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Use pcap_setdirection instead of filter

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This commit is contained in:
Joseph C. Lehner 2017-02-23 18:38:15 +01:00
parent 6ed895d4c7
commit 590e7a079f
1 changed files with 11 additions and 6 deletions
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17
ethsock.c
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@ -345,7 +345,7 @@ inline uint8_t *ethsock_get_hwaddr(struct ethsock *sock)
struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
{
char buf[PCAP_ERRBUF_SIZE];
struct bpf_program fp;
struct bpf_program bpf;
struct ethsock *sock;
bool is_bridge;
int err;
@ -412,17 +412,22 @@ struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
}
#endif
snprintf(buf, sizeof(buf), "ether proto 0x%04x and not ether src %s",
protocol, mac_to_str(sock->hwaddr));
err = pcap_setdirection(sock->pcap, PCAP_D_IN);
if (err) {
pcap_perror(sock->pcap, "pcap_setdirection");
goto cleanup;
}
err = pcap_compile(sock->pcap, &fp, buf, 0, 0);
snprintf(buf, sizeof(buf), "ether proto 0x%04x", protocol);
err = pcap_compile(sock->pcap, &bpf, buf, 0, 0);
if (err) {
pcap_perror(sock->pcap, "pcap_compile");
goto cleanup;
}
err = pcap_setfilter(sock->pcap, &fp);
pcap_freecode(&fp);
err = pcap_setfilter(sock->pcap, &bpf);
pcap_freecode(&bpf);
if (err) {
pcap_perror(sock->pcap, "pcap_setfilter");