2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
31 #include <netinet/in.h>
32 #include <linux/netlink.h>
33 #include <linux/sock_diag.h>
34 #include <linux/inet_diag.h>
37 send_query(const int fd, const int family, const int proto)
39 struct sockaddr_nl nladdr = {
40 .nl_family = AF_NETLINK
44 struct inet_diag_req_v2 idr;
47 .nlmsg_len = sizeof(req),
48 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
49 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
52 .sdiag_family = family,
53 .sdiag_protocol = proto,
59 .iov_len = sizeof(req)
62 .msg_name = (void*)&nladdr,
63 .msg_namelen = sizeof(nladdr),
68 return sendmsg(fd, &msg, 0) > 0;
72 check_responses(const int fd)
74 static char buf[8192];
75 struct sockaddr_nl nladdr = {
76 .nl_family = AF_NETLINK
80 .iov_len = sizeof(buf)
83 .msg_name = (void*)&nladdr,
84 .msg_namelen = sizeof(nladdr),
89 ssize_t ret = recvmsg(fd, &msg, 0);
93 struct nlmsghdr *h = (struct nlmsghdr*)buf;
94 return (NLMSG_OK(h, ret) &&
95 h->nlmsg_type != NLMSG_ERROR &&
96 h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
101 struct sockaddr_in addr;
102 socklen_t len = sizeof(addr);
104 memset(&addr, 0, sizeof(addr));
105 addr.sin_family = AF_INET;
106 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
111 if (socket(PF_INET, SOCK_STREAM, 0) ||
112 bind(0, (struct sockaddr *) &addr, len) ||
114 socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG) != 1)
117 return (send_query(1, AF_INET, IPPROTO_TCP) &&
118 check_responses(1)) ? 0 : 77;