mdw@git.distorted.org.uk Git - adns/blob - client/adh-query.c

   1 /*
   2  * adh-query.c
   3  * - useful general-purpose resolver client program
   4  *   make queries and print answers
   5  */
   6 /*
   7  *  This file is
   8  *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  It is part of adns, which is
  11  *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
  12  *    Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
  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  */
  28
  29 #include "adnshost.h"
  30
  31 adns_state ads;
  32 struct outstanding_list outstanding;
  33
  34 static unsigned long idcounter;
  35
  36 void ensure_adns_init(void) {
  37   adns_initflags initflags;
  38   int r;
  39
  40   if (ads) return;
  41
  42   if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno);
  43
  44   initflags= adns_if_noautosys|adns_if_nosigpipe|ov_verbose;
  45   if (!ov_env) initflags |= adns_if_noenv;
  46
  47   if (config_text) {
  48     r= adns_init_strcfg(&ads, initflags, stderr, config_text);
  49   } else {
  50     r= adns_init(&ads, initflags, 0);
  51   }
  52   if (r) sysfail("adns_init",r);
  53
  54   if (ov_format == fmt_default)
  55     ov_format= ov_asynch ? fmt_asynch : fmt_simple;
  56 }
  57
  58 void type_info(adns_rrtype type, const char **typename_r,
  59                const void *datap, char **data_r) {
  60   static char buf[12];
  61   adns_status st;
  62
  63   st= adns_rr_info(type, typename_r, 0,0, datap,data_r);
  64   if (st == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
  65   assert(!st);
  66   if (typename_r && !*typename_r) {
  67     sprintf(buf,"TYPE%d", (int)(type & adns_rrt_typemask));
  68     *typename_r= buf;
  69   }
  70 }
  71
  72 static void prep_query(struct query_node **qun_r, int *quflags_r) {
  73   struct query_node *qun;
  74   char idbuf[20];
  75
  76   if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
  77   ensure_adns_init();
  78
  79   qun= malloc(sizeof(*qun));
  80   qun->pqfr= ov_pqfr;
  81   if (ov_id) {
  82     qun->id= xstrsave(ov_id);
  83   } else {
  84     sprintf(idbuf,"%lu",idcounter++);
  85     idcounter &= 0x0fffffffflu;
  86     qun->id= xstrsave(idbuf);
  87   }
  88
  89   *quflags_r=
  90     (ov_search ? adns_qf_search : 0) |
  91     (ov_tcp ? adns_qf_usevc : 0) |
  92     ((ov_pqfr.show_owner || ov_format == fmt_simple) ? adns_qf_owner : 0) |
  93     (ov_qc_query ? adns_qf_quoteok_query : 0) |
  94     (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
  95     (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
  96     ov_cname,
  97
  98   *qun_r= qun;
  99 }
 100
 101 void of_ptr(const struct optioninfo *oi, const char *arg, const char *arg2) {
 102   struct query_node *qun;
 103   int quflags, r;
 104   struct sockaddr_in sa;
 105
 106   memset(&sa,0,sizeof(sa));
 107   sa.sin_family= AF_INET;
 108   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
 109
 110   prep_query(&qun,&quflags);
 111   qun->owner= xstrsave(arg);
 112   r= adns_submit_reverse(ads,
 113                          (struct sockaddr*)&sa,
 114                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
 115                          quflags,
 116                          qun,
 117                          &qun->qu);
 118   if (r) sysfail("adns_submit_reverse",r);
 119
 120   LIST_LINK_TAIL(outstanding,qun);
 121 }
 122
 123 void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
 124   struct query_node *qun;
 125   int quflags, r;
 126   struct sockaddr_in sa;
 127
 128   memset(&sa,0,sizeof(sa));
 129   sa.sin_family= AF_INET;
 130   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
 131
 132   prep_query(&qun,&quflags);
 133   qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
 134   sprintf(qun->owner, "%s %s", arg,arg2);
 135   r= adns_submit_reverse_any(ads,
 136                              (struct sockaddr*)&sa, arg2,
 137                              ov_type == adns_r_none ? adns_r_txt : ov_type,
 138                              quflags,
 139                              qun,
 140                              &qun->qu);
 141   if (r) sysfail("adns_submit_reverse",r);
 142
 143   LIST_LINK_TAIL(outstanding,qun);
 144 }
 145
 146 void query_do(const char *domain) {
 147   struct query_node *qun;
 148   int quflags, r;
 149
 150   prep_query(&qun,&quflags);
 151   qun->owner= xstrsave(domain);
 152   r= adns_submit(ads, domain,
 153                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 154                  quflags,
 155                  qun,
 156                  &qun->qu);
 157   if (r) sysfail("adns_submit",r);
 158
 159   LIST_LINK_TAIL(outstanding,qun);
 160 }
 161
 162 static void dequeue_query(struct query_node *qun) {
 163   LIST_UNLINK(outstanding,qun);
 164   free(qun->id);
 165   free(qun->owner);
 166   free(qun);
 167 }
 168
 169 static void print_withspace(const char *str) {
 170   if (printf("%s ", str) == EOF) outerr();
 171 }
 172
 173 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 174   unsigned long ttl;
 175   time_t now;
 176
 177   switch (qun->pqfr.ttl) {
 178   case tm_none:
 179     return;
 180   case tm_rel:
 181     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 182     ttl= answer->expires < now ? 0 : answer->expires - now;
 183     break;
 184   case tm_abs:
 185     ttl= answer->expires;
 186     break;
 187   default:
 188     abort();
 189   }
 190   if (printf("%lu ",ttl) == EOF) outerr();
 191 }
 192
 193 static const char *owner_show(struct query_node *qun, adns_answer *answer) {
 194   return answer->owner ? answer->owner : qun->owner;
 195 }
 196
 197 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 198   if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
 199   print_ttl(qun,answer);
 200 }
 201
 202 static void check_status(adns_status st) {
 203   static const adns_status statuspoints[]= {
 204     adns_s_ok,
 205     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 206     adns_s_max_misconfig, adns_s_max_misquery
 207   };
 208
 209   const adns_status *spp;
 210   int minrcode;
 211
 212   for (minrcode=0, spp=statuspoints;
 213        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 214        spp++)
 215     if (st > *spp) minrcode++;
 216   if (rcode < minrcode) rcode= minrcode;
 217 }
 218
 219 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 220   const char *statustypeabbrev, *statusabbrev, *statusstring;
 221
 222   statustypeabbrev= adns_errtypeabbrev(st);
 223   statusabbrev= adns_errabbrev(st);
 224   statusstring= adns_strerror(st);
 225   assert(!strchr(statusstring,'"'));
 226
 227   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 228       == EOF) outerr();
 229   print_owner_ttl(qun,answer);
 230   if (qun->pqfr.show_cname)
 231     print_withspace(answer->cname ? answer->cname : "$");
 232   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 233 }
 234
 235 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 236   int r;
 237   const char *typename, *statusstring;
 238
 239   if (ov_format == fmt_inline) {
 240     if (fputs("; failed ",stdout) == EOF) outerr();
 241     print_status(st,qun,answer);
 242     return;
 243   }
 244   assert(ov_format == fmt_simple);
 245   if (st == adns_s_nxdomain) {
 246     r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
 247   } else {
 248     type_info(answer->type, &typename, 0,0);
 249     if (st == adns_s_nodata) {
 250       r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
 251     } else {
 252       statusstring= adns_strerror(st);
 253       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 254                  typename, owner_show(qun,answer), statusstring);
 255     }
 256   }
 257   if (r == EOF) sysfail("write error message to stderr",errno);
 258 }
 259
 260 void query_done(struct query_node *qun, adns_answer *answer) {
 261   adns_status st;
 262   int rrn, nrrs;
 263   const char *rrp, *realowner, *typename;
 264   char *datastr;
 265
 266   st= answer->status;
 267   nrrs= answer->nrrs;
 268   if (ov_format == fmt_asynch) {
 269     check_status(st);
 270     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 271     print_status(st,qun,answer);
 272   } else {
 273     if (qun->pqfr.show_cname && answer->cname) {
 274       print_owner_ttl(qun,answer);
 275       if (qun->pqfr.show_type) print_withspace("CNAME");
 276       if (printf("%s\n", answer->cname) == EOF) outerr();
 277     }
 278     if (st) {
 279       check_status(st);
 280       print_dnsfail(st,qun,answer);
 281     }
 282   }
 283   if (qun->pqfr.show_owner) {
 284     realowner= answer->cname ? answer->cname : owner_show(qun,answer);
 285     assert(realowner);
 286   } else {
 287     realowner= 0;
 288   }
 289   if (nrrs) {
 290     for (rrn=0, rrp = answer->rrs.untyped;
 291          rrn < nrrs;
 292          rrn++, rrp += answer->rrsz) {
 293       if (realowner) print_withspace(realowner);
 294       print_ttl(qun,answer);
 295       type_info(answer->type,&typename, rrp,&datastr);
 296       if (qun->pqfr.show_type) print_withspace(typename);
 297       if (printf("%s\n",datastr) == EOF) outerr();
 298       free(datastr);
 299     }
 300   }
 301   if (fflush(stdout)) outerr();
 302   free(answer);
 303   dequeue_query(qun);
 304 }
 305
 306 void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 307   free(ov_id);
 308   ov_id= xstrsave(arg);
 309 }
 310
 311 void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 312   struct query_node *qun;
 313
 314   for (qun= outstanding.head;
 315        qun && strcmp(qun->id,arg);
 316        qun= qun->next);
 317   if (!qun) return;
 318   adns_cancel(qun->qu);
 319   dequeue_query(qun);
 320 }