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      1 /*
      2  * This file is part of inet-yy 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 <errno.h>
     32 #include <string.h>
     33 #include <unistd.h>
     34 #include <netinet/in.h>
     35 #include <linux/netlink.h>
     36 #include <linux/sock_diag.h>
     37 #include <linux/inet_diag.h>
     38 
     39 static void
     40 send_query(const int fd, const int family, const int proto)
     41 {
     42 	struct sockaddr_nl nladdr = {
     43 		.nl_family = AF_NETLINK
     44 	};
     45 	struct {
     46 		struct nlmsghdr nlh;
     47 		struct inet_diag_req_v2 idr;
     48 	} req = {
     49 		.nlh = {
     50 			.nlmsg_len = sizeof(req),
     51 			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
     52 			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
     53 		},
     54 		.idr = {
     55 			.sdiag_family = family,
     56 			.sdiag_protocol = proto,
     57 			.idiag_states = -1
     58 		}
     59 	};
     60 	struct iovec iov = {
     61 		.iov_base = &req,
     62 		.iov_len = sizeof(req)
     63 	};
     64 	struct msghdr msg = {
     65 		.msg_name = (void *) &nladdr,
     66 		.msg_namelen = sizeof(nladdr),
     67 		.msg_iov = &iov,
     68 		.msg_iovlen = 1
     69 	};
     70 
     71 	if (sendmsg(fd, &msg, 0) <= 0)
     72 		perror_msg_and_skip("sendmsg");
     73 }
     74 
     75 static void
     76 check_responses(const int fd)
     77 {
     78 	static union {
     79 		struct nlmsghdr hdr;
     80 		long buf[8192 / sizeof(long)];
     81 	} hdr_buf;
     82 
     83 	struct sockaddr_nl nladdr = {
     84 		.nl_family = AF_NETLINK
     85 	};
     86 	struct iovec iov = {
     87 		.iov_base = hdr_buf.buf,
     88 		.iov_len = sizeof(hdr_buf.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 		perror_msg_and_skip("recvmsg");
    100 
    101 	struct nlmsghdr *h = &hdr_buf.hdr;
    102 	if (!NLMSG_OK(h, ret))
    103 		error_msg_and_skip("!NLMSG_OK");
    104 	if (h->nlmsg_type == NLMSG_ERROR) {
    105 		const struct nlmsgerr *err = NLMSG_DATA(h);
    106 		if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
    107 			error_msg_and_skip("NLMSG_ERROR");
    108 		errno = -err->error;
    109 		perror_msg_and_skip("NLMSG_ERROR");
    110 	}
    111 	if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
    112 		error_msg_and_skip("unexpected nlmsg_type %u",
    113 				   (unsigned) h->nlmsg_type);
    114 
    115 	const struct inet_diag_msg *diag = NLMSG_DATA(h);
    116 	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
    117 		error_msg_and_skip("short response");
    118 }
    119 
    120 int main(void)
    121 {
    122 	struct sockaddr_in addr;
    123 	socklen_t len = sizeof(addr);
    124 
    125 	memset(&addr, 0, sizeof(addr));
    126 	addr.sin_family = AF_INET;
    127 	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    128 
    129 	close(0);
    130 	close(1);
    131 
    132 	if (socket(AF_INET, SOCK_STREAM, 0))
    133 		perror_msg_and_skip("socket AF_INET");
    134 	if (bind(0, (struct sockaddr *) &addr, len))
    135 		perror_msg_and_skip("bind");
    136 	if (listen(0, 5))
    137 		perror_msg_and_skip("listen");
    138 	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG) != 1)
    139 		perror_msg_and_skip("socket AF_NETLINK");
    140 
    141 	send_query(1, AF_INET, IPPROTO_TCP);
    142 	check_responses(1);
    143 	return 0;
    144 }
    145