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1 | /* |
2 | * adh-main.c |
3 | * - useful general-purpose resolver client program |
4 | * main program and useful subroutines |
5 | */ |
6 | /* |
7 | * This file is |
3d5cde09 |
8 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
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9 | * |
10 | * It is part of adns, which is |
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11 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
bef232ae |
12 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
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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 | |
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29 | #include "adnshost.h" |
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30 | |
0ebff22d |
31 | int rcode; |
32 | const char *config_text; |
33 | |
34 | static int used, avail; |
35 | static char *buf; |
36 | |
37 | void quitnow(int rc) { |
38 | if (ads) adns_finish(ads); |
39 | free(buf); |
40 | free(ov_id); |
41 | exit(rc); |
42 | } |
43 | |
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44 | void sysfail(const char *what, int errnoval) { |
45 | fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval)); |
0ebff22d |
46 | quitnow(10); |
d1cff511 |
47 | } |
48 | |
e3f575ff |
49 | void usageerr(const char *fmt, ...) { |
50 | va_list al; |
51 | fputs("adnshost usage error: ",stderr); |
52 | va_start(al,fmt); |
53 | vfprintf(stderr,fmt,al); |
54 | va_end(al); |
55 | putc('\n',stderr); |
0ebff22d |
56 | quitnow(11); |
e3f575ff |
57 | } |
58 | |
57d68ed1 |
59 | void outerr(void) { |
60 | sysfail("write to stdout",errno); |
61 | } |
62 | |
e3f575ff |
63 | void *xmalloc(size_t sz) { |
64 | void *p; |
65 | |
66 | p= malloc(sz); if (!p) sysfail("malloc",sz); |
67 | return p; |
68 | } |
69 | |
70 | char *xstrsave(const char *str) { |
71 | char *p; |
72 | |
73 | p= xmalloc(strlen(str)+1); |
74 | strcpy(p,str); |
75 | return p; |
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76 | } |
77 | |
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78 | void of_config(const struct optioninfo *oi, const char *arg, const char *arg2) { |
79 | config_text= arg; |
80 | } |
81 | |
2b1c6979 |
82 | void of_type(const struct optioninfo *oi, const char *arg, const char *arg2) { |
9fa14499 |
83 | static const struct typename { |
84 | adns_rrtype type; |
85 | const char *desc; |
86 | } typenames[]= { |
87 | /* enhanced versions */ |
88 | { adns_r_ns, "ns" }, |
89 | { adns_r_soa, "soa" }, |
90 | { adns_r_ptr, "ptr" }, |
91 | { adns_r_mx, "mx" }, |
92 | { adns_r_rp, "rp" }, |
93 | { adns_r_addr, "addr" }, |
94 | |
95 | /* types with only one version */ |
96 | { adns_r_cname, "cname" }, |
97 | { adns_r_hinfo, "hinfo" }, |
98 | { adns_r_txt, "txt" }, |
99 | |
100 | /* raw versions */ |
101 | { adns_r_a, "a" }, |
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-" }, |
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107 | |
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108 | { adns_r_none, 0 } |
109 | }; |
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110 | |
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111 | const struct typename *tnp; |
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112 | |
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113 | for (tnp=typenames; |
114 | tnp->type && strcmp(arg,tnp->desc); |
115 | tnp++); |
116 | if (!tnp->type) usageerr("unknown RR type %s",arg); |
117 | ov_type= tnp->type; |
118 | } |
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119 | |
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120 | static void process_optarg(const char *arg, |
121 | const char *const **argv_p, |
122 | const char *value) { |
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123 | const struct optioninfo *oip; |
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124 | const char *arg2; |
9fa14499 |
125 | int invert; |
126 | |
127 | if (arg[0] == '-' || arg[0] == '+') { |
128 | if (arg[0] == '-' && arg[1] == '-') { |
129 | if (!strncmp(arg,"--no-",5)) { |
130 | invert= 1; |
131 | oip= opt_findl(arg+5); |
132 | } else { |
133 | invert= 0; |
134 | oip= opt_findl(arg+2); |
135 | } |
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); |
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139 | arg2= 0; |
140 | } else if (oip->type == ot_funcarg2) { |
141 | assert(argv_p); |
142 | arg= *++(*argv_p); |
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143 | arg2= arg ? *++(*argv_p) : 0; |
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144 | if (!arg || !arg2) |
145 | usageerr("option --%s requires two more arguments", oip->lopt); |
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146 | } else { |
147 | if (value) usageerr("option --%s does not take a value",oip->lopt); |
148 | arg= 0; |
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149 | arg2= 0; |
9fa14499 |
150 | } |
2b1c6979 |
151 | opt_do(oip,invert,arg,arg2); |
9fa14499 |
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"); |
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155 | query_do(arg); |
9fa14499 |
156 | } else { /* arg[1] != '-', != '\0' */ |
157 | invert= (arg[0] == '+'); |
158 | ++arg; |
159 | while (*arg) { |
160 | oip= opt_finds(&arg); |
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161 | if (oip->type == ot_funcarg) { |
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162 | if (!*arg) { |
163 | arg= argv_p ? *++(*argv_p) : value; |
164 | if (!arg) usageerr("option -%s requires a value argument",oip->sopt); |
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165 | } else { |
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166 | if (value) usageerr("two values for option -%s given !",oip->sopt); |
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167 | } |
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168 | opt_do(oip,invert,arg,0); |
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169 | arg= ""; |
170 | } else { |
171 | if (value) usageerr("option -%s does not take a value",oip->sopt); |
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172 | opt_do(oip,invert,0,0); |
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173 | } |
174 | } |
d1cff511 |
175 | } |
9fa14499 |
176 | } else { /* arg[0] != '-' */ |
d7449548 |
177 | query_do(arg); |
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178 | } |
9fa14499 |
179 | } |
180 | |
181 | static void read_stdin(void) { |
9fa14499 |
182 | int anydone, r; |
183 | char *newline, *space; |
184 | |
185 | anydone= 0; |
186 | while (!anydone || used) { |
187 | while (!(newline= memchr(buf,'\n',used))) { |
188 | if (used == avail) { |
189 | avail += 20; avail <<= 1; |
190 | buf= realloc(buf,avail); |
191 | if (!buf) sysfail("realloc stdin buffer",errno); |
192 | } |
193 | do { |
194 | r= read(0,buf+used,avail-used); |
195 | } while (r < 0 && errno == EINTR); |
196 | if (r == 0) { |
197 | if (used) { |
198 | /* fake up final newline */ |
199 | buf[used++]= '\n'; |
200 | r= 1; |
201 | } else { |
202 | ov_pipe= 0; |
203 | return; |
204 | } |
205 | } |
206 | if (r < 0) sysfail("read stdin",errno); |
207 | used += r; |
208 | } |
209 | *newline++= 0; |
210 | space= strchr(buf,' '); |
211 | if (space) *space++= 0; |
212 | process_optarg(buf,0,space); |
213 | used -= (newline-buf); |
214 | memmove(buf,newline,used); |
215 | anydone= 1; |
216 | } |
217 | } |
218 | |
219 | int main(int argc, const char *const *argv) { |
220 | struct timeval *tv, tvbuf; |
221 | adns_query qu; |
222 | void *qun_v; |
223 | adns_answer *answer; |
224 | int r, maxfd; |
225 | fd_set readfds, writefds, exceptfds; |
226 | const char *arg; |
227 | |
228 | while ((arg= *++argv)) process_optarg(arg,&argv,0); |
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229 | |
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230 | if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help"); |
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231 | |
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232 | ensure_adns_init(); |
233 | |
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234 | for (;;) { |
235 | for (;;) { |
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; } |
240 | assert(!r); |
241 | query_done(qun_v,answer); |
242 | } |
243 | maxfd= 0; |
244 | FD_ZERO(&readfds); |
245 | FD_ZERO(&writefds); |
246 | FD_ZERO(&exceptfds); |
247 | if (ov_pipe) { |
248 | maxfd= 1; |
249 | FD_SET(0,&readfds); |
250 | } |
251 | tv= 0; |
252 | adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0); |
253 | r= select(maxfd, &readfds,&writefds,&exceptfds, tv); |
254 | if (r == -1) { |
255 | if (errno == EINTR) continue; |
256 | sysfail("select",errno); |
257 | } |
258 | adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0); |
9fa14499 |
259 | if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin(); |
57d68ed1 |
260 | } |
261 | x_quit: |
262 | if (fclose(stdout)) outerr(); |
0ebff22d |
263 | quitnow(rcode); |
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264 | } |