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) 1997-1999 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 void sysfail(const char *what, int errnoval) {
  32   fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
  33   exit(10);
  34 }
  35
  36 void usageerr(const char *fmt, ...) {
  37   va_list al;
  38   fputs("adnshost usage error: ",stderr);
  39   va_start(al,fmt);
  40   vfprintf(stderr,fmt,al);
  41   va_end(al);
  42   putc('\n',stderr);
  43   exit(11);
  44 }
  45
  46 void outerr(void) {
  47   sysfail("write to stdout",errno);
  48 }
  49
  50 void *xmalloc(size_t sz) {
  51   void *p;
  52
  53   p= malloc(sz); if (!p) sysfail("malloc",sz);
  54   return p;
  55 }
  56
  57 char *xstrsave(const char *str) {
  58   char *p;
  59
  60   p= xmalloc(strlen(str)+1);
  61   strcpy(p,str);
  62   return p;
  63 }
  64
  65 void of_type(const struct optioninfo *oi, const char *arg, const char *arg2) {
  66   static const struct typename {
  67     adns_rrtype type;
  68     const char *desc;
  69   } typenames[]= {
  70     /* enhanced versions */
  71     { adns_r_ns,     "ns"     },
  72     { adns_r_soa,    "soa"    },
  73     { adns_r_ptr,    "ptr"    },
  74     { adns_r_mx,     "mx"     },
  75     { adns_r_rp,     "rp"     },
  76     { adns_r_addr,   "addr"   },
  77
  78     /* types with only one version */
  79     { adns_r_cname,  "cname"  },
  80     { adns_r_hinfo,  "hinfo"  },
  81     { adns_r_txt,    "txt"    },
  82
  83     /* raw versions */
  84     { adns_r_a,        "a"    },
  85     { adns_r_ns_raw,   "ns-"  },
  86     { adns_r_soa_raw,  "soa-" },
  87     { adns_r_ptr_raw,  "ptr-" },
  88     { adns_r_mx_raw,   "mx-"  },
  89     { adns_r_rp_raw,   "rp-"  },
  90
  91     { adns_r_none, 0 }
  92   };
  93
  94   const struct typename *tnp;
  95
  96   for (tnp=typenames;
  97        tnp->type && strcmp(arg,tnp->desc);
  98        tnp++);
  99   if (!tnp->type) usageerr("unknown RR type %s",arg);
 100   ov_type= tnp->type;
 101 }
 102
 103 int rcode;
 104
 105 static void process_optarg(const char *arg,
 106                            const char *const **argv_p,
 107                            const char *value) {
 108   const struct optioninfo *oip;
 109   const char *arg2;
 110   int invert;
 111
 112   if (arg[0] == '-' || arg[0] == '+') {
 113     if (arg[0] == '-' && arg[1] == '-') {
 114       if (!strncmp(arg,"--no-",5)) {
 115         invert= 1;
 116         oip= opt_findl(arg+5);
 117       } else {
 118         invert= 0;
 119         oip= opt_findl(arg+2);
 120       }
 121       if (oip->type == ot_funcarg) {
 122         arg= argv_p ? *++(*argv_p) : value;
 123         if (!arg) usageerr("option --%s requires a value argument",oip->lopt);
 124         arg2= 0;
 125       } else if (oip->type == ot_funcarg2) {
 126         assert(argv_p);
 127         arg= *++(*argv_p);
 128         if (arg) arg2= *++(*argv_p);
 129         if (!arg || !arg2)
 130           usageerr("option --%s requires two more arguments", oip->lopt);
 131       } else {
 132         if (value) usageerr("option --%s does not take a value",oip->lopt);
 133         arg= 0;
 134         arg2= 0;
 135       }
 136       opt_do(oip,invert,arg,arg2);
 137     } else if (arg[0] == '-' && arg[1] == 0) {
 138       arg= argv_p ? *++(*argv_p) : value;
 139       if (!arg) usageerr("option `-' must be followed by a domain");
 140       query_do(arg);
 141     } else { /* arg[1] != '-', != '\0' */
 142       invert= (arg[0] == '+');
 143       ++arg;
 144       while (*arg) {
 145         oip= opt_finds(&arg);
 146         if (oip->type == ot_funcarg) {
 147           if (!*arg) {
 148             arg= argv_p ? *++(*argv_p) : value;
 149             if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
 150           } else {
 151             if (value) usageerr("two values for option -%s given !",oip->sopt);
 152           }
 153           opt_do(oip,invert,arg,0);
 154           arg= "";
 155         } else {
 156           if (value) usageerr("option -%s does not take a value",oip->sopt);
 157           opt_do(oip,invert,0,0);
 158         }
 159       }
 160     }
 161   } else { /* arg[0] != '-' */
 162     query_do(arg);
 163   }
 164 }
 165
 166 static void read_stdin(void) {
 167   static int used, avail;
 168   static char *buf;
 169
 170   int anydone, r;
 171   char *newline, *space;
 172
 173   anydone= 0;
 174   while (!anydone || used) {
 175     while (!(newline= memchr(buf,'\n',used))) {
 176       if (used == avail) {
 177         avail += 20; avail <<= 1;
 178         buf= realloc(buf,avail);
 179         if (!buf) sysfail("realloc stdin buffer",errno);
 180       }
 181       do {
 182         r= read(0,buf+used,avail-used);
 183       } while (r < 0 && errno == EINTR);
 184       if (r == 0) {
 185         if (used) {
 186           /* fake up final newline */
 187           buf[used++]= '\n';
 188           r= 1;
 189         } else {
 190           ov_pipe= 0;
 191           return;
 192         }
 193       }
 194       if (r < 0) sysfail("read stdin",errno);
 195       used += r;
 196     }
 197     *newline++= 0;
 198     space= strchr(buf,' ');
 199     if (space) *space++= 0;
 200     process_optarg(buf,0,space);
 201     used -= (newline-buf);
 202     memmove(buf,newline,used);
 203     anydone= 1;
 204   }
 205 }
 206
 207 int main(int argc, const char *const *argv) {
 208   struct timeval *tv, tvbuf;
 209   adns_query qu;
 210   void *qun_v;
 211   adns_answer *answer;
 212   int r, maxfd;
 213   fd_set readfds, writefds, exceptfds;
 214   const char *arg;
 215
 216   while ((arg= *++argv)) process_optarg(arg,&argv,0);
 217
 218   if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
 219
 220   ensure_adns_init();
 221
 222   for (;;) {
 223     for (;;) {
 224       qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0;
 225       r= adns_check(ads,&qu,&answer,&qun_v);
 226       if (r == EAGAIN) break;
 227       if (r == ESRCH) { if (!ov_pipe) goto x_quit; else break; }
 228       assert(!r);
 229       query_done(qun_v,answer);
 230     }
 231     maxfd= 0;
 232     FD_ZERO(&readfds);
 233     FD_ZERO(&writefds);
 234     FD_ZERO(&exceptfds);
 235     if (ov_pipe) {
 236       maxfd= 1;
 237       FD_SET(0,&readfds);
 238     }
 239     tv= 0;
 240     adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
 241     r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
 242     if (r == -1) {
 243       if (errno == EINTR) continue;
 244       sysfail("select",errno);
 245     }
 246     adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
 247     if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin();
 248   }
 249 x_quit:
 250   if (fclose(stdout)) outerr();
 251   exit(rcode);
 252 }