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      1 /*
      2  * Copyright (c) 2014-2015 Dmitry V. Levin <ldv (at) altlinux.org>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <assert.h>
     29 #include <stddef.h>
     30 #include <stdint.h>
     31 #include <string.h>
     32 #include <unistd.h>
     33 #include <sys/socket.h>
     34 #include <sys/un.h>
     35 #include <linux/netlink.h>
     36 #include <linux/sock_diag.h>
     37 #include <linux/unix_diag.h>
     38 
     39 #if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
     40 # define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
     41 #endif
     42 
     43 static int
     44 send_query(const int fd, const int family, const int proto)
     45 {
     46 	struct sockaddr_nl nladdr = {
     47 		.nl_family = AF_NETLINK
     48 	};
     49 	struct {
     50 		struct nlmsghdr nlh;
     51 		struct unix_diag_req udr;
     52 	} req = {
     53 		.nlh = {
     54 			.nlmsg_len = sizeof(req),
     55 			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
     56 			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
     57 		},
     58 		.udr = {
     59 			.sdiag_family = family,
     60 			.sdiag_protocol = proto,
     61 			.udiag_states = -1,
     62 			.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
     63 		}
     64 	};
     65 	struct iovec iov = {
     66 		.iov_base = &req,
     67 		.iov_len = sizeof(req)
     68 	};
     69 	struct msghdr msg = {
     70 		.msg_name = (void*)&nladdr,
     71 		.msg_namelen = sizeof(nladdr),
     72 		.msg_iov = &iov,
     73 		.msg_iovlen = 1
     74 	};
     75 
     76 	return sendmsg(fd, &msg, 0) > 0;
     77 }
     78 
     79 static int
     80 check_responses(const int fd)
     81 {
     82 	static char buf[8192];
     83 	struct sockaddr_nl nladdr = {
     84 		.nl_family = AF_NETLINK
     85 	};
     86 	struct iovec iov = {
     87 		.iov_base = buf,
     88 		.iov_len = sizeof(buf)
     89 	};
     90 	struct msghdr msg = {
     91 		.msg_name = (void*)&nladdr,
     92 		.msg_namelen = sizeof(nladdr),
     93 		.msg_iov = &iov,
     94 		.msg_iovlen = 1
     95 	};
     96 
     97 	ssize_t ret = recvmsg(fd, &msg, 0);
     98 	if (ret <= 0)
     99 		return 0;
    100 
    101 	struct nlmsghdr *h = (struct nlmsghdr*)buf;
    102 	return (NLMSG_OK(h, ret) &&
    103 		h->nlmsg_type != NLMSG_ERROR &&
    104 		h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
    105 }
    106 
    107 #define SUN_PATH "netlink_unix_diag_socket"
    108 int main(void)
    109 {
    110 	struct sockaddr_un addr = {
    111 		.sun_family = AF_UNIX,
    112 		.sun_path = SUN_PATH
    113 	};
    114 	socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
    115 
    116 	close(0);
    117 	close(1);
    118 
    119 	(void) unlink(SUN_PATH);
    120 	if (socket(PF_LOCAL, SOCK_STREAM, 0) ||
    121 	    bind(0, (struct sockaddr *) &addr, len) ||
    122 	    listen(0, 5))
    123 		return 77;
    124 
    125 	assert(unlink(SUN_PATH) == 0);
    126 
    127 	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
    128 		return 77;
    129 
    130 	return (send_query(1, AF_UNIX, 0) &&
    131 		check_responses(1)) ? 0 : 77;
    132 }
    133