diff options
| -rw-r--r-- | socket/Makefile | 1 | ||||
| -rw-r--r-- | socket/tst-cmsg_cloexec.c | 126 |
2 files changed, 127 insertions, 0 deletions
diff --git a/socket/Makefile b/socket/Makefile index fffed7dd82..94951ae3e7 100644 --- a/socket/Makefile +++ b/socket/Makefile @@ -35,6 +35,7 @@ tests := \ tst-accept4 \ tst-sockopt \ tst-cmsghdr \ + tst-cmsg_cloexec \ # tests tests-internal := \ diff --git a/socket/tst-cmsg_cloexec.c b/socket/tst-cmsg_cloexec.c new file mode 100644 index 0000000000..a18f491232 --- /dev/null +++ b/socket/tst-cmsg_cloexec.c @@ -0,0 +1,126 @@ +/* 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> |