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* [glibc] socket: Add a test for MSG_CMSG_CLOEXEC
@ 2023-04-24 22:21 Samuel Thibault
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From: Samuel Thibault @ 2023-04-24 22:21 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=904b94c07af84b7e4c98de3bbb822ccffcaf8c40
commit 904b94c07af84b7e4c98de3bbb822ccffcaf8c40
Author: Sergey Bugaev <bugaevc@gmail.com>
Date: Sun Apr 23 19:05:48 2023 +0300
socket: Add a test for MSG_CMSG_CLOEXEC
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>
Diff:
---
socket/Makefile | 1 +
socket/tst-cmsg_cloexec.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 127 insertions(+)
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>
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