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