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_arg(const char *domain) {
  51   if (ov_pipe) 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) { abort(); }
  72
  73 int rcode;
  74
  75 void setnonblock(int fd, int nonblock) { }
  76
  77 static void read_query(void) { abort(); }
  78
  79 int main(int argc, const char *const *argv) {
  80   const char *arg;
  81   const struct optioninfo *oip;
  82   struct timeval *tv, tvbuf;
  83   adns_query qu;
  84   void *qun_v;
  85   adns_answer *answer;
  86   int r, maxfd;
  87   fd_set readfds, writefds, exceptfds;
  88
  89   while ((arg= *++argv)) {
  90     if (arg[0] == '-') {
  91       if (arg[1] == '-') {
  92         oip= opt_findl(arg+2);
  93         if (oip->type == ot_funcarg) {
  94           arg= *++argv;
  95           if (!arg) usageerr("option --%s requires a value argument",oip->lopt);
  96         } else {
  97           arg= 0;
  98         }
  99         opt_do(oip,arg);
 100       } else if (arg[1] == 0) {
 101         arg= *++argv;
 102         if (!arg) usageerr("option `-' must be followed by a domain");
 103         domain_do_arg(arg);
 104       } else { /* arg[1] != '-', != '\0' */
 105         ++arg;
 106         while (*arg) {
 107           oip= opt_finds(&arg);
 108           if (oip->type == ot_funcarg) {
 109             if (!*arg) {
 110               arg= *++argv;
 111               if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
 112             }
 113             arg= "";
 114           } else {
 115             arg= 0;
 116           }
 117           opt_do(oip,arg);
 118         }
 119       }
 120     } else { /* arg[0] != '-' */
 121       domain_do_arg(arg);
 122     }
 123   }
 124
 125   if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
 126
 127   for (;;) {
 128     for (;;) {
 129       qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0;
 130       r= adns_check(ads,&qu,&answer,&qun_v);
 131       if (r == EAGAIN) break;
 132       if (r == ESRCH) { if (!ov_pipe) goto x_quit; else break; }
 133       assert(!r);
 134       query_done(qun_v,answer);
 135     }
 136     maxfd= 0;
 137     FD_ZERO(&readfds);
 138     FD_ZERO(&writefds);
 139     FD_ZERO(&exceptfds);
 140     if (ov_pipe) {
 141       maxfd= 1;
 142       FD_SET(0,&readfds);
 143     }
 144     tv= 0;
 145     adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
 146     r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
 147     if (r == -1) {
 148       if (errno == EINTR) continue;
 149       sysfail("select",errno);
 150     }
 151     adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
 152     if (ov_pipe && FD_ISSET(0,&readfds)) read_query();
 153   }
 154 x_quit:
 155   if (fclose(stdout)) outerr();
 156   exit(rcode);
 157 }