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 */ 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 } 139 140 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 } 144 145 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 } 170 171 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 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 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 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 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 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* 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 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 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 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 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 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 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 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 } 628 629 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 */ 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 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 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 } 945 946 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 } 953 954 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 } 961 962 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 } 968 969 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 } 975 976 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 } 982 983 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 } 989 990 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 } 996 997 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 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 * 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 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 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 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 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 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 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 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 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* 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 */ 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 */ 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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