[ar71xx] fix dir-825-b1 default network config after r21905
[openwrt.git] / package / wprobe / src / filter / pfc.c
1 #include <arpa/inet.h>
2 #include <sys/types.h>
3 #include <sys/time.h>
4 #include <string.h>
5 #include <stdint.h>
6 #include <stdlib.h>
7
8 #include <pcap.h>
9 #include <pcap-bpf.h>
10
11 struct wprobe_filter_hdr {
12 char name[32];
13 uint32_t len;
14 } hdr;
15
16 int main (int argc, char ** argv)
17 {
18 struct bpf_program filter;
19 pcap_t *pc;
20 int i;
21
22 if (argc != 3)
23 {
24 fprintf(stderr, "Usage: %s <name> <expression>\n", argv[0]);
25 return 1;
26 }
27
28 pc = pcap_open_dead(DLT_IEEE802_11_RADIO, 256);
29 if (pcap_compile(pc, &filter, argv[2], 1, 0) != 0)
30 {
31 pcap_perror(pc, argv[0]);
32 exit(1);
33 }
34
35 /* fix up for linux */
36 for (i = 0; i < filter.bf_len; i++) {
37 struct bpf_insn *bi = &filter.bf_insns[i];
38 switch(BPF_CLASS(bi->code)) {
39 case BPF_RET:
40 if (BPF_MODE(bi->code) == BPF_K) {
41 if (bi->k != 0)
42 bi->k = 65535;
43 }
44 break;
45 }
46 bi->code = ntohs(bi->code);
47 bi->k = ntohl(bi->k);
48 }
49
50 memset(&hdr, 0, sizeof(hdr));
51 strncpy(hdr.name, argv[1], sizeof(hdr.name));
52 hdr.len = htonl(filter.bf_len);
53 fwrite(&hdr, sizeof(hdr), 1, stdout);
54 fwrite(filter.bf_insns, 8, filter.bf_len, stdout);
55 fflush(stdout);
56
57 return 0;
58 }
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