e576be50 |
1 | /* |
2 | * general.c |
3 | * - diagnostic functions |
4 | * - vbuf handling |
5 | */ |
6 | /* |
a719a4be |
7 | * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson |
e576be50 |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2, or (at your option) |
12 | * any later version. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software Foundation, |
21 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
22 | */ |
23 | |
3955725c |
24 | #include <stdlib.h> |
25 | |
0f091044 |
26 | #include <sys/types.h> |
eec1d9c8 |
27 | #include <sys/socket.h> |
28 | #include <netinet/in.h> |
3955725c |
29 | #include <arpa/inet.h> |
30 | |
e576be50 |
31 | #include "internal.h" |
32 | |
33 | /* Core diagnostic functions */ |
34 | |
35 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
3955725c |
36 | int serv, adns_query qu, const char *fmt, va_list al) { |
e576be50 |
37 | const char *bef, *aft; |
38 | vbuf vb; |
36369543 |
39 | |
40 | if (!ads->diagfile || |
41 | (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent)))) |
42 | return; |
e576be50 |
43 | |
36369543 |
44 | fprintf(ads->diagfile,"adns%s: ",pfx); |
e576be50 |
45 | |
36369543 |
46 | vfprintf(ads->diagfile,fmt,al); |
e576be50 |
47 | |
48 | bef= " ("; |
49 | aft= "\n"; |
50 | |
51 | if (qu && qu->query_dgram) { |
52 | adns__vbuf_init(&vb); |
36369543 |
53 | fprintf(ads->diagfile,"%sQNAME=%s, QTYPE=%s", |
e576be50 |
54 | bef, |
828d89bd |
55 | adns__diag_domain(qu->ads,-1,0, &vb, |
3955725c |
56 | qu->query_dgram,qu->query_dglen,DNS_HDRSIZE), |
86e7b8d9 |
57 | qu->typei ? qu->typei->rrtname : "<unknown>"); |
58 | if (qu->typei && qu->typei->fmtname) |
36369543 |
59 | fprintf(ads->diagfile,"(%s)",qu->typei->fmtname); |
e576be50 |
60 | bef=", "; aft=")\n"; |
61 | } |
62 | |
63 | if (serv>=0) { |
36369543 |
64 | fprintf(ads->diagfile,"%sNS=%s",bef,inet_ntoa(ads->servers[serv].addr)); |
e576be50 |
65 | bef=", "; aft=")\n"; |
66 | } |
67 | |
36369543 |
68 | fputs(aft,ads->diagfile); |
e576be50 |
69 | } |
70 | |
71 | void adns__debug(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
72 | va_list al; |
73 | |
74 | va_start(al,fmt); |
75 | adns__vdiag(ads," debug",0,serv,qu,fmt,al); |
76 | va_end(al); |
77 | } |
78 | |
79 | void adns__warn(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
80 | va_list al; |
81 | |
82 | va_start(al,fmt); |
83 | adns__vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,qu,fmt,al); |
84 | va_end(al); |
85 | } |
86 | |
87 | void adns__diag(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
88 | va_list al; |
89 | |
90 | va_start(al,fmt); |
91 | adns__vdiag(ads,"",adns_if_noerrprint,serv,qu,fmt,al); |
92 | va_end(al); |
93 | } |
94 | |
95 | /* vbuf functions */ |
96 | |
97 | void adns__vbuf_init(vbuf *vb) { |
98 | vb->used= vb->avail= 0; vb->buf= 0; |
99 | } |
100 | |
101 | int adns__vbuf_ensure(vbuf *vb, int want) { |
102 | void *nb; |
103 | |
104 | if (vb->avail >= want) return 1; |
105 | nb= realloc(vb->buf,want); if (!nb) return 0; |
106 | vb->buf= nb; |
107 | vb->avail= want; |
108 | return 1; |
109 | } |
110 | |
111 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
112 | memcpy(vb->buf+vb->used,data,len); |
113 | vb->used+= len; |
114 | } |
115 | |
116 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
117 | int newlen; |
118 | void *nb; |
119 | |
120 | newlen= vb->used+len; |
121 | if (vb->avail < newlen) { |
a49a6d7b |
122 | if (newlen<20) newlen= 20; |
e576be50 |
123 | newlen <<= 1; |
124 | nb= realloc(vb->buf,newlen); |
a49a6d7b |
125 | if (!nb) { newlen= vb->used+len; nb= realloc(vb->buf,newlen); } |
e576be50 |
126 | if (!nb) return 0; |
127 | vb->buf= nb; |
128 | vb->avail= newlen; |
129 | } |
130 | adns__vbuf_appendq(vb,data,len); |
131 | return 1; |
132 | } |
133 | |
f759e52e |
134 | int adns__vbuf_appendstr(vbuf *vb, const char *data) { |
135 | int l; |
9557e604 |
136 | l= strlen(data); |
f759e52e |
137 | return adns__vbuf_append(vb,data,l); |
138 | } |
139 | |
a49a6d7b |
140 | void adns__vbuf_free(vbuf *vb) { |
141 | free(vb->buf); |
142 | adns__vbuf_init(vb); |
143 | } |
144 | |
e576be50 |
145 | /* Additional diagnostic functions */ |
146 | |
828d89bd |
147 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
148 | vbuf *vb, const byte *dgram, int dglen, int cbyte) { |
e576be50 |
149 | adns_status st; |
150 | |
828d89bd |
151 | st= adns__parse_domain(ads,serv,qu,vb, pdf_quoteok, dgram,dglen,&cbyte,dglen); |
ea1e31e3 |
152 | if (st == adns_s_nomemory) { |
e576be50 |
153 | return "<cannot report domain... out of memory>"; |
154 | } |
155 | if (st) { |
156 | vb->used= 0; |
157 | if (!(adns__vbuf_appendstr(vb,"<bad format... ") && |
158 | adns__vbuf_appendstr(vb,adns_strerror(st)) && |
159 | adns__vbuf_appendstr(vb,">") && |
160 | adns__vbuf_append(vb,"",1))) { |
161 | return "<cannot report bad format... out of memory>"; |
162 | } |
163 | } |
3955725c |
164 | if (!vb->used) { |
e576be50 |
165 | adns__vbuf_appendstr(vb,"<truncated ...>"); |
166 | adns__vbuf_append(vb,"",1); |
167 | } |
168 | return vb->buf; |
169 | } |
86e7b8d9 |
170 | |
171 | adns_status adns_rr_info(adns_rrtype type, |
172 | const char **rrtname_r, const char **fmtname_r, |
173 | int *len_r, |
174 | const void *datap, char **data_r) { |
175 | const typeinfo *typei; |
176 | vbuf vb; |
177 | adns_status st; |
178 | |
179 | typei= adns__findtype(type); |
ea1e31e3 |
180 | if (!typei) return adns_s_unknownrrtype; |
86e7b8d9 |
181 | |
182 | if (rrtname_r) *rrtname_r= typei->rrtname; |
183 | if (fmtname_r) *fmtname_r= typei->fmtname; |
184 | if (len_r) *len_r= typei->rrsz; |
185 | |
186 | if (!datap) return adns_s_ok; |
187 | |
188 | adns__vbuf_init(&vb); |
189 | st= typei->convstring(&vb,datap); |
190 | if (st) goto x_freevb; |
ea1e31e3 |
191 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
86e7b8d9 |
192 | assert(strlen(vb.buf) == vb.used-1); |
193 | *data_r= realloc(vb.buf,vb.used); |
194 | if (!*data_r) *data_r= vb.buf; |
195 | return adns_s_ok; |
196 | |
197 | x_freevb: |
198 | adns__vbuf_free(&vb); |
199 | return st; |
200 | } |
201 | |
9da4a044 |
202 | #define SINFO(n,s) { adns_s_##n, #n, s } |
86e7b8d9 |
203 | |
204 | static const struct sinfo { |
205 | adns_status st; |
9da4a044 |
206 | const char *abbrev; |
86e7b8d9 |
207 | const char *string; |
208 | } sinfos[]= { |
ea1e31e3 |
209 | SINFO( ok, "OK" ), |
210 | |
211 | SINFO( nomemory, "Out of memory" ), |
212 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), |
54f4a80a |
213 | SINFO( systemfail, "General resolver or system failure" ), |
ea1e31e3 |
214 | |
215 | SINFO( timeout, "DNS query timed out" ), |
216 | SINFO( allservfail, "All nameservers failed" ), |
217 | SINFO( norecurse, "Recursion denied by nameserver" ), |
218 | SINFO( invalidresponse, "Nameserver sent bad response" ), |
219 | SINFO( unknownformat, "Nameserver used unknown format" ), |
220 | |
221 | SINFO( rcodeservfail, "Nameserver reports failure" ), |
222 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), |
223 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), |
224 | SINFO( rcoderefused, "Query refused by nameserver" ), |
225 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), |
226 | |
227 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), |
228 | SINFO( prohibitedcname, "DNS data refers to an alias" ), |
229 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), |
230 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), |
231 | SINFO( invaliddata, "Found invalid DNS data" ), |
232 | |
233 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), |
234 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), |
235 | SINFO( querydomaintoolong, "Domain name is too long" ), |
236 | |
237 | SINFO( nxdomain, "No such domain" ), |
238 | SINFO( nodata, "No such data" ), |
86e7b8d9 |
239 | }; |
240 | |
241 | static int si_compar(const void *key, const void *elem) { |
242 | const adns_status *st= key; |
243 | const struct sinfo *si= elem; |
244 | |
245 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; |
246 | } |
247 | |
9da4a044 |
248 | static const struct sinfo *findsinfo(adns_status st) { |
249 | return bsearch(&st,sinfos,sizeof(sinfos)/sizeof(*sinfos),sizeof(*sinfos),si_compar); |
250 | } |
251 | |
e576be50 |
252 | const char *adns_strerror(adns_status st) { |
9da4a044 |
253 | const struct sinfo *si; |
86e7b8d9 |
254 | |
9da4a044 |
255 | si= findsinfo(st); |
256 | return si->string; |
257 | } |
258 | |
259 | const char *adns_errabbrev(adns_status st) { |
86e7b8d9 |
260 | const struct sinfo *si; |
261 | |
9da4a044 |
262 | si= findsinfo(st); |
263 | return si->abbrev; |
e576be50 |
264 | } |
88372443 |
265 | |
266 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
09957b1c |
267 | int (*needswap)(void *context, const void *a, const void *b), |
268 | void *context) { |
88372443 |
269 | byte *data= array; |
270 | int i, place; |
271 | |
272 | for (i=0; i<nobjs; i++) { |
09957b1c |
273 | for (place= i; |
274 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); |
275 | place--); |
88372443 |
276 | if (place != i) { |
277 | memcpy(tempbuf, data + i*sz, sz); |
278 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); |
279 | memcpy(data + place*sz, tempbuf, sz); |
280 | } |
281 | } |
282 | } |
ac868fa8 |
283 | |
284 | /* SIGPIPE protection. */ |
285 | |
286 | void adns__sigpipe_protect(adns_state ads) { |
287 | sigset_t toblock; |
288 | struct sigaction sa; |
289 | int r; |
290 | |
291 | if (ads->iflags & adns_if_nosigpipe) return; |
292 | |
293 | sigfillset(&toblock); |
294 | sigdelset(&toblock,SIGPIPE); |
295 | |
296 | sa.sa_handler= SIG_IGN; |
297 | sigfillset(&sa.sa_mask); |
298 | sa.sa_flags= 0; |
299 | |
300 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); |
301 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); |
302 | } |
303 | |
304 | void adns__sigpipe_unprotect(adns_state ads) { |
305 | int r; |
306 | |
307 | if (ads->iflags & adns_if_nosigpipe) return; |
308 | |
309 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); |
310 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); |
311 | } |