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/*
* pcap2pg.c: convert pcap input to pg input
*
* Copyright (c) 2013 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief Functions to convert PCAP file format to VPP PG (Packet Generator)
*
*/
#include <vnet/unix/pcap.h>
#include <vnet/ethernet/packet.h>
#include <stdio.h>
pcap_main_t pcap_main;
/**
* @brief char * to seed a PG file
*/
static char *pg_fmt =
"packet-generator new {\n"
" name s%d\n"
" limit 1\n" " size %d-%d\n" " node ethernet-input\n";
/**
* @brief Packet Generator Stream boilerplate
*
* @param *ofp - FILE
* @param i - int
* @param *pkt - u8
*/
void
stream_boilerplate (FILE * ofp, int i, u8 * pkt)
{
fformat (ofp, pg_fmt, i, vec_len (pkt), vec_len (pkt));
}
/**
* @brief Conversion of PCAP file to PG file format
*
* @param *pm - pcap_main_t
* @param *ofp - FILE
*
* @return rc - int
*
*/
int
pcap2pg (pcap_main_t * pm, FILE * ofp)
{
int i, j;
u8 *pkt;
for (i = 0; i < vec_len (pm->packets_read); i++)
{
int offset;
ethernet_header_t *h;
u64 ethertype;
pkt = pm->packets_read[i];
h = (ethernet_header_t *) pkt;
stream_boilerplate (ofp, i, pkt);
fformat (ofp, " data {\n");
ethertype = clib_net_to_host_u16 (h->type);
/**
* In vnet terms, packet generator interfaces are not ethernets.
* They don't have vlan tables.
* This transforms captured 802.1q VLAN packets into
* regular Ethernet packets.
*/
if (ethertype == 0x8100 /* 802.1q vlan */ )
{
u16 *vlan_ethertype = (u16 *) (h + 1);
ethertype = clib_net_to_host_u16 (vlan_ethertype[0]);
offset = 18;
}
else
offset = 14;
fformat (ofp,
" 0x%04x: %02x%02x.%02x%02x.%02x%02x"
" -> %02x%02x.%02x%02x.%02x%02x\n",
ethertype,
h->src_address[0],
h->src_address[1],
h->src_address[2],
h->src_address[3],
h->src_address[4],
h->src_address[5],
h->dst_address[0],
h->dst_address[1],
h->dst_address[2],
h->dst_address[3], h->dst_address[4], h->dst_address[5]);
fformat (ofp, " hex 0x");
for (j = offset; j < vec_len (pkt); j++)
fformat (ofp, "%02x", pkt[j]);
fformat (ofp, " }\n");
fformat (ofp, "}\n\n");
}
return 0;
}
/**
* @brief pcap2pg.
* usage: pcap2pg -i <input-file> [-o <output-file>]
*/
int
main (int argc, char **argv)
{
unformat_input_t input;
pcap_main_t *pm = &pcap_main;
u8 *input_file = 0, *output_file = 0;
FILE *ofp;
clib_error_t *error;
unformat_init_command_line (&input, argv);
while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (&input, "-i %s", &input_file)
|| unformat (&input, "input %s", &input_file))
;
else if (unformat (&input, "-o %s", &output_file)
|| unformat (&input, "output %s", &output_file))
;
else
{
usage:
fformat (stderr,
"usage: pcap2pg -i <input-file> [-o <output-file>]\n");
exit (1);
}
}
if (input_file == 0)
goto usage;
pm->file_name = (char *) input_file;
error = pcap_read (pm);
if (error)
{
clib_error_report (error);
exit (1);
}
if (output_file)
{
ofp = fopen ((char *) output_file, "w+");
if (ofp == NULL)
clib_unix_warning ("Couldn't create '%s'", output_file);
exit (1);
}
else
{
ofp = stdout;
}
pcap2pg (pm, ofp);
fclose (ofp);
exit (0);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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