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 part of adns, which is
   8  *    Copyright (C) 1997-2000,2003,2006,2014-2016  Ian Jackson
   9  *    Copyright (C) 2014  Mark Wooding
  10  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  11  *    Copyright (C) 1991 Massachusetts Institute of Technology
  12  *  (See the file INSTALL for full details.)
  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 3, 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  */
  27
  28 #include "adnshost.h"
  29
  30 adns_state ads;
  31 struct outstanding_list outstanding;
  32
  33 static unsigned long idcounter;
  34
  35 void ensure_adns_init(void) {
  36   adns_initflags initflags;
  37   int r;
  38
  39   if (ads) return;
  40
  41   if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno);
  42
  43   initflags= adns_if_noautosys|adns_if_nosigpipe|ov_verbose;
  44   if (!ov_env) initflags |= adns_if_noenv;
  45
  46   if (config_text) {
  47     r= adns_init_strcfg(&ads, initflags, stderr, config_text);
  48   } else {
  49     r= adns_init(&ads, initflags, 0);
  50   }
  51   if (r) sysfail("adns_init",r);
  52
  53   if (ov_format == fmt_default)
  54     ov_format= ov_asynch ? fmt_asynch : fmt_simple;
  55 }
  56
  57 void type_info(adns_rrtype type, const char **typename_r,
  58                const void *datap, char **data_r) {
  59   static char buf[12];
  60   adns_status st;
  61
  62   st= adns_rr_info(type, typename_r, 0,0, datap,data_r);
  63   if (st == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
  64   assert(!st);
  65   if (typename_r && !*typename_r) {
  66     sprintf(buf,"TYPE%d", (int)(type & adns_rrt_typemask));
  67     *typename_r= buf;
  68   }
  69 }
  70
  71 static void prep_query(struct query_node **qun_r, int *quflags_r) {
  72   struct query_node *qun;
  73   char idbuf[20];
  74
  75   if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
  76   ensure_adns_init();
  77
  78   qun= malloc(sizeof(*qun));
  79   qun->pqfr= ov_pqfr;
  80   if (ov_id) {
  81     qun->id= xstrsave(ov_id);
  82   } else {
  83     sprintf(idbuf,"%lu",idcounter++);
  84     idcounter &= 0x0fffffffflu;
  85     qun->id= xstrsave(idbuf);
  86   }
  87
  88   *quflags_r=
  89     (ov_search ? adns_qf_search : 0) |
  90     (ov_tcp ? adns_qf_usevc : 0) |
  91     ((ov_pqfr.show_owner || ov_format == fmt_simple) ? adns_qf_owner : 0) |
  92     (ov_qc_query ? adns_qf_quoteok_query : 0) |
  93     (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
  94     (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
  95     (ov_v6map ? adns_qf_ipv6_mapv4 : 0) |
  96     ov_cname | ov_afflags;
  97
  98   *qun_r= qun;
  99 }
 100
 101 static void sockaddr_aton(const char *text, adns_rr_addr *a) {
 102   int err;
 103
 104   a->len= sizeof(a->addr);
 105   err= adns_text2addr(text,0,adns_qf_addrlit_scope_forbid,
 106                       &a->addr.sa,&a->len);
 107   if (err == EINVAL) usageerr("invalid IP address %s",text);
 108   else if (err) sysfail("adns_text2addr",err);
 109 }
 110
 111 void of_ptr(const struct optioninfo *oi, const char *arg, const char *arg2) {
 112   struct query_node *qun;
 113   int quflags, r;
 114   adns_rr_addr a;
 115
 116   sockaddr_aton(arg,&a);
 117   prep_query(&qun,&quflags);
 118   qun->owner= xstrsave(arg);
 119   r= adns_submit_reverse(ads, &a.addr.sa,
 120                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
 121                          quflags,
 122                          qun,
 123                          &qun->qu);
 124   if (r) sysfail("adns_submit_reverse",r);
 125
 126   LIST_LINK_TAIL(outstanding,qun);
 127 }
 128
 129 void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
 130   struct query_node *qun;
 131   int quflags, r;
 132   adns_rr_addr a;
 133
 134   sockaddr_aton(arg,&a);
 135   prep_query(&qun,&quflags);
 136   qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
 137   sprintf(qun->owner, "%s %s", arg,arg2);
 138   r= adns_submit_reverse_any(ads, &a.addr.sa,arg2,
 139                              ov_type == adns_r_none ? adns_r_txt : ov_type,
 140                              quflags,
 141                              qun,
 142                              &qun->qu);
 143   if (r) sysfail("adns_submit_reverse",r);
 144
 145   LIST_LINK_TAIL(outstanding,qun);
 146 }
 147
 148 void query_do(const char *domain) {
 149   struct query_node *qun;
 150   int quflags, r;
 151
 152   prep_query(&qun,&quflags);
 153   qun->owner= xstrsave(domain);
 154   r= adns_submit(ads, domain,
 155                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 156                  quflags,
 157                  qun,
 158                  &qun->qu);
 159   if (r) sysfail("adns_submit",r);
 160
 161   LIST_LINK_TAIL(outstanding,qun);
 162 }
 163
 164 static void dequeue_query(struct query_node *qun) {
 165   LIST_UNLINK(outstanding,qun);
 166   free(qun->id);
 167   free(qun->owner);
 168   free(qun);
 169 }
 170
 171 static void print_withspace(const char *str) {
 172   if (printf("%s ", str) == EOF) outerr();
 173 }
 174
 175 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 176   unsigned long ttl;
 177   time_t now;
 178
 179   switch (qun->pqfr.ttl) {
 180   case tm_none:
 181     return;
 182   case tm_rel:
 183     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 184     ttl= answer->expires < now ? 0 : answer->expires - now;
 185     break;
 186   case tm_abs:
 187     ttl= answer->expires;
 188     break;
 189   default:
 190     abort();
 191   }
 192   if (printf("%lu ",ttl) == EOF) outerr();
 193 }
 194
 195 static const char *owner_show(struct query_node *qun, adns_answer *answer) {
 196   return answer->owner ? answer->owner : qun->owner;
 197 }
 198
 199 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 200   if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
 201   print_ttl(qun,answer);
 202 }
 203
 204 static void check_status(adns_status st) {
 205   static const adns_status statuspoints[]= {
 206     adns_s_ok,
 207     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 208     adns_s_max_misconfig, adns_s_max_misquery
 209   };
 210
 211   const adns_status *spp;
 212   int minrcode;
 213
 214   for (minrcode=0, spp=statuspoints;
 215        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 216        spp++)
 217     if (st > *spp) minrcode++;
 218   if (rcode < minrcode) rcode= minrcode;
 219 }
 220
 221 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 222   const char *statustypeabbrev, *statusabbrev, *statusstring;
 223
 224   statustypeabbrev= adns_errtypeabbrev(st);
 225   statusabbrev= adns_errabbrev(st);
 226   statusstring= adns_strerror(st);
 227   assert(!strchr(statusstring,'"'));
 228
 229   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 230       == EOF) outerr();
 231   print_owner_ttl(qun,answer);
 232   if (qun->pqfr.show_cname)
 233     print_withspace(answer->cname ? answer->cname : "$");
 234   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 235 }
 236
 237 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 238   int r;
 239   const char *typename, *statusstring;
 240
 241   if (ov_format == fmt_inline) {
 242     if (fputs("; failed ",stdout) == EOF) outerr();
 243     print_status(st,qun,answer);
 244     return;
 245   }
 246   assert(ov_format == fmt_simple);
 247   if (st == adns_s_nxdomain) {
 248     r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
 249   } else {
 250     type_info(answer->type, &typename, 0,0);
 251     if (st == adns_s_nodata) {
 252       r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
 253     } else {
 254       statusstring= adns_strerror(st);
 255       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 256                  typename, owner_show(qun,answer), statusstring);
 257     }
 258   }
 259   if (r == EOF) sysfail("write error message to stderr",errno);
 260 }
 261
 262 void query_done(struct query_node *qun, adns_answer *answer) {
 263   adns_status st;
 264   int rrn, nrrs;
 265   const char *rrp, *realowner, *typename;
 266   char *datastr;
 267
 268   st= answer->status;
 269   nrrs= answer->nrrs;
 270   if (ov_format == fmt_asynch) {
 271     check_status(st);
 272     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 273     print_status(st,qun,answer);
 274   } else {
 275     if (qun->pqfr.show_cname && answer->cname) {
 276       print_owner_ttl(qun,answer);
 277       if (qun->pqfr.show_type) print_withspace("CNAME");
 278       if (printf("%s\n", answer->cname) == EOF) outerr();
 279     }
 280     if (st) {
 281       check_status(st);
 282       print_dnsfail(st,qun,answer);
 283     }
 284   }
 285   if (qun->pqfr.show_owner) {
 286     realowner= answer->cname ? answer->cname : owner_show(qun,answer);
 287     assert(realowner);
 288   } else {
 289     realowner= 0;
 290   }
 291   if (nrrs) {
 292     for (rrn=0, rrp = answer->rrs.untyped;
 293          rrn < nrrs;
 294          rrn++, rrp += answer->rrsz) {
 295       if (realowner) print_withspace(realowner);
 296       print_ttl(qun,answer);
 297       type_info(answer->type,&typename, rrp,&datastr);
 298       if (qun->pqfr.show_type) print_withspace(typename);
 299       if (printf("%s\n",datastr) == EOF) outerr();
 300       free(datastr);
 301     }
 302   }
 303   if (fflush(stdout)) outerr();
 304   free(answer);
 305   dequeue_query(qun);
 306 }
 307
 308 void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 309   free(ov_id);
 310   ov_id= xstrsave(arg);
 311 }
 312
 313 void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 314   struct query_node *qun;
 315
 316   for (qun= outstanding.head;
 317        qun && strcmp(qun->id,arg);
 318        qun= qun->next);
 319   if (!qun) return;
 320   adns_cancel(qun->qu);
 321   dequeue_query(qun);
 322 }