tests/net/net/t_pktinfo.c

   1 /*      $NetBSD: t_pktinfo.c,v 1.2 2013/10/19 17:45:01 christos Exp $   */
   2
   3 /*-
   4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: t_pktinfo.c,v 1.2 2013/10/19 17:45:01 christos Exp $");
  33
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <stdlib.h>
  39 #include <unistd.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <errno.h>
  43
  44 static const char traffic[] = "foo";
  45
  46 #ifdef TEST
  47 #include <err.h>
  48 #define ERR(msg) err(EXIT_FAILURE, msg)
  49 #define ERRX(msg, a) errx(EXIT_FAILURE, msg, a)
  50 #define ERRX2(msg, a1, a2) errx(EXIT_FAILURE, msg, a1, a2)
  51 #else
  52 #include <atf-c.h>
  53 #define ERR(msg) ATF_REQUIRE_MSG(0, "%s: %s", msg, strerror(errno))
  54 #define ERRX(msg, a) ATF_REQUIRE_MSG(0, msg, a)
  55 #define ERRX2(msg, a1, a2) ATF_REQUIRE_MSG(0, msg, a1, a2)
  56 #endif
  57
  58 static int
  59 server(struct sockaddr_in *sin) {
  60         int s, one;
  61         socklen_t len = sizeof(*sin);
  62
  63         if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
  64                 ERR("socket");
  65
  66         memset(sin, 0, len);
  67         sin->sin_family = AF_INET;
  68         sin->sin_len = len;
  69         sin->sin_port = 0;
  70         sin->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  71
  72         if (bind(s, (const struct sockaddr *)sin, len) == -1)
  73                 ERR("bind");
  74
  75         if (getsockname(s, (struct sockaddr *)sin, &len) == -1)
  76                 ERR("getsockname");
  77
  78         one = 1;
  79         if (setsockopt(s, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)) == -1)
  80                 ERR("setsockopt");
  81         if (setsockopt(s, IPPROTO_IP, IP_RECVPKTINFO, &one, sizeof(one)) == -1)
  82                 ERR("setsockopt");
  83
  84         return s;
  85 }
  86
  87 static int
  88 client(struct sockaddr_in *sin) {
  89         int s;
  90
  91         if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
  92                 ERR("socket");
  93         if (sendto(s, traffic, sizeof(traffic), 0,
  94             (const struct sockaddr *)sin, sizeof(*sin)) == -1)
  95                 ERR("sendto");
  96         return s;
  97 }
  98
  99 static void
 100 receive(int s) {
 101         struct msghdr msg;
 102         struct cmsghdr *cmsg;
 103         struct iovec iov;
 104         char buf[sizeof(traffic)];
 105         struct in_pktinfo *ipi;
 106         char control[CMSG_SPACE(sizeof(*ipi)) * 2];
 107
 108         memset(&msg, 0, sizeof(msg));
 109         msg.msg_name = NULL;
 110         msg.msg_namelen = 0;
 111         msg.msg_iov = &iov;
 112         memset(&iov, 0, sizeof(iov));
 113         iov.iov_base = buf;
 114         iov.iov_len = sizeof(buf);
 115         msg.msg_iovlen = 1;
 116         msg.msg_control = control;
 117         msg.msg_controllen = sizeof(control);
 118         msg.msg_flags = 0;
 119
 120         if (recvmsg(s, &msg, 0) == -1)
 121                 ERR("recvmsg");
 122
 123         for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
 124             cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 125                 if (cmsg->cmsg_level != IPPROTO_IP)
 126                         ERRX("bad level %d", cmsg->cmsg_level);
 127                 const char *m;
 128                 switch (cmsg->cmsg_type) {
 129                 case IP_PKTINFO:
 130                         m = "pktinfo";
 131                         break;
 132                 case IP_RECVPKTINFO:
 133                         m = "recvpktinfo";
 134                         break;
 135                 default:
 136                         m = NULL;
 137                         ERRX("bad type %d", cmsg->cmsg_type);
 138                 }
 139                 ipi = (void *)CMSG_DATA(cmsg);
 140 #ifdef TEST
 141                 printf("%s message received on address %s at interface %d\n",
 142                     m, inet_ntoa(ipi->ipi_addr), ipi->ipi_ifindex);
 143 #else
 144                 __USE(m);
 145                 ATF_REQUIRE_MSG(ipi->ipi_addr.s_addr == htonl(INADDR_LOOPBACK),
 146                         "address 0x%x != 0x%x", ipi->ipi_addr.s_addr,
 147                         htonl(INADDR_LOOPBACK));
 148 #endif
 149         }
 150
 151         if (strcmp(traffic, buf) != 0)
 152                 ERRX2("Bad message '%s' != '%s'", buf, traffic);
 153 }
 154
 155 static void
 156 doit(void)
 157 {
 158         struct sockaddr_in sin;
 159         int s, c;
 160         s = server(&sin);
 161         c = client(&sin);
 162         receive(s);
 163         close(s);
 164         close(c);
 165 }
 166
 167 #ifndef TEST
 168 ATF_TC(pktinfo);
 169 ATF_TC_HEAD(pktinfo, tc)
 170 {
 171
 172         atf_tc_set_md_var(tc, "descr", "Check that IP_PKTINFO and "
 173             "IP_RECVPKTINFO work");
 174 }
 175
 176 ATF_TC_BODY(pktinfo, tc)
 177 {
 178         doit();
 179 }
 180
 181 ATF_TP_ADD_TCS(tp)
 182 {
 183
 184         ATF_TP_ADD_TC(tp, pktinfo);
 185         return atf_no_error();
 186 }
 187 #else
 188
 189 int
 190 main(int argc, char *argv[]) {
 191         doit();
 192         return 0;
 193 }
 194 #endif