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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2013 Daniel Borkmann.
* Subject to the GPL, version 2.
*/
#include <pcap.h>
#include <linux/filter.h>
#include "xmalloc.h"
#include "bpf.h"
#include "die.h"
void bpf_try_compile(const char *rulefile, struct sock_fprog *bpf, uint32_t link_type)
{
int i, ret;
const struct bpf_insn *ins;
struct sock_filter *out;
struct bpf_program _bpf;
ret = pcap_compile_nopcap(65535, link_type, &_bpf, rulefile, 1, 0xffffffff);
if (ret < 0)
panic("Cannot compile filter %s\n", rulefile);
bpf->len = _bpf.bf_len;
bpf->filter = xrealloc(bpf->filter, 1, bpf->len * sizeof(*out));
for (i = 0, ins = _bpf.bf_insns, out = bpf->filter; i < bpf->len;
++i, ++ins, ++out) {
out->code = ins->code;
out->jt = ins->jt;
out->jf = ins->jf;
out->k = ins->k;
if (out->code == 0x06 && out->k > 0)
out->k = 0xFFFFFFFF;
}
pcap_freecode(&_bpf);
if (__bpf_validate(bpf) == 0)
panic("This is not a valid BPF program!\n");
}
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