3 * - useful general-purpose resolver client program
4 * option handling tables etc.
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 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 int ov_env=1, ov_pipe=0, ov_asynch=0;
33 adns_rrtype ov_type= adns_r_none;
34 int ov_search=0, ov_qc_query=0, ov_qc_anshost=0, ov_qc_cname=1;
35 int ov_tcp=0, ov_cname=0, ov_format=fmt_default;
37 struct perqueryflags_remember ov_pqfr = { 1,1,1, tm_none };
39 static const struct optioninfo global_options[]= {
40 { ot_desconly, "global binary options:" },
41 { ot_flag, "Do not look at environment variables at all",
42 "e", "env", &ov_env, 0 },
43 { ot_flag, "Read queries on stdin instead of using args",
44 "f", "pipe", &ov_pipe, 1 },
45 { ot_flag, "Allow answers to be reordered",
46 "a", "asynch", &ov_asynch, 1 },
48 { ot_desconly, "answer/error output format and destination (see below):" },
49 { ot_value, "Answers to stdout, errors as messages to stderr (default)",
50 "Fs", "fmt-simple", &ov_format, fmt_simple },
51 { ot_value, "Answers and errors both to stdout in parseable format",
52 "Fi", "fmt-inline", &ov_format, fmt_inline },
53 { ot_value, "Fully-parseable output format (default for --asynch)",
54 "Fa", "fmt-asynch", &ov_format, fmt_asynch },
56 { ot_desconly, "global verbosity level:" },
57 { ot_value, "Do not print anything to stderr",
58 "Vq", "quiet", &ov_verbose, adns_if_noerrprint },
59 { ot_value, "Report unexpected kinds of problem only (default)",
60 "Vn", "no-quiet", &ov_verbose, 0 },
61 { ot_value, "Debugging mode",
62 "Vd", "debug", &ov_verbose, adns_if_debug },
64 { ot_desconly, "other global options:" },
65 { ot_funcarg, "Configuration to use instead of /etc/resolv.conf",
66 0, "config", 0,0, of_config, "<config-text>" },
67 { ot_func, "Print usage information",
68 0, "help", 0,0, of_help },
73 static const struct optioninfo perquery_options[]= {
74 { ot_desconly, "per-query options:" },
75 { ot_funcarg, "Query type (see below)",
76 "t", "type", 0,0, &of_type, "type" },
77 { ot_funcarg, "Do reverse query (address -> name lookup)",
78 "i", "ptr", 0,0, &of_ptr, "addr" },
79 { ot_funcarg2, "Lookup in in-addr-like `zone' (eg MAPS RBL)",
80 0, "reverse", 0,0, &of_reverse, "addr","zone" },
82 { ot_desconly, "per-query binary options:" },
83 { ot_flag, "Use the search list",
84 "s", "search", &ov_search, 1 },
85 { ot_flag, "Let query domains contain quote-requiring chars",
86 "Qq", "qc-query", &ov_qc_query, 1 },
87 { ot_flag, "Let hostnames in answers contain ...",
88 "Qa", "qc-anshost", &ov_qc_anshost, 1 },
89 { ot_flag, "Prevent CNAME target domains from containing ...",
90 "Qc", "qc-cname", &ov_qc_cname, 0 },
91 { ot_flag, "Force use of a virtual circuit",
92 "u", "tcp", &ov_tcp, 1 },
93 { ot_flag, "Do not display owner name in output",
94 "Do", "show-owner", &ov_pqfr.show_owner, 0 },
95 { ot_flag, "Do not display RR type in output",
96 "Dt", "show-type", &ov_pqfr.show_type, 0 },
97 { ot_flag, "Do not display CNAME target in output",
98 "Dc", "show-cname", &ov_pqfr.show_cname, 0 },
100 { ot_desconly, "per-query TTL mode (NB TTL is minimum across all info in reply):" },
101 { ot_value, "Show the TTL as a TTL",
102 "Tt", "ttl-ttl", &ov_pqfr.ttl, tm_rel },
103 { ot_value, "Show the TTL as a time_t when the data might expire",
104 "Ta", "ttl-abs", &ov_pqfr.ttl, tm_abs },
105 { ot_value, "Do not show the TTL (default)",
106 "Tn", "no-ttl", &ov_pqfr.ttl, tm_none },
108 { ot_desconly, "per-query CNAME handling mode:" },
109 { ot_value, "Call it an error if a CNAME is found",
110 "Cf", "cname-reject", &ov_cname, adns_qf_cname_forbid },
111 { ot_value, "Allow references to CNAMEs in other RRs",
112 "Cl", "cname-loose", &ov_cname, adns_qf_cname_loose },
113 { ot_value, "CNAME ok for query domain, but not in RRs (default)",
114 "Cs", "cname-ok", &ov_cname, 0 },
116 { ot_desconly, "asynchronous/pipe mode options:" },
117 { ot_funcarg, "Set <id>, default is decimal sequence starting 0",
118 0, "asynch-id", 0,0, &of_asynch_id, "id" },
119 { ot_funcarg, "Cancel the query with id <id> (no error if not found)",
120 0, "cancel-id", 0,0, &of_cancel_id, "id" },
125 static void printusage(void) {
126 static const struct optioninfo *const all_optiontables[]= {
127 global_options, perquery_options, 0
130 const struct optioninfo *const *oiap, *oip=0;
131 int maxsopt, maxlopt, l;
135 for (oiap=all_optiontables; *oiap; oiap++) {
136 for (oip=*oiap; oip->type != ot_end; oip++) {
137 if (oip->type == ot_funcarg) continue;
138 if (oip->sopt) { l= strlen(oip->sopt); if (l>maxsopt) maxsopt= l; }
140 l= strlen(oip->lopt);
141 if (oip->type == ot_flag && !oip->value) l+= 3;
142 if (l>maxlopt) maxlopt= l;
147 fputs("usage: adnshost [global-opts] [query-opts] query-domain\n"
148 " [[query-opts] query-domain ...]\n"
149 " adnshost [global-opts] [query-opts] -f|--pipe\n",
152 for (oiap=all_optiontables; *oiap; oiap++) {
154 for (oip=*oiap; oip->type != ot_end; oip++) {
159 printf(" +%-*s --no-%-*s %s\n",
161 maxlopt-2, oip->lopt,
164 printf(" --no-%-*s %s\n",
165 maxlopt+maxsopt+1, oip->lopt,
170 case ot_value: case ot_func: /* fall through */
172 printf(" -%-*s --%-*s %s\n",
174 maxlopt+1, oip->lopt,
177 printf(" --%-*s %s\n",
178 maxlopt+maxsopt+3, oip->lopt,
184 l= (maxlopt + maxsopt - 9 -
185 (strlen(oip->sopt) + strlen(oip->lopt) + 2*strlen(oip->argdesc)));
186 printf(" -%s<%s> / --%s <%s>%*s%s\n",
187 oip->sopt, oip->argdesc, oip->lopt, oip->argdesc,
191 l= (maxlopt + maxsopt + 1 -
192 (strlen(oip->lopt) + strlen(oip->argdesc)));
193 printf(" --%s <%s>%*s%s\n",
194 oip->lopt, oip->argdesc,
201 l= (maxlopt + maxsopt - 2 -
202 (strlen(oip->lopt) + strlen(oip->argdesc) + strlen(oip->argdesc2)));
203 printf(" --%s <%s> <%s>%*s%s\n",
204 oip->lopt, oip->argdesc, oip->argdesc2,
209 printf("%s\n", oip->desc);
217 printf("\nEscaping domains which might start with `-':\n"
218 " - %-*s Next argument is a domain, but more options may follow\n",
219 maxlopt+maxsopt+3, "<domain>");
222 "Query domains should always be quoted according to master file format.\n"
224 "For binary options, --FOO and --no-FOO are opposites, as are\n"
225 "-X and +X. In each case the default is the one not listed.\n"
226 "Per query options stay set a particular way until they are reset,\n"
227 "whether they appear on the command line or on stdin.\n"
228 "All global options must preceed the first query domain.\n"
230 "With -f, the input should be lines with either an option, possibly\n"
231 "with a value argument (separated from the option by a space if it's a long\n"
232 "option), or a domain (possibly preceded by a hyphen and a space to\n"
233 "distinguish it from an option).\n"
235 "Output format is master file format without class or TTL by default:\n"
236 " [<owner>] [<ttl>] [<type>] <data>\n"
237 "or if the <owner> domain refers to a CNAME and --show-cname is on\n"
238 " [<owner>] [<ttl>] CNAME <cname>\n"
239 " [<cname>] [<ttl>] <type> <data>\n"
240 "When a query fails you get an error message to stderr (with --fmt-simple).\n"
241 "Specify --fmt-inline for lines like this (broken here for readability):\n"
242 " ; failed <statustype> <statusnum> <statusabbrev> \\\n"
243 " [<owner>] [<ttl>] [<cname>] \"<status string>\"\n"
244 "If you use --fmt-asynch, which is the default for --asynch,\n"
245 "each answer (success or failure) is preceded by a line\n"
246 " <id> <nrrs> <statustype> <statusnum> <statusabbrev> \\\n"
247 " [<owner>] [<ttl>] [<cname>] \"<status string>\"\n"
248 "where <nrrs> is the number of RRs that follow and <cname> will be `$' or\n"
249 "the CNAME target; the CNAME indirection and error formats above are not used.\n"
253 " 1-6 at least one query failed with statustype:\n"
255 " 2 remotefail ) temporary errors\n"
256 " 3 tempfail __)_________________\n"
258 " 5 misquery ) permanent errors\n"
260 " 10 system trouble\n"
261 " 11 usage problems\n"
263 "Query types (see adns.h; default is addr):\n"
264 " ns soa ptr mx rp addr - enhanced versions\n"
265 " cname hinfo txt - types with only one version\n"
266 " a ns- soa- ptr- mx- rp- - _raw versions\n"
267 "Default is addr, or ptr for -i/--ptr queries\n",
269 if (ferror(stdout)) sysfail("write usage message",errno);
272 void of_help(const struct optioninfo *oi, const char *arg, const char *arg2) {
274 if (fclose(stdout)) sysfail("finish writing output",errno);
278 typedef int comparer_type(const char **optp, const struct optioninfo *entry);
280 static int oc_long(const char **optp, const struct optioninfo *entry) {
281 return entry->lopt && !strcmp(*optp,entry->lopt);
284 static int oc_short(const char **optp, const struct optioninfo *entry) {
291 if (memcmp(*optp,sopt,l)) return 0;
296 static const struct optioninfo *find1(const char **optp,
297 const struct optioninfo *table,
298 comparer_type *comparer) {
300 if (table->type == ot_end) return 0;
301 if (comparer(optp,table)) return table;
306 static const struct optioninfo *find(const char **optp,
308 comparer_type *comparer) {
309 const struct optioninfo *oip;
313 oip= find1(optp,perquery_options,comparer);
315 oip= find1(optp,global_options,comparer);
316 if (!oip) usageerr("unknown option %s%s",prefix,opt);
317 if (ads) usageerr("global option %s%s specified after query domain(s)",prefix,opt);
321 const struct optioninfo *opt_findl(const char *opt) { return find(&opt,"--",oc_long); }
322 const struct optioninfo *opt_finds(const char **optp) { return find(optp,"-",oc_short); }
324 static void noninvert(const struct optioninfo *oip) NONRETURNING;
325 static void noninvert(const struct optioninfo *oip) {
326 usageerr("option %s%s%s%s%s may not be inverted",
327 oip->sopt ? "-" : "", oip->sopt ? oip->sopt : "",
328 oip->lopt && oip->sopt ? " / " : "",
329 oip->lopt ? "--" : "", oip->lopt ? oip->lopt : "");
332 void opt_do(const struct optioninfo *oip, int invert,
333 const char *arg, const char *arg2) {
337 *oip->storep= !invert;
341 if (invert) noninvert(oip);
342 *oip->storep= oip->value;
344 case ot_func: case ot_funcarg: case ot_funcarg2:
345 if (invert) noninvert(oip);
346 oip->func(oip,arg,arg2);