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Diffstat (limited to '')
| -rw-r--r-- | contrib/dlz/modules/common/dlz_dbi.c | 484 |
1 files changed, 484 insertions, 0 deletions
diff --git a/contrib/dlz/modules/common/dlz_dbi.c b/contrib/dlz/modules/common/dlz_dbi.c new file mode 100644 index 0000000..88ff632 --- /dev/null +++ b/contrib/dlz/modules/common/dlz_dbi.c @@ -0,0 +1,484 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 and ISC + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + */ + +/* + * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl. + * + * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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. + */ + +#include <ctype.h> +#include <errno.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <dlz_dbi.h> +#include <dlz_list.h> +#include <dlz_minimal.h> +#include <dlz_pthread.h> + +/*% + * properly destroys a querylist by de-allocating the + * memory for each query segment, and then the list itself + */ + +void +destroy_querylist(query_list_t **querylist) { + query_segment_t *tseg = NULL; + query_segment_t *nseg = NULL; + + /* if query list is null, nothing to do */ + if (*querylist == NULL) { + return; + } + + /* start at the top of the list */ + nseg = DLZ_LIST_HEAD(**querylist); + while (nseg != NULL) { /* loop, until end of list */ + tseg = nseg; + /* + * free the query segment's text string but only if it + * was really a query segment, and not a pointer to + * %zone%, or %record%, or %client% + */ + if (tseg->cmd != NULL && tseg->direct) { + free(tseg->cmd); + } + /* get the next query segment, before we destroy this one. */ + nseg = DLZ_LIST_NEXT(nseg, link); + /* deallocate this query segment. */ + free(tseg); + } + /* deallocate the query segment list */ + free(*querylist); +} + +/*% constructs a query list by parsing a string into query segments */ +isc_result_t +build_querylist(const char *query_str, char **zone, char **record, + char **client, query_list_t **querylist, unsigned int flags, + log_t log) { + isc_result_t result; + bool foundzone = false; + bool foundrecord = false; + bool foundclient = false; + char *temp_str = NULL; + char *right_str = NULL; + char *token = NULL; + query_list_t *tql; + query_segment_t *tseg = NULL; + + /* if query string is null, or zero length */ + if (query_str == NULL || strlen(query_str) < 1) { + if ((flags & REQUIRE_QUERY) == 0) { + /* we don't need it were ok. */ + return (ISC_R_SUCCESS); + } else { + /* we did need it, PROBLEM!!! */ + return (ISC_R_FAILURE); + } + } + + /* allocate memory for query list */ + tql = calloc(1, sizeof(query_list_t)); + /* couldn't allocate memory. Problem!! */ + if (tql == NULL) { + return (ISC_R_NOMEMORY); + } + + /* initialize the query segment list */ + DLZ_LIST_INIT(*tql); + + /* make a copy of query_str so we can chop it up */ + temp_str = right_str = strdup(query_str); + /* couldn't make a copy, problem!! */ + if (right_str == NULL) { + result = ISC_R_NOMEMORY; + goto cleanup; + } + + /* loop through the string and chop it up */ + for (token = strtok_r(right_str, "$", &temp_str); token; + token = strtok_r(NULL, "$", &temp_str)) + { + /* allocate memory for tseg */ + tseg = calloc(1, sizeof(query_segment_t)); + if (tseg == NULL) { /* no memory, clean everything up. */ + result = ISC_R_NOMEMORY; + goto cleanup; + } + tseg->direct = false; + /* initialize the query segment link */ + DLZ_LINK_INIT(tseg, link); + /* append the query segment to the list */ + DLZ_LIST_APPEND(*tql, tseg, link); + + /* + * split string at the first "$". set query segment to + * left portion + */ + tseg->cmd = strdup(token); + if (tseg->cmd == NULL) { + /* no memory, clean everything up. */ + result = ISC_R_NOMEMORY; + goto cleanup; + } + /* tseg->cmd points directly to a string. */ + tseg->direct = true; + tseg->strlen = strlen(tseg->cmd); + + /* check if we encountered "$zone$" token */ + if (strcasecmp(tseg->cmd, "zone") == 0) { + /* + * we don't really need, or want the "zone" + * text, so get rid of it. + */ + free(tseg->cmd); + /* set tseg->cmd to in-direct zone string */ + tseg->cmd = (char **)zone; + tseg->strlen = 0; + /* tseg->cmd points in-directly to a string */ + tseg->direct = false; + foundzone = true; + /* check if we encountered "$record$" token */ + } else if (strcasecmp(tseg->cmd, "record") == 0) { + /* + * we don't really need, or want the "record" + * text, so get rid of it. + */ + free(tseg->cmd); + /* set tseg->cmd to in-direct record string */ + tseg->cmd = (char **)record; + tseg->strlen = 0; + /* tseg->cmd points in-directly poinsts to a string */ + tseg->direct = false; + foundrecord = true; + /* check if we encountered "$client$" token */ + } else if (strcasecmp(tseg->cmd, "client") == 0) { + /* + * we don't really need, or want the "client" + * text, so get rid of it. + */ + free(tseg->cmd); + /* set tseg->cmd to in-direct record string */ + tseg->cmd = (char **)client; + tseg->strlen = 0; + /* tseg->cmd points in-directly poinsts to a string */ + tseg->direct = false; + foundclient = true; + } + } + + /* we don't need temp_str any more */ + free(right_str); + right_str = NULL; + /* + * add checks later to verify zone and record are found if + * necessary. + */ + + /* if this query requires %client%, make sure we found it */ + if (((flags & REQUIRE_CLIENT) != 0) && (!foundclient)) { + /* Write error message to log */ + if (log != NULL) { + log(ISC_LOG_ERROR, "Required token $client$ not " + "found."); + } + result = ISC_R_FAILURE; + goto flag_fail; + } + + /* if this query requires %record%, make sure we found it */ + if (((flags & REQUIRE_RECORD) != 0) && (!foundrecord)) { + /* Write error message to log */ + if (log != NULL) { + log(ISC_LOG_ERROR, "Required token $record$ not " + "found."); + } + result = ISC_R_FAILURE; + goto flag_fail; + } + + /* if this query requires %zone%, make sure we found it */ + if (((flags & REQUIRE_ZONE) != 0) && (!foundzone)) { + /* Write error message to log */ + if (log != NULL) { + log(ISC_LOG_ERROR, "Required token $zone$ not found."); + } + result = ISC_R_FAILURE; + goto flag_fail; + } + + /* pass back the query list */ + *querylist = (query_list_t *)tql; + + /* return success */ + return (ISC_R_SUCCESS); + +cleanup: + /* get rid of temp_str */ + if (right_str != NULL) { + free(right_str); + } + +flag_fail: + /* get rid of what was build of the query list */ + destroy_querylist(&tql); + return (result); +} + +/*% + * build a query string from query segments, and dynamic segments + * dynamic segments replace where the tokens %zone%, %record%, %client% + * used to be in our queries from named.conf + */ +char * +build_querystring(query_list_t *querylist) { + query_segment_t *tseg = NULL; + unsigned int length = 0; + char *qs = NULL; + + /* start at the top of the list */ + tseg = DLZ_LIST_HEAD(*querylist); + while (tseg != NULL) { + /* + * if this is a query segment, use the + * precalculated string length + */ + if (tseg->direct) { + length += tseg->strlen; + } else { /* calculate string length for dynamic segments. */ + length += strlen(*(char **)tseg->cmd); + } + /* get the next segment */ + tseg = DLZ_LIST_NEXT(tseg, link); + } + + qs = malloc(length + 1); + if (qs == NULL) { + return (NULL); + } + + *qs = '\0'; + /* start at the top of the list again */ + tseg = DLZ_LIST_HEAD(*querylist); + while (tseg != NULL) { + if (tseg->direct) { + /* query segments */ + strcat(qs, tseg->cmd); + } else { + /* dynamic segments */ + strcat(qs, *(char **)tseg->cmd); + } + /* get the next segment */ + tseg = DLZ_LIST_NEXT(tseg, link); + } + + return (qs); +} + +/*% constructs a dbinstance (DBI) */ +isc_result_t +build_dbinstance(const char *allnodes_str, const char *allowxfr_str, + const char *authority_str, const char *findzone_str, + const char *lookup_str, const char *countzone_str, + dbinstance_t **dbi, log_t log) { + isc_result_t result; + dbinstance_t *db = NULL; + int err; + + /* allocate and zero memory for driver structure */ + db = calloc(1, sizeof(dbinstance_t)); + if (db == NULL) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not allocate memory for " + "database instance object."); + } + return (ISC_R_NOMEMORY); + } + memset(db, 0, sizeof(dbinstance_t)); + db->dbconn = NULL; + db->client = NULL; + db->record = NULL; + db->zone = NULL; + db->query_buf = NULL; + db->allnodes_q = NULL; + db->allowxfr_q = NULL; + db->authority_q = NULL; + db->findzone_q = NULL; + db->countzone_q = NULL; + db->lookup_q = NULL; + + /* initialize the reference count mutex */ + err = dlz_mutex_init(&db->lock, NULL); + if (err == ENOMEM) { + result = ISC_R_NOMEMORY; + goto cleanup; + } else if (err != 0) { + result = ISC_R_UNEXPECTED; + goto cleanup; + } + + /* build the all nodes query list */ + result = build_querylist(allnodes_str, &db->zone, &db->record, + &db->client, &db->allnodes_q, REQUIRE_ZONE, + log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build all nodes query " + "list"); + } + goto cleanup; + } + + /* build the allow zone transfer query list */ + result = build_querylist(allowxfr_str, &db->zone, &db->record, + &db->client, &db->allowxfr_q, + REQUIRE_ZONE | REQUIRE_CLIENT, log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build allow xfr query " + "list"); + } + goto cleanup; + } + + /* build the authority query, query list */ + result = build_querylist(authority_str, &db->zone, &db->record, + &db->client, &db->authority_q, REQUIRE_ZONE, + log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build authority query " + "list"); + } + goto cleanup; + } + + /* build findzone query, query list */ + result = build_querylist(findzone_str, &db->zone, &db->record, + &db->client, &db->findzone_q, REQUIRE_ZONE, + log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build find zone query " + "list"); + } + goto cleanup; + } + + /* build countzone query, query list */ + result = build_querylist(countzone_str, &db->zone, &db->record, + &db->client, &db->countzone_q, REQUIRE_ZONE, + log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build count zone query " + "list"); + } + goto cleanup; + } + + /* build lookup query, query list */ + result = build_querylist(lookup_str, &db->zone, &db->record, + &db->client, &db->lookup_q, REQUIRE_RECORD, + log); + /* if unsuccessful, log err msg and cleanup */ + if (result != ISC_R_SUCCESS) { + if (log != NULL) { + log(ISC_LOG_ERROR, "Could not build lookup query list"); + } + goto cleanup; + } + + /* pass back the db instance */ + *dbi = (dbinstance_t *)db; + + /* return success */ + return (ISC_R_SUCCESS); + +cleanup: + /* destroy whatever was build of the db instance */ + destroy_dbinstance(db); + /* return failure */ + return (ISC_R_FAILURE); +} + +void +destroy_dbinstance(dbinstance_t *dbi) { + /* destroy any query lists we created */ + destroy_querylist(&dbi->allnodes_q); + destroy_querylist(&dbi->allowxfr_q); + destroy_querylist(&dbi->authority_q); + destroy_querylist(&dbi->findzone_q); + destroy_querylist(&dbi->countzone_q); + destroy_querylist(&dbi->lookup_q); + + /* get rid of the mutex */ + (void)dlz_mutex_destroy(&dbi->lock); + + /* return, and detach the memory */ + free(dbi); +} + +char * +get_parameter_value(const char *input, const char *key) { + int keylen; + char *keystart; + char value[255]; + int i; + + if (key == NULL || input == NULL || *input == '\0') { + return (NULL); + } + + keylen = strlen(key); + + if (keylen < 1) { + return (NULL); + } + + keystart = strstr(input, key); + + if (keystart == NULL) { + return (NULL); + } + + for (i = 0; i < 255; i++) { + value[i] = keystart[keylen + i]; + if (isspace(value[i]) || value[i] == '\0') { + value[i] = '\0'; + break; + } + } + + return (strdup(value)); +} |