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) 1997-1999 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>
  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   int r;
  38
  39   if (ads) return;
  40
  41   if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno);
  42   r= adns_init(&ads,
  43                adns_if_noautosys|adns_if_nosigpipe |
  44                (ov_env ? 0 : adns_if_noenv) |
  45                ov_verbose,
  46                0);
  47   if (r) sysfail("adns_init",r);
  48
  49   if (ov_format == fmt_default)
  50     ov_format= ov_asynch ? fmt_asynch : fmt_simple;
  51 }
  52
  53 static void prep_query(struct query_node **qun_r, int *quflags_r) {
  54   struct query_node *qun;
  55   char idbuf[20];
  56
  57   if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
  58   ensure_adns_init();
  59
  60   qun= malloc(sizeof(*qun));
  61   qun->pqfr= ov_pqfr;
  62   if (ov_id) {
  63     qun->id= xstrsave(ov_id);
  64   } else {
  65     sprintf(idbuf,"%lu",idcounter++);
  66     idcounter &= 0x0fffffffflu;
  67     qun->id= xstrsave(idbuf);
  68   }
  69
  70   *quflags_r=
  71     (ov_search ? adns_qf_search : 0) |
  72     (ov_tcp ? adns_qf_usevc : 0) |
  73     ((ov_pqfr.show_owner || ov_format == fmt_simple) ? adns_qf_owner : 0) |
  74     (ov_qc_query ? adns_qf_quoteok_query : 0) |
  75     (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
  76     (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
  77     ov_cname,
  78
  79   *qun_r= qun;
  80 }
  81
  82 void of_ptr(const struct optioninfo *oi, const char *arg) {
  83   struct query_node *qun;
  84   int quflags, r;
  85   struct sockaddr_in sa;
  86
  87   memset(&sa,0,sizeof(sa));
  88   sa.sin_family= AF_INET;
  89   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
  90
  91   prep_query(&qun,&quflags);
  92   r= adns_submit_reverse(ads,
  93                          (struct sockaddr*)&sa,
  94                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
  95                          quflags,
  96                          qun,
  97                          &qun->qu);
  98   if (r) sysfail("adns_submit_reverse",r);
  99
 100   LIST_LINK_TAIL(outstanding,qun);
 101 }
 102
 103 void query_do(const char *domain) {
 104   struct query_node *qun;
 105   int quflags, r;
 106
 107   prep_query(&qun,&quflags);
 108   r= adns_submit(ads, domain,
 109                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 110                  quflags,
 111                  qun,
 112                  &qun->qu);
 113   if (r) sysfail("adns_submit",r);
 114
 115   LIST_LINK_TAIL(outstanding,qun);
 116 }
 117
 118 static void dequeue_query(struct query_node *qun) {
 119   LIST_UNLINK(outstanding,qun);
 120   free(qun->id);
 121   free(qun);
 122 }
 123
 124 static void print_withspace(const char *str) {
 125   if (printf("%s ", str) == EOF) outerr();
 126 }
 127
 128 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 129   unsigned long ttl;
 130   time_t now;
 131
 132   switch (qun->pqfr.ttl) {
 133   case tm_none:
 134     return;
 135   case tm_rel:
 136     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 137     ttl= answer->expires < now ? 0 : answer->expires - now;
 138     break;
 139   case tm_abs:
 140     ttl= answer->expires;
 141     break;
 142   default:
 143     abort();
 144   }
 145   if (printf("%lu ",ttl) == EOF) outerr();
 146 }
 147
 148 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 149   if (qun->pqfr.show_owner) print_withspace(answer->owner);
 150   print_ttl(qun,answer);
 151 }
 152
 153 static void check_status(adns_status st) {
 154   static const adns_status statuspoints[]= {
 155     adns_s_ok,
 156     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 157     adns_s_max_misconfig, adns_s_max_misquery
 158   };
 159
 160   const adns_status *spp;
 161   int minrcode;
 162
 163   for (minrcode=0, spp=statuspoints;
 164        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 165        spp++)
 166     if (st > *spp) minrcode++;
 167   if (rcode < minrcode) rcode= minrcode;
 168 }
 169
 170 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 171   const char *statustypeabbrev, *statusabbrev, *statusstring;
 172
 173   statustypeabbrev= adns_errtypeabbrev(st);
 174   statusabbrev= adns_errabbrev(st);
 175   statusstring= adns_strerror(st);
 176   assert(!strchr(statusstring,'"'));
 177
 178   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 179       == EOF) outerr();
 180   print_owner_ttl(qun,answer);
 181   if (qun->pqfr.show_cname)
 182     print_withspace(answer->cname ? answer->cname : "$");
 183   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 184 }
 185
 186 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 187   int r;
 188   const char *typename, *statusstring;
 189   adns_status ist;
 190
 191   if (ov_format == fmt_inline) {
 192     if (fputs("; failed ",stdout) == EOF) outerr();
 193     print_status(st,qun,answer);
 194     return;
 195   }
 196   assert(ov_format == fmt_simple);
 197   if (st == adns_s_nxdomain) {
 198     r= fprintf(stderr,"%s does not exist\n", answer->owner);
 199   } else {
 200     ist= adns_rr_info(answer->type, &typename, 0,0,0,0);
 201     if (st == adns_s_nodata) {
 202       r= fprintf(stderr,"%s has no %s record\n", answer->owner, typename);
 203     } else {
 204       statusstring= adns_strerror(st);
 205       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 206                  typename, answer->owner, statusstring);
 207     }
 208   }
 209   if (r == EOF) sysfail("write error message to stderr",errno);
 210 }
 211
 212 void query_done(struct query_node *qun, adns_answer *answer) {
 213   adns_status st, ist;
 214   int rrn, nrrs;
 215   const char *rrp, *realowner, *typename;
 216   char *datastr;
 217
 218   st= answer->status;
 219   nrrs= answer->nrrs;
 220   if (ov_format == fmt_asynch) {
 221     check_status(st);
 222     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 223     print_status(st,qun,answer);
 224   } else {
 225     if (qun->pqfr.show_cname && answer->cname) {
 226       print_owner_ttl(qun,answer);
 227       if (qun->pqfr.show_type) print_withspace("CNAME");
 228       if (printf("%s\n", answer->cname) == EOF) outerr();
 229     }
 230     if (st) {
 231       check_status(st);
 232       print_dnsfail(st,qun,answer);
 233     }
 234   }
 235   if (qun->pqfr.show_owner) {
 236     realowner= answer->cname ? answer->cname : answer->owner;
 237     assert(realowner);
 238   } else {
 239     realowner= 0;
 240   }
 241   if (nrrs) {
 242     for (rrn=0, rrp = answer->rrs.untyped;
 243          rrn < nrrs;
 244          rrn++, rrp += answer->rrsz) {
 245       if (realowner) print_withspace(realowner);
 246       print_ttl(qun,answer);
 247       ist= adns_rr_info(answer->type, &typename, 0, 0, rrp, &datastr);
 248       if (ist == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
 249       assert(!ist);
 250       if (qun->pqfr.show_type) print_withspace(typename);
 251       if (printf("%s\n",datastr) == EOF) outerr();
 252       free(datastr);
 253     }
 254   }
 255   if (fflush(stdout)) outerr();
 256   free(answer);
 257   dequeue_query(qun);
 258 }
 259
 260 void of_asynch_id(const struct optioninfo *oi, const char *arg) {
 261   free(ov_id);
 262   ov_id= xstrsave(arg);
 263 }
 264
 265 void of_cancel_id(const struct optioninfo *oi, const char *arg) {
 266   struct query_node *qun;
 267
 268   for (qun= outstanding.head;
 269        qun && strcmp(qun->id,arg);
 270        qun= qun->next);
 271   if (!qun) return;
 272   adns_cancel(qun->qu);
 273   dequeue_query(qun);
 274 }