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Diffstat (limited to 'source/winbindd/winbindd_dual.c')
| -rw-r--r-- | source/winbindd/winbindd_dual.c | 1130 |
1 files changed, 1130 insertions, 0 deletions
diff --git a/source/winbindd/winbindd_dual.c b/source/winbindd/winbindd_dual.c new file mode 100644 index 00000000000..d9a42c31dc1 --- /dev/null +++ b/source/winbindd/winbindd_dual.c @@ -0,0 +1,1130 @@ +/* + Unix SMB/CIFS implementation. + + Winbind child daemons + + Copyright (C) Andrew Tridgell 2002 + Copyright (C) Volker Lendecke 2004,2005 + + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +/* + * We fork a child per domain to be able to act non-blocking in the main + * winbind daemon. A domain controller thousands of miles away being being + * slow replying with a 10.000 user list should not hold up netlogon calls + * that can be handled locally. + */ + +#include "includes.h" +#include "winbindd.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_WINBIND + +extern BOOL override_logfile; + +/* Read some data from a client connection */ + +static void child_read_request(struct winbindd_cli_state *state) +{ + ssize_t len; + + /* Read data */ + + len = read_data(state->sock, (char *)&state->request, + sizeof(state->request)); + + if (len != sizeof(state->request)) { + DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len)); + state->finished = True; + return; + } + + if (state->request.extra_len == 0) { + state->request.extra_data.data = NULL; + return; + } + + DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len)); + + state->request.extra_data.data = + SMB_MALLOC_ARRAY(char, state->request.extra_len + 1); + + if (state->request.extra_data.data == NULL) { + DEBUG(0, ("malloc failed\n")); + state->finished = True; + return; + } + + /* Ensure null termination */ + state->request.extra_data.data[state->request.extra_len] = '\0'; + + len = read_data(state->sock, state->request.extra_data.data, + state->request.extra_len); + + if (len != state->request.extra_len) { + DEBUG(0, ("Could not read extra data\n")); + state->finished = True; + return; + } +} + +/* + * Machinery for async requests sent to children. You set up a + * winbindd_request, select a child to query, and issue a async_request + * call. When the request is completed, the callback function you specified is + * called back with the private pointer you gave to async_request. + */ + +struct winbindd_async_request { + struct winbindd_async_request *next, *prev; + TALLOC_CTX *mem_ctx; + struct winbindd_child *child; + struct winbindd_request *request; + struct winbindd_response *response; + void (*continuation)(void *private_data, BOOL success); + struct timed_event *reply_timeout_event; + pid_t child_pid; /* pid of the child we're waiting on. Used to detect + a restart of the child (child->pid != child_pid). */ + void *private_data; +}; + +static void async_main_request_sent(void *private_data, BOOL success); +static void async_request_sent(void *private_data, BOOL success); +static void async_reply_recv(void *private_data, BOOL success); +static void schedule_async_request(struct winbindd_child *child); + +void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child, + struct winbindd_request *request, + struct winbindd_response *response, + void (*continuation)(void *private_data, BOOL success), + void *private_data) +{ + struct winbindd_async_request *state; + + SMB_ASSERT(continuation != NULL); + + state = TALLOC_P(mem_ctx, struct winbindd_async_request); + + if (state == NULL) { + DEBUG(0, ("talloc failed\n")); + continuation(private_data, False); + return; + } + + state->mem_ctx = mem_ctx; + state->child = child; + state->request = request; + state->response = response; + state->continuation = continuation; + state->private_data = private_data; + + DLIST_ADD_END(child->requests, state, struct winbindd_async_request *); + + schedule_async_request(child); + + return; +} + +static void async_main_request_sent(void *private_data, BOOL success) +{ + struct winbindd_async_request *state = + talloc_get_type_abort(private_data, struct winbindd_async_request); + + if (!success) { + DEBUG(5, ("Could not send async request\n")); + + state->response->length = sizeof(struct winbindd_response); + state->response->result = WINBINDD_ERROR; + state->continuation(state->private_data, False); + return; + } + + if (state->request->extra_len == 0) { + async_request_sent(private_data, True); + return; + } + + setup_async_write(&state->child->event, state->request->extra_data.data, + state->request->extra_len, + async_request_sent, state); +} + +/**************************************************************** + Handler triggered if the child winbindd doesn't respond within + a given timeout. +****************************************************************/ + +static void async_request_timeout_handler(struct event_context *ctx, + struct timed_event *te, + const struct timeval *now, + void *private_data) +{ + struct winbindd_async_request *state = + talloc_get_type_abort(private_data, struct winbindd_async_request); + + DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. " + "Closing connection to it.\n", + state->child_pid )); + + /* Deal with the reply - set to error. */ + async_reply_recv(private_data, False); +} + +/************************************************************** + Common function called on both async send and recv fail. + Cleans up the child and schedules the next request. +**************************************************************/ + +static void async_request_fail(struct winbindd_async_request *state) +{ + DLIST_REMOVE(state->child->requests, state); + + TALLOC_FREE(state->reply_timeout_event); + + SMB_ASSERT(state->child_pid != (pid_t)0); + + /* If not already reaped, send kill signal to child. */ + if (state->child->pid == state->child_pid) { + kill(state->child_pid, SIGTERM); + + /* + * Close the socket to the child. + */ + winbind_child_died(state->child_pid); + } + + state->response->length = sizeof(struct winbindd_response); + state->response->result = WINBINDD_ERROR; + state->continuation(state->private_data, False); +} + +static void async_request_sent(void *private_data_data, BOOL success) +{ + struct winbindd_async_request *state = + talloc_get_type_abort(private_data_data, struct winbindd_async_request); + + if (!success) { + DEBUG(5, ("Could not send async request to child pid %u\n", + (unsigned int)state->child_pid )); + async_request_fail(state); + return; + } + + /* Request successfully sent to the child, setup the wait for reply */ + + setup_async_read(&state->child->event, + &state->response->result, + sizeof(state->response->result), + async_reply_recv, state); + + /* + * Set up a timeout of 300 seconds for the response. + * If we don't get it close the child socket and + * report failure. + */ + + state->reply_timeout_event = event_add_timed(winbind_event_context(), + NULL, + timeval_current_ofs(300,0), + "async_request_timeout", + async_request_timeout_handler, + state); + if (!state->reply_timeout_event) { + smb_panic("async_request_sent: failed to add timeout handler.\n"); + } +} + +static void async_reply_recv(void *private_data, BOOL success) +{ + struct winbindd_async_request *state = + talloc_get_type_abort(private_data, struct winbindd_async_request); + struct winbindd_child *child = state->child; + + TALLOC_FREE(state->reply_timeout_event); + + state->response->length = sizeof(struct winbindd_response); + + if (!success) { + DEBUG(5, ("Could not receive async reply from child pid %u\n", + (unsigned int)state->child_pid )); + + cache_cleanup_response(state->child_pid); + async_request_fail(state); + return; + } + + SMB_ASSERT(cache_retrieve_response(state->child_pid, + state->response)); + + cache_cleanup_response(state->child_pid); + + DLIST_REMOVE(child->requests, state); + + schedule_async_request(child); + + state->continuation(state->private_data, True); +} + +static BOOL fork_domain_child(struct winbindd_child *child); + +static void schedule_async_request(struct winbindd_child *child) +{ + struct winbindd_async_request *request = child->requests; + + if (request == NULL) { + return; + } + + if (child->event.flags != 0) { + return; /* Busy */ + } + + if ((child->pid == 0) && (!fork_domain_child(child))) { + /* Cancel all outstanding requests */ + + while (request != NULL) { + /* request might be free'd in the continuation */ + struct winbindd_async_request *next = request->next; + request->continuation(request->private_data, False); + request = next; + } + return; + } + + /* Now we know who we're sending to - remember the pid. */ + request->child_pid = child->pid; + + setup_async_write(&child->event, request->request, + sizeof(*request->request), + async_main_request_sent, request); + + return; +} + +struct domain_request_state { + TALLOC_CTX *mem_ctx; + struct winbindd_domain *domain; + struct winbindd_request *request; + struct winbindd_response *response; + void (*continuation)(void *private_data_data, BOOL success); + void *private_data_data; +}; + +static void domain_init_recv(void *private_data_data, BOOL success); + +void async_domain_request(TALLOC_CTX *mem_ctx, + struct winbindd_domain *domain, + struct winbindd_request *request, + struct winbindd_response *response, + void (*continuation)(void *private_data_data, BOOL success), + void *private_data_data) +{ + struct domain_request_state *state; + + if (domain->initialized) { + async_request(mem_ctx, &domain->child, request, response, + continuation, private_data_data); + return; + } + + state = TALLOC_P(mem_ctx, struct domain_request_state); + if (state == NULL) { + DEBUG(0, ("talloc failed\n")); + continuation(private_data_data, False); + return; + } + + state->mem_ctx = mem_ctx; + state->domain = domain; + state->request = request; + state->response = response; + state->continuation = continuation; + state->private_data_data = private_data_data; + + init_child_connection(domain, domain_init_recv, state); +} + +static void domain_init_recv(void *private_data_data, BOOL success) +{ + struct domain_request_state *state = + talloc_get_type_abort(private_data_data, struct domain_request_state); + + if (!success) { + DEBUG(5, ("Domain init returned an error\n")); + state->continuation(state->private_data_data, False); + return; + } + + async_request(state->mem_ctx, &state->domain->child, + state->request, state->response, + state->continuation, state->private_data_data); +} + +static void recvfrom_child(void *private_data_data, BOOL success) +{ + struct winbindd_cli_state *state = + talloc_get_type_abort(private_data_data, struct winbindd_cli_state); + enum winbindd_result result = state->response.result; + + /* This is an optimization: The child has written directly to the + * response buffer. The request itself is still in pending state, + * state that in the result code. */ + + state->response.result = WINBINDD_PENDING; + + if ((!success) || (result != WINBINDD_OK)) { + request_error(state); + return; + } + + request_ok(state); +} + +void sendto_child(struct winbindd_cli_state *state, + struct winbindd_child *child) +{ + async_request(state->mem_ctx, child, &state->request, + &state->response, recvfrom_child, state); +} + +void sendto_domain(struct winbindd_cli_state *state, + struct winbindd_domain *domain) +{ + async_domain_request(state->mem_ctx, domain, + &state->request, &state->response, + recvfrom_child, state); +} + + +struct winbindd_child_dispatch_table { + enum winbindd_cmd cmd; + enum winbindd_result (*fn)(struct winbindd_domain *domain, + struct winbindd_cli_state *state); + const char *winbindd_cmd_name; +}; + +static struct winbindd_child_dispatch_table child_dispatch_table[] = { + + { WINBINDD_LOOKUPSID, winbindd_dual_lookupsid, "LOOKUPSID" }, + { WINBINDD_LOOKUPNAME, winbindd_dual_lookupname, "LOOKUPNAME" }, + { WINBINDD_LOOKUPRIDS, winbindd_dual_lookuprids, "LOOKUPRIDS" }, + { WINBINDD_LIST_TRUSTDOM, winbindd_dual_list_trusted_domains, "LIST_TRUSTDOM" }, + { WINBINDD_INIT_CONNECTION, winbindd_dual_init_connection, "INIT_CONNECTION" }, + { WINBINDD_GETDCNAME, winbindd_dual_getdcname, "GETDCNAME" }, + { WINBINDD_DSGETDCNAME, winbindd_dual_dsgetdcname, "DSGETDCNAME" }, + { WINBINDD_SHOW_SEQUENCE, winbindd_dual_show_sequence, "SHOW_SEQUENCE" }, + { WINBINDD_PAM_AUTH, winbindd_dual_pam_auth, "PAM_AUTH" }, + { WINBINDD_PAM_AUTH_CRAP, winbindd_dual_pam_auth_crap, "AUTH_CRAP" }, + { WINBINDD_PAM_LOGOFF, winbindd_dual_pam_logoff, "PAM_LOGOFF" }, + { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" }, + { WINBINDD_PAM_CHAUTHTOK, winbindd_dual_pam_chauthtok, "PAM_CHAUTHTOK" }, + { WINBINDD_CHECK_MACHACC, winbindd_dual_check_machine_acct, "CHECK_MACHACC" }, + { WINBINDD_DUAL_SID2UID, winbindd_dual_sid2uid, "DUAL_SID2UID" }, + { WINBINDD_DUAL_SID2GID, winbindd_dual_sid2gid, "DUAL_SID2GID" }, +#if 0 /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */ + { WINBINDD_DUAL_SIDS2XIDS, winbindd_dual_sids2xids, "DUAL_SIDS2XIDS" }, +#endif /* end DISABLED */ + { WINBINDD_DUAL_UID2SID, winbindd_dual_uid2sid, "DUAL_UID2SID" }, + { WINBINDD_DUAL_GID2SID, winbindd_dual_gid2sid, "DUAL_GID2SID" }, + { WINBINDD_DUAL_UID2NAME, winbindd_dual_uid2name, "DUAL_UID2NAME" }, + { WINBINDD_DUAL_NAME2UID, winbindd_dual_name2uid, "DUAL_NAME2UID" }, + { WINBINDD_DUAL_GID2NAME, winbindd_dual_gid2name, "DUAL_GID2NAME" }, + { WINBINDD_DUAL_NAME2GID, winbindd_dual_name2gid, "DUAL_NAME2GID" }, + { WINBINDD_DUAL_SET_MAPPING, winbindd_dual_set_mapping, "DUAL_SET_MAPPING" }, + { WINBINDD_DUAL_SET_HWM, winbindd_dual_set_hwm, "DUAL_SET_HWMS" }, + { WINBINDD_DUAL_DUMP_MAPS, winbindd_dual_dump_maps, "DUAL_DUMP_MAPS" }, + { WINBINDD_DUAL_USERINFO, winbindd_dual_userinfo, "DUAL_USERINFO" }, + { WINBINDD_ALLOCATE_UID, winbindd_dual_allocate_uid, "ALLOCATE_UID" }, + { WINBINDD_ALLOCATE_GID, winbindd_dual_allocate_gid, "ALLOCATE_GID" }, + { WINBINDD_GETUSERDOMGROUPS, winbindd_dual_getuserdomgroups, "GETUSERDOMGROUPS" }, + { WINBINDD_DUAL_GETSIDALIASES, winbindd_dual_getsidaliases, "GETSIDALIASES" }, + { WINBINDD_CCACHE_NTLMAUTH, winbindd_dual_ccache_ntlm_auth, "CCACHE_NTLM_AUTH" }, + /* End of list */ + + { WINBINDD_NUM_CMDS, NULL, "NONE" } +}; + +static void child_process_request(struct winbindd_domain *domain, + struct winbindd_cli_state *state) +{ + struct winbindd_child_dispatch_table *table; + + /* Free response data - we may be interrupted and receive another + command before being able to send this data off. */ + + state->response.result = WINBINDD_ERROR; + state->response.length = sizeof(struct winbindd_response); + + /* as all requests in the child are sync, we can use talloc_tos() */ + state->mem_ctx = talloc_tos(); + + /* Process command */ + + for (table = child_dispatch_table; table->fn; table++) { + if (state->request.cmd == table->cmd) { + DEBUG(10,("process_request: request fn %s\n", + table->winbindd_cmd_name )); + state->response.result = table->fn(domain, state); + break; + } + } + + if (!table->fn) { + DEBUG(10,("process_request: unknown request fn number %d\n", + (int)state->request.cmd )); + state->response.result = WINBINDD_ERROR; + } +} + +void setup_domain_child(struct winbindd_domain *domain, + struct winbindd_child *child, + const char *explicit_logfile) +{ + if (explicit_logfile != NULL) { + pstr_sprintf(child->logfilename, "%s/log.winbindd-%s", + dyn_LOGFILEBASE, explicit_logfile); + } else if (domain != NULL) { + pstr_sprintf(child->logfilename, "%s/log.wb-%s", + dyn_LOGFILEBASE, domain->name); + } else { + smb_panic("Internal error: domain == NULL && " + "explicit_logfile == NULL"); + } + + child->domain = domain; +} + +struct winbindd_child *children = NULL; + +void winbind_child_died(pid_t pid) +{ + struct winbindd_child *child; + + for (child = children; child != NULL; child = child->next) { + if (child->pid == pid) { + break; + } + } + + if (child == NULL) { + DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid)); + return; + } + + remove_fd_event(&child->event); + close(child->event.fd); + child->event.fd = 0; + child->event.flags = 0; + child->pid = 0; + + schedule_async_request(child); +} + +/* Ensure any negative cache entries with the netbios or realm names are removed. */ + +void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain) +{ + flush_negative_conn_cache_for_domain(domain->name); + if (*domain->alt_name) { + flush_negative_conn_cache_for_domain(domain->alt_name); + } +} + +/* Set our domains as offline and forward the offline message to our children. */ + +void winbind_msg_offline(struct messaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_child *child; + struct winbindd_domain *domain; + + DEBUG(10,("winbind_msg_offline: got offline message.\n")); + + if (!lp_winbind_offline_logon()) { + DEBUG(10,("winbind_msg_offline: rejecting offline message.\n")); + return; + } + + /* Set our global state as offline. */ + if (!set_global_winbindd_state_offline()) { + DEBUG(10,("winbind_msg_offline: offline request failed.\n")); + return; + } + + /* Set all our domains as offline. */ + for (domain = domain_list(); domain; domain = domain->next) { + if (domain->internal) { + continue; + } + DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name)); + set_domain_offline(domain); + } + + for (child = children; child != NULL; child = child->next) { + /* Don't send message to internal childs. We've already + done so above. */ + if (!child->domain || winbindd_internal_child(child)) { + continue; + } + + /* Or internal domains (this should not be possible....) */ + if (child->domain->internal) { + continue; + } + + /* Each winbindd child should only process requests for one domain - make sure + we only set it online / offline for that domain. */ + + DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n", + (unsigned int)child->pid, domain->name )); + + messaging_send_buf(msg_ctx, pid_to_procid(child->pid), + MSG_WINBIND_OFFLINE, + (uint8 *)child->domain->name, + strlen(child->domain->name)+1); + } +} + +/* Set our domains as online and forward the online message to our children. */ + +void winbind_msg_online(struct messaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_child *child; + struct winbindd_domain *domain; + + DEBUG(10,("winbind_msg_online: got online message.\n")); + + if (!lp_winbind_offline_logon()) { + DEBUG(10,("winbind_msg_online: rejecting online message.\n")); + return; + } + + /* Set our global state as online. */ + set_global_winbindd_state_online(); + + smb_nscd_flush_user_cache(); + smb_nscd_flush_group_cache(); + + /* Set all our domains as online. */ + for (domain = domain_list(); domain; domain = domain->next) { + if (domain->internal) { + continue; + } + DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name)); + + winbindd_flush_negative_conn_cache(domain); + set_domain_online_request(domain); + + /* Send an online message to the idmap child when our + primary domain comes back online */ + + if ( domain->primary ) { + struct winbindd_child *idmap = idmap_child(); + + if ( idmap->pid != 0 ) { + messaging_send_buf(msg_ctx, + pid_to_procid(idmap->pid), + MSG_WINBIND_ONLINE, + (uint8 *)domain->name, + strlen(domain->name)+1); + } + + } + } + + for (child = children; child != NULL; child = child->next) { + /* Don't send message to internal childs. */ + if (!child->domain || winbindd_internal_child(child)) { + continue; + } + + /* Or internal domains (this should not be possible....) */ + if (child->domain->internal) { + continue; + } + + /* Each winbindd child should only process requests for one domain - make sure + we only set it online / offline for that domain. */ + + DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n", + (unsigned int)child->pid, child->domain->name )); + + messaging_send_buf(msg_ctx, pid_to_procid(child->pid), + MSG_WINBIND_ONLINE, + (uint8 *)child->domain->name, + strlen(child->domain->name)+1); + } +} + +/* Forward the online/offline messages to our children. */ +void winbind_msg_onlinestatus(struct messaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_child *child; + + DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n")); + + for (child = children; child != NULL; child = child->next) { + if (child->domain && child->domain->primary) { + DEBUG(10,("winbind_msg_onlinestatus: " + "sending message to pid %u of primary domain.\n", + (unsigned int)child->pid)); + messaging_send_buf(msg_ctx, pid_to_procid(child->pid), + MSG_WINBIND_ONLINESTATUS, + (uint8 *)data->data, + data->length); + break; + } + } +} + +void winbind_msg_dump_event_list(struct messaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_child *child; + + DEBUG(10,("winbind_msg_dump_event_list received\n")); + + dump_event_list(winbind_event_context()); + + for (child = children; child != NULL; child = child->next) { + + DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n", + (unsigned int)child->pid)); + + messaging_send_buf(msg_ctx, pid_to_procid(child->pid), + MSG_DUMP_EVENT_LIST, + NULL, 0); + } + +} + +static void account_lockout_policy_handler(struct event_context *ctx, + struct timed_event *te, + const struct timeval *now, + void *private_data) +{ + struct winbindd_child *child = + (struct winbindd_child *)private_data; + TALLOC_CTX *mem_ctx = NULL; + struct winbindd_methods *methods; + SAM_UNK_INFO_12 lockout_policy; + NTSTATUS result; + + DEBUG(10,("account_lockout_policy_handler called\n")); + + TALLOC_FREE(child->lockout_policy_event); + + if ( !winbindd_can_contact_domain( child->domain ) ) { + DEBUG(10,("account_lockout_policy_handler: Removing myself since I " + "do not have an incoming trust to domain %s\n", + child->domain->name)); + + return; + } + + methods = child->domain->methods; + + mem_ctx = talloc_init("account_lockout_policy_handler ctx"); + if (!mem_ctx) { + result = NT_STATUS_NO_MEMORY; + } else { + result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy); + } + TALLOC_FREE(mem_ctx); + + if (!NT_STATUS_IS_OK(result)) { + DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n", + nt_errstr(result))); + } + + child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL, + timeval_current_ofs(3600, 0), + "account_lockout_policy_handler", + account_lockout_policy_handler, + child); +} + +/* Deal with a request to go offline. */ + +static void child_msg_offline(struct messaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_domain *domain; + const char *domainname = (const char *)data->data; + + if (data->data == NULL || data->length == 0) { + return; + } + + DEBUG(5,("child_msg_offline received for domain %s.\n", domainname)); + + if (!lp_winbind_offline_logon()) { + DEBUG(10,("child_msg_offline: rejecting offline message.\n")); + return; + } + + /* Mark the requested domain offline. */ + + for (domain = domain_list(); domain; domain = domain->next) { + if (domain->internal) { + continue; + } + if (strequal(domain->name, domainname)) { + DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name)); + set_domain_offline(domain); + } + } +} + +/* Deal with a request to go online. */ + +static void child_msg_online(struct messaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + struct winbindd_domain *domain; + const char *domainname = (const char *)data->data; + + if (data->data == NULL || data->length == 0) { + return; + } + + DEBUG(5,("child_msg_online received for domain %s.\n", domainname)); + + if (!lp_winbind_offline_logon()) { + DEBUG(10,("child_msg_online: rejecting online message.\n")); + return; + } + + /* Set our global state as online. */ + set_global_winbindd_state_online(); + + /* Try and mark everything online - delete any negative cache entries + to force a reconnect now. */ + + for (domain = domain_list(); domain; domain = domain->next) { + if (domain->internal) { + continue; + } + if (strequal(domain->name, domainname)) { + DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name)); + winbindd_flush_negative_conn_cache(domain); + set_domain_online_request(domain); + } + } +} + +static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx) +{ + struct winbindd_domain *domain; + char *buf = NULL; + + if ((buf = talloc_asprintf(mem_ctx, "global:%s ", + get_global_winbindd_state_offline() ? + "Offline":"Online")) == NULL) { + return NULL; + } + + for (domain = domain_list(); domain; domain = domain->next) { + if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ", + domain->name, + domain->online ? + "Online":"Offline")) == NULL) { + return NULL; + } + } + + buf = talloc_asprintf_append_buffer(buf, "\n"); + + DEBUG(5,("collect_onlinestatus: %s", buf)); + + return buf; +} + +static void child_msg_onlinestatus(struct messaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + TALLOC_CTX *mem_ctx; + const char *message; + struct server_id *sender; + + DEBUG(5,("winbind_msg_onlinestatus received.\n")); + + if (!data->data) { + return; + } + + sender = (struct server_id *)data->data; + + mem_ctx = talloc_init("winbind_msg_onlinestatus"); + if (mem_ctx == NULL) { + return; + } + + message = collect_onlinestatus(mem_ctx); + if (message == NULL) { + talloc_destroy(mem_ctx); + return; + } + + messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS, + (uint8 *)message, strlen(message) + 1); + + talloc_destroy(mem_ctx); +} + +static void child_msg_dump_event_list(struct messaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id server_id, + DATA_BLOB *data) +{ + DEBUG(5,("child_msg_dump_event_list received\n")); + + dump_event_list(winbind_event_context()); +} + + +static BOOL fork_domain_child(struct winbindd_child *child) +{ + int fdpair[2]; + struct winbindd_cli_state state; + struct winbindd_domain *domain; + + if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) { + DEBUG(0, ("Could not open child pipe: %s\n", + strerror(errno))); + return False; + } + + ZERO_STRUCT(state); + state.pid = sys_getpid(); + + /* Stop zombies */ + CatchChild(); + + child->pid = sys_fork(); + + if (child->pid == -1) { + DEBUG(0, ("Could not fork: %s\n", strerror(errno))); + return False; + } + + if (child->pid != 0) { + /* Parent */ + close(fdpair[0]); + child->next = child->prev = NULL; + DLIST_ADD(children, child); + child->event.fd = fdpair[1]; + child->event.flags = 0; + child->requests = NULL; + add_fd_event(&child->event); + return True; + } + + /* Child */ + + state.sock = fdpair[0]; + close(fdpair[1]); + + /* tdb needs special fork handling */ + if (tdb_reopen_all(1) == -1) { + DEBUG(0,("tdb_reopen_all failed.\n")); + _exit(0); + } + + close_conns_after_fork(); + + if (!override_logfile) { + lp_set_logfile(child->logfilename); + reopen_logs(); + } + + /* + * For clustering, we need to re-init our ctdbd connection after the + * fork + */ + if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context()))) + exit(1); + + /* Don't handle the same messages as our parent. */ + messaging_deregister(winbind_messaging_context(), + MSG_SMB_CONF_UPDATED, NULL); + messaging_deregister(winbind_messaging_context(), + MSG_SHUTDOWN, NULL); + messaging_deregister(winbind_messaging_context(), + MSG_WINBIND_OFFLINE, NULL); + messaging_deregister(winbind_messaging_context(), + MSG_WINBIND_ONLINE, NULL); + messaging_deregister(winbind_messaging_context(), + MSG_WINBIND_ONLINESTATUS, NULL); + messaging_deregister(winbind_messaging_context(), + MSG_DUMP_EVENT_LIST, NULL); + + /* Handle online/offline messages. */ + messaging_register(winbind_messaging_context(), NULL, + MSG_WINBIND_OFFLINE, child_msg_offline); + messaging_register(winbind_messaging_context(), NULL, + MSG_WINBIND_ONLINE, child_msg_online); + messaging_register(winbind_messaging_context(), NULL, + MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus); + messaging_register(winbind_messaging_context(), NULL, + MSG_DUMP_EVENT_LIST, child_msg_dump_event_list); + + if ( child->domain ) { + child->domain->startup = True; + child->domain->startup_time = time(NULL); + } + + /* Ensure we have no pending check_online events other + than one for this domain. */ + + for (domain = domain_list(); domain; domain = domain->next) { + if (domain != child->domain) { + TALLOC_FREE(domain->check_online_event); + } + } + + /* Ensure we're not handling an event inherited from + our parent. */ + + cancel_named_event(winbind_event_context(), + "krb5_ticket_refresh_handler"); + + /* We might be in the idmap child...*/ + if (child->domain && !(child->domain->internal) && + lp_winbind_offline_logon()) { + + set_domain_online_request(child->domain); + + child->lockout_policy_event = event_add_timed( + winbind_event_context(), NULL, timeval_zero(), + "account_lockout_policy_handler", + account_lockout_policy_handler, + child); + } + + while (1) { + + int ret; + fd_set read_fds; + struct timeval t; + struct timeval *tp; + struct timeval now; + TALLOC_CTX *frame = talloc_stackframe(); + + run_events(winbind_event_context(), 0, NULL, NULL); + + GetTimeOfDay(&now); + + if (child->domain && child->domain->startup && + (now.tv_sec > child->domain->startup_time + 30)) { + /* No longer in "startup" mode. */ + DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n", + child->domain->name )); + child->domain->startup = False; + } + + tp = get_timed_events_timeout(winbind_event_context(), &t); + if (tp) { + DEBUG(11,("select will use timeout of %u.%u seconds\n", + (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec )); + } + + /* Handle messages */ + + message_dispatch(winbind_messaging_context()); + + FD_ZERO(&read_fds); + FD_SET(state.sock, &read_fds); + + ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp); + + if (ret == 0) { + DEBUG(11,("nothing is ready yet, continue\n")); + TALLOC_FREE(frame); + continue; + } + + if (ret == -1 && errno == EINTR) { + /* We got a signal - continue. */ + TALLOC_FREE(frame); + continue; + } + + if (ret == -1 && errno != EINTR) { + DEBUG(0,("select error occured\n")); + TALLOC_FREE(frame); + perror("select"); + return False; + } + + /* fetch a request from the main daemon */ + child_read_request(&state); + + if (state.finished) { + /* we lost contact with our parent */ + exit(0); + } + + DEBUG(4,("child daemon request %d\n", (int)state.request.cmd)); + + ZERO_STRUCT(state.response); + state.request.null_term = '\0'; + child_process_request(child->domain, &state); + + SAFE_FREE(state.request.extra_data.data); + + cache_store_response(sys_getpid(), &state.response); + + SAFE_FREE(state.response.extra_data.data); + + /* We just send the result code back, the result + * structure needs to be fetched via the + * winbindd_cache. Hmm. That needs fixing... */ + + if (write_data(state.sock, + (const char *)&state.response.result, + sizeof(state.response.result)) != + sizeof(state.response.result)) { + DEBUG(0, ("Could not write result\n")); + exit(1); + } + TALLOC_FREE(frame); + } +} |