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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  * Copyright (c) 2014-2017 The strace developers.
      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 "netlink.h"
     37 #include <linux/sock_diag.h>
     38 #include <linux/inet_diag.h>
     39 
     40 static void
     41 send_query(const int fd, const int family, const int proto)
     42 {
     43 	struct sockaddr_nl nladdr = {
     44 		.nl_family = AF_NETLINK
     45 	};
     46 	struct {
     47 		struct nlmsghdr nlh;
     48 		struct inet_diag_req_v2 idr;
     49 	} req = {
     50 		.nlh = {
     51 			.nlmsg_len = sizeof(req),
     52 			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
     53 			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
     54 		},
     55 		.idr = {
     56 			.sdiag_family = family,
     57 			.sdiag_protocol = proto,
     58 			.idiag_states = -1
     59 		}
     60 	};
     61 	struct iovec iov = {
     62 		.iov_base = &req,
     63 		.iov_len = sizeof(req)
     64 	};
     65 	struct msghdr msg = {
     66 		.msg_name = (void *) &nladdr,
     67 		.msg_namelen = sizeof(nladdr),
     68 		.msg_iov = &iov,
     69 		.msg_iovlen = 1
     70 	};
     71 
     72 	if (sendmsg(fd, &msg, 0) <= 0)
     73 		perror_msg_and_skip("sendmsg");
     74 }
     75 
     76 static void
     77 check_responses(const int fd)
     78 {
     79 	static union {
     80 		struct nlmsghdr hdr;
     81 		long buf[8192 / sizeof(long)];
     82 	} hdr_buf;
     83 
     84 	struct sockaddr_nl nladdr = {
     85 		.nl_family = AF_NETLINK
     86 	};
     87 	struct iovec iov = {
     88 		.iov_base = hdr_buf.buf,
     89 		.iov_len = sizeof(hdr_buf.buf)
     90 	};
     91 	struct msghdr msg = {
     92 		.msg_name = (void *) &nladdr,
     93 		.msg_namelen = sizeof(nladdr),
     94 		.msg_iov = &iov,
     95 		.msg_iovlen = 1
     96 	};
     97 
     98 	ssize_t ret = recvmsg(fd, &msg, 0);
     99 	if (ret <= 0)
    100 		perror_msg_and_skip("recvmsg");
    101 
    102 	struct nlmsghdr *h = &hdr_buf.hdr;
    103 	if (!NLMSG_OK(h, ret))
    104 		error_msg_and_skip("!NLMSG_OK");
    105 	if (h->nlmsg_type == NLMSG_ERROR) {
    106 		const struct nlmsgerr *err = NLMSG_DATA(h);
    107 		if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
    108 			error_msg_and_skip("NLMSG_ERROR");
    109 		errno = -err->error;
    110 		perror_msg_and_skip("NLMSG_ERROR");
    111 	}
    112 	if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
    113 		error_msg_and_skip("unexpected nlmsg_type %u",
    114 				   (unsigned) h->nlmsg_type);
    115 
    116 	const struct inet_diag_msg *diag = NLMSG_DATA(h);
    117 	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
    118 		error_msg_and_skip("short response");
    119 }
    120 
    121 int main(void)
    122 {
    123 	struct sockaddr_in addr;
    124 	socklen_t len = sizeof(addr);
    125 
    126 	memset(&addr, 0, sizeof(addr));
    127 	addr.sin_family = AF_INET;
    128 	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    129 
    130 	close(0);
    131 	close(1);
    132 
    133 	if (socket(AF_INET, SOCK_STREAM, 0))
    134 		perror_msg_and_skip("socket AF_INET");
    135 	if (bind(0, (struct sockaddr *) &addr, len))
    136 		perror_msg_and_skip("bind");
    137 	if (listen(0, 5))
    138 		perror_msg_and_skip("listen");
    139 	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG) != 1)
    140 		perror_msg_and_skip("socket AF_NETLINK");
    141 
    142 	send_query(1, AF_INET, IPPROTO_TCP);
    143 	check_responses(1);
    144 	return 0;
    145 }
    146