[444] | 1 | /* |
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| 2 | * Copyright (c) 1995-1999 by Internet Software Consortium. |
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| 3 | * |
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| 4 | * Permission to use, copy, modify, and distribute this software for any |
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| 5 | * purpose with or without fee is hereby granted, provided that the above |
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| 6 | * copyright notice and this permission notice appear in all copies. |
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| 7 | * |
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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| 9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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| 10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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| 11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 15 | * SOFTWARE. |
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| 16 | */ |
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| 17 | |
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| 18 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 19 | static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $"; |
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| 20 | #endif /* LIBC_SCCS and not lint */ |
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| 21 | |
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| 22 | #include <sys/types.h> |
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| 23 | #include <sys/param.h> |
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| 24 | #include <sys/socket.h> |
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| 25 | #include <sys/time.h> |
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| 26 | |
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| 27 | #include <netinet/in.h> |
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| 28 | #include <arpa/inet.h> |
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| 29 | #include <arpa/nameser.h> |
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| 30 | |
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| 31 | #include <ctype.h> |
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| 32 | #include <netdb.h> |
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| 33 | #include <resolv.h> |
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| 34 | #ifdef BIND_UPDATE |
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| 35 | #include <res_update.h> |
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| 36 | #endif |
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| 37 | #include <stdio.h> |
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| 38 | #include <stdlib.h> |
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| 39 | #include <string.h> |
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| 40 | #include <unistd.h> |
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| 41 | #include "libc-symbols.h" |
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| 42 | |
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| 43 | const char *_res_opcodes[] = { |
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| 44 | "QUERY", |
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| 45 | "IQUERY", |
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| 46 | "CQUERYM", |
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| 47 | "CQUERYU", /* experimental */ |
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| 48 | "NOTIFY", /* experimental */ |
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| 49 | "UPDATE", |
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| 50 | "6", |
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| 51 | "7", |
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| 52 | "8", |
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| 53 | "9", |
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| 54 | "10", |
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| 55 | "11", |
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| 56 | "12", |
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| 57 | "13", |
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| 58 | "ZONEINIT", |
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| 59 | "ZONEREF", |
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| 60 | }; |
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| 61 | libresolv_hidden_data_def (_res_opcodes) |
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| 62 | |
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| 63 | #ifdef BIND_UPDATE |
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| 64 | const char *_res_sectioncodes[] attribute_hidden = { |
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| 65 | "ZONE", |
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| 66 | "PREREQUISITES", |
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| 67 | "UPDATE", |
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| 68 | "ADDITIONAL", |
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| 69 | }; |
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| 70 | #endif |
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| 71 | |
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| 72 | #ifndef __BIND_NOSTATIC |
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| 73 | #ifdef _LIBC |
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| 74 | /* The definition has been moved to res_libc.c. */ |
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| 75 | #else |
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| 76 | #undef _res |
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| 77 | struct __res_state _res |
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| 78 | # if defined(__BIND_RES_TEXT) |
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| 79 | = { RES_TIMEOUT, } /* Motorola, et al. */ |
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| 80 | # endif |
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| 81 | ; |
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| 82 | #endif |
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| 83 | |
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| 84 | /* Proto. */ |
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| 85 | #ifndef _LIBC |
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| 86 | int res_ourserver_p(const res_state, const struct sockaddr_in *); |
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| 87 | void res_pquery(const res_state, const u_char *, int, FILE *); |
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| 88 | #endif |
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| 89 | |
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| 90 | #ifndef _LIBC |
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| 91 | /* Moved to res_libc.c since res_init() should go into libc.so but the |
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| 92 | rest of this file not. */ |
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| 93 | int |
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| 94 | res_init(void) { |
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| 95 | extern int __res_vinit(res_state, int); |
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| 96 | |
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| 97 | /* |
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| 98 | * These three fields used to be statically initialized. This made |
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| 99 | * it hard to use this code in a shared library. It is necessary, |
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| 100 | * now that we're doing dynamic initialization here, that we preserve |
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| 101 | * the old semantics: if an application modifies one of these three |
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| 102 | * fields of _res before res_init() is called, res_init() will not |
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| 103 | * alter them. Of course, if an application is setting them to |
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| 104 | * _zero_ before calling res_init(), hoping to override what used |
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| 105 | * to be the static default, we can't detect it and unexpected results |
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| 106 | * will follow. Zero for any of these fields would make no sense, |
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| 107 | * so one can safely assume that the applications were already getting |
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| 108 | * unexpected results. |
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| 109 | * |
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| 110 | * _res.options is tricky since some apps were known to diddle the bits |
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| 111 | * before res_init() was first called. We can't replicate that semantic |
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| 112 | * with dynamic initialization (they may have turned bits off that are |
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| 113 | * set in RES_DEFAULT). Our solution is to declare such applications |
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| 114 | * "broken". They could fool us by setting RES_INIT but none do (yet). |
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| 115 | */ |
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| 116 | if (!_res.retrans) |
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| 117 | _res.retrans = RES_TIMEOUT; |
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| 118 | if (!_res.retry) |
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| 119 | _res.retry = 4; |
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| 120 | if (!(_res.options & RES_INIT)) |
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| 121 | _res.options = RES_DEFAULT; |
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| 122 | |
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| 123 | /* |
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| 124 | * This one used to initialize implicitly to zero, so unless the app |
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| 125 | * has set it to something in particular, we can randomize it now. |
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| 126 | */ |
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| 127 | if (!_res.id) |
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| 128 | _res.id = res_randomid(); |
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| 129 | |
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| 130 | return (__res_vinit(&_res, 1)); |
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| 131 | } |
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| 132 | #endif |
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| 133 | |
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| 134 | void |
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| 135 | p_query(const u_char *msg) { |
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| 136 | fp_query(msg, stdout); |
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| 137 | } |
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| 138 | |
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| 139 | void |
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| 140 | fp_query(const u_char *msg, FILE *file) { |
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| 141 | fp_nquery(msg, PACKETSZ, file); |
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| 142 | } |
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| 143 | libresolv_hidden_def (fp_query) |
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| 144 | |
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| 145 | void |
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| 146 | fp_nquery(const u_char *msg, int len, FILE *file) { |
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| 147 | if (__res_maybe_init (&_res, 0) == -1) |
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| 148 | return; |
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| 149 | |
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| 150 | res_pquery(&_res, msg, len, file); |
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| 151 | } |
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| 152 | libresolv_hidden_def (fp_nquery) |
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| 153 | |
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| 154 | int |
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| 155 | res_mkquery(int op, /* opcode of query */ |
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| 156 | const char *dname, /* domain name */ |
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| 157 | int class, int type, /* class and type of query */ |
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| 158 | const u_char *data, /* resource record data */ |
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| 159 | int datalen, /* length of data */ |
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| 160 | const u_char *newrr_in, /* new rr for modify or append */ |
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| 161 | u_char *buf, /* buffer to put query */ |
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| 162 | int buflen) /* size of buffer */ |
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| 163 | { |
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| 164 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 165 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 166 | return (-1); |
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| 167 | } |
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| 168 | return (res_nmkquery(&_res, op, dname, class, type, |
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| 169 | data, datalen, |
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| 170 | newrr_in, buf, buflen)); |
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| 171 | } |
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| 172 | |
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| 173 | #ifdef BIND_UPDATE |
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| 174 | int |
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| 175 | res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { |
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| 176 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 177 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 178 | return (-1); |
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| 179 | } |
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| 180 | |
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| 181 | return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); |
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| 182 | } |
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| 183 | #endif |
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| 184 | |
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| 185 | int |
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| 186 | res_query(const char *name, /* domain name */ |
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| 187 | int class, int type, /* class and type of query */ |
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| 188 | u_char *answer, /* buffer to put answer */ |
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| 189 | int anslen) /* size of answer buffer */ |
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| 190 | { |
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| 191 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 192 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 193 | return (-1); |
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| 194 | } |
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| 195 | return (res_nquery(&_res, name, class, type, answer, anslen)); |
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| 196 | } |
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| 197 | |
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| 198 | void |
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| 199 | res_send_setqhook(res_send_qhook hook) { |
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| 200 | _res.qhook = hook; |
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| 201 | } |
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| 202 | |
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| 203 | void |
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| 204 | res_send_setrhook(res_send_rhook hook) { |
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| 205 | _res.rhook = hook; |
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| 206 | } |
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| 207 | |
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| 208 | int |
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| 209 | res_isourserver(const struct sockaddr_in *inp) { |
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| 210 | return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp)); |
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| 211 | } |
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| 212 | |
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| 213 | int |
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| 214 | res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { |
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| 215 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 216 | /* errno should have been set by res_init() in this case. */ |
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| 217 | return (-1); |
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| 218 | } |
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| 219 | |
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| 220 | return (res_nsend(&_res, buf, buflen, ans, anssiz)); |
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| 221 | } |
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| 222 | |
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| 223 | #ifndef _LIBC |
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| 224 | int |
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| 225 | res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, |
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| 226 | u_char *ans, int anssiz) |
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| 227 | { |
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| 228 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 229 | /* errno should have been set by res_init() in this case. */ |
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| 230 | return (-1); |
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| 231 | } |
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| 232 | |
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| 233 | return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); |
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| 234 | } |
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| 235 | #endif |
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| 236 | |
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| 237 | void |
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| 238 | res_close(void) { |
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| 239 | #ifdef _LIBC |
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| 240 | /* |
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| 241 | * Some stupid programs out there call res_close() before res_init(). |
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| 242 | * Since _res._vcsock isn't explicitly initialized, these means that |
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| 243 | * we could do a close(0), which might lead to some security problems. |
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| 244 | * Therefore we check if res_init() was called before by looking at |
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| 245 | * the RES_INIT bit in _res.options. If it hasn't been set we bail out |
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| 246 | * early. */ |
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| 247 | if ((_res.options & RES_INIT) == 0) |
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| 248 | return; |
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| 249 | #endif |
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| 250 | res_nclose(&_res); |
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| 251 | } |
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| 252 | |
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| 253 | #ifdef BIND_UPDATE |
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| 254 | int |
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| 255 | res_update(ns_updrec *rrecp_in) { |
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| 256 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 257 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 258 | return (-1); |
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| 259 | } |
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| 260 | |
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| 261 | return (res_nupdate(&_res, rrecp_in, NULL)); |
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| 262 | } |
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| 263 | #endif |
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| 264 | |
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| 265 | int |
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| 266 | res_search(const char *name, /* domain name */ |
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| 267 | int class, int type, /* class and type of query */ |
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| 268 | u_char *answer, /* buffer to put answer */ |
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| 269 | int anslen) /* size of answer */ |
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| 270 | { |
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| 271 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 272 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 273 | return (-1); |
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| 274 | } |
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| 275 | |
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| 276 | return (res_nsearch(&_res, name, class, type, answer, anslen)); |
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| 277 | } |
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| 278 | |
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| 279 | int |
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| 280 | res_querydomain(const char *name, |
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| 281 | const char *domain, |
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| 282 | int class, int type, /* class and type of query */ |
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| 283 | u_char *answer, /* buffer to put answer */ |
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| 284 | int anslen) /* size of answer */ |
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| 285 | { |
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| 286 | if (__res_maybe_init (&_res, 1) == -1) { |
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| 287 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
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| 288 | return (-1); |
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| 289 | } |
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| 290 | |
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| 291 | return (res_nquerydomain(&_res, name, domain, |
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| 292 | class, type, |
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| 293 | answer, anslen)); |
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| 294 | } |
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| 295 | |
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| 296 | const char * |
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| 297 | hostalias(const char *name) { |
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| 298 | static char abuf[MAXDNAME]; |
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| 299 | |
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| 300 | return (res_hostalias(&_res, name, abuf, sizeof abuf)); |
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| 301 | } |
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| 302 | libresolv_hidden_def (hostalias) |
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| 303 | |
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| 304 | #ifdef ultrix |
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| 305 | int |
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| 306 | local_hostname_length(const char *hostname) { |
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| 307 | int len_host, len_domain; |
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| 308 | |
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| 309 | if (!*_res.defdname) |
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| 310 | res_init(); |
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| 311 | len_host = strlen(hostname); |
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| 312 | len_domain = strlen(_res.defdname); |
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| 313 | if (len_host > len_domain && |
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| 314 | !strcasecmp(hostname + len_host - len_domain, _res.defdname) && |
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| 315 | hostname[len_host - len_domain - 1] == '.') |
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| 316 | return (len_host - len_domain - 1); |
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| 317 | return (0); |
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| 318 | } |
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| 319 | #endif /*ultrix*/ |
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| 320 | |
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| 321 | #endif |
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| 322 | |
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| 323 | |
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| 324 | #include <shlib-compat.h> |
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| 325 | |
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| 326 | #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2) |
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| 327 | # undef res_mkquery |
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| 328 | # undef res_query |
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| 329 | # undef res_querydomain |
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| 330 | # undef res_search |
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| 331 | weak_alias (__res_mkquery, res_mkquery); |
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| 332 | weak_alias (__res_query, res_query); |
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| 333 | weak_alias (__res_querydomain, res_querydomain); |
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| 334 | weak_alias (__res_search, res_search); |
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| 335 | #endif |
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