diff options
Diffstat (limited to 'resolv/res_data.c')
| -rw-r--r-- | resolv/res_data.c | 335 |
1 files changed, 264 insertions, 71 deletions
diff --git a/resolv/res_data.c b/resolv/res_data.c index aa3ecbd..a9f5a2a 100644 --- a/resolv/res_data.c +++ b/resolv/res_data.c @@ -1,76 +1,42 @@ /* - * ++Copyright++ 1995 - * - - * Copyright (c) 1995 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - - * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * Copyright (c) 1995-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies, and that - * the name of Digital Equipment Corporation not be used in advertising or - * publicity pertaining to distribution of the document or software without - * specific, written prior permission. + * copyright notice and this permission notice appear in all copies. * - * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL - * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT - * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. - * - - * --Copyright-- */ #if defined(LIBC_SCCS) && !defined(lint) -static char rcsid[] = "$Id$"; +static const char rcsid[] = "$Id$"; #endif /* LIBC_SCCS and not lint */ #include <sys/types.h> #include <sys/param.h> #include <sys/socket.h> #include <sys/time.h> + #include <netinet/in.h> #include <arpa/inet.h> #include <arpa/nameser.h> -#include <stdio.h> #include <ctype.h> +#include <netdb.h> #include <resolv.h> -#if defined(BSD) && (BSD >= 199103) -# include <unistd.h> -# include <stdlib.h> -# include <string.h> -#else -# include "../conf/portability.h" -#endif +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#undef _res const char *_res_opcodes[] = { "QUERY", @@ -78,26 +44,7 @@ const char *_res_opcodes[] = { "CQUERYM", "CQUERYU", /* experimental */ "NOTIFY", /* experimental */ - "5", - "6", - "7", - "8", - "UPDATEA", - "UPDATED", - "UPDATEDA", - "UPDATEM", - "UPDATEMA", - "ZONEINIT", - "ZONEREF", -}; - -const char *_res_resultcodes[] = { - "NOERROR", - "FORMERR", - "SERVFAIL", - "NXDOMAIN", - "NOTIMP", - "REFUSED", + "UPDATE", "6", "7", "8", @@ -106,6 +53,252 @@ const char *_res_resultcodes[] = { "11", "12", "13", - "14", - "NOCHANGE", + "ZONEINIT", + "ZONEREF", +}; + +#ifdef BIND_UPDATE +const char *_res_sectioncodes[] = { + "ZONE", + "PREREQUISITES", + "UPDATE", + "ADDITIONAL", }; +#endif + +#ifndef __BIND_NOSTATIC + +#ifdef _LIBC +extern struct __res_state _res; +#else +/* The declaration has been moved to res_libc.c. */ +struct __res_state _res +# if defined(__BIND_RES_TEXT) + = { RES_TIMEOUT, } /* Motorola, et al. */ +# endif + ; +#endif + +/* Proto. */ + +int res_ourserver_p(const res_state, const struct sockaddr_in *); +void res_pquery(const res_state, const u_char *, int, FILE *); + +#ifndef _LIBC +/* Moved to res_libc.c since res_init should go into libc.so but the + rest of this file not. */ +int +res_init(void) { + extern int __res_vinit(res_state, int); + + /* + * These three fields used to be statically initialized. This made + * it hard to use this code in a shared library. It is necessary, + * now that we're doing dynamic initialization here, that we preserve + * the old semantics: if an application modifies one of these three + * fields of _res before res_init() is called, res_init() will not + * alter them. Of course, if an application is setting them to + * _zero_ before calling res_init(), hoping to override what used + * to be the static default, we can't detect it and unexpected results + * will follow. Zero for any of these fields would make no sense, + * so one can safely assume that the applications were already getting + * unexpected results. + * + * _res.options is tricky since some apps were known to diddle the bits + * before res_init() was first called. We can't replicate that semantic + * with dynamic initialization (they may have turned bits off that are + * set in RES_DEFAULT). Our solution is to declare such applications + * "broken". They could fool us by setting RES_INIT but none do (yet). + */ + if (!_res.retrans) + _res.retrans = RES_TIMEOUT; + if (!_res.retry) + _res.retry = 4; + if (!(_res.options & RES_INIT)) + _res.options = RES_DEFAULT; + + /* + * This one used to initialize implicitly to zero, so unless the app + * has set it to something in particular, we can randomize it now. + */ + if (!_res.id) + _res.id = res_randomid(); + + return (__res_vinit(&_res, 1)); +} +#endif + +void +p_query(const u_char *msg) { + fp_query(msg, stdout); +} + +void +fp_query(const u_char *msg, FILE *file) { + fp_nquery(msg, PACKETSZ, file); +} + +void +fp_nquery(const u_char *msg, int len, FILE *file) { + if ((_res.options & RES_INIT) == 0 && res_init() == -1) + return; + + res_pquery(&_res, msg, len, file); +} + +int +res_mkquery(int op, /* opcode of query */ + const char *dname, /* domain name */ + int class, int type, /* class and type of query */ + const u_char *data, /* resource record data */ + int datalen, /* length of data */ + const u_char *newrr_in, /* new rr for modify or append */ + u_char *buf, /* buffer to put query */ + int buflen) /* size of buffer */ +{ + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + return (res_nmkquery(&_res, op, dname, class, type, + data, datalen, + newrr_in, buf, buflen)); +} + +#ifdef BIND_UPDATE +int +res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + + return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); +} +#endif + +int +res_query(const char *name, /* domain name */ + int class, int type, /* class and type of query */ + u_char *answer, /* buffer to put answer */ + int anslen) /* size of answer buffer */ +{ + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + return (res_nquery(&_res, name, class, type, answer, anslen)); +} + +void +res_send_setqhook(res_send_qhook hook) { + _res.qhook = hook; +} + +void +res_send_setrhook(res_send_rhook hook) { + _res.rhook = hook; +} + +int +res_isourserver(const struct sockaddr_in *inp) { + return (res_ourserver_p(&_res, inp)); +} + +int +res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + /* errno should have been set by res_init() in this case. */ + return (-1); + } + + return (res_nsend(&_res, buf, buflen, ans, anssiz)); +} + +#ifndef _LIBC +int +res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, + u_char *ans, int anssiz) +{ + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + /* errno should have been set by res_init() in this case. */ + return (-1); + } + + return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); +} +#endif + +void +res_close(void) { + res_nclose(&_res); +} + +#ifdef BIND_UPDATE +int +res_update(ns_updrec *rrecp_in) { + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + + return (res_nupdate(&_res, rrecp_in, NULL)); +} +#endif + +int +res_search(const char *name, /* domain name */ + int class, int type, /* class and type of query */ + u_char *answer, /* buffer to put answer */ + int anslen) /* size of answer */ +{ + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + + return (res_nsearch(&_res, name, class, type, answer, anslen)); +} + +int +res_querydomain(const char *name, + const char *domain, + int class, int type, /* class and type of query */ + u_char *answer, /* buffer to put answer */ + int anslen) /* size of answer */ +{ + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); + return (-1); + } + + return (res_nquerydomain(&_res, name, domain, + class, type, + answer, anslen)); +} + +const char * +hostalias(const char *name) { + static char abuf[MAXDNAME]; + + return (res_hostalias(&_res, name, abuf, sizeof abuf)); +} + +#ifdef ultrix +int +local_hostname_length(const char *hostname) { + int len_host, len_domain; + + if (!*_res.defdname) + res_init(); + len_host = strlen(hostname); + len_domain = strlen(_res.defdname); + if (len_host > len_domain && + !strcasecmp(hostname + len_host - len_domain, _res.defdname) && + hostname[len_host - len_domain - 1] == '.') + return (len_host - len_domain - 1); + return (0); +} +#endif /*ultrix*/ + +#endif |