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 void addserver(adns_state ads, struct in_addr addr) {
  45   int i;
  46   struct server *ss;
  47
  48   for (i=0; i<ads->nservers; i++) {
  49     if (ads->servers[i].addr.s_addr == addr.s_addr) {
  50       adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
  51       return;
  52     }
  53   }
  54
  55   if (ads->nservers>=MAXSERVERS) {
  56     adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
  57     return;
  58   }
  59
  60   ss= ads->servers+ads->nservers;
  61   ss->addr= addr;
  62   ads->nservers++;
  63 }
  64
  65 static void freesearchlist(adns_state ads) {
  66   if (ads->nsearchlist) free(*ads->searchlist);
  67   free(ads->searchlist);
  68 }
  69
  70 static void saveerr(adns_state ads, int en) {
  71   if (!ads->configerrno) ads->configerrno= en;
  72 }
  73
  74 static void configparseerr(adns_state ads, const char *fn, int lno,
  75                            const char *fmt, ...) {
  76   va_list al;
  77
  78   saveerr(ads,EINVAL);
  79   if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
  80
  81   if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
  82   else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
  83   va_start(al,fmt);
  84   adns__vlprintf(ads,fmt,al);
  85   va_end(al);
  86   adns__lprintf(ads,"\n");
  87 }
  88
  89 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
  90   const char *p, *q;
  91
  92   p= *bufp_io;
  93   while (ctype_whitespace(*p)) p++;
  94   if (!*p) return 0;
  95
  96   q= p;
  97   while (*q && !ctype_whitespace(*q)) q++;
  98
  99   *l_r= q-p;
 100   *word_r= p;
 101   *bufp_io= q;
 102
 103   return 1;
 104 }
 105
 106 static void ccf_nameserver(adns_state ads, const char *fn,
 107                            int lno, const char *buf) {
 108   struct in_addr ia;
 109
 110   if (!inet_aton(buf,&ia)) {
 111     configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
 112     return;
 113   }
 114   adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
 115   addserver(ads,ia);
 116 }
 117
 118 static void ccf_search(adns_state ads, const char *fn,
 119                        int lno, const char *buf) {
 120   const char *bufp, *word;
 121   char *newchars, **newptrs, **pp;
 122   int count, tl, l;
 123
 124   if (!buf) return;
 125
 126   bufp= buf;
 127   count= 0;
 128   tl= 0;
 129   while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
 130
 131   newptrs= malloc(sizeof(char*)*count);
 132   if (!newptrs) { saveerr(ads,errno); return; }
 133
 134   newchars= malloc(tl);
 135   if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
 136
 137   bufp= buf;
 138   pp= newptrs;
 139   while (nextword(&bufp,&word,&l)) {
 140     *pp++= newchars;
 141     memcpy(newchars,word,l);
 142     newchars += l;
 143     *newchars++ = 0;
 144   }
 145
 146   freesearchlist(ads);
 147   ads->nsearchlist= count;
 148   ads->searchlist= newptrs;
 149 }
 150
 151 static void ccf_sortlist(adns_state ads, const char *fn,
 152                          int lno, const char *buf) {
 153   const char *word;
 154   char tbuf[200], *slash, *ep;
 155   const char *maskwhat;
 156   struct in_addr base, mask;
 157   int l;
 158   unsigned long initial, baselocal;
 159
 160   if (!buf) return;
 161
 162   ads->nsortlist= 0;
 163   while (nextword(&buf,&word,&l)) {
 164     if (ads->nsortlist >= MAXSORTLIST) {
 165       adns__diag(ads,-1,0,"too many sortlist entries,"
 166                  " ignoring %.*s onwards",l,word);
 167       return;
 168     }
 169
 170     if (l >= sizeof(tbuf)) {
 171       configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
 172       continue;
 173     }
 174
 175     memcpy(tbuf,word,l); tbuf[l]= 0;
 176     slash= strchr(tbuf,'/');
 177     if (slash) *slash++= 0;
 178
 179     if (!inet_aton(tbuf,&base)) {
 180       configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
 181       continue;
 182     }
 183
 184     if (slash) {
 185       if (strchr(slash,'.')) {
 186         maskwhat = "mask";
 187         if (!inet_aton(slash,&mask)) {
 188           configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
 189           continue;
 190         }
 191       } else {
 192         maskwhat = "prefix length";
 193         initial= strtoul(slash,&ep,10);
 194         if (*ep || initial>32) {
 195           configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
 196           continue;
 197         }
 198         mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
 199       }
 200     } else {
 201       maskwhat = "implied mask";
 202       baselocal= ntohl(base.s_addr);
 203       if (!(baselocal & 0x080000000UL)) /* class A */
 204         mask.s_addr= htonl(0x0ff000000UL);
 205       else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
 206         mask.s_addr= htonl(0x0ffff0000UL); /* class B */
 207       else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
 208         mask.s_addr= htonl(0x0ff000000UL); /* class C */
 209       else {
 210         configparseerr(ads,fn,lno, "network address `%s'"
 211                        " in sortlist is not in classed ranges,"
 212                        " must specify mask explicitly", tbuf);
 213         continue;
 214       }
 215     }
 216
 217     if (base.s_addr & ~mask.s_addr) {
 218       configparseerr(ads,fn,lno, "%s `%s' in sortlist"
 219                      " overlaps address `%s'",maskwhat,
 220                      slash ? slash : inet_ntoa(mask), tbuf);
 221       continue;
 222     }
 223
 224     ads->sortlist[ads->nsortlist].base= base;
 225     ads->sortlist[ads->nsortlist].mask= mask;
 226     ads->nsortlist++;
 227   }
 228 }
 229
 230 static void ccf_options(adns_state ads, const char *fn,
 231                         int lno, const char *buf) {
 232   const char *word;
 233   char *ep;
 234   unsigned long v;
 235   int l;
 236
 237   if (!buf) return;
 238
 239   while (nextword(&buf,&word,&l)) {
 240     if (l==5 && !memcmp(word,"debug",5)) {
 241       ads->iflags |= adns_if_debug;
 242       continue;
 243     }
 244     if (l>=6 && !memcmp(word,"ndots:",6)) {
 245       v= strtoul(word+6,&ep,10);
 246       if (l==6 || ep != word+l || v > INT_MAX) {
 247         configparseerr(ads,fn,lno,"option `%.*s' malformed"
 248                        " or has bad value",l,word);
 249         continue;
 250       }
 251       ads->searchndots= v;
 252       continue;
 253     }
 254     if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
 255       if (!strcmp(word+12,"none")) {
 256         ads->iflags &= ~adns_if_checkc_freq;
 257         ads->iflags |= adns_if_checkc_entex;
 258       } else if (!strcmp(word+12,"entex")) {
 259         ads->iflags &= ~adns_if_checkc_freq;
 260         ads->iflags |= adns_if_checkc_entex;
 261       } else if (!strcmp(word+12,"freq")) {
 262         ads->iflags |= adns_if_checkc_freq;
 263       } else {
 264         configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
 265                        "(must be none, entex or freq", word+12);
 266       }
 267       continue;
 268     }
 269     adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
 270   }
 271 }
 272
 273 static void ccf_clearnss(adns_state ads, const char *fn,
 274                          int lno, const char *buf) {
 275   ads->nservers= 0;
 276 }
 277
 278 static void ccf_include(adns_state ads, const char *fn,
 279                         int lno, const char *buf) {
 280   if (!*buf) {
 281     configparseerr(ads,fn,lno,"`include' directive with no filename");
 282     return;
 283   }
 284   readconfig(ads,buf,1);
 285 }
 286
 287 static void ccf_lookup(adns_state ads, const char *fn, int lno,
 288                        const char *buf) {
 289   int found_bind=0;
 290   const char *word;
 291   int l;
 292
 293   if (!*buf) {
 294     configparseerr(ads,fn,lno,"`lookup' directive with no databases");
 295     return;
 296   }
 297
 298   while (nextword(&buf,&word,&l)) {
 299     if (l==4 && !memcmp(word,"bind",4)) {
 300       found_bind=1;
 301     } else if (l==4 && !memcmp(word,"file",4)) {
 302       /* ignore this and hope /etc/hosts is not essential */
 303     } else if (l==2 && !memcmp(word,"yp",2)) {
 304       adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
 305       found_bind=-1;
 306     } else {
 307       adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
 308                  fn,lno, l,word);
 309       found_bind=-1;
 310     }
 311   }
 312   if (!found_bind)
 313     adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
 314 }
 315
 316 static const struct configcommandinfo {
 317   const char *name;
 318   void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
 319 } configcommandinfos[]= {
 320   { "nameserver",        ccf_nameserver  },
 321   { "domain",            ccf_search      },
 322   { "search",            ccf_search      },
 323   { "sortlist",          ccf_sortlist    },
 324   { "options",           ccf_options     },
 325   { "clearnameservers",  ccf_clearnss    },
 326   { "include",           ccf_include     },
 327   { "lookup",            ccf_lookup      }, /* OpenBSD */
 328   {  0                                   }
 329 };
 330
 331 typedef union {
 332   FILE *file;
 333   const char *text;
 334 } getline_ctx;
 335
 336 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
 337                    int lno, char *buf, int buflen) {
 338   FILE *file= src_io->file;
 339   int c, i;
 340   char *p;
 341
 342   p= buf;
 343   buflen--;
 344   i= 0;
 345
 346   for (;;) { /* loop over chars */
 347     if (i == buflen) {
 348       adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 349       goto x_badline;
 350     }
 351     c= getc(file);
 352     if (!c) {
 353       adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
 354       goto x_badline;
 355     } else if (c == '\n') {
 356       break;
 357     } else if (c == EOF) {
 358       if (ferror(file)) {
 359         saveerr(ads,errno);
 360         adns__diag(ads,-1,0,"%s:%d: read error: %s",
 361                    filename,lno,strerror(errno));
 362         return -1;
 363       }
 364       if (!i) return -1;
 365       break;
 366     } else {
 367       *p++= c;
 368       i++;
 369     }
 370   }
 371
 372   *p++= 0;
 373   return i;
 374
 375  x_badline:
 376   saveerr(ads,EINVAL);
 377   while ((c= getc(file)) != EOF && c != '\n');
 378   return -2;
 379 }
 380
 381 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
 382                    int lno, char *buf, int buflen) {
 383   const char *cp= src_io->text;
 384   int l;
 385
 386   if (!cp || !*cp) return -1;
 387
 388   if (*cp == ';' || *cp == '\n') cp++;
 389   l= strcspn(cp,";\n");
 390   src_io->text = cp+l;
 391
 392   if (l >= buflen) {
 393     adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
 394     saveerr(ads,EINVAL);
 395     return -2;
 396   }
 397
 398   memcpy(buf,cp,l);
 399   buf[l]= 0;
 400   return l;
 401 }
 402
 403 static void readconfiggeneric(adns_state ads, const char *filename,
 404                               int (*getline)(adns_state ads, getline_ctx*,
 405                                              const char *filename, int lno,
 406                                              char *buf, int buflen),
 407                               /* Returns >=0 for success, -1 for EOF or error
 408                                * (error will have been reported), or -2 for
 409                                * bad line was encountered, try again.
 410                                */
 411                               getline_ctx gl_ctx) {
 412   char linebuf[2000], *p, *q;
 413   int lno, l, dirl;
 414   const struct configcommandinfo *ccip;
 415
 416   for (lno=1;
 417        (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
 418        lno++) {
 419     if (l == -2) continue;
 420     while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
 421     linebuf[l]= 0;
 422     p= linebuf;
 423     while (ctype_whitespace(*p)) p++;
 424     if (*p == '#' || *p == ';' || !*p) continue;
 425     q= p;
 426     while (*q && !ctype_whitespace(*q)) q++;
 427     dirl= q-p;
 428     for (ccip=configcommandinfos;
 429          ccip->name &&
 430            !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
 431          ccip++);
 432     if (!ccip->name) {
 433       adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
 434                  filename,lno,(int)(q-p),p);
 435       continue;
 436     }
 437     while (ctype_whitespace(*q)) q++;
 438     ccip->fn(ads,filename,lno,q);
 439   }
 440 }
 441
 442 static const char *instrum_getenv(adns_state ads, const char *envvar) {
 443   const char *value;
 444
 445   value= getenv(envvar);
 446   if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
 447   else adns__debug(ads,-1,0,"environment variable %s"
 448                    " set to `%s'",envvar,value);
 449   return value;
 450 }
 451
 452 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
 453   getline_ctx gl_ctx;
 454
 455   gl_ctx.file= fopen(filename,"r");
 456   if (!gl_ctx.file) {
 457     if (errno == ENOENT) {
 458       if (warnmissing)
 459         adns__debug(ads,-1,0, "configuration file"
 460                     " `%s' does not exist",filename);
 461       return;
 462     }
 463     saveerr(ads,errno);
 464     adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
 465                filename,strerror(errno));
 466     return;
 467   }
 468
 469   readconfiggeneric(ads,filename,gl_file,gl_ctx);
 470
 471   fclose(gl_ctx.file);
 472 }
 473
 474 static void readconfigtext(adns_state ads, const char *text,
 475                            const char *showname) {
 476   getline_ctx gl_ctx;
 477
 478   gl_ctx.text= text;
 479   readconfiggeneric(ads,showname,gl_text,gl_ctx);
 480 }
 481
 482 static void readconfigenv(adns_state ads, const char *envvar) {
 483   const char *filename;
 484
 485   if (ads->iflags & adns_if_noenv) {
 486     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 487     return;
 488   }
 489   filename= instrum_getenv(ads,envvar);
 490   if (filename) readconfig(ads,filename,1);
 491 }
 492
 493 static void readconfigenvtext(adns_state ads, const char *envvar) {
 494   const char *textdata;
 495
 496   if (ads->iflags & adns_if_noenv) {
 497     adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
 498     return;
 499   }
 500   textdata= instrum_getenv(ads,envvar);
 501   if (textdata) readconfigtext(ads,textdata,envvar);
 502 }
 503
 504
 505 int adns__setnonblock(adns_state ads, int fd) {
 506   int r;
 507
 508   r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
 509   r |= O_NONBLOCK;
 510   r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
 511   return 0;
 512 }
 513
 514 static int init_begin(adns_state *ads_r, adns_initflags flags,
 515                       adns_logcallbackfn *logfn, void *logfndata) {
 516   adns_state ads;
 517   pid_t pid;
 518
 519   ads= malloc(sizeof(*ads)); if (!ads) return errno;
 520
 521   ads->iflags= flags;
 522   ads->logfn= logfn;
 523   ads->logfndata= logfndata;
 524   ads->configerrno= 0;
 525   LIST_INIT(ads->udpw);
 526   LIST_INIT(ads->tcpw);
 527   LIST_INIT(ads->childw);
 528   LIST_INIT(ads->output);
 529   ads->forallnext= 0;
 530   ads->nextid= 0x311f;
 531   ads->udpsocket= ads->tcpsocket= -1;
 532   adns__vbuf_init(&ads->tcpsend);
 533   adns__vbuf_init(&ads->tcprecv);
 534   ads->tcprecv_skip= 0;
 535   ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
 536   ads->searchndots= 1;
 537   ads->tcpstate= server_disconnected;
 538   timerclear(&ads->tcptimeout);
 539   ads->searchlist= 0;
 540
 541   pid= getpid();
 542   ads->rand48xsubi[0]= pid;
 543   ads->rand48xsubi[1]= (unsigned long)pid >> 16;
 544   ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
 545
 546   *ads_r= ads;
 547   return 0;
 548 }
 549
 550 static int init_finish(adns_state ads) {
 551   struct in_addr ia;
 552   struct protoent *proto;
 553   int r;
 554
 555   if (!ads->nservers) {
 556     if (ads->logfn && ads->iflags & adns_if_debug)
 557       adns__lprintf(ads,"adns: no nameservers, using localhost\n");
 558     ia.s_addr= htonl(INADDR_LOOPBACK);
 559     addserver(ads,ia);
 560   }
 561
 562   proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
 563   ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
 564   if (ads->udpsocket<0) { r= errno; goto x_free; }
 565
 566   r= adns__setnonblock(ads,ads->udpsocket);
 567   if (r) { r= errno; goto x_closeudp; }
 568
 569   return 0;
 570
 571  x_closeudp:
 572   close(ads->udpsocket);
 573  x_free:
 574   free(ads);
 575   return r;
 576 }
 577
 578 static void init_abort(adns_state ads) {
 579   if (ads->nsearchlist) {
 580     free(ads->searchlist[0]);
 581     free(ads->searchlist);
 582   }
 583   free(ads);
 584 }
 585
 586 static void logfn_file(adns_state ads, void *logfndata,
 587                        const char *fmt, va_list al) {
 588   vfprintf(logfndata,fmt,al);
 589 }
 590
 591 static int init_files(adns_state *ads_r, adns_initflags flags,
 592                       adns_logcallbackfn *logfn, void *logfndata) {
 593   adns_state ads;
 594   const char *res_options, *adns_res_options;
 595   int r;
 596
 597   r= init_begin(&ads, flags, logfn, logfndata);
 598   if (r) return r;
 599
 600   res_options= instrum_getenv(ads,"RES_OPTIONS");
 601   adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
 602   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 603   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 604
 605   readconfig(ads,"/etc/resolv.conf",1);
 606   readconfig(ads,"/etc/resolv-adns.conf",0);
 607   readconfigenv(ads,"RES_CONF");
 608   readconfigenv(ads,"ADNS_RES_CONF");
 609
 610   readconfigenvtext(ads,"RES_CONF_TEXT");
 611   readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
 612
 613   ccf_options(ads,"RES_OPTIONS",-1,res_options);
 614   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 615
 616   ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
 617   ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
 618
 619   if (ads->configerrno && ads->configerrno != EINVAL) {
 620     r= ads->configerrno;
 621     init_abort(ads);
 622     return r;
 623   }
 624
 625   r= init_finish(ads);
 626   if (r) return r;
 627
 628   adns__consistency(ads,0,cc_entex);
 629   *ads_r= ads;
 630   return 0;
 631 }
 632
 633 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
 634   return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
 635 }
 636
 637 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
 638                        adns_logcallbackfn *logfn, void *logfndata,
 639                        const char *configtext) {
 640   adns_state ads;
 641   int r;
 642
 643   r= init_begin(&ads, flags, logfn, logfndata);
 644   if (r) return r;
 645
 646   readconfigtext(ads,configtext,"<supplied configuration text>");
 647   if (ads->configerrno) {
 648     r= ads->configerrno;
 649     init_abort(ads);
 650     return r;
 651   }
 652
 653   r= init_finish(ads);  if (r) return r;
 654   adns__consistency(ads,0,cc_entex);
 655   *ads_r= ads;
 656   return 0;
 657 }
 658
 659 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
 660                      FILE *diagfile, const char *configtext) {
 661   return init_strcfg(ads_r, flags,
 662                      diagfile ? logfn_file : 0, diagfile,
 663                      configtext);
 664 }
 665
 666 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
 667                     const char *configtext /*0=>use default config files*/,
 668                     adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
 669                     void *logfndata /*0 with logfn==0 => discard*/) {
 670   if (!logfn && logfndata)
 671     logfn= logfn_file;
 672   if (configtext)
 673     return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
 674   else
 675     return init_files(newstate_r, flags, logfn, logfndata);
 676 }
 677
 678 void adns_finish(adns_state ads) {
 679   adns__consistency(ads,0,cc_entex);
 680   for (;;) {
 681     if (ads->udpw.head) adns_cancel(ads->udpw.head);
 682     else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
 683     else if (ads->childw.head) adns_cancel(ads->childw.head);
 684     else if (ads->output.head) adns_cancel(ads->output.head);
 685     else break;
 686   }
 687   close(ads->udpsocket);
 688   if (ads->tcpsocket >= 0) close(ads->tcpsocket);
 689   adns__vbuf_free(&ads->tcpsend);
 690   adns__vbuf_free(&ads->tcprecv);
 691   freesearchlist(ads);
 692   free(ads);
 693 }
 694
 695 void adns_forallqueries_begin(adns_state ads) {
 696   adns__consistency(ads,0,cc_entex);
 697   ads->forallnext=
 698     ads->udpw.head ? ads->udpw.head :
 699     ads->tcpw.head ? ads->tcpw.head :
 700     ads->childw.head ? ads->childw.head :
 701     ads->output.head;
 702 }
 703
 704 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
 705   adns_query qu, nqu;
 706
 707   adns__consistency(ads,0,cc_entex);
 708   nqu= ads->forallnext;
 709   for (;;) {
 710     qu= nqu;
 711     if (!qu) return 0;
 712     if (qu->next) {
 713       nqu= qu->next;
 714     } else if (qu == ads->udpw.tail) {
 715       nqu=
 716         ads->tcpw.head ? ads->tcpw.head :
 717         ads->childw.head ? ads->childw.head :
 718         ads->output.head;
 719     } else if (qu == ads->tcpw.tail) {
 720       nqu=
 721         ads->childw.head ? ads->childw.head :
 722         ads->output.head;
 723     } else if (qu == ads->childw.tail) {
 724       nqu= ads->output.head;
 725     } else {
 726       nqu= 0;
 727     }
 728     if (!qu->parent) break;
 729   }
 730   ads->forallnext= nqu;
 731   if (context_r) *context_r= qu->ctx.ext;
 732   return qu;
 733 }