FD.io VPP  v17.01.1-3-gc6833f8
Vector Packet Processing
pcap2pg.c
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1 /*
2  * pcap2pg.c: convert pcap input to pg input
3  *
4  * Copyright (c) 2013 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 /**
18  * @file
19  * @brief Functions to convert PCAP file format to VPP PG (Packet Generator)
20  *
21  */
22 #include <vnet/unix/pcap.h>
23 #include <vnet/ethernet/packet.h>
24 #include <stdio.h>
25 
27 
28 /**
29  * @brief char * to seed a PG file
30  */
31 static char * pg_fmt =
32  "packet-generator new {\n"
33  " name s%d\n"
34  " limit 1\n"
35  " size %d-%d\n"
36  " node ethernet-input\n";
37 
38 
39 /**
40  * @brief Packet Generator Stream boilerplate
41  *
42  * @param *ofp - FILE
43  * @param i - int
44  * @param *pkt - u8
45  */
46 void stream_boilerplate (FILE *ofp, int i, u8 * pkt)
47 {
48  fformat(ofp, pg_fmt, i, vec_len(pkt), vec_len(pkt));
49 }
50 
51 /**
52  * @brief Conversion of PCAP file to PG file format
53  *
54  * @param *pm - pcap_main_t
55  * @param *ofp - FILE
56  *
57  * @return rc - int
58  *
59  */
60 int pcap2pg (pcap_main_t * pm, FILE *ofp)
61 {
62  int i, j;
63  u8 *pkt;
64 
65  for (i = 0; i < vec_len (pm->packets_read); i++)
66  {
67  int offset;
69  u64 ethertype;
70 
71  pkt = pm->packets_read[i];
72  h = (ethernet_header_t *)pkt;
73 
74  stream_boilerplate (ofp, i, pkt);
75 
76  fformat (ofp, " data {\n");
77 
78  ethertype = clib_net_to_host_u16 (h->type);
79 
80  /**
81  * In vnet terms, packet generator interfaces are not ethernets.
82  * They don't have vlan tables.
83  * This transforms captured 802.1q VLAN packets into
84  * regular Ethernet packets.
85  */
86  if (ethertype == 0x8100 /* 802.1q vlan */)
87  {
88  u16 * vlan_ethertype = (u16 *)(h+1);
89  ethertype = clib_net_to_host_u16(vlan_ethertype[0]);
90  offset = 18;
91  }
92  else
93  offset = 14;
94 
95  fformat (ofp,
96  " 0x%04x: %02x%02x.%02x%02x.%02x%02x"
97  " -> %02x%02x.%02x%02x.%02x%02x\n",
98  ethertype,
99  h->src_address[0],
100  h->src_address[1],
101  h->src_address[2],
102  h->src_address[3],
103  h->src_address[4],
104  h->src_address[5],
105  h->dst_address[0],
106  h->dst_address[1],
107  h->dst_address[2],
108  h->dst_address[3],
109  h->dst_address[4],
110  h->dst_address[5]);
111 
112  fformat (ofp, " hex 0x");
113 
114  for (j = offset; j < vec_len (pkt); j++)
115  fformat (ofp, "%02x", pkt[j]);
116 
117  fformat (ofp, " }\n");
118  fformat (ofp, "}\n\n");
119  }
120  return 0;
121 }
122 
123 /**
124  * @brief pcap2pg.
125  * usage: pcap2pg -i <input-file> [-o <output-file>]
126  */
127 int main (int argc, char **argv)
128 {
129  unformat_input_t input;
130  pcap_main_t * pm = &pcap_main;
131  u8 * input_file = 0, * output_file = 0;
132  FILE * ofp;
133  clib_error_t * error;
134 
135  unformat_init_command_line (&input, argv);
136 
137  while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
138  {
139  if (unformat(&input, "-i %s", &input_file)
140  || unformat (&input, "input %s", &input_file))
141  ;
142  else if (unformat (&input, "-o %s", &output_file)
143  || unformat (&input, "output %s", &output_file))
144  ;
145  else
146  {
147  usage:
148  fformat(stderr,
149  "usage: pcap2pg -i <input-file> [-o <output-file>]\n");
150  exit (1);
151  }
152  }
153 
154  if (input_file == 0)
155  goto usage;
156 
157  pm->file_name = (char *)input_file;
158  error = pcap_read (pm);
159 
160  if (error)
161  {
162  clib_error_report (error);
163  exit (1);
164  }
165 
166  if (output_file)
167  {
168  ofp = fopen ((char *)output_file, "rw");
169  if (ofp == NULL)
170  clib_unix_warning ("Couldn't create '%s'", output_file);
171  exit (1);
172  }
173  else
174  {
175  ofp = stdout;
176  }
177 
178  pcap2pg (pm, ofp);
179 
180  fclose (ofp);
181  exit (0);
182 }
char * file_name
File name of pcap output.
Definition: pcap.h:124
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
uword unformat(unformat_input_t *i, char *fmt,...)
Definition: unformat.c:966
#define UNFORMAT_END_OF_INPUT
Definition: format.h:143
#define NULL
Definition: clib.h:55
PCAP utility definitions.
u8 src_address[6]
Definition: packet.h:54
static void usage(void)
Definition: health_check.c:14
#define clib_error_report(e)
Definition: error.h:125
PCAP main state data structure.
Definition: pcap.h:122
u8 dst_address[6]
Definition: packet.h:53
int main(int argc, char **argv)
pcap2pg.
Definition: pcap2pg.c:127
unsigned long u64
Definition: types.h:89
void stream_boilerplate(FILE *ofp, int i, u8 *pkt)
Packet Generator Stream boilerplate.
Definition: pcap2pg.c:46
void unformat_init_command_line(unformat_input_t *input, char *argv[])
Definition: unformat.c:1001
clib_error_t * pcap_read(pcap_main_t *pm)
Read PCAP file.
Definition: pcap.c:170
#define clib_unix_warning(format, args...)
Definition: error.h:68
int pcap2pg(pcap_main_t *pm, FILE *ofp)
Conversion of PCAP file to PG file format.
Definition: pcap2pg.c:60
unsigned short u16
Definition: types.h:57
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
word fformat(FILE *f, char *fmt,...)
Definition: format.c:452
struct clib_bihash_value offset
template key/value backing page structure
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:169
static char * pg_fmt
char * to seed a PG file
Definition: pcap2pg.c:31
u8 ** packets_read
Packets read from file.
Definition: pcap.h:149
struct _unformat_input_t unformat_input_t
pcap_main_t pcap_main
Definition: pcap2pg.c:26