1 /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 /*
19 Testing of some network related lookup functions.
20 The system databases looked up are:
21 - /etc/services
22 - /etc/hosts
23 - /etc/networks
24 - /etc/protocols
25 The tests try to be fairly generic and simple so that they work on
26 every possible setup (and might therefore not detect some possible
27 errors).
28 */
29
30 #include <netdb.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <arpa/inet.h>
35 #include <netinet/in.h>
36 #include <sys/param.h>
37 #include <sys/socket.h>
38 #include <unistd.h>
39 #include <errno.h>
40 #include "nss.h"
41
42 #include <support/support.h>
43
44 /*
45 The following define is necessary for glibc 2.0.6
46 */
47 #ifndef INET6_ADDRSTRLEN
48 # define INET6_ADDRSTRLEN 46
49 #endif
50
51 int error_count;
52
53 static void
54 output_servent (const char *call, struct servent *sptr)
55 {
56 char **pptr;
57
58 if (sptr == NULL)
59 printf ("Call: %s returned NULL\n", call);
60 else
61 {
62 printf ("Call: %s, returned: s_name: %s, s_port: %d, s_proto: %s\n",
63 call, sptr->s_name, ntohs(sptr->s_port), sptr->s_proto);
64 for (pptr = sptr->s_aliases; *pptr != NULL; pptr++)
65 printf (" alias: %s\n", *pptr);
66 }
67 }
68
69
70 static void
71 test_services (void)
72 {
73 struct servent *sptr;
74
75 sptr = getservbyname ("domain", "tcp");
76 output_servent ("getservbyname (\"domain\", \"tcp\")", sptr);
77
78 sptr = getservbyname ("domain", "udp");
79 output_servent ("getservbyname (\"domain\", \"udp\")", sptr);
80
81 sptr = getservbyname ("domain", NULL);
82 output_servent ("getservbyname (\"domain\", NULL)", sptr);
83
84 sptr = getservbyname ("not-existant", NULL);
85 output_servent ("getservbyname (\"not-existant\", NULL)", sptr);
86
87 /* This shouldn't return anything. */
88 sptr = getservbyname ("", "");
89 output_servent ("getservbyname (\"\", \"\")", sptr);
90
91 sptr = getservbyname ("", "tcp");
92 output_servent ("getservbyname (\"\", \"tcp\")", sptr);
93
94 sptr = getservbyport (htons(53), "tcp");
95 output_servent ("getservbyport (htons(53), \"tcp\")", sptr);
96
97 sptr = getservbyport (htons(53), NULL);
98 output_servent ("getservbyport (htons(53), NULL)", sptr);
99
100 sptr = getservbyport (htons(1), "udp"); /* shouldn't exist */
101 output_servent ("getservbyport (htons(1), \"udp\")", sptr);
102
103 setservent (0);
104 do
105 {
106 sptr = getservent ();
107 output_servent ("getservent ()", sptr);
108 }
109 while (sptr != NULL);
110 endservent ();
111 }
112
113
114 static void
115 output_hostent (const char *call, struct hostent *hptr)
116 {
117 char **pptr;
118 char buf[INET6_ADDRSTRLEN];
119
120 if (hptr == NULL)
121 printf ("Call: %s returned NULL\n", call);
122 else
123 {
124 printf ("Call: %s returned: name: %s, addr_type: %d\n",
125 call, hptr->h_name, hptr->h_addrtype);
126 if (hptr->h_aliases)
127 for (pptr = hptr->h_aliases; *pptr != NULL; pptr++)
128 printf (" alias: %s\n", *pptr);
129
130 for (pptr = hptr->h_addr_list; *pptr != NULL; pptr++)
131 printf (" ip: %s\n",
132 inet_ntop (hptr->h_addrtype, *pptr, buf, sizeof (buf)));
133 }
134 }
135
136 static void
137 test_hosts (void)
138 {
139 struct hostent *hptr1, *hptr2;
140 char *name = NULL;
141 size_t namelen = 0;
142 struct in_addr ip;
143
144 hptr1 = gethostbyname ("localhost");
145 hptr2 = gethostbyname ("LocalHost");
146 if (hptr1 != NULL || hptr2 != NULL)
147 {
148 if (hptr1 == NULL)
149 {
150 printf ("localhost not found - but LocalHost found:-(\n");
151 ++error_count;
152 }
153 else if (hptr2 == NULL)
154 {
155 printf ("LocalHost not found - but localhost found:-(\n");
156 ++error_count;
157 }
158 else if (strcmp (hptr1->h_name, hptr2->h_name) != 0)
159 {
160 printf ("localhost and LocalHost have different canonical name\n");
161 printf ("gethostbyname (\"localhost\")->%s\n", hptr1->h_name);
162 printf ("gethostbyname (\"LocalHost\")->%s\n", hptr2->h_name);
163 ++error_count;
164 }
165 else
166 output_hostent ("gethostbyname(\"localhost\")", hptr1);
167 }
168
169 hptr1 = gethostbyname ("127.0.0.1");
170 output_hostent ("gethostbyname (\"127.0.0.1\")", hptr1);
171
172 hptr1 = gethostbyname ("10.1234");
173 output_hostent ("gethostbyname (\"10.1234\")", hptr1);
174
175 hptr1 = gethostbyname2 ("localhost", AF_INET);
176 output_hostent ("gethostbyname2 (\"localhost\", AF_INET)", hptr1);
177
178 while (gethostname (name, namelen) < 0 && errno == ENAMETOOLONG)
179 {
180 namelen += 2; /* tiny increments to test a lot */
181 name = xrealloc (name, namelen);
182 }
183 if (gethostname (name, namelen) == 0)
184 {
185 printf ("Hostname: %s\n", name);
186 if (name != NULL)
187 {
188 hptr1 = gethostbyname (name);
189 output_hostent ("gethostbyname (gethostname(...))", hptr1);
190 }
191 }
192
193 ip.s_addr = htonl (INADDR_LOOPBACK);
194 hptr1 = gethostbyaddr ((char *) &ip, sizeof (ip), AF_INET);
195 if (hptr1 != NULL)
196 {
197 printf ("official name of 127.0.0.1: %s\n", hptr1->h_name);
198 }
199
200 sethostent (0);
201 do
202 {
203 hptr1 = gethostent ();
204 output_hostent ("gethostent ()", hptr1);
205 }
206 while (hptr1 != NULL);
207 endhostent ();
208
209 }
210
211
212 static void
213 output_netent (const char *call, struct netent *nptr)
214 {
215 char **pptr;
216
217 if (nptr == NULL)
218 printf ("Call: %s returned NULL\n", call);
219 else
220 {
221 struct in_addr ip;
222
223 ip.s_addr = htonl(nptr->n_net);
224 printf ("Call: %s, returned: n_name: %s, network_number: %s\n",
225 call, nptr->n_name, inet_ntoa (ip));
226
227 for (pptr = nptr->n_aliases; *pptr != NULL; pptr++)
228 printf (" alias: %s\n", *pptr);
229 }
230 }
231
232 static void
233 test_network (void)
234 {
235 struct netent *nptr;
236 uint32_t ip;
237
238 /*
239 This test needs the following line in /etc/networks:
240 loopback 127.0.0.0
241 */
242 nptr = getnetbyname ("loopback");
243 output_netent ("getnetbyname (\"loopback\")",nptr);
244
245 nptr = getnetbyname ("LoopBACK");
246 output_netent ("getnetbyname (\"LoopBACK\")",nptr);
247
248 ip = inet_network ("127.0.0.0");
249 nptr = getnetbyaddr (ip, AF_INET);
250 output_netent ("getnetbyaddr (inet_network (\"127.0.0.0\"), AF_INET)",nptr);
251
252 setnetent (0);
253 do
254 {
255 nptr = getnetent ();
256 output_netent ("getnetent ()", nptr);
257 }
258 while (nptr != NULL);
259 endnetent ();
260 }
261
262
263 static void
264 output_protoent (const char *call, struct protoent *prptr)
265 {
266 char **pptr;
267
268 if (prptr == NULL)
269 printf ("Call: %s returned NULL\n", call);
270 else
271 {
272 printf ("Call: %s, returned: p_name: %s, p_proto: %d\n",
273 call, prptr->p_name, prptr->p_proto);
274 for (pptr = prptr->p_aliases; *pptr != NULL; pptr++)
275 printf (" alias: %s\n", *pptr);
276 }
277 }
278
279
280 static void
281 test_protocols (void)
282 {
283 struct protoent *prptr;
284
285 prptr = getprotobyname ("IP");
286 output_protoent ("getprotobyname (\"IP\")", prptr);
287
288 prptr = getprotobynumber (1);
289 output_protoent ("getprotobynumber (1)", prptr);
290
291 setprotoent (0);
292 do
293 {
294 prptr = getprotoent ();
295 output_protoent ("getprotoent ()", prptr);
296 }
297 while (prptr != NULL);
298 endprotoent ();
299 }
300
301
302 /* Override /etc/nsswitch.conf for this program. This is mainly
303 useful for developers. */
304 static void __attribute__ ((unused))
305 setdb (const char *dbname)
306 {
307 if (strcmp ("db", dbname))
308 {
309 /*
310 db is not implemented for hosts, networks
311 */
312 __nss_configure_lookup ("hosts", dbname);
313 __nss_configure_lookup ("networks", dbname);
314 }
315 __nss_configure_lookup ("protocols", dbname);
316 __nss_configure_lookup ("services", dbname);
317 }
318
319
320 static int
321 do_test (void)
322 {
323 /*
324 setdb ("db");
325 */
326
327 test_hosts ();
328 test_network ();
329 test_protocols ();
330 test_services ();
331
332 if (error_count)
333 printf ("\n %d errors occurred!\n", error_count);
334 else
335 printf ("No visible errors occurred!\n");
336
337 return (error_count != 0);
338 }
339
340 #include <support/test-driver.c>