435 lines
16 KiB
C
435 lines
16 KiB
C
/*
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* Check decoding of netlink protocol.
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*
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* Copyright (c) 2014-2017 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
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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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#ifdef HAVE_SYS_XATTR_H
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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# include <unistd.h>
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# include <sys/xattr.h>
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# include <netinet/in.h>
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# include "netlink.h"
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# include <linux/sock_diag.h>
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# include <linux/netlink_diag.h>
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static void
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send_query(const int fd)
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{
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static const struct req {
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struct nlmsghdr nlh;
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const char magic[4];
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} c_req = {
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.nlh = {
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.nlmsg_len = sizeof(struct req),
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.nlmsg_type = NLMSG_NOOP,
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.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
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},
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.magic = "abcd"
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};
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struct req *const req = tail_memdup(&c_req, sizeof(c_req));
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long rc;
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const char *errstr;
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/* zero address */
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rc = sendto(fd, NULL, sizeof(*req), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, NULL, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, (unsigned) sizeof(*req), sprintrc(rc));
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/* zero length */
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rc = sendto(fd, req, 0, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, \"\", 0, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, sprintrc(rc));
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/* zero address and length */
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rc = sendto(fd, NULL, 0, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, NULL, 0, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, sprintrc(rc));
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/* unfetchable struct nlmsghdr */
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const void *const efault = tail_alloc(sizeof(struct nlmsghdr) - 1);
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rc = sendto(fd, efault, sizeof(struct nlmsghdr), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, %p, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, efault, (unsigned) sizeof(struct nlmsghdr), sprintrc(rc));
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/* whole message length < sizeof(struct nlmsghdr) */
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rc = sendto(fd, req->magic, sizeof(req->magic), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, \"\\x61\\x62\\x63\\x64\""
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, (unsigned) sizeof(req->magic), sprintrc(rc));
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/* a single message with some data */
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rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, req->nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(*req), sprintrc(rc));
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/* a single message without data */
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req->nlh.nlmsg_len = sizeof(req->nlh);
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rc = sendto(fd, &req->nlh, sizeof(req->nlh), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, req->nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(req->nlh), sprintrc(rc));
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/* nlmsg_len > whole message length */
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req->nlh.nlmsg_len = sizeof(*req) + 8;
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rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, req->nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(*req), sprintrc(rc));
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/* nlmsg_len < sizeof(struct nlmsghdr) */
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req->nlh.nlmsg_len = 8;
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rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, req->nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(*req), sprintrc(rc));
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/* a sequence of two nlmsg objects */
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struct reqs {
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struct req req1;
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char padding[NLMSG_ALIGN(sizeof(struct req)) - sizeof(struct req)];
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struct req req2;
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};
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TAIL_ALLOC_OBJECT_CONST_PTR(struct reqs, reqs);
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memcpy(&reqs->req1, &c_req, sizeof(c_req));
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memcpy(&reqs->req2, &c_req, sizeof(c_req));
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rc = sendto(fd, reqs, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, [{{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}"
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", {{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}]"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
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reqs->req2.nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(*reqs), sprintrc(rc));
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/* unfetchable second struct nlmsghdr */
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void *const efault2 = tail_memdup(&reqs->req1, sizeof(reqs->req1));
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rc = sendto(fd, efault2, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, [{{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}"
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", ... /* %p */], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
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&((struct reqs *) efault2)->req2, (unsigned) sizeof(*reqs),
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sprintrc(rc));
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/* message length is not enough for the second struct nlmsghdr */
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rc = sendto(fd, reqs, sizeof(*reqs) - sizeof(req->nlh), MSG_DONTWAIT,
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NULL, 0);
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errstr = sprintrc(rc);
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printf("sendto(%d, [{{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}, ",
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fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP);
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print_quoted_hex(&reqs->req2.nlh,
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sizeof(reqs->req2) - sizeof(req->nlh));
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printf("], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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(unsigned) (sizeof(*reqs) - sizeof(req->nlh)), errstr);
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/* second nlmsg_len < sizeof(struct nlmsghdr) */
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reqs->req2.nlh.nlmsg_len = 4;
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rc = sendto(fd, reqs, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, [{{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}, \"\\x61\\x62\\x63\\x64\"}"
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", {len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=0, pid=0}], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
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reqs->req2.nlh.nlmsg_len, NLM_F_DUMP,
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(unsigned) sizeof(*reqs), sprintrc(rc));
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/* abbreviated output */
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# define ABBREV_LEN (DEFAULT_STRLEN + 1)
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const unsigned int msg_len = sizeof(struct nlmsghdr) * ABBREV_LEN;
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struct nlmsghdr *const msgs = tail_alloc(msg_len);
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unsigned int i;
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for (i = 0; i < ABBREV_LEN; ++i) {
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msgs[i].nlmsg_len = sizeof(*msgs);
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msgs[i].nlmsg_type = NLMSG_NOOP;
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msgs[i].nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
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msgs[i].nlmsg_seq = i;
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msgs[i].nlmsg_pid = 0;
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}
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rc = sendto(fd, msgs, msg_len, MSG_DONTWAIT, NULL, 0);
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errstr = sprintrc(rc);
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printf("sendto(%d, [", fd);
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for (i = 0; i < DEFAULT_STRLEN; ++i) {
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if (i)
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printf(", ");
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printf("{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=%u, pid=0}",
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msgs[i].nlmsg_len, NLM_F_DUMP, msgs[i].nlmsg_seq);
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}
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printf(", ...], %u, MSG_DONTWAIT, NULL, 0) = %s\n", msg_len, errstr);
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}
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static void
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test_nlmsgerr(const int fd)
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{
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struct nlmsgerr *err;
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struct nlmsghdr *nlh;
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void *const nlh0 = midtail_alloc(NLMSG_HDRLEN, sizeof(*err) + 4);
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long rc;
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/* error message without enough room for the error code */
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nlh = nlh0;
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nlh->nlmsg_len = NLMSG_HDRLEN + 4;
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nlh->nlmsg_seq = 0;
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nlh->nlmsg_pid = 0;
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, %p}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, nlh->nlmsg_len, nlh0 + NLMSG_HDRLEN,
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nlh->nlmsg_len, sprintrc(rc));
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nlh->nlmsg_len = NLMSG_HDRLEN + 2;
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nlh = nlh0 - 2;
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memmove(nlh, nlh0, sizeof(*nlh));
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memcpy(NLMSG_DATA(nlh), "42", 2);
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rc = sendto(fd, nlh, NLMSG_HDRLEN + 2, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, \"\\x34\\x32\"}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, NLMSG_HDRLEN + 2, NLMSG_HDRLEN + 2, sprintrc(rc));
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/* error message with room for the error code only */
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nlh = nlh0 - sizeof(err->error);
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nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(err->error);
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nlh->nlmsg_seq = 0;
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nlh->nlmsg_pid = 0;
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err = NLMSG_DATA(nlh);
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err->error = 42;
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, {error=42}}, %u, MSG_DONTWAIT, NULL, 0)"
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" = %s\n", fd, nlh->nlmsg_len, nlh->nlmsg_len, sprintrc(rc));
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err->error = -1;
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, {error=-EPERM}}, %u, MSG_DONTWAIT, NULL, 0)"
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" = %s\n", fd, nlh->nlmsg_len, nlh->nlmsg_len, sprintrc(rc));
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err->error = -32767;
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nlh->nlmsg_len += sizeof(err->msg.nlmsg_len);
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, {error=-32767, msg=%p}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, nlh->nlmsg_len, nlh0 + NLMSG_HDRLEN,
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nlh->nlmsg_len, sprintrc(rc));
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/* error message with room for the error code and a header */
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nlh = nlh0 - sizeof(*err);
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nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err);
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nlh->nlmsg_seq = 0;
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nlh->nlmsg_pid = 0;
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err = NLMSG_DATA(nlh);
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err->error = -13;
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err->msg.nlmsg_len = NLMSG_HDRLEN;
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err->msg.nlmsg_type = NLMSG_NOOP;
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err->msg.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
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err->msg.nlmsg_seq = 42;
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err->msg.nlmsg_pid = 1234;
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, {error=-EACCES"
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", msg={len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=%u, pid=%u}}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
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err->msg.nlmsg_seq, err->msg.nlmsg_pid,
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nlh->nlmsg_len, sprintrc(rc));
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/* error message with room for the error code, a header, and some data */
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nlh = nlh0 - sizeof(*err) - 4;
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nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err) + 4;
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nlh->nlmsg_seq = 0;
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nlh->nlmsg_pid = 0;
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err = NLMSG_DATA(nlh);
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err->error = -13;
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err->msg.nlmsg_len = NLMSG_HDRLEN + 4;
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err->msg.nlmsg_type = NLMSG_NOOP;
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err->msg.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
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err->msg.nlmsg_seq = 421;
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err->msg.nlmsg_pid = 12345;
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memcpy(NLMSG_DATA(&err->msg), "abcd", 4);
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_ERROR, flags=NLM_F_REQUEST"
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", seq=0, pid=0}, {error=-EACCES"
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", msg={{len=%u, type=NLMSG_NOOP, flags=NLM_F_REQUEST|0x%x"
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", seq=%u, pid=%u}, \"\\x61\\x62\\x63\\x64\"}}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
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err->msg.nlmsg_seq, err->msg.nlmsg_pid,
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nlh->nlmsg_len, sprintrc(rc));
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}
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static void
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test_nlmsg_done(const int fd)
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{
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struct nlmsghdr *nlh;
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const int num = 0xfacefeed;
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void *const nlh0 = midtail_alloc(NLMSG_HDRLEN, sizeof(num));
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long rc;
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/* NLMSG_DONE message without enough room for an integer payload */
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nlh = nlh0;
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*nlh = (struct nlmsghdr) {
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.nlmsg_len = NLMSG_HDRLEN + sizeof(num),
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.nlmsg_type = NLMSG_DONE,
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.nlmsg_flags = NLM_F_MULTI
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};
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_DONE, flags=NLM_F_MULTI"
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", seq=0, pid=0}, %p}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, nlh->nlmsg_len, nlh0 + NLMSG_HDRLEN,
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nlh->nlmsg_len, sprintrc(rc));
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/* NLMSG_DONE message with enough room for an oddly short payload */
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nlh->nlmsg_len = NLMSG_HDRLEN + 2;
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nlh = nlh0 - 2;
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/* Beware of unaligned access to nlh members. */
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memmove(nlh, nlh0, sizeof(*nlh));
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memcpy(NLMSG_DATA(nlh), "42", 2);
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rc = sendto(fd, nlh, NLMSG_HDRLEN + 2, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_DONE, flags=NLM_F_MULTI, seq=0"
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", pid=0}, \"\\x34\\x32\"}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, NLMSG_HDRLEN + 2, NLMSG_HDRLEN + 2, sprintrc(rc));
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/* NLMSG_DONE message with enough room for an integer payload */
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nlh = nlh0 - sizeof(num);
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*nlh = (struct nlmsghdr) {
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.nlmsg_len = NLMSG_HDRLEN + sizeof(num),
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.nlmsg_type = NLMSG_DONE,
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.nlmsg_flags = NLM_F_MULTI
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};
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memcpy(NLMSG_DATA(nlh), &num, sizeof(num));
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rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=NLMSG_DONE, flags=NLM_F_MULTI"
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", seq=0, pid=0}, %d}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
|
|
fd, nlh->nlmsg_len, num, nlh->nlmsg_len, sprintrc(rc));
|
|
}
|
|
|
|
#if defined NLM_F_CAPPED || defined NLM_F_ACK_TLVS
|
|
static void
|
|
test_ack_flags(const int fd)
|
|
{
|
|
long rc;
|
|
struct nlmsghdr nlh = {
|
|
.nlmsg_len = sizeof(nlh),
|
|
.nlmsg_type = NLMSG_ERROR,
|
|
};
|
|
|
|
#ifdef NLM_F_CAPPED
|
|
nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED,
|
|
rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
|
|
printf("sendto(%d, {len=%u, type=NLMSG_ERROR"
|
|
", flags=NLM_F_REQUEST|NLM_F_CAPPED, seq=0, pid=0}"
|
|
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
|
|
fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
|
|
#endif
|
|
|
|
#ifdef NLM_F_ACK_TLVS
|
|
nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK_TLVS;
|
|
rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
|
|
printf("sendto(%d, {len=%u, type=NLMSG_ERROR"
|
|
", flags=NLM_F_REQUEST|NLM_F_ACK_TLVS, seq=0, pid=0}"
|
|
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
|
|
fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
|
|
#endif
|
|
|
|
#if defined NLM_F_CAPPED && defined NLM_F_ACK_TLVS
|
|
nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED | NLM_F_ACK_TLVS;
|
|
rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
|
|
printf("sendto(%d, {len=%u, type=NLMSG_ERROR"
|
|
", flags=NLM_F_REQUEST|NLM_F_CAPPED|NLM_F_ACK_TLVS, seq=0, pid=0}"
|
|
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
|
|
fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
int main(void)
|
|
{
|
|
const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
|
|
|
|
char *path;
|
|
if (asprintf(&path, "/proc/self/fd/%u", fd) < 0)
|
|
perror_msg_and_fail("asprintf");
|
|
char buf[256];
|
|
if (getxattr(path, "system.sockprotoname", buf, sizeof(buf) - 1) < 0)
|
|
perror_msg_and_skip("getxattr");
|
|
free(path);
|
|
|
|
send_query(fd);
|
|
test_nlmsgerr(fd);
|
|
test_nlmsg_done(fd);
|
|
#if defined NLM_F_CAPPED || defined NLM_F_ACK_TLVS
|
|
test_ack_flags(fd);
|
|
#endif
|
|
|
|
puts("+++ exited with 0 +++");
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
SKIP_MAIN_UNDEFINED("HAVE_SYS_XATTR_H")
|
|
|
|
#endif
|