242 lines
7.0 KiB
C
242 lines
7.0 KiB
C
/*
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* Check decoding of msg_name* fields of struct msghdr array argument
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* of sendmmsg and recvmmsg syscalls.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2018 The strace developers.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <errno.h>
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#include <limits.h>
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#include <stddef.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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#include <sys/un.h>
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#include "msghdr.h"
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#define IOV_MAX1 (IOV_MAX + 1)
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#ifndef TEST_NAME
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# define TEST_NAME "mmsg_name"
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#endif
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static void
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print_msghdr(const struct msghdr *const msg, const int user_msg_namelen)
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{
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const struct sockaddr_un *const un = msg->msg_name;
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const int offsetof_sun_path = offsetof(struct sockaddr_un, sun_path);
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printf("{msg_name=");
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if (!un)
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printf("NULL");
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else if (user_msg_namelen < offsetof_sun_path) {
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printf("%p", un);
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} else {
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printf("{sa_family=AF_UNIX");
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if (user_msg_namelen > offsetof_sun_path) {
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int len = user_msg_namelen < (int) msg->msg_namelen ?
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user_msg_namelen : (int) msg->msg_namelen;
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len -= offsetof_sun_path;
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if (len > (int) sizeof(un->sun_path))
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len = sizeof(un->sun_path);
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printf(", sun_path=\"%.*s\"", len, un->sun_path);
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}
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printf("}");
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}
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printf(", msg_namelen=");
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if (user_msg_namelen != (int) msg->msg_namelen) {
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printf("%d->", user_msg_namelen);
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}
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printf("%d, msg_iov=[{iov_base=\"%c\", iov_len=1}]"
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", msg_iovlen=1, msg_controllen=0, msg_flags=0}",
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(int) msg->msg_namelen, *(char *) msg->msg_iov[0].iov_base);
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}
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static void
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test_mmsg_name(const int send_fd, const int recv_fd)
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{
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struct sockaddr_un *const send_addr =
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tail_alloc(sizeof(*send_addr) * IOV_MAX1);
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char *const send_buf = tail_alloc(sizeof(*send_buf) * IOV_MAX1);
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struct iovec *const send_iov = tail_alloc(sizeof(*send_iov) * IOV_MAX1);
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struct mmsghdr *const send_mh = tail_alloc(sizeof(*send_mh) * IOV_MAX1);
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int i, rc;
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for (i = 0; i < IOV_MAX1; ++i) {
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int sun_len = i + 1 > (int) sizeof(send_addr[i].sun_path)
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? (int) sizeof(send_addr[i].sun_path)
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: i + 1;
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send_addr[i].sun_family = AF_UNIX;
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memset(send_addr[i].sun_path, 'a' + i % 26, sun_len);
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send_buf[i] = '0' + i % 10;
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send_iov[i].iov_base = &send_buf[i];
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send_iov[i].iov_len = sizeof(*send_buf);
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send_mh[i].msg_hdr.msg_iov = &send_iov[i];
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send_mh[i].msg_hdr.msg_iovlen = 1;
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send_mh[i].msg_hdr.msg_name = &send_addr[i];
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send_mh[i].msg_hdr.msg_namelen = i + 1;
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send_mh[i].msg_hdr.msg_control = 0;
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send_mh[i].msg_hdr.msg_controllen = 0;
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send_mh[i].msg_hdr.msg_flags = 0;
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}
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rc = send_mmsg(send_fd, send_mh, IOV_MAX1, MSG_DONTWAIT);
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int saved_errno = errno;
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printf("sendmmsg(%d, [", send_fd);
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for (i = 0; i < IOV_MAX1; ++i) {
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if (i)
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printf(", ");
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if (i >= IOV_MAX
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# if !VERBOSE
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|| i >= DEFAULT_STRLEN
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# endif
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) {
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printf("...");
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break;
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}
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printf("{msg_hdr=");
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print_msghdr(&send_mh[i].msg_hdr, i + 1);
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printf("}");
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}
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errno = saved_errno;
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printf("], %u, MSG_DONTWAIT) = %d %s (%m)\n",
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IOV_MAX1, rc, errno2name());
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for (i = 0; i < IOV_MAX1; ++i) {
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send_mh[i].msg_hdr.msg_name = 0;
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send_mh[i].msg_hdr.msg_namelen = 0;
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}
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/*
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* When recvmmsg is called with a valid descriptor
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* but inaccessible memory, it causes segfaults on some architectures.
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* As in these cases we test decoding of failed recvmmsg calls,
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* it's ok to fail recvmmsg with any reason as long as
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* it doesn't read that inaccessible memory.
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*/
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rc = send_mmsg(-1, &send_mh[IOV_MAX], 2, MSG_DONTWAIT);
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saved_errno = errno;
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printf("sendmmsg(-1, [{msg_hdr=");
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print_msghdr(&send_mh[IOV_MAX].msg_hdr, 0);
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errno = saved_errno;
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printf("}, ... /* %p */], %u, MSG_DONTWAIT) = %d %s (%m)\n",
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&send_mh[IOV_MAX1], 2, rc, errno2name());
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rc = send_mmsg(send_fd, send_mh, IOV_MAX1, MSG_DONTWAIT);
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if (rc < 0)
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perror_msg_and_skip("sendmmsg");
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printf("sendmmsg(%d, [", send_fd);
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for (i = 0; i < IOV_MAX1; ++i) {
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if (i)
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printf(", ");
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if (i >= IOV_MAX
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#if !VERBOSE
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|| i >= DEFAULT_STRLEN
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#endif
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) {
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printf("...");
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break;
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}
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printf("{msg_hdr=");
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print_msghdr(&send_mh[i].msg_hdr, 0);
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printf("%s}", i < rc ? ", msg_len=1" : "");
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}
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printf("], %u, MSG_DONTWAIT) = %d\n", IOV_MAX1, rc);
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struct sockaddr_un *const recv_addr =
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tail_alloc(sizeof(*recv_addr) * IOV_MAX1);
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char *const recv_buf = tail_alloc(sizeof(*recv_buf) * IOV_MAX1);
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struct iovec *const recv_iov = tail_alloc(sizeof(*recv_iov) * IOV_MAX1);
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struct mmsghdr *const recv_mh = tail_alloc(sizeof(*recv_mh) * IOV_MAX1);
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for (i = 0; i < IOV_MAX1; ++i) {
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recv_iov[i].iov_base = &recv_buf[i];
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recv_iov[i].iov_len = sizeof(*recv_buf);
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recv_mh[i].msg_hdr.msg_name = &recv_addr[i];
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recv_mh[i].msg_hdr.msg_namelen = i;
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recv_mh[i].msg_hdr.msg_iov = &recv_iov[i];
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recv_mh[i].msg_hdr.msg_iovlen = 1;
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recv_mh[i].msg_hdr.msg_control = 0;
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recv_mh[i].msg_hdr.msg_controllen = 0;
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recv_mh[i].msg_hdr.msg_flags = 0;
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}
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rc = recv_mmsg(recv_fd, recv_mh, IOV_MAX1, MSG_DONTWAIT, 0);
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if (rc < 0)
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perror_msg_and_skip("recvmmsg");
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printf("recvmmsg(%d, [", recv_fd);
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for (i = 0; i < rc; ++i) {
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if (i)
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printf(", ");
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#if !VERBOSE
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if (i >= DEFAULT_STRLEN) {
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printf("...");
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break;
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}
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#endif
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printf("{msg_hdr=");
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print_msghdr(&recv_mh[i].msg_hdr, i);
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printf(", msg_len=1}");
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}
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printf("], %u, MSG_DONTWAIT, NULL) = %d\n", IOV_MAX1, rc);
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}
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int
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main(void)
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{
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
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perror_msg_and_skip("socketpair");
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const struct sockaddr_un un = {
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.sun_family = AF_UNIX,
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.sun_path = TEST_NAME "-recvmmsg.test.send.socket"
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};
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(void) unlink(un.sun_path);
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if (bind(fds[1], (const void *) &un, sizeof(un)))
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perror_msg_and_skip("bind");
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(void) unlink(un.sun_path);
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test_mmsg_name(fds[1], fds[0]);
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puts("+++ exited with 0 +++");
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return 0;
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}
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