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     if (l>=8 && !memcmp(word,"adns_af:",8)) {
 314       if (!strcmp(word+8,"v4only"))
 315         ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v4only;
 316       else if (!strcmp(word+8,"v6only"))
 317         ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v6only;
 318       else if (!strcmp(word+8,"any"))
 319         ads->iflags = (ads->iflags & ~adns_if_afmask);
 320       else {
 321         configparseerr(ads,fn,lno, "option adns_af has bad value `%s' "
 322                        "(must be any, v4only or v6only", word+8);
 323       }
 324       continue;
 325     }
 326     adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
 327   }
 328 }
 329
 330 static void ccf_clearnss(adns_state ads, const char *fn,
 331                          int lno, const char *buf) {
 332   ads->nservers= 0;
 333 }
 334
 335 static void ccf_include(adns_state ads, const char *fn,
 336                         int lno, const char *buf) {
 337   if (!*buf) {
 338     configparseerr(ads,fn,lno,"`include' directive with no filename");
 339     return;
 340   }
 341   readconfig(ads,buf,1);
 342 }
 343
 344 static void ccf_lookup(adns_state ads, const char *fn, int lno,
 345                        const char *buf) {
 346   int found_bind=0;
 347   const char *word;
 348   int l;
 349
 350   if (!*buf) {
 351     configparseerr(ads,fn,lno,"`lookup' directive with no databases");
 352     return;
 353   }
 354
 355   while (nextword(&buf,&word,&l)) {
 356     if (l==4 && !memcmp(word,"bind",4)) {
 357       found_bind=1;
 358     } else if (l==4 && !memcmp(word,"file",4)) {
 359       /* ignore this and hope /etc/hosts is not essential */
 360     } else if (l==2 && !memcmp(word,"yp",2)) {
 361       adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
 362       found_bind=-1;
 363     } else {
 364       adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
 365                  fn,lno, l,word);
 366       found_bind=-1;
 367     }
 368   }
 369   if (!found_bind)
 370     adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
 371 }
 372
 373 static const struct configcommandinfo {
 374   const char *name;
 375   void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
 376 } configcommandinfos[]= {
 377   { "nameserver",        ccf_nameserver  },
 378   { "domain",            ccf_search      },
 379   { "search",            ccf_search      },
 380   { "sortlist",          ccf_sortlist    },
 381   { "options",           ccf_options     },
 382   { "clearnameservers",  ccf_clearnss    },
 383   { "include",           ccf_include     },
 384   { "lookup",            ccf_lookup      }, /* OpenBSD */
 385   {  0                                   }
 386 };
 387
 388 typedef union {
 389   FILE *file;
 390   const char *text;
 391 } getline_ctx;
 392
 393 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
 394                    int lno, char *buf, int buflen) {
 395   FILE *file= src_io->file;
 396   int c, i;
 397   char *p;
 398
 399   p= buf;
 400   buflen--;
 401   i= 0;
 402
 403   for (;;) { /* loop over chars */
 404     if (i == buflen) {
 405       adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 406       goto x_badline;
 407     }
 408     c= getc(file);
 409     if (!c) {
 410       adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
 411       goto x_badline;
 412     } else if (c == '\n') {
 413       break;
 414     } else if (c == EOF) {
 415       if (ferror(file)) {
 416         saveerr(ads,errno);
 417         adns__diag(ads,-1,0,"%s:%d: read error: %s",
 418                    filename,lno,strerror(errno));
 419         return -1;
 420       }
 421       if (!i) return -1;
 422       break;
 423     } else {
 424       *p++= c;
 425       i++;
 426     }
 427   }
 428
 429   *p++= 0;
 430   return i;
 431
 432  x_badline:
 433   saveerr(ads,EINVAL);
 434   while ((c= getc(file)) != EOF && c != '\n');
 435   return -2;
 436 }
 437
 438 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
 439                    int lno, char *buf, int buflen) {
 440   const char *cp= src_io->text;
 441   int l;
 442
 443   if (!cp || !*cp) return -1;
 444
 445   if (*cp == ';' || *cp == '\n') cp++;
 446   l= strcspn(cp,";\n");
 447   src_io->text = cp+l;
 448
 449   if (l >= buflen) {
 450     adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 451     saveerr(ads,EINVAL);
 452     return -2;
 453   }
 454
 455   memcpy(buf,cp,l);
 456   buf[l]= 0;
 457   return l;
 458 }
 459
 460 static void readconfiggeneric(adns_state ads, const char *filename,
 461                               int (*getline)(adns_state ads, getline_ctx*,
 462                                              const char *filename, int lno,
 463                                              char *buf, int buflen),
 464                               /* Returns >=0 for success, -1 for EOF or error
 465                                * (error will have been reported), or -2 for
 466                                * bad line was encountered, try again.
 467                                */
 468                               getline_ctx gl_ctx) {
 469   char linebuf[2000], *p, *q;
 470   int lno, l, dirl;
 471   const struct configcommandinfo *ccip;
 472
 473   for (lno=1;
 474        (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
 475        lno++) {
 476     if (l == -2) continue;
 477     while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
 478     linebuf[l]= 0;
 479     p= linebuf;
 480     while (ctype_whitespace(*p)) p++;
 481     if (*p == '#' || *p == ';' || !*p) continue;
 482     q= p;
 483     while (*q && !ctype_whitespace(*q)) q++;
 484     dirl= q-p;
 485     for (ccip=configcommandinfos;
 486          ccip->name &&
 487            !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
 488          ccip++);
 489     if (!ccip->name) {
 490       adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
 491                  filename,lno,(int)(q-p),p);
 492       continue;
 493     }
 494     while (ctype_whitespace(*q)) q++;
 495     ccip->fn(ads,filename,lno,q);
 496   }
 497 }
 498
 499 static const char *instrum_getenv(adns_state ads, const char *envvar) {
 500   const char *value;
 501
 502   value= getenv(envvar);
 503   if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
 504   else adns__debug(ads,-1,0,"environment variable %s"
 505                    " set to `%s'",envvar,value);
 506   return value;
 507 }
 508
 509 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
 510   getline_ctx gl_ctx;
 511
 512   gl_ctx.file= fopen(filename,"r");
 513   if (!gl_ctx.file) {
 514     if (errno == ENOENT) {
 515       if (warnmissing)
 516         adns__debug(ads,-1,0, "configuration file"
 517                     " `%s' does not exist",filename);
 518       return;
 519     }
 520     saveerr(ads,errno);
 521     adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
 522                filename,strerror(errno));
 523     return;
 524   }
 525
 526   readconfiggeneric(ads,filename,gl_file,gl_ctx);
 527
 528   fclose(gl_ctx.file);
 529 }
 530
 531 static void readconfigtext(adns_state ads, const char *text,
 532                            const char *showname) {
 533   getline_ctx gl_ctx;
 534
 535   gl_ctx.text= text;
 536   readconfiggeneric(ads,showname,gl_text,gl_ctx);
 537 }
 538
 539 static void readconfigenv(adns_state ads, const char *envvar) {
 540   const char *filename;
 541
 542   if (ads->iflags & adns_if_noenv) {
 543     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 544     return;
 545   }
 546   filename= instrum_getenv(ads,envvar);
 547   if (filename) readconfig(ads,filename,1);
 548 }
 549
 550 static void readconfigenvtext(adns_state ads, const char *envvar) {
 551   const char *textdata;
 552
 553   if (ads->iflags & adns_if_noenv) {
 554     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 555     return;
 556   }
 557   textdata= instrum_getenv(ads,envvar);
 558   if (textdata) readconfigtext(ads,textdata,envvar);
 559 }
 560
 561
 562 int adns__setnonblock(adns_state ads, int fd) {
 563   int r;
 564
 565   r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
 566   r |= O_NONBLOCK;
 567   r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
 568   return 0;
 569 }
 570
 571 static int init_begin(adns_state *ads_r, adns_initflags flags,
 572                       adns_logcallbackfn *logfn, void *logfndata) {
 573   adns_state ads;
 574   pid_t pid;
 575
 576   ads= malloc(sizeof(*ads)); if (!ads) return errno;
 577
 578   ads->iflags= flags;
 579   ads->logfn= logfn;
 580   ads->logfndata= logfndata;
 581   ads->configerrno= 0;
 582   LIST_INIT(ads->udpw);
 583   LIST_INIT(ads->tcpw);
 584   LIST_INIT(ads->childw);
 585   LIST_INIT(ads->output);
 586   ads->forallnext= 0;
 587   ads->nextid= 0x311f;
 588   ads->nudp= 0;
 589   ads->tcpsocket= -1;
 590   adns__vbuf_init(&ads->tcpsend);
 591   adns__vbuf_init(&ads->tcprecv);
 592   ads->tcprecv_skip= 0;
 593   ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
 594   ads->searchndots= 1;
 595   ads->tcpstate= server_disconnected;
 596   timerclear(&ads->tcptimeout);
 597   ads->searchlist= 0;
 598
 599   pid= getpid();
 600   ads->rand48xsubi[0]= pid;
 601   ads->rand48xsubi[1]= (unsigned long)pid >> 16;
 602   ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
 603
 604   *ads_r= ads;
 605   return 0;
 606 }
 607
 608 static int init_finish(adns_state ads) {
 609   struct sockaddr_in sin;
 610   struct protoent *proto;
 611   struct udpsocket *udp;
 612   int i, j;
 613   int r;
 614
 615   if (!ads->nservers) {
 616     if (ads->logfn && ads->iflags & adns_if_debug)
 617       adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
 618     memset(&sin, 0, sizeof(sin));
 619     sin.sin_port = htons(DNS_PORT);
 620     sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 621     addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
 622   }
 623
 624   proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
 625   ads->nudp = 0;
 626   for (i = 0; i < ads->nservers; i++) {
 627     for (j = 0; j < ads->nudp; j++) {
 628       if (ads->udpsocket[j].ai->af == ads->servers[i].addr.sa.sa_family)
 629         goto afmatch;
 630     }
 631
 632     assert(ads->nudp < MAXUDP);
 633     udp = &ads->udpsocket[ads->nudp];
 634     udp->ai = find_afinfo(ads->servers[i].addr.sa.sa_family);
 635     assert(udp->ai);
 636     udp->fd = socket(udp->ai->af,SOCK_DGRAM,proto->p_proto);
 637     if (udp->fd < 0) { r= errno; goto x_free; }
 638     r= adns__setnonblock(ads,udp->fd);
 639     if (r) { r= errno; goto x_closeudp; }
 640     ads->nudp++;
 641
 642   afmatch:;
 643   }
 644
 645   return 0;
 646
 647  x_closeudp:
 648   for (j = 0; j < ads->nudp; j++) close(ads->udpsocket[j].fd);
 649  x_free:
 650   free(ads);
 651   return r;
 652 }
 653
 654 static void init_abort(adns_state ads) {
 655   if (ads->nsearchlist) {
 656     free(ads->searchlist[0]);
 657     free(ads->searchlist);
 658   }
 659   free(ads);
 660 }
 661
 662 static void logfn_file(adns_state ads, void *logfndata,
 663                        const char *fmt, va_list al) {
 664   vfprintf(logfndata,fmt,al);
 665 }
 666
 667 static int init_files(adns_state *ads_r, adns_initflags flags,
 668                       adns_logcallbackfn *logfn, void *logfndata) {
 669   adns_state ads;
 670   const char *res_options, *adns_res_options;
 671   int r;
 672
 673   r= init_begin(&ads, flags, logfn, logfndata);
 674   if (r) return r;
 675
 676   res_options= instrum_getenv(ads,"RES_OPTIONS");
 677   adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
 678   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 679   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 680
 681   readconfig(ads,"/etc/resolv.conf",1);
 682   readconfig(ads,"/etc/resolv-adns.conf",0);
 683   readconfigenv(ads,"RES_CONF");
 684   readconfigenv(ads,"ADNS_RES_CONF");
 685
 686   readconfigenvtext(ads,"RES_CONF_TEXT");
 687   readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
 688
 689   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 690   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 691
 692   ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
 693   ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
 694
 695   if (ads->configerrno && ads->configerrno != EINVAL) {
 696     r= ads->configerrno;
 697     init_abort(ads);
 698     return r;
 699   }
 700
 701   r= init_finish(ads);
 702   if (r) return r;
 703
 704   adns__consistency(ads,0,cc_entex);
 705   *ads_r= ads;
 706   return 0;
 707 }
 708
 709 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
 710   return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
 711 }
 712
 713 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
 714                        adns_logcallbackfn *logfn, void *logfndata,
 715                        const char *configtext) {
 716   adns_state ads;
 717   int r;
 718
 719   r= init_begin(&ads, flags, logfn, logfndata);
 720   if (r) return r;
 721
 722   readconfigtext(ads,configtext,"<supplied configuration text>");
 723   if (ads->configerrno) {
 724     r= ads->configerrno;
 725     init_abort(ads);
 726     return r;
 727   }
 728
 729   r= init_finish(ads);  if (r) return r;
 730   adns__consistency(ads,0,cc_entex);
 731   *ads_r= ads;
 732   return 0;
 733 }
 734
 735 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
 736                      FILE *diagfile, const char *configtext) {
 737   return init_strcfg(ads_r, flags,
 738                      diagfile ? logfn_file : 0, diagfile,
 739                      configtext);
 740 }
 741
 742 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
 743                     const char *configtext /*0=>use default config files*/,
 744                     adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
 745                     void *logfndata /*0 with logfn==0 => discard*/) {
 746   if (!logfn && logfndata)
 747     logfn= logfn_file;
 748   if (configtext)
 749     return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
 750   else
 751     return init_files(newstate_r, flags, logfn, logfndata);
 752 }
 753
 754 void adns_finish(adns_state ads) {
 755   int i;
 756   adns__consistency(ads,0,cc_entex);
 757   for (;;) {
 758     if (ads->udpw.head) adns_cancel(ads->udpw.head);
 759     else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
 760     else if (ads->childw.head) adns_cancel(ads->childw.head);
 761     else if (ads->output.head) adns_cancel(ads->output.head);
 762     else break;
 763   }
 764   for (i = 0; i < ads->nudp; i++) close(ads->udpsocket[i].fd);
 765   if (ads->tcpsocket >= 0) close(ads->tcpsocket);
 766   adns__vbuf_free(&ads->tcpsend);
 767   adns__vbuf_free(&ads->tcprecv);
 768   freesearchlist(ads);
 769   free(ads);
 770 }
 771
 772 void adns_forallqueries_begin(adns_state ads) {
 773   adns__consistency(ads,0,cc_entex);
 774   ads->forallnext=
 775     ads->udpw.head ? ads->udpw.head :
 776     ads->tcpw.head ? ads->tcpw.head :
 777     ads->childw.head ? ads->childw.head :
 778     ads->output.head;
 779 }
 780
 781 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
 782   adns_query qu, nqu;
 783
 784   adns__consistency(ads,0,cc_entex);
 785   nqu= ads->forallnext;
 786   for (;;) {
 787     qu= nqu;
 788     if (!qu) return 0;
 789     if (qu->next) {
 790       nqu= qu->next;
 791     } else if (qu == ads->udpw.tail) {
 792       nqu=
 793         ads->tcpw.head ? ads->tcpw.head :
 794         ads->childw.head ? ads->childw.head :
 795         ads->output.head;
 796     } else if (qu == ads->tcpw.tail) {
 797       nqu=
 798         ads->childw.head ? ads->childw.head :
 799         ads->output.head;
 800     } else if (qu == ads->childw.tail) {
 801       nqu= ads->output.head;
 802     } else {
 803       nqu= 0;
 804     }
 805     if (!qu->parent) break;
 806   }
 807   ads->forallnext= nqu;
 808   if (context_r) *context_r= qu->ctx.ext;
 809   return qu;
 810 }