3 * - useful general-purpose resolver client program
4 * main program and useful subroutines
8 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
10 * It is part of adns, which is
11 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
12 * Copyright (C) 1999-2000 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.
32 const char *config_text;
34 static int used, avail;
37 void quitnow(int rc) {
38 if (ads) adns_finish(ads);
44 void sysfail(const char *what, int errnoval) {
45 fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
49 void usageerr(const char *fmt, ...) {
51 fputs("adnshost usage error: ",stderr);
53 vfprintf(stderr,fmt,al);
60 sysfail("write to stdout",errno);
63 void *xmalloc(size_t sz) {
66 p= malloc(sz); if (!p) sysfail("malloc",sz);
70 char *xstrsave(const char *str) {
73 p= xmalloc(strlen(str)+1);
78 void of_config(const struct optioninfo *oi, const char *arg, const char *arg2) {
82 void of_type(const struct optioninfo *oi, const char *arg, const char *arg2) {
83 static const struct typename {
87 /* enhanced versions */
89 { adns_r_soa, "soa" },
90 { adns_r_ptr, "ptr" },
93 { adns_r_addr, "addr" },
95 /* types with only one version */
96 { adns_r_cname, "cname" },
97 { adns_r_hinfo, "hinfo" },
98 { adns_r_txt, "txt" },
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-" },
111 const struct typename *tnp;
114 tnp->type && strcmp(arg,tnp->desc);
116 if (!tnp->type) usageerr("unknown RR type %s",arg);
120 static void process_optarg(const char *arg,
121 const char *const **argv_p,
123 const struct optioninfo *oip;
127 if (arg[0] == '-' || arg[0] == '+') {
128 if (arg[0] == '-' && arg[1] == '-') {
129 if (!strncmp(arg,"--no-",5)) {
131 oip= opt_findl(arg+5);
134 oip= opt_findl(arg+2);
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);
140 } else if (oip->type == ot_funcarg2) {
143 arg2= arg ? *++(*argv_p) : 0;
145 usageerr("option --%s requires two more arguments", oip->lopt);
147 if (value) usageerr("option --%s does not take a value",oip->lopt);
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");
156 } else { /* arg[1] != '-', != '\0' */
157 invert= (arg[0] == '+');
160 oip= opt_finds(&arg);
161 if (oip->type == ot_funcarg) {
163 arg= argv_p ? *++(*argv_p) : value;
164 if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
166 if (value) usageerr("two values for option -%s given !",oip->sopt);
168 opt_do(oip,invert,arg,0);
171 if (value) usageerr("option -%s does not take a value",oip->sopt);
172 opt_do(oip,invert,0,0);
176 } else { /* arg[0] != '-' */
181 static void read_stdin(void) {
183 char *newline, *space;
186 while (!anydone || used) {
187 while (!(newline= memchr(buf,'\n',used))) {
189 avail += 20; avail <<= 1;
190 buf= realloc(buf,avail);
191 if (!buf) sysfail("realloc stdin buffer",errno);
194 r= read(0,buf+used,avail-used);
195 } while (r < 0 && errno == EINTR);
198 /* fake up final newline */
206 if (r < 0) sysfail("read stdin",errno);
210 space= strchr(buf,' ');
211 if (space) *space++= 0;
212 process_optarg(buf,0,space);
213 used -= (newline-buf);
214 memmove(buf,newline,used);
219 int main(int argc, const char *const *argv) {
220 struct timeval *tv, tvbuf;
225 fd_set readfds, writefds, exceptfds;
228 while ((arg= *++argv)) process_optarg(arg,&argv,0);
230 if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
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; }
241 query_done(qun_v,answer);
252 adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
253 r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
255 if (errno == EINTR) continue;
256 sysfail("select",errno);
258 adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
259 if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin();
262 if (fclose(stdout)) outerr();