/* Unix SMB/CIFS implementation. WINS database routines Copyright (C) Andrew Tridgell 2005 Copyright (C) Stefan Metzmacher 2005 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #include "nbt_server/nbt_server.h" #include "nbt_server/wins/winsdb.h" #include "lib/ldb/include/ldb.h" #include "lib/ldb/include/ldb_errors.h" #include "system/time.h" #include "auth/auth.h" uint64_t winsdb_get_maxVersion(struct winsdb_handle *h) { int ret; struct ldb_context *ldb = h->ldb; struct ldb_dn *dn; struct ldb_result *res = NULL; TALLOC_CTX *tmp_ctx = talloc_new(ldb); uint64_t maxVersion = 0; dn = ldb_dn_explode(tmp_ctx, "CN=VERSION"); if (!dn) goto failed; /* find the record in the WINS database */ ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res); if (ret != LDB_SUCCESS) goto failed; talloc_steal(tmp_ctx, res); if (res->count > 1) goto failed; if (res->count == 1) { maxVersion = ldb_msg_find_uint64(res->msgs[0], "maxVersion", 0); } failed: talloc_free(tmp_ctx); return maxVersion; } /* if newVersion == 0 return the old maxVersion + 1 and save it if newVersion > 0 return MAX(oldMaxVersion, newMaxVersion) and save it */ uint64_t winsdb_set_maxVersion(struct winsdb_handle *h, uint64_t newMaxVersion) { int trans; int ret; struct ldb_dn *dn; struct ldb_result *res = NULL; struct ldb_message *msg = NULL; struct ldb_context *wins_db = h->ldb; TALLOC_CTX *tmp_ctx = talloc_new(wins_db); uint64_t oldMaxVersion = 0; trans = ldb_transaction_start(wins_db); if (trans != LDB_SUCCESS) goto failed; dn = ldb_dn_explode(tmp_ctx, "CN=VERSION"); if (!dn) goto failed; /* find the record in the WINS database */ ret = ldb_search(wins_db, dn, LDB_SCOPE_BASE, NULL, NULL, &res); if (ret != LDB_SUCCESS) goto failed; if (res->count > 1) goto failed; talloc_steal(tmp_ctx, res); if (res->count == 1) { oldMaxVersion = ldb_msg_find_uint64(res->msgs[0], "maxVersion", 0); } if (newMaxVersion == 0) { newMaxVersion = oldMaxVersion + 1; } else { newMaxVersion = MAX(oldMaxVersion, newMaxVersion); } msg = ldb_msg_new(tmp_ctx); if (!msg) goto failed; msg->dn = dn; ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE); if (ret != 0) goto failed; ret = ldb_msg_add_string(msg, "objectClass", "winsMaxVersion"); if (ret != 0) goto failed; ret = ldb_msg_add_empty(msg, "maxVersion", LDB_FLAG_MOD_REPLACE); if (ret != 0) goto failed; ret = ldb_msg_add_fmt(msg, "maxVersion", "%llu", (long long)newMaxVersion); if (ret != 0) goto failed; ret = ldb_modify(wins_db, msg); if (ret != 0) ret = ldb_add(wins_db, msg); if (ret != 0) goto failed; trans = ldb_transaction_commit(wins_db); if (trans != LDB_SUCCESS) goto failed; talloc_free(tmp_ctx); return newMaxVersion; failed: if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db); talloc_free(tmp_ctx); return 0; } uint64_t winsdb_get_seqnumber(struct winsdb_handle *h) { int ret; struct ldb_context *ldb = h->ldb; struct ldb_dn *dn; struct ldb_result *res = NULL; TALLOC_CTX *tmp_ctx = talloc_new(ldb); uint64_t seqnumber = 0; dn = ldb_dn_explode(tmp_ctx, "@BASEINFO"); if (!dn) goto failed; /* find the record in the WINS database */ ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res); if (ret != LDB_SUCCESS) goto failed; talloc_steal(tmp_ctx, res); if (res->count > 1) goto failed; if (res->count == 1) { seqnumber = ldb_msg_find_uint64(res->msgs[0], "sequenceNumber", 0); } failed: talloc_free(tmp_ctx); return seqnumber; } /* return a DN for a nbt_name */ static struct ldb_dn *winsdb_dn(TALLOC_CTX *mem_ctx, struct nbt_name *name) { struct ldb_dn *dn; dn = ldb_dn_string_compose(mem_ctx, NULL, "type=0x%02X", name->type); if (dn && name->name && *name->name) { dn = ldb_dn_string_compose(mem_ctx, dn, "name=%s", name->name); } if (dn && name->scope && *name->scope) { dn = ldb_dn_string_compose(mem_ctx, dn, "scope=%s", name->scope); } return dn; } static NTSTATUS winsdb_nbt_name(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct nbt_name **_name) { NTSTATUS status; struct nbt_name *name; uint32_t cur = 0; name = talloc(mem_ctx, struct nbt_name); if (!name) { status = NT_STATUS_NO_MEMORY; goto failed; } if (dn->comp_num > 3) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } if (dn->comp_num > cur && strcasecmp("scope", dn->components[cur].name) == 0) { name->scope = talloc_steal(name, dn->components[cur].value.data); cur++; } else { name->scope = NULL; } if (dn->comp_num > cur && strcasecmp("name", dn->components[cur].name) == 0) { name->name = talloc_steal(name, dn->components[cur].value.data); cur++; } else { name->name = talloc_strdup(name, ""); if (!name->name) { status = NT_STATUS_NO_MEMORY; goto failed; } } if (dn->comp_num > cur && strcasecmp("type", dn->components[cur].name) == 0) { name->type = strtoul((char *)dn->components[cur].value.data, NULL, 0); cur++; } else { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } *_name = name; return NT_STATUS_OK; failed: talloc_free(name); return status; } /* decode the winsdb_addr("address") attribute: "172.31.1.1" or "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;" are valid records */ static NTSTATUS winsdb_addr_decode(struct winsdb_handle *h, struct winsdb_record *rec, struct ldb_val *val, TALLOC_CTX *mem_ctx, struct winsdb_addr **_addr) { NTSTATUS status; struct winsdb_addr *addr; const char *address; const char *wins_owner; const char *expire_time; char *p; addr = talloc(mem_ctx, struct winsdb_addr); if (!addr) { status = NT_STATUS_NO_MEMORY; goto failed; } address = (char *)val->data; p = strchr(address, ';'); if (!p) { /* support old entries, with only the address */ addr->address = talloc_steal(addr, val->data); addr->wins_owner = talloc_reference(addr, rec->wins_owner); if (!addr->wins_owner) { status = NT_STATUS_NO_MEMORY; goto failed; } addr->expire_time = rec->expire_time; *_addr = addr; return NT_STATUS_OK; } *p = '\0';p++; addr->address = talloc_strdup(addr, address); if (!addr->address) { status = NT_STATUS_NO_MEMORY; goto failed; } if (strncmp("winsOwner:", p, 10) != 0) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } wins_owner = p + 10; p = strchr(wins_owner, ';'); if (!p) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } *p = '\0';p++; if (strcmp(wins_owner, "0.0.0.0") == 0) { wins_owner = h->local_owner; } addr->wins_owner = talloc_strdup(addr, wins_owner); if (!addr->wins_owner) { status = NT_STATUS_NO_MEMORY; goto failed; } if (strncmp("expireTime:", p, 11) != 0) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } expire_time = p + 11; p = strchr(expire_time, ';'); if (!p) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } *p = '\0';p++; addr->expire_time = ldb_string_to_time(expire_time); *_addr = addr; return NT_STATUS_OK; failed: talloc_free(addr); return status; } /* encode the winsdb_addr("address") attribute like this: "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;" */ static int ldb_msg_add_winsdb_addr(struct ldb_message *msg, const char *attr_name, struct winsdb_addr *addr) { struct ldb_val val; const char *str; char *expire_time; expire_time = ldb_timestring(msg, addr->expire_time); if (!expire_time) return -1; str = talloc_asprintf(msg, "%s;winsOwner:%s;expireTime:%s;", addr->address, addr->wins_owner, expire_time); talloc_free(expire_time); if (!str) return -1; val.data = discard_const_p(uint8_t, str); val.length = strlen(str); return ldb_msg_add_value(msg, attr_name, &val); } struct winsdb_addr **winsdb_addr_list_make(TALLOC_CTX *mem_ctx) { struct winsdb_addr **addresses; addresses = talloc_array(mem_ctx, struct winsdb_addr *, 1); if (!addresses) return NULL; addresses[0] = NULL; return addresses; } struct winsdb_addr **winsdb_addr_list_add(struct winsdb_addr **addresses, const char *address, const char *wins_owner, time_t expire_time) { size_t len = winsdb_addr_list_length(addresses); addresses = talloc_realloc(addresses, addresses, struct winsdb_addr *, len + 2); if (!addresses) return NULL; addresses[len] = talloc(addresses, struct winsdb_addr); if (!addresses[len]) { talloc_free(addresses); return NULL; } addresses[len]->address = talloc_strdup(addresses[len], address); if (!addresses[len]->address) { talloc_free(addresses); return NULL; } addresses[len]->wins_owner = talloc_strdup(addresses[len], wins_owner); if (!addresses[len]->wins_owner) { talloc_free(addresses); return NULL; } addresses[len]->expire_time = expire_time; addresses[len+1] = NULL; return addresses; } void winsdb_addr_list_remove(struct winsdb_addr **addresses, const char *address) { size_t i; for (i=0; addresses[i]; i++) { if (strcmp(addresses[i]->address, address) == 0) { break; } } if (!addresses[i]) return; for (; addresses[i]; i++) { addresses[i] = addresses[i+1]; } return; } struct winsdb_addr *winsdb_addr_list_check(struct winsdb_addr **addresses, const char *address) { size_t i; for (i=0; addresses[i]; i++) { if (strcmp(addresses[i]->address, address) == 0) { return addresses[i]; } } return NULL; } size_t winsdb_addr_list_length(struct winsdb_addr **addresses) { size_t i; for (i=0; addresses[i]; i++); return i; } const char **winsdb_addr_string_list(TALLOC_CTX *mem_ctx, struct winsdb_addr **addresses) { size_t len = winsdb_addr_list_length(addresses); const char **str_list=NULL; size_t i; for (i=0; i < len; i++) { str_list = str_list_add(str_list, addresses[i]->address); if (!str_list[i]) { return NULL; } } talloc_steal(mem_ctx, str_list); return str_list; } /* load a WINS entry from the database */ NTSTATUS winsdb_lookup(struct winsdb_handle *h, struct nbt_name *name, TALLOC_CTX *mem_ctx, struct winsdb_record **_rec) { NTSTATUS status; struct ldb_result *res = NULL; int ret; struct winsdb_record *rec; struct ldb_context *wins_db = h->ldb; TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx); /* find the record in the WINS database */ ret = ldb_search(wins_db, winsdb_dn(tmp_ctx, name), LDB_SCOPE_BASE, NULL, NULL, &res); if (ret != LDB_SUCCESS || res->count > 1) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } else if (res->count== 0) { status = NT_STATUS_OBJECT_NAME_NOT_FOUND; goto failed; } talloc_steal(tmp_ctx, res); status = winsdb_record(h, res->msgs[0], tmp_ctx, &rec); if (!NT_STATUS_IS_OK(status)) goto failed; /* see if it has already expired */ if (rec->state == WREPL_STATE_ACTIVE && rec->expire_time <= time(NULL)) { DEBUG(5,("WINS: expiring name %s (expired at %s)\n", nbt_name_string(tmp_ctx, rec->name), timestring(tmp_ctx, rec->expire_time))); rec->state = WREPL_STATE_RELEASED; } talloc_steal(mem_ctx, rec); talloc_free(tmp_ctx); *_rec = rec; return NT_STATUS_OK; failed: talloc_free(tmp_ctx); return status; } NTSTATUS winsdb_record(struct winsdb_handle *h, struct ldb_message *msg, TALLOC_CTX *mem_ctx, struct winsdb_record **_rec) { NTSTATUS status; struct winsdb_record *rec; struct ldb_message_element *el; struct nbt_name *name; uint32_t i, num_values; rec = talloc(mem_ctx, struct winsdb_record); if (rec == NULL) { status = NT_STATUS_NO_MEMORY; goto failed; } status = winsdb_nbt_name(rec, msg->dn, &name); if (!NT_STATUS_IS_OK(status)) goto failed; if (strlen(name->name) > 15) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } if (name->scope && strlen(name->scope) > 238) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } /* parse it into a more convenient winsdb_record structure */ rec->name = name; rec->type = ldb_msg_find_int(msg, "recordType", WREPL_TYPE_UNIQUE); rec->state = ldb_msg_find_int(msg, "recordState", WREPL_STATE_RELEASED); rec->node = ldb_msg_find_int(msg, "nodeType", WREPL_NODE_B); rec->is_static = ldb_msg_find_int(msg, "isStatic", 0); rec->expire_time = ldb_string_to_time(ldb_msg_find_string(msg, "expireTime", NULL)); rec->version = ldb_msg_find_uint64(msg, "versionID", 0); rec->wins_owner = ldb_msg_find_string(msg, "winsOwner", NULL); rec->registered_by = ldb_msg_find_string(msg, "registeredBy", NULL); talloc_steal(rec, rec->wins_owner); talloc_steal(rec, rec->registered_by); if (!rec->wins_owner || strcmp(rec->wins_owner, "0.0.0.0") == 0) { rec->wins_owner = h->local_owner; } el = ldb_msg_find_element(msg, "address"); if (el) { num_values = el->num_values; } else { num_values = 0; } if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_GROUP) { if (num_values != 1) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } } if (rec->state == WREPL_STATE_ACTIVE) { if (num_values < 1) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } } if (num_values > 25) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } rec->addresses = talloc_array(rec, struct winsdb_addr *, num_values+1); if (rec->addresses == NULL) { status = NT_STATUS_NO_MEMORY; goto failed; } for (i=0;ivalues[i], rec->addresses, &rec->addresses[i]); if (!NT_STATUS_IS_OK(status)) goto failed; } rec->addresses[i] = NULL; if (rec->is_static) { if (num_values < 1) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } rec->state = WREPL_STATE_ACTIVE; rec->expire_time = get_time_t_max(); for (i=0;rec->addresses[i];i++) { rec->addresses[i]->expire_time = rec->expire_time; } } *_rec = rec; return NT_STATUS_OK; failed: if (NT_STATUS_EQUAL(NT_STATUS_INTERNAL_DB_CORRUPTION, status)) { DEBUG(1,("winsdb_record: corrupted record: %s\n", ldb_dn_linearize(rec, msg->dn))); } talloc_free(rec); return status; } /* form a ldb_message from a winsdb_record */ struct ldb_message *winsdb_message(struct ldb_context *ldb, struct winsdb_record *rec, TALLOC_CTX *mem_ctx) { int i, ret=0; size_t addr_count; const char *expire_time; struct ldb_message *msg = ldb_msg_new(mem_ctx); if (msg == NULL) goto failed; if (rec->is_static) { rec->state = WREPL_STATE_ACTIVE; rec->expire_time = get_time_t_max(); for (i=0;rec->addresses[i];i++) { rec->addresses[i]->expire_time = rec->expire_time; } } /* make sure we don't put in corrupted records */ addr_count = winsdb_addr_list_length(rec->addresses); if (rec->state == WREPL_STATE_ACTIVE && addr_count == 0) { rec->state = WREPL_STATE_RELEASED; } if (rec->type == WREPL_TYPE_UNIQUE && addr_count > 1) { rec->type = WREPL_TYPE_MHOMED; } expire_time = ldb_timestring(msg, rec->expire_time); if (!expire_time) { goto failed; } msg->dn = winsdb_dn(msg, rec->name); if (msg->dn == NULL) goto failed; ret |= ldb_msg_add_fmt(msg, "type", "0x%02X", rec->name->type); if (rec->name->name && *rec->name->name) { ret |= ldb_msg_add_string(msg, "name", rec->name->name); } if (rec->name->scope && *rec->name->scope) { ret |= ldb_msg_add_string(msg, "scope", rec->name->scope); } ret |= ldb_msg_add_fmt(msg, "objectClass", "winsRecord"); ret |= ldb_msg_add_fmt(msg, "recordType", "%u", rec->type); ret |= ldb_msg_add_fmt(msg, "recordState", "%u", rec->state); ret |= ldb_msg_add_fmt(msg, "nodeType", "%u", rec->node); ret |= ldb_msg_add_fmt(msg, "isStatic", "%u", rec->is_static); ret |= ldb_msg_add_string(msg, "expireTime", expire_time); ret |= ldb_msg_add_fmt(msg, "versionID", "%llu", (long long)rec->version); ret |= ldb_msg_add_string(msg, "winsOwner", rec->wins_owner); ret |= ldb_msg_add_empty(msg, "address", 0); for (i=0;rec->addresses[i];i++) { ret |= ldb_msg_add_winsdb_addr(msg, "address", rec->addresses[i]); } ret |= ldb_msg_add_empty(msg, "registeredBy", 0); if (rec->registered_by) { ret |= ldb_msg_add_string(msg, "registeredBy", rec->registered_by); if (ret != 0) goto failed; } return msg; failed: talloc_free(msg); return NULL; } /* save a WINS record into the database */ uint8_t winsdb_add(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags) { struct ldb_message *msg; struct ldb_context *wins_db = h->ldb; TALLOC_CTX *tmp_ctx = talloc_new(wins_db); int trans = -1; int ret = 0; trans = ldb_transaction_start(wins_db); if (trans != LDB_SUCCESS) goto failed; if (flags & WINSDB_FLAG_ALLOC_VERSION) { /* passing '0' means auto-allocate a new one */ rec->version = winsdb_set_maxVersion(h, 0); if (rec->version == 0) goto failed; } if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) { rec->wins_owner = h->local_owner; } msg = winsdb_message(wins_db, rec, tmp_ctx); if (msg == NULL) goto failed; ret = ldb_add(wins_db, msg); if (ret != 0) goto failed; trans = ldb_transaction_commit(wins_db); if (trans != LDB_SUCCESS) goto failed; talloc_free(tmp_ctx); return NBT_RCODE_OK; failed: if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db); talloc_free(tmp_ctx); return NBT_RCODE_SVR; } /* modify a WINS record in the database */ uint8_t winsdb_modify(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags) { struct ldb_message *msg; struct ldb_context *wins_db = h->ldb; TALLOC_CTX *tmp_ctx = talloc_new(wins_db); int trans; int ret; int i; trans = ldb_transaction_start(wins_db); if (trans != LDB_SUCCESS) goto failed; if (flags & WINSDB_FLAG_ALLOC_VERSION) { /* passing '0' means auto-allocate a new one */ rec->version = winsdb_set_maxVersion(h, 0); if (rec->version == 0) goto failed; } if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) { rec->wins_owner = h->local_owner; } msg = winsdb_message(wins_db, rec, tmp_ctx); if (msg == NULL) goto failed; for (i=0;inum_elements;i++) { msg->elements[i].flags = LDB_FLAG_MOD_REPLACE; } ret = ldb_modify(wins_db, msg); if (ret != 0) goto failed; trans = ldb_transaction_commit(wins_db); if (trans != LDB_SUCCESS) goto failed; talloc_free(tmp_ctx); return NBT_RCODE_OK; failed: if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db); talloc_free(tmp_ctx); return NBT_RCODE_SVR; } /* delete a WINS record from the database */ uint8_t winsdb_delete(struct winsdb_handle *h, struct winsdb_record *rec) { struct ldb_context *wins_db = h->ldb; TALLOC_CTX *tmp_ctx = talloc_new(wins_db); const struct ldb_dn *dn; int trans; int ret; trans = ldb_transaction_start(wins_db); if (trans != LDB_SUCCESS) goto failed; dn = winsdb_dn(tmp_ctx, rec->name); if (dn == NULL) goto failed; ret = ldb_delete(wins_db, dn); if (ret != 0) goto failed; trans = ldb_transaction_commit(wins_db); if (trans != LDB_SUCCESS) goto failed; talloc_free(tmp_ctx); return NBT_RCODE_OK; failed: if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db); talloc_free(tmp_ctx); return NBT_RCODE_SVR; } struct winsdb_handle *winsdb_connect(TALLOC_CTX *mem_ctx) { struct winsdb_handle *h = NULL; const char *owner; h = talloc(mem_ctx, struct winsdb_handle); if (!h) return NULL; h->ldb = ldb_wrap_connect(h, lock_path(h, lp_wins_url()), system_session(h), NULL, 0, NULL); if (!h->ldb) goto failed; owner = lp_parm_string(-1, "winsdb", "local_owner"); if (!owner) { owner = iface_n_ip(0); } h->local_owner = talloc_strdup(h, owner); if (!h->local_owner) goto failed; return h; failed: talloc_free(h); return NULL; }