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/* $Id$ */
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
/* Regression test for Avahi bug #84.
* This program tests whether the avahi_dns_packet_consume_name function
* returns (rather than spinning forever). For a function as simple as
* avahi_dns_packet_consume_name, we assume that 1 second of CPU time ≈ forever
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
#include "dns.h"
#define MAX_CPU_SECONDS 1
#define TEST_NAME "dns-spin-test"
static void fail(const char *fmt, ...) __attribute__((format(printf, 1, 2), noreturn));
static void unresolved(const char *fmt, ...) __attribute__((format(printf, 1, 2), noreturn));
static void stdlib_fail(const char *msg) __attribute__((noreturn));
static void handle(int sig) __attribute__((noreturn));
void stdlib_fail(const char *msg) {
perror(msg);
printf("UNRESOLVED: " TEST_NAME " (stdlib failure)\n");
exit(77);
}
void unresolved(const char *fmt, ...) {
va_list ap;
printf("UNRESOLVED: " TEST_NAME ": ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
exit(77);
}
void fail(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
exit(EXIT_FAILURE);
}
void handle(AVAHI_GCC_UNUSED int sig) {
fail("Interrupted after %d second of CPU time", MAX_CPU_SECONDS);
}
#define TRY_EXCEPT(cmd, badresult) \
do { \
if ((cmd) == (badresult)) \
unresolved("%s returned %s", #cmd, #badresult); \
} while (0)
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char *argv[]) {
struct itimerval itval;
AvahiDnsPacket *packet;
char name[512];
int ret;
uint8_t badrr[] = {
0xC0, AVAHI_DNS_PACKET_HEADER_SIZE, /* self-referential QNAME pointer */
0, 1, /* QTYPE A (host addr) */
0, 1, /* QCLASS IN (internet/ipv4) */
};
if (signal(SIGVTALRM, handle) == SIG_ERR)
stdlib_fail("signal(SIGVTALRM)");
memset(&itval, 0, sizeof(itval));
itval.it_value.tv_sec = MAX_CPU_SECONDS;
if (setitimer(ITIMER_VIRTUAL, &itval, NULL) == -1)
stdlib_fail("setitimer()");
TRY_EXCEPT(packet = avahi_dns_packet_new_query(512), NULL);
TRY_EXCEPT(avahi_dns_packet_append_bytes(packet, badrr, sizeof(badrr)), NULL);
/* This is expected to fail (if it returns) */
ret = avahi_dns_packet_consume_name(packet, name, sizeof(name));
if (ret != -1)
fail("avahi_dns_packet_consume_name() returned %d; -1 was expected", ret);
return EXIT_SUCCESS;
}
/* vim:ts=4:sw=4:et
*/
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