diff options
Diffstat (limited to 'contrib/bind9/lib/dns/dlz.c')
| -rw-r--r-- | contrib/bind9/lib/dns/dlz.c | 510 |
1 files changed, 0 insertions, 510 deletions
diff --git a/contrib/bind9/lib/dns/dlz.c b/contrib/bind9/lib/dns/dlz.c deleted file mode 100644 index ee6c03b..0000000 --- a/contrib/bind9/lib/dns/dlz.c +++ /dev/null @@ -1,510 +0,0 @@ -/* - * Portions Copyright (C) 2005 Internet Systems Consortium, Inc. ("ISC") - * Portions Copyright (C) 1999-2001 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. - */ - -/* - * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl. - * - * 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 STICHTING NLNET - * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL - * STICHTING NLNET 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. - * - * The development of Dynamically Loadable Zones (DLZ) for Bind 9 was - * conceived and contributed by Rob Butler. - * - * 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 ROB BUTLER - * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL - * ROB BUTLER 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. - */ - -/* $Id: dlz.c,v 1.2.2.2 2005/09/06 03:47:17 marka Exp $ */ - -/*! \file */ - -/*** - *** Imports - ***/ - -#include <config.h> - -#include <dns/fixedname.h> -#include <dns/log.h> -#include <dns/master.h> -#include <dns/dlz.h> - - -#include <isc/buffer.h> -#include <isc/magic.h> -#include <isc/mem.h> -#include <isc/once.h> -#include <isc/rwlock.h> -#include <isc/string.h> -#include <isc/util.h> - -/*** - *** Supported DLZ DB Implementations Registry - ***/ - -static ISC_LIST(dns_dlzimplementation_t) dlz_implementations; -static isc_rwlock_t dlz_implock; -static isc_once_t once = ISC_ONCE_INIT; - -static void -dlz_initialize(void) { - RUNTIME_CHECK(isc_rwlock_init(&dlz_implock, 0, 0) == ISC_R_SUCCESS); - ISC_LIST_INIT(dlz_implementations); -} - -/*% - * Searches the dlz_implementations list for a driver matching name. - */ -static inline dns_dlzimplementation_t * -dlz_impfind(const char *name) { - dns_dlzimplementation_t *imp; - - for (imp = ISC_LIST_HEAD(dlz_implementations); - imp != NULL; - imp = ISC_LIST_NEXT(imp, link)) - if (strcasecmp(name, imp->name) == 0) - return (imp); - return (NULL); -} - -/*** - *** Basic DLZ Methods - ***/ - -isc_result_t -dns_dlzallowzonexfr(dns_view_t *view, dns_name_t *name, - isc_sockaddr_t *clientaddr, dns_db_t **dbp) -{ - isc_result_t result; - dns_dlzallowzonexfr_t allowzonexfr; - dns_dlzdb_t *dlzdatabase; - - /* - * Performs checks to make sure data is as we expect it to be. - */ - REQUIRE(DNS_DLZ_VALID(view->dlzdatabase)); - REQUIRE(name != NULL); - REQUIRE(dbp != NULL && *dbp == NULL); - - /* ask driver if the zone is supported */ - dlzdatabase = view->dlzdatabase; - allowzonexfr = dlzdatabase->implementation->methods->allowzonexfr; - result = (*allowzonexfr)(dlzdatabase->implementation->driverarg, - dlzdatabase->dbdata, dlzdatabase->mctx, - view->rdclass, name, clientaddr, dbp); - - if (result == ISC_R_NOTIMPLEMENTED) - return (ISC_R_NOTFOUND); - return (result); -} - -isc_result_t -dns_dlzcreate(isc_mem_t *mctx, const char *dlzname, const char *drivername, - unsigned int argc, char *argv[], dns_dlzdb_t **dbp) -{ - dns_dlzimplementation_t *impinfo; - isc_result_t result; - - /* - * initialize the dlz_implementations list, this is guaranteed - * to only really happen once. - */ - RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS); - - /* - * Performs checks to make sure data is as we expect it to be. - */ - REQUIRE(dbp != NULL && *dbp == NULL); - REQUIRE(dlzname != NULL); - REQUIRE(drivername != NULL); - REQUIRE(mctx != NULL); - - /* write log message */ - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_INFO, - "Loading '%s' using driver %s", dlzname, drivername); - - /* lock the dlz_implementations list so we can search it. */ - RWLOCK(&dlz_implock, isc_rwlocktype_read); - - /* search for the driver implementation */ - impinfo = dlz_impfind(drivername); - if (impinfo == NULL) { - RWUNLOCK(&dlz_implock, isc_rwlocktype_read); - - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_ERROR, - "unsupported DLZ database driver '%s'." - " %s not loaded.", - drivername, dlzname); - - return (ISC_R_NOTFOUND); - } - - /* Allocate memory to hold the DLZ database driver */ - (*dbp) = isc_mem_get(mctx, sizeof(dns_dlzdb_t)); - if ((*dbp) == NULL) { - RWUNLOCK(&dlz_implock, isc_rwlocktype_read); - return (ISC_R_NOMEMORY); - } - - /* Make sure memory region is set to all 0's */ - memset((*dbp), 0, sizeof(dns_dlzdb_t)); - - (*dbp)->implementation = impinfo; - - /* Create a new database using implementation 'drivername'. */ - result = ((impinfo->methods->create)(mctx, dlzname, argc, argv, - impinfo->driverarg, - &(*dbp)->dbdata)); - - /* mark the DLZ driver as valid */ - if (result == ISC_R_SUCCESS) { - RWUNLOCK(&dlz_implock, isc_rwlocktype_read); - (*dbp)->magic = DNS_DLZ_MAGIC; - isc_mem_attach(mctx, &(*dbp)->mctx); - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2), - "DLZ driver loaded successfully."); - return (ISC_R_SUCCESS); - } else { - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_ERROR, - "DLZ driver failed to load."); - } - - /* impinfo->methods->create failed. */ - RWUNLOCK(&dlz_implock, isc_rwlocktype_read); - isc_mem_put(mctx, (*dbp), sizeof(dns_dlzdb_t)); - return (result); -} - -void -dns_dlzdestroy(dns_dlzdb_t **dbp) { - isc_mem_t *mctx; - dns_dlzdestroy_t destroy; - - /* Write debugging message to log */ - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2), - "Unloading DLZ driver."); - - /* - * Perform checks to make sure data is as we expect it to be. - */ - REQUIRE(dbp != NULL && DNS_DLZ_VALID(*dbp)); - - /* call the drivers destroy method */ - if ((*dbp) != NULL) { - mctx = (*dbp)->mctx; - destroy = (*dbp)->implementation->methods->destroy; - (*destroy)((*dbp)->implementation->driverarg,(*dbp)->dbdata); - /* return memory */ - isc_mem_put(mctx, (*dbp), sizeof(dns_dlzdb_t)); - isc_mem_detach(&mctx); - } - - *dbp = NULL; -} - - -isc_result_t -dns_dlzfindzone(dns_view_t *view, dns_name_t *name, unsigned int minlabels, - dns_db_t **dbp) -{ - dns_fixedname_t fname; - dns_name_t *zonename; - unsigned int namelabels; - unsigned int i; - isc_result_t result; - dns_dlzfindzone_t findzone; - dns_dlzdb_t *dlzdatabase; - - /* - * Performs checks to make sure data is as we expect it to be. - */ - REQUIRE(DNS_DLZ_VALID(view->dlzdatabase)); - REQUIRE(name != NULL); - REQUIRE(dbp != NULL && *dbp == NULL); - - /* setup a "fixed" dns name */ - dns_fixedname_init(&fname); - zonename = dns_fixedname_name(&fname); - - /* count the number of labels in the name */ - namelabels = dns_name_countlabels(name); - - /* - * loop through starting with the longest domain name and - * trying shorter names portions of the name until we find a - * match, have an error, or are below the 'minlabels' - * threshold. minlabels is 0, if the standard database didn't - * have a zone name match. Otherwise minlables is the number - * of labels in that name. We need to beat that for a - * "better" match for the DLZ database to be authoritative - * instead of the standard database. - */ - for (i = namelabels; i > minlabels && i > 1; i--) { - if (i == namelabels) { - result = dns_name_copy(name, zonename, NULL); - if (result != ISC_R_SUCCESS) - return (result); - } else - dns_name_split(name, i, NULL, zonename); - - /* ask SDLZ driver if the zone is supported */ - dlzdatabase = view->dlzdatabase; - findzone = dlzdatabase->implementation->methods->findzone; - result = (*findzone)(dlzdatabase->implementation->driverarg, - dlzdatabase->dbdata, dlzdatabase->mctx, - view->rdclass, zonename, dbp); - if (result != ISC_R_NOTFOUND) - return (result); - } - return (ISC_R_NOTFOUND); -} - -/*% - * Registers a DLZ driver. This basically just adds the dlz - * driver to the list of available drivers in the dlz_implementations list. - */ -isc_result_t -dns_dlzregister(const char *drivername, const dns_dlzmethods_t *methods, - void *driverarg, isc_mem_t *mctx, - dns_dlzimplementation_t **dlzimp) -{ - - dns_dlzimplementation_t *dlz_imp; - - /* Write debugging message to log */ - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2), - "Registering DLZ driver '%s'", drivername); - - /* - * Performs checks to make sure data is as we expect it to be. - */ - REQUIRE(drivername != NULL); - REQUIRE(methods != NULL); - REQUIRE(methods->create != NULL); - REQUIRE(methods->destroy != NULL); - REQUIRE(methods->findzone != NULL); - REQUIRE(mctx != NULL); - REQUIRE(dlzimp != NULL && *dlzimp == NULL); - - /* - * initialize the dlz_implementations list, this is guaranteed - * to only really happen once. - */ - RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS); - - /* lock the dlz_implementations list so we can modify it. */ - RWLOCK(&dlz_implock, isc_rwlocktype_write); - - /* - * check that another already registered driver isn't using - * the same name - */ - dlz_imp = dlz_impfind(drivername); - if (dlz_imp != NULL) { - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2), - "DLZ Driver '%s' already registered", - drivername); - RWUNLOCK(&dlz_implock, isc_rwlocktype_write); - return (ISC_R_EXISTS); - } - - /* - * Allocate memory for a dlz_implementation object. Error if - * we cannot. - */ - dlz_imp = isc_mem_get(mctx, sizeof(dns_dlzimplementation_t)); - if (dlz_imp == NULL) { - RWUNLOCK(&dlz_implock, isc_rwlocktype_write); - return (ISC_R_NOMEMORY); - } - - /* Make sure memory region is set to all 0's */ - memset(dlz_imp, 0, sizeof(dns_dlzimplementation_t)); - - /* Store the data passed into this method */ - dlz_imp->name = drivername; - dlz_imp->methods = methods; - dlz_imp->mctx = NULL; - dlz_imp->driverarg = driverarg; - - /* attach the new dlz_implementation object to a memory context */ - isc_mem_attach(mctx, &dlz_imp->mctx); - - /* - * prepare the dlz_implementation object to be put in a list, - * and append it to the list - */ - ISC_LINK_INIT(dlz_imp, link); - ISC_LIST_APPEND(dlz_implementations, dlz_imp, link); - - /* Unlock the dlz_implementations list. */ - RWUNLOCK(&dlz_implock, isc_rwlocktype_write); - - /* Pass back the dlz_implementation that we created. */ - *dlzimp = dlz_imp; - - return (ISC_R_SUCCESS); -} - -/*% - * Helper function for dns_dlzstrtoargv(). - * Pardon the gratuitous recursion. - */ -static isc_result_t -dns_dlzstrtoargvsub(isc_mem_t *mctx, char *s, unsigned int *argcp, - char ***argvp, unsigned int n) -{ - isc_result_t result; - - restart: - /* Discard leading whitespace. */ - while (*s == ' ' || *s == '\t') - s++; - - if (*s == '\0') { - /* We have reached the end of the string. */ - *argcp = n; - *argvp = isc_mem_get(mctx, n * sizeof(char *)); - if (*argvp == NULL) - return (ISC_R_NOMEMORY); - } else { - char *p = s; - while (*p != ' ' && *p != '\t' && *p != '\0' && *p != '{') { - if (*p == '\n') { - *p = ' '; - goto restart; - } - p++; - } - - /* do "grouping", items between { and } are one arg */ - if (*p == '{') { - char *t = p; - /* - * shift all characters to left by 1 to get rid of '{' - */ - while (*t != '\0') { - t++; - *(t-1) = *t; - } - while (*p != '\0' && *p != '}') { - p++; - } - /* get rid of '}' character */ - if (*p == '}') { - *p = '\0'; - p++; - } - /* normal case, no "grouping" */ - } else if (*p != '\0') - *p++ = '\0'; - - result = dns_dlzstrtoargvsub(mctx, p, argcp, argvp, n + 1); - if (result != ISC_R_SUCCESS) - return (result); - (*argvp)[n] = s; - } - return (ISC_R_SUCCESS); -} - -/*% - * Tokenize the string "s" into whitespace-separated words, - * return the number of words in '*argcp' and an array - * of pointers to the words in '*argvp'. The caller - * must free the array using isc_mem_put(). The string - * is modified in-place. - */ -isc_result_t -dns_dlzstrtoargv(isc_mem_t *mctx, char *s, - unsigned int *argcp, char ***argvp) -{ - return(dns_dlzstrtoargvsub(mctx, s, argcp, argvp, 0)); -} - -/*% - * Unregisters a DLZ driver. This basically just removes the dlz - * driver from the list of available drivers in the dlz_implementations list. - */ -void -dns_dlzunregister(dns_dlzimplementation_t **dlzimp) { - dns_dlzimplementation_t *dlz_imp; - isc_mem_t *mctx; - - /* Write debugging message to log */ - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2), - "Unregistering DLZ driver."); - - /* - * Performs checks to make sure data is as we expect it to be. - */ - REQUIRE(dlzimp != NULL && *dlzimp != NULL); - - /* - * initialize the dlz_implementations list, this is guaranteed - * to only really happen once. - */ - RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS); - - dlz_imp = *dlzimp; - - /* lock the dlz_implementations list so we can modify it. */ - RWLOCK(&dlz_implock, isc_rwlocktype_write); - - /* remove the dlz_implementation object from the list */ - ISC_LIST_UNLINK(dlz_implementations, dlz_imp, link); - mctx = dlz_imp->mctx; - - /* - * return the memory back to the available memory pool and - * remove it from the memory context. - */ - isc_mem_put(mctx, dlz_imp, sizeof(dns_dlzimplementation_t)); - isc_mem_detach(&mctx); - - /* Unlock the dlz_implementations list. */ - RWUNLOCK(&dlz_implock, isc_rwlocktype_write); -} |
