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#include <pcap.h>
#include <pcap-bpf.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "pppd.h"
int pcap_pre_compiled (char * fname, struct bpf_program *p)
{
char buf[128];
int line = 0, size = 0, index=0, ret=1;
FILE *f = fopen (fname, "r");
if (!f)
{
option_error("error opening precompiled active-filter '%s': %s",
fname, strerror (errno));
return 0;
}
while (fgets (buf, 127, f))
{
line++;
if (*buf == '#')
continue;
if (size)
{
/*
struct bpf_insn {
u_short code;
u_char jt;
u_char jf;
bpf_int32 k;
}
*/
struct bpf_insn * insn = & p->bf_insns[index];
unsigned code, jt, jf, k;
if (sscanf (buf, "%u %u %u %u", &code, &jt, &jf, &k) != 4)
{
goto err;
}
insn->code = code;
insn->jt = jt;
insn->jf = jf;
insn->k = k;
index++;
}
else
{
if (sscanf (buf, "%u", &size) != 1)
{
goto err;
}
p->bf_len = size;
p->bf_insns = (struct bpf_insn *)
malloc (size * sizeof (struct bpf_insn));
}
}
if (size != index)
{
option_error("error in precompiled active-filter,"
" expected %d expressions, got %dn",
size, index);
ret = 0;
}
fclose(f);
return ret;
err:
option_error("error in precompiled active-filter"
" expression line %s:%d (wrong size)\n",
fname, line);
fclose (f);
return 0;
}
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