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master
testprogs/activatetest.c
56 строк
2 KB
Guy Harris
Free p->opt.device on close, not on cleanup.
03 фев 2026, 23:26
03 фев 2026, 23:26
b8d160a
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#include <stdio.h> #include <pcap.h> #define CAPTURE_DEVICE "nosuchdevice" int main(void) { /* * When trying to use libpcap on a device that does not exist, the * expected behaviour is that pcap_create() does not return an error, * and pcap_activate() does return an error, and the error code * specifically tells that the interface does not exist. tcpdump * depends on this semantics to accept integer indices instead of * device names. This test provides means to verify the actual * behaviour, which is specific to each libpcap module. */ char errbuf[PCAP_ERRBUF_SIZE]; printf("Trying to use capture device \"%s\"...\n", CAPTURE_DEVICE); pcap_t *p = pcap_create(CAPTURE_DEVICE, errbuf); if (! p) { fprintf(stderr, "FAIL: Unexpected error from pcap_create() (%s).\n", errbuf); return 1; } int ret = 1, err = pcap_activate(p); switch (err) { case 0: fprintf(stderr, "FAIL: No error from pcap_activate().\n"); break; case PCAP_ERROR: fprintf(stderr, "FAIL: Generic error from pcap_activate().\n"); break; case PCAP_ERROR_PERM_DENIED: fprintf(stderr, "FAIL: Permission denied from pcap_activate(), " "retry with higher privileges.\n"); break; case PCAP_ERROR_NO_SUCH_DEVICE: printf("PASS: Correct specific error from pcap_activate().\n"); ret = 0; break; default: fprintf(stderr, "FAIL: Unexpected error %d from pcap_activate().\n", err); } /* * And attempts to determine whether attributes can be set * on the pcap_t shouldn't crash after a failed activate. * See GitHub issue #1615. */ (void) pcap_can_set_rfmon(p); pcap_close(p); return ret; }