1 /**
2 * str2wire.c - read txt presentation of RRs
3 *
4 * (c) NLnet Labs, 2005-2006
5 *
6 * See the file LICENSE for the license
7 */
8
9 /**
10 * \file
11 *
12 * Parses text to wireformat.
13 */
14 #include "config.h"
15 #include "sldns/str2wire.h"
16 #include "sldns/wire2str.h"
17 #include "sldns/sbuffer.h"
18 #include "sldns/parse.h"
19 #include "sldns/parseutil.h"
20 #include <ctype.h>
21 #ifdef HAVE_TIME_H
22 #include <time.h>
23 #endif
24 #ifdef HAVE_NETDB_H
25 #include <netdb.h>
26 #endif
27
28 /** bits for the offset */
29 #define RET_OFFSET_MASK (((unsigned)(~LDNS_WIREPARSE_MASK))>>LDNS_WIREPARSE_SHIFT)
30 /** return an error */
31 #define RET_ERR(e, off) ((int)(((e)&LDNS_WIREPARSE_MASK)|(((off)&RET_OFFSET_MASK)<<LDNS_WIREPARSE_SHIFT)))
32 /** Move parse error but keep its ID */
33 #define RET_ERR_SHIFT(e, move) RET_ERR(LDNS_WIREPARSE_ERROR(e), LDNS_WIREPARSE_OFFSET(e)+(move));
34
35 /*
36 * No special care is taken, all dots are translated into
37 * label separators.
38 * @param rel: true if the domain is not absolute (not terminated in .).
39 * The output is then still terminated with a '0' rootlabel.
40 */
sldns_str2wire_dname_buf_rel(const char * str,uint8_t * buf,size_t * olen,int * rel)41 static int sldns_str2wire_dname_buf_rel(const char* str, uint8_t* buf,
42 size_t* olen, int* rel)
43 {
44 size_t len;
45
46 const char *s;
47 uint8_t *q, *pq, label_len;
48
49 if(rel) *rel = 0;
50 len = strlen((char*)str);
51 /* octet representation can make strings a lot longer than actual length */
52 if (len > LDNS_MAX_DOMAINLEN * 4) {
53 return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, 0);
54 }
55 if (0 == len) {
56 return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, 0);
57 }
58
59 /* root label */
60 if (1 == len && *str == '.') {
61 if(*olen < 1)
62 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, 0);
63 buf[0] = 0;
64 *olen = 1;
65 return LDNS_WIREPARSE_ERR_OK;
66 }
67
68 /* get on with the rest */
69
70 /* s is on the current character in the string
71 * pq points to where the labellength is going to go
72 * label_len keeps track of the current label's length
73 * q builds the dname inside the buf array
74 */
75 len = 0;
76 if(*olen < 1)
77 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, 0);
78 q = buf+1;
79 pq = buf;
80 label_len = 0;
81 for (s = str; *s; s++, q++) {
82 if (q >= buf + *olen)
83 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
84 if (q >= buf + LDNS_MAX_DOMAINLEN)
85 return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
86 switch (*s) {
87 case '.':
88 if (label_len > LDNS_MAX_LABELLEN) {
89 return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
90 }
91 if (label_len == 0) {
92 return RET_ERR(LDNS_WIREPARSE_ERR_EMPTY_LABEL, q-buf);
93 }
94 len += label_len + 1;
95 *q = 0;
96 *pq = label_len;
97 label_len = 0;
98 pq = q;
99 break;
100 case '\\':
101 /* octet value or literal char */
102 s += 1;
103 if (!sldns_parse_escape(q, &s)) {
104 *q = 0;
105 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE, q-buf);
106 }
107 s -= 1;
108 label_len++;
109 break;
110 default:
111 *q = (uint8_t)*s;
112 label_len++;
113 }
114 }
115
116 /* add root label if last char was not '.' */
117 if(label_len != 0) {
118 if(rel) *rel = 1;
119 if (q >= buf + *olen)
120 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
121 if (q >= buf + LDNS_MAX_DOMAINLEN) {
122 return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
123 }
124 if (label_len > LDNS_MAX_LABELLEN) {
125 return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
126 }
127 if (label_len == 0) { /* label_len 0 but not . at end? */
128 return RET_ERR(LDNS_WIREPARSE_ERR_EMPTY_LABEL, q-buf);
129 }
130 len += label_len + 1;
131 *pq = label_len;
132 *q = 0;
133 }
134 len++;
135 *olen = len;
136
137 return LDNS_WIREPARSE_ERR_OK;
138 }
139
sldns_str2wire_dname_buf(const char * str,uint8_t * buf,size_t * len)140 int sldns_str2wire_dname_buf(const char* str, uint8_t* buf, size_t* len)
141 {
142 return sldns_str2wire_dname_buf_rel(str, buf, len, NULL);
143 }
144
sldns_str2wire_dname_buf_origin(const char * str,uint8_t * buf,size_t * len,uint8_t * origin,size_t origin_len)145 int sldns_str2wire_dname_buf_origin(const char* str, uint8_t* buf, size_t* len,
146 uint8_t* origin, size_t origin_len)
147 {
148 size_t dlen = *len;
149 int rel = 0;
150 int s = sldns_str2wire_dname_buf_rel(str, buf, &dlen, &rel);
151 if(s) return s;
152
153 if(rel && origin && dlen > 0) {
154 if((unsigned)dlen >= 0x00ffffffU ||
155 (unsigned)origin_len >= 0x00ffffffU)
156 /* guard against integer overflow in addition */
157 return RET_ERR(LDNS_WIREPARSE_ERR_GENERAL, *len);
158 if(dlen + origin_len - 1 > LDNS_MAX_DOMAINLEN)
159 return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW,
160 LDNS_MAX_DOMAINLEN);
161 if(dlen + origin_len - 1 > *len)
162 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
163 *len);
164 memmove(buf+dlen-1, origin, origin_len);
165 *len = dlen + origin_len - 1;
166 } else
167 *len = dlen;
168 return LDNS_WIREPARSE_ERR_OK;
169 }
170
sldns_str2wire_dname(const char * str,size_t * len)171 uint8_t* sldns_str2wire_dname(const char* str, size_t* len)
172 {
173 uint8_t dname[LDNS_MAX_DOMAINLEN+1];
174 *len = sizeof(dname);
175 if(sldns_str2wire_dname_buf(str, dname, len) == 0) {
176 uint8_t* r;
177 if(*len > sizeof(dname)) return NULL;
178 r = (uint8_t*)malloc(*len);
179 if(r) return memcpy(r, dname, *len);
180 }
181 *len = 0;
182 return NULL;
183 }
184
185 /** read owner name */
186 static int
rrinternal_get_owner(sldns_buffer * strbuf,uint8_t * rr,size_t * len,size_t * dname_len,uint8_t * origin,size_t origin_len,uint8_t * prev,size_t prev_len,char * token,size_t token_len)187 rrinternal_get_owner(sldns_buffer* strbuf, uint8_t* rr, size_t* len,
188 size_t* dname_len, uint8_t* origin, size_t origin_len, uint8_t* prev,
189 size_t prev_len, char* token, size_t token_len)
190 {
191 /* split the rr in its parts -1 signals trouble */
192 if(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
193 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
194 sldns_buffer_position(strbuf));
195 }
196
197 if(token_len < 2) /* make sure there is space to read "@" or "" */
198 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
199 sldns_buffer_position(strbuf));
200 if(token[0]=='@' && token[1]=='\0') {
201 uint8_t* tocopy;
202 if (origin) {
203 *dname_len = origin_len;
204 tocopy = origin;
205 } else if (prev) {
206 *dname_len = prev_len;
207 tocopy = prev;
208 } else {
209 /* default to root */
210 *dname_len = 1;
211 tocopy = (uint8_t*)"\0";
212 }
213 if(*len < *dname_len)
214 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
215 sldns_buffer_position(strbuf));
216 memmove(rr, tocopy, *dname_len);
217 } else if(*token == '\0') {
218 /* no ownername was given, try prev, if that fails
219 * origin, else default to root */
220 uint8_t* tocopy;
221 if(prev) {
222 *dname_len = prev_len;
223 tocopy = prev;
224 } else if(origin) {
225 *dname_len = origin_len;
226 tocopy = origin;
227 } else {
228 *dname_len = 1;
229 tocopy = (uint8_t*)"\0";
230 }
231 if(*len < *dname_len)
232 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
233 sldns_buffer_position(strbuf));
234 memmove(rr, tocopy, *dname_len);
235 } else {
236 size_t dlen = *len;
237 int s = sldns_str2wire_dname_buf_origin(token, rr, &dlen,
238 origin, origin_len);
239 if(s) return RET_ERR_SHIFT(s,
240 sldns_buffer_position(strbuf)-strlen(token));
241 *dname_len = dlen;
242 }
243 return LDNS_WIREPARSE_ERR_OK;
244 }
245
246 /** read ttl */
247 static int
rrinternal_get_ttl(sldns_buffer * strbuf,char * token,size_t token_len,int * not_there,uint32_t * ttl,uint32_t default_ttl)248 rrinternal_get_ttl(sldns_buffer* strbuf, char* token, size_t token_len,
249 int* not_there, uint32_t* ttl, uint32_t default_ttl)
250 {
251 const char* endptr;
252 int overflow;
253 if(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
254 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TTL,
255 sldns_buffer_position(strbuf));
256 }
257 *ttl = (uint32_t) sldns_str2period(token, &endptr, &overflow);
258 if(overflow) {
259 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW,
260 sldns_buffer_position(strbuf));
261 }
262
263 if (strlen(token) > 0 && !isdigit((unsigned char)token[0])) {
264 *not_there = 1;
265 /* ah, it's not there or something */
266 if (default_ttl == 0) {
267 *ttl = LDNS_DEFAULT_TTL;
268 } else {
269 *ttl = default_ttl;
270 }
271 }
272 return LDNS_WIREPARSE_ERR_OK;
273 }
274
275 /** read class */
276 static int
rrinternal_get_class(sldns_buffer * strbuf,char * token,size_t token_len,int * not_there,uint16_t * cl)277 rrinternal_get_class(sldns_buffer* strbuf, char* token, size_t token_len,
278 int* not_there, uint16_t* cl)
279 {
280 /* if 'not_there' then we got token from previous parse routine */
281 if(!*not_there) {
282 /* parse new token for class */
283 if(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
284 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_CLASS,
285 sldns_buffer_position(strbuf));
286 }
287 } else *not_there = 0;
288 *cl = sldns_get_rr_class_by_name(token);
289 /* class can be left out too, assume IN, current token must be type */
290 if(*cl == 0 && strcmp(token, "CLASS0") != 0) {
291 *not_there = 1;
292 *cl = LDNS_RR_CLASS_IN;
293 }
294 return LDNS_WIREPARSE_ERR_OK;
295 }
296
297 /** read type */
298 static int
rrinternal_get_type(sldns_buffer * strbuf,char * token,size_t token_len,int * not_there,uint16_t * tp)299 rrinternal_get_type(sldns_buffer* strbuf, char* token, size_t token_len,
300 int* not_there, uint16_t* tp)
301 {
302 /* if 'not_there' then we got token from previous parse routine */
303 if(!*not_there) {
304 /* parse new token for type */
305 if(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
306 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
307 sldns_buffer_position(strbuf));
308 }
309 }
310 *tp = sldns_get_rr_type_by_name(token);
311 if(*tp == 0 && strcmp(token, "TYPE0") != 0) {
312 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
313 sldns_buffer_position(strbuf));
314 }
315 return LDNS_WIREPARSE_ERR_OK;
316 }
317
318 /** put type, class, ttl into rr buffer */
319 static int
rrinternal_write_typeclassttl(sldns_buffer * strbuf,uint8_t * rr,size_t len,size_t dname_len,uint16_t tp,uint16_t cl,uint32_t ttl,int question)320 rrinternal_write_typeclassttl(sldns_buffer* strbuf, uint8_t* rr, size_t len,
321 size_t dname_len, uint16_t tp, uint16_t cl, uint32_t ttl, int question)
322 {
323 if(question) {
324 /* question is : name, type, class */
325 if(dname_len + 4 > len)
326 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
327 sldns_buffer_position(strbuf));
328 sldns_write_uint16(rr+dname_len, tp);
329 sldns_write_uint16(rr+dname_len+2, cl);
330 return LDNS_WIREPARSE_ERR_OK;
331 }
332
333 /* type(2), class(2), ttl(4), rdatalen(2 (later)) = 10 */
334 if(dname_len + 10 > len)
335 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
336 sldns_buffer_position(strbuf));
337 sldns_write_uint16(rr+dname_len, tp);
338 sldns_write_uint16(rr+dname_len+2, cl);
339 sldns_write_uint32(rr+dname_len+4, ttl);
340 sldns_write_uint16(rr+dname_len+8, 0); /* rdatalen placeholder */
341 return LDNS_WIREPARSE_ERR_OK;
342 }
343
344 /** find delimiters for type */
345 static const char*
rrinternal_get_delims(sldns_rdf_type rdftype,size_t r_cnt,size_t r_max)346 rrinternal_get_delims(sldns_rdf_type rdftype, size_t r_cnt, size_t r_max)
347 {
348 switch(rdftype) {
349 case LDNS_RDF_TYPE_B64 :
350 case LDNS_RDF_TYPE_HEX : /* These rdf types may con- */
351 case LDNS_RDF_TYPE_LOC : /* tain whitespace, only if */
352 case LDNS_RDF_TYPE_WKS : /* it is the last rd field. */
353 case LDNS_RDF_TYPE_IPSECKEY :
354 case LDNS_RDF_TYPE_NSEC : if (r_cnt == r_max - 1) {
355 return "\n";
356 }
357 break;
358 default : break;
359 }
360 return "\n\t ";
361 }
362
363 /* Syntactic sugar for sldns_rr_new_frm_str_internal */
364 static int
sldns_rdf_type_maybe_quoted(sldns_rdf_type rdf_type)365 sldns_rdf_type_maybe_quoted(sldns_rdf_type rdf_type)
366 {
367 return rdf_type == LDNS_RDF_TYPE_STR ||
368 rdf_type == LDNS_RDF_TYPE_LONG_STR;
369 }
370
371 /** see if rdata is quoted */
372 static int
rrinternal_get_quoted(sldns_buffer * strbuf,const char ** delimiters,sldns_rdf_type rdftype)373 rrinternal_get_quoted(sldns_buffer* strbuf, const char** delimiters,
374 sldns_rdf_type rdftype)
375 {
376 if(sldns_rdf_type_maybe_quoted(rdftype) &&
377 sldns_buffer_remaining(strbuf) > 0) {
378
379 /* skip spaces */
380 while(sldns_buffer_remaining(strbuf) > 0 &&
381 (*(sldns_buffer_current(strbuf)) == ' ' ||
382 *(sldns_buffer_current(strbuf)) == '\t')) {
383 sldns_buffer_skip(strbuf, 1);
384 }
385
386 if(sldns_buffer_remaining(strbuf) > 0 &&
387 *(sldns_buffer_current(strbuf)) == '\"') {
388 *delimiters = "\"\0";
389 sldns_buffer_skip(strbuf, 1);
390 return 1;
391 }
392 }
393 return 0;
394 }
395
396 /** spool hex data into rdata */
397 static int
rrinternal_spool_hex(char * token,uint8_t * rr,size_t rr_len,size_t rr_cur_len,size_t * cur_hex_data_size,size_t hex_data_size)398 rrinternal_spool_hex(char* token, uint8_t* rr, size_t rr_len,
399 size_t rr_cur_len, size_t* cur_hex_data_size, size_t hex_data_size)
400 {
401 char* p = token;
402 while(*p) {
403 if(isspace((unsigned char)*p)) {
404 p++;
405 continue;
406 }
407 if(!isxdigit((unsigned char)*p))
408 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
409 p-token);
410 if(*cur_hex_data_size >= hex_data_size)
411 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
412 p-token);
413 /* extra robust check */
414 if(rr_cur_len+(*cur_hex_data_size)/2 >= rr_len)
415 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
416 p-token);
417 /* see if 16s or 1s */
418 if( ((*cur_hex_data_size)&1) == 0) {
419 rr[rr_cur_len+(*cur_hex_data_size)/2] =
420 (uint8_t)sldns_hexdigit_to_int(*p)*16;
421 } else {
422 rr[rr_cur_len+(*cur_hex_data_size)/2] +=
423 (uint8_t)sldns_hexdigit_to_int(*p);
424 }
425 p++;
426 (*cur_hex_data_size)++;
427 }
428 return LDNS_WIREPARSE_ERR_OK;
429 }
430
431 /** read unknown rr type format */
432 static int
rrinternal_parse_unknown(sldns_buffer * strbuf,char * token,size_t token_len,uint8_t * rr,size_t * rr_len,size_t * rr_cur_len,size_t pre_data_pos)433 rrinternal_parse_unknown(sldns_buffer* strbuf, char* token, size_t token_len,
434 uint8_t* rr, size_t* rr_len, size_t* rr_cur_len, size_t pre_data_pos)
435 {
436 const char* delim = "\n\t ";
437 size_t hex_data_size, cur_hex_data_size;
438 /* go back to before \#
439 * and skip it while setting delimiters better
440 */
441 sldns_buffer_set_position(strbuf, pre_data_pos);
442 if(sldns_bget_token(strbuf, token, delim, token_len) == -1)
443 return LDNS_WIREPARSE_ERR_GENERAL; /* should not fail */
444 /* read rdata octet length */
445 if(sldns_bget_token(strbuf, token, delim, token_len) == -1) {
446 /* something goes very wrong here */
447 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
448 sldns_buffer_position(strbuf));
449 }
450 hex_data_size = (size_t)atoi(token);
451 if(hex_data_size > LDNS_MAX_RDFLEN ||
452 *rr_cur_len + hex_data_size > *rr_len) {
453 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
454 sldns_buffer_position(strbuf));
455 }
456 /* copy hex chars into hex str (2 chars per byte) */
457 hex_data_size *= 2;
458 cur_hex_data_size = 0;
459 while(cur_hex_data_size < hex_data_size) {
460 int status;
461 ssize_t c = sldns_bget_token(strbuf, token, delim, token_len);
462 if((status = rrinternal_spool_hex(token, rr, *rr_len,
463 *rr_cur_len, &cur_hex_data_size, hex_data_size)) != 0)
464 return RET_ERR_SHIFT(status,
465 sldns_buffer_position(strbuf)-strlen(token));
466 if(c == -1) {
467 if(cur_hex_data_size != hex_data_size)
468 return RET_ERR(
469 LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
470 sldns_buffer_position(strbuf));
471 break;
472 }
473 }
474 *rr_cur_len += hex_data_size/2;
475 return LDNS_WIREPARSE_ERR_OK;
476 }
477
478 /** parse normal RR rdata element */
479 static int
rrinternal_parse_rdf(sldns_buffer * strbuf,char * token,size_t token_len,uint8_t * rr,size_t rr_len,size_t * rr_cur_len,sldns_rdf_type rdftype,uint16_t rr_type,size_t r_cnt,size_t r_max,size_t dname_len,uint8_t * origin,size_t origin_len)480 rrinternal_parse_rdf(sldns_buffer* strbuf, char* token, size_t token_len,
481 uint8_t* rr, size_t rr_len, size_t* rr_cur_len, sldns_rdf_type rdftype,
482 uint16_t rr_type, size_t r_cnt, size_t r_max, size_t dname_len,
483 uint8_t* origin, size_t origin_len)
484 {
485 size_t len;
486 int status;
487
488 switch(rdftype) {
489 case LDNS_RDF_TYPE_DNAME:
490 /* check if the origin should be used or concatenated */
491 if(strcmp(token, "@") == 0) {
492 uint8_t* tocopy;
493 size_t copylen;
494 if(origin) {
495 copylen = origin_len;
496 tocopy = origin;
497 } else if(rr_type == LDNS_RR_TYPE_SOA) {
498 copylen = dname_len;
499 tocopy = rr; /* copy rr owner name */
500 } else {
501 copylen = 1;
502 tocopy = (uint8_t*)"\0";
503 }
504 if((*rr_cur_len) + copylen > rr_len)
505 return RET_ERR(
506 LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
507 sldns_buffer_position(strbuf));
508 memmove(rr+*rr_cur_len, tocopy, copylen);
509 (*rr_cur_len) += copylen;
510 } else {
511 size_t dlen = rr_len - (*rr_cur_len);
512 int s = sldns_str2wire_dname_buf_origin(token,
513 rr+*rr_cur_len, &dlen, origin, origin_len);
514 if(s) return RET_ERR_SHIFT(s,
515 sldns_buffer_position(strbuf)-strlen(token));
516 (*rr_cur_len) += dlen;
517 }
518 return LDNS_WIREPARSE_ERR_OK;
519
520 case LDNS_RDF_TYPE_HEX:
521 case LDNS_RDF_TYPE_B64:
522 /* When this is the last rdata field, then the
523 * rest should be read in (cause then these
524 * rdf types may contain spaces). */
525 if(r_cnt == r_max - 1) {
526 size_t tlen = strlen(token);
527 (void)sldns_bget_token(strbuf, token+tlen, "\n",
528 token_len - tlen);
529 }
530 break;
531 default:
532 break;
533 }
534
535 len = rr_len - (*rr_cur_len);
536 if((status=sldns_str2wire_rdf_buf(token, rr+(*rr_cur_len), &len,
537 rdftype)) != 0)
538 return RET_ERR_SHIFT(status,
539 sldns_buffer_position(strbuf)-strlen(token));
540 *rr_cur_len += len;
541 return LDNS_WIREPARSE_ERR_OK;
542 }
543
544 /**
545 * Parse one rdf token. Takes care of quotes and parenthesis.
546 */
547 static int
sldns_parse_rdf_token(sldns_buffer * strbuf,char * token,size_t token_len,int * quoted,int * parens,size_t * pre_data_pos,const char * delimiters,sldns_rdf_type rdftype,size_t * token_strlen)548 sldns_parse_rdf_token(sldns_buffer* strbuf, char* token, size_t token_len,
549 int* quoted, int* parens, size_t* pre_data_pos,
550 const char* delimiters, sldns_rdf_type rdftype, size_t* token_strlen)
551 {
552 size_t slen;
553
554 /* skip spaces and tabs */
555 while(sldns_buffer_remaining(strbuf) > 0 && !*quoted &&
556 (*(sldns_buffer_current(strbuf)) == ' ' ||
557 *(sldns_buffer_current(strbuf)) == '\t')) {
558 sldns_buffer_skip(strbuf, 1);
559 }
560
561 *pre_data_pos = sldns_buffer_position(strbuf);
562 if(sldns_bget_token_par(strbuf, token, (*quoted)?"\"":delimiters,
563 token_len, parens, (*quoted)?NULL:" \t") == -1) {
564 return 0;
565 }
566 slen = strlen(token);
567 /* check if not quoted yet, and we have encountered quotes */
568 if(!*quoted && sldns_rdf_type_maybe_quoted(rdftype) &&
569 slen >= 2 &&
570 (token[0] == '"' || token[0] == '\'') &&
571 (token[slen-1] == '"' || token[slen-1] == '\'')) {
572 /* move token two smaller (quotes) with endnull */
573 memmove(token, token+1, slen-2);
574 token[slen-2] = 0;
575 slen -= 2;
576 *quoted = 1;
577 } else if(!*quoted && sldns_rdf_type_maybe_quoted(rdftype) &&
578 slen >= 2 &&
579 (token[0] == '"' || token[0] == '\'')) {
580 /* got the start quote (remove it) but read remainder
581 * of quoted string as well into remainder of token */
582 memmove(token, token+1, slen-1);
583 token[slen-1] = 0;
584 slen -= 1;
585 *quoted = 1;
586 /* rewind buffer over skipped whitespace */
587 while(sldns_buffer_position(strbuf) > 0 &&
588 (sldns_buffer_current(strbuf)[-1] == ' ' ||
589 sldns_buffer_current(strbuf)[-1] == '\t')) {
590 sldns_buffer_skip(strbuf, -1);
591 }
592 if(sldns_bget_token_par(strbuf, token+slen,
593 "\"", token_len-slen,
594 parens, NULL) == -1) {
595 return 0;
596 }
597 slen = strlen(token);
598 }
599 *token_strlen = slen;
600 return 1;
601 }
602
603 /** Add space and one more rdf token onto the existing token string. */
604 static int
sldns_affix_token(sldns_buffer * strbuf,char * token,size_t * token_len,int * quoted,int * parens,size_t * pre_data_pos,const char * delimiters,sldns_rdf_type rdftype,size_t * token_strlen)605 sldns_affix_token(sldns_buffer* strbuf, char* token, size_t* token_len,
606 int* quoted, int* parens, size_t* pre_data_pos,
607 const char* delimiters, sldns_rdf_type rdftype, size_t* token_strlen)
608 {
609 size_t addlen = *token_len - *token_strlen;
610 size_t addstrlen = 0;
611
612 /* add space */
613 /* when addlen < 2, the token buffer is full considering the NULL byte
614 * from strlen and will lead to buffer overflow with the second
615 * assignment below. */
616 if(addlen < 2) return 0;
617 token[*token_strlen] = ' ';
618 token[++(*token_strlen)] = 0;
619
620 /* read another token */
621 addlen = *token_len - *token_strlen;
622 if(!sldns_parse_rdf_token(strbuf, token+*token_strlen, addlen, quoted,
623 parens, pre_data_pos, delimiters, rdftype, &addstrlen))
624 return 0;
625 (*token_strlen) += addstrlen;
626 return 1;
627 }
628
sldns_str2wire_svcparam_key_cmp(const void * a,const void * b)629 static int sldns_str2wire_svcparam_key_cmp(const void *a, const void *b)
630 {
631 return sldns_read_uint16(*(uint8_t**) a)
632 - sldns_read_uint16(*(uint8_t**) b);
633 }
634
635 /**
636 * Add constraints to the SVCB RRs which involve the whole set
637 */
sldns_str2wire_check_svcbparams(uint8_t * rdata,uint16_t rdata_len)638 static int sldns_str2wire_check_svcbparams(uint8_t* rdata, uint16_t rdata_len)
639 {
640 size_t nparams = 0, i;
641 uint8_t new_rdata[LDNS_MAX_RDFLEN];
642 uint8_t* new_rdata_ptr = new_rdata;
643 uint8_t* svcparams[MAX_NUMBER_OF_SVCPARAMS];
644 uint8_t* rdata_ptr = rdata;
645 uint16_t rdata_remaining = rdata_len;
646
647 /* find the SvcParams */
648 while (rdata_remaining) {
649 uint16_t svcbparam_len;
650
651 svcparams[nparams] = rdata_ptr;
652 if (rdata_remaining < 4)
653 return LDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
654 svcbparam_len = sldns_read_uint16(rdata_ptr + 2);
655 rdata_remaining -= 4;
656 rdata_ptr += 4;
657
658 if (rdata_remaining < svcbparam_len)
659 return LDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
660 rdata_remaining -= svcbparam_len;
661 rdata_ptr += svcbparam_len;
662
663 nparams += 1;
664 if (nparams >= MAX_NUMBER_OF_SVCPARAMS)
665 return LDNS_WIREPARSE_ERR_SVCB_TOO_MANY_PARAMS;
666 }
667
668 /* In draft-ietf-dnsop-svcb-https-06 Section 7:
669 *
670 * In wire format, the keys are represented by their numeric
671 * values in network byte order, concatenated in ascending order.
672 */
673 qsort((void *)svcparams
674 ,nparams
675 ,sizeof(uint8_t*)
676 ,sldns_str2wire_svcparam_key_cmp);
677
678
679 /* The code below revolves around semantic errors in the SVCParam set.
680 * So long as we do not distinguish between running Unbound as a primary
681 * or as a secondary, we default to secondary behavior and we ignore the
682 * semantic errors. */
683
684 #ifdef SVCB_SEMANTIC_ERRORS
685 {
686 uint8_t* mandatory = NULL;
687 /* In draft-ietf-dnsop-svcb-https-06 Section 7:
688 *
689 * Keys (...) MUST NOT appear more than once.
690 *
691 * If they key has already been seen, we have a duplicate
692 */
693 for(i=0; i < nparams; i++) {
694 uint16_t key = sldns_read_uint16(svcparams[i]);
695 if(i + 1 < nparams && key == sldns_read_uint16(svcparams[i+1]))
696 return LDNS_WIREPARSE_ERR_SVCB_DUPLICATE_KEYS;
697 if(key == SVCB_KEY_MANDATORY)
698 mandatory = svcparams[i];
699 }
700
701 /* 4. verify that all the SvcParamKeys in mandatory are present */
702 if(mandatory) {
703 /* Divide by sizeof(uint16_t)*/
704 uint16_t mandatory_nkeys = sldns_read_uint16(mandatory + 2) / sizeof(uint16_t);
705
706 /* Guaranteed by sldns_str2wire_svcparam_key_value */
707 assert(mandatory_nkeys > 0);
708
709 for(i=0; i < mandatory_nkeys; i++) {
710 uint16_t mandatory_key = sldns_read_uint16(
711 mandatory
712 + 2 * sizeof(uint16_t)
713 + i * sizeof(uint16_t));
714 uint8_t found = 0;
715 size_t j;
716
717 for(j=0; j < nparams; j++) {
718 if(mandatory_key == sldns_read_uint16(svcparams[j])) {
719 found = 1;
720 break;
721 }
722 }
723
724 if(!found)
725 return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_MISSING_PARAM;
726 }
727 }
728 }
729 #endif
730 /* Write rdata in correct order */
731 for (i = 0; i < nparams; i++) {
732 uint16_t svcparam_len = sldns_read_uint16(svcparams[i] + 2)
733 + 2 * sizeof(uint16_t);
734
735 if ((unsigned)(new_rdata_ptr - new_rdata) + svcparam_len > sizeof(new_rdata))
736 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
737
738 memcpy(new_rdata_ptr, svcparams[i], svcparam_len);
739 new_rdata_ptr += svcparam_len;
740 }
741 memcpy(rdata, new_rdata, rdata_len);
742 return LDNS_WIREPARSE_ERR_OK;
743 }
744
745 /** parse rdata from string into rr buffer(-remainder after dname). */
746 static int
rrinternal_parse_rdata(sldns_buffer * strbuf,char * token,size_t token_len,uint8_t * rr,size_t * rr_len,size_t dname_len,uint16_t rr_type,uint8_t * origin,size_t origin_len)747 rrinternal_parse_rdata(sldns_buffer* strbuf, char* token, size_t token_len,
748 uint8_t* rr, size_t* rr_len, size_t dname_len, uint16_t rr_type,
749 uint8_t* origin, size_t origin_len)
750 {
751 const sldns_rr_descriptor *desc = sldns_rr_descript((uint16_t)rr_type);
752 size_t r_cnt, r_min, r_max;
753 size_t rr_cur_len = dname_len + 10, pre_data_pos, token_strlen;
754 int was_unknown_rr_format = 0, parens = 0, status, quoted;
755 const char* delimiters;
756 sldns_rdf_type rdftype;
757 /* a desc is always returned */
758 if(!desc) return LDNS_WIREPARSE_ERR_GENERAL;
759 r_max = sldns_rr_descriptor_maximum(desc);
760 r_min = sldns_rr_descriptor_minimum(desc);
761 /* robust check */
762 if(rr_cur_len > *rr_len)
763 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
764 sldns_buffer_position(strbuf));
765
766 /* because number of fields can be variable, we can't rely on
767 * _maximum() only */
768 for(r_cnt=0; r_cnt < r_max; r_cnt++) {
769 rdftype = sldns_rr_descriptor_field_type(desc, r_cnt);
770 delimiters = rrinternal_get_delims(rdftype, r_cnt, r_max);
771 quoted = rrinternal_get_quoted(strbuf, &delimiters, rdftype);
772
773 if(!sldns_parse_rdf_token(strbuf, token, token_len, "ed,
774 &parens, &pre_data_pos, delimiters, rdftype,
775 &token_strlen))
776 break;
777
778 /* rfc3597 specifies that any type can be represented
779 * with \# method, which can contain spaces...
780 * it does specify size though... */
781
782 /* unknown RR data */
783 if(token_strlen>=2 && strncmp(token, "\\#", 2) == 0 &&
784 !quoted && (token_strlen == 2 || token[2]==' ' ||
785 token[2]=='\t')) {
786 was_unknown_rr_format = 1;
787 if((status=rrinternal_parse_unknown(strbuf, token,
788 token_len, rr, rr_len, &rr_cur_len,
789 pre_data_pos)) != 0)
790 return status;
791 } else if(token_strlen > 0 || quoted) {
792 if(rdftype == LDNS_RDF_TYPE_HIP) {
793 /* affix the HIT and PK fields, with a space */
794 if(!sldns_affix_token(strbuf, token,
795 &token_len, "ed, &parens,
796 &pre_data_pos, delimiters,
797 rdftype, &token_strlen))
798 break;
799 if(!sldns_affix_token(strbuf, token,
800 &token_len, "ed, &parens,
801 &pre_data_pos, delimiters,
802 rdftype, &token_strlen))
803 break;
804 } else if(rdftype == LDNS_RDF_TYPE_INT16_DATA &&
805 strcmp(token, "0")!=0) {
806 /* affix len and b64 fields */
807 if(!sldns_affix_token(strbuf, token,
808 &token_len, "ed, &parens,
809 &pre_data_pos, delimiters,
810 rdftype, &token_strlen))
811 break;
812 }
813
814 /* normal RR */
815 if((status=rrinternal_parse_rdf(strbuf, token,
816 token_len, rr, *rr_len, &rr_cur_len, rdftype,
817 rr_type, r_cnt, r_max, dname_len, origin,
818 origin_len)) != 0) {
819 return status;
820 }
821 }
822 }
823 if(!was_unknown_rr_format && r_cnt+1 < r_min) {
824 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE,
825 sldns_buffer_position(strbuf));
826 }
827 while(parens != 0) {
828 /* read remainder, must be "" */
829 if(sldns_bget_token_par(strbuf, token, "\n", token_len,
830 &parens, " \t") == -1) {
831 if(parens != 0)
832 return RET_ERR(LDNS_WIREPARSE_ERR_PARENTHESIS,
833 sldns_buffer_position(strbuf));
834 break;
835 }
836 if(strcmp(token, "") != 0)
837 return RET_ERR(LDNS_WIREPARSE_ERR_PARENTHESIS,
838 sldns_buffer_position(strbuf));
839 }
840 /* write rdata length */
841 sldns_write_uint16(rr+dname_len+8, (uint16_t)(rr_cur_len-dname_len-10));
842 *rr_len = rr_cur_len;
843 /* SVCB/HTTPS handling */
844 if (rr_type == LDNS_RR_TYPE_SVCB || rr_type == LDNS_RR_TYPE_HTTPS) {
845 size_t rdata_len = rr_cur_len - dname_len - 10;
846 uint8_t *rdata = rr+dname_len + 10;
847
848 /* skip 1st rdata field SvcPriority (uint16_t) */
849 if (rdata_len < sizeof(uint16_t))
850 return LDNS_WIREPARSE_ERR_OK;
851
852 rdata_len -= sizeof(uint16_t);
853 rdata += sizeof(uint16_t);
854
855 /* skip 2nd rdata field dname */
856 while (rdata_len && *rdata != 0) {
857 uint8_t label_len;
858
859 if (*rdata & 0xC0)
860 return LDNS_WIREPARSE_ERR_OK;
861
862 label_len = *rdata + 1;
863 if (rdata_len < label_len)
864 return LDNS_WIREPARSE_ERR_OK;
865
866 rdata_len -= label_len;
867 rdata += label_len;
868 }
869 /* The root label is one more character, so smaller
870 * than 1 + 1 means no Svcparam Keys */
871 if (rdata_len < 2 || *rdata != 0)
872 return LDNS_WIREPARSE_ERR_OK;
873
874 rdata_len -= 1;
875 rdata += 1;
876 return sldns_str2wire_check_svcbparams(rdata, rdata_len);
877
878 }
879 return LDNS_WIREPARSE_ERR_OK;
880 }
881
882 /*
883 * trailing spaces are allowed
884 * leading spaces are not allowed
885 * allow ttl to be optional
886 * class is optional too
887 * if ttl is missing, and default_ttl is 0, use DEF_TTL
888 * allow ttl to be written as 1d3h
889 * So the RR should look like. e.g.
890 * miek.nl. 3600 IN MX 10 elektron.atoom.net
891 * or
892 * miek.nl. 1h IN MX 10 elektron.atoom.net
893 * or
894 * miek.nl. IN MX 10 elektron.atoom.net
895 */
896 static int
sldns_str2wire_rr_buf_internal(const char * str,uint8_t * rr,size_t * len,size_t * dname_len,uint32_t default_ttl,uint8_t * origin,size_t origin_len,uint8_t * prev,size_t prev_len,int question)897 sldns_str2wire_rr_buf_internal(const char* str, uint8_t* rr, size_t* len,
898 size_t* dname_len, uint32_t default_ttl, uint8_t* origin,
899 size_t origin_len, uint8_t* prev, size_t prev_len, int question)
900 {
901 int status;
902 int not_there = 0;
903 char token[LDNS_MAX_RDFLEN+1];
904 uint32_t ttl = 0;
905 uint16_t tp = 0, cl = 0;
906 size_t ddlen = 0;
907
908 /* string in buffer */
909 sldns_buffer strbuf;
910 sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
911 if(!dname_len) dname_len = &ddlen;
912
913 /* parse the owner */
914 if((status=rrinternal_get_owner(&strbuf, rr, len, dname_len, origin,
915 origin_len, prev, prev_len, token, sizeof(token))) != 0)
916 return status;
917
918 /* parse the [ttl] [class] <type> */
919 if((status=rrinternal_get_ttl(&strbuf, token, sizeof(token),
920 ¬_there, &ttl, default_ttl)) != 0)
921 return status;
922 if((status=rrinternal_get_class(&strbuf, token, sizeof(token),
923 ¬_there, &cl)) != 0)
924 return status;
925 if((status=rrinternal_get_type(&strbuf, token, sizeof(token),
926 ¬_there, &tp)) != 0)
927 return status;
928 /* put ttl, class, type into the rr result */
929 if((status=rrinternal_write_typeclassttl(&strbuf, rr, *len, *dname_len, tp, cl,
930 ttl, question)) != 0)
931 return status;
932 /* for a question-RR we are done, no rdata */
933 if(question) {
934 *len = *dname_len + 4;
935 return LDNS_WIREPARSE_ERR_OK;
936 }
937
938 /* rdata */
939 if((status=rrinternal_parse_rdata(&strbuf, token, sizeof(token),
940 rr, len, *dname_len, tp, origin, origin_len)) != 0)
941 return status;
942
943 return LDNS_WIREPARSE_ERR_OK;
944 }
945
sldns_str2wire_rr_buf(const char * str,uint8_t * rr,size_t * len,size_t * dname_len,uint32_t default_ttl,uint8_t * origin,size_t origin_len,uint8_t * prev,size_t prev_len)946 int sldns_str2wire_rr_buf(const char* str, uint8_t* rr, size_t* len,
947 size_t* dname_len, uint32_t default_ttl, uint8_t* origin,
948 size_t origin_len, uint8_t* prev, size_t prev_len)
949 {
950 return sldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
951 default_ttl, origin, origin_len, prev, prev_len, 0);
952 }
953
sldns_str2wire_rr_question_buf(const char * str,uint8_t * rr,size_t * len,size_t * dname_len,uint8_t * origin,size_t origin_len,uint8_t * prev,size_t prev_len)954 int sldns_str2wire_rr_question_buf(const char* str, uint8_t* rr, size_t* len,
955 size_t* dname_len, uint8_t* origin, size_t origin_len, uint8_t* prev,
956 size_t prev_len)
957 {
958 return sldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
959 0, origin, origin_len, prev, prev_len, 1);
960 }
961
sldns_wirerr_get_type(uint8_t * rr,size_t len,size_t dname_len)962 uint16_t sldns_wirerr_get_type(uint8_t* rr, size_t len, size_t dname_len)
963 {
964 if(len < dname_len+2)
965 return 0;
966 return sldns_read_uint16(rr+dname_len);
967 }
968
sldns_wirerr_get_class(uint8_t * rr,size_t len,size_t dname_len)969 uint16_t sldns_wirerr_get_class(uint8_t* rr, size_t len, size_t dname_len)
970 {
971 if(len < dname_len+4)
972 return 0;
973 return sldns_read_uint16(rr+dname_len+2);
974 }
975
sldns_wirerr_get_ttl(uint8_t * rr,size_t len,size_t dname_len)976 uint32_t sldns_wirerr_get_ttl(uint8_t* rr, size_t len, size_t dname_len)
977 {
978 if(len < dname_len+8)
979 return 0;
980 return sldns_read_uint32(rr+dname_len+4);
981 }
982
sldns_wirerr_get_rdatalen(uint8_t * rr,size_t len,size_t dname_len)983 uint16_t sldns_wirerr_get_rdatalen(uint8_t* rr, size_t len, size_t dname_len)
984 {
985 if(len < dname_len+10)
986 return 0;
987 return sldns_read_uint16(rr+dname_len+8);
988 }
989
sldns_wirerr_get_rdata(uint8_t * rr,size_t len,size_t dname_len)990 uint8_t* sldns_wirerr_get_rdata(uint8_t* rr, size_t len, size_t dname_len)
991 {
992 if(len < dname_len+10)
993 return NULL;
994 return rr+dname_len+10;
995 }
996
sldns_wirerr_get_rdatawl(uint8_t * rr,size_t len,size_t dname_len)997 uint8_t* sldns_wirerr_get_rdatawl(uint8_t* rr, size_t len, size_t dname_len)
998 {
999 if(len < dname_len+10)
1000 return NULL;
1001 return rr+dname_len+8;
1002 }
1003
sldns_get_errorstr_parse(int e)1004 const char* sldns_get_errorstr_parse(int e)
1005 {
1006 sldns_lookup_table *lt;
1007 lt = sldns_lookup_by_id(sldns_wireparse_errors, LDNS_WIREPARSE_ERROR(e));
1008 return lt?lt->name:"unknown error";
1009 }
1010
1011 /* Strip whitespace from the start and the end of <line>. */
1012 char *
sldns_strip_ws(char * line)1013 sldns_strip_ws(char *line)
1014 {
1015 char *s = line, *e;
1016
1017 for (s = line; *s && isspace((unsigned char)*s); s++)
1018 ;
1019 for (e = strchr(s, 0); e > s+2 && isspace((unsigned char)e[-1]) && e[-2] != '\\'; e--)
1020 ;
1021 *e = 0;
1022 return s;
1023 }
1024
sldns_fp2wire_rr_buf(FILE * in,uint8_t * rr,size_t * len,size_t * dname_len,struct sldns_file_parse_state * parse_state)1025 int sldns_fp2wire_rr_buf(FILE* in, uint8_t* rr, size_t* len, size_t* dname_len,
1026 struct sldns_file_parse_state* parse_state)
1027 {
1028 char line[LDNS_RR_BUF_SIZE+1];
1029 ssize_t size;
1030
1031 /* read an entire line in from the file */
1032 if((size = sldns_fget_token_l(in, line, LDNS_PARSE_SKIP_SPACE,
1033 LDNS_RR_BUF_SIZE, parse_state?&parse_state->lineno:NULL))
1034 == -1) {
1035 /* if last line was empty, we are now at feof, which is not
1036 * always a parse error (happens when for instance last line
1037 * was a comment)
1038 */
1039 return LDNS_WIREPARSE_ERR_SYNTAX;
1040 }
1041
1042 /* we can have the situation, where we've read ok, but still got
1043 * no bytes to play with, in this case size is 0 */
1044 if(size == 0) {
1045 if(*len > 0)
1046 rr[0] = 0;
1047 *len = 0;
1048 *dname_len = 0;
1049 return LDNS_WIREPARSE_ERR_OK;
1050 }
1051
1052 if(strncmp(line, "$ORIGIN", 7) == 0 && isspace((unsigned char)line[7])) {
1053 int s;
1054 strlcpy((char*)rr, line, *len);
1055 *len = 0;
1056 *dname_len = 0;
1057 if(!parse_state) return LDNS_WIREPARSE_ERR_OK;
1058 parse_state->origin_len = sizeof(parse_state->origin);
1059 s = sldns_str2wire_dname_buf(sldns_strip_ws(line+8),
1060 parse_state->origin, &parse_state->origin_len);
1061 if(s) parse_state->origin_len = 0;
1062 return s;
1063 } else if(strncmp(line, "$TTL", 4) == 0 && isspace((unsigned char)line[4])) {
1064 const char* end = NULL;
1065 int overflow = 0;
1066 strlcpy((char*)rr, line, *len);
1067 *len = 0;
1068 *dname_len = 0;
1069 if(!parse_state) return LDNS_WIREPARSE_ERR_OK;
1070 parse_state->default_ttl = sldns_str2period(
1071 sldns_strip_ws(line+5), &end, &overflow);
1072 if(overflow)
1073 return LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW;
1074 } else if (strncmp(line, "$INCLUDE", 8) == 0) {
1075 strlcpy((char*)rr, line, *len);
1076 *len = 0;
1077 *dname_len = 0;
1078 return LDNS_WIREPARSE_ERR_INCLUDE;
1079 } else if (strncmp(line, "$", 1) == 0) {
1080 strlcpy((char*)rr, line, *len);
1081 *len = 0;
1082 *dname_len = 0;
1083 return LDNS_WIREPARSE_ERR_INCLUDE;
1084 } else {
1085 int r = sldns_str2wire_rr_buf(line, rr, len, dname_len,
1086 parse_state?parse_state->default_ttl:0,
1087 (parse_state&&parse_state->origin_len)?
1088 parse_state->origin:NULL,
1089 parse_state?parse_state->origin_len:0,
1090 (parse_state&&parse_state->prev_rr_len)?
1091 parse_state->prev_rr:NULL,
1092 parse_state?parse_state->prev_rr_len:0);
1093 if(r == LDNS_WIREPARSE_ERR_OK && (*dname_len) != 0 &&
1094 parse_state &&
1095 (*dname_len) <= sizeof(parse_state->prev_rr)) {
1096 memmove(parse_state->prev_rr, rr, *dname_len);
1097 parse_state->prev_rr_len = (*dname_len);
1098 }
1099 if(r == LDNS_WIREPARSE_ERR_OK && parse_state) {
1100 parse_state->default_ttl = sldns_wirerr_get_ttl(
1101 rr, *len, *dname_len);
1102 }
1103 return r;
1104 }
1105 return LDNS_WIREPARSE_ERR_OK;
1106 }
1107
1108 static int
sldns_str2wire_svcparam_key_lookup(const char * key,size_t key_len)1109 sldns_str2wire_svcparam_key_lookup(const char *key, size_t key_len)
1110 {
1111 char buf[64];
1112 char *endptr;
1113 unsigned long int key_value;
1114
1115 if (key_len >= 4 && key_len <= 8 && !strncmp(key, "key", 3)) {
1116 memcpy(buf, key + 3, key_len - 3);
1117 buf[key_len - 3] = 0;
1118 key_value = strtoul(buf, &endptr, 10);
1119
1120 if (endptr > buf /* digits seen */
1121 && *endptr == 0 /* no non-digit chars after digits */
1122 && key_value <= 65535) /* no overflow */
1123 return key_value;
1124
1125 } else switch (key_len) {
1126 case sizeof("mandatory")-1:
1127 if (!strncmp(key, "mandatory", sizeof("mandatory")-1))
1128 return SVCB_KEY_MANDATORY;
1129 if (!strncmp(key, "echconfig", sizeof("echconfig")-1))
1130 return SVCB_KEY_ECH; /* allow "echconfig" as well as "ech" */
1131 break;
1132
1133 case sizeof("alpn")-1:
1134 if (!strncmp(key, "alpn", sizeof("alpn")-1))
1135 return SVCB_KEY_ALPN;
1136 if (!strncmp(key, "port", sizeof("port")-1))
1137 return SVCB_KEY_PORT;
1138 break;
1139
1140 case sizeof("no-default-alpn")-1:
1141 if (!strncmp( key , "no-default-alpn"
1142 , sizeof("no-default-alpn")-1))
1143 return SVCB_KEY_NO_DEFAULT_ALPN;
1144 break;
1145
1146 case sizeof("ipv4hint")-1:
1147 if (!strncmp(key, "ipv4hint", sizeof("ipv4hint")-1))
1148 return SVCB_KEY_IPV4HINT;
1149 if (!strncmp(key, "ipv6hint", sizeof("ipv6hint")-1))
1150 return SVCB_KEY_IPV6HINT;
1151 break;
1152
1153 case sizeof("ech")-1:
1154 if (!strncmp(key, "ech", sizeof("ech")-1))
1155 return SVCB_KEY_ECH;
1156 break;
1157
1158 default:
1159 break;
1160 }
1161
1162 /* Although the returned value might be used by the caller,
1163 * the parser has erred, so the zone will not be loaded.
1164 */
1165 return -1;
1166 }
1167
1168 static int
sldns_str2wire_svcparam_port(const char * val,uint8_t * rd,size_t * rd_len)1169 sldns_str2wire_svcparam_port(const char* val, uint8_t* rd, size_t* rd_len)
1170 {
1171 unsigned long int port;
1172 char *endptr;
1173
1174 if (*rd_len < 6)
1175 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1176
1177 port = strtoul(val, &endptr, 10);
1178
1179 if (endptr > val /* digits seen */
1180 && *endptr == 0 /* no non-digit chars after digits */
1181 && port <= 65535) { /* no overflow */
1182
1183 sldns_write_uint16(rd, SVCB_KEY_PORT);
1184 sldns_write_uint16(rd + 2, sizeof(uint16_t));
1185 sldns_write_uint16(rd + 4, port);
1186 *rd_len = 6;
1187
1188 return LDNS_WIREPARSE_ERR_OK;
1189 }
1190
1191 return LDNS_WIREPARSE_ERR_SVCB_PORT_VALUE_SYNTAX;
1192 }
1193
1194 static int
sldns_str2wire_svcbparam_ipv4hint(const char * val,uint8_t * rd,size_t * rd_len)1195 sldns_str2wire_svcbparam_ipv4hint(const char* val, uint8_t* rd, size_t* rd_len)
1196 {
1197 size_t count;
1198 char ip_str[INET_ADDRSTRLEN+1];
1199 char *next_ip_str;
1200 size_t i;
1201
1202 for (i = 0, count = 1; val[i]; i++) {
1203 if (val[i] == ',')
1204 count += 1;
1205 if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
1206 return LDNS_WIREPARSE_ERR_SVCB_IPV4_TOO_MANY_ADDRESSES;
1207 }
1208 }
1209
1210 if (*rd_len < (LDNS_IP4ADDRLEN * count) + 4)
1211 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1212
1213 /* count is number of comma's in val + 1; so the actual number of IPv4
1214 * addresses in val
1215 */
1216 sldns_write_uint16(rd, SVCB_KEY_IPV4HINT);
1217 sldns_write_uint16(rd + 2, LDNS_IP4ADDRLEN * count);
1218 *rd_len = 4;
1219
1220 while (count) {
1221 if (!(next_ip_str = strchr(val, ','))) {
1222 if (inet_pton(AF_INET, val, rd + *rd_len) != 1)
1223 break;
1224 *rd_len += LDNS_IP4ADDRLEN;
1225
1226 assert(count == 1);
1227
1228 } else if (next_ip_str - val >= (int)sizeof(ip_str))
1229 break;
1230
1231 else {
1232 memcpy(ip_str, val, next_ip_str - val);
1233 ip_str[next_ip_str - val] = 0;
1234 if (inet_pton(AF_INET, ip_str, rd + *rd_len) != 1) {
1235 break;
1236 }
1237 *rd_len += LDNS_IP4ADDRLEN;
1238
1239 val = next_ip_str + 1;
1240 }
1241 count--;
1242 }
1243 if (count) /* verify that we parsed all values */
1244 return LDNS_WIREPARSE_ERR_SYNTAX_IP4;
1245
1246 return LDNS_WIREPARSE_ERR_OK;
1247 }
1248
1249 static int
sldns_str2wire_svcbparam_ipv6hint(const char * val,uint8_t * rd,size_t * rd_len)1250 sldns_str2wire_svcbparam_ipv6hint(const char* val, uint8_t* rd, size_t* rd_len)
1251 {
1252 size_t count;
1253 char ip_str[INET6_ADDRSTRLEN+1];
1254 char *next_ip_str;
1255 size_t i;
1256
1257 for (i = 0, count = 1; val[i]; i++) {
1258 if (val[i] == ',')
1259 count += 1;
1260 if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
1261 return LDNS_WIREPARSE_ERR_SVCB_IPV6_TOO_MANY_ADDRESSES;
1262 }
1263 }
1264
1265 if (*rd_len < (LDNS_IP6ADDRLEN * count) + 4)
1266 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1267
1268 /* count is number of comma's in val + 1; so the actual number of IPv6
1269 * addresses in val
1270 */
1271 sldns_write_uint16(rd, SVCB_KEY_IPV6HINT);
1272 sldns_write_uint16(rd + 2, LDNS_IP6ADDRLEN * count);
1273 *rd_len = 4;
1274
1275 while (count) {
1276 if (!(next_ip_str = strchr(val, ','))) {
1277 if (inet_pton(AF_INET6, val, rd + *rd_len) != 1)
1278 break;
1279 *rd_len += LDNS_IP6ADDRLEN;
1280
1281 assert(count == 1);
1282
1283 } else if (next_ip_str - val >= (int)sizeof(ip_str))
1284 break;
1285
1286 else {
1287 memcpy(ip_str, val, next_ip_str - val);
1288 ip_str[next_ip_str - val] = 0;
1289 if (inet_pton(AF_INET6, ip_str, rd + *rd_len) != 1) {
1290 break;
1291 }
1292 *rd_len += LDNS_IP6ADDRLEN;
1293
1294 val = next_ip_str + 1;
1295 }
1296 count--;
1297 }
1298 if (count) /* verify that we parsed all values */
1299 return LDNS_WIREPARSE_ERR_SYNTAX_IP6;
1300
1301 return LDNS_WIREPARSE_ERR_OK;
1302 }
1303
1304 /* compare function used for sorting uint16_t's */
1305 static int
sldns_network_uint16_cmp(const void * a,const void * b)1306 sldns_network_uint16_cmp(const void *a, const void *b)
1307 {
1308 return ((int)sldns_read_uint16(a)) - ((int)sldns_read_uint16(b));
1309 }
1310
1311 static int
sldns_str2wire_svcbparam_mandatory(const char * val,uint8_t * rd,size_t * rd_len)1312 sldns_str2wire_svcbparam_mandatory(const char* val, uint8_t* rd, size_t* rd_len)
1313 {
1314 size_t i, count, val_len;
1315 char* next_key;
1316
1317 val_len = strlen(val);
1318
1319 for (i = 0, count = 1; val[i]; i++) {
1320 if (val[i] == ',')
1321 count += 1;
1322 if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
1323 return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_TOO_MANY_KEYS;
1324 }
1325 }
1326 if (sizeof(uint16_t) * (count + 2) > *rd_len)
1327 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1328
1329 sldns_write_uint16(rd, SVCB_KEY_MANDATORY);
1330 sldns_write_uint16(rd + 2, sizeof(uint16_t) * count);
1331 *rd_len = 4;
1332
1333 while (1) {
1334 int svcparamkey;
1335
1336 if (!(next_key = strchr(val, ','))) {
1337 svcparamkey = sldns_str2wire_svcparam_key_lookup(val, val_len);
1338
1339 if (svcparamkey < 0) {
1340 return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
1341 }
1342
1343 sldns_write_uint16(rd + *rd_len, svcparamkey);
1344 *rd_len += 2;
1345 break;
1346 } else {
1347 svcparamkey = sldns_str2wire_svcparam_key_lookup(val, next_key - val);
1348
1349 if (svcparamkey < 0) {
1350 return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
1351 }
1352
1353 sldns_write_uint16(rd + *rd_len,
1354 svcparamkey);
1355 *rd_len += 2;
1356 }
1357
1358 val_len -= next_key - val + 1;
1359 val = next_key + 1; /* skip the comma */
1360 }
1361
1362 /* In draft-ietf-dnsop-svcb-https-06 Section 7:
1363 *
1364 * "In wire format, the keys are represented by their numeric
1365 * values in network byte order, concatenated in ascending order."
1366 */
1367 qsort((void *)(rd + 4), count, sizeof(uint16_t), sldns_network_uint16_cmp);
1368
1369 /* The code below revolves around semantic errors in the SVCParam set.
1370 * So long as we do not distinguish between running Unbound as a primary
1371 * or as a secondary, we default to secondary behavior and we ignore the
1372 * semantic errors. */
1373 #ifdef SVCB_SEMANTIC_ERRORS
1374 /* In draft-ietf-dnsop-svcb-https-06 Section 8
1375 * automatically mandatory MUST NOT appear in its own value-list
1376 */
1377 if (sldns_read_uint16(rd + 4) == SVCB_KEY_MANDATORY)
1378 return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_IN_MANDATORY;
1379
1380 /* Guarantee key uniqueness. After the sort we only need to
1381 * compare neighbouring keys */
1382 if (count > 1) {
1383 for (i = 0; i < count - 1; i++) {
1384 uint8_t* current_pos = (rd + 4 + (sizeof(uint16_t) * i));
1385 uint16_t key = sldns_read_uint16(current_pos);
1386
1387 if (key == sldns_read_uint16(current_pos + 2)) {
1388 return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_DUPLICATE_KEY;
1389 }
1390 }
1391 }
1392 #endif
1393 return LDNS_WIREPARSE_ERR_OK;
1394 }
1395
1396 static int
sldns_str2wire_svcbparam_ech_value(const char * val,uint8_t * rd,size_t * rd_len)1397 sldns_str2wire_svcbparam_ech_value(const char* val, uint8_t* rd, size_t* rd_len)
1398 {
1399 uint8_t buffer[LDNS_MAX_RDFLEN];
1400 int wire_len;
1401
1402 /* single 0 represents empty buffer */
1403 if(strcmp(val, "0") == 0) {
1404 if (*rd_len < 4)
1405 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1406 sldns_write_uint16(rd, SVCB_KEY_ECH);
1407 sldns_write_uint16(rd + 2, 0);
1408
1409 return LDNS_WIREPARSE_ERR_OK;
1410 }
1411
1412 wire_len = sldns_b64_pton(val, buffer, LDNS_MAX_RDFLEN);
1413
1414 if (wire_len <= 0) {
1415 return LDNS_WIREPARSE_ERR_SYNTAX_B64;
1416 } else if ((unsigned)wire_len + 4 > *rd_len) {
1417 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1418 } else {
1419 sldns_write_uint16(rd, SVCB_KEY_ECH);
1420 sldns_write_uint16(rd + 2, wire_len);
1421 memcpy(rd + 4, buffer, wire_len);
1422 *rd_len = 4 + wire_len;
1423
1424 return LDNS_WIREPARSE_ERR_OK;
1425 }
1426 }
1427
1428 static const char*
sldns_str2wire_svcbparam_parse_next_unescaped_comma(const char * val)1429 sldns_str2wire_svcbparam_parse_next_unescaped_comma(const char *val)
1430 {
1431 while (*val) {
1432 /* Only return when the comma is not escaped*/
1433 if (*val == '\\'){
1434 ++val;
1435 if (!*val)
1436 break;
1437 } else if (*val == ',')
1438 return val;
1439
1440 val++;
1441 }
1442 return NULL;
1443 }
1444
1445 /* The source is already properly unescaped, this double unescaping is purely to allow for
1446 * comma's in comma separated alpn lists.
1447 *
1448 * In draft-ietf-dnsop-svcb-https-06 Section 7:
1449 * To enable simpler parsing, this SvcParamValue MUST NOT contain escape sequences.
1450 */
1451 static size_t
sldns_str2wire_svcbparam_parse_copy_unescaped(uint8_t * dst,const char * src,size_t len)1452 sldns_str2wire_svcbparam_parse_copy_unescaped(uint8_t *dst,
1453 const char *src, size_t len)
1454 {
1455 uint8_t *orig_dst = dst;
1456
1457 while (len) {
1458 if (*src == '\\') {
1459 src++;
1460 len--;
1461 if (!len)
1462 break;
1463 }
1464 *dst++ = *src++;
1465 len--;
1466 }
1467 return (size_t)(dst - orig_dst);
1468 }
1469
1470 static int
sldns_str2wire_svcbparam_alpn_value(const char * val,uint8_t * rd,size_t * rd_len)1471 sldns_str2wire_svcbparam_alpn_value(const char* val,
1472 uint8_t* rd, size_t* rd_len)
1473 {
1474 uint8_t unescaped_dst[LDNS_MAX_RDFLEN];
1475 uint8_t *dst = unescaped_dst;
1476 const char *next_str;
1477 size_t str_len;
1478 size_t dst_len;
1479 size_t val_len;
1480
1481 val_len = strlen(val);
1482
1483 if (val_len > sizeof(unescaped_dst)) {
1484 return LDNS_WIREPARSE_ERR_SVCB_ALPN_KEY_TOO_LARGE;
1485 }
1486 while (val_len) {
1487 size_t key_len;
1488
1489 str_len = (next_str = sldns_str2wire_svcbparam_parse_next_unescaped_comma(val))
1490 ? (size_t)(next_str - val) : val_len;
1491
1492 if (str_len > 255) {
1493 return LDNS_WIREPARSE_ERR_SVCB_ALPN_KEY_TOO_LARGE;
1494 }
1495
1496 key_len = sldns_str2wire_svcbparam_parse_copy_unescaped(dst + 1, val, str_len);
1497 *dst++ = key_len;
1498 dst += key_len;
1499
1500 if (!next_str)
1501 break;
1502
1503 /* skip the comma in the next iteration */
1504 val_len -= next_str - val + 1;
1505 val = next_str + 1;
1506 }
1507 dst_len = dst - unescaped_dst;
1508 if (*rd_len < 4 + dst_len)
1509 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1510 sldns_write_uint16(rd, SVCB_KEY_ALPN);
1511 sldns_write_uint16(rd + 2, dst_len);
1512 memcpy(rd + 4, unescaped_dst, dst_len);
1513 *rd_len = 4 + dst_len;
1514
1515 return LDNS_WIREPARSE_ERR_OK;
1516 }
1517
1518 static int
sldns_str2wire_svcparam_value(const char * key,size_t key_len,const char * val,uint8_t * rd,size_t * rd_len)1519 sldns_str2wire_svcparam_value(const char *key, size_t key_len,
1520 const char *val, uint8_t* rd, size_t* rd_len)
1521 {
1522 size_t str_len;
1523 int svcparamkey = sldns_str2wire_svcparam_key_lookup(key, key_len);
1524
1525 if (svcparamkey < 0) {
1526 return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
1527 }
1528
1529 /* key without value */
1530 if (val == NULL) {
1531 switch (svcparamkey) {
1532 #ifdef SVCB_SEMANTIC_ERRORS
1533 case SVCB_KEY_MANDATORY:
1534 case SVCB_KEY_ALPN:
1535 case SVCB_KEY_PORT:
1536 case SVCB_KEY_IPV4HINT:
1537 case SVCB_KEY_IPV6HINT:
1538 return LDNS_WIREPARSE_ERR_SVCB_MISSING_PARAM;
1539 #endif
1540 default:
1541 if (*rd_len < 4)
1542 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1543 sldns_write_uint16(rd, svcparamkey);
1544 sldns_write_uint16(rd + 2, 0);
1545 *rd_len = 4;
1546
1547 return LDNS_WIREPARSE_ERR_OK;
1548 }
1549 }
1550
1551 /* value is non-empty */
1552 switch (svcparamkey) {
1553 case SVCB_KEY_PORT:
1554 return sldns_str2wire_svcparam_port(val, rd, rd_len);
1555 case SVCB_KEY_IPV4HINT:
1556 return sldns_str2wire_svcbparam_ipv4hint(val, rd, rd_len);
1557 case SVCB_KEY_IPV6HINT:
1558 return sldns_str2wire_svcbparam_ipv6hint(val, rd, rd_len);
1559 case SVCB_KEY_MANDATORY:
1560 return sldns_str2wire_svcbparam_mandatory(val, rd, rd_len);
1561 #ifdef SVCB_SEMANTIC_ERRORS
1562 case SVCB_KEY_NO_DEFAULT_ALPN:
1563 return LDNS_WIREPARSE_ERR_SVCB_NO_DEFAULT_ALPN_VALUE;
1564 #endif
1565 case SVCB_KEY_ECH:
1566 return sldns_str2wire_svcbparam_ech_value(val, rd, rd_len);
1567 case SVCB_KEY_ALPN:
1568 return sldns_str2wire_svcbparam_alpn_value(val, rd, rd_len);
1569 default:
1570 str_len = strlen(val);
1571 if (*rd_len < 4 + str_len)
1572 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1573 sldns_write_uint16(rd, svcparamkey);
1574 sldns_write_uint16(rd + 2, str_len);
1575 memcpy(rd + 4, val, str_len);
1576 *rd_len = 4 + str_len;
1577
1578 return LDNS_WIREPARSE_ERR_OK;
1579 }
1580
1581 return LDNS_WIREPARSE_ERR_GENERAL;
1582 }
1583
sldns_str2wire_svcparam_buf(const char * str,uint8_t * rd,size_t * rd_len)1584 static int sldns_str2wire_svcparam_buf(const char* str, uint8_t* rd, size_t* rd_len)
1585 {
1586 const char* eq_pos;
1587 char unescaped_val[LDNS_MAX_RDFLEN];
1588 char* val_out = unescaped_val;
1589 const char* val_in;
1590
1591 eq_pos = strchr(str, '=');
1592
1593 /* case: key=value */
1594 if (eq_pos != NULL && eq_pos[1]) {
1595 val_in = eq_pos + 1;
1596
1597 /* unescape characters and "" blocks */
1598 if (*val_in == '"') {
1599 val_in++;
1600 while (*val_in != '"'
1601 && (size_t)(val_out - unescaped_val + 1) < sizeof(unescaped_val)
1602 && sldns_parse_char( (uint8_t*) val_out, &val_in)) {
1603 val_out++;
1604 }
1605 } else {
1606 while ((size_t)(val_out - unescaped_val + 1) < sizeof(unescaped_val)
1607 && sldns_parse_char( (uint8_t*) val_out, &val_in)) {
1608 val_out++;
1609 }
1610 }
1611 *val_out = 0;
1612
1613 return sldns_str2wire_svcparam_value(str, eq_pos - str,
1614 unescaped_val[0] ? unescaped_val : NULL, rd, rd_len);
1615 }
1616 /* case: key= */
1617 else if (eq_pos != NULL && !(eq_pos[1])) {
1618 return sldns_str2wire_svcparam_value(str, eq_pos - str, NULL, rd, rd_len);
1619 }
1620 /* case: key */
1621 else {
1622 return sldns_str2wire_svcparam_value(str, strlen(str), NULL, rd, rd_len);
1623 }
1624 }
1625
sldns_str2wire_rdf_buf(const char * str,uint8_t * rd,size_t * len,sldns_rdf_type rdftype)1626 int sldns_str2wire_rdf_buf(const char* str, uint8_t* rd, size_t* len,
1627 sldns_rdf_type rdftype)
1628 {
1629 switch (rdftype) {
1630 case LDNS_RDF_TYPE_DNAME:
1631 return sldns_str2wire_dname_buf(str, rd, len);
1632 case LDNS_RDF_TYPE_INT8:
1633 return sldns_str2wire_int8_buf(str, rd, len);
1634 case LDNS_RDF_TYPE_INT16:
1635 return sldns_str2wire_int16_buf(str, rd, len);
1636 case LDNS_RDF_TYPE_INT32:
1637 return sldns_str2wire_int32_buf(str, rd, len);
1638 case LDNS_RDF_TYPE_A:
1639 return sldns_str2wire_a_buf(str, rd, len);
1640 case LDNS_RDF_TYPE_AAAA:
1641 return sldns_str2wire_aaaa_buf(str, rd, len);
1642 case LDNS_RDF_TYPE_STR:
1643 return sldns_str2wire_str_buf(str, rd, len);
1644 case LDNS_RDF_TYPE_APL:
1645 return sldns_str2wire_apl_buf(str, rd, len);
1646 case LDNS_RDF_TYPE_B64:
1647 return sldns_str2wire_b64_buf(str, rd, len);
1648 case LDNS_RDF_TYPE_B32_EXT:
1649 return sldns_str2wire_b32_ext_buf(str, rd, len);
1650 case LDNS_RDF_TYPE_HEX:
1651 return sldns_str2wire_hex_buf(str, rd, len);
1652 case LDNS_RDF_TYPE_NSEC:
1653 return sldns_str2wire_nsec_buf(str, rd, len);
1654 case LDNS_RDF_TYPE_TYPE:
1655 return sldns_str2wire_type_buf(str, rd, len);
1656 case LDNS_RDF_TYPE_CLASS:
1657 return sldns_str2wire_class_buf(str, rd, len);
1658 case LDNS_RDF_TYPE_CERT_ALG:
1659 return sldns_str2wire_cert_alg_buf(str, rd, len);
1660 case LDNS_RDF_TYPE_ALG:
1661 return sldns_str2wire_alg_buf(str, rd, len);
1662 case LDNS_RDF_TYPE_TIME:
1663 return sldns_str2wire_time_buf(str, rd, len);
1664 case LDNS_RDF_TYPE_PERIOD:
1665 return sldns_str2wire_period_buf(str, rd, len);
1666 case LDNS_RDF_TYPE_TSIGTIME:
1667 return sldns_str2wire_tsigtime_buf(str, rd, len);
1668 case LDNS_RDF_TYPE_LOC:
1669 return sldns_str2wire_loc_buf(str, rd, len);
1670 case LDNS_RDF_TYPE_WKS:
1671 return sldns_str2wire_wks_buf(str, rd, len);
1672 case LDNS_RDF_TYPE_NSAP:
1673 return sldns_str2wire_nsap_buf(str, rd, len);
1674 case LDNS_RDF_TYPE_ATMA:
1675 return sldns_str2wire_atma_buf(str, rd, len);
1676 case LDNS_RDF_TYPE_IPSECKEY:
1677 return sldns_str2wire_ipseckey_buf(str, rd, len);
1678 case LDNS_RDF_TYPE_NSEC3_SALT:
1679 return sldns_str2wire_nsec3_salt_buf(str, rd, len);
1680 case LDNS_RDF_TYPE_NSEC3_NEXT_OWNER:
1681 return sldns_str2wire_b32_ext_buf(str, rd, len);
1682 case LDNS_RDF_TYPE_ILNP64:
1683 return sldns_str2wire_ilnp64_buf(str, rd, len);
1684 case LDNS_RDF_TYPE_EUI48:
1685 return sldns_str2wire_eui48_buf(str, rd, len);
1686 case LDNS_RDF_TYPE_EUI64:
1687 return sldns_str2wire_eui64_buf(str, rd, len);
1688 case LDNS_RDF_TYPE_TAG:
1689 return sldns_str2wire_tag_buf(str, rd, len);
1690 case LDNS_RDF_TYPE_LONG_STR:
1691 return sldns_str2wire_long_str_buf(str, rd, len);
1692 case LDNS_RDF_TYPE_TSIGERROR:
1693 return sldns_str2wire_tsigerror_buf(str, rd, len);
1694 case LDNS_RDF_TYPE_HIP:
1695 return sldns_str2wire_hip_buf(str, rd, len);
1696 case LDNS_RDF_TYPE_INT16_DATA:
1697 return sldns_str2wire_int16_data_buf(str, rd, len);
1698 case LDNS_RDF_TYPE_SVCPARAM:
1699 return sldns_str2wire_svcparam_buf(str, rd, len);
1700 case LDNS_RDF_TYPE_UNKNOWN:
1701 case LDNS_RDF_TYPE_SERVICE:
1702 return LDNS_WIREPARSE_ERR_NOT_IMPL;
1703 case LDNS_RDF_TYPE_NONE:
1704 default:
1705 break;
1706 }
1707 return LDNS_WIREPARSE_ERR_GENERAL;
1708 }
1709
sldns_str2wire_int8_buf(const char * str,uint8_t * rd,size_t * len)1710 int sldns_str2wire_int8_buf(const char* str, uint8_t* rd, size_t* len)
1711 {
1712 char* end;
1713 uint8_t r = (uint8_t)strtol((char*)str, &end, 10);
1714 if(*end != 0)
1715 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
1716 if(*len < 1)
1717 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1718 rd[0] = r;
1719 *len = 1;
1720 return LDNS_WIREPARSE_ERR_OK;
1721 }
1722
sldns_str2wire_int16_buf(const char * str,uint8_t * rd,size_t * len)1723 int sldns_str2wire_int16_buf(const char* str, uint8_t* rd, size_t* len)
1724 {
1725 char* end;
1726 uint16_t r = (uint16_t)strtol((char*)str, &end, 10);
1727 if(*end != 0)
1728 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
1729 if(*len < 2)
1730 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1731 sldns_write_uint16(rd, r);
1732 *len = 2;
1733 return LDNS_WIREPARSE_ERR_OK;
1734 }
1735
sldns_str2wire_int32_buf(const char * str,uint8_t * rd,size_t * len)1736 int sldns_str2wire_int32_buf(const char* str, uint8_t* rd, size_t* len)
1737 {
1738 char* end;
1739 uint32_t r;
1740 errno = 0; /* must set to zero before call,
1741 note race condition on errno */
1742 if(*str == '-')
1743 r = (uint32_t)strtol((char*)str, &end, 10);
1744 else r = (uint32_t)strtoul((char*)str, &end, 10);
1745 if(*end != 0)
1746 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
1747 if(errno == ERANGE)
1748 return LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW;
1749 if(*len < 4)
1750 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1751 sldns_write_uint32(rd, r);
1752 *len = 4;
1753 return LDNS_WIREPARSE_ERR_OK;
1754 }
1755
sldns_str2wire_a_buf(const char * str,uint8_t * rd,size_t * len)1756 int sldns_str2wire_a_buf(const char* str, uint8_t* rd, size_t* len)
1757 {
1758 struct in_addr address;
1759 if(inet_pton(AF_INET, (char*)str, &address) != 1)
1760 return LDNS_WIREPARSE_ERR_SYNTAX_IP4;
1761 if(*len < sizeof(address))
1762 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1763 memmove(rd, &address, sizeof(address));
1764 *len = sizeof(address);
1765 return LDNS_WIREPARSE_ERR_OK;
1766 }
1767
sldns_str2wire_aaaa_buf(const char * str,uint8_t * rd,size_t * len)1768 int sldns_str2wire_aaaa_buf(const char* str, uint8_t* rd, size_t* len)
1769 {
1770 #ifdef AF_INET6
1771 uint8_t address[LDNS_IP6ADDRLEN + 1];
1772 if(inet_pton(AF_INET6, (char*)str, address) != 1)
1773 return LDNS_WIREPARSE_ERR_SYNTAX_IP6;
1774 if(*len < LDNS_IP6ADDRLEN)
1775 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1776 memmove(rd, address, LDNS_IP6ADDRLEN);
1777 *len = LDNS_IP6ADDRLEN;
1778 return LDNS_WIREPARSE_ERR_OK;
1779 #else
1780 return LDNS_WIREPARSE_ERR_NOT_IMPL;
1781 #endif
1782 }
1783
sldns_str2wire_str_buf(const char * str,uint8_t * rd,size_t * len)1784 int sldns_str2wire_str_buf(const char* str, uint8_t* rd, size_t* len)
1785 {
1786 uint8_t ch = 0;
1787 size_t sl = 0;
1788 const char* s = str;
1789 /* skip length byte */
1790 if(*len < 1)
1791 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1792
1793 /* read characters */
1794 while(sldns_parse_char(&ch, &s)) {
1795 if(sl >= 255)
1796 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR, s-str);
1797 if(*len < sl+2)
1798 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
1799 s-str);
1800 rd[++sl] = ch;
1801 }
1802 if(!s)
1803 return LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE;
1804 rd[0] = (uint8_t)sl;
1805 *len = sl+1;
1806 return LDNS_WIREPARSE_ERR_OK;
1807 }
1808
sldns_str2wire_apl_buf(const char * str,uint8_t * rd,size_t * len)1809 int sldns_str2wire_apl_buf(const char* str, uint8_t* rd, size_t* len)
1810 {
1811 const char *my_str = str;
1812
1813 char my_ip_str[64];
1814 size_t ip_str_len;
1815
1816 uint16_t family;
1817 int negation;
1818 size_t adflength = 0;
1819 uint8_t data[16+4];
1820 uint8_t prefix;
1821 size_t i;
1822
1823 if(*my_str == '\0') {
1824 /* empty APL element, no data, no string */
1825 *len = 0;
1826 return LDNS_WIREPARSE_ERR_OK;
1827 }
1828
1829 /* [!]afi:address/prefix */
1830 if (strlen(my_str) < 2
1831 || strchr(my_str, ':') == NULL
1832 || strchr(my_str, '/') == NULL
1833 || strchr(my_str, ':') > strchr(my_str, '/')) {
1834 return LDNS_WIREPARSE_ERR_INVALID_STR;
1835 }
1836
1837 if (my_str[0] == '!') {
1838 negation = 1;
1839 my_str += 1;
1840 } else {
1841 negation = 0;
1842 }
1843
1844 family = (uint16_t) atoi(my_str);
1845
1846 my_str = strchr(my_str, ':') + 1;
1847
1848 /* need ip addr and only ip addr for inet_pton */
1849 ip_str_len = (size_t) (strchr(my_str, '/') - my_str);
1850 if(ip_str_len+1 > sizeof(my_ip_str))
1851 return LDNS_WIREPARSE_ERR_INVALID_STR;
1852 (void)strlcpy(my_ip_str, my_str, sizeof(my_ip_str));
1853 my_ip_str[ip_str_len] = 0;
1854
1855 if (family == 1) {
1856 /* ipv4 */
1857 if(inet_pton(AF_INET, my_ip_str, data+4) == 0)
1858 return LDNS_WIREPARSE_ERR_INVALID_STR;
1859 for (i = 0; i < 4; i++) {
1860 if (data[i+4] != 0) {
1861 adflength = i + 1;
1862 }
1863 }
1864 } else if (family == 2) {
1865 /* ipv6 */
1866 if (inet_pton(AF_INET6, my_ip_str, data+4) == 0)
1867 return LDNS_WIREPARSE_ERR_INVALID_STR;
1868 for (i = 0; i < 16; i++) {
1869 if (data[i+4] != 0) {
1870 adflength = i + 1;
1871 }
1872 }
1873 } else {
1874 /* unknown family */
1875 return LDNS_WIREPARSE_ERR_INVALID_STR;
1876 }
1877
1878 my_str = strchr(my_str, '/') + 1;
1879 prefix = (uint8_t) atoi(my_str);
1880
1881 sldns_write_uint16(data, family);
1882 data[2] = prefix;
1883 data[3] = (uint8_t)adflength;
1884 if (negation) {
1885 /* set bit 1 of byte 3 */
1886 data[3] = data[3] | 0x80;
1887 }
1888
1889 if(*len < 4+adflength)
1890 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1891 memmove(rd, data, 4+adflength);
1892 *len = 4+adflength;
1893 return LDNS_WIREPARSE_ERR_OK;
1894 }
1895
sldns_str2wire_b64_buf(const char * str,uint8_t * rd,size_t * len)1896 int sldns_str2wire_b64_buf(const char* str, uint8_t* rd, size_t* len)
1897 {
1898 size_t sz = sldns_b64_pton_calculate_size(strlen(str));
1899 int n;
1900 if(strcmp(str, "0") == 0) {
1901 *len = 0;
1902 return LDNS_WIREPARSE_ERR_OK;
1903 }
1904 if(*len < sz)
1905 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1906 n = sldns_b64_pton(str, rd, *len);
1907 if(n < 0)
1908 return LDNS_WIREPARSE_ERR_SYNTAX_B64;
1909 *len = (size_t)n;
1910 return LDNS_WIREPARSE_ERR_OK;
1911 }
1912
sldns_str2wire_b32_ext_buf(const char * str,uint8_t * rd,size_t * len)1913 int sldns_str2wire_b32_ext_buf(const char* str, uint8_t* rd, size_t* len)
1914 {
1915 size_t slen = strlen(str);
1916 size_t sz = sldns_b32_pton_calculate_size(slen);
1917 int n;
1918 if(*len < 1+sz)
1919 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
1920 rd[0] = (uint8_t)sz;
1921 n = sldns_b32_pton_extended_hex(str, slen, rd+1, *len-1);
1922 if(n < 0)
1923 return LDNS_WIREPARSE_ERR_SYNTAX_B32_EXT;
1924 *len = (size_t)n+1;
1925 return LDNS_WIREPARSE_ERR_OK;
1926 }
1927
1928 /** see if the string ends, or ends in whitespace */
1929 static int
sldns_is_last_of_string(const char * str)1930 sldns_is_last_of_string(const char* str)
1931 {
1932 if(*str == 0) return 1;
1933 while(isspace((unsigned char)*str))
1934 str++;
1935 if(*str == 0) return 1;
1936 return 0;
1937 }
1938
sldns_str2wire_hex_buf(const char * str,uint8_t * rd,size_t * len)1939 int sldns_str2wire_hex_buf(const char* str, uint8_t* rd, size_t* len)
1940 {
1941 const char* s = str;
1942 size_t dlen = 0; /* number of hexdigits parsed */
1943 while(*s) {
1944 if(isspace((unsigned char)*s)) {
1945 s++;
1946 continue;
1947 }
1948 if(dlen == 0 && *s == '0' && sldns_is_last_of_string(s+1)) {
1949 *len = 0;
1950 return LDNS_WIREPARSE_ERR_OK;
1951 }
1952 if(!isxdigit((unsigned char)*s))
1953 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
1954 if(*len < dlen/2 + 1)
1955 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
1956 s-str);
1957 if((dlen&1)==0)
1958 rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
1959 else rd[dlen/2] += (uint8_t)sldns_hexdigit_to_int(*s++);
1960 dlen++;
1961 }
1962 if((dlen&1)!=0)
1963 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
1964 *len = dlen/2;
1965 return LDNS_WIREPARSE_ERR_OK;
1966 }
1967
sldns_str2wire_nsec_buf(const char * str,uint8_t * rd,size_t * len)1968 int sldns_str2wire_nsec_buf(const char* str, uint8_t* rd, size_t* len)
1969 {
1970 const char *delim = "\n\t ";
1971 char token[64]; /* for a type name */
1972 size_t type_count = 0;
1973 int block;
1974 size_t used = 0;
1975 uint16_t maxtype = 0;
1976 uint8_t typebits[8192]; /* 65536 bits */
1977 uint8_t window_in_use[256];
1978
1979 /* string in buffer */
1980 sldns_buffer strbuf;
1981 sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
1982
1983 /* parse the types */
1984 memset(typebits, 0, sizeof(typebits));
1985 memset(window_in_use, 0, sizeof(window_in_use));
1986 while(sldns_buffer_remaining(&strbuf) > 0 &&
1987 sldns_bget_token(&strbuf, token, delim, sizeof(token)) != -1) {
1988 uint16_t t = sldns_get_rr_type_by_name(token);
1989 if(token[0] == 0)
1990 continue;
1991 if(t == 0 && strcmp(token, "TYPE0") != 0)
1992 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
1993 sldns_buffer_position(&strbuf));
1994 typebits[t/8] |= (0x80>>(t%8));
1995 window_in_use[t/256] = 1;
1996 type_count++;
1997 if(t > maxtype) maxtype = t;
1998 }
1999
2000 /* empty NSEC bitmap */
2001 if(type_count == 0) {
2002 *len = 0;
2003 return LDNS_WIREPARSE_ERR_OK;
2004 }
2005
2006 /* encode windows {u8 windowblock, u8 bitmaplength, 0-32u8 bitmap},
2007 * block is 0-255 upper octet of types, length if 0-32. */
2008 for(block = 0; block <= (int)maxtype/256; block++) {
2009 int i, blocklen = 0;
2010 if(!window_in_use[block])
2011 continue;
2012 for(i=0; i<32; i++) {
2013 if(typebits[block*32+i] != 0)
2014 blocklen = i+1;
2015 }
2016 if(blocklen == 0)
2017 continue; /* empty window should have been !in_use */
2018 if(used+blocklen+2 > *len)
2019 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2020 rd[used+0] = (uint8_t)block;
2021 rd[used+1] = (uint8_t)blocklen;
2022 for(i=0; i<blocklen; i++) {
2023 rd[used+2+i] = typebits[block*32+i];
2024 }
2025 used += blocklen+2;
2026 }
2027 *len = used;
2028 return LDNS_WIREPARSE_ERR_OK;
2029 }
2030
sldns_str2wire_type_buf(const char * str,uint8_t * rd,size_t * len)2031 int sldns_str2wire_type_buf(const char* str, uint8_t* rd, size_t* len)
2032 {
2033 uint16_t t = sldns_get_rr_type_by_name(str);
2034 if(t == 0 && strcmp(str, "TYPE0") != 0)
2035 return LDNS_WIREPARSE_ERR_SYNTAX_TYPE;
2036 if(*len < 2)
2037 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2038 sldns_write_uint16(rd, t);
2039 *len = 2;
2040 return LDNS_WIREPARSE_ERR_OK;
2041 }
2042
sldns_str2wire_class_buf(const char * str,uint8_t * rd,size_t * len)2043 int sldns_str2wire_class_buf(const char* str, uint8_t* rd, size_t* len)
2044 {
2045 uint16_t c = sldns_get_rr_class_by_name(str);
2046 if(c == 0 && strcmp(str, "CLASS0") != 0)
2047 return LDNS_WIREPARSE_ERR_SYNTAX_CLASS;
2048 if(*len < 2)
2049 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2050 sldns_write_uint16(rd, c);
2051 *len = 2;
2052 return LDNS_WIREPARSE_ERR_OK;
2053 }
2054
2055 /* An certificate alg field can either be specified as a 8 bits number
2056 * or by its symbolic name. Handle both */
sldns_str2wire_cert_alg_buf(const char * str,uint8_t * rd,size_t * len)2057 int sldns_str2wire_cert_alg_buf(const char* str, uint8_t* rd, size_t* len)
2058 {
2059 sldns_lookup_table *lt = sldns_lookup_by_name(sldns_cert_algorithms,
2060 str);
2061 if(*len < 2)
2062 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2063 if(lt) {
2064 sldns_write_uint16(rd, (uint16_t)lt->id);
2065 } else {
2066 int s = sldns_str2wire_int16_buf(str, rd, len);
2067 if(s) return s;
2068 if(sldns_read_uint16(rd) == 0)
2069 return LDNS_WIREPARSE_ERR_CERT_BAD_ALGORITHM;
2070 }
2071 *len = 2;
2072 return LDNS_WIREPARSE_ERR_OK;
2073 }
2074
2075 /* An alg field can either be specified as a 8 bits number
2076 * or by its symbolic name. Handle both */
sldns_str2wire_alg_buf(const char * str,uint8_t * rd,size_t * len)2077 int sldns_str2wire_alg_buf(const char* str, uint8_t* rd, size_t* len)
2078 {
2079 sldns_lookup_table *lt = sldns_lookup_by_name(sldns_algorithms, str);
2080 if(*len < 1)
2081 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2082 if(lt) {
2083 rd[0] = (uint8_t)lt->id;
2084 *len = 1;
2085 } else {
2086 /* try as-is (a number) */
2087 return sldns_str2wire_int8_buf(str, rd, len);
2088 }
2089 return LDNS_WIREPARSE_ERR_OK;
2090 }
2091
sldns_str2wire_tsigerror_buf(const char * str,uint8_t * rd,size_t * len)2092 int sldns_str2wire_tsigerror_buf(const char* str, uint8_t* rd, size_t* len)
2093 {
2094 sldns_lookup_table *lt = sldns_lookup_by_name(sldns_tsig_errors, str);
2095 if(*len < 2)
2096 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2097 if(lt) {
2098 sldns_write_uint16(rd, (uint16_t)lt->id);
2099 *len = 2;
2100 } else {
2101 /* try as-is (a number) */
2102 return sldns_str2wire_int16_buf(str, rd, len);
2103 }
2104 return LDNS_WIREPARSE_ERR_OK;
2105 }
2106
sldns_str2wire_time_buf(const char * str,uint8_t * rd,size_t * len)2107 int sldns_str2wire_time_buf(const char* str, uint8_t* rd, size_t* len)
2108 {
2109 /* convert a time YYYYDDMMHHMMSS to wireformat */
2110 struct tm tm;
2111 if(*len < 4)
2112 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2113
2114 /* Try to scan the time... */
2115 memset(&tm, 0, sizeof(tm));
2116 if (strlen(str) == 14 && sscanf(str, "%4d%2d%2d%2d%2d%2d",
2117 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
2118 &tm.tm_min, &tm.tm_sec) == 6) {
2119 tm.tm_year -= 1900;
2120 tm.tm_mon--;
2121 /* Check values */
2122 if (tm.tm_year < 70)
2123 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2124 if (tm.tm_mon < 0 || tm.tm_mon > 11)
2125 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2126 if (tm.tm_mday < 1 || tm.tm_mday > 31)
2127 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2128 if (tm.tm_hour < 0 || tm.tm_hour > 23)
2129 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2130 if (tm.tm_min < 0 || tm.tm_min > 59)
2131 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2132 if (tm.tm_sec < 0 || tm.tm_sec > 59)
2133 return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
2134
2135 sldns_write_uint32(rd, (uint32_t)sldns_mktime_from_utc(&tm));
2136 } else {
2137 /* handle it as 32 bits timestamp */
2138 char *end;
2139 uint32_t l = (uint32_t)strtol((char*)str, &end, 10);
2140 if(*end != 0)
2141 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TIME,
2142 end-(char*)str);
2143 sldns_write_uint32(rd, l);
2144 }
2145 *len = 4;
2146 return LDNS_WIREPARSE_ERR_OK;
2147 }
2148
sldns_str2wire_tsigtime_buf(const char * str,uint8_t * rd,size_t * len)2149 int sldns_str2wire_tsigtime_buf(const char* str, uint8_t* rd, size_t* len)
2150 {
2151 char* end;
2152 uint64_t t = (uint64_t)strtol((char*)str, &end, 10);
2153 uint16_t high;
2154 uint32_t low;
2155 if(*end != 0)
2156 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TIME, end-str);
2157 if(*len < 6)
2158 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2159 high = (uint16_t)(t>>32);
2160 low = (uint32_t)(t);
2161 sldns_write_uint16(rd, high);
2162 sldns_write_uint32(rd+2, low);
2163 *len = 6;
2164 return LDNS_WIREPARSE_ERR_OK;
2165 }
2166
sldns_str2wire_period_buf(const char * str,uint8_t * rd,size_t * len)2167 int sldns_str2wire_period_buf(const char* str, uint8_t* rd, size_t* len)
2168 {
2169 const char* end;
2170 int overflow;
2171 uint32_t p = sldns_str2period(str, &end, &overflow);
2172 if(*end != 0)
2173 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_PERIOD, end-str);
2174 if(overflow)
2175 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW,
2176 end-str);
2177 if(*len < 4)
2178 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2179 sldns_write_uint32(rd, p);
2180 *len = 4;
2181 return LDNS_WIREPARSE_ERR_OK;
2182 }
2183
2184 /** read "<digits>[.<digits>][mM]" into mantissa exponent format for LOC type */
2185 static int
loc_parse_cm(char * my_str,char ** endstr,uint8_t * m,uint8_t * e)2186 loc_parse_cm(char* my_str, char** endstr, uint8_t* m, uint8_t* e)
2187 {
2188 uint32_t meters = 0, cm = 0, val;
2189 char* cm_endstr;
2190 while (isblank((unsigned char)*my_str)) {
2191 my_str++;
2192 }
2193 meters = (uint32_t)strtol(my_str, &my_str, 10);
2194 if (*my_str == '.') {
2195 my_str++;
2196 cm = (uint32_t)strtol(my_str, &cm_endstr, 10);
2197 if(cm_endstr == my_str + 1)
2198 cm *= 10;
2199 my_str = cm_endstr;
2200 }
2201 if (meters >= 1) {
2202 *e = 2;
2203 val = meters;
2204 } else {
2205 *e = 0;
2206 val = cm;
2207 }
2208 while(val >= 10) {
2209 (*e)++;
2210 val /= 10;
2211 }
2212 *m = (uint8_t)val;
2213
2214 if (*e > 9)
2215 return 0;
2216 if (*my_str == 'm' || *my_str == 'M') {
2217 my_str++;
2218 }
2219 *endstr = my_str;
2220 return 1;
2221 }
2222
sldns_str2wire_loc_buf(const char * str,uint8_t * rd,size_t * len)2223 int sldns_str2wire_loc_buf(const char* str, uint8_t* rd, size_t* len)
2224 {
2225 uint32_t latitude = 0;
2226 uint32_t longitude = 0;
2227 uint32_t altitude = 0;
2228
2229 uint32_t equator = (uint32_t)1<<31; /* 2**31 */
2230
2231 /* only support version 0 */
2232 uint32_t h = 0;
2233 uint32_t m = 0;
2234 uint8_t size_b = 1, size_e = 2;
2235 uint8_t horiz_pre_b = 1, horiz_pre_e = 6;
2236 uint8_t vert_pre_b = 1, vert_pre_e = 3;
2237
2238 double s = 0.0;
2239 int northerness;
2240 int easterness;
2241
2242 char *my_str = (char *) str;
2243
2244 if (isdigit((unsigned char) *my_str)) {
2245 h = (uint32_t) strtol(my_str, &my_str, 10);
2246 } else {
2247 return LDNS_WIREPARSE_ERR_INVALID_STR;
2248 }
2249
2250 while (isblank((unsigned char) *my_str)) {
2251 my_str++;
2252 }
2253
2254 if (isdigit((unsigned char) *my_str)) {
2255 m = (uint32_t) strtol(my_str, &my_str, 10);
2256 } else if (*my_str == 'N' || *my_str == 'S') {
2257 goto north;
2258 } else {
2259 return LDNS_WIREPARSE_ERR_INVALID_STR;
2260 }
2261
2262 while (isblank((unsigned char) *my_str)) {
2263 my_str++;
2264 }
2265
2266 if (isdigit((unsigned char) *my_str)) {
2267 s = strtod(my_str, &my_str);
2268 }
2269
2270 /* skip blanks before northerness */
2271 while (isblank((unsigned char) *my_str)) {
2272 my_str++;
2273 }
2274
2275 north:
2276 if (*my_str == 'N') {
2277 northerness = 1;
2278 } else if (*my_str == 'S') {
2279 northerness = 0;
2280 } else {
2281 return LDNS_WIREPARSE_ERR_INVALID_STR;
2282 }
2283
2284 my_str++;
2285
2286 /* store number */
2287 s = 1000.0 * s;
2288 /* add a little to make floor in conversion a round */
2289 s += 0.0005;
2290 latitude = (uint32_t) s;
2291 latitude += 1000 * 60 * m;
2292 latitude += 1000 * 60 * 60 * h;
2293 if (northerness) {
2294 latitude = equator + latitude;
2295 } else {
2296 latitude = equator - latitude;
2297 }
2298 while (isblank((unsigned char)*my_str)) {
2299 my_str++;
2300 }
2301
2302 if (isdigit((unsigned char) *my_str)) {
2303 h = (uint32_t) strtol(my_str, &my_str, 10);
2304 } else {
2305 return LDNS_WIREPARSE_ERR_INVALID_STR;
2306 }
2307
2308 while (isblank((unsigned char) *my_str)) {
2309 my_str++;
2310 }
2311
2312 if (isdigit((unsigned char) *my_str)) {
2313 m = (uint32_t) strtol(my_str, &my_str, 10);
2314 } else if (*my_str == 'E' || *my_str == 'W') {
2315 goto east;
2316 } else {
2317 return LDNS_WIREPARSE_ERR_INVALID_STR;
2318 }
2319
2320 while (isblank((unsigned char)*my_str)) {
2321 my_str++;
2322 }
2323
2324 if (isdigit((unsigned char) *my_str)) {
2325 s = strtod(my_str, &my_str);
2326 }
2327
2328 /* skip blanks before easterness */
2329 while (isblank((unsigned char)*my_str)) {
2330 my_str++;
2331 }
2332
2333 east:
2334 if (*my_str == 'E') {
2335 easterness = 1;
2336 } else if (*my_str == 'W') {
2337 easterness = 0;
2338 } else {
2339 return LDNS_WIREPARSE_ERR_INVALID_STR;
2340 }
2341
2342 my_str++;
2343
2344 /* store number */
2345 s *= 1000.0;
2346 /* add a little to make floor in conversion a round */
2347 s += 0.0005;
2348 longitude = (uint32_t) s;
2349 longitude += 1000 * 60 * m;
2350 longitude += 1000 * 60 * 60 * h;
2351
2352 if (easterness) {
2353 longitude += equator;
2354 } else {
2355 longitude = equator - longitude;
2356 }
2357
2358 altitude = (uint32_t)(strtod(my_str, &my_str)*100.0 +
2359 10000000.0 + 0.5);
2360 if (*my_str == 'm' || *my_str == 'M') {
2361 my_str++;
2362 }
2363
2364 if (strlen(my_str) > 0) {
2365 if(!loc_parse_cm(my_str, &my_str, &size_b, &size_e))
2366 return LDNS_WIREPARSE_ERR_INVALID_STR;
2367 }
2368
2369 if (strlen(my_str) > 0) {
2370 if(!loc_parse_cm(my_str, &my_str, &horiz_pre_b, &horiz_pre_e))
2371 return LDNS_WIREPARSE_ERR_INVALID_STR;
2372 }
2373
2374 if (strlen(my_str) > 0) {
2375 if(!loc_parse_cm(my_str, &my_str, &vert_pre_b, &vert_pre_e))
2376 return LDNS_WIREPARSE_ERR_INVALID_STR;
2377 }
2378
2379 if(*len < 16)
2380 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2381 rd[0] = 0;
2382 rd[1] = ((size_b << 4) & 0xf0) | (size_e & 0x0f);
2383 rd[2] = ((horiz_pre_b << 4) & 0xf0) | (horiz_pre_e & 0x0f);
2384 rd[3] = ((vert_pre_b << 4) & 0xf0) | (vert_pre_e & 0x0f);
2385 sldns_write_uint32(rd + 4, latitude);
2386 sldns_write_uint32(rd + 8, longitude);
2387 sldns_write_uint32(rd + 12, altitude);
2388 *len = 16;
2389 return LDNS_WIREPARSE_ERR_OK;
2390 }
2391
2392 static void
ldns_tolower_str(char * s)2393 ldns_tolower_str(char* s)
2394 {
2395 if(s) {
2396 while(*s) {
2397 *s = (char)tolower((unsigned char)*s);
2398 s++;
2399 }
2400 }
2401 }
2402
sldns_str2wire_wks_buf(const char * str,uint8_t * rd,size_t * len)2403 int sldns_str2wire_wks_buf(const char* str, uint8_t* rd, size_t* len)
2404 {
2405 int rd_len = 1;
2406 int have_proto = 0;
2407 char token[50], proto_str[50];
2408 sldns_buffer strbuf;
2409 sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
2410 proto_str[0]=0;
2411
2412 /* check we have one byte for proto */
2413 if(*len < 1)
2414 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2415
2416 while(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) > 0) {
2417 ldns_tolower_str(token);
2418 if(!have_proto) {
2419 struct protoent *p = getprotobyname(token);
2420 have_proto = 1;
2421 if(p) rd[0] = (uint8_t)p->p_proto;
2422 else if(strcasecmp(token, "tcp")==0) rd[0]=6;
2423 else if(strcasecmp(token, "udp")==0) rd[0]=17;
2424 else rd[0] = (uint8_t)atoi(token);
2425 (void)strlcpy(proto_str, token, sizeof(proto_str));
2426 } else {
2427 int serv_port;
2428 struct servent *serv = getservbyname(token, proto_str);
2429 if(serv) serv_port=(int)ntohs((uint16_t)serv->s_port);
2430 else if(strcasecmp(token, "domain")==0) serv_port=53;
2431 else {
2432 serv_port = atoi(token);
2433 if(serv_port == 0 && strcmp(token, "0") != 0) {
2434 #ifdef HAVE_ENDSERVENT
2435 endservent();
2436 #endif
2437 #ifdef HAVE_ENDPROTOENT
2438 endprotoent();
2439 #endif
2440 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
2441 sldns_buffer_position(&strbuf));
2442 }
2443 if(serv_port < 0 || serv_port > 65535) {
2444 #ifdef HAVE_ENDSERVENT
2445 endservent();
2446 #endif
2447 #ifdef HAVE_ENDPROTOENT
2448 endprotoent();
2449 #endif
2450 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
2451 sldns_buffer_position(&strbuf));
2452 }
2453 }
2454 if(rd_len < 1+serv_port/8+1) {
2455 /* bitmap is larger, init new bytes at 0 */
2456 if(*len < 1+(size_t)serv_port/8+1) {
2457 #ifdef HAVE_ENDSERVENT
2458 endservent();
2459 #endif
2460 #ifdef HAVE_ENDPROTOENT
2461 endprotoent();
2462 #endif
2463 return RET_ERR(
2464 LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
2465 sldns_buffer_position(&strbuf));
2466 }
2467 memset(rd+rd_len, 0, 1+(size_t)serv_port/8+1-rd_len);
2468 rd_len = 1+serv_port/8+1;
2469 }
2470 rd[1+ serv_port/8] |= (1 << (7 - serv_port % 8));
2471 }
2472 }
2473 *len = (size_t)rd_len;
2474
2475 #ifdef HAVE_ENDSERVENT
2476 endservent();
2477 #endif
2478 #ifdef HAVE_ENDPROTOENT
2479 endprotoent();
2480 #endif
2481 return LDNS_WIREPARSE_ERR_OK;
2482 }
2483
sldns_str2wire_nsap_buf(const char * str,uint8_t * rd,size_t * len)2484 int sldns_str2wire_nsap_buf(const char* str, uint8_t* rd, size_t* len)
2485 {
2486 const char* s = str;
2487 size_t slen;
2488 size_t dlen = 0; /* number of hexdigits parsed */
2489
2490 /* just a hex string with optional dots? */
2491 if (s[0] != '0' || s[1] != 'x')
2492 return LDNS_WIREPARSE_ERR_INVALID_STR;
2493 s += 2;
2494 slen = strlen(s);
2495 if(slen > LDNS_MAX_RDFLEN*2)
2496 return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
2497 while(*s) {
2498 if(isspace((unsigned char)*s) || *s == '.') {
2499 s++;
2500 continue;
2501 }
2502 if(!isxdigit((unsigned char)*s))
2503 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
2504 if(*len < dlen/2 + 1)
2505 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
2506 s-str);
2507 if((dlen&1)==0)
2508 rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
2509 else rd[dlen/2] += sldns_hexdigit_to_int(*s++);
2510 dlen++;
2511 }
2512 if((dlen&1)!=0)
2513 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
2514 *len = dlen/2;
2515 return LDNS_WIREPARSE_ERR_OK;
2516 }
2517
sldns_str2wire_atma_buf(const char * str,uint8_t * rd,size_t * len)2518 int sldns_str2wire_atma_buf(const char* str, uint8_t* rd, size_t* len)
2519 {
2520 const char* s = str;
2521 size_t slen = strlen(str);
2522 size_t dlen = 0; /* number of hexdigits parsed */
2523
2524 /* just a hex string with optional dots? */
2525 /* notimpl e.164 format */
2526 if(slen > LDNS_MAX_RDFLEN*2)
2527 return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
2528 while(*s) {
2529 if(isspace((unsigned char)*s) || *s == '.') {
2530 s++;
2531 continue;
2532 }
2533 if(!isxdigit((unsigned char)*s))
2534 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
2535 if(*len < dlen/2 + 1)
2536 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
2537 s-str);
2538 if((dlen&1)==0)
2539 rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
2540 else rd[dlen/2] += sldns_hexdigit_to_int(*s++);
2541 dlen++;
2542 }
2543 if((dlen&1)!=0)
2544 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
2545 *len = dlen/2;
2546 return LDNS_WIREPARSE_ERR_OK;
2547 }
2548
sldns_str2wire_ipseckey_buf(const char * str,uint8_t * rd,size_t * len)2549 int sldns_str2wire_ipseckey_buf(const char* str, uint8_t* rd, size_t* len)
2550 {
2551 size_t gwlen = 0, keylen = 0;
2552 int s;
2553 uint8_t gwtype;
2554 char token[512];
2555 sldns_buffer strbuf;
2556 sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
2557
2558 if(*len < 3)
2559 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2560 /* precedence */
2561 if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
2562 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2563 sldns_buffer_position(&strbuf));
2564 rd[0] = (uint8_t)atoi(token);
2565 /* gateway_type */
2566 if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
2567 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2568 sldns_buffer_position(&strbuf));
2569 rd[1] = (uint8_t)atoi(token);
2570 gwtype = rd[1];
2571 /* algorithm */
2572 if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
2573 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2574 sldns_buffer_position(&strbuf));
2575 rd[2] = (uint8_t)atoi(token);
2576
2577 /* gateway */
2578 if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
2579 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2580 sldns_buffer_position(&strbuf));
2581 if(gwtype == 0) {
2582 /* NOGATEWAY */
2583 if(strcmp(token, ".") != 0)
2584 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2585 sldns_buffer_position(&strbuf));
2586 gwlen = 0;
2587 } else if(gwtype == 1) {
2588 /* IP4 */
2589 gwlen = *len - 3;
2590 s = sldns_str2wire_a_buf(token, rd+3, &gwlen);
2591 if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
2592 } else if(gwtype == 2) {
2593 /* IP6 */
2594 gwlen = *len - 3;
2595 s = sldns_str2wire_aaaa_buf(token, rd+3, &gwlen);
2596 if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
2597 } else if(gwtype == 3) {
2598 /* DNAME */
2599 gwlen = *len - 3;
2600 s = sldns_str2wire_dname_buf(token, rd+3, &gwlen);
2601 if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
2602 } else {
2603 /* unknown gateway type */
2604 return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
2605 sldns_buffer_position(&strbuf));
2606 }
2607 /* double check for size */
2608 if(*len < 3 + gwlen)
2609 return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
2610 sldns_buffer_position(&strbuf));
2611
2612 /* publickey in remainder of strbuf */
2613 keylen = *len - 3 - gwlen;
2614 s = sldns_str2wire_b64_buf((const char*)sldns_buffer_current(&strbuf),
2615 rd+3+gwlen, &keylen);
2616 if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
2617
2618 *len = 3 + gwlen + keylen;
2619 return LDNS_WIREPARSE_ERR_OK;
2620 }
2621
sldns_str2wire_nsec3_salt_buf(const char * str,uint8_t * rd,size_t * len)2622 int sldns_str2wire_nsec3_salt_buf(const char* str, uint8_t* rd, size_t* len)
2623 {
2624 int i, salt_length_str = (int)strlen(str);
2625 if (salt_length_str == 1 && str[0] == '-') {
2626 salt_length_str = 0;
2627 } else if (salt_length_str % 2 != 0) {
2628 return LDNS_WIREPARSE_ERR_SYNTAX_HEX;
2629 }
2630 if (salt_length_str > 512)
2631 return LDNS_WIREPARSE_ERR_SYNTAX_HEX;
2632 if(*len < 1+(size_t)salt_length_str / 2)
2633 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2634 rd[0] = (uint8_t) (salt_length_str / 2);
2635 for (i = 0; i < salt_length_str; i += 2) {
2636 if (isxdigit((unsigned char)str[i]) &&
2637 isxdigit((unsigned char)str[i+1])) {
2638 rd[1+i/2] = (uint8_t)(sldns_hexdigit_to_int(str[i])*16
2639 + sldns_hexdigit_to_int(str[i+1]));
2640 } else {
2641 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, i);
2642 }
2643 }
2644 *len = 1 + (size_t)rd[0];
2645 return LDNS_WIREPARSE_ERR_OK;
2646 }
2647
sldns_str2wire_ilnp64_buf(const char * str,uint8_t * rd,size_t * len)2648 int sldns_str2wire_ilnp64_buf(const char* str, uint8_t* rd, size_t* len)
2649 {
2650 unsigned int a, b, c, d;
2651 uint16_t shorts[4];
2652 int l;
2653 if(*len < sizeof(shorts))
2654 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2655
2656 if (sscanf(str, "%4x:%4x:%4x:%4x%n", &a, &b, &c, &d, &l) != 4 ||
2657 l != (int)strlen(str) || /* more data to read */
2658 strpbrk(str, "+-") /* signed hexes */
2659 )
2660 return LDNS_WIREPARSE_ERR_SYNTAX_ILNP64;
2661 shorts[0] = htons(a);
2662 shorts[1] = htons(b);
2663 shorts[2] = htons(c);
2664 shorts[3] = htons(d);
2665 memmove(rd, &shorts, sizeof(shorts));
2666 *len = sizeof(shorts);
2667 return LDNS_WIREPARSE_ERR_OK;
2668 }
2669
sldns_str2wire_eui48_buf(const char * str,uint8_t * rd,size_t * len)2670 int sldns_str2wire_eui48_buf(const char* str, uint8_t* rd, size_t* len)
2671 {
2672 unsigned int a, b, c, d, e, f;
2673 int l;
2674
2675 if(*len < 6)
2676 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2677 if (sscanf(str, "%2x-%2x-%2x-%2x-%2x-%2x%n",
2678 &a, &b, &c, &d, &e, &f, &l) != 6 ||
2679 l != (int)strlen(str))
2680 return LDNS_WIREPARSE_ERR_SYNTAX_EUI48;
2681 rd[0] = a;
2682 rd[1] = b;
2683 rd[2] = c;
2684 rd[3] = d;
2685 rd[4] = e;
2686 rd[5] = f;
2687 *len = 6;
2688 return LDNS_WIREPARSE_ERR_OK;
2689 }
2690
sldns_str2wire_eui64_buf(const char * str,uint8_t * rd,size_t * len)2691 int sldns_str2wire_eui64_buf(const char* str, uint8_t* rd, size_t* len)
2692 {
2693 unsigned int a, b, c, d, e, f, g, h;
2694 int l;
2695
2696 if(*len < 8)
2697 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2698 if (sscanf(str, "%2x-%2x-%2x-%2x-%2x-%2x-%2x-%2x%n",
2699 &a, &b, &c, &d, &e, &f, &g, &h, &l) != 8 ||
2700 l != (int)strlen(str))
2701 return LDNS_WIREPARSE_ERR_SYNTAX_EUI64;
2702 rd[0] = a;
2703 rd[1] = b;
2704 rd[2] = c;
2705 rd[3] = d;
2706 rd[4] = e;
2707 rd[5] = f;
2708 rd[6] = g;
2709 rd[7] = h;
2710 *len = 8;
2711 return LDNS_WIREPARSE_ERR_OK;
2712 }
2713
sldns_str2wire_tag_buf(const char * str,uint8_t * rd,size_t * len)2714 int sldns_str2wire_tag_buf(const char* str, uint8_t* rd, size_t* len)
2715 {
2716 size_t slen = strlen(str);
2717 const char* ptr;
2718
2719 if (slen > 255)
2720 return LDNS_WIREPARSE_ERR_SYNTAX_TAG;
2721 if(*len < slen+1)
2722 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2723 for (ptr = str; *ptr; ptr++) {
2724 if(!isalnum((unsigned char)*ptr))
2725 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TAG, ptr-str);
2726 }
2727 rd[0] = (uint8_t)slen;
2728 memmove(rd+1, str, slen);
2729 *len = slen+1;
2730 return LDNS_WIREPARSE_ERR_OK;
2731 }
2732
sldns_str2wire_long_str_buf(const char * str,uint8_t * rd,size_t * len)2733 int sldns_str2wire_long_str_buf(const char* str, uint8_t* rd, size_t* len)
2734 {
2735 uint8_t ch = 0;
2736 const char* pstr = str;
2737 size_t length = 0;
2738
2739 /* Fill data with parsed bytes */
2740 while (sldns_parse_char(&ch, &pstr)) {
2741 if(*len < length+1)
2742 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2743 rd[length++] = ch;
2744 }
2745 if(!pstr)
2746 return LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE;
2747 *len = length;
2748 return LDNS_WIREPARSE_ERR_OK;
2749 }
2750
sldns_str2wire_hip_buf(const char * str,uint8_t * rd,size_t * len)2751 int sldns_str2wire_hip_buf(const char* str, uint8_t* rd, size_t* len)
2752 {
2753 char* s, *end;
2754 int e;
2755 size_t hitlen, pklen = 0;
2756 /* presentation format:
2757 * pk-algo HIThex pubkeybase64
2758 * wireformat:
2759 * hitlen[1byte] pkalgo[1byte] pubkeylen[2byte] [hit] [pubkey] */
2760 if(*len < 4)
2761 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2762
2763 /* read PK algorithm */
2764 rd[1] = (uint8_t)strtol((char*)str, &s, 10);
2765 if(*s != ' ')
2766 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, s-(char*)str);
2767 s++;
2768 while(*s == ' ')
2769 s++;
2770
2771 /* read HIT hex tag */
2772 /* zero terminate the tag (replace later) */
2773 end = strchr(s, ' ');
2774 if(!end) return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX, s-(char*)str);
2775 *end = 0;
2776 hitlen = *len - 4;
2777 if((e = sldns_str2wire_hex_buf(s, rd+4, &hitlen)) != 0) {
2778 *end = ' ';
2779 return RET_ERR_SHIFT(e, s-(char*)str);
2780 }
2781 if(hitlen > 255) {
2782 *end = ' ';
2783 return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, s-(char*)str+255*2);
2784 }
2785 rd[0] = (uint8_t)hitlen;
2786 *end = ' ';
2787 s = end+1;
2788
2789 /* read pubkey base64 sequence */
2790 pklen = *len - 4 - hitlen;
2791 if((e = sldns_str2wire_b64_buf(s, rd+4+hitlen, &pklen)) != 0)
2792 return RET_ERR_SHIFT(e, s-(char*)str);
2793 if(pklen > 65535)
2794 return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, s-(char*)str+65535);
2795 sldns_write_uint16(rd+2, (uint16_t)pklen);
2796
2797 *len = 4 + hitlen + pklen;
2798 return LDNS_WIREPARSE_ERR_OK;
2799 }
2800
sldns_str2wire_int16_data_buf(const char * str,uint8_t * rd,size_t * len)2801 int sldns_str2wire_int16_data_buf(const char* str, uint8_t* rd, size_t* len)
2802 {
2803 char* s;
2804 int n;
2805 n = strtol(str, &s, 10);
2806 if(n < 0) /* negative number not allowed */
2807 return LDNS_WIREPARSE_ERR_SYNTAX;
2808 if(*len < ((size_t)n)+2)
2809 return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
2810 if(n > 65535)
2811 return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
2812
2813 if(n == 0) {
2814 sldns_write_uint16(rd, 0);
2815 *len = 2;
2816 return LDNS_WIREPARSE_ERR_OK;
2817 }
2818 if(*s != ' ')
2819 return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, s-(char*)str);
2820 s++;
2821 while(*s == ' ')
2822 s++;
2823
2824 n = sldns_b64_pton(s, rd+2, (*len)-2);
2825 if(n < 0)
2826 return LDNS_WIREPARSE_ERR_SYNTAX_B64;
2827 sldns_write_uint16(rd, (uint16_t)n);
2828 *len = ((size_t)n)+2;
2829 return LDNS_WIREPARSE_ERR_OK;
2830 }
2831