X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fsetup.c;h=c52966d22547089cd9226fa080a391b537734625;hp=8939ac63f0cc19bf997f441174806af39f86d96f;hb=1711fa2cb495c1ea6a1301fd6383139e7fcf0e45;hpb=37e28fde2d1d358ca0b887fc131f0ca108318b2a

diff --git a/src/setup.c b/src/setup.c
index 8939ac6..c52966d 100644
--- a/src/setup.c
+++ b/src/setup.c
@@ -1,108 +1,402 @@
-/**/
-
-#include "adns-internal.h"
-
-void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
-			int serv, const char *fmt, va_list al) {
-  if (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent))) return;
-  if (serv>=0) {
-    fprintf(stderr,"adns%s: nameserver %s: ",pfx,inet_ntoa(ads->servers[serv].addr));
-  } else {
-    fprintf(stderr,"adns%s: ",pfx);
-  }
-  vfprintf(stderr,fmt,al);
-  fputc('\n',stderr);
-}
-
-void adns__debug(adns_state ads, int serv, const char *fmt, ...) {
-  va_list al;
-
-  va_start(al,fmt);
-  vdiag(ads," debug",0,serv,fmt,al);
-  va_end(al);
-}
-
-void adns__swarn(adns_state ads, int serv, const char *fmt, ...) {
-  va_list al;
-
-  va_start(al,fmt);
-  vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,fmt,al);
-  va_end(al);
-}
-
-void adns__diag(adns_state ads, int serv, const char *fmt, ...) {
-  va_list al;
-
-  va_start(al,fmt);
-  vdiag(ads,"",adns_if_noerrprint,serv,fmt,al);
-  va_end(al);
-}
-
-static void addserver(adns_state ads, struct in_addr addr) {
+/*
+ * setup.c
+ * - configuration file parsing
+ * - management of global state
+ */
+/*
+ *  This file is part of adns, which is
+ *    Copyright (C) 1997-2000,2003,2006,2014  Ian Jackson
+ *    Copyright (C) 2014  Mark Wooding
+ *    Copyright (C) 1999-2000,2003,2006  Tony Finch
+ *    Copyright (C) 1991 Massachusetts Institute of Technology
+ *  (See the file INSTALL for full details.)
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3, or (at your option)
+ *  any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software Foundation.
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <sys/types.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "internal.h"
+
+static void readconfig(adns_state ads, const char *filename, int warnmissing);
+
+static void addserver(adns_state ads, const struct sockaddr *sa, int salen) {
   int i;
-  struct server *ss;
+  adns_rr_addr *ss;
+  char buf[ADNS_ADDR2TEXT_BUFLEN];
   
   for (i=0; i<ads->nservers; i++) {
-    if (ads->servers[i].addr.s_addr == addr.s_addr) {
-      debug(ads,"duplicate nameserver %s ignored",inet_ntoa(addr));
+    if (adns__sockaddrs_equal(sa, &ads->servers[i].addr.sa)) {
+      adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
+		  adns__sockaddr_ntoa(sa, buf));
       return;
     }
   }
   
   if (ads->nservers>=MAXSERVERS) {
-    diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr));
+    adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
+	       adns__sockaddr_ntoa(sa, buf));
     return;
   }
 
   ss= ads->servers+ads->nservers;
-  ss->addr= addr;
-  ss->state= server_disc;
-  ss->connw.head= ss->connw.tail= 0;
+  assert(salen <= sizeof(ss->addr));
+  ss->len = salen;
+  memcpy(&ss->addr, sa, salen);
   ads->nservers++;
 }
 
+static void freesearchlist(adns_state ads) {
+  if (ads->nsearchlist) free(*ads->searchlist);
+  free(ads->searchlist);
+}
+
+static void saveerr(adns_state ads, int en) {
+  if (!ads->configerrno) ads->configerrno= en;
+}
+
 static void configparseerr(adns_state ads, const char *fn, int lno,
 			   const char *fmt, ...) {
   va_list al;
-  
-  if (ads->iflags & adns_if_noerrprint) return;
-  if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
-  else fprintf(stderr,"adns: %s:%d: ",fn,lno);
+
+  saveerr(ads,EINVAL);
+  if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
+
+  if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
+  else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
   va_start(al,fmt);
-  vfprintf(stderr,fmt,al);
+  adns__vlprintf(ads,fmt,al);
   va_end(al);
-  fputc('\n',stderr);
+  adns__lprintf(ads,"\n");
 }
 
-static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
-  struct in_addr ia;
-  
-  if (!inet_aton(buf,&ia)) {
+static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
+  const char *p, *q;
+
+  p= *bufp_io;
+  while (ctype_whitespace(*p)) p++;
+  if (!*p) return 0;
+
+  q= p;
+  while (*q && !ctype_whitespace(*q)) q++;
+
+  *l_r= q-p;
+  *word_r= p;
+  *bufp_io= q;
+
+  return 1;
+}
+
+static void ccf_nameserver(adns_state ads, const char *fn,
+			   int lno, const char *buf) {
+  adns_rr_addr a;
+  char addrbuf[ADNS_ADDR2TEXT_BUFLEN];
+  int err;
+
+  a.len= sizeof(a.addr);
+  err= adns_text2addr(buf,DNS_PORT, 0, &a.addr.sa,&a.len);
+  switch (err) {
+  case 0:
+    break;
+  case EINVAL:
     configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
     return;
+  default:
+    configparseerr(ads,fn,lno,"failed to parse nameserver address `%s': %s",
+		   buf,strerror(err));
+    return;
   }
-  debug(ads,"using nameserver %s",inet_ntoa(ia));
-  addserver(ads,ia);
+  adns__debug(ads,-1,0,"using nameserver %s",
+	      adns__sockaddr_ntoa(&a.addr.sa, addrbuf));
+  addserver(ads,&a.addr.sa,a.len);
 }
 
-static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
+static void ccf_search(adns_state ads, const char *fn,
+		       int lno, const char *buf) {
+  const char *bufp, *word;
+  char *newchars, **newptrs, **pp;
+  int count, tl, l;
+
   if (!buf) return;
-  diag(ads,"warning - `search' ignored FIXME");
+
+  bufp= buf;
+  count= 0;
+  tl= 0;
+  while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
+
+  newptrs= malloc(sizeof(char*)*count);
+  if (!newptrs) { saveerr(ads,errno); return; }
+
+  newchars= malloc(tl);
+  if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
+
+  bufp= buf;
+  pp= newptrs;
+  while (nextword(&bufp,&word,&l)) {
+    *pp++= newchars;
+    memcpy(newchars,word,l);
+    newchars += l;
+    *newchars++ = 0;
+  }
+
+  freesearchlist(ads);
+  ads->nsearchlist= count;
+  ads->searchlist= newptrs;
 }
 
-static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
-  diag(ads,"warning - `sortlist' ignored FIXME");
+static int gen_pton(const char *text, int want_af, adns_sockaddr *a) {
+  int err;
+  int len;
+
+  len= sizeof(*a);
+  err= adns_text2addr(text,0, adns_qf_addrlit_scope_forbid,
+		      &a->sa, &len);
+  if (err) { assert(err == EINVAL); return 0; }
+  if (want_af != AF_UNSPEC && a->sa.sa_family != want_af) return 0;
+  return 1;
 }
 
-static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
+static void ccf_sortlist(adns_state ads, const char *fn,
+			 int lno, const char *buf) {
+  const char *word;
+  char tbuf[200], *slash, *ep;
+  const char *maskwhat;
+  struct sortlist *sl;
+  int l;
+  int initial= -1;
+
   if (!buf) return;
-  diag(ads,"warning - `options' ignored FIXME");
+  
+  ads->nsortlist= 0;
+  while (nextword(&buf,&word,&l)) {
+    if (ads->nsortlist >= MAXSORTLIST) {
+      adns__diag(ads,-1,0,"too many sortlist entries,"
+		 " ignoring %.*s onwards",l,word);
+      return;
+    }
+
+    if (l >= sizeof(tbuf)) {
+      configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
+      continue;
+    }
+    
+    memcpy(tbuf,word,l); tbuf[l]= 0;
+    slash= strchr(tbuf,'/');
+    if (slash) *slash++= 0;
+
+    sl= &ads->sortlist[ads->nsortlist];
+    if (!gen_pton(tbuf, AF_UNSPEC, &sl->base)) {
+      configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
+      continue;
+    }
+
+    if (slash) {
+      if (slash[strspn(slash, "0123456789")]) {
+	maskwhat = "mask";
+	if (!gen_pton(slash, sl->base.sa.sa_family, &sl->mask)) {
+	  configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
+	  continue;
+	}
+      } else {
+	maskwhat = "prefix length";
+	initial= strtoul(slash,&ep,10);
+	if (*ep || initial>adns__addr_width(sl->base.sa.sa_family)) {
+	  configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
+	  continue;
+	}
+	sl->mask.sa.sa_family= sl->base.sa.sa_family;
+	adns__prefix_mask(&sl->mask, initial);
+      }
+    } else {
+      maskwhat = "implied prefix length";
+      initial= adns__guess_prefix_length(&sl->base);
+      if (initial < 0) {
+	configparseerr(ads,fn,lno, "network address `%s'"
+		       " in sortlist is not in classed ranges,"
+		       " must specify mask explicitly", tbuf);
+	continue;
+      }
+      sl->mask.sa.sa_family= sl->base.sa.sa_family;
+      adns__prefix_mask(&sl->mask, initial);
+    }
+
+    if (!adns__addr_matches(sl->base.sa.sa_family,
+			    adns__sockaddr_addr(&sl->base.sa),
+			    &sl->base,&sl->mask)) {
+      if (initial >= 0) {
+	configparseerr(ads,fn,lno, "%s %d in sortlist"
+		       " overlaps address `%s'",maskwhat,initial,tbuf);
+      } else {
+	configparseerr(ads,fn,lno, "%s `%s' in sortlist"
+		       " overlaps address `%s'",maskwhat,slash,tbuf);
+      }
+      continue;
+    }
+
+    ads->nsortlist++;
+  }
 }
 
-static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
+static void ccf_options(adns_state ads, const char *fn,
+			int lno, const char *buf) {
+  const char *opt, *word, *endword, *endopt;
+  char *ep;
+  unsigned long v;
+  int l;
+
+  if (!buf) return;
+
+#define WORD__IS(s,op) ((endword-word) op (sizeof(s)-1) && \
+			  !memcmp(word,s,(sizeof(s)-1)))
+#define WORD_IS(s)     (WORD__IS(s,==))
+#define WORD_STARTS(s) (WORD__IS(s,>=) ? ((word+=sizeof(s)-1)) : 0)
+
+  while (nextword(&buf,&word,&l)) {
+    opt=word;
+    endopt=endword=word+l;
+    if (WORD_IS("debug")) {
+      ads->iflags |= adns_if_debug;
+      continue;
+    }
+    if (WORD_STARTS("ndots:")) {
+      v= strtoul(word,&ep,10);
+      if (ep==word || ep != endword || v > INT_MAX) {
+	configparseerr(ads,fn,lno,"option `%.*s' malformed"
+		       " or has bad value",l,opt);
+	continue;
+      }
+      ads->searchndots= v;
+      continue;
+    }
+    if (WORD_STARTS("adns_checkc:")) {
+      if (WORD_IS("none")) {
+	ads->iflags &= ~adns_if_checkc_freq;
+	ads->iflags |= adns_if_checkc_entex;
+      } else if (WORD_IS("entex")) {
+	ads->iflags &= ~adns_if_checkc_freq;
+	ads->iflags |= adns_if_checkc_entex;
+      } else if (WORD_IS("freq")) {
+	ads->iflags |= adns_if_checkc_freq;
+      } else {
+	configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
+		       "(must be none, entex or freq", word);
+      }
+      continue;
+    }
+    if (WORD_STARTS("adns_af:")) {
+      ads->iflags &= ~adns_if_afmask;
+      if (!WORD_IS("any")) for (;;) {
+	const char *comma= memchr(word,',',endopt-word);
+	endword=comma?comma:endopt;
+	if (WORD_IS("ipv4"))
+	  ads->iflags |= adns_if_permit_ipv4;
+	else if (WORD_IS("ipv6"))
+	  ads->iflags |= adns_if_permit_ipv6;
+	else {
+	  configparseerr(ads,fn,lno, "option adns_af has bad value `%.*s' "
+			 "(must be `any' or list {`ipv4',`ipv6'},...)",
+			 (int)(endword-word), word);
+	  break;
+	}
+	if (!comma) break;
+	word= comma+1;
+      }
+      continue;
+    }
+    if (WORD_IS("adns_ignoreunkcfg")) {
+      ads->config_report_unknown=0;
+      continue;
+    }
+    if (/* adns's query strategy is not configurable */
+	WORD_STARTS("timeout:") ||
+	WORD_STARTS("attempts:") ||
+	WORD_IS("rotate") ||
+	/* adns provides the application with knob for this */
+	WORD_IS("no-check-names") ||
+	/* adns normally does IPv6 if the application wants it; control
+	 * this with the adns_af: option if you like */
+	WORD_IS("inet6") ||
+	/* adns does not do edns0 and this is not a problem */
+	WORD_IS("edns0"))
+      continue;
+    if (ads->config_report_unknown)
+      adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,opt);
+  }
+
+#undef WORD__IS
+#undef WORD_IS
+#undef WORD_STARTS
+}
+
+static void ccf_clearnss(adns_state ads, const char *fn,
+			 int lno, const char *buf) {
   ads->nservers= 0;
 }
 
+static void ccf_include(adns_state ads, const char *fn,
+			int lno, const char *buf) {
+  if (!*buf) {
+    configparseerr(ads,fn,lno,"`include' directive with no filename");
+    return;
+  }
+  readconfig(ads,buf,1);
+}
+
+static void ccf_lookup(adns_state ads, const char *fn, int lno,
+		       const char *buf) {
+  int found_bind=0;
+  const char *word;
+  int l;
+
+  if (!*buf) {
+    configparseerr(ads,fn,lno,"`lookup' directive with no databases");
+    return;
+  }
+
+  while (nextword(&buf,&word,&l)) {
+    if (l==4 && !memcmp(word,"bind",4)) {
+      found_bind=1;
+    } else if (l==4 && !memcmp(word,"file",4)) {
+      /* ignore this and hope /etc/hosts is not essential */
+    } else if (l==2 && !memcmp(word,"yp",2)) {
+      adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
+      found_bind=-1;
+    } else {
+      if (ads->config_report_unknown)
+	adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
+		   fn,lno, l,word);
+      found_bind=-1;
+    }
+  }
+  if (!found_bind)
+    adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
+}
+
+static void ccf_ignore(adns_state ads, const char *fn, int lno,
+		       const char *buf) {
+}
+
 static const struct configcommandinfo {
   const char *name;
   void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
@@ -113,135 +407,435 @@ static const struct configcommandinfo {
   { "sortlist",          ccf_sortlist    },
   { "options",           ccf_options     },
   { "clearnameservers",  ccf_clearnss    },
+  { "include",           ccf_include     },
+  { "lookup",            ccf_lookup      }, /* OpenBSD */
+  { "lwserver",          ccf_ignore      }, /* BIND9 lwresd */
   {  0                                   }
 };
 
-static void readconfig(adns_state ads, const char *filename) {
-  char linebuf[2000], *p, *q;
+typedef union {
   FILE *file;
-  int lno, l, c;
-  const struct configcommandinfo *ccip;
-
-  file= fopen(filename,"r");
-  if (!file) {
-    if (errno == ENOENT) {
-      debug(ads,"configuration file `%s' does not exist",filename);
-      return;
+  const char *text;
+} getline_ctx;
+
+static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
+		   int lno, char *buf, int buflen) {
+  FILE *file= src_io->file;
+  int c, i;
+  char *p;
+
+  p= buf;
+  buflen--;
+  i= 0;
+    
+  for (;;) { /* loop over chars */
+    if (i == buflen) {
+      adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
+      goto x_badline;
+    }
+    c= getc(file);
+    if (!c) {
+      adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
+      goto x_badline;
+    } else if (c == '\n') {
+      break;
+    } else if (c == EOF) {
+      if (ferror(file)) {
+	saveerr(ads,errno);
+	adns__diag(ads,-1,0,"%s:%d: read error: %s",
+		   filename,lno,strerror(errno));
+	return -1;
+      }
+      if (!i) return -1;
+      break;
+    } else {
+      *p++= c;
+      i++;
     }
-    diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno));
-    return;
   }
 
-  for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
-    l= strlen(linebuf);
-    if (!l) continue;
-    if (linebuf[l-1] != '\n' && !feof(file)) {
-      diag(ads,"%s:%d: line too long",filename,lno);
-      while ((c= getc(file)) != EOF && c != '\n') { }
-      if (c == EOF) break;
-      continue;
-    }
+  *p++= 0;
+  return i;
+
+ x_badline:
+  saveerr(ads,EINVAL);
+  while ((c= getc(file)) != EOF && c != '\n');
+  return -2;
+}
+
+static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
+		   int lno, char *buf, int buflen) {
+  const char *cp= src_io->text;
+  int l;
+
+  if (!cp || !*cp) return -1;
+
+  if (*cp == ';' || *cp == '\n') cp++;
+  l= strcspn(cp,";\n");
+  src_io->text = cp+l;
+
+  if (l >= buflen) {
+    adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
+    saveerr(ads,EINVAL);
+    return -2;
+  }
+    
+  memcpy(buf,cp,l);
+  buf[l]= 0;
+  return l;
+}
+
+static void readconfiggeneric(adns_state ads, const char *filename,
+			      int (*getline)(adns_state ads, getline_ctx*,
+					     const char *filename, int lno,
+					     char *buf, int buflen),
+			      /* Returns >=0 for success, -1 for EOF or error
+			       * (error will have been reported), or -2 for
+			       * bad line was encountered, try again.
+			       */
+			      getline_ctx gl_ctx) {
+  char linebuf[2000], *p, *q;
+  int lno, l, dirl;
+  const struct configcommandinfo *ccip;
+
+  for (lno=1;
+       (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
+       lno++) {
+    if (l == -2) continue;
     while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
     linebuf[l]= 0;
     p= linebuf;
     while (ctype_whitespace(*p)) p++;
-    if (*p == '#' || *p == '\n') continue;
+    if (*p == '#' || *p == ';' || !*p) continue;
     q= p;
     while (*q && !ctype_whitespace(*q)) q++;
+    dirl= q-p;
     for (ccip=configcommandinfos;
-	 ccip->name && strncmp(ccip->name,p,q-p);
+	 ccip->name &&
+	   !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
 	 ccip++);
     if (!ccip->name) {
-      diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
+      if (ads->config_report_unknown)
+	adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
+		   filename,lno,(int)(q-p),p);
       continue;
     }
     while (ctype_whitespace(*q)) q++;
     ccip->fn(ads,filename,lno,q);
   }
-  if (ferror(file)) {
-    diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno));
-  }
-  fclose(file);
 }
 
 static const char *instrum_getenv(adns_state ads, const char *envvar) {
   const char *value;
 
   value= getenv(envvar);
-  if (!value) debug(ads,"environment variable %s not set",envvar);
-  else debug(ads,"environment variable %s set to `%s'",envvar,value);
+  if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
+  else adns__debug(ads,-1,0,"environment variable %s"
+		   " set to `%s'",envvar,value);
   return value;
 }
 
+static void readconfig(adns_state ads, const char *filename, int warnmissing) {
+  getline_ctx gl_ctx;
+  
+  gl_ctx.file= fopen(filename,"r");
+  if (!gl_ctx.file) {
+    if (errno == ENOENT) {
+      if (warnmissing)
+	adns__debug(ads,-1,0, "configuration file"
+		    " `%s' does not exist",filename);
+      return;
+    }
+    saveerr(ads,errno);
+    adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
+	       filename,strerror(errno));
+    return;
+  }
+
+  readconfiggeneric(ads,filename,gl_file,gl_ctx);
+  
+  fclose(gl_ctx.file);
+}
+
+static void readconfigtext(adns_state ads, const char *text,
+			   const char *showname) {
+  getline_ctx gl_ctx;
+  
+  gl_ctx.text= text;
+  readconfiggeneric(ads,showname,gl_text,gl_ctx);
+}
+  
 static void readconfigenv(adns_state ads, const char *envvar) {
   const char *filename;
 
   if (ads->iflags & adns_if_noenv) {
-    debug(ads,"not checking environment variable `%s'",envvar);
+    adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
     return;
   }
   filename= instrum_getenv(ads,envvar);
-  if (filename) readconfig(ads,filename);
+  if (filename) readconfig(ads,filename,1);
+}
+
+static void readconfigenvtext(adns_state ads, const char *envvar) {
+  const char *textdata;
+
+  if (ads->iflags & adns_if_noenv) {
+    adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
+    return;
+  }
+  textdata= instrum_getenv(ads,envvar);
+  if (textdata) readconfigtext(ads,textdata,envvar);
 }
+
+
+int adns__setnonblock(adns_state ads, int fd) {
+  int r;
   
-int adns_init(adns_state *ads_r, adns_initflags flags) {
+  r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
+  r |= O_NONBLOCK;
+  r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
+  return 0;
+}
+
+static int init_begin(adns_state *ads_r, adns_initflags flags,
+		      adns_logcallbackfn *logfn, void *logfndata) {
   adns_state ads;
-  const char *res_options, *adns_res_options;
-  struct protoent *proto;
-  int r;
+  pid_t pid;
   
+  if (flags & ~(adns_initflags)(0x4fff))
+    /* 0x4000 is reserved for `harmless' future expansion */
+    return ENOSYS;
+
   ads= malloc(sizeof(*ads)); if (!ads) return errno;
-  ads->tosend.head= ads->tosend.tail= 0;
-  ads->timew.head= ads->timew.tail= 0;
-  ads->childw.head= ads->childw.tail= 0;
-  ads->output.head= ads->output.tail= 0;
-  ads->nextid= 0x311f;
-  ads->udpsocket= -1;
-  ads->qbufavail= 0;
-  ads->qbuf= 0;
-  ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
-  ads->tcpbuf= 0;
-  ads->iflags= flags;
-  ads->nservers= 0;
+
   ads->iflags= flags;
+  ads->logfn= logfn;
+  ads->logfndata= logfndata;
+  ads->configerrno= 0;
+  LIST_INIT(ads->udpw);
+  LIST_INIT(ads->tcpw);
+  LIST_INIT(ads->childw);
+  LIST_INIT(ads->output);
+  LIST_INIT(ads->intdone);
+  ads->forallnext= 0;
+  ads->nextid= 0x311f;
+  ads->nudpsockets= 0;
+  ads->tcpsocket= -1;
+  adns__vbuf_init(&ads->tcpsend);
+  adns__vbuf_init(&ads->tcprecv);
+  ads->tcprecv_skip= 0;
+  ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
+  ads->searchndots= 1;
+  ads->tcpstate= server_disconnected;
+  timerclear(&ads->tcptimeout);
+  ads->searchlist= 0;
+  ads->config_report_unknown=1;
+
+  pid= getpid();
+  ads->rand48xsubi[0]= pid;
+  ads->rand48xsubi[1]= (unsigned long)pid >> 16;
+  ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
+
+  *ads_r= ads;
+  return 0;
+}
+
+static int init_finish(adns_state ads) {
+  struct sockaddr_in sin;
+  struct protoent *proto;
+  struct udpsocket *udp;
+  int i;
+  int r;
+  
+  if (!ads->nservers) {
+    if (ads->logfn && ads->iflags & adns_if_debug)
+      adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
+    memset(&sin, 0, sizeof(sin));
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons(DNS_PORT);
+    sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
+  }
+
+  proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
+  ads->nudpsockets= 0;
+  for (i=0; i<ads->nservers; i++) {
+    if (adns__udpsocket_by_af(ads, ads->servers[i].addr.sa.sa_family))
+      continue;
+    assert(ads->nudpsockets < MAXUDP);
+    udp= &ads->udpsockets[ads->nudpsockets];
+    udp->af= ads->servers[i].addr.sa.sa_family;
+    udp->fd= socket(udp->af,SOCK_DGRAM,proto->p_proto);
+    if (udp->fd < 0) { r= errno; goto x_free; }
+    ads->nudpsockets++;
+    r= adns__setnonblock(ads,udp->fd);
+    if (r) { r= errno; goto x_closeudp; }
+  }
+  
+  return 0;
+
+ x_closeudp:
+  for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd);
+ x_free:
+  free(ads);
+  return r;
+}
 
+static void init_abort(adns_state ads) {
+  if (ads->nsearchlist) {
+    free(ads->searchlist[0]);
+    free(ads->searchlist);
+  }
+  free(ads);
+}
+
+static void logfn_file(adns_state ads, void *logfndata,
+		       const char *fmt, va_list al) {
+  vfprintf(logfndata,fmt,al);
+}
+
+static int init_files(adns_state *ads_r, adns_initflags flags,
+		      adns_logcallbackfn *logfn, void *logfndata) {
+  adns_state ads;
+  const char *res_options, *adns_res_options;
+  int r;
+  
+  r= init_begin(&ads, flags, logfn, logfndata);
+  if (r) return r;
+  
   res_options= instrum_getenv(ads,"RES_OPTIONS");
   adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
   ccf_options(ads,"RES_OPTIONS",-1,res_options);
   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 
-  readconfig(ads,"/etc/resolv.conf");
+  readconfig(ads,"/etc/resolv.conf",1);
+  readconfig(ads,"/etc/resolv-adns.conf",0);
   readconfigenv(ads,"RES_CONF");
   readconfigenv(ads,"ADNS_RES_CONF");
 
+  readconfigenvtext(ads,"RES_CONF_TEXT");
+  readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
+
   ccf_options(ads,"RES_OPTIONS",-1,res_options);
   ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
 
   ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
   ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
 
-  if (!ads->nservers) {
-    struct in_addr ia;
-    if (ads->iflags & adns_if_debug)
-      fprintf(stderr,"adns: no nameservers, using localhost\n");
-    ia.s_addr= INADDR_LOOPBACK;
-    addserver(ads,ia);
+  if (ads->configerrno && ads->configerrno != EINVAL) {
+    r= ads->configerrno;
+    init_abort(ads);
+    return r;
   }
 
-  proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
-  ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
-  if (!ads->udpsocket) { r= errno; goto x_closeudp; }
-  
+  r= init_finish(ads);
+  if (r) return r;
+
+  adns__consistency(ads,0,cc_entex);
   *ads_r= ads;
   return 0;
+}
 
- x_closeudp:
-  close(ads->udpsocket);
- x_free:
+int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
+  return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
+}
+
+static int init_strcfg(adns_state *ads_r, adns_initflags flags,
+		       adns_logcallbackfn *logfn, void *logfndata,
+		       const char *configtext) {
+  adns_state ads;
+  int r;
+
+  r= init_begin(&ads, flags, logfn, logfndata);
+  if (r) return r;
+
+  readconfigtext(ads,configtext,"<supplied configuration text>");
+  if (ads->configerrno) {
+    r= ads->configerrno;
+    init_abort(ads);
+    return r;
+  }
+
+  r= init_finish(ads);  if (r) return r;
+  adns__consistency(ads,0,cc_entex);
+  *ads_r= ads;
+  return 0;
+}
+
+int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
+		     FILE *diagfile, const char *configtext) {
+  return init_strcfg(ads_r, flags,
+		     diagfile ? logfn_file : 0, diagfile,
+		     configtext);
+}
+
+int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
+		    const char *configtext /*0=>use default config files*/,
+		    adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
+		    void *logfndata /*0 with logfn==0 => discard*/) {
+  if (!logfn && logfndata)
+    logfn= logfn_file;
+  if (configtext)
+    return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
+  else
+    return init_files(newstate_r, flags, logfn, logfndata);
+}
+
+void adns_finish(adns_state ads) {
+  int i;
+  adns__consistency(ads,0,cc_entex);
+  for (;;) {
+    if (ads->udpw.head) adns__cancel(ads->udpw.head);
+    else if (ads->tcpw.head) adns__cancel(ads->tcpw.head);
+    else if (ads->childw.head) adns__cancel(ads->childw.head);
+    else if (ads->output.head) adns__cancel(ads->output.head);
+    else if (ads->intdone.head) adns__cancel(ads->output.head);
+    else break;
+  }
+  for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd);
+  if (ads->tcpsocket >= 0) close(ads->tcpsocket);
+  adns__vbuf_free(&ads->tcpsend);
+  adns__vbuf_free(&ads->tcprecv);
+  freesearchlist(ads);
   free(ads);
-  return r;
 }
 
-int adns_finish(adns_state ads) {
-  abort(); /* FIXME */
+void adns_forallqueries_begin(adns_state ads) {
+  adns__consistency(ads,0,cc_entex);
+  ads->forallnext=
+    ads->udpw.head ? ads->udpw.head :
+    ads->tcpw.head ? ads->tcpw.head :
+    ads->childw.head ? ads->childw.head :
+    ads->output.head;
+}
+  
+adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
+  adns_query qu, nqu;
+
+  adns__consistency(ads,0,cc_entex);
+  nqu= ads->forallnext;
+  for (;;) {
+    qu= nqu;
+    if (!qu) return 0;
+    if (qu->next) {
+      nqu= qu->next;
+    } else if (qu == ads->udpw.tail) {
+      nqu=
+	ads->tcpw.head ? ads->tcpw.head :
+	ads->childw.head ? ads->childw.head :
+	ads->output.head;
+    } else if (qu == ads->tcpw.tail) {
+      nqu=
+	ads->childw.head ? ads->childw.head :
+	ads->output.head;
+    } else if (qu == ads->childw.tail) {
+      nqu= ads->output.head;
+    } else {
+      nqu= 0;
+    }
+    if (!qu->parent) break;
+  }
+  ads->forallnext= nqu;
+  if (context_r) *context_r= qu->ctx.ext;
+  return qu;
 }