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Patch for reading PCAP files writed on device with different endianess #17

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Patch for reading PCAP files writed on device with different endianess #17

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99 changes: 66 additions & 33 deletions cli/cli_send.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,9 @@
#include <arpa/inet.h>
#include <fcntl.h>

#include <endian.h>
#include <errno.h>

#define PCAP_MAGIC 0xa1b2c3d4
#ifndef MAX_MTU
#define MAX_MTU 9000
Expand Down Expand Up @@ -1358,61 +1361,91 @@ int interface_setup()
}

/*------------------------------------------------------------------------------*/
int read_packet_from_file(char *filename) {
int read_packet_from_file(char *filename)
{
int little_endian = 0;
int big_endian = 0;

FILE *file_p;
FILE * file_p;
int freads;
//int last=0
int i=0;
//char *ptr2;
int i = 0;

if((file_p = fopen(filename, "r")) == NULL) {
if ((file_p = fopen(filename, "r")) == NULL)
{
printf("\nCan not open file for reading. Did you specify pcap file with option -f ?\n\n");
exit(7);
}

/* first we read the pcap file header */
freads = fread(params1.pkt_temp, sizeof(params1.fh), 1, file_p);
freads = fread(&params1.fh, sizeof(params1.fh), 1, file_p);
/* if EOF, exit */
if (freads == 0) {
printf("\nPcap file not correct?\n\n");
if (freads == 0)
{
printf("\nCan't read pcap file header\n\n");
exit(7);
}

memcpy(&params1.fh, params1.pkt_temp, 24);

if (be32toh(params1.fh.magic) == PCAP_MAGIC)
{
printf("\nPCAP file writed in BE\n");
big_endian = 1;
}
else if (le32toh(params1.fh.magic) == PCAP_MAGIC)
{
printf("\nPCAP file writed in LE\n");
little_endian = 1;
}
/* if magic number in NOK, exit */
if (params1.fh.magic != PCAP_MAGIC) {
printf("\nWrong pcap file format?\n\n");
else if (params1.fh.magic != PCAP_MAGIC)
{
printf("\nPCAP magic sequence incorrect, file magic = %u, pcap magic = %u \n\n", params1.fh.magic, PCAP_MAGIC);
exit(7);
}

// we can select which packet we want to send
if (params1.seqnum == -2)
params1.seqnum = 1;
for (i=0; i < params1.seqnum; i++) {
/* next the pcap packet header */
freads = fread(params1.pkt_temp, sizeof(params1.ph), 1, file_p);

/* if EOF, exit */
if (freads == 0) {
printf("\nWrong sequence number? Or wrong pcap file format?\n\n");
exit(7);

for (i = 0; i < params1.seqnum; i++)
{
/* next the pcap packet header */
freads = fread(&params1.ph, sizeof(params1.ph), 1, file_p);
/* if EOF, exit */
if (freads == 0)
{
printf("\nCan't read pcap record header for packet %d in pcap file (%s)\n\n", i, strerror(errno));
exit(7);
}
else
{
if (little_endian)
{
params1.ph.ts_sec = le32toh(params1.ph.ts_sec);
params1.ph.ts_usec = le32toh(params1.ph.ts_usec);
params1.ph.incl_len = le32toh(params1.ph.incl_len);
params1.ph.orig_len = le32toh(params1.ph.orig_len);
}

/* copy the 16 bytes into ph structure */
memcpy(&params1.ph, params1.pkt_temp, 16);
params1.ptr = params1.pkt_temp + sizeof(params1.ph);

/* and the packet itself, but only up to the capture length */
freads = fread(params1.ptr, params1.ph.incl_len, 1, file_p);

/* if EOF, exit */
if (freads == 0) {
printf("\nWrong sequence number? Or wrong pcap file format?\n\n");
exit(7);
else if (big_endian)
{
params1.ph.ts_sec = be32toh(params1.ph.ts_sec);
params1.ph.ts_usec = be32toh(params1.ph.ts_usec);
params1.ph.incl_len = be32toh(params1.ph.incl_len);
params1.ph.orig_len = be32toh(params1.ph.orig_len);
}
}

params1.ptr = params1.pkt_temp;

/* and the packet itself, but only up to the capture length */
freads = fread(params1.ptr, params1.ph.incl_len, 1, file_p);
/* if EOF, exit */
if (freads == 0)
{
printf("\nCan't read packet with len %u from pcap file\n\n", params1.ph.incl_len);
exit(7);
}
}

fclose(file_p);

return 1;
Expand Down