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1 | /**/ |
2 | |
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3 | #include <stdarg.h> |
4 | #include <stdio.h> |
5 | #include <errno.h> |
6 | #include <string.h> |
7 | #include <stdlib.h> |
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8 | #include <assert.h> |
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9 | #include <unistd.h> |
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10 | |
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11 | #include <netdb.h> |
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12 | #include <arpa/nameser.h> |
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13 | #include <sys/socket.h> |
14 | #include <netinet/in.h> |
15 | #include <arpa/inet.h> |
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16 | |
17 | #include "adns-internal.h" |
18 | |
19 | #define LIST_UNLINK(list,node) \ |
20 | do { \ |
21 | if ((node)->back) (node)->back->next= (node)->next; \ |
22 | else (list).head= (node)->next; \ |
23 | if ((node)->next) (node)->next->back= (node)->back; \ |
24 | else (list).tail= (node)->back; \ |
25 | } while(0) |
26 | |
27 | #define LIST_LINK_TAIL(list,node) \ |
28 | do { \ |
29 | (node)->back= 0; \ |
30 | (node)->next= (list).tail; \ |
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31 | if ((list).tail) (list).tail->back= (node); else (list).head= (node); \ |
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32 | (list).tail= (node); \ |
33 | } while(0) |
34 | |
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35 | static void vdebug(adns_state ads, const char *fmt, va_list al) { |
36 | if (!(ads->iflags & adns_if_debug)) return; |
37 | fputs("adns debug: ",stderr); |
38 | vfprintf(stderr,fmt,al); |
39 | fputc('\n',stderr); |
40 | } |
41 | |
42 | static void debug(adns_state ads, const char *fmt, ...) { |
43 | va_list al; |
44 | |
45 | va_start(al,fmt); |
46 | vdebug(ads,fmt,al); |
47 | va_end(al); |
48 | } |
49 | |
50 | static void vdiag(adns_state ads, const char *fmt, va_list al) { |
51 | if (ads->iflags & adns_if_noerrprint) return; |
52 | fputs("adns: ",stderr); |
53 | vfprintf(stderr,fmt,al); |
54 | fputc('\n',stderr); |
55 | } |
56 | |
57 | static void diag(adns_state ads, const char *fmt, ...) { |
58 | va_list al; |
59 | |
60 | va_start(al,fmt); |
61 | vdiag(ads,fmt,al); |
62 | va_end(al); |
63 | } |
64 | |
65 | static void addserver(adns_state ads, struct in_addr addr) { |
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66 | int i; |
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67 | struct server *ss; |
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68 | |
69 | for (i=0; i<ads->nservers; i++) { |
70 | if (ads->servers[i].addr.s_addr == addr.s_addr) { |
71 | debug(ads,"duplicate nameserver %s ignored",inet_ntoa(addr)); |
72 | return; |
73 | } |
74 | } |
75 | |
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76 | if (ads->nservers>=MAXSERVERS) { |
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77 | diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr)); |
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78 | return; |
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79 | } |
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80 | |
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81 | ss= ads->servers+ads->nservers; |
82 | ss->addr= addr; |
83 | ss->state= server_disc; |
84 | ss->connw.head= ss->connw.tail= 0; |
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85 | ads->nservers++; |
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86 | } |
87 | |
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88 | static void configparseerr(adns_state ads, const char *fn, int lno, |
89 | const char *fmt, ...) { |
90 | va_list al; |
91 | |
92 | if (ads->iflags & adns_if_noerrprint) return; |
93 | if (lno==-1) fprintf(stderr,"adns: %s: ",fn); |
94 | else fprintf(stderr,"adns: %s:%d: ",fn,lno); |
95 | va_start(al,fmt); |
96 | vfprintf(stderr,fmt,al); |
97 | va_end(al); |
98 | fputc('\n',stderr); |
99 | } |
100 | |
101 | static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) { |
102 | struct in_addr ia; |
103 | |
104 | if (!inet_aton(buf,&ia)) { |
105 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
106 | return; |
107 | } |
108 | debug(ads,"using nameserver %s",inet_ntoa(ia)); |
109 | addserver(ads,ia); |
110 | } |
111 | |
112 | static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) { |
113 | if (!buf) return; |
114 | diag(ads,"warning - `search' ignored FIXME"); |
115 | } |
116 | |
117 | static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) { |
118 | diag(ads,"warning - `sortlist' ignored FIXME"); |
119 | } |
120 | |
121 | static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) { |
122 | if (!buf) return; |
123 | diag(ads,"warning - `options' ignored FIXME"); |
124 | } |
125 | |
126 | static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) { |
127 | ads->nservers= 0; |
128 | } |
129 | |
130 | static const struct configcommandinfo { |
131 | const char *name; |
132 | void (*fn)(adns_state ads, const char *fn, int lno, const char *buf); |
133 | } configcommandinfos[]= { |
134 | { "nameserver", ccf_nameserver }, |
135 | { "domain", ccf_search }, |
136 | { "search", ccf_search }, |
137 | { "sortlist", ccf_sortlist }, |
138 | { "options", ccf_options }, |
139 | { "clearnameservers", ccf_clearnss }, |
140 | { 0 } |
141 | }; |
142 | |
143 | static int whitespace(int c) { |
144 | return c==' ' || c=='\n' || c=='\t'; |
145 | } |
146 | |
147 | static void readconfig(adns_state ads, const char *filename) { |
148 | char linebuf[2000], *p, *q; |
149 | FILE *file; |
150 | int lno, l, c; |
151 | const struct configcommandinfo *ccip; |
152 | |
153 | file= fopen(filename,"r"); |
154 | if (!file) { |
155 | if (errno == ENOENT) { |
156 | debug(ads,"configuration file `%s' does not exist",filename); |
157 | return; |
158 | } |
159 | diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno)); |
160 | return; |
161 | } |
162 | |
163 | for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) { |
164 | l= strlen(linebuf); |
165 | if (!l) continue; |
166 | if (linebuf[l-1] != '\n' && !feof(file)) { |
167 | diag(ads,"%s:%d: line too long",filename,lno); |
168 | while ((c= getc(file)) != EOF && c != '\n') { } |
169 | if (c == EOF) break; |
170 | continue; |
171 | } |
172 | while (l>0 && whitespace(linebuf[l-1])) l--; |
173 | linebuf[l]= 0; |
174 | p= linebuf; |
175 | while (whitespace(*p)) p++; |
176 | if (*p == '#' || *p == '\n') continue; |
177 | q= p; |
178 | while (*q && !whitespace(*q)) q++; |
179 | for (ccip=configcommandinfos; |
180 | ccip->name && strncmp(ccip->name,p,q-p); |
181 | ccip++); |
182 | if (!ccip->name) { |
183 | diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p); |
184 | continue; |
185 | } |
186 | while (whitespace(*q)) q++; |
187 | ccip->fn(ads,filename,lno,q); |
188 | } |
189 | if (ferror(file)) { |
190 | diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno)); |
191 | } |
192 | fclose(file); |
193 | } |
194 | |
195 | static const char *instrum_getenv(adns_state ads, const char *envvar) { |
196 | const char *value; |
197 | |
198 | value= getenv(envvar); |
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199 | if (!value) debug(ads,"environment variable %s not set",envvar); |
200 | else debug(ads,"environment variable %s set to `%s'",envvar,value); |
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201 | return value; |
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202 | } |
203 | |
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204 | static void readconfigenv(adns_state ads, const char *envvar) { |
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205 | const char *filename; |
206 | |
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207 | if (ads->iflags & adns_if_noenv) { |
208 | debug(ads,"not checking environment variable `%s'",envvar); |
209 | return; |
210 | } |
211 | filename= instrum_getenv(ads,envvar); |
212 | if (filename) readconfig(ads,filename); |
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213 | } |
214 | |
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215 | int adns_init(adns_state *ads_r, adns_initflags flags) { |
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216 | adns_state ads; |
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217 | const char *res_options, *adns_res_options; |
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218 | struct protoent *proto; |
219 | struct sockaddr_in udpaddr; |
220 | int udpaddrlen, r; |
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221 | |
222 | ads= malloc(sizeof(*ads)); if (!ads) return errno; |
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223 | ads->input.head= ads->input.tail= 0; |
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224 | ads->timew.head= ads->timew.tail= 0; |
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225 | ads->childw.head= ads->childw.tail= 0; |
226 | ads->output.head= ads->output.tail= 0; |
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227 | ads->nextid= 0x311f; |
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228 | ads->udpsocket= -1; |
229 | ads->qbufavail= 0; |
230 | ads->qbuf= 0; |
231 | ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0; |
232 | ads->tcpbuf= 0; |
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233 | ads->iflags= flags; |
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234 | ads->nservers= 0; |
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235 | ads->iflags= flags; |
236 | |
237 | res_options= instrum_getenv(ads,"RES_OPTIONS"); |
238 | adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS"); |
239 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
240 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
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241 | |
242 | readconfig(ads,"/etc/resolv.conf"); |
243 | readconfigenv(ads,"RES_CONF"); |
244 | readconfigenv(ads,"ADNS_RES_CONF"); |
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245 | |
246 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
247 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
248 | |
249 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); |
250 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); |
251 | |
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252 | if (!ads->nservers) { |
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253 | struct in_addr ia; |
254 | if (ads->iflags & adns_if_debug) |
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255 | fprintf(stderr,"adns: no nameservers, using localhost\n"); |
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256 | ia.s_addr= INADDR_LOOPBACK; |
257 | addserver(ads,ia); |
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258 | } |
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259 | |
260 | proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; } |
261 | ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto); |
262 | if (!ads->udpsocket) { r= errno; goto x_closeudp; } |
263 | |
264 | memset(&udpaddr,0,sizeof(udpaddr)); |
265 | udpaddr.sin_family= AF_INET; |
266 | udpaddr.sin_addr.s_addr= INADDR_ANY; |
267 | udpaddr.sin_port= 0; |
268 | r= bind(ads->udpsocket,&udpaddr,sizeof(udpaddr)); |
269 | if (r) { r= errno; goto x_closeudp; } |
270 | |
271 | udpaddrlen= sizeof(udpaddr); |
272 | r= getsockname(ads->udpsocket,&udpaddr,&udpaddrlen); |
273 | if (r) { r= errno; goto x_closeudp; } |
274 | if (udpaddr.sin_family != AF_INET) { |
275 | diag(ads,"network API error: UDP socket not AF_INET but %lu", |
276 | (unsigned long)udpaddr.sin_family); |
277 | r= EPROTOTYPE; goto x_closeudp; |
278 | } |
279 | debug(ads,"UDP socket is %s:%u",inet_ntoa(udpaddr.sin_addr),ntohs(udpaddr.sin_port)); |
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280 | |
281 | *ads_r= ads; |
282 | return 0; |
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283 | |
284 | x_closeudp: |
285 | close(ads->udpsocket); |
286 | x_free: |
287 | free(ads); |
288 | return r; |
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289 | } |
290 | |
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291 | static void query_fail(adns_state ads, adns_query qu, adns_status stat) { |
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292 | adns_answer *ans; |
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293 | |
294 | ans= qu->answer; |
295 | if (!ans) ans= malloc(sizeof(*qu->answer)); |
296 | if (ans) { |
297 | ans->status= stat; |
298 | ans->cname= 0; |
299 | ans->type= qu->type; |
300 | ans->nrrs= 0; |
301 | } |
302 | qu->answer= ans; |
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303 | LIST_LINK_TAIL(ads->input,qu); |
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304 | } |
305 | |
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306 | int adns_finish(adns_state ads) { |
307 | abort(); /* FIXME */ |
308 | } |
309 | |
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310 | void adns_interest(adns_state ads, int *maxfd, |
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311 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, |
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312 | struct timeval **tv_io, struct timeval *tvbuf) { |
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313 | abort(); /* FIXME */ |
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314 | } |
315 | |
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316 | static void autosys(adns_state ads) { |
317 | if (ads->iflags & adns_if_noautosys) return; |
318 | adns_callback(ads,-1,0,0,0); |
319 | } |
320 | |
321 | void adns_cancel(adns_state ads, adns_query query) { |
322 | abort(); /* FIXME */ |
323 | } |
324 | |
325 | int adns_callback(adns_state ads, int maxfd, |
326 | const fd_set *readfds, const fd_set *writefds, |
327 | const fd_set *exceptfds) { |
328 | abort(); /* FIXME */ |
329 | } |
330 | |
331 | static int internal_check(adns_state ads, |
332 | adns_query *query_io, |
333 | adns_answer *answer, |
334 | void *context_r) { |
335 | abort(); /* FIXME */ |
336 | } |
337 | |
338 | int adns_wait(adns_state ads, |
339 | adns_query *query_io, |
340 | adns_answer *answer, |
341 | void *context_r) { |
342 | int r, maxfd, rsel, rcb; |
343 | fd_set readfds, writefds, exceptfds; |
344 | struct timeval tvbuf, *tvp; |
345 | |
346 | for (;;) { |
347 | r= internal_check(ads,query_io,answer,context_r); |
348 | if (r && r != EWOULDBLOCK) return r; |
349 | FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds); |
350 | maxfd= 0; tvp= 0; |
351 | adns_interest(ads,&maxfd,&readfds,&writefds,&exceptfds,&tvp,&tvbuf); |
352 | rsel= select(maxfd,&readfds,&writefds,&exceptfds,tvp); |
353 | if (rsel==-1) return r; |
354 | rcb= adns_callback(ads,maxfd,&readfds,&writefds,&exceptfds); |
355 | assert(rcb==rsel); |
356 | } |
357 | } |
358 | |
359 | int adns_check(adns_state ads, |
360 | adns_query *query_io, |
361 | adns_answer *answer, |
362 | void *context_r) { |
363 | autosys(ads); |
364 | return internal_check(ads,query_io,answer,context_r); |
365 | } |
366 | |
367 | int adns_synchronous(adns_state ads, |
368 | const char *owner, |
369 | adns_rrtype type, |
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370 | adns_queryflags flags, |
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371 | adns_answer *answer) { |
372 | adns_query qu; |
373 | int r; |
374 | |
375 | r= adns_submit(ads,owner,type,flags,0,&qu); |
376 | if (r) return r; |
377 | |
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378 | do { |
379 | r= adns_wait(ads,&qu,answer,0); |
380 | } while (r==EINTR); |
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381 | if (r) adns_cancel(ads,qu); |
382 | return r; |
383 | } |
384 | |
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385 | static int mkquery(adns_state ads, |
386 | const char *owner, |
387 | adns_rrtype type) { |
388 | abort(); |
389 | } |
390 | |
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391 | int adns_submit(adns_state ads, |
392 | const char *owner, |
393 | adns_rrtype type, |
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394 | adns_queryflags flags, |
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395 | void *context, |
396 | adns_query *query_r) { |
397 | adns_query qu; |
398 | adns_status stat; |
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399 | int ol; |
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400 | |
401 | stat= 0; |
402 | ol= strlen(owner); |
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403 | if (ol>MAXDNAME+1) { stat= adns_s_invaliddomain; ol= 0; } |
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404 | if (ol>0 && owner[ol-1]=='.') { flags &= ~adns_f_search; ol--; } |
405 | qu= malloc(sizeof(*qu)+ol+1); if (!qu) return errno; |
406 | qu->next= qu->back= qu->parent= qu->child= 0; |
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407 | qu->id= ads->nextid++; |
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408 | qu->type= type; |
409 | qu->answer= 0; |
410 | qu->flags= flags; |
411 | qu->context= context; |
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412 | qu->udpretries= 0; |
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413 | qu->sentudp= qu->senttcp= 0; |
414 | qu->nextserver= 0; |
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415 | memcpy(qu->owner,owner,ol); qu->owner[ol]= 0; |
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416 | |
417 | |
418 | mkquery(ads,owner,type); |
419 | |
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420 | if (stat) { |
421 | query_fail(ads,qu,stat); |
422 | } else { |
423 | LIST_LINK_TAIL(ads->input,qu); |
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424 | autosys(ads); |
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425 | } |
426 | *query_r= qu; |
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427 | return 0; |
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428 | } |