tests-mx32/nlattr.c - platform/external/strace - Git at Google

 /*
  * Check decoding of netlink attribute.
  *
  * Copyright (c) 2017 JingPiao Chen <[email protected]>
  * Copyright (c) 2017-2018 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 <stdio.h>
 #include <stdint.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <netinet/tcp.h>
 #include "netlink.h"
 #include <linux/rtnetlink.h>
 #include <linux/sock_diag.h>
 #include <linux/unix_diag.h>

 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 = NLMSG_ATTR(msg, 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]}, \"\\x31\\x32\"}, %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 = NLMSG_ATTR(msg, 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 with nla_len out of msg_len bounds */
 	nla->nla_len += 8;
 	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 = NLMSG_ATTR(msg, 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_??? */}"
 	       ", \"\\x31\\x32\\x33\\x34\"}}"
 	       ", %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 = NLMSG_ATTR(msg, sizeof(msg->udm));
 	SET_STRUCT(struct nlattr, nla,
 		.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}, \"\\x31\\x32\"]}, %u"
 	       ", MSG_DONTWAIT, NULL, 0) = %s\n",
 	       fd, msg_len, NLA_HDRLEN, 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 = NLMSG_ATTR(msg, sizeof(msg->udm));
 	SET_STRUCT(struct nlattr, nla,
 		.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_HDRLEN, 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 = NLMSG_ATTR(msg, 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));

 	/* print first nlattr only when its nla_len is less than NLA_HDRLEN */
 	nla->nla_len = NLA_HDRLEN - 1;
 	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));

 	/* unrecognized attribute data, abbreviated output */
 #define ABBREV_LEN (DEFAULT_STRLEN + 1)
 	msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * ABBREV_LEN * 2;
 	msg = tail_alloc(msg_len);
 	memcpy(msg, &c_msg, sizeof(c_msg));
 	msg->nlh.nlmsg_len = msg_len;
 	unsigned int i;
 	nla = NLMSG_ATTR(msg, sizeof(msg->udm));
 	for (i = 0; i < ABBREV_LEN; ++i) {
 		nla[i * 2] = (struct nlattr) {
 			.nla_len = NLA_HDRLEN * 2 - 1,
 			.nla_type = UNIX_DIAG_SHUTDOWN + 1 + i
 		};
 		fill_memory_ex(&nla[i * 2 + 1], NLA_HDRLEN,
 			       '0' + i, '~' - '0' - 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);
 		print_quoted_hex(&nla[i * 2 + 1], NLA_HDRLEN - 1);
 		printf("}");
 	}
 	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 = NLMSG_ATTR(msg, 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;
 }
	/*
	* Check decoding of netlink attribute.
	*
	* Copyright (c) 2017 JingPiao Chen <[email protected]>
	* Copyright (c) 2017-2018 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 <stdio.h>
	#include <stdint.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/socket.h>
	#include <netinet/tcp.h>
	#include "netlink.h"
	#include <linux/rtnetlink.h>
	#include <linux/sock_diag.h>
	#include <linux/unix_diag.h>

	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 = NLMSG_ATTR(msg, 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]}, \"\\x31\\x32\"}, %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 = NLMSG_ATTR(msg, 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 with nla_len out of msg_len bounds */
	nla->nla_len += 8;
	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 = NLMSG_ATTR(msg, 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_??? */}"
	", \"\\x31\\x32\\x33\\x34\"}}"
	", %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 = NLMSG_ATTR(msg, sizeof(msg->udm));
	SET_STRUCT(struct nlattr, nla,
	.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}, \"\\x31\\x32\"]}, %u"
	", MSG_DONTWAIT, NULL, 0) = %s\n",
	fd, msg_len, NLA_HDRLEN, 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 = NLMSG_ATTR(msg, sizeof(msg->udm));
	SET_STRUCT(struct nlattr, nla,
	.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_HDRLEN, 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 = NLMSG_ATTR(msg, 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));

	/* print first nlattr only when its nla_len is less than NLA_HDRLEN */
	nla->nla_len = NLA_HDRLEN - 1;
	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));

	/* unrecognized attribute data, abbreviated output */
	#define ABBREV_LEN (DEFAULT_STRLEN + 1)
	msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * ABBREV_LEN * 2;
	msg = tail_alloc(msg_len);
	memcpy(msg, &c_msg, sizeof(c_msg));
	msg->nlh.nlmsg_len = msg_len;
	unsigned int i;
	nla = NLMSG_ATTR(msg, sizeof(msg->udm));
	for (i = 0; i < ABBREV_LEN; ++i) {
	nla[i * 2] = (struct nlattr) {
	.nla_len = NLA_HDRLEN * 2 - 1,
	.nla_type = UNIX_DIAG_SHUTDOWN + 1 + i
	};
	fill_memory_ex(&nla[i * 2 + 1], NLA_HDRLEN,
	'0' + i, '~' - '0' - 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);
	print_quoted_hex(&nla[i * 2 + 1], NLA_HDRLEN - 1);
	printf("}");
	}
	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 = NLMSG_ATTR(msg, 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;
	}