[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 <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;
    }
    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->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->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);
}

void adns_forallqueries_begin(adns_state ads) {
  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;

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