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 #include "util/data/dname.h"
26 #ifdef HAVE_TIME_H
27 #include <time.h>
28 #endif
29 #include <sys/time.h>
30 #include <stdarg.h>
31 #include <ctype.h>
32 #ifdef HAVE_NETDB_H
33 #include <netdb.h>
34 #endif
35
36 /* lookup tables for standard DNS stuff */
37 /* Taken from RFC 2535, section 7. */
38 static sldns_lookup_table sldns_algorithms_data[] = {
39 { LDNS_RSAMD5, "RSAMD5" },
40 { LDNS_DH, "DH" },
41 { LDNS_DSA, "DSA" },
42 { LDNS_ECC, "ECC" },
43 { LDNS_RSASHA1, "RSASHA1" },
44 { LDNS_DSA_NSEC3, "DSA-NSEC3-SHA1" },
45 { LDNS_RSASHA1_NSEC3, "RSASHA1-NSEC3-SHA1" },
46 { LDNS_RSASHA256, "RSASHA256"},
47 { LDNS_RSASHA512, "RSASHA512"},
48 { LDNS_ECC_GOST, "ECC-GOST"},
49 { LDNS_ECDSAP256SHA256, "ECDSAP256SHA256"},
50 { LDNS_ECDSAP384SHA384, "ECDSAP384SHA384"},
51 { LDNS_ED25519, "ED25519"},
52 { LDNS_ED448, "ED448"},
53 { LDNS_INDIRECT, "INDIRECT" },
54 { LDNS_PRIVATEDNS, "PRIVATEDNS" },
55 { LDNS_PRIVATEOID, "PRIVATEOID" },
56 { 0, NULL }
57 };
58 sldns_lookup_table* sldns_algorithms = sldns_algorithms_data;
59
60 /* hash algorithms in DS record */
61 static sldns_lookup_table sldns_hashes_data[] = {
62 { LDNS_SHA1, "SHA1" },
63 { LDNS_SHA256, "SHA256" },
64 { LDNS_HASH_GOST, "HASH-GOST" },
65 { LDNS_SHA384, "SHA384" },
66 { 0, NULL }
67 };
68 sldns_lookup_table* sldns_hashes = sldns_hashes_data;
69
70 /* Taken from RFC 4398 */
71 static sldns_lookup_table sldns_cert_algorithms_data[] = {
72 { LDNS_CERT_PKIX, "PKIX" },
73 { LDNS_CERT_SPKI, "SPKI" },
74 { LDNS_CERT_PGP, "PGP" },
75 { LDNS_CERT_IPKIX, "IPKIX" },
76 { LDNS_CERT_ISPKI, "ISPKI" },
77 { LDNS_CERT_IPGP, "IPGP" },
78 { LDNS_CERT_ACPKIX, "ACPKIX" },
79 { LDNS_CERT_IACPKIX, "IACPKIX" },
80 { LDNS_CERT_URI, "URI" },
81 { LDNS_CERT_OID, "OID" },
82 { 0, NULL }
83 };
84 sldns_lookup_table* sldns_cert_algorithms = sldns_cert_algorithms_data;
85
86 /* if these are used elsewhere */
87 static sldns_lookup_table sldns_rcodes_data[] = {
88 { LDNS_RCODE_NOERROR, "NOERROR" },
89 { LDNS_RCODE_FORMERR, "FORMERR" },
90 { LDNS_RCODE_SERVFAIL, "SERVFAIL" },
91 { LDNS_RCODE_NXDOMAIN, "NXDOMAIN" },
92 { LDNS_RCODE_NOTIMPL, "NOTIMPL" },
93 { LDNS_RCODE_REFUSED, "REFUSED" },
94 { LDNS_RCODE_YXDOMAIN, "YXDOMAIN" },
95 { LDNS_RCODE_YXRRSET, "YXRRSET" },
96 { LDNS_RCODE_NXRRSET, "NXRRSET" },
97 { LDNS_RCODE_NOTAUTH, "NOTAUTH" },
98 { LDNS_RCODE_NOTZONE, "NOTZONE" },
99 { 0, NULL }
100 };
101 sldns_lookup_table* sldns_rcodes = sldns_rcodes_data;
102
103 static sldns_lookup_table sldns_opcodes_data[] = {
104 { LDNS_PACKET_QUERY, "QUERY" },
105 { LDNS_PACKET_IQUERY, "IQUERY" },
106 { LDNS_PACKET_STATUS, "STATUS" },
107 { LDNS_PACKET_NOTIFY, "NOTIFY" },
108 { LDNS_PACKET_UPDATE, "UPDATE" },
109 { 0, NULL }
110 };
111 sldns_lookup_table* sldns_opcodes = sldns_opcodes_data;
112
113 static sldns_lookup_table sldns_wireparse_errors_data[] = {
114 { LDNS_WIREPARSE_ERR_OK, "no parse error" },
115 { LDNS_WIREPARSE_ERR_GENERAL, "parse error" },
116 { LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, "Domainname length overflow" },
117 { LDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, "Domainname length underflow (zero length)" },
118 { LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, "buffer too small" },
119 { LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, "Label length overflow" },
120 { LDNS_WIREPARSE_ERR_EMPTY_LABEL, "Empty label" },
121 { LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE, "Syntax error, bad escape sequence" },
122 { LDNS_WIREPARSE_ERR_SYNTAX, "Syntax error, could not parse the RR" },
123 { LDNS_WIREPARSE_ERR_SYNTAX_TTL, "Syntax error, could not parse the RR's TTL" },
124 { LDNS_WIREPARSE_ERR_SYNTAX_TYPE, "Syntax error, could not parse the RR's type" },
125 { LDNS_WIREPARSE_ERR_SYNTAX_CLASS, "Syntax error, could not parse the RR's class" },
126 { LDNS_WIREPARSE_ERR_SYNTAX_RDATA, "Syntax error, could not parse the RR's rdata" },
127 { LDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE, "Syntax error, value expected" },
128 { LDNS_WIREPARSE_ERR_INVALID_STR, "Conversion error, string expected" },
129 { LDNS_WIREPARSE_ERR_SYNTAX_B64, "Conversion error, b64 encoding expected" },
130 { LDNS_WIREPARSE_ERR_SYNTAX_B32_EXT, "Conversion error, b32 ext encoding expected" },
131 { LDNS_WIREPARSE_ERR_SYNTAX_HEX, "Conversion error, hex encoding expected" },
132 { LDNS_WIREPARSE_ERR_CERT_BAD_ALGORITHM, "Bad algorithm type for CERT record" },
133 { LDNS_WIREPARSE_ERR_SYNTAX_TIME, "Conversion error, time encoding expected" },
134 { LDNS_WIREPARSE_ERR_SYNTAX_PERIOD, "Conversion error, time period encoding expected" },
135 { LDNS_WIREPARSE_ERR_SYNTAX_ILNP64, "Conversion error, 4 colon separated hex numbers expected" },
136 { LDNS_WIREPARSE_ERR_SYNTAX_EUI48,
137 "Conversion error, 6 two character hex numbers "
138 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx" },
139 { LDNS_WIREPARSE_ERR_SYNTAX_EUI64,
140 "Conversion error, 8 two character hex numbers "
141 "separated by dashes expected (i.e. xx-xx-xx-xx-xx-xx-xx-xx" },
142 { LDNS_WIREPARSE_ERR_SYNTAX_TAG,
143 "Conversion error, a non-zero sequence of US-ASCII letters "
144 "and numbers in lower case expected" },
145 { LDNS_WIREPARSE_ERR_NOT_IMPL, "not implemented" },
146 { LDNS_WIREPARSE_ERR_SYNTAX_INT, "Conversion error, integer expected" },
147 { LDNS_WIREPARSE_ERR_SYNTAX_IP4, "Conversion error, ip4 addr expected" },
148 { LDNS_WIREPARSE_ERR_SYNTAX_IP6, "Conversion error, ip6 addr expected" },
149 { LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW, "Syntax error, integer overflow" },
150 { LDNS_WIREPARSE_ERR_INCLUDE, "$INCLUDE directive was seen in the zone" },
151 { LDNS_WIREPARSE_ERR_PARENTHESIS, "Parse error, parenthesis mismatch" },
152 { LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY, "Unknown SvcParamKey"},
153 { LDNS_WIREPARSE_ERR_SVCB_MISSING_PARAM, "SvcParam is missing a SvcParamValue"},
154 { LDNS_WIREPARSE_ERR_SVCB_DUPLICATE_KEYS, "Duplicate SVCB key found"},
155 { LDNS_WIREPARSE_ERR_SVCB_MANDATORY_TOO_MANY_KEYS, "Too many keys in mandatory" },
156 { LDNS_WIREPARSE_ERR_SVCB_TOO_MANY_PARAMS,
157 "Too many SvcParams. Unbound only allows 63 entries" },
158 { LDNS_WIREPARSE_ERR_SVCB_MANDATORY_MISSING_PARAM,
159 "Mandatory SvcParamKey is missing"},
160 { LDNS_WIREPARSE_ERR_SVCB_MANDATORY_DUPLICATE_KEY,
161 "Keys in SvcParam mandatory MUST be unique" },
162 { LDNS_WIREPARSE_ERR_SVCB_MANDATORY_IN_MANDATORY,
163 "mandatory MUST not be included as mandatory parameter" },
164 { LDNS_WIREPARSE_ERR_SVCB_PORT_VALUE_SYNTAX,
165 "Could not parse port SvcParamValue" },
166 { LDNS_WIREPARSE_ERR_SVCB_IPV4_TOO_MANY_ADDRESSES,
167 "Too many IPv4 addresses in ipv4hint" },
168 { LDNS_WIREPARSE_ERR_SVCB_IPV6_TOO_MANY_ADDRESSES,
169 "Too many IPv6 addresses in ipv6hint" },
170 { LDNS_WIREPARSE_ERR_SVCB_ALPN_KEY_TOO_LARGE,
171 "Alpn strings need to be smaller than 255 chars"},
172 { LDNS_WIREPARSE_ERR_SVCB_NO_DEFAULT_ALPN_VALUE,
173 "No-default-alpn should not have a value" },
174 { LDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA,
175 "General SVCParam error" },
176 { 0, NULL }
177 };
178 sldns_lookup_table* sldns_wireparse_errors = sldns_wireparse_errors_data;
179
180 static sldns_lookup_table sldns_edns_flags_data[] = {
181 { 3600, "do"},
182 { 0, NULL}
183 };
184 sldns_lookup_table* sldns_edns_flags = sldns_edns_flags_data;
185
186 static sldns_lookup_table sldns_edns_options_data[] = {
187 { 1, "LLQ" },
188 { 2, "UL" },
189 { 3, "NSID" },
190 /* 4 draft-cheshire-edns0-owner-option */
191 { 5, "DAU" },
192 { 6, "DHU" },
193 { 7, "N3U" },
194 { 8, "edns-client-subnet" },
195 { 10, "COOKIE" },
196 { 11, "edns-tcp-keepalive"},
197 { 12, "Padding" },
198 { 15, "EDE"},
199 { 0, NULL}
200 };
201 sldns_lookup_table* sldns_edns_options = sldns_edns_options_data;
202
203 /* From RFC8914 5.2 Table 3, the "Extended DNS Error Codes" registry. */
204 static sldns_lookup_table sldns_edns_ede_codes_data[] = {
205 { LDNS_EDE_NONE, "None" },
206 { LDNS_EDE_OTHER, "Other Error" },
207 { LDNS_EDE_UNSUPPORTED_DNSKEY_ALG, "Unsupported DNSKEY Algorithm" },
208 { LDNS_EDE_UNSUPPORTED_DS_DIGEST, "Unsupported DS Digest Type" },
209 { LDNS_EDE_STALE_ANSWER, "Stale Answer" },
210 { LDNS_EDE_FORGED_ANSWER, "Forged Answer" },
211 { LDNS_EDE_DNSSEC_INDETERMINATE, "DNSSEC Indeterminate" },
212 { LDNS_EDE_DNSSEC_BOGUS, "DNSSEC Bogus" },
213 { LDNS_EDE_SIGNATURE_EXPIRED, "Signature Expired" },
214 { LDNS_EDE_SIGNATURE_NOT_YET_VALID, "Signature Not Yet Valid" },
215 { LDNS_EDE_DNSKEY_MISSING, "DNSKEY Missing" },
216 { LDNS_EDE_RRSIGS_MISSING, "RRSIGs Missing" },
217 { LDNS_EDE_NO_ZONE_KEY_BIT_SET, "No Zone Key Bit Set" },
218 { LDNS_EDE_NSEC_MISSING, "NSEC Missing" },
219 { LDNS_EDE_CACHED_ERROR, "Cached Error" },
220 { LDNS_EDE_NOT_READY, "Not Ready" },
221 { LDNS_EDE_BLOCKED, "Blocked" },
222 { LDNS_EDE_CENSORED, "Censored" },
223 { LDNS_EDE_FILTERED, "Filtered" },
224 { LDNS_EDE_PROHIBITED, "Prohibited" },
225 { LDNS_EDE_STALE_NXDOMAIN_ANSWER, "Stale NXDOMAIN Answer" },
226 { LDNS_EDE_NOT_AUTHORITATIVE, "Not Authoritative" },
227 { LDNS_EDE_NOT_SUPPORTED, "Not Supported" },
228 { LDNS_EDE_NO_REACHABLE_AUTHORITY, "No Reachable Authority" },
229 { LDNS_EDE_NETWORK_ERROR, "Network Error" },
230 { LDNS_EDE_INVALID_DATA, "Invalid Data" },
231 { LDNS_EDE_SIGNATURE_EXPIRED_BEFORE_VALID, "Signature Expired Before Valid" },
232 { LDNS_EDE_TOO_EARLY, "Non-Replayable Transactions Received in 0-RTT Data" },
233 { LDNS_EDE_UNSUPPORTED_NSEC3_ITERATIONS, "Unsupported NSEC3 Iterations Value" },
234 { LDNS_EDE_BADPROXYPOLICY, "Unable to Conform to Policy" },
235 { LDNS_EDE_SYNTHESIZED, "Synthesized Answer" },
236 { 0, NULL}
237 };
238 sldns_lookup_table* sldns_edns_ede_codes = sldns_edns_ede_codes_data;
239
240 static sldns_lookup_table sldns_tsig_errors_data[] = {
241 { LDNS_TSIG_ERROR_NOERROR, "NOERROR" },
242 { LDNS_RCODE_FORMERR, "FORMERR" },
243 { LDNS_RCODE_SERVFAIL, "SERVFAIL" },
244 { LDNS_RCODE_NXDOMAIN, "NXDOMAIN" },
245 { LDNS_RCODE_NOTIMPL, "NOTIMPL" },
246 { LDNS_RCODE_REFUSED, "REFUSED" },
247 { LDNS_RCODE_YXDOMAIN, "YXDOMAIN" },
248 { LDNS_RCODE_YXRRSET, "YXRRSET" },
249 { LDNS_RCODE_NXRRSET, "NXRRSET" },
250 { LDNS_RCODE_NOTAUTH, "NOTAUTH" },
251 { LDNS_RCODE_NOTZONE, "NOTZONE" },
252 { LDNS_TSIG_ERROR_BADSIG, "BADSIG" },
253 { LDNS_TSIG_ERROR_BADKEY, "BADKEY" },
254 { LDNS_TSIG_ERROR_BADTIME, "BADTIME" },
255 { LDNS_TSIG_ERROR_BADMODE, "BADMODE" },
256 { LDNS_TSIG_ERROR_BADNAME, "BADNAME" },
257 { LDNS_TSIG_ERROR_BADALG, "BADALG" },
258 { 0, NULL }
259 };
260 sldns_lookup_table* sldns_tsig_errors = sldns_tsig_errors_data;
261
262 /* draft-ietf-dnsop-svcb-https-06: 6. Initial SvcParamKeys */
263 const char *svcparamkey_strs[] = {
264 "mandatory", "alpn", "no-default-alpn", "port",
265 "ipv4hint", "ech", "ipv6hint", "dohpath"
266 };
267
sldns_wire2str_pkt(uint8_t * data,size_t len)268 char* sldns_wire2str_pkt(uint8_t* data, size_t len)
269 {
270 size_t slen = (size_t)sldns_wire2str_pkt_buf(data, len, NULL, 0);
271 char* result = (char*)malloc(slen+1);
272 if(!result) return NULL;
273 sldns_wire2str_pkt_buf(data, len, result, slen+1);
274 return result;
275 }
276
sldns_wire2str_rr(uint8_t * rr,size_t len)277 char* sldns_wire2str_rr(uint8_t* rr, size_t len)
278 {
279 size_t slen = (size_t)sldns_wire2str_rr_buf(rr, len, NULL, 0);
280 char* result = (char*)malloc(slen+1);
281 if(!result) return NULL;
282 sldns_wire2str_rr_buf(rr, len, result, slen+1);
283 return result;
284 }
285
sldns_wire2str_type(uint16_t rrtype)286 char* sldns_wire2str_type(uint16_t rrtype)
287 {
288 char buf[16];
289 sldns_wire2str_type_buf(rrtype, buf, sizeof(buf));
290 return strdup(buf);
291 }
292
sldns_wire2str_class(uint16_t rrclass)293 char* sldns_wire2str_class(uint16_t rrclass)
294 {
295 char buf[16];
296 sldns_wire2str_class_buf(rrclass, buf, sizeof(buf));
297 return strdup(buf);
298 }
299
sldns_wire2str_dname(uint8_t * dname,size_t dname_len)300 char* sldns_wire2str_dname(uint8_t* dname, size_t dname_len)
301 {
302 size_t slen=(size_t)sldns_wire2str_dname_buf(dname, dname_len, NULL, 0);
303 char* result = (char*)malloc(slen+1);
304 if(!result) return NULL;
305 sldns_wire2str_dname_buf(dname, dname_len, result, slen+1);
306 return result;
307 }
308
sldns_wire2str_rcode(int rcode)309 char* sldns_wire2str_rcode(int rcode)
310 {
311 char buf[16];
312 sldns_wire2str_rcode_buf(rcode, buf, sizeof(buf));
313 return strdup(buf);
314 }
315
sldns_wire2str_pkt_buf(uint8_t * d,size_t dlen,char * s,size_t slen)316 int sldns_wire2str_pkt_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
317 {
318 /* use arguments as temporary variables */
319 return sldns_wire2str_pkt_scan(&d, &dlen, &s, &slen);
320 }
321
sldns_wire2str_rr_buf(uint8_t * d,size_t dlen,char * s,size_t slen)322 int sldns_wire2str_rr_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
323 {
324 /* use arguments as temporary variables */
325 return sldns_wire2str_rr_scan(&d, &dlen, &s, &slen, NULL, 0, NULL);
326 }
327
sldns_wire2str_rrquestion_buf(uint8_t * d,size_t dlen,char * s,size_t slen)328 int sldns_wire2str_rrquestion_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
329 {
330 /* use arguments as temporary variables */
331 return sldns_wire2str_rrquestion_scan(&d, &dlen, &s, &slen, NULL, 0, NULL);
332 }
333
sldns_wire2str_rdata_buf(uint8_t * rdata,size_t rdata_len,char * str,size_t str_len,uint16_t rrtype)334 int sldns_wire2str_rdata_buf(uint8_t* rdata, size_t rdata_len, char* str,
335 size_t str_len, uint16_t rrtype)
336 {
337 /* use arguments as temporary variables */
338 return sldns_wire2str_rdata_scan(&rdata, &rdata_len, &str, &str_len,
339 rrtype, NULL, 0, NULL);
340 }
341
sldns_wire2str_rr_unknown_buf(uint8_t * d,size_t dlen,char * s,size_t slen)342 int sldns_wire2str_rr_unknown_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
343 {
344 /* use arguments as temporary variables */
345 return sldns_wire2str_rr_unknown_scan(&d, &dlen, &s, &slen, NULL, 0, NULL);
346 }
347
sldns_wire2str_rr_comment_buf(uint8_t * rr,size_t rrlen,size_t dname_len,char * s,size_t slen)348 int sldns_wire2str_rr_comment_buf(uint8_t* rr, size_t rrlen, size_t dname_len,
349 char* s, size_t slen)
350 {
351 uint16_t rrtype = sldns_wirerr_get_type(rr, rrlen, dname_len);
352 return sldns_wire2str_rr_comment_print(&s, &slen, rr, rrlen, dname_len,
353 rrtype);
354 }
355
sldns_wire2str_type_buf(uint16_t rrtype,char * s,size_t slen)356 int sldns_wire2str_type_buf(uint16_t rrtype, char* s, size_t slen)
357 {
358 /* use arguments as temporary variables */
359 return sldns_wire2str_type_print(&s, &slen, rrtype);
360 }
361
sldns_wire2str_class_buf(uint16_t rrclass,char * s,size_t slen)362 int sldns_wire2str_class_buf(uint16_t rrclass, char* s, size_t slen)
363 {
364 /* use arguments as temporary variables */
365 return sldns_wire2str_class_print(&s, &slen, rrclass);
366 }
367
sldns_wire2str_rcode_buf(int rcode,char * s,size_t slen)368 int sldns_wire2str_rcode_buf(int rcode, char* s, size_t slen)
369 {
370 /* use arguments as temporary variables */
371 return sldns_wire2str_rcode_print(&s, &slen, rcode);
372 }
373
sldns_wire2str_opcode_buf(int opcode,char * s,size_t slen)374 int sldns_wire2str_opcode_buf(int opcode, char* s, size_t slen)
375 {
376 /* use arguments as temporary variables */
377 return sldns_wire2str_opcode_print(&s, &slen, opcode);
378 }
379
sldns_wire2str_dname_buf(uint8_t * d,size_t dlen,char * s,size_t slen)380 int sldns_wire2str_dname_buf(uint8_t* d, size_t dlen, char* s, size_t slen)
381 {
382 /* use arguments as temporary variables */
383 return sldns_wire2str_dname_scan(&d, &dlen, &s, &slen, NULL, 0, NULL);
384 }
385
sldns_str_vprint(char ** str,size_t * slen,const char * format,va_list args)386 int sldns_str_vprint(char** str, size_t* slen, const char* format, va_list args)
387 {
388 int w = vsnprintf(*str, *slen, format, args);
389 if(w < 0) {
390 /* error in printout */
391 return 0;
392 } else if((size_t)w >= *slen) {
393 *str = NULL; /* we do not want str to point outside of buffer*/
394 *slen = 0;
395 } else {
396 *str += w;
397 *slen -= w;
398 }
399 return w;
400 }
401
sldns_str_print(char ** str,size_t * slen,const char * format,...)402 int sldns_str_print(char** str, size_t* slen, const char* format, ...)
403 {
404 int w;
405 va_list args;
406 va_start(args, format);
407 w = sldns_str_vprint(str, slen, format, args);
408 va_end(args);
409 return w;
410 }
411
412 /** print hex format into text buffer for specified length */
print_hex_buf(char ** s,size_t * slen,uint8_t * buf,size_t len)413 static int print_hex_buf(char** s, size_t* slen, uint8_t* buf, size_t len)
414 {
415 const char* hex = "0123456789ABCDEF";
416 size_t i;
417 for(i=0; i<len; i++) {
418 (void)sldns_str_print(s, slen, "%c%c", hex[(buf[i]&0xf0)>>4],
419 hex[buf[i]&0x0f]);
420 }
421 return (int)len*2;
422 }
423
424 /** print remainder of buffer in hex format with prefixed text */
print_remainder_hex(const char * pref,uint8_t ** d,size_t * dlen,char ** s,size_t * slen)425 static int print_remainder_hex(const char* pref, uint8_t** d, size_t* dlen,
426 char** s, size_t* slen)
427 {
428 int w = 0;
429 w += sldns_str_print(s, slen, "%s", pref);
430 w += print_hex_buf(s, slen, *d, *dlen);
431 *d += *dlen;
432 *dlen = 0;
433 return w;
434 }
435
sldns_wire2str_pkt_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)436 int sldns_wire2str_pkt_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
437 {
438 int w = 0, comprloop = 0;
439 unsigned qdcount, ancount, nscount, arcount, i;
440 uint8_t* pkt = *d;
441 size_t pktlen = *dlen;
442 if(*dlen >= LDNS_HEADER_SIZE) {
443 qdcount = (unsigned)LDNS_QDCOUNT(*d);
444 ancount = (unsigned)LDNS_ANCOUNT(*d);
445 nscount = (unsigned)LDNS_NSCOUNT(*d);
446 arcount = (unsigned)LDNS_ARCOUNT(*d);
447 } else {
448 qdcount = ancount = nscount = arcount = 0;
449 }
450 w += sldns_wire2str_header_scan(d, dlen, s, slen);
451 w += sldns_str_print(s, slen, "\n");
452 w += sldns_str_print(s, slen, ";; QUESTION SECTION:\n");
453 for(i=0; i<qdcount; i++) {
454 w += sldns_wire2str_rrquestion_scan(d, dlen, s, slen,
455 pkt, pktlen, &comprloop);
456 if(!*dlen) break;
457 }
458 w += sldns_str_print(s, slen, "\n");
459 w += sldns_str_print(s, slen, ";; ANSWER SECTION:\n");
460 for(i=0; i<ancount; i++) {
461 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen, &comprloop);
462 if(!*dlen) break;
463 }
464 w += sldns_str_print(s, slen, "\n");
465 w += sldns_str_print(s, slen, ";; AUTHORITY SECTION:\n");
466 for(i=0; i<nscount; i++) {
467 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen, &comprloop);
468 if(!*dlen) break;
469 }
470 w += sldns_str_print(s, slen, "\n");
471 w += sldns_str_print(s, slen, ";; ADDITIONAL SECTION:\n");
472 for(i=0; i<arcount; i++) {
473 w += sldns_wire2str_rr_scan(d, dlen, s, slen, pkt, pktlen, &comprloop);
474 if(!*dlen) break;
475 }
476 /* other fields: WHEN(time), SERVER(IP) not available here. */
477 w += sldns_str_print(s, slen, ";; MSG SIZE rcvd: %d\n", (int)pktlen);
478 if(*dlen > 0) {
479 w += print_remainder_hex(";; trailing garbage 0x",
480 d, dlen, s, slen);
481 w += sldns_str_print(s, slen, "\n");
482 }
483 return w;
484 }
485
486 /** scan type, class and ttl and printout, for rr */
sldns_rr_tcttl_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)487 static int sldns_rr_tcttl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
488 {
489 int w = 0;
490 uint16_t t, c;
491 uint32_t ttl;
492 if(*dl < 8) {
493 if(*dl < 4)
494 return w + print_remainder_hex("; Error malformed 0x",
495 d, dl, s, sl);
496 /* these print values or 0x.. if none left */
497 t = sldns_read_uint16(*d);
498 c = sldns_read_uint16((*d)+2);
499 (*d)+=4;
500 (*dl)-=4;
501 w += sldns_wire2str_class_print(s, sl, c);
502 w += sldns_str_print(s, sl, "\t");
503 w += sldns_wire2str_type_print(s, sl, t);
504 if(*dl == 0)
505 return w + sldns_str_print(s, sl, "; Error no ttl");
506 return w + print_remainder_hex(
507 "; Error malformed ttl 0x", d, dl, s, sl);
508 }
509 t = sldns_read_uint16(*d);
510 c = sldns_read_uint16((*d)+2);
511 ttl = sldns_read_uint32((*d)+4);
512 (*d)+=8;
513 (*dl)-=8;
514 w += sldns_str_print(s, sl, "%lu\t", (unsigned long)ttl);
515 w += sldns_wire2str_class_print(s, sl, c);
516 w += sldns_str_print(s, sl, "\t");
517 w += sldns_wire2str_type_print(s, sl, t);
518 return w;
519 }
520
sldns_wire2str_rr_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,uint8_t * pkt,size_t pktlen,int * comprloop)521 int sldns_wire2str_rr_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
522 uint8_t* pkt, size_t pktlen, int* comprloop)
523 {
524 int w = 0;
525 uint8_t* rr = *d;
526 size_t rrlen = *dlen, dname_off, rdlen, ordlen;
527 uint16_t rrtype = 0;
528
529 if(*dlen >= 3 && (*d)[0]==0 &&
530 sldns_read_uint16((*d)+1)==LDNS_RR_TYPE_OPT) {
531 /* perform EDNS OPT processing */
532 return sldns_wire2str_edns_scan(d, dlen, s, slen, pkt, pktlen);
533 }
534
535 /* try to scan the rdata with pretty-printing, but if that fails, then
536 * scan the rdata as an unknown RR type */
537 w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen, comprloop);
538 w += sldns_str_print(s, slen, "\t");
539 dname_off = rrlen-(*dlen);
540 if(*dlen == 4) {
541 /* like a question-RR */
542 uint16_t t = sldns_read_uint16(*d);
543 uint16_t c = sldns_read_uint16((*d)+2);
544 (*d)+=4;
545 (*dlen)-=4;
546 w += sldns_wire2str_class_print(s, slen, c);
547 w += sldns_str_print(s, slen, "\t");
548 w += sldns_wire2str_type_print(s, slen, t);
549 w += sldns_str_print(s, slen, " ; Error no ttl,rdata\n");
550 return w;
551 }
552 if(*dlen < 8) {
553 if(*dlen == 0)
554 return w + sldns_str_print(s, slen, ";Error missing RR\n");
555 w += print_remainder_hex(";Error partial RR 0x", d, dlen, s, slen);
556 return w + sldns_str_print(s, slen, "\n");
557 }
558 rrtype = sldns_read_uint16(*d);
559 w += sldns_rr_tcttl_scan(d, dlen, s, slen);
560 w += sldns_str_print(s, slen, "\t");
561
562 /* rdata */
563 if(*dlen < 2) {
564 if(*dlen == 0)
565 return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
566 w += print_remainder_hex(";Error missing rdatalen 0x",
567 d, dlen, s, slen);
568 return w + sldns_str_print(s, slen, "\n");
569 }
570 rdlen = sldns_read_uint16(*d);
571 ordlen = rdlen;
572 (*d)+=2;
573 (*dlen)-=2;
574 if(*dlen < rdlen) {
575 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
576 if(*dlen == 0)
577 return w + sldns_str_print(s, slen, ";Error missing rdata\n");
578 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
579 return w + sldns_str_print(s, slen, "\n");
580 }
581 w += sldns_wire2str_rdata_scan(d, &rdlen, s, slen, rrtype, pkt, pktlen,
582 comprloop);
583 (*dlen) -= (ordlen-rdlen);
584
585 /* default comment */
586 w += sldns_wire2str_rr_comment_print(s, slen, rr, rrlen, dname_off,
587 rrtype);
588 w += sldns_str_print(s, slen, "\n");
589 return w;
590 }
591
sldns_wire2str_rrquestion_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,uint8_t * pkt,size_t pktlen,int * comprloop)592 int sldns_wire2str_rrquestion_scan(uint8_t** d, size_t* dlen, char** s,
593 size_t* slen, uint8_t* pkt, size_t pktlen, int* comprloop)
594 {
595 int w = 0;
596 uint16_t t, c;
597 w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen, comprloop);
598 w += sldns_str_print(s, slen, "\t");
599 if(*dlen < 4) {
600 if(*dlen == 0)
601 return w + sldns_str_print(s, slen, "Error malformed\n");
602 w += print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
603 return w + sldns_str_print(s, slen, "\n");
604 }
605 t = sldns_read_uint16(*d);
606 c = sldns_read_uint16((*d)+2);
607 (*d)+=4;
608 (*dlen)-=4;
609 w += sldns_wire2str_class_print(s, slen, c);
610 w += sldns_str_print(s, slen, "\t");
611 w += sldns_wire2str_type_print(s, slen, t);
612 w += sldns_str_print(s, slen, "\n");
613 return w;
614 }
615
sldns_wire2str_rr_unknown_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,uint8_t * pkt,size_t pktlen,int * comprloop)616 int sldns_wire2str_rr_unknown_scan(uint8_t** d, size_t* dlen, char** s,
617 size_t* slen, uint8_t* pkt, size_t pktlen, int* comprloop)
618 {
619 size_t rdlen, ordlen;
620 int w = 0;
621 w += sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen, comprloop);
622 w += sldns_str_print(s, slen, "\t");
623 w += sldns_rr_tcttl_scan(d, dlen, s, slen);
624 w += sldns_str_print(s, slen, "\t");
625 if(*dlen < 2) {
626 if(*dlen == 0)
627 return w + sldns_str_print(s, slen, ";Error missing rdatalen\n");
628 w += print_remainder_hex(";Error missing rdatalen 0x",
629 d, dlen, s, slen);
630 return w + sldns_str_print(s, slen, "\n");
631 }
632 rdlen = sldns_read_uint16(*d);
633 ordlen = rdlen;
634 (*d) += 2;
635 (*dlen) -= 2;
636 if(*dlen < rdlen) {
637 w += sldns_str_print(s, slen, "\\# %u ", (unsigned)rdlen);
638 if(*dlen == 0)
639 return w + sldns_str_print(s, slen, ";Error missing rdata\n");
640 w += print_remainder_hex(";Error partial rdata 0x", d, dlen, s, slen);
641 return w + sldns_str_print(s, slen, "\n");
642 }
643 w += sldns_wire2str_rdata_unknown_scan(d, &rdlen, s, slen);
644 (*dlen) -= (ordlen-rdlen);
645 w += sldns_str_print(s, slen, "\n");
646 return w;
647 }
648
649 /** print rr comment for type DNSKEY */
rr_comment_dnskey(char ** s,size_t * slen,uint8_t * rr,size_t rrlen,size_t dname_off)650 static int rr_comment_dnskey(char** s, size_t* slen, uint8_t* rr,
651 size_t rrlen, size_t dname_off)
652 {
653 size_t rdlen;
654 uint8_t* rdata;
655 int flags, w = 0;
656 if(rrlen < dname_off + 10) return 0;
657 rdlen = sldns_read_uint16(rr+dname_off+8);
658 if(rrlen < dname_off + 10 + rdlen) return 0;
659 if(rdlen < 2) return 0;
660 rdata = rr + dname_off + 10;
661 flags = (int)sldns_read_uint16(rdata);
662 w += sldns_str_print(s, slen, " ;{");
663
664 /* id */
665 w += sldns_str_print(s, slen, "id = %u",
666 sldns_calc_keytag_raw(rdata, rdlen));
667
668 /* flags */
669 if((flags&LDNS_KEY_ZONE_KEY)) {
670 if((flags&LDNS_KEY_SEP_KEY))
671 w += sldns_str_print(s, slen, " (ksk)");
672 else w += sldns_str_print(s, slen, " (zsk)");
673 }
674
675 /* keysize */
676 if(rdlen > 4) {
677 w += sldns_str_print(s, slen, ", ");
678 w += sldns_str_print(s, slen, "size = %db",
679 (int)sldns_rr_dnskey_key_size_raw(
680 (unsigned char*)rdata+4, rdlen-4, (int)(rdata[3])));
681 }
682
683 w += sldns_str_print(s, slen, "}");
684 return w;
685 }
686
687 /** print rr comment for type RRSIG */
rr_comment_rrsig(char ** s,size_t * slen,uint8_t * rr,size_t rrlen,size_t dname_off)688 static int rr_comment_rrsig(char** s, size_t* slen, uint8_t* rr,
689 size_t rrlen, size_t dname_off)
690 {
691 size_t rdlen;
692 uint8_t* rdata;
693 if(rrlen < dname_off + 10) return 0;
694 rdlen = sldns_read_uint16(rr+dname_off+8);
695 if(rrlen < dname_off + 10 + rdlen) return 0;
696 rdata = rr + dname_off + 10;
697 if(rdlen < 18) return 0;
698 return sldns_str_print(s, slen, " ;{id = %d}",
699 (int)sldns_read_uint16(rdata+16));
700 }
701
702 /** print rr comment for type NSEC3 */
rr_comment_nsec3(char ** s,size_t * slen,uint8_t * rr,size_t rrlen,size_t dname_off)703 static int rr_comment_nsec3(char** s, size_t* slen, uint8_t* rr,
704 size_t rrlen, size_t dname_off)
705 {
706 size_t rdlen;
707 uint8_t* rdata;
708 int w = 0;
709 if(rrlen < dname_off + 10) return 0;
710 rdlen = sldns_read_uint16(rr+dname_off+8);
711 if(rrlen < dname_off + 10 + rdlen) return 0;
712 rdata = rr + dname_off + 10;
713 if(rdlen < 2) return 0;
714 if((rdata[1] & LDNS_NSEC3_VARS_OPTOUT_MASK))
715 w += sldns_str_print(s, slen, " ;{flags: optout}");
716 return w;
717 }
718
sldns_wire2str_rr_comment_print(char ** s,size_t * slen,uint8_t * rr,size_t rrlen,size_t dname_off,uint16_t rrtype)719 int sldns_wire2str_rr_comment_print(char** s, size_t* slen, uint8_t* rr,
720 size_t rrlen, size_t dname_off, uint16_t rrtype)
721 {
722 if(rrtype == LDNS_RR_TYPE_DNSKEY) {
723 return rr_comment_dnskey(s, slen, rr, rrlen, dname_off);
724 } else if(rrtype == LDNS_RR_TYPE_RRSIG) {
725 return rr_comment_rrsig(s, slen, rr, rrlen, dname_off);
726 } else if(rrtype == LDNS_RR_TYPE_NSEC3) {
727 return rr_comment_nsec3(s, slen, rr, rrlen, dname_off);
728 }
729 return 0;
730 }
731
sldns_wire2str_header_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)732 int sldns_wire2str_header_scan(uint8_t** d, size_t* dlen, char** s,
733 size_t* slen)
734 {
735 int w = 0;
736 int opcode, rcode;
737 w += sldns_str_print(s, slen, ";; ->>HEADER<<- ");
738 if(*dlen == 0)
739 return w+sldns_str_print(s, slen, "Error empty packet");
740 if(*dlen < 4)
741 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
742 opcode = (int)LDNS_OPCODE_WIRE(*d);
743 rcode = (int)LDNS_RCODE_WIRE(*d);
744 w += sldns_str_print(s, slen, "opcode: ");
745 w += sldns_wire2str_opcode_print(s, slen, opcode);
746 w += sldns_str_print(s, slen, ", ");
747 w += sldns_str_print(s, slen, "rcode: ");
748 w += sldns_wire2str_rcode_print(s, slen, rcode);
749 w += sldns_str_print(s, slen, ", ");
750 w += sldns_str_print(s, slen, "id: %d\n", (int)LDNS_ID_WIRE(*d));
751 w += sldns_str_print(s, slen, ";; flags:");
752 if(LDNS_QR_WIRE(*d)) w += sldns_str_print(s, slen, " qr");
753 if(LDNS_AA_WIRE(*d)) w += sldns_str_print(s, slen, " aa");
754 if(LDNS_TC_WIRE(*d)) w += sldns_str_print(s, slen, " tc");
755 if(LDNS_RD_WIRE(*d)) w += sldns_str_print(s, slen, " rd");
756 if(LDNS_CD_WIRE(*d)) w += sldns_str_print(s, slen, " cd");
757 if(LDNS_RA_WIRE(*d)) w += sldns_str_print(s, slen, " ra");
758 if(LDNS_AD_WIRE(*d)) w += sldns_str_print(s, slen, " ad");
759 if(LDNS_Z_WIRE(*d)) w += sldns_str_print(s, slen, " z");
760 w += sldns_str_print(s, slen, " ; ");
761 if(*dlen < LDNS_HEADER_SIZE)
762 return w+print_remainder_hex("Error header too short 0x", d, dlen, s, slen);
763 w += sldns_str_print(s, slen, "QUERY: %d, ", (int)LDNS_QDCOUNT(*d));
764 w += sldns_str_print(s, slen, "ANSWER: %d, ", (int)LDNS_ANCOUNT(*d));
765 w += sldns_str_print(s, slen, "AUTHORITY: %d, ", (int)LDNS_NSCOUNT(*d));
766 w += sldns_str_print(s, slen, "ADDITIONAL: %d ", (int)LDNS_ARCOUNT(*d));
767 *d += LDNS_HEADER_SIZE;
768 *dlen -= LDNS_HEADER_SIZE;
769 return w;
770 }
771
sldns_wire2str_rdata_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,uint16_t rrtype,uint8_t * pkt,size_t pktlen,int * comprloop)772 int sldns_wire2str_rdata_scan(uint8_t** d, size_t* dlen, char** s,
773 size_t* slen, uint16_t rrtype, uint8_t* pkt, size_t pktlen,
774 int* comprloop)
775 {
776 /* try to prettyprint, but if that fails, use unknown format */
777 uint8_t* origd = *d;
778 char* origs = *s;
779 size_t origdlen = *dlen, origslen = *slen;
780 size_t r_cnt, r_max;
781 sldns_rdf_type rdftype;
782 int w = 0, n;
783
784 const sldns_rr_descriptor *desc = sldns_rr_descript(rrtype);
785 if(!desc) /* unknown format */
786 return sldns_wire2str_rdata_unknown_scan(d, dlen, s, slen);
787 /* dlen equals the rdatalen for the rdata */
788
789 r_max = sldns_rr_descriptor_maximum(desc);
790 for(r_cnt=0; r_cnt < r_max; r_cnt++) {
791 if(*dlen == 0) {
792 if(r_cnt < sldns_rr_descriptor_minimum(desc))
793 goto failed;
794 break; /* nothing more to print */
795 }
796 rdftype = sldns_rr_descriptor_field_type(desc, r_cnt);
797 if(r_cnt != 0)
798 w += sldns_str_print(s, slen, " ");
799 n = sldns_wire2str_rdf_scan(d, dlen, s, slen, rdftype,
800 pkt, pktlen, comprloop);
801 if(n == -1) {
802 failed:
803 /* failed, use unknown format */
804 *d = origd; *s = origs;
805 *dlen = origdlen; *slen = origslen;
806 return sldns_wire2str_rdata_unknown_scan(d, dlen,
807 s, slen);
808 }
809 w += n;
810 }
811 if(*dlen != 0) {
812 goto failed;
813 }
814 return w;
815 }
816
sldns_wire2str_rdata_unknown_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)817 int sldns_wire2str_rdata_unknown_scan(uint8_t** d, size_t* dlen, char** s,
818 size_t* slen)
819 {
820 int w = 0;
821
822 /* print length */
823 w += sldns_str_print(s, slen, "\\# %u", (unsigned)*dlen);
824
825 /* print rdlen in hex */
826 if(*dlen != 0)
827 w += sldns_str_print(s, slen, " ");
828 w += print_hex_buf(s, slen, *d, *dlen);
829 (*d) += *dlen;
830 (*dlen) = 0;
831 return w;
832 }
833
834 /** print and escape one character for a domain dname */
dname_char_print(char ** s,size_t * slen,uint8_t c)835 static int dname_char_print(char** s, size_t* slen, uint8_t c)
836 {
837 if(c == '.' || c == ';' || c == '(' || c == ')' || c == '\\')
838 return sldns_str_print(s, slen, "\\%c", c);
839 else if(!(isascii((unsigned char)c) && isgraph((unsigned char)c)))
840 return sldns_str_print(s, slen, "\\%03u", (unsigned)c);
841 /* plain printout */
842 if(*slen) {
843 **s = (char)c;
844 (*s)++;
845 (*slen)--;
846 }
847 return 1;
848 }
849
sldns_wire2str_dname_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,uint8_t * pkt,size_t pktlen,int * comprloop)850 int sldns_wire2str_dname_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
851 uint8_t* pkt, size_t pktlen, int* comprloop)
852 {
853 int w = 0;
854 /* spool labels onto the string, use compression if its there */
855 uint8_t* pos = *d;
856 unsigned i, counter=0;
857 unsigned maxcompr = MAX_COMPRESS_PTRS; /* loop detection, max compr ptrs */
858 int in_buf = 1;
859 size_t dname_len = 0;
860 if(comprloop) {
861 if(*comprloop != 0)
862 maxcompr = 30; /* for like ipv6 reverse name, per label */
863 if(*comprloop > 4)
864 maxcompr = 4; /* just don't want to spend time, any more */
865 }
866 if(*dlen == 0) return sldns_str_print(s, slen, "ErrorMissingDname");
867 if(*pos == 0) {
868 (*d)++;
869 (*dlen)--;
870 return sldns_str_print(s, slen, ".");
871 }
872 while((!pkt || pos < pkt+pktlen) && *pos) {
873 /* read label length */
874 uint8_t labellen = *pos++;
875 if(in_buf) { (*d)++; (*dlen)--; }
876
877 /* find out what sort of label we have */
878 if((labellen&0xc0) == 0xc0) {
879 /* compressed */
880 uint16_t target = 0;
881 if(in_buf && *dlen == 0)
882 return w + sldns_str_print(s, slen,
883 "ErrorPartialDname");
884 else if(!in_buf && pos+1 > pkt+pktlen)
885 return w + sldns_str_print(s, slen,
886 "ErrorPartialDname");
887 target = ((labellen&0x3f)<<8) | *pos;
888 if(in_buf) { (*d)++; (*dlen)--; }
889 /* move to target, if possible */
890 if(!pkt || target >= pktlen)
891 return w + sldns_str_print(s, slen,
892 "ErrorComprPtrOutOfBounds");
893 if(counter++ > maxcompr) {
894 if(comprloop && *comprloop < 10)
895 (*comprloop)++;
896 return w + sldns_str_print(s, slen,
897 "ErrorComprPtrLooped");
898 }
899 in_buf = 0;
900 pos = pkt+target;
901 continue;
902 } else if((labellen&0xc0)) {
903 /* notimpl label type */
904 w += sldns_str_print(s, slen,
905 "ErrorLABELTYPE%xIsUnknown",
906 (int)(labellen&0xc0));
907 return w;
908 }
909
910 /* spool label characters, end with '.' */
911 if(in_buf && *dlen < (size_t)labellen)
912 labellen = (uint8_t)*dlen;
913 else if(!in_buf && pos+(size_t)labellen > pkt+pktlen)
914 labellen = (uint8_t)(pkt + pktlen - pos);
915 dname_len += ((size_t)labellen)+1;
916 if(dname_len > LDNS_MAX_DOMAINLEN) {
917 /* dname_len counts the uncompressed length we have
918 * seen so far, and the domain name has become too
919 * long, prevent the loop from printing overly long
920 * content. */
921 w += sldns_str_print(s, slen,
922 "ErrorDomainNameTooLong");
923 return w;
924 }
925 for(i=0; i<(unsigned)labellen; i++) {
926 w += dname_char_print(s, slen, *pos++);
927 }
928 if(in_buf) {
929 (*d) += labellen;
930 (*dlen) -= labellen;
931 if(*dlen == 0) break;
932 }
933 w += sldns_str_print(s, slen, ".");
934 }
935 /* skip over final root label */
936 if(in_buf && *dlen > 0) { (*d)++; (*dlen)--; }
937 /* in case we printed no labels, terminate dname */
938 if(w == 0) w += sldns_str_print(s, slen, ".");
939 return w;
940 }
941
sldns_wire2str_opcode_print(char ** s,size_t * slen,int opcode)942 int sldns_wire2str_opcode_print(char** s, size_t* slen, int opcode)
943 {
944 sldns_lookup_table *lt = sldns_lookup_by_id(sldns_opcodes, opcode);
945 if (lt && lt->name) {
946 return sldns_str_print(s, slen, "%s", lt->name);
947 }
948 return sldns_str_print(s, slen, "OPCODE%u", (unsigned)opcode);
949 }
950
sldns_wire2str_rcode_print(char ** s,size_t * slen,int rcode)951 int sldns_wire2str_rcode_print(char** s, size_t* slen, int rcode)
952 {
953 sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rcodes, rcode);
954 if (lt && lt->name) {
955 return sldns_str_print(s, slen, "%s", lt->name);
956 }
957 return sldns_str_print(s, slen, "RCODE%u", (unsigned)rcode);
958 }
959
sldns_wire2str_class_print(char ** s,size_t * slen,uint16_t rrclass)960 int sldns_wire2str_class_print(char** s, size_t* slen, uint16_t rrclass)
961 {
962 sldns_lookup_table *lt = sldns_lookup_by_id(sldns_rr_classes,
963 (int)rrclass);
964 if (lt && lt->name) {
965 return sldns_str_print(s, slen, "%s", lt->name);
966 }
967 return sldns_str_print(s, slen, "CLASS%u", (unsigned)rrclass);
968 }
969
sldns_wire2str_type_print(char ** s,size_t * slen,uint16_t rrtype)970 int sldns_wire2str_type_print(char** s, size_t* slen, uint16_t rrtype)
971 {
972 const sldns_rr_descriptor *descriptor = sldns_rr_descript(rrtype);
973 if (descriptor && descriptor->_name) {
974 return sldns_str_print(s, slen, "%s", descriptor->_name);
975 }
976 return sldns_str_print(s, slen, "TYPE%u", (unsigned)rrtype);
977 }
978
sldns_wire2str_edns_option_code_print(char ** s,size_t * slen,uint16_t opcode)979 int sldns_wire2str_edns_option_code_print(char** s, size_t* slen,
980 uint16_t opcode)
981 {
982 sldns_lookup_table *lt = sldns_lookup_by_id(sldns_edns_options,
983 (int)opcode);
984 if (lt && lt->name) {
985 return sldns_str_print(s, slen, "%s", lt->name);
986 }
987 return sldns_str_print(s, slen, "OPT%u", (unsigned)opcode);
988 }
989
sldns_wire2str_class_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)990 int sldns_wire2str_class_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
991 {
992 uint16_t c;
993 if(*dlen == 0) return 0;
994 if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
995 c = sldns_read_uint16(*d);
996 (*d)+=2;
997 (*dlen)-=2;
998 return sldns_wire2str_class_print(s, slen, c);
999 }
1000
sldns_wire2str_type_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)1001 int sldns_wire2str_type_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
1002 {
1003 uint16_t t;
1004 if(*dlen == 0) return 0;
1005 if(*dlen < 2) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
1006 t = sldns_read_uint16(*d);
1007 (*d)+=2;
1008 (*dlen)-=2;
1009 return sldns_wire2str_type_print(s, slen, t);
1010 }
1011
sldns_wire2str_ttl_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)1012 int sldns_wire2str_ttl_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
1013 {
1014 uint32_t ttl;
1015 if(*dlen == 0) return 0;
1016 if(*dlen < 4) return print_remainder_hex("Error malformed 0x", d, dlen, s, slen);
1017 ttl = sldns_read_uint32(*d);
1018 (*d)+=4;
1019 (*dlen)-=4;
1020 return sldns_str_print(s, slen, "%u", (unsigned)ttl);
1021 }
1022
1023 static int
sldns_print_svcparamkey(char ** s,size_t * slen,uint16_t svcparamkey)1024 sldns_print_svcparamkey(char** s, size_t* slen, uint16_t svcparamkey)
1025 {
1026 if (svcparamkey < SVCPARAMKEY_COUNT) {
1027 return sldns_str_print(s, slen, "%s", svcparamkey_strs[svcparamkey]);
1028 }
1029 else {
1030 return sldns_str_print(s, slen, "key%d", (int)svcparamkey);
1031 }
1032 }
1033
sldns_wire2str_svcparam_port2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1034 static int sldns_wire2str_svcparam_port2str(char** s,
1035 size_t* slen, uint16_t data_len, uint8_t* data)
1036 {
1037 int w = 0;
1038
1039 if (data_len != 2)
1040 return -1; /* wireformat error, a short is 2 bytes */
1041 w = sldns_str_print(s, slen, "=%d", (int)sldns_read_uint16(data));
1042
1043 return w;
1044 }
1045
sldns_wire2str_svcparam_ipv4hint2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1046 static int sldns_wire2str_svcparam_ipv4hint2str(char** s,
1047 size_t* slen, uint16_t data_len, uint8_t* data)
1048 {
1049 char ip_str[INET_ADDRSTRLEN + 1];
1050
1051 int w = 0;
1052
1053 assert(data_len > 0);
1054
1055 if ((data_len % LDNS_IP4ADDRLEN) == 0) {
1056 if (inet_ntop(AF_INET, data, ip_str, sizeof(ip_str)) == NULL)
1057 return -1; /* wireformat error, incorrect size or inet family */
1058
1059 w += sldns_str_print(s, slen, "=%s", ip_str);
1060 data += LDNS_IP4ADDRLEN;
1061
1062 while ((data_len -= LDNS_IP4ADDRLEN) > 0) {
1063 if (inet_ntop(AF_INET, data, ip_str, sizeof(ip_str)) == NULL)
1064 return -1; /* wireformat error, incorrect size or inet family */
1065
1066 w += sldns_str_print(s, slen, ",%s", ip_str);
1067 data += LDNS_IP4ADDRLEN;
1068 }
1069 } else
1070 return -1;
1071
1072 return w;
1073 }
1074
sldns_wire2str_svcparam_ipv6hint2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1075 static int sldns_wire2str_svcparam_ipv6hint2str(char** s,
1076 size_t* slen, uint16_t data_len, uint8_t* data)
1077 {
1078 char ip_str[INET6_ADDRSTRLEN + 1];
1079
1080 int w = 0;
1081
1082 assert(data_len > 0);
1083
1084 if ((data_len % LDNS_IP6ADDRLEN) == 0) {
1085 if (inet_ntop(AF_INET6, data, ip_str, sizeof(ip_str)) == NULL)
1086 return -1; /* wireformat error, incorrect size or inet family */
1087
1088 w += sldns_str_print(s, slen, "=%s", ip_str);
1089 data += LDNS_IP6ADDRLEN;
1090
1091 while ((data_len -= LDNS_IP6ADDRLEN) > 0) {
1092 if (inet_ntop(AF_INET6, data, ip_str, sizeof(ip_str)) == NULL)
1093 return -1; /* wireformat error, incorrect size or inet family */
1094
1095 w += sldns_str_print(s, slen, ",%s", ip_str);
1096 data += LDNS_IP6ADDRLEN;
1097 }
1098 } else
1099 return -1;
1100
1101 return w;
1102 }
1103
sldns_wire2str_svcparam_mandatory2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1104 static int sldns_wire2str_svcparam_mandatory2str(char** s,
1105 size_t* slen, uint16_t data_len, uint8_t* data)
1106 {
1107 int w = 0;
1108
1109 assert(data_len > 0);
1110
1111 if (data_len % sizeof(uint16_t))
1112 return -1; /* wireformat error, data_len must be multiple of shorts */
1113 w += sldns_str_print(s, slen, "=");
1114 w += sldns_print_svcparamkey(s, slen, sldns_read_uint16(data));
1115 data += 2;
1116
1117 while ((data_len -= sizeof(uint16_t))) {
1118 w += sldns_str_print(s, slen, ",");
1119 w += sldns_print_svcparamkey(s, slen, sldns_read_uint16(data));
1120 data += 2;
1121 }
1122
1123 return w;
1124 }
1125
sldns_wire2str_svcparam_alpn2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1126 static int sldns_wire2str_svcparam_alpn2str(char** s,
1127 size_t* slen, uint16_t data_len, uint8_t* data)
1128 {
1129 uint8_t *dp = (void *)data;
1130 int w = 0;
1131
1132 assert(data_len > 0); /* Guaranteed by sldns_wire2str_svcparam_scan */
1133
1134 w += sldns_str_print(s, slen, "=\"");
1135 while (data_len) {
1136 /* alpn is list of length byte (str_len) followed by a string of that size */
1137 uint8_t i, str_len = *dp++;
1138
1139 if (str_len > --data_len)
1140 return -1;
1141
1142 for (i = 0; i < str_len; i++) {
1143 if (dp[i] == '"' || dp[i] == '\\')
1144 w += sldns_str_print(s, slen, "\\\\\\%c", dp[i]);
1145
1146 else if (dp[i] == ',')
1147 w += sldns_str_print(s, slen, "\\\\%c", dp[i]);
1148
1149 else if (!isprint(dp[i]))
1150 w += sldns_str_print(s, slen, "\\%03u", (unsigned) dp[i]);
1151
1152 else
1153 w += sldns_str_print(s, slen, "%c", dp[i]);
1154 }
1155 dp += str_len;
1156 if ((data_len -= str_len))
1157 w += sldns_str_print(s, slen, "%s", ",");
1158 }
1159 w += sldns_str_print(s, slen, "\"");
1160
1161 return w;
1162 }
1163
sldns_wire2str_svcparam_ech2str(char ** s,size_t * slen,uint16_t data_len,uint8_t * data)1164 static int sldns_wire2str_svcparam_ech2str(char** s,
1165 size_t* slen, uint16_t data_len, uint8_t* data)
1166 {
1167 int size;
1168 int w = 0;
1169
1170 assert(data_len > 0); /* Guaranteed by sldns_wire2str_svcparam_scan */
1171
1172 w += sldns_str_print(s, slen, "=\"");
1173
1174 if ((size = sldns_b64_ntop(data, data_len, *s, *slen)) < 0)
1175 return -1;
1176
1177 (*s) += size;
1178 (*slen) -= size;
1179
1180 w += sldns_str_print(s, slen, "\"");
1181
1182 return w + size;
1183 }
1184
sldns_wire2str_svcparam_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen)1185 int sldns_wire2str_svcparam_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen)
1186 {
1187 uint8_t ch;
1188 uint16_t svcparamkey, data_len;
1189 int written_chars = 0;
1190 int r, i;
1191
1192 /* verify that we have enough data to read svcparamkey and data_len */
1193 if(*dlen < 4)
1194 return -1;
1195
1196 svcparamkey = sldns_read_uint16(*d);
1197 data_len = sldns_read_uint16(*d+2);
1198 *d += 4;
1199 *dlen -= 4;
1200
1201 /* verify that we have data_len data */
1202 if (data_len > *dlen)
1203 return -1;
1204
1205 written_chars += sldns_print_svcparamkey(s, slen, svcparamkey);
1206 if (!data_len) {
1207
1208 /* Some SvcParams MUST have values */
1209 switch (svcparamkey) {
1210 case SVCB_KEY_ALPN:
1211 case SVCB_KEY_PORT:
1212 case SVCB_KEY_IPV4HINT:
1213 case SVCB_KEY_IPV6HINT:
1214 case SVCB_KEY_MANDATORY:
1215 case SVCB_KEY_DOHPATH:
1216 return -1;
1217 default:
1218 return written_chars;
1219 }
1220 }
1221
1222 switch (svcparamkey) {
1223 case SVCB_KEY_PORT:
1224 r = sldns_wire2str_svcparam_port2str(s, slen, data_len, *d);
1225 break;
1226 case SVCB_KEY_IPV4HINT:
1227 r = sldns_wire2str_svcparam_ipv4hint2str(s, slen, data_len, *d);
1228 break;
1229 case SVCB_KEY_IPV6HINT:
1230 r = sldns_wire2str_svcparam_ipv6hint2str(s, slen, data_len, *d);
1231 break;
1232 case SVCB_KEY_MANDATORY:
1233 r = sldns_wire2str_svcparam_mandatory2str(s, slen, data_len, *d);
1234 break;
1235 case SVCB_KEY_NO_DEFAULT_ALPN:
1236 return -1; /* wireformat error, should not have a value */
1237 case SVCB_KEY_ALPN:
1238 r = sldns_wire2str_svcparam_alpn2str(s, slen, data_len, *d);
1239 break;
1240 case SVCB_KEY_ECH:
1241 r = sldns_wire2str_svcparam_ech2str(s, slen, data_len, *d);
1242 break;
1243 case SVCB_KEY_DOHPATH:
1244 ATTR_FALLTHROUGH
1245 /* fallthrough */
1246 default:
1247 r = sldns_str_print(s, slen, "=\"");
1248
1249 for (i = 0; i < data_len; i++) {
1250 ch = (*d)[i];
1251
1252 if (ch == '"' || ch == '\\')
1253 r += sldns_str_print(s, slen, "\\%c", ch);
1254
1255 else if (!isprint(ch))
1256 r += sldns_str_print(s, slen, "\\%03u", (unsigned) ch);
1257
1258 else
1259 r += sldns_str_print(s, slen, "%c", ch);
1260
1261 }
1262 r += sldns_str_print(s, slen, "\"");
1263 break;
1264 }
1265 if (r <= 0)
1266 return -1; /* wireformat error */
1267
1268 written_chars += r;
1269 *d += data_len;
1270 *dlen -= data_len;
1271 return written_chars;
1272 }
1273
sldns_wire2str_rdf_scan(uint8_t ** d,size_t * dlen,char ** s,size_t * slen,int rdftype,uint8_t * pkt,size_t pktlen,int * comprloop)1274 int sldns_wire2str_rdf_scan(uint8_t** d, size_t* dlen, char** s, size_t* slen,
1275 int rdftype, uint8_t* pkt, size_t pktlen, int* comprloop)
1276 {
1277 if(*dlen == 0) return 0;
1278 switch(rdftype) {
1279 case LDNS_RDF_TYPE_NONE:
1280 return 0;
1281 case LDNS_RDF_TYPE_DNAME:
1282 return sldns_wire2str_dname_scan(d, dlen, s, slen, pkt, pktlen, comprloop);
1283 case LDNS_RDF_TYPE_INT8:
1284 return sldns_wire2str_int8_scan(d, dlen, s, slen);
1285 case LDNS_RDF_TYPE_INT16:
1286 return sldns_wire2str_int16_scan(d, dlen, s, slen);
1287 case LDNS_RDF_TYPE_INT32:
1288 return sldns_wire2str_int32_scan(d, dlen, s, slen);
1289 case LDNS_RDF_TYPE_PERIOD:
1290 return sldns_wire2str_period_scan(d, dlen, s, slen);
1291 case LDNS_RDF_TYPE_TSIGTIME:
1292 return sldns_wire2str_tsigtime_scan(d, dlen, s, slen);
1293 case LDNS_RDF_TYPE_A:
1294 return sldns_wire2str_a_scan(d, dlen, s, slen);
1295 case LDNS_RDF_TYPE_AAAA:
1296 return sldns_wire2str_aaaa_scan(d, dlen, s, slen);
1297 case LDNS_RDF_TYPE_STR:
1298 return sldns_wire2str_str_scan(d, dlen, s, slen);
1299 case LDNS_RDF_TYPE_APL:
1300 return sldns_wire2str_apl_scan(d, dlen, s, slen);
1301 case LDNS_RDF_TYPE_B32_EXT:
1302 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
1303 case LDNS_RDF_TYPE_B64:
1304 return sldns_wire2str_b64_scan(d, dlen, s, slen);
1305 case LDNS_RDF_TYPE_HEX:
1306 return sldns_wire2str_hex_scan(d, dlen, s, slen);
1307 case LDNS_RDF_TYPE_NSEC:
1308 return sldns_wire2str_nsec_scan(d, dlen, s, slen);
1309 case LDNS_RDF_TYPE_NSEC3_SALT:
1310 return sldns_wire2str_nsec3_salt_scan(d, dlen, s, slen);
1311 case LDNS_RDF_TYPE_TYPE:
1312 return sldns_wire2str_type_scan(d, dlen, s, slen);
1313 case LDNS_RDF_TYPE_CLASS:
1314 return sldns_wire2str_class_scan(d, dlen, s, slen);
1315 case LDNS_RDF_TYPE_CERT_ALG:
1316 return sldns_wire2str_cert_alg_scan(d, dlen, s, slen);
1317 case LDNS_RDF_TYPE_ALG:
1318 return sldns_wire2str_alg_scan(d, dlen, s, slen);
1319 case LDNS_RDF_TYPE_UNKNOWN:
1320 return sldns_wire2str_unknown_scan(d, dlen, s, slen);
1321 case LDNS_RDF_TYPE_TIME:
1322 return sldns_wire2str_time_scan(d, dlen, s, slen);
1323 case LDNS_RDF_TYPE_LOC:
1324 return sldns_wire2str_loc_scan(d, dlen, s, slen);
1325 case LDNS_RDF_TYPE_WKS:
1326 case LDNS_RDF_TYPE_SERVICE:
1327 return sldns_wire2str_wks_scan(d, dlen, s, slen);
1328 case LDNS_RDF_TYPE_NSAP:
1329 return sldns_wire2str_nsap_scan(d, dlen, s, slen);
1330 case LDNS_RDF_TYPE_ATMA:
1331 return sldns_wire2str_atma_scan(d, dlen, s, slen);
1332 case LDNS_RDF_TYPE_IPSECKEY:
1333 return sldns_wire2str_ipseckey_scan(d, dlen, s, slen, pkt,
1334 pktlen, comprloop);
1335 case LDNS_RDF_TYPE_HIP:
1336 return sldns_wire2str_hip_scan(d, dlen, s, slen);
1337 case LDNS_RDF_TYPE_INT16_DATA:
1338 return sldns_wire2str_int16_data_scan(d, dlen, s, slen);
1339 case LDNS_RDF_TYPE_NSEC3_NEXT_OWNER:
1340 return sldns_wire2str_b32_ext_scan(d, dlen, s, slen);
1341 case LDNS_RDF_TYPE_ILNP64:
1342 return sldns_wire2str_ilnp64_scan(d, dlen, s, slen);
1343 case LDNS_RDF_TYPE_EUI48:
1344 return sldns_wire2str_eui48_scan(d, dlen, s, slen);
1345 case LDNS_RDF_TYPE_EUI64:
1346 return sldns_wire2str_eui64_scan(d, dlen, s, slen);
1347 case LDNS_RDF_TYPE_TAG:
1348 return sldns_wire2str_tag_scan(d, dlen, s, slen);
1349 case LDNS_RDF_TYPE_LONG_STR:
1350 return sldns_wire2str_long_str_scan(d, dlen, s, slen);
1351 case LDNS_RDF_TYPE_SVCPARAM:
1352 return sldns_wire2str_svcparam_scan(d, dlen, s, slen);
1353 case LDNS_RDF_TYPE_TSIGERROR:
1354 return sldns_wire2str_tsigerror_scan(d, dlen, s, slen);
1355 }
1356 /* unknown rdf type */
1357 return -1;
1358 }
1359
sldns_wire2str_int8_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1360 int sldns_wire2str_int8_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1361 {
1362 int w;
1363 if(*dl < 1) return -1;
1364 w = sldns_str_print(s, sl, "%u", (unsigned)**d);
1365 (*d)++;
1366 (*dl)--;
1367 return w;
1368 }
1369
sldns_wire2str_int16_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1370 int sldns_wire2str_int16_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1371 {
1372 int w;
1373 if(*dl < 2) return -1;
1374 w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint16(*d));
1375 (*d)+=2;
1376 (*dl)-=2;
1377 return w;
1378 }
1379
sldns_wire2str_int32_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1380 int sldns_wire2str_int32_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1381 {
1382 int w;
1383 if(*dl < 4) return -1;
1384 w = sldns_str_print(s, sl, "%lu", (unsigned long)sldns_read_uint32(*d));
1385 (*d)+=4;
1386 (*dl)-=4;
1387 return w;
1388 }
1389
sldns_wire2str_period_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1390 int sldns_wire2str_period_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1391 {
1392 int w;
1393 if(*dl < 4) return -1;
1394 w = sldns_str_print(s, sl, "%u", (unsigned)sldns_read_uint32(*d));
1395 (*d)+=4;
1396 (*dl)-=4;
1397 return w;
1398 }
1399
sldns_wire2str_tsigtime_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1400 int sldns_wire2str_tsigtime_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1401 {
1402 /* tsigtime is 48 bits network order unsigned integer */
1403 int w;
1404 uint64_t tsigtime = 0;
1405 uint64_t d0, d1, d2, d3, d4, d5;
1406 if(*dl < 6) return -1;
1407 d0 = (*d)[0]; /* cast to uint64 for shift operations */
1408 d1 = (*d)[1];
1409 d2 = (*d)[2];
1410 d3 = (*d)[3];
1411 d4 = (*d)[4];
1412 d5 = (*d)[5];
1413 tsigtime = (d0<<40) | (d1<<32) | (d2<<24) | (d3<<16) | (d4<<8) | d5;
1414 #ifndef USE_WINSOCK
1415 w = sldns_str_print(s, sl, "%llu", (long long)tsigtime);
1416 #else
1417 w = sldns_str_print(s, sl, "%I64u", (long long)tsigtime);
1418 #endif
1419 (*d)+=6;
1420 (*dl)-=6;
1421 return w;
1422 }
1423
sldns_wire2str_a_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1424 int sldns_wire2str_a_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1425 {
1426 char buf[32];
1427 int w;
1428 if(*dl < 4) return -1;
1429 if(!inet_ntop(AF_INET, *d, buf, (socklen_t)sizeof(buf)))
1430 return -1;
1431 w = sldns_str_print(s, sl, "%s", buf);
1432 (*d)+=4;
1433 (*dl)-=4;
1434 return w;
1435 }
1436
sldns_wire2str_aaaa_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1437 int sldns_wire2str_aaaa_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1438 {
1439 #ifdef AF_INET6
1440 char buf[64];
1441 int w;
1442 if(*dl < 16) return -1;
1443 if(!inet_ntop(AF_INET6, *d, buf, (socklen_t)sizeof(buf)))
1444 return -1;
1445 w = sldns_str_print(s, sl, "%s", buf);
1446 (*d)+=16;
1447 (*dl)-=16;
1448 return w;
1449 #else
1450 return -1;
1451 #endif
1452 }
1453
1454 /** printout escaped TYPE_STR character */
str_char_print(char ** s,size_t * sl,uint8_t c)1455 static int str_char_print(char** s, size_t* sl, uint8_t c)
1456 {
1457 if(isprint((unsigned char)c) || c == '\t') {
1458 if(c == '\"' || c == '\\')
1459 return sldns_str_print(s, sl, "\\%c", c);
1460 if(*sl) {
1461 **s = (char)c;
1462 (*s)++;
1463 (*sl)--;
1464 }
1465 return 1;
1466 }
1467 return sldns_str_print(s, sl, "\\%03u", (unsigned)c);
1468 }
1469
sldns_wire2str_str_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1470 int sldns_wire2str_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1471 {
1472 int w = 0;
1473 size_t i, len;
1474 if(*dl < 1) return -1;
1475 len = **d;
1476 if(*dl < 1+len) return -1;
1477 (*d)++;
1478 (*dl)--;
1479 w += sldns_str_print(s, sl, "\"");
1480 for(i=0; i<len; i++)
1481 w += str_char_print(s, sl, (*d)[i]);
1482 w += sldns_str_print(s, sl, "\"");
1483 (*d)+=len;
1484 (*dl)-=len;
1485 return w;
1486 }
1487
sldns_wire2str_apl_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1488 int sldns_wire2str_apl_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1489 {
1490 int i, w = 0;
1491 uint16_t family;
1492 uint8_t negation, prefix, adflength;
1493 if(*dl < 4) return -1;
1494 family = sldns_read_uint16(*d);
1495 prefix = (*d)[2];
1496 negation = ((*d)[3] & LDNS_APL_NEGATION);
1497 adflength = ((*d)[3] & LDNS_APL_MASK);
1498 if(*dl < 4+(size_t)adflength) return -1;
1499 if(family != LDNS_APL_IP4 && family != LDNS_APL_IP6)
1500 return -1; /* unknown address family */
1501 if(negation)
1502 w += sldns_str_print(s, sl, "!");
1503 w += sldns_str_print(s, sl, "%u:", (unsigned)family);
1504 if(family == LDNS_APL_IP4) {
1505 /* check if prefix <32 ? */
1506 /* address is variable length 0 - 4 */
1507 for(i=0; i<4; i++) {
1508 if(i > 0)
1509 w += sldns_str_print(s, sl, ".");
1510 if(i < (int)adflength)
1511 w += sldns_str_print(s, sl, "%d", (*d)[4+i]);
1512 else w += sldns_str_print(s, sl, "0");
1513 }
1514 } else if(family == LDNS_APL_IP6) {
1515 /* check if prefix <128 ? */
1516 /* address is variable length 0 - 16 */
1517 for(i=0; i<16; i++) {
1518 if(i%2 == 0 && i>0)
1519 w += sldns_str_print(s, sl, ":");
1520 if(i < (int)adflength)
1521 w += sldns_str_print(s, sl, "%02x", (*d)[4+i]);
1522 else w += sldns_str_print(s, sl, "00");
1523 }
1524 }
1525 w += sldns_str_print(s, sl, "/%u", (unsigned)prefix);
1526 (*d) += 4+adflength;
1527 (*dl) -= 4+adflength;
1528 return w;
1529 }
1530
sldns_wire2str_b32_ext_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1531 int sldns_wire2str_b32_ext_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1532 {
1533 size_t datalen;
1534 size_t sz;
1535 if(*dl < 1) return -1;
1536 datalen = (*d)[0];
1537 if(*dl < 1+datalen) return -1;
1538 sz = sldns_b32_ntop_calculate_size(datalen);
1539 if(*sl < sz+1) {
1540 (*d) += datalen+1;
1541 (*dl) -= (datalen+1);
1542 return (int)sz; /* out of space really, but would need buffer
1543 in order to truncate the output */
1544 }
1545 sldns_b32_ntop_extended_hex((*d)+1, datalen, *s, *sl);
1546 (*d) += datalen+1;
1547 (*dl) -= (datalen+1);
1548 (*s) += sz;
1549 (*sl) -= sz;
1550 return (int)sz;
1551 }
1552
1553 /** scan number of bytes from wire into b64 presentation format */
sldns_wire2str_b64_scan_num(uint8_t ** d,size_t * dl,char ** s,size_t * sl,size_t num)1554 static int sldns_wire2str_b64_scan_num(uint8_t** d, size_t* dl, char** s,
1555 size_t* sl, size_t num)
1556 {
1557 /* b64_ntop_calculate size includes null at the end */
1558 size_t sz = sldns_b64_ntop_calculate_size(num)-1;
1559 if(*sl < sz+1) {
1560 (*d) += num;
1561 (*dl) -= num;
1562 return (int)sz; /* out of space really, but would need buffer
1563 in order to truncate the output */
1564 }
1565 sldns_b64_ntop(*d, num, *s, *sl);
1566 (*d) += num;
1567 (*dl) -= num;
1568 (*s) += sz;
1569 (*sl) -= sz;
1570 return (int)sz;
1571 }
1572
sldns_wire2str_b64_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1573 int sldns_wire2str_b64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1574 {
1575 if(*dl == 0) {
1576 return sldns_str_print(s, sl, "0");
1577 }
1578 return sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1579 }
1580
sldns_wire2str_hex_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1581 int sldns_wire2str_hex_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1582 {
1583 if(*dl == 0) {
1584 return sldns_str_print(s, sl, "0");
1585 }
1586 return print_remainder_hex("", d, dl, s, sl);
1587 }
1588
sldns_wire2str_nsec_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1589 int sldns_wire2str_nsec_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1590 {
1591 uint8_t* p = *d;
1592 size_t pl = *dl;
1593 unsigned i, bit, window, block_len;
1594 uint16_t t;
1595 int w = 0;
1596
1597 /* check for errors */
1598 while(pl) {
1599 if(pl < 2) return -1;
1600 block_len = (unsigned)p[1];
1601 if(pl < 2+block_len) return -1;
1602 p += block_len+2;
1603 pl -= block_len+2;
1604 }
1605
1606 /* do it */
1607 p = *d;
1608 pl = *dl;
1609 while(pl) {
1610 if(pl < 2) return -1; /* cannot happen */
1611 window = (unsigned)p[0];
1612 block_len = (unsigned)p[1];
1613 if(pl < 2+block_len) return -1; /* cannot happen */
1614 p += 2;
1615 for(i=0; i<block_len; i++) {
1616 if(p[i] == 0) continue;
1617 /* base type number for this octet */
1618 t = ((window)<<8) | (i << 3);
1619 for(bit=0; bit<8; bit++) {
1620 if((p[i]&(0x80>>bit))) {
1621 if(w) w += sldns_str_print(s, sl, " ");
1622 w += sldns_wire2str_type_print(s, sl,
1623 t+bit);
1624 }
1625 }
1626 }
1627 p += block_len;
1628 pl -= block_len+2;
1629 }
1630 (*d) += *dl;
1631 (*dl) = 0;
1632 return w;
1633 }
1634
sldns_wire2str_nsec3_salt_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1635 int sldns_wire2str_nsec3_salt_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1636 {
1637 size_t salt_len;
1638 int w;
1639 if(*dl < 1) return -1;
1640 salt_len = (size_t)(*d)[0];
1641 if(*dl < 1+salt_len) return -1;
1642 (*d)++;
1643 (*dl)--;
1644 if(salt_len == 0) {
1645 return sldns_str_print(s, sl, "-");
1646 }
1647 w = print_hex_buf(s, sl, *d, salt_len);
1648 (*dl)-=salt_len;
1649 (*d)+=salt_len;
1650 return w;
1651 }
1652
sldns_wire2str_cert_alg_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1653 int sldns_wire2str_cert_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1654 {
1655 sldns_lookup_table *lt;
1656 int data, w;
1657 if(*dl < 2) return -1;
1658 data = (int)sldns_read_uint16(*d);
1659 lt = sldns_lookup_by_id(sldns_cert_algorithms, data);
1660 if(lt && lt->name)
1661 w = sldns_str_print(s, sl, "%s", lt->name);
1662 else w = sldns_str_print(s, sl, "%d", data);
1663 (*dl)-=2;
1664 (*d)+=2;
1665 return w;
1666 }
1667
sldns_wire2str_alg_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1668 int sldns_wire2str_alg_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1669 {
1670 /* don't use algorithm mnemonics in the presentation format
1671 * this kind of got sneaked into the rfc's */
1672 return sldns_wire2str_int8_scan(d, dl, s, sl);
1673 }
1674
sldns_wire2str_unknown_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1675 int sldns_wire2str_unknown_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1676 {
1677 return sldns_wire2str_rdata_unknown_scan(d, dl, s, sl);
1678 }
1679
sldns_wire2str_time_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1680 int sldns_wire2str_time_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1681 {
1682 /* create a YYYYMMDDHHMMSS string if possible */
1683 struct tm tm;
1684 char date_buf[16];
1685 uint32_t t;
1686 memset(&tm, 0, sizeof(tm));
1687 if(*dl < 4) return -1;
1688 t = sldns_read_uint32(*d);
1689 date_buf[15]=0;
1690 if(sldns_serial_arithmetics_gmtime_r(t, time(NULL), &tm) &&
1691 strftime(date_buf, 15, "%Y%m%d%H%M%S", &tm)) {
1692 (*d) += 4;
1693 (*dl) -= 4;
1694 return sldns_str_print(s, sl, "%s", date_buf);
1695 }
1696 return -1;
1697 }
1698
1699 static int
loc_cm_print(char ** str,size_t * sl,uint8_t mantissa,uint8_t exponent)1700 loc_cm_print(char** str, size_t* sl, uint8_t mantissa, uint8_t exponent)
1701 {
1702 int w = 0;
1703 uint8_t i;
1704 /* is it 0.<two digits> ? */
1705 if(exponent < 2) {
1706 if(exponent == 1)
1707 mantissa *= 10;
1708 return sldns_str_print(str, sl, "0.%02ld", (long)mantissa);
1709 }
1710 /* always <digit><string of zeros> */
1711 w += sldns_str_print(str, sl, "%d", (int)mantissa);
1712 for(i=0; i<exponent-2; i++)
1713 w += sldns_str_print(str, sl, "0");
1714 return w;
1715 }
1716
sldns_wire2str_loc_scan(uint8_t ** d,size_t * dl,char ** str,size_t * sl)1717 int sldns_wire2str_loc_scan(uint8_t** d, size_t* dl, char** str, size_t* sl)
1718 {
1719 /* we could do checking (ie degrees < 90 etc)? */
1720 uint8_t version;
1721 uint8_t size;
1722 uint8_t horizontal_precision;
1723 uint8_t vertical_precision;
1724 uint32_t longitude;
1725 uint32_t latitude;
1726 uint32_t altitude;
1727 char northerness;
1728 char easterness;
1729 uint32_t h;
1730 uint32_t m;
1731 double s;
1732 uint32_t equator = (uint32_t)1 << 31; /* 2**31 */
1733 int w = 0;
1734
1735 if(*dl < 16) return -1;
1736 version = (*d)[0];
1737 if(version != 0)
1738 return sldns_wire2str_hex_scan(d, dl, str, sl);
1739 size = (*d)[1];
1740 horizontal_precision = (*d)[2];
1741 vertical_precision = (*d)[3];
1742
1743 latitude = sldns_read_uint32((*d)+4);
1744 longitude = sldns_read_uint32((*d)+8);
1745 altitude = sldns_read_uint32((*d)+12);
1746
1747 if (latitude > equator) {
1748 northerness = 'N';
1749 latitude = latitude - equator;
1750 } else {
1751 northerness = 'S';
1752 latitude = equator - latitude;
1753 }
1754 h = latitude / (1000 * 60 * 60);
1755 latitude = latitude % (1000 * 60 * 60);
1756 m = latitude / (1000 * 60);
1757 latitude = latitude % (1000 * 60);
1758 s = (double) latitude / 1000.0;
1759 w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1760 h, m, s, northerness);
1761
1762 if (longitude > equator) {
1763 easterness = 'E';
1764 longitude = longitude - equator;
1765 } else {
1766 easterness = 'W';
1767 longitude = equator - longitude;
1768 }
1769 h = longitude / (1000 * 60 * 60);
1770 longitude = longitude % (1000 * 60 * 60);
1771 m = longitude / (1000 * 60);
1772 longitude = longitude % (1000 * 60);
1773 s = (double) longitude / (1000.0);
1774 w += sldns_str_print(str, sl, "%02u %02u %06.3f %c ",
1775 h, m, s, easterness);
1776
1777 s = ((double) altitude) / 100;
1778 s -= 100000;
1779
1780 if(altitude%100 != 0)
1781 w += sldns_str_print(str, sl, "%.2f", s);
1782 else
1783 w += sldns_str_print(str, sl, "%.0f", s);
1784
1785 w += sldns_str_print(str, sl, "m ");
1786
1787 w += loc_cm_print(str, sl, (size & 0xf0) >> 4, size & 0x0f);
1788 w += sldns_str_print(str, sl, "m ");
1789
1790 w += loc_cm_print(str, sl, (horizontal_precision & 0xf0) >> 4,
1791 horizontal_precision & 0x0f);
1792 w += sldns_str_print(str, sl, "m ");
1793
1794 w += loc_cm_print(str, sl, (vertical_precision & 0xf0) >> 4,
1795 vertical_precision & 0x0f);
1796 w += sldns_str_print(str, sl, "m");
1797
1798 (*d)+=16;
1799 (*dl)-=16;
1800 return w;
1801 }
1802
sldns_wire2str_wks_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1803 int sldns_wire2str_wks_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1804 {
1805 /* protocol, followed by bitmap of services */
1806 const char* proto_name = NULL;
1807 struct protoent *protocol;
1808 struct servent *service;
1809 uint8_t protocol_nr;
1810 int bit, port, w = 0;
1811 size_t i;
1812 /* we cannot print with strings because they
1813 * are not portable, the presentation format may
1814 * not be able to be read in on another computer. */
1815 int print_symbols = 0;
1816
1817 /* protocol */
1818 if(*dl < 1) return -1;
1819 protocol_nr = (*d)[0];
1820 (*d)++;
1821 (*dl)--;
1822 protocol = getprotobynumber((int)protocol_nr);
1823 if(protocol && (protocol->p_name != NULL)) {
1824 w += sldns_str_print(s, sl, "%s", protocol->p_name);
1825 proto_name = protocol->p_name;
1826 } else if(protocol_nr == 6) {
1827 w += sldns_str_print(s, sl, "tcp");
1828 } else if(protocol_nr == 17) {
1829 w += sldns_str_print(s, sl, "udp");
1830 } else {
1831 w += sldns_str_print(s, sl, "%u", (unsigned)protocol_nr);
1832 }
1833
1834 for(i=0; i<*dl; i++) {
1835 if((*d)[i] == 0)
1836 continue;
1837 for(bit=0; bit<8; bit++) {
1838 if(!(((*d)[i])&(0x80>>bit)))
1839 continue;
1840 port = (int)i*8 + bit;
1841
1842 if(!print_symbols)
1843 service = NULL;
1844 else
1845 service = getservbyport(
1846 (int)htons((uint16_t)port), proto_name);
1847 if(service && service->s_name)
1848 w += sldns_str_print(s, sl, " %s",
1849 service->s_name);
1850 else w += sldns_str_print(s, sl, " %u",
1851 (unsigned)port);
1852 }
1853 }
1854
1855 #ifdef HAVE_ENDSERVENT
1856 endservent();
1857 #endif
1858 #ifdef HAVE_ENDPROTOENT
1859 endprotoent();
1860 #endif
1861 (*d) += *dl;
1862 (*dl) = 0;
1863 return w;
1864 }
1865
sldns_wire2str_nsap_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1866 int sldns_wire2str_nsap_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1867 {
1868 return print_remainder_hex("0x", d, dl, s, sl);
1869 }
1870
sldns_wire2str_atma_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1871 int sldns_wire2str_atma_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1872 {
1873 return print_remainder_hex("", d, dl, s, sl);
1874 }
1875
1876 /* internal scan routine that can modify arguments on failure */
sldns_wire2str_ipseckey_scan_internal(uint8_t ** d,size_t * dl,char ** s,size_t * sl,uint8_t * pkt,size_t pktlen,int * comprloop)1877 static int sldns_wire2str_ipseckey_scan_internal(uint8_t** d, size_t* dl,
1878 char** s, size_t* sl, uint8_t* pkt, size_t pktlen, int* comprloop)
1879 {
1880 /* http://www.ietf.org/internet-drafts/draft-ietf-ipseckey-rr-12.txt*/
1881 uint8_t precedence, gateway_type, algorithm;
1882 int w = 0;
1883
1884 if(*dl < 3) return -1;
1885 precedence = (*d)[0];
1886 gateway_type = (*d)[1];
1887 algorithm = (*d)[2];
1888 if(gateway_type > 3)
1889 return -1; /* unknown */
1890 (*d)+=3;
1891 (*dl)-=3;
1892 w += sldns_str_print(s, sl, "%d %d %d ",
1893 (int)precedence, (int)gateway_type, (int)algorithm);
1894
1895 switch(gateway_type) {
1896 case 0: /* no gateway */
1897 w += sldns_str_print(s, sl, ".");
1898 break;
1899 case 1: /* ip4 */
1900 w += sldns_wire2str_a_scan(d, dl, s, sl);
1901 break;
1902 case 2: /* ip6 */
1903 w += sldns_wire2str_aaaa_scan(d, dl, s, sl);
1904 break;
1905 case 3: /* dname */
1906 w += sldns_wire2str_dname_scan(d, dl, s, sl, pkt, pktlen, comprloop);
1907 break;
1908 default: /* unknown */
1909 return -1;
1910 }
1911
1912 if(*dl < 1)
1913 return -1;
1914 w += sldns_str_print(s, sl, " ");
1915 w += sldns_wire2str_b64_scan_num(d, dl, s, sl, *dl);
1916 return w;
1917 }
1918
sldns_wire2str_ipseckey_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl,uint8_t * pkt,size_t pktlen,int * comprloop)1919 int sldns_wire2str_ipseckey_scan(uint8_t** d, size_t* dl, char** s, size_t* sl,
1920 uint8_t* pkt, size_t pktlen, int* comprloop)
1921 {
1922 uint8_t* od = *d;
1923 char* os = *s;
1924 size_t odl = *dl, osl = *sl;
1925 int w=sldns_wire2str_ipseckey_scan_internal(d, dl, s, sl, pkt, pktlen, comprloop);
1926 if(w == -1) {
1927 *d = od;
1928 *s = os;
1929 *dl = odl;
1930 *sl = osl;
1931 return -1;
1932 }
1933 return w;
1934 }
1935
sldns_wire2str_hip_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1936 int sldns_wire2str_hip_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1937 {
1938 int w;
1939 uint8_t algo, hitlen;
1940 uint16_t pklen;
1941
1942 /* read lengths */
1943 if(*dl < 4)
1944 return -1;
1945 hitlen = (*d)[0];
1946 algo = (*d)[1];
1947 pklen = sldns_read_uint16((*d)+2);
1948 if(*dl < (size_t)4 + (size_t)hitlen + (size_t)pklen)
1949 return -1;
1950
1951 /* write: algo hit pubkey */
1952 w = sldns_str_print(s, sl, "%u ", (unsigned)algo);
1953 w += print_hex_buf(s, sl, (*d)+4, hitlen);
1954 w += sldns_str_print(s, sl, " ");
1955 (*d)+=4+hitlen;
1956 (*dl)-= (4+hitlen);
1957 w += sldns_wire2str_b64_scan_num(d, dl, s, sl, pklen);
1958 return w;
1959 }
1960
sldns_wire2str_int16_data_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1961 int sldns_wire2str_int16_data_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1962 {
1963 int w;
1964 uint16_t n;
1965 if(*dl < 2)
1966 return -1;
1967 n = sldns_read_uint16(*d);
1968 if(*dl < 2+(size_t)n)
1969 return -1;
1970 (*d)+=2;
1971 (*dl)-=2;
1972 if(n == 0) {
1973 return sldns_str_print(s, sl, "0");
1974 }
1975 w = sldns_str_print(s, sl, "%u ", (unsigned)n);
1976 w += sldns_wire2str_b64_scan_num(d, dl, s, sl, n);
1977 return w;
1978 }
1979
sldns_wire2str_nsec3_next_owner_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1980 int sldns_wire2str_nsec3_next_owner_scan(uint8_t** d, size_t* dl, char** s,
1981 size_t* sl)
1982 {
1983 return sldns_wire2str_b32_ext_scan(d, dl, s, sl);
1984 }
1985
sldns_wire2str_ilnp64_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1986 int sldns_wire2str_ilnp64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
1987 {
1988 int w;
1989 if(*dl < 8)
1990 return -1;
1991 w = sldns_str_print(s, sl, "%.4x:%.4x:%.4x:%.4x",
1992 sldns_read_uint16(*d), sldns_read_uint16((*d)+2),
1993 sldns_read_uint16((*d)+4), sldns_read_uint16((*d)+6));
1994 (*d)+=8;
1995 (*dl)-=8;
1996 return w;
1997 }
1998
sldns_wire2str_eui48_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)1999 int sldns_wire2str_eui48_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
2000 {
2001 int w;
2002 if(*dl < 6)
2003 return -1;
2004 w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
2005 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5]);
2006 (*d)+=6;
2007 (*dl)-=6;
2008 return w;
2009 }
2010
sldns_wire2str_eui64_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)2011 int sldns_wire2str_eui64_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
2012 {
2013 int w;
2014 if(*dl < 8)
2015 return -1;
2016 w = sldns_str_print(s, sl, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
2017 (*d)[0], (*d)[1], (*d)[2], (*d)[3], (*d)[4], (*d)[5],
2018 (*d)[6], (*d)[7]);
2019 (*d)+=8;
2020 (*dl)-=8;
2021 return w;
2022 }
2023
sldns_wire2str_tag_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)2024 int sldns_wire2str_tag_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
2025 {
2026 size_t i, n;
2027 int w = 0;
2028 if(*dl < 1)
2029 return -1;
2030 n = (size_t)((*d)[0]);
2031 if(*dl < 1+n)
2032 return -1;
2033 for(i=0; i<n; i++)
2034 if(!isalnum((unsigned char)(*d)[i+1]))
2035 return -1;
2036 for(i=0; i<n; i++)
2037 w += sldns_str_print(s, sl, "%c", (char)(*d)[i+1]);
2038 (*d)+=n+1;
2039 (*dl)-=(n+1);
2040 return w;
2041 }
2042
sldns_wire2str_long_str_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)2043 int sldns_wire2str_long_str_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
2044 {
2045 size_t i;
2046 int w = 0;
2047 w += sldns_str_print(s, sl, "\"");
2048 for(i=0; i<*dl; i++)
2049 w += str_char_print(s, sl, (*d)[i]);
2050 w += sldns_str_print(s, sl, "\"");
2051 (*d)+=*dl;
2052 (*dl)=0;
2053 return w;
2054 }
2055
sldns_wire2str_tsigerror_scan(uint8_t ** d,size_t * dl,char ** s,size_t * sl)2056 int sldns_wire2str_tsigerror_scan(uint8_t** d, size_t* dl, char** s, size_t* sl)
2057 {
2058 sldns_lookup_table *lt;
2059 int data, w;
2060 if(*dl < 2) return -1;
2061 data = (int)sldns_read_uint16(*d);
2062 lt = sldns_lookup_by_id(sldns_tsig_errors, data);
2063 if(lt && lt->name)
2064 w = sldns_str_print(s, sl, "%s", lt->name);
2065 else w = sldns_str_print(s, sl, "%d", data);
2066 (*dl)-=2;
2067 (*d)+=2;
2068 return w;
2069 }
2070
sldns_wire2str_edns_llq_print(char ** s,size_t * sl,uint8_t * data,size_t len)2071 int sldns_wire2str_edns_llq_print(char** s, size_t* sl, uint8_t* data,
2072 size_t len)
2073 {
2074 /* LLQ constants */
2075 const char* llq_errors[] = {"NO-ERROR", "SERV-FULL", "STATIC",
2076 "FORMAT-ERR", "NO-SUCH-LLQ", "BAD-VERS", "UNKNOWN_ERR"};
2077 const unsigned int llq_errors_num = 7;
2078 const char* llq_opcodes[] = {"LLQ-SETUP", "LLQ-REFRESH", "LLQ-EVENT"};
2079 const unsigned int llq_opcodes_num = 3;
2080 uint16_t version, llq_opcode, error_code;
2081 uint64_t llq_id;
2082 uint32_t lease_life; /* Requested or granted life of LLQ, in seconds */
2083 int w = 0;
2084
2085 /* read the record */
2086 if(len != 18) {
2087 w += sldns_str_print(s, sl, "malformed LLQ ");
2088 w += print_hex_buf(s, sl, data, len);
2089 return w;
2090 }
2091 version = sldns_read_uint16(data);
2092 llq_opcode = sldns_read_uint16(data+2);
2093 error_code = sldns_read_uint16(data+4);
2094 memmove(&llq_id, data+6, sizeof(llq_id));
2095 lease_life = sldns_read_uint32(data+14);
2096
2097 /* print it */
2098 w += sldns_str_print(s, sl, "v%d ", (int)version);
2099 if(llq_opcode < llq_opcodes_num)
2100 w += sldns_str_print(s, sl, "%s", llq_opcodes[llq_opcode]);
2101 else w += sldns_str_print(s, sl, "opcode %d", (int)llq_opcode);
2102 if(error_code < llq_errors_num)
2103 w += sldns_str_print(s, sl, " %s", llq_errors[error_code]);
2104 else w += sldns_str_print(s, sl, " error %d", (int)error_code);
2105 #ifndef USE_WINSOCK
2106 w += sldns_str_print(s, sl, " id %llx lease-life %lu",
2107 (unsigned long long)llq_id, (unsigned long)lease_life);
2108 #else
2109 w += sldns_str_print(s, sl, " id %I64x lease-life %lu",
2110 (unsigned long long)llq_id, (unsigned long)lease_life);
2111 #endif
2112 return w;
2113 }
2114
sldns_wire2str_edns_ul_print(char ** s,size_t * sl,uint8_t * data,size_t len)2115 int sldns_wire2str_edns_ul_print(char** s, size_t* sl, uint8_t* data,
2116 size_t len)
2117 {
2118 uint32_t lease;
2119 int w = 0;
2120 if(len != 4) {
2121 w += sldns_str_print(s, sl, "malformed UL ");
2122 w += print_hex_buf(s, sl, data, len);
2123 return w;
2124 }
2125 lease = sldns_read_uint32(data);
2126 w += sldns_str_print(s, sl, "lease %lu", (unsigned long)lease);
2127 return w;
2128 }
2129
sldns_wire2str_edns_nsid_print(char ** s,size_t * sl,uint8_t * data,size_t len)2130 int sldns_wire2str_edns_nsid_print(char** s, size_t* sl, uint8_t* data,
2131 size_t len)
2132 {
2133 int w = 0;
2134 size_t i, printed=0;
2135 w += print_hex_buf(s, sl, data, len);
2136 for(i=0; i<len; i++) {
2137 if(isprint((unsigned char)data[i]) || data[i] == '\t') {
2138 if(!printed) {
2139 w += sldns_str_print(s, sl, " (");
2140 printed = 1;
2141 }
2142 w += sldns_str_print(s, sl, "%c", (char)data[i]);
2143 }
2144 }
2145 if(printed)
2146 w += sldns_str_print(s, sl, ")");
2147 return w;
2148 }
2149
sldns_wire2str_edns_dau_print(char ** s,size_t * sl,uint8_t * data,size_t len)2150 int sldns_wire2str_edns_dau_print(char** s, size_t* sl, uint8_t* data,
2151 size_t len)
2152 {
2153 sldns_lookup_table *lt;
2154 size_t i;
2155 int w = 0;
2156 for(i=0; i<len; i++) {
2157 lt = sldns_lookup_by_id(sldns_algorithms, (int)data[i]);
2158 if(lt && lt->name)
2159 w += sldns_str_print(s, sl, " %s", lt->name);
2160 else w += sldns_str_print(s, sl, " %d", (int)data[i]);
2161 }
2162 return w;
2163 }
2164
sldns_wire2str_edns_dhu_print(char ** s,size_t * sl,uint8_t * data,size_t len)2165 int sldns_wire2str_edns_dhu_print(char** s, size_t* sl, uint8_t* data,
2166 size_t len)
2167 {
2168 sldns_lookup_table *lt;
2169 size_t i;
2170 int w = 0;
2171 for(i=0; i<len; i++) {
2172 lt = sldns_lookup_by_id(sldns_hashes, (int)data[i]);
2173 if(lt && lt->name)
2174 w += sldns_str_print(s, sl, " %s", lt->name);
2175 else w += sldns_str_print(s, sl, " %d", (int)data[i]);
2176 }
2177 return w;
2178 }
2179
sldns_wire2str_edns_n3u_print(char ** s,size_t * sl,uint8_t * data,size_t len)2180 int sldns_wire2str_edns_n3u_print(char** s, size_t* sl, uint8_t* data,
2181 size_t len)
2182 {
2183 size_t i;
2184 int w = 0;
2185 for(i=0; i<len; i++) {
2186 if(data[i] == 1)
2187 w += sldns_str_print(s, sl, " SHA1");
2188 else w += sldns_str_print(s, sl, " %d", (int)data[i]);
2189 }
2190 return w;
2191 }
2192
sldns_wire2str_edns_subnet_print(char ** s,size_t * sl,uint8_t * data,size_t len)2193 int sldns_wire2str_edns_subnet_print(char** s, size_t* sl, uint8_t* data,
2194 size_t len)
2195 {
2196 int w = 0;
2197 uint16_t family;
2198 uint8_t source, scope;
2199 if(len < 4) {
2200 w += sldns_str_print(s, sl, "malformed subnet ");
2201 w += print_hex_buf(s, sl, data, len);
2202 return w;
2203 }
2204 family = sldns_read_uint16(data);
2205 source = data[2];
2206 scope = data[3];
2207 if(family == 1) {
2208 /* IP4 */
2209 char buf[64];
2210 uint8_t ip4[4];
2211 memset(ip4, 0, sizeof(ip4));
2212 if(len-4 > 4) {
2213 w += sldns_str_print(s, sl, "trailingdata:");
2214 w += print_hex_buf(s, sl, data+4+4, len-4-4);
2215 w += sldns_str_print(s, sl, " ");
2216 len = 4+4;
2217 }
2218 memmove(ip4, data+4, len-4);
2219 if(!inet_ntop(AF_INET, ip4, buf, (socklen_t)sizeof(buf))) {
2220 w += sldns_str_print(s, sl, "ip4ntoperror ");
2221 w += print_hex_buf(s, sl, data+4+4, len-4-4);
2222 } else {
2223 w += sldns_str_print(s, sl, "%s", buf);
2224 }
2225 } else if(family == 2) {
2226 /* IP6 */
2227 char buf[64];
2228 uint8_t ip6[16];
2229 memset(ip6, 0, sizeof(ip6));
2230 if(len-4 > 16) {
2231 w += sldns_str_print(s, sl, "trailingdata:");
2232 w += print_hex_buf(s, sl, data+4+16, len-4-16);
2233 w += sldns_str_print(s, sl, " ");
2234 len = 4+16;
2235 }
2236 memmove(ip6, data+4, len-4);
2237 #ifdef AF_INET6
2238 if(!inet_ntop(AF_INET6, ip6, buf, (socklen_t)sizeof(buf))) {
2239 w += sldns_str_print(s, sl, "ip6ntoperror ");
2240 w += print_hex_buf(s, sl, data+4+4, len-4-4);
2241 } else {
2242 w += sldns_str_print(s, sl, "%s", buf);
2243 }
2244 #else
2245 w += print_hex_buf(s, sl, data+4+4, len-4-4);
2246 #endif
2247 } else {
2248 /* unknown */
2249 w += sldns_str_print(s, sl, "family %d ",
2250 (int)family);
2251 w += print_hex_buf(s, sl, data, len);
2252 }
2253 w += sldns_str_print(s, sl, "/%d scope /%d", (int)source, (int)scope);
2254 return w;
2255 }
2256
sldns_wire2str_edns_keepalive_print(char ** s,size_t * sl,uint8_t * data,size_t len)2257 static int sldns_wire2str_edns_keepalive_print(char** s, size_t* sl,
2258 uint8_t* data, size_t len)
2259 {
2260 int w = 0;
2261 uint16_t timeout;
2262 if(!(len == 0 || len == 2)) {
2263 w += sldns_str_print(s, sl, "malformed keepalive ");
2264 w += print_hex_buf(s, sl, data, len);
2265 return w;
2266 }
2267 if(len == 0 ) {
2268 w += sldns_str_print(s, sl, "no timeout value (only valid for client option) ");
2269 } else {
2270 timeout = sldns_read_uint16(data);
2271 w += sldns_str_print(s, sl, "timeout value in units of 100ms %u", (int)timeout);
2272 }
2273 return w;
2274 }
2275
sldns_wire2str_edns_ede_print(char ** s,size_t * sl,uint8_t * data,size_t len)2276 int sldns_wire2str_edns_ede_print(char** s, size_t* sl,
2277 uint8_t* data, size_t len)
2278 {
2279 uint16_t ede_code;
2280 int w = 0;
2281 sldns_lookup_table *lt;
2282 size_t i;
2283 int printable;
2284
2285 if(len < 2) {
2286 w += sldns_str_print(s, sl, "malformed ede ");
2287 w += print_hex_buf(s, sl, data, len);
2288 return w;
2289 }
2290
2291 ede_code = sldns_read_uint16(data);
2292 lt = sldns_lookup_by_id(sldns_edns_ede_codes, (int)ede_code);
2293 if(lt && lt->name)
2294 w += sldns_str_print(s, sl, "%s", lt->name);
2295 else w += sldns_str_print(s, sl, "%d", (int)ede_code);
2296
2297 if(len == 2)
2298 return w;
2299
2300 w += sldns_str_print(s, sl, " ");
2301
2302 /* If it looks like text, show it as text. */
2303 printable=1;
2304 for(i=2; i<len; i++) {
2305 if(isprint((unsigned char)data[i]) || data[i] == '\t')
2306 continue;
2307 printable = 0;
2308 break;
2309 }
2310 if(printable) {
2311 w += sldns_str_print(s, sl, "\"");
2312 for(i=2; i<len; i++) {
2313 w += str_char_print(s, sl, data[i]);
2314 }
2315 w += sldns_str_print(s, sl, "\"");
2316 } else {
2317 w += print_hex_buf(s, sl, data+2, len-2);
2318 }
2319 return w;
2320 }
2321
sldns_wire2str_edns_option_print(char ** s,size_t * sl,uint16_t option_code,uint8_t * optdata,size_t optlen)2322 int sldns_wire2str_edns_option_print(char** s, size_t* sl,
2323 uint16_t option_code, uint8_t* optdata, size_t optlen)
2324 {
2325 int w = 0;
2326 w += sldns_wire2str_edns_option_code_print(s, sl, option_code);
2327 w += sldns_str_print(s, sl, ": ");
2328 switch(option_code) {
2329 case LDNS_EDNS_LLQ:
2330 w += sldns_wire2str_edns_llq_print(s, sl, optdata, optlen);
2331 break;
2332 case LDNS_EDNS_UL:
2333 w += sldns_wire2str_edns_ul_print(s, sl, optdata, optlen);
2334 break;
2335 case LDNS_EDNS_NSID:
2336 w += sldns_wire2str_edns_nsid_print(s, sl, optdata, optlen);
2337 break;
2338 case LDNS_EDNS_DAU:
2339 w += sldns_wire2str_edns_dau_print(s, sl, optdata, optlen);
2340 break;
2341 case LDNS_EDNS_DHU:
2342 w += sldns_wire2str_edns_dhu_print(s, sl, optdata, optlen);
2343 break;
2344 case LDNS_EDNS_N3U:
2345 w += sldns_wire2str_edns_n3u_print(s, sl, optdata, optlen);
2346 break;
2347 case LDNS_EDNS_CLIENT_SUBNET:
2348 w += sldns_wire2str_edns_subnet_print(s, sl, optdata, optlen);
2349 break;
2350 case LDNS_EDNS_KEEPALIVE:
2351 w += sldns_wire2str_edns_keepalive_print(s, sl, optdata, optlen);
2352 break;
2353 case LDNS_EDNS_PADDING:
2354 w += print_hex_buf(s, sl, optdata, optlen);
2355 break;
2356 case LDNS_EDNS_EDE:
2357 w += sldns_wire2str_edns_ede_print(s, sl, optdata, optlen);
2358 break;
2359 default:
2360 /* unknown option code */
2361 w += print_hex_buf(s, sl, optdata, optlen);
2362 break;
2363 }
2364 return w;
2365 }
2366
2367 /** print the edns options to string */
2368 static int
print_edns_opts(char ** s,size_t * sl,uint8_t * rdata,size_t rdatalen)2369 print_edns_opts(char** s, size_t* sl, uint8_t* rdata, size_t rdatalen)
2370 {
2371 uint16_t option_code, option_len;
2372 int w = 0;
2373 while(rdatalen > 0) {
2374 /* option name */
2375 if(rdatalen < 4) {
2376 w += sldns_str_print(s, sl, " ; malformed: ");
2377 w += print_hex_buf(s, sl, rdata, rdatalen);
2378 return w;
2379 }
2380 option_code = sldns_read_uint16(rdata);
2381 option_len = sldns_read_uint16(rdata+2);
2382 rdata += 4;
2383 rdatalen -= 4;
2384
2385 /* option value */
2386 if(rdatalen < (size_t)option_len) {
2387 w += sldns_str_print(s, sl, " ; malformed ");
2388 w += sldns_wire2str_edns_option_code_print(s, sl,
2389 option_code);
2390 w += sldns_str_print(s, sl, ": ");
2391 w += print_hex_buf(s, sl, rdata, rdatalen);
2392 return w;
2393 }
2394 w += sldns_str_print(s, sl, " ; ");
2395 w += sldns_wire2str_edns_option_print(s, sl, option_code,
2396 rdata, option_len);
2397 rdata += option_len;
2398 rdatalen -= option_len;
2399 }
2400 return w;
2401 }
2402
sldns_wire2str_edns_scan(uint8_t ** data,size_t * data_len,char ** str,size_t * str_len,uint8_t * pkt,size_t pktlen)2403 int sldns_wire2str_edns_scan(uint8_t** data, size_t* data_len, char** str,
2404 size_t* str_len, uint8_t* pkt, size_t pktlen)
2405 {
2406 int w = 0;
2407 uint8_t ext_rcode, edns_version;
2408 uint16_t udpsize, edns_bits, rdatalen;
2409 w += sldns_str_print(str, str_len, "; EDNS:");
2410
2411 /* some input checks, domain name */
2412 if(*data_len < 1+10)
2413 return w + print_remainder_hex("Error malformed 0x",
2414 data, data_len, str, str_len);
2415 if(*data[0] != 0) {
2416 return w + print_remainder_hex("Error nonrootdname 0x",
2417 data, data_len, str, str_len);
2418 }
2419 (*data)++;
2420 (*data_len)--;
2421
2422 /* check type and read fixed contents */
2423 if(sldns_read_uint16((*data)) != LDNS_RR_TYPE_OPT) {
2424 return w + print_remainder_hex("Error nottypeOPT 0x",
2425 data, data_len, str, str_len);
2426 }
2427 udpsize = sldns_read_uint16((*data)+2);
2428 ext_rcode = (*data)[4];
2429 edns_version = (*data)[5];
2430 edns_bits = sldns_read_uint16((*data)+6);
2431 rdatalen = sldns_read_uint16((*data)+8);
2432 (*data)+=10;
2433 (*data_len)-=10;
2434
2435 w += sldns_str_print(str, str_len, " version: %u;",
2436 (unsigned)edns_version);
2437 w += sldns_str_print(str, str_len, " flags:");
2438 if((edns_bits & LDNS_EDNS_MASK_DO_BIT))
2439 w += sldns_str_print(str, str_len, " do");
2440 /* the extended rcode is the value set, shifted four bits,
2441 * and or'd with the original rcode */
2442 if(ext_rcode) {
2443 int rc = ((int)ext_rcode)<<4;
2444 if(pkt && pktlen >= LDNS_HEADER_SIZE)
2445 rc |= LDNS_RCODE_WIRE(pkt);
2446 w += sldns_str_print(str, str_len, " ; ext-rcode: %d", rc);
2447 }
2448 w += sldns_str_print(str, str_len, " ; udp: %u", (unsigned)udpsize);
2449
2450 if(rdatalen) {
2451 if((size_t)*data_len < rdatalen) {
2452 w += sldns_str_print(str, str_len,
2453 " ; Error EDNS rdata too short; ");
2454 rdatalen = (uint16_t)*data_len;
2455 }
2456 w += print_edns_opts(str, str_len, *data, rdatalen);
2457 (*data) += rdatalen;
2458 (*data_len) -= rdatalen;
2459 }
2460 w += sldns_str_print(str, str_len, "\n");
2461 return w;
2462 }
2463