/* * 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 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. */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $"; #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 <ctype.h> #include <netdb.h> #include <resolv.h> #ifdef BIND_UPDATE #include <res_update.h> #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> const char *_res_opcodes[] = { "QUERY", "IQUERY", "CQUERYM", "CQUERYU", /* experimental */ "NOTIFY", /* experimental */ "UPDATE", "6", "7", "8", "9", "10", "11", "12", "13", "ZONEINIT", "ZONEREF", }; libresolv_hidden_data_def (_res_opcodes) #ifdef BIND_UPDATE const char *_res_sectioncodes[] attribute_hidden = { "ZONE", "PREREQUISITES", "UPDATE", "ADDITIONAL", }; #endif #ifndef __BIND_NOSTATIC #ifdef _LIBC /* The definition has been moved to res_libc.c. */ #else #undef _res struct __res_state _res # if defined(__BIND_RES_TEXT) = { RES_TIMEOUT, } /* Motorola, et al. */ # endif ; #endif /* Proto. */ #ifndef _LIBC int res_ourserver_p(const res_state, const struct sockaddr_in *); void res_pquery(const res_state, const u_char *, int, FILE *); #endif #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); } libresolv_hidden_def (fp_query) void fp_nquery(const u_char *msg, int len, FILE *file) { if (__res_maybe_init (&_res, 0) == -1) return; res_pquery(&_res, msg, len, file); } libresolv_hidden_def (fp_nquery) 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_maybe_init (&_res, 1) == -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_maybe_init (&_res, 1) == -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_maybe_init (&_res, 1) == -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, (const struct sockaddr_in6 *) inp)); } int res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { if (__res_maybe_init (&_res, 1) == -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_maybe_init (&_res, 1) == -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) { #ifdef _LIBC /* * Some stupid programs out there call res_close() before res_init(). * Since _res._vcsock isn't explicitly initialized, these means that * we could do a close(0), which might lead to some security problems. * Therefore we check if res_init() was called before by looking at * the RES_INIT bit in _res.options. If it hasn't been set we bail out * early. */ if ((_res.options & RES_INIT) == 0) return; #endif res_nclose(&_res); } #ifdef BIND_UPDATE int res_update(ns_updrec *rrecp_in) { if (__res_maybe_init (&_res, 1) == -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_maybe_init (&_res, 1) == -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_maybe_init (&_res, 1) == -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)); } libresolv_hidden_def (hostalias) #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 #include <shlib-compat.h> #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2) # undef res_mkquery # undef res_query # undef res_querydomain # undef res_search weak_alias (__res_mkquery, res_mkquery); weak_alias (__res_query, res_query); weak_alias (__res_querydomain, res_querydomain); weak_alias (__res_search, res_search); #endif