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_ED25519, "ED25519"},
  51         { LDNS_ED448, "ED448"},
  52         { LDNS_INDIRECT, "INDIRECT" },
  53         { LDNS_PRIVATEDNS, "PRIVATEDNS" },
  54         { LDNS_PRIVATEOID, "PRIVATEOID" },
  55         { 0, NULL }
  56 };
  57 sldns_lookup_table* sldns_algorithms = sldns_algorithms_data;
  58
  59 /* hash algorithms in DS record */
  60 static sldns_lookup_table sldns_hashes_data[] = {
  61         { LDNS_SHA1, "SHA1" },
  62         { LDNS_SHA256, "SHA256" },
  63         { LDNS_HASH_GOST, "HASH-GOST" },
  64         { LDNS_SHA384, "SHA384" },
  65         { 0, NULL }
  66 };
  67 sldns_lookup_table* sldns_hashes = sldns_hashes_data;
  68
  69 /* Taken from RFC 4398  */
  70 static sldns_lookup_table sldns_cert_algorithms_data[] = {
  71         { LDNS_CERT_PKIX, "PKIX" },
  72         { LDNS_CERT_SPKI, "SPKI" },
  73         { LDNS_CERT_PGP, "PGP" },
  74         { LDNS_CERT_IPKIX, "IPKIX" },
  75         { LDNS_CERT_ISPKI, "ISPKI" },
  76         { LDNS_CERT_IPGP, "IPGP" },
  77         { LDNS_CERT_ACPKIX, "ACPKIX" },
  78         { LDNS_CERT_IACPKIX, "IACPKIX" },
  79         { LDNS_CERT_URI, "URI" },
  80         { LDNS_CERT_OID, "OID" },
  81         { 0, NULL }
  82 };
  83 sldns_lookup_table* sldns_cert_algorithms = sldns_cert_algorithms_data;
  84
  85 /* if these are used elsewhere */
  86 static sldns_lookup_table sldns_rcodes_data[] = {
  87         { LDNS_RCODE_NOERROR, "NOERROR" },
  88         { LDNS_RCODE_FORMERR, "FORMERR" },
  89         { LDNS_RCODE_SERVFAIL, "SERVFAIL" },
  90         { LDNS_RCODE_NXDOMAIN, "NXDOMAIN" },
  91         { LDNS_RCODE_NOTIMPL, "NOTIMPL" },
  92         { LDNS_RCODE_REFUSED, "REFUSED" },
  93         { LDNS_RCODE_YXDOMAIN, "YXDOMAIN" },
  94         { LDNS_RCODE_YXRRSET, "YXRRSET" },
  95         { LDNS_RCODE_NXRRSET, "NXRRSET" },
  96         { LDNS_RCODE_NOTAUTH, "NOTAUTH" },
  97         { LDNS_RCODE_NOTZONE, "NOTZONE" },
  98         { 0, NULL }
  99 };
 100 sldns_lookup_table* sldns_rcodes = sldns_rcodes_data;
 101
 102 static sldns_lookup_table sldns_opcodes_data[] = {
 103         { LDNS_PACKET_QUERY, "QUERY" },
 104         { LDNS_PACKET_IQUERY, "IQUERY" },
 105         { LDNS_PACKET_STATUS, "STATUS" },
 106         { LDNS_PACKET_NOTIFY, "NOTIFY" },
 107         { LDNS_PACKET_UPDATE, "UPDATE" },
 108         { 0, NULL }
 109 };
 110 sldns_lookup_table* sldns_opcodes = sldns_opcodes_data;
 111
 112 static sldns_lookup_table sldns_wireparse_errors_data[] = {
 113         { LDNS_WIREPARSE_ERR_OK, "no parse error" },
 114         { LDNS_WIREPARSE_ERR_GENERAL, "parse error" },
 115         { LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, "Domainname length overflow" },
 116         { LDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, "Domainname length underflow (zero length)" },
 117         { LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, "buffer too small" },
 118         { LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, "Label length overflow" },
 119         { LDNS_WIREPARSE_ERR_EMPTY_LABEL, "Empty label" },
 120         { LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE, "Syntax error, bad escape sequence" },
 121         { LDNS_WIREPARSE_ERR_SYNTAX, "Syntax error, could not parse the RR" },
 122         { LDNS_WIREPARSE_ERR_SYNTAX_TTL, "Syntax error, could not parse the RR's TTL" },
 123         { LDNS_WIREPARSE_ERR_SYNTAX_TYPE, "Syntax error, could not parse the RR's type" },
 124         { LDNS_WIREPARSE_ERR_SYNTAX_CLASS, "Syntax error, could not parse the RR's class" },
 125         { LDNS_WIREPARSE_ERR_SYNTAX_RDATA, "Syntax error, could not parse the RR's rdata" },
 126         { LDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE, "Syntax error, value expected" },
 127         { LDNS_WIREPARSE_ERR_INVALID_STR, "Conversion error, string expected" },
 128         { LDNS_WIREPARSE_ERR_SYNTAX_B64, "Conversion error, b64 encoding expected" },
 129         { LDNS_WIREPARSE_ERR_SYNTAX_B32_EXT, "Conversion error, b32 ext encoding expected" },
 130         { LDNS_WIREPARSE_ERR_SYNTAX_HEX, "Conversion error, hex encoding expected" },
 131         { LDNS_WIREPARSE_ERR_CERT_BAD_ALGORITHM, "Bad algorithm type for CERT record" },
 132         { LDNS_WIREPARSE_ERR_SYNTAX_TIME, "Conversion error, time encoding expected" },
 133         { LDNS_WIREPARSE_ERR_SYNTAX_PERIOD, "Conversion error, time period encoding expected" },
 134         { LDNS_WIREPARSE_ERR_SYNTAX_ILNP64, "Conversion error, 4 colon separated hex numbers expected" },
 135         { LDNS_WIREPARSE_ERR_SYNTAX_EUI48,
 136                 "Conversion error, 6 two character hex numbers "
 137                 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx" },
 138         { LDNS_WIREPARSE_ERR_SYNTAX_EUI64,
 139                 "Conversion error, 8 two character hex numbers "
 140                 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx-xx-xx" },
 141         { LDNS_WIREPARSE_ERR_SYNTAX_TAG,
 142                 "Conversion error, a non-zero sequence of US-ASCII letters "
 143                 "and numbers in lower case expected" },
 144         { LDNS_WIREPARSE_ERR_NOT_IMPL, "not implemented" },
 145         { LDNS_WIREPARSE_ERR_SYNTAX_INT, "Conversion error, integer expected" },
 146         { LDNS_WIREPARSE_ERR_SYNTAX_IP4, "Conversion error, ip4 addr expected" },
 147         { LDNS_WIREPARSE_ERR_SYNTAX_IP6, "Conversion error, ip6 addr expected" },
 148         { LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW, "Syntax error, integer overflow" },
 149         { LDNS_WIREPARSE_ERR_INCLUDE, "$INCLUDE directive was seen in the zone" },
 150         { LDNS_WIREPARSE_ERR_PARENTHESIS, "Parse error, parenthesis mismatch" },
 151         { 0, NULL }
 152 };
 153 sldns_lookup_table* sldns_wireparse_errors = sldns_wireparse_errors_data;
 154
 155 static sldns_lookup_table sldns_edns_flags_data[] = {
 156         { 3600, "do"},
 157         { 0, NULL}
 158 };
 159 sldns_lookup_table* sldns_edns_flags = sldns_edns_flags_data;
 160
 161 static sldns_lookup_table sldns_edns_options_data[] = {
 162         { 1, "LLQ" },
 163         { 2, "UL" },
 164         { 3, "NSID" },
 165         /* 4 draft-cheshire-edns0-owner-option */
 166         { 5, "DAU" },
 167         { 6, "DHU" },
 168         { 7, "N3U" },
 169         { 8, "edns-client-subnet" },
 170         { 11, "edns-tcp-keepalive"},
 171         { 12, "Padding" },
 172         { 0, NULL}
 173 };
 174 sldns_lookup_table* sldns_edns_options = sldns_edns_options_data;
 175
 176 static sldns_lookup_table sldns_tsig_errors_data[] = {
 177         { LDNS_TSIG_ERROR_NOERROR, "NOERROR" },
 178         { LDNS_RCODE_FORMERR, "FORMERR" },
 179         { LDNS_RCODE_SERVFAIL, "SERVFAIL" },
 180         { LDNS_RCODE_NXDOMAIN, "NXDOMAIN" },
 181         { LDNS_RCODE_NOTIMPL, "NOTIMPL" },
 182         { LDNS_RCODE_REFUSED, "REFUSED" },
 183         { LDNS_RCODE_YXDOMAIN, "YXDOMAIN" },
 184         { LDNS_RCODE_YXRRSET, "YXRRSET" },
 185         { LDNS_RCODE_NXRRSET, "NXRRSET" },
 186         { LDNS_RCODE_NOTAUTH, "NOTAUTH" },
 187         { LDNS_RCODE_NOTZONE, "NOTZONE" },
 188         { LDNS_TSIG_ERROR_BADSIG, "BADSIG" },
 189         { LDNS_TSIG_ERROR_BADKEY, "BADKEY" },
 190         { LDNS_TSIG_ERROR_BADTIME, "BADTIME" },
 191         { LDNS_TSIG_ERROR_BADMODE, "BADMODE" },
 192         { LDNS_TSIG_ERROR_BADNAME, "BADNAME" },
 193         { LDNS_TSIG_ERROR_BADALG, "BADALG" },
 194         { 0, NULL }
 195 };
 196 sldns_lookup_table* sldns_tsig_errors = sldns_tsig_errors_data;
 197
 198 char* sldns_wire2str_pkt(uint8_t* data, size_t len)
 199 {
 200         size_t slen = (size_t)sldns_wire2str_pkt_buf(data, len, NULL, 0);
 201         char* result = (char*)malloc(slen+1);
 202         if(!result) return NULL;
 203         sldns_wire2str_pkt_buf(data, len, result, slen+1);
 204         return result;
 205 }
 206
 207 char* sldns_wire2str_rr(uint8_t* rr, size_t len)
 208 {
 209         size_t slen = (size_t)sldns_wire2str_rr_buf(rr, len, NULL, 0);
 210         char* result = (char*)malloc(slen+1);
 211         if(!result) return NULL;
 212         sldns_wire2str_rr_buf(rr, len, result, slen+1);
 213         return result;
 214 }
 215
 216 char* sldns_wire2str_type(uint16_t rrtype)
 217 {
 218         char buf[16];
 219         sldns_wire2str_type_buf(rrtype, buf, sizeof(buf));
 220         return strdup(buf);
 221 }
 222
 223 char* sldns_wire2str_class(uint16_t rrclass)
 224 {
 225         char buf[16];
 226         sldns_wire2str_class_buf(rrclass, buf, sizeof(buf));
 227         return strdup(buf);
 228 }
 229
 230 char* sldns_wire2str_dname(uint8_t* dname, size_t dname_len)
 231 {
 232         size_t slen=(size_t)sldns_wire2str_dname_buf(dname, dname_len, NULL, 0);
 233         char* result = (char*)malloc(slen+1);
 234         if(!result) return NULL;
 235         sldns_wire2str_dname_buf(dname, dname_len, result, slen+1);
 236         return result;
 237 }
 238
 239 char* sldns_wire2str_rcode(int rcode)
 240 {
 241         char buf[16];
 242         sldns_wire2str_rcode_buf(rcode, buf, sizeof(buf));
 243         return strdup(buf);
 244 }
 245
 246 int sldns_wire2str_pkt_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 247 {
 248         /* use arguments as temporary variables */
 249         return sldns_wire2str_pkt_scan(&d, &dlen, &s, &slen);
 250 }
 251
 252 int sldns_wire2str_rr_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 253 {
 254         /* use arguments as temporary variables */
 255         return sldns_wire2str_rr_scan(&d, &dlen, &s, &slen, NULL, 0);
 256 }
 257
 258 int sldns_wire2str_rdata_buf(uint8_t* rdata, size_t rdata_len, char* str,
 259         size_t str_len, uint16_t rrtype)
 260 {
 261         /* use arguments as temporary variables */
 262         return sldns_wire2str_rdata_scan(&rdata, &rdata_len, &str, &str_len,
 263                 rrtype, NULL, 0);
 264 }
 265
 266 int sldns_wire2str_rr_unknown_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 267 {
 268         /* use arguments as temporary variables */
 269         return sldns_wire2str_rr_unknown_scan(&d, &dlen, &s, &slen, NULL, 0);
 270 }
 271
 272 int sldns_wire2str_rr_comment_buf(uint8_t* rr, size_t rrlen, size_t dname_len,
 273         char* s, size_t slen)
 274 {
 275         uint16_t rrtype = sldns_wirerr_get_type(rr, rrlen, dname_len);
 276         return sldns_wire2str_rr_comment_print(&s, &slen, rr, rrlen, dname_len,
 277                 rrtype);
 278 }
 279
 280 int sldns_wire2str_type_buf(uint16_t rrtype, char* s, size_t slen)
 281 {
 282         /* use arguments as temporary variables */
 283         return sldns_wire2str_type_print(&s, &slen, rrtype);
 284 }
 285
 286 int sldns_wire2str_class_buf(uint16_t rrclass, char* s, size_t slen)
 287 {
 288         /* use arguments as temporary variables */
 289         return sldns_wire2str_class_print(&s, &slen, rrclass);
 290 }
 291
 292 int sldns_wire2str_rcode_buf(int rcode, char* s, size_t slen)
 293 {
 294         /* use arguments as temporary variables */
 295         return sldns_wire2str_rcode_print(&s, &slen, rcode);
 296 }
 297
 298 int sldns_wire2str_opcode_buf(int opcode, char* s, size_t slen)
 299 {
 300         /* use arguments as temporary variables */
 301         return sldns_wire2str_opcode_print(&s, &slen, opcode);
 302 }
 303
 304 int sldns_wire2str_dname_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
 305 {
 306         /* use arguments as temporary variables */
 307         return sldns_wire2str_dname_scan(&d, &dlen, &s, &slen, NULL, 0);
 308 }
 309
 310 int sldns_str_vprint(char** str, size_t* slen, const char* format, va_list args)
 311 {
 312         int w = vsnprintf(*str, *slen, format, args);
 313         if(w < 0) {
 314                 /* error in printout */
 315                 return 0;
 316         } else if((size_t)w >= *slen) {
 317                 *str = NULL; /* we do not want str to point outside of buffer*/
 318                 *slen = 0;
 319         } else {
 320                 *str += w;
 321                 *slen -= w;
 322         }
 323         return w;
 324 }
 325
 326 int sldns_str_print(char** str, size_t* slen, const char* format, ...)
 327 {
 328         int w;
 329         va_list args;
 330         va_start(args, format);
 331         w = sldns_str_vprint(str, slen, format, args);
 332         va_end(args);
 333         return w;
 334 }
 335
 336 /** print hex format into text buffer for specified length */
 337 static int print_hex_buf(char** s, size_t* slen, uint8_t* buf, size_t len)
 338 {
 339         const char* hex = "0123456789ABCDEF";
 340         size_t i;
 341         for(i=0; i<len; i++) {
 342                 (void)sldns_str_print(s, slen, "%c%c", hex[(buf[i]&0xf0)>>4],
 343                         hex[buf[i]&0x0f]);
 344         }
 345         return (int)len*2;
 346 }
 347
 348 /** print remainder of buffer in hex format with prefixed text */
 349 static int print_remainder_hex(const char* pref, uint8_t** d, size_t* dlen,
 350         char** s, size_t* slen)
 351 {
 352         int w = 0;
 353         w += sldns_str_print(s, slen, "%s", pref);
 354         w += print_hex_buf(s, slen, *d, *dlen);
 355         *d += *dlen;
 356         *dlen = 0;
 357         return w;
 358 }
 359
 360 int sldns_wire2str_pkt_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 361 {
 362         int w = 0;
 363         unsigned qdcount, ancount, nscount, arcount, i;
 364         uint8_t* pkt = *d;
 365         size_t pktlen = *dlen;
 366         if(*dlen >= LDNS_HEADER_SIZE) {
 367                 qdcount = (unsigned)LDNS_QDCOUNT(*d);
 368                 ancount = (unsigned)LDNS_ANCOUNT(*d);
 369                 nscount = (unsigned)LDNS_NSCOUNT(*d);
 370                 arcount = (unsigned)LDNS_ARCOUNT(*d);
 371         } else {
 372                 qdcount = ancount = nscount = arcount = 0;
 373         }
 374         w += sldns_wire2str_header_scan(d, dlen, s, slen);
 375         w += sldns_str_print(s, slen, "\n");
 376         w += sldns_str_print(s, slen, ";; QUESTION SECTION:\n");
 377         for(i=0; i<qdcount; i++) {
 378                 w += sldns_wire2str_rrquestion_scan(d, dlen, s, slen,
 379                         pkt, pktlen);
 380                 if(!*dlen) break;
 381         }
 382         w += sldns_str_print(s, slen, "\n");
 383         w += sldns_str_print(s, slen, ";; ANSWER SECTION:\n");
 384         for(i=0; i<ancount; i++) {
 385                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 386                 if(!*dlen) break;
 387         }
 388         w += sldns_str_print(s, slen, "\n");
 389         w += sldns_str_print(s, slen, ";; AUTHORITY SECTION:\n");
 390         for(i=0; i<nscount; i++) {
 391                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 392                 if(!*dlen) break;
 393         }
 394         w += sldns_str_print(s, slen, "\n");
 395         w += sldns_str_print(s, slen, ";; ADDITIONAL SECTION:\n");
 396         for(i=0; i<arcount; i++) {
 397                 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen);
 398                 if(!*dlen) break;
 399         }
 400         /* other fields: WHEN(time), SERVER(IP) not available here. */
 401         w += sldns_str_print(s, slen, ";; MSG SIZE  rcvd: %d\n", (int)pktlen);
 402         if(*dlen > 0) {
 403                 w += print_remainder_hex(";; trailing garbage 0x",
 404                         d, dlen, s, slen);
 405                 w += sldns_str_print(s, slen, "\n");
 406         }
 407         return w;
 408 }
 409
 410 /** scan type, class and ttl and printout, for rr */
 411 static int sldns_rr_tcttl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
 412 {
 413         int w = 0;
 414         uint16_t t, c;
 415         uint32_t ttl;
 416         if(*dl < 8) {
 417                 if(*dl < 4)
 418                         return w + print_remainder_hex("; Error malformed 0x",
 419                                 d, dl, s, sl);
 420                 /* these print values or 0x.. if none left */
 421                 t = sldns_read_uint16(*d);
 422                 c = sldns_read_uint16((*d)+2);
 423                 (*d)+=4;
 424                 (*dl)-=4;
 425                 w += sldns_wire2str_class_print(s, sl, c);
 426                 w += sldns_str_print(s, sl, "\t");
 427                 w += sldns_wire2str_type_print(s, sl, t);
 428                 if(*dl == 0)
 429                         return w + sldns_str_print(s, sl, "; Error no ttl");
 430                 return w + print_remainder_hex(
 431                         "; Error malformed ttl 0x", d, dl, s, sl);
 432         }
 433         t = sldns_read_uint16(*d);
 434         c = sldns_read_uint16((*d)+2);
 435         ttl = sldns_read_uint32((*d)+4);
 436         (*d)+=8;
 437         (*dl)-=8;
 438         w += sldns_str_print(s, sl, "%lu\t", (unsigned long)ttl);
 439         w += sldns_wire2str_class_print(s, sl, c);
 440         w += sldns_str_print(s, sl, "\t");
 441         w += sldns_wire2str_type_print(s, sl, t);
 442         return w;
 443 }
 444
 445 int sldns_wire2str_rr_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 446         uint8_t* pkt, size_t pktlen)
 447 {
 448         int w = 0;
 449         uint8_t* rr = *d;
 450         size_t rrlen = *dlen, dname_off, rdlen, ordlen;
 451         uint16_t rrtype = 0;
 452
 453         if(*dlen >= 3 && (*d)[0]==0 &&
 454                 sldns_read_uint16((*d)+1)==LDNS_RR_TYPE_OPT) {
 455                 /* perform EDNS OPT processing */
 456                 return sldns_wire2str_edns_scan(d, dlen, s, slen, pkt, pktlen);
 457         }
 458
 459         /* try to scan the rdata with pretty-printing, but if that fails, then
 460          * scan the rdata as an unknown RR type */
 461         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 462         w += sldns_str_print(s, slen, "\t");
 463         dname_off = rrlen-(*dlen);
 464         if(*dlen == 4) {
 465                 /* like a question-RR */
 466                 uint16_t t = sldns_read_uint16(*d);
 467                 uint16_t c = sldns_read_uint16((*d)+2);
 468                 (*d)+=4;
 469                 (*dlen)-=4;
 470                 w += sldns_wire2str_class_print(s, slen, c);
 471                 w += sldns_str_print(s, slen, "\t");
 472                 w += sldns_wire2str_type_print(s, slen, t);
 473                 w += sldns_str_print(s, slen, " ; Error no ttl,rdata\n");
 474                 return w;
 475         }
 476         if(*dlen < 8) {
 477                 if(*dlen == 0)
 478                         return w + sldns_str_print(s, slen, ";Error missing RR\n");
 479                 w += print_remainder_hex(";Error partial RR 0x", d, dlen, s, slen);
 480                 return w + sldns_str_print(s, slen, "\n");
 481         }
 482         rrtype = sldns_read_uint16(*d);
 483         w += sldns_rr_tcttl_scan(d, dlen, s, slen);
 484         w += sldns_str_print(s, slen, "\t");
 485
 486         /* rdata */
 487         if(*dlen < 2) {
 488                 if(*dlen == 0)
 489                         return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
 490                 w += print_remainder_hex(";Error missing rdatalen 0x",
 491                         d, dlen, s, slen);
 492                 return w + sldns_str_print(s, slen, "\n");
 493         }
 494         rdlen = sldns_read_uint16(*d);
 495         ordlen = rdlen;
 496         (*d)+=2;
 497         (*dlen)-=2;
 498         if(*dlen < rdlen) {
 499                 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
 500                 if(*dlen == 0)
 501                         return w + sldns_str_print(s, slen, ";Error missing rdata\n");
 502                 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
 503                 return w + sldns_str_print(s, slen, "\n");
 504         }
 505         w += sldns_wire2str_rdata_scan(d, &rdlen, s, slen, rrtype, pkt, pktlen);
 506         (*dlen) -= (ordlen-rdlen);
 507
 508         /* default comment */
 509         w += sldns_wire2str_rr_comment_print(s, slen, rr, rrlen, dname_off,
 510                 rrtype);
 511         w += sldns_str_print(s, slen, "\n");
 512         return w;
 513 }
 514
 515 int sldns_wire2str_rrquestion_scan(uint8_t** d, size_t* dlen, char** s,
 516         size_t* slen, uint8_t* pkt, size_t pktlen)
 517 {
 518         int w = 0;
 519         uint16_t t, c;
 520         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 521         w += sldns_str_print(s, slen, "\t");
 522         if(*dlen < 4) {
 523                 if(*dlen == 0)
 524                         return w + sldns_str_print(s, slen, "Error malformed\n");
 525                 w += print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 526                 return w + sldns_str_print(s, slen, "\n");
 527         }
 528         t = sldns_read_uint16(*d);
 529         c = sldns_read_uint16((*d)+2);
 530         (*d)+=4;
 531         (*dlen)-=4;
 532         w += sldns_wire2str_class_print(s, slen, c);
 533         w += sldns_str_print(s, slen, "\t");
 534         w += sldns_wire2str_type_print(s, slen, t);
 535         w += sldns_str_print(s, slen, "\n");
 536         return w;
 537 }
 538
 539 int sldns_wire2str_rr_unknown_scan(uint8_t** d, size_t* dlen, char** s,
 540         size_t* slen, uint8_t* pkt, size_t pktlen)
 541 {
 542         size_t rdlen, ordlen;
 543         int w = 0;
 544         w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 545         w += sldns_str_print(s, slen, "\t");
 546         w += sldns_rr_tcttl_scan(d, dlen, s, slen);
 547         w += sldns_str_print(s, slen, "\t");
 548         if(*dlen < 2) {
 549                 if(*dlen == 0)
 550                         return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
 551                 w += print_remainder_hex(";Error missing rdatalen 0x",
 552                         d, dlen, s, slen);
 553                 return w + sldns_str_print(s, slen, "\n");
 554         }
 555         rdlen = sldns_read_uint16(*d);
 556         ordlen = rdlen;
 557         (*d) += 2;
 558         (*dlen) -= 2;
 559         if(*dlen < rdlen) {
 560                 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
 561                 if(*dlen == 0)
 562                         return w + sldns_str_print(s, slen, ";Error missing rdata\n");
 563                 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
 564                 return w + sldns_str_print(s, slen, "\n");
 565         }
 566         w += sldns_wire2str_rdata_unknown_scan(d, &rdlen, s, slen);
 567         (*dlen) -= (ordlen-rdlen);
 568         w += sldns_str_print(s, slen, "\n");
 569         return w;
 570 }
 571
 572 /** print rr comment for type DNSKEY */
 573 static int rr_comment_dnskey(char** s, size_t* slen, uint8_t* rr,
 574         size_t rrlen, size_t dname_off)
 575 {
 576         size_t rdlen;
 577         uint8_t* rdata;
 578         int flags, w = 0;
 579         if(rrlen < dname_off + 10) return 0;
 580         rdlen = sldns_read_uint16(rr+dname_off+8);
 581         if(rrlen < dname_off + 10 + rdlen) return 0;
 582         rdata = rr + dname_off + 10;
 583         flags = (int)sldns_read_uint16(rdata);
 584         w += sldns_str_print(s, slen, " ;{");
 585
 586         /* id */
 587         w += sldns_str_print(s, slen, "id = %u",
 588                 sldns_calc_keytag_raw(rdata, rdlen));
 589
 590         /* flags */
 591         if((flags&LDNS_KEY_ZONE_KEY)) {
 592                 if((flags&LDNS_KEY_SEP_KEY))
 593                         w += sldns_str_print(s, slen, " (ksk)");
 594                 else    w += sldns_str_print(s, slen, " (zsk)");
 595         }
 596
 597         /* keysize */
 598         if(rdlen > 4) {
 599                 w += sldns_str_print(s, slen, ", ");
 600                 w += sldns_str_print(s, slen, "size = %db",
 601                         (int)sldns_rr_dnskey_key_size_raw(
 602                         (unsigned char*)rdata+4, rdlen-4, (int)(rdata[3])));
 603         }
 604
 605         w += sldns_str_print(s, slen, "}");
 606         return w;
 607 }
 608
 609 /** print rr comment for type RRSIG */
 610 static int rr_comment_rrsig(char** s, size_t* slen, uint8_t* rr,
 611         size_t rrlen, size_t dname_off)
 612 {
 613         size_t rdlen;
 614         uint8_t* rdata;
 615         if(rrlen < dname_off + 10) return 0;
 616         rdlen = sldns_read_uint16(rr+dname_off+8);
 617         if(rrlen < dname_off + 10 + rdlen) return 0;
 618         rdata = rr + dname_off + 10;
 619         if(rdlen < 18) return 0;
 620         return sldns_str_print(s, slen, " ;{id = %d}",
 621                 (int)sldns_read_uint16(rdata+16));
 622 }
 623
 624 /** print rr comment for type NSEC3 */
 625 static int rr_comment_nsec3(char** s, size_t* slen, uint8_t* rr,
 626         size_t rrlen, size_t dname_off)
 627 {
 628         size_t rdlen;
 629         uint8_t* rdata;
 630         int w = 0;
 631         if(rrlen < dname_off + 10) return 0;
 632         rdlen = sldns_read_uint16(rr+dname_off+8);
 633         if(rrlen < dname_off + 10 + rdlen) return 0;
 634         rdata = rr + dname_off + 10;
 635         if(rdlen < 2) return 0;
 636         if((rdata[1] & LDNS_NSEC3_VARS_OPTOUT_MASK))
 637                 w += sldns_str_print(s, slen, " ;{flags: optout}");
 638         return w;
 639 }
 640
 641 int sldns_wire2str_rr_comment_print(char** s, size_t* slen, uint8_t* rr,
 642         size_t rrlen, size_t dname_off, uint16_t rrtype)
 643 {
 644         if(rrtype == LDNS_RR_TYPE_DNSKEY) {
 645                 return rr_comment_dnskey(s, slen, rr, rrlen, dname_off);
 646         } else if(rrtype == LDNS_RR_TYPE_RRSIG) {
 647                 return rr_comment_rrsig(s, slen, rr, rrlen, dname_off);
 648         } else if(rrtype == LDNS_RR_TYPE_NSEC3) {
 649                 return rr_comment_nsec3(s, slen, rr, rrlen, dname_off);
 650         }
 651         return 0;
 652 }
 653
 654 int sldns_wire2str_header_scan(uint8_t** d, size_t* dlen, char** s,
 655         size_t* slen)
 656 {
 657         int w = 0;
 658         int opcode, rcode;
 659         w += sldns_str_print(s, slen, ";; ->>HEADER<<- ");
 660         if(*dlen == 0)
 661                 return w+sldns_str_print(s, slen, "Error empty packet");
 662         if(*dlen < 4)
 663                 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
 664         opcode = (int)LDNS_OPCODE_WIRE(*d);
 665         rcode = (int)LDNS_RCODE_WIRE(*d);
 666         w += sldns_str_print(s, slen, "opcode: ");
 667         w += sldns_wire2str_opcode_print(s, slen, opcode);
 668         w += sldns_str_print(s, slen, ", ");
 669         w += sldns_str_print(s, slen, "rcode: ");
 670         w += sldns_wire2str_rcode_print(s, slen, rcode);
 671         w += sldns_str_print(s, slen, ", ");
 672         w += sldns_str_print(s, slen, "id: %d\n", (int)LDNS_ID_WIRE(*d));
 673         w += sldns_str_print(s, slen, ";; flags:");
 674         if(LDNS_QR_WIRE(*d)) w += sldns_str_print(s, slen, " qr");
 675         if(LDNS_AA_WIRE(*d)) w += sldns_str_print(s, slen, " aa");
 676         if(LDNS_TC_WIRE(*d)) w += sldns_str_print(s, slen, " tc");
 677         if(LDNS_RD_WIRE(*d)) w += sldns_str_print(s, slen, " rd");
 678         if(LDNS_CD_WIRE(*d)) w += sldns_str_print(s, slen, " cd");
 679         if(LDNS_RA_WIRE(*d)) w += sldns_str_print(s, slen, " ra");
 680         if(LDNS_AD_WIRE(*d)) w += sldns_str_print(s, slen, " ad");
 681         if(LDNS_Z_WIRE(*d))  w += sldns_str_print(s, slen, " z");
 682         w += sldns_str_print(s, slen, " ; ");
 683         if(*dlen < LDNS_HEADER_SIZE)
 684                 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
 685         w += sldns_str_print(s, slen, "QUERY: %d, ", (int)LDNS_QDCOUNT(*d));
 686         w += sldns_str_print(s, slen, "ANSWER: %d, ", (int)LDNS_ANCOUNT(*d));
 687         w += sldns_str_print(s, slen, "AUTHORITY: %d, ", (int)LDNS_NSCOUNT(*d));
 688         w += sldns_str_print(s, slen, "ADDITIONAL: %d ", (int)LDNS_ARCOUNT(*d));
 689         *d += LDNS_HEADER_SIZE;
 690         *dlen -= LDNS_HEADER_SIZE;
 691         return w;
 692 }
 693
 694 int sldns_wire2str_rdata_scan(uint8_t** d, size_t* dlen, char** s,
 695         size_t* slen, uint16_t rrtype, uint8_t* pkt, size_t pktlen)
 696 {
 697         /* try to prettyprint, but if that fails, use unknown format */
 698         uint8_t* origd = *d;
 699         char* origs = *s;
 700         size_t origdlen = *dlen, origslen = *slen;
 701         size_t r_cnt, r_max;
 702         sldns_rdf_type rdftype;
 703         int w = 0, n;
 704
 705         const sldns_rr_descriptor *desc = sldns_rr_descript(rrtype);
 706         if(!desc) /* unknown format */
 707                 return sldns_wire2str_rdata_unknown_scan(d, dlen, s, slen);
 708         /* dlen equals the rdatalen for the rdata */
 709
 710         r_max = sldns_rr_descriptor_maximum(desc);
 711         for(r_cnt=0; r_cnt < r_max; r_cnt++) {
 712                 if(*dlen == 0) {
 713                         if(r_cnt < sldns_rr_descriptor_minimum(desc))
 714                                 goto failed;
 715                         break; /* nothing more to print */
 716                 }
 717                 rdftype = sldns_rr_descriptor_field_type(desc, r_cnt);
 718                 if(r_cnt != 0)
 719                         w += sldns_str_print(s, slen, " ");
 720                 n = sldns_wire2str_rdf_scan(d, dlen, s, slen, rdftype,
 721                         pkt, pktlen);
 722                 if(n == -1) {
 723                 failed:
 724                         /* failed, use unknown format */
 725                         *d = origd; *s = origs;
 726                         *dlen = origdlen; *slen = origslen;
 727                         return sldns_wire2str_rdata_unknown_scan(d, dlen,
 728                                 s, slen);
 729                 }
 730                 w += n;
 731         }
 732         if(*dlen != 0) {
 733                 goto failed;
 734         }
 735         return w;
 736 }
 737
 738 int sldns_wire2str_rdata_unknown_scan(uint8_t** d, size_t* dlen, char** s,
 739         size_t* slen)
 740 {
 741         int w = 0;
 742
 743         /* print length */
 744         w += sldns_str_print(s, slen, "\\# %u", (unsigned)*dlen);
 745
 746         /* print rdlen in hex */
 747         if(*dlen != 0)
 748                 w += sldns_str_print(s, slen, " ");
 749         w += print_hex_buf(s, slen, *d, *dlen);
 750         (*d) += *dlen;
 751         (*dlen) = 0;
 752         return w;
 753 }
 754
 755 /** print and escape one character for a domain dname */
 756 static int dname_char_print(char** s, size_t* slen, uint8_t c)
 757 {
 758         if(c == '.' || c == ';' || c == '(' || c == ')' || c == '\\')
 759                 return sldns_str_print(s, slen, "\\%c", c);
 760         else if(!(isascii((unsigned char)c) && isgraph((unsigned char)c)))
 761                 return sldns_str_print(s, slen, "\\%03u", (unsigned)c);
 762         /* plain printout */
 763         if(*slen) {
 764                 **s = (char)c;
 765                 (*s)++;
 766                 (*slen)--;
 767         }
 768         return 1;
 769 }
 770
 771 int sldns_wire2str_dname_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 772         uint8_t* pkt, size_t pktlen)
 773 {
 774         int w = 0;
 775         /* spool labels onto the string, use compression if its there */
 776         uint8_t* pos = *d;
 777         unsigned i, counter=0;
 778         const unsigned maxcompr = 1000; /* loop detection, max compr ptrs */
 779         int in_buf = 1;
 780         if(*dlen == 0) return sldns_str_print(s, slen, "ErrorMissingDname");
 781         if(*pos == 0) {
 782                 (*d)++;
 783                 (*dlen)--;
 784                 return sldns_str_print(s, slen, ".");
 785         }
 786         while(*pos) {
 787                 /* read label length */
 788                 uint8_t labellen = *pos++;
 789                 if(in_buf) { (*d)++; (*dlen)--; }
 790
 791                 /* find out what sort of label we have */
 792                 if((labellen&0xc0) == 0xc0) {
 793                         /* compressed */
 794                         uint16_t target = 0;
 795                         if(in_buf && *dlen == 0)
 796                                 return w + sldns_str_print(s, slen,
 797                                         "ErrorPartialDname");
 798                         else if(!in_buf && pos+1 > pkt+pktlen)
 799                                 return w + sldns_str_print(s, slen,
 800                                         "ErrorPartialDname");
 801                         target = ((labellen&0x3f)<<8) | *pos;
 802                         if(in_buf) { (*d)++; (*dlen)--; }
 803                         /* move to target, if possible */
 804                         if(!pkt || target >= pktlen)
 805                                 return w + sldns_str_print(s, slen,
 806                                         "ErrorComprPtrOutOfBounds");
 807                         if(counter++ > maxcompr)
 808                                 return w + sldns_str_print(s, slen,
 809                                         "ErrorComprPtrLooped");
 810                         in_buf = 0;
 811                         pos = pkt+target;
 812                         continue;
 813                 } else if((labellen&0xc0)) {
 814                         /* notimpl label type */
 815                         w += sldns_str_print(s, slen,
 816                                 "ErrorLABELTYPE%xIsUnknown",
 817                                 (int)(labellen&0xc0));
 818                         return w;
 819                 }
 820
 821                 /* spool label characters, end with '.' */
 822                 if(in_buf && *dlen < (size_t)labellen)
 823                         labellen = (uint8_t)*dlen;
 824                 else if(!in_buf && pos+(size_t)labellen > pkt+pktlen)
 825                         labellen = (uint8_t)(pkt + pktlen - pos);
 826                 for(i=0; i<(unsigned)labellen; i++) {
 827                         w += dname_char_print(s, slen, *pos++);
 828                 }
 829                 if(in_buf) {
 830                         (*d) += labellen;
 831                         (*dlen) -= labellen;
 832                         if(*dlen == 0) break;
 833                 }
 834                 w += sldns_str_print(s, slen, ".");
 835         }
 836         /* skip over final root label */
 837         if(in_buf && *dlen > 0) { (*d)++; (*dlen)--; }
 838         /* in case we printed no labels, terminate dname */
 839         if(w == 0) w += sldns_str_print(s, slen, ".");
 840         return w;
 841 }
 842
 843 int sldns_wire2str_opcode_print(char** s, size_t* slen, int opcode)
 844 {
 845         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_opcodes, opcode);
 846         if (lt && lt->name) {
 847                 return sldns_str_print(s, slen, "%s", lt->name);
 848         }
 849         return sldns_str_print(s, slen, "OPCODE%u", (unsigned)opcode);
 850 }
 851
 852 int sldns_wire2str_rcode_print(char** s, size_t* slen, int rcode)
 853 {
 854         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rcodes, rcode);
 855         if (lt && lt->name) {
 856                 return sldns_str_print(s, slen, "%s", lt->name);
 857         }
 858         return sldns_str_print(s, slen, "RCODE%u", (unsigned)rcode);
 859 }
 860
 861 int sldns_wire2str_class_print(char** s, size_t* slen, uint16_t rrclass)
 862 {
 863         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rr_classes,
 864                 (int)rrclass);
 865         if (lt && lt->name) {
 866                 return sldns_str_print(s, slen, "%s", lt->name);
 867         }
 868         return sldns_str_print(s, slen, "CLASS%u", (unsigned)rrclass);
 869 }
 870
 871 int sldns_wire2str_type_print(char** s, size_t* slen, uint16_t rrtype)
 872 {
 873         const sldns_rr_descriptor *descriptor = sldns_rr_descript(rrtype);
 874         if (descriptor && descriptor->_name) {
 875                 return sldns_str_print(s, slen, "%s", descriptor->_name);
 876         }
 877         return sldns_str_print(s, slen, "TYPE%u", (unsigned)rrtype);
 878 }
 879
 880 int sldns_wire2str_edns_option_code_print(char** s, size_t* slen,
 881         uint16_t opcode)
 882 {
 883         sldns_lookup_table *lt = sldns_lookup_by_id(sldns_edns_options,
 884                 (int)opcode);
 885         if (lt && lt->name) {
 886                 return sldns_str_print(s, slen, "%s", lt->name);
 887         }
 888         return sldns_str_print(s, slen, "OPT%u", (unsigned)opcode);
 889 }
 890
 891 int sldns_wire2str_class_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 892 {
 893         uint16_t c;
 894         if(*dlen == 0) return 0;
 895         if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 896         c = sldns_read_uint16(*d);
 897         (*d)+=2;
 898         (*dlen)-=2;
 899         return sldns_wire2str_class_print(s, slen, c);
 900 }
 901
 902 int sldns_wire2str_type_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 903 {
 904         uint16_t t;
 905         if(*dlen == 0) return 0;
 906         if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 907         t = sldns_read_uint16(*d);
 908         (*d)+=2;
 909         (*dlen)-=2;
 910         return sldns_wire2str_type_print(s, slen, t);
 911 }
 912
 913 int sldns_wire2str_ttl_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
 914 {
 915         uint32_t ttl;
 916         if(*dlen == 0) return 0;
 917         if(*dlen < 4) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
 918         ttl = sldns_read_uint32(*d);
 919         (*d)+=4;
 920         (*dlen)-=4;
 921         return sldns_str_print(s, slen, "%u", (unsigned)ttl);
 922 }
 923
 924 int sldns_wire2str_rdf_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
 925         int rdftype, uint8_t* pkt, size_t pktlen)
 926 {
 927         if(*dlen == 0) return 0;
 928         switch(rdftype) {
 929         case LDNS_RDF_TYPE_NONE:
 930                 return 0;
 931         case LDNS_RDF_TYPE_DNAME:
 932                 return sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen);
 933         case LDNS_RDF_TYPE_INT8:
 934                 return sldns_wire2str_int8_scan(d, dlen, s, slen);
 935         case LDNS_RDF_TYPE_INT16:
 936                 return sldns_wire2str_int16_scan(d, dlen, s, slen);
 937         case LDNS_RDF_TYPE_INT32:
 938                 return sldns_wire2str_int32_scan(d, dlen, s, slen);
 939         case LDNS_RDF_TYPE_PERIOD:
 940                 return sldns_wire2str_period_scan(d, dlen, s, slen);
 941         case LDNS_RDF_TYPE_TSIGTIME:
 942                 return sldns_wire2str_tsigtime_scan(d, dlen, s, slen);
 943         case LDNS_RDF_TYPE_A:
 944                 return sldns_wire2str_a_scan(d, dlen, s, slen);
 945         case LDNS_RDF_TYPE_AAAA:
 946                 return sldns_wire2str_aaaa_scan(d, dlen, s, slen);
 947         case LDNS_RDF_TYPE_STR:
 948                 return sldns_wire2str_str_scan(d, dlen, s, slen);
 949         case LDNS_RDF_TYPE_APL:
 950                 return sldns_wire2str_apl_scan(d, dlen, s, slen);
 951         case LDNS_RDF_TYPE_B32_EXT:
 952                 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
 953         case LDNS_RDF_TYPE_B64:
 954                 return sldns_wire2str_b64_scan(d, dlen, s, slen);
 955         case LDNS_RDF_TYPE_HEX:
 956                 return sldns_wire2str_hex_scan(d, dlen, s, slen);
 957         case LDNS_RDF_TYPE_NSEC:
 958                 return sldns_wire2str_nsec_scan(d, dlen, s, slen);
 959         case LDNS_RDF_TYPE_NSEC3_SALT:
 960                 return sldns_wire2str_nsec3_salt_scan(d, dlen, s, slen);
 961         case LDNS_RDF_TYPE_TYPE:
 962                 return sldns_wire2str_type_scan(d, dlen, s, slen);
 963         case LDNS_RDF_TYPE_CLASS:
 964                 return sldns_wire2str_class_scan(d, dlen, s, slen);
 965         case LDNS_RDF_TYPE_CERT_ALG:
 966                 return sldns_wire2str_cert_alg_scan(d, dlen, s, slen);
 967         case LDNS_RDF_TYPE_ALG:
 968                 return sldns_wire2str_alg_scan(d, dlen, s, slen);
 969         case LDNS_RDF_TYPE_UNKNOWN:
 970                 return sldns_wire2str_unknown_scan(d, dlen, s, slen);
 971         case LDNS_RDF_TYPE_TIME:
 972                 return sldns_wire2str_time_scan(d, dlen, s, slen);
 973         case LDNS_RDF_TYPE_LOC:
 974                 return sldns_wire2str_loc_scan(d, dlen, s, slen);
 975         case LDNS_RDF_TYPE_WKS:
 976         case LDNS_RDF_TYPE_SERVICE:
 977                 return sldns_wire2str_wks_scan(d, dlen, s, slen);
 978         case LDNS_RDF_TYPE_NSAP:
 979                 return sldns_wire2str_nsap_scan(d, dlen, s, slen);
 980         case LDNS_RDF_TYPE_ATMA:
 981                 return sldns_wire2str_atma_scan(d, dlen, s, slen);
 982         case LDNS_RDF_TYPE_IPSECKEY:
 983                 return sldns_wire2str_ipseckey_scan(d, dlen, s, slen, pkt,
 984                         pktlen);
 985         case LDNS_RDF_TYPE_HIP:
 986                 return sldns_wire2str_hip_scan(d, dlen, s, slen);
 987         case LDNS_RDF_TYPE_INT16_DATA:
 988                 return sldns_wire2str_int16_data_scan(d, dlen, s, slen);
 989         case LDNS_RDF_TYPE_NSEC3_NEXT_OWNER:
 990                 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
 991         case LDNS_RDF_TYPE_ILNP64:
 992                 return sldns_wire2str_ilnp64_scan(d, dlen, s, slen);
 993         case LDNS_RDF_TYPE_EUI48:
 994                 return sldns_wire2str_eui48_scan(d, dlen, s, slen);
 995         case LDNS_RDF_TYPE_EUI64:
 996                 return sldns_wire2str_eui64_scan(d, dlen, s, slen);
 997         case LDNS_RDF_TYPE_TAG:
 998                 return sldns_wire2str_tag_scan(d, dlen, s, slen);
 999         case LDNS_RDF_TYPE_LONG_STR:
1000                 return sldns_wire2str_long_str_scan(d, dlen, s, slen);
1001         case LDNS_RDF_TYPE_TSIGERROR:
1002                 return sldns_wire2str_tsigerror_scan(d, dlen, s, slen);
1003         }
1004         /* unknown rdf type */
1005         return -1;
1006 }
1007
1008 int sldns_wire2str_int8_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1009 {
1010         int w;
1011         if(*dl < 1) return -1;
1012         w = sldns_str_print(s, sl, "%u", (unsigned)**d);
1013         (*d)++;
1014         (*dl)--;
1015         return w;
1016 }
1017
1018 int sldns_wire2str_int16_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1019 {
1020         int w;
1021         if(*dl < 2) return -1;
1022         w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint16(*d));
1023         (*d)+=2;
1024         (*dl)-=2;
1025         return w;
1026 }
1027
1028 int sldns_wire2str_int32_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1029 {
1030         int w;
1031         if(*dl < 4) return -1;
1032         w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint32(*d));
1033         (*d)+=4;
1034         (*dl)-=4;
1035         return w;
1036 }
1037
1038 int sldns_wire2str_period_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1039 {
1040         int w;
1041         if(*dl < 4) return -1;
1042         w = sldns_str_print(s, sl, "%u", (unsigned)sldns_read_uint32(*d));
1043         (*d)+=4;
1044         (*dl)-=4;
1045         return w;
1046 }
1047
1048 int sldns_wire2str_tsigtime_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1049 {
1050         /* tsigtime is 48 bits network order unsigned integer */
1051         int w;
1052         uint64_t tsigtime = 0;
1053         uint64_t d0, d1, d2, d3, d4, d5;
1054         if(*dl < 6) return -1;
1055         d0 = (*d)[0]; /* cast to uint64 for shift operations */
1056         d1 = (*d)[1];
1057         d2 = (*d)[2];
1058         d3 = (*d)[3];
1059         d4 = (*d)[4];
1060         d5 = (*d)[5];
1061         tsigtime = (d0<<40) | (d1<<32) | (d2<<24) | (d3<<16) | (d4<<8) | d5;
1062 #ifndef USE_WINSOCK
1063         w = sldns_str_print(s, sl, "%llu", (long long)tsigtime);
1064 #else
1065         w = sldns_str_print(s, sl, "%I64u", (long long)tsigtime);
1066 #endif
1067         (*d)+=6;
1068         (*dl)-=6;
1069         return w;
1070 }
1071
1072 int sldns_wire2str_a_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1073 {
1074         char buf[32];
1075         int w;
1076         if(*dl < 4) return -1;
1077         if(!inet_ntop(AF_INET, *d, buf, (socklen_t)sizeof(buf)))
1078                 return -1;
1079         w = sldns_str_print(s, sl, "%s", buf);
1080         (*d)+=4;
1081         (*dl)-=4;
1082         return w;
1083 }
1084
1085 int sldns_wire2str_aaaa_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1086 {
1087 #ifdef AF_INET6
1088         char buf[64];
1089         int w;
1090         if(*dl < 16) return -1;
1091         if(!inet_ntop(AF_INET6, *d, buf, (socklen_t)sizeof(buf)))
1092                 return -1;
1093         w = sldns_str_print(s, sl, "%s", buf);
1094         (*d)+=16;
1095         (*dl)-=16;
1096         return w;
1097 #else
1098         return -1;
1099 #endif
1100 }
1101
1102 /** printout escaped TYPE_STR character */
1103 static int str_char_print(char** s, size_t* sl, uint8_t c)
1104 {
1105         if(isprint((unsigned char)c) || c == '\t') {
1106                 if(c == '\"' || c == '\\')
1107                         return sldns_str_print(s, sl, "\\%c", c);
1108                 if(*sl) {
1109                         **s = (char)c;
1110                         (*s)++;
1111                         (*sl)--;
1112                 }
1113                 return 1;
1114         }
1115         return sldns_str_print(s, sl, "\\%03u", (unsigned)c);
1116 }
1117
1118 int sldns_wire2str_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1119 {
1120         int w = 0;
1121         size_t i, len;
1122         if(*dl < 1) return -1;
1123         len = **d;
1124         if(*dl < 1+len) return -1;
1125         (*d)++;
1126         (*dl)--;
1127         w += sldns_str_print(s, sl, "\"");
1128         for(i=0; i<len; i++)
1129                 w += str_char_print(s, sl, (*d)[i]);
1130         w += sldns_str_print(s, sl, "\"");
1131         (*d)+=len;
1132         (*dl)-=len;
1133         return w;
1134 }
1135
1136 int sldns_wire2str_apl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1137 {
1138         int i, w = 0;
1139         uint16_t family;
1140         uint8_t negation, prefix, adflength;
1141         if(*dl < 4) return -1;
1142         family = sldns_read_uint16(*d);
1143         prefix = (*d)[2];
1144         negation = ((*d)[3] & LDNS_APL_NEGATION);
1145         adflength = ((*d)[3] & LDNS_APL_MASK);
1146         if(*dl < 4+(size_t)adflength) return -1;
1147         if(family != LDNS_APL_IP4 && family != LDNS_APL_IP6)
1148                 return -1; /* unknown address family */
1149         if(negation)
1150                 w += sldns_str_print(s, sl, "!");
1151         w += sldns_str_print(s, sl, "%u:", (unsigned)family);
1152         if(family == LDNS_APL_IP4) {
1153                 /* check if prefix <32 ? */
1154                 /* address is variable length 0 - 4 */
1155                 for(i=0; i<4; i++) {
1156                         if(i > 0)
1157                                 w += sldns_str_print(s, sl, ".");
1158                         if(i < (int)adflength)
1159                                 w += sldns_str_print(s, sl, "%d", (*d)[4+i]);
1160                         else    w += sldns_str_print(s, sl, "0");
1161                 }
1162         } else if(family == LDNS_APL_IP6) {
1163                 /* check if prefix <128 ? */
1164                 /* address is variable length 0 - 16 */
1165                 for(i=0; i<16; i++) {
1166                         if(i%2 == 0 && i>0)
1167                                 w += sldns_str_print(s, sl, ":");
1168                         if(i < (int)adflength)
1169                                 w += sldns_str_print(s, sl, "%02x", (*d)[4+i]);
1170                         else    w += sldns_str_print(s, sl, "00");
1171                 }
1172         }
1173         w += sldns_str_print(s, sl, "/%u", (unsigned)prefix);
1174         (*d) += 4+adflength;
1175         (*dl) -= 4+adflength;
1176         return w;
1177 }
1178
1179 int sldns_wire2str_b32_ext_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1180 {
1181         size_t datalen;
1182         size_t sz;
1183         if(*dl < 1) return -1;
1184         datalen = (*d)[0];
1185         if(*dl < 1+datalen) return -1;
1186         sz = sldns_b32_ntop_calculate_size(datalen);
1187         if(*sl < sz+1) {
1188                 (*d) += datalen+1;
1189                 (*dl) -= (datalen+1);
1190                 return (int)sz; /* out of space really, but would need buffer
1191                         in order to truncate the output */
1192         }
1193         sldns_b32_ntop_extended_hex((*d)+1, datalen, *s, *sl);
1194         (*d) += datalen+1;
1195         (*dl) -= (datalen+1);
1196         (*s) += sz;
1197         (*sl) -= sz;
1198         return (int)sz;
1199 }
1200
1201 /** scan number of bytes from wire into b64 presentation format */
1202 static int sldns_wire2str_b64_scan_num(uint8_t** d, size_t* dl, char** s,
1203         size_t* sl, size_t num)
1204 {
1205         /* b64_ntop_calculate size includes null at the end */
1206         size_t sz = sldns_b64_ntop_calculate_size(num)-1;
1207         if(*sl < sz+1) {
1208                 (*d) += num;
1209                 (*dl) -= num;
1210                 return (int)sz; /* out of space really, but would need buffer
1211                         in order to truncate the output */
1212         }
1213         sldns_b64_ntop(*d, num, *s, *sl);
1214         (*d) += num;
1215         (*dl) -= num;
1216         (*s) += sz;
1217         (*sl) -= sz;
1218         return (int)sz;
1219 }
1220
1221 int sldns_wire2str_b64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1222 {
1223         return sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1224 }
1225
1226 int sldns_wire2str_hex_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1227 {
1228         return print_remainder_hex("", d, dl, s, sl);
1229 }
1230
1231 int sldns_wire2str_nsec_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1232 {
1233         uint8_t* p = *d;
1234         size_t pl = *dl;
1235         unsigned i, bit, window, block_len;
1236         uint16_t t;
1237         int w = 0;
1238
1239         /* check for errors */
1240         while(pl) {
1241                 if(pl < 2) return -1;
1242                 block_len = (unsigned)p[1];
1243                 if(pl < 2+block_len) return -1;
1244                 p += block_len+2;
1245                 pl -= block_len+2;
1246         }
1247
1248         /* do it */
1249         p = *d;
1250         pl = *dl;
1251         while(pl) {
1252                 if(pl < 2) return -1; /* cannot happen */
1253                 window = (unsigned)p[0];
1254                 block_len = (unsigned)p[1];
1255                 if(pl < 2+block_len) return -1; /* cannot happen */
1256                 p += 2;
1257                 for(i=0; i<block_len; i++) {
1258                         if(p[i] == 0) continue;
1259                         /* base type number for this octet */
1260                         t = ((window)<<8) | (i << 3);
1261                         for(bit=0; bit<8; bit++) {
1262                                 if((p[i]&(0x80>>bit))) {
1263                                         if(w) w += sldns_str_print(s, sl, " ");
1264                                         w += sldns_wire2str_type_print(s, sl,
1265                                                 t+bit);
1266                                 }
1267                         }
1268                 }
1269                 p += block_len;
1270                 pl -= block_len+2;
1271         }
1272         (*d) += *dl;
1273         (*dl) = 0;
1274         return w;
1275 }
1276
1277 int sldns_wire2str_nsec3_salt_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1278 {
1279         size_t salt_len;
1280         int w;
1281         if(*dl < 1) return -1;
1282         salt_len = (size_t)(*d)[0];
1283         if(*dl < 1+salt_len) return -1;
1284         (*d)++;
1285         (*dl)--;
1286         if(salt_len == 0) {
1287                 return sldns_str_print(s, sl, "-");
1288         }
1289         w = print_hex_buf(s, sl, *d, salt_len);
1290         (*dl)-=salt_len;
1291         (*d)+=salt_len;
1292         return w;
1293 }
1294
1295 int sldns_wire2str_cert_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1296 {
1297         sldns_lookup_table *lt;
1298         int data, w;
1299         if(*dl < 2) return -1;
1300         data = (int)sldns_read_uint16(*d);
1301         lt = sldns_lookup_by_id(sldns_cert_algorithms, data);
1302         if(lt && lt->name)
1303                 w = sldns_str_print(s, sl, "%s", lt->name);
1304         else    w = sldns_str_print(s, sl, "%d", data);
1305         (*dl)-=2;
1306         (*d)+=2;
1307         return w;
1308 }
1309
1310 int sldns_wire2str_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1311 {
1312         /* don't use algorithm mnemonics in the presentation format
1313          * this kind of got sneaked into the rfc's */
1314         return sldns_wire2str_int8_scan(d, dl, s, sl);
1315 }
1316
1317 int sldns_wire2str_unknown_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1318 {
1319         return sldns_wire2str_rdata_unknown_scan(d, dl, s, sl);
1320 }
1321
1322 int sldns_wire2str_time_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1323 {
1324         /* create a YYYYMMDDHHMMSS string if possible */
1325         struct tm tm;
1326         char date_buf[16];
1327         uint32_t t;
1328         memset(&tm, 0, sizeof(tm));
1329         if(*dl < 4) return -1;
1330         t = sldns_read_uint32(*d);
1331         date_buf[15]=0;
1332         if(sldns_serial_arithmitics_gmtime_r(t, time(NULL), &tm) &&
1333                 strftime(date_buf, 15, "%Y%m%d%H%M%S", &tm)) {
1334                 (*d) += 4;
1335                 (*dl) -= 4;
1336                 return sldns_str_print(s, sl, "%s", date_buf);
1337         }
1338         return -1;
1339 }
1340
1341 static int
1342 loc_cm_print(char** str, size_t* sl, uint8_t mantissa, uint8_t exponent)
1343 {
1344         int w = 0;
1345         uint8_t i;
1346         /* is it 0.<two digits> ? */
1347         if(exponent < 2) {
1348                 if(exponent == 1)
1349                         mantissa *= 10;
1350                 return sldns_str_print(str, sl, "0.%02ld", (long)mantissa);
1351         }
1352         /* always <digit><string of zeros> */
1353         w += sldns_str_print(str, sl, "%d", (int)mantissa);
1354         for(i=0; i<exponent-2; i++)
1355                 w += sldns_str_print(str, sl, "0");
1356         return w;
1357 }
1358
1359 int sldns_wire2str_loc_scan(uint8_t** d, size_t* dl, char** str, size_t* sl)
1360 {
1361         /* we could do checking (ie degrees < 90 etc)? */
1362         uint8_t version;
1363         uint8_t size;
1364         uint8_t horizontal_precision;
1365         uint8_t vertical_precision;
1366         uint32_t longitude;
1367         uint32_t latitude;
1368         uint32_t altitude;
1369         char northerness;
1370         char easterness;
1371         uint32_t h;
1372         uint32_t m;
1373         double s;
1374         uint32_t equator = (uint32_t)1 << 31; /* 2**31 */
1375         int w = 0;
1376
1377         if(*dl < 16) return -1;
1378         version = (*d)[0];
1379         if(version != 0)
1380                 return sldns_wire2str_hex_scan(d, dl, str, sl);
1381         size = (*d)[1];
1382         horizontal_precision = (*d)[2];
1383         vertical_precision = (*d)[3];
1384
1385         latitude = sldns_read_uint32((*d)+4);
1386         longitude = sldns_read_uint32((*d)+8);
1387         altitude = sldns_read_uint32((*d)+12);
1388
1389         if (latitude > equator) {
1390                 northerness = 'N';
1391                 latitude = latitude - equator;
1392         } else {
1393                 northerness = 'S';
1394                 latitude = equator - latitude;
1395         }
1396         h = latitude / (1000 * 60 * 60);
1397         latitude = latitude % (1000 * 60 * 60);
1398         m = latitude / (1000 * 60);
1399         latitude = latitude % (1000 * 60);
1400         s = (double) latitude / 1000.0;
1401         w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1402                 h, m, s, northerness);
1403
1404         if (longitude > equator) {
1405                 easterness = 'E';
1406                 longitude = longitude - equator;
1407         } else {
1408                 easterness = 'W';
1409                 longitude = equator - longitude;
1410         }
1411         h = longitude / (1000 * 60 * 60);
1412         longitude = longitude % (1000 * 60 * 60);
1413         m = longitude / (1000 * 60);
1414         longitude = longitude % (1000 * 60);
1415         s = (double) longitude / (1000.0);
1416         w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1417                 h, m, s, easterness);
1418
1419         s = ((double) altitude) / 100;
1420         s -= 100000;
1421
1422         if(altitude%100 != 0)
1423                 w += sldns_str_print(str, sl, "%.2f", s);
1424         else
1425                 w += sldns_str_print(str, sl, "%.0f", s);
1426
1427         w += sldns_str_print(str, sl, "m ");
1428
1429         w += loc_cm_print(str, sl, (size & 0xf0) >> 4, size & 0x0f);
1430         w += sldns_str_print(str, sl, "m ");
1431
1432         w += loc_cm_print(str, sl, (horizontal_precision & 0xf0) >> 4,
1433                 horizontal_precision & 0x0f);
1434         w += sldns_str_print(str, sl, "m ");
1435
1436         w += loc_cm_print(str, sl, (vertical_precision & 0xf0) >> 4,
1437                 vertical_precision & 0x0f);
1438         w += sldns_str_print(str, sl, "m");
1439
1440         (*d)+=16;
1441         (*dl)-=16;
1442         return w;
1443 }
1444
1445 int sldns_wire2str_wks_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1446 {
1447         /* protocol, followed by bitmap of services */
1448         const char* proto_name = NULL;
1449         struct protoent *protocol;
1450         struct servent *service;
1451         uint8_t protocol_nr;
1452         int bit, port, w = 0;
1453         size_t i;
1454         /* we cannot print with strings because they
1455          * are not portable, the presentation format may
1456          * not be able to be read in on another computer.  */
1457         int print_symbols = 0;
1458
1459         /* protocol */
1460         if(*dl < 1) return -1;
1461         protocol_nr = (*d)[0];
1462         (*d)++;
1463         (*dl)--;
1464         protocol = getprotobynumber((int)protocol_nr);
1465         if(protocol && (protocol->p_name != NULL)) {
1466                 w += sldns_str_print(s, sl, "%s", protocol->p_name);
1467                 proto_name = protocol->p_name;
1468         } else  {
1469                 w += sldns_str_print(s, sl, "%u", (unsigned)protocol_nr);
1470         }
1471
1472         for(i=0; i<*dl; i++) {
1473                 if((*d)[i] == 0)
1474                         continue;
1475                 for(bit=0; bit<8; bit++) {
1476                         if(!(((*d)[i])&(0x80>>bit)))
1477                                 continue;
1478                         port = (int)i*8 + bit;
1479
1480                         if(!print_symbols)
1481                                 service = NULL;
1482                         else
1483                                 service = getservbyport(
1484                                         (int)htons((uint16_t)port), proto_name);
1485                         if(service && service->s_name)
1486                                 w += sldns_str_print(s, sl, " %s",
1487                                         service->s_name);
1488                         else    w += sldns_str_print(s, sl, " %u",
1489                                         (unsigned)port);
1490                 }
1491         }
1492
1493 #ifdef HAVE_ENDSERVENT
1494         endservent();
1495 #endif
1496 #ifdef HAVE_ENDPROTOENT
1497         endprotoent();
1498 #endif
1499         (*d) += *dl;
1500         (*dl) = 0;
1501         return w;
1502 }
1503
1504 int sldns_wire2str_nsap_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1505 {
1506         return print_remainder_hex("0x", d, dl, s, sl);
1507 }
1508
1509 int sldns_wire2str_atma_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1510 {
1511         return print_remainder_hex("", d, dl, s, sl);
1512 }
1513
1514 /* internal scan routine that can modify arguments on failure */
1515 static int sldns_wire2str_ipseckey_scan_internal(uint8_t** d, size_t* dl,
1516         char** s, size_t* sl, uint8_t* pkt, size_t pktlen)
1517 {
1518         /* http://www.ietf.org/internet-drafts/draft-ietf-ipseckey-rr-12.txt*/
1519         uint8_t precedence, gateway_type, algorithm;
1520         int w = 0;
1521
1522         if(*dl < 3) return -1;
1523         precedence = (*d)[0];
1524         gateway_type = (*d)[1];
1525         algorithm = (*d)[2];
1526         if(gateway_type > 3)
1527                 return -1; /* unknown */
1528         (*d)+=3;
1529         (*dl)-=3;
1530         w += sldns_str_print(s, sl, "%d %d %d ",
1531                 (int)precedence, (int)gateway_type, (int)algorithm);
1532
1533         switch(gateway_type) {
1534         case 0: /* no gateway */
1535                 w += sldns_str_print(s, sl, ".");
1536                 break;
1537         case 1: /* ip4 */
1538                 w += sldns_wire2str_a_scan(d, dl, s, sl);
1539                 break;
1540         case 2: /* ip6 */
1541                 w += sldns_wire2str_aaaa_scan(d, dl, s, sl);
1542                 break;
1543         case 3: /* dname */
1544                 w += sldns_wire2str_dname_scan(d, dl, s, sl, pkt, pktlen);
1545                 break;
1546         default: /* unknown */
1547                 return -1;
1548         }
1549
1550         if(*dl < 1)
1551                 return -1;
1552         w += sldns_str_print(s, sl, " ");
1553         w += sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1554         return w;
1555 }
1556
1557 int sldns_wire2str_ipseckey_scan(uint8_t** d, size_t* dl, char** s, size_t* sl,
1558         uint8_t* pkt, size_t pktlen)
1559 {
1560         uint8_t* od = *d;
1561         char* os = *s;
1562         size_t odl = *dl, osl = *sl;
1563         int w=sldns_wire2str_ipseckey_scan_internal(d, dl, s, sl, pkt, pktlen);
1564         if(w == -1) {
1565                 *d = od;
1566                 *s = os;
1567                 *dl = odl;
1568                 *sl = osl;
1569                 return -1;
1570         }
1571         return w;
1572 }
1573
1574 int sldns_wire2str_hip_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1575 {
1576         int w;
1577         uint8_t algo, hitlen;
1578         uint16_t pklen;
1579
1580         /* read lengths */
1581         if(*dl < 4)
1582                 return -1;
1583         hitlen = (*d)[0];
1584         algo = (*d)[1];
1585         pklen = sldns_read_uint16((*d)+2);
1586         if(*dl < (size_t)4 + (size_t)hitlen + (size_t)pklen)
1587                 return -1;
1588
1589         /* write: algo hit pubkey */
1590         w = sldns_str_print(s, sl, "%u ", (unsigned)algo);
1591         w += print_hex_buf(s, sl, (*d)+4, hitlen);
1592         w += sldns_str_print(s, sl, " ");
1593         (*d)+=4+hitlen;
1594         (*dl)-= (4+hitlen);
1595         w += sldns_wire2str_b64_scan_num(d, dl, s, sl, pklen);
1596         return w;
1597 }
1598
1599 int sldns_wire2str_int16_data_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1600 {
1601         int w;
1602         uint16_t n;
1603         if(*dl < 2)
1604                 return -1;
1605         n = sldns_read_uint16(*d);
1606         if(*dl < 2+(size_t)n)
1607                 return -1;
1608         (*d)+=2;
1609         (*dl)-=2;
1610         if(n == 0) {
1611                 return sldns_str_print(s, sl, "0");
1612         }
1613         w = sldns_str_print(s, sl, "%u ", (unsigned)n);
1614         w += sldns_wire2str_b64_scan_num(d, dl, s, sl, n);
1615         return w;
1616 }
1617
1618 int sldns_wire2str_nsec3_next_owner_scan(uint8_t** d, size_t* dl, char** s,
1619         size_t* sl)
1620 {
1621         return sldns_wire2str_b32_ext_scan(d, dl, s, sl);
1622 }
1623
1624 int sldns_wire2str_ilnp64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1625 {
1626         int w;
1627         if(*dl < 8)
1628                 return -1;
1629         w = sldns_str_print(s, sl, "%.4x:%.4x:%.4x:%.4x",
1630                 sldns_read_uint16(*d), sldns_read_uint16((*d)+2),
1631                 sldns_read_uint16((*d)+4), sldns_read_uint16((*d)+6));
1632         (*d)+=8;
1633         (*dl)-=8;
1634         return w;
1635 }
1636
1637 int sldns_wire2str_eui48_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1638 {
1639         int w;
1640         if(*dl < 6)
1641                 return -1;
1642         w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
1643                 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5]);
1644         (*d)+=6;
1645         (*dl)-=6;
1646         return w;
1647 }
1648
1649 int sldns_wire2str_eui64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1650 {
1651         int w;
1652         if(*dl < 8)
1653                 return -1;
1654         w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
1655                 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5],
1656                 (*d)[6], (*d)[7]);
1657         (*d)+=8;
1658         (*dl)-=8;
1659         return w;
1660 }
1661
1662 int sldns_wire2str_tag_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1663 {
1664         size_t i, n;
1665         int w = 0;
1666         if(*dl < 1)
1667                 return -1;
1668         n = (size_t)((*d)[0]);
1669         if(*dl < 1+n)
1670                 return -1;
1671         for(i=0; i<n; i++)
1672                 if(!isalnum((unsigned char)(*d)[i+1]))
1673                         return -1;
1674         for(i=0; i<n; i++)
1675                 w += sldns_str_print(s, sl, "%c", (char)(*d)[i+1]);
1676         (*d)+=n+1;
1677         (*dl)-=(n+1);
1678         return w;
1679 }
1680
1681 int sldns_wire2str_long_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1682 {
1683         size_t i;
1684         int w = 0;
1685         w += sldns_str_print(s, sl, "\"");
1686         for(i=0; i<*dl; i++)
1687                 w += str_char_print(s, sl, (*d)[i]);
1688         w += sldns_str_print(s, sl, "\"");
1689         (*d)+=*dl;
1690         (*dl)=0;
1691         return w;
1692 }
1693
1694 int sldns_wire2str_tsigerror_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1695 {
1696         sldns_lookup_table *lt;
1697         int data, w;
1698         if(*dl < 2) return -1;
1699         data = (int)sldns_read_uint16(*d);
1700         lt = sldns_lookup_by_id(sldns_tsig_errors, data);
1701         if(lt && lt->name)
1702                 w = sldns_str_print(s, sl, "%s", lt->name);
1703         else    w = sldns_str_print(s, sl, "%d", data);
1704         (*dl)-=2;
1705         (*d)+=2;
1706         return w;
1707 }
1708
1709 int sldns_wire2str_edns_llq_print(char** s, size_t* sl, uint8_t* data,
1710         size_t len)
1711 {
1712         /* LLQ constants */
1713         const char* llq_errors[] = {"NO-ERROR", "SERV-FULL", "STATIC",
1714                 "FORMAT-ERR", "NO-SUCH-LLQ", "BAD-VERS", "UNKNOWN_ERR"};
1715         const unsigned int llq_errors_num = 7;
1716         const char* llq_opcodes[] = {"LLQ-SETUP", "LLQ-REFRESH", "LLQ-EVENT"};
1717         const unsigned int llq_opcodes_num = 3;
1718         uint16_t version, llq_opcode, error_code;
1719         uint64_t llq_id;
1720         uint32_t lease_life; /* Requested or granted life of LLQ, in seconds */
1721         int w = 0;
1722
1723         /* read the record */
1724         if(len != 18) {
1725                 w += sldns_str_print(s, sl, "malformed LLQ ");
1726                 w += print_hex_buf(s, sl, data, len);
1727                 return w;
1728         }
1729         version = sldns_read_uint16(data);
1730         llq_opcode = sldns_read_uint16(data+2);
1731         error_code = sldns_read_uint16(data+4);
1732         memmove(&llq_id, data+6, sizeof(llq_id));
1733         lease_life = sldns_read_uint32(data+14);
1734
1735         /* print it */
1736         w += sldns_str_print(s, sl, "v%d ", (int)version);
1737         if(llq_opcode < llq_opcodes_num)
1738                 w += sldns_str_print(s, sl, "%s", llq_opcodes[llq_opcode]);
1739         else    w += sldns_str_print(s, sl, "opcode %d", (int)llq_opcode);
1740         if(error_code < llq_errors_num)
1741                 w += sldns_str_print(s, sl, " %s", llq_errors[error_code]);
1742         else    w += sldns_str_print(s, sl, " error %d", (int)error_code);
1743 #ifndef USE_WINSOCK
1744         w += sldns_str_print(s, sl, " id %llx lease-life %lu",
1745                 (unsigned long long)llq_id, (unsigned long)lease_life);
1746 #else
1747         w += sldns_str_print(s, sl, " id %I64x lease-life %lu",
1748                 (unsigned long long)llq_id, (unsigned long)lease_life);
1749 #endif
1750         return w;
1751 }
1752
1753 int sldns_wire2str_edns_ul_print(char** s, size_t* sl, uint8_t* data,
1754         size_t len)
1755 {
1756         uint32_t lease;
1757         int w = 0;
1758         if(len != 4) {
1759                 w += sldns_str_print(s, sl, "malformed UL ");
1760                 w += print_hex_buf(s, sl, data, len);
1761                 return w;
1762         }
1763         lease = sldns_read_uint32(data);
1764         w += sldns_str_print(s, sl, "lease %lu", (unsigned long)lease);
1765         return w;
1766 }
1767
1768 int sldns_wire2str_edns_nsid_print(char** s, size_t* sl, uint8_t* data,
1769         size_t len)
1770 {
1771         int w = 0;
1772         size_t i, printed=0;
1773         w += print_hex_buf(s, sl, data, len);
1774         for(i=0; i<len; i++) {
1775                 if(isprint((unsigned char)data[i]) || data[i] == '\t') {
1776                         if(!printed) {
1777                                 w += sldns_str_print(s, sl, " (");
1778                                 printed = 1;
1779                         }
1780                         w += sldns_str_print(s, sl, "%c", (char)data[i]);
1781                 }
1782         }
1783         if(printed)
1784                 w += sldns_str_print(s, sl, ")");
1785         return w;
1786 }
1787
1788 int sldns_wire2str_edns_dau_print(char** s, size_t* sl, uint8_t* data,
1789         size_t len)
1790 {
1791         sldns_lookup_table *lt;
1792         size_t i;
1793         int w = 0;
1794         for(i=0; i<len; i++) {
1795                 lt = sldns_lookup_by_id(sldns_algorithms, (int)data[i]);
1796                 if(lt && lt->name)
1797                         w += sldns_str_print(s, sl, " %s", lt->name);
1798                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1799         }
1800         return w;
1801 }
1802
1803 int sldns_wire2str_edns_dhu_print(char** s, size_t* sl, uint8_t* data,
1804         size_t len)
1805 {
1806         sldns_lookup_table *lt;
1807         size_t i;
1808         int w = 0;
1809         for(i=0; i<len; i++) {
1810                 lt = sldns_lookup_by_id(sldns_hashes, (int)data[i]);
1811                 if(lt && lt->name)
1812                         w += sldns_str_print(s, sl, " %s", lt->name);
1813                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1814         }
1815         return w;
1816 }
1817
1818 int sldns_wire2str_edns_n3u_print(char** s, size_t* sl, uint8_t* data,
1819         size_t len)
1820 {
1821         size_t i;
1822         int w = 0;
1823         for(i=0; i<len; i++) {
1824                 if(data[i] == 1)
1825                         w += sldns_str_print(s, sl, " SHA1");
1826                 else    w += sldns_str_print(s, sl, " %d", (int)data[i]);
1827         }
1828         return w;
1829 }
1830
1831 int sldns_wire2str_edns_subnet_print(char** s, size_t* sl, uint8_t* data,
1832         size_t len)
1833 {
1834         int w = 0;
1835         uint16_t family;
1836         uint8_t source, scope;
1837         if(len < 4) {
1838                 w += sldns_str_print(s, sl, "malformed subnet ");
1839                 w += print_hex_buf(s, sl, data, len);
1840                 return w;
1841         }
1842         family = sldns_read_uint16(data);
1843         source = data[2];
1844         scope = data[3];
1845         if(family == 1) {
1846                 /* IP4 */
1847                 char buf[64];
1848                 uint8_t ip4[4];
1849                 memset(ip4, 0, sizeof(ip4));
1850                 if(len-4 > 4) {
1851                         w += sldns_str_print(s, sl, "trailingdata:");
1852                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1853                         w += sldns_str_print(s, sl, " ");
1854                         len = 4+4;
1855                 }
1856                 memmove(ip4, data+4, len-4);
1857                 if(!inet_ntop(AF_INET, ip4, buf, (socklen_t)sizeof(buf))) {
1858                         w += sldns_str_print(s, sl, "ip4ntoperror ");
1859                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1860                 } else {
1861                         w += sldns_str_print(s, sl, "%s", buf);
1862                 }
1863         } else if(family == 2) {
1864                 /* IP6 */
1865                 char buf[64];
1866                 uint8_t ip6[16];
1867                 memset(ip6, 0, sizeof(ip6));
1868                 if(len-4 > 16) {
1869                         w += sldns_str_print(s, sl, "trailingdata:");
1870                         w += print_hex_buf(s, sl, data+4+16, len-4-16);
1871                         w += sldns_str_print(s, sl, " ");
1872                         len = 4+16;
1873                 }
1874                 memmove(ip6, data+4, len-4);
1875 #ifdef AF_INET6
1876                 if(!inet_ntop(AF_INET6, ip6, buf, (socklen_t)sizeof(buf))) {
1877                         w += sldns_str_print(s, sl, "ip6ntoperror ");
1878                         w += print_hex_buf(s, sl, data+4+4, len-4-4);
1879                 } else {
1880                         w += sldns_str_print(s, sl, "%s", buf);
1881                 }
1882 #else
1883                 w += print_hex_buf(s, sl, data+4+4, len-4-4);
1884 #endif
1885         } else {
1886                 /* unknown */
1887                 w += sldns_str_print(s, sl, "family %d ",
1888                         (int)family);
1889                 w += print_hex_buf(s, sl, data, len);
1890         }
1891         w += sldns_str_print(s, sl, "/%d scope /%d", (int)source, (int)scope);
1892         return w;
1893 }
1894
1895 static int sldns_wire2str_edns_keepalive_print(char** s, size_t* sl, uint8_t* data,
1896         size_t len)
1897 {
1898         int w = 0;
1899         uint16_t timeout;
1900         if(!(len == 0 || len == 2)) {
1901                 w += sldns_str_print(s, sl, "malformed keepalive ");
1902                 w += print_hex_buf(s, sl, data, len);
1903                 return w;
1904         }
1905         if(len == 0 ) {
1906                 w += sldns_str_print(s, sl, "no timeout value (only valid for client option) ");
1907         } else {
1908                 timeout = sldns_read_uint16(data);
1909                 w += sldns_str_print(s, sl, "timeout value in units of 100ms %u", (int)timeout);
1910         }
1911         return w;
1912 }
1913
1914 int sldns_wire2str_edns_option_print(char** s, size_t* sl,
1915         uint16_t option_code, uint8_t* optdata, size_t optlen)
1916 {
1917         int w = 0;
1918         w += sldns_wire2str_edns_option_code_print(s, sl, option_code);
1919         w += sldns_str_print(s, sl, ": ");
1920         switch(option_code) {
1921         case LDNS_EDNS_LLQ:
1922                 w += sldns_wire2str_edns_llq_print(s, sl, optdata, optlen);
1923                 break;
1924         case LDNS_EDNS_UL:
1925                 w += sldns_wire2str_edns_ul_print(s, sl, optdata, optlen);
1926                 break;
1927         case LDNS_EDNS_NSID:
1928                 w += sldns_wire2str_edns_nsid_print(s, sl, optdata, optlen);
1929                 break;
1930         case LDNS_EDNS_DAU:
1931                 w += sldns_wire2str_edns_dau_print(s, sl, optdata, optlen);
1932                 break;
1933         case LDNS_EDNS_DHU:
1934                 w += sldns_wire2str_edns_dhu_print(s, sl, optdata, optlen);
1935                 break;
1936         case LDNS_EDNS_N3U:
1937                 w += sldns_wire2str_edns_n3u_print(s, sl, optdata, optlen);
1938                 break;
1939         case LDNS_EDNS_CLIENT_SUBNET:
1940                 w += sldns_wire2str_edns_subnet_print(s, sl, optdata, optlen);
1941                 break;
1942          case LDNS_EDNS_KEEPALIVE:
1943                 w += sldns_wire2str_edns_keepalive_print(s, sl, optdata, optlen);
1944                 break;
1945         case LDNS_EDNS_PADDING:
1946                 w += print_hex_buf(s, sl, optdata, optlen);
1947                 break;
1948         default:
1949                 /* unknown option code */
1950                 w += print_hex_buf(s, sl, optdata, optlen);
1951                 break;
1952         }
1953         return w;
1954 }
1955
1956 /** print the edns options to string */
1957 static int
1958 print_edns_opts(char** s, size_t* sl, uint8_t* rdata, size_t rdatalen)
1959 {
1960         uint16_t option_code, option_len;
1961         int w = 0;
1962         while(rdatalen > 0) {
1963                 /* option name */
1964                 if(rdatalen < 4) {
1965                         w += sldns_str_print(s, sl, " ; malformed: ");
1966                         w += print_hex_buf(s, sl, rdata, rdatalen);
1967                         return w;
1968                 }
1969                 option_code = sldns_read_uint16(rdata);
1970                 option_len = sldns_read_uint16(rdata+2);
1971                 rdata += 4;
1972                 rdatalen -= 4;
1973
1974                 /* option value */
1975                 if(rdatalen < (size_t)option_len) {
1976                         w += sldns_str_print(s, sl, " ; malformed ");
1977                         w += sldns_wire2str_edns_option_code_print(s, sl,
1978                                 option_code);
1979                         w += sldns_str_print(s, sl, ": ");
1980                         w += print_hex_buf(s, sl, rdata, rdatalen);
1981                         return w;
1982                 }
1983                 w += sldns_str_print(s, sl, " ; ");
1984                 w += sldns_wire2str_edns_option_print(s, sl, option_code,
1985                         rdata, option_len);
1986                 rdata += option_len;
1987                 rdatalen -= option_len;
1988         }
1989         return w;
1990 }
1991
1992 int sldns_wire2str_edns_scan(uint8_t** data, size_t* data_len, char** str,
1993         size_t* str_len, uint8_t* pkt, size_t pktlen)
1994 {
1995         int w = 0;
1996         uint8_t ext_rcode, edns_version;
1997         uint16_t udpsize, edns_bits, rdatalen;
1998         w += sldns_str_print(str, str_len, "; EDNS:");
1999
2000         /* some input checks, domain name */
2001         if(*data_len < 1+10)
2002                 return w + print_remainder_hex("Error malformed 0x",
2003                         data, data_len, str, str_len);
2004         if(*data[0] != 0) {
2005                 return w + print_remainder_hex("Error nonrootdname 0x",
2006                         data, data_len, str, str_len);
2007         }
2008         (*data)++;
2009         (*data_len)--;
2010
2011         /* check type and read fixed contents */
2012         if(sldns_read_uint16((*data)) != LDNS_RR_TYPE_OPT) {
2013                 return w + print_remainder_hex("Error nottypeOPT 0x",
2014                         data, data_len, str, str_len);
2015         }
2016         udpsize = sldns_read_uint16((*data)+2);
2017         ext_rcode = (*data)[4];
2018         edns_version = (*data)[5];
2019         edns_bits = sldns_read_uint16((*data)+6);
2020         rdatalen = sldns_read_uint16((*data)+8);
2021         (*data)+=10;
2022         (*data_len)-=10;
2023
2024         w += sldns_str_print(str, str_len, " version: %u;",
2025                 (unsigned)edns_version);
2026         w += sldns_str_print(str, str_len, " flags:");
2027         if((edns_bits & LDNS_EDNS_MASK_DO_BIT))
2028                 w += sldns_str_print(str, str_len, " do");
2029         /* the extended rcode is the value set, shifted four bits,
2030          * and or'd with the original rcode */
2031         if(ext_rcode) {
2032                 int rc = ((int)ext_rcode)<<4;
2033                 if(pkt && pktlen >= LDNS_HEADER_SIZE)
2034                         rc |= LDNS_RCODE_WIRE(pkt);
2035                 w += sldns_str_print(str, str_len, " ; ext-rcode: %d", rc);
2036         }
2037         w += sldns_str_print(str, str_len, " ; udp: %u", (unsigned)udpsize);
2038
2039         if(rdatalen) {
2040                 if((size_t)*data_len < rdatalen) {
2041                         w += sldns_str_print(str, str_len,
2042                                 " ; Error EDNS rdata too short; ");
2043                         rdatalen = (uint16_t)*data_len;
2044                 }
2045                 w += print_edns_opts(str, str_len, *data, rdatalen);
2046                 (*data) += rdatalen;
2047                 (*data_len) -= rdatalen;
2048         }
2049         w += sldns_str_print(str, str_len, "\n");
2050         return w;
2051 }