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, const char *arg2) {
  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   qun->owner= xstrsave(arg);
  93   r= adns_submit_reverse(ads,
  94                          (struct sockaddr*)&sa,
  95                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
  96                          quflags,
  97                          qun,
  98                          &qun->qu);
  99   if (r) sysfail("adns_submit_reverse",r);
 100
 101   LIST_LINK_TAIL(outstanding,qun);
 102 }
 103
 104 void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
 105   struct query_node *qun;
 106   int quflags, r;
 107   struct sockaddr_in sa;
 108
 109   memset(&sa,0,sizeof(sa));
 110   sa.sin_family= AF_INET;
 111   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
 112
 113   prep_query(&qun,&quflags);
 114   qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
 115   sprintf(qun->owner, "%s %s", arg,arg2);
 116   r= adns_submit_reverse_any(ads,
 117                              (struct sockaddr*)&sa, arg2,
 118                              ov_type == adns_r_none ? adns_r_txt : ov_type,
 119                              quflags,
 120                              qun,
 121                              &qun->qu);
 122   if (r) sysfail("adns_submit_reverse",r);
 123
 124   LIST_LINK_TAIL(outstanding,qun);
 125 }
 126
 127 void query_do(const char *domain) {
 128   struct query_node *qun;
 129   int quflags, r;
 130
 131   prep_query(&qun,&quflags);
 132   qun->owner= xstrsave(domain);
 133   r= adns_submit(ads, domain,
 134                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 135                  quflags,
 136                  qun,
 137                  &qun->qu);
 138   if (r) sysfail("adns_submit",r);
 139
 140   LIST_LINK_TAIL(outstanding,qun);
 141 }
 142
 143 static void dequeue_query(struct query_node *qun) {
 144   LIST_UNLINK(outstanding,qun);
 145   free(qun->id);
 146   free(qun);
 147 }
 148
 149 static void print_withspace(const char *str) {
 150   if (printf("%s ", str) == EOF) outerr();
 151 }
 152
 153 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 154   unsigned long ttl;
 155   time_t now;
 156
 157   switch (qun->pqfr.ttl) {
 158   case tm_none:
 159     return;
 160   case tm_rel:
 161     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 162     ttl= answer->expires < now ? 0 : answer->expires - now;
 163     break;
 164   case tm_abs:
 165     ttl= answer->expires;
 166     break;
 167   default:
 168     abort();
 169   }
 170   if (printf("%lu ",ttl) == EOF) outerr();
 171 }
 172
 173 static const char *owner_show(struct query_node *qun, adns_answer *answer) {
 174   return answer->owner ? answer->owner : qun->owner;
 175 }
 176
 177 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 178   if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
 179   print_ttl(qun,answer);
 180 }
 181
 182 static void check_status(adns_status st) {
 183   static const adns_status statuspoints[]= {
 184     adns_s_ok,
 185     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 186     adns_s_max_misconfig, adns_s_max_misquery
 187   };
 188
 189   const adns_status *spp;
 190   int minrcode;
 191
 192   for (minrcode=0, spp=statuspoints;
 193        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 194        spp++)
 195     if (st > *spp) minrcode++;
 196   if (rcode < minrcode) rcode= minrcode;
 197 }
 198
 199 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 200   const char *statustypeabbrev, *statusabbrev, *statusstring;
 201
 202   statustypeabbrev= adns_errtypeabbrev(st);
 203   statusabbrev= adns_errabbrev(st);
 204   statusstring= adns_strerror(st);
 205   assert(!strchr(statusstring,'"'));
 206
 207   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 208       == EOF) outerr();
 209   print_owner_ttl(qun,answer);
 210   if (qun->pqfr.show_cname)
 211     print_withspace(answer->cname ? answer->cname : "$");
 212   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 213 }
 214
 215 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 216   int r;
 217   const char *typename, *statusstring;
 218   adns_status ist;
 219
 220   if (ov_format == fmt_inline) {
 221     if (fputs("; failed ",stdout) == EOF) outerr();
 222     print_status(st,qun,answer);
 223     return;
 224   }
 225   assert(ov_format == fmt_simple);
 226   if (st == adns_s_nxdomain) {
 227     r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
 228   } else {
 229     ist= adns_rr_info(answer->type, &typename, 0,0,0,0);
 230     if (st == adns_s_nodata) {
 231       r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
 232     } else {
 233       statusstring= adns_strerror(st);
 234       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 235                  typename, owner_show(qun,answer), statusstring);
 236     }
 237   }
 238   if (r == EOF) sysfail("write error message to stderr",errno);
 239 }
 240
 241 void query_done(struct query_node *qun, adns_answer *answer) {
 242   adns_status st, ist;
 243   int rrn, nrrs;
 244   const char *rrp, *realowner, *typename;
 245   char *datastr;
 246
 247   st= answer->status;
 248   nrrs= answer->nrrs;
 249   if (ov_format == fmt_asynch) {
 250     check_status(st);
 251     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 252     print_status(st,qun,answer);
 253   } else {
 254     if (qun->pqfr.show_cname && answer->cname) {
 255       print_owner_ttl(qun,answer);
 256       if (qun->pqfr.show_type) print_withspace("CNAME");
 257       if (printf("%s\n", answer->cname) == EOF) outerr();
 258     }
 259     if (st) {
 260       check_status(st);
 261       print_dnsfail(st,qun,answer);
 262     }
 263   }
 264   if (qun->pqfr.show_owner) {
 265     realowner= answer->cname ? answer->cname : owner_show(qun,answer);
 266     assert(realowner);
 267   } else {
 268     realowner= 0;
 269   }
 270   if (nrrs) {
 271     for (rrn=0, rrp = answer->rrs.untyped;
 272          rrn < nrrs;
 273          rrn++, rrp += answer->rrsz) {
 274       if (realowner) print_withspace(realowner);
 275       print_ttl(qun,answer);
 276       ist= adns_rr_info(answer->type, &typename, 0, 0, rrp, &datastr);
 277       if (ist == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
 278       assert(!ist);
 279       if (qun->pqfr.show_type) print_withspace(typename);
 280       if (printf("%s\n",datastr) == EOF) outerr();
 281       free(datastr);
 282     }
 283   }
 284   if (fflush(stdout)) outerr();
 285   free(answer);
 286   dequeue_query(qun);
 287 }
 288
 289 void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 290   free(ov_id);
 291   ov_id= xstrsave(arg);
 292 }
 293
 294 void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 295   struct query_node *qun;
 296
 297   for (qun= outstanding.head;
 298        qun && strcmp(qun->id,arg);
 299        qun= qun->next);
 300   if (!qun) return;
 301   adns_cancel(qun->qu);
 302   dequeue_query(qun);
 303 }