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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* test_sigreceive - wait for signal and exit with value of it
*
* Written by Sami Kerola <kerolasa@iki.fi>
*/
#include <err.h>
#include <getopt.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include "strutils.h"
#define TEST_SIGRECEIVE_FAILURE 0
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs("Usage: test_sigreceive [-s|--setuid <login|uid>]\n", out);
exit(TEST_SIGRECEIVE_FAILURE);
}
static __attribute__((__noreturn__))
void exiter(int signo __attribute__((__unused__)),
siginfo_t *info,
void *context __attribute__((__unused__)))
{
int ret = info->si_signo;
if (info->si_code == SI_QUEUE && info->si_value.sival_int != 0)
ret = info->si_value.sival_int;
_exit(ret);
}
int main(int argc, char **argv)
{
struct sigaction sigact;
fd_set rfds;
struct timeval timeout;
char *user = NULL;
int c;
static const struct option longopts[] = {
{"setuid", required_argument, NULL, 's'},
{NULL, 0, NULL, 0}
};
while ((c = getopt_long(argc, argv, "s:h", longopts, NULL)) != -1)
switch (c) {
case 's':
user = optarg;
break;
case 'h':
usage(stdout);
default:
usage(stderr);
}
if (user) {
struct passwd *pw;
uid_t uid;
pw = getpwnam(user);
if (pw)
uid = pw->pw_uid;
else
uid = strtou32_or_err(user, "failed to parse uid");
if (setuid(uid) < 0)
err(TEST_SIGRECEIVE_FAILURE, "setuid failed");
}
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO;
sigact.sa_sigaction = exiter;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGQUIT, &sigact, NULL);
sigaction(SIGILL, &sigact, NULL);
#ifdef SIGTRAP
sigaction(SIGTRAP, &sigact, NULL);
#endif
sigaction(SIGABRT, &sigact, NULL);
#ifdef SIGIOT
sigaction(SIGIOT, &sigact, NULL);
#endif
#ifdef SIGEMT
sigaction(SIGEMT, &sigact, NULL);
#endif
#ifdef SIGBUS
sigaction(SIGBUS, &sigact, NULL);
#endif
sigaction(SIGFPE, &sigact, NULL);
sigaction(SIGUSR1, &sigact, NULL);
sigaction(SIGSEGV, &sigact, NULL);
sigaction(SIGUSR2, &sigact, NULL);
sigaction(SIGPIPE, &sigact, NULL);
sigaction(SIGALRM, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
#ifdef SIGSTKFLT
sigaction(SIGSTKFLT, &sigact, NULL);
#endif
sigaction(SIGCHLD, &sigact, NULL);
#ifdef SIGCLD
sigaction(SIGCLD, &sigact, NULL);
#endif
sigaction(SIGCONT, &sigact, NULL);
sigaction(SIGTSTP, &sigact, NULL);
sigaction(SIGTTIN, &sigact, NULL);
sigaction(SIGTTOU, &sigact, NULL);
#ifdef SIGURG
sigaction(SIGURG, &sigact, NULL);
#endif
#ifdef SIGXCPU
sigaction(SIGXCPU, &sigact, NULL);
#endif
#ifdef SIGXFSZ
sigaction(SIGXFSZ, &sigact, NULL);
#endif
#ifdef SIGVTALRM
sigaction(SIGVTALRM, &sigact, NULL);
#endif
#ifdef SIGPROF
sigaction(SIGPROF, &sigact, NULL);
#endif
#ifdef SIGWINCH
sigaction(SIGWINCH, &sigact, NULL);
#endif
#ifdef SIGIO
sigaction(SIGIO, &sigact, NULL);
#endif
#ifdef SIGPOLL
sigaction(SIGPOLL, &sigact, NULL);
#endif
#ifdef SIGINFO
sigaction(SIGINFO, &sigact, NULL);
#endif
#ifdef SIGLOST
sigaction(SIGLOST, &sigact, NULL);
#endif
#ifdef SIGPWR
sigaction(SIGPWR, &sigact, NULL);
#endif
#ifdef SIGUNUSED
sigaction(SIGUNUSED, &sigact, NULL);
#endif
#ifdef SIGSYS
sigaction(SIGSYS, &sigact, NULL);
#endif
#ifdef SIGRTMIN
sigaction(SIGRTMIN, &sigact, NULL);
sigaction(SIGRTMAX, &sigact, NULL);
#endif
/* Keep SIGHUP last, the bit it flips tells to check script the
* helper is ready to be killed. */
sigaction(SIGHUP, &sigact, NULL);
FD_ZERO(&rfds);
FD_SET(STDIN_FILENO, &rfds);
select(0, &rfds, NULL, NULL, &timeout);
exit(TEST_SIGRECEIVE_FAILURE);
}
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