3 * - useful general-purpose resolver client program
4 * main program and useful subroutines
8 * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
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>
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)
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.
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.
31 void sysfail(const char *what, int errnoval) {
32 fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
36 void usageerr(const char *fmt, ...) {
38 fputs("adnshost usage error: ",stderr);
40 vfprintf(stderr,fmt,al);
47 sysfail("write to stdout",errno);
50 static void domain_do_arg(const char *domain) {
51 if (ov_pipe) usageerr("-f/--pipe not consistent with domains on command line");
56 void *xmalloc(size_t sz) {
59 p= malloc(sz); if (!p) sysfail("malloc",sz);
63 char *xstrsave(const char *str) {
66 p= xmalloc(strlen(str)+1);
71 void of_type(const struct optioninfo *oi, const char *arg) { abort(); }
75 void setnonblock(int fd, int nonblock) { }
77 static void read_query(void) { abort(); }
79 int main(int argc, const char *const *argv) {
81 const struct optioninfo *oip;
82 struct timeval *tv, tvbuf;
87 fd_set readfds, writefds, exceptfds;
89 while ((arg= *++argv)) {
92 oip= opt_findl(arg+2);
93 if (oip->type == ot_funcarg) {
95 if (!arg) usageerr("option --%s requires a value argument",oip->lopt);
100 } else if (arg[1] == 0) {
102 if (!arg) usageerr("option `-' must be followed by a domain");
104 } else { /* arg[1] != '-', != '\0' */
107 oip= opt_finds(&arg);
108 if (oip->type == ot_funcarg) {
111 if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
120 } else { /* arg[0] != '-' */
125 if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
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; }
134 query_done(qun_v,answer);
145 adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
146 r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
148 if (errno == EINTR) continue;
149 sysfail("select",errno);
151 adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
152 if (ov_pipe && FD_ISSET(0,&readfds)) read_query();
155 if (fclose(stdout)) outerr();