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3bdf9aae | 1 | /* $NetBSD: getaddrinfo.c,v 1.91.6.1 2009/01/26 00:27:34 snj Exp $ */\r |
2 | /* $KAME: getaddrinfo.c,v 1.29 2000/08/31 17:26:57 itojun Exp $ */\r | |
3 | \r | |
4 | /*\r | |
5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.\r | |
6 | * All rights reserved.\r | |
7 | *\r | |
8 | * Redistribution and use in source and binary forms, with or without\r | |
9 | * modification, are permitted provided that the following conditions\r | |
10 | * are met:\r | |
11 | * 1. Redistributions of source code must retain the above copyright\r | |
12 | * notice, this list of conditions and the following disclaimer.\r | |
13 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
14 | * notice, this list of conditions and the following disclaimer in the\r | |
15 | * documentation and/or other materials provided with the distribution.\r | |
16 | * 3. Neither the name of the project nor the names of its contributors\r | |
17 | * may be used to endorse or promote products derived from this software\r | |
18 | * without specific prior written permission.\r | |
19 | *\r | |
20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND\r | |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE\r | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
30 | * SUCH DAMAGE.\r | |
31 | */\r | |
32 | \r | |
33 | /*\r | |
34 | * Issues to be discussed:\r | |
35 | * - Return values. There are nonstandard return values defined and used\r | |
36 | * in the source code. This is because RFC2553 is silent about which error\r | |
37 | * code must be returned for which situation.\r | |
38 | * - IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2\r | |
39 | * says to use inet_aton() to convert IPv4 numeric to binary (alows\r | |
40 | * classful form as a result).\r | |
41 | * current code - disallow classful form for IPv4 (due to use of inet_pton).\r | |
42 | * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is\r | |
43 | * invalid.\r | |
44 | * current code - SEGV on freeaddrinfo(NULL)\r | |
45 | * Note:\r | |
46 | * - The code filters out AFs that are not supported by the kernel,\r | |
47 | * when globbing NULL hostname (to loopback, or wildcard). Is it the right\r | |
48 | * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG\r | |
49 | * in ai_flags?\r | |
50 | * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.\r | |
51 | * (1) what should we do against numeric hostname (2) what should we do\r | |
52 | * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?\r | |
53 | * non-loopback address configured? global address configured?\r | |
54 | */\r | |
55 | \r | |
56 | #include <sys/cdefs.h>\r | |
57 | #if defined(LIBC_SCCS) && !defined(lint)\r | |
58 | __RCSID("$NetBSD: getaddrinfo.c,v 1.91.6.1 2009/01/26 00:27:34 snj Exp $");\r | |
59 | #endif /* LIBC_SCCS and not lint */\r | |
60 | \r | |
61 | #define INET6 1\r | |
62 | \r | |
63 | #include "namespace.h"\r | |
64 | #include <sys/types.h>\r | |
65 | #include <sys/param.h>\r | |
66 | #include <sys/socket.h>\r | |
67 | #include <net/if.h>\r | |
68 | #include <netinet/in.h>\r | |
69 | #include <arpa/inet.h>\r | |
70 | #include <arpa/nameser.h>\r | |
71 | #include <assert.h>\r | |
72 | #include <ctype.h>\r | |
73 | #include <errno.h>\r | |
74 | #include <netdb.h>\r | |
75 | #include <resolv.h>\r | |
76 | #include <stddef.h>\r | |
77 | #include <stdio.h>\r | |
78 | #include <stdlib.h>\r | |
79 | #include <string.h>\r | |
80 | #include <unistd.h>\r | |
81 | \r | |
82 | #include <stdarg.h>\r | |
83 | #include <nsswitch.h>\r | |
84 | #include <resolv.h>\r | |
85 | \r | |
86 | //#ifdef YP\r | |
87 | //#include <rpc/rpc.h>\r | |
88 | //#include <rpcsvc/yp_prot.h>\r | |
89 | //#include <rpcsvc/ypclnt.h>\r | |
90 | //#endif\r | |
91 | \r | |
92 | #include <net/servent.h>\r | |
93 | \r | |
94 | #define endservent_r(svd) endservent()\r | |
3bdf9aae | 95 | #define res_nmkquery(state,op,dname,class,type,data,datalen,newrr_in,buf,buflen) res_mkquery( op, dname, class, type, data, datalen, newrr_in, buf, buflen )\r |
96 | #define res_nsend(state,buf,buflen,ans,anssiz) res_send ( buf, buflen, ans, anssiz )\r | |
97 | \r | |
98 | /* Things involving an internal (static) resolver context. */\r | |
99 | __BEGIN_DECLS\r | |
100 | #define __res_get_state() (( 0 != _res.nscount ) ? &_res : NULL )\r | |
101 | #define __res_put_state(state)\r | |
102 | #define __res_state() _res\r | |
103 | __END_DECLS\r | |
104 | \r | |
105 | #ifdef __weak_alias\r | |
106 | __weak_alias(getaddrinfo,_getaddrinfo)\r | |
107 | __weak_alias(freeaddrinfo,_freeaddrinfo)\r | |
108 | __weak_alias(gai_strerror,_gai_strerror)\r | |
109 | #endif\r | |
110 | \r | |
111 | #define SUCCESS 0\r | |
112 | #define ANY 0\r | |
113 | #define YES 1\r | |
114 | #define NO 0\r | |
115 | \r | |
116 | static const char in_addrany[] = { 0, 0, 0, 0 };\r | |
117 | static const char in_loopback[] = { 127, 0, 0, 1 };\r | |
118 | #ifdef INET6\r | |
119 | static const char in6_addrany[] = {\r | |
120 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0\r | |
121 | };\r | |
122 | static const char in6_loopback[] = {\r | |
123 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1\r | |
124 | };\r | |
125 | #endif\r | |
126 | \r | |
127 | static const struct afd {\r | |
128 | int a_af;\r | |
129 | int a_addrlen;\r | |
130 | int a_socklen;\r | |
131 | int a_off;\r | |
132 | const char *a_addrany;\r | |
133 | const char *a_loopback; \r | |
134 | int a_scoped;\r | |
135 | } afdl [] = {\r | |
136 | #ifdef INET6\r | |
137 | {PF_INET6, sizeof(struct in6_addr),\r | |
138 | sizeof(struct sockaddr_in6),\r | |
139 | offsetof(struct sockaddr_in6, sin6_addr),\r | |
140 | in6_addrany, in6_loopback, 1},\r | |
141 | #endif\r | |
142 | {PF_INET, sizeof(struct in_addr),\r | |
143 | sizeof(struct sockaddr_in),\r | |
144 | offsetof(struct sockaddr_in, sin_addr),\r | |
145 | in_addrany, in_loopback, 0},\r | |
146 | {0, 0, 0, 0, NULL, NULL, 0},\r | |
147 | };\r | |
148 | \r | |
149 | struct explore {\r | |
150 | int e_af;\r | |
151 | int e_socktype;\r | |
152 | int e_protocol;\r | |
153 | const char *e_protostr;\r | |
154 | int e_wild;\r | |
155 | #define WILD_AF(ex) ((ex)->e_wild & 0x01)\r | |
156 | #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)\r | |
157 | #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)\r | |
158 | };\r | |
159 | \r | |
160 | static const struct explore explore[] = {\r | |
161 | #if 0\r | |
162 | { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },\r | |
163 | #endif\r | |
164 | #ifdef INET6\r | |
165 | { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },\r | |
166 | { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },\r | |
167 | { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },\r | |
168 | #endif\r | |
169 | { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },\r | |
170 | { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },\r | |
171 | { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },\r | |
172 | { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },\r | |
173 | { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },\r | |
174 | { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },\r | |
175 | { -1, 0, 0, NULL, 0 },\r | |
176 | };\r | |
177 | \r | |
178 | #ifdef INET6\r | |
179 | #define PTON_MAX 16\r | |
180 | #else\r | |
181 | #define PTON_MAX 4\r | |
182 | #endif\r | |
183 | \r | |
184 | static const ns_src default_dns_files[] = {\r | |
185 | { NSSRC_FILES, NS_SUCCESS },\r | |
186 | { NSSRC_DNS, NS_SUCCESS },\r | |
187 | { 0, 0 }\r | |
188 | };\r | |
189 | \r | |
190 | #define MAXPACKET (64*1024)\r | |
191 | \r | |
192 | typedef union {\r | |
193 | HEADER hdr;\r | |
194 | u_char buf[MAXPACKET];\r | |
195 | } querybuf;\r | |
196 | \r | |
197 | struct res_target {\r | |
198 | struct res_target *next;\r | |
199 | const char *name; /* domain name */\r | |
200 | int qclass, qtype; /* class and type of query */\r | |
201 | u_char *answer; /* buffer to put answer */\r | |
202 | int anslen; /* size of answer buffer */\r | |
203 | int n; /* result length */\r | |
204 | };\r | |
205 | \r | |
206 | static int str2number(const char *);\r | |
207 | static int explore_fqdn(const struct addrinfo *, const char *,\r | |
208 | const char *, struct addrinfo **, struct servent_data *);\r | |
209 | static int explore_null(const struct addrinfo *,\r | |
210 | const char *, struct addrinfo **, struct servent_data *);\r | |
211 | static int explore_numeric(const struct addrinfo *, const char *,\r | |
212 | const char *, struct addrinfo **, const char *, struct servent_data *);\r | |
213 | static int explore_numeric_scope(const struct addrinfo *, const char *,\r | |
214 | const char *, struct addrinfo **, struct servent_data *);\r | |
215 | static int get_canonname(const struct addrinfo *,\r | |
216 | struct addrinfo *, const char *);\r | |
217 | static struct addrinfo *get_ai(const struct addrinfo *,\r | |
218 | const struct afd *, const char *);\r | |
219 | static int get_portmatch(const struct addrinfo *, const char *,\r | |
220 | struct servent_data *);\r | |
221 | static int get_port(const struct addrinfo *, const char *, int,\r | |
222 | struct servent_data *);\r | |
223 | static const struct afd *find_afd(int);\r | |
224 | #ifdef INET6\r | |
225 | static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);\r | |
226 | #endif\r | |
227 | \r | |
228 | static struct addrinfo *getanswer(const querybuf *, int, const char *, int,\r | |
229 | const struct addrinfo *);\r | |
230 | static void aisort(struct addrinfo *s, res_state res);\r | |
231 | static int _dns_getaddrinfo(void *, void *, va_list);\r | |
232 | static void _sethtent(FILE **);\r | |
233 | static void _endhtent(FILE **);\r | |
234 | static struct addrinfo *_gethtent(FILE **, const char *,\r | |
235 | const struct addrinfo *);\r | |
236 | static int _files_getaddrinfo(void *, void *, va_list);\r | |
237 | #ifdef YP\r | |
238 | static struct addrinfo *_yphostent(char *, const struct addrinfo *);\r | |
239 | static int _yp_getaddrinfo(void *, void *, va_list);\r | |
240 | #endif\r | |
241 | \r | |
242 | static int res_queryN(const char *, struct res_target *, res_state);\r | |
243 | static int res_searchN(const char *, struct res_target *, res_state);\r | |
244 | static int res_querydomainN(const char *, const char *,\r | |
245 | struct res_target *, res_state);\r | |
246 | \r | |
247 | static const char * const ai_errlist[] = {\r | |
248 | "Success",\r | |
249 | "Address family for hostname not supported", /* EAI_ADDRFAMILY */\r | |
250 | "Temporary failure in name resolution", /* EAI_AGAIN */\r | |
251 | "Invalid value for ai_flags", /* EAI_BADFLAGS */\r | |
252 | "Non-recoverable failure in name resolution", /* EAI_FAIL */\r | |
253 | "ai_family not supported", /* EAI_FAMILY */\r | |
254 | "Memory allocation failure", /* EAI_MEMORY */\r | |
255 | "No address associated with hostname", /* EAI_NODATA */\r | |
256 | "hostname nor servname provided, or not known", /* EAI_NONAME */\r | |
257 | "servname not supported for ai_socktype", /* EAI_SERVICE */\r | |
258 | "ai_socktype not supported", /* EAI_SOCKTYPE */\r | |
259 | "System error returned in errno", /* EAI_SYSTEM */\r | |
260 | "Invalid value for hints", /* EAI_BADHINTS */\r | |
261 | "Resolved protocol is unknown", /* EAI_PROTOCOL */\r | |
262 | "Argument buffer overflow", /* EAI_OVERFLOW */\r | |
263 | "Unknown error", /* EAI_MAX */\r | |
264 | };\r | |
265 | \r | |
266 | /* XXX macros that make external reference is BAD. */\r | |
267 | \r | |
268 | #define GET_AI(ai, afd, addr) \\r | |
269 | do { \\r | |
270 | /* external reference: pai, error, and label free */ \\r | |
271 | (ai) = get_ai(pai, (afd), (addr)); \\r | |
272 | if ((ai) == NULL) { \\r | |
273 | error = EAI_MEMORY; \\r | |
274 | goto free; \\r | |
275 | } \\r | |
276 | } while (/*CONSTCOND*/0)\r | |
277 | \r | |
278 | #define GET_PORT(ai, serv, svd) \\r | |
279 | do { \\r | |
280 | /* external reference: error and label free */ \\r | |
281 | error = get_port((ai), (serv), 0, (svd)); \\r | |
282 | if (error != 0) \\r | |
283 | goto free; \\r | |
284 | } while (/*CONSTCOND*/0)\r | |
285 | \r | |
286 | #define GET_CANONNAME(ai, str) \\r | |
287 | do { \\r | |
288 | /* external reference: pai, error and label free */ \\r | |
289 | error = get_canonname(pai, (ai), (str)); \\r | |
290 | if (error != 0) \\r | |
291 | goto free; \\r | |
292 | } while (/*CONSTCOND*/0)\r | |
293 | \r | |
294 | #define ERR(err) \\r | |
295 | do { \\r | |
296 | /* external reference: error, and label bad */ \\r | |
297 | error = (err); \\r | |
298 | goto bad; \\r | |
299 | /*NOTREACHED*/ \\r | |
300 | } while (/*CONSTCOND*/0)\r | |
301 | \r | |
302 | #define MATCH_FAMILY(x, y, w) \\r | |
303 | ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || \\r | |
304 | (y) == PF_UNSPEC))) \r | |
305 | #define MATCH(x, y, w) \\r | |
306 | ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))\r | |
307 | \r | |
cb120565 TW |
308 | int nsdispatch(void *result, const ns_dtab dist_tab[], const char* database,\r |
309 | const char *method, const ns_src defaults[], ...)\r | |
310 | {\r | |
311 | return NS_NOTFOUND;\r | |
312 | }\r | |
313 | \r | |
3bdf9aae | 314 | const char *\r |
315 | gai_strerror(int ecode)\r | |
316 | {\r | |
317 | if (ecode < 0 || ecode > EAI_MAX)\r | |
318 | ecode = EAI_MAX;\r | |
319 | return ai_errlist[ecode];\r | |
320 | }\r | |
321 | \r | |
322 | void\r | |
323 | freeaddrinfo(struct addrinfo *ai)\r | |
324 | {\r | |
325 | struct addrinfo *next;\r | |
326 | \r | |
327 | _DIAGASSERT(ai != NULL);\r | |
328 | \r | |
329 | do {\r | |
330 | next = ai->ai_next;\r | |
331 | if (ai->ai_canonname)\r | |
332 | free(ai->ai_canonname);\r | |
333 | /* no need to free(ai->ai_addr) */\r | |
334 | free(ai);\r | |
335 | ai = next;\r | |
336 | } while (ai);\r | |
337 | }\r | |
338 | \r | |
339 | static int\r | |
340 | str2number(const char *p)\r | |
341 | {\r | |
342 | char *ep;\r | |
343 | unsigned long v;\r | |
344 | \r | |
345 | _DIAGASSERT(p != NULL);\r | |
346 | \r | |
347 | if (*p == '\0')\r | |
348 | return -1;\r | |
349 | ep = NULL;\r | |
350 | errno = 0;\r | |
351 | v = strtoul(p, &ep, 10);\r | |
352 | if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX)\r | |
353 | return v;\r | |
354 | else\r | |
355 | return -1;\r | |
356 | }\r | |
357 | \r | |
358 | int\r | |
359 | getaddrinfo(const char *hostname, const char *servname,\r | |
360 | const struct addrinfo *hints, struct addrinfo **res)\r | |
361 | {\r | |
362 | struct addrinfo sentinel;\r | |
363 | struct addrinfo *cur;\r | |
364 | int error = 0;\r | |
365 | struct addrinfo ai;\r | |
366 | struct addrinfo ai0;\r | |
367 | struct addrinfo *pai;\r | |
368 | const struct explore *ex;\r | |
369 | struct servent_data svd;\r | |
370 | \r | |
371 | /* hostname is allowed to be NULL */\r | |
372 | /* servname is allowed to be NULL */\r | |
373 | /* hints is allowed to be NULL */\r | |
374 | _DIAGASSERT(res != NULL);\r | |
375 | \r | |
376 | (void)memset(&svd, 0, sizeof(svd));\r | |
377 | memset(&sentinel, 0, sizeof(sentinel));\r | |
378 | cur = &sentinel;\r | |
379 | memset(&ai, 0, sizeof(ai));\r | |
380 | pai = &ai;\r | |
381 | pai->ai_flags = 0;\r | |
382 | pai->ai_family = PF_UNSPEC;\r | |
383 | pai->ai_socktype = ANY;\r | |
384 | pai->ai_protocol = ANY;\r | |
385 | pai->ai_addrlen = 0;\r | |
386 | pai->ai_canonname = NULL;\r | |
387 | pai->ai_addr = NULL;\r | |
388 | pai->ai_next = NULL;\r | |
389 | \r | |
390 | if (hostname == NULL && servname == NULL)\r | |
391 | return EAI_NONAME;\r | |
392 | if (hints) {\r | |
393 | /* error check for hints */\r | |
394 | if (hints->ai_addrlen || hints->ai_canonname ||\r | |
395 | hints->ai_addr || hints->ai_next)\r | |
396 | ERR(EAI_BADHINTS); /* xxx */\r | |
397 | if (hints->ai_flags & ~AI_MASK)\r | |
398 | ERR(EAI_BADFLAGS);\r | |
399 | switch (hints->ai_family) {\r | |
400 | case PF_UNSPEC:\r | |
401 | case PF_INET:\r | |
402 | #ifdef INET6\r | |
403 | case PF_INET6:\r | |
404 | #endif\r | |
405 | break;\r | |
406 | default:\r | |
407 | ERR(EAI_FAMILY);\r | |
408 | }\r | |
409 | memcpy(pai, hints, sizeof(*pai));\r | |
410 | \r | |
411 | /*\r | |
412 | * if both socktype/protocol are specified, check if they\r | |
413 | * are meaningful combination.\r | |
414 | */\r | |
415 | if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {\r | |
416 | for (ex = explore; ex->e_af >= 0; ex++) {\r | |
417 | if (pai->ai_family != ex->e_af)\r | |
418 | continue;\r | |
419 | if (ex->e_socktype == ANY)\r | |
420 | continue;\r | |
421 | if (ex->e_protocol == ANY)\r | |
422 | continue;\r | |
423 | if (pai->ai_socktype == ex->e_socktype\r | |
424 | && pai->ai_protocol != ex->e_protocol) {\r | |
425 | ERR(EAI_BADHINTS);\r | |
426 | }\r | |
427 | }\r | |
428 | }\r | |
429 | }\r | |
430 | \r | |
431 | /*\r | |
432 | * check for special cases. (1) numeric servname is disallowed if\r | |
433 | * socktype/protocol are left unspecified. (2) servname is disallowed\r | |
434 | * for raw and other inet{,6} sockets.\r | |
435 | */\r | |
436 | if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)\r | |
437 | #ifdef PF_INET6\r | |
438 | || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)\r | |
439 | #endif\r | |
440 | ) {\r | |
441 | ai0 = *pai; /* backup *pai */\r | |
442 | \r | |
443 | if (pai->ai_family == PF_UNSPEC) {\r | |
444 | #ifdef PF_INET6\r | |
445 | pai->ai_family = PF_INET6;\r | |
446 | #else\r | |
447 | pai->ai_family = PF_INET;\r | |
448 | #endif\r | |
449 | }\r | |
450 | error = get_portmatch(pai, servname, &svd);\r | |
451 | if (error)\r | |
452 | ERR(error);\r | |
453 | \r | |
454 | *pai = ai0;\r | |
455 | }\r | |
456 | \r | |
457 | ai0 = *pai;\r | |
458 | \r | |
459 | /* NULL hostname, or numeric hostname */\r | |
460 | for (ex = explore; ex->e_af >= 0; ex++) {\r | |
461 | *pai = ai0;\r | |
462 | \r | |
463 | /* PF_UNSPEC entries are prepared for DNS queries only */\r | |
464 | if (ex->e_af == PF_UNSPEC)\r | |
465 | continue;\r | |
466 | \r | |
467 | if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))\r | |
468 | continue;\r | |
469 | if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))\r | |
470 | continue;\r | |
471 | if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))\r | |
472 | continue;\r | |
473 | \r | |
474 | if (pai->ai_family == PF_UNSPEC)\r | |
475 | pai->ai_family = ex->e_af;\r | |
476 | if (pai->ai_socktype == ANY && ex->e_socktype != ANY)\r | |
477 | pai->ai_socktype = ex->e_socktype;\r | |
478 | if (pai->ai_protocol == ANY && ex->e_protocol != ANY)\r | |
479 | pai->ai_protocol = ex->e_protocol;\r | |
480 | \r | |
481 | if (hostname == NULL)\r | |
482 | error = explore_null(pai, servname, &cur->ai_next,\r | |
483 | &svd);\r | |
484 | else\r | |
485 | error = explore_numeric_scope(pai, hostname, servname,\r | |
486 | &cur->ai_next, &svd);\r | |
487 | \r | |
488 | if (error)\r | |
489 | goto free;\r | |
490 | \r | |
491 | while (cur->ai_next)\r | |
492 | cur = cur->ai_next;\r | |
493 | }\r | |
494 | \r | |
495 | /*\r | |
496 | * XXX\r | |
497 | * If numeric representation of AF1 can be interpreted as FQDN\r | |
498 | * representation of AF2, we need to think again about the code below.\r | |
499 | */\r | |
500 | if (sentinel.ai_next)\r | |
501 | goto good;\r | |
502 | \r | |
503 | if (hostname == NULL)\r | |
504 | ERR(EAI_NODATA);\r | |
505 | if (pai->ai_flags & AI_NUMERICHOST)\r | |
506 | ERR(EAI_NONAME);\r | |
507 | \r | |
508 | /*\r | |
509 | * hostname as alphabetical name.\r | |
510 | * we would like to prefer AF_INET6 than AF_INET, so we'll make a\r | |
511 | * outer loop by AFs.\r | |
512 | */\r | |
513 | for (ex = explore; ex->e_af >= 0; ex++) {\r | |
514 | *pai = ai0;\r | |
515 | \r | |
516 | /* require exact match for family field */\r | |
517 | if (pai->ai_family != ex->e_af)\r | |
518 | continue;\r | |
519 | \r | |
520 | if (!MATCH(pai->ai_socktype, ex->e_socktype,\r | |
521 | WILD_SOCKTYPE(ex))) {\r | |
522 | continue;\r | |
523 | }\r | |
524 | if (!MATCH(pai->ai_protocol, ex->e_protocol,\r | |
525 | WILD_PROTOCOL(ex))) {\r | |
526 | continue;\r | |
527 | }\r | |
528 | \r | |
529 | if (pai->ai_socktype == ANY && ex->e_socktype != ANY)\r | |
530 | pai->ai_socktype = ex->e_socktype;\r | |
531 | if (pai->ai_protocol == ANY && ex->e_protocol != ANY)\r | |
532 | pai->ai_protocol = ex->e_protocol;\r | |
533 | \r | |
534 | error = explore_fqdn(pai, hostname, servname, &cur->ai_next,\r | |
535 | &svd);\r | |
536 | \r | |
537 | while (cur && cur->ai_next)\r | |
538 | cur = cur->ai_next;\r | |
539 | }\r | |
540 | \r | |
541 | /* XXX */\r | |
542 | if (sentinel.ai_next)\r | |
543 | error = 0;\r | |
544 | \r | |
545 | if (error)\r | |
546 | goto free;\r | |
547 | \r | |
548 | if (sentinel.ai_next) {\r | |
549 | good:\r | |
550 | endservent_r(&svd);\r | |
551 | *res = sentinel.ai_next;\r | |
552 | return SUCCESS;\r | |
553 | } else\r | |
554 | error = EAI_FAIL;\r | |
555 | free:\r | |
556 | bad:\r | |
557 | endservent_r(&svd);\r | |
558 | if (sentinel.ai_next)\r | |
559 | freeaddrinfo(sentinel.ai_next);\r | |
560 | *res = NULL;\r | |
561 | return error;\r | |
562 | }\r | |
563 | \r | |
826f9005 | 564 | static const ns_dtab dtab[] = {\r |
7700f0f5 | 565 | NS_FILES_CB(((nss_method)_files_getaddrinfo), NULL)\r |
566 | { NSSRC_DNS, ((nss_method)_dns_getaddrinfo), NULL }, /* force -DHESIOD */\r | |
826f9005 | 567 | NS_NIS_CB(_yp_getaddrinfo, NULL)\r |
568 | NS_NULL_CB\r | |
569 | };\r | |
570 | \r | |
3bdf9aae | 571 | /*\r |
572 | * FQDN hostname, DNS lookup\r | |
573 | */\r | |
574 | static int\r | |
575 | explore_fqdn(const struct addrinfo *pai, const char *hostname,\r | |
576 | const char *servname, struct addrinfo **res, struct servent_data *svd)\r | |
577 | {\r | |
578 | struct addrinfo *result;\r | |
579 | struct addrinfo *cur;\r | |
580 | int error = 0;\r | |
3bdf9aae | 581 | \r |
582 | _DIAGASSERT(pai != NULL);\r | |
583 | /* hostname may be NULL */\r | |
584 | /* servname may be NULL */\r | |
585 | _DIAGASSERT(res != NULL);\r | |
586 | \r | |
587 | result = NULL;\r | |
588 | \r | |
589 | /*\r | |
590 | * if the servname does not match socktype/protocol, ignore it.\r | |
591 | */\r | |
592 | if (get_portmatch(pai, servname, svd) != 0)\r | |
593 | return 0;\r | |
594 | \r | |
595 | switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",\r | |
596 | default_dns_files, hostname, pai)) {\r | |
597 | case NS_TRYAGAIN:\r | |
598 | error = EAI_AGAIN;\r | |
599 | goto free;\r | |
600 | case NS_UNAVAIL:\r | |
601 | error = EAI_FAIL;\r | |
602 | goto free;\r | |
603 | case NS_NOTFOUND:\r | |
604 | error = EAI_NODATA;\r | |
605 | goto free;\r | |
606 | case NS_SUCCESS:\r | |
607 | error = 0;\r | |
608 | for (cur = result; cur; cur = cur->ai_next) {\r | |
609 | GET_PORT(cur, servname, svd);\r | |
610 | /* canonname should be filled already */\r | |
611 | }\r | |
612 | break;\r | |
613 | }\r | |
614 | \r | |
615 | *res = result;\r | |
616 | \r | |
617 | return 0;\r | |
618 | \r | |
619 | free:\r | |
620 | if (result)\r | |
621 | freeaddrinfo(result);\r | |
622 | return error;\r | |
623 | }\r | |
624 | \r | |
625 | /*\r | |
626 | * hostname == NULL.\r | |
627 | * passive socket -> anyaddr (0.0.0.0 or ::)\r | |
628 | * non-passive socket -> localhost (127.0.0.1 or ::1)\r | |
629 | */\r | |
630 | static int\r | |
631 | explore_null(const struct addrinfo *pai, const char *servname,\r | |
632 | struct addrinfo **res, struct servent_data *svd)\r | |
633 | {\r | |
634 | int s;\r | |
635 | const struct afd *afd;\r | |
636 | struct addrinfo *cur;\r | |
637 | struct addrinfo sentinel;\r | |
638 | int error;\r | |
639 | \r | |
640 | _DIAGASSERT(pai != NULL);\r | |
641 | /* servname may be NULL */\r | |
642 | _DIAGASSERT(res != NULL);\r | |
643 | \r | |
644 | *res = NULL;\r | |
645 | sentinel.ai_next = NULL;\r | |
646 | cur = &sentinel;\r | |
647 | \r | |
648 | /*\r | |
649 | * filter out AFs that are not supported by the kernel\r | |
650 | * XXX errno?\r | |
651 | */\r | |
652 | s = socket(pai->ai_family, SOCK_DGRAM, 0);\r | |
653 | if (s < 0) {\r | |
654 | if (errno != EMFILE)\r | |
655 | return 0;\r | |
656 | } else\r | |
657 | close(s);\r | |
658 | \r | |
659 | /*\r | |
660 | * if the servname does not match socktype/protocol, ignore it.\r | |
661 | */\r | |
662 | if (get_portmatch(pai, servname, svd) != 0)\r | |
663 | return 0;\r | |
664 | \r | |
665 | afd = find_afd(pai->ai_family);\r | |
666 | if (afd == NULL)\r | |
667 | return 0;\r | |
668 | \r | |
669 | if (pai->ai_flags & AI_PASSIVE) {\r | |
670 | GET_AI(cur->ai_next, afd, afd->a_addrany);\r | |
671 | /* xxx meaningless?\r | |
672 | * GET_CANONNAME(cur->ai_next, "anyaddr");\r | |
673 | */\r | |
674 | GET_PORT(cur->ai_next, servname, svd);\r | |
675 | } else {\r | |
676 | GET_AI(cur->ai_next, afd, afd->a_loopback);\r | |
677 | /* xxx meaningless?\r | |
678 | * GET_CANONNAME(cur->ai_next, "localhost");\r | |
679 | */\r | |
680 | GET_PORT(cur->ai_next, servname, svd);\r | |
681 | }\r | |
682 | cur = cur->ai_next;\r | |
683 | \r | |
684 | *res = sentinel.ai_next;\r | |
685 | return 0;\r | |
686 | \r | |
687 | free:\r | |
688 | if (sentinel.ai_next)\r | |
689 | freeaddrinfo(sentinel.ai_next);\r | |
690 | return error;\r | |
691 | }\r | |
692 | \r | |
693 | /*\r | |
694 | * numeric hostname\r | |
695 | */\r | |
696 | static int\r | |
697 | explore_numeric(const struct addrinfo *pai, const char *hostname,\r | |
698 | const char *servname, struct addrinfo **res, const char *canonname,\r | |
699 | struct servent_data *svd)\r | |
700 | {\r | |
701 | const struct afd *afd;\r | |
702 | struct addrinfo *cur;\r | |
703 | struct addrinfo sentinel;\r | |
704 | int error;\r | |
705 | char pton[PTON_MAX];\r | |
706 | \r | |
707 | _DIAGASSERT(pai != NULL);\r | |
708 | /* hostname may be NULL */\r | |
709 | /* servname may be NULL */\r | |
710 | _DIAGASSERT(res != NULL);\r | |
711 | \r | |
712 | *res = NULL;\r | |
713 | sentinel.ai_next = NULL;\r | |
714 | cur = &sentinel;\r | |
715 | \r | |
716 | /*\r | |
717 | * if the servname does not match socktype/protocol, ignore it.\r | |
718 | */\r | |
719 | if (get_portmatch(pai, servname, svd) != 0)\r | |
720 | return 0;\r | |
721 | \r | |
722 | afd = find_afd(pai->ai_family);\r | |
723 | if (afd == NULL)\r | |
724 | return 0;\r | |
725 | \r | |
726 | switch (afd->a_af) {\r | |
727 | #if 0 /*X/Open spec*/\r | |
728 | case AF_INET:\r | |
729 | if (inet_aton(hostname, (struct in_addr *)pton) == 1) {\r | |
730 | if (pai->ai_family == afd->a_af ||\r | |
731 | pai->ai_family == PF_UNSPEC /*?*/) {\r | |
732 | GET_AI(cur->ai_next, afd, pton);\r | |
733 | GET_PORT(cur->ai_next, servname, svd);\r | |
734 | if ((pai->ai_flags & AI_CANONNAME)) {\r | |
735 | /*\r | |
736 | * Set the numeric address itself as\r | |
737 | * the canonical name, based on a\r | |
738 | * clarification in rfc2553bis-03.\r | |
739 | */\r | |
740 | GET_CANONNAME(cur->ai_next, canonname);\r | |
741 | }\r | |
742 | while (cur && cur->ai_next)\r | |
743 | cur = cur->ai_next;\r | |
744 | } else\r | |
745 | ERR(EAI_FAMILY); /*xxx*/\r | |
746 | }\r | |
747 | break;\r | |
748 | #endif\r | |
749 | default:\r | |
750 | if (inet_pton(afd->a_af, hostname, pton) == 1) {\r | |
751 | if (pai->ai_family == afd->a_af ||\r | |
752 | pai->ai_family == PF_UNSPEC /*?*/) {\r | |
753 | GET_AI(cur->ai_next, afd, pton);\r | |
754 | GET_PORT(cur->ai_next, servname, svd);\r | |
755 | if ((pai->ai_flags & AI_CANONNAME)) {\r | |
756 | /*\r | |
757 | * Set the numeric address itself as\r | |
758 | * the canonical name, based on a\r | |
759 | * clarification in rfc2553bis-03.\r | |
760 | */\r | |
761 | GET_CANONNAME(cur->ai_next, canonname);\r | |
762 | }\r | |
763 | while (cur->ai_next)\r | |
764 | cur = cur->ai_next;\r | |
765 | } else\r | |
766 | ERR(EAI_FAMILY); /*xxx*/\r | |
767 | }\r | |
768 | break;\r | |
769 | }\r | |
770 | \r | |
771 | *res = sentinel.ai_next;\r | |
772 | return 0;\r | |
773 | \r | |
774 | free:\r | |
775 | bad:\r | |
776 | if (sentinel.ai_next)\r | |
777 | freeaddrinfo(sentinel.ai_next);\r | |
778 | return error;\r | |
779 | }\r | |
780 | \r | |
781 | /*\r | |
782 | * numeric hostname with scope\r | |
783 | */\r | |
784 | static int\r | |
785 | explore_numeric_scope(const struct addrinfo *pai, const char *hostname,\r | |
786 | const char *servname, struct addrinfo **res, struct servent_data *svd)\r | |
787 | {\r | |
788 | #if !defined(SCOPE_DELIMITER) || !defined(INET6)\r | |
789 | return explore_numeric(pai, hostname, servname, res, hostname, svd);\r | |
790 | #else\r | |
791 | const struct afd *afd;\r | |
792 | struct addrinfo *cur;\r | |
793 | int error;\r | |
794 | char *cp, *hostname2 = NULL, *scope, *addr;\r | |
795 | struct sockaddr_in6 *sin6;\r | |
796 | \r | |
797 | _DIAGASSERT(pai != NULL);\r | |
798 | /* hostname may be NULL */\r | |
799 | /* servname may be NULL */\r | |
800 | _DIAGASSERT(res != NULL);\r | |
801 | \r | |
802 | /*\r | |
803 | * if the servname does not match socktype/protocol, ignore it.\r | |
804 | */\r | |
805 | if (get_portmatch(pai, servname, svd) != 0)\r | |
806 | return 0;\r | |
807 | \r | |
808 | afd = find_afd(pai->ai_family);\r | |
809 | if (afd == NULL)\r | |
810 | return 0;\r | |
811 | \r | |
812 | if (!afd->a_scoped)\r | |
813 | return explore_numeric(pai, hostname, servname, res, hostname,\r | |
814 | svd);\r | |
815 | \r | |
816 | cp = strchr(hostname, SCOPE_DELIMITER);\r | |
817 | if (cp == NULL)\r | |
818 | return explore_numeric(pai, hostname, servname, res, hostname,\r | |
819 | svd);\r | |
820 | \r | |
821 | /*\r | |
822 | * Handle special case of <scoped_address><delimiter><scope id>\r | |
823 | */\r | |
824 | hostname2 = strdup(hostname);\r | |
825 | if (hostname2 == NULL)\r | |
826 | return EAI_MEMORY;\r | |
827 | /* terminate at the delimiter */\r | |
828 | hostname2[cp - hostname] = '\0';\r | |
829 | addr = hostname2;\r | |
830 | scope = cp + 1;\r | |
831 | \r | |
832 | error = explore_numeric(pai, addr, servname, res, hostname, svd);\r | |
833 | if (error == 0) {\r | |
834 | u_int32_t scopeid;\r | |
835 | \r | |
836 | for (cur = *res; cur; cur = cur->ai_next) {\r | |
837 | if (cur->ai_family != AF_INET6)\r | |
838 | continue;\r | |
839 | sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;\r | |
840 | if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {\r | |
841 | free(hostname2);\r | |
842 | return(EAI_NODATA); /* XXX: is return OK? */\r | |
843 | }\r | |
844 | sin6->sin6_scope_id = scopeid;\r | |
845 | }\r | |
846 | }\r | |
847 | \r | |
848 | free(hostname2);\r | |
849 | \r | |
850 | return error;\r | |
851 | #endif\r | |
852 | }\r | |
853 | \r | |
854 | static int\r | |
855 | get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)\r | |
856 | {\r | |
857 | \r | |
858 | _DIAGASSERT(pai != NULL);\r | |
859 | _DIAGASSERT(ai != NULL);\r | |
860 | _DIAGASSERT(str != NULL);\r | |
861 | \r | |
862 | if ((pai->ai_flags & AI_CANONNAME) != 0) {\r | |
863 | ai->ai_canonname = strdup(str);\r | |
864 | if (ai->ai_canonname == NULL)\r | |
865 | return EAI_MEMORY;\r | |
866 | }\r | |
867 | return 0;\r | |
868 | }\r | |
869 | \r | |
870 | static struct addrinfo *\r | |
871 | get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)\r | |
872 | {\r | |
873 | char *p;\r | |
874 | struct addrinfo *ai;\r | |
875 | \r | |
876 | _DIAGASSERT(pai != NULL);\r | |
877 | _DIAGASSERT(afd != NULL);\r | |
878 | _DIAGASSERT(addr != NULL);\r | |
879 | \r | |
880 | ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)\r | |
881 | + (afd->a_socklen));\r | |
882 | if (ai == NULL)\r | |
883 | return NULL;\r | |
884 | \r | |
885 | memcpy(ai, pai, sizeof(struct addrinfo));\r | |
886 | ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);\r | |
887 | memset(ai->ai_addr, 0, (size_t)afd->a_socklen);\r | |
888 | ai->ai_addr->sa_len = (uint8_t)afd->a_socklen;\r | |
889 | ai->ai_addrlen = afd->a_socklen;\r | |
890 | ai->ai_family = afd->a_af;\r | |
891 | ai->ai_addr->sa_family = (sa_family_t)ai->ai_family;\r | |
892 | p = (char *)(void *)(ai->ai_addr);\r | |
893 | memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);\r | |
894 | return ai;\r | |
895 | }\r | |
896 | \r | |
897 | static int\r | |
898 | get_portmatch(const struct addrinfo *ai, const char *servname,\r | |
899 | struct servent_data *svd)\r | |
900 | {\r | |
901 | \r | |
902 | _DIAGASSERT(ai != NULL);\r | |
903 | /* servname may be NULL */\r | |
904 | \r | |
905 | return get_port(ai, servname, 1, svd);\r | |
906 | }\r | |
907 | \r | |
908 | static int\r | |
909 | get_port(const struct addrinfo *ai, const char *servname, int matchonly,\r | |
910 | struct servent_data *svd)\r | |
911 | {\r | |
912 | const char *proto;\r | |
913 | struct servent *sp;\r | |
914 | int port;\r | |
915 | int allownumeric;\r | |
916 | \r | |
917 | _DIAGASSERT(ai != NULL);\r | |
918 | /* servname may be NULL */\r | |
919 | \r | |
920 | if (servname == NULL)\r | |
921 | return 0;\r | |
922 | switch (ai->ai_family) {\r | |
923 | case AF_INET:\r | |
924 | #ifdef AF_INET6\r | |
925 | case AF_INET6:\r | |
926 | #endif\r | |
927 | break;\r | |
928 | default:\r | |
929 | return 0;\r | |
930 | }\r | |
931 | \r | |
932 | switch (ai->ai_socktype) {\r | |
933 | case SOCK_RAW:\r | |
934 | return EAI_SERVICE;\r | |
935 | case SOCK_DGRAM:\r | |
936 | case SOCK_STREAM:\r | |
937 | allownumeric = 1;\r | |
938 | break;\r | |
939 | case ANY:\r | |
940 | /*\r | |
941 | * This was 0. It is now 1 so that queries specifying\r | |
942 | * a NULL hint, or hint without socktype (but, hopefully,\r | |
943 | * with protocol) and numeric address actually work.\r | |
944 | */\r | |
945 | allownumeric = 1;\r | |
946 | break;\r | |
947 | default:\r | |
948 | return EAI_SOCKTYPE;\r | |
949 | }\r | |
950 | \r | |
951 | port = str2number(servname);\r | |
952 | if (port >= 0) {\r | |
953 | if (!allownumeric)\r | |
954 | return EAI_SERVICE;\r | |
955 | if (port < 0 || port > 65535)\r | |
956 | return EAI_SERVICE;\r | |
957 | port = htons(port);\r | |
958 | } else {\r | |
959 | // struct servent sv;\r | |
960 | if (ai->ai_flags & AI_NUMERICSERV)\r | |
961 | return EAI_NONAME;\r | |
962 | \r | |
963 | switch (ai->ai_socktype) {\r | |
964 | case SOCK_DGRAM:\r | |
965 | proto = "udp";\r | |
966 | break;\r | |
967 | case SOCK_STREAM:\r | |
968 | proto = "tcp";\r | |
969 | break;\r | |
970 | default:\r | |
971 | proto = NULL;\r | |
972 | break;\r | |
973 | }\r | |
974 | \r | |
975 | // sp = getservbyname_r(servname, proto, &sv, svd);\r | |
976 | sp = getservbyname ( servname, proto );\r | |
977 | if (sp == NULL)\r | |
978 | return EAI_SERVICE;\r | |
979 | port = sp->s_port;\r | |
980 | }\r | |
981 | \r | |
982 | if (!matchonly) {\r | |
983 | switch (ai->ai_family) {\r | |
984 | case AF_INET:\r | |
985 | ((struct sockaddr_in *)(void *)\r | |
986 | ai->ai_addr)->sin_port = (in_port_t)port;\r | |
987 | break;\r | |
988 | #ifdef INET6\r | |
989 | case AF_INET6:\r | |
990 | ((struct sockaddr_in6 *)(void *)\r | |
991 | ai->ai_addr)->sin6_port = (in_port_t)port;\r | |
992 | break;\r | |
993 | #endif\r | |
994 | }\r | |
995 | }\r | |
996 | \r | |
997 | return 0;\r | |
998 | }\r | |
999 | \r | |
1000 | static const struct afd *\r | |
1001 | find_afd(int af)\r | |
1002 | {\r | |
1003 | const struct afd *afd;\r | |
1004 | \r | |
1005 | if (af == PF_UNSPEC)\r | |
1006 | return NULL;\r | |
1007 | for (afd = afdl; afd->a_af; afd++) {\r | |
1008 | if (afd->a_af == af)\r | |
1009 | return afd;\r | |
1010 | }\r | |
1011 | return NULL;\r | |
1012 | }\r | |
1013 | \r | |
1014 | #ifdef INET6\r | |
1015 | /* convert a string to a scope identifier. XXX: IPv6 specific */\r | |
1016 | static int\r | |
1017 | ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)\r | |
1018 | {\r | |
1019 | u_long lscopeid;\r | |
1020 | struct in6_addr *a6;\r | |
1021 | char *ep;\r | |
1022 | \r | |
1023 | _DIAGASSERT(scope != NULL);\r | |
1024 | _DIAGASSERT(sin6 != NULL);\r | |
1025 | _DIAGASSERT(scopeid != NULL);\r | |
1026 | \r | |
1027 | a6 = &sin6->sin6_addr;\r | |
1028 | \r | |
1029 | /* empty scopeid portion is invalid */\r | |
1030 | if (*scope == '\0')\r | |
1031 | return -1;\r | |
1032 | \r | |
1033 | if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {\r | |
1034 | /*\r | |
1035 | * We currently assume a one-to-one mapping between links\r | |
1036 | * and interfaces, so we simply use interface indices for\r | |
1037 | * like-local scopes.\r | |
1038 | */\r | |
1039 | /*\r | |
1040 | *scopeid = if_nametoindex(scope);\r | |
1041 | if (*scopeid == 0)\r | |
1042 | goto trynumeric;\r | |
1043 | return 0;\r | |
1044 | */\r | |
1045 | return -1;\r | |
1046 | }\r | |
1047 | \r | |
1048 | /* still unclear about literal, allow numeric only - placeholder */\r | |
1049 | if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))\r | |
1050 | goto trynumeric;\r | |
1051 | if (IN6_IS_ADDR_MC_ORGLOCAL(a6))\r | |
1052 | goto trynumeric;\r | |
1053 | else\r | |
1054 | goto trynumeric; /* global */\r | |
1055 | \r | |
1056 | /* try to convert to a numeric id as a last resort */\r | |
1057 | trynumeric:\r | |
1058 | errno = 0;\r | |
1059 | lscopeid = strtoul(scope, &ep, 10);\r | |
1060 | *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);\r | |
1061 | if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)\r | |
1062 | return 0;\r | |
1063 | else\r | |
1064 | return -1;\r | |
1065 | }\r | |
1066 | #endif\r | |
1067 | \r | |
1068 | /* code duplicate with gethnamaddr.c */\r | |
1069 | \r | |
3bdf9aae | 1070 | static struct addrinfo *\r |
1071 | getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,\r | |
1072 | const struct addrinfo *pai)\r | |
1073 | {\r | |
1074 | struct addrinfo sentinel, *cur;\r | |
1075 | struct addrinfo ai;\r | |
1076 | const struct afd *afd;\r | |
1077 | char *canonname;\r | |
1078 | const HEADER *hp;\r | |
1079 | const u_char *cp;\r | |
1080 | int n;\r | |
1081 | const u_char *eom;\r | |
1082 | char *bp, *ep;\r | |
1083 | int type, class, ancount, qdcount;\r | |
1084 | int haveanswer, had_error;\r | |
1085 | char tbuf[MAXDNAME];\r | |
1086 | int (*name_ok) (const char *);\r | |
1087 | static char hostbuf[8*1024];\r | |
1088 | \r | |
1089 | _DIAGASSERT(answer != NULL);\r | |
1090 | _DIAGASSERT(qname != NULL);\r | |
1091 | _DIAGASSERT(pai != NULL);\r | |
1092 | \r | |
1093 | memset(&sentinel, 0, sizeof(sentinel));\r | |
1094 | cur = &sentinel;\r | |
1095 | \r | |
1096 | canonname = NULL;\r | |
1097 | eom = answer->buf + anslen;\r | |
1098 | switch (qtype) {\r | |
1099 | case T_A:\r | |
1100 | case T_AAAA:\r | |
1101 | case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/\r | |
1102 | name_ok = res_hnok;\r | |
1103 | break;\r | |
1104 | default:\r | |
1105 | return NULL; /* XXX should be abort(); */\r | |
1106 | }\r | |
1107 | /*\r | |
1108 | * find first satisfactory answer\r | |
1109 | */\r | |
1110 | hp = &answer->hdr;\r | |
1111 | ancount = ntohs(hp->ancount);\r | |
1112 | qdcount = ntohs(hp->qdcount);\r | |
1113 | bp = hostbuf;\r | |
1114 | ep = hostbuf + sizeof hostbuf;\r | |
1115 | cp = answer->buf + HFIXEDSZ;\r | |
1116 | if (qdcount != 1) {\r | |
1117 | h_errno = NO_RECOVERY;\r | |
1118 | return (NULL);\r | |
1119 | }\r | |
1120 | n = dn_expand(answer->buf, eom, cp, bp, (int)(ep - bp));\r | |
1121 | if ((n < 0) || !(*name_ok)(bp)) {\r | |
1122 | h_errno = NO_RECOVERY;\r | |
1123 | return (NULL);\r | |
1124 | }\r | |
1125 | cp += n + QFIXEDSZ;\r | |
1126 | if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {\r | |
1127 | /* res_send() has already verified that the query name is the\r | |
1128 | * same as the one we sent; this just gets the expanded name\r | |
1129 | * (i.e., with the succeeding search-domain tacked on).\r | |
1130 | */\r | |
1131 | n = (int)strlen(bp) + 1; /* for the \0 */\r | |
1132 | if (n >= MAXHOSTNAMELEN) {\r | |
1133 | h_errno = NO_RECOVERY;\r | |
1134 | return (NULL);\r | |
1135 | }\r | |
1136 | canonname = bp;\r | |
1137 | bp += n;\r | |
1138 | /* The qname can be abbreviated, but h_name is now absolute. */\r | |
1139 | qname = canonname;\r | |
1140 | }\r | |
1141 | haveanswer = 0;\r | |
1142 | had_error = 0;\r | |
1143 | while (ancount-- > 0 && cp < eom && !had_error) {\r | |
1144 | n = dn_expand(answer->buf, eom, cp, bp, (int)(ep - bp));\r | |
1145 | if ((n < 0) || !(*name_ok)(bp)) {\r | |
1146 | had_error++;\r | |
1147 | continue;\r | |
1148 | }\r | |
1149 | cp += n; /* name */\r | |
1150 | type = _getshort(cp);\r | |
1151 | cp += INT16SZ; /* type */\r | |
1152 | class = _getshort(cp);\r | |
1153 | cp += INT16SZ + INT32SZ; /* class, TTL */\r | |
1154 | n = _getshort(cp);\r | |
1155 | cp += INT16SZ; /* len */\r | |
1156 | if (class != C_IN) {\r | |
1157 | /* XXX - debug? syslog? */\r | |
1158 | cp += n;\r | |
1159 | continue; /* XXX - had_error++ ? */\r | |
1160 | }\r | |
1161 | if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&\r | |
1162 | type == T_CNAME) {\r | |
1163 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);\r | |
1164 | if ((n < 0) || !(*name_ok)(tbuf)) {\r | |
1165 | had_error++;\r | |
1166 | continue;\r | |
1167 | }\r | |
1168 | cp += n;\r | |
1169 | /* Get canonical name. */\r | |
1170 | n = (int)strlen(tbuf) + 1; /* for the \0 */\r | |
1171 | if (n > ep - bp || n >= MAXHOSTNAMELEN) {\r | |
1172 | had_error++;\r | |
1173 | continue;\r | |
1174 | }\r | |
1175 | strlcpy(bp, tbuf, (size_t)(ep - bp));\r | |
1176 | canonname = bp;\r | |
1177 | bp += n;\r | |
1178 | continue;\r | |
1179 | }\r | |
1180 | if (qtype == T_ANY) {\r | |
1181 | if (!(type == T_A || type == T_AAAA)) {\r | |
1182 | cp += n;\r | |
1183 | continue;\r | |
1184 | }\r | |
1185 | } else if (type != qtype) {\r | |
1186 | if (type != T_KEY && type != T_SIG) {\r | |
1187 | #ifdef _ORG_FREEBSD_\r | |
1188 | struct syslog_data sd = SYSLOG_DATA_INIT;\r | |
1189 | syslog_r(LOG_NOTICE|LOG_AUTH, &sd,\r | |
1190 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",\r | |
1191 | qname, p_class(C_IN), p_type(qtype),\r | |
1192 | p_type(type));\r | |
1193 | #endif\r | |
1194 | }\r | |
1195 | cp += n;\r | |
1196 | continue; /* XXX - had_error++ ? */\r | |
1197 | }\r | |
1198 | switch (type) {\r | |
1199 | case T_A:\r | |
1200 | case T_AAAA:\r | |
1201 | if (strcasecmp(canonname, bp) != 0) {\r | |
1202 | #ifdef _ORG_FREEBSD_\r | |
1203 | struct syslog_data sd = SYSLOG_DATA_INIT;\r | |
1204 | syslog_r(LOG_NOTICE|LOG_AUTH, &sd,\r | |
1205 | AskedForGot, canonname, bp);\r | |
1206 | #endif\r | |
1207 | cp += n;\r | |
1208 | continue; /* XXX - had_error++ ? */\r | |
1209 | }\r | |
1210 | if (type == T_A && n != INADDRSZ) {\r | |
1211 | cp += n;\r | |
1212 | continue;\r | |
1213 | }\r | |
1214 | if (type == T_AAAA && n != IN6ADDRSZ) {\r | |
1215 | cp += n;\r | |
1216 | continue;\r | |
1217 | }\r | |
1218 | if (type == T_AAAA) {\r | |
1219 | struct in6_addr in6;\r | |
1220 | memcpy(&in6, cp, IN6ADDRSZ);\r | |
1221 | if (IN6_IS_ADDR_V4MAPPED(&in6)) {\r | |
1222 | cp += n;\r | |
1223 | continue;\r | |
1224 | }\r | |
1225 | }\r | |
1226 | if (!haveanswer) {\r | |
1227 | int nn;\r | |
1228 | \r | |
1229 | canonname = bp;\r | |
1230 | nn = (int)strlen(bp) + 1; /* for the \0 */\r | |
1231 | bp += nn;\r | |
1232 | }\r | |
1233 | \r | |
1234 | /* don't overwrite pai */\r | |
1235 | ai = *pai;\r | |
1236 | ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;\r | |
1237 | afd = find_afd(ai.ai_family);\r | |
1238 | if (afd == NULL) {\r | |
1239 | cp += n;\r | |
1240 | continue;\r | |
1241 | }\r | |
1242 | cur->ai_next = get_ai(&ai, afd, (const char *)cp);\r | |
1243 | if (cur->ai_next == NULL)\r | |
1244 | had_error++;\r | |
1245 | while (cur && cur->ai_next)\r | |
1246 | cur = cur->ai_next;\r | |
1247 | cp += n;\r | |
1248 | break;\r | |
1249 | default:\r | |
1250 | abort();\r | |
1251 | }\r | |
1252 | if (!had_error)\r | |
1253 | haveanswer++;\r | |
1254 | }\r | |
1255 | if (haveanswer) {\r | |
1256 | if (!canonname)\r | |
1257 | (void)get_canonname(pai, sentinel.ai_next, qname);\r | |
1258 | else\r | |
1259 | (void)get_canonname(pai, sentinel.ai_next, canonname);\r | |
1260 | h_errno = NETDB_SUCCESS;\r | |
1261 | return sentinel.ai_next;\r | |
1262 | }\r | |
1263 | \r | |
1264 | h_errno = NO_RECOVERY;\r | |
1265 | return NULL;\r | |
1266 | }\r | |
1267 | \r | |
1268 | #define SORTEDADDR(p) (((struct sockaddr_in *)(void *)(p->ai_next->ai_addr))->sin_addr.s_addr)\r | |
1269 | #define SORTMATCH(p, s) ((SORTEDADDR(p) & (s).mask) == (s).addr.s_addr)\r | |
1270 | \r | |
1271 | static void\r | |
1272 | aisort(struct addrinfo *s, res_state res)\r | |
1273 | {\r | |
1274 | struct addrinfo head, *t, *p;\r | |
1275 | int i;\r | |
1276 | \r | |
1277 | head.ai_next = NULL;\r | |
1278 | t = &head;\r | |
1279 | \r | |
1280 | for (i = 0; i < (int)res->nsort; i++) {\r | |
1281 | p = s;\r | |
1282 | while (p->ai_next) {\r | |
1283 | if ((p->ai_next->ai_family != AF_INET)\r | |
1284 | || SORTMATCH(p, res->sort_list[i])) {\r | |
1285 | t->ai_next = p->ai_next;\r | |
1286 | t = t->ai_next;\r | |
1287 | p->ai_next = p->ai_next->ai_next;\r | |
1288 | } else {\r | |
1289 | p = p->ai_next;\r | |
1290 | }\r | |
1291 | }\r | |
1292 | }\r | |
1293 | \r | |
1294 | /* add rest of list and reset s to the new list*/\r | |
1295 | t->ai_next = s->ai_next;\r | |
1296 | s->ai_next = head.ai_next;\r | |
1297 | }\r | |
1298 | \r | |
1299 | /*ARGSUSED*/\r | |
1300 | static int\r | |
1301 | _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)\r | |
1302 | {\r | |
1303 | struct addrinfo *ai;\r | |
1304 | querybuf *buf, *buf2;\r | |
1305 | const char *name;\r | |
1306 | const struct addrinfo *pai;\r | |
1307 | struct addrinfo sentinel, *cur;\r | |
1308 | struct res_target q, q2;\r | |
1309 | res_state res;\r | |
1310 | \r | |
1311 | name = va_arg(ap, char *);\r | |
1312 | pai = va_arg(ap, const struct addrinfo *);\r | |
1313 | \r | |
1314 | memset(&q, 0, sizeof(q));\r | |
1315 | memset(&q2, 0, sizeof(q2));\r | |
1316 | memset(&sentinel, 0, sizeof(sentinel));\r | |
1317 | cur = &sentinel;\r | |
1318 | \r | |
1319 | buf = malloc(sizeof(*buf));\r | |
1320 | if (buf == NULL) {\r | |
1321 | h_errno = NETDB_INTERNAL;\r | |
1322 | return NS_NOTFOUND;\r | |
1323 | }\r | |
1324 | buf2 = malloc(sizeof(*buf2));\r | |
1325 | if (buf2 == NULL) {\r | |
1326 | free(buf);\r | |
1327 | h_errno = NETDB_INTERNAL;\r | |
1328 | return NS_NOTFOUND;\r | |
1329 | }\r | |
1330 | \r | |
1331 | switch (pai->ai_family) {\r | |
1332 | case AF_UNSPEC:\r | |
1333 | /* prefer IPv6 */\r | |
1334 | q.name = name;\r | |
1335 | q.qclass = C_IN;\r | |
1336 | q.qtype = T_AAAA;\r | |
1337 | q.answer = buf->buf;\r | |
1338 | q.anslen = sizeof(buf->buf);\r | |
1339 | q.next = &q2;\r | |
1340 | q2.name = name;\r | |
1341 | q2.qclass = C_IN;\r | |
1342 | q2.qtype = T_A;\r | |
1343 | q2.answer = buf2->buf;\r | |
1344 | q2.anslen = sizeof(buf2->buf);\r | |
1345 | break;\r | |
1346 | case AF_INET:\r | |
1347 | q.name = name;\r | |
1348 | q.qclass = C_IN;\r | |
1349 | q.qtype = T_A;\r | |
1350 | q.answer = buf->buf;\r | |
1351 | q.anslen = sizeof(buf->buf);\r | |
1352 | break;\r | |
1353 | case AF_INET6:\r | |
1354 | q.name = name;\r | |
1355 | q.qclass = C_IN;\r | |
1356 | q.qtype = T_AAAA;\r | |
1357 | q.answer = buf->buf;\r | |
1358 | q.anslen = sizeof(buf->buf);\r | |
1359 | break;\r | |
1360 | default:\r | |
1361 | free(buf);\r | |
1362 | free(buf2);\r | |
1363 | return NS_UNAVAIL;\r | |
1364 | }\r | |
1365 | \r | |
1366 | res = __res_get_state();\r | |
1367 | if (res == NULL) {\r | |
1368 | free(buf);\r | |
1369 | free(buf2);\r | |
1370 | return NS_NOTFOUND;\r | |
1371 | }\r | |
1372 | \r | |
1373 | if (res_searchN(name, &q, res) < 0) {\r | |
1374 | __res_put_state(res);\r | |
1375 | free(buf);\r | |
1376 | free(buf2);\r | |
1377 | return NS_NOTFOUND;\r | |
1378 | }\r | |
1379 | ai = getanswer(buf, q.n, q.name, q.qtype, pai);\r | |
1380 | if (ai) {\r | |
1381 | cur->ai_next = ai;\r | |
1382 | while (cur && cur->ai_next)\r | |
1383 | cur = cur->ai_next;\r | |
1384 | }\r | |
1385 | if (q.next) {\r | |
1386 | ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai);\r | |
1387 | if (ai)\r | |
1388 | cur->ai_next = ai;\r | |
1389 | }\r | |
1390 | free(buf);\r | |
1391 | free(buf2);\r | |
1392 | if (sentinel.ai_next == NULL) {\r | |
1393 | __res_put_state(res);\r | |
1394 | switch (h_errno) {\r | |
1395 | case HOST_NOT_FOUND:\r | |
1396 | return NS_NOTFOUND;\r | |
1397 | case TRY_AGAIN:\r | |
1398 | return NS_TRYAGAIN;\r | |
1399 | default:\r | |
1400 | return NS_UNAVAIL;\r | |
1401 | }\r | |
1402 | }\r | |
1403 | \r | |
1404 | if (res->nsort)\r | |
1405 | aisort(&sentinel, res);\r | |
1406 | \r | |
1407 | __res_put_state(res);\r | |
1408 | \r | |
1409 | *((struct addrinfo **)rv) = sentinel.ai_next;\r | |
1410 | return NS_SUCCESS;\r | |
1411 | }\r | |
1412 | \r | |
1413 | static void\r | |
1414 | _sethtent(FILE **hostf)\r | |
1415 | {\r | |
1416 | \r | |
1417 | if (!*hostf)\r | |
1418 | *hostf = fopen(_PATH_HOSTS, "r" );\r | |
1419 | else\r | |
1420 | rewind(*hostf);\r | |
1421 | }\r | |
1422 | \r | |
1423 | static void\r | |
1424 | _endhtent(FILE **hostf)\r | |
1425 | {\r | |
1426 | \r | |
1427 | if (*hostf) {\r | |
1428 | (void) fclose(*hostf);\r | |
1429 | *hostf = NULL;\r | |
1430 | }\r | |
1431 | }\r | |
1432 | \r | |
1433 | static struct addrinfo *\r | |
1434 | _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)\r | |
1435 | {\r | |
1436 | char *p;\r | |
1437 | char *cp, *tname, *cname;\r | |
1438 | struct addrinfo hints, *res0, *res;\r | |
1439 | int error;\r | |
1440 | const char *addr;\r | |
1441 | static char hostbuf[8*1024];\r | |
1442 | \r | |
1443 | _DIAGASSERT(name != NULL);\r | |
1444 | _DIAGASSERT(pai != NULL);\r | |
1445 | \r | |
1446 | if (!*hostf && ( NULL == (*hostf = fopen(_PATH_HOSTS, "r" ))))\r | |
1447 | return (NULL);\r | |
1448 | again:\r | |
1449 | if ( NULL == (p = fgets(hostbuf, sizeof hostbuf, *hostf)))\r | |
1450 | return (NULL);\r | |
1451 | if (*p == '#')\r | |
1452 | goto again;\r | |
1453 | if ( NULL == (cp = strpbrk(p, "#\n")))\r | |
1454 | goto again;\r | |
1455 | *cp = '\0';\r | |
1456 | if ( NULL == (cp = strpbrk(p, " \t")))\r | |
1457 | goto again;\r | |
1458 | *cp++ = '\0';\r | |
1459 | addr = p;\r | |
1460 | /* if this is not something we're looking for, skip it. */\r | |
1461 | cname = NULL;\r | |
1462 | while (cp && *cp) {\r | |
1463 | if (*cp == ' ' || *cp == '\t') {\r | |
1464 | cp++;\r | |
1465 | continue;\r | |
1466 | }\r | |
1467 | if (!cname)\r | |
1468 | cname = cp;\r | |
1469 | tname = cp;\r | |
1470 | if ((cp = strpbrk(cp, " \t")) != NULL)\r | |
1471 | *cp++ = '\0';\r | |
1472 | if (strcasecmp(name, tname) == 0)\r | |
1473 | goto found;\r | |
1474 | }\r | |
1475 | goto again;\r | |
1476 | \r | |
1477 | found:\r | |
1478 | hints = *pai;\r | |
1479 | hints.ai_flags = AI_NUMERICHOST;\r | |
1480 | error = getaddrinfo(addr, NULL, &hints, &res0);\r | |
1481 | if (error)\r | |
1482 | goto again;\r | |
1483 | for (res = res0; res; res = res->ai_next) {\r | |
1484 | /* cover it up */\r | |
1485 | res->ai_flags = pai->ai_flags;\r | |
1486 | \r | |
1487 | if (pai->ai_flags & AI_CANONNAME) {\r | |
1488 | if (get_canonname(pai, res, cname) != 0) {\r | |
1489 | freeaddrinfo(res0);\r | |
1490 | goto again;\r | |
1491 | }\r | |
1492 | }\r | |
1493 | }\r | |
1494 | return res0;\r | |
1495 | }\r | |
1496 | \r | |
1497 | /*ARGSUSED*/\r | |
1498 | static int\r | |
1499 | _files_getaddrinfo(void *rv, void *cb_data, va_list ap)\r | |
1500 | {\r | |
1501 | const char *name;\r | |
1502 | const struct addrinfo *pai;\r | |
1503 | struct addrinfo sentinel, *cur;\r | |
1504 | struct addrinfo *p;\r | |
1505 | #ifndef _REENTRANT\r | |
1506 | static\r | |
1507 | #endif\r | |
1508 | FILE *hostf = NULL;\r | |
1509 | \r | |
1510 | name = va_arg(ap, char *);\r | |
1511 | pai = va_arg(ap, const struct addrinfo *);\r | |
1512 | \r | |
1513 | memset(&sentinel, 0, sizeof(sentinel));\r | |
1514 | cur = &sentinel;\r | |
1515 | \r | |
1516 | _sethtent(&hostf);\r | |
1517 | while ((p = _gethtent(&hostf, name, pai)) != NULL) {\r | |
1518 | cur->ai_next = p;\r | |
1519 | while (cur && cur->ai_next)\r | |
1520 | cur = cur->ai_next;\r | |
1521 | }\r | |
1522 | _endhtent(&hostf);\r | |
1523 | \r | |
1524 | *((struct addrinfo **)rv) = sentinel.ai_next;\r | |
1525 | if (sentinel.ai_next == NULL)\r | |
1526 | return NS_NOTFOUND;\r | |
1527 | return NS_SUCCESS;\r | |
1528 | }\r | |
1529 | \r | |
1530 | #ifdef YP\r | |
1531 | /*ARGSUSED*/\r | |
1532 | static struct addrinfo *\r | |
1533 | _yphostent(char *line, const struct addrinfo *pai)\r | |
1534 | {\r | |
1535 | struct addrinfo sentinel, *cur;\r | |
1536 | struct addrinfo hints, *res, *res0;\r | |
1537 | int error;\r | |
1538 | char *p;\r | |
1539 | const char *addr, *canonname;\r | |
1540 | char *nextline;\r | |
1541 | char *cp;\r | |
1542 | \r | |
1543 | _DIAGASSERT(line != NULL);\r | |
1544 | _DIAGASSERT(pai != NULL);\r | |
1545 | \r | |
1546 | p = line;\r | |
1547 | addr = canonname = NULL;\r | |
1548 | \r | |
1549 | memset(&sentinel, 0, sizeof(sentinel));\r | |
1550 | cur = &sentinel;\r | |
1551 | \r | |
1552 | nextline:\r | |
1553 | /* terminate line */\r | |
1554 | cp = strchr(p, '\n');\r | |
1555 | if (cp) {\r | |
1556 | *cp++ = '\0';\r | |
1557 | nextline = cp;\r | |
1558 | } else\r | |
1559 | nextline = NULL;\r | |
1560 | \r | |
1561 | cp = strpbrk(p, " \t");\r | |
1562 | if (cp == NULL) {\r | |
1563 | if (canonname == NULL)\r | |
1564 | return (NULL);\r | |
1565 | else\r | |
1566 | goto done;\r | |
1567 | }\r | |
1568 | *cp++ = '\0';\r | |
1569 | \r | |
1570 | addr = p;\r | |
1571 | \r | |
1572 | while (cp && *cp) {\r | |
1573 | if (*cp == ' ' || *cp == '\t') {\r | |
1574 | cp++;\r | |
1575 | continue;\r | |
1576 | }\r | |
1577 | if (!canonname)\r | |
1578 | canonname = cp;\r | |
1579 | if ((cp = strpbrk(cp, " \t")) != NULL)\r | |
1580 | *cp++ = '\0';\r | |
1581 | }\r | |
1582 | \r | |
1583 | hints = *pai;\r | |
1584 | hints.ai_flags = AI_NUMERICHOST;\r | |
1585 | error = getaddrinfo(addr, NULL, &hints, &res0);\r | |
1586 | if (error == 0) {\r | |
1587 | for (res = res0; res; res = res->ai_next) {\r | |
1588 | /* cover it up */\r | |
1589 | res->ai_flags = pai->ai_flags;\r | |
1590 | \r | |
1591 | if (pai->ai_flags & AI_CANONNAME)\r | |
1592 | (void)get_canonname(pai, res, canonname);\r | |
1593 | }\r | |
1594 | } else\r | |
1595 | res0 = NULL;\r | |
1596 | if (res0) {\r | |
1597 | cur->ai_next = res0;\r | |
1598 | while (cur->ai_next)\r | |
1599 | cur = cur->ai_next;\r | |
1600 | }\r | |
1601 | \r | |
1602 | if (nextline) {\r | |
1603 | p = nextline;\r | |
1604 | goto nextline;\r | |
1605 | }\r | |
1606 | \r | |
1607 | done:\r | |
1608 | return sentinel.ai_next;\r | |
1609 | }\r | |
1610 | \r | |
1611 | /*ARGSUSED*/\r | |
1612 | static int\r | |
1613 | _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)\r | |
1614 | {\r | |
1615 | struct addrinfo sentinel, *cur;\r | |
1616 | struct addrinfo *ai = NULL;\r | |
1617 | char *ypbuf;\r | |
1618 | int ypbuflen, r;\r | |
1619 | const char *name;\r | |
1620 | const struct addrinfo *pai;\r | |
1621 | char *ypdomain;\r | |
1622 | \r | |
1623 | if (_yp_check(&ypdomain) == 0)\r | |
1624 | return NS_UNAVAIL;\r | |
1625 | \r | |
1626 | name = va_arg(ap, char *);\r | |
1627 | pai = va_arg(ap, const struct addrinfo *);\r | |
1628 | \r | |
1629 | memset(&sentinel, 0, sizeof(sentinel));\r | |
1630 | cur = &sentinel;\r | |
1631 | \r | |
1632 | /* hosts.byname is only for IPv4 (Solaris8) */\r | |
1633 | if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {\r | |
1634 | r = yp_match(ypdomain, "hosts.byname", name,\r | |
1635 | (int)strlen(name), &ypbuf, &ypbuflen);\r | |
1636 | if (r == 0) {\r | |
1637 | struct addrinfo ai4;\r | |
1638 | \r | |
1639 | ai4 = *pai;\r | |
1640 | ai4.ai_family = AF_INET;\r | |
1641 | ai = _yphostent(ypbuf, &ai4);\r | |
1642 | if (ai) {\r | |
1643 | cur->ai_next = ai;\r | |
1644 | while (cur && cur->ai_next)\r | |
1645 | cur = cur->ai_next;\r | |
1646 | }\r | |
1647 | }\r | |
1648 | free(ypbuf);\r | |
1649 | }\r | |
1650 | \r | |
1651 | /* ipnodes.byname can hold both IPv4/v6 */\r | |
1652 | r = yp_match(ypdomain, "ipnodes.byname", name,\r | |
1653 | (int)strlen(name), &ypbuf, &ypbuflen);\r | |
1654 | if (r == 0) {\r | |
1655 | ai = _yphostent(ypbuf, pai);\r | |
1656 | if (ai)\r | |
1657 | cur->ai_next = ai;\r | |
1658 | free(ypbuf);\r | |
1659 | }\r | |
1660 | \r | |
1661 | if (sentinel.ai_next == NULL) {\r | |
1662 | h_errno = HOST_NOT_FOUND;\r | |
1663 | return NS_NOTFOUND;\r | |
1664 | }\r | |
1665 | *((struct addrinfo **)rv) = sentinel.ai_next;\r | |
1666 | return NS_SUCCESS;\r | |
1667 | }\r | |
1668 | #endif\r | |
1669 | \r | |
1670 | /* resolver logic */\r | |
1671 | \r | |
1672 | /*\r | |
1673 | * Formulate a normal query, send, and await answer.\r | |
1674 | * Returned answer is placed in supplied buffer "answer".\r | |
1675 | * Perform preliminary check of answer, returning success only\r | |
1676 | * if no error is indicated and the answer count is nonzero.\r | |
1677 | * Return the size of the response on success, -1 on error.\r | |
1678 | * Error number is left in h_errno.\r | |
1679 | *\r | |
1680 | * Caller must parse answer and determine whether it answers the question.\r | |
1681 | */\r | |
1682 | static int\r | |
1683 | res_queryN(const char *name, /* domain name */ struct res_target *target,\r | |
1684 | res_state res)\r | |
1685 | {\r | |
1686 | static u_char buf[MAXPACKET];\r | |
1687 | HEADER *hp;\r | |
1688 | int n;\r | |
1689 | struct res_target *t;\r | |
1690 | int rcode;\r | |
1691 | int ancount;\r | |
1692 | \r | |
1693 | _DIAGASSERT(name != NULL);\r | |
1694 | /* XXX: target may be NULL??? */\r | |
1695 | \r | |
1696 | rcode = NOERROR;\r | |
1697 | ancount = 0;\r | |
1698 | \r | |
1699 | for (t = target; t; t = t->next) {\r | |
1700 | int class, type;\r | |
1701 | u_char *answer;\r | |
1702 | int anslen;\r | |
1703 | \r | |
1704 | hp = (HEADER *)(void *)t->answer;\r | |
1705 | hp->rcode = NOERROR; /* default */\r | |
1706 | \r | |
1707 | /* make it easier... */\r | |
1708 | class = t->qclass;\r | |
1709 | type = t->qtype;\r | |
1710 | answer = t->answer;\r | |
1711 | anslen = t->anslen;\r | |
1712 | #ifdef DEBUG\r | |
1713 | if (res->options & RES_DEBUG)\r | |
1714 | printf(";; res_nquery(%s, %d, %d)\n", name, class, type);\r | |
1715 | #endif\r | |
1716 | \r | |
1717 | n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,\r | |
1718 | buf, sizeof(buf));\r | |
1719 | #ifdef RES_USE_EDNS0\r | |
1720 | if (n > 0 && (res->options & RES_USE_EDNS0) != 0)\r | |
1721 | n = res_nopt(res, n, buf, sizeof(buf), anslen);\r | |
1722 | #endif\r | |
1723 | if (n <= 0) {\r | |
1724 | #ifdef DEBUG\r | |
1725 | if (res->options & RES_DEBUG)\r | |
1726 | printf(";; res_nquery: mkquery failed\n");\r | |
1727 | #endif\r | |
1728 | h_errno = NO_RECOVERY;\r | |
1729 | return n;\r | |
1730 | }\r | |
1731 | n = res_nsend(res, buf, n, answer, anslen);\r | |
1732 | #if 0\r | |
1733 | if (n < 0) {\r | |
1734 | #ifdef DEBUG\r | |
1735 | if (res->options & RES_DEBUG)\r | |
1736 | printf(";; res_query: send error\n");\r | |
1737 | #endif\r | |
1738 | h_errno = TRY_AGAIN;\r | |
1739 | return n;\r | |
1740 | }\r | |
1741 | #endif\r | |
1742 | \r | |
1743 | if (n < 0 || hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {\r | |
1744 | rcode = hp->rcode; /* record most recent error */\r | |
1745 | #ifdef DEBUG\r | |
1746 | if (res->options & RES_DEBUG)\r | |
1747 | printf(";; rcode = %u, ancount=%u\n", hp->rcode,\r | |
1748 | ntohs(hp->ancount));\r | |
1749 | #endif\r | |
1750 | continue;\r | |
1751 | }\r | |
1752 | \r | |
1753 | ancount += ntohs(hp->ancount);\r | |
1754 | \r | |
1755 | t->n = n;\r | |
1756 | }\r | |
1757 | \r | |
1758 | if (ancount == 0) {\r | |
1759 | switch (rcode) {\r | |
1760 | case NXDOMAIN:\r | |
1761 | h_errno = HOST_NOT_FOUND;\r | |
1762 | break;\r | |
1763 | case SERVFAIL:\r | |
1764 | h_errno = TRY_AGAIN;\r | |
1765 | break;\r | |
1766 | case NOERROR:\r | |
1767 | h_errno = NO_DATA;\r | |
1768 | break;\r | |
1769 | case FORMERR:\r | |
1770 | case NOTIMP:\r | |
1771 | case REFUSED:\r | |
1772 | default:\r | |
1773 | h_errno = NO_RECOVERY;\r | |
1774 | break;\r | |
1775 | }\r | |
1776 | return -1;\r | |
1777 | }\r | |
1778 | return ancount;\r | |
1779 | }\r | |
1780 | \r | |
1781 | /*\r | |
1782 | * Formulate a normal query, send, and retrieve answer in supplied buffer.\r | |
1783 | * Return the size of the response on success, -1 on error.\r | |
1784 | * If enabled, implement search rules until answer or unrecoverable failure\r | |
1785 | * is detected. Error code, if any, is left in h_errno.\r | |
1786 | */\r | |
1787 | static int\r | |
1788 | res_searchN(const char *name, struct res_target *target, res_state res)\r | |
1789 | {\r | |
1790 | const char *cp, * const *domain;\r | |
1791 | HEADER *hp;\r | |
1792 | u_int dots;\r | |
1793 | int trailing_dot, ret, saved_herrno;\r | |
1794 | int got_nodata = 0, got_servfail = 0, tried_as_is = 0;\r | |
1795 | \r | |
1796 | _DIAGASSERT(name != NULL);\r | |
1797 | _DIAGASSERT(target != NULL);\r | |
1798 | \r | |
1799 | hp = (HEADER *)(void *)target->answer; /*XXX*/\r | |
1800 | \r | |
1801 | errno = 0;\r | |
1802 | h_errno = HOST_NOT_FOUND; /* default, if we never query */\r | |
1803 | dots = 0;\r | |
1804 | for (cp = name; *cp; cp++)\r | |
1805 | dots += (*cp == '.');\r | |
1806 | trailing_dot = 0;\r | |
1807 | if (cp > name && *--cp == '.')\r | |
1808 | trailing_dot++;\r | |
1809 | \r | |
1810 | /*\r | |
1811 | * if there aren't any dots, it could be a user-level alias\r | |
1812 | */\r | |
1813 | if (!dots && (cp = __hostalias(name)) != NULL) {\r | |
1814 | ret = res_queryN(cp, target, res);\r | |
1815 | return ret;\r | |
1816 | }\r | |
1817 | \r | |
1818 | /*\r | |
1819 | * If there are dots in the name already, let's just give it a try\r | |
1820 | * 'as is'. The threshold can be set with the "ndots" option.\r | |
1821 | */\r | |
1822 | saved_herrno = -1;\r | |
1823 | if (dots >= res->ndots) {\r | |
1824 | ret = res_querydomainN(name, NULL, target, res);\r | |
1825 | if (ret > 0)\r | |
1826 | return (ret);\r | |
1827 | saved_herrno = h_errno;\r | |
1828 | tried_as_is++;\r | |
1829 | }\r | |
1830 | \r | |
1831 | /*\r | |
1832 | * We do at least one level of search if\r | |
1833 | * - there is no dot and RES_DEFNAME is set, or\r | |
1834 | * - there is at least one dot, there is no trailing dot,\r | |
1835 | * and RES_DNSRCH is set.\r | |
1836 | */\r | |
1837 | if ((!dots && (res->options & RES_DEFNAMES)) ||\r | |
1838 | (dots && !trailing_dot && (res->options & RES_DNSRCH))) {\r | |
1839 | int done = 0;\r | |
1840 | \r | |
1841 | for (domain = (const char * const *)res->dnsrch;\r | |
1842 | *domain && !done;\r | |
1843 | domain++) {\r | |
1844 | \r | |
1845 | ret = res_querydomainN(name, *domain, target, res);\r | |
1846 | if (ret > 0)\r | |
1847 | return ret;\r | |
1848 | \r | |
1849 | /*\r | |
1850 | * If no server present, give up.\r | |
1851 | * If name isn't found in this domain,\r | |
1852 | * keep trying higher domains in the search list\r | |
1853 | * (if that's enabled).\r | |
1854 | * On a NO_DATA error, keep trying, otherwise\r | |
1855 | * a wildcard entry of another type could keep us\r | |
1856 | * from finding this entry higher in the domain.\r | |
1857 | * If we get some other error (negative answer or\r | |
1858 | * server failure), then stop searching up,\r | |
1859 | * but try the input name below in case it's\r | |
1860 | * fully-qualified.\r | |
1861 | */\r | |
1862 | if (errno == ECONNREFUSED) {\r | |
1863 | h_errno = TRY_AGAIN;\r | |
1864 | return -1;\r | |
1865 | }\r | |
1866 | \r | |
1867 | switch (h_errno) {\r | |
1868 | case NO_DATA:\r | |
1869 | got_nodata++;\r | |
1870 | /* FALLTHROUGH */\r | |
1871 | case HOST_NOT_FOUND:\r | |
1872 | /* keep trying */\r | |
1873 | break;\r | |
1874 | case TRY_AGAIN:\r | |
1875 | if (hp->rcode == SERVFAIL) {\r | |
1876 | /* try next search element, if any */\r | |
1877 | got_servfail++;\r | |
1878 | break;\r | |
1879 | }\r | |
1880 | /* FALLTHROUGH */\r | |
1881 | default:\r | |
1882 | /* anything else implies that we're done */\r | |
1883 | done++;\r | |
1884 | }\r | |
1885 | /*\r | |
1886 | * if we got here for some reason other than DNSRCH,\r | |
1887 | * we only wanted one iteration of the loop, so stop.\r | |
1888 | */\r | |
1889 | if (!(res->options & RES_DNSRCH))\r | |
1890 | done++;\r | |
1891 | }\r | |
1892 | }\r | |
1893 | \r | |
1894 | /*\r | |
1895 | * if we have not already tried the name "as is", do that now.\r | |
1896 | * note that we do this regardless of how many dots were in the\r | |
1897 | * name or whether it ends with a dot.\r | |
1898 | */\r | |
1899 | if (!tried_as_is) {\r | |
1900 | ret = res_querydomainN(name, NULL, target, res);\r | |
1901 | if (ret > 0)\r | |
1902 | return ret;\r | |
1903 | }\r | |
1904 | \r | |
1905 | /*\r | |
1906 | * if we got here, we didn't satisfy the search.\r | |
1907 | * if we did an initial full query, return that query's h_errno\r | |
1908 | * (note that we wouldn't be here if that query had succeeded).\r | |
1909 | * else if we ever got a nodata, send that back as the reason.\r | |
1910 | * else send back meaningless h_errno, that being the one from\r | |
1911 | * the last DNSRCH we did.\r | |
1912 | */\r | |
1913 | if (saved_herrno != -1)\r | |
1914 | h_errno = saved_herrno;\r | |
1915 | else if (got_nodata)\r | |
1916 | h_errno = NO_DATA;\r | |
1917 | else if (got_servfail)\r | |
1918 | h_errno = TRY_AGAIN;\r | |
1919 | return -1;\r | |
1920 | }\r | |
1921 | \r | |
1922 | /*\r | |
1923 | * Perform a call on res_query on the concatenation of name and domain,\r | |
1924 | * removing a trailing dot from name if domain is NULL.\r | |
1925 | */\r | |
1926 | static int\r | |
1927 | res_querydomainN(const char *name, const char *domain,\r | |
1928 | struct res_target *target, res_state res)\r | |
1929 | {\r | |
1930 | char nbuf[MAXDNAME];\r | |
1931 | const char *longname = nbuf;\r | |
1932 | size_t n, d;\r | |
1933 | \r | |
1934 | _DIAGASSERT(name != NULL);\r | |
1935 | /* XXX: target may be NULL??? */\r | |
1936 | \r | |
1937 | #ifdef DEBUG\r | |
1938 | if (res->options & RES_DEBUG)\r | |
1939 | printf(";; res_querydomain(%s, %s)\n",\r | |
1940 | name, domain?domain:"<Nil>");\r | |
1941 | #endif\r | |
1942 | if (domain == NULL) {\r | |
1943 | /*\r | |
1944 | * Check for trailing '.';\r | |
1945 | * copy without '.' if present.\r | |
1946 | */\r | |
1947 | n = strlen(name);\r | |
1948 | if (n + 1 > sizeof(nbuf)) {\r | |
1949 | h_errno = NO_RECOVERY;\r | |
1950 | return -1;\r | |
1951 | }\r | |
1952 | if (n > 0 && name[--n] == '.') {\r | |
1953 | strncpy(nbuf, name, n);\r | |
1954 | nbuf[n] = '\0';\r | |
1955 | } else\r | |
1956 | longname = name;\r | |
1957 | } else {\r | |
1958 | n = strlen(name);\r | |
1959 | d = strlen(domain);\r | |
1960 | if (n + 1 + d + 1 > sizeof(nbuf)) {\r | |
1961 | h_errno = NO_RECOVERY;\r | |
1962 | return -1;\r | |
1963 | }\r | |
1964 | snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);\r | |
1965 | }\r | |
1966 | return res_queryN(longname, target, res);\r | |
1967 | }\r |