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
  50 static void prep_query(struct query_node **qun_r, int *quflags_r) {
  51   struct query_node *qun;
  52   char idbuf[20];
  53
  54   if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
  55   ensure_adns_init();
  56
  57   qun= malloc(sizeof(*qun));
  58   qun->pqfr= ov_pqfr;
  59   if (ov_id) {
  60     qun->id= xstrsave(ov_id);
  61   } else {
  62     sprintf(idbuf,"%lu",idcounter++);
  63     idcounter &= 0x0fffffffflu;
  64     qun->id= xstrsave(idbuf);
  65   }
  66
  67   *quflags_r=
  68     (ov_search ? adns_qf_search : 0) |
  69     (ov_tcp ? adns_qf_usevc : 0) |
  70     (ov_pqfr.show_owner ? adns_qf_owner : 0) |
  71     (ov_qc_query ? adns_qf_quoteok_query : 0) |
  72     (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
  73     (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
  74     ov_cname,
  75
  76   *qun_r= qun;
  77 }
  78
  79 void of_ptr(const struct optioninfo *oi, const char *arg) {
  80   struct query_node *qun;
  81   int quflags, r;
  82   struct sockaddr_in sa;
  83
  84   memset(&sa,0,sizeof(sa));
  85   sa.sin_family= AF_INET;
  86   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
  87
  88   prep_query(&qun,&quflags);
  89   r= adns_submit_reverse(ads,
  90                          (struct sockaddr*)&sa,
  91                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
  92                          quflags,
  93                          qun,
  94                          &qun->qu);
  95   if (r) sysfail("adns_submit_reverse",r);
  96
  97   LIST_LINK_TAIL(outstanding,qun);
  98 }
  99
 100 void query_do(const char *domain) {
 101   struct query_node *qun;
 102   int quflags, r;
 103
 104   prep_query(&qun,&quflags);
 105   r= adns_submit(ads, domain,
 106                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 107                  quflags,
 108                  qun,
 109                  &qun->qu);
 110   if (r) sysfail("adns_submit",r);
 111
 112   LIST_LINK_TAIL(outstanding,qun);
 113 }
 114
 115 static void dequeue_query(struct query_node *qun) {
 116   LIST_UNLINK(outstanding,qun);
 117   free(qun->id);
 118   free(qun);
 119 }
 120
 121 static void print_withspace(const char *str) {
 122   if (printf("%s ", str) == EOF) outerr();
 123 }
 124
 125 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 126   unsigned long ttl;
 127   time_t now;
 128
 129   switch (qun->pqfr.ttl) {
 130   case tm_none:
 131     return;
 132   case tm_rel:
 133     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 134     ttl= answer->expires < now ? 0 : answer->expires - now;
 135     break;
 136   case tm_abs:
 137     ttl= answer->expires;
 138     break;
 139   default:
 140     abort();
 141   }
 142   if (printf("%lu ",ttl) == EOF) outerr();
 143 }
 144
 145 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 146   if (qun->pqfr.show_owner) print_withspace(answer->owner);
 147   print_ttl(qun,answer);
 148 }
 149
 150 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 151   static const adns_status statuspoints[]= {
 152     adns_s_ok,
 153     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 154     adns_s_max_misconfig, adns_s_max_misquery
 155   };
 156
 157   const adns_status *spp;
 158   const char *statustypeabbrev, *statusabbrev, *statusstring;
 159   int minrcode;
 160
 161   statustypeabbrev= adns_errtypeabbrev(st);
 162   for (minrcode=0, spp=statuspoints;
 163        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 164        spp++)
 165     if (st > *spp) minrcode++;
 166   if (rcode < minrcode) rcode= minrcode;
 167
 168   statusabbrev= adns_errabbrev(st);
 169   statusstring= adns_strerror(st);
 170   assert(!strchr(statusstring,'"'));
 171
 172   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 173       == EOF) outerr();
 174   print_owner_ttl(qun,answer);
 175   if (qun->pqfr.show_cname)
 176     print_withspace(answer->cname ? answer->cname : "$");
 177   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 178 }
 179
 180 void query_done(struct query_node *qun, adns_answer *answer) {
 181   adns_status st, ist;
 182   int rrn, nrrs;
 183   const char *rrp, *realowner, *typename;
 184   char *datastr;
 185
 186   st= answer->status;
 187   nrrs= answer->nrrs;
 188   if (ov_asynch) {
 189     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 190     print_status(st,qun,answer);
 191   } else {
 192     if (st) {
 193       if (fputs("; failed ",stdout) == EOF) outerr();
 194       print_status(st,qun,answer);
 195     } else if (qun->pqfr.show_cname && answer->cname) {
 196       print_owner_ttl(qun,answer);
 197       if (printf("CNAME %s\n",answer->cname) == EOF) outerr();
 198     }
 199   }
 200   if (qun->pqfr.show_owner) {
 201     realowner= answer->cname ? answer->cname : answer->owner;
 202     assert(realowner);
 203   } else {
 204     realowner= 0;
 205   }
 206   if (nrrs) {
 207     for (rrn=0, rrp = answer->rrs.untyped;
 208          rrn < nrrs;
 209          rrn++, rrp += answer->rrsz) {
 210       if (realowner) print_withspace(realowner);
 211       print_ttl(qun,answer);
 212       ist= adns_rr_info(answer->type, &typename, 0, 0, rrp, &datastr);
 213       if (ist == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
 214       assert(!ist);
 215       if (qun->pqfr.show_type) print_withspace(typename);
 216       if (printf("%s\n",datastr) == EOF) outerr();
 217       free(datastr);
 218     }
 219   }
 220   if (fflush(stdout)) outerr();
 221   free(answer);
 222   dequeue_query(qun);
 223 }
 224
 225 void of_asynch_id(const struct optioninfo *oi, const char *arg) {
 226   free(ov_id);
 227   ov_id= xstrsave(arg);
 228 }
 229
 230 void of_cancel_id(const struct optioninfo *oi, const char *arg) {
 231   struct query_node *qun;
 232
 233   for (qun= outstanding.head;
 234        qun && strcmp(qun->id,arg);
 235        qun= qun->next);
 236   if (!qun) return;
 237   adns_cancel(qun->qu);
 238   dequeue_query(qun);
 239 }