[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 <string.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>

#include <netdb.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;
    }
    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;
  LIST_INIT(ads->timew);
  LIST_INIT(ads->childw);
  LIST_INIT(ads->output);
  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->tcpstate= server_disconnected;
  ads->searchlist= 0;
  ads->searchndots= 1;
  timerclear(&ads->tcptimeout);

  *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;

  *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;
  *ads_r= ads;
  return 0;
}

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