1 /*
2 * Check decoding of SIOCGIFCONF command of ioctl syscall.
3 *
4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
5 * Copyright (c) 2016-2017 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
33 #include <stdbool.h>
34 #include <stdio.h>
35 #include <string.h>
36
37 #include <arpa/inet.h>
38 #include <net/if.h>
39 #include <sys/ioctl.h>
40 #include <sys/socket.h>
41
42 #define MAX_STRLEN 1
43
44 static void
print_ifc_len(int val)45 print_ifc_len(int val)
46 {
47 if (val % (int) sizeof(struct ifreq))
48 printf("%d", val);
49 else
50 printf("%d * sizeof(struct ifreq)",
51 val / (int) sizeof(struct ifreq));
52 }
53
54 static void
print_ifconf(struct ifconf * ifc,int in_len,char * in_buf,long rc)55 print_ifconf(struct ifconf *ifc, int in_len, char *in_buf, long rc)
56 {
57 if (in_buf) {
58 printf("{ifc_len=");
59 print_ifc_len(in_len);
60
61 if (in_len != ifc->ifc_len) {
62 printf(" => ");
63 print_ifc_len(ifc->ifc_len);
64 }
65 } else {
66 printf("{ifc_len=");
67 print_ifc_len(ifc->ifc_len);
68 }
69
70 printf(", ifc_buf=");
71
72 if ((rc < 0) || !in_buf) {
73 if (in_buf)
74 printf("%p", in_buf);
75 else
76 printf("NULL");
77 } else {
78 int i;
79
80 printf("[");
81 for (i = 0; i < (ifc->ifc_len) &&
82 i < (int) (MAX_STRLEN * sizeof(struct ifreq));
83 i += sizeof(struct ifreq)) {
84 struct ifreq *ifr = (struct ifreq *) (ifc->ifc_buf + i);
85 struct sockaddr_in *const sa_in =
86 (struct sockaddr_in *) &(ifr->ifr_addr);
87
88 if (i)
89 printf(", ");
90 printf("{ifr_name=\"%s\", ifr_addr={sa_family=AF_INET, "
91 "sin_port=htons(%u), sin_addr=inet_addr(\"%s\")}"
92 "}", ifr->ifr_name, ntohs(sa_in->sin_port),
93 inet_ntoa(sa_in->sin_addr));
94 }
95
96 if ((size_t) (ifc->ifc_len - i) >= sizeof(struct ifreq))
97 printf(", ...");
98
99 printf("]");
100 }
101
102 printf("}");
103 }
104
105 static void
gifconf_ioctl(int fd,struct ifconf * ifc,bool ifc_valid)106 gifconf_ioctl(int fd, struct ifconf *ifc, bool ifc_valid)
107 {
108 const char *errstr;
109 int in_len;
110 char *in_buf;
111 long rc;
112
113 if (ifc_valid) {
114 in_len = ifc->ifc_len;
115 in_buf = ifc->ifc_buf;
116 }
117
118 rc = ioctl(fd, SIOCGIFCONF, ifc);
119 errstr = sprintrc(rc);
120
121 printf("ioctl(%d, SIOCGIFCONF, ", fd);
122 if (ifc_valid) {
123 print_ifconf(ifc, in_len, in_buf, rc);
124 } else {
125 if (ifc)
126 printf("%p", ifc);
127 else
128 printf("NULL");
129 }
130
131 printf(") = %s\n", errstr);
132 }
133
134 int
main(int argc,char * argv[])135 main(int argc, char *argv[])
136 {
137 struct ifreq *ifr = tail_alloc(2 * sizeof(*ifr));
138 TAIL_ALLOC_OBJECT_CONST_PTR(struct ifconf, ifc);
139
140 struct sockaddr_in addr;
141 int fd;
142
143 memset(&addr, 0, sizeof(addr));
144 addr.sin_family = AF_INET;
145 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
146
147 if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
148 perror_msg_and_skip("socket AF_INET");
149
150 gifconf_ioctl(fd, NULL, false);
151 gifconf_ioctl(fd, ifc + 1, false);
152
153 ifc->ifc_len = 3141592653U;
154 ifc->ifc_buf = NULL;
155 gifconf_ioctl(fd, ifc, true);
156
157 ifc->ifc_len = 0;
158 ifc->ifc_buf = (char *) (ifr + 2);
159 gifconf_ioctl(fd, ifc, true);
160
161 ifc->ifc_len = 1;
162 ifc->ifc_buf = (char *) (ifr + 1);
163 gifconf_ioctl(fd, ifc, true);
164
165 ifc->ifc_len = 1 * sizeof(*ifr);
166 ifc->ifc_buf = (char *) (ifr + 1);
167 gifconf_ioctl(fd, ifc, true);
168
169 ifc->ifc_len = 2 * sizeof(*ifr);
170 ifc->ifc_buf = (char *) (ifr + 1);
171 gifconf_ioctl(fd, ifc, true);
172
173 ifc->ifc_len = 2 * sizeof(*ifr) + 2;
174 ifc->ifc_buf = (char *) ifr;
175 gifconf_ioctl(fd, ifc, true);
176
177 ifc->ifc_len = 3 * sizeof(*ifr) + 4;
178 ifc->ifc_buf = (char *) ifr;
179 gifconf_ioctl(fd, ifc, true);
180
181 puts("+++ exited with 0 +++");
182 return 0;
183 }
184