3242b7bd5b
- While here, make this compile and work on non-i386:
- Use CMSG_SPACE(), CMSG_LEN(), and CMSG_FIRSTHDR() instead of ignoring
padding between 'struct cmsghdr' and control message payloads.
- Don't initialize the control message before calling recvmsg().
Instead, check that we get a valid control message on return from
recvmsg().
- Use errx() instead of err() for some errors that don't report failures
that set errno.
Requested by: kib (1)
336 lines
8.4 KiB
C
336 lines
8.4 KiB
C
/*-
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* Copyright (c) 2005 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* UNIX domain sockets allow file descriptors to be passed via "ancillary
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* data", or control messages. This regression test is intended to exercise
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* this facility, both performing some basic tests that it operates, and also
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* causing some kernel edge cases to execute, such as garbage collection when
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* there are cyclic file descriptor references. Right now we test only with
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* stream sockets, but ideally we'd also test with datagram sockets.
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*/
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static void
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domainsocketpair(const char *test, int *fdp)
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{
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if (socketpair(PF_UNIX, SOCK_STREAM, 0, fdp) < 0)
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err(-1, "%s: socketpair(PF_UNIX, SOCK_STREAM)", test);
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}
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static void
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closesocketpair(int *fdp)
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{
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close(fdp[0]);
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close(fdp[1]);
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}
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static void
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devnull(const char *test, int *fdp)
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{
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int fd;
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fd = open("/dev/null", O_RDONLY);
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if (fd < 0)
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err(-1, "%s: open(/dev/null)", test);
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*fdp = fd;
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}
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static void
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tempfile(const char *test, int *fdp)
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{
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char path[PATH_MAX];
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int fd;
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snprintf(path, PATH_MAX, "/tmp/unix_passfd.XXXXXXXXXXXXXXX");
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fd = mkstemp(path);
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if (fd < 0)
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err(-1, "%s: mkstemp(%s)", test, path);
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(void)unlink(path);
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*fdp = fd;
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}
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static void
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dofstat(const char *test, int fd, struct stat *sb)
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{
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if (fstat(fd, sb) < 0)
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err(-1, "%s: fstat", test);
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}
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static void
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samefile(const char *test, struct stat *sb1, struct stat *sb2)
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{
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if (sb1->st_dev != sb2->st_dev)
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errx(-1, "%s: samefile: different device", test);
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if (sb1->st_ino != sb2->st_ino)
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errx(-1, "%s: samefile: different inode", test);
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}
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static void
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sendfd(const char *test, int sockfd, int sendfd)
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{
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struct iovec iovec;
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char ch;
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char message[CMSG_SPACE(sizeof(int))];
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struct cmsghdr *cmsghdr;
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struct msghdr msghdr;
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ssize_t len;
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bzero(&msghdr, sizeof(msghdr));
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bzero(&message, sizeof(message));
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ch = 0;
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msghdr.msg_control = message;
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msghdr.msg_controllen = sizeof(message);
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iovec.iov_base = &ch;
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iovec.iov_len = sizeof(ch);
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msghdr.msg_iov = &iovec;
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msghdr.msg_iovlen = 1;
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cmsghdr = (struct cmsghdr *)message;
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cmsghdr->cmsg_len = CMSG_LEN(sizeof(int));
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cmsghdr->cmsg_level = SOL_SOCKET;
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cmsghdr->cmsg_type = SCM_RIGHTS;
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*(int *)CMSG_DATA(cmsghdr) = sendfd;
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len = sendmsg(sockfd, &msghdr, 0);
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if (len < 0)
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err(-1, "%s: sendmsg", test);
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if (len != sizeof(ch))
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errx(-1, "%s: sendmsg: %zd bytes sent", test, len);
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}
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static void
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recvfd(const char *test, int sockfd, int *recvfd)
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{
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struct cmsghdr *cmsghdr;
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char message[CMSG_SPACE(sizeof(int))];
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struct msghdr msghdr;
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struct iovec iovec;
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ssize_t len;
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char ch;
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bzero(&msghdr, sizeof(msghdr));
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ch = 0;
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msghdr.msg_control = message;
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msghdr.msg_controllen = sizeof(message);
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iovec.iov_base = &ch;
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iovec.iov_len = sizeof(ch);
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msghdr.msg_iov = &iovec;
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msghdr.msg_iovlen = 1;
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iovec.iov_len = sizeof(ch);
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msghdr.msg_iov = &iovec;
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msghdr.msg_iovlen = 1;
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len = recvmsg(sockfd, &msghdr, 0);
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if (len < 0)
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err(-1, "%s: recvmsg", test);
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if (len != sizeof(ch))
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errx(-1, "%s: recvmsg: %zd bytes received", test, len);
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cmsghdr = CMSG_FIRSTHDR(&msghdr);
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if (cmsghdr == NULL)
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errx(-1, "%s: recvmsg: did not receive control message", test);
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if (cmsghdr->cmsg_len != CMSG_LEN(sizeof(int)) ||
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cmsghdr->cmsg_level != SOL_SOCKET ||
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cmsghdr->cmsg_type != SCM_RIGHTS)
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errx(-1, "%s: recvmsg: did not receive single-fd message",
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test);
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*recvfd = *(int *)CMSG_DATA(cmsghdr);
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if (*recvfd == -1)
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errx(-1, "%s: recvmsg: received fd -1", test);
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}
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int
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main(int argc, char *argv[])
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{
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struct stat putfd_1_stat, putfd_2_stat, getfd_1_stat, getfd_2_stat;
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int fd[2], putfd_1, putfd_2, getfd_1, getfd_2;
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const char *test;
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/*
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* First test: put a temporary file into a UNIX domain socket, then
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* take it out and make sure it's the same file. First time around,
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* don't close the reference after sending.
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*/
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test = "test1-simplesendfd";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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tempfile(test, &putfd_1);
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dofstat(test, putfd_1, &putfd_1_stat);
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sendfd(test, fd[0], putfd_1);
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recvfd(test, fd[1], &getfd_1);
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dofstat(test, getfd_1, &getfd_1_stat);
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samefile(test, &putfd_1_stat, &getfd_1_stat);
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close(putfd_1);
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close(getfd_1);
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closesocketpair(fd);
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printf("%s passed\n", test);
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/*
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* Second test: same as first, only close the file reference after
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* sending, so that the only reference is the descriptor in the UNIX
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* domain socket buffer.
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*/
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test = "test2-sendandclose";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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tempfile(test, &putfd_1);
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dofstat(test, putfd_1, &putfd_1_stat);
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sendfd(test, fd[0], putfd_1);
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close(putfd_1);
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recvfd(test, fd[1], &getfd_1);
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dofstat(test, getfd_1, &getfd_1_stat);
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samefile(test, &putfd_1_stat, &getfd_1_stat);
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close(getfd_1);
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closesocketpair(fd);
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printf("%s passed\n", test);
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/*
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* Third test: put a temporary file into a UNIX domain socket, then
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* close both endpoints causing garbage collection to kick off.
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*/
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test = "test3-sendandcancel";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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tempfile(test, &putfd_1);
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sendfd(test, fd[0], putfd_1);
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close(putfd_1);
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closesocketpair(fd);
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printf("%s passed\n", test);
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/*
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* Send two files. Then receive them. Make sure they are returned
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* in the right order, and both get there.
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*/
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test = "test4-twofile";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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tempfile(test, &putfd_1);
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tempfile(test, &putfd_2);
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dofstat(test, putfd_1, &putfd_1_stat);
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dofstat(test, putfd_2, &putfd_2_stat);
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sendfd(test, fd[0], putfd_1);
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sendfd(test, fd[0], putfd_2);
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close(putfd_1);
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close(putfd_2);
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recvfd(test, fd[1], &getfd_1);
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recvfd(test, fd[1], &getfd_2);
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dofstat(test, getfd_1, &getfd_1_stat);
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dofstat(test, getfd_2, &getfd_2_stat);
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samefile(test, &putfd_1_stat, &getfd_1_stat);
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samefile(test, &putfd_2_stat, &getfd_2_stat);
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close(getfd_1);
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close(getfd_2);
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closesocketpair(fd);
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printf("%s passed\n", test);
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/*
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* Big bundling test. Send an endpoint of the UNIX domain socket
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* over itself, closing the door behind it.
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*/
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test = "test5-bundle";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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sendfd(test, fd[0], fd[0]);
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close(fd[0]);
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recvfd(test, fd[1], &getfd_1);
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close(getfd_1);
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close(fd[1]);
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printf("%s passed\n", test);
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/*
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* Big bundling test part two: Send an endpoint of the UNIX domain
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* socket over itself, close the door behind it, and never remove it
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* from the other end.
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*/
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test = "test6-bundlecancel";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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sendfd(test, fd[0], fd[0]);
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sendfd(test, fd[1], fd[0]);
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closesocketpair(fd);
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printf("%s passed\n", test);
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/*
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* Test for PR 151758: Send an character device over the UNIX
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* domain socket and then close both sockets to orphan the
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* device.
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*/
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test = "test7-devfsorphan";
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printf("beginning %s\n", test);
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domainsocketpair(test, fd);
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devnull(test, &putfd_1);
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sendfd(test, fd[0], putfd_1);
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close(putfd_1);
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closesocketpair(fd);
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printf("%s passed\n", test);
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return (0);
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}
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