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Rectifies incorrect use of va_start/va_end from stdarg.h. Closes #1297

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nnposter
2018-08-09 22:11:15 +00:00
parent 0c617b26d9
commit 302954fb3f
4 changed files with 22 additions and 12 deletions
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6
libnetutil/netutil.cc
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@@ -4138,13 +4138,15 @@ pcap_t *my_pcap_open_live(const char *device, int snaplen, int promisc, int to_m
/* Set a pcap filter */
void set_pcap_filter(const char *device, pcap_t *pd, const char *bpf, ...) {
va_list ap;
int size;
char buf[3072];
struct bpf_program fcode;
va_start(ap, bpf);
if (Vsnprintf(buf, sizeof(buf), bpf, ap) >= (int) sizeof(buf))
netutil_fatal("%s called with too-large filter arg\n", __func__);
size = Vsnprintf(buf, sizeof(buf), bpf, ap);
va_end(ap);
if (size >= (int) sizeof(buf))
netutil_fatal("%s called with too-large filter arg\n", __func__);
if (pcap_compile(pd, &fcode, buf, 1, PCAP_NETMASK_UNKNOWN) < 0)
netutil_fatal("Error compiling our pcap filter: %s", pcap_geterr(pd));