mdw@git.distorted.org.uk Git - adns/blob - client/adh-main.c

   1 /*
   2  * adh-main.c
   3  * - useful general-purpose resolver client program
   4  *   main program and useful subroutines
   5  */
   6 /*
   7  *  This file is
   8  *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  It is part of adns, which is
  11  *    Copyright (C) 1997-2000 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 int rcode;
  32 const char *config_text;
  33
  34 static int used, avail;
  35 static char *buf;
  36
  37 void quitnow(int rc) {
  38   if (ads) adns_finish(ads);
  39   free(buf);
  40   free(ov_id);
  41   exit(rc);
  42 }
  43
  44 void sysfail(const char *what, int errnoval) {
  45   fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
  46   quitnow(10);
  47 }
  48
  49 void usageerr(const char *fmt, ...) {
  50   va_list al;
  51   fputs("adnshost usage error: ",stderr);
  52   va_start(al,fmt);
  53   vfprintf(stderr,fmt,al);
  54   va_end(al);
  55   putc('\n',stderr);
  56   quitnow(11);
  57 }
  58
  59 void outerr(void) {
  60   sysfail("write to stdout",errno);
  61 }
  62
  63 void *xmalloc(size_t sz) {
  64   void *p;
  65
  66   p= malloc(sz); if (!p) sysfail("malloc",sz);
  67   return p;
  68 }
  69
  70 char *xstrsave(const char *str) {
  71   char *p;
  72
  73   p= xmalloc(strlen(str)+1);
  74   strcpy(p,str);
  75   return p;
  76 }
  77
  78 void of_config(const struct optioninfo *oi, const char *arg, const char *arg2) {
  79   config_text= arg;
  80 }
  81
  82 void of_type(const struct optioninfo *oi, const char *arg, const char *arg2) {
  83   static const struct typename {
  84     adns_rrtype type;
  85     const char *desc;
  86   } typenames[]= {
  87     /* enhanced versions */
  88     { adns_r_ns,     "ns"     },
  89     { adns_r_soa,    "soa"    },
  90     { adns_r_ptr,    "ptr"    },
  91     { adns_r_mx,     "mx"     },
  92     { adns_r_rp,     "rp"     },
  93     { adns_r_addr,   "addr"   },
  94
  95     /* types with only one version */
  96     { adns_r_cname,  "cname"  },
  97     { adns_r_hinfo,  "hinfo"  },
  98     { adns_r_txt,    "txt"    },
  99
 100     /* raw versions */
 101     { adns_r_a,        "a"    },
 102     { adns_r_ns_raw,   "ns-"  },
 103     { adns_r_soa_raw,  "soa-" },
 104     { adns_r_ptr_raw,  "ptr-" },
 105     { adns_r_mx_raw,   "mx-"  },
 106     { adns_r_rp_raw,   "rp-"  },
 107
 108     { adns_r_none, 0 }
 109   };
 110
 111   const struct typename *tnp;
 112
 113   for (tnp=typenames;
 114        tnp->type && strcmp(arg,tnp->desc);
 115        tnp++);
 116   if (!tnp->type) usageerr("unknown RR type %s",arg);
 117   ov_type= tnp->type;
 118 }
 119
 120 static void process_optarg(const char *arg,
 121                            const char *const **argv_p,
 122                            const char *value) {
 123   const struct optioninfo *oip;
 124   const char *arg2;
 125   int invert;
 126
 127   if (arg[0] == '-' || arg[0] == '+') {
 128     if (arg[0] == '-' && arg[1] == '-') {
 129       if (!strncmp(arg,"--no-",5)) {
 130         invert= 1;
 131         oip= opt_findl(arg+5);
 132       } else {
 133         invert= 0;
 134         oip= opt_findl(arg+2);
 135       }
 136       if (oip->type == ot_funcarg) {
 137         arg= argv_p ? *++(*argv_p) : value;
 138         if (!arg) usageerr("option --%s requires a value argument",oip->lopt);
 139         arg2= 0;
 140       } else if (oip->type == ot_funcarg2) {
 141         assert(argv_p);
 142         arg= *++(*argv_p);
 143         arg2= arg ? *++(*argv_p) : 0;
 144         if (!arg || !arg2)
 145           usageerr("option --%s requires two more arguments", oip->lopt);
 146       } else {
 147         if (value) usageerr("option --%s does not take a value",oip->lopt);
 148         arg= 0;
 149         arg2= 0;
 150       }
 151       opt_do(oip,invert,arg,arg2);
 152     } else if (arg[0] == '-' && arg[1] == 0) {
 153       arg= argv_p ? *++(*argv_p) : value;
 154       if (!arg) usageerr("option `-' must be followed by a domain");
 155       query_do(arg);
 156     } else { /* arg[1] != '-', != '\0' */
 157       invert= (arg[0] == '+');
 158       ++arg;
 159       while (*arg) {
 160         oip= opt_finds(&arg);
 161         if (oip->type == ot_funcarg) {
 162           if (!*arg) {
 163             arg= argv_p ? *++(*argv_p) : value;
 164             if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
 165           } else {
 166             if (value) usageerr("two values for option -%s given !",oip->sopt);
 167           }
 168           opt_do(oip,invert,arg,0);
 169           arg= "";
 170         } else {
 171           if (value) usageerr("option -%s does not take a value",oip->sopt);
 172           opt_do(oip,invert,0,0);
 173         }
 174       }
 175     }
 176   } else { /* arg[0] != '-' */
 177     query_do(arg);
 178   }
 179 }
 180
 181 static void read_stdin(void) {
 182   int anydone, r;
 183   char *newline, *space;
 184
 185   anydone= 0;
 186   while (!anydone || used) {
 187     while (!(newline= memchr(buf,'\n',used))) {
 188       if (used == avail) {
 189         avail += 20; avail <<= 1;
 190         buf= realloc(buf,avail);
 191         if (!buf) sysfail("realloc stdin buffer",errno);
 192       }
 193       do {
 194         r= read(0,buf+used,avail-used);
 195       } while (r < 0 && errno == EINTR);
 196       if (r == 0) {
 197         if (used) {
 198           /* fake up final newline */
 199           buf[used++]= '\n';
 200           r= 1;
 201         } else {
 202           ov_pipe= 0;
 203           return;
 204         }
 205       }
 206       if (r < 0) sysfail("read stdin",errno);
 207       used += r;
 208     }
 209     *newline++= 0;
 210     space= strchr(buf,' ');
 211     if (space) *space++= 0;
 212     process_optarg(buf,0,space);
 213     used -= (newline-buf);
 214     memmove(buf,newline,used);
 215     anydone= 1;
 216   }
 217 }
 218
 219 int main(int argc, const char *const *argv) {
 220   struct timeval *tv, tvbuf;
 221   adns_query qu;
 222   void *qun_v;
 223   adns_answer *answer;
 224   int r, maxfd;
 225   fd_set readfds, writefds, exceptfds;
 226   const char *arg;
 227
 228   while ((arg= *++argv)) process_optarg(arg,&argv,0);
 229
 230   if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
 231
 232   ensure_adns_init();
 233
 234   for (;;) {
 235     for (;;) {
 236       qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0;
 237       r= adns_check(ads,&qu,&answer,&qun_v);
 238       if (r == EAGAIN) break;
 239       if (r == ESRCH) { if (!ov_pipe) goto x_quit; else break; }
 240       assert(!r);
 241       query_done(qun_v,answer);
 242     }
 243     maxfd= 0;
 244     FD_ZERO(&readfds);
 245     FD_ZERO(&writefds);
 246     FD_ZERO(&exceptfds);
 247     if (ov_pipe) {
 248       maxfd= 1;
 249       FD_SET(0,&readfds);
 250     }
 251     tv= 0;
 252     adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
 253     r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
 254     if (r == -1) {
 255       if (errno == EINTR) continue;
 256       sysfail("select",errno);
 257     }
 258     adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
 259     if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin();
 260   }
 261 x_quit:
 262   if (fclose(stdout)) outerr();
 263   quitnow(rcode);
 264 }