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  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 2, 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  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  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_cname;
  96
  97   *qun_r= qun;
  98 }
  99
 100 void of_ptr(const struct optioninfo *oi, const char *arg, const char *arg2) {
 101   struct query_node *qun;
 102   int quflags, r;
 103   struct sockaddr_in sa;
 104
 105   memset(&sa,0,sizeof(sa));
 106   sa.sin_family= AF_INET;
 107   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
 108
 109   prep_query(&qun,&quflags);
 110   qun->owner= xstrsave(arg);
 111   r= adns_submit_reverse(ads,
 112                          (struct sockaddr*)&sa,
 113                          ov_type == adns_r_none ? adns_r_ptr : ov_type,
 114                          quflags,
 115                          qun,
 116                          &qun->qu);
 117   if (r) sysfail("adns_submit_reverse",r);
 118
 119   LIST_LINK_TAIL(outstanding,qun);
 120 }
 121
 122 void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
 123   struct query_node *qun;
 124   int quflags, r;
 125   struct sockaddr_in sa;
 126
 127   memset(&sa,0,sizeof(sa));
 128   sa.sin_family= AF_INET;
 129   if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
 130
 131   prep_query(&qun,&quflags);
 132   qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
 133   sprintf(qun->owner, "%s %s", arg,arg2);
 134   r= adns_submit_reverse_any(ads,
 135                              (struct sockaddr*)&sa, arg2,
 136                              ov_type == adns_r_none ? adns_r_txt : ov_type,
 137                              quflags,
 138                              qun,
 139                              &qun->qu);
 140   if (r) sysfail("adns_submit_reverse",r);
 141
 142   LIST_LINK_TAIL(outstanding,qun);
 143 }
 144
 145 void query_do(const char *domain) {
 146   struct query_node *qun;
 147   int quflags, r;
 148
 149   prep_query(&qun,&quflags);
 150   qun->owner= xstrsave(domain);
 151   r= adns_submit(ads, domain,
 152                  ov_type == adns_r_none ? adns_r_addr : ov_type,
 153                  quflags,
 154                  qun,
 155                  &qun->qu);
 156   if (r) sysfail("adns_submit",r);
 157
 158   LIST_LINK_TAIL(outstanding,qun);
 159 }
 160
 161 static void dequeue_query(struct query_node *qun) {
 162   LIST_UNLINK(outstanding,qun);
 163   free(qun->id);
 164   free(qun->owner);
 165   free(qun);
 166 }
 167
 168 static void print_withspace(const char *str) {
 169   if (printf("%s ", str) == EOF) outerr();
 170 }
 171
 172 static void print_ttl(struct query_node *qun, adns_answer *answer) {
 173   unsigned long ttl;
 174   time_t now;
 175
 176   switch (qun->pqfr.ttl) {
 177   case tm_none:
 178     return;
 179   case tm_rel:
 180     if (time(&now) == (time_t)-1) sysfail("get current time",errno);
 181     ttl= answer->expires < now ? 0 : answer->expires - now;
 182     break;
 183   case tm_abs:
 184     ttl= answer->expires;
 185     break;
 186   default:
 187     abort();
 188   }
 189   if (printf("%lu ",ttl) == EOF) outerr();
 190 }
 191
 192 static const char *owner_show(struct query_node *qun, adns_answer *answer) {
 193   return answer->owner ? answer->owner : qun->owner;
 194 }
 195
 196 static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
 197   if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
 198   print_ttl(qun,answer);
 199 }
 200
 201 static void check_status(adns_status st) {
 202   static const adns_status statuspoints[]= {
 203     adns_s_ok,
 204     adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
 205     adns_s_max_misconfig, adns_s_max_misquery
 206   };
 207
 208   const adns_status *spp;
 209   int minrcode;
 210
 211   for (minrcode=0, spp=statuspoints;
 212        spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
 213        spp++)
 214     if (st > *spp) minrcode++;
 215   if (rcode < minrcode) rcode= minrcode;
 216 }
 217
 218 static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
 219   const char *statustypeabbrev, *statusabbrev, *statusstring;
 220
 221   statustypeabbrev= adns_errtypeabbrev(st);
 222   statusabbrev= adns_errabbrev(st);
 223   statusstring= adns_strerror(st);
 224   assert(!strchr(statusstring,'"'));
 225
 226   if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
 227       == EOF) outerr();
 228   print_owner_ttl(qun,answer);
 229   if (qun->pqfr.show_cname)
 230     print_withspace(answer->cname ? answer->cname : "$");
 231   if (printf("\"%s\"\n", statusstring) == EOF) outerr();
 232 }
 233
 234 static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
 235   int r;
 236   const char *typename, *statusstring;
 237
 238   if (ov_format == fmt_inline) {
 239     if (fputs("; failed ",stdout) == EOF) outerr();
 240     print_status(st,qun,answer);
 241     return;
 242   }
 243   assert(ov_format == fmt_simple);
 244   if (st == adns_s_nxdomain) {
 245     r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
 246   } else {
 247     type_info(answer->type, &typename, 0,0);
 248     if (st == adns_s_nodata) {
 249       r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
 250     } else {
 251       statusstring= adns_strerror(st);
 252       r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
 253                  typename, owner_show(qun,answer), statusstring);
 254     }
 255   }
 256   if (r == EOF) sysfail("write error message to stderr",errno);
 257 }
 258
 259 void query_done(struct query_node *qun, adns_answer *answer) {
 260   adns_status st;
 261   int rrn, nrrs;
 262   const char *rrp, *realowner, *typename;
 263   char *datastr;
 264
 265   st= answer->status;
 266   nrrs= answer->nrrs;
 267   if (ov_format == fmt_asynch) {
 268     check_status(st);
 269     if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
 270     print_status(st,qun,answer);
 271   } else {
 272     if (qun->pqfr.show_cname && answer->cname) {
 273       print_owner_ttl(qun,answer);
 274       if (qun->pqfr.show_type) print_withspace("CNAME");
 275       if (printf("%s\n", answer->cname) == EOF) outerr();
 276     }
 277     if (st) {
 278       check_status(st);
 279       print_dnsfail(st,qun,answer);
 280     }
 281   }
 282   if (qun->pqfr.show_owner) {
 283     realowner= answer->cname ? answer->cname : owner_show(qun,answer);
 284     assert(realowner);
 285   } else {
 286     realowner= 0;
 287   }
 288   if (nrrs) {
 289     for (rrn=0, rrp = answer->rrs.untyped;
 290          rrn < nrrs;
 291          rrn++, rrp += answer->rrsz) {
 292       if (realowner) print_withspace(realowner);
 293       print_ttl(qun,answer);
 294       type_info(answer->type,&typename, rrp,&datastr);
 295       if (qun->pqfr.show_type) print_withspace(typename);
 296       if (printf("%s\n",datastr) == EOF) outerr();
 297       free(datastr);
 298     }
 299   }
 300   if (fflush(stdout)) outerr();
 301   free(answer);
 302   dequeue_query(qun);
 303 }
 304
 305 void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 306   free(ov_id);
 307   ov_id= xstrsave(arg);
 308 }
 309
 310 void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
 311   struct query_node *qun;
 312
 313   for (qun= outstanding.head;
 314        qun && strcmp(qun->id,arg);
 315        qun= qun->next);
 316   if (!qun) return;
 317   adns_cancel(qun->qu);
 318   dequeue_query(qun);
 319 }