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1 | /* |
2 | * adh-main.c |
3 | * - useful general-purpose resolver client program |
4 | * main program and useful subroutines |
5 | */ |
6 | /* |
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7 | * This file is part of adns, which is |
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8 | * Copyright (C) 1997-2000,2003,2006,2014 Ian Jackson |
17cd4f48 |
9 | * Copyright (C) 2014 Mark Wooding |
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10 | * Copyright (C) 1999-2000,2003,2006 Tony Finch |
11 | * Copyright (C) 1991 Massachusetts Institute of Technology |
12 | * (See the file INSTALL for full details.) |
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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 |
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16 | * the Free Software Foundation; either version 3, or (at your option) |
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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 |
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25 | * along with this program; if not, write to the Free Software Foundation. |
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26 | */ |
27 | |
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28 | #include "adnshost.h" |
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29 | |
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30 | int rcode; |
31 | const char *config_text; |
32 | |
33 | static int used, avail; |
34 | static char *buf; |
35 | |
36 | void quitnow(int rc) { |
37 | if (ads) adns_finish(ads); |
38 | free(buf); |
39 | free(ov_id); |
40 | exit(rc); |
41 | } |
42 | |
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43 | void sysfail(const char *what, int errnoval) { |
44 | fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval)); |
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45 | quitnow(10); |
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46 | } |
47 | |
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48 | void usageerr(const char *fmt, ...) { |
49 | va_list al; |
50 | fputs("adnshost usage error: ",stderr); |
51 | va_start(al,fmt); |
52 | vfprintf(stderr,fmt,al); |
53 | va_end(al); |
54 | putc('\n',stderr); |
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55 | quitnow(11); |
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56 | } |
57 | |
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58 | void outerr(void) { |
59 | sysfail("write to stdout",errno); |
60 | } |
61 | |
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62 | void *xmalloc(size_t sz) { |
63 | void *p; |
64 | |
65 | p= malloc(sz); if (!p) sysfail("malloc",sz); |
66 | return p; |
67 | } |
68 | |
69 | char *xstrsave(const char *str) { |
70 | char *p; |
71 | |
72 | p= xmalloc(strlen(str)+1); |
73 | strcpy(p,str); |
74 | return p; |
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75 | } |
76 | |
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77 | void of_config(const struct optioninfo *oi, const char *arg, const char *arg2) { |
78 | config_text= arg; |
79 | } |
80 | |
2b1c6979 |
81 | void of_type(const struct optioninfo *oi, const char *arg, const char *arg2) { |
9fa14499 |
82 | static const struct typename { |
83 | adns_rrtype type; |
84 | const char *desc; |
85 | } typenames[]= { |
86 | /* enhanced versions */ |
87 | { adns_r_ns, "ns" }, |
88 | { adns_r_soa, "soa" }, |
89 | { adns_r_ptr, "ptr" }, |
90 | { adns_r_mx, "mx" }, |
91 | { adns_r_rp, "rp" }, |
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92 | { adns_r_srv, "srv" }, |
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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" }, |
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102 | { adns_r_aaaa, "aaaa" }, |
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103 | { adns_r_ns_raw, "ns-" }, |
104 | { adns_r_soa_raw, "soa-" }, |
105 | { adns_r_ptr_raw, "ptr-" }, |
106 | { adns_r_mx_raw, "mx-" }, |
107 | { adns_r_rp_raw, "rp-" }, |
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108 | { adns_r_srv_raw, "srv-" }, |
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109 | |
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110 | { adns_r_none, 0 } |
111 | }; |
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112 | |
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113 | const struct typename *tnp; |
2c6eb096 |
114 | unsigned long unknowntype; |
115 | char *ep; |
116 | |
117 | if (strlen(arg) > 4 && !memcmp(arg,"type",4) && |
118 | (unknowntype= strtoul(arg+4, &ep, 10), !*ep) && unknowntype < 65536) { |
119 | ov_type= unknowntype | adns_r_unknown; |
120 | return; |
121 | } |
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122 | |
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123 | for (tnp=typenames; |
124 | tnp->type && strcmp(arg,tnp->desc); |
125 | tnp++); |
126 | if (!tnp->type) usageerr("unknown RR type %s",arg); |
127 | ov_type= tnp->type; |
128 | } |
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129 | |
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130 | static void process_optarg(const char *arg, |
131 | const char *const **argv_p, |
132 | const char *value) { |
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133 | const struct optioninfo *oip; |
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134 | const char *arg2; |
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135 | int invert; |
136 | |
137 | if (arg[0] == '-' || arg[0] == '+') { |
138 | if (arg[0] == '-' && arg[1] == '-') { |
139 | if (!strncmp(arg,"--no-",5)) { |
140 | invert= 1; |
141 | oip= opt_findl(arg+5); |
142 | } else { |
143 | invert= 0; |
144 | oip= opt_findl(arg+2); |
145 | } |
146 | if (oip->type == ot_funcarg) { |
147 | arg= argv_p ? *++(*argv_p) : value; |
148 | if (!arg) usageerr("option --%s requires a value argument",oip->lopt); |
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149 | arg2= 0; |
150 | } else if (oip->type == ot_funcarg2) { |
151 | assert(argv_p); |
152 | arg= *++(*argv_p); |
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153 | arg2= arg ? *++(*argv_p) : 0; |
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154 | if (!arg || !arg2) |
155 | usageerr("option --%s requires two more arguments", oip->lopt); |
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156 | } else { |
157 | if (value) usageerr("option --%s does not take a value",oip->lopt); |
158 | arg= 0; |
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159 | arg2= 0; |
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160 | } |
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161 | opt_do(oip,invert,arg,arg2); |
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162 | } else if (arg[0] == '-' && arg[1] == 0) { |
163 | arg= argv_p ? *++(*argv_p) : value; |
164 | if (!arg) usageerr("option `-' must be followed by a domain"); |
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165 | query_do(arg); |
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166 | } else { /* arg[1] != '-', != '\0' */ |
167 | invert= (arg[0] == '+'); |
168 | ++arg; |
169 | while (*arg) { |
170 | oip= opt_finds(&arg); |
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171 | if (oip->type == ot_funcarg) { |
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172 | if (!*arg) { |
173 | arg= argv_p ? *++(*argv_p) : value; |
174 | if (!arg) usageerr("option -%s requires a value argument",oip->sopt); |
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175 | } else { |
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176 | if (value) usageerr("two values for option -%s given !",oip->sopt); |
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177 | } |
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178 | opt_do(oip,invert,arg,0); |
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179 | arg= ""; |
180 | } else { |
181 | if (value) usageerr("option -%s does not take a value",oip->sopt); |
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182 | opt_do(oip,invert,0,0); |
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183 | } |
184 | } |
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185 | } |
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186 | } else { /* arg[0] != '-' */ |
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187 | query_do(arg); |
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188 | } |
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189 | } |
190 | |
191 | static void read_stdin(void) { |
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192 | int anydone, r; |
193 | char *newline, *space; |
194 | |
195 | anydone= 0; |
196 | while (!anydone || used) { |
197 | while (!(newline= memchr(buf,'\n',used))) { |
198 | if (used == avail) { |
199 | avail += 20; avail <<= 1; |
200 | buf= realloc(buf,avail); |
201 | if (!buf) sysfail("realloc stdin buffer",errno); |
202 | } |
203 | do { |
204 | r= read(0,buf+used,avail-used); |
205 | } while (r < 0 && errno == EINTR); |
206 | if (r == 0) { |
207 | if (used) { |
208 | /* fake up final newline */ |
209 | buf[used++]= '\n'; |
210 | r= 1; |
211 | } else { |
212 | ov_pipe= 0; |
213 | return; |
214 | } |
215 | } |
216 | if (r < 0) sysfail("read stdin",errno); |
217 | used += r; |
218 | } |
219 | *newline++= 0; |
220 | space= strchr(buf,' '); |
221 | if (space) *space++= 0; |
222 | process_optarg(buf,0,space); |
223 | used -= (newline-buf); |
224 | memmove(buf,newline,used); |
225 | anydone= 1; |
226 | } |
227 | } |
228 | |
229 | int main(int argc, const char *const *argv) { |
230 | struct timeval *tv, tvbuf; |
231 | adns_query qu; |
232 | void *qun_v; |
233 | adns_answer *answer; |
234 | int r, maxfd; |
235 | fd_set readfds, writefds, exceptfds; |
236 | const char *arg; |
237 | |
238 | while ((arg= *++argv)) process_optarg(arg,&argv,0); |
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239 | |
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240 | if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help"); |
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241 | |
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242 | ensure_adns_init(); |
243 | |
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244 | for (;;) { |
245 | for (;;) { |
246 | qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0; |
247 | r= adns_check(ads,&qu,&answer,&qun_v); |
248 | if (r == EAGAIN) break; |
249 | if (r == ESRCH) { if (!ov_pipe) goto x_quit; else break; } |
250 | assert(!r); |
251 | query_done(qun_v,answer); |
252 | } |
253 | maxfd= 0; |
254 | FD_ZERO(&readfds); |
255 | FD_ZERO(&writefds); |
256 | FD_ZERO(&exceptfds); |
257 | if (ov_pipe) { |
258 | maxfd= 1; |
259 | FD_SET(0,&readfds); |
260 | } |
261 | tv= 0; |
262 | adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0); |
263 | r= select(maxfd, &readfds,&writefds,&exceptfds, tv); |
264 | if (r == -1) { |
265 | if (errno == EINTR) continue; |
266 | sysfail("select",errno); |
267 | } |
268 | adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0); |
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269 | if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin(); |
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270 | } |
271 | x_quit: |
272 | if (fclose(stdout)) outerr(); |
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273 | quitnow(rcode); |
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274 | } |