about summary refs log tree commit diff
path: root/nss/tst-nss-files-hosts-getent.c
blob: dfa6e8d57f69393f10af96ce39b9973992b60b77 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/* Enumerate /etc/hosts with a long line (bug 18991).
   Copyright (C) 2018-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */


#include <dlfcn.h>
#include <errno.h>
#include <gnu/lib-names.h>
#include <netdb.h>
#include <nss.h>
#include <stdlib.h>
#include <stdio.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/namespace.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/xmemstream.h>
#include <support/xstdio.h>
#include <support/xunistd.h>

struct support_chroot *chroot_env;

/* Number of alias names in the long line.  This is varied to catch
   different cases where the ERANGE handling can go wrong (line buffer
   length, alias buffer).  */
static int name_count;

/* Write /etc/hosts, from outside of the chroot.  */
static void
write_hosts (void)
{
  FILE *fp = xfopen (chroot_env->path_hosts, "w");
  fputs ("127.0.0.1   localhost localhost.localdomain\n", fp);
  fputs ("192.0.2.2 host2.example.com\n", fp);
  fputs ("192.0.2.1", fp);
  for (int i = 0; i < name_count; ++i)
    fprintf (fp, " host%d.example.com", i);
  fputs ("\n192.0.2.80 www.example.com\n"
         "192.0.2.5 host5.example.com\n"
         "192.0.2.81 www1.example.com\n", fp);
  xfclose (fp);
}

const char *host1_expected =
  "name: localhost\n"
  "alias: localhost.localdomain\n"
  "address: 127.0.0.1\n";
const char *host2_expected =
  "name: host2.example.com\n"
  "address: 192.0.2.2\n";
const char *host4_expected =
  "name: www.example.com\n"
  "address: 192.0.2.80\n";
const char *host5_expected =
  "name: host5.example.com\n"
  "address: 192.0.2.5\n";
const char *host6_expected =
  "name: www1.example.com\n"
  "address: 192.0.2.81\n";

static void
prepare (int argc, char **argv)
{
  chroot_env = support_chroot_create
    ((struct support_chroot_configuration)
     {
       .resolv_conf = "",
       .hosts = "",             /* Filled in by write_hosts.  */
       .host_conf = "multi on\n",
     });
}

/* If -1, no sethostent call.  Otherwise, pass do_stayopen as the
   sethostent argument.  */
static int do_stayopen;

/* If non-zero, perform an endostent call.  */
static int do_endent;

static void
subprocess_getent (void *closure)
{
  xchroot (chroot_env->path_chroot);

  errno = 0;
  if (do_stayopen >= 0)
    sethostent (do_stayopen);
  TEST_VERIFY (errno == 0);

  int i = 0;
  while (true)
    {
      struct xmemstream expected;
      xopen_memstream (&expected);
      switch (++i)
        {
        case 1:
          fputs (host1_expected, expected.out);
          break;
        case 2:
          fputs (host2_expected, expected.out);
          break;
        case 3:
          fputs ("name: host0.example.com\n", expected.out);
          for (int j = 1; j < name_count; ++j)
            fprintf (expected.out, "alias: host%d.example.com\n", j);
          fputs ("address: 192.0.2.1\n", expected.out);
          break;
        case 4:
          fputs (host4_expected, expected.out);
          break;
        case 5:
          fputs (host5_expected, expected.out);
          break;
        case 6:
          fputs (host6_expected, expected.out);
          break;
        default:
          fprintf (expected.out, "*** unexpected host %d ***\n", i);
          break;
        }
      xfclose_memstream (&expected);
      char *context = xasprintf ("do_stayopen=%d host=%d", do_stayopen, i);

      errno = 0;
      struct hostent *e = gethostent ();
      if (e == NULL)
        {
          TEST_VERIFY (errno == 0);
          break;
        }
      check_hostent (context, e, expected.buffer);
      free (context);
      free (expected.buffer);
    }

  errno = 0;
  if (do_endent)
    endhostent ();
  TEST_VERIFY (errno == 0);

  /* Exercise process termination.   */
  exit (0);
}

/* getaddrinfo test.  To be run from a subprocess.  */
static void
test_gai (int family)
{
  struct addrinfo hints =
    {
      .ai_family = family,
      .ai_protocol = IPPROTO_TCP,
      .ai_socktype = SOCK_STREAM,
    };

  struct addrinfo *ai;
  int ret = getaddrinfo ("host2.example.com", "80", &hints, &ai);
  check_addrinfo ("host2.example.com", ai, ret,
                  "address: STREAM/TCP 192.0.2.2 80\n"
                  "address: STREAM/TCP 192.0.2.1 80\n");

  ret = getaddrinfo ("host5.example.com", "80", &hints, &ai);
  check_addrinfo ("host5.example.com", ai, ret,
                  "address: STREAM/TCP 192.0.2.1 80\n"
                  "address: STREAM/TCP 192.0.2.5 80\n");

  ret = getaddrinfo ("www.example.com", "80", &hints, &ai);
  check_addrinfo ("www.example.com", ai, ret,
                  "address: STREAM/TCP 192.0.2.80 80\n");

  ret = getaddrinfo ("www1.example.com", "80", &hints, &ai);
  check_addrinfo ("www1.example.com", ai, ret,
                  "address: STREAM/TCP 192.0.2.81 80\n");
}

/* Subprocess routine for gethostbyname/getaddrinfo testing.  */
static void
subprocess_gethost (void *closure)
{
  xchroot (chroot_env->path_chroot);

  /* This tests enlarging the read buffer in the multi case.  */
  struct xmemstream expected;
  xopen_memstream (&expected);
  fputs ("name: host2.example.com\n", expected.out);
  for (int j = 1; j < name_count; ++j)
    /* NB: host2 is duplicated in the alias list.  */
    fprintf (expected.out, "alias: host%d.example.com\n", j);
  fputs ("alias: host0.example.com\n"
         "address: 192.0.2.2\n"
         "address: 192.0.2.1\n",
         expected.out);
  xfclose_memstream (&expected);
  check_hostent ("host2.example.com",
                 gethostbyname ("host2.example.com"),
                 expected.buffer);
  free (expected.buffer);

  /* Similarly, but with a different order in the /etc/hosts file.  */
  xopen_memstream (&expected);
  fputs ("name: host0.example.com\n", expected.out);
  for (int j = 1; j < name_count; ++j)
    fprintf (expected.out, "alias: host%d.example.com\n", j);
  /* NB: host5 is duplicated in the alias list.  */
  fputs ("alias: host5.example.com\n"
         "address: 192.0.2.1\n"
         "address: 192.0.2.5\n",
         expected.out);
  xfclose_memstream (&expected);
  check_hostent ("host5.example.com",
                 gethostbyname ("host5.example.com"),
                 expected.buffer);
  free (expected.buffer);

  check_hostent ("www.example.com",
                 gethostbyname ("www.example.com"),
                 host4_expected);
  check_hostent ("www1.example.com",
                 gethostbyname ("www1.example.com"),
                 host6_expected);

  test_gai (AF_INET);
  test_gai (AF_UNSPEC);
}

static int
do_test (void)
{
  support_become_root ();
  if (!support_can_chroot ())
    return EXIT_UNSUPPORTED;

  __nss_configure_lookup ("hosts", "files");
  if (dlopen (LIBNSS_FILES_SO, RTLD_LAZY) == NULL)
    FAIL_EXIT1 ("could not load " LIBNSS_DNS_SO ": %s", dlerror ());

  /* Each name takes about 20 bytes, so this covers a wide range of
     buffer sizes, from less than 1000 bytes to about 18000 bytes.  */
  for (name_count = 40; name_count <= 850; ++name_count)
    {
      write_hosts ();

      for (do_stayopen = -1; do_stayopen < 2; ++do_stayopen)
        for (do_endent = 0; do_endent < 2; ++do_endent)
          {
            if (test_verbose > 0)
              printf ("info: name_count=%d do_stayopen=%d do_endent=%d\n",
                      name_count, do_stayopen, do_endent);
            support_isolate_in_subprocess (subprocess_getent, NULL);
          }

      support_isolate_in_subprocess (subprocess_gethost, NULL);
    }

  support_chroot_free (chroot_env);
  return 0;
}

#define PREPARE prepare
#include <support/test-driver.c>