX_CLI_PARSE_ACTION_PARTIALMATCH is returned when the
495  * whole input string matches the start of at least one action.
496  * @ref UNIX_CLI_PARSE_ACTION_NOMATCH is returned when there is no
497  * match at all.
498  */
501  u8 * input, u32 ilen, i32 * matched)
502 {
503  u8 partial = 0;
504 
505  while (a->input)
506  {
507  if (ilen >= a->len)
508  {
509  /* see if the start of the input buffer exactly matches the current
510  * action string. */
511  if (memcmp (input, a->input, a->len) == 0)
512  {
513  *matched = a->len;
514  return a->action;
515  }
516  }
517  else
518  {
519  /* if the first ilen characters match, flag this as a partial -
520  * meaning keep collecting bytes in case of a future match */
521  if (memcmp (input, a->input, ilen) == 0)
522  partial = 1;
523  }
524 
525  /* check next action */
526  a++;
527  }
528 
529  return partial ?
531 }
532 
533 
534 /** Add bytes to the output vector and then flagg the I/O system that bytes
535  * are available to be sent.
536  */
537 static void
539  unix_cli_file_t * cf,
540  u8 * buffer, uword buffer_bytes)
541 {
543 
544  vec_add (cf->output_vector, buffer, buffer_bytes);
545  if (vec_len (cf->output_vector) > 0)
546  {
547  int skip_update = 0 != (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
549  if (!skip_update)
551  }
552 }
553 
554 /** Delete all bytes from the output vector and flag the I/O system
555  * that no more bytes are available to be sent.
556  */
557 static void
559  unix_cli_file_t * cf, uword n_bytes)
560 {
562 
563  vec_delete (cf->output_vector, n_bytes, 0);
564  if (vec_len (cf->output_vector) <= 0)
565  {
566  int skip_update = 0 == (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
568  if (!skip_update)
570  }
571 }
572 
573 /** @brief A bit like strchr with a buffer length limit.
574  * Search a buffer for the first instance of a character up to the limit of
575  * the buffer length. If found then return the position of that character.
576  *
577  * The key departure from strchr is that if the character is not found then
578  * return the buffer length.
579  *
580  * @param chr The byte value to search for.
581  * @param str The buffer in which to search for the value.
582  * @param len The depth into the buffer to search.
583  *
584  * @return The index of the first occurrence of \c chr. If \c chr is not
585  * found then \c len instead.
586  */
589 {
590  word i = 0;
591  for (i = 0; i < len; i++, str++)
592  {
593  if (*str == chr)
594  return i;
595  }
596  return len;
597 }
598 
599 /** @brief Send a buffer to the CLI stream if possible, enqueue it otherwise.
600  * Attempts to write given buffer to the file descriptor of the given
601  * Unix CLI session. If that session already has data in the output buffer
602  * or if the write attempt tells us to try again later then the given buffer
603  * is appended to the pending output buffer instead.
604  *
605  * This is typically called only from \c unix_vlib_cli_output_cooked since
606  * that is where CRLF handling occurs or from places where we explicitly do
607  * not want cooked handling.
608  *
609  * @param cf Unix CLI session of the desired stream to write to.
610  * @param uf The Unix file structure of the desired stream to write to.
611  * @param buffer Pointer to the buffer that needs to be written.
612  * @param buffer_bytes The number of bytes from \c buffer to write.
613  */
614 static void
616  clib_file_t * uf, u8 * buffer, uword buffer_bytes)
617 {
618  int n = 0;
619 
620  if (cf->has_epipe) /* don't try writing anything */
621  return;
622 
623  if (vec_len (cf->output_vector) == 0)
624  {
625  if (cf->is_socket)
626  /* If it's a socket we use MSG_NOSIGNAL to prevent SIGPIPE */
627  n = send (uf->file_descriptor, buffer, buffer_bytes, MSG_NOSIGNAL);
628  else
629  n = write (uf->file_descriptor, buffer, buffer_bytes);
630  }
631 
632  if (n < 0 && errno != EAGAIN)
633  {
634  if (errno == EPIPE)
635  {
636  /* connection closed on us */
637  unix_main_t *um = &unix_main;
638  cf->has_epipe = 1;
641  uf->private_data);
642  }
643  else
644  {
645  clib_unix_warning ("write");
646  }
647  }
648  else if ((word) n < (word) buffer_bytes)
649  {
650  /* We got EAGAIN or we already have stuff in the buffer;
651  * queue up whatever didn't get sent for later. */
652  if (n < 0)
653  n = 0;
654  unix_cli_add_pending_output (uf, cf, buffer + n, buffer_bytes - n);
655  }
656 }
657 
658 /** @brief Process a buffer for CRLF handling before outputting it to the CLI.
659  *
660  * @param cf Unix CLI session of the desired stream to write to.
661  * @param uf The Unix file structure of the desired stream to write to.
662  * @param buffer Pointer to the buffer that needs to be written.
663  * @param buffer_bytes The number of bytes from \c buffer to write.
664  */
665 static void
667  clib_file_t * uf,
668  u8 * buffer, uword buffer_bytes)
669 {
670  word end = 0, start = 0;
671 
672  while (end < buffer_bytes)
673  {
674  if (cf->crlf_mode)
675  {
676  /* iterate the line on \n's so we can insert a \r before it */
677  end = unix_vlib_findchr ('\n',
678  buffer + start,
679  buffer_bytes - start) + start;
680  }
681  else
682  {
683  /* otherwise just send the whole buffer */
684  end = buffer_bytes;
685  }
686 
687  unix_vlib_cli_output_raw (cf, uf, buffer + start, end - start);
688 
689  if (cf->crlf_mode)
690  {
691  if (end < buffer_bytes)
692  {
693  unix_vlib_cli_output_raw (cf, uf, (u8 *) "\r\n", 2);
694  end++; /* skip the \n that we already sent */
695  }
696  start = end;
697  }
698  }
699 
700  /* Use the last character to determine the last direction of the cursor. */
701  if (buffer_bytes > 0)
702  cf->cursor_direction = (buffer[buffer_bytes - 1] == (u8) '\b');
703 }
704 
705 /** @brief Moves the terminal cursor one character to the left, with
706  * special handling when it reaches the left edge of the terminal window.
707  *
708  * Ordinarily we can simply send a '\b' to move the cursor left, however
709  * most terminals will not reverse-wrap to the end of the previous line
710  * if the cursor is in the left-most column. To counter this we must
711  * check the cursor position + prompt length modulo terminal width and
712  * if available use some other means, such as ANSI terminal escape
713  * sequences, to move the cursor.
714  *
715  * @param cf Unix CLI session of the desired stream to write to.
716  * @param uf The Unix file structure of the desired stream to write to.
717  */
718 static void
720 {
722  static u8 *ansi = 0; /* assumes no reentry */
723  u32 position;
724 
725  if (!cf->is_interactive || !cf->ansi_capable || !cf->width)
726  {
727  /* No special handling for dumb terminals */
728  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
729  return;
730  }
731 
732  position = ((u32) vec_len (cm->cli_prompt) + cf->cursor) % cf->width;
733 
734  if (position != 0)
735  {
736  /* No special handling required if we're not at the left edge */
737  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
738  return;
739  }
740 
741  if (!cf->cursor_direction)
742  {
743  /* Special handling for when we are at the left edge but
744  * the cursor was going left-to-right, but in this situation
745  * xterm-like terminals actually hide the cursor off the right
746  * edge. A \b here seems to jump one char too many, so let's
747  * force the cursor onto the next line instead.
748  */
749  if (cf->cursor < vec_len (cf->current_command))
751  1);
752  else
753  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
754  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
755  }
756 
757  /* Relocate the cursor at the right hand edge one line above */
758  ansi = format (ansi, CSI "A" CSI "%dC", cf->width - 1);
759  unix_vlib_cli_output_cooked (cf, uf, ansi, vec_len (ansi));
760  vec_reset_length (ansi); /* keep the vec around for next time */
761  cf->cursor_direction = 1; /* going backwards now */
762 }
763 
764 /** @brief Output the CLI prompt */
765 static void
767 {
769 
770  if (cf->is_interactive) /* Only interactive sessions get a prompt */
772  vec_len (cm->cli_prompt));
773 }
774 
775 /** @brief Output a pager prompt and show number of buffered lines */
776 static void
778 {
779  u8 *prompt;
780  u32 h;
781 
782  h = cf->pager_start + (cf->height - 1);
783  if (h > vec_len (cf->pager_index))
784  h = vec_len (cf->pager_index);
785 
786  prompt = format (0, "\r%s-- more -- (%d-%d/%d)%s",
787  cf->ansi_capable ? ANSI_BOLD : "",
788  cf->pager_start + 1,
789  h,
790  vec_len (cf->pager_index),
791  cf->ansi_capable ? ANSI_RESET : "");
792 
793  unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));
794 
795  vec_free (prompt);
796 }
797 
798 /** @brief Output a pager "skipping" message */
799 static void
801  char *message, char *postfix)
802 {
803  u8 *prompt;
804 
805  prompt = format (0, "\r%s-- %s --%s%s",
806  cf->ansi_capable ? ANSI_BOLD : "",
807  message, cf->ansi_capable ? ANSI_RESET : "", postfix);
808 
809  unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));
810 
811  vec_free (prompt);
812 }
813 
814 /** @brief Erase the printed pager prompt */
815 static void
817 {
818  if (cf->ansi_capable)
819  {
820  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
822  (u8 *) ANSI_CLEARLINE,
823  sizeof (ANSI_CLEARLINE) - 1);
824  }
825  else
826  {
827  int i;
828 
829  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
830  for (i = 0; i < cf->width - 1; i++)
831  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
832  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
833  }
834 }
835 
836 /** @brief Uses an ANSI escape sequence to move the cursor */
837 static void
839 {
840  u8 *str;
841 
842  str = format (0, "%s%d;%dH", CSI, y, x);
843 
844  unix_vlib_cli_output_cooked (cf, uf, str, vec_len (str));
845 
846  vec_free (str);
847 }
848 
849 /** Redraw the currently displayed page of text.
850  * @param cf CLI session to redraw the pager buffer of.
851  * @param uf Unix file of the CLI session.
852  */
853 static void
855 {
857  u8 *line = NULL;
858  word i;
859 
860  /* No active pager? Do nothing. */
861  if (!vec_len (cf->pager_index))
862  return;
863 
864  if (cf->ansi_capable)
865  {
866  /* If we have ANSI, send the clear screen sequence */
868  (u8 *) ANSI_CLEAR,
869  sizeof (ANSI_CLEAR) - 1);
870  }
871  else
872  {
873  /* Otherwise make sure we're on a blank line */
875  }
876 
877  /* (Re-)send the current page of content */
878  for (i = 0; i < cf->height - 1 &&
879  i + cf->pager_start < vec_len (cf->pager_index); i++)
880  {
881  pi = &cf->pager_index[cf->pager_start + i];
882  line = cf->pager_vector[pi->line] + pi->offset;
883 
884  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
885  }
886  /* if the last line didn't end in newline, add a newline */
887  if (pi && line[pi->length - 1] != '\n')
888  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
889 
890  unix_cli_pager_prompt (cf, uf);
891 }
892 
893 /** @brief Process and add a line to the pager index.
894  * In normal operation this function will take the given character string
895  * found in @c line and with length @c len_or_index and iterates the over the
896  * contents, adding each line of text discovered within it to the
897  * pager index. Lines are identified by newlines ("<code>\\n</code>") and by
898  * strings longer than the width of the terminal.
899  *
900  * If instead @c line is @c NULL then @c len_or_index is taken to mean the
901  * index of an existing line in the pager buffer; this simply means that the
902  * input line does not need to be cloned since we already have it. This is
903  * typical if we are reindexing the pager buffer.
904  *
905  * @param cf The CLI session whose pager we are adding to.
906  * @param line The string of text to be indexed into the pager buffer.
907  * If @c line is @c NULL then the mode of operation
908  * changes slightly; see the description above.
909  * @param len_or_index If @c line is a pointer to a string then this parameter
910  * indicates the length of that string; Otherwise this
911  * value provides the index in the pager buffer of an
912  * existing string to be indexed.
913  */
914 static void
915 unix_cli_pager_add_line (unix_cli_file_t * cf, u8 * line, word len_or_index)
916 {
917  u8 *p = NULL;
918  word i, j, k;
919  word line_index, len;
920  u32 width = cf->width;
922 
923  if (line == NULL)
924  {
925  /* Use a line already in the pager buffer */
926  line_index = len_or_index;
927  if (cf->pager_vector != NULL)
928  p = cf->pager_vector[line_index];
929  len = vec_len (p);
930  }
931  else
932  {
933  len = len_or_index;
934  /* Add a copy of the raw string to the pager buffer */
935  p = vec_new (u8, len);
936  clib_memcpy (p, line, len);
937 
938  /* store in pager buffer */
939  line_index = vec_len (cf->pager_vector);
940  vec_add1 (cf->pager_vector, p);
941  }
942 
943  i = 0;
944  while (i < len)
945  {
946  /* Find the next line, or run to terminal width, or run to EOL */
947  int l = len - i;
948  j = unix_vlib_findchr ((u8) '\n', p, l < width ? l : width);
949 
950  if (j < l && p[j] == '\n') /* incl \n */
951  j++;
952 
953  /* Add the line to the index */
954  k = vec_len (cf->pager_index);
955  vec_validate (cf->pager_index, k);
956  pi = &cf->pager_index[k];
957 
958  pi->line = line_index;
959  pi->offset = i;
960  pi->length = j;
961 
962  i += j;
963  p += j;
964  }
965 }
966 
967 /** @brief Reindex entire pager buffer.
968  * Resets the current pager index and then re-adds the lines in the pager
969  * buffer to the index.
970  *
971  * Additionally this function attempts to retain the current page start
972  * line offset by searching for the same top-of-screen line in the new index.
973  *
974  * @param cf The CLI session whose pager buffer should be reindexed.
975  */
976 static void
978 {
979  word i, old_line, old_offset;
981 
982  /* If there is nothing in the pager buffer then make sure the index
983  * is empty and move on.
984  */
985  if (cf->pager_vector == 0)
986  {
988  return;
989  }
990 
991  /* Retain a pointer to the current page start line so we can
992  * find it later
993  */
994  pi = &cf->pager_index[cf->pager_start];
995  old_line = pi->line;
996  old_offset = pi->offset;
997 
998  /* Re-add the buffered lines to the index */
1001  {
1002  unix_cli_pager_add_line (cf, NULL, i);
1003  }
1004 
1005  /* Attempt to re-locate the previously stored page start line */
1007  {
1008  pi = &cf->pager_index[i];
1009 
1010  if (pi->line == old_line &&
1011  (pi->offset <= old_offset || pi->offset + pi->length > old_offset))
1012  {
1013  /* Found it! */
1014  cf->pager_start = i;
1015  break;
1016  }
1017  }
1018 
1019  /* In case the start line was not found (rare), ensure the pager start
1020  * index is within bounds
1021  */
1022  if (cf->pager_start >= vec_len (cf->pager_index))
1023  {
1024  if (!cf->height || vec_len (cf->pager_index) < (cf->height - 1))
1025  cf->pager_start = 0;
1026  else
1027  cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
1028  }
1029 }
1030 
1031 /** VLIB CLI output function.
1032  *
1033  * If the terminal has a pager configured then this function takes care
1034  * of collating output into the pager buffer; ensuring only the first page
1035  * is displayed and any lines in excess of the first page are buffered.
1036  *
1037  * If the maximum number of index lines in the buffer is exceeded then the
1038  * pager is cancelled and the contents of the current buffer are sent to the
1039  * terminal.
1040  *
1041  * If there is no pager configured then the output is sent directly to the
1042  * terminal.
1043  *
1044  * @param cli_file_index Index of the CLI session where this output is
1045  * directed.
1046  * @param buffer String of printabe bytes to be output.
1047  * @param buffer_bytes The number of bytes in @c buffer to be output.
1048  */
1049 static void
1050 unix_vlib_cli_output (uword cli_file_index, u8 * buffer, uword buffer_bytes)
1051 {
1052  unix_main_t *um = &unix_main;
1055  unix_cli_file_t *cf;
1056  clib_file_t *uf;
1057 
1058  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
1060 
1061  if (cf->no_pager || um->cli_pager_buffer_limit == 0 || cf->height == 0)
1062  {
1063  unix_vlib_cli_output_cooked (cf, uf, buffer, buffer_bytes);
1064  }
1065  else
1066  {
1067  word row = vec_len (cf->pager_index);
1068  u8 *line;
1070 
1071  /* Index and add the output lines to the pager buffer. */
1072  unix_cli_pager_add_line (cf, buffer, buffer_bytes);
1073 
1074  /* Now iterate what was added to display the lines.
1075  * If we reach the bottom of the page, display a prompt.
1076  */
1077  while (row < vec_len (cf->pager_index))
1078  {
1079  if (row < cf->height - 1)
1080  {
1081  /* output this line */
1082  pi = &cf->pager_index[row];
1083  line = cf->pager_vector[pi->line] + pi->offset;
1084  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
1085 
1086  /* if the last line didn't end in newline, and we're at the
1087  * bottom of the page, add a newline */
1088  if (line[pi->length - 1] != '\n' && row == cf->height - 2)
1089  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1090  }
1091  else
1092  {
1093  /* Display the pager prompt every 10 lines */
1094  if (!(row % 10))
1095  unix_cli_pager_prompt (cf, uf);
1096  }
1097  row++;
1098  }
1099 
1100  /* Check if we went over the pager buffer limit */
1101  if (vec_len (cf->pager_index) > um->cli_pager_buffer_limit)
1102  {
1103  /* Stop using the pager for the remainder of this CLI command */
1104  cf->no_pager = 2;
1105 
1106  /* If we likely printed the prompt, erase it */
1107  if (vec_len (cf->pager_index) > cf->height - 1)
1108  unix_cli_pager_prompt_erase (cf, uf);
1109 
1110  /* Dump out the contents of the buffer */
1111  for (row = cf->pager_start + (cf->height - 1);
1112  row < vec_len (cf->pager_index); row++)
1113  {
1114  pi = &cf->pager_index[row];
1115  line = cf->pager_vector[pi->line] + pi->offset;
1116  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
1117  }
1118 
1119  unix_cli_pager_reset (cf);
1120  }
1121  }
1122 }
1123 
1124 /** Identify whether a terminal type is ANSI capable.
1125  *
1126  * Compares the string given in @c term with a list of terminal types known
1127  * to support ANSI escape sequences.
1128  *
1129  * This list contains, for example, @c xterm, @c screen and @c ansi.
1130  *
1131  * @param term A string with a terminal type in it.
1132  * @param len The length of the string in @c term.
1133  *
1134  * @return @c 1 if the terminal type is recognized as supporting ANSI
1135  * terminal sequences; @c 0 otherwise.
1136  */
1137 static u8
1139 {
1140  /* This may later be better done as a hash of some sort. */
1141 #define _(a) do { \
1142  if (strncasecmp(a, (char *)term, (size_t)len) == 0) return 1; \
1143  } while(0)
1144 
1145  _("xterm");
1146  _("xterm-color");
1147  _("xterm-256color"); /* iTerm on Mac */
1148  _("screen");
1149  _("screen-256color"); /* Screen and tmux */
1150  _("ansi"); /* Microsoft Telnet */
1151 #undef _
1152 
1153  return 0;
1154 }
1155 
1156 /** Identify whether a terminal type is non-interactive.
1157  *
1158  * Compares the string given in @c term with a list of terminal types known
1159  * to be non-interactive, as send by tools such as @c vppctl .
1160  *
1161  * This list contains, for example, @c vppctl.
1162  *
1163  * @param term A string with a terminal type in it.
1164  * @param len The length of the string in @c term.
1165  *
1166  * @return @c 1 if the terminal type is recognized as being non-interactive;
1167  * @c 0 otherwise.
1168  */
1169 static u8
1171 {
1172  /* This may later be better done as a hash of some sort. */
1173 #define _(a) do { \
1174  if (strncasecmp(a, (char *)term, (size_t)len) == 0) return 1; \
1175  } while(0)
1176 
1177  _("vppctl");
1178 #undef _
1179 
1180  return 0;
1181 }
1182 
1183 /** Set a session to be non-interactive. */
1184 static void
1186 {
1187  /* Non-interactive sessions don't get these */
1188  cf->is_interactive = 0;
1189  cf->no_pager = 1;
1190  cf->history_limit = 0;
1191  cf->has_history = 0;
1192  cf->line_mode = 1;
1193 }
1194 
1195 /** @brief Emit initial welcome banner and prompt on a connection. */
1196 static void
1198 {
1199  unix_main_t *um = &unix_main;
1202  unix_cli_banner_t *banner;
1203  int i, len;
1204 
1205  /* Mark the session as started if we get here */
1206  cf->started = 1;
1207 
1208  if (!(cf->is_interactive)) /* No banner for non-interactive sessions */
1209  return;
1210 
1211  /*
1212  * Put the first bytes directly into the buffer so that further output is
1213  * queued until everything is ready. (oterwise initial prompt can appear
1214  * mid way through VPP initialization)
1215  */
1216  unix_cli_add_pending_output (uf, cf, (u8 *) "\r", 1);
1217 
1218  if (!um->cli_no_banner)
1219  {
1220  if (cf->ansi_capable)
1221  {
1222  banner = unix_cli_banner_color;
1223  len = ARRAY_LEN (unix_cli_banner_color);
1224  }
1225  else
1226  {
1227  banner = unix_cli_banner;
1228  len = ARRAY_LEN (unix_cli_banner);
1229  }
1230 
1231  for (i = 0; i < len; i++)
1232  {
1234  banner[i].line, banner[i].length);
1235  }
1236  }
1237 
1238  /* Prompt. */
1239  unix_cli_cli_prompt (cf, uf);
1240 
1241 }
1242 
1243 /** @brief A failsafe triggered on a timer to ensure we send the prompt
1244  * to telnet sessions that fail to negotiate the terminal type. */
1245 static void
1247 {
1249  unix_cli_file_t *cf;
1250  (void) delay;
1251 
1252  /* Check the connection didn't close already */
1253  if (pool_is_free_index (cm->cli_file_pool, (uword) arg))
1254  return;
1255 
1256  cf = pool_elt_at_index (cm->cli_file_pool, (uword) arg);
1257 
1258  if (!cf->started)
1259  unix_cli_file_welcome (cm, cf);
1260 }
1261 
1262 /** @brief A mostly no-op Telnet state machine.
1263  * Process Telnet command bytes in a way that ensures we're mostly
1264  * transparent to the Telnet protocol. That is, it's mostly a no-op.
1265  *
1266  * @return -1 if we need more bytes, otherwise a positive integer number of
1267  * bytes to consume from the input_vector, not including the initial
1268  * IAC byte.
1269  */
1270 static i32
1272  unix_cli_file_t * cf,
1273  clib_file_t * uf, u8 * input_vector, uword len)
1274 {
1275  /* Input_vector starts at IAC byte.
1276  * See if we have a complete message; if not, return -1 so we wait for more.
1277  * if we have a complete message, consume those bytes from the vector.
1278  */
1279  i32 consume = 0;
1280 
1281  if (len == 1)
1282  return -1; /* want more bytes */
1283 
1284  switch (input_vector[1])
1285  {
1286  case IAC:
1287  /* two IAC's in a row means to pass through 0xff.
1288  * since that makes no sense here, just consume it.
1289  */
1290  consume = 1;
1291  break;
1292 
1293  case WILL:
1294  case WONT:
1295  case DO:
1296  case DONT:
1297  /* Expect 3 bytes */
1298  if (len < 3)
1299  return -1; /* want more bytes */
1300 
1301  consume = 2;
1302  break;
1303 
1304  case SB:
1305  {
1306  /* Sub option - search ahead for IAC SE to end it */
1307  i32 i;
1308  for (i = 3; i < len && i < UNIX_CLI_MAX_DEPTH_TELNET; i++)
1309  {
1310  if (input_vector[i - 1] == IAC && input_vector[i] == SE)
1311  {
1312  /* We have a complete message; see if we care about it */
1313  switch (input_vector[2])
1314  {
1315  case TELOPT_TTYPE:
1316  if (input_vector[3] != 0)
1317  break;
1318  {
1319  /* See if the the terminal type is recognized */
1320  u8 *term = input_vector + 4;
1321  uword len = i - 5;
1322 
1323  /* See if the terminal type is ANSI capable */
1324  cf->ansi_capable =
1325  unix_cli_terminal_type_ansi (term, len);
1326 
1327  /* See if the terminal type indicates non-interactive */
1328  if (unix_cli_terminal_type_noninteractive (term, len))
1330  }
1331 
1332  /* If session not started, we can release the pause */
1333  if (!cf->started)
1334  /* Send the welcome banner and initial prompt */
1335  unix_cli_file_welcome (&unix_cli_main, cf);
1336  break;
1337 
1338  case TELOPT_NAWS:
1339  /* Window size */
1340  if (i != 8) /* check message is correct size */
1341  break;
1342 
1343  cf->width =
1344  clib_net_to_host_u16 (*((u16 *) (input_vector + 3)));
1347  if (cf->width == 0)
1349 
1350  cf->height =
1351  clib_net_to_host_u16 (*((u16 *) (input_vector + 5)));
1354  if (cf->height == 0)
1356 
1357  /* reindex pager buffer */
1359  /* redraw page */
1360  unix_cli_pager_redraw (cf, uf);
1361  break;
1362 
1363  default:
1364  break;
1365  }
1366  /* Consume it all */
1367  consume = i;
1368  break;
1369  }
1370  }
1371 
1372  if (i == UNIX_CLI_MAX_DEPTH_TELNET)
1373  consume = 1; /* hit max search depth, advance one byte */
1374 
1375  if (consume == 0)
1376  return -1; /* want more bytes */
1377 
1378  break;
1379  }
1380 
1381  case GA:
1382  case EL:
1383  case EC:
1384  case AO:
1385  case IP:
1386  case BREAK:
1387  case DM:
1388  case NOP:
1389  case SE:
1390  case EOR:
1391  case ABORT:
1392  case SUSP:
1393  case xEOF:
1394  /* Simple one-byte messages */
1395  consume = 1;
1396  break;
1397 
1398  case AYT:
1399  /* Are You There - trigger a visible response */
1400  consume = 1;
1401  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "fd.io VPP\n", 10);
1402  break;
1403 
1404  default:
1405  /* Unknown command! Eat the IAC byte */
1406  break;
1407  }
1408 
1409  return consume;
1410 }
1411 
1412 /** @brief Process actionable input.
1413  * Based on the \c action process the input; this typically involves
1414  * searching the command history or editing the current command line.
1415  */
1416 static int
1418  unix_main_t * um,
1419  unix_cli_file_t * cf,
1420  clib_file_t * uf,
1421  u8 input, unix_cli_parse_action_t action)
1422 {
1423  u8 *prev;
1424  u8 *save = 0;
1425  u8 **possible_commands;
1426  int j, delta;
1427 
1428  switch (action)
1429  {
1431  break;
1432 
1435  if (!cf->has_history || !cf->history_limit)
1436  break;
1437  if (cf->search_mode == 0)
1438  {
1439  /* Erase the current command (if any) */
1440  for (; cf->cursor > 0; cf->cursor--)
1441  {
1443  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1445  }
1446 
1449 
1450  if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
1451  cf->search_mode = -1;
1452  else
1453  cf->search_mode = 1;
1454  }
1455  else
1456  {
1457  if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
1458  cf->search_mode = -1;
1459  else
1460  cf->search_mode = 1;
1461 
1462  cf->excursion += cf->search_mode;
1463  goto search_again;
1464  }
1465  break;
1466 
1468  /* Erase the command from the cursor to the start */
1469 
1470  j = cf->cursor;
1471  /* Shimmy backwards to the new end of line position */
1472  delta = vec_len (cf->current_command) - cf->cursor;
1473  for (; cf->cursor > delta; cf->cursor--)
1475  /* Zap from here to the end of what is currently displayed */
1476  for (; cf->cursor < vec_len (cf->current_command); cf->cursor++)
1477  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1478  /* Get back to the start of the line */
1479  for (; cf->cursor > 0; cf->cursor--)
1481 
1482  /* Delete the desired text from the command */
1483  memmove (cf->current_command, cf->current_command + j, delta);
1484  _vec_len (cf->current_command) = delta;
1485 
1486  /* Print the new contents */
1487  unix_vlib_cli_output_cooked (cf, uf, cf->current_command, delta);
1488  cf->cursor = delta; /* for backspace tracking */
1489 
1490  /* Shimmy back to the start */
1491  for (; cf->cursor > 0; cf->cursor--)
1493 
1494  cf->search_mode = 0;
1495  break;
1496 
1498  /* Erase the command from the cursor to the end */
1499 
1500  j = cf->cursor;
1501  /* Zap from cursor to end of what is currently displayed */
1502  for (; cf->cursor < (vec_len (cf->current_command)); cf->cursor++)
1503  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1504  /* Get back to where we were */
1505  for (; cf->cursor > j; cf->cursor--)
1507 
1508  /* Truncate the line at the cursor */
1509  _vec_len (cf->current_command) = cf->cursor;
1510 
1511  cf->search_mode = 0;
1512  break;
1513 
1515  if (cf->cursor > 0)
1516  {
1518  cf->cursor--;
1519  }
1520 
1521  cf->search_mode = 0;
1522  break;
1523 
1525  if (cf->cursor < vec_len (cf->current_command))
1526  {
1527  /* have to emit the character under the cursor */
1529  cf->current_command + cf->cursor, 1);
1530  cf->cursor++;
1531  }
1532 
1533  cf->search_mode = 0;
1534  break;
1535 
1538  if (!cf->has_history || !cf->history_limit)
1539  break;
1540  cf->search_mode = 0;
1541  /* Erase the command */
1542  for (; cf->cursor < vec_len (cf->current_command); cf->cursor++)
1543  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1544  for (; cf->cursor > 0; cf->cursor--)
1545  {
1547  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1549  }
1551  if (vec_len (cf->command_history))
1552  {
1553  if (action == UNIX_CLI_PARSE_ACTION_UP)
1554  delta = -1;
1555  else
1556  delta = 1;
1557 
1558  cf->excursion += delta;
1559 
1560  if (cf->excursion == vec_len (cf->command_history))
1561  {
1562  /* down-arrowed to last entry - want a blank line */
1563  _vec_len (cf->current_command) = 0;
1564  }
1565  else if (cf->excursion < 0)
1566  {
1567  /* up-arrowed over the start to the end, want a blank line */
1568  cf->excursion = vec_len (cf->command_history);
1569  _vec_len (cf->current_command) = 0;
1570  }
1571  else
1572  {
1573  if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
1574  /* down-arrowed past end - wrap to start */
1575  cf->excursion = 0;
1576 
1577  /* Print the command at the current position */
1578  prev = cf->command_history[cf->excursion];
1579  vec_validate (cf->current_command, vec_len (prev) - 1);
1580 
1581  clib_memcpy (cf->current_command, prev, vec_len (prev));
1582  _vec_len (cf->current_command) = vec_len (prev);
1584  vec_len (cf->current_command));
1585  }
1586  }
1587  cf->cursor = vec_len (cf->current_command);
1588  break;
1589 
1591  if (vec_len (cf->current_command) && cf->cursor > 0)
1592  {
1593  for (; cf->cursor > 0; cf->cursor--)
1595  }
1596 
1597  cf->search_mode = 0;
1598  break;
1599 
1601  if (vec_len (cf->current_command) &&
1602  cf->cursor < vec_len (cf->current_command))
1603  {
1605  cf->current_command + cf->cursor,
1606  vec_len (cf->current_command) -
1607  cf->cursor);
1608  cf->cursor = vec_len (cf->current_command);
1609  }
1610 
1611  cf->search_mode = 0;
1612  break;
1613 
1615  if (vec_len (cf->current_command) && cf->cursor > 0)
1616  {
1618  cf->cursor--;
1619 
1620  while (cf->cursor && isspace (cf->current_command[cf->cursor]))
1621  {
1623  cf->cursor--;
1624  }
1625  while (cf->cursor && !isspace (cf->current_command[cf->cursor]))
1626  {
1627  if (isspace (cf->current_command[cf->cursor - 1]))
1628  break;
1630  cf->cursor--;
1631  }
1632 
1633  }
1634 
1635  cf->search_mode = 0;
1636  break;
1637 
1639  if (vec_len (cf->current_command) &&
1640  cf->cursor < vec_len (cf->current_command))
1641  {
1642  int e = vec_len (cf->current_command);
1643  j = cf->cursor;
1644  while (j < e && !isspace (cf->current_command[j]))
1645  j++;
1646  while (j < e && isspace (cf->current_command[j]))
1647  j++;
1649  cf->current_command + cf->cursor,
1650  j - cf->cursor);
1651  cf->cursor = j;
1652  }
1653 
1654  cf->search_mode = 0;
1655  break;
1656 
1657 
1659  if (vec_len (cf->current_command))
1660  {
1661  if (cf->cursor == vec_len (cf->current_command))
1662  {
1664  cf->cursor--;
1665  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1666  cf->cursor++;
1668  cf->cursor--;
1669  _vec_len (cf->current_command)--;
1670  }
1671  else if (cf->cursor > 0)
1672  {
1673  /* shift everything at & to the right of the cursor left by 1 */
1674  j = vec_len (cf->current_command) - cf->cursor;
1675  memmove (cf->current_command + cf->cursor - 1,
1676  cf->current_command + cf->cursor, j);
1677  _vec_len (cf->current_command)--;
1678 
1679  /* redraw the rest of the line */
1681  cf->cursor--;
1683  cf->current_command + cf->cursor,
1684  j);
1685  cf->cursor += j;
1686  /* erase last char */
1687  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1688  cf->cursor++;
1689 
1690  /* and shift the terminal cursor back where it should be */
1691  j += 2; /* account for old string length and offset position */
1692  while (--j)
1693  {
1695  cf->cursor--;
1696  }
1697  }
1698  }
1699  cf->search_mode = 0;
1700  cf->excursion = 0;
1702  break;
1703 
1705  if (vec_len (cf->current_command))
1706  {
1707  if (cf->cursor < vec_len (cf->current_command))
1708  {
1709  /* shift everything to the right of the cursor left by 1 */
1710  j = vec_len (cf->current_command) - cf->cursor - 1;
1711  memmove (cf->current_command + cf->cursor,
1712  cf->current_command + cf->cursor + 1, j);
1713  _vec_len (cf->current_command)--;
1714  /* redraw the rest of the line */
1716  cf->current_command + cf->cursor,
1717  j);
1718  cf->cursor += j;
1719  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1720  cf->cursor++;
1722  cf->cursor--;
1723  /* and shift the terminal cursor back where it should be */
1724  if (j)
1725  {
1727  cf->cursor--;
1728  while (--j)
1729  {
1731  cf->cursor--;
1732  }
1733  }
1734  }
1735  }
1736  else if (input == 'D' - '@')
1737  {
1738  /* ^D with no command entered = quit */
1739  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "quit\n", 5);
1743  cf - cm->cli_file_pool);
1744  }
1745  cf->search_mode = 0;
1746  cf->excursion = 0;
1748  break;
1749 
1751  /* If we're in ANSI mode, clear the screen.
1752  * Then redraw the prompt and any existing command input, then put
1753  * the cursor back where it was in that line.
1754  */
1755  if (cf->ansi_capable)
1757  (u8 *) ANSI_CLEAR,
1758  sizeof (ANSI_CLEAR) - 1);
1759  else
1760  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1761 
1762  unix_vlib_cli_output_raw (cf, uf,
1763  cm->cli_prompt, vec_len (cm->cli_prompt));
1765  cf->current_command,
1766  vec_len (cf->current_command));
1767  j = cf->cursor;
1768  cf->cursor = vec_len (cf->current_command);
1769  for (; cf->cursor > j; cf->cursor--)
1771 
1772  break;
1773 
1775  if (cf->cursor < vec_len (cf->current_command))
1776  {
1777  /* if we are in the middle of a line, complete only if
1778  * the cursor points to whitespace */
1779  if (isspace (cf->current_command[cf->cursor]))
1780  {
1781  /* save and clear any input that is after the cursor */
1782  vec_resize (save, vec_len (cf->current_command) - cf->cursor);
1783  clib_memcpy (save, cf->current_command + cf->cursor,
1784  vec_len (cf->current_command) - cf->cursor);
1785  _vec_len (cf->current_command) = cf->cursor;
1786  }
1787  else
1788  {
1789  unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
1790  break;
1791  }
1792  }
1793  possible_commands =
1795  if (vec_len (possible_commands) == 1)
1796  {
1797  u8 *completed = possible_commands[0];
1798  j = cf->cursor;
1799 
1800  /* find the last word of current_command */
1801  while (j >= 1 && !isspace (cf->current_command[j - 1]))
1802  {
1804  cf->cursor--;
1805  j--;
1806  }
1807  _vec_len (cf->current_command) = j;
1808 
1809  /* replace it with the newly expanded command */
1810  vec_append (cf->current_command, completed);
1811 
1812  /* echo to the terminal */
1813  unix_vlib_cli_output_cooked (cf, uf, completed,
1814  vec_len (completed));
1815 
1816  /* add one trailing space if needed */
1817  if (vec_len (save) == 0)
1818  {
1819  vec_add1 (cf->current_command, ' ');
1820  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1821  }
1822 
1823  cf->cursor = vec_len (cf->current_command);
1824 
1825  }
1826  else if (vec_len (possible_commands) >= 2)
1827  {
1828  u8 **possible_command;
1829  uword max_command_len = 0, min_command_len = ~0;
1830  u32 i;
1831 
1832  vec_foreach (possible_command, possible_commands)
1833  {
1834  if (vec_len (*possible_command) > max_command_len)
1835  max_command_len = vec_len (*possible_command);
1836  if (vec_len (*possible_command) < min_command_len)
1837  min_command_len = vec_len (*possible_command);
1838  }
1839 
1840  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1841 
1842  i = 0;
1843  vec_foreach (possible_command, possible_commands)
1844  {
1845  if (i + max_command_len >= cf->width)
1846  {
1847  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1848  i = 0;
1849  }
1850  unix_vlib_cli_output_cooked (cf, uf, *possible_command,
1851  vec_len (*possible_command));
1852  for (j = vec_len (*possible_command); j < max_command_len + 2;
1853  j++)
1854  {
1855  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
1856  }
1857  i += max_command_len + 2;
1858  }
1859 
1860  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1861 
1862  /* rewrite prompt */
1863  unix_cli_cli_prompt (cf, uf);
1865  vec_len (cf->current_command));
1866 
1867  /* count length of last word */
1868  j = cf->cursor;
1869  i = 0;
1870  while (j >= 1 && !isspace (cf->current_command[j - 1]))
1871  {
1872  j--;
1873  i++;
1874  }
1875 
1876  /* determine smallest common command */
1877  for (; i < min_command_len; i++)
1878  {
1879  u8 common = '\0';
1880  int stop = 0;
1881 
1882  vec_foreach (possible_command, possible_commands)
1883  {
1884  if (common == '\0')
1885  {
1886  common = (*possible_command)[i];
1887  }
1888  else if (common != (*possible_command)[i])
1889  {
1890  stop = 1;
1891  break;
1892  }
1893  }
1894 
1895  if (!stop)
1896  {
1897  vec_add1 (cf->current_command, common);
1898  cf->cursor++;
1899  unix_vlib_cli_output_cooked (cf, uf, (u8 *) & common, 1);
1900  }
1901  else
1902  {
1903  break;
1904  }
1905  }
1906  }
1907  else
1908  {
1909  unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
1910  }
1911 
1912  if (vec_len (save) > 0)
1913  {
1914  /* restore remaining input if tab was hit in the middle of a line */
1915  unix_vlib_cli_output_cooked (cf, uf, save, vec_len (save));
1916  cf->cursor += vec_len (save);
1917  for (j = 0; j < vec_len (save); j++, cf->cursor--)
1919  vec_append (cf->current_command, save);
1920  vec_free (save);
1921  }
1922  vec_free (possible_commands);
1923 
1924  break;
1926  /* TODO */
1927  break;
1928 
1929 
1931  pager_quit:
1932  unix_cli_pager_prompt_erase (cf, uf);
1933  unix_cli_pager_reset (cf);
1934  unix_cli_cli_prompt (cf, uf);
1935  break;
1936 
1939  /* show next page of the buffer */
1940  if (cf->height + cf->pager_start <= vec_len (cf->pager_index))
1941  {
1942  u8 *line = NULL;
1944 
1945  int m = cf->pager_start + (cf->height - 1);
1946  unix_cli_pager_prompt_erase (cf, uf);
1947  for (j = m;
1948  j < vec_len (cf->pager_index) && cf->pager_start < m;
1949  j++, cf->pager_start++)
1950  {
1951  pi = &cf->pager_index[j];
1952  line = cf->pager_vector[pi->line] + pi->offset;
1953  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
1954  }
1955  /* if the last line didn't end in newline, add a newline */
1956  if (pi && line[pi->length - 1] != '\n')
1957  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1958  unix_cli_pager_prompt (cf, uf);
1959  }
1960  else
1961  {
1962  if (action == UNIX_CLI_PARSE_ACTION_PAGER_NEXT)
1963  /* no more in buffer, exit, but only if it was <space> */
1964  goto pager_quit;
1965  }
1966  break;
1967 
1970  /* display the next line of the buffer */
1971  if (cf->height + cf->pager_start <= vec_len (cf->pager_index))
1972  {
1973  u8 *line;
1975 
1976  unix_cli_pager_prompt_erase (cf, uf);
1977  pi = &cf->pager_index[cf->pager_start + (cf->height - 1)];
1978  line = cf->pager_vector[pi->line] + pi->offset;
1979  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
1980  cf->pager_start++;
1981  /* if the last line didn't end in newline, add a newline */
1982  if (line[pi->length - 1] != '\n')
1983  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
1984  unix_cli_pager_prompt (cf, uf);
1985  }
1986  else
1987  {
1988  if (action == UNIX_CLI_PARSE_ACTION_PAGER_CRLF)
1989  /* no more in buffer, exit, but only if it was <enter> */
1990  goto pager_quit;
1991  }
1992 
1993  break;
1994 
1996  /* scroll the page back one line */
1997  if (cf->pager_start > 0)
1998  {
1999  u8 *line = NULL;
2001 
2002  cf->pager_start--;
2003  if (cf->ansi_capable)
2004  {
2005  pi = &cf->pager_index[cf->pager_start];
2006  line = cf->pager_vector[pi->line] + pi->offset;
2007  unix_cli_pager_prompt_erase (cf, uf);
2009  sizeof (ANSI_SCROLLDN) - 1);
2011  sizeof (ANSI_SAVECURSOR) - 1);
2012  unix_cli_ansi_cursor (cf, uf, 1, 1);
2014  sizeof (ANSI_CLEARLINE) - 1);
2015  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
2017  sizeof (ANSI_RESTCURSOR) - 1);
2018  unix_cli_pager_prompt_erase (cf, uf);
2019  unix_cli_pager_prompt (cf, uf);
2020  }
2021  else
2022  {
2023  int m = cf->pager_start + (cf->height - 1);
2024  unix_cli_pager_prompt_erase (cf, uf);
2025  for (j = cf->pager_start;
2026  j < vec_len (cf->pager_index) && j < m; j++)
2027  {
2028  pi = &cf->pager_index[j];
2029  line = cf->pager_vector[pi->line] + pi->offset;
2030  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
2031  }
2032  /* if the last line didn't end in newline, add a newline */
2033  if (pi && line[pi->length - 1] != '\n')
2034  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
2035  unix_cli_pager_prompt (cf, uf);
2036  }
2037  }
2038  break;
2039 
2041  /* back to the first page of the buffer */
2042  if (cf->pager_start > 0)
2043  {
2044  u8 *line = NULL;
2046 
2047  cf->pager_start = 0;
2048  int m = cf->pager_start + (cf->height - 1);
2049  unix_cli_pager_prompt_erase (cf, uf);
2050  for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
2051  j++)
2052  {
2053  pi = &cf->pager_index[j];
2054  line = cf->pager_vector[pi->line] + pi->offset;
2055  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
2056  }
2057  /* if the last line didn't end in newline, add a newline */
2058  if (pi && line[pi->length - 1] != '\n')
2059  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
2060  unix_cli_pager_prompt (cf, uf);
2061  }
2062  break;
2063 
2065  /* skip to the last page of the buffer */
2066  if (cf->pager_start < vec_len (cf->pager_index) - (cf->height - 1))
2067  {
2068  u8 *line = NULL;
2070 
2071  cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
2072  unix_cli_pager_prompt_erase (cf, uf);
2073  unix_cli_pager_message (cf, uf, "skipping", "\n");
2074  for (j = cf->pager_start; j < vec_len (cf->pager_index); j++)
2075  {
2076  pi = &cf->pager_index[j];
2077  line = cf->pager_vector[pi->line] + pi->offset;
2078  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
2079  }
2080  /* if the last line didn't end in newline, add a newline */
2081  if (pi && line[pi->length - 1] != '\n')
2082  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
2083  unix_cli_pager_prompt (cf, uf);
2084  }
2085  break;
2086 
2088  /* wander back one page in the buffer */
2089  if (cf->pager_start > 0)
2090  {
2091  u8 *line = NULL;
2093  int m;
2094 
2095  if (cf->pager_start >= cf->height)
2096  cf->pager_start -= cf->height - 1;
2097  else
2098  cf->pager_start = 0;
2099  m = cf->pager_start + cf->height - 1;
2100  unix_cli_pager_prompt_erase (cf, uf);
2101  for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
2102  j++)
2103  {
2104  pi = &cf->pager_index[j];
2105  line = cf->pager_vector[pi->line] + pi->offset;
2106  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
2107  }
2108  /* if the last line didn't end in newline, add a newline */
2109  if (pi && line[pi->length - 1] != '\n')
2110  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
2111  unix_cli_pager_prompt (cf, uf);
2112  }
2113  break;
2114 
2116  /* Redraw the current pager screen */
2117  unix_cli_pager_redraw (cf, uf);
2118  break;
2119 
2121  /* search forwards in the buffer */
2122  break;
2123 
2124 
2126  crlf:
2127  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
2128 
2129  if (cf->has_history && cf->history_limit)
2130  {
2131  if (cf->command_history
2132  && vec_len (cf->command_history) >= cf->history_limit)
2133  {
2134  vec_free (cf->command_history[0]);
2135  vec_delete (cf->command_history, 1, 0);
2136  }
2137  /* Don't add blank lines to the cmd history */
2138  if (vec_len (cf->current_command))
2139  {
2140  /* Don't duplicate the previous command */
2141  j = vec_len (cf->command_history);
2142  if (j == 0 ||
2143  (vec_len (cf->current_command) !=
2144  vec_len (cf->command_history[j - 1])
2145  || memcmp (cf->current_command, cf->command_history[j - 1],
2146  vec_len (cf->current_command)) != 0))
2147  {
2148  /* copy the command to the history */
2149  u8 *c = 0;
2150  vec_append (c, cf->current_command);
2151  vec_add1 (cf->command_history, c);
2152  cf->command_number++;
2153  }
2154  }
2155  cf->excursion = vec_len (cf->command_history);
2156  }
2157 
2158  cf->search_mode = 0;
2160  cf->cursor = 0;
2161 
2162  return 0;
2163 
2166  if (vec_len (cf->pager_index))
2167  {
2168  /* no-op for now */
2169  }
2170  else if (cf->has_history && cf->search_mode != 0 && isprint (input))
2171  {
2172  int k, limit, offset;
2173  u8 *item;
2174 
2175  vec_add1 (cf->search_key, input);
2176 
2177  search_again:
2178  for (j = 0; j < vec_len (cf->command_history); j++)
2179  {
2180  if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
2181  cf->excursion = 0;
2182  else if (cf->excursion < 0)
2183  cf->excursion = vec_len (cf->command_history) - 1;
2184 
2185  item = cf->command_history[cf->excursion];
2186 
2187  limit = (vec_len (cf->search_key) > vec_len (item)) ?
2188  vec_len (item) : vec_len (cf->search_key);
2189 
2190  for (offset = 0; offset <= vec_len (item) - limit; offset++)
2191  {
2192  for (k = 0; k < limit; k++)
2193  {
2194  if (item[k + offset] != cf->search_key[k])
2195  goto next_offset;
2196  }
2197  goto found_at_offset;
2198 
2199  next_offset:
2200  ;
2201  }
2202  goto next;
2203 
2204  found_at_offset:
2205  for (; cf->cursor > 0; cf->cursor--)
2206  {
2208  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
2210  }
2211 
2212  vec_validate (cf->current_command, vec_len (item) - 1);
2213  clib_memcpy (cf->current_command, item, vec_len (item));
2214  _vec_len (cf->current_command) = vec_len (item);
2215 
2217  vec_len (cf->current_command));
2218  cf->cursor = vec_len (cf->current_command);
2219  goto found;
2220 
2221  next:
2222  cf->excursion += cf->search_mode;
2223  }
2224 
2225  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\nNo match...", 12);
2228  cf->search_mode = 0;
2229  cf->cursor = 0;
2230  goto crlf;
2231  }
2232  else if (isprint (input)) /* skip any errant control codes */
2233  {
2234  if (cf->cursor == vec_len (cf->current_command))
2235  {
2236  /* Append to end */
2237  vec_add1 (cf->current_command, input);
2238  cf->cursor++;
2239 
2240  /* Echo the character back to the client */
2241  unix_vlib_cli_output_cooked (cf, uf, &input, 1);
2242  }
2243  else
2244  {
2245  /* Insert at cursor: resize +1 byte, move everything over */
2246  j = vec_len (cf->current_command) - cf->cursor;
2247  vec_add1 (cf->current_command, (u8) 'A');
2248  memmove (cf->current_command + cf->cursor + 1,
2249  cf->current_command + cf->cursor, j);
2250  cf->current_command[cf->cursor] = input;
2251  /* Redraw the line */
2252  j++;
2254  cf->current_command + cf->cursor,
2255  j);
2256  cf->cursor += j;
2257  j--;
2258  /* Put terminal cursor back */
2259  for (; j > 0; j--, cf->cursor--)
2261  }
2262  }
2263  else
2264  {
2265  /* no-op - not printable or otherwise not actionable */
2266  }
2267 
2268  found:
2269 
2270  break;
2271 
2273  break;
2274  }
2275  return 1;
2276 }
2277 
2278 /** @brief Process input bytes on a stream to provide line editing and
2279  * command history in the CLI. */
2280 static int
2283 {
2285  int i;
2286 
2287  for (i = 0; i < vec_len (cf->input_vector); i++)
2288  {
2289  unix_cli_parse_action_t action;
2290  i32 matched = 0;
2292 
2293  /* If we're in the pager mode, search the pager actions */
2294  a =
2297 
2298  /* See if the input buffer is some sort of control code */
2299  action = unix_cli_match_action (a, &cf->input_vector[i],
2300  vec_len (cf->input_vector) - i,
2301  &matched);
2302 
2303  switch (action)
2304  {
2306  if (i)
2307  {
2308  /* There was a partial match which means we need more bytes
2309  * than the input buffer currently has.
2310  * Since the bytes before here have been processed, shift
2311  * the remaining contents to the start of the input buffer.
2312  */
2313  vec_delete (cf->input_vector, i, 0);
2314  }
2315  return 1; /* wait for more */
2316 
2318  /* process telnet options */
2319  matched = unix_cli_process_telnet (um, cf, uf,
2320  cf->input_vector + i,
2321  vec_len (cf->input_vector) - i);
2322  if (matched < 0)
2323  {
2324  /* There was a partial match which means we need more bytes
2325  * than the input buffer currently has.
2326  */
2327  if (i)
2328  {
2329  /*
2330  * Since the bytes before here have been processed, shift
2331  * the remaining contents to the start of the input buffer.
2332  */
2333  vec_delete (cf->input_vector, i, 0);
2334  }
2335  return 1; /* wait for more */
2336  }
2337  break;
2338 
2339  default:
2340  /* If telnet option processing switched us to line mode, get us
2341  * out of here!
2342  */
2343  if (cf->line_mode)
2344  {
2345  vec_delete (cf->input_vector, i, 0);
2346  cf->current_command = cf->input_vector;
2347  return 0;
2348  }
2349 
2350  /* process the action */
2351  if (!unix_cli_line_process_one (cm, um, cf, uf,
2352  cf->input_vector[i], action))
2353  {
2354  /* CRLF found. Consume the bytes from the input_vector */
2355  vec_delete (cf->input_vector, i + matched, 0);
2356  /* And tell our caller to execute cf->input_command */
2357  return 0;
2358  }
2359  }
2360 
2361  i += matched;
2362  }
2363 
2365  return 1;
2366 }
2367 
2368 /** @brief Process input to a CLI session. */
2369 static void
2371 {
2372  unix_main_t *um = &unix_main;
2374  clib_file_t *uf;
2375  unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
2376  unformat_input_t input;
2377  int vlib_parse_eval (u8 *);
2378 
2379  cm->current_input_file_index = cli_file_index;
2380 
2381 more:
2382  /* Try vlibplex first. Someday... */
2383  if (0 && vlib_parse_eval (cf->input_vector) == 0)
2384  goto done;
2385 
2386 
2387  if (cf->line_mode)
2388  {
2389  /* just treat whatever we got as a complete line of input */
2390  cf->current_command = cf->input_vector;
2391  }
2392  else
2393  {
2394  /* Line edit, echo, etc. */
2395  if (unix_cli_line_edit (cm, um, fm, cf))
2396  /* want more input */
2397  return;
2398  }
2399 
2400  if (um->log_fd)
2401  {
2402  static u8 *lv;
2403  vec_reset_length (lv);
2404  lv = format (lv, "%U[%d]: %v",
2405  format_timeval, 0 /* current bat-time */ ,
2406  0 /* current bat-format */ ,
2407  cli_file_index, cf->current_command);
2408  int rv __attribute__ ((unused)) = write (um->log_fd, lv, vec_len (lv));
2409  }
2410 
2411  /* Build an unformat structure around our command */
2412  unformat_init_vector (&input, cf->current_command);
2413 
2414  /* Remove leading white space from input. */
2415  (void) unformat (&input, "");
2416 
2417  cf->pager_start = 0; /* start a new pager session */
2418 
2421  cli_file_index);
2422 
2423  /* Zero buffer since otherwise unformat_free will call vec_free on it. */
2424  input.buffer = 0;
2425 
2426  unformat_free (&input);
2427 
2428  /* Re-fetch pointer since pool may have moved. */
2429  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
2431 
2432 done:
2433  /* reset vector; we'll re-use it later */
2434  if (cf->line_mode)
2435  {
2437  cf->current_command = 0;
2438  }
2439  else
2440  {
2442  }
2443 
2444  if (cf->no_pager == 2)
2445  {
2446  /* Pager was programmatically disabled */
2447  unix_cli_pager_message (cf, uf, "pager buffer overflowed", "\n");
2448  cf->no_pager = um->cli_no_pager;
2449  }
2450 
2451  if (vec_len (cf->pager_index) == 0
2452  || vec_len (cf->pager_index) < cf->height)
2453  {
2454  /* There was no need for the pager */
2455  unix_cli_pager_reset (cf);
2456 
2457  /* Prompt. */
2458  unix_cli_cli_prompt (cf, uf);
2459  }
2460  else
2461  {
2462  /* Display the pager prompt */
2463  unix_cli_pager_prompt (cf, uf);
2464  }
2465 
2466  /* Any residual data in the input vector? */
2467  if (vec_len (cf->input_vector))
2468  goto more;
2469 
2470  /* For non-interactive sessions send a NUL byte.
2471  * Specifically this is because vppctl needs to see some traffic in
2472  * order to move on to closing the session. Commands with no output
2473  * would thus cause vppctl to hang indefinitely in non-interactive mode
2474  * since there is also no prompt sent after the command completes.
2475  */
2476  if (!cf->is_interactive)
2477  unix_vlib_cli_output_raw (cf, uf, (u8 *) "\0", 1);
2478 }
2479 
2480 /** Destroy a CLI session.
2481  * @note If we destroy the @c stdin session this additionally signals
2482  * the shutdown of VPP.
2483  */
2484 static void
2485 unix_cli_kill (unix_cli_main_t * cm, uword cli_file_index)
2486 {
2487  unix_main_t *um = &unix_main;
2489  unix_cli_file_t *cf;
2490  clib_file_t *uf;
2491  int i;
2492 
2493  /* Validate cli_file_index */
2494  if (pool_is_free_index (cm->cli_file_pool, cli_file_index))
2495  return;
2496 
2497  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
2499 
2500  /* Quit/EOF on stdin means quit program. */
2501  if (uf->file_descriptor == STDIN_FILENO)
2503 
2504  vec_free (cf->current_command);
2505  vec_free (cf->search_key);
2506 
2507  for (i = 0; i < vec_len (cf->command_history); i++)
2508  vec_free (cf->command_history[i]);
2509 
2510  vec_free (cf->command_history);
2511 
2512  clib_file_del (fm, uf);
2513 
2514  unix_cli_file_free (cf);
2515  pool_put (cm->cli_file_pool, cf);
2516 }
2517 
2518 /** Handle system events. */
2519 static uword
2522 {
2524  uword i, *data = 0;
2525 
2526  while (1)
2527  {
2528  unix_cli_process_event_type_t event_type;
2530  event_type = vlib_process_get_events (vm, &data);
2531 
2532  switch (event_type)
2533  {
2535  for (i = 0; i < vec_len (data); i++)
2536  unix_cli_process_input (cm, data[i]);
2537  break;
2538 
2540  /* Kill this process. */
2541  for (i = 0; i < vec_len (data); i++)
2542  unix_cli_kill (cm, data[i]);
2543  goto done;
2544  }
2545 
2546  if (data)
2547  _vec_len (data) = 0;
2548  }
2549 
2550 done:
2551  vec_free (data);
2552 
2553  vlib_node_set_state (vm, rt->node_index, VLIB_NODE_STATE_DISABLED);
2554 
2555  /* Add node index so we can re-use this process later. */
2557 
2558  return 0;
2559 }
2560 
2561 /** Called when a CLI session file descriptor can be written to without
2562  * blocking. */
2563 static clib_error_t *
2565 {
2567  unix_cli_file_t *cf;
2568  int n;
2569 
2571 
2572  /* Flush output vector. */
2573  if (cf->is_socket)
2574  /* If it's a socket we use MSG_NOSIGNAL to prevent SIGPIPE */
2575  n = send (uf->file_descriptor,
2576  cf->output_vector, vec_len (cf->output_vector), MSG_NOSIGNAL);
2577  else
2578  n = write (uf->file_descriptor,
2579  cf->output_vector, vec_len (cf->output_vector));
2580 
2581  if (n < 0 && errno != EAGAIN)
2582  {
2583  if (errno == EPIPE)
2584  {
2585  /* connection closed on us */
2586  unix_main_t *um = &unix_main;
2587  cf->has_epipe = 1;
2590  uf->private_data);
2591  }
2592  else
2593  {
2594  return clib_error_return_unix (0, "write");
2595  }
2596  }
2597 
2598  else if (n > 0)
2599  unix_cli_del_pending_output (uf, cf, n);
2600 
2601  return /* no error */ 0;
2602 }
2603 
2604 /** Called when a CLI session file descriptor has data to be read. */
2605 static clib_error_t *
2607 {
2608  unix_main_t *um = &unix_main;
2610  unix_cli_file_t *cf;
2611  uword l;
2612  int n, n_read, n_try;
2613 
2615 
2616  n = n_try = 4096;
2617  while (n == n_try)
2618  {
2619  l = vec_len (cf->input_vector);
2620  vec_resize (cf->input_vector, l + n_try);
2621 
2622  n = read (uf->file_descriptor, cf->input_vector + l, n_try);
2623 
2624  /* Error? */
2625  if (n < 0 && errno != EAGAIN)
2626  return clib_error_return_unix (0, "read");
2627 
2628  n_read = n < 0 ? 0 : n;
2629  _vec_len (cf->input_vector) = l + n_read;
2630  }
2631 
2632  if (!(n < 0))
2634  cf->process_node_index,
2635  (n_read == 0
2638  /* event data */ uf->private_data);
2639 
2640  return /* no error */ 0;
2641 }
2642 
2643 /** Called when a CLI session file descriptor has an error condition. */
2644 static clib_error_t *
2646 {
2647  unix_main_t *um = &unix_main;
2649  unix_cli_file_t *cf;
2650 
2652  cf->has_epipe = 1; /* prevent writes while the close is pending */
2654  cf->process_node_index,
2656  /* event data */ uf->private_data);
2657 
2658  return /* no error */ 0;
2659 }
2660 
2661 /** Store a new CLI session.
2662  * @param name The name of the session.
2663  * @param fd The file descriptor for the session I/O.
2664  * @return The session ID.
2665  */
2666 static u32
2668 {
2669  unix_main_t *um = &unix_main;
2671  unix_cli_file_t *cf;
2672  clib_file_t template = { 0 };
2673  vlib_main_t *vm = um->vlib_main;
2674  vlib_node_t *n = 0;
2675  u8 *file_desc = 0;
2676 
2677  file_desc = format (0, "%s", name);
2678 
2679  name = (char *) format (0, "unix-cli-%s", name);
2680 
2682  {
2684  int i;
2685  vlib_main_t *this_vlib_main;
2686  u8 *old_name = 0;
2687 
2688  /*
2689  * Nodes are bulk-copied, so node name pointers are shared.
2690  * Find the cli node in all graph replicas, and give all of them
2691  * the same new name.
2692  * Then, throw away the old shared name-vector.
2693  */
2694  for (i = 0; i < vec_len (vlib_mains); i++)
2695  {
2696  this_vlib_main = vlib_mains[i];
2697  if (this_vlib_main == 0)
2698  continue;
2699  n = vlib_get_node (this_vlib_main,
2700  cm->unused_cli_process_node_indices[l - 1]);
2701  old_name = n->name;
2702  n->name = (u8 *) name;
2703  }
2704  vec_free (old_name);
2705 
2706  vlib_node_set_state (vm, n->index, VLIB_NODE_STATE_POLLING);
2707 
2708  _vec_len (cm->unused_cli_process_node_indices) = l - 1;
2709  }
2710  else
2711  {
2712  static vlib_node_registration_t r = {
2713  .function = unix_cli_process,
2714  .type = VLIB_NODE_TYPE_PROCESS,
2715  .process_log2_n_stack_bytes = 16,
2716  };
2717 
2718  r.name = name;
2719 
2721 
2722  vlib_register_node (vm, &r);
2723  vec_free (name);
2724 
2725  n = vlib_get_node (vm, r.index);
2728  }
2729 
2730  pool_get (cm->cli_file_pool, cf);
2731  clib_memset (cf, 0, sizeof (*cf));
2732 
2733  template.read_function = unix_cli_read_ready;
2734  template.write_function = unix_cli_write_ready;
2735  template.error_function = unix_cli_error_detected;
2736  template.file_descriptor = fd;
2737  template.private_data = cf - cm->cli_file_pool;
2738  template.description = file_desc;
2739 
2740  cf->process_node_index = n->index;
2741  cf->clib_file_index = clib_file_add (fm, &template);
2742  cf->output_vector = 0;
2743  cf->input_vector = 0;
2744 
2746 
2749  p->output_function_arg = cf - cm->cli_file_pool;
2750 
2751  return cf - cm->cli_file_pool;
2752 }
2753 
2754 /** Telnet listening socket has a new connection. */
2755 static clib_error_t *
2757 {
2758  unix_main_t *um = &unix_main;
2761  clib_socket_t *s = &um->cli_listen_socket;
2762  clib_socket_t client;
2763  char *client_name;
2764  clib_error_t *error;
2765  unix_cli_file_t *cf;
2766  u32 cf_index;
2767  int one;
2768 
2769  error = clib_socket_accept (s, &client);
2770  if (error)
2771  return error;
2772 
2773  /* Disable Nagle, ignore any errors doing so eg on PF_LOCAL socket */
2774  one = 1;
2775  (void) setsockopt (client.fd, IPPROTO_TCP, TCP_NODELAY,
2776  (void *) &one, sizeof (one));
2777 
2778  client_name = (char *) format (0, "%U%c", format_sockaddr, &client.peer, 0);
2779 
2780  cf_index = unix_cli_file_add (cm, client_name, client.fd);
2781  cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
2782  cf->is_socket = 1;
2783 
2784  /* No longer need CLIB version of socket. */
2785  clib_socket_free (&client);
2786  vec_free (client_name);
2787 
2788  /* if we're supposed to run telnet session in character mode (default) */
2789  if (um->cli_line_mode == 0)
2790  {
2791  /*
2792  * Set telnet client character mode, echo on, suppress "go-ahead".
2793  * Technically these should be negotiated, but this works.
2794  */
2795  u8 charmode_option[] = {
2796  IAC, WONT, TELOPT_LINEMODE, /* server will do char-by-char */
2797  IAC, DONT, TELOPT_LINEMODE, /* client should do char-by-char */
2798  IAC, WILL, TELOPT_SGA, /* server willl supress GA */
2799  IAC, DO, TELOPT_SGA, /* client should supress Go Ahead */
2800  IAC, WILL, TELOPT_ECHO, /* server will do echo */
2801  IAC, DONT, TELOPT_ECHO, /* client should not echo */
2802  IAC, DO, TELOPT_TTYPE, /* client should tell us its term type */
2803  IAC, SB, TELOPT_TTYPE, 1, IAC, SE, /* now tell me ttype */
2804  IAC, DO, TELOPT_NAWS, /* client should tell us its window sz */
2805  IAC, SB, TELOPT_NAWS, 1, IAC, SE, /* now tell me window size */
2806  };
2807 
2808  /* Enable history on this CLI */
2809  cf->history_limit = um->cli_history_limit;
2810  cf->has_history = cf->history_limit != 0;
2811 
2812  /* This is an interactive session until we decide otherwise */
2813  cf->is_interactive = 1;
2814 
2815  /* Make sure this session is in line mode */
2816  cf->line_mode = 0;
2817 
2818  /* We need CRLF */
2819  cf->crlf_mode = 1;
2820 
2821  /* Setup the pager */
2822  cf->no_pager = um->cli_no_pager;
2823 
2824  /* Default terminal dimensions, should the terminal
2825  * fail to provide any.
2826  */
2829 
2830  /* Send the telnet options */
2832  unix_vlib_cli_output_raw (cf, uf, charmode_option,
2833  ARRAY_LEN (charmode_option));
2834 
2835  /* In case the client doesn't negotiate terminal type, use
2836  * a timer to kick off the initial prompt. */
2837  timer_call (unix_cli_file_welcome_timer, cf_index, 1);
2838  }
2839 
2840  return error;
2841 }
2842 
2843 /** The system terminal has informed us that the window size
2844  * has changed.
2845  */
2846 static void
2848 {
2852  cm->stdin_cli_file_index);
2854  struct winsize ws;
2855  (void) signum;
2856 
2857  /* Terminal resized, fetch the new size */
2858  if (ioctl (STDIN_FILENO, TIOCGWINSZ, &ws) < 0)
2859  {
2860  /* "Should never happen..." */
2861  clib_unix_warning ("TIOCGWINSZ");
2862  /* We can't trust ws.XXX... */
2863  return;
2864  }
2865 
2866  cf->width = ws.ws_col;
2869  if (cf->width == 0)
2871 
2872  cf->height = ws.ws_row;
2875  if (cf->height == 0)
2877 
2878  /* Reindex the pager buffer */
2880 
2881  /* Redraw the page */
2882  unix_cli_pager_redraw (cf, uf);
2883 }
2884 
2885 /** Handle configuration directives in the @em unix section. */
2886 static clib_error_t *
2888 {
2889  unix_main_t *um = &unix_main;
2892  int flags;
2893  clib_error_t *error = 0;
2894  unix_cli_file_t *cf;
2895  u32 cf_index;
2896  struct termios tio;
2897  struct sigaction sa;
2898  struct winsize ws;
2899  u8 *term;
2900 
2901  /* We depend on unix flags being set. */
2902  if ((error = vlib_call_config_function (vm, unix_config)))
2903  return error;
2904 
2905  if (um->flags & UNIX_FLAG_INTERACTIVE)
2906  {
2907  /* Set stdin to be non-blocking. */
2908  if ((flags = fcntl (STDIN_FILENO, F_GETFL, 0)) < 0)
2909  flags = 0;
2910  (void) fcntl (STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);
2911 
2912  cf_index = unix_cli_file_add (cm, "stdin", STDIN_FILENO);
2913  cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
2914  cm->stdin_cli_file_index = cf_index;
2915 
2916  /* If stdin is a tty and we are using chacracter mode, enable
2917  * history on the CLI and set the tty line discipline accordingly. */
2918  if (isatty (STDIN_FILENO) && um->cli_line_mode == 0)
2919  {
2920  /* Capture terminal resize events */
2921  clib_memset (&sa, 0, sizeof (sa));
2922  sa.sa_handler = unix_cli_resize_interrupt;
2923  if (sigaction (SIGWINCH, &sa, 0) < 0)
2924  clib_panic ("sigaction");
2925 
2926  /* Retrieve the current terminal size */
2927  ioctl (STDIN_FILENO, TIOCGWINSZ, &ws);
2928  cf->width = ws.ws_col;
2929  cf->height = ws.ws_row;
2930 
2931  if (cf->width == 0 || cf->height == 0)
2932  {
2933  /*
2934  * We have a tty, but no size. Use defaults.
2935  * vpp "unix interactive" inside emacs + gdb ends up here.
2936  */
2939  }
2940 
2941  /* Setup the history */
2942  cf->history_limit = um->cli_history_limit;
2943  cf->has_history = cf->history_limit != 0;
2944 
2945  /* Setup the pager */
2946  cf->no_pager = um->cli_no_pager;
2947 
2948  /* This is an interactive session until we decide otherwise */
2949  cf->is_interactive = 1;
2950 
2951  /* We're going to be in char by char mode */
2952  cf->line_mode = 0;
2953 
2954  /* Save the original tty state so we can restore it later */
2955  tcgetattr (STDIN_FILENO, &um->tio_stdin);
2956  um->tio_isset = 1;
2957 
2958  /* Tweak the tty settings */
2959  tio = um->tio_stdin;
2960  /* echo off, canonical mode off, ext'd input processing off */
2961  tio.c_lflag &= ~(ECHO | ICANON | IEXTEN);
2962  /* disable XON/XOFF, so ^S invokes the history search */
2963  tio.c_iflag &= ~(IXON | IXOFF);
2964  tio.c_cc[VMIN] = 1; /* 1 byte at a time */
2965  tio.c_cc[VTIME] = 0; /* no timer */
2966  tio.c_cc[VSTOP] = _POSIX_VDISABLE; /* not ^S */
2967  tio.c_cc[VSTART] = _POSIX_VDISABLE; /* not ^Q */
2968  tcsetattr (STDIN_FILENO, TCSAFLUSH, &tio);
2969 
2970  /* See if we can do ANSI/VT100 output */
2971  term = (u8 *) getenv ("TERM");
2972  if (term != NULL)
2973  {
2974  int len = strlen ((char *) term);
2975  cf->ansi_capable = unix_cli_terminal_type_ansi (term, len);
2976  if (unix_cli_terminal_type_noninteractive (term, len))
2978  }
2979  }
2980  else
2981  {
2982  /* No tty, so make sure the session doesn't have tty-like features */
2984  }
2985 
2986  /* Send banner and initial prompt */
2987  unix_cli_file_welcome (cm, cf);
2988  }
2989 
2990  /* If we have socket config, LISTEN, otherwise, don't */
2991  clib_socket_t *s = &um->cli_listen_socket;
2992  if (s->config && s->config[0] != 0)
2993  {
2994  /* CLI listen. */
2995  clib_file_t template = { 0 };
2996 
2997  /* mkdir of file socketu, only under /run */
2998  if (strncmp (s->config, "/run", 4) == 0)
2999  {
3000  u8 *tmp = format (0, "%s", s->config);
3001  int i = vec_len (tmp);
3002  while (i && tmp[--i] != '/')
3003  ;
3004 
3005  tmp[i] = 0;
3006 
3007  if (i)
3008  vlib_unix_recursive_mkdir ((char *) tmp);
3009  vec_free (tmp);
3010  }
3011 
3012  s->flags = CLIB_SOCKET_F_IS_SERVER | /* listen, don't connect */
3013  CLIB_SOCKET_F_ALLOW_GROUP_WRITE; /* PF_LOCAL socket only */
3014  error = clib_socket_init (s);
3015 
3016  if (error)
3017  return error;
3018 
3019  template.read_function = unix_cli_listen_read_ready;
3020  template.file_descriptor = s->fd;
3021  template.description = format (0, "cli listener %s", s->config);
3022 
3023  clib_file_add (fm, &template);
3024  }
3025 
3026  /* Set CLI prompt. */
3027  if (!cm->cli_prompt)
3028  cm->cli_prompt = format (0, "VLIB: ");
3029 
3030  return 0;
3031 }
3032 
3033 /*?
3034  * This module has no configurable parameters.
3035 ?*/
3037 
3038 /** Called when VPP is shutting down, this restores the system
3039  * terminal state if previously saved.
3040  */
3041 static clib_error_t *
3043 {
3044  unix_main_t *um = &unix_main;
3045 
3046  /* If stdin is a tty and we saved the tty state, reset the tty state */
3047  if (isatty (STDIN_FILENO) && um->tio_isset)
3048  tcsetattr (STDIN_FILENO, TCSAFLUSH, &um->tio_stdin);
3049 
3050  return 0;
3051 }
3052 
3054 
3055 /** Set the CLI prompt.
3056  * @param prompt The C string to set the prompt to.
3057  * @note This setting is global; it impacts all current
3058  * and future CLI sessions.
3059  */
3060 void
3062 {
3063  char *fmt = (prompt[strlen (prompt) - 1] == ' ') ? "%s" : "%s ";
3065  if (cm->cli_prompt)
3066  vec_free (cm->cli_prompt);
3067  cm->cli_prompt = format (0, fmt, prompt);
3068 }
3069 
3070 /** CLI command to quit the terminal session.
3071  * @note If this is a stdin session then this will
3072  * shutdown VPP also.
3073  */
3074 static clib_error_t *
3076  unformat_input_t * input, vlib_cli_command_t * cmd)
3077 {
3081 
3082  /* Cosmetic: suppress the final prompt from appearing before we die */
3083  cf->is_interactive = 0;
3084  cf->started = 1;
3085 
3087  vlib_current_process (vm),
3090  return 0;
3091 }
3092 
3093 /*?
3094  * Terminates the current CLI session.
3095  *
3096  * If VPP is running in @em interactive mode and this is the console session
3097  * (that is, the session on @c stdin) then this will also terminate VPP.
3098 ?*/
3099 /* *INDENT-OFF* */
3100 VLIB_CLI_COMMAND (unix_cli_quit_command, static) = {
3101  .path = "quit",
3102  .short_help = "Exit CLI",
3103  .function = unix_cli_quit,
3104 };
3105 /* *INDENT-ON* */
3106 
3107 /* *INDENT-OFF* */
3108 VLIB_CLI_COMMAND (unix_cli_q_command, static) = {
3109  .path = "q",
3110  .short_help = "Exit CLI",
3111  .function = unix_cli_quit,
3112 };
3113 /* *INDENT-ON* */
3114 
3115 /** CLI command to execute a VPP command script. */
3116 static clib_error_t *
3118  unformat_input_t * input, vlib_cli_command_t * cmd)
3119 {
3120  char *file_name;
3121  int fd;
3122  unformat_input_t sub_input;
3123  clib_error_t *error;
3124 
3125  file_name = 0;
3126  fd = -1;
3127  error = 0;
3128 
3129  if (!unformat (input, "%s", &file_name))
3130  {
3131  error = clib_error_return (0, "expecting file name, got `%U'",
3132  format_unformat_error, input);
3133  goto done;
3134  }
3135 
3136  fd = open (file_name, O_RDONLY);
3137  if (fd < 0)
3138  {
3139  error = clib_error_return_unix (0, "failed to open `%s'", file_name);
3140  goto done;
3141  }
3142 
3143  /* Make sure its a regular file. */
3144  {
3145  struct stat s;
3146 
3147  if (fstat (fd, &s) < 0)
3148  {
3149  error = clib_error_return_unix (0, "failed to stat `%s'", file_name);
3150  goto done;
3151  }
3152 
3153  if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
3154  {
3155  error = clib_error_return (0, "not a regular file `%s'", file_name);
3156  goto done;
3157  }
3158  }
3159 
3160  unformat_init_clib_file (&sub_input, fd);
3161 
3162  vlib_cli_input (vm, &sub_input, 0, 0);
3163  unformat_free (&sub_input);
3164 
3165 done:
3166  if (fd > 0)
3167  close (fd);
3168  vec_free (file_name);
3169 
3170  return error;
3171 }
3172 
3173 /*?
3174  * Executes a sequence of CLI commands which are read from a file. If
3175  * a command is unrecognised or otherwise invalid then the usual CLI
3176  * feedback will be generated, however execution of subsequent commands
3177  * from the file will continue.
3178  *
3179  * The VPP code is indifferent to the file location. However, if SELinux
3180  * is enabled, then the file needs to have an SELinux label the VPP
3181  * process is allowed to access. For example, if a file is created in
3182  * '<em>/usr/share/vpp/</em>', it will be allowed. However, files manually
3183  * created in '/tmp/' or '/home/<user>/' will not be accessible by the VPP
3184  * process when SELinux is enabled.
3185  *
3186  * @cliexpar
3187  * Sample file:
3188  * @clistart
3189  * <b><em>$ cat /usr/share/vpp/scripts/gigup.txt</em></b>
3190  * set interface state GigabitEthernet0/8/0 up
3191  * set interface state GigabitEthernet0/9/0 up
3192  * @cliend
3193  * Example of how to execute a set of CLI commands from a file:
3194  * @cliexcmd{exec /usr/share/vpp/scripts/gigup.txt}
3195 ?*/
3196 /* *INDENT-OFF* */
3197 VLIB_CLI_COMMAND (cli_exec, static) = {
3198  .path = "exec",
3199  .short_help = "exec <filename>",
3200  .function = unix_cli_exec,
3201  .is_mp_safe = 1,
3202 };
3203 /* *INDENT-ON* */
3204 
3205 /** CLI command to show various unix error statistics. */
3206 static clib_error_t *
3208  unformat_input_t * input, vlib_cli_command_t * cmd)
3209 {
3210  unix_main_t *um = &unix_main;
3211  clib_error_t *error = 0;
3212  int i, n_errors_to_show;
3213  unix_error_history_t *unix_errors = 0;
3214 
3215  n_errors_to_show = 1 << 30;
3216 
3218  {
3219  if (!unformat (input, "%d", &n_errors_to_show))
3220  {
3221  error =
3222  clib_error_return (0,
3223  "expecting integer number of errors to show, got `%U'",
3224  format_unformat_error, input);
3225  goto done;
3226  }
3227  }
3228 
3229  n_errors_to_show =
3230  clib_min (ARRAY_LEN (um->error_history), n_errors_to_show);
3231 
3232  i =
3233  um->error_history_index >
3234  0 ? um->error_history_index - 1 : ARRAY_LEN (um->error_history) - 1;
3235 
3236  while (n_errors_to_show > 0)
3237  {
3238  unix_error_history_t *eh = um->error_history + i;
3239 
3240  if (!eh->error)
3241  break;
3242 
3243  vec_add1 (unix_errors, eh[0]);
3244  n_errors_to_show -= 1;
3245  if (i == 0)
3246  i = ARRAY_LEN (um->error_history) - 1;
3247  else
3248  i--;
3249  }
3250 
3251  if (vec_len (unix_errors) == 0)
3252  vlib_cli_output (vm, "no Unix errors so far");
3253  else
3254  {
3255  vlib_cli_output (vm, "%Ld total errors seen", um->n_total_errors);
3256  for (i = vec_len (unix_errors) - 1; i >= 0; i--)
3257  {
3258  unix_error_history_t *eh = vec_elt_at_index (unix_errors, i);
3259  vlib_cli_output (vm, "%U: %U",
3260  format_time_interval, "h:m:s:u", eh->time,
3261  format_clib_error, eh->error);
3262  }
3263  vlib_cli_output (vm, "%U: time now",
3264  format_time_interval, "h:m:s:u", vlib_time_now (vm));
3265  }
3266 
3267 done:
3268  vec_free (unix_errors);
3269  return error;
3270 }
3271 
3272 /* *INDENT-OFF* */
3273 VLIB_CLI_COMMAND (cli_unix_show_errors, static) = {
3274  .path = "show unix errors",
3275  .short_help = "Show Unix system call error history",
3276  .function = unix_show_errors,
3277 };
3278 /* *INDENT-ON* */
3279 
3280 /** CLI command to show various unix error statistics. */
3281 static clib_error_t *
3283  unformat_input_t * input, vlib_cli_command_t * cmd)
3284 {
3285  clib_error_t *error = 0;
3287  clib_file_t *f;
3288  char path[PATH_MAX];
3289  u8 *s = 0;
3290 
3291  vlib_cli_output (vm, "%3s %6s %12s %12s %12s %-32s %s", "FD", "Thread",
3292  "Read", "Write", "Error", "File Name", "Description");
3293 
3294  /* *INDENT-OFF* */
3295  pool_foreach (f, fm->file_pool,(
3296  {
3297  int rv;
3298  s = format (s, "/proc/self/fd/%d%c", f->file_descriptor, 0);
3299  rv = readlink((char *) s, path, PATH_MAX - 1);
3300 
3301  path[rv < 0 ? 0 : rv] = 0;
3302 
3303  vlib_cli_output (vm, "%3d %6d %12d %12d %12d %-32s %v",
3304  f->file_descriptor, f->polling_thread_index,
3305  f->read_events, f->write_events, f->error_events,
3306  path, f->description);
3307  vec_reset_length (s);
3308  }));
3309  /* *INDENT-ON* */
3310  vec_free (s);
3311 
3312  return error;
3313 }
3314 
3315 /* *INDENT-OFF* */
3316 VLIB_CLI_COMMAND (cli_unix_show_files, static) = {
3317  .path = "show unix files",
3318  .short_help = "Show Unix files in use",
3319  .function = unix_show_files,
3320 };
3321 /* *INDENT-ON* */
3322 
3323 /** CLI command to show session command history. */
3324 static clib_error_t *
3326  unformat_input_t * input, vlib_cli_command_t * cmd)
3327 {
3329  unix_cli_file_t *cf;
3330  int i, j;
3331 
3333 
3334  if (!cf->is_interactive)
3335  return clib_error_return (0, "invalid for non-interactive sessions");
3336 
3337  if (cf->has_history && cf->history_limit)
3338  {
3339  i = 1 + cf->command_number - vec_len (cf->command_history);
3340  for (j = 0; j < vec_len (cf->command_history); j++)
3341  vlib_cli_output (vm, "%d %v\n", i + j, cf->command_history[j]);
3342  }
3343  else
3344  {
3345  vlib_cli_output (vm, "History not enabled.\n");
3346  }
3347 
3348  return 0;
3349 }
3350 
3351 /*?
3352  * Displays the command history for the current session, if any.
3353 ?*/
3354 /* *INDENT-OFF* */
3355 VLIB_CLI_COMMAND (cli_unix_cli_show_history, static) = {
3356  .path = "history",
3357  .short_help = "Show current session command history",
3358  .function = unix_cli_show_history,
3359 };
3360 /* *INDENT-ON* */
3361 
3362 /** CLI command to show terminal status. */
3363 static clib_error_t *
3365  unformat_input_t * input, vlib_cli_command_t * cmd)
3366 {
3367  unix_main_t *um = &unix_main;
3369  unix_cli_file_t *cf;
3370  vlib_node_t *n;
3371 
3373  n = vlib_get_node (vm, cf->process_node_index);
3374 
3375  vlib_cli_output (vm, "Terminal name: %v\n", n->name);
3376  vlib_cli_output (vm, "Terminal mode: %s\n", cf->line_mode ?
3377  "line-by-line" : "char-by-char");
3378  vlib_cli_output (vm, "Terminal width: %d\n", cf->width);
3379  vlib_cli_output (vm, "Terminal height: %d\n", cf->height);
3380  vlib_cli_output (vm, "ANSI capable: %s\n",
3381  cf->ansi_capable ? "yes" : "no");
3382  vlib_cli_output (vm, "Interactive: %s\n",
3383  cf->is_interactive ? "yes" : "no");
3384  vlib_cli_output (vm, "History enabled: %s%s\n",
3385  cf->has_history ? "yes" : "no", !cf->has_history
3386  || cf->history_limit ? "" :
3387  " (disabled by history limit)");
3388  if (cf->has_history)
3389  vlib_cli_output (vm, "History limit: %d\n", cf->history_limit);
3390  vlib_cli_output (vm, "Pager enabled: %s%s%s\n",
3391  cf->no_pager ? "no" : "yes",
3392  cf->no_pager
3393  || cf->height ? "" : " (disabled by terminal height)",
3394  cf->no_pager
3395  || um->cli_pager_buffer_limit ? "" :
3396  " (disabled by buffer limit)");
3397  if (!cf->no_pager)
3398  vlib_cli_output (vm, "Pager limit: %d\n", um->cli_pager_buffer_limit);
3399  vlib_cli_output (vm, "CRLF mode: %s\n",
3400  cf->crlf_mode ? "CR+LF" : "LF");
3401 
3402  return 0;
3403 }
3404 
3405 /*?
3406  * Displays various information about the state of the current terminal
3407  * session.
3408  *
3409  * @cliexpar
3410  * @cliexstart{show terminal}
3411  * Terminal name: unix-cli-stdin
3412  * Terminal mode: char-by-char
3413  * Terminal width: 123
3414  * Terminal height: 48
3415  * ANSI capable: yes
3416  * Interactive: yes
3417  * History enabled: yes
3418  * History limit: 50
3419  * Pager enabled: yes
3420  * Pager limit: 100000
3421  * CRLF mode: LF
3422  * @cliexend
3423 ?*/
3424 /* *INDENT-OFF* */
3425 VLIB_CLI_COMMAND (cli_unix_cli_show_terminal, static) = {
3426  .path = "show terminal",
3427  .short_help = "Show current session terminal settings",
3428  .function = unix_cli_show_terminal,
3429 };
3430 /* *INDENT-ON* */
3431 
3432 /** CLI command to display a list of CLI sessions. */
3433 static clib_error_t *
3435  unformat_input_t * input,
3436  vlib_cli_command_t * cmd)
3437 {
3440  unix_cli_file_t *cf;
3441  clib_file_t *uf;
3442  vlib_node_t *n;
3443 
3444  vlib_cli_output (vm, "%-5s %-5s %-20s %s", "PNI", "FD", "Name", "Flags");
3445 
3446 #define fl(x, y) ( (x) ? toupper((y)) : tolower((y)) )
3447  /* *INDENT-OFF* */
3448  pool_foreach (cf, cm->cli_file_pool, ({
3449  uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
3450  n = vlib_get_node (vm, cf->process_node_index);
3451  vlib_cli_output (vm,
3452  "%-5d %-5d %-20v %c%c%c%c%c\n",
3453  cf->process_node_index,
3454  uf->file_descriptor,
3455  n->name,
3456  fl (cf->is_interactive, 'i'),
3457  fl (cf->is_socket, 's'),
3458  fl (cf->line_mode, 'l'),
3459  fl (cf->has_epipe, 'p'),
3460  fl (cf->ansi_capable, 'a'));
3461  }));
3462  /* *INDENT-ON* */
3463 #undef fl
3464 
3465  return 0;
3466 }
3467 
3468 /*?
3469  * Displays a summary of all the current CLI sessions.
3470  *
3471  * Typically used to diagnose connection issues with the CLI
3472  * socket.
3473  *
3474  * @cliexpar
3475  * @cliexstart{show cli-sessions}
3476  * PNI FD Name Flags
3477  * 343 0 unix-cli-stdin IslpA
3478  * 344 7 unix-cli-local:20 ISlpA
3479  * 346 8 unix-cli-local:21 iSLpa
3480  * @cliexend
3481 
3482  * In this example we have the debug console of the running process
3483  * on stdin/out, we have an interactive socket session and we also
3484  * have a non-interactive socket session.
3485  *
3486  * Fields:
3487  *
3488  * - @em PNI: Process node index.
3489  * - @em FD: Unix file descriptor.
3490  * - @em Name: Name of the session.
3491  * - @em Flags: Various flags that describe the state of the session.
3492  *
3493  * @em Flags have the following meanings; lower-case typically negates
3494  * upper-case:
3495  *
3496  * - @em I Interactive session.
3497  * - @em S Connected by socket.
3498  * - @em s Not a socket, likely stdin.
3499  * - @em L Line-by-line mode.
3500  * - @em l Char-by-char mode.
3501  * - @em P EPIPE detected on connection; it will close soon.
3502  * - @em A ANSI-capable terminal.
3503 ?*/
3504 /* *INDENT-OFF* */
3505 VLIB_CLI_COMMAND (cli_unix_cli_show_cli_sessions, static) = {
3506  .path = "show cli-sessions",
3507  .short_help = "Show current CLI sessions",
3508  .function = unix_cli_show_cli_sessions,
3509 };
3510 /* *INDENT-ON* */
3511 
3512 /** CLI command to set terminal pager settings. */
3513 static clib_error_t *
3515  unformat_input_t * input,
3516  vlib_cli_command_t * cmd)
3517 {
3518  unix_main_t *um = &unix_main;
3520  unix_cli_file_t *cf;
3521  unformat_input_t _line_input, *line_input = &_line_input;
3522  clib_error_t *error = 0;
3523 
3525 
3526  if (!cf->is_interactive)
3527  return clib_error_return (0, "invalid for non-interactive sessions");
3528 
3529  if (!unformat_user (input, unformat_line_input, line_input))
3530  return 0;
3531 
3532  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3533  {
3534  if (unformat (line_input, "on"))
3535  cf->no_pager = 0;
3536  else if (unformat (line_input, "off"))
3537  cf->no_pager = 1;
3538  else if (unformat (line_input, "limit %u", &um->cli_pager_buffer_limit))
3539  vlib_cli_output (vm,
3540  "Pager limit set to %u lines; note, this is global.\n",
3542  else
3543  {
3544  error = clib_error_return (0, "unknown parameter: `%U`",
3545  format_unformat_error, line_input);
3546  goto done;
3547  }
3548  }
3549 
3550 done:
3551  unformat_free (line_input);
3552 
3553  return error;
3554 }
3555 
3556 /*?
3557  * Enables or disables the terminal pager for this session. Generally
3558  * this defaults to enabled.
3559  *
3560  * Additionally allows the pager buffer size to be set; though note that
3561  * this value is set globally and not per session.
3562 ?*/
3563 /* *INDENT-OFF* */
3564 VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_pager, static) = {
3565  .path = "set terminal pager",
3566  .short_help = "set terminal pager [on|off] [limit <lines>]",
3567  .function = unix_cli_set_terminal_pager,
3568 };
3569 /* *INDENT-ON* */
3570 
3571 /** CLI command to set terminal history settings. */
3572 static clib_error_t *
3574  unformat_input_t * input,
3575  vlib_cli_command_t * cmd)
3576 {
3578  unix_cli_file_t *cf;
3579  unformat_input_t _line_input, *line_input = &_line_input;
3580  u32 limit;
3581  clib_error_t *error = 0;
3582 
3584 
3585  if (!cf->is_interactive)
3586  return clib_error_return (0, "invalid for non-interactive sessions");
3587 
3588  if (!unformat_user (input, unformat_line_input, line_input))
3589  return 0;
3590 
3591  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
3592  {
3593  if (unformat (line_input, "on"))
3594  cf->has_history = 1;
3595  else if (unformat (line_input, "off"))
3596  cf->has_history = 0;
3597  else if (unformat (line_input, "limit %u", &cf->history_limit))
3598  ;
3599  else
3600  {
3601  error = clib_error_return (0, "unknown parameter: `%U`",
3602  format_unformat_error, line_input);
3603  goto done;
3604  }
3605 
3606  /* If we reduced history size, or turned it off, purge the history */
3607  limit = cf->has_history ? cf->history_limit : 0;
3608 
3609  while (cf->command_history && vec_len (cf->command_history) >= limit)
3610  {
3611  vec_free (cf->command_history[0]);
3612  vec_delete (cf->command_history, 1, 0);
3613  }
3614  }
3615 
3616 done:
3617  unformat_free (line_input);
3618 
3619  return error;
3620 }
3621 
3622 /*?
3623  * Enables or disables the command history function of the current
3624  * terminal. Generally this defaults to enabled.
3625  *
3626  * This command also allows the maximum size of the history buffer for
3627  * this session to be altered.
3628 ?*/
3629 /* *INDENT-OFF* */
3630 VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_history, static) = {
3631  .path = "set terminal history",
3632  .short_help = "set terminal history [on|off] [limit <lines>]",
3633  .function = unix_cli_set_terminal_history,
3634 };
3635 /* *INDENT-ON* */
3636 
3637 /** CLI command to set terminal ANSI settings. */
3638 static clib_error_t *
3640  unformat_input_t * input,
3641  vlib_cli_command_t * cmd)
3642 {
3644  unix_cli_file_t *cf;
3645 
3647 
3648  if (!cf->is_interactive)
3649  return clib_error_return (0, "invalid for non-interactive sessions");
3650 
3651  if (unformat (input, "on"))
3652  cf->ansi_capable = 1;
3653  else if (unformat (input, "off"))
3654  cf->ansi_capable = 0;
3655  else
3656  return clib_error_return (0, "unknown parameter: `%U`",
3657  format_unformat_error, input);
3658 
3659  return 0;
3660 }
3661 
3662 /*?
3663  * Enables or disables the use of ANSI control sequences by this terminal.
3664  * The default will vary based on terminal detection at the start of the
3665  * session.
3666  *
3667  * ANSI control sequences are used in a small number of places to provide,
3668  * for example, color text output and to control the cursor in the pager.
3669 ?*/
3670 /* *INDENT-OFF* */
3671 VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_ansi, static) = {
3672  .path = "set terminal ansi",
3673  .short_help = "set terminal ansi [on|off]",
3674  .function = unix_cli_set_terminal_ansi,
3675 };
3676 /* *INDENT-ON* */
3677 
3678 static clib_error_t *
3680 {
3681  return 0;
3682 }
3683 
3685 
3686 /*
3687  * fd.io coding-style-patch-verification: ON
3688  *
3689  * Local Variables:
3690  * eval: (c-set-style "gnu")
3691  * End:
3692  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
u32 history_limit
Maximum number of history entries this session will store.
Definition: cli.c:170
u32 command_number
Current command line counter.
Definition: cli.c:173
uword output_function_arg
Definition: node.h:610
u32 error_history_index
Definition: unix.h:68
unix_main_t unix_main
Definition: main.c:62
#define vec_foreach_index(var, v)
Iterate over vector indices.
u8 * format_clib_error(u8 *s, va_list *va)
Definition: error.c:191
static void clib_file_del(clib_file_main_t *um, clib_file_t *f)
Definition: file.h:109
static void unix_cli_ansi_cursor(unix_cli_file_t *cf, clib_file_t *uf, u16 x, u16 y)
Uses an ANSI escape sequence to move the cursor.
Definition: cli.c:838
#define UNIX_CLI_MAX_DEPTH_TELNET
Maximum depth into a byte stream from which to compile a Telnet protocol message. ...
Definition: cli.c:94
u32 flags
Definition: vhost_user.h:115
static clib_error_t * unix_cli_error_detected(clib_file_t *uf)
Called when a CLI session file descriptor has an error condition.
Definition: cli.c:2645
#define clib_min(x, y)
Definition: clib.h:295
u8 is_interactive
Whether the session is interactive or not.
Definition: cli.c:203
u32 pager_start
Line number of top of page.
Definition: cli.c:220
static void unix_vlib_cli_output_raw(unix_cli_file_t *cf, clib_file_t *uf, u8 *buffer, uword buffer_bytes)
Send a buffer to the CLI stream if possible, enqueue it otherwise.
Definition: cli.c:615
Action parser found a partial match.
Definition: cli.c:314
Carriage return, newline or enter.
Definition: cli.c:282
Telnet control code.
Definition: cli.c:300
Search forwards in command history.
Definition: cli.c:298
static u8 unix_cli_terminal_type_noninteractive(u8 *term, uword len)
Identify whether a terminal type is non-interactive.
Definition: cli.c:1170
unix_cli_process_event_type_t
CLI session events.
Definition: cli.c:448
a
Definition: bitmap.h:538
Exit the pager session.
Definition: cli.c:303
u8 * input_vector
Vector of input saved by Unix input node to be processed by CLI process.
Definition: cli.c:158
static void unix_cli_pager_message(unix_cli_file_t *cf, clib_file_t *uf, char *message, char *postfix)
Output a pager "skipping" message.
Definition: cli.c:800
static uword * vlib_process_wait_for_event(vlib_main_t *vm)
Definition: node_funcs.h:593
void vlib_cli_input(vlib_main_t *vm, unformat_input_t *input, vlib_cli_output_function_t *function, uword function_arg)
Definition: cli.c:725
static void unix_cli_del_pending_output(clib_file_t *uf, unix_cli_file_t *cf, uword n_bytes)
Delete all bytes from the output vector and flag the I/O system that no more bytes are available to b...
Definition: cli.c:558
static clib_error_t * unix_cli_show_terminal(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to show terminal status.
Definition: cli.c:3364
static uword vlib_current_process(vlib_main_t *vm)
Definition: node_funcs.h:400
#define CTL(c)
Given a capital ASCII letter character return a NUL terminated string with the control code for that ...
Definition: cli.c:338
static unix_cli_parse_action_t unix_cli_match_action(unix_cli_parse_actions_t *a, u8 *input, u32 ilen, i32 *matched)
Search for a byte sequence in the action list.
Definition: cli.c:500
u8 * line
The line to print.
Definition: cli.c:108
u32 flags
Definition: unix.h:58
u32 width
Terminal width.
Definition: cli.c:223
Erase cursor right.
Definition: cli.c:285
u8 * cli_prompt
Prompt string for CLI.
Definition: cli.c:458
#define UNIX_CLI_DEFAULT_TERMINAL_WIDTH
Default terminal width.
Definition: cli.c:103
static void unix_cli_set_session_noninteractive(unix_cli_file_t *cf)
Set a session to be non-interactive.
Definition: cli.c:1185
u32 cli_pager_buffer_limit
Definition: unix.h:97
static clib_error_t * unix_show_files(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to show various unix error statistics.
Definition: cli.c:3282
#define NULL
Definition: clib.h:58
u8 ** command_history
Array of vectors of commands in the history.
Definition: cli.c:163
static void unix_vlib_cli_output(uword cli_file_index, u8 *buffer, uword buffer_bytes)
VLIB CLI output function.
Definition: cli.c:1050
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
u32 index
Definition: node.h:279
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:255
void vlib_unix_cli_set_prompt(char *prompt)
Set the CLI prompt.
Definition: cli.c:3061
Scroll to last line.
Definition: cli.c:308
static void unix_cli_pager_redraw(unix_cli_file_t *cf, clib_file_t *uf)
Redraw the currently displayed page of text.
Definition: cli.c:854
struct termios tio_stdin
Definition: unix.h:103
static void unix_cli_file_free(unix_cli_file_t *f)
Release storage used by a CLI session.
Definition: cli.c:271
u32 file_descriptor
Definition: file.h:54
static u32 unix_cli_file_add(unix_cli_main_t *cm, char *name, int fd)
Store a new CLI session.
Definition: cli.c:2667
Scroll to first line.
Definition: cli.c:307
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:522
static clib_error_t * unix_cli_set_terminal_ansi(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to set terminal ANSI settings.
Definition: cli.c:3639
word any
Definition: types.h:139
Unix CLI session.
Definition: cli.c:148
unix_cli_pager_index_t * pager_index
Index of line fragments in the pager buffer.
Definition: cli.c:217
u8 * current_command
The command currently pointed at by the history cursor.
Definition: cli.c:165
int i
clib_error_t * clib_socket_init(clib_socket_t *s)
Definition: socket.c:384
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
#define VLIB_MAIN_LOOP_EXIT_CLI
Definition: main.h:111
#define vlib_call_config_function(vm, x)
Definition: init.h:294
void clib_longjmp(clib_longjmp_t *save, uword return_value)
static clib_error_t * unix_cli_listen_read_ready(clib_file_t *uf)
Telnet listening socket has a new connection.
Definition: cli.c:2756
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define UNIX_CLI_MAX_TERMINAL_WIDTH
Maximum terminal width we will accept.
Definition: cli.c:97
u8 data[128]
Definition: ipsec.api:248
u32 cursor
Position of the insert cursor on the current input line.
Definition: cli.c:184
clib_socket_t cli_listen_socket
Definition: unix.h:64
static unix_cli_parse_actions_t unix_cli_parse_pager[]
Patterns to match when a CLI session is in the pager.
Definition: cli.c:407
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
vlib_main_t ** vlib_mains
Definition: buffer.c:321
unix_cli_parse_action_t action
Action to take when matched.
Definition: cli.c:326
unsigned char u8
Definition: types.h:56
static clib_error_t * unix_cli_init(vlib_main_t *vm)
Definition: cli.c:3679
void unformat_init_clib_file(unformat_input_t *input, int file_descriptor)
Definition: unformat.c:1058
int log_fd
Definition: unix.h:85
Clear the terminal.
Definition: cli.c:296
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
double f64
Definition: types.h:142
#define vlib_worker_thread_barrier_sync(X)
Definition: threads.h:204
#define fm
#define clib_memcpy(d, s, n)
Definition: string.h:180
#define vec_add(V, E, N)
Add N elements to end of vector V (no header, unspecified alignment)
Definition: vec.h:598
#define CLIB_SOCKET_F_IS_SERVER
Definition: socket.h:58
clib_file_t * file_pool
Definition: file.h:88
u8 has_epipe
If EPIPE has been detected, prevent further write-related activity on the descriptor.
Definition: cli.c:211
u8 ansi_capable
Can we do ANSI output?
Definition: cli.c:193
u8 * format_timeval(u8 *s, va_list *args)
Definition: unix-formats.c:771
static void unix_cli_pager_reindex(unix_cli_file_t *cf)
Reindex entire pager buffer.
Definition: cli.c:977
A CLI session wants to close.
Definition: cli.c:451
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:493
i64 word
Definition: types.h:111
void vlib_worker_thread_node_runtime_update(void)
Definition: threads.c:1205
u8 * output_vector
Vector of output pending write to file descriptor.
Definition: cli.c:154
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
static uword vlib_process_get_events(vlib_main_t *vm, uword **data_vector)
Return the first event type which has occurred and a vector of per-event data of that type...
Definition: node_funcs.h:516
#define always_inline
Definition: clib.h:98
End key (jump to end of line)
Definition: cli.c:291
#define vec_new(T, N)
Create new vector of given type and length (unspecified alignment, no header).
Definition: vec.h:311
u8 is_socket
Whether the session is attached to a socket.
Definition: cli.c:206
Jump cursor to start of right word.
Definition: cli.c:293
Undo last erase action.
Definition: cli.c:299
u32 len
Length of input without final NUL.
Definition: cli.c:325
Mapping of input buffer strings to action values.
Definition: cli.c:322
vlib_parse_match_t vlib_parse_eval(u8 *input)
#define UNIX_CLI_DEFAULT_TERMINAL_HEIGHT
Default terminal height.
Definition: cli.c:101
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
#define clib_error_return(e, args...)
Definition: error.h:99
#define ANSI_SCROLLDN
ANSI scroll screen down one line.
Definition: cli.c:86
clib_file_main_t file_main
Definition: main.c:63
u32 process_node_index
Process node identifier.
Definition: cli.c:229
#define vec_resize(V, N)
Resize a vector (no header, unspecified alignment) Add N elements to end of given vector V...
Definition: vec.h:242
u32 offset
Offset of the string in the line.
Definition: cli.c:140
unsigned int u32
Definition: types.h:88
u32 length
Length of the string in the line.
Definition: cli.c:143
vlib_main_t * vlib_main
Definition: unix.h:56
Erase line to right & including cursor.
Definition: cli.c:295
#define ANSI_CLEARLINE
ANSI clear line cursor is on.
Definition: cli.c:84
static void unix_vlib_cli_output_cursor_left(unix_cli_file_t *cf, clib_file_t *uf)
Moves the terminal cursor one character to the left, with special handling when it reaches the left e...
Definition: cli.c:719
static i32 unix_cli_process_telnet(unix_main_t *um, unix_cli_file_t *cf, clib_file_t *uf, u8 *input_vector, uword len)
A mostly no-op Telnet state machine.
Definition: cli.c:1271
u32 * unused_cli_process_node_indices
Vec pool of unused session indices.
Definition: cli.c:464
static clib_error_t * unix_cli_quit(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to quit the terminal session.
Definition: cli.c:3075
static void unix_cli_pager_prompt(unix_cli_file_t *cf, clib_file_t *uf)
Output a pager prompt and show number of buffered lines.
Definition: cli.c:777
unformat_function_t unformat_line_input
Definition: format.h:282
unix_cli_file_t * cli_file_pool
Vec pool of CLI sessions.
Definition: cli.c:461
int search_mode
If non-zero then the CLI is searching in the history array.
Definition: cli.c:181
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
#define ANSI_RESTCURSOR
ANSI restore cursor position if previously saved.
Definition: cli.c:90
int cli_line_mode
Definition: unix.h:88
static void vlib_process_signal_event(vlib_main_t *vm, uword node_index, uword type_opaque, uword data)
Definition: node_funcs.h:934
clib_error_t * clib_socket_accept(clib_socket_t *server, clib_socket_t *client)
Definition: socket.c:524
static void unix_cli_pager_reset(unix_cli_file_t *f)
Resets the pager buffer and other data.
Definition: cli.c:250
Scroll to previous page.
Definition: cli.c:310
u8 ** vlib_cli_get_possible_completions(u8 *str)
Definition: cli.c:255
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
#define clib_error_return_unix(e, args...)
Definition: error.h:102
static u8 unix_cli_terminal_type_ansi(u8 *term, uword len)
Identify whether a terminal type is ANSI capable.
Definition: cli.c:1138
int cli_no_banner
Definition: unix.h:94
Home key (jump to start of line)
Definition: cli.c:290
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
static clib_error_t * unix_cli_read_ready(clib_file_t *uf)
Called when a CLI session file descriptor has data to be read.
Definition: cli.c:2606
#define ANSI_BOLD
ANSI Start bold text.
Definition: cli.c:76
static unix_cli_banner_t unix_cli_banner[]
Plain welcome banner.
Definition: cli.c:114
u32 flags
Definition: file.h:56
void timer_call(timer_func_t *func, any arg, f64 dt)
Definition: timer.c:163
static clib_error_t * unix_show_errors(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to show various unix error statistics.
Definition: cli.c:3207
#define VLIB_CONFIG_FUNCTION(x, n,...)
Definition: init.h:172
Search backwards in command history.
Definition: cli.c:297
u8 * input
Input string to match.
Definition: cli.c:324
void(* file_update)(clib_file_t *file, clib_file_update_type_t update_type)
Definition: file.h:90
u32 node_index
Node index.
Definition: node.h:494
u8 name[64]
Definition: memclnt.api:152
static void unix_cli_cli_prompt(unix_cli_file_t *cf, clib_file_t *uf)
Output the CLI prompt.
Definition: cli.c:766
u32 cli_history_limit
Definition: unix.h:91
u8 len
Definition: ip_types.api:49
Scroll to next page.
Definition: cli.c:304
Erase line to left of cursor.
Definition: cli.c:294
u8 * name
Definition: node.h:263
u8 * format_sockaddr(u8 *s, va_list *args)
Definition: unix-formats.c:239
#define CSI
ANSI Control Sequence Introducer.
Definition: cli.c:69
void unformat_init_vector(unformat_input_t *input, u8 *vector_string)
Definition: unformat.c:1031
u8 ** pager_vector
Pager buffer.
Definition: cli.c:214
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
unix_error_history_t error_history[128]
Definition: unix.h:67
svmdb_client_t * c
u32 runtime_index
Definition: node.h:282
vlib_main_t * vm
Definition: buffer.c:312
static void unix_vlib_cli_output_cooked(unix_cli_file_t *cf, clib_file_t *uf, u8 *buffer, uword buffer_bytes)
Process a buffer for CRLF handling before outputting it to the CLI.
Definition: cli.c:666
static unix_cli_banner_t unix_cli_banner_color[]
ANSI color welcome banner.
Definition: cli.c:123
u32 current_input_file_index
File pool index of current input.
Definition: cli.c:470
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
int cli_no_pager
Definition: unix.h:100
#define VLIB_MAIN_LOOP_EXIT_FUNCTION(x)
Definition: init.h:168
static clib_error_t * unix_cli_write_ready(clib_file_t *uf)
Called when a CLI session file descriptor can be written to without blocking.
Definition: cli.c:2564
#define ANSI_SAVECURSOR
ANSI save cursor position.
Definition: cli.c:88
static clib_error_t * unix_cli_set_terminal_history(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to set terminal history settings.
Definition: cli.c:3573
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:283
u32 line
Index into pager_vector.
Definition: cli.c:137
Down arrow.
Definition: cli.c:287
#define ARRAY_LEN(x)
Definition: clib.h:62
A file descriptor has data to be read.
Definition: cli.c:450
#define ESC
ANSI escape code.
Definition: cli.c:66
Jump cursor to start of left word.
Definition: cli.c:292
u8 no_pager
Disable the pager?
Definition: cli.c:199
int tio_isset
Definition: unix.h:104
Right arrow.
Definition: cli.c:289
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
Enter pressed (CR, CRLF, LF, etc)
Definition: cli.c:302
signed int i32
Definition: types.h:77
Up arrow.
Definition: cli.c:286
static void unix_cli_kill(unix_cli_main_t *cm, uword cli_file_index)
Destroy a CLI session.
Definition: cli.c:2485
#define vec_delete(V, N, M)
Delete N elements starting at element M.
Definition: vec.h:784
static word unix_vlib_findchr(u8 chr, u8 *str, word len)
A bit like strchr with a buffer length limit.
Definition: cli.c:588
unix_cli_parse_action_t
CLI actions.
Definition: cli.c:279
static uword clib_file_add(clib_file_main_t *um, clib_file_t *template)
Definition: file.h:96
u32 vlib_register_node(vlib_main_t *vm, vlib_node_registration_t *r)
Definition: node.c:520
#define UNIX_FLAG_INTERACTIVE
Definition: unix.h:60
Erase cursor left.
Definition: cli.c:284
static clib_error_t * unix_cli_set_terminal_pager(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to set terminal pager settings.
Definition: cli.c:3514
static clib_error_t * unix_cli_config(vlib_main_t *vm, unformat_input_t *input)
Handle configuration directives in the unix section.
Definition: cli.c:2887
#define vec_append(v1, v2)
Append v2 after v1.
Definition: vec.h:818
struct _socket_t clib_socket_t
static int unix_cli_line_process_one(unix_cli_main_t *cm, unix_main_t *um, unix_cli_file_t *cf, clib_file_t *uf, u8 input, unix_cli_parse_action_t action)
Process actionable input.
Definition: cli.c:1417
#define UNIX_FILE_DATA_AVAILABLE_TO_WRITE
Definition: file.h:57
Scroll to next page.
Definition: cli.c:309
static void vlib_node_set_state(vlib_main_t *vm, u32 node_index, vlib_node_state_t new_state)
Set node dispatch state.
Definition: node_funcs.h:148
u8 has_history
This session has command history.
Definition: cli.c:161
A CLI banner line.
Definition: cli.c:106
#define ANSI_CLEAR
ANSI clear screen.
Definition: cli.c:72
static clib_error_t * unix_cli_show_history(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to show session command history.
Definition: cli.c:3325
static void clib_socket_free(clib_socket_t *s)
Definition: socket.h:165
Pager line index.
Definition: cli.c:134
Action parser did not find any match.
Definition: cli.c:315
u8 started
Has the session started?
Definition: cli.c:196
struct _vlib_node_registration vlib_node_registration_t
clib_error_t * vlib_unix_recursive_mkdir(char *path)
Definition: util.c:103
Scroll to next line.
Definition: cli.c:305
clib_error_t * error
Definition: unix.h:50
CLI global state.
Definition: cli.c:455
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define ANSI_BRED
ANSI Start bright red text.
Definition: cli.c:82
u8 * search_key
The string being searched for in the history.
Definition: cli.c:176
u64 uword
Definition: types.h:112
static void unformat_free(unformat_input_t *i)
Definition: format.h:162
#define clib_unix_warning(format, args...)
Definition: error.h:68
u8 * format_time_interval(u8 *s, va_list *args)
Definition: std-formats.c:122
static uword unix_cli_process(vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)
Handle system events.
Definition: cli.c:2520
static void unix_cli_file_welcome(unix_cli_main_t *cm, unix_cli_file_t *cf)
Emit initial welcome banner and prompt on a connection.
Definition: cli.c:1197
static clib_error_t * unix_config(vlib_main_t *vm, unformat_input_t *input)
Definition: main.c:363
struct clib_bihash_value offset
template key/value backing page structure
static vlib_process_t * vlib_get_process_from_node(vlib_main_t *vm, vlib_node_t *node)
Definition: node_funcs.h:208
u8 * format_unformat_error(u8 *s, va_list *va)
Definition: unformat.c:91
void vlib_worker_thread_barrier_release(vlib_main_t *vm)
Definition: threads.c:1489
static void unix_cli_pager_prompt_erase(unix_cli_file_t *cf, clib_file_t *uf)
Erase the printed pager prompt.
Definition: cli.c:816
static void unix_cli_resize_interrupt(int signum)
The system terminal has informed us that the window size has changed.
Definition: cli.c:2847
Clear and redraw the page on the terminal.
Definition: cli.c:311
static int unix_cli_line_edit(unix_cli_main_t *cm, unix_main_t *um, clib_file_main_t *fm, unix_cli_file_t *cf)
Process input bytes on a stream to provide line editing and command history in the CLI...
Definition: cli.c:2281
static vlib_node_t * vlib_get_node(vlib_main_t *vm, u32 i)
Get vlib node by index.
Definition: node_funcs.h:59
#define vec_foreach(var, vec)
Vector iterator.
uword private_data
Definition: file.h:64
u8 cursor_direction
The current direction of cursor travel.
Definition: cli.c:242
u8 crlf_mode
Set if the CRLF mode wants CR + LF.
Definition: cli.c:190
static clib_error_t * unix_cli_exec(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to execute a VPP command script.
Definition: cli.c:3117
Definition: file.h:51
#define ANSI_RESET
ANSI reset color settings.
Definition: cli.c:74
clib_longjmp_t main_loop_exit
Definition: main.h:107
vlib_cli_output_function_t * output_function
Definition: node.h:609
u32 clib_file_index
The file index held by unix.c.
Definition: cli.c:151
static unix_cli_main_t unix_cli_main
CLI global state.
Definition: cli.c:474
#define CLIB_SOCKET_F_ALLOW_GROUP_WRITE
Definition: socket.h:62
i32 excursion
How far from the end of the history array the user has browsed.
Definition: cli.c:167
void vlib_start_process(vlib_main_t *vm, uword process_index)
Definition: main.c:1577
Search the pager buffer.
Definition: cli.c:312
u8 line_mode
Line mode or char mode.
Definition: cli.c:187
u32 length
The length of the line without terminating NUL.
Definition: cli.c:109
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
Left arrow.
Definition: cli.c:288
u32 stdin_cli_file_index
The session index of the stdin cli.
Definition: cli.c:467
static void unix_cli_add_pending_output(clib_file_t *uf, unix_cli_file_t *cf, u8 *buffer, uword buffer_bytes)
Add bytes to the output vector and then flagg the I/O system that bytes are available to be sent...
Definition: cli.c:538
static clib_error_t * unix_cli_show_cli_sessions(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
CLI command to display a list of CLI sessions.
Definition: cli.c:3434
static void unix_cli_pager_add_line(unix_cli_file_t *cf, u8 *line, word len_or_index)
Process and add a line to the pager index.
Definition: cli.c:915
#define clib_panic(format, args...)
Definition: error.h:72
#define UNIX_CLI_MAX_TERMINAL_HEIGHT
Maximum terminal height we will accept.
Definition: cli.c:99
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
Scroll to previous line.
Definition: cli.c:306
u64 n_total_errors
Definition: unix.h:69
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
u32 height
Terminal height.
Definition: cli.c:226
static clib_error_t * unix_cli_exit(vlib_main_t *vm)
Called when VPP is shutting down, this restores the system terminal state if previously saved...
Definition: cli.c:3042
static void unix_cli_file_welcome_timer(any arg, f64 delay)
A failsafe triggered on a timer to ensure we send the prompt to telnet sessions that fail to negotiat...
Definition: cli.c:1246
static void unix_cli_process_input(unix_cli_main_t *cm, uword cli_file_index)
Process input to a CLI session.
Definition: cli.c:2370
static unix_cli_parse_actions_t unix_cli_parse_strings[]
Patterns to match on a CLI input stream.
Definition: cli.c:345