/* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * 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. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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. */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "$Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp $"; #endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD$"); #include "port_before.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "port_after.h" const char *_res_opcodes[] = { "QUERY", "IQUERY", "CQUERYM", "CQUERYU", /* experimental */ "NOTIFY", /* experimental */ "UPDATE", "6", "7", "8", "9", "10", "11", "12", "13", "ZONEINIT", "ZONEREF", }; #ifdef BIND_UPDATE const char *_res_sectioncodes[] = { "ZONE", "PREREQUISITES", "UPDATE", "ADDITIONAL", }; #endif #ifndef __BIND_NOSTATIC /* Proto. */ int res_ourserver_p(const res_state, const struct sockaddr_in *); 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 = RES_DFLRETRY; 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)); } 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) == 0U && 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) == 0U && 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)); } int res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { if ((_res.options & RES_INIT) == 0U && res_init() == -1) { RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); return (-1); } return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); } 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) == 0U && res_init() == -1) { RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); return (-1); } return (res_nquery(&_res, name, class, type, answer, anslen)); } #ifndef _LIBC void res_send_setqhook(res_send_qhook hook) { _res.qhook = hook; } void res_send_setrhook(res_send_rhook hook) { _res.rhook = hook; } #endif 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) == 0U && 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) == 0U && 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); } int res_update(ns_updrec *rrecp_in) { if ((_res.options & RES_INIT) == 0U && res_init() == -1) { RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); return (-1); } return (res_nupdate(&_res, rrecp_in, NULL)); } 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) == 0U && 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) == 0U && res_init() == -1) { RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); return (-1); } return (res_nquerydomain(&_res, name, domain, class, type, answer, anslen)); } int res_opt(int n0, u_char *buf, int buflen, int anslen) { return (res_nopt(&_res, n0, buf, buflen, 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*/ /* * Weak aliases for applications that use certain private entry points, * and fail to include . */ #undef res_init __weak_reference(__res_init, res_init); #undef p_query __weak_reference(__p_query, p_query); #undef res_mkquery __weak_reference(__res_mkquery, res_mkquery); #undef res_query __weak_reference(__res_query, res_query); #undef res_send __weak_reference(__res_send, res_send); #undef res_close __weak_reference(__res_close, _res_close); #undef res_search __weak_reference(__res_search, res_search); #undef res_querydomain __weak_reference(__res_querydomain, res_querydomain); #endif