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      1 /*
      2  * This file is part of net-yy-unix strace test.
      3  *
      4  * Copyright (c) 2014-2016 Dmitry V. Levin <ldv (at) altlinux.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "tests.h"
     31 #include <assert.h>
     32 #include <errno.h>
     33 #include <stddef.h>
     34 #include <stdint.h>
     35 #include <string.h>
     36 #include <unistd.h>
     37 #include <sys/socket.h>
     38 #include <sys/un.h>
     39 #include <linux/netlink.h>
     40 #include <linux/sock_diag.h>
     41 #include <linux/unix_diag.h>
     42 
     43 #if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
     44 # define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
     45 #endif
     46 
     47 static void
     48 send_query(const int fd)
     49 {
     50 	struct sockaddr_nl nladdr = {
     51 		.nl_family = AF_NETLINK
     52 	};
     53 	struct {
     54 		struct nlmsghdr nlh;
     55 		struct unix_diag_req udr;
     56 	} req = {
     57 		.nlh = {
     58 			.nlmsg_len = sizeof(req),
     59 			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
     60 			.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP
     61 		},
     62 		.udr = {
     63 			.sdiag_family = AF_UNIX,
     64 			.udiag_states = -1,
     65 			.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
     66 		}
     67 	};
     68 	struct iovec iov = {
     69 		.iov_base = &req,
     70 		.iov_len = sizeof(req)
     71 	};
     72 	struct msghdr msg = {
     73 		.msg_name = (void *) &nladdr,
     74 		.msg_namelen = sizeof(nladdr),
     75 		.msg_iov = &iov,
     76 		.msg_iovlen = 1
     77 	};
     78 
     79 	if (sendmsg(fd, &msg, 0) <= 0)
     80 		perror_msg_and_skip("sendmsg");
     81 }
     82 
     83 static void
     84 check_responses(const int fd)
     85 {
     86 	static union {
     87 		struct nlmsghdr hdr;
     88 		long buf[8192 / sizeof(long)];
     89 	} hdr_buf;
     90 
     91 	struct sockaddr_nl nladdr = {
     92 		.nl_family = AF_NETLINK
     93 	};
     94 	struct iovec iov = {
     95 		.iov_base = hdr_buf.buf,
     96 		.iov_len = sizeof(hdr_buf.buf)
     97 	};
     98 	struct msghdr msg = {
     99 		.msg_name = (void *) &nladdr,
    100 		.msg_namelen = sizeof(nladdr),
    101 		.msg_iov = &iov,
    102 		.msg_iovlen = 1
    103 	};
    104 
    105 	ssize_t ret = recvmsg(fd, &msg, 0);
    106 	if (ret <= 0)
    107 		perror_msg_and_skip("recvmsg");
    108 
    109 	struct nlmsghdr *h = &hdr_buf.hdr;
    110 	if (!NLMSG_OK(h, ret))
    111 		error_msg_and_skip("!NLMSG_OK");
    112 	if (h->nlmsg_type == NLMSG_ERROR) {
    113 		const struct nlmsgerr *err = NLMSG_DATA(h);
    114 		if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
    115 			error_msg_and_skip("NLMSG_ERROR");
    116 		errno = -err->error;
    117 		perror_msg_and_skip("NLMSG_ERROR");
    118 	}
    119 	if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
    120 		error_msg_and_skip("unexpected nlmsg_type %u",
    121 				   (unsigned) h->nlmsg_type);
    122 
    123 	const struct unix_diag_msg *diag = NLMSG_DATA(h);
    124 	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
    125 		error_msg_and_skip("short response");
    126 }
    127 
    128 #define SUN_PATH "netlink_unix_diag_socket"
    129 int main(void)
    130 {
    131 	struct sockaddr_un addr = {
    132 		.sun_family = AF_UNIX,
    133 		.sun_path = SUN_PATH
    134 	};
    135 	socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
    136 
    137 	close(0);
    138 	close(1);
    139 
    140 	(void) unlink(SUN_PATH);
    141 	if (socket(AF_UNIX, SOCK_STREAM, 0))
    142 		perror_msg_and_skip("socket AF_UNIX");
    143 	if (bind(0, (struct sockaddr *) &addr, len))
    144 		perror_msg_and_skip("bind");
    145 	if (listen(0, 5))
    146 		perror_msg_and_skip("listen");
    147 
    148 	assert(unlink(SUN_PATH) == 0);
    149 
    150 	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
    151 		perror_msg_and_skip("socket AF_NETLINK");
    152 
    153 	send_query(1);
    154 	check_responses(1);
    155 	return 0;
    156 }
    157