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1 | /* |
2 | * adh-query.c |
3 | * - useful general-purpose resolver client program |
4 | * make queries and print answers |
5 | */ |
6 | /* |
7 | * This file is |
8 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
9 | * |
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> |
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" |
30 | |
31 | adns_state ads; |
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32 | struct outstanding_list outstanding; |
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33 | |
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34 | static unsigned long idcounter; |
35 | |
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36 | void ensure_adns_init(void) { |
37 | int r; |
38 | |
39 | if (ads) return; |
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40 | |
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41 | if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno); |
42 | r= adns_init(&ads, |
43 | adns_if_noautosys|adns_if_nosigpipe | |
44 | (ov_env ? 0 : adns_if_noenv) | |
45 | ov_verbose, |
46 | 0); |
47 | if (r) sysfail("adns_init",r); |
48 | } |
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49 | |
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50 | static void prep_query(struct query_node **qun_r, int *quflags_r) { |
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51 | struct query_node *qun; |
52 | char idbuf[20]; |
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53 | |
54 | if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line"); |
55 | ensure_adns_init(); |
56 | |
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57 | qun= malloc(sizeof(*qun)); |
58 | qun->pqfr= ov_pqfr; |
59 | if (ov_id) { |
60 | qun->id= xstrsave(ov_id); |
61 | } else { |
62 | sprintf(idbuf,"%lu",idcounter++); |
63 | idcounter &= 0x0fffffffflu; |
64 | qun->id= xstrsave(idbuf); |
65 | } |
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66 | |
67 | *quflags_r= |
68 | (ov_search ? adns_qf_search : 0) | |
69 | (ov_tcp ? adns_qf_usevc : 0) | |
70 | (ov_pqfr.show_owner ? adns_qf_owner : 0) | |
71 | (ov_qc_query ? adns_qf_quoteok_query : 0) | |
72 | (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) | |
73 | (ov_qc_cname ? 0 : adns_qf_quoteok_cname) | |
74 | ov_cname, |
75 | |
76 | *qun_r= qun; |
77 | } |
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78 | |
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79 | void of_ptr(const struct optioninfo *oi, const char *arg) { |
80 | struct query_node *qun; |
81 | int quflags, r; |
82 | struct sockaddr_in sa; |
83 | |
84 | memset(&sa,0,sizeof(sa)); |
85 | sa.sin_family= AF_INET; |
86 | if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg); |
87 | |
88 | prep_query(&qun,&quflags); |
89 | r= adns_submit_reverse(ads, |
90 | (struct sockaddr*)&sa, |
91 | ov_type == adns_r_none ? adns_r_ptr : ov_type, |
92 | quflags, |
93 | qun, |
94 | &qun->qu); |
95 | if (r) sysfail("adns_submit_reverse",r); |
96 | |
97 | LIST_LINK_TAIL(outstanding,qun); |
98 | } |
99 | |
100 | void query_do(const char *domain) { |
101 | struct query_node *qun; |
102 | int quflags, r; |
103 | |
104 | prep_query(&qun,&quflags); |
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105 | r= adns_submit(ads, domain, |
106 | ov_type == adns_r_none ? adns_r_addr : ov_type, |
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107 | quflags, |
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108 | qun, |
109 | &qun->qu); |
110 | if (r) sysfail("adns_submit",r); |
111 | |
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112 | LIST_LINK_TAIL(outstanding,qun); |
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113 | } |
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114 | |
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115 | static void dequeue_query(struct query_node *qun) { |
116 | LIST_UNLINK(outstanding,qun); |
117 | free(qun->id); |
118 | free(qun); |
119 | } |
120 | |
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121 | static void print_withspace(const char *str) { |
122 | if (printf("%s ", str) == EOF) outerr(); |
123 | } |
124 | |
125 | static void print_ttl(struct query_node *qun, adns_answer *answer) { |
126 | unsigned long ttl; |
127 | time_t now; |
128 | |
129 | switch (qun->pqfr.ttl) { |
130 | case tm_none: |
131 | return; |
132 | case tm_rel: |
133 | if (time(&now) == (time_t)-1) sysfail("get current time",errno); |
134 | ttl= answer->expires < now ? 0 : answer->expires - now; |
135 | break; |
136 | case tm_abs: |
137 | ttl= answer->expires; |
138 | break; |
139 | default: |
140 | abort(); |
141 | } |
142 | if (printf("%lu ",ttl) == EOF) outerr(); |
143 | } |
144 | |
145 | static void print_owner_ttl(struct query_node *qun, adns_answer *answer) { |
146 | if (qun->pqfr.show_owner) print_withspace(answer->owner); |
147 | print_ttl(qun,answer); |
148 | } |
149 | |
150 | static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) { |
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151 | static const adns_status statuspoints[]= { |
152 | adns_s_ok, |
153 | adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail, |
154 | adns_s_max_misconfig, adns_s_max_misquery |
155 | }; |
156 | |
157 | const adns_status *spp; |
158 | const char *statustypeabbrev, *statusabbrev, *statusstring; |
159 | int minrcode; |
160 | |
161 | statustypeabbrev= adns_errtypeabbrev(st); |
162 | for (minrcode=0, spp=statuspoints; |
163 | spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0])); |
164 | spp++) |
165 | if (st > *spp) minrcode++; |
166 | if (rcode < minrcode) rcode= minrcode; |
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167 | |
168 | statusabbrev= adns_errabbrev(st); |
169 | statusstring= adns_strerror(st); |
170 | assert(!strchr(statusstring,'"')); |
171 | |
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172 | if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev) |
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173 | == EOF) outerr(); |
174 | print_owner_ttl(qun,answer); |
175 | if (qun->pqfr.show_cname) |
176 | print_withspace(answer->cname ? answer->cname : "$"); |
177 | if (printf("\"%s\"\n", statusstring) == EOF) outerr(); |
178 | } |
179 | |
180 | void query_done(struct query_node *qun, adns_answer *answer) { |
181 | adns_status st, ist; |
182 | int rrn, nrrs; |
183 | const char *rrp, *realowner, *typename; |
184 | char *datastr; |
185 | |
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186 | st= answer->status; |
187 | nrrs= answer->nrrs; |
188 | if (ov_asynch) { |
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189 | if (printf("%s %d ", qun->id, nrrs) == EOF) outerr(); |
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190 | print_status(st,qun,answer); |
191 | } else { |
192 | if (st) { |
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193 | if (fputs("; failed ",stdout) == EOF) outerr(); |
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194 | print_status(st,qun,answer); |
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195 | } else if (qun->pqfr.show_cname && answer->cname) { |
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196 | print_owner_ttl(qun,answer); |
197 | if (printf("CNAME %s\n",answer->cname) == EOF) outerr(); |
198 | } |
199 | } |
200 | if (qun->pqfr.show_owner) { |
201 | realowner= answer->cname ? answer->cname : answer->owner;; |
202 | assert(realowner); |
203 | } else { |
204 | realowner= 0; |
205 | } |
206 | if (nrrs) { |
207 | for (rrn=0, rrp = answer->rrs.untyped; |
208 | rrn < nrrs; |
209 | rrn++, rrp += answer->rrsz) { |
210 | if (realowner) print_withspace(realowner); |
211 | print_ttl(qun,answer); |
212 | ist= adns_rr_info(answer->type, &typename, 0, 0, rrp, &datastr); |
213 | if (ist == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM); |
214 | assert(!ist); |
215 | if (qun->pqfr.show_type) print_withspace(typename); |
216 | if (printf("%s\n",datastr) == EOF) outerr(); |
217 | free(datastr); |
218 | } |
219 | } |
220 | if (fflush(stdout)) outerr(); |
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221 | free(answer); |
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222 | dequeue_query(qun); |
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223 | } |
224 | |
225 | void of_asynch_id(const struct optioninfo *oi, const char *arg) { |
226 | free(ov_id); |
227 | ov_id= xstrsave(arg); |
228 | } |
229 | |
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230 | void of_cancel_id(const struct optioninfo *oi, const char *arg) { |
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231 | struct query_node *qun; |
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232 | |
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233 | for (qun= outstanding.head; |
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234 | qun && strcmp(qun->id,arg); |
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235 | qun= qun->next); |
236 | if (!qun) return; |
237 | adns_cancel(qun->qu); |
238 | dequeue_query(qun); |
239 | } |