1 | /* |
2 | * Copyright (c) 1995-1999 by Internet Software Consortium. |
3 | * |
4 | * Permission to use, copy, modify, and distribute this software for any |
5 | * purpose with or without fee is hereby granted, provided that the above |
6 | * copyright notice and this permission notice appear in all copies. |
7 | * |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
15 | * SOFTWARE. |
16 | */ |
17 | |
18 | #include <sys/types.h> |
19 | #include <sys/param.h> |
20 | #include <sys/socket.h> |
21 | #include <sys/time.h> |
22 | |
23 | #include <netinet/in.h> |
24 | #include <arpa/inet.h> |
25 | #include <arpa/nameser.h> |
26 | |
27 | #include <ctype.h> |
28 | #include <netdb.h> |
29 | #include <resolv.h> |
30 | #include <stdio.h> |
31 | #include <stdlib.h> |
32 | #include <string.h> |
33 | #include <unistd.h> |
34 | |
35 | const char *_res_opcodes[] = { |
36 | "QUERY" , |
37 | "IQUERY" , |
38 | "CQUERYM" , |
39 | "CQUERYU" , /* experimental */ |
40 | "NOTIFY" , /* experimental */ |
41 | "UPDATE" , |
42 | "6" , |
43 | "7" , |
44 | "8" , |
45 | "9" , |
46 | "10" , |
47 | "11" , |
48 | "12" , |
49 | "13" , |
50 | "ZONEINIT" , |
51 | "ZONEREF" , |
52 | }; |
53 | libresolv_hidden_data_def (_res_opcodes) |
54 | |
55 | void |
56 | p_query(const u_char *msg) { |
57 | fp_query(msg, stdout); |
58 | } |
59 | |
60 | void |
61 | fp_query(const u_char *msg, FILE *file) { |
62 | fp_nquery(msg, PACKETSZ, file); |
63 | } |
64 | libresolv_hidden_def (fp_query) |
65 | |
66 | void |
67 | fp_nquery(const u_char *msg, int len, FILE *file) { |
68 | if (__res_maybe_init (&_res, 0) == -1) |
69 | return; |
70 | |
71 | res_pquery(&_res, msg, len, file); |
72 | } |
73 | libresolv_hidden_def (fp_nquery) |
74 | |
75 | int |
76 | res_mkquery(int op, /* opcode of query */ |
77 | const char *dname, /* domain name */ |
78 | int class, int type, /* class and type of query */ |
79 | const u_char *data, /* resource record data */ |
80 | int datalen, /* length of data */ |
81 | const u_char *newrr_in, /* new rr for modify or append */ |
82 | u_char *buf, /* buffer to put query */ |
83 | int buflen) /* size of buffer */ |
84 | { |
85 | if (__res_maybe_init (&_res, 1) == -1) { |
86 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
87 | return (-1); |
88 | } |
89 | return (res_nmkquery(&_res, op, dname, class, type, |
90 | data, datalen, |
91 | newrr_in, buf, buflen)); |
92 | } |
93 | |
94 | int |
95 | res_query(const char *name, /* domain name */ |
96 | int class, int type, /* class and type of query */ |
97 | u_char *answer, /* buffer to put answer */ |
98 | int anslen) /* size of answer buffer */ |
99 | { |
100 | if (__res_maybe_init (&_res, 1) == -1) { |
101 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
102 | return (-1); |
103 | } |
104 | return (res_nquery(&_res, name, class, type, answer, anslen)); |
105 | } |
106 | |
107 | void |
108 | res_send_setqhook(res_send_qhook hook) { |
109 | _res.qhook = hook; |
110 | } |
111 | |
112 | void |
113 | res_send_setrhook(res_send_rhook hook) { |
114 | _res.rhook = hook; |
115 | } |
116 | |
117 | int |
118 | res_isourserver(const struct sockaddr_in *inp) { |
119 | return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp)); |
120 | } |
121 | |
122 | int |
123 | res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { |
124 | if (__res_maybe_init (&_res, 1) == -1) { |
125 | /* errno should have been set by res_init() in this case. */ |
126 | return (-1); |
127 | } |
128 | |
129 | return (res_nsend(&_res, buf, buflen, ans, anssiz)); |
130 | } |
131 | |
132 | |
133 | void |
134 | res_close(void) { |
135 | /* |
136 | * Some stupid programs out there call res_close() before res_init(). |
137 | * Since _res._vcsock isn't explicitly initialized, these means that |
138 | * we could do a close(0), which might lead to some security problems. |
139 | * Therefore we check if res_init() was called before by looking at |
140 | * the RES_INIT bit in _res.options. If it hasn't been set we bail out |
141 | * early. */ |
142 | if ((_res.options & RES_INIT) == 0) |
143 | return; |
144 | /* We don't free the name server addresses because we never |
145 | did it and it would be done implicitly on shutdown. */ |
146 | __res_iclose(&_res, false); |
147 | } |
148 | |
149 | int |
150 | res_search(const char *name, /* domain name */ |
151 | int class, int type, /* class and type of query */ |
152 | u_char *answer, /* buffer to put answer */ |
153 | int anslen) /* size of answer */ |
154 | { |
155 | if (__res_maybe_init (&_res, 1) == -1) { |
156 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
157 | return (-1); |
158 | } |
159 | |
160 | return (res_nsearch(&_res, name, class, type, answer, anslen)); |
161 | } |
162 | |
163 | int |
164 | res_querydomain(const char *name, |
165 | const char *domain, |
166 | int class, int type, /* class and type of query */ |
167 | u_char *answer, /* buffer to put answer */ |
168 | int anslen) /* size of answer */ |
169 | { |
170 | if (__res_maybe_init (&_res, 1) == -1) { |
171 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
172 | return (-1); |
173 | } |
174 | |
175 | return (res_nquerydomain(&_res, name, domain, |
176 | class, type, |
177 | answer, anslen)); |
178 | } |
179 | |
180 | const char * |
181 | hostalias(const char *name) { |
182 | static char abuf[MAXDNAME]; |
183 | |
184 | return (res_hostalias(&_res, name, abuf, sizeof abuf)); |
185 | } |
186 | libresolv_hidden_def (hostalias) |
187 | |
188 | |
189 | |
190 | #include <shlib-compat.h> |
191 | |
192 | #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2) |
193 | # undef res_mkquery |
194 | # undef res_query |
195 | # undef res_querydomain |
196 | # undef res_search |
197 | weak_alias (__res_mkquery, res_mkquery); |
198 | weak_alias (__res_query, res_query); |
199 | weak_alias (__res_querydomain, res_querydomain); |
200 | weak_alias (__res_search, res_search); |
201 | #endif |
202 | |