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1 | /**/ |
2 | |
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3 | #include <stdlib.h> |
4 | #include <errno.h> |
5 | #include <string.h> |
6 | #include <unistd.h> |
7 | #include <fcntl.h> |
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8 | |
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9 | #include <netdb.h> |
10 | #include <arpa/inet.h> |
11 | |
12 | #include "internal.h" |
13 | |
14 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
15 | int serv, const char *fmt, va_list al) { |
37e28fde |
16 | if (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent))) return; |
17 | if (serv>=0) { |
18 | fprintf(stderr,"adns%s: nameserver %s: ",pfx,inet_ntoa(ads->servers[serv].addr)); |
19 | } else { |
20 | fprintf(stderr,"adns%s: ",pfx); |
21 | } |
656b2da9 |
22 | vfprintf(stderr,fmt,al); |
23 | fputc('\n',stderr); |
24 | } |
25 | |
37e28fde |
26 | void adns__debug(adns_state ads, int serv, const char *fmt, ...) { |
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27 | va_list al; |
28 | |
29 | va_start(al,fmt); |
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30 | adns__vdiag(ads," debug",0,serv,fmt,al); |
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31 | va_end(al); |
32 | } |
33 | |
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34 | void adns__warn(adns_state ads, int serv, const char *fmt, ...) { |
37e28fde |
35 | va_list al; |
36 | |
37 | va_start(al,fmt); |
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38 | adns__vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,fmt,al); |
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39 | va_end(al); |
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40 | } |
41 | |
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42 | void adns__diag(adns_state ads, int serv, const char *fmt, ...) { |
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43 | va_list al; |
44 | |
45 | va_start(al,fmt); |
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46 | adns__vdiag(ads,"",adns_if_noerrprint,serv,fmt,al); |
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47 | va_end(al); |
48 | } |
49 | |
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50 | |
51 | void adns__vbuf_init(vbuf *vb) { |
52 | vb->used= vb->avail= 0; vb->buf= 0; |
53 | } |
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54 | |
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55 | int adns__vbuf_ensure(vbuf *vb, int want) { |
56 | void *nb; |
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57 | |
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58 | if (vb->avail >= want) return 1; |
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59 | nb= realloc(vb->buf,want); if (!nb) return 0; |
60 | vb->buf= nb; |
61 | vb->avail= want; |
62 | return 1; |
63 | } |
64 | |
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65 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
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66 | memcpy(vb->buf+vb->used,data,len); |
67 | vb->used+= len; |
68 | } |
69 | |
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70 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
71 | int newlen; |
72 | void *nb; |
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73 | |
74 | newlen= vb->used+len; |
75 | if (vb->avail < newlen) { |
76 | newlen <<= 1; |
77 | nb= realloc(vb->buf,newlen); |
78 | if (!nb) { newlen >>= 1; nb= realloc(vb->buf,newlen); } |
79 | if (!nb) return 0; |
80 | vb->buf= nb; |
81 | vb->avail= newlen; |
82 | } |
83 | adns__vbuf_appendq(vb,data,len); |
84 | return 1; |
85 | } |
86 | |
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87 | |
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88 | static void addserver(adns_state ads, struct in_addr addr) { |
89 | int i; |
90 | struct server *ss; |
91 | |
92 | for (i=0; i<ads->nservers; i++) { |
93 | if (ads->servers[i].addr.s_addr == addr.s_addr) { |
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94 | adns__debug(ads,-1,"duplicate nameserver %s ignored",inet_ntoa(addr)); |
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95 | return; |
96 | } |
97 | } |
98 | |
99 | if (ads->nservers>=MAXSERVERS) { |
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100 | adns__diag(ads,-1,"too many nameservers, ignoring %s",inet_ntoa(addr)); |
656b2da9 |
101 | return; |
102 | } |
103 | |
104 | ss= ads->servers+ads->nservers; |
105 | ss->addr= addr; |
656b2da9 |
106 | ads->nservers++; |
107 | } |
108 | |
109 | static void configparseerr(adns_state ads, const char *fn, int lno, |
110 | const char *fmt, ...) { |
111 | va_list al; |
112 | |
113 | if (ads->iflags & adns_if_noerrprint) return; |
114 | if (lno==-1) fprintf(stderr,"adns: %s: ",fn); |
115 | else fprintf(stderr,"adns: %s:%d: ",fn,lno); |
116 | va_start(al,fmt); |
117 | vfprintf(stderr,fmt,al); |
118 | va_end(al); |
119 | fputc('\n',stderr); |
120 | } |
121 | |
122 | static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) { |
123 | struct in_addr ia; |
124 | |
125 | if (!inet_aton(buf,&ia)) { |
126 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
127 | return; |
128 | } |
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129 | adns__debug(ads,-1,"using nameserver %s",inet_ntoa(ia)); |
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130 | addserver(ads,ia); |
131 | } |
132 | |
133 | static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) { |
134 | if (!buf) return; |
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135 | adns__diag(ads,-1,"warning - `search' ignored fixme"); |
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136 | } |
137 | |
138 | static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) { |
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139 | adns__diag(ads,-1,"warning - `sortlist' ignored fixme"); |
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140 | } |
141 | |
142 | static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) { |
143 | if (!buf) return; |
94436798 |
144 | adns__diag(ads,-1,"warning - `options' ignored fixme"); |
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145 | } |
146 | |
147 | static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) { |
148 | ads->nservers= 0; |
149 | } |
150 | |
151 | static const struct configcommandinfo { |
152 | const char *name; |
153 | void (*fn)(adns_state ads, const char *fn, int lno, const char *buf); |
154 | } configcommandinfos[]= { |
155 | { "nameserver", ccf_nameserver }, |
156 | { "domain", ccf_search }, |
157 | { "search", ccf_search }, |
158 | { "sortlist", ccf_sortlist }, |
159 | { "options", ccf_options }, |
160 | { "clearnameservers", ccf_clearnss }, |
161 | { 0 } |
162 | }; |
163 | |
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164 | static void readconfig(adns_state ads, const char *filename) { |
165 | char linebuf[2000], *p, *q; |
166 | FILE *file; |
167 | int lno, l, c; |
168 | const struct configcommandinfo *ccip; |
169 | |
170 | file= fopen(filename,"r"); |
171 | if (!file) { |
172 | if (errno == ENOENT) { |
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173 | adns__debug(ads,-1,"configuration file `%s' does not exist",filename); |
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174 | return; |
175 | } |
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176 | adns__diag(ads,-1,"cannot open configuration file `%s': %s", |
177 | filename,strerror(errno)); |
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178 | return; |
179 | } |
180 | |
181 | for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) { |
182 | l= strlen(linebuf); |
183 | if (!l) continue; |
184 | if (linebuf[l-1] != '\n' && !feof(file)) { |
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185 | adns__diag(ads,-1,"%s:%d: line too long",filename,lno); |
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186 | while ((c= getc(file)) != EOF && c != '\n') { } |
187 | if (c == EOF) break; |
188 | continue; |
189 | } |
190 | while (l>0 && ctype_whitespace(linebuf[l-1])) l--; |
191 | linebuf[l]= 0; |
192 | p= linebuf; |
193 | while (ctype_whitespace(*p)) p++; |
194 | if (*p == '#' || *p == '\n') continue; |
195 | q= p; |
196 | while (*q && !ctype_whitespace(*q)) q++; |
197 | for (ccip=configcommandinfos; |
198 | ccip->name && strncmp(ccip->name,p,q-p); |
199 | ccip++); |
200 | if (!ccip->name) { |
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201 | adns__diag(ads,-1,"%s:%d: unknown configuration directive `%.*s'", |
202 | filename,lno,q-p,p); |
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203 | continue; |
204 | } |
205 | while (ctype_whitespace(*q)) q++; |
206 | ccip->fn(ads,filename,lno,q); |
207 | } |
208 | if (ferror(file)) { |
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209 | adns__diag(ads,-1,"%s:%d: read error: %s",filename,lno,strerror(errno)); |
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210 | } |
211 | fclose(file); |
212 | } |
213 | |
214 | static const char *instrum_getenv(adns_state ads, const char *envvar) { |
215 | const char *value; |
216 | |
217 | value= getenv(envvar); |
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218 | if (!value) adns__debug(ads,-1,"environment variable %s not set",envvar); |
219 | else adns__debug(ads,-1,"environment variable %s set to `%s'",envvar,value); |
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220 | return value; |
221 | } |
222 | |
223 | static void readconfigenv(adns_state ads, const char *envvar) { |
224 | const char *filename; |
225 | |
226 | if (ads->iflags & adns_if_noenv) { |
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227 | adns__debug(ads,-1,"not checking environment variable `%s'",envvar); |
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228 | return; |
229 | } |
230 | filename= instrum_getenv(ads,envvar); |
231 | if (filename) readconfig(ads,filename); |
232 | } |
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233 | |
234 | |
235 | int adns__setnonblock(adns_state ads, int fd) { |
236 | int r; |
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237 | |
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238 | r= fcntl(fd,F_GETFL,0); if (r<0) return errno; |
239 | r |= O_NONBLOCK; |
240 | r= fcntl(fd,F_SETFL,r); if (r<0) return errno; |
241 | return 0; |
242 | } |
243 | |
244 | int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) { |
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245 | adns_state ads; |
246 | const char *res_options, *adns_res_options; |
247 | struct protoent *proto; |
248 | int r; |
249 | |
250 | ads= malloc(sizeof(*ads)); if (!ads) return errno; |
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251 | ads->iflags= flags; |
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252 | ads->diagfile= diagfile ? diagfile : stderr; |
253 | LIST_INIT(ads->timew); |
254 | LIST_INIT(ads->childw); |
255 | LIST_INIT(ads->output); |
256 | ads->nextid= 0x311f; |
257 | ads->udpsocket= ads->tcpsocket= -1; |
258 | adns__vbuf_init(&ads->rqbuf); |
259 | adns__vbuf_init(&ads->tcpsend); |
260 | adns__vbuf_init(&ads->tcprecv); |
261 | ads->nservers= ads->tcpserver= 0; |
262 | ads->tcpstate= server_disconnected; |
263 | timerclear(&ads->tcptimeout); |
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264 | |
265 | res_options= instrum_getenv(ads,"RES_OPTIONS"); |
266 | adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS"); |
267 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
268 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
269 | |
270 | readconfig(ads,"/etc/resolv.conf"); |
271 | readconfigenv(ads,"RES_CONF"); |
272 | readconfigenv(ads,"ADNS_RES_CONF"); |
273 | |
274 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
275 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
276 | |
277 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); |
278 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); |
279 | |
280 | if (!ads->nservers) { |
281 | struct in_addr ia; |
282 | if (ads->iflags & adns_if_debug) |
283 | fprintf(stderr,"adns: no nameservers, using localhost\n"); |
284 | ia.s_addr= INADDR_LOOPBACK; |
285 | addserver(ads,ia); |
286 | } |
287 | |
288 | proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; } |
289 | ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto); |
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290 | if (ads->udpsocket<0) { r= errno; goto x_free; } |
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291 | |
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292 | r= adns__setnonblock(ads,ads->udpsocket); |
293 | if (r) { r= errno; goto x_closeudp; } |
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294 | |
295 | *ads_r= ads; |
296 | return 0; |
297 | |
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298 | x_closeudp: |
299 | close(ads->udpsocket); |
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300 | x_free: |
301 | free(ads); |
302 | return r; |
303 | } |
304 | |
305 | int adns_finish(adns_state ads) { |
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306 | abort(); /* fixme */ |
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307 | } |