[adns] / src / setup.c

/*
 * setup.c
 * - configuration file parsing
 * - management of global state
 */
/*
 *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
 *  
 *  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 2, 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,
 *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
 */

#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.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);

static void addserver(adns_state ads, struct in_addr addr) {
  int i;
  struct server *ss;
  
  for (i=0; i<ads->nservers; i++) {
    if (ads->servers[i].addr.s_addr == addr.s_addr) {
      adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
      return;
    }
  }
  
  if (ads->nservers>=MAXSERVERS) {
    adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
    return;
  }

  ss= ads->servers+ads->nservers;
  ss->addr= addr;
  ads->nservers++;
}

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;

  saveerr(ads,EINVAL);
  if (!ads->diagfile || (ads->iflags & adns_if_noerrprint)) return;

  if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
  else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
  va_start(al,fmt);
  vfprintf(ads->diagfile,fmt,al);
  va_end(al);
  fputc('\n',ads->diagfile);
}

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) {
  struct in_addr ia;
  
  if (!inet_aton(buf,&ia)) {
    configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
    return;
  }
  adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
  addserver(ads,ia);
}

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;

  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;
  }

  free(ads->searchlist);
  ads->nsearchlist= count;
  ads->searchlist= newptrs;
}

static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
  const char *word;
  char tbuf[200], *slash, *ep;
  struct in_addr base, mask;
  int l;
  unsigned long initial, baselocal;

  if (!buf) return;
  
  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;
    
    if (!inet_aton(tbuf,&base)) {
      configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
      continue;
    }

    if (slash) {
      if (strchr(slash,'.')) {
	if (!inet_aton(slash,&mask)) {
	  configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
	  continue;
	}
	if (base.s_addr & ~mask.s_addr) {
	  configparseerr(ads,fn,lno,
			 "mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
	  continue;
	}
      } else {
	initial= strtoul(slash,&ep,10);
	if (*ep || initial>32) {
	  configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
	  continue;
	}
	mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
      }
    } else {
      baselocal= ntohl(base.s_addr);
      if (!baselocal & 0x080000000UL) /* class A */
	mask.s_addr= htonl(0x0ff000000UL);
      else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
	mask.s_addr= htonl(0x0ffff0000UL); /* class B */
      else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
	mask.s_addr= htonl(0x0ff000000UL); /* class C */
      else {
	configparseerr(ads,fn,lno,
		       "network address `%s' in sortlist is not in classed ranges,"
		       " must specify mask explicitly", tbuf);
	continue;
      }
    }

    ads->sortlist[ads->nsortlist].base= base;
    ads->sortlist[ads->nsortlist].mask= mask;
    ads->nsortlist++;
  }
}

static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
  const char *word;
  char *ep;
  unsigned long v;
  int l;

  if (!buf) return;

  while (nextword(&buf,&word,&l)) {
    if (l==5 && !memcmp(word,"debug",5)) {
      ads->iflags |= adns_if_debug;
      continue;
    }
    if (l>=6 && !memcmp(word,"ndots:",6)) {
      v= strtoul(word+6,&ep,10);
      if (l==6 || ep != word+l || v > INT_MAX) {
	configparseerr(ads,fn,lno,"option `%.*s' malformed or has bad value",l,word);
	continue;
      }
      ads->searchndots= v;
      continue;
    }
    if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
      if (!strcmp(word+12,"none")) {
	ads->iflags &= ~adns_if_checkc_freq;
	ads->iflags |= adns_if_checkc_entex;
      } else if (!strcmp(word+12,"entex")) {
	ads->iflags &= ~adns_if_checkc_freq;
	ads->iflags |= adns_if_checkc_entex;
      } else if (!strcmp(word+12,"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+12);
      }
      continue;
    }
    adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
  }
}

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);
}

static const struct configcommandinfo {
  const char *name;
  void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
} configcommandinfos[]= {
  { "nameserver",        ccf_nameserver  },
  { "domain",            ccf_search      },
  { "search",            ccf_search      },
  { "sortlist",          ccf_sortlist    },
  { "options",           ccf_options     },
  { "clearnameservers",  ccf_clearnss    },
  { "include",           ccf_include     },
  {  0                                   }
};

typedef union {
  FILE *file;
  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++;
    }
  }

  *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) continue;
    q= p;
    while (*q && !ctype_whitespace(*q)) q++;
    dirl= q-p;
    for (ccip=configcommandinfos;
	 ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
	 ccip++);
    if (!ccip->name) {
      adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
		 filename,lno,q-p,p);
      continue;
    }
    while (ctype_whitespace(*q)) q++;
    ccip->fn(ads,filename,lno,q);
  }
}

static const char *instrum_getenv(adns_state ads, const char *envvar) {
  const char *value;

  value= getenv(envvar);
  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) {
  getline_ctx gl_ctx;
  
  gl_ctx.file= fopen(filename,"r");
  if (!gl_ctx.file) {
    if (errno == ENOENT) {
      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) {
    adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
    return;
  }
  filename= instrum_getenv(ads,envvar);
  if (filename) readconfig(ads,filename);
}

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;
  
  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, FILE *diagfile) {
  adns_state ads;
  
  ads= malloc(sizeof(*ads)); if (!ads) return errno;

  ads->iflags= flags;
  ads->diagfile= diagfile;
  ads->configerrno= 0;
  LIST_INIT(ads->timew);
  LIST_INIT(ads->childw);
  LIST_INIT(ads->output);
  ads->forallnext= 0;
  ads->nextid= 0x311f;
  ads->udpsocket= ads->tcpsocket= -1;
  adns__vbuf_init(&ads->tcpsend);
  adns__vbuf_init(&ads->tcprecv);
  ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
  ads->searchndots= 1;
  ads->tcpstate= server_disconnected;
  timerclear(&ads->tcptimeout);
  ads->searchlist= 0;

  *ads_r= ads;
  return 0;
}

static int init_finish(adns_state ads) {
  struct in_addr ia;
  struct protoent *proto;
  int r;
  
  if (!ads->nservers) {
    if (ads->diagfile && ads->iflags & adns_if_debug)
      fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
    ia.s_addr= htonl(INADDR_LOOPBACK);
    addserver(ads,ia);
  }

  proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
  ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
  if (ads->udpsocket<0) { r= errno; goto x_free; }

  r= adns__setnonblock(ads,ads->udpsocket);
  if (r) { r= errno; goto x_closeudp; }
  
  return 0;

 x_closeudp:
  close(ads->udpsocket);
 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);
}

int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
  adns_state ads;
  const char *res_options, *adns_res_options;
  int r;
  
  r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
  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");
  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->configerrno && ads->configerrno != EINVAL) {
    r= ads->configerrno;
    init_abort(ads);
    return r;
  }

  r= init_finish(ads);
  if (r) return r;

  adns__consistency(ads,cc_entex);
  *ads_r= ads;
  return 0;
}

int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
		     FILE *diagfile, const char *configtext) {
  adns_state ads;
  int r;

  r= init_begin(&ads, flags, diagfile);  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,cc_entex);
  *ads_r= ads;
  return 0;
}


void adns_finish(adns_state ads) {
  adns__consistency(ads,cc_entex);
  for (;;) {
    if (ads->timew.head) adns_cancel(ads->timew.head);
    else if (ads->childw.head) adns_cancel(ads->childw.head);
    else if (ads->output.head) adns_cancel(ads->output.head);
    else break;
  }
  close(ads->udpsocket);
  if (ads->tcpsocket >= 0) close(ads->tcpsocket);
  adns__vbuf_free(&ads->tcpsend);
  adns__vbuf_free(&ads->tcprecv);
  free(ads);
}

void adns_forallqueries_begin(adns_state ads) {
  adns__consistency(ads,cc_entex);
  ads->forallnext=
    ads->timew.head ? ads->timew.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,cc_entex);
  nqu= ads->forallnext;
  for (;;) {
    qu= nqu;
    if (!qu) return 0;
    if (qu->next) {
      nqu= qu->next;
    } else if (qu == ads->timew.tail) {
      if (ads->childw.head) {
	nqu= ads->childw.head;
      } else {
	nqu= 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;
}

void adns__checkqueues(adns_state ads) {
  adns_forallqueries_begin(ads);
  while (adns_forallqueries_next(ads,0));
}
Commit	Line	Data
e576be50	1	/*
	2	* setup.c
	3	* - configuration file parsing
	4	* - management of global state
	5	*/
	6	/*
a719a4be	7	* This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
e576be50	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2, or (at your option)
	12	* any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software Foundation,
	21	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
656b2da9	23
4353a5c4	24	#include <stdlib.h>
4353a5c4	25	#include <errno.h>
78bcc172	26	#include <limits.h>
4353a5c4	27	#include <unistd.h>
4353a5c4	28	#include <fcntl.h>
656b2da9	29
4353a5c4	30	#include <netdb.h>
71a6ff46	31	#include <sys/socket.h>
71a6ff46	32	#include <netinet/in.h>
4353a5c4	33	#include <arpa/inet.h>
	34
	35	#include "internal.h"
	36
36369543	37	static void readconfig(adns_state ads, const char *filename);
36369543	38
656b2da9	39	static void addserver(adns_state ads, struct in_addr addr) {
	40	int i;
	41	struct server *ss;
	42
	43	for (i=0; i<ads->nservers; i++) {
	44	if (ads->servers[i].addr.s_addr == addr.s_addr) {
3955725c	45	adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
656b2da9	46	return;
	47	}
	48	}
	49
	50	if (ads->nservers>=MAXSERVERS) {
3955725c	51	adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
656b2da9	52	return;
	53	}
	54
	55	ss= ads->servers+ads->nservers;
	56	ss->addr= addr;
656b2da9	57	ads->nservers++;
	58	}
	59
36369543	60	static void saveerr(adns_state ads, int en) {
	61	if (!ads->configerrno) ads->configerrno= en;
	62	}
	63
656b2da9	64	static void configparseerr(adns_state ads, const char *fn, int lno,
	65	const char *fmt, ...) {
	66	va_list al;
36369543	67
	68	saveerr(ads,EINVAL);
	69	if (!ads->diagfile \|\| (ads->iflags & adns_if_noerrprint)) return;
	70
	71	if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
	72	else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
656b2da9	73	va_start(al,fmt);
36369543	74	vfprintf(ads->diagfile,fmt,al);
656b2da9	75	va_end(al);
36369543	76	fputc('\n',ads->diagfile);
656b2da9	77	}
656b2da9	78
32af6b2a	79	static int nextword(const char bufp_io, const char word_r, int *l_r) {
	80	const char p, q;
	81
	82	p= *bufp_io;
	83	while (ctype_whitespace(*p)) p++;
	84	if (!*p) return 0;
	85
	86	q= p;
	87	while (q && !ctype_whitespace(q)) q++;
	88
	89	*l_r= q-p;
	90	*word_r= p;
	91	*bufp_io= q;
	92
	93	return 1;
	94	}
	95
656b2da9	96	static void ccf_nameserver(adns_state ads, const char fn, int lno, const char buf) {
	97	struct in_addr ia;
	98
	99	if (!inet_aton(buf,&ia)) {
	100	configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
	101	return;
	102	}
3955725c	103	adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
656b2da9	104	addserver(ads,ia);
	105	}
	106
	107	static void ccf_search(adns_state ads, const char fn, int lno, const char buf) {
32af6b2a	108	const char bufp, word;
	109	char newchars, newptrs, *pp;
	110	int count, tl, l;
	111
656b2da9	112	if (!buf) return;
32af6b2a	113
	114	bufp= buf;
	115	count= 0;
	116	tl= 0;
	117	while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
	118
	119	newptrs= malloc(sizeof(char)count); if (!newptrs) { saveerr(ads,errno); return; }
	120	newchars= malloc(tl); if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
	121
	122	bufp= buf;
	123	pp= newptrs;
	124	while (nextword(&bufp,&word,&l)) {
	125	*pp++= newchars;
	126	memcpy(newchars,word,l);
	127	newchars += l;
	128	*newchars++ = 0;
	129	}
	130
	131	free(ads->searchlist);
	132	ads->nsearchlist= count;
	133	ads->searchlist= newptrs;
656b2da9	134	}
656b2da9	135
32af6b2a	136	static void ccf_sortlist(adns_state ads, const char fn, int lno, const char buf) {
32af6b2a	137	const char *word;
09957b1c	138	char tbuf[200], slash, ep;
	139	struct in_addr base, mask;
	140	int l;
	141	unsigned long initial, baselocal;
	142
32af6b2a	143	if (!buf) return;
32af6b2a	144
09957b1c	145	ads->nsortlist= 0;
32af6b2a	146	while (nextword(&buf,&word,&l)) {
09957b1c	147	if (ads->nsortlist >= MAXSORTLIST) {
32af6b2a	148	adns__diag(ads,-1,0,"too many sortlist entries, ignoring %.*s onwards",l,word);
09957b1c	149	return;
	150	}
	151
	152	if (l >= sizeof(tbuf)) {
32af6b2a	153	configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
09957b1c	154	continue;
	155	}
	156
78bcc172	157	memcpy(tbuf,word,l); tbuf[l]= 0;
09957b1c	158	slash= strchr(tbuf,'/');
	159	if (slash) *slash++= 0;
	160
	161	if (!inet_aton(tbuf,&base)) {
	162	configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
	163	continue;
	164	}
	165
	166	if (slash) {
	167	if (strchr(slash,'.')) {
	168	if (!inet_aton(slash,&mask)) {
	169	configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
	170	continue;
	171	}
	172	if (base.s_addr & ~mask.s_addr) {
	173	configparseerr(ads,fn,lno,
	174	"mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
	175	continue;
	176	}
	177	} else {
	178	initial= strtoul(slash,&ep,10);
	179	if (*ep \|\| initial>32) {
	180	configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
	181	continue;
	182	}
	183	mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
	184	}
	185	} else {
	186	baselocal= ntohl(base.s_addr);
	187	if (!baselocal & 0x080000000UL) /* class A */
	188	mask.s_addr= htonl(0x0ff000000UL);
	189	else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
	190	mask.s_addr= htonl(0x0ffff0000UL); /* class B */
	191	else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
	192	mask.s_addr= htonl(0x0ff000000UL); /* class C */
	193	else {
	194	configparseerr(ads,fn,lno,
	195	"network address `%s' in sortlist is not in classed ranges,"
	196	" must specify mask explicitly", tbuf);
	197	continue;
	198	}
	199	}
	200
	201	ads->sortlist[ads->nsortlist].base= base;
	202	ads->sortlist[ads->nsortlist].mask= mask;
	203	ads->nsortlist++;
	204	}
656b2da9	205	}
	206
	207	static void ccf_options(adns_state ads, const char fn, int lno, const char buf) {
78bcc172	208	const char *word;
	209	char *ep;
	210	unsigned long v;
	211	int l;
	212
656b2da9	213	if (!buf) return;
78bcc172	214
	215	while (nextword(&buf,&word,&l)) {
	216	if (l==5 && !memcmp(word,"debug",5)) {
	217	ads->iflags \|= adns_if_debug;
	218	continue;
	219	}
	220	if (l>=6 && !memcmp(word,"ndots:",6)) {
	221	v= strtoul(word+6,&ep,10);
	222	if (l==6 \|\| ep != word+l \|\| v > INT_MAX) {
	223	configparseerr(ads,fn,lno,"option `%.*s' malformed or has bad value",l,word);
	224	continue;
	225	}
	226	ads->searchndots= v;
	227	continue;
	228	}
3e2e5fab	229	if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
	230	if (!strcmp(word+12,"none")) {
	231	ads->iflags &= ~adns_if_checkc_freq;
	232	ads->iflags \|= adns_if_checkc_entex;
	233	} else if (!strcmp(word+12,"entex")) {
	234	ads->iflags &= ~adns_if_checkc_freq;
	235	ads->iflags \|= adns_if_checkc_entex;
	236	} else if (!strcmp(word+12,"freq")) {
	237	ads->iflags \|= adns_if_checkc_freq;
	238	} else {
	239	configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
	240	"(must be none, entex or freq", word+12);
	241	}
	242	continue;
	243	}
78bcc172	244	adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
78bcc172	245	}
656b2da9	246	}
	247
	248	static void ccf_clearnss(adns_state ads, const char fn, int lno, const char buf) {
	249	ads->nservers= 0;
	250	}
	251
36369543	252	static void ccf_include(adns_state ads, const char fn, int lno, const char buf) {
	253	if (!*buf) {
	254	configparseerr(ads,fn,lno,"`include' directive with no filename");
	255	return;
	256	}
	257	readconfig(ads,buf);
	258	}
	259
656b2da9	260	static const struct configcommandinfo {
	261	const char *name;
	262	void (fn)(adns_state ads, const char fn, int lno, const char *buf);
	263	} configcommandinfos[]= {
	264	{ "nameserver", ccf_nameserver },
	265	{ "domain", ccf_search },
	266	{ "search", ccf_search },
	267	{ "sortlist", ccf_sortlist },
	268	{ "options", ccf_options },
	269	{ "clearnameservers", ccf_clearnss },
36369543	270	{ "include", ccf_include },
656b2da9	271	{ 0 }
	272	};
	273
36369543	274	typedef union {
656b2da9	275	FILE *file;
36369543	276	const char *text;
36369543	277	} getline_ctx;
656b2da9	278
36369543	279	static int gl_file(adns_state ads, getline_ctx src_io, const char filename,
	280	int lno, char *buf, int buflen) {
	281	FILE *file= src_io->file;
	282	int c, i;
	283	char *p;
	284
	285	p= buf;
	286	buflen--;
	287	i= 0;
	288
	289	for (;;) { /* loop over chars */
	290	if (i == buflen) {
	291	adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
	292	goto x_badline;
	293	}
	294	c= getc(file);
	295	if (!c) {
	296	adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
	297	goto x_badline;
	298	} else if (c == '\n') {
	299	break;
	300	} else if (c == EOF) {
	301	if (ferror(file)) {
	302	saveerr(ads,errno);
	303	adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
	304	return -1;
	305	}
	306	if (!i) return -1;
	307	break;
	308	} else {
	309	*p++= c;
	310	i++;
656b2da9	311	}
656b2da9	312	}
656b2da9	313
36369543	314	*p++= 0;
	315	return i;
	316
	317	x_badline:
	318	saveerr(ads,EINVAL);
	319	while ((c= getc(file)) != EOF && c != '\n');
	320	return -2;
	321	}
	322
	323	static int gl_text(adns_state ads, getline_ctx src_io, const char filename,
	324	int lno, char *buf, int buflen) {
09957b1c	325	const char *cp= src_io->text;
36369543	326	int l;
36369543	327
09957b1c	328	if (!cp \|\| !*cp) return -1;
36369543	329
09957b1c	330	if (cp == ';' \|\| cp == '\n') cp++;
	331	l= strcspn(cp,";\n");
	332	src_io->text = cp+l;
36369543	333
	334	if (l >= buflen) {
	335	adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
	336	saveerr(ads,EINVAL);
	337	return -2;
	338	}
	339
	340	memcpy(buf,cp,l);
	341	buf[l]= 0;
	342	return l;
	343	}
	344
	345	static void readconfiggeneric(adns_state ads, const char *filename,
	346	int (getline)(adns_state ads, getline_ctx,
	347	const char *filename, int lno,
	348	char *buf, int buflen),
	349	/* Returns >=0 for success, -1 for EOF or error
	350	* (error will have been reported), or -2 for
	351	* bad line was encountered, try again.
	352	*/
	353	getline_ctx gl_ctx) {
	354	char linebuf[2000], p, q;
	355	int lno, l, dirl;
	356	const struct configcommandinfo *ccip;
	357
	358	for (lno=1;
	359	(l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
	360	lno++) {
	361	if (l == -2) continue;
656b2da9	362	while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
	363	linebuf[l]= 0;
	364	p= linebuf;
	365	while (ctype_whitespace(*p)) p++;
36369543	366	if (p == '#' \|\| !p) continue;
656b2da9	367	q= p;
656b2da9	368	while (q && !ctype_whitespace(q)) q++;
36369543	369	dirl= q-p;
656b2da9	370	for (ccip=configcommandinfos;
36369543	371	ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
656b2da9	372	ccip++);
656b2da9	373	if (!ccip->name) {
3955725c	374	adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
4353a5c4	375	filename,lno,q-p,p);
656b2da9	376	continue;
	377	}
	378	while (ctype_whitespace(*q)) q++;
	379	ccip->fn(ads,filename,lno,q);
	380	}
656b2da9	381	}
	382
	383	static const char instrum_getenv(adns_state ads, const char envvar) {
	384	const char *value;
	385
	386	value= getenv(envvar);
3955725c	387	if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
3955725c	388	else adns__debug(ads,-1,0,"environment variable %s set to `%s'",envvar,value);
656b2da9	389	return value;
	390	}
	391
36369543	392	static void readconfig(adns_state ads, const char *filename) {
	393	getline_ctx gl_ctx;
	394
	395	gl_ctx.file= fopen(filename,"r");
	396	if (!gl_ctx.file) {
	397	if (errno == ENOENT) {
	398	adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
	399	return;
	400	}
	401	saveerr(ads,errno);
	402	adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
	403	filename,strerror(errno));
	404	return;
	405	}
	406
	407	readconfiggeneric(ads,filename,gl_file,gl_ctx);
	408
	409	fclose(gl_ctx.file);
	410	}
	411
	412	static void readconfigtext(adns_state ads, const char text, const char showname) {
	413	getline_ctx gl_ctx;
	414
	415	gl_ctx.text= text;
	416	readconfiggeneric(ads,showname,gl_text,gl_ctx);
	417	}
	418
656b2da9	419	static void readconfigenv(adns_state ads, const char *envvar) {
	420	const char *filename;
	421
	422	if (ads->iflags & adns_if_noenv) {
3955725c	423	adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
656b2da9	424	return;
	425	}
	426	filename= instrum_getenv(ads,envvar);
	427	if (filename) readconfig(ads,filename);
	428	}
4353a5c4	429
09957b1c	430	static void readconfigenvtext(adns_state ads, const char *envvar) {
	431	const char *textdata;
	432
	433	if (ads->iflags & adns_if_noenv) {
	434	adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
	435	return;
	436	}
	437	textdata= instrum_getenv(ads,envvar);
	438	if (textdata) readconfigtext(ads,textdata,envvar);
	439	}
	440
4353a5c4	441
	442	int adns__setnonblock(adns_state ads, int fd) {
	443	int r;
656b2da9	444
4353a5c4	445	r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
	446	r \|= O_NONBLOCK;
	447	r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
	448	return 0;
	449	}
	450
36369543	451	static int init_begin(adns_state ads_r, adns_initflags flags, FILE diagfile) {
656b2da9	452	adns_state ads;
656b2da9	453
656b2da9	454	ads= malloc(sizeof(*ads)); if (!ads) return errno;
36369543	455
656b2da9	456	ads->iflags= flags;
36369543	457	ads->diagfile= diagfile;
d855b532	458	ads->configerrno= 0;
4353a5c4	459	LIST_INIT(ads->timew);
	460	LIST_INIT(ads->childw);
	461	LIST_INIT(ads->output);
8ce38e76	462	ads->forallnext= 0;
4353a5c4	463	ads->nextid= 0x311f;
4353a5c4	464	ads->udpsocket= ads->tcpsocket= -1;
4353a5c4	465	adns__vbuf_init(&ads->tcpsend);
4353a5c4	466	adns__vbuf_init(&ads->tcprecv);
32af6b2a	467	ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
660d7d3b	468	ads->searchndots= 1;
d855b532	469	ads->tcpstate= server_disconnected;
4353a5c4	470	timerclear(&ads->tcptimeout);
d855b532	471	ads->searchlist= 0;
656b2da9	472
36369543	473	*ads_r= ads;
	474	return 0;
	475	}
656b2da9	476
36369543	477	static int init_finish(adns_state ads) {
	478	struct in_addr ia;
	479	struct protoent *proto;
	480	int r;
	481
656b2da9	482	if (!ads->nservers) {
36369543	483	if (ads->diagfile && ads->iflags & adns_if_debug)
36369543	484	fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
09957b1c	485	ia.s_addr= htonl(INADDR_LOOPBACK);
656b2da9	486	addserver(ads,ia);
	487	}
	488
	489	proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
	490	ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
8402e34c	491	if (ads->udpsocket<0) { r= errno; goto x_free; }
4bec51a4	492
94436798	493	r= adns__setnonblock(ads,ads->udpsocket);
94436798	494	if (r) { r= errno; goto x_closeudp; }
656b2da9	495
656b2da9	496	return 0;
656b2da9	497
94436798	498	x_closeudp:
94436798	499	close(ads->udpsocket);
656b2da9	500	x_free:
	501	free(ads);
	502	return r;
	503	}
	504
32af6b2a	505	static void init_abort(adns_state ads) {
	506	if (ads->nsearchlist) {
	507	free(ads->searchlist[0]);
	508	free(ads->searchlist);
	509	}
	510	free(ads);
	511	}
	512
36369543	513	int adns_init(adns_state ads_r, adns_initflags flags, FILE diagfile) {
	514	adns_state ads;
	515	const char res_options, adns_res_options;
	516	int r;
	517
	518	r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
	519	if (r) return r;
	520
	521	res_options= instrum_getenv(ads,"RES_OPTIONS");
	522	adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
	523	ccf_options(ads,"RES_OPTIONS",-1,res_options);
	524	ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
	525
	526	readconfig(ads,"/etc/resolv.conf");
	527	readconfigenv(ads,"RES_CONF");
	528	readconfigenv(ads,"ADNS_RES_CONF");
	529
09957b1c	530	readconfigenvtext(ads,"RES_CONF_TEXT");
	531	readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
	532
36369543	533	ccf_options(ads,"RES_OPTIONS",-1,res_options);
	534	ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
	535
	536	ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
	537	ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
	538
32af6b2a	539	if (ads->configerrno && ads->configerrno != EINVAL) {
	540	r= ads->configerrno;
	541	init_abort(ads);
	542	return r;
	543	}
	544
36369543	545	r= init_finish(ads);
	546	if (r) return r;
	547
3e2e5fab	548	adns__consistency(ads,cc_entex);
36369543	549	*ads_r= ads;
	550	return 0;
	551	}
	552
	553	int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
	554	FILE diagfile, const char configtext) {
	555	adns_state ads;
	556	int r;
	557
	558	r= init_begin(&ads, flags, diagfile); if (r) return r;
	559
	560	readconfigtext(ads,configtext,"<supplied configuration text>");
	561	if (ads->configerrno) {
	562	r= ads->configerrno;
32af6b2a	563	init_abort(ads);
36369543	564	return r;
	565	}
	566
	567	r= init_finish(ads); if (r) return r;
3e2e5fab	568	adns__consistency(ads,cc_entex);
36369543	569	*ads_r= ads;
	570	return 0;
	571	}
	572
3e2e5fab	573
9ec44266	574	void adns_finish(adns_state ads) {
3e2e5fab	575	adns__consistency(ads,cc_entex);
9ec44266	576	for (;;) {
	577	if (ads->timew.head) adns_cancel(ads->timew.head);
	578	else if (ads->childw.head) adns_cancel(ads->childw.head);
	579	else if (ads->output.head) adns_cancel(ads->output.head);
	580	else break;
	581	}
	582	close(ads->udpsocket);
	583	if (ads->tcpsocket >= 0) close(ads->tcpsocket);
	584	adns__vbuf_free(&ads->tcpsend);
	585	adns__vbuf_free(&ads->tcprecv);
	586	free(ads);
656b2da9	587	}
8ce38e76	588
8ce38e76	589	void adns_forallqueries_begin(adns_state ads) {
3e2e5fab	590	adns__consistency(ads,cc_entex);
8ce38e76	591	ads->forallnext=
	592	ads->timew.head ? ads->timew.head :
	593	ads->childw.head ? ads->childw.head :
	594	ads->output.head;
	595	}
	596
	597	adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
	598	adns_query qu, nqu;
	599
3e2e5fab	600	adns__consistency(ads,cc_entex);
8ce38e76	601	nqu= ads->forallnext;
	602	for (;;) {
	603	qu= nqu;
	604	if (!qu) return 0;
4218fb9a	605	if (qu->next) {
	606	nqu= qu->next;
	607	} else if (qu == ads->timew.tail) {
	608	if (ads->childw.head) {
	609	nqu= ads->childw.head;
	610	} else {
	611	nqu= ads->output.head;
	612	}
	613	} else if (qu == ads->childw.tail) {
	614	nqu= ads->output.head;
	615	} else {
	616	nqu= 0;
	617	}
8ce38e76	618	if (!qu->parent) break;
	619	}
	620	ads->forallnext= nqu;
	621	if (context_r) *context_r= qu->ctx.ext;
	622	return qu;
	623	}
4218fb9a	624
4218fb9a	625	void adns__checkqueues(adns_state ads) {
4218fb9a	626	adns_forallqueries_begin(ads);
38b74824	627	while (adns_forallqueries_next(ads,0));
4218fb9a	628	}