mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-19 16:10:01 +00:00
904b94c07a
This checks that: * We can send and receive fds over Unix domain sockets using SCM_RIGHTS; * msg_controllen, cmsg_level, cmsg_type, cmsg_len are all filled in correctly on receive; * Most importantly, the received fd has or has not the close-on-exec flag set depending on whether we pass MSG_CMSG_CLOEXEC to recvmsg (). Checked on i686-gnu and x86_64-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423160548.126576-4-bugaevc@gmail.com>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/* Smoke test for MSG_CMSG_CLOEXEC.
|
|
Copyright (C) 2021-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library 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.
|
|
|
|
The GNU C Library 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 the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <support/xunistd.h>
|
|
#include <support/check.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/un.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
|
|
static void
|
|
send_fd (int sockfd, int fd)
|
|
{
|
|
char data[] = "hello";
|
|
struct iovec iov = { .iov_base = data, .iov_len = sizeof (data) };
|
|
|
|
union
|
|
{
|
|
struct cmsghdr header;
|
|
char bytes[CMSG_SPACE (sizeof (fd))];
|
|
} cmsg_storage;
|
|
|
|
struct msghdr msg =
|
|
{
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = cmsg_storage.bytes,
|
|
.msg_controllen = sizeof (cmsg_storage)
|
|
};
|
|
|
|
memset (&cmsg_storage, 0, sizeof (cmsg_storage));
|
|
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN (sizeof (fd));
|
|
memcpy (CMSG_DATA (cmsg), &fd, sizeof (fd));
|
|
|
|
ssize_t nsent = sendmsg (sockfd, &msg, 0);
|
|
if (nsent < 0)
|
|
FAIL_EXIT1 ("sendmsg (%d): %m", sockfd);
|
|
TEST_COMPARE (nsent, sizeof (data));
|
|
}
|
|
|
|
static int
|
|
recv_fd (int sockfd, int flags)
|
|
{
|
|
char buffer[100];
|
|
struct iovec iov = { .iov_base = buffer, .iov_len = sizeof (buffer) };
|
|
|
|
union
|
|
{
|
|
struct cmsghdr header;
|
|
char bytes[100];
|
|
} cmsg_storage;
|
|
|
|
struct msghdr msg =
|
|
{
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = cmsg_storage.bytes,
|
|
.msg_controllen = sizeof (cmsg_storage)
|
|
};
|
|
|
|
ssize_t nrecv = recvmsg (sockfd, &msg, flags);
|
|
if (nrecv < 0)
|
|
FAIL_EXIT1 ("recvmsg (%d): %m", sockfd);
|
|
|
|
TEST_COMPARE (msg.msg_controllen, CMSG_SPACE (sizeof (int)));
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
|
|
TEST_COMPARE (cmsg->cmsg_level, SOL_SOCKET);
|
|
TEST_COMPARE (cmsg->cmsg_type, SCM_RIGHTS);
|
|
TEST_COMPARE (cmsg->cmsg_len, CMSG_LEN (sizeof (int)));
|
|
|
|
int fd;
|
|
memcpy (&fd, CMSG_DATA (cmsg), sizeof (fd));
|
|
return fd;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
int sockfd[2];
|
|
int newfd;
|
|
int flags;
|
|
int rc = socketpair (AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockfd);
|
|
if (rc < 0)
|
|
FAIL_EXIT1 ("socketpair: %m");
|
|
|
|
send_fd (sockfd[1], STDIN_FILENO);
|
|
newfd = recv_fd (sockfd[0], 0);
|
|
TEST_VERIFY_EXIT (newfd > 0);
|
|
flags = fcntl (newfd, F_GETFD, 0);
|
|
TEST_VERIFY_EXIT (flags != -1);
|
|
TEST_VERIFY (!(flags & FD_CLOEXEC));
|
|
xclose (newfd);
|
|
|
|
send_fd (sockfd[1], STDIN_FILENO);
|
|
newfd = recv_fd (sockfd[0], MSG_CMSG_CLOEXEC);
|
|
TEST_VERIFY_EXIT (newfd > 0);
|
|
flags = fcntl (newfd, F_GETFD, 0);
|
|
TEST_VERIFY_EXIT (flags != -1);
|
|
TEST_VERIFY (flags & FD_CLOEXEC);
|
|
xclose (newfd);
|
|
|
|
xclose (sockfd[0]);
|
|
xclose (sockfd[1]);
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|