[adns] / src / setup.c

/*
 * setup.c
 * - configuration file parsing
 * - management of global state
 */
/*
 *  This file is
 *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
 *
 *  It is part of adns, which is
 *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
 *    Copyright (C) 1999 Tony Finch <dot@dotat.at>
 *  
 *  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->tcprecv_skip= 0;
  ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
  ads->searchndots= 1;
  ads->tcpstate= server_disconnected;
  timerclear(&ads->tcptimeout);
  ads->searchlist= 0;

  *ads_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, int 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,0,cc_entex);
  *ads_r= ads;
  return 0;
}

int adns_init_strcfg(adns_state *ads_r, int 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,0,cc_entex);
  *ads_r= ads;
  return 0;
}


void adns_finish(adns_state ads) {
  adns__consistency(ads,0,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,0,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,0,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
98db6da3	1	/*
	2	* setup.c
	3	* - configuration file parsing
	4	* - management of global state
	5	*/
	6	/*
a79ac5ba	7	* This file is
	8	* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
	9	*
	10	* It is part of adns, which is
	11	* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
	12	* Copyright (C) 1999 Tony Finch <dot@dotat.at>
98db6da3	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2, or (at your option)
	17	* any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
6f17710a	28
d05cc330	29	#include <stdlib.h>
d05cc330	30	#include <errno.h>
7ca1d685	31	#include <limits.h>
d05cc330	32	#include <unistd.h>
d05cc330	33	#include <fcntl.h>
6f17710a	34
d05cc330	35	#include <netdb.h>
763d28b9	36	#include <sys/socket.h>
763d28b9	37	#include <netinet/in.h>
d05cc330	38	#include <arpa/inet.h>
	39
	40	#include "internal.h"
	41
d6b271ae	42	static void readconfig(adns_state ads, const char *filename);
d6b271ae	43
6f17710a	44	static void addserver(adns_state ads, struct in_addr addr) {
	45	int i;
	46	struct server *ss;
	47
	48	for (i=0; i<ads->nservers; i++) {
	49	if (ads->servers[i].addr.s_addr == addr.s_addr) {
11c8bf9b	50	adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
6f17710a	51	return;
	52	}
	53	}
	54
	55	if (ads->nservers>=MAXSERVERS) {
11c8bf9b	56	adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
6f17710a	57	return;
	58	}
	59
	60	ss= ads->servers+ads->nservers;
	61	ss->addr= addr;
6f17710a	62	ads->nservers++;
	63	}
	64
d6b271ae	65	static void saveerr(adns_state ads, int en) {
	66	if (!ads->configerrno) ads->configerrno= en;
	67	}
	68
6f17710a	69	static void configparseerr(adns_state ads, const char *fn, int lno,
	70	const char *fmt, ...) {
	71	va_list al;
d6b271ae	72
	73	saveerr(ads,EINVAL);
	74	if (!ads->diagfile \|\| (ads->iflags & adns_if_noerrprint)) return;
	75
	76	if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
	77	else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
6f17710a	78	va_start(al,fmt);
d6b271ae	79	vfprintf(ads->diagfile,fmt,al);
6f17710a	80	va_end(al);
d6b271ae	81	fputc('\n',ads->diagfile);
6f17710a	82	}
6f17710a	83
11f553d9	84	static int nextword(const char bufp_io, const char word_r, int *l_r) {
	85	const char p, q;
	86
	87	p= *bufp_io;
	88	while (ctype_whitespace(*p)) p++;
	89	if (!*p) return 0;
	90
	91	q= p;
	92	while (q && !ctype_whitespace(q)) q++;
	93
	94	*l_r= q-p;
	95	*word_r= p;
	96	*bufp_io= q;
	97
	98	return 1;
	99	}
	100
6f17710a	101	static void ccf_nameserver(adns_state ads, const char fn, int lno, const char buf) {
	102	struct in_addr ia;
	103
	104	if (!inet_aton(buf,&ia)) {
	105	configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
	106	return;
	107	}
11c8bf9b	108	adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
6f17710a	109	addserver(ads,ia);
	110	}
	111
	112	static void ccf_search(adns_state ads, const char fn, int lno, const char buf) {
11f553d9	113	const char bufp, word;
	114	char newchars, newptrs, *pp;
	115	int count, tl, l;
	116
6f17710a	117	if (!buf) return;
11f553d9	118
	119	bufp= buf;
	120	count= 0;
	121	tl= 0;
	122	while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
	123
	124	newptrs= malloc(sizeof(char)count); if (!newptrs) { saveerr(ads,errno); return; }
	125	newchars= malloc(tl); if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
	126
	127	bufp= buf;
	128	pp= newptrs;
	129	while (nextword(&bufp,&word,&l)) {
	130	*pp++= newchars;
	131	memcpy(newchars,word,l);
	132	newchars += l;
	133	*newchars++ = 0;
	134	}
	135
	136	free(ads->searchlist);
	137	ads->nsearchlist= count;
	138	ads->searchlist= newptrs;
6f17710a	139	}
6f17710a	140
11f553d9	141	static void ccf_sortlist(adns_state ads, const char fn, int lno, const char buf) {
11f553d9	142	const char *word;
8c3aa944	143	char tbuf[200], slash, ep;
	144	struct in_addr base, mask;
	145	int l;
	146	unsigned long initial, baselocal;
	147
11f553d9	148	if (!buf) return;
11f553d9	149
8c3aa944	150	ads->nsortlist= 0;
11f553d9	151	while (nextword(&buf,&word,&l)) {
8c3aa944	152	if (ads->nsortlist >= MAXSORTLIST) {
11f553d9	153	adns__diag(ads,-1,0,"too many sortlist entries, ignoring %.*s onwards",l,word);
8c3aa944	154	return;
	155	}
	156
	157	if (l >= sizeof(tbuf)) {
11f553d9	158	configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
8c3aa944	159	continue;
	160	}
	161
7ca1d685	162	memcpy(tbuf,word,l); tbuf[l]= 0;
8c3aa944	163	slash= strchr(tbuf,'/');
	164	if (slash) *slash++= 0;
	165
	166	if (!inet_aton(tbuf,&base)) {
	167	configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
	168	continue;
	169	}
	170
	171	if (slash) {
	172	if (strchr(slash,'.')) {
	173	if (!inet_aton(slash,&mask)) {
	174	configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
	175	continue;
	176	}
	177	if (base.s_addr & ~mask.s_addr) {
	178	configparseerr(ads,fn,lno,
	179	"mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
	180	continue;
	181	}
	182	} else {
	183	initial= strtoul(slash,&ep,10);
	184	if (*ep \|\| initial>32) {
	185	configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
	186	continue;
	187	}
	188	mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
	189	}
	190	} else {
	191	baselocal= ntohl(base.s_addr);
	192	if (!baselocal & 0x080000000UL) /* class A */
	193	mask.s_addr= htonl(0x0ff000000UL);
	194	else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
	195	mask.s_addr= htonl(0x0ffff0000UL); /* class B */
	196	else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
	197	mask.s_addr= htonl(0x0ff000000UL); /* class C */
	198	else {
	199	configparseerr(ads,fn,lno,
	200	"network address `%s' in sortlist is not in classed ranges,"
	201	" must specify mask explicitly", tbuf);
	202	continue;
	203	}
	204	}
	205
	206	ads->sortlist[ads->nsortlist].base= base;
	207	ads->sortlist[ads->nsortlist].mask= mask;
	208	ads->nsortlist++;
	209	}
6f17710a	210	}
	211
	212	static void ccf_options(adns_state ads, const char fn, int lno, const char buf) {
7ca1d685	213	const char *word;
	214	char *ep;
	215	unsigned long v;
	216	int l;
	217
6f17710a	218	if (!buf) return;
7ca1d685	219
	220	while (nextword(&buf,&word,&l)) {
	221	if (l==5 && !memcmp(word,"debug",5)) {
	222	ads->iflags \|= adns_if_debug;
	223	continue;
	224	}
	225	if (l>=6 && !memcmp(word,"ndots:",6)) {
	226	v= strtoul(word+6,&ep,10);
	227	if (l==6 \|\| ep != word+l \|\| v > INT_MAX) {
	228	configparseerr(ads,fn,lno,"option `%.*s' malformed or has bad value",l,word);
	229	continue;
	230	}
	231	ads->searchndots= v;
	232	continue;
	233	}
1389dc72	234	if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
	235	if (!strcmp(word+12,"none")) {
	236	ads->iflags &= ~adns_if_checkc_freq;
	237	ads->iflags \|= adns_if_checkc_entex;
	238	} else if (!strcmp(word+12,"entex")) {
	239	ads->iflags &= ~adns_if_checkc_freq;
	240	ads->iflags \|= adns_if_checkc_entex;
	241	} else if (!strcmp(word+12,"freq")) {
	242	ads->iflags \|= adns_if_checkc_freq;
	243	} else {
	244	configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
	245	"(must be none, entex or freq", word+12);
	246	}
	247	continue;
	248	}
7ca1d685	249	adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
7ca1d685	250	}
6f17710a	251	}
	252
	253	static void ccf_clearnss(adns_state ads, const char fn, int lno, const char buf) {
	254	ads->nservers= 0;
	255	}
	256
d6b271ae	257	static void ccf_include(adns_state ads, const char fn, int lno, const char buf) {
	258	if (!*buf) {
	259	configparseerr(ads,fn,lno,"`include' directive with no filename");
	260	return;
	261	}
	262	readconfig(ads,buf);
	263	}
	264
6f17710a	265	static const struct configcommandinfo {
	266	const char *name;
	267	void (fn)(adns_state ads, const char fn, int lno, const char *buf);
	268	} configcommandinfos[]= {
	269	{ "nameserver", ccf_nameserver },
	270	{ "domain", ccf_search },
	271	{ "search", ccf_search },
	272	{ "sortlist", ccf_sortlist },
	273	{ "options", ccf_options },
	274	{ "clearnameservers", ccf_clearnss },
d6b271ae	275	{ "include", ccf_include },
6f17710a	276	{ 0 }
	277	};
	278
d6b271ae	279	typedef union {
6f17710a	280	FILE *file;
d6b271ae	281	const char *text;
d6b271ae	282	} getline_ctx;
6f17710a	283
d6b271ae	284	static int gl_file(adns_state ads, getline_ctx src_io, const char filename,
	285	int lno, char *buf, int buflen) {
	286	FILE *file= src_io->file;
	287	int c, i;
	288	char *p;
	289
	290	p= buf;
	291	buflen--;
	292	i= 0;
	293
	294	for (;;) { /* loop over chars */
	295	if (i == buflen) {
	296	adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
	297	goto x_badline;
	298	}
	299	c= getc(file);
	300	if (!c) {
	301	adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
	302	goto x_badline;
	303	} else if (c == '\n') {
	304	break;
	305	} else if (c == EOF) {
	306	if (ferror(file)) {
	307	saveerr(ads,errno);
	308	adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
	309	return -1;
	310	}
	311	if (!i) return -1;
	312	break;
	313	} else {
	314	*p++= c;
	315	i++;
6f17710a	316	}
6f17710a	317	}
6f17710a	318
d6b271ae	319	*p++= 0;
	320	return i;
	321
	322	x_badline:
	323	saveerr(ads,EINVAL);
	324	while ((c= getc(file)) != EOF && c != '\n');
	325	return -2;
	326	}
	327
	328	static int gl_text(adns_state ads, getline_ctx src_io, const char filename,
	329	int lno, char *buf, int buflen) {
8c3aa944	330	const char *cp= src_io->text;
d6b271ae	331	int l;
d6b271ae	332
8c3aa944	333	if (!cp \|\| !*cp) return -1;
d6b271ae	334
8c3aa944	335	if (cp == ';' \|\| cp == '\n') cp++;
	336	l= strcspn(cp,";\n");
	337	src_io->text = cp+l;
d6b271ae	338
	339	if (l >= buflen) {
	340	adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
	341	saveerr(ads,EINVAL);
	342	return -2;
	343	}
	344
	345	memcpy(buf,cp,l);
	346	buf[l]= 0;
	347	return l;
	348	}
	349
	350	static void readconfiggeneric(adns_state ads, const char *filename,
	351	int (getline)(adns_state ads, getline_ctx,
	352	const char *filename, int lno,
	353	char *buf, int buflen),
	354	/* Returns >=0 for success, -1 for EOF or error
	355	* (error will have been reported), or -2 for
	356	* bad line was encountered, try again.
	357	*/
	358	getline_ctx gl_ctx) {
	359	char linebuf[2000], p, q;
	360	int lno, l, dirl;
	361	const struct configcommandinfo *ccip;
	362
	363	for (lno=1;
	364	(l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
	365	lno++) {
	366	if (l == -2) continue;
6f17710a	367	while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
	368	linebuf[l]= 0;
	369	p= linebuf;
	370	while (ctype_whitespace(*p)) p++;
d6b271ae	371	if (p == '#' \|\| !p) continue;
6f17710a	372	q= p;
6f17710a	373	while (q && !ctype_whitespace(q)) q++;
d6b271ae	374	dirl= q-p;
6f17710a	375	for (ccip=configcommandinfos;
d6b271ae	376	ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
6f17710a	377	ccip++);
6f17710a	378	if (!ccip->name) {
11c8bf9b	379	adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
d05cc330	380	filename,lno,q-p,p);
6f17710a	381	continue;
	382	}
	383	while (ctype_whitespace(*q)) q++;
	384	ccip->fn(ads,filename,lno,q);
	385	}
6f17710a	386	}
	387
	388	static const char instrum_getenv(adns_state ads, const char envvar) {
	389	const char *value;
	390
	391	value= getenv(envvar);
11c8bf9b	392	if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
11c8bf9b	393	else adns__debug(ads,-1,0,"environment variable %s set to `%s'",envvar,value);
6f17710a	394	return value;
	395	}
	396
d6b271ae	397	static void readconfig(adns_state ads, const char *filename) {
	398	getline_ctx gl_ctx;
	399
	400	gl_ctx.file= fopen(filename,"r");
	401	if (!gl_ctx.file) {
	402	if (errno == ENOENT) {
	403	adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
	404	return;
	405	}
	406	saveerr(ads,errno);
	407	adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
	408	filename,strerror(errno));
	409	return;
	410	}
	411
	412	readconfiggeneric(ads,filename,gl_file,gl_ctx);
	413
	414	fclose(gl_ctx.file);
	415	}
	416
	417	static void readconfigtext(adns_state ads, const char text, const char showname) {
	418	getline_ctx gl_ctx;
	419
	420	gl_ctx.text= text;
	421	readconfiggeneric(ads,showname,gl_text,gl_ctx);
	422	}
	423
6f17710a	424	static void readconfigenv(adns_state ads, const char *envvar) {
	425	const char *filename;
	426
	427	if (ads->iflags & adns_if_noenv) {
11c8bf9b	428	adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
6f17710a	429	return;
	430	}
	431	filename= instrum_getenv(ads,envvar);
	432	if (filename) readconfig(ads,filename);
	433	}
d05cc330	434
8c3aa944	435	static void readconfigenvtext(adns_state ads, const char *envvar) {
	436	const char *textdata;
	437
	438	if (ads->iflags & adns_if_noenv) {
	439	adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
	440	return;
	441	}
	442	textdata= instrum_getenv(ads,envvar);
	443	if (textdata) readconfigtext(ads,textdata,envvar);
	444	}
	445
d05cc330	446
	447	int adns__setnonblock(adns_state ads, int fd) {
	448	int r;
6f17710a	449
d05cc330	450	r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
	451	r \|= O_NONBLOCK;
	452	r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
	453	return 0;
	454	}
	455
d6b271ae	456	static int init_begin(adns_state ads_r, adns_initflags flags, FILE diagfile) {
6f17710a	457	adns_state ads;
6f17710a	458
6f17710a	459	ads= malloc(sizeof(*ads)); if (!ads) return errno;
d6b271ae	460
6f17710a	461	ads->iflags= flags;
d6b271ae	462	ads->diagfile= diagfile;
7def4935	463	ads->configerrno= 0;
d05cc330	464	LIST_INIT(ads->timew);
	465	LIST_INIT(ads->childw);
	466	LIST_INIT(ads->output);
8f2aa812	467	ads->forallnext= 0;
d05cc330	468	ads->nextid= 0x311f;
d05cc330	469	ads->udpsocket= ads->tcpsocket= -1;
d05cc330	470	adns__vbuf_init(&ads->tcpsend);
d05cc330	471	adns__vbuf_init(&ads->tcprecv);
ab898cf4	472	ads->tcprecv_skip= 0;
11f553d9	473	ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
7e6a84a1	474	ads->searchndots= 1;
7def4935	475	ads->tcpstate= server_disconnected;
d05cc330	476	timerclear(&ads->tcptimeout);
7def4935	477	ads->searchlist= 0;
6f17710a	478
d6b271ae	479	*ads_r= ads;
	480	return 0;
	481	}
6f17710a	482
d6b271ae	483	static int init_finish(adns_state ads) {
	484	struct in_addr ia;
	485	struct protoent *proto;
	486	int r;
	487
6f17710a	488	if (!ads->nservers) {
d6b271ae	489	if (ads->diagfile && ads->iflags & adns_if_debug)
d6b271ae	490	fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
8c3aa944	491	ia.s_addr= htonl(INADDR_LOOPBACK);
6f17710a	492	addserver(ads,ia);
	493	}
	494
	495	proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
	496	ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
71324651	497	if (ads->udpsocket<0) { r= errno; goto x_free; }
48cb0b4b	498
de8b18da	499	r= adns__setnonblock(ads,ads->udpsocket);
de8b18da	500	if (r) { r= errno; goto x_closeudp; }
6f17710a	501
6f17710a	502	return 0;
6f17710a	503
de8b18da	504	x_closeudp:
de8b18da	505	close(ads->udpsocket);
6f17710a	506	x_free:
	507	free(ads);
	508	return r;
	509	}
	510
11f553d9	511	static void init_abort(adns_state ads) {
	512	if (ads->nsearchlist) {
	513	free(ads->searchlist[0]);
	514	free(ads->searchlist);
	515	}
	516	free(ads);
	517	}
	518
2277ca1a	519	int adns_init(adns_state ads_r, int flags, FILE diagfile) {
d6b271ae	520	adns_state ads;
	521	const char res_options, adns_res_options;
	522	int r;
	523
	524	r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
	525	if (r) return r;
	526
	527	res_options= instrum_getenv(ads,"RES_OPTIONS");
	528	adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
	529	ccf_options(ads,"RES_OPTIONS",-1,res_options);
	530	ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
	531
	532	readconfig(ads,"/etc/resolv.conf");
	533	readconfigenv(ads,"RES_CONF");
	534	readconfigenv(ads,"ADNS_RES_CONF");
	535
8c3aa944	536	readconfigenvtext(ads,"RES_CONF_TEXT");
	537	readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
	538
d6b271ae	539	ccf_options(ads,"RES_OPTIONS",-1,res_options);
	540	ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
	541
	542	ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
	543	ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
	544
11f553d9	545	if (ads->configerrno && ads->configerrno != EINVAL) {
	546	r= ads->configerrno;
	547	init_abort(ads);
	548	return r;
	549	}
	550
d6b271ae	551	r= init_finish(ads);
	552	if (r) return r;
	553
2ac463bf	554	adns__consistency(ads,0,cc_entex);
d6b271ae	555	*ads_r= ads;
	556	return 0;
	557	}
	558
2277ca1a	559	int adns_init_strcfg(adns_state *ads_r, int flags,
d6b271ae	560	FILE diagfile, const char configtext) {
	561	adns_state ads;
	562	int r;
	563
	564	r= init_begin(&ads, flags, diagfile); if (r) return r;
	565
	566	readconfigtext(ads,configtext,"<supplied configuration text>");
	567	if (ads->configerrno) {
	568	r= ads->configerrno;
11f553d9	569	init_abort(ads);
d6b271ae	570	return r;
	571	}
	572
	573	r= init_finish(ads); if (r) return r;
2ac463bf	574	adns__consistency(ads,0,cc_entex);
d6b271ae	575	*ads_r= ads;
	576	return 0;
	577	}
	578
1389dc72	579
61093792	580	void adns_finish(adns_state ads) {
2ac463bf	581	adns__consistency(ads,0,cc_entex);
61093792	582	for (;;) {
	583	if (ads->timew.head) adns_cancel(ads->timew.head);
	584	else if (ads->childw.head) adns_cancel(ads->childw.head);
	585	else if (ads->output.head) adns_cancel(ads->output.head);
	586	else break;
	587	}
	588	close(ads->udpsocket);
	589	if (ads->tcpsocket >= 0) close(ads->tcpsocket);
	590	adns__vbuf_free(&ads->tcpsend);
	591	adns__vbuf_free(&ads->tcprecv);
	592	free(ads);
6f17710a	593	}
8f2aa812	594
8f2aa812	595	void adns_forallqueries_begin(adns_state ads) {
2ac463bf	596	adns__consistency(ads,0,cc_entex);
8f2aa812	597	ads->forallnext=
	598	ads->timew.head ? ads->timew.head :
	599	ads->childw.head ? ads->childw.head :
	600	ads->output.head;
	601	}
	602
	603	adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
	604	adns_query qu, nqu;
	605
2ac463bf	606	adns__consistency(ads,0,cc_entex);
8f2aa812	607	nqu= ads->forallnext;
	608	for (;;) {
	609	qu= nqu;
	610	if (!qu) return 0;
cb32030b	611	if (qu->next) {
	612	nqu= qu->next;
	613	} else if (qu == ads->timew.tail) {
	614	if (ads->childw.head) {
	615	nqu= ads->childw.head;
	616	} else {
	617	nqu= ads->output.head;
	618	}
	619	} else if (qu == ads->childw.tail) {
	620	nqu= ads->output.head;
	621	} else {
	622	nqu= 0;
	623	}
8f2aa812	624	if (!qu->parent) break;
	625	}
	626	ads->forallnext= nqu;
	627	if (context_r) *context_r= qu->ctx.ext;
	628	return qu;
	629	}
cb32030b	630
cb32030b	631	void adns__checkqueues(adns_state ads) {
cb32030b	632	adns_forallqueries_begin(ads);
46c6c5f9	633	while (adns_forallqueries_next(ads,0));
cb32030b	634	}