334 lines
13 KiB
C
334 lines
13 KiB
C
/*
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* Check decoding of netlink attribute.
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*
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* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
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* Copyright (c) 2017-2018 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 <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include "netlink.h"
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#include <linux/rtnetlink.h>
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#include <linux/sock_diag.h>
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#include <linux/unix_diag.h>
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static void
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test_nlattr(const int fd)
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{
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static const struct msg {
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struct nlmsghdr nlh;
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struct unix_diag_msg udm;
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} c_msg = {
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.nlh = {
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.nlmsg_len = sizeof(struct msg),
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.nlmsg_type = SOCK_DIAG_BY_FAMILY,
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.nlmsg_flags = NLM_F_DUMP
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},
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.udm = {
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.udiag_family = AF_UNIX,
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.udiag_type = SOCK_STREAM,
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.udiag_state = TCP_FIN_WAIT1
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}
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};
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struct msg *msg;
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struct nlattr *nla;
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unsigned int msg_len;
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long rc;
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/* fetch fail: len < sizeof(struct nlattr) */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + 2;
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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memcpy(nla, "12", 2);
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, \"\\x31\\x32\"}, %u"
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", MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, msg_len, sprintrc(rc));
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/* fetch fail: short read */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
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msg = tail_memdup(&c_msg, msg_len - 1);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, %p}, %u"
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", MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, (void *) msg + NLMSG_SPACE(sizeof(msg->udm)),
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msg_len, sprintrc(rc));
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/* print one struct nlattr */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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*nla = (struct nlattr) {
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.nla_len = sizeof(*nla),
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.nla_type = UNIX_DIAG_NAME
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};
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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/* print one struct nlattr with nla_len out of msg_len bounds */
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nla->nla_len += 8;
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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/* print one struct nlattr and some data */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 4;
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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*nla = (struct nlattr) {
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.nla_len = NLA_HDRLEN + 4,
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.nla_type = UNIX_DIAG_SHUTDOWN + 1
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};
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memcpy(RTA_DATA(nla), "1234", 4);
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {{nla_len=%u"
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", nla_type=%#x /* UNIX_DIAG_??? */}"
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", \"\\x31\\x32\\x33\\x34\"}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
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msg_len, sprintrc(rc));
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/* print one struct nlattr and fetch fail second struct nlattr */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 2;
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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SET_STRUCT(struct nlattr, nla,
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.nla_len = NLA_HDRLEN,
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.nla_type = UNIX_DIAG_NAME
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);
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memcpy(nla + 1, "12", 2);
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}, \"\\x31\\x32\"]}, %u"
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", MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, NLA_HDRLEN, msg_len, sprintrc(rc));
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/* print one struct nlattr and short read of second struct nlattr */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
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msg = tail_memdup(&c_msg, msg_len - 1);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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SET_STRUCT(struct nlattr, nla,
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.nla_len = NLA_HDRLEN,
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.nla_type = UNIX_DIAG_NAME
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);
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}, ... /* %p */]}, %u"
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", MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, NLA_HDRLEN, nla + 1, msg_len, sprintrc(rc));
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/* print two struct nlattr */
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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*nla = (struct nlattr) {
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.nla_len = NLA_HDRLEN,
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.nla_type = UNIX_DIAG_NAME
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};
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*(nla + 1) = (struct nlattr) {
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.nla_len = NLA_HDRLEN,
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.nla_type = UNIX_DIAG_PEER
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};
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}, {nla_len=%u"
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", nla_type=UNIX_DIAG_PEER}]}, %u"
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", MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, nla->nla_len,
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msg_len, sprintrc(rc));
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/* print first nlattr only when its nla_len is less than NLA_HDRLEN */
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nla->nla_len = NLA_HDRLEN - 1;
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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/* unrecognized attribute data, abbreviated output */
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#define ABBREV_LEN (DEFAULT_STRLEN + 1)
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * ABBREV_LEN * 2;
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msg = tail_alloc(msg_len);
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memcpy(msg, &c_msg, sizeof(c_msg));
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msg->nlh.nlmsg_len = msg_len;
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unsigned int i;
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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for (i = 0; i < ABBREV_LEN; ++i) {
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nla[i * 2] = (struct nlattr) {
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.nla_len = NLA_HDRLEN * 2 - 1,
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.nla_type = UNIX_DIAG_SHUTDOWN + 1 + i
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};
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fill_memory_ex(&nla[i * 2 + 1], NLA_HDRLEN,
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'0' + i, '~' - '0' - i);
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}
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}"
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", {udiag_family=AF_UNIX, udiag_type=SOCK_STREAM"
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", udiag_state=TCP_FIN_WAIT1, udiag_ino=0"
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", udiag_cookie=[0, 0]}, [",
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fd, msg_len);
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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("{{nla_len=%u, nla_type=%#x /* UNIX_DIAG_??? */}, ",
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nla->nla_len, UNIX_DIAG_SHUTDOWN + 1 + i);
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print_quoted_hex(&nla[i * 2 + 1], NLA_HDRLEN - 1);
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printf("}");
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}
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printf(", ...]}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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msg_len, sprintrc(rc));
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}
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static void
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test_nla_type(const int fd)
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{
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static const struct msg {
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struct nlmsghdr nlh;
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struct unix_diag_msg udm;
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} c_msg = {
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.nlh = {
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.nlmsg_len = sizeof(struct msg),
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.nlmsg_type = SOCK_DIAG_BY_FAMILY,
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.nlmsg_flags = NLM_F_DUMP
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},
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.udm = {
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.udiag_family = AF_UNIX,
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.udiag_type = SOCK_STREAM,
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.udiag_state = TCP_FIN_WAIT1
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}
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};
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struct msg *msg;
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struct nlattr *nla;
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unsigned int msg_len;
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long rc;
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msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
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msg = tail_memdup(&c_msg, msg_len);
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memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
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nla = NLMSG_ATTR(msg, sizeof(msg->udm));
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*nla = (struct nlattr) {
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.nla_len = sizeof(*nla),
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.nla_type = NLA_F_NESTED | UNIX_DIAG_NAME
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};
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=NLA_F_NESTED|UNIX_DIAG_NAME}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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nla->nla_type = NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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nla->nla_type = NLA_F_NESTED | NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
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rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=NLA_F_NESTED|NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
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nla->nla_type = NLA_F_NESTED | (UNIX_DIAG_SHUTDOWN + 1);
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rc = sendto(fd, msg, msg->nlh.nlmsg_len, MSG_DONTWAIT, NULL, 0);
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printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
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", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
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", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
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", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
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", nla_type=NLA_F_NESTED|%#x /* UNIX_DIAG_??? */}}"
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", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
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fd, msg->nlh.nlmsg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
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msg->nlh.nlmsg_len, sprintrc(rc));
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}
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int main(void)
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{
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skip_if_unavailable("/proc/self/fd/");
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const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
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test_nlattr(fd);
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test_nla_type(fd);
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puts("+++ exited with 0 +++");
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return 0;
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}
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