1 | /* Test _nss_dns_getcanonname_r corner cases. |
2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <dlfcn.h> |
20 | #include <errno.h> |
21 | #include <gnu/lib-names.h> |
22 | #include <netdb.h> |
23 | #include <nss.h> |
24 | #include <stdio.h> |
25 | #include <stdlib.h> |
26 | #include <string.h> |
27 | #include <support/check.h> |
28 | #include <support/resolv_test.h> |
29 | #include <support/support.h> |
30 | |
31 | /* _nss_dns_getcanonname_r is not called during regular operation |
32 | because nss_dns directly provides a canonical name, so we have to |
33 | test it directly. The function pointer is initialized by do_test |
34 | below. */ |
35 | static enum nss_status |
36 | (*getcanonname) (const char *name, char *buffer, size_t buflen, |
37 | char **result, int *errnop, int *h_errnop); |
38 | |
39 | static void |
40 | response (const struct resolv_response_context *ctx, |
41 | struct resolv_response_builder *b, |
42 | const char *qname, uint16_t qclass, uint16_t qtype) |
43 | { |
44 | int code; |
45 | { |
46 | char *tail; |
47 | if (sscanf (s: qname, format: "code%d.%ms" , &code, &tail) != 2 |
48 | || strcmp (s1: tail, s2: "example" ) != 0) |
49 | FAIL_EXIT1 ("error: invalid QNAME: %s\n" , qname); |
50 | free (ptr: tail); |
51 | } |
52 | |
53 | switch (code) |
54 | { |
55 | case 1: |
56 | resolv_response_init (b, (struct resolv_response_flags) {}); |
57 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
58 | resolv_response_section (b, ns_s_an); |
59 | resolv_response_open_record (b, name: "www.example" , class: qclass, type: qtype, ttl: 0); |
60 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
61 | resolv_response_close_record (b); |
62 | break; |
63 | case 2: |
64 | resolv_response_init (b, (struct resolv_response_flags) {}); |
65 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
66 | resolv_response_section (b, ns_s_an); |
67 | if (qtype == T_AAAA) |
68 | { |
69 | resolv_response_open_record (b, name: "www.example" , class: qclass, type: qtype, ttl: 0); |
70 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
71 | resolv_response_close_record (b); |
72 | for (int i = 0; i < 30000; ++i) |
73 | resolv_response_add_data (b, "" , 1); |
74 | } |
75 | break; |
76 | case 3: |
77 | resolv_response_init (b, (struct resolv_response_flags) {}); |
78 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
79 | resolv_response_section (b, ns_s_an); |
80 | if (qtype == T_AAAA) |
81 | { |
82 | resolv_response_open_record (b, name: "www.example" , class: qclass, type: qtype, ttl: 0); |
83 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
84 | resolv_response_close_record (b); |
85 | } |
86 | else |
87 | { |
88 | for (int i = 0; i < 30000; ++i) |
89 | resolv_response_add_data (b, "" , 1); |
90 | } |
91 | break; |
92 | case 4: |
93 | resolv_response_init (b, (struct resolv_response_flags) {}); |
94 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
95 | resolv_response_section (b, ns_s_an); |
96 | resolv_response_open_record (b, name: qname, class: qclass, T_CNAME, ttl: 0); |
97 | resolv_response_add_name (b, name: "www.example" ); |
98 | resolv_response_close_record (b); |
99 | resolv_response_open_record (b, name: "www.example" , class: qclass, type: qtype, ttl: 0); |
100 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
101 | resolv_response_close_record (b); |
102 | break; |
103 | case 5: |
104 | resolv_response_init (b, (struct resolv_response_flags) {}); |
105 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
106 | resolv_response_section (b, ns_s_an); |
107 | resolv_response_open_record (b, name: qname, class: qclass, T_CNAME, ttl: 0); |
108 | resolv_response_add_name (b, name: "www.example" ); |
109 | resolv_response_close_record (b); |
110 | resolv_response_open_record (b, name: qname, class: qclass, T_CNAME, ttl: 0); |
111 | resolv_response_add_name (b, name: "www1.example" ); |
112 | resolv_response_close_record (b); |
113 | resolv_response_open_record (b, name: "www1.example" , class: qclass, type: qtype, ttl: 0); |
114 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
115 | resolv_response_close_record (b); |
116 | break; |
117 | case 6: |
118 | resolv_response_init (b, (struct resolv_response_flags) {}); |
119 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
120 | resolv_response_section (b, ns_s_an); |
121 | resolv_response_open_record (b, name: qname, class: qclass, T_CNAME, ttl: 0); |
122 | resolv_response_add_name (b, name: "www.example" ); |
123 | resolv_response_close_record (b); |
124 | resolv_response_open_record (b, name: qname, class: qclass, type: 46 /* RRSIG */, ttl: 0); |
125 | resolv_response_add_name (b, name: "." ); |
126 | resolv_response_close_record (b); |
127 | resolv_response_open_record (b, name: "www.example" , class: qclass, type: qtype, ttl: 0); |
128 | resolv_response_add_data (b, "\xC0\x00\x02\x01" , 4); |
129 | resolv_response_close_record (b); |
130 | break; |
131 | case 102: |
132 | if (!ctx->tcp) |
133 | { |
134 | resolv_response_init (b, (struct resolv_response_flags) {.tc = true}); |
135 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
136 | } |
137 | else |
138 | { |
139 | resolv_response_init |
140 | (b, (struct resolv_response_flags) {.ancount = 1}); |
141 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
142 | resolv_response_section (b, ns_s_an); |
143 | resolv_response_open_record (b, name: qname, class: qclass, T_CNAME, ttl: 0); |
144 | size_t to_fill = 65535 - resolv_response_length (b) |
145 | - 2 /* length, "n" */ - 2 /* compression reference */ |
146 | - 2 /* RR type */; |
147 | for (size_t i = 0; i < to_fill; ++i) |
148 | resolv_response_add_data (b, "" , 1); |
149 | resolv_response_close_record (b); |
150 | resolv_response_add_name (b, name: "n.example" ); |
151 | uint16_t rrtype = htons (T_CNAME); |
152 | resolv_response_add_data (b, &rrtype, sizeof (rrtype)); |
153 | } |
154 | break; |
155 | case 103: |
156 | /* NODATA repsonse. */ |
157 | resolv_response_init (b, (struct resolv_response_flags) {}); |
158 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
159 | break; |
160 | case 104: |
161 | resolv_response_init (b, (struct resolv_response_flags) {.ancount = 1}); |
162 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
163 | /* No RR metadata. */ |
164 | resolv_response_add_name (b, name: "www.example" ); |
165 | break; |
166 | case 105: |
167 | if (qtype == T_A) |
168 | { |
169 | resolv_response_init (b, (struct resolv_response_flags) {}); |
170 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
171 | /* No data, trigger AAAA query. */ |
172 | } |
173 | else |
174 | { |
175 | resolv_response_init |
176 | (b, (struct resolv_response_flags) {.ancount = 1}); |
177 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
178 | /* No RR metadata. */ |
179 | resolv_response_add_name |
180 | (b, name: "long-name-exceed-previously-initialized-buffer.example" ); |
181 | } |
182 | break; |
183 | case 106: |
184 | resolv_response_init (b, (struct resolv_response_flags) {.ancount = 1}); |
185 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
186 | /* No RR metadata. */ |
187 | resolv_response_add_name (b, name: "www.example" ); |
188 | resolv_response_add_data (b, "\xff\xff" , 2); |
189 | break; |
190 | case 107: |
191 | if (qtype == T_A) |
192 | { |
193 | resolv_response_init (b, (struct resolv_response_flags) {}); |
194 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
195 | /* No data, trigger AAAA query. */ |
196 | } |
197 | else |
198 | { |
199 | resolv_response_init |
200 | (b, (struct resolv_response_flags) {.ancount = 1}); |
201 | resolv_response_add_question (b, name: qname, class: qclass, type: qtype); |
202 | /* No RR metadata. */ |
203 | resolv_response_add_name (b, name: "www.example" ); |
204 | resolv_response_add_data (b, "\xff\xff" , 2); |
205 | } |
206 | break; |
207 | default: |
208 | FAIL_EXIT1 ("error: invalid QNAME: %s (code %d)\n" , qname, code); |
209 | } |
210 | } |
211 | |
212 | static void |
213 | check (int code, const char *expected) |
214 | { |
215 | char qname[200]; |
216 | snprintf (s: qname, maxlen: sizeof (qname), format: "code%d.example" , code); |
217 | char *result; |
218 | enum nss_status status; |
219 | { |
220 | enum { buffer_size = 4096 }; |
221 | char *buffer = xmalloc (n: buffer_size); |
222 | char *temp_result; |
223 | int temp_errno; |
224 | int temp_herrno; |
225 | status = getcanonname |
226 | (qname, buffer, buffer_size, &temp_result, &temp_errno, &temp_herrno); |
227 | if (status == NSS_STATUS_SUCCESS) |
228 | result = xstrdup (temp_result); |
229 | else |
230 | { |
231 | errno = temp_errno; |
232 | h_errno = temp_herrno; |
233 | } |
234 | free (ptr: buffer); |
235 | } |
236 | |
237 | if (status == NSS_STATUS_SUCCESS) |
238 | { |
239 | if (expected != NULL) |
240 | { |
241 | if (strcmp (s1: result, s2: expected) != 0) |
242 | { |
243 | support_record_failure (); |
244 | printf (format: "error: getcanonname (%s) failed\n" , qname); |
245 | printf (format: "error: expected: %s\n" , expected); |
246 | printf (format: "error: actual: %s\n" , result); |
247 | free (ptr: result); |
248 | return; |
249 | } |
250 | } |
251 | else |
252 | { |
253 | support_record_failure (); |
254 | printf (format: "error: getcanonname (%s) unexpected success\n" , qname); |
255 | printf (format: "error: actual: %s\n" , result); |
256 | free (ptr: result); |
257 | return; |
258 | } |
259 | free (ptr: result); |
260 | } |
261 | else |
262 | { |
263 | if (expected != NULL) |
264 | { |
265 | support_record_failure (); |
266 | printf (format: "error: getcanonname (%s) failed\n" , qname); |
267 | printf (format: "error: expected: %s\n" , expected); |
268 | return; |
269 | } |
270 | } |
271 | } |
272 | |
273 | |
274 | static int |
275 | do_test (void) |
276 | { |
277 | void *nss_dns_handle = dlopen (LIBNSS_DNS_SO, RTLD_LAZY); |
278 | if (nss_dns_handle == NULL) |
279 | FAIL_EXIT1 ("could not dlopen %s: %s" , LIBNSS_DNS_SO, dlerror ()); |
280 | { |
281 | const char *func = "_nss_dns_getcanonname_r" ; |
282 | void *ptr = dlsym (handle: nss_dns_handle, name: func); |
283 | if (ptr == NULL) |
284 | FAIL_EXIT1 ("could not look up %s: %s" , func, dlerror ()); |
285 | getcanonname = ptr; |
286 | } |
287 | |
288 | struct resolv_test *aux = resolv_test_start |
289 | ((struct resolv_redirect_config) |
290 | { |
291 | .response_callback = response, |
292 | }); |
293 | |
294 | check (code: 1, expected: "www.example" ); |
295 | check (code: 2, expected: "www.example" ); |
296 | check (code: 3, expected: "www.example" ); |
297 | check (code: 4, expected: "www.example" ); |
298 | check (code: 5, expected: "www1.example" ); |
299 | |
300 | /* This should really result in "www.example", but the fake RRSIG |
301 | record causes the current implementation to stop parsing. */ |
302 | check (code: 6, NULL); |
303 | |
304 | for (int i = 102; i <= 107; ++i) |
305 | check (code: i, NULL); |
306 | |
307 | resolv_test_end (aux); |
308 | |
309 | TEST_VERIFY (dlclose (nss_dns_handle) == 0); |
310 | return 0; |
311 | } |
312 | |
313 | #include <support/test-driver.c> |
314 | |