/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "varattrs.h"
/*
* Tests for pcap_set_nonblock / pcap_get_nonblock:
* - idempotency
* - set/get are symmetric
* - get returns the same before/after activate
* - pcap_breakloop works after setting nonblock on and then off
*
* Really this is meant to
* be run manually under strace, to check for extra
* calls to eventfd or close.
*/
#include <pcap.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
static pcap_t *pd;
static char *program_name = "nonblocktest";
/* Forwards */
static void PCAP_NORETURN usage(void);
static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
/* VARARGS */
static void
error(const char *fmt, ...)
{
va_list ap;
(void)fprintf(stderr, "%s: ", program_name);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
if (*fmt) {
fmt += strlen(fmt);
if (fmt[-1] != '\n')
(void)fputc('\n', stderr);
}
exit(1);
/* NOTREACHED */
}
/* VARARGS */
static void
warning(const char *fmt, ...)
{
va_list ap;
(void)fprintf(stderr, "%s: WARNING: ", program_name);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
if (*fmt) {
fmt += strlen(fmt);
if (fmt[-1] != '\n')
(void)fputc('\n', stderr);
}
}
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s [ -i interface ]\n",
program_name);
exit(1);
}
static void
breakme(u_char *user _U_, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
{
warning("using pcap_breakloop()");
pcap_breakloop(pd);
}
int
main(int argc, char **argv)
{
int status, op, i, ret;
char *device;
pcap_if_t *devlist;
char ebuf[PCAP_ERRBUF_SIZE];
device = NULL;
while ((op = getopt(argc, argv, "i:sptnq")) != -1) {
switch (op) {
case 'i':
device = optarg;
break;
default:
usage();
/* NOTREACHED */
}
}
if (device == NULL) {
if (pcap_findalldevs(&devlist, ebuf) == -1)
error("%s", ebuf);
if (devlist == NULL)
error("no interfaces available for capture");
device = strdup(devlist->name);
warning("listening on %s", device);
pcap_freealldevs(devlist);
}
*ebuf = '\0';
pd = pcap_create(device, ebuf);
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
warning("%s", ebuf);
/* set nonblock before activate */
if (pcap_setnonblock(pd, 1, ebuf) < 0)
error("pcap_setnonblock failed: %s", ebuf);
/* getnonblock just returns "not activated yet" */
ret = pcap_getnonblock(pd, ebuf);
if (ret != PCAP_ERROR_NOT_ACTIVATED)
error("pcap_getnonblock unexpectedly succeeded");
if ((status = pcap_activate(pd)) < 0)
error("pcap_activate failed");
ret = pcap_getnonblock(pd, ebuf);
if (ret != 1)
error( "pcap_getnonblock did not return nonblocking" );
/* Set nonblock multiple times, ensure with strace that it's a noop */
for (i=0; i<10; i++) {
if (pcap_setnonblock(pd, 1, ebuf) < 0)
error("pcap_setnonblock failed: %s", ebuf);
ret = pcap_getnonblock(pd, ebuf);
if (ret != 1)
error( "pcap_getnonblock did not return nonblocking" );
}
/* Set block multiple times, ensure with strace that it's a noop */
for (i=0; i<10; i++) {
if (pcap_setnonblock(pd, 0, ebuf) < 0)
error("pcap_setnonblock failed: %s", ebuf);
ret = pcap_getnonblock(pd, ebuf);
if (ret != 0)
error( "pcap_getnonblock did not return blocking" );
}
/* Now pcap_loop forever, with a callback that
* uses pcap_breakloop to get out of forever */
pcap_loop(pd, -1, breakme, NULL);
/* Now test that pcap_setnonblock fails if we can't open the
* eventfd. */
if (pcap_setnonblock(pd, 1, ebuf) < 0)
error("pcap_setnonblock failed: %s", ebuf);
while (1) {
ret = open("/dev/null", O_RDONLY);
if (ret < 0)
break;
}
ret = pcap_setnonblock(pd, 0, ebuf);
if (ret == 0)
error("pcap_setnonblock succeeded even though file table is full");
else
warning("pcap_setnonblock failed as expected: %s", ebuf);
}
