1/* 2 * This file is part of net-yy-netlink strace test. 3 * 4 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org> 5 * Copyright (c) 2016 Fabien Siron <fabien.siron@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 "netlink.h" 37#include <linux/sock_diag.h> 38#include <linux/netlink_diag.h> 39 40static void 41send_query(const int fd) 42{ 43 struct sockaddr_nl nladdr = { 44 .nl_family = AF_NETLINK 45 }; 46 struct { 47 struct nlmsghdr nlh; 48 struct netlink_diag_req ndr; 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 .ndr = { 56 .sdiag_family = AF_NETLINK, 57 .sdiag_protocol = NDIAG_PROTO_ALL, 58 .ndiag_show = NDIAG_SHOW_MEMINFO 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 76static void 77check_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 netlink_diag_msg *diag = NLMSG_DATA(h); 117 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag))) 118 error_msg_and_skip("short response"); 119} 120 121int main(void) 122{ 123 struct sockaddr_nl addr; 124 socklen_t len = sizeof(addr); 125 126 memset(&addr, 0, sizeof(addr)); 127 addr.nl_family = AF_NETLINK; 128 129 close(0); 130 close(1); 131 132 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG)) 133 perror_msg_and_skip("socket AF_NETLINK"); 134 if (bind(0, (struct sockaddr *) &addr, len)) 135 perror_msg_and_skip("bind"); 136 137 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1) 138 perror_msg_and_skip("socket AF_NETLINK"); 139 140 send_query(1); 141 check_responses(1); 142 return 0; 143} 144