1 /*
2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "tests.h"
30 #include <assert.h>
31 #include <fcntl.h>
32 #include <stdio.h>
33 #include <stdint.h>
34 #include <unistd.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38
39 static void
print_pktinfo(const struct cmsghdr * c)40 print_pktinfo(const struct cmsghdr *c)
41 {
42 printf("IP_PKTINFO, cmsg_data={ipi_ifindex=%s"
43 ", ipi_spec_dst=inet_addr(\"%s\")"
44 ", ipi_addr=inet_addr(\"%s\")}",
45 IFINDEX_LO_STR, "127.0.0.1", "127.0.0.1");
46 }
47
48 static void
print_ttl(const struct cmsghdr * c)49 print_ttl(const struct cmsghdr *c)
50 {
51 const unsigned int *ttl = (const unsigned int *) CMSG_DATA(c);
52
53 printf("IP_TTL, cmsg_data=[%u]", *ttl);
54 }
55
56 static void
print_tos(const struct cmsghdr * c)57 print_tos(const struct cmsghdr *c)
58 {
59 const uint8_t *tos = (const uint8_t *) CMSG_DATA(c);
60
61 printf("IP_TOS, cmsg_data=[%#x]", *tos);
62 }
63
64 static void
print_opts(const char * name,const struct cmsghdr * c)65 print_opts(const char *name, const struct cmsghdr *c)
66 {
67 const unsigned char *opts = (const unsigned char *) CMSG_DATA(c);
68 const size_t len = c->cmsg_len - CMSG_ALIGN(sizeof(*c));
69
70 printf("%s", name);
71 if (len) {
72 printf(", cmsg_data=[");
73 size_t i;
74 for (i = 0; i < len; ++i)
75 printf("%s0x%02x", i ? ", " : "", opts[i]);
76 printf("]");
77 }
78 }
79
80 #ifdef IP_ORIGDSTADDR
81 static void
print_origdstaddr(const struct cmsghdr * c)82 print_origdstaddr(const struct cmsghdr *c)
83 {
84 const struct sockaddr_in *sin =
85 (const struct sockaddr_in *) CMSG_DATA(c);
86
87 printf("IP_ORIGDSTADDR, cmsg_data={sa_family=AF_INET, sin_port=htons(%u)"
88 ", sin_addr=inet_addr(\"127.0.0.1\")}", ntohs(sin->sin_port));
89 }
90 #endif
91
92 int
main(void)93 main(void)
94 {
95 int i;
96 while ((i = open("/dev/null", O_RDWR)) < 3)
97 assert(i >= 0);
98 assert(!close(0));
99 assert(!close(3));
100
101 if (socket(AF_INET, SOCK_DGRAM, 0))
102 perror_msg_and_skip("socket");
103 struct sockaddr_in addr = {
104 .sin_family = AF_INET,
105 .sin_addr.s_addr = htonl(INADDR_LOOPBACK)
106 };
107 socklen_t len = sizeof(addr);
108 if (bind(0, (struct sockaddr *) &addr, len))
109 perror_msg_and_skip("bind");
110 assert(!getsockname(0, (struct sockaddr *) &addr, &len));
111
112 assert(socket(AF_INET, SOCK_DGRAM, 0) == 3);
113 assert(!connect(3, (struct sockaddr *) &addr, len));
114
115 const int opt_1 = htonl(0x01000000);
116 #define SETSOCKOPT(fd, name) assert(!setsockopt(fd, IPPROTO_IP, (name), &opt_1, sizeof(opt_1)))
117 SETSOCKOPT(3, IP_OPTIONS);
118 SETSOCKOPT(0, IP_PKTINFO);
119 SETSOCKOPT(0, IP_RECVTTL);
120 SETSOCKOPT(0, IP_RECVTOS);
121 SETSOCKOPT(0, IP_RECVOPTS);
122 SETSOCKOPT(0, IP_RETOPTS);
123 #ifdef IP_RECVORIGDSTADDR
124 SETSOCKOPT(0, IP_RECVORIGDSTADDR);
125 #endif
126
127 static const char data[] = "data";
128 const size_t size = sizeof(data) - 1;
129 assert(send(3, data, size, 0) == (int) size);
130 assert(!close(3));
131
132 char buf[size];
133 struct iovec iov = {
134 .iov_base = buf,
135 .iov_len = sizeof(buf)
136 };
137 struct cmsghdr control[16];
138 struct msghdr mh = {
139 .msg_name = &addr,
140 .msg_namelen = len,
141 .msg_iov = &iov,
142 .msg_iovlen = 1,
143 .msg_control = control,
144 .msg_controllen = sizeof(control)
145 };
146
147 assert(recvmsg(0, &mh, 0) == (int) size);
148 assert(!close(0));
149
150 printf("recvmsg(0, {msg_name={sa_family=AF_INET, sin_port=htons(%u)"
151 ", sin_addr=inet_addr(\"127.0.0.1\")}, msg_namelen=%u"
152 ", msg_iov=[{iov_base=\"%s\", iov_len=%u}], msg_iovlen=1"
153 ", msg_control=[",
154 ntohs(addr.sin_port), (unsigned) mh.msg_namelen,
155 data, (unsigned) size);
156
157 struct cmsghdr *c;
158 for (c = CMSG_FIRSTHDR(&mh); c; c = CMSG_NXTHDR(&mh, c)) {
159 if (IPPROTO_IP != c->cmsg_level)
160 continue;
161 if (c != control)
162 printf(", ");
163 printf("{cmsg_len=%lu, cmsg_level=SOL_IP, cmsg_type=",
164 (unsigned long) c->cmsg_len);
165 switch (c->cmsg_type) {
166 case IP_PKTINFO:
167 print_pktinfo(c);
168 break;
169 case IP_TTL:
170 print_ttl(c);
171 break;
172 case IP_TOS:
173 print_tos(c);
174 break;
175 case IP_RECVOPTS:
176 print_opts("IP_RECVOPTS", c);
177 break;
178 case IP_RETOPTS:
179 print_opts("IP_RETOPTS", c);
180 break;
181 #ifdef IP_ORIGDSTADDR
182 case IP_ORIGDSTADDR:
183 print_origdstaddr(c);
184 break;
185 #endif
186 default:
187 printf("%d", c->cmsg_type);
188 break;
189 }
190 printf("}");
191 }
192 printf("], msg_controllen=%lu, msg_flags=0}, 0) = %u\n",
193 (unsigned long) mh.msg_controllen, (unsigned) size);
194 puts("+++ exited with 0 +++");
195
196 return 0;
197 }
198