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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.
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Copyright (C) 2021-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <string.h>
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#include <fcntl.h>
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static void
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send_fd (int sockfd, int fd)
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{
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char data[] = "hello";
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struct iovec iov = { .iov_base = data, .iov_len = sizeof (data) };
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union
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{
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struct cmsghdr header;
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char bytes[CMSG_SPACE (sizeof (fd))];
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} cmsg_storage;
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struct msghdr msg =
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{
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = cmsg_storage.bytes,
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.msg_controllen = sizeof (cmsg_storage)
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};
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memset (&cmsg_storage, 0, sizeof (cmsg_storage));
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struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN (sizeof (fd));
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memcpy (CMSG_DATA (cmsg), &fd, sizeof (fd));
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ssize_t nsent = sendmsg (sockfd, &msg, 0);
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if (nsent < 0)
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FAIL_EXIT1 ("sendmsg (%d): %m", sockfd);
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TEST_COMPARE (nsent, sizeof (data));
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}
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static int
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recv_fd (int sockfd, int flags)
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{
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char buffer[100];
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struct iovec iov = { .iov_base = buffer, .iov_len = sizeof (buffer) };
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union
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{
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struct cmsghdr header;
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char bytes[100];
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} cmsg_storage;
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struct msghdr msg =
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{
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = cmsg_storage.bytes,
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.msg_controllen = sizeof (cmsg_storage)
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};
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ssize_t nrecv = recvmsg (sockfd, &msg, flags);
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if (nrecv < 0)
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FAIL_EXIT1 ("recvmsg (%d): %m", sockfd);
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TEST_COMPARE (msg.msg_controllen, CMSG_SPACE (sizeof (int)));
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struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
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TEST_COMPARE (cmsg->cmsg_level, SOL_SOCKET);
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TEST_COMPARE (cmsg->cmsg_type, SCM_RIGHTS);
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TEST_COMPARE (cmsg->cmsg_len, CMSG_LEN (sizeof (int)));
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int fd;
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memcpy (&fd, CMSG_DATA (cmsg), sizeof (fd));
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return fd;
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}
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static int
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do_test (void)
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{
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int sockfd[2];
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int newfd;
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int flags;
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int rc = socketpair (AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockfd);
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if (rc < 0)
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FAIL_EXIT1 ("socketpair: %m");
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send_fd (sockfd[1], STDIN_FILENO);
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newfd = recv_fd (sockfd[0], 0);
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TEST_VERIFY_EXIT (newfd > 0);
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flags = fcntl (newfd, F_GETFD, 0);
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TEST_VERIFY_EXIT (flags != -1);
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TEST_VERIFY (!(flags & FD_CLOEXEC));
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xclose (newfd);
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send_fd (sockfd[1], STDIN_FILENO);
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newfd = recv_fd (sockfd[0], MSG_CMSG_CLOEXEC);
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TEST_VERIFY_EXIT (newfd > 0);
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flags = fcntl (newfd, F_GETFD, 0);
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TEST_VERIFY_EXIT (flags != -1);
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TEST_VERIFY (flags & FD_CLOEXEC);
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xclose (newfd);
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xclose (sockfd[0]);
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xclose (sockfd[1]);
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return 0;
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}
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#include <support/test-driver.c>
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