--- /dev/null
+/*
+ * Check decoding of netlink attribute.
+ *
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
+ * Copyright (c) 2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include "netlink.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/tcp.h>
+#include <linux/rtnetlink.h>
+#include <linux/sock_diag.h>
+#include <linux/unix_diag.h>
+
+#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
+# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
+#endif
+
+static void
+test_nlattr(const int fd)
+{
+ static const struct msg {
+ struct nlmsghdr nlh;
+ struct unix_diag_msg udm;
+ } c_msg = {
+ .nlh = {
+ .nlmsg_len = sizeof(struct msg),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP
+ },
+ .udm = {
+ .udiag_family = AF_UNIX,
+ .udiag_type = SOCK_STREAM,
+ .udiag_state = TCP_FIN_WAIT1
+ }
+ };
+ struct msg *msg;
+ struct nlattr *nla;
+ unsigned int msg_len;
+ long rc;
+
+ /* fetch fail: len < sizeof(struct nlattr) */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + 2;
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ memcpy(nla, "12", 2);
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, \"12\"}, %u"
+ ", MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, msg_len, sprintrc(rc));
+
+ /* fetch fail: short read */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
+ msg = tail_memdup(&c_msg, msg_len - 1);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, %p}, %u"
+ ", MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, (void *) msg + NLMSG_SPACE(sizeof(msg->udm)),
+ msg_len, sprintrc(rc));
+
+ /* print one struct nlattr */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = sizeof(*nla),
+ .nla_type = UNIX_DIAG_NAME
+ };
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
+ ", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
+
+ /* print one struct nlattr and some data */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 4;
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = NLA_HDRLEN + 4,
+ .nla_type = UNIX_DIAG_SHUTDOWN + 1
+ };
+ memcpy(RTA_DATA(nla), "1234", 4);
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {{nla_len=%u"
+ ", nla_type=%#x /* UNIX_DIAG_??? */}, \"1234\"}}"
+ ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
+ msg_len, sprintrc(rc));
+
+ /* print one struct nlattr and fetch fail second struct nlattr */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 2;
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = NLA_HDRLEN,
+ .nla_type = UNIX_DIAG_NAME
+ };
+ memcpy(nla + 1, "12", 2);
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
+ ", nla_type=UNIX_DIAG_NAME}, \"12\"]}, %u"
+ ", MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
+
+ /* print one struct nlattr and short read of second struct nlattr */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
+ msg = tail_memdup(&c_msg, msg_len - 1);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = NLA_HDRLEN,
+ .nla_type = UNIX_DIAG_NAME
+ };
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
+ ", nla_type=UNIX_DIAG_NAME}, %p]}, %u"
+ ", MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, nla + 1, msg_len, sprintrc(rc));
+
+ /* print two struct nlattr */
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = NLA_HDRLEN,
+ .nla_type = UNIX_DIAG_NAME
+ };
+ *(nla + 1) = (struct nlattr) {
+ .nla_len = NLA_HDRLEN,
+ .nla_type = UNIX_DIAG_PEER
+ };
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
+ ", nla_type=UNIX_DIAG_NAME}, {nla_len=%u"
+ ", nla_type=UNIX_DIAG_PEER}]}, %u"
+ ", MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, nla->nla_len,
+ msg_len, sprintrc(rc));
+
+ /* abbreviated output */
+#define DEFAULT_STRLEN 32
+#define ABBREV_LEN (DEFAULT_STRLEN + 1)
+ msg_len = NLA_HDRLEN * ABBREV_LEN + NLMSG_SPACE(sizeof(msg->udm));
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ unsigned int i;
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ for (i = 0; i < ABBREV_LEN; ++i)
+ nla[i] = (struct nlattr) {
+ .nla_len = NLA_HDRLEN,
+ .nla_type = UNIX_DIAG_SHUTDOWN + 1 + i
+ };
+
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}"
+ ", {udiag_family=AF_UNIX, udiag_type=SOCK_STREAM"
+ ", udiag_state=TCP_FIN_WAIT1, udiag_ino=0"
+ ", udiag_cookie=[0, 0]}, [",
+ fd, msg_len);
+ for (i = 0; i < DEFAULT_STRLEN; ++i) {
+ if (i)
+ printf(", ");
+ printf("{nla_len=%u, nla_type=%#x /* UNIX_DIAG_??? */}",
+ nla->nla_len, UNIX_DIAG_SHUTDOWN + 1 + i);
+ }
+ printf(", ...]}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ msg_len, sprintrc(rc));
+}
+
+static void
+test_nla_type(const int fd)
+{
+ static const struct msg {
+ struct nlmsghdr nlh;
+ struct unix_diag_msg udm;
+ } c_msg = {
+ .nlh = {
+ .nlmsg_len = sizeof(struct msg),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP
+ },
+ .udm = {
+ .udiag_family = AF_UNIX,
+ .udiag_type = SOCK_STREAM,
+ .udiag_state = TCP_FIN_WAIT1
+ }
+ };
+ struct msg *msg;
+ struct nlattr *nla;
+ unsigned int msg_len;
+ long rc;
+
+ msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
+ msg = tail_memdup(&c_msg, msg_len);
+ memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
+ nla = (void *) msg + NLMSG_SPACE(sizeof(msg->udm));
+ *nla = (struct nlattr) {
+ .nla_len = sizeof(*nla),
+ .nla_type = NLA_F_NESTED | UNIX_DIAG_NAME
+ };
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
+ ", nla_type=NLA_F_NESTED|UNIX_DIAG_NAME}}"
+ ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
+
+ nla->nla_type = NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
+ ", nla_type=NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
+ ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
+
+ nla->nla_type = NLA_F_NESTED | NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
+ rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
+ ", nla_type=NLA_F_NESTED|NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
+ ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
+
+ nla->nla_type = NLA_F_NESTED | (UNIX_DIAG_SHUTDOWN + 1);
+ rc = sendto(fd, msg, msg->nlh.nlmsg_len, MSG_DONTWAIT, NULL, 0);
+ printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+ ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
+ ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
+ ", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
+ ", nla_type=NLA_F_NESTED|%#x /* UNIX_DIAG_??? */}}"
+ ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+ fd, msg->nlh.nlmsg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
+ msg->nlh.nlmsg_len, sprintrc(rc));
+}
+
+int main(void)
+{
+ skip_if_unavailable("/proc/self/fd/");
+
+ const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
+
+ test_nlattr(fd);
+ test_nla_type(fd);
+
+ puts("+++ exited with 0 +++");
+
+ return 0;
+}
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