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Added bpf filter option to kismet_cap_linux_wifi #273

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Added bpf filter option to kismet_cap_linux_wifi #273

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6 changes: 5 additions & 1 deletion capture_framework.c
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Original file line number Diff line number Diff line change
Expand Up @@ -727,6 +727,7 @@ int cf_handler_parse_opts(kis_capture_handler_t *caph, int argc, char *argv[]) {
{ "fixed-gps", required_argument, 0, 8},
{ "gps-name", required_argument, 0, 9},
{ "host", required_argument, 0, 10},
{ "bpf", required_argument, 0, 11},
{ "help", no_argument, 0, 'h'},
{ 0, 0, 0, 0 }
};
Expand Down Expand Up @@ -786,6 +787,8 @@ int cf_handler_parse_opts(kis_capture_handler_t *caph, int argc, char *argv[]) {
caph->remote_host = strdup(parse_hname);
caph->remote_port = parse_port;
caph->reverse_server = 1;
} else if (r == 11) {
caph->bpf = strdup(optarg);
}
}

Expand Down Expand Up @@ -866,7 +869,8 @@ void cf_print_help(kis_capture_handler_t *caph, const char *argv0) {
" --gps-name [name] Set an alternate GPS name for this source\n"
" --daemonize Background the capture tool and enter daemon\n"
" mode.\n"
" --list List supported devices detected\n",
" --list List supported devices detected\n"
" --bpf [filter] Berkeley Packet Filter\n",
argv0, argv0);
}

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3 changes: 3 additions & 0 deletions capture_framework.h
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Original file line number Diff line number Diff line change
Expand Up @@ -346,6 +346,9 @@ struct kis_capture_handler {

/* Fixed GPS name */
char *gps_name;

/* bpf filter */
char *bpf;
};


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14 changes: 14 additions & 0 deletions capture_linux_wifi/capture_linux_wifi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2427,6 +2427,20 @@ int open_callback(kis_capture_handler_t *caph, uint32_t seqno, char *definition,

free(filter_targets);
}
} else if ((caph->bpf != NULL && caph->bpf[0] != '\0')) {
if (pcap_compile(local_wifi->pd, &bpf, caph->bpf, 0, 0) < 0) {
snprintf(errstr, STATUS_MAX, "%s unable to compile bpf filter "
": %s",
local_wifi->name, pcap_geterr(local_wifi->pd));
cf_send_message(caph, errstr, MSGFLAG_INFO);
} else {
if (pcap_setfilter(local_wifi->pd, &bpf) < 0) {
snprintf(errstr, STATUS_MAX, "%s unable to assign bpf filter "
": %s",
local_wifi->name, pcap_geterr(local_wifi->pd));
cf_send_message(caph, errstr, MSGFLAG_INFO);
}
}
}

local_wifi->datalink_type = pcap_datalink(local_wifi->pd);
Expand Down