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  Ian Jackson
   9  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  10  *    Copyright (C) 1991 Massachusetts Institute of Technology
  11  *  (See the file INSTALL for full details.)
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 3, or (at your option)
  16  *  any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software Foundation.
  25  */
  26
  27 #include "adnshost.h"
  28
  29 adns_state ads;
  30 struct outstanding_list outstanding;
  31
  32 static unsigned long idcounter;
  33
  34 void ensure_adns_init(void) {
  35   adns_initflags initflags;
  36   int r;
  37
  38   if (ads) return;
  39
  40   if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno);
  41
  42   initflags= adns_if_noautosys|adns_if_nosigpipe|ov_verbose;
  43   if (!ov_env) initflags |= adns_if_noenv;
  44
  45   if (config_text) {
  46     r= adns_init_strcfg(&ads, initflags, stderr, config_text);
  47   } else {
  48     r= adns_init(&ads, initflags, 0);
  49   }
  50   if (r) sysfail("adns_init",r);
  51
  52   if (ov_format == fmt_default)
  53     ov_format= ov_asynch ? fmt_asynch : fmt_simple;
  54 }
  55
  56 void type_info(adns_rrtype type, const char **typename_r,
  57                const void *datap, char **data_r) {
  58   static char buf[12];
  59   adns_status st;
  60
  61   st= adns_rr_info(type, typename_r, 0,0, datap,data_r);
  62   if (st == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
  63   assert(!st);
  64   if (typename_r && !*typename_r) {
  65     sprintf(buf,"TYPE%d", (int)(type & adns_rrt_typemask));
  66     *typename_r= buf;
  67   }
  68 }
  69
  70 static void prep_query(struct query_node **qun_r, int *quflags_r) {
  71   struct query_node *qun;
  72   char idbuf[20];
  73
  74   if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
  75   ensure_adns_init();
  76
  77   qun= malloc(sizeof(*qun));
  78   qun->pqfr= ov_pqfr;
  79   if (ov_id) {
  80     qun->id= xstrsave(ov_id);
  81   } else {
  82     sprintf(idbuf,"%lu",idcounter++);
  83     idcounter &= 0x0fffffffflu;
  84     qun->id= xstrsave(idbuf);
  85   }
  86
  87   *quflags_r=
  88     (ov_search ? adns_qf_search : 0) |
  89     (ov_tcp ? adns_qf_usevc : 0) |
  90     ((ov_pqfr.show_owner || ov_format == fmt_simple) ? adns_qf_owner : 0) |
  91     (ov_qc_query ? adns_qf_quoteok_query : 0) |
  92     (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
  93     (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
  94     (ov_v6map ? adns_qf_ipv6_mapv4 : 0) |
  95     ov_cname | ov_afflags;
  96
  97   *qun_r= qun;
  98 }
  99
 100 static void sockaddr_aton(const char *text, adns_rr_addr *a) {
 101   int err;
 102
 103   a->len= sizeof(a->addr);
 104   err= adns_text2addr(text,0,adns_qf_addrlit_scope_forbid,
 105                       &a->addr.sa,&a->len);
 106   if (err == EINVAL) usageerr("invalid IP address %s",text);
 107   else if (err) sysfail("adns_text2addr",err);
 108 }
 109
 110 void of_ptr(const struct optioninfo *oi, const char *arg, const char *arg2) {
 111   struct query_node *qun;
 112   int quflags, r;
 113   adns_rr_addr a;
 114
 115   sockaddr_aton(arg,&a);
 116   prep_query(&qun,&quflags);
 117   qun->owner= xstrsave(arg);
 118   r= adns_submit_reverse(ads, &a.addr.sa,
 119                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
 120                          quflags,
 121                          qun,
 122                          &qun->qu);
 123   if (r) sysfail("adns_submit_reverse",r);
 124
 125   LIST_LINK_TAIL(outstanding,qun);
 126 }
 127
 128 void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
 129   struct query_node *qun;
 130   int quflags, r;
 131   adns_rr_addr a;
 132
 133   sockaddr_aton(arg,&a);
 134   prep_query(&qun,&quflags);
 135   qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
 136   sprintf(qun->owner, "%s %s", arg,arg2);
 137   r= adns_submit_reverse_any(ads, &a.addr.sa,arg2,
 138                              ov_type == adns_r_none ? adns_r_txt : ov_type,
 139                              quflags,
 140                              qun,
 141                              &qun->qu);
 142   if (r) sysfail("adns_submit_reverse",r);
 143
 144   LIST_LINK_TAIL(outstanding,qun);
 145 }
 146
 147 void query_do(const char *domain) {
 148   struct query_node *qun;
 149   int quflags, r;
 150
 151   prep_query(&qun,&quflags);
 152   qun->owner= xstrsave(domain);
 153   r= adns_submit(ads, domain,
 154                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 155                  quflags,
 156                  qun,
 157                  &qun->qu);
 158   if (r) sysfail("adns_submit",r);
 159
 160   LIST_LINK_TAIL(outstanding,qun);
 161 }
 162
 163 static void dequeue_query(struct query_node *qun) {
 164   LIST_UNLINK(outstanding,qun);
 165   free(qun->id);
 166   free(qun->owner);
 167   free(qun);
 168 }
 169
 170 static void print_withspace(const char *str) {
 171   if (printf("%s ", str) == EOF) outerr();
 172 }
 173
 174 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 175   unsigned long ttl;
 176   time_t now;
 177
 178   switch (qun->pqfr.ttl) {
 179   case tm_none:
 180     return;
 181   case tm_rel:
 182     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 183     ttl= answer->expires < now ? 0 : answer->expires - now;
 184     break;
 185   case tm_abs:
 186     ttl= answer->expires;
 187     break;
 188   default:
 189     abort();
 190   }
 191   if (printf("%lu ",ttl) == EOF) outerr();
 192 }
 193
 194 static const char *owner_show(struct query_node *qun, adns_answer *answer) {
 195   return answer->owner ? answer->owner : qun->owner;
 196 }
 197
 198 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 199   if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
 200   print_ttl(qun,answer);
 201 }
 202
 203 static void check_status(adns_status st) {
 204   static const adns_status statuspoints[]= {
 205     adns_s_ok,
 206     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 207     adns_s_max_misconfig, adns_s_max_misquery
 208   };
 209
 210   const adns_status *spp;
 211   int minrcode;
 212
 213   for (minrcode=0, spp=statuspoints;
 214        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 215        spp++)
 216     if (st > *spp) minrcode++;
 217   if (rcode < minrcode) rcode= minrcode;
 218 }
 219
 220 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 221   const char *statustypeabbrev, *statusabbrev, *statusstring;
 222
 223   statustypeabbrev= adns_errtypeabbrev(st);
 224   statusabbrev= adns_errabbrev(st);
 225   statusstring= adns_strerror(st);
 226   assert(!strchr(statusstring,'"'));
 227
 228   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 229       == EOF) outerr();
 230   print_owner_ttl(qun,answer);
 231   if (qun->pqfr.show_cname)
 232     print_withspace(answer->cname ? answer->cname : "$");
 233   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 234 }
 235
 236 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 237   int r;
 238   const char *typename, *statusstring;
 239
 240   if (ov_format == fmt_inline) {
 241     if (fputs("; failed ",stdout) == EOF) outerr();
 242     print_status(st,qun,answer);
 243     return;
 244   }
 245   assert(ov_format == fmt_simple);
 246   if (st == adns_s_nxdomain) {
 247     r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
 248   } else {
 249     type_info(answer->type, &typename, 0,0);
 250     if (st == adns_s_nodata) {
 251       r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
 252     } else {
 253       statusstring= adns_strerror(st);
 254       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 255                  typename, owner_show(qun,answer), statusstring);
 256     }
 257   }
 258   if (r == EOF) sysfail("write error message to stderr",errno);
 259 }
 260
 261 void query_done(struct query_node *qun, adns_answer *answer) {
 262   adns_status st;
 263   int rrn, nrrs;
 264   const char *rrp, *realowner, *typename;
 265   char *datastr;
 266
 267   st= answer->status;
 268   nrrs= answer->nrrs;
 269   if (ov_format == fmt_asynch) {
 270     check_status(st);
 271     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 272     print_status(st,qun,answer);
 273   } else {
 274     if (qun->pqfr.show_cname && answer->cname) {
 275       print_owner_ttl(qun,answer);
 276       if (qun->pqfr.show_type) print_withspace("CNAME");
 277       if (printf("%s\n", answer->cname) == EOF) outerr();
 278     }
 279     if (st) {
 280       check_status(st);
 281       print_dnsfail(st,qun,answer);
 282     }
 283   }
 284   if (qun->pqfr.show_owner) {
 285     realowner= answer->cname ? answer->cname : owner_show(qun,answer);
 286     assert(realowner);
 287   } else {
 288     realowner= 0;
 289   }
 290   if (nrrs) {
 291     for (rrn=0, rrp = answer->rrs.untyped;
 292          rrn < nrrs;
 293          rrn++, rrp += answer->rrsz) {
 294       if (realowner) print_withspace(realowner);
 295       print_ttl(qun,answer);
 296       type_info(answer->type,&typename, rrp,&datastr);
 297       if (qun->pqfr.show_type) print_withspace(typename);
 298       if (printf("%s\n",datastr) == EOF) outerr();
 299       free(datastr);
 300     }
 301   }
 302   if (fflush(stdout)) outerr();
 303   free(answer);
 304   dequeue_query(qun);
 305 }
 306
 307 void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 308   free(ov_id);
 309   ov_id= xstrsave(arg);
 310 }
 311
 312 void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 313   struct query_node *qun;
 314
 315   for (qun= outstanding.head;
 316        qun && strcmp(qun->id,arg);
 317        qun= qun->next);
 318   if (!qun) return;
 319   adns_cancel(qun->qu);
 320   dequeue_query(qun);
 321 }