/*-
* Copyright (c) 2005 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/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/*
* Simple regression test to exercise some error cases relating to the use of
* bind() and connect() on UNIX domain sockets. In particular, make sure
* that when two sockets rendezvous using the file system name space, they
* get the expected success/failure cases.
*
* TODO:
* - Check that the resulting file mode/owner are right.
* - Do the same tests with UNIX domain sockets.
* - Check the results of getsockaddr() and getpeeraddr().
*/
#define SOCK_NAME_ONE "socket.1"
#define SOCK_NAME_TWO "socket.2"
#define UNWIND_MAX 1024
static int unwind_len;
static struct unwind {
char u_path[PATH_MAX];
} unwind_list[UNWIND_MAX];
static void
push_path(const char *path)
{
if (unwind_len >= UNWIND_MAX)
err(-1, "push_path: one path too many (%s)", path);
strlcpy(unwind_list[unwind_len].u_path, path, PATH_MAX);
unwind_len++;
}
static void
unwind(void)
{
int i;
for (i = unwind_len - 1; i >= 0; i--) {
unlink(unwind_list[i].u_path);
rmdir(unwind_list[i].u_path);
}
}
static int
bind_test(const char *directory_path)
{
char socket_path[PATH_MAX];
struct sockaddr_un sun;
int sock1, sock2;
sock1 = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock1 < 0) {
warn("bind_test: socket(PF_UNIX, SOCK_STREAM, 0)");
return (-1);
}
if (snprintf(socket_path, sizeof(socket_path), "%s/%s",
directory_path, SOCK_NAME_ONE) >= PATH_MAX) {
warn("bind_test: snprintf(socket_path)");
close(sock1);
return (-1);
}
bzero(&sun, sizeof(sun));
sun.sun_len = sizeof(sun);
sun.sun_family = AF_UNIX;
if (snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", socket_path)
>= (int)sizeof(sun.sun_path)) {
warn("bind_test: snprintf(sun.sun_path)");
close(sock1);
return (-1);
}
if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
warn("bind_test: bind(sun) #1");
close(sock1);
return (-1);
}
push_path(socket_path);
/*
* Once a STREAM UNIX domain socket has been bound, it can't be
* rebound. Expected error is EINVAL.
*/
if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
warnx("bind_test: bind(sun) #2 succeeded");
close(sock1);
return (-1);
}
if (errno != EINVAL) {
warn("bind_test: bind(sun) #2");
close(sock1);
return (-1);
}
sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock2 < 0) {
warn("bind_test: socket(PF_UNIX, SOCK_STREAM, 0)");
close(sock1);
return (-1);
}
/*
* Since a socket is already bound to the pathname, it can't be bound
* to a second socket. Expected error is EADDRINUSE.
*/
if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
warnx("bind_test: bind(sun) #3 succeeded");
close(sock1);
close(sock2);
return (-1);
}
if (errno != EADDRINUSE) {
warn("bind_test: bind(sun) #2");
close(sock1);
close(sock2);
return (-1);
}
close(sock1);
/*
* The socket bound to the pathname has been closed, but the pathname
* can't be reused without first being unlinked. Expected error is
* EADDRINUSE.
*/
if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
warnx("bind_test: bind(sun) #4 succeeded");
close(sock2);
return (-1);
}
if (errno != EADDRINUSE) {
warn("bind_test: bind(sun) #4");
close(sock2);
return (-1);
}
unlink(socket_path);
/*
* The pathname is now free, so the socket should be able to bind to
* it.
*/
if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
warn("bind_test: bind(sun) #5");
close(sock2);
return (-1);
}
close(sock2);
return (0);
}
static int
connect_test(const char *directory_path)
{
char socket_path[PATH_MAX];
struct sockaddr_un sun;
int sock1, sock2;
sock1 = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock1 < 0) {
warn("connect_test: socket(PF_UNIX, SOCK_STREAM, 0)");
return (-1);
}
if (snprintf(socket_path, sizeof(socket_path), "%s/%s",
directory_path, SOCK_NAME_TWO) >= PATH_MAX) {
warn("connect_test: snprintf(socket_path)");
close(sock1);
return (-1);
}
bzero(&sun, sizeof(sun));
sun.sun_len = sizeof(sun);
sun.sun_family = AF_UNIX;
if (snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", socket_path)
>= (int)sizeof(sun.sun_path)) {
warn("connect_test: snprintf(sun.sun_path)");
close(sock1);
return (-1);
}
/*
* Try connecting to a path that doesn't yet exist. Should fail with
* ENOENT.
*/
if (connect(sock1, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
warnx("connect_test: connect(sun) #1 succeeded");
close(sock1);
return (-1);
}
if (errno != ENOENT) {
warn("connect_test: connect(sun) #1");
close(sock1);
return (-1);
}
if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
warn("connect_test: bind(sun) #1");
close(sock1);
return (-1);
}
if (listen(sock1, 3) < 0) {
warn("connect_test: listen(sock1)");
close(sock1);
return (-1);
}
push_path(socket_path);
sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock2 < 0) {
warn("socket(PF_UNIX, SOCK_STREAM, 0)");
close(sock1);
return (-1);
}
/*
* Do a simple connect and make sure that works.
*/
if (connect(sock2, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
warn("connect(sun) #2");
close(sock1);
return (-1);
}
close(sock2);
close(sock1);
sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock2 < 0) {
warn("socket(PF_UNIX, SOCK_STREAM, 0)");
return (-1);
}
/*
* Confirm that once the listen socket is closed, we get a
* connection refused (ECONNREFUSED) when attempting to connect to
* the pathname.
*/
if (connect(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
warnx("connect(sun) #3 succeeded");
close(sock2);
return (-1);
}
if (errno != ECONNREFUSED) {
warn("connect(sun) #3");
close(sock2);
return (-1);
}
close(sock2);
unlink(socket_path);
return (0);
}
int
main(void)
{
char directory_path[PATH_MAX];
int error;
strlcpy(directory_path, "/tmp/unix_bind.XXXXXXX", PATH_MAX);
if (mkdtemp(directory_path) == NULL)
err(-1, "mkdtemp");
push_path(directory_path);
error = bind_test(directory_path);
if (error == 0)
error = connect_test(directory_path);
unwind();
return (error);
}
plain