mdw@git.distorted.org.uk Git - adns/blob - src/setup.c

   1 /*
   2  * setup.c
   3  * - configuration file parsing
   4  * - management of global state
   5  */
   6 /*
   7  *  This file is part of adns, which is
   8  *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
   9  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  10  *    Copyright (C) 1991 Massachusetts Institute of Technology
  11  *  (See the file INSTALL for full details.)
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2, or (at your option)
  16  *  any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software Foundation,
  25  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <limits.h>
  31 #include <unistd.h>
  32 #include <fcntl.h>
  33
  34 #include <sys/types.h>
  35 #include <netdb.h>
  36 #include <sys/socket.h>
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39
  40 #include "internal.h"
  41
  42 static void readconfig(adns_state ads, const char *filename, int warnmissing);
  43
  44 static const afinfo *const transport_aftab[] = {
  45   &adns__inet_afinfo,
  46   &adns__inet6_afinfo,
  47   0
  48 };
  49
  50 static const afinfo *find_afinfo(int af)
  51 {
  52   int i;
  53
  54   for (i = 0; transport_aftab[i]; i++)
  55     if (transport_aftab[i]->af == af) return transport_aftab[i];
  56   return 0;
  57 }
  58
  59 static void addserver(adns_state ads, struct sockaddr *sa, int n) {
  60   int i;
  61   adns_rr_addr *ss;
  62   const afinfo *ai;
  63
  64   ai = find_afinfo(sa->sa_family);
  65   if (!ai) {
  66     adns__diag(ads,-1,0,
  67                "nameserver %s for unknown address family %d ignored",
  68                adns__sockaddr_ntoa(sa, n), sa->sa_family);
  69   }
  70
  71   for (i=0; i<ads->nservers; i++) {
  72     if (ads->servers[i].addr.sa.sa_family == sa->sa_family &&
  73         ai->sockaddr_equalp(sa, &ads->servers[i].addr.sa)) {
  74       adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
  75                   adns__sockaddr_ntoa(sa, n));
  76       return;
  77     }
  78   }
  79
  80   if (ads->nservers>=MAXSERVERS) {
  81     adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
  82                adns__sockaddr_ntoa(sa, n));
  83     return;
  84   }
  85
  86   ss= ads->servers+ads->nservers;
  87   assert(n <= sizeof(ss->addr));
  88   ss->len = n;
  89   memcpy(&ss->addr, sa, n);
  90   ads->nservers++;
  91 }
  92
  93 static void freesearchlist(adns_state ads) {
  94   if (ads->nsearchlist) free(*ads->searchlist);
  95   free(ads->searchlist);
  96 }
  97
  98 static void saveerr(adns_state ads, int en) {
  99   if (!ads->configerrno) ads->configerrno= en;
 100 }
 101
 102 static void configparseerr(adns_state ads, const char *fn, int lno,
 103                            const char *fmt, ...) {
 104   va_list al;
 105
 106   saveerr(ads,EINVAL);
 107   if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
 108
 109   if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
 110   else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
 111   va_start(al,fmt);
 112   adns__vlprintf(ads,fmt,al);
 113   va_end(al);
 114   adns__lprintf(ads,"\n");
 115 }
 116
 117 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
 118   const char *p, *q;
 119
 120   p= *bufp_io;
 121   while (ctype_whitespace(*p)) p++;
 122   if (!*p) return 0;
 123
 124   q= p;
 125   while (*q && !ctype_whitespace(*q)) q++;
 126
 127   *l_r= q-p;
 128   *word_r= p;
 129   *bufp_io= q;
 130
 131   return 1;
 132 }
 133
 134 static void ccf_nameserver(adns_state ads, const char *fn,
 135                            int lno, const char *buf) {
 136   struct addrinfo *ai, ai_hint = { 0 };
 137   int err;
 138
 139   ai_hint.ai_family = AF_UNSPEC;
 140   ai_hint.ai_socktype = SOCK_DGRAM;
 141   ai_hint.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
 142
 143   err = getaddrinfo(buf, STRINGIFY(DNS_PORT), &ai_hint, &ai);
 144   if (err) {
 145     configparseerr(ads,fn,lno,"invalid nameserver address `%s' (%s)",
 146                    buf, gai_strerror(err));
 147     return;
 148   }
 149
 150   adns__debug(ads,-1,0,"using nameserver %s",
 151               adns__sockaddr_ntoa(ai->ai_addr, ai->ai_addrlen));
 152   addserver(ads, ai->ai_addr, ai->ai_addrlen);
 153   freeaddrinfo(ai);
 154 }
 155
 156 static void ccf_search(adns_state ads, const char *fn,
 157                        int lno, const char *buf) {
 158   const char *bufp, *word;
 159   char *newchars, **newptrs, **pp;
 160   int count, tl, l;
 161
 162   if (!buf) return;
 163
 164   bufp= buf;
 165   count= 0;
 166   tl= 0;
 167   while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
 168
 169   newptrs= malloc(sizeof(char*)*count);
 170   if (!newptrs) { saveerr(ads,errno); return; }
 171
 172   newchars= malloc(tl);
 173   if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
 174
 175   bufp= buf;
 176   pp= newptrs;
 177   while (nextword(&bufp,&word,&l)) {
 178     *pp++= newchars;
 179     memcpy(newchars,word,l);
 180     newchars += l;
 181     *newchars++ = 0;
 182   }
 183
 184   freesearchlist(ads);
 185   ads->nsearchlist= count;
 186   ads->searchlist= newptrs;
 187 }
 188
 189 static void ccf_sortlist(adns_state ads, const char *fn,
 190                          int lno, const char *buf) {
 191   const char *word;
 192   char tbuf[200], *slash, *ep;
 193   const char *maskwhat;
 194   struct sortlist *sl;
 195   int l;
 196   const afinfo *ai;
 197   int initial = -1;
 198
 199   if (!buf) return;
 200
 201   ads->nsortlist= 0;
 202   while (nextword(&buf,&word,&l)) {
 203     if (ads->nsortlist >= MAXSORTLIST) {
 204       adns__diag(ads,-1,0,"too many sortlist entries,"
 205                  " ignoring %.*s onwards",l,word);
 206       return;
 207     }
 208
 209     if (l >= sizeof(tbuf)) {
 210       configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
 211       continue;
 212     }
 213
 214     memcpy(tbuf,word,l); tbuf[l]= 0;
 215     slash= strchr(tbuf,'/');
 216     if (slash) *slash++= 0;
 217
 218     sl= &ads->sortlist[ads->nsortlist];
 219
 220     if (strchr(tbuf, ':'))
 221       ai= &adns__inet6_afinfo;
 222     else
 223       ai= &adns__inet_afinfo;
 224
 225     if (!inet_pton(ai->af, tbuf, &sl->base)) {
 226       configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
 227       continue;
 228     }
 229
 230     if (slash) {
 231       if (strchr(slash,ai->delim)) {
 232         maskwhat = "mask";
 233         if (!inet_pton(ai->af,slash,&sl->mask)) {
 234           configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
 235           continue;
 236         }
 237       } else {
 238         maskwhat = "prefix length";
 239         initial= strtoul(slash,&ep,10);
 240         if (*ep || initial>ai->width) {
 241           configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
 242           continue;
 243         }
 244         ai->prefix_mask(initial, &sl->mask);
 245       }
 246     } else {
 247       maskwhat = "implied prefix length";
 248       initial = ai->guess_len(&sl->base);
 249       if (initial < 0) {
 250         configparseerr(ads,fn,lno, "network address `%s'"
 251                        " in sortlist is not in classed ranges,"
 252                        " must specify mask explicitly", tbuf);
 253         continue;
 254       }
 255       ai->prefix_mask(initial, &sl->mask);
 256     }
 257
 258     if (!ai->matchp(&sl->base, &sl->base, &sl->mask)) {
 259       if (initial >= 0) {
 260         configparseerr(ads,fn,lno, "%s %d in sortlist"
 261                        " overlaps address `%s'",maskwhat,initial,tbuf);
 262       } else {
 263         configparseerr(ads,fn,lno, "%s `%s' in sortlist"
 264                        " overlaps address `%s'",maskwhat,slash,tbuf);
 265       }
 266       continue;
 267     }
 268
 269     sl->ai = ai;
 270     ads->nsortlist++;
 271   }
 272 }
 273
 274 static void ccf_options(adns_state ads, const char *fn,
 275                         int lno, const char *buf) {
 276   const char *word;
 277   char *ep;
 278   unsigned long v;
 279   int l;
 280
 281   if (!buf) return;
 282
 283   while (nextword(&buf,&word,&l)) {
 284     if (l==5 && !memcmp(word,"debug",5)) {
 285       ads->iflags |= adns_if_debug;
 286       continue;
 287     }
 288     if (l>=6 && !memcmp(word,"ndots:",6)) {
 289       v= strtoul(word+6,&ep,10);
 290       if (l==6 || ep != word+l || v > INT_MAX) {
 291         configparseerr(ads,fn,lno,"option `%.*s' malformed"
 292                        " or has bad value",l,word);
 293         continue;
 294       }
 295       ads->searchndots= v;
 296       continue;
 297     }
 298     if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
 299       if (!strcmp(word+12,"none")) {
 300         ads->iflags &= ~adns_if_checkc_freq;
 301         ads->iflags |= adns_if_checkc_entex;
 302       } else if (!strcmp(word+12,"entex")) {
 303         ads->iflags &= ~adns_if_checkc_freq;
 304         ads->iflags |= adns_if_checkc_entex;
 305       } else if (!strcmp(word+12,"freq")) {
 306         ads->iflags |= adns_if_checkc_freq;
 307       } else {
 308         configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
 309                        "(must be none, entex or freq", word+12);
 310       }
 311       continue;
 312     }
 313     adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
 314   }
 315 }
 316
 317 static void ccf_clearnss(adns_state ads, const char *fn,
 318                          int lno, const char *buf) {
 319   ads->nservers= 0;
 320 }
 321
 322 static void ccf_include(adns_state ads, const char *fn,
 323                         int lno, const char *buf) {
 324   if (!*buf) {
 325     configparseerr(ads,fn,lno,"`include' directive with no filename");
 326     return;
 327   }
 328   readconfig(ads,buf,1);
 329 }
 330
 331 static void ccf_lookup(adns_state ads, const char *fn, int lno,
 332                        const char *buf) {
 333   int found_bind=0;
 334   const char *word;
 335   int l;
 336
 337   if (!*buf) {
 338     configparseerr(ads,fn,lno,"`lookup' directive with no databases");
 339     return;
 340   }
 341
 342   while (nextword(&buf,&word,&l)) {
 343     if (l==4 && !memcmp(word,"bind",4)) {
 344       found_bind=1;
 345     } else if (l==4 && !memcmp(word,"file",4)) {
 346       /* ignore this and hope /etc/hosts is not essential */
 347     } else if (l==2 && !memcmp(word,"yp",2)) {
 348       adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
 349       found_bind=-1;
 350     } else {
 351       adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
 352                  fn,lno, l,word);
 353       found_bind=-1;
 354     }
 355   }
 356   if (!found_bind)
 357     adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
 358 }
 359
 360 static const struct configcommandinfo {
 361   const char *name;
 362   void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
 363 } configcommandinfos[]= {
 364   { "nameserver",        ccf_nameserver  },
 365   { "domain",            ccf_search      },
 366   { "search",            ccf_search      },
 367   { "sortlist",          ccf_sortlist    },
 368   { "options",           ccf_options     },
 369   { "clearnameservers",  ccf_clearnss    },
 370   { "include",           ccf_include     },
 371   { "lookup",            ccf_lookup      }, /* OpenBSD */
 372   {  0                                   }
 373 };
 374
 375 typedef union {
 376   FILE *file;
 377   const char *text;
 378 } getline_ctx;
 379
 380 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
 381                    int lno, char *buf, int buflen) {
 382   FILE *file= src_io->file;
 383   int c, i;
 384   char *p;
 385
 386   p= buf;
 387   buflen--;
 388   i= 0;
 389
 390   for (;;) { /* loop over chars */
 391     if (i == buflen) {
 392       adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 393       goto x_badline;
 394     }
 395     c= getc(file);
 396     if (!c) {
 397       adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
 398       goto x_badline;
 399     } else if (c == '\n') {
 400       break;
 401     } else if (c == EOF) {
 402       if (ferror(file)) {
 403         saveerr(ads,errno);
 404         adns__diag(ads,-1,0,"%s:%d: read error: %s",
 405                    filename,lno,strerror(errno));
 406         return -1;
 407       }
 408       if (!i) return -1;
 409       break;
 410     } else {
 411       *p++= c;
 412       i++;
 413     }
 414   }
 415
 416   *p++= 0;
 417   return i;
 418
 419  x_badline:
 420   saveerr(ads,EINVAL);
 421   while ((c= getc(file)) != EOF && c != '\n');
 422   return -2;
 423 }
 424
 425 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
 426                    int lno, char *buf, int buflen) {
 427   const char *cp= src_io->text;
 428   int l;
 429
 430   if (!cp || !*cp) return -1;
 431
 432   if (*cp == ';' || *cp == '\n') cp++;
 433   l= strcspn(cp,";\n");
 434   src_io->text = cp+l;
 435
 436   if (l >= buflen) {
 437     adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 438     saveerr(ads,EINVAL);
 439     return -2;
 440   }
 441
 442   memcpy(buf,cp,l);
 443   buf[l]= 0;
 444   return l;
 445 }
 446
 447 static void readconfiggeneric(adns_state ads, const char *filename,
 448                               int (*getline)(adns_state ads, getline_ctx*,
 449                                              const char *filename, int lno,
 450                                              char *buf, int buflen),
 451                               /* Returns >=0 for success, -1 for EOF or error
 452                                * (error will have been reported), or -2 for
 453                                * bad line was encountered, try again.
 454                                */
 455                               getline_ctx gl_ctx) {
 456   char linebuf[2000], *p, *q;
 457   int lno, l, dirl;
 458   const struct configcommandinfo *ccip;
 459
 460   for (lno=1;
 461        (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
 462        lno++) {
 463     if (l == -2) continue;
 464     while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
 465     linebuf[l]= 0;
 466     p= linebuf;
 467     while (ctype_whitespace(*p)) p++;
 468     if (*p == '#' || *p == ';' || !*p) continue;
 469     q= p;
 470     while (*q && !ctype_whitespace(*q)) q++;
 471     dirl= q-p;
 472     for (ccip=configcommandinfos;
 473          ccip->name &&
 474            !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
 475          ccip++);
 476     if (!ccip->name) {
 477       adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
 478                  filename,lno,(int)(q-p),p);
 479       continue;
 480     }
 481     while (ctype_whitespace(*q)) q++;
 482     ccip->fn(ads,filename,lno,q);
 483   }
 484 }
 485
 486 static const char *instrum_getenv(adns_state ads, const char *envvar) {
 487   const char *value;
 488
 489   value= getenv(envvar);
 490   if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
 491   else adns__debug(ads,-1,0,"environment variable %s"
 492                    " set to `%s'",envvar,value);
 493   return value;
 494 }
 495
 496 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
 497   getline_ctx gl_ctx;
 498
 499   gl_ctx.file= fopen(filename,"r");
 500   if (!gl_ctx.file) {
 501     if (errno == ENOENT) {
 502       if (warnmissing)
 503         adns__debug(ads,-1,0, "configuration file"
 504                     " `%s' does not exist",filename);
 505       return;
 506     }
 507     saveerr(ads,errno);
 508     adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
 509                filename,strerror(errno));
 510     return;
 511   }
 512
 513   readconfiggeneric(ads,filename,gl_file,gl_ctx);
 514
 515   fclose(gl_ctx.file);
 516 }
 517
 518 static void readconfigtext(adns_state ads, const char *text,
 519                            const char *showname) {
 520   getline_ctx gl_ctx;
 521
 522   gl_ctx.text= text;
 523   readconfiggeneric(ads,showname,gl_text,gl_ctx);
 524 }
 525
 526 static void readconfigenv(adns_state ads, const char *envvar) {
 527   const char *filename;
 528
 529   if (ads->iflags & adns_if_noenv) {
 530     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 531     return;
 532   }
 533   filename= instrum_getenv(ads,envvar);
 534   if (filename) readconfig(ads,filename,1);
 535 }
 536
 537 static void readconfigenvtext(adns_state ads, const char *envvar) {
 538   const char *textdata;
 539
 540   if (ads->iflags & adns_if_noenv) {
 541     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 542     return;
 543   }
 544   textdata= instrum_getenv(ads,envvar);
 545   if (textdata) readconfigtext(ads,textdata,envvar);
 546 }
 547
 548
 549 int adns__setnonblock(adns_state ads, int fd) {
 550   int r;
 551
 552   r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
 553   r |= O_NONBLOCK;
 554   r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
 555   return 0;
 556 }
 557
 558 static int init_begin(adns_state *ads_r, adns_initflags flags,
 559                       adns_logcallbackfn *logfn, void *logfndata) {
 560   adns_state ads;
 561   pid_t pid;
 562
 563   ads= malloc(sizeof(*ads)); if (!ads) return errno;
 564
 565   ads->iflags= flags;
 566   ads->logfn= logfn;
 567   ads->logfndata= logfndata;
 568   ads->configerrno= 0;
 569   LIST_INIT(ads->udpw);
 570   LIST_INIT(ads->tcpw);
 571   LIST_INIT(ads->childw);
 572   LIST_INIT(ads->output);
 573   ads->forallnext= 0;
 574   ads->nextid= 0x311f;
 575   ads->nudp= 0;
 576   ads->tcpsocket= -1;
 577   adns__vbuf_init(&ads->tcpsend);
 578   adns__vbuf_init(&ads->tcprecv);
 579   ads->tcprecv_skip= 0;
 580   ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
 581   ads->searchndots= 1;
 582   ads->tcpstate= server_disconnected;
 583   timerclear(&ads->tcptimeout);
 584   ads->searchlist= 0;
 585
 586   pid= getpid();
 587   ads->rand48xsubi[0]= pid;
 588   ads->rand48xsubi[1]= (unsigned long)pid >> 16;
 589   ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
 590
 591   *ads_r= ads;
 592   return 0;
 593 }
 594
 595 static int init_finish(adns_state ads) {
 596   struct sockaddr_in sin;
 597   struct protoent *proto;
 598   struct udpsocket *udp;
 599   int i, j;
 600   int r;
 601
 602   if (!ads->nservers) {
 603     if (ads->logfn && ads->iflags & adns_if_debug)
 604       adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
 605     memset(&sin, 0, sizeof(sin));
 606     sin.sin_port = htons(DNS_PORT);
 607     sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 608     addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
 609   }
 610
 611   proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
 612   ads->nudp = 0;
 613   for (i = 0; i < ads->nservers; i++) {
 614     for (j = 0; j < ads->nudp; j++) {
 615       if (ads->udpsocket[j].ai->af == ads->servers[i].addr.sa.sa_family)
 616         goto afmatch;
 617     }
 618
 619     assert(ads->nudp < MAXUDP);
 620     udp = &ads->udpsocket[ads->nudp];
 621     udp->ai = find_afinfo(ads->servers[i].addr.sa.sa_family);
 622     assert(udp->ai);
 623     udp->fd = socket(udp->ai->af,SOCK_DGRAM,proto->p_proto);
 624     if (udp->fd < 0) { r= errno; goto x_free; }
 625     r= adns__setnonblock(ads,udp->fd);
 626     if (r) { r= errno; goto x_closeudp; }
 627     ads->nudp++;
 628
 629   afmatch:;
 630   }
 631
 632   return 0;
 633
 634  x_closeudp:
 635   for (j = 0; j < ads->nudp; j++) close(ads->udpsocket[j].fd);
 636  x_free:
 637   free(ads);
 638   return r;
 639 }
 640
 641 static void init_abort(adns_state ads) {
 642   if (ads->nsearchlist) {
 643     free(ads->searchlist[0]);
 644     free(ads->searchlist);
 645   }
 646   free(ads);
 647 }
 648
 649 static void logfn_file(adns_state ads, void *logfndata,
 650                        const char *fmt, va_list al) {
 651   vfprintf(logfndata,fmt,al);
 652 }
 653
 654 static int init_files(adns_state *ads_r, adns_initflags flags,
 655                       adns_logcallbackfn *logfn, void *logfndata) {
 656   adns_state ads;
 657   const char *res_options, *adns_res_options;
 658   int r;
 659
 660   r= init_begin(&ads, flags, logfn, logfndata);
 661   if (r) return r;
 662
 663   res_options= instrum_getenv(ads,"RES_OPTIONS");
 664   adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
 665   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 666   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 667
 668   readconfig(ads,"/etc/resolv.conf",1);
 669   readconfig(ads,"/etc/resolv-adns.conf",0);
 670   readconfigenv(ads,"RES_CONF");
 671   readconfigenv(ads,"ADNS_RES_CONF");
 672
 673   readconfigenvtext(ads,"RES_CONF_TEXT");
 674   readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
 675
 676   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 677   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 678
 679   ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
 680   ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
 681
 682   if (ads->configerrno && ads->configerrno != EINVAL) {
 683     r= ads->configerrno;
 684     init_abort(ads);
 685     return r;
 686   }
 687
 688   r= init_finish(ads);
 689   if (r) return r;
 690
 691   adns__consistency(ads,0,cc_entex);
 692   *ads_r= ads;
 693   return 0;
 694 }
 695
 696 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
 697   return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
 698 }
 699
 700 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
 701                        adns_logcallbackfn *logfn, void *logfndata,
 702                        const char *configtext) {
 703   adns_state ads;
 704   int r;
 705
 706   r= init_begin(&ads, flags, logfn, logfndata);
 707   if (r) return r;
 708
 709   readconfigtext(ads,configtext,"<supplied configuration text>");
 710   if (ads->configerrno) {
 711     r= ads->configerrno;
 712     init_abort(ads);
 713     return r;
 714   }
 715
 716   r= init_finish(ads);  if (r) return r;
 717   adns__consistency(ads,0,cc_entex);
 718   *ads_r= ads;
 719   return 0;
 720 }
 721
 722 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
 723                      FILE *diagfile, const char *configtext) {
 724   return init_strcfg(ads_r, flags,
 725                      diagfile ? logfn_file : 0, diagfile,
 726                      configtext);
 727 }
 728
 729 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
 730                     const char *configtext /*0=>use default config files*/,
 731                     adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
 732                     void *logfndata /*0 with logfn==0 => discard*/) {
 733   if (!logfn && logfndata)
 734     logfn= logfn_file;
 735   if (configtext)
 736     return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
 737   else
 738     return init_files(newstate_r, flags, logfn, logfndata);
 739 }
 740
 741 void adns_finish(adns_state ads) {
 742   int i;
 743   adns__consistency(ads,0,cc_entex);
 744   for (;;) {
 745     if (ads->udpw.head) adns_cancel(ads->udpw.head);
 746     else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
 747     else if (ads->childw.head) adns_cancel(ads->childw.head);
 748     else if (ads->output.head) adns_cancel(ads->output.head);
 749     else break;
 750   }
 751   for (i = 0; i < ads->nudp; i++) close(ads->udpsocket[i].fd);
 752   if (ads->tcpsocket >= 0) close(ads->tcpsocket);
 753   adns__vbuf_free(&ads->tcpsend);
 754   adns__vbuf_free(&ads->tcprecv);
 755   freesearchlist(ads);
 756   free(ads);
 757 }
 758
 759 void adns_forallqueries_begin(adns_state ads) {
 760   adns__consistency(ads,0,cc_entex);
 761   ads->forallnext=
 762     ads->udpw.head ? ads->udpw.head :
 763     ads->tcpw.head ? ads->tcpw.head :
 764     ads->childw.head ? ads->childw.head :
 765     ads->output.head;
 766 }
 767
 768 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
 769   adns_query qu, nqu;
 770
 771   adns__consistency(ads,0,cc_entex);
 772   nqu= ads->forallnext;
 773   for (;;) {
 774     qu= nqu;
 775     if (!qu) return 0;
 776     if (qu->next) {
 777       nqu= qu->next;
 778     } else if (qu == ads->udpw.tail) {
 779       nqu=
 780         ads->tcpw.head ? ads->tcpw.head :
 781         ads->childw.head ? ads->childw.head :
 782         ads->output.head;
 783     } else if (qu == ads->tcpw.tail) {
 784       nqu=
 785         ads->childw.head ? ads->childw.head :
 786         ads->output.head;
 787     } else if (qu == ads->childw.tail) {
 788       nqu= ads->output.head;
 789     } else {
 790       nqu= 0;
 791     }
 792     if (!qu->parent) break;
 793   }
 794   ads->forallnext= nqu;
 795   if (context_r) *context_r= qu->ctx.ext;
 796   return qu;
 797 }