/*-
* Copyright (c) 2004 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BIND_ATTEMPTS 10
#define LOOPS 500
#define NUM_ATTEMPTS 1000
static volatile int quit;
static void
child_died(int sig __unused)
{
quit = 1;
}
/*
* This test is intended to detect a leak of a file descriptor in the process
* following a failed non-blocking accept. It measures an available fd
* baseline, then performs 1000 failing accepts, then checks to see what the
* next fd is. It relies on sequential fd allocation, and will test for it
* briefly before beginning (not 100% reliable, but a good start).
*/
int
main(void)
{
struct sockaddr_in sin;
socklen_t size;
pid_t child;
int fd1, fd2, fd3, i, listen_port, s, status;
printf("1..2\n");
/*
* Check for sequential fd allocation, and give up early if not.
*/
fd1 = dup(STDIN_FILENO);
fd2 = dup(STDIN_FILENO);
if (fd2 != fd1 + 1)
errx(-1, "Non-sequential fd allocation\n");
s = socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
errx(-1, "socket: %s", strerror(errno));
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
srandomdev();
for (i = 0; i < BIND_ATTEMPTS; i++) {
/* Pick a random unprivileged port 1025-65535 */
listen_port = MAX((int)random() % 65535, 1025);
sin.sin_port = htons(listen_port);
if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0)
break;
warn("bind with %d failed", listen_port);
usleep(1000);
}
if (i >= BIND_ATTEMPTS) {
printf("Bail out!\n");
exit(1);
}
if (listen(s, -1) != 0)
errx(-1, "listen: %s", strerror(errno));
i = fcntl(s, F_GETFL);
if (i == -1)
errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
i |= O_NONBLOCK;
if (fcntl(s, F_SETFL, i) != 0)
errx(-1, "ioctl(F_SETFL): %s", strerror(errno));
i = fcntl(s, F_GETFL);
if (i == -1)
errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
if ((i & O_NONBLOCK) != O_NONBLOCK)
errx(-1, "Failed to set O_NONBLOCK (i=0x%x)\n", i);
for (i = 0; i < LOOPS; i++) {
size = sizeof(sin);
if (accept(s, (struct sockaddr *)&sin, &size) != -1)
errx(-1, "accept succeeded\n");
if (errno != EAGAIN)
errx(-1, "accept: %s", strerror(errno));
}
/*
* Allocate a file descriptor and make sure it's fd2+2. 2 because
* we allocate an fd for the socket.
*/
fd3 = dup(STDIN_FILENO);
if (fd3 != fd2 + 2)
printf("not ok 1 - (%d, %d, %d)\n", fd1, fd2, fd3);
else
printf("ok 1\n");
/*
* Try failing accept's w/o non-blocking where the destination
* address pointer is invalid.
*/
close(fd3);
signal(SIGCHLD, child_died);
child = fork();
if (child < 0)
errx(-1, "fork: %s", strerror(errno));
/*
* Child process does `NUM_ATTEMPTS` connects.
*/
if (child == 0) {
close(fd1);
close(fd2);
close(s);
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = htons(listen_port);
for (i = 0; i < NUM_ATTEMPTS; i++) {
s = socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
errx(-1, "socket: %s", strerror(errno));
if (connect(s, (struct sockaddr *)&sin,
sizeof(sin)) < 0)
errx(-1, "connect: %s", strerror(errno));
close(s);
}
_exit(0);
}
/* Reset back to a blocking socket. */
i = fcntl(s, F_GETFL);
if (i == -1)
errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
i &= ~O_NONBLOCK;
if (fcntl(s, F_SETFL, i) != 0)
errx(-1, "ioctl(F_SETFL): %s", strerror(errno));
i = fcntl(s, F_GETFL);
if (i == -1)
errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
if (i & O_NONBLOCK)
errx(-1, "Failed to clear O_NONBLOCK (i=0x%x)\n", i);
/* Do `NUM_ATTEMPTS` accepts with an invalid pointer. */
for (i = 0; !quit && i < NUM_ATTEMPTS; i++) {
size = sizeof(sin);
if (accept(s, (struct sockaddr *)(uintptr_t)(0x100),
&size) != -1)
errx(-1, "accept succeeded\n");
if (errno != EFAULT)
errx(-1, "accept: %s", strerror(errno));
}
if (waitpid(child, &status, 0) < 0)
errx(-1, "waitpid: %s", strerror(errno));
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
warnx("child process died");
/*
* Allocate a file descriptor and make sure it's fd2+2. 2 because
* we allocate an fd for the socket.
*/
fd3 = dup(STDIN_FILENO);
if (fd3 != fd2 + 2)
printf("not ok 2 - (%d, %d, %d)\n", fd1, fd2, fd3);
else
printf("ok 2\n");
return (0);
}
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