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