contrib/unbound/sldns/wire2str.c

   1 /*
   2  * wire2str.c
   3  *
   4  * conversion routines from the wire format
   5  * to the presentation format (strings)
   6  *
   7  * (c) NLnet Labs, 2004-2006
   8  *
   9  * See the file LICENSE for the license
  10  */
  11 /**
  12  * \file
  13  *
  14  * Contains functions to translate the wireformat to text
  15  * representation, as well as functions to print them.
  16  */
  17 #include "config.h"
  18 #include "sldns/wire2str.h"
  19 #include "sldns/str2wire.h"
  20 #include "sldns/rrdef.h"
  21 #include "sldns/pkthdr.h"
  22 #include "sldns/parseutil.h"
  23 #include "sldns/sbuffer.h"
  24 #include "sldns/keyraw.h"
  25 #ifdef HAVE_TIME_H
  26 #include <time.h>
  27 #endif
  28 #include <sys/time.h>
  29 #include <stdarg.h>
  30 #include <ctype.h>
  31 #ifdef HAVE_NETDB_H
  32 #include <netdb.h>
  33 #endif
  34
  35 /* lookup tables for standard DNS stuff  */
  36 /* Taken from RFC 2535, section 7.  */
  37 static sldns_lookup_table sldns_algorithms_data[] = {
  38         { LDNS_RSAMD5, "RSAMD5" },
  39         { LDNS_DH, "DH" },
  40         { LDNS_DSA, "DSA" },
  41         { LDNS_ECC, "ECC" },
  42         { LDNS_RSASHA1, "RSASHA1" },
  43         { LDNS_DSA_NSEC3, "DSA-NSEC3-SHA1" },
  44         { LDNS_RSASHA1_NSEC3, "RSASHA1-NSEC3-SHA1" },
  45         { LDNS_RSASHA256, "RSASHA256"},
  46         { LDNS_RSASHA512, "RSASHA512"},
  47         { LDNS_ECC_GOST, "ECC-GOST"},
  48         { LDNS_ECDSAP256SHA256, "ECDSAP256SHA256"},
  49         { LDNS_ECDSAP384SHA384, "ECDSAP384SHA384"},
  50         { LDNS_INDIRECT, "INDIRECT" },
  51         { LDNS_PRIVATEDNS, "PRIVATEDNS" },
  52         { LDNS_PRIVATEOID, "PRIVATEOID" },
  53         { 0, NULL }
  54 };
  55 sldns_lookup_table* sldns_algorithms = sldns_algorithms_data;
  56
  57 /* hash algorithms in DS record */
  58 static sldns_lookup_table sldns_hashes_data[] = {
  59         { LDNS_SHA1, "SHA1" },
  60         { LDNS_SHA256, "SHA256" },
  61         { LDNS_HASH_GOST, "HASH-GOST" },
  62         { LDNS_SHA384, "SHA384" },
  63         { 0, NULL }
  64 };
  65 sldns_lookup_table* sldns_hashes = sldns_hashes_data;
  66
  67 /* Taken from RFC 4398  */
  68 static sldns_lookup_table sldns_cert_algorithms_data[] = {
  69         { LDNS_CERT_PKIX, "PKIX" },
  70         { LDNS_CERT_SPKI, "SPKI" },
  71         { LDNS_CERT_PGP, "PGP" },
  72         { LDNS_CERT_IPKIX, "IPKIX" },
  73         { LDNS_CERT_ISPKI, "ISPKI" },
  74         { LDNS_CERT_IPGP, "IPGP" },
  75         { LDNS_CERT_ACPKIX, "ACPKIX" },
  76         { LDNS_CERT_IACPKIX, "IACPKIX" },
  77         { LDNS_CERT_URI, "URI" },
  78         { LDNS_CERT_OID, "OID" },
  79         { 0, NULL }
  80 };
  81 sldns_lookup_table* sldns_cert_algorithms = sldns_cert_algorithms_data;
  82
  83 /* if these are used elsewhere */
  84 static sldns_lookup_table sldns_rcodes_data[] = {
  85         { LDNS_RCODE_NOERROR, "NOERROR" },
  86         { LDNS_RCODE_FORMERR, "FORMERR" },
  87         { LDNS_RCODE_SERVFAIL, "SERVFAIL" },
  88         { LDNS_RCODE_NXDOMAIN, "NXDOMAIN" },
  89         { LDNS_RCODE_NOTIMPL, "NOTIMPL" },
  90         { LDNS_RCODE_REFUSED, "REFUSED" },
  91         { LDNS_RCODE_YXDOMAIN, "YXDOMAIN" },
  92         { LDNS_RCODE_YXRRSET, "YXRRSET" },
  93         { LDNS_RCODE_NXRRSET, "NXRRSET" },
  94         { LDNS_RCODE_NOTAUTH, "NOTAUTH" },
  95         { LDNS_RCODE_NOTZONE, "NOTZONE" },
  96         { 0, NULL }
  97 };
  98 sldns_lookup_table* sldns_rcodes = sldns_rcodes_data;
  99
 100 static sldns_lookup_table sldns_opcodes_data[] = {
 101         { LDNS_PACKET_QUERY, "QUERY" },
 102         { LDNS_PACKET_IQUERY, "IQUERY" },
 103         { LDNS_PACKET_STATUS, "STATUS" },
 104         { LDNS_PACKET_NOTIFY, "NOTIFY" },
 105         { LDNS_PACKET_UPDATE, "UPDATE" },
 106         { 0, NULL }
 107 };
 108 sldns_lookup_table* sldns_opcodes = sldns_opcodes_data;
 109
 110 static sldns_lookup_table sldns_wireparse_errors_data[] = {
 111         { LDNS_WIREPARSE_ERR_OK, "no parse error" },
 112         { LDNS_WIREPARSE_ERR_GENERAL, "parse error" },
 113         { LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, "Domainname length overflow" },
 114         { LDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, "Domainname length underflow (zero length)" },
 115         { LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, "buffer too small" },
 116         { LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, "Label length overflow" },
 117         { LDNS_WIREPARSE_ERR_EMPTY_LABEL, "Empty label" },
 118         { LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE, "Syntax error, bad escape sequence" },
 119         { LDNS_WIREPARSE_ERR_SYNTAX, "Syntax error, could not parse the RR" },
 120         { LDNS_WIREPARSE_ERR_SYNTAX_TTL, "Syntax error, could not parse the RR's TTL" },
 121         { LDNS_WIREPARSE_ERR_SYNTAX_TYPE, "Syntax error, could not parse the RR's type" },
 122         { LDNS_WIREPARSE_ERR_SYNTAX_CLASS, "Syntax error, could not parse the RR's class" },
 123         { LDNS_WIREPARSE_ERR_SYNTAX_RDATA, "Syntax error, could not parse the RR's rdata" },
 124         { LDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE, "Syntax error, value expected" },
 125         { LDNS_WIREPARSE_ERR_INVALID_STR, "Conversion error, string expected" },
 126         { LDNS_WIREPARSE_ERR_SYNTAX_B64, "Conversion error, b64 encoding expected" },
 127         { LDNS_WIREPARSE_ERR_SYNTAX_B32_EXT, "Conversion error, b32 ext encoding expected" },
 128         { LDNS_WIREPARSE_ERR_SYNTAX_HEX, "Conversion error, hex encoding expected" },
 129         { LDNS_WIREPARSE_ERR_CERT_BAD_ALGORITHM, "Bad algorithm type for CERT record" },
 130         { LDNS_WIREPARSE_ERR_SYNTAX_TIME, "Conversion error, time encoding expected" },
 131         { LDNS_WIREPARSE_ERR_SYNTAX_PERIOD, "Conversion error, time period encoding expected" },
 132         { LDNS_WIREPARSE_ERR_SYNTAX_ILNP64, "Conversion error, 4 colon separated hex numbers expected" },
 133         { LDNS_WIREPARSE_ERR_SYNTAX_EUI48,
 134                 "Conversion error, 6 two character hex numbers "
 135                 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx" },
 136         { LDNS_WIREPARSE_ERR_SYNTAX_EUI64,
 137                 "Conversion error, 8 two character hex numbers "
 138                 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx-xx-xx" },
 139         { LDNS_WIREPARSE_ERR_SYNTAX_TAG,
 140                 "Conversion error, a non-zero sequence of US-ASCII letters "
 141                 "and numbers in lower case expected" },
 142         { LDNS_WIREPARSE_ERR_NOT_IMPL, "not implemented" },
 143         { LDNS_WIREPARSE_ERR_SYNTAX_INT, "Conversion error, integer expected" },
 144         { LDNS_WIREPARSE_ERR_SYNTAX_IP4, "Conversion error, ip4 addr expected" },
 145         { LDNS_WIREPARSE_ERR_SYNTAX_IP6, "Conversion error, ip6 addr expected" },
 146         { LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW, "Syntax error, integer overflow" },
 147         { LDNS_WIREPARSE_ERR_INCLUDE, "$INCLUDE directive was seen in the zone" },
 148         { LDNS_WIREPARSE_ERR_PARENTHESIS, "Parse error, parenthesis mismatch" },
 149         { 0, NULL }
 150 };
 151 sldns_lookup_table* sldns_wireparse_errors = sldns_wireparse_errors_data;
 152
 153 static sldns_lookup_table sldns_edns_flags_data[] = {
 154         { 3600, "do"},
 155         { 0, NULL}
 156 };
 157 sldns_lookup_table* sldns_edns_flags = sldns_edns_flags_data;
 158
 159 static sldns_lookup_table sldns_edns_options_data[] = {
 160         { 1, "LLQ" },
 161         { 2, "UL" },
 162         { 3, "NSID" },
 163         /* 4 draft-cheshire-edns0-owner-option */
 164         { 5, "DAU" },
 165         { 6, "DHU" },
 166         { 7, "N3U" },
 167         { 8, "edns-client-subnet" },
 168         { 12, "Padding" },
 169         { 0, NULL}
 170 };
 171 sldns_lookup_table* sldns_edns_options = sldns_edns_options_data;
 172
 173 char* sldns_wire2str_pkt(uint8_t* data, size_t len)
 174 {
 175         size_t slen = (size_t)sldns_wire2str_pkt_buf(data, len, NULL, 0);
 176         char* result = (char*)malloc(slen+1);
 177         if(!result) return NULL;
 178         sldns_wire2str_pkt_buf(data, len, result, slen+1);
 179         return result;
 180 }
 181
 182 char* sldns_wire2str_rr(uint8_t* rr, size_t len)
 183 {
 184         size_t slen = (size_t)sldns_wire2str_rr_buf(rr, len, NULL, 0);
 185         char* result = (char*)malloc(slen+1);
 186         if(!result) return NULL;
 187         sldns_wire2str_rr_buf(rr, len, result, slen+1);
 188         return result;
 189 }
 190
 191 char* sldns_wire2str_type(uint16_t rrtype)
 192 {
 193         char buf[16];
 194         sldns_wire2str_type_buf(rrtype, buf, sizeof(buf));
 195         return strdup(buf);
 196 }
 197
 198 char* sldns_wire2str_class(uint16_t rrclass)
 199 {
 200         char buf[16];
 201         sldns_wire2str_class_buf(rrclass, buf, sizeof(buf));
 202         return strdup(buf);
 203 }
 204
 205 char* sldns_wire2str_dname(uint8_t* dname, size_t dname_len)
 206 {
 207         size_t slen=(size_t)sldns_wire2str_dname_buf(dname, dname_len, NULL, 0);
 208         char* result = (char*)malloc(slen+1);
 209         if(!result) return NULL;
 210         sldns_wire2str_dname_buf(dname, dname_len, result, slen+1);
 211         return result;
 212 }
 213
 214 char* sldns_wire2str_rcode(int rcode)
 215 {
 216         char buf[16];
 217         sldns_wire2str_rcode_buf(rcode, buf, sizeof(buf));
 218         return strdup(buf);
 219 }
 220
 221 int sldns_wire2str_pkt_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 222 {
 223         /* use arguments as temporary variables */
 224         return sldns_wire2str_pkt_scan(&d, &dlen, &s, &slen);
 225 }
 226
 227 int sldns_wire2str_rr_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 228 {
 229         /* use arguments as temporary variables */
 230         return sldns_wire2str_rr_scan(&d, &dlen, &s, &slen, NULL, 0);
 231 }
 232
 233 int sldns_wire2str_rdata_buf(uint8_t* rdata, size_t rdata_len, char* str,
 234         size_t str_len, uint16_t rrtype)
 235 {
 236         /* use arguments as temporary variables */
 237         return sldns_wire2str_rdata_scan(&rdata, &rdata_len, &str, &str_len,
 238                 rrtype, NULL, 0);
 239 }
 240
 241 int sldns_wire2str_rr_unknown_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 242 {
 243         /* use arguments as temporary variables */
 244         return sldns_wire2str_rr_unknown_scan(&d, &dlen, &s, &slen, NULL, 0);
 245 }
 246
 247 int sldns_wire2str_rr_comment_buf(uint8_t* rr, size_t rrlen, size_t dname_len,
 248         char* s, size_t slen)
 249 {
 250         uint16_t rrtype = sldns_wirerr_get_type(rr, rrlen, dname_len);
 251         return sldns_wire2str_rr_comment_print(&s, &slen, rr, rrlen, dname_len,
 252                 rrtype);
 253 }
 254
 255 int sldns_wire2str_type_buf(uint16_t rrtype, char* s, size_t slen)
 256 {
 257         /* use arguments as temporary variables */
 258         return sldns_wire2str_type_print(&s, &slen, rrtype);
 259 }
 260
 261 int sldns_wire2str_class_buf(uint16_t rrclass, char* s, size_t slen)
 262 {
 263         /* use arguments as temporary variables */
 264         return sldns_wire2str_class_print(&s, &slen, rrclass);
 265 }
 266
 267 int sldns_wire2str_rcode_buf(int rcode, char* s, size_t slen)
 268 {
 269         /* use arguments as temporary variables */
 270         return sldns_wire2str_rcode_print(&s, &slen, rcode);
 271 }
 272
 273 int sldns_wire2str_dname_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 274 {
 275         /* use arguments as temporary variables */
 276         return sldns_wire2str_dname_scan(&d, &dlen, &s, &slen, NULL, 0);
 277 }
 278
 279 int sldns_str_vprint(char** str, size_t* slen, const char* format, va_list args)
 280 {
 281         int w = vsnprintf(*str, *slen, format, args);
 282         if(w < 0) {
 283                 /* error in printout */
 284                 return 0;
 285         } else if((size_t)w >= *slen) {
 286                 *str = NULL; /* we do not want str to point outside of buffer*/
 287                 *slen = 0;
 288         } else {
 289                 *str += w;
 290                 *slen -= w;
 291         }
 292         return w;
 293 }
 294
 295 int sldns_str_print(char** str, size_t* slen, const char* format, ...)
 296 {
 297         int w;
 298         va_list args;
 299         va_start(args, format);
 300         w = sldns_str_vprint(str, slen, format, args);
 301         va_end(args);
 302         return w;
 303 }
 304
 305 /** print hex format into text buffer for specified length */
 306 static int print_hex_buf(char** s, size_t* slen, uint8_t* buf, size_t len)
 307 {
 308         const char* hex = "0123456789ABCDEF";
 309         size_t i;
 310         for(i=0; i<len; i++) {
 311                 (void)sldns_str_print(s, slen, "%c%c", hex[(buf[i]&0xf0)>>4],
 312                         hex[buf[i]&0x0f]);
 313         }
 314         return (int)len*2;
 315 }
 316
 317 /** print remainder of buffer in hex format with prefixed text */
 318 static int print_remainder_hex(const char* pref, uint8_t** d, size_t* dlen,
 319         char** s, size_t* slen)
 320 {
 321         int w = 0;
 322         w += sldns_str_print(s, slen, "%s", pref);
 323         w += print_hex_buf(s, slen, *d, *dlen);
 324         *d += *dlen;
 325         *dlen = 0;
 326         return w;
 327 }
 328
 329 int sldns_wire2str_pkt_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 330 {
 331         int w = 0;
 332         unsigned qdcount, ancount, nscount, arcount, i;
 333         uint8_t* pkt = *d;
 334         size_t pktlen = *dlen;
 335         if(*dlen >= LDNS_HEADER_SIZE) {
 336                 qdcount = (unsigned)LDNS_QDCOUNT(*d);
 337                 ancount = (unsigned)LDNS_ANCOUNT(*d);
 338                 nscount = (unsigned)LDNS_NSCOUNT(*d);
 339                 arcount = (unsigned)LDNS_ARCOUNT(*d);
 340         } else {
 341                 qdcount = ancount = nscount = arcount = 0;
 342         }
 343         w += sldns_wire2str_header_scan(d, dlen, s, slen);
 344         w += sldns_str_print(s, slen, "\n");
 345         w += sldns_str_print(s, slen, ";; QUESTION SECTION:\n");
 346         for(i=0; i<qdcount; i++) {
 347                 w += sldns_wire2str_rrquestion_scan(d, dlen, s, slen,
 348                         pkt, pktlen);
 349                 if(!*dlen) break;
 350         }
 351         w += sldns_str_print(s, slen, "\n");
 352         w += sldns_str_print(s, slen, ";; ANSWER SECTION:\n");
 353         for(i=0; i<ancount; i++) {
 354                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 355                 if(!*dlen) break;
 356         }
 357         w += sldns_str_print(s, slen, "\n");
 358         w += sldns_str_print(s, slen, ";; AUTHORITY SECTION:\n");
 359         for(i=0; i<nscount; i++) {
 360                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 361                 if(!*dlen) break;
 362         }
 363         w += sldns_str_print(s, slen, "\n");
 364         w += sldns_str_print(s, slen, ";; ADDITIONAL SECTION:\n");
 365         for(i=0; i<arcount; i++) {
 366                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 367                 if(!*dlen) break;
 368         }
 369         /* other fields: WHEN(time), SERVER(IP) not available here. */
 370         w += sldns_str_print(s, slen, ";; MSG SIZE  rcvd: %d\n", (int)pktlen);
 371         if(*dlen > 0) {
 372                 w += print_remainder_hex(";; trailing garbage 0x",
 373                         d, dlen, s, slen);
 374                 w += sldns_str_print(s, slen, "\n");
 375         }
 376         return w;
 377 }
 378
 379 /** scan type, class and ttl and printout, for rr */
 380 static int sldns_rr_tcttl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
 381 {
 382         int w = 0;
 383         uint16_t t, c;
 384         uint32_t ttl;
 385         if(*dl < 8) {
 386                 if(*dl < 4)
 387                         return w + print_remainder_hex("; Error malformed 0x",
 388                                 d, dl, s, sl);
 389                 /* these print values or 0x.. if none left */
 390                 t = sldns_read_uint16(*d);
 391                 c = sldns_read_uint16((*d)+2);
 392                 (*d)+=4;
 393                 (*dl)-=4;
 394                 w += sldns_wire2str_class_print(s, sl, c);
 395                 w += sldns_str_print(s, sl, "\t");
 396                 w += sldns_wire2str_type_print(s, sl, t);
 397                 if(*dl == 0)
 398                         return w + sldns_str_print(s, sl, "; Error no ttl");
 399                 return w + print_remainder_hex(
 400                         "; Error malformed ttl 0x", d, dl, s, sl);
 401         }
 402         t = sldns_read_uint16(*d);
 403         c = sldns_read_uint16((*d)+2);
 404         ttl = sldns_read_uint32((*d)+4);
 405         (*d)+=8;
 406         (*dl)-=8;
 407         w += sldns_str_print(s, sl, "%lu\t", (unsigned long)ttl);
 408         w += sldns_wire2str_class_print(s, sl, c);
 409         w += sldns_str_print(s, sl, "\t");
 410         w += sldns_wire2str_type_print(s, sl, t);
 411         return w;
 412 }
 413
 414 int sldns_wire2str_rr_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 415         uint8_t* pkt, size_t pktlen)
 416 {
 417         int w = 0;
 418         uint8_t* rr = *d;
 419         size_t rrlen = *dlen, dname_off, rdlen, ordlen;
 420         uint16_t rrtype = 0;
 421
 422         if(*dlen >= 3 && (*d)[0]==0 &&
 423                 sldns_read_uint16((*d)+1)==LDNS_RR_TYPE_OPT) {
 424                 /* perform EDNS OPT processing */
 425                 return sldns_wire2str_edns_scan(d, dlen, s, slen, pkt, pktlen);
 426         }
 427
 428         /* try to scan the rdata with pretty-printing, but if that fails, then
 429          * scan the rdata as an unknown RR type */
 430         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 431         w += sldns_str_print(s, slen, "\t");
 432         dname_off = rrlen-(*dlen);
 433         if(*dlen == 4) {
 434                 /* like a question-RR */
 435                 uint16_t t = sldns_read_uint16(*d);
 436                 uint16_t c = sldns_read_uint16((*d)+2);
 437                 (*d)+=4;
 438                 (*dlen)-=4;
 439                 w += sldns_wire2str_class_print(s, slen, c);
 440                 w += sldns_str_print(s, slen, "\t");
 441                 w += sldns_wire2str_type_print(s, slen, t);
 442                 w += sldns_str_print(s, slen, " ; Error no ttl,rdata\n");
 443                 return w;
 444         }
 445         if(*dlen < 8) {
 446                 if(*dlen == 0)
 447                         return w + sldns_str_print(s, slen, ";Error missing RR\n");
 448                 w += print_remainder_hex(";Error partial RR 0x", d, dlen, s, slen);
 449                 return w + sldns_str_print(s, slen, "\n");
 450         }
 451         rrtype = sldns_read_uint16(*d);
 452         w += sldns_rr_tcttl_scan(d, dlen, s, slen);
 453         w += sldns_str_print(s, slen, "\t");
 454
 455         /* rdata */
 456         if(*dlen < 2) {
 457                 if(*dlen == 0)
 458                         return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
 459                 w += print_remainder_hex(";Error missing rdatalen 0x",
 460                         d, dlen, s, slen);
 461                 return w + sldns_str_print(s, slen, "\n");
 462         }
 463         rdlen = sldns_read_uint16(*d);
 464         ordlen = rdlen;
 465         (*d)+=2;
 466         (*dlen)-=2;
 467         if(*dlen < rdlen) {
 468                 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
 469                 if(*dlen == 0)
 470                         return w + sldns_str_print(s, slen, ";Error missing rdata\n");
 471                 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
 472                 return w + sldns_str_print(s, slen, "\n");
 473         }
 474         w += sldns_wire2str_rdata_scan(d, &rdlen, s, slen, rrtype, pkt, pktlen);
 475         (*dlen) -= (ordlen-rdlen);
 476
 477         /* default comment */
 478         w += sldns_wire2str_rr_comment_print(s, slen, rr, rrlen, dname_off,
 479                 rrtype);
 480         w += sldns_str_print(s, slen, "\n");
 481         return w;
 482 }
 483
 484 int sldns_wire2str_rrquestion_scan(uint8_t** d, size_t* dlen, char** s,
 485         size_t* slen, uint8_t* pkt, size_t pktlen)
 486 {
 487         int w = 0;
 488         uint16_t t, c;
 489         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 490         w += sldns_str_print(s, slen, "\t");
 491         if(*dlen < 4) {
 492                 if(*dlen == 0)
 493                         return w + sldns_str_print(s, slen, "Error malformed\n");
 494                 w += print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 495                 return w + sldns_str_print(s, slen, "\n");
 496         }
 497         t = sldns_read_uint16(*d);
 498         c = sldns_read_uint16((*d)+2);
 499         (*d)+=4;
 500         (*dlen)-=4;
 501         w += sldns_wire2str_class_print(s, slen, c);
 502         w += sldns_str_print(s, slen, "\t");
 503         w += sldns_wire2str_type_print(s, slen, t);
 504         w += sldns_str_print(s, slen, "\n");
 505         return w;
 506 }
 507
 508 int sldns_wire2str_rr_unknown_scan(uint8_t** d, size_t* dlen, char** s,
 509         size_t* slen, uint8_t* pkt, size_t pktlen)
 510 {
 511         size_t rdlen, ordlen;
 512         int w = 0;
 513         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 514         w += sldns_str_print(s, slen, "\t");
 515         w += sldns_rr_tcttl_scan(d, dlen, s, slen);
 516         w += sldns_str_print(s, slen, "\t");
 517         if(*dlen < 2) {
 518                 if(*dlen == 0)
 519                         return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
 520                 w += print_remainder_hex(";Error missing rdatalen 0x",
 521                         d, dlen, s, slen);
 522                 return w + sldns_str_print(s, slen, "\n");
 523         }
 524         rdlen = sldns_read_uint16(*d);
 525         ordlen = rdlen;
 526         (*d) += 2;
 527         (*dlen) -= 2;
 528         if(*dlen < rdlen) {
 529                 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
 530                 if(*dlen == 0)
 531                         return w + sldns_str_print(s, slen, ";Error missing rdata\n");
 532                 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
 533                 return w + sldns_str_print(s, slen, "\n");
 534         }
 535         w += sldns_wire2str_rdata_unknown_scan(d, &rdlen, s, slen);
 536         (*dlen) -= (ordlen-rdlen);
 537         w += sldns_str_print(s, slen, "\n");
 538         return w;
 539 }
 540
 541 /** print rr comment for type DNSKEY */
 542 static int rr_comment_dnskey(char** s, size_t* slen, uint8_t* rr,
 543         size_t rrlen, size_t dname_off)
 544 {
 545         size_t rdlen;
 546         uint8_t* rdata;
 547         int flags, w = 0;
 548         if(rrlen < dname_off + 10) return 0;
 549         rdlen = sldns_read_uint16(rr+dname_off+8);
 550         if(rrlen < dname_off + 10 + rdlen) return 0;
 551         rdata = rr + dname_off + 10;
 552         flags = (int)sldns_read_uint16(rdata);
 553         w += sldns_str_print(s, slen, " ;{");
 554
 555         /* id */
 556         w += sldns_str_print(s, slen, "id = %u",
 557                 sldns_calc_keytag_raw(rdata, rdlen));
 558
 559         /* flags */
 560         if((flags&LDNS_KEY_ZONE_KEY)) {
 561                 if((flags&LDNS_KEY_SEP_KEY))
 562                         w += sldns_str_print(s, slen, " (ksk)");
 563                 else    w += sldns_str_print(s, slen, " (zsk)");
 564         }
 565
 566         /* keysize */
 567         if(rdlen > 4) {
 568                 w += sldns_str_print(s, slen, ", ");
 569                 w += sldns_str_print(s, slen, "size = %db",
 570                         (int)sldns_rr_dnskey_key_size_raw(
 571                         (unsigned char*)rdata+4, rdlen-4, (int)(rdata[3])));
 572         }
 573
 574         w += sldns_str_print(s, slen, "}");
 575         return w;
 576 }
 577
 578 /** print rr comment for type RRSIG */
 579 static int rr_comment_rrsig(char** s, size_t* slen, uint8_t* rr,
 580         size_t rrlen, size_t dname_off)
 581 {
 582         size_t rdlen;
 583         uint8_t* rdata;
 584         if(rrlen < dname_off + 10) return 0;
 585         rdlen = sldns_read_uint16(rr+dname_off+8);
 586         if(rrlen < dname_off + 10 + rdlen) return 0;
 587         rdata = rr + dname_off + 10;
 588         if(rdlen < 18) return 0;
 589         return sldns_str_print(s, slen, " ;{id = %d}",
 590                 (int)sldns_read_uint16(rdata+16));
 591 }
 592
 593 /** print rr comment for type NSEC3 */
 594 static int rr_comment_nsec3(char** s, size_t* slen, uint8_t* rr,
 595         size_t rrlen, size_t dname_off)
 596 {
 597         size_t rdlen;
 598         uint8_t* rdata;
 599         int w = 0;
 600         if(rrlen < dname_off + 10) return 0;
 601         rdlen = sldns_read_uint16(rr+dname_off+8);
 602         if(rrlen < dname_off + 10 + rdlen) return 0;
 603         rdata = rr + dname_off + 10;
 604         if(rdlen < 2) return 0;
 605         if((rdata[1] & LDNS_NSEC3_VARS_OPTOUT_MASK))
 606                 w += sldns_str_print(s, slen, " ;{flags: optout}");
 607         return w;
 608 }
 609
 610 int sldns_wire2str_rr_comment_print(char** s, size_t* slen, uint8_t* rr,
 611         size_t rrlen, size_t dname_off, uint16_t rrtype)
 612 {
 613         if(rrtype == LDNS_RR_TYPE_DNSKEY) {
 614                 return rr_comment_dnskey(s, slen, rr, rrlen, dname_off);
 615         } else if(rrtype == LDNS_RR_TYPE_RRSIG) {
 616                 return rr_comment_rrsig(s, slen, rr, rrlen, dname_off);
 617         } else if(rrtype == LDNS_RR_TYPE_NSEC3) {
 618                 return rr_comment_nsec3(s, slen, rr, rrlen, dname_off);
 619         }
 620         return 0;
 621 }
 622
 623 int sldns_wire2str_header_scan(uint8_t** d, size_t* dlen, char** s,
 624         size_t* slen)
 625 {
 626         int w = 0;
 627         int opcode, rcode;
 628         w += sldns_str_print(s, slen, ";; ->>HEADER<<- ");
 629         if(*dlen == 0)
 630                 return w+sldns_str_print(s, slen, "Error empty packet");
 631         if(*dlen < 4)
 632                 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
 633         opcode = (int)LDNS_OPCODE_WIRE(*d);
 634         rcode = (int)LDNS_RCODE_WIRE(*d);
 635         w += sldns_str_print(s, slen, "opcode: ");
 636         w += sldns_wire2str_opcode_print(s, slen, opcode);
 637         w += sldns_str_print(s, slen, ", ");
 638         w += sldns_str_print(s, slen, "rcode: ");
 639         w += sldns_wire2str_rcode_print(s, slen, rcode);
 640         w += sldns_str_print(s, slen, ", ");
 641         w += sldns_str_print(s, slen, "id: %d\n", (int)LDNS_ID_WIRE(*d));
 642         w += sldns_str_print(s, slen, ";; flags:");
 643         if(LDNS_QR_WIRE(*d)) w += sldns_str_print(s, slen, " qr");
 644         if(LDNS_AA_WIRE(*d)) w += sldns_str_print(s, slen, " aa");
 645         if(LDNS_TC_WIRE(*d)) w += sldns_str_print(s, slen, " tc");
 646         if(LDNS_RD_WIRE(*d)) w += sldns_str_print(s, slen, " rd");
 647         if(LDNS_CD_WIRE(*d)) w += sldns_str_print(s, slen, " cd");
 648         if(LDNS_RA_WIRE(*d)) w += sldns_str_print(s, slen, " ra");
 649         if(LDNS_AD_WIRE(*d)) w += sldns_str_print(s, slen, " ad");
 650         if(LDNS_Z_WIRE(*d))  w += sldns_str_print(s, slen, " z");
 651         w += sldns_str_print(s, slen, " ; ");
 652         if(*dlen < LDNS_HEADER_SIZE)
 653                 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
 654         w += sldns_str_print(s, slen, "QUERY: %d, ", (int)LDNS_QDCOUNT(*d));
 655         w += sldns_str_print(s, slen, "ANSWER: %d, ", (int)LDNS_ANCOUNT(*d));
 656         w += sldns_str_print(s, slen, "AUTHORITY: %d, ", (int)LDNS_NSCOUNT(*d));
 657         w += sldns_str_print(s, slen, "ADDITIONAL: %d ", (int)LDNS_ARCOUNT(*d));
 658         *d += LDNS_HEADER_SIZE;
 659         *dlen -= LDNS_HEADER_SIZE;
 660         return w;
 661 }
 662
 663 int sldns_wire2str_rdata_scan(uint8_t** d, size_t* dlen, char** s,
 664         size_t* slen, uint16_t rrtype, uint8_t* pkt, size_t pktlen)
 665 {
 666         /* try to prettyprint, but if that fails, use unknown format */
 667         uint8_t* origd = *d;
 668         char* origs = *s;
 669         size_t origdlen = *dlen, origslen = *slen;
 670         uint16_t r_cnt, r_max;
 671         sldns_rdf_type rdftype;
 672         int w = 0, n;
 673
 674         const sldns_rr_descriptor *desc = sldns_rr_descript(rrtype);
 675         if(!desc) /* unknown format */
 676                 return sldns_wire2str_rdata_unknown_scan(d, dlen, s, slen);
 677         /* dlen equals the rdatalen for the rdata */
 678
 679         r_max = sldns_rr_descriptor_maximum(desc);
 680         for(r_cnt=0; r_cnt < r_max; r_cnt++) {
 681                 if(*dlen == 0) {
 682                         if(r_cnt < sldns_rr_descriptor_minimum(desc))
 683                                 goto failed;
 684                         break; /* nothing more to print */
 685                 }
 686                 rdftype = sldns_rr_descriptor_field_type(desc, r_cnt);
 687                 if(r_cnt != 0)
 688                         w += sldns_str_print(s, slen, " ");
 689                 n = sldns_wire2str_rdf_scan(d, dlen, s, slen, rdftype,
 690                         pkt, pktlen);
 691                 if(n == -1) {
 692                 failed:
 693                         /* failed, use unknown format */
 694                         *d = origd; *s = origs;
 695                         *dlen = origdlen; *slen = origslen;
 696                         return sldns_wire2str_rdata_unknown_scan(d, dlen,
 697                                 s, slen);
 698                 }
 699                 w += n;
 700         }
 701         if(*dlen != 0) {
 702                 goto failed;
 703         }
 704         return w;
 705 }
 706
 707 int sldns_wire2str_rdata_unknown_scan(uint8_t** d, size_t* dlen, char** s,
 708         size_t* slen)
 709 {
 710         int w = 0;
 711
 712         /* print length */
 713         w += sldns_str_print(s, slen, "\\# %u", (unsigned)*dlen);
 714
 715         /* print rdlen in hex */
 716         if(*dlen != 0)
 717                 w += sldns_str_print(s, slen, " ");
 718         w += print_hex_buf(s, slen, *d, *dlen);
 719         (*d) += *dlen;
 720         (*dlen) = 0;
 721         return w;
 722 }
 723
 724 /** print and escape one character for a domain dname */
 725 static int dname_char_print(char** s, size_t* slen, uint8_t c)
 726 {
 727         if(c == '.' || c == ';' || c == '(' || c == ')' || c == '\\')
 728                 return sldns_str_print(s, slen, "\\%c", c);
 729         else if(!(isascii((unsigned char)c) && isgraph((unsigned char)c)))
 730                 return sldns_str_print(s, slen, "\\%03u", (unsigned)c);
 731         /* plain printout */
 732         if(*slen) {
 733                 **s = (char)c;
 734                 (*s)++;
 735                 (*slen)--;
 736         }
 737         return 1;
 738 }
 739
 740 int sldns_wire2str_dname_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 741         uint8_t* pkt, size_t pktlen)
 742 {
 743         int w = 0;
 744         /* spool labels onto the string, use compression if its there */
 745         uint8_t* pos = *d;
 746         unsigned i, counter=0;
 747         const unsigned maxcompr = 1000; /* loop detection, max compr ptrs */
 748         int in_buf = 1;
 749         if(*dlen == 0) return sldns_str_print(s, slen, "ErrorMissingDname");
 750         if(*pos == 0) {
 751                 (*d)++;
 752                 (*dlen)--;
 753                 return sldns_str_print(s, slen, ".");
 754         }
 755         while(*pos) {
 756                 /* read label length */
 757                 uint8_t labellen = *pos++;
 758                 if(in_buf) { (*d)++; (*dlen)--; }
 759
 760                 /* find out what sort of label we have */
 761                 if((labellen&0xc0) == 0xc0) {
 762                         /* compressed */
 763                         uint16_t target = 0;
 764                         if(in_buf && *dlen == 0)
 765                                 return w + sldns_str_print(s, slen,
 766                                         "ErrorPartialDname");
 767                         else if(!in_buf && pos+1 > pkt+pktlen)
 768                                 return w + sldns_str_print(s, slen,
 769                                         "ErrorPartialDname");
 770                         target = ((labellen&0x3f)<<8) | *pos;
 771                         if(in_buf) { (*d)++; (*dlen)--; }
 772                         /* move to target, if possible */
 773                         if(!pkt || target >= pktlen)
 774                                 return w + sldns_str_print(s, slen,
 775                                         "ErrorComprPtrOutOfBounds");
 776                         if(counter++ > maxcompr)
 777                                 return w + sldns_str_print(s, slen,
 778                                         "ErrorComprPtrLooped");
 779                         in_buf = 0;
 780                         pos = pkt+target;
 781                         continue;
 782                 } else if((labellen&0xc0)) {
 783                         /* notimpl label type */
 784                         w += sldns_str_print(s, slen,
 785                                 "ErrorLABELTYPE%xIsUnknown",
 786                                 (int)(labellen&0xc0));
 787                         return w;
 788                 }
 789
 790                 /* spool label characters, end with '.' */
 791                 if(in_buf && *dlen < labellen) labellen = *dlen;
 792                 else if(!in_buf && pos+labellen > pkt+pktlen)
 793                         labellen = (uint8_t)(pkt + pktlen - pos);
 794                 for(i=0; i<(unsigned)labellen; i++) {
 795                         w += dname_char_print(s, slen, *pos++);
 796                 }
 797                 if(in_buf) {
 798                         (*d) += labellen;
 799                         (*dlen) -= labellen;
 800                         if(*dlen == 0) break;
 801                 }
 802                 w += sldns_str_print(s, slen, ".");
 803         }
 804         /* skip over final root label */
 805         if(in_buf && *dlen > 0) { (*d)++; (*dlen)--; }
 806         /* in case we printed no labels, terminate dname */
 807         if(w == 0) w += sldns_str_print(s, slen, ".");
 808         return w;
 809 }
 810
 811 int sldns_wire2str_opcode_print(char** s, size_t* slen, int opcode)
 812 {
 813         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_opcodes, opcode);
 814         if (lt && lt->name) {
 815                 return sldns_str_print(s, slen, "%s", lt->name);
 816         }
 817         return sldns_str_print(s, slen, "OPCODE%u", (unsigned)opcode);
 818 }
 819
 820 int sldns_wire2str_rcode_print(char** s, size_t* slen, int rcode)
 821 {
 822         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rcodes, rcode);
 823         if (lt && lt->name) {
 824                 return sldns_str_print(s, slen, "%s", lt->name);
 825         }
 826         return sldns_str_print(s, slen, "RCODE%u", (unsigned)rcode);
 827 }
 828
 829 int sldns_wire2str_class_print(char** s, size_t* slen, uint16_t rrclass)
 830 {
 831         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rr_classes,
 832                 (int)rrclass);
 833         if (lt && lt->name) {
 834                 return sldns_str_print(s, slen, "%s", lt->name);
 835         }
 836         return sldns_str_print(s, slen, "CLASS%u", (unsigned)rrclass);
 837 }
 838
 839 int sldns_wire2str_type_print(char** s, size_t* slen, uint16_t rrtype)
 840 {
 841         const sldns_rr_descriptor *descriptor = sldns_rr_descript(rrtype);
 842         if (descriptor && descriptor->_name) {
 843                 return sldns_str_print(s, slen, "%s", descriptor->_name);
 844         }
 845         return sldns_str_print(s, slen, "TYPE%u", (unsigned)rrtype);
 846 }
 847
 848 int sldns_wire2str_edns_option_code_print(char** s, size_t* slen,
 849         uint16_t opcode)
 850 {
 851         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_edns_options,
 852                 (int)opcode);
 853         if (lt && lt->name) {
 854                 return sldns_str_print(s, slen, "%s", lt->name);
 855         }
 856         return sldns_str_print(s, slen, "OPT%u", (unsigned)opcode);
 857 }
 858
 859 int sldns_wire2str_class_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 860 {
 861         uint16_t c;
 862         if(*dlen == 0) return 0;
 863         if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 864         c = sldns_read_uint16(*d);
 865         (*d)+=2;
 866         (*dlen)-=2;
 867         return sldns_wire2str_class_print(s, slen, c);
 868 }
 869
 870 int sldns_wire2str_type_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 871 {
 872         uint16_t t;
 873         if(*dlen == 0) return 0;
 874         if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 875         t = sldns_read_uint16(*d);
 876         (*d)+=2;
 877         (*dlen)-=2;
 878         return sldns_wire2str_type_print(s, slen, t);
 879 }
 880
 881 int sldns_wire2str_ttl_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 882 {
 883         uint32_t ttl;
 884         if(*dlen == 0) return 0;
 885         if(*dlen < 4) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 886         ttl = sldns_read_uint32(*d);
 887         (*d)+=4;
 888         (*dlen)-=4;
 889         return sldns_str_print(s, slen, "%u", (unsigned)ttl);
 890 }
 891
 892 int sldns_wire2str_rdf_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 893         int rdftype, uint8_t* pkt, size_t pktlen)
 894 {
 895         if(*dlen == 0) return 0;
 896         switch(rdftype) {
 897         case LDNS_RDF_TYPE_NONE:
 898                 return 0;
 899         case LDNS_RDF_TYPE_DNAME:
 900                 return sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 901         case LDNS_RDF_TYPE_INT8:
 902                 return sldns_wire2str_int8_scan(d, dlen, s, slen);
 903         case LDNS_RDF_TYPE_INT16:
 904                 return sldns_wire2str_int16_scan(d, dlen, s, slen);
 905         case LDNS_RDF_TYPE_INT32:
 906                 return sldns_wire2str_int32_scan(d, dlen, s, slen);
 907         case LDNS_RDF_TYPE_PERIOD:
 908                 return sldns_wire2str_period_scan(d, dlen, s, slen);
 909         case LDNS_RDF_TYPE_TSIGTIME:
 910                 return sldns_wire2str_tsigtime_scan(d, dlen, s, slen);
 911         case LDNS_RDF_TYPE_A:
 912                 return sldns_wire2str_a_scan(d, dlen, s, slen);
 913         case LDNS_RDF_TYPE_AAAA:
 914                 return sldns_wire2str_aaaa_scan(d, dlen, s, slen);
 915         case LDNS_RDF_TYPE_STR:
 916                 return sldns_wire2str_str_scan(d, dlen, s, slen);
 917         case LDNS_RDF_TYPE_APL:
 918                 return sldns_wire2str_apl_scan(d, dlen, s, slen);
 919         case LDNS_RDF_TYPE_B32_EXT:
 920                 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
 921         case LDNS_RDF_TYPE_B64:
 922                 return sldns_wire2str_b64_scan(d, dlen, s, slen);
 923         case LDNS_RDF_TYPE_HEX:
 924                 return sldns_wire2str_hex_scan(d, dlen, s, slen);
 925         case LDNS_RDF_TYPE_NSEC:
 926                 return sldns_wire2str_nsec_scan(d, dlen, s, slen);
 927         case LDNS_RDF_TYPE_NSEC3_SALT:
 928                 return sldns_wire2str_nsec3_salt_scan(d, dlen, s, slen);
 929         case LDNS_RDF_TYPE_TYPE:
 930                 return sldns_wire2str_type_scan(d, dlen, s, slen);
 931         case LDNS_RDF_TYPE_CLASS:
 932                 return sldns_wire2str_class_scan(d, dlen, s, slen);
 933         case LDNS_RDF_TYPE_CERT_ALG:
 934                 return sldns_wire2str_cert_alg_scan(d, dlen, s, slen);
 935         case LDNS_RDF_TYPE_ALG:
 936                 return sldns_wire2str_alg_scan(d, dlen, s, slen);
 937         case LDNS_RDF_TYPE_UNKNOWN:
 938                 return sldns_wire2str_unknown_scan(d, dlen, s, slen);
 939         case LDNS_RDF_TYPE_TIME:
 940                 return sldns_wire2str_time_scan(d, dlen, s, slen);
 941         case LDNS_RDF_TYPE_LOC:
 942                 return sldns_wire2str_loc_scan(d, dlen, s, slen);
 943         case LDNS_RDF_TYPE_WKS:
 944         case LDNS_RDF_TYPE_SERVICE:
 945                 return sldns_wire2str_wks_scan(d, dlen, s, slen);
 946         case LDNS_RDF_TYPE_NSAP:
 947                 return sldns_wire2str_nsap_scan(d, dlen, s, slen);
 948         case LDNS_RDF_TYPE_ATMA:
 949                 return sldns_wire2str_atma_scan(d, dlen, s, slen);
 950         case LDNS_RDF_TYPE_IPSECKEY:
 951                 return sldns_wire2str_ipseckey_scan(d, dlen, s, slen, pkt,
 952                         pktlen);
 953         case LDNS_RDF_TYPE_HIP:
 954                 return sldns_wire2str_hip_scan(d, dlen, s, slen);
 955         case LDNS_RDF_TYPE_INT16_DATA:
 956                 return sldns_wire2str_int16_data_scan(d, dlen, s, slen);
 957         case LDNS_RDF_TYPE_NSEC3_NEXT_OWNER:
 958                 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
 959         case LDNS_RDF_TYPE_ILNP64:
 960                 return sldns_wire2str_ilnp64_scan(d, dlen, s, slen);
 961         case LDNS_RDF_TYPE_EUI48:
 962                 return sldns_wire2str_eui48_scan(d, dlen, s, slen);
 963         case LDNS_RDF_TYPE_EUI64:
 964                 return sldns_wire2str_eui64_scan(d, dlen, s, slen);
 965         case LDNS_RDF_TYPE_TAG:
 966                 return sldns_wire2str_tag_scan(d, dlen, s, slen);
 967         case LDNS_RDF_TYPE_LONG_STR:
 968                 return sldns_wire2str_long_str_scan(d, dlen, s, slen);
 969         }
 970         /* unknown rdf type */
 971         return -1;
 972 }
 973
 974 int sldns_wire2str_int8_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
 975 {
 976         int w;
 977         if(*dl < 1) return -1;
 978         w = sldns_str_print(s, sl, "%u", (unsigned)**d);
 979         (*d)++;
 980         (*dl)--;
 981         return w;
 982 }
 983
 984 int sldns_wire2str_int16_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
 985 {
 986         int w;
 987         if(*dl < 2) return -1;
 988         w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint16(*d));
 989         (*d)+=2;
 990         (*dl)-=2;
 991         return w;
 992 }
 993
 994 int sldns_wire2str_int32_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
 995 {
 996         int w;
 997         if(*dl < 4) return -1;
 998         w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint32(*d));
 999         (*d)+=4;
1000         (*dl)-=4;
1001         return w;
1002 }
1003
1004 int sldns_wire2str_period_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1005 {
1006         int w;
1007         if(*dl < 4) return -1;
1008         w = sldns_str_print(s, sl, "%u", (unsigned)sldns_read_uint32(*d));
1009         (*d)+=4;
1010         (*dl)-=4;
1011         return w;
1012 }
1013
1014 int sldns_wire2str_tsigtime_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1015 {
1016         /* tsigtime is 48 bits network order unsigned integer */
1017         int w;
1018         uint64_t tsigtime = 0;
1019         uint64_t d0, d1, d2, d3, d4, d5;
1020         if(*dl < 6) return -1;
1021         d0 = (*d)[0]; /* cast to uint64 for shift operations */
1022         d1 = (*d)[1];
1023         d2 = (*d)[2];
1024         d3 = (*d)[3];
1025         d4 = (*d)[4];
1026         d5 = (*d)[5];
1027         tsigtime = (d0<<40) | (d1<<32) | (d2<<24) | (d3<<16) | (d4<<8) | d5;
1028 #ifndef USE_WINSOCK
1029         w = sldns_str_print(s, sl, "%llu", (long long)tsigtime);
1030 #else
1031         w = sldns_str_print(s, sl, "%I64u", (long long)tsigtime);
1032 #endif
1033         (*d)+=6;
1034         (*dl)-=6;
1035         return w;
1036 }
1037
1038 int sldns_wire2str_a_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1039 {
1040         char buf[32];
1041         int w;
1042         if(*dl < 4) return -1;
1043         if(!inet_ntop(AF_INET, *d, buf, (socklen_t)sizeof(buf)))
1044                 return -1;
1045         w = sldns_str_print(s, sl, "%s", buf);
1046         (*d)+=4;
1047         (*dl)-=4;
1048         return w;
1049 }
1050
1051 int sldns_wire2str_aaaa_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1052 {
1053 #ifdef AF_INET6
1054         char buf[64];
1055         int w;
1056         if(*dl < 16) return -1;
1057         if(!inet_ntop(AF_INET6, *d, buf, (socklen_t)sizeof(buf)))
1058                 return -1;
1059         w = sldns_str_print(s, sl, "%s", buf);
1060         (*d)+=16;
1061         (*dl)-=16;
1062         return w;
1063 #else
1064         return -1;
1065 #endif
1066 }
1067
1068 /** printout escaped TYPE_STR character */
1069 static int str_char_print(char** s, size_t* sl, uint8_t c)
1070 {
1071         if(isprint((unsigned char)c) || c == '\t') {
1072                 if(c == '\"' || c == '\\')
1073                         return sldns_str_print(s, sl, "\\%c", c);
1074                 if(*sl) {
1075                         **s = (char)c;
1076                         (*s)++;
1077                         (*sl)--;
1078                 }
1079                 return 1;
1080         }
1081         return sldns_str_print(s, sl, "\\%03u", (unsigned)c);
1082 }
1083
1084 int sldns_wire2str_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1085 {
1086         int w = 0;
1087         size_t i, len;
1088         if(*dl < 1) return -1;
1089         len = **d;
1090         if(*dl < 1+len) return -1;
1091         (*d)++;
1092         (*dl)--;
1093         w += sldns_str_print(s, sl, "\"");
1094         for(i=0; i<len; i++)
1095                 w += str_char_print(s, sl, (*d)[i]);
1096         w += sldns_str_print(s, sl, "\"");
1097         (*d)+=len;
1098         (*dl)-=len;
1099         return w;
1100 }
1101
1102 int sldns_wire2str_apl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1103 {
1104         int i, w = 0;
1105         uint16_t family;
1106         uint8_t negation, prefix, adflength;
1107         if(*dl < 4) return -1;
1108         family = sldns_read_uint16(*d);
1109         prefix = (*d)[2];
1110         negation = ((*d)[3] & LDNS_APL_NEGATION);
1111         adflength = ((*d)[3] & LDNS_APL_MASK);
1112         if(*dl < 4+(size_t)adflength) return -1;
1113         if(family != LDNS_APL_IP4 && family != LDNS_APL_IP6)
1114                 return -1; /* unknown address family */
1115         if(negation)
1116                 w += sldns_str_print(s, sl, "!");
1117         w += sldns_str_print(s, sl, "%u:", (unsigned)family);
1118         if(family == LDNS_APL_IP4) {
1119                 /* check if prefix <32 ? */
1120                 /* address is variable length 0 - 4 */
1121                 for(i=0; i<4; i++) {
1122                         if(i > 0)
1123                                 w += sldns_str_print(s, sl, ".");
1124                         if(i < (int)adflength)
1125                                 w += sldns_str_print(s, sl, "%d", (*d)[4+i]);
1126                         else    w += sldns_str_print(s, sl, "0");
1127                 }
1128         } else if(family == LDNS_APL_IP6) {
1129                 /* check if prefix <128 ? */
1130                 /* address is variable length 0 - 16 */
1131                 for(i=0; i<16; i++) {
1132                         if(i%2 == 0 && i>0)
1133                                 w += sldns_str_print(s, sl, ":");
1134                         if(i < (int)adflength)
1135                                 w += sldns_str_print(s, sl, "%02x", (*d)[4+i]);
1136                         else    w += sldns_str_print(s, sl, "00");
1137                 }
1138         }
1139         w += sldns_str_print(s, sl, "/%u", (unsigned)prefix);
1140         (*d) += 4+adflength;
1141         (*dl) -= 4+adflength;
1142         return w;
1143 }
1144
1145 int sldns_wire2str_b32_ext_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1146 {
1147         size_t datalen;
1148         size_t sz;
1149         if(*dl < 1) return -1;
1150         datalen = (*d)[0];
1151         if(*dl < 1+datalen) return -1;
1152         sz = sldns_b32_ntop_calculate_size(datalen);
1153         if(*sl < sz+1) {
1154                 (*d) += datalen+1;
1155                 (*dl) -= (datalen+1);
1156                 return (int)sz; /* out of space really, but would need buffer
1157                         in order to truncate the output */
1158         }
1159         sldns_b32_ntop_extended_hex((*d)+1, datalen, *s, *sl);
1160         (*d) += datalen+1;
1161         (*dl) -= (datalen+1);
1162         (*s) += sz;
1163         (*sl) -= sz;
1164         return (int)sz;
1165 }
1166
1167 /** scan number of bytes from wire into b64 presentation format */
1168 static int sldns_wire2str_b64_scan_num(uint8_t** d, size_t* dl, char** s,
1169         size_t* sl, size_t num)
1170 {
1171         /* b64_ntop_calculate size includes null at the end */
1172         size_t sz = sldns_b64_ntop_calculate_size(num)-1;
1173         if(*sl < sz+1) {
1174                 (*d) += num;
1175                 (*dl) -= num;
1176                 return (int)sz; /* out of space really, but would need buffer
1177                         in order to truncate the output */
1178         }
1179         sldns_b64_ntop(*d, num, *s, *sl);
1180         (*d) += num;
1181         (*dl) -= num;
1182         (*s) += sz;
1183         (*sl) -= sz;
1184         return (int)sz;
1185 }
1186
1187 int sldns_wire2str_b64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1188 {
1189         return sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1190 }
1191
1192 int sldns_wire2str_hex_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1193 {
1194         return print_remainder_hex("", d, dl, s, sl);
1195 }
1196
1197 int sldns_wire2str_nsec_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1198 {
1199         uint8_t* p = *d;
1200         size_t pl = *dl;
1201         unsigned i, bit, window, block_len;
1202         uint16_t t;
1203         int w = 0;
1204
1205         /* check for errors */
1206         while(pl) {
1207                 if(pl < 2) return -1;
1208                 block_len = (unsigned)p[1];
1209                 if(pl < 2+block_len) return -1;
1210                 p += block_len+2;
1211                 pl -= block_len+2;
1212         }
1213
1214         /* do it */
1215         p = *d;
1216         pl = *dl;
1217         while(pl) {
1218                 if(pl < 2) return -1; /* cannot happen */
1219                 window = (unsigned)p[0];
1220                 block_len = (unsigned)p[1];
1221                 if(pl < 2+block_len) return -1; /* cannot happen */
1222                 p += 2;
1223                 for(i=0; i<block_len; i++) {
1224                         if(p[i] == 0) continue;
1225                         /* base type number for this octet */
1226                         t = ((window)<<8) | (i << 3);
1227                         for(bit=0; bit<8; bit++) {
1228                                 if((p[i]&(0x80>>bit))) {
1229                                         if(w) w += sldns_str_print(s, sl, " ");
1230                                         w += sldns_wire2str_type_print(s, sl,
1231                                                 t+bit);
1232                                 }
1233                         }
1234                 }
1235                 p += block_len;
1236                 pl -= block_len+2;
1237         }
1238         (*d) += *dl;
1239         (*dl) = 0;
1240         return w;
1241 }
1242
1243 int sldns_wire2str_nsec3_salt_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1244 {
1245         size_t salt_len;
1246         int w;
1247         if(*dl < 1) return -1;
1248         salt_len = (size_t)(*d)[0];
1249         if(*dl < 1+salt_len) return -1;
1250         (*d)++;
1251         (*dl)--;
1252         if(salt_len == 0) {
1253                 return sldns_str_print(s, sl, "-");
1254         }
1255         w = print_hex_buf(s, sl, *d, salt_len);
1256         (*dl)-=salt_len;
1257         (*d)+=salt_len;
1258         return w;
1259 }
1260
1261 int sldns_wire2str_cert_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1262 {
1263         sldns_lookup_table *lt;
1264         int data, w;
1265         if(*dl < 2) return -1;
1266         data = (int)sldns_read_uint16(*d);
1267         lt = sldns_lookup_by_id(sldns_cert_algorithms, data);
1268         if(lt && lt->name)
1269                 w = sldns_str_print(s, sl, "%s", lt->name);
1270         else    w = sldns_str_print(s, sl, "%d", data);
1271         (*dl)-=2;
1272         (*d)+=2;
1273         return w;
1274 }
1275
1276 int sldns_wire2str_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1277 {
1278         /* don't use algorithm mnemonics in the presentation format
1279          * this kind of got sneaked into the rfc's */
1280         return sldns_wire2str_int8_scan(d, dl, s, sl);
1281 }
1282
1283 int sldns_wire2str_unknown_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1284 {
1285         return sldns_wire2str_rdata_unknown_scan(d, dl, s, sl);
1286 }
1287
1288 int sldns_wire2str_time_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1289 {
1290         /* create a YYYYMMDDHHMMSS string if possible */
1291         struct tm tm;
1292         char date_buf[16];
1293         uint32_t t;
1294         memset(&tm, 0, sizeof(tm));
1295         if(*dl < 4) return -1;
1296         t = sldns_read_uint32(*d);
1297         date_buf[15]=0;
1298         if(sldns_serial_arithmitics_gmtime_r(t, time(NULL), &tm) &&
1299                 strftime(date_buf, 15, "%Y%m%d%H%M%S", &tm)) {
1300                 (*d) += 4;
1301                 (*dl) -= 4;
1302                 return sldns_str_print(s, sl, "%s", date_buf);
1303         }
1304         return -1;
1305 }
1306
1307 static int
1308 loc_cm_print(char** str, size_t* sl, uint8_t mantissa, uint8_t exponent)
1309 {
1310         int w = 0;
1311         uint8_t i;
1312         /* is it 0.<two digits> ? */
1313         if(exponent < 2) {
1314                 if(exponent == 1)
1315                         mantissa *= 10;
1316                 return sldns_str_print(str, sl, "0.%02ld", (long)mantissa);
1317         }
1318         /* always <digit><string of zeros> */
1319         w += sldns_str_print(str, sl, "%d", (int)mantissa);
1320         for(i=0; i<exponent-2; i++)
1321                 w += sldns_str_print(str, sl, "0");
1322         return w;
1323 }
1324
1325 int sldns_wire2str_loc_scan(uint8_t** d, size_t* dl, char** str, size_t* sl)
1326 {
1327         /* we could do checking (ie degrees < 90 etc)? */
1328         uint8_t version;
1329         uint8_t size;
1330         uint8_t horizontal_precision;
1331         uint8_t vertical_precision;
1332         uint32_t longitude;
1333         uint32_t latitude;
1334         uint32_t altitude;
1335         char northerness;
1336         char easterness;
1337         uint32_t h;
1338         uint32_t m;
1339         double s;
1340         uint32_t equator = (uint32_t)1 << 31; /* 2**31 */
1341         int w = 0;
1342
1343         if(*dl < 16) return -1;
1344         version = (*d)[0];
1345         if(version != 0)
1346                 return sldns_wire2str_hex_scan(d, dl, str, sl);
1347         size = (*d)[1];
1348         horizontal_precision = (*d)[2];
1349         vertical_precision = (*d)[3];
1350
1351         latitude = sldns_read_uint32((*d)+4);
1352         longitude = sldns_read_uint32((*d)+8);
1353         altitude = sldns_read_uint32((*d)+12);
1354
1355         if (latitude > equator) {
1356                 northerness = 'N';
1357                 latitude = latitude - equator;
1358         } else {
1359                 northerness = 'S';
1360                 latitude = equator - latitude;
1361         }
1362         h = latitude / (1000 * 60 * 60);
1363         latitude = latitude % (1000 * 60 * 60);
1364         m = latitude / (1000 * 60);
1365         latitude = latitude % (1000 * 60);
1366         s = (double) latitude / 1000.0;
1367         w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1368                 h, m, s, northerness);
1369
1370         if (longitude > equator) {
1371                 easterness = 'E';
1372                 longitude = longitude - equator;
1373         } else {
1374                 easterness = 'W';
1375                 longitude = equator - longitude;
1376         }
1377         h = longitude / (1000 * 60 * 60);
1378         longitude = longitude % (1000 * 60 * 60);
1379         m = longitude / (1000 * 60);
1380         longitude = longitude % (1000 * 60);
1381         s = (double) longitude / (1000.0);
1382         w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1383                 h, m, s, easterness);
1384
1385         s = ((double) altitude) / 100;
1386         s -= 100000;
1387
1388         if(altitude%100 != 0)
1389                 w += sldns_str_print(str, sl, "%.2f", s);
1390         else
1391                 w += sldns_str_print(str, sl, "%.0f", s);
1392
1393         w += sldns_str_print(str, sl, "m ");
1394
1395         w += loc_cm_print(str, sl, (size & 0xf0) >> 4, size & 0x0f);
1396         w += sldns_str_print(str, sl, "m ");
1397
1398         w += loc_cm_print(str, sl, (horizontal_precision & 0xf0) >> 4,
1399                 horizontal_precision & 0x0f);
1400         w += sldns_str_print(str, sl, "m ");
1401
1402         w += loc_cm_print(str, sl, (vertical_precision & 0xf0) >> 4,
1403                 vertical_precision & 0x0f);
1404         w += sldns_str_print(str, sl, "m");
1405
1406         (*d)+=16;
1407         (*dl)-=16;
1408         return w;
1409 }
1410
1411 int sldns_wire2str_wks_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1412 {
1413         /* protocol, followed by bitmap of services */
1414         const char* proto_name = NULL;
1415         struct protoent *protocol;
1416         struct servent *service;
1417         uint8_t protocol_nr;
1418         int bit, port, w = 0;
1419         size_t i;
1420         /* we cannot print with strings because they
1421          * are not portable, the presentation format may
1422          * not be able to be read in on another computer.  */
1423         int print_symbols = 0;
1424
1425         /* protocol */
1426         if(*dl < 1) return -1;
1427         protocol_nr = (*d)[0];
1428         (*d)++;
1429         (*dl)--;
1430         protocol = getprotobynumber((int)protocol_nr);
1431         if(protocol && (protocol->p_name != NULL)) {
1432                 w += sldns_str_print(s, sl, "%s", protocol->p_name);
1433                 proto_name = protocol->p_name;
1434         } else  {
1435                 w += sldns_str_print(s, sl, "%u", (unsigned)protocol_nr);
1436         }
1437
1438         for(i=0; i<*dl; i++) {
1439                 if((*d)[i] == 0)
1440                         continue;
1441                 for(bit=0; bit<8; bit++) {
1442                         if(!(((*d)[i])&(0x80>>bit)))
1443                                 continue;
1444                         port = (int)i*8 + bit;
1445
1446                         if(!print_symbols)
1447                                 service = NULL;
1448                         else
1449                                 service = getservbyport(
1450                                         (int)htons((uint16_t)port), proto_name);
1451                         if(service && service->s_name)
1452                                 w += sldns_str_print(s, sl, " %s",
1453                                         service->s_name);
1454                         else    w += sldns_str_print(s, sl, " %u",
1455                                         (unsigned)port);
1456                 }
1457         }
1458
1459 #ifdef HAVE_ENDSERVENT
1460         endservent();
1461 #endif
1462 #ifdef HAVE_ENDPROTOENT
1463         endprotoent();
1464 #endif
1465         (*d) += *dl;
1466         (*dl) = 0;
1467         return w;
1468 }
1469
1470 int sldns_wire2str_nsap_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1471 {
1472         return print_remainder_hex("0x", d, dl, s, sl);
1473 }
1474
1475 int sldns_wire2str_atma_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1476 {
1477         return print_remainder_hex("", d, dl, s, sl);
1478 }
1479
1480 /* internal scan routine that can modify arguments on failure */
1481 static int sldns_wire2str_ipseckey_scan_internal(uint8_t** d, size_t* dl,
1482         char** s, size_t* sl, uint8_t* pkt, size_t pktlen)
1483 {
1484         /* http://www.ietf.org/internet-drafts/draft-ietf-ipseckey-rr-12.txt*/
1485         uint8_t precedence, gateway_type, algorithm;
1486         int w = 0;
1487
1488         if(*dl < 3) return -1;
1489         precedence = (*d)[0];
1490         gateway_type = (*d)[1];
1491         algorithm = (*d)[2];
1492         if(gateway_type > 3)
1493                 return -1; /* unknown */
1494         (*d)+=3;
1495         (*dl)-=3;
1496         w += sldns_str_print(s, sl, "%d %d %d ",
1497                 (int)precedence, (int)gateway_type, (int)algorithm);
1498
1499         switch(gateway_type) {
1500         case 0: /* no gateway */
1501                 w += sldns_str_print(s, sl, ".");
1502                 break;
1503         case 1: /* ip4 */
1504                 w += sldns_wire2str_a_scan(d, dl, s, sl);
1505                 break;
1506         case 2: /* ip6 */
1507                 w += sldns_wire2str_aaaa_scan(d, dl, s, sl);
1508                 break;
1509         case 3: /* dname */
1510                 w += sldns_wire2str_dname_scan(d, dl, s, sl, pkt, pktlen);
1511                 break;
1512         default: /* unknown */
1513                 return -1;
1514         }
1515
1516         if(*dl < 1)
1517                 return -1;
1518         w += sldns_str_print(s, sl, " ");
1519         w += sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1520         return w;
1521 }
1522
1523 int sldns_wire2str_ipseckey_scan(uint8_t** d, size_t* dl, char** s, size_t* sl,
1524         uint8_t* pkt, size_t pktlen)
1525 {
1526         uint8_t* od = *d;
1527         char* os = *s;
1528         size_t odl = *dl, osl = *sl;
1529         int w=sldns_wire2str_ipseckey_scan_internal(d, dl, s, sl, pkt, pktlen);
1530         if(w == -1) {
1531                 *d = od;
1532                 *s = os;
1533                 *dl = odl;
1534                 *sl = osl;
1535                 return -1;
1536         }
1537         return w;
1538 }
1539
1540 int sldns_wire2str_hip_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1541 {
1542         int w;
1543         uint8_t algo, hitlen;
1544         uint16_t pklen;
1545
1546         /* read lengths */
1547         if(*dl < 4)
1548                 return -1;
1549         hitlen = (*d)[0];
1550         algo = (*d)[1];
1551         pklen = sldns_read_uint16((*d)+2);
1552         if(*dl < (size_t)4 + (size_t)hitlen + (size_t)pklen)
1553                 return -1;
1554
1555         /* write: algo hit pubkey */
1556         w = sldns_str_print(s, sl, "%u ", (unsigned)algo);
1557         w += print_hex_buf(s, sl, (*d)+4, hitlen);
1558         w += sldns_str_print(s, sl, " ");
1559         (*d)+=4+hitlen;
1560         (*dl)-= (4+hitlen);
1561         w += sldns_wire2str_b64_scan_num(d, dl, s, sl, pklen);
1562         return w;
1563 }
1564
1565 int sldns_wire2str_int16_data_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1566 {
1567         uint16_t n;
1568         if(*dl < 2)
1569                 return -1;
1570         n = sldns_read_uint16(*d);
1571         if(*dl < 2+(size_t)n)
1572                 return -1;
1573         (*d)+=2;
1574         (*dl)-=2;
1575         return sldns_wire2str_b64_scan_num(d, dl, s, sl, n);
1576 }
1577
1578 int sldns_wire2str_nsec3_next_owner_scan(uint8_t** d, size_t* dl, char** s,
1579         size_t* sl)
1580 {
1581         return sldns_wire2str_b32_ext_scan(d, dl, s, sl);
1582 }
1583
1584 int sldns_wire2str_ilnp64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1585 {
1586         int w;
1587         if(*dl < 8)
1588                 return -1;
1589         w = sldns_str_print(s, sl, "%.4x:%.4x:%.4x:%.4x",
1590                 sldns_read_uint16(*d), sldns_read_uint16((*d)+2),
1591                 sldns_read_uint16((*d)+4), sldns_read_uint16((*d)+6));
1592         (*d)+=8;
1593         (*dl)-=8;
1594         return w;
1595 }
1596
1597 int sldns_wire2str_eui48_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1598 {
1599         int w;
1600         if(*dl < 6)
1601                 return -1;
1602         w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
1603                 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5]);
1604         (*d)+=6;
1605         (*dl)-=6;
1606         return w;
1607 }
1608
1609 int sldns_wire2str_eui64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1610 {
1611         int w;
1612         if(*dl < 8)
1613                 return -1;
1614         w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
1615                 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5],
1616                 (*d)[6], (*d)[7]);
1617         (*d)+=8;
1618         (*dl)-=8;
1619         return w;
1620 }
1621
1622 int sldns_wire2str_tag_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1623 {
1624         size_t i, n;
1625         int w = 0;
1626         if(*dl < 1)
1627                 return -1;
1628         n = (size_t)((*d)[0]);
1629         if(*dl < 1+n)
1630                 return -1;
1631         for(i=0; i<n; i++)
1632                 if(!isalnum((unsigned char)(*d)[i]))
1633                         return -1;
1634         for(i=0; i<n; i++)
1635                 w += sldns_str_print(s, sl, "%c", (char)(*d)[i]);
1636         (*d)+=n+1;
1637         (*dl)-=(n+1);
1638         return w;
1639 }
1640
1641 int sldns_wire2str_long_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1642 {
1643         size_t i;
1644         int w = 0;
1645         w += sldns_str_print(s, sl, "\"");
1646         for(i=0; i<*dl; i++)
1647                 w += str_char_print(s, sl, (*d)[i]);
1648         w += sldns_str_print(s, sl, "\"");
1649         (*d)+=*dl;
1650         (*dl)=0;
1651         return w;
1652 }
1653
1654 int sldns_wire2str_edns_llq_print(char** s, size_t* sl, uint8_t* data,
1655         size_t len)
1656 {
1657         /* LLQ constants */
1658         const char* llq_errors[] = {"NO-ERROR", "SERV-FULL", "STATIC",
1659                 "FORMAT-ERR", "NO-SUCH-LLQ", "BAD-VERS", "UNKNOWN_ERR"};
1660         const unsigned int llq_errors_num = 7;
1661         const char* llq_opcodes[] = {"LLQ-SETUP", "LLQ-REFRESH", "LLQ-EVENT"};
1662         const unsigned int llq_opcodes_num = 3;
1663         uint16_t version, llq_opcode, error_code;
1664         uint64_t llq_id;
1665         uint32_t lease_life; /* Requested or granted life of LLQ, in seconds */
1666         int w = 0;
1667
1668         /* read the record */
1669         if(len != 18) {
1670                 w += sldns_str_print(s, sl, "malformed LLQ ");
1671                 w += print_hex_buf(s, sl, data, len);
1672                 return w;
1673         }
1674         version = sldns_read_uint16(data);
1675         llq_opcode = sldns_read_uint16(data+2);
1676         error_code = sldns_read_uint16(data+4);
1677         memmove(&llq_id, data+6, sizeof(llq_id));
1678         lease_life = sldns_read_uint32(data+14);
1679
1680         /* print it */
1681         w += sldns_str_print(s, sl, "v%d ", (int)version);
1682         if(llq_opcode < llq_opcodes_num)
1683                 w += sldns_str_print(s, sl, "%s", llq_opcodes[llq_opcode]);
1684         else    w += sldns_str_print(s, sl, "opcode %d", (int)llq_opcode);
1685         if(error_code < llq_errors_num)
1686                 w += sldns_str_print(s, sl, " %s", llq_errors[error_code]);
1687         else    w += sldns_str_print(s, sl, " error %d", (int)error_code);
1688 #ifndef USE_WINSOCK
1689         w += sldns_str_print(s, sl, " id %llx lease-life %lu",
1690                 (unsigned long long)llq_id, (unsigned long)lease_life);
1691 #else
1692         w += sldns_str_print(s, sl, " id %I64x lease-life %lu",
1693                 (unsigned long long)llq_id, (unsigned long)lease_life);
1694 #endif
1695         return w;
1696 }
1697
1698 int sldns_wire2str_edns_ul_print(char** s, size_t* sl, uint8_t* data,
1699         size_t len)
1700 {
1701         uint32_t lease;
1702         int w = 0;
1703         if(len != 4) {
1704                 w += sldns_str_print(s, sl, "malformed UL ");
1705                 w += print_hex_buf(s, sl, data, len);
1706                 return w;
1707         }
1708         lease = sldns_read_uint32(data);
1709         w += sldns_str_print(s, sl, "lease %lu", (unsigned long)lease);
1710         return w;
1711 }
1712
1713 int sldns_wire2str_edns_nsid_print(char** s, size_t* sl, uint8_t* data,
1714         size_t len)
1715 {
1716         int w = 0;
1717         size_t i, printed=0;
1718         w += print_hex_buf(s, sl, data, len);
1719         for(i=0; i<len; i++) {
1720                 if(isprint((unsigned char)data[i]) || data[i] == '\t') {
1721                         if(!printed) {
1722                                 w += sldns_str_print(s, sl, " (");
1723                                 printed = 1;
1724                         }
1725                         w += sldns_str_print(s, sl, "%c", (char)data[i]);
1726                 }
1727         }
1728         if(printed)
1729                 w += sldns_str_print(s, sl, ")");
1730         return w;
1731 }
1732
1733 int sldns_wire2str_edns_dau_print(char** s, size_t* sl, uint8_t* data,
1734         size_t len)
1735 {
1736         sldns_lookup_table *lt;
1737         size_t i;
1738         int w = 0;
1739         for(i=0; i<len; i++) {
1740                 lt = sldns_lookup_by_id(sldns_algorithms, (int)data[i]);
1741                 if(lt && lt->name)
1742                         w += sldns_str_print(s, sl, " %s", lt->name);
1743                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1744         }
1745         return w;
1746 }
1747
1748 int sldns_wire2str_edns_dhu_print(char** s, size_t* sl, uint8_t* data,
1749         size_t len)
1750 {
1751         sldns_lookup_table *lt;
1752         size_t i;
1753         int w = 0;
1754         for(i=0; i<len; i++) {
1755                 lt = sldns_lookup_by_id(sldns_hashes, (int)data[i]);
1756                 if(lt && lt->name)
1757                         w += sldns_str_print(s, sl, " %s", lt->name);
1758                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1759         }
1760         return w;
1761 }
1762
1763 int sldns_wire2str_edns_n3u_print(char** s, size_t* sl, uint8_t* data,
1764         size_t len)
1765 {
1766         size_t i;
1767         int w = 0;
1768         for(i=0; i<len; i++) {
1769                 if(data[i] == 1)
1770                         w += sldns_str_print(s, sl, " SHA1");
1771                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1772         }
1773         return w;
1774 }
1775
1776 int sldns_wire2str_edns_subnet_print(char** s, size_t* sl, uint8_t* data,
1777         size_t len)
1778 {
1779         int w = 0;
1780         uint16_t family;
1781         uint8_t source, scope;
1782         if(len < 4) {
1783                 w += sldns_str_print(s, sl, "malformed subnet ");
1784                 w += print_hex_buf(s, sl, data, len);
1785                 return w;
1786         }
1787         family = sldns_read_uint16(data);
1788         source = data[2];
1789         scope = data[3];
1790         if(family == 1) {
1791                 /* IP4 */
1792                 char buf[64];
1793                 uint8_t ip4[4];
1794                 memset(ip4, 0, sizeof(ip4));
1795                 if(len-4 > 4) {
1796                         w += sldns_str_print(s, sl, "trailingdata:");
1797                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1798                         w += sldns_str_print(s, sl, " ");
1799                         len = 4+4;
1800                 }
1801                 memmove(ip4, data+4, len-4);
1802                 if(!inet_ntop(AF_INET, ip4, buf, (socklen_t)sizeof(buf))) {
1803                         w += sldns_str_print(s, sl, "ip4ntoperror ");
1804                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1805                 } else {
1806                         w += sldns_str_print(s, sl, "%s", buf);
1807                 }
1808         } else if(family == 2) {
1809                 /* IP6 */
1810                 char buf[64];
1811                 uint8_t ip6[16];
1812                 memset(ip6, 0, sizeof(ip6));
1813                 if(len-4 > 16) {
1814                         w += sldns_str_print(s, sl, "trailingdata:");
1815                         w += print_hex_buf(s, sl, data+4+16, len-4-16);
1816                         w += sldns_str_print(s, sl, " ");
1817                         len = 4+16;
1818                 }
1819                 memmove(ip6, data+4, len-4);
1820 #ifdef AF_INET6
1821                 if(!inet_ntop(AF_INET6, ip6, buf, (socklen_t)sizeof(buf))) {
1822                         w += sldns_str_print(s, sl, "ip6ntoperror ");
1823                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1824                 } else {
1825                         w += sldns_str_print(s, sl, "%s", buf);
1826                 }
1827 #else
1828                 w += print_hex_buf(s, sl, data+4+4, len-4-4);
1829 #endif
1830         } else {
1831                 /* unknown */
1832                 w += sldns_str_print(s, sl, "family %d ",
1833                         (int)family);
1834                 w += print_hex_buf(s, sl, data, len);
1835         }
1836         w += sldns_str_print(s, sl, "/%d scope /%d", (int)source, (int)scope);
1837         return w;
1838 }
1839
1840 int sldns_wire2str_edns_option_print(char** s, size_t* sl,
1841         uint16_t option_code, uint8_t* optdata, size_t optlen)
1842 {
1843         int w = 0;
1844         w += sldns_wire2str_edns_option_code_print(s, sl, option_code);
1845         w += sldns_str_print(s, sl, ": ");
1846         switch(option_code) {
1847         case LDNS_EDNS_LLQ:
1848                 w += sldns_wire2str_edns_llq_print(s, sl, optdata, optlen);
1849                 break;
1850         case LDNS_EDNS_UL:
1851                 w += sldns_wire2str_edns_ul_print(s, sl, optdata, optlen);
1852                 break;
1853         case LDNS_EDNS_NSID:
1854                 w += sldns_wire2str_edns_nsid_print(s, sl, optdata, optlen);
1855                 break;
1856         case LDNS_EDNS_DAU:
1857                 w += sldns_wire2str_edns_dau_print(s, sl, optdata, optlen);
1858                 break;
1859         case LDNS_EDNS_DHU:
1860                 w += sldns_wire2str_edns_dhu_print(s, sl, optdata, optlen);
1861                 break;
1862         case LDNS_EDNS_N3U:
1863                 w += sldns_wire2str_edns_n3u_print(s, sl, optdata, optlen);
1864                 break;
1865         case LDNS_EDNS_CLIENT_SUBNET:
1866                 w += sldns_wire2str_edns_subnet_print(s, sl, optdata, optlen);
1867                 break;
1868         case LDNS_EDNS_PADDING:
1869                 w += print_hex_buf(s, sl, optdata, optlen);
1870                 break;
1871         default:
1872                 /* unknown option code */
1873                 w += print_hex_buf(s, sl, optdata, optlen);
1874                 break;
1875         }
1876         return w;
1877 }
1878
1879 /** print the edns options to string */
1880 static int
1881 print_edns_opts(char** s, size_t* sl, uint8_t* rdata, size_t rdatalen)
1882 {
1883         uint16_t option_code, option_len;
1884         int w = 0;
1885         while(rdatalen > 0) {
1886                 /* option name */
1887                 if(rdatalen < 4) {
1888                         w += sldns_str_print(s, sl, " ; malformed: ");
1889                         w += print_hex_buf(s, sl, rdata, rdatalen);
1890                         return w;
1891                 }
1892                 option_code = sldns_read_uint16(rdata);
1893                 option_len = sldns_read_uint16(rdata+2);
1894                 rdata += 4;
1895                 rdatalen -= 4;
1896
1897                 /* option value */
1898                 if(rdatalen < (size_t)option_len) {
1899                         w += sldns_str_print(s, sl, " ; malformed ");
1900                         w += sldns_wire2str_edns_option_code_print(s, sl,
1901                                 option_code);
1902                         w += sldns_str_print(s, sl, ": ");
1903                         w += print_hex_buf(s, sl, rdata, rdatalen);
1904                         return w;
1905                 }
1906                 w += sldns_str_print(s, sl, " ; ");
1907                 w += sldns_wire2str_edns_option_print(s, sl, option_code,
1908                         rdata, option_len);
1909                 rdata += option_len;
1910                 rdatalen -= option_len;
1911         }
1912         return w;
1913 }
1914
1915 int sldns_wire2str_edns_scan(uint8_t** data, size_t* data_len, char** str,
1916         size_t* str_len, uint8_t* pkt, size_t pktlen)
1917 {
1918         int w = 0;
1919         uint8_t ext_rcode, edns_version;
1920         uint16_t udpsize, edns_bits, rdatalen;
1921         w += sldns_str_print(str, str_len, "; EDNS:");
1922
1923         /* some input checks, domain name */
1924         if(*data_len < 1+10)
1925                 return w + print_remainder_hex("Error malformed 0x",
1926                         data, data_len, str, str_len);
1927         if(*data[0] != 0) {
1928                 return w + print_remainder_hex("Error nonrootdname 0x",
1929                         data, data_len, str, str_len);
1930         }
1931         (*data)++;
1932         (*data_len)--;
1933
1934         /* check type and read fixed contents */
1935         if(sldns_read_uint16((*data)) != LDNS_RR_TYPE_OPT) {
1936                 return w + print_remainder_hex("Error nottypeOPT 0x",
1937                         data, data_len, str, str_len);
1938         }
1939         udpsize = sldns_read_uint16((*data)+2);
1940         ext_rcode = (*data)[4];
1941         edns_version = (*data)[5];
1942         edns_bits = sldns_read_uint16((*data)+6);
1943         rdatalen = sldns_read_uint16((*data)+8);
1944         (*data)+=10;
1945         (*data_len)-=10;
1946
1947         w += sldns_str_print(str, str_len, " version: %u;",
1948                 (unsigned)edns_version);
1949         w += sldns_str_print(str, str_len, " flags:");
1950         if((edns_bits & LDNS_EDNS_MASK_DO_BIT))
1951                 w += sldns_str_print(str, str_len, " do");
1952         /* the extended rcode is the value set, shifted four bits,
1953          * and or'd with the original rcode */
1954         if(ext_rcode) {
1955                 int rc = ((int)ext_rcode)<<4;
1956                 if(pkt && pktlen >= LDNS_HEADER_SIZE)
1957                         rc |= LDNS_RCODE_WIRE(pkt);
1958                 w += sldns_str_print(str, str_len, " ; ext-rcode: %d", rc);
1959         }
1960         w += sldns_str_print(str, str_len, " ; udp: %u", (unsigned)udpsize);
1961
1962         if(rdatalen) {
1963                 if(*data_len < rdatalen) {
1964                         w += sldns_str_print(str, str_len,
1965                                 " ; Error EDNS rdata too short; ");
1966                         rdatalen = *data_len;
1967                 }
1968                 w += print_edns_opts(str, str_len, *data, rdatalen);
1969                 (*data) += rdatalen;
1970                 (*data_len) -= rdatalen;
1971         }
1972         w += sldns_str_print(str, str_len, "\n");
1973         return w;
1974 }