fluffy/puniq.c

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C
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#include <stdio.h>
#include <sysexits.h>
#include <string.h>
#include "pcap.h"
int
main(int argc, char *argv[])
{
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int i;
struct pcap_pkthdr hdr[2];
char frame[2][MAXFRAME];
int cur = 0;
struct pcap_file out;
memset(&hdr, 0, sizeof(hdr));
memset(frame, 0, 2 * MAXFRAME);
if (-1 == pcap_open_out(&out, stdout)) {
perror("writing header");
return EX_IOERR;
}
i = 1;
do {
char *fn = argv[i];
FILE *f;
struct pcap_file p;
if ((!fn) || (0 == strcmp("-", fn))) {
f = stdin;
} else {
f = fopen(fn, "rb");
if (NULL == f) {
perror(fn);
return EX_IOERR;
}
}
if (-1 == pcap_open_in(&p, f)) {
fprintf(stderr, "%s: unable to process\n", fn);
return EX_IOERR;
}
while (1) {
if (-1 == pcap_read_pkthdr(&p, &hdr[cur]))
break;
if (1 != fread(frame[cur], hdr[cur].caplen, 1, p.f))
break;
if ((0 == memcmp(&hdr[0], &hdr[1], sizeof(hdr[0]))) && (0 == memcmp(frame[0], frame[1], hdr[cur].caplen))) {
/*
* Skip this duplicate
*/
} else {
if (-1 == pcap_write_pkthdr(&out, &hdr[cur]))
break;
if (1 != fwrite(frame[cur], hdr[cur].caplen, 1, out.f))
break;
}
cur = (1 - cur);
}
pcap_close(&p);
i += 1;
} while (i < argc);
return 0;
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}