Commit | Line | Data |
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07554ccd MW |
1 | /* |
2 | * addrfam.c | |
3 | * - address-family specific code | |
4 | */ | |
5 | /* | |
6 | * This file is part of adns, which is | |
7 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson | |
8 | * Copyright (C) 1999-2000,2003,2006 Tony Finch | |
9 | * Copyright (C) 1991 Massachusetts Institute of Technology | |
10 | * (See the file INSTALL for full details.) | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
7f8bbe29 | 14 | * the Free Software Foundation; either version 3, or (at your option) |
07554ccd MW |
15 | * any later version. |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
8c09a4c6 | 23 | * along with this program; if not, write to the Free Software Foundation. |
07554ccd MW |
24 | */ |
25 | ||
26 | #include <stdlib.h> | |
27 | #include <errno.h> | |
28 | #include <limits.h> | |
29 | #include <unistd.h> | |
5806b745 IJ |
30 | #include <inttypes.h> |
31 | #include <stddef.h> | |
32 | #include <stdbool.h> | |
07554ccd MW |
33 | |
34 | #include <sys/types.h> | |
35 | #include <sys/socket.h> | |
36 | #include <netinet/in.h> | |
37 | #include <arpa/inet.h> | |
5806b745 | 38 | #include <net/if.h> |
07554ccd MW |
39 | |
40 | #include "internal.h" | |
41 | ||
42 | /* | |
43 | * General address-family operations. | |
44 | */ | |
45 | ||
468a4293 IJ |
46 | #define SIN(cnst, sa) ((void)(sa)->sa_family, (cnst struct sockaddr_in *)(sa)) |
47 | #define SIN6(cnst, sa) ((void)(sa)->sa_family, (cnst struct sockaddr_in6 *)(sa)) | |
07554ccd | 48 | |
6380363d | 49 | static void unknown_af(int af) NONRETURNING; |
07554ccd MW |
50 | static void unknown_af(int af) { |
51 | fprintf(stderr, "ADNS INTERNAL: unknown address family %d\n", af); | |
52 | abort(); | |
53 | } | |
54 | ||
e0fc85c4 IJ |
55 | /* |
56 | * SOCKADDR_IN_IN6(CNST, struct sockaddr *sa, SIN, { | |
57 | * // struct sockaddr_in *const SIN; // implicitly | |
58 | * code for inet; | |
59 | * }, { | |
60 | * // struct sockaddr_in6 *const SIN6; // implicitly | |
61 | * code for inet6; | |
62 | * }) | |
63 | * | |
64 | * SOCKADDR_IN_IN6_PAIR(CNST, struct sockaddr *sa, SINA, | |
65 | * struct sockaddr *sb, SINB, { | |
66 | * // struct sockaddr_in *const SINA; // implicitly | |
67 | * // struct sockaddr_in *const SINB; // implicitly | |
68 | * code for inet; | |
69 | * },{ | |
70 | * // struct sockaddr_in6 *const SINA6; // implicitly | |
71 | * // struct sockaddr_in6 *const SINB6; // implicitly | |
72 | * code for inet6; | |
73 | * }); | |
74 | * | |
75 | * SOCKADDR_IN_IN6_OTHER(CNST, struct sockaddr *sa, SIN, { in }, { in6 }, { | |
76 | * code for other address family | |
77 | * }) | |
78 | * | |
79 | * AF_IN_IN6_OTHER(af, { in }, { in6 }, { other }) | |
80 | * | |
81 | * Executes the first or second block according to the AF in sa. CNST | |
82 | * may be `const' or empty. For _PAIR, sa and sb must be same AF. | |
83 | * | |
84 | * All except _OTHER handle unknown AFs with unknown_af. | |
85 | * | |
86 | * Code blocks may not contain , outside parens. | |
87 | */ | |
88 | #define AF_IN_IN6_OTHER(af, for_inet, for_inet6, other) \ | |
89 | if ((af) == AF_INET) { \ | |
90 | for_inet \ | |
91 | } else if ((af) == AF_INET6) { \ | |
92 | for_inet6 \ | |
93 | } else { \ | |
94 | other \ | |
95 | } | |
96 | #define SOCKADDR_IN_IN6_OTHER(cnst, sa, sin, for_inet, for_inet6, other) \ | |
468a4293 IJ |
97 | AF_IN_IN6_OTHER((sa)->sa_family, { \ |
98 | cnst struct sockaddr_in *const sin = SIN(cnst,(sa)); \ | |
e0fc85c4 IJ |
99 | for_inet \ |
100 | }, { \ | |
468a4293 | 101 | cnst struct sockaddr_in6 *const sin##6 = SIN6(cnst,(sa)); \ |
e0fc85c4 IJ |
102 | for_inet6 \ |
103 | }, \ | |
104 | other \ | |
105 | ) | |
106 | #define SOCKADDR_IN_IN6(cnst, sa, sin, for_inet, for_inet6) \ | |
107 | SOCKADDR_IN_IN6_OTHER(cnst, sa, sin, for_inet, for_inet6, { \ | |
108 | unknown_af((sa)->sa_family); \ | |
109 | }) | |
110 | #define SOCKADDR_IN_IN6_PAIR(cnst, sa, sina, sb, sinb, for_inet, for_inet6) \ | |
111 | do{ \ | |
112 | assert((sa)->sa_family == (sb)->sa_family); \ | |
113 | SOCKADDR_IN_IN6(cnst, sa, sina, { \ | |
468a4293 | 114 | cnst struct sockaddr_in *const sinb = SIN(cnst,(sb)); \ |
e0fc85c4 | 115 | for_inet \ |
468a4293 IJ |
116 | }, { \ |
117 | cnst struct sockaddr_in6 *const sinb##6 = SIN6(cnst,(sb)); \ | |
e0fc85c4 IJ |
118 | for_inet6 \ |
119 | }); \ | |
120 | }while(0) | |
121 | ||
82ae109e IJ |
122 | int adns__addrs_equal_raw(const struct sockaddr *a, |
123 | int bf, const void *b) { | |
124 | if (a->sa_family != bf) return 0; | |
e0fc85c4 IJ |
125 | |
126 | SOCKADDR_IN_IN6(const, a, sin, { | |
127 | return sin->sin_addr.s_addr == ((const struct in_addr*)b)->s_addr; | |
128 | }, { | |
129 | return !memcmp(&sin6->sin6_addr, b, sizeof(struct in6_addr)); | |
130 | }); | |
07554ccd MW |
131 | } |
132 | ||
82ae109e IJ |
133 | int adns__addrs_equal(const adns_sockaddr *a, const adns_sockaddr *b) { |
134 | return adns__addrs_equal_raw(&a->sa, b->sa.sa_family, | |
135 | adns__sockaddr_addr(&b->sa)); | |
136 | } | |
137 | ||
138 | int adns__sockaddrs_equal(const struct sockaddr *sa, | |
139 | const struct sockaddr *sb) { | |
140 | if (!adns__addrs_equal_raw(sa, sb->sa_family, adns__sockaddr_addr(sb))) | |
141 | return 0; | |
e0fc85c4 IJ |
142 | SOCKADDR_IN_IN6_PAIR(const, sa, sina, sb, sinb, { |
143 | return sina->sin_port == sinb->sin_port; | |
144 | }, { | |
145 | return sina6->sin6_port == sinb6->sin6_port && | |
146 | sina6->sin6_scope_id == sinb6->sin6_scope_id; | |
147 | }); | |
07554ccd MW |
148 | } |
149 | ||
150 | int adns__addr_width(int af) { | |
e0fc85c4 IJ |
151 | AF_IN_IN6_OTHER(af, { |
152 | return 32; | |
153 | }, { | |
154 | return 128; | |
155 | }, { | |
156 | unknown_af(af); | |
157 | }); | |
07554ccd MW |
158 | } |
159 | ||
82ae109e | 160 | void adns__prefix_mask(adns_sockaddr *sa, int len) { |
e0fc85c4 IJ |
161 | SOCKADDR_IN_IN6(, &sa->sa, sin, { |
162 | assert(len <= 32); | |
163 | sin->sin_addr.s_addr= htonl(!len ? 0 : 0xffffffff << (32-len)); | |
164 | }, { | |
165 | int i= len/8; | |
166 | int j= len%8; | |
167 | unsigned char *m= sin6->sin6_addr.s6_addr; | |
168 | assert(len <= 128); | |
169 | memset(m, 0xff, i); | |
170 | if (j) m[i++]= (0xff << (8-j)) & 0xff; | |
171 | memset(m+i, 0, 16-i); | |
172 | }); | |
07554ccd MW |
173 | } |
174 | ||
82ae109e | 175 | int adns__guess_prefix_length(const adns_sockaddr *sa) { |
e0fc85c4 IJ |
176 | SOCKADDR_IN_IN6(const, &sa->sa, sin, { |
177 | unsigned a= (ntohl(sin->sin_addr.s_addr) >> 24) & 0xff; | |
178 | if (a < 128) return 8; | |
179 | else if (a < 192) return 16; | |
180 | else if (a < 224) return 24; | |
181 | else return -1; | |
182 | }, { | |
183 | (void)sin6; | |
184 | return 64; | |
185 | }); | |
07554ccd MW |
186 | } |
187 | ||
82ae109e IJ |
188 | int adns__addr_matches(int af, const void *addr, |
189 | const adns_sockaddr *base, const adns_sockaddr *mask) | |
07554ccd | 190 | { |
82ae109e | 191 | if (af != base->sa.sa_family) return 0; |
e0fc85c4 IJ |
192 | SOCKADDR_IN_IN6_PAIR(const, &base->sa, sbase, &mask->sa, smask, { |
193 | const struct in_addr *v4 = addr; | |
194 | return (v4->s_addr & smask->sin_addr.s_addr) | |
195 | == sbase->sin_addr.s_addr; | |
196 | }, { | |
197 | int i; | |
198 | const char *a= addr; | |
199 | const char *b= sbase6->sin6_addr.s6_addr; | |
200 | const char *m= smask6->sin6_addr.s6_addr; | |
201 | for (i = 0; i < 16; i++) | |
202 | if ((a[i] & m[i]) != b[i]) return 0; | |
203 | return 1; | |
204 | }); | |
07554ccd MW |
205 | } |
206 | ||
82ae109e | 207 | const void *adns__sockaddr_addr(const struct sockaddr *sa) { |
e0fc85c4 IJ |
208 | SOCKADDR_IN_IN6(const, sa, sin, { |
209 | return &sin->sin_addr; | |
210 | }, { | |
211 | return &sin6->sin6_addr; | |
212 | }); | |
07554ccd MW |
213 | } |
214 | ||
82ae109e | 215 | void adns__addr_inject(const void *a, adns_sockaddr *sa) { |
e0fc85c4 IJ |
216 | SOCKADDR_IN_IN6( , &sa->sa, sin, { |
217 | memcpy(&sin->sin_addr, a, sizeof(sin->sin_addr)); | |
218 | }, { | |
219 | memcpy(&sin6->sin6_addr, a, sizeof(sin6->sin6_addr)); | |
220 | }); | |
07554ccd | 221 | } |
5806b745 IJ |
222 | |
223 | /* | |
224 | * addr2text and text2addr | |
225 | */ | |
226 | ||
227 | #define ADDRFAM_DEBUG | |
228 | #ifdef ADDRFAM_DEBUG | |
229 | static void af_debug_func(const char *fmt, ...) { | |
230 | int esave= errno; | |
231 | va_list al; | |
232 | va_start(al,fmt); | |
233 | vfprintf(stderr,fmt,al); | |
234 | va_end(al); | |
235 | errno= esave; | |
236 | } | |
237 | # define af_debug(fmt,...) \ | |
238 | (af_debug_func("%s: " fmt "\n", __func__, __VA_ARGS__)) | |
239 | #else | |
240 | # define af_debug(fmt,...) ((void)("" fmt "", __VA_ARGS__)) | |
241 | #endif | |
242 | ||
243 | static bool addrtext_our_errno(int e) { | |
244 | return | |
245 | e==EAFNOSUPPORT || | |
246 | e==EINVAL || | |
247 | e==ENOSPC || | |
248 | e==ENOSYS; | |
249 | } | |
250 | ||
251 | static bool addrtext_scope_use_ifname(const struct sockaddr *sa) { | |
468a4293 | 252 | const struct in6_addr *in6= &SIN6(const,sa)->sin6_addr; |
5806b745 IJ |
253 | return |
254 | IN6_IS_ADDR_LINKLOCAL(in6) || | |
255 | IN6_IS_ADDR_MC_LINKLOCAL(in6); | |
256 | } | |
257 | ||
258 | int adns_text2addr(const char *text, uint16_t port, adns_queryflags flags, | |
259 | struct sockaddr *sa, socklen_t *salen_io) { | |
260 | int af; | |
261 | char copybuf[INET6_ADDRSTRLEN]; | |
262 | const char *parse=text; | |
263 | const char *scopestr=0; | |
264 | socklen_t needlen; | |
265 | void *dst; | |
266 | uint16_t *portp; | |
267 | ||
268 | #define INVAL(how) do{ \ | |
269 | af_debug("invalid: %s: `%s'", how, text); \ | |
270 | return EINVAL; \ | |
271 | }while(0) | |
272 | ||
273 | #define AFCORE(INETx,SINx,sinx) \ | |
274 | af= AF_##INETx; \ | |
468a4293 IJ |
275 | dst = &SINx(,sa)->sinx##_addr; \ |
276 | portp = &SINx(,sa)->sinx##_port; \ | |
277 | needlen= sizeof(*SINx(,sa)); | |
5806b745 IJ |
278 | |
279 | if (!strchr(text, ':')) { /* INET */ | |
280 | ||
281 | AFCORE(INET,SIN,sin); | |
282 | ||
283 | } else { /* INET6 */ | |
284 | ||
285 | AFCORE(INET6,SIN6,sin6); | |
286 | ||
287 | const char *percent= strchr(text, '%'); | |
288 | if (percent) { | |
289 | ptrdiff_t lhslen = percent - text; | |
290 | if (lhslen >= INET6_ADDRSTRLEN) INVAL("scoped addr lhs too long"); | |
291 | memcpy(copybuf, text, lhslen); | |
292 | copybuf[lhslen]= 0; | |
293 | ||
294 | parse= copybuf; | |
295 | scopestr= percent+1; | |
296 | ||
297 | af_debug("will parse scoped addr `%s' %% `%s'", parse, scopestr); | |
298 | } | |
299 | ||
300 | } | |
301 | ||
302 | #undef AFCORE | |
303 | ||
304 | if (scopestr && (flags & adns_qf_addrlit_scope_forbid)) | |
305 | INVAL("scoped addr but _scope_forbid"); | |
306 | ||
307 | if (*salen_io < needlen) { | |
308 | *salen_io = needlen; | |
309 | return ENOSPC; | |
310 | } | |
311 | ||
312 | memset(sa, 0, needlen); | |
313 | ||
314 | sa->sa_family= af; | |
315 | *portp = htons(port); | |
316 | ||
317 | if (af == AF_INET && !(flags & adns_qf_addrlit_ipv4_quadonly)) { | |
318 | /* we have to use inet_aton to deal with non-dotted-quad literals */ | |
468a4293 | 319 | int r= inet_aton(parse,&SIN(,sa)->sin_addr); |
5806b745 IJ |
320 | if (!r) INVAL("inet_aton rejected"); |
321 | } else { | |
322 | int r= inet_pton(af,parse,dst); | |
323 | if (!r) INVAL("inet_pton rejected"); | |
324 | assert(r>0); | |
325 | } | |
326 | ||
327 | if (scopestr) { | |
328 | errno=0; | |
329 | char *ep; | |
330 | unsigned long scope= strtoul(scopestr,&ep,10); | |
331 | if (errno==ERANGE) INVAL("numeric scope id too large for unsigned long"); | |
332 | assert(!errno); | |
333 | if (!*ep) { | |
334 | if (scope > ~(uint32_t)0) | |
335 | INVAL("numeric scope id too large for uint32_t"); | |
336 | } else { /* !!*ep */ | |
337 | if (flags & adns_qf_addrlit_scope_numeric) | |
338 | INVAL("non-numeric scope but _scope_numeric"); | |
339 | if (!addrtext_scope_use_ifname(sa)) { | |
340 | af_debug("cannot convert non-numeric scope" | |
341 | " in non-link-local addr `%s'", text); | |
342 | return ENOSYS; | |
343 | } | |
344 | errno= 0; | |
345 | scope= if_nametoindex(scopestr); | |
346 | if (!scope) { | |
347 | /* RFC3493 says "No errors are defined". It's not clear | |
348 | * whether that is supposed to mean if_nametoindex "can't | |
349 | * fail" (other than by the supplied name not being that of an | |
350 | * interface) which seems unrealistic, or that it conflates | |
351 | * all its errors together by failing to set errno, or simply | |
352 | * that they didn't bother to document the errors. | |
353 | * | |
354 | * glibc, FreeBSD and OpenBSD all set errno (to ENXIO when | |
355 | * appropriate). See Debian bug #749349. | |
356 | * | |
357 | * We attempt to deal with this by clearing errno to start | |
358 | * with, and then perhaps mapping the results. */ | |
359 | af_debug("if_nametoindex rejected scope name (errno=%s)", | |
360 | strerror(errno)); | |
361 | if (errno==0) { | |
362 | return ENXIO; | |
363 | } else if (addrtext_our_errno(errno)) { | |
364 | /* we use these for other purposes, urgh. */ | |
365 | perror("adns: adns_text2addr: if_nametoindex" | |
366 | " failed with unexpected error"); | |
367 | return EIO; | |
368 | } else { | |
369 | return errno; | |
370 | } | |
371 | } else { /* ix>0 */ | |
372 | if (scope > ~(uint32_t)0) { | |
373 | fprintf(stderr,"adns: adns_text2addr: if_nametoindex" | |
374 | " returned an interface index >=2^32 which will not fit" | |
375 | " in sockaddr_in6.sin6_scope_id"); | |
376 | return EIO; | |
377 | } | |
378 | } | |
379 | } /* else; !!*ep */ | |
380 | ||
468a4293 | 381 | SIN6(,sa)->sin6_scope_id= scope; |
5806b745 IJ |
382 | } /* if (scopestr) */ |
383 | ||
384 | *salen_io = needlen; | |
385 | return 0; | |
386 | } | |
387 | ||
388 | int adns_addr2text(const struct sockaddr *sa, adns_queryflags flags, | |
389 | char *buffer, int *buflen_io, int *port_r) { | |
390 | const void *src; | |
391 | int port; | |
392 | ||
393 | if (*buflen_io < ADNS_ADDR2TEXT_BUFLEN) { | |
394 | *buflen_io = ADNS_ADDR2TEXT_BUFLEN; | |
395 | return ENOSPC; | |
396 | } | |
397 | ||
e0fc85c4 IJ |
398 | SOCKADDR_IN_IN6_OTHER(const, sa, sin, { |
399 | src= &sin->sin_addr; port= sin->sin_port; | |
400 | }, { | |
401 | src= &sin6->sin6_addr; port= sin6->sin6_port; | |
402 | }, { | |
403 | return EAFNOSUPPORT; | |
404 | }); | |
5806b745 IJ |
405 | |
406 | const char *ok= inet_ntop(sa->sa_family, src, buffer, *buflen_io); | |
407 | assert(ok); | |
408 | ||
409 | if (sa->sa_family == AF_INET6) { | |
468a4293 | 410 | uint32_t scope = SIN6(const,sa)->sin6_scope_id; |
5806b745 IJ |
411 | if (scope) { |
412 | if (flags & adns_qf_addrlit_scope_forbid) | |
413 | return EINVAL; | |
414 | int scopeoffset = strlen(buffer); | |
415 | int remain = *buflen_io - scopeoffset; | |
416 | char *scopeptr = buffer + scopeoffset; | |
417 | assert(remain >= IF_NAMESIZE+1/*%*/); | |
418 | *scopeptr++= '%'; remain--; | |
419 | bool parsedname = 0; | |
c3a165f5 MW |
420 | af_debug("will print scoped addr `%.*s' %% %"PRIu32"", |
421 | scopeoffset,buffer, scope); | |
5806b745 IJ |
422 | if (scope <= UINT_MAX /* so we can pass it to if_indextoname */ |
423 | && !(flags & adns_qf_addrlit_scope_numeric) | |
424 | && addrtext_scope_use_ifname(sa)) { | |
425 | parsedname = if_indextoname(scope, scopeptr); | |
426 | if (!parsedname) { | |
427 | af_debug("if_indextoname rejected scope (errno=%s)", | |
428 | strerror(errno)); | |
429 | if (errno==ENXIO) { | |
430 | /* fair enough, show it as a number then */ | |
431 | } else if (addrtext_our_errno(errno)) { | |
432 | /* we use these for other purposes, urgh. */ | |
433 | perror("adns: adns_addr2text: if_indextoname" | |
434 | " failed with unexpected error"); | |
435 | return EIO; | |
436 | } else { | |
437 | return errno; | |
438 | } | |
439 | } | |
440 | } | |
441 | if (!parsedname) { | |
442 | int r = snprintf(scopeptr, remain, | |
443 | "%"PRIu32"", scope); | |
444 | assert(r < *buflen_io - scopeoffset); | |
445 | } | |
446 | af_debug("printed scoped addr `%s'", buffer); | |
447 | } | |
448 | } | |
449 | ||
450 | if (port_r) *port_r= ntohs(port); | |
451 | return 0; | |
452 | } | |
b0e8338a MW |
453 | |
454 | char *adns__sockaddr_ntoa(const struct sockaddr *sa, char *buf) { | |
455 | int err; | |
456 | int len= ADNS_ADDR2TEXT_BUFLEN; | |
457 | ||
458 | err= adns_addr2text(sa, 0, buf, &len, 0); | |
459 | if (err == EIO) | |
460 | err= adns_addr2text(sa, adns_qf_addrlit_scope_numeric, buf, &len, 0); | |
461 | assert(!err); | |
462 | return buf; | |
463 | } | |
51cb3de3 MW |
464 | |
465 | /* | |
466 | * Reverse-domain parsing and construction. | |
467 | */ | |
468 | ||
469 | int adns__make_reverse_domain(const struct sockaddr *sa, const char *zone, | |
470 | char **buf_io, size_t bufsz, | |
471 | char **buf_free_r) { | |
472 | size_t req; | |
473 | char *p; | |
474 | unsigned c, y; | |
475 | unsigned long aa; | |
476 | const unsigned char *ap; | |
477 | int i, j; | |
478 | ||
e0fc85c4 IJ |
479 | AF_IN_IN6_OTHER(sa->sa_family, { |
480 | req= 4 * 4; | |
481 | if (!zone) zone= "in-addr.arpa"; | |
482 | }, { | |
483 | req = 2 * 32; | |
484 | if (!zone) zone= "ip6.arpa"; | |
485 | }, { | |
486 | return ENOSYS; | |
487 | }); | |
51cb3de3 MW |
488 | |
489 | req += strlen(zone) + 1; | |
490 | if (req <= bufsz) | |
491 | p= *buf_io; | |
492 | else { | |
493 | p= malloc(req); if (!p) return errno; | |
494 | *buf_free_r = p; | |
495 | } | |
496 | ||
497 | *buf_io= p; | |
e0fc85c4 IJ |
498 | SOCKADDR_IN_IN6(const, sa, sin, { |
499 | aa= ntohl(sin->sin_addr.s_addr); | |
500 | for (i=0; i<4; i++) { | |
501 | p += sprintf(p, "%d", (int)(aa & 0xff)); | |
51cb3de3 | 502 | *p++= '.'; |
e0fc85c4 | 503 | aa >>= 8; |
51cb3de3 | 504 | } |
e0fc85c4 IJ |
505 | }, { |
506 | ap= sin6->sin6_addr.s6_addr + 16; | |
507 | for (i=0; i<16; i++) { | |
508 | c= *--ap; | |
509 | for (j=0; j<2; j++) { | |
510 | y= c & 0xf; | |
511 | *p++= (y < 10) ? y + '0' : y - 10 + 'a'; | |
512 | c >>= 4; | |
513 | *p++= '.'; | |
514 | } | |
515 | } | |
516 | }); | |
51cb3de3 MW |
517 | |
518 | strcpy(p, zone); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | ||
c0af047b IJ |
523 | #define REVPARSE_P_L(labnum) \ |
524 | const char *p= dgram + rps->labstart[labnum]; \ | |
525 | int l= rps->lablen[labnum] | |
526 | /* | |
527 | * REVPARSE_P_L(int labnum); | |
528 | * expects: | |
529 | * const char *dgram; | |
530 | * const struct revparse_state *rps; | |
531 | * produces: | |
532 | * const char *p; // start of label labnum in dgram | |
533 | * int l; // length of label in dgram | |
534 | */ | |
535 | ||
536 | static bool revparse_check_tail(struct revparse_state *rps, | |
537 | const char *dgram, int nlabels, | |
538 | int bodylen, const char *inarpa) { | |
539 | int i; | |
51cb3de3 | 540 | |
c0af047b IJ |
541 | if (nlabels != bodylen+2) return 0; |
542 | for (i=0; i<2; i++) { | |
543 | REVPARSE_P_L(bodylen+i); | |
544 | const char *want= !i ? inarpa : "arpa"; | |
545 | if (!adns__labels_equal(p,l, want,strlen(want))) return 0; | |
51cb3de3 | 546 | } |
c0af047b | 547 | return 1; |
51cb3de3 MW |
548 | } |
549 | ||
c0af047b IJ |
550 | static bool revparse_atoi(const char *p, int l, int base, |
551 | unsigned max, unsigned *v_r) { | |
552 | if (l>3) return 0; | |
553 | if (l>1 && p[0]=='0') return 0; | |
554 | unsigned v=0; | |
555 | while (l-- > 0) { | |
556 | int tv; | |
557 | int c= ctype_toupper(*p++); | |
558 | if ('0'<=c && c<='9') tv = c-'0'; | |
559 | else if ('A'<=c && c<='Z') tv = c-'A'+10; | |
560 | else return 0; | |
561 | if (tv >= base) return 0; | |
562 | v *= base; | |
563 | v += tv; | |
564 | } | |
565 | if (v>max) return 0; | |
566 | *v_r= v; | |
567 | return 1; | |
51cb3de3 MW |
568 | } |
569 | ||
c0af047b IJ |
570 | static bool revparse_inet(struct revparse_state *rps, |
571 | const char *dgram, int nlabels, | |
572 | adns_rrtype *rrtype_r, adns_sockaddr *addr_r) { | |
573 | if (!revparse_check_tail(rps,dgram,nlabels,4,"in-addr")) return 0; | |
51cb3de3 | 574 | |
c0af047b | 575 | uint32_t a=0; |
51cb3de3 | 576 | int i; |
c0af047b IJ |
577 | for (i=3; i>=0; i--) { |
578 | REVPARSE_P_L(i); | |
579 | unsigned v; | |
580 | if (!revparse_atoi(p,l,10,255,&v)) return 0; | |
581 | a <<= 8; | |
582 | a |= v; | |
583 | } | |
584 | *rrtype_r= adns_r_a; | |
585 | addr_r->inet.sin_family= AF_INET; | |
586 | addr_r->inet.sin_addr.s_addr= htonl(a); | |
587 | return 1; | |
51cb3de3 MW |
588 | } |
589 | ||
c0af047b IJ |
590 | static bool revparse_inet6(struct revparse_state *rps, |
591 | const char *dgram, int nlabels, | |
592 | adns_rrtype *rrtype_r, adns_sockaddr *addr_r) { | |
593 | if (!revparse_check_tail(rps,dgram,nlabels,32,"ip6")) return 0; | |
51cb3de3 | 594 | |
c0af047b IJ |
595 | int i, j; |
596 | memset(addr_r,0,sizeof(*addr_r)); | |
597 | unsigned char *a= addr_r->inet6.sin6_addr.s6_addr+16; | |
598 | for (i=0; i<32; ) { /* i incremented in inner loop */ | |
599 | unsigned b=0; | |
600 | for (j=0; j<2; j++, i++) { | |
601 | REVPARSE_P_L(i); | |
602 | unsigned v; | |
603 | if (!revparse_atoi(p,l,16,15,&v)) return 0; | |
604 | b >>= 4; | |
605 | b |= v << 4; | |
606 | } | |
607 | *--a= b; | |
608 | } | |
609 | *rrtype_r= adns_r_aaaa; | |
610 | addr_r->inet.sin_family= AF_INET6; | |
611 | return 1; | |
612 | } | |
51cb3de3 | 613 | |
e9fe1bdb IJ |
614 | bool adns__revparse_label(struct revparse_state *rps, int labnum, |
615 | const char *dgram, int labstart, int lablen) { | |
c0af047b IJ |
616 | if (labnum >= MAXREVLABELS) |
617 | return 0; | |
51cb3de3 | 618 | |
c0af047b IJ |
619 | assert(labstart <= 65535); |
620 | assert(lablen <= 255); | |
621 | rps->labstart[labnum] = labstart; | |
622 | rps->lablen[labnum] = lablen; | |
e9fe1bdb | 623 | return 1; |
51cb3de3 MW |
624 | } |
625 | ||
e9fe1bdb IJ |
626 | bool adns__revparse_done(struct revparse_state *rps, |
627 | const char *dgram, int nlabels, | |
628 | adns_rrtype *rrtype_r, adns_sockaddr *addr_r) { | |
c0af047b IJ |
629 | return |
630 | revparse_inet(rps,dgram,nlabels,rrtype_r,addr_r) || | |
631 | revparse_inet6(rps,dgram,nlabels,rrtype_r,addr_r); | |
51cb3de3 | 632 | } |