diff options
Diffstat (limited to 'ctdb/server/ctdb_daemon.c')
| -rw-r--r-- | ctdb/server/ctdb_daemon.c | 2248 |
1 files changed, 2248 insertions, 0 deletions
diff --git a/ctdb/server/ctdb_daemon.c b/ctdb/server/ctdb_daemon.c new file mode 100644 index 0000000..edd7d57 --- /dev/null +++ b/ctdb/server/ctdb_daemon.c @@ -0,0 +1,2248 @@ +/* + ctdb daemon code + + Copyright (C) Andrew Tridgell 2006 + + 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/>. +*/ + +#include "replace.h" +#include "system/network.h" +#include "system/filesys.h" +#include "system/wait.h" +#include "system/time.h" + +#include <talloc.h> +/* Allow use of deprecated function tevent_loop_allow_nesting() */ +#define TEVENT_DEPRECATED +#include <tevent.h> +#include <tdb.h> + +#include "lib/tdb_wrap/tdb_wrap.h" +#include "lib/util/dlinklist.h" +#include "lib/util/debug.h" +#include "lib/util/time.h" +#include "lib/util/blocking.h" +#include "lib/util/become_daemon.h" + +#include "version.h" +#include "ctdb_private.h" +#include "ctdb_client.h" + +#include "common/rb_tree.h" +#include "common/reqid.h" +#include "common/system.h" +#include "common/common.h" +#include "common/logging.h" +#include "common/pidfile.h" +#include "common/sock_io.h" + +struct ctdb_client_pid_list { + struct ctdb_client_pid_list *next, *prev; + struct ctdb_context *ctdb; + pid_t pid; + struct ctdb_client *client; +}; + +const char *ctdbd_pidfile = NULL; +static struct pidfile_context *ctdbd_pidfile_ctx = NULL; + +static void daemon_incoming_packet(void *, struct ctdb_req_header *); + +static pid_t __ctdbd_pid; + +static void print_exit_message(void) +{ + if (getpid() == __ctdbd_pid) { + DEBUG(DEBUG_NOTICE,("CTDB daemon shutting down\n")); + + /* Wait a second to allow pending log messages to be flushed */ + sleep(1); + } +} + +#ifdef HAVE_GETRUSAGE + +struct cpu_check_threshold_data { + unsigned short percent; + struct timeval timeofday; + struct timeval ru_time; +}; + +static void ctdb_cpu_check_threshold(struct tevent_context *ev, + struct tevent_timer *te, + struct timeval tv, + void *private_data) +{ + struct ctdb_context *ctdb = talloc_get_type_abort( + private_data, struct ctdb_context); + uint32_t interval = 60; + + static unsigned short threshold = 0; + static struct cpu_check_threshold_data prev = { + .percent = 0, + .timeofday = { .tv_sec = 0 }, + .ru_time = { .tv_sec = 0 }, + }; + + struct rusage usage; + struct cpu_check_threshold_data curr = { + .percent = 0, + }; + int64_t ru_time_diff, timeofday_diff; + bool first; + int ret; + + /* + * Cache the threshold so that we don't waste time checking + * the environment variable every time + */ + if (threshold == 0) { + const char *t; + + threshold = 90; + + t = getenv("CTDB_TEST_CPU_USAGE_THRESHOLD"); + if (t != NULL) { + int th; + + th = atoi(t); + if (th <= 0 || th > 100) { + DBG_WARNING("Failed to parse env var: %s\n", t); + } else { + threshold = th; + } + } + } + + ret = getrusage(RUSAGE_SELF, &usage); + if (ret != 0) { + DBG_WARNING("rusage() failed: %d\n", ret); + goto next; + } + + /* Sum the system and user CPU usage */ + curr.ru_time = timeval_sum(&usage.ru_utime, &usage.ru_stime); + + curr.timeofday = tv; + + first = timeval_is_zero(&prev.timeofday); + if (first) { + /* No previous values recorded so no calculation to do */ + goto done; + } + + timeofday_diff = usec_time_diff(&curr.timeofday, &prev.timeofday); + if (timeofday_diff <= 0) { + /* + * Time went backwards or didn't progress so no (sane) + * calculation can be done + */ + goto done; + } + + ru_time_diff = usec_time_diff(&curr.ru_time, &prev.ru_time); + + curr.percent = ru_time_diff * 100 / timeofday_diff; + + if (curr.percent >= threshold) { + /* Log only if the utilisation changes */ + if (curr.percent != prev.percent) { + D_WARNING("WARNING: CPU utilisation %hu%% >= " + "threshold (%hu%%)\n", + curr.percent, + threshold); + } + } else { + /* Log if the utilisation falls below the threshold */ + if (prev.percent >= threshold) { + D_WARNING("WARNING: CPU utilisation %hu%% < " + "threshold (%hu%%)\n", + curr.percent, + threshold); + } + } + +done: + prev = curr; + +next: + tevent_add_timer(ctdb->ev, ctdb, + timeval_current_ofs(interval, 0), + ctdb_cpu_check_threshold, + ctdb); +} + +static void ctdb_start_cpu_check_threshold(struct ctdb_context *ctdb) +{ + tevent_add_timer(ctdb->ev, ctdb, + timeval_current(), + ctdb_cpu_check_threshold, + ctdb); +} +#endif /* HAVE_GETRUSAGE */ + +static void ctdb_time_tick(struct tevent_context *ev, struct tevent_timer *te, + struct timeval t, void *private_data) +{ + struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context); + + if (getpid() != ctdb->ctdbd_pid) { + return; + } + + tevent_add_timer(ctdb->ev, ctdb, + timeval_current_ofs(1, 0), + ctdb_time_tick, ctdb); +} + +/* Used to trigger a dummy event once per second, to make + * detection of hangs more reliable. + */ +static void ctdb_start_time_tickd(struct ctdb_context *ctdb) +{ + tevent_add_timer(ctdb->ev, ctdb, + timeval_current_ofs(1, 0), + ctdb_time_tick, ctdb); +} + +static void ctdb_start_periodic_events(struct ctdb_context *ctdb) +{ + /* start monitoring for connected/disconnected nodes */ + ctdb_start_keepalive(ctdb); + + /* start periodic update of tcp tickle lists */ + ctdb_start_tcp_tickle_update(ctdb); + + /* start listening for recovery daemon pings */ + ctdb_control_recd_ping(ctdb); + + /* start listening to timer ticks */ + ctdb_start_time_tickd(ctdb); + +#ifdef HAVE_GETRUSAGE + ctdb_start_cpu_check_threshold(ctdb); +#endif /* HAVE_GETRUSAGE */ +} + +static void ignore_signal(int signum) +{ + struct sigaction act; + + memset(&act, 0, sizeof(act)); + + act.sa_handler = SIG_IGN; + sigemptyset(&act.sa_mask); + sigaddset(&act.sa_mask, signum); + sigaction(signum, &act, NULL); +} + + +/* + send a packet to a client + */ +static int daemon_queue_send(struct ctdb_client *client, struct ctdb_req_header *hdr) +{ + CTDB_INCREMENT_STAT(client->ctdb, client_packets_sent); + if (hdr->operation == CTDB_REQ_MESSAGE) { + if (ctdb_queue_length(client->queue) > client->ctdb->tunable.max_queue_depth_drop_msg) { + DEBUG(DEBUG_ERR,("CTDB_REQ_MESSAGE queue full - killing client connection.\n")); + talloc_free(client); + return -1; + } + } + return ctdb_queue_send(client->queue, (uint8_t *)hdr, hdr->length); +} + +/* + message handler for when we are in daemon mode. This redirects the message + to the right client + */ +static void daemon_message_handler(uint64_t srvid, TDB_DATA data, + void *private_data) +{ + struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client); + struct ctdb_req_message_old *r; + int len; + + /* construct a message to send to the client containing the data */ + len = offsetof(struct ctdb_req_message_old, data) + data.dsize; + r = ctdbd_allocate_pkt(client->ctdb, client->ctdb, CTDB_REQ_MESSAGE, + len, struct ctdb_req_message_old); + CTDB_NO_MEMORY_VOID(client->ctdb, r); + + talloc_set_name_const(r, "req_message packet"); + + r->srvid = srvid; + r->datalen = data.dsize; + memcpy(&r->data[0], data.dptr, data.dsize); + + daemon_queue_send(client, &r->hdr); + + talloc_free(r); +} + +/* + this is called when the ctdb daemon received a ctdb request to + set the srvid from the client + */ +int daemon_register_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid) +{ + struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client); + int res; + if (client == NULL) { + DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_register_message_handler\n")); + return -1; + } + res = srvid_register(ctdb->srv, client, srvid, daemon_message_handler, + client); + if (res != 0) { + DEBUG(DEBUG_ERR,(__location__ " Failed to register handler %llu in daemon\n", + (unsigned long long)srvid)); + } else { + DEBUG(DEBUG_INFO,(__location__ " Registered message handler for srvid=%llu\n", + (unsigned long long)srvid)); + } + + return res; +} + +/* + this is called when the ctdb daemon received a ctdb request to + remove a srvid from the client + */ +int daemon_deregister_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid) +{ + struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client); + if (client == NULL) { + DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_deregister_message_handler\n")); + return -1; + } + return srvid_deregister(ctdb->srv, srvid, client); +} + +void daemon_tunnel_handler(uint64_t tunnel_id, TDB_DATA data, + void *private_data) +{ + struct ctdb_client *client = + talloc_get_type_abort(private_data, struct ctdb_client); + struct ctdb_req_tunnel_old *c, *pkt; + size_t len; + + pkt = (struct ctdb_req_tunnel_old *)data.dptr; + + len = offsetof(struct ctdb_req_tunnel_old, data) + pkt->datalen; + c = ctdbd_allocate_pkt(client->ctdb, client->ctdb, CTDB_REQ_TUNNEL, + len, struct ctdb_req_tunnel_old); + if (c == NULL) { + DEBUG(DEBUG_ERR, ("Memory error in daemon_tunnel_handler\n")); + return; + } + + talloc_set_name_const(c, "req_tunnel packet"); + + c->tunnel_id = tunnel_id; + c->flags = pkt->flags; + c->datalen = pkt->datalen; + memcpy(c->data, pkt->data, pkt->datalen); + + daemon_queue_send(client, &c->hdr); + + talloc_free(c); +} + +/* + destroy a ctdb_client +*/ +static int ctdb_client_destructor(struct ctdb_client *client) +{ + struct ctdb_db_context *ctdb_db; + + ctdb_takeover_client_destructor_hook(client); + reqid_remove(client->ctdb->idr, client->client_id); + client->ctdb->num_clients--; + + if (client->num_persistent_updates != 0) { + DEBUG(DEBUG_ERR,(__location__ " Client disconnecting with %u persistent updates in flight. Starting recovery\n", client->num_persistent_updates)); + client->ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + } + ctdb_db = find_ctdb_db(client->ctdb, client->db_id); + if (ctdb_db) { + DEBUG(DEBUG_ERR, (__location__ " client exit while transaction " + "commit active. Forcing recovery.\n")); + client->ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + + /* + * trans3 transaction state: + * + * The destructor sets the pointer to NULL. + */ + talloc_free(ctdb_db->persistent_state); + } + + return 0; +} + + +/* + this is called when the ctdb daemon received a ctdb request message + from a local client over the unix domain socket + */ +static void daemon_request_message_from_client(struct ctdb_client *client, + struct ctdb_req_message_old *c) +{ + TDB_DATA data; + int res; + + if (c->hdr.destnode == CTDB_CURRENT_NODE) { + c->hdr.destnode = ctdb_get_pnn(client->ctdb); + } + + /* maybe the message is for another client on this node */ + if (ctdb_get_pnn(client->ctdb)==c->hdr.destnode) { + ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c); + return; + } + + /* its for a remote node */ + data.dptr = &c->data[0]; + data.dsize = c->datalen; + res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode, + c->srvid, data); + if (res != 0) { + DEBUG(DEBUG_ERR,(__location__ " Failed to send message to remote node %u\n", + c->hdr.destnode)); + } +} + + +struct daemon_call_state { + struct ctdb_client *client; + uint32_t reqid; + struct ctdb_call *call; + struct timeval start_time; + + /* readonly request ? */ + uint32_t readonly_fetch; + uint32_t client_callid; +}; + +/* + complete a call from a client +*/ +static void daemon_call_from_client_callback(struct ctdb_call_state *state) +{ + struct daemon_call_state *dstate = talloc_get_type(state->async.private_data, + struct daemon_call_state); + struct ctdb_reply_call_old *r; + int res; + uint32_t length; + struct ctdb_client *client = dstate->client; + struct ctdb_db_context *ctdb_db = state->ctdb_db; + + talloc_steal(client, dstate); + talloc_steal(dstate, dstate->call); + + res = ctdb_daemon_call_recv(state, dstate->call); + if (res != 0) { + DEBUG(DEBUG_ERR, (__location__ " ctdbd_call_recv() returned error\n")); + CTDB_DECREMENT_STAT(client->ctdb, pending_calls); + + CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 1", call_latency, dstate->start_time); + return; + } + + length = offsetof(struct ctdb_reply_call_old, data) + dstate->call->reply_data.dsize; + /* If the client asked for readonly FETCH, we remapped this to + FETCH_WITH_HEADER when calling the daemon. So we must + strip the extra header off the reply data before passing + it back to the client. + */ + if (dstate->readonly_fetch + && dstate->client_callid == CTDB_FETCH_FUNC) { + length -= sizeof(struct ctdb_ltdb_header); + } + + r = ctdbd_allocate_pkt(client->ctdb, dstate, CTDB_REPLY_CALL, + length, struct ctdb_reply_call_old); + if (r == NULL) { + DEBUG(DEBUG_ERR, (__location__ " Failed to allocate reply_call in ctdb daemon\n")); + CTDB_DECREMENT_STAT(client->ctdb, pending_calls); + CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 2", call_latency, dstate->start_time); + return; + } + r->hdr.reqid = dstate->reqid; + r->status = dstate->call->status; + + if (dstate->readonly_fetch + && dstate->client_callid == CTDB_FETCH_FUNC) { + /* client only asked for a FETCH so we must strip off + the extra ctdb_ltdb header + */ + r->datalen = dstate->call->reply_data.dsize - sizeof(struct ctdb_ltdb_header); + memcpy(&r->data[0], dstate->call->reply_data.dptr + sizeof(struct ctdb_ltdb_header), r->datalen); + } else { + r->datalen = dstate->call->reply_data.dsize; + memcpy(&r->data[0], dstate->call->reply_data.dptr, r->datalen); + } + + res = daemon_queue_send(client, &r->hdr); + if (res == -1) { + /* client is dead - return immediately */ + return; + } + if (res != 0) { + DEBUG(DEBUG_ERR, (__location__ " Failed to queue packet from daemon to client\n")); + } + CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 3", call_latency, dstate->start_time); + CTDB_DECREMENT_STAT(client->ctdb, pending_calls); + talloc_free(dstate); +} + +struct ctdb_daemon_packet_wrap { + struct ctdb_context *ctdb; + uint32_t client_id; +}; + +/* + a wrapper to catch disconnected clients + */ +static void daemon_incoming_packet_wrap(void *p, struct ctdb_req_header *hdr) +{ + struct ctdb_client *client; + struct ctdb_daemon_packet_wrap *w = talloc_get_type(p, + struct ctdb_daemon_packet_wrap); + if (w == NULL) { + DEBUG(DEBUG_CRIT,(__location__ " Bad packet type '%s'\n", talloc_get_name(p))); + return; + } + + client = reqid_find(w->ctdb->idr, w->client_id, struct ctdb_client); + if (client == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n", + w->client_id)); + talloc_free(w); + return; + } + talloc_free(w); + + /* process it */ + daemon_incoming_packet(client, hdr); +} + +struct ctdb_deferred_fetch_call { + struct ctdb_deferred_fetch_call *next, *prev; + struct ctdb_req_call_old *c; + struct ctdb_daemon_packet_wrap *w; +}; + +struct ctdb_deferred_fetch_queue { + struct ctdb_deferred_fetch_call *deferred_calls; +}; + +struct ctdb_deferred_requeue { + struct ctdb_deferred_fetch_call *dfc; + struct ctdb_client *client; +}; + +/* called from a timer event and starts reprocessing the deferred call.*/ +static void reprocess_deferred_call(struct tevent_context *ev, + struct tevent_timer *te, + struct timeval t, void *private_data) +{ + struct ctdb_deferred_requeue *dfr = (struct ctdb_deferred_requeue *)private_data; + struct ctdb_client *client = dfr->client; + + talloc_steal(client, dfr->dfc->c); + daemon_incoming_packet(client, (struct ctdb_req_header *)dfr->dfc->c); + talloc_free(dfr); +} + +/* the referral context is destroyed either after a timeout or when the initial + fetch-lock has finished. + at this stage, immediately start reprocessing the queued up deferred + calls so they get reprocessed immediately (and since we are dmaster at + this stage, trigger the waiting smbd processes to pick up and acquire the + record right away. +*/ +static int deferred_fetch_queue_destructor(struct ctdb_deferred_fetch_queue *dfq) +{ + + /* need to reprocess the packets from the queue explicitly instead of + just using a normal destructor since we need to + call the clients in the same order as the requests queued up + */ + while (dfq->deferred_calls != NULL) { + struct ctdb_client *client; + struct ctdb_deferred_fetch_call *dfc = dfq->deferred_calls; + struct ctdb_deferred_requeue *dfr; + + DLIST_REMOVE(dfq->deferred_calls, dfc); + + client = reqid_find(dfc->w->ctdb->idr, dfc->w->client_id, struct ctdb_client); + if (client == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n", + dfc->w->client_id)); + continue; + } + + /* process it by pushing it back onto the eventloop */ + dfr = talloc(client, struct ctdb_deferred_requeue); + if (dfr == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate deferred fetch requeue structure\n")); + continue; + } + + dfr->dfc = talloc_steal(dfr, dfc); + dfr->client = client; + + tevent_add_timer(dfc->w->ctdb->ev, client, timeval_zero(), + reprocess_deferred_call, dfr); + } + + return 0; +} + +/* insert the new deferral context into the rb tree. + there should never be a pre-existing context here, but check for it + warn and destroy the previous context if there is already a deferral context + for this key. +*/ +static void *insert_dfq_callback(void *parm, void *data) +{ + if (data) { + DEBUG(DEBUG_ERR,("Already have DFQ registered. Free old %p and create new %p\n", data, parm)); + talloc_free(data); + } + return parm; +} + +/* if the original fetch-lock did not complete within a reasonable time, + free the context and context for all deferred requests to cause them to be + re-inserted into the event system. +*/ +static void dfq_timeout(struct tevent_context *ev, struct tevent_timer *te, + struct timeval t, void *private_data) +{ + talloc_free(private_data); +} + +/* This function is used in the local daemon to register a KEY in a database + for being "fetched" + While the remote fetch is in-flight, any futher attempts to re-fetch the + same record will be deferred until the fetch completes. +*/ +static int setup_deferred_fetch_locks(struct ctdb_db_context *ctdb_db, struct ctdb_call *call) +{ + uint32_t *k; + struct ctdb_deferred_fetch_queue *dfq; + + k = ctdb_key_to_idkey(call, call->key); + if (k == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch\n")); + return -1; + } + + dfq = talloc(call, struct ctdb_deferred_fetch_queue); + if (dfq == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch queue structure\n")); + talloc_free(k); + return -1; + } + dfq->deferred_calls = NULL; + + trbt_insertarray32_callback(ctdb_db->deferred_fetch, k[0], &k[0], insert_dfq_callback, dfq); + + talloc_set_destructor(dfq, deferred_fetch_queue_destructor); + + /* if the fetch havent completed in 30 seconds, just tear it all down + and let it try again as the events are reissued */ + tevent_add_timer(ctdb_db->ctdb->ev, dfq, timeval_current_ofs(30, 0), + dfq_timeout, dfq); + + talloc_free(k); + return 0; +} + +/* check if this is a duplicate request to a fetch already in-flight + if it is, make this call deferred to be reprocessed later when + the in-flight fetch completes. +*/ +static int requeue_duplicate_fetch(struct ctdb_db_context *ctdb_db, struct ctdb_client *client, TDB_DATA key, struct ctdb_req_call_old *c) +{ + uint32_t *k; + struct ctdb_deferred_fetch_queue *dfq; + struct ctdb_deferred_fetch_call *dfc; + + k = ctdb_key_to_idkey(c, key); + if (k == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch\n")); + return -1; + } + + dfq = trbt_lookuparray32(ctdb_db->deferred_fetch, k[0], &k[0]); + if (dfq == NULL) { + talloc_free(k); + return -1; + } + + + talloc_free(k); + + dfc = talloc(dfq, struct ctdb_deferred_fetch_call); + if (dfc == NULL) { + DEBUG(DEBUG_ERR, ("Failed to allocate deferred fetch call structure\n")); + return -1; + } + + dfc->w = talloc(dfc, struct ctdb_daemon_packet_wrap); + if (dfc->w == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate deferred fetch daemon packet wrap structure\n")); + talloc_free(dfc); + return -1; + } + + dfc->c = talloc_steal(dfc, c); + dfc->w->ctdb = ctdb_db->ctdb; + dfc->w->client_id = client->client_id; + + DLIST_ADD_END(dfq->deferred_calls, dfc); + + return 0; +} + + +/* + this is called when the ctdb daemon received a ctdb request call + from a local client over the unix domain socket + */ +static void daemon_request_call_from_client(struct ctdb_client *client, + struct ctdb_req_call_old *c) +{ + struct ctdb_call_state *state; + struct ctdb_db_context *ctdb_db; + struct daemon_call_state *dstate; + struct ctdb_call *call; + struct ctdb_ltdb_header header; + TDB_DATA key, data; + int ret; + struct ctdb_context *ctdb = client->ctdb; + struct ctdb_daemon_packet_wrap *w; + + CTDB_INCREMENT_STAT(ctdb, total_calls); + CTDB_INCREMENT_STAT(ctdb, pending_calls); + + ctdb_db = find_ctdb_db(client->ctdb, c->db_id); + if (!ctdb_db) { + DEBUG(DEBUG_ERR, (__location__ " Unknown database in request. db_id==0x%08x", + c->db_id)); + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + + if (ctdb_db->unhealthy_reason) { + /* + * this is just a warning, as the tdb should be empty anyway, + * and only persistent databases can be unhealthy, which doesn't + * use this code patch + */ + DEBUG(DEBUG_WARNING,("warn: db(%s) unhealty in daemon_request_call_from_client(): %s\n", + ctdb_db->db_name, ctdb_db->unhealthy_reason)); + } + + key.dptr = c->data; + key.dsize = c->keylen; + + w = talloc(ctdb, struct ctdb_daemon_packet_wrap); + CTDB_NO_MEMORY_VOID(ctdb, w); + + w->ctdb = ctdb; + w->client_id = client->client_id; + + ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, + (struct ctdb_req_header *)c, &data, + daemon_incoming_packet_wrap, w, true); + if (ret == -2) { + /* will retry later */ + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + + talloc_free(w); + + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " Unable to fetch record\n")); + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + + + /* check if this fetch request is a duplicate for a + request we already have in flight. If so defer it until + the first request completes. + */ + if (ctdb->tunable.fetch_collapse == 1) { + if (requeue_duplicate_fetch(ctdb_db, client, key, c) == 0) { + ret = ctdb_ltdb_unlock(ctdb_db, key); + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret)); + } + CTDB_DECREMENT_STAT(ctdb, pending_calls); + talloc_free(data.dptr); + return; + } + } + + /* Dont do READONLY if we don't have a tracking database */ + if ((c->flags & CTDB_WANT_READONLY) && !ctdb_db_readonly(ctdb_db)) { + c->flags &= ~CTDB_WANT_READONLY; + } + + if (header.flags & CTDB_REC_RO_REVOKE_COMPLETE) { + header.flags &= ~CTDB_REC_RO_FLAGS; + CTDB_INCREMENT_STAT(ctdb, total_ro_revokes); + CTDB_INCREMENT_DB_STAT(ctdb_db, db_ro_revokes); + if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) { + ctdb_fatal(ctdb, "Failed to write header with cleared REVOKE flag"); + } + /* and clear out the tracking data */ + if (tdb_delete(ctdb_db->rottdb, key) != 0) { + DEBUG(DEBUG_ERR,(__location__ " Failed to clear out trackingdb record\n")); + } + } + + /* if we are revoking, we must defer all other calls until the revoke + * had completed. + */ + if (header.flags & CTDB_REC_RO_REVOKING_READONLY) { + talloc_free(data.dptr); + ret = ctdb_ltdb_unlock(ctdb_db, key); + + if (ctdb_add_revoke_deferred_call(ctdb, ctdb_db, key, (struct ctdb_req_header *)c, daemon_incoming_packet, client) != 0) { + ctdb_fatal(ctdb, "Failed to add deferred call for revoke child"); + } + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + + if ((header.dmaster == ctdb->pnn) + && (!(c->flags & CTDB_WANT_READONLY)) + && (header.flags & (CTDB_REC_RO_HAVE_DELEGATIONS|CTDB_REC_RO_HAVE_READONLY)) ) { + header.flags |= CTDB_REC_RO_REVOKING_READONLY; + if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) { + ctdb_fatal(ctdb, "Failed to store record with HAVE_DELEGATIONS set"); + } + ret = ctdb_ltdb_unlock(ctdb_db, key); + + if (ctdb_start_revoke_ro_record(ctdb, ctdb_db, key, &header, data) != 0) { + ctdb_fatal(ctdb, "Failed to start record revoke"); + } + talloc_free(data.dptr); + + if (ctdb_add_revoke_deferred_call(ctdb, ctdb_db, key, (struct ctdb_req_header *)c, daemon_incoming_packet, client) != 0) { + ctdb_fatal(ctdb, "Failed to add deferred call for revoke child"); + } + + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + + dstate = talloc(client, struct daemon_call_state); + if (dstate == NULL) { + ret = ctdb_ltdb_unlock(ctdb_db, key); + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret)); + } + + DEBUG(DEBUG_ERR,(__location__ " Unable to allocate dstate\n")); + CTDB_DECREMENT_STAT(ctdb, pending_calls); + return; + } + dstate->start_time = timeval_current(); + dstate->client = client; + dstate->reqid = c->hdr.reqid; + talloc_steal(dstate, data.dptr); + + call = dstate->call = talloc_zero(dstate, struct ctdb_call); + if (call == NULL) { + ret = ctdb_ltdb_unlock(ctdb_db, key); + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret)); + } + + DEBUG(DEBUG_ERR,(__location__ " Unable to allocate call\n")); + CTDB_DECREMENT_STAT(ctdb, pending_calls); + CTDB_UPDATE_LATENCY(ctdb, ctdb_db, "call_from_client 1", call_latency, dstate->start_time); + return; + } + + dstate->readonly_fetch = 0; + call->call_id = c->callid; + call->key = key; + call->call_data.dptr = c->data + c->keylen; + call->call_data.dsize = c->calldatalen; + call->flags = c->flags; + + if (c->flags & CTDB_WANT_READONLY) { + /* client wants readonly record, so translate this into a + fetch with header. remember what the client asked for + so we can remap the reply back to the proper format for + the client in the reply + */ + dstate->client_callid = call->call_id; + call->call_id = CTDB_FETCH_WITH_HEADER_FUNC; + dstate->readonly_fetch = 1; + } + + if (header.dmaster == ctdb->pnn) { + state = ctdb_call_local_send(ctdb_db, call, &header, &data); + } else { + state = ctdb_daemon_call_send_remote(ctdb_db, call, &header); + if (ctdb->tunable.fetch_collapse == 1) { + /* This request triggered a remote fetch-lock. + set up a deferral for this key so any additional + fetch-locks are deferred until the current one + finishes. + */ + setup_deferred_fetch_locks(ctdb_db, call); + } + } + + ret = ctdb_ltdb_unlock(ctdb_db, key); + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret)); + } + + if (state == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Unable to setup call send\n")); + CTDB_DECREMENT_STAT(ctdb, pending_calls); + CTDB_UPDATE_LATENCY(ctdb, ctdb_db, "call_from_client 2", call_latency, dstate->start_time); + return; + } + talloc_steal(state, dstate); + talloc_steal(client, state); + + state->async.fn = daemon_call_from_client_callback; + state->async.private_data = dstate; +} + + +static void daemon_request_control_from_client(struct ctdb_client *client, + struct ctdb_req_control_old *c); +static void daemon_request_tunnel_from_client(struct ctdb_client *client, + struct ctdb_req_tunnel_old *c); + +/* data contains a packet from the client */ +static void daemon_incoming_packet(void *p, struct ctdb_req_header *hdr) +{ + struct ctdb_client *client = talloc_get_type(p, struct ctdb_client); + TALLOC_CTX *tmp_ctx; + struct ctdb_context *ctdb = client->ctdb; + + /* place the packet as a child of a tmp_ctx. We then use + talloc_free() below to free it. If any of the calls want + to keep it, then they will steal it somewhere else, and the + talloc_free() will be a no-op */ + tmp_ctx = talloc_new(client); + talloc_steal(tmp_ctx, hdr); + + if (hdr->ctdb_magic != CTDB_MAGIC) { + ctdb_set_error(client->ctdb, "Non CTDB packet rejected in daemon\n"); + goto done; + } + + if (hdr->ctdb_version != CTDB_PROTOCOL) { + ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version); + goto done; + } + + switch (hdr->operation) { + case CTDB_REQ_CALL: + CTDB_INCREMENT_STAT(ctdb, client.req_call); + daemon_request_call_from_client(client, (struct ctdb_req_call_old *)hdr); + break; + + case CTDB_REQ_MESSAGE: + CTDB_INCREMENT_STAT(ctdb, client.req_message); + daemon_request_message_from_client(client, (struct ctdb_req_message_old *)hdr); + break; + + case CTDB_REQ_CONTROL: + CTDB_INCREMENT_STAT(ctdb, client.req_control); + daemon_request_control_from_client(client, (struct ctdb_req_control_old *)hdr); + break; + + case CTDB_REQ_TUNNEL: + CTDB_INCREMENT_STAT(ctdb, client.req_tunnel); + daemon_request_tunnel_from_client(client, (struct ctdb_req_tunnel_old *)hdr); + break; + + default: + DEBUG(DEBUG_CRIT,(__location__ " daemon: unrecognized operation %u\n", + hdr->operation)); + } + +done: + talloc_free(tmp_ctx); +} + +/* + called when the daemon gets a incoming packet + */ +static void ctdb_daemon_read_cb(uint8_t *data, size_t cnt, void *args) +{ + struct ctdb_client *client = talloc_get_type(args, struct ctdb_client); + struct ctdb_req_header *hdr; + + if (cnt == 0) { + talloc_free(client); + return; + } + + CTDB_INCREMENT_STAT(client->ctdb, client_packets_recv); + + if (cnt < sizeof(*hdr)) { + ctdb_set_error(client->ctdb, "Bad packet length %u in daemon\n", + (unsigned)cnt); + return; + } + hdr = (struct ctdb_req_header *)data; + + if (hdr->ctdb_magic != CTDB_MAGIC) { + ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n"); + goto err_out; + } + + if (hdr->ctdb_version != CTDB_PROTOCOL) { + ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version); + goto err_out; + } + + DEBUG(DEBUG_DEBUG,(__location__ " client request %u of type %u length %u from " + "node %u to %u\n", hdr->reqid, hdr->operation, hdr->length, + hdr->srcnode, hdr->destnode)); + + /* it is the responsibility of the incoming packet function to free 'data' */ + daemon_incoming_packet(client, hdr); + return; + +err_out: + TALLOC_FREE(data); +} + + +static int ctdb_clientpid_destructor(struct ctdb_client_pid_list *client_pid) +{ + if (client_pid->ctdb->client_pids != NULL) { + DLIST_REMOVE(client_pid->ctdb->client_pids, client_pid); + } + + return 0; +} + +static int get_new_client_id(struct reqid_context *idr, + struct ctdb_client *client, + uint32_t *out) +{ + uint32_t client_id; + + client_id = reqid_new(idr, client); + /* + * Some places in the code (e.g. ctdb_control_db_attach(), + * ctdb_control_db_detach()) assign a special meaning to + * client_id 0. The assumption is that if client_id is 0 then + * the control has come from another daemon. Therefore, we + * should never return client_id == 0. + */ + if (client_id == 0) { + /* + * Don't leak ID 0. This is safe because the ID keeps + * increasing. A test will be added to ensure that + * this doesn't change. + */ + reqid_remove(idr, 0); + + client_id = reqid_new(idr, client); + } + + if (client_id == REQID_INVALID) { + return EINVAL; + } + + if (client_id == 0) { + /* Every other ID must have been used and we can't use 0 */ + reqid_remove(idr, 0); + return EINVAL; + } + + *out = client_id; + return 0; +} + +static void ctdb_accept_client(struct tevent_context *ev, + struct tevent_fd *fde, uint16_t flags, + void *private_data) +{ + struct sockaddr_un addr; + socklen_t len; + int fd; + struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context); + struct ctdb_client *client; + struct ctdb_client_pid_list *client_pid; + pid_t peer_pid = 0; + int ret; + + memset(&addr, 0, sizeof(addr)); + len = sizeof(addr); + fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len); + if (fd == -1) { + return; + } + smb_set_close_on_exec(fd); + + ret = set_blocking(fd, false); + if (ret != 0) { + DEBUG(DEBUG_ERR, + (__location__ + " failed to set socket non-blocking (%s)\n", + strerror(errno))); + close(fd); + return; + } + + set_close_on_exec(fd); + + DEBUG(DEBUG_DEBUG,(__location__ " Created SOCKET FD:%d to connected child\n", fd)); + + client = talloc_zero(ctdb, struct ctdb_client); + if (ctdb_get_peer_pid(fd, &peer_pid) == 0) { + DEBUG(DEBUG_INFO,("Connected client with pid:%u\n", (unsigned)peer_pid)); + } + + client->ctdb = ctdb; + client->fd = fd; + + ret = get_new_client_id(ctdb->idr, client, &client->client_id); + if (ret != 0) { + DBG_ERR("Unable to get client ID (%d)\n", ret); + close(fd); + talloc_free(client); + return; + } + + client->pid = peer_pid; + + client_pid = talloc(client, struct ctdb_client_pid_list); + if (client_pid == NULL) { + DEBUG(DEBUG_ERR,("Failed to allocate client pid structure\n")); + close(fd); + talloc_free(client); + return; + } + client_pid->ctdb = ctdb; + client_pid->pid = peer_pid; + client_pid->client = client; + + DLIST_ADD(ctdb->client_pids, client_pid); + + client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT, + ctdb_daemon_read_cb, client, + "client-%u", client->pid); + + talloc_set_destructor(client, ctdb_client_destructor); + talloc_set_destructor(client_pid, ctdb_clientpid_destructor); + ctdb->num_clients++; +} + + + +/* + * Create a unix domain socket, bind it, secure it and listen. Return + * the file descriptor for the socket. + */ +static int ux_socket_bind(struct ctdb_context *ctdb, bool test_mode_enabled) +{ + struct sockaddr_un addr = { .sun_family = AF_UNIX }; + int ret; + + ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0); + if (ctdb->daemon.sd == -1) { + return -1; + } + + strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path)-1); + + if (! sock_clean(ctdb->daemon.name)) { + return -1; + } + + set_close_on_exec(ctdb->daemon.sd); + + ret = set_blocking(ctdb->daemon.sd, false); + if (ret != 0) { + DBG_ERR("Failed to set socket non-blocking (%s)\n", + strerror(errno)); + goto failed; + } + + ret = bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)); + if (ret == -1) { + D_ERR("Unable to bind on ctdb socket '%s'\n", ctdb->daemon.name); + goto failed; + } + + if (!test_mode_enabled) { + ret = chown(ctdb->daemon.name, geteuid(), getegid()); + if (ret != 0 && !test_mode_enabled) { + D_ERR("Unable to secure (chown) ctdb socket '%s'\n", + ctdb->daemon.name); + goto failed; + } + } + + ret = chmod(ctdb->daemon.name, 0700); + if (ret != 0) { + D_ERR("Unable to secure (chmod) ctdb socket '%s'\n", + ctdb->daemon.name); + goto failed; + } + + + ret = listen(ctdb->daemon.sd, 100); + if (ret != 0) { + D_ERR("Unable to listen on ctdb socket '%s'\n", + ctdb->daemon.name); + goto failed; + } + + D_NOTICE("Listening to ctdb socket %s\n", ctdb->daemon.name); + return 0; + +failed: + close(ctdb->daemon.sd); + ctdb->daemon.sd = -1; + return -1; +} + +struct ctdb_node *ctdb_find_node(struct ctdb_context *ctdb, uint32_t pnn) +{ + struct ctdb_node *node = NULL; + unsigned int i; + + if (pnn == CTDB_CURRENT_NODE) { + pnn = ctdb->pnn; + } + + /* Always found: PNN correctly set just before this is called */ + for (i = 0; i < ctdb->num_nodes; i++) { + node = ctdb->nodes[i]; + if (pnn == node->pnn) { + return node; + } + } + + return NULL; +} + +static void initialise_node_flags (struct ctdb_context *ctdb) +{ + struct ctdb_node *node = NULL; + + node = ctdb_find_node(ctdb, CTDB_CURRENT_NODE); + /* + * PNN correctly set just before this is called so always + * found but keep static analysers happy... + */ + if (node == NULL) { + DBG_ERR("Unable to find current node\n"); + return; + } + + node->flags &= ~NODE_FLAGS_DISCONNECTED; + + /* do we start out in DISABLED mode? */ + if (ctdb->start_as_disabled != 0) { + D_ERR("This node is configured to start in DISABLED state\n"); + node->flags |= NODE_FLAGS_PERMANENTLY_DISABLED; + } + /* do we start out in STOPPED mode? */ + if (ctdb->start_as_stopped != 0) { + D_ERR("This node is configured to start in STOPPED state\n"); + node->flags |= NODE_FLAGS_STOPPED; + } +} + +static void ctdb_setup_event_callback(struct ctdb_context *ctdb, int status, + void *private_data) +{ + if (status != 0) { + ctdb_die(ctdb, "Failed to run setup event"); + } + ctdb_run_notification_script(ctdb, "setup"); + + /* Start the recovery daemon */ + if (ctdb_start_recoverd(ctdb) != 0) { + DEBUG(DEBUG_ALERT,("Failed to start recovery daemon\n")); + exit(11); + } + + ctdb_start_periodic_events(ctdb); + + ctdb_wait_for_first_recovery(ctdb); +} + +static struct timeval tevent_before_wait_ts; +static struct timeval tevent_after_wait_ts; + +static void ctdb_tevent_trace_init(void) +{ + struct timeval now; + + now = timeval_current(); + + tevent_before_wait_ts = now; + tevent_after_wait_ts = now; +} + +static void ctdb_tevent_trace(enum tevent_trace_point tp, + void *private_data) +{ + struct timeval diff; + struct timeval now; + struct ctdb_context *ctdb = + talloc_get_type(private_data, struct ctdb_context); + + if (getpid() != ctdb->ctdbd_pid) { + return; + } + + now = timeval_current(); + + switch (tp) { + case TEVENT_TRACE_BEFORE_WAIT: + diff = timeval_until(&tevent_after_wait_ts, &now); + if (diff.tv_sec > 3) { + DEBUG(DEBUG_ERR, + ("Handling event took %ld seconds!\n", + (long)diff.tv_sec)); + } + tevent_before_wait_ts = now; + break; + + case TEVENT_TRACE_AFTER_WAIT: + diff = timeval_until(&tevent_before_wait_ts, &now); + if (diff.tv_sec > 3) { + DEBUG(DEBUG_ERR, + ("No event for %ld seconds!\n", + (long)diff.tv_sec)); + } + tevent_after_wait_ts = now; + break; + + default: + /* Do nothing for future tevent trace points */ ; + } +} + +static void ctdb_remove_pidfile(void) +{ + TALLOC_FREE(ctdbd_pidfile_ctx); +} + +static void ctdb_create_pidfile(TALLOC_CTX *mem_ctx) +{ + if (ctdbd_pidfile != NULL) { + int ret = pidfile_context_create(mem_ctx, ctdbd_pidfile, + &ctdbd_pidfile_ctx); + if (ret != 0) { + DEBUG(DEBUG_ERR, + ("Failed to create PID file %s\n", + ctdbd_pidfile)); + exit(11); + } + + DEBUG(DEBUG_NOTICE, ("Created PID file %s\n", ctdbd_pidfile)); + atexit(ctdb_remove_pidfile); + } +} + +static void ctdb_initialise_vnn_map(struct ctdb_context *ctdb) +{ + unsigned int i, j, count; + + /* initialize the vnn mapping table, skipping any deleted nodes */ + ctdb->vnn_map = talloc(ctdb, struct ctdb_vnn_map); + CTDB_NO_MEMORY_FATAL(ctdb, ctdb->vnn_map); + + count = 0; + for (i = 0; i < ctdb->num_nodes; i++) { + if ((ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) == 0) { + count++; + } + } + + ctdb->vnn_map->generation = INVALID_GENERATION; + ctdb->vnn_map->size = count; + ctdb->vnn_map->map = talloc_array(ctdb->vnn_map, uint32_t, ctdb->vnn_map->size); + CTDB_NO_MEMORY_FATAL(ctdb, ctdb->vnn_map->map); + + for(i=0, j=0; i < ctdb->vnn_map->size; i++) { + if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) { + continue; + } + ctdb->vnn_map->map[j] = i; + j++; + } +} + +static void ctdb_set_my_pnn(struct ctdb_context *ctdb) +{ + if (ctdb->address == NULL) { + ctdb_fatal(ctdb, + "Can not determine PNN - node address is not set\n"); + } + + ctdb->pnn = ctdb_ip_to_pnn(ctdb, ctdb->address); + if (ctdb->pnn == CTDB_UNKNOWN_PNN) { + ctdb_fatal(ctdb, + "Can not determine PNN - unknown node address\n"); + } + + D_NOTICE("PNN is %u\n", ctdb->pnn); +} + +static void stdin_handler(struct tevent_context *ev, + struct tevent_fd *fde, + uint16_t flags, + void *private_data) +{ + struct ctdb_context *ctdb = talloc_get_type_abort( + private_data, struct ctdb_context); + ssize_t nread; + char c; + + nread = read(STDIN_FILENO, &c, 1); + if (nread != 1) { + D_ERR("stdin closed, exiting\n"); + talloc_free(fde); + ctdb_shutdown_sequence(ctdb, EPIPE); + } +} + +static int setup_stdin_handler(struct ctdb_context *ctdb) +{ + struct tevent_fd *fde; + struct stat st; + int ret; + + ret = fstat(STDIN_FILENO, &st); + if (ret != 0) { + /* Problem with stdin, ignore... */ + DBG_INFO("Can't fstat() stdin\n"); + return 0; + } + + if (!S_ISFIFO(st.st_mode)) { + DBG_INFO("Not a pipe...\n"); + return 0; + } + + fde = tevent_add_fd(ctdb->ev, + ctdb, + STDIN_FILENO, + TEVENT_FD_READ, + stdin_handler, + ctdb); + if (fde == NULL) { + return ENOMEM; + } + + DBG_INFO("Set up stdin handler\n"); + return 0; +} + +static void fork_only(void) +{ + pid_t pid; + + pid = fork(); + if (pid == -1) { + D_ERR("Fork failed (errno=%d)\n", errno); + exit(1); + } + + if (pid != 0) { + /* Parent simply exits... */ + exit(0); + } +} + +static void sighup_hook(void *private_data) +{ + struct ctdb_context *ctdb = talloc_get_type_abort(private_data, + struct ctdb_context); + + if (ctdb->recoverd_pid > 0) { + kill(ctdb->recoverd_pid, SIGHUP); + } + ctdb_event_reopen_logs(ctdb); +} + +/* + start the protocol going as a daemon +*/ +int ctdb_start_daemon(struct ctdb_context *ctdb, + bool interactive, + bool test_mode_enabled) +{ + bool status; + int ret; + struct tevent_fd *fde; + + /* Fork if not interactive */ + if (!interactive) { + if (test_mode_enabled) { + /* Keep stdin open */ + fork_only(); + } else { + /* Fork, close stdin, start a session */ + become_daemon(true, false, false); + } + } + + ignore_signal(SIGPIPE); + ignore_signal(SIGUSR1); + + ctdb->ctdbd_pid = getpid(); + DEBUG(DEBUG_ERR, ("Starting CTDBD (Version %s) as PID: %u\n", + SAMBA_VERSION_STRING, ctdb->ctdbd_pid)); + ctdb_create_pidfile(ctdb); + + /* create a unix domain stream socket to listen to */ + ret = ux_socket_bind(ctdb, test_mode_enabled); + if (ret != 0) { + D_ERR("Cannot continue. Exiting!\n"); + exit(10); + } + + /* Make sure we log something when the daemon terminates. + * This must be the first exit handler to run (so the last to + * be registered. + */ + __ctdbd_pid = getpid(); + atexit(print_exit_message); + + if (ctdb->do_setsched) { + /* try to set us up as realtime */ + if (!set_scheduler()) { + exit(1); + } + DEBUG(DEBUG_NOTICE, ("Set real-time scheduler priority\n")); + } + + ctdb->ev = tevent_context_init(NULL); + if (ctdb->ev == NULL) { + DEBUG(DEBUG_ALERT,("tevent_context_init() failed\n")); + exit(1); + } + tevent_loop_allow_nesting(ctdb->ev); + ctdb_tevent_trace_init(); + tevent_set_trace_callback(ctdb->ev, ctdb_tevent_trace, ctdb); + + status = logging_setup_sighup_handler(ctdb->ev, + ctdb, + sighup_hook, + ctdb); + if (!status) { + D_ERR("Failed to set up signal handler for SIGHUP\n"); + exit(1); + } + + /* set up a handler to pick up sigchld */ + if (ctdb_init_sigchld(ctdb) == NULL) { + DEBUG(DEBUG_CRIT,("Failed to set up signal handler for SIGCHLD\n")); + exit(1); + } + + if (!interactive) { + ctdb_set_child_logging(ctdb); + } + + /* Exit if stdin is closed */ + if (test_mode_enabled) { + ret = setup_stdin_handler(ctdb); + if (ret != 0) { + DBG_ERR("Failed to setup stdin handler\n"); + exit(1); + } + } + + TALLOC_FREE(ctdb->srv); + if (srvid_init(ctdb, &ctdb->srv) != 0) { + DEBUG(DEBUG_CRIT,("Failed to setup message srvid context\n")); + exit(1); + } + + TALLOC_FREE(ctdb->tunnels); + if (srvid_init(ctdb, &ctdb->tunnels) != 0) { + DEBUG(DEBUG_ERR, ("Failed to setup tunnels context\n")); + exit(1); + } + + /* initialize statistics collection */ + ctdb_statistics_init(ctdb); + + /* force initial recovery for election */ + ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + + if (ctdb_start_eventd(ctdb) != 0) { + DEBUG(DEBUG_ERR, ("Failed to start event daemon\n")); + exit(1); + } + + ctdb_set_runstate(ctdb, CTDB_RUNSTATE_INIT); + ret = ctdb_event_script(ctdb, CTDB_EVENT_INIT); + if (ret != 0) { + ctdb_die(ctdb, "Failed to run init event\n"); + } + ctdb_run_notification_script(ctdb, "init"); + + if (strcmp(ctdb->transport, "tcp") == 0) { + ret = ctdb_tcp_init(ctdb); + } +#ifdef USE_INFINIBAND + if (strcmp(ctdb->transport, "ib") == 0) { + ret = ctdb_ibw_init(ctdb); + } +#endif + if (ret != 0) { + DEBUG(DEBUG_ERR,("Failed to initialise transport '%s'\n", ctdb->transport)); + return -1; + } + + if (ctdb->methods == NULL) { + DEBUG(DEBUG_ALERT,(__location__ " Can not initialize transport. ctdb->methods is NULL\n")); + ctdb_fatal(ctdb, "transport is unavailable. can not initialize."); + } + + /* Initialise the transport. This sets the node address if it + * was not set via the command-line. */ + if (ctdb->methods->initialise(ctdb) != 0) { + ctdb_fatal(ctdb, "transport failed to initialise"); + } + + ctdb_set_my_pnn(ctdb); + + initialise_node_flags(ctdb); + + ret = ctdb_set_public_addresses(ctdb, true); + if (ret == -1) { + D_ERR("Unable to setup public IP addresses\n"); + exit(1); + } + + ctdb_initialise_vnn_map(ctdb); + + /* attach to existing databases */ + if (ctdb_attach_databases(ctdb) != 0) { + ctdb_fatal(ctdb, "Failed to attach to databases\n"); + } + + /* start frozen, then let the first election sort things out */ + if (!ctdb_blocking_freeze(ctdb)) { + ctdb_fatal(ctdb, "Failed to get initial freeze\n"); + } + + /* now start accepting clients, only can do this once frozen */ + fde = tevent_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd, TEVENT_FD_READ, + ctdb_accept_client, ctdb); + if (fde == NULL) { + ctdb_fatal(ctdb, "Failed to add daemon socket to event loop"); + } + tevent_fd_set_auto_close(fde); + + /* Start the transport */ + if (ctdb->methods->start(ctdb) != 0) { + DEBUG(DEBUG_ALERT,("transport failed to start!\n")); + ctdb_fatal(ctdb, "transport failed to start"); + } + + /* Recovery daemon and timed events are started from the + * callback, only after the setup event completes + * successfully. + */ + ctdb_set_runstate(ctdb, CTDB_RUNSTATE_SETUP); + ret = ctdb_event_script_callback(ctdb, + ctdb, + ctdb_setup_event_callback, + ctdb, + CTDB_EVENT_SETUP, + "%s", + ""); + if (ret != 0) { + DEBUG(DEBUG_CRIT,("Failed to set up 'setup' event\n")); + exit(1); + } + + lockdown_memory(ctdb->valgrinding); + + /* go into a wait loop to allow other nodes to complete */ + tevent_loop_wait(ctdb->ev); + + DEBUG(DEBUG_CRIT,("event_loop_wait() returned. this should not happen\n")); + exit(1); +} + +/* + allocate a packet for use in daemon<->daemon communication + */ +struct ctdb_req_header *_ctdb_transport_allocate(struct ctdb_context *ctdb, + TALLOC_CTX *mem_ctx, + enum ctdb_operation operation, + size_t length, size_t slength, + const char *type) +{ + int size; + struct ctdb_req_header *hdr; + + length = MAX(length, slength); + size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1); + + if (ctdb->methods == NULL) { + DEBUG(DEBUG_INFO,(__location__ " Unable to allocate transport packet for operation %u of length %u. Transport is DOWN.\n", + operation, (unsigned)length)); + return NULL; + } + + hdr = (struct ctdb_req_header *)ctdb->methods->allocate_pkt(mem_ctx, size); + if (hdr == NULL) { + DEBUG(DEBUG_ERR,("Unable to allocate transport packet for operation %u of length %u\n", + operation, (unsigned)length)); + return NULL; + } + talloc_set_name_const(hdr, type); + memset(hdr, 0, slength); + hdr->length = length; + hdr->operation = operation; + hdr->ctdb_magic = CTDB_MAGIC; + hdr->ctdb_version = CTDB_PROTOCOL; + hdr->generation = ctdb->vnn_map->generation; + hdr->srcnode = ctdb->pnn; + + return hdr; +} + +struct daemon_control_state { + struct daemon_control_state *next, *prev; + struct ctdb_client *client; + struct ctdb_req_control_old *c; + uint32_t reqid; + struct ctdb_node *node; +}; + +/* + callback when a control reply comes in + */ +static void daemon_control_callback(struct ctdb_context *ctdb, + int32_t status, TDB_DATA data, + const char *errormsg, + void *private_data) +{ + struct daemon_control_state *state = talloc_get_type(private_data, + struct daemon_control_state); + struct ctdb_client *client = state->client; + struct ctdb_reply_control_old *r; + size_t len; + int ret; + + /* construct a message to send to the client containing the data */ + len = offsetof(struct ctdb_reply_control_old, data) + data.dsize; + if (errormsg) { + len += strlen(errormsg); + } + r = ctdbd_allocate_pkt(ctdb, state, CTDB_REPLY_CONTROL, len, + struct ctdb_reply_control_old); + CTDB_NO_MEMORY_VOID(ctdb, r); + + r->hdr.reqid = state->reqid; + r->status = status; + r->datalen = data.dsize; + r->errorlen = 0; + memcpy(&r->data[0], data.dptr, data.dsize); + if (errormsg) { + r->errorlen = strlen(errormsg); + memcpy(&r->data[r->datalen], errormsg, r->errorlen); + } + + ret = daemon_queue_send(client, &r->hdr); + if (ret != -1) { + talloc_free(state); + } +} + +/* + fail all pending controls to a disconnected node + */ +void ctdb_daemon_cancel_controls(struct ctdb_context *ctdb, struct ctdb_node *node) +{ + struct daemon_control_state *state; + while ((state = node->pending_controls)) { + DLIST_REMOVE(node->pending_controls, state); + daemon_control_callback(ctdb, (uint32_t)-1, tdb_null, + "node is disconnected", state); + } +} + +/* + destroy a daemon_control_state + */ +static int daemon_control_destructor(struct daemon_control_state *state) +{ + if (state->node) { + DLIST_REMOVE(state->node->pending_controls, state); + } + return 0; +} + +/* + this is called when the ctdb daemon received a ctdb request control + from a local client over the unix domain socket + */ +static void daemon_request_control_from_client(struct ctdb_client *client, + struct ctdb_req_control_old *c) +{ + TDB_DATA data; + int res; + struct daemon_control_state *state; + TALLOC_CTX *tmp_ctx = talloc_new(client); + + if (c->hdr.destnode == CTDB_CURRENT_NODE) { + c->hdr.destnode = client->ctdb->pnn; + } + + state = talloc(client, struct daemon_control_state); + CTDB_NO_MEMORY_VOID(client->ctdb, state); + + state->client = client; + state->c = talloc_steal(state, c); + state->reqid = c->hdr.reqid; + if (ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) { + state->node = client->ctdb->nodes[c->hdr.destnode]; + DLIST_ADD(state->node->pending_controls, state); + } else { + state->node = NULL; + } + + talloc_set_destructor(state, daemon_control_destructor); + + if (c->flags & CTDB_CTRL_FLAG_NOREPLY) { + talloc_steal(tmp_ctx, state); + } + + data.dptr = &c->data[0]; + data.dsize = c->datalen; + res = ctdb_daemon_send_control(client->ctdb, c->hdr.destnode, + c->srvid, c->opcode, client->client_id, + c->flags, + data, daemon_control_callback, + state); + if (res != 0) { + DEBUG(DEBUG_ERR,(__location__ " Failed to send control to remote node %u\n", + c->hdr.destnode)); + } + + talloc_free(tmp_ctx); +} + +static void daemon_request_tunnel_from_client(struct ctdb_client *client, + struct ctdb_req_tunnel_old *c) +{ + TDB_DATA data; + int ret; + + if (! ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) { + DEBUG(DEBUG_ERR, ("Invalid destination 0x%x\n", + c->hdr.destnode)); + return; + } + + ret = srvid_exists(client->ctdb->tunnels, c->tunnel_id, NULL); + if (ret != 0) { + DEBUG(DEBUG_ERR, + ("tunnel id 0x%"PRIx64" not registered, dropping pkt\n", + c->tunnel_id)); + return; + } + + data = (TDB_DATA) { + .dsize = c->datalen, + .dptr = &c->data[0], + }; + + ret = ctdb_daemon_send_tunnel(client->ctdb, c->hdr.destnode, + c->tunnel_id, c->flags, data); + if (ret != 0) { + DEBUG(DEBUG_ERR, ("Failed to set tunnel to remote note %u\n", + c->hdr.destnode)); + } +} + +/* + register a call function +*/ +int ctdb_daemon_set_call(struct ctdb_context *ctdb, uint32_t db_id, + ctdb_fn_t fn, int id) +{ + struct ctdb_registered_call *call; + struct ctdb_db_context *ctdb_db; + + ctdb_db = find_ctdb_db(ctdb, db_id); + if (ctdb_db == NULL) { + return -1; + } + + call = talloc(ctdb_db, struct ctdb_registered_call); + call->fn = fn; + call->id = id; + + DLIST_ADD(ctdb_db->calls, call); + return 0; +} + + + +/* + this local messaging handler is ugly, but is needed to prevent + recursion in ctdb_send_message() when the destination node is the + same as the source node + */ +struct ctdb_local_message { + struct ctdb_context *ctdb; + uint64_t srvid; + TDB_DATA data; +}; + +static void ctdb_local_message_trigger(struct tevent_context *ev, + struct tevent_timer *te, + struct timeval t, void *private_data) +{ + struct ctdb_local_message *m = talloc_get_type( + private_data, struct ctdb_local_message); + + srvid_dispatch(m->ctdb->srv, m->srvid, CTDB_SRVID_ALL, m->data); + talloc_free(m); +} + +static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data) +{ + struct ctdb_local_message *m; + m = talloc(ctdb, struct ctdb_local_message); + CTDB_NO_MEMORY(ctdb, m); + + m->ctdb = ctdb; + m->srvid = srvid; + m->data = data; + m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize); + if (m->data.dptr == NULL) { + talloc_free(m); + return -1; + } + + /* this needs to be done as an event to prevent recursion */ + tevent_add_timer(ctdb->ev, m, timeval_zero(), + ctdb_local_message_trigger, m); + return 0; +} + +/* + send a ctdb message +*/ +int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t pnn, + uint64_t srvid, TDB_DATA data) +{ + struct ctdb_req_message_old *r; + int len; + + if (ctdb->methods == NULL) { + DEBUG(DEBUG_INFO,(__location__ " Failed to send message. Transport is DOWN\n")); + return -1; + } + + /* see if this is a message to ourselves */ + if (pnn == ctdb->pnn) { + return ctdb_local_message(ctdb, srvid, data); + } + + len = offsetof(struct ctdb_req_message_old, data) + data.dsize; + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len, + struct ctdb_req_message_old); + CTDB_NO_MEMORY(ctdb, r); + + r->hdr.destnode = pnn; + r->srvid = srvid; + r->datalen = data.dsize; + memcpy(&r->data[0], data.dptr, data.dsize); + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); + return 0; +} + + + +struct ctdb_client_notify_list { + struct ctdb_client_notify_list *next, *prev; + struct ctdb_context *ctdb; + uint64_t srvid; + TDB_DATA data; +}; + + +static int ctdb_client_notify_destructor(struct ctdb_client_notify_list *nl) +{ + int ret; + + DEBUG(DEBUG_ERR,("Sending client notify message for srvid:%llu\n", (unsigned long long)nl->srvid)); + + ret = ctdb_daemon_send_message(nl->ctdb, CTDB_BROADCAST_CONNECTED, (unsigned long long)nl->srvid, nl->data); + if (ret != 0) { + DEBUG(DEBUG_ERR,("Failed to send client notify message\n")); + } + + return 0; +} + +int32_t ctdb_control_register_notify(struct ctdb_context *ctdb, uint32_t client_id, TDB_DATA indata) +{ + struct ctdb_notify_data_old *notify = (struct ctdb_notify_data_old *)indata.dptr; + struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client); + struct ctdb_client_notify_list *nl; + + DEBUG(DEBUG_INFO,("Register srvid %llu for client %d\n", (unsigned long long)notify->srvid, client_id)); + + if (indata.dsize < offsetof(struct ctdb_notify_data_old, notify_data)) { + DEBUG(DEBUG_ERR,(__location__ " Too little data in control : %d\n", (int)indata.dsize)); + return -1; + } + + if (indata.dsize != (notify->len + offsetof(struct ctdb_notify_data_old, notify_data))) { + DEBUG(DEBUG_ERR,(__location__ " Wrong amount of data in control. Got %d, expected %d\n", (int)indata.dsize, (int)(notify->len + offsetof(struct ctdb_notify_data_old, notify_data)))); + return -1; + } + + + if (client == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Could not find client parent structure. You can not send this control to a remote node\n")); + return -1; + } + + for(nl=client->notify; nl; nl=nl->next) { + if (nl->srvid == notify->srvid) { + break; + } + } + if (nl != NULL) { + DEBUG(DEBUG_ERR,(__location__ " Notification for srvid:%llu already exists for this client\n", (unsigned long long)notify->srvid)); + return -1; + } + + nl = talloc(client, struct ctdb_client_notify_list); + CTDB_NO_MEMORY(ctdb, nl); + nl->ctdb = ctdb; + nl->srvid = notify->srvid; + nl->data.dsize = notify->len; + nl->data.dptr = talloc_memdup(nl, notify->notify_data, + nl->data.dsize); + CTDB_NO_MEMORY(ctdb, nl->data.dptr); + + DLIST_ADD(client->notify, nl); + talloc_set_destructor(nl, ctdb_client_notify_destructor); + + return 0; +} + +int32_t ctdb_control_deregister_notify(struct ctdb_context *ctdb, uint32_t client_id, TDB_DATA indata) +{ + uint64_t srvid = *(uint64_t *)indata.dptr; + struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client); + struct ctdb_client_notify_list *nl; + + DEBUG(DEBUG_INFO,("Deregister srvid %llu for client %d\n", (unsigned long long)srvid, client_id)); + + if (client == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Could not find client parent structure. You can not send this control to a remote node\n")); + return -1; + } + + for(nl=client->notify; nl; nl=nl->next) { + if (nl->srvid == srvid) { + break; + } + } + if (nl == NULL) { + DEBUG(DEBUG_ERR,(__location__ " No notification for srvid:%llu found for this client\n", (unsigned long long)srvid)); + return -1; + } + + DLIST_REMOVE(client->notify, nl); + talloc_set_destructor(nl, NULL); + talloc_free(nl); + + return 0; +} + +struct ctdb_client *ctdb_find_client_by_pid(struct ctdb_context *ctdb, pid_t pid) +{ + struct ctdb_client_pid_list *client_pid; + + for (client_pid = ctdb->client_pids; client_pid; client_pid=client_pid->next) { + if (client_pid->pid == pid) { + return client_pid->client; + } + } + return NULL; +} + + +/* This control is used by samba when probing if a process (of a samba daemon) + exists on the node. + Samba does this when it needs/wants to check if a subrecord in one of the + databases is still valid, or if it is stale and can be removed. + If the node is in unhealthy or stopped state we just kill of the samba + process holding this sub-record and return to the calling samba that + the process does not exist. + This allows us to forcefully recall subrecords registered by samba processes + on banned and stopped nodes. +*/ +int32_t ctdb_control_process_exists(struct ctdb_context *ctdb, pid_t pid) +{ + struct ctdb_client *client; + + client = ctdb_find_client_by_pid(ctdb, pid); + if (client == NULL) { + return -1; + } + + if (ctdb->nodes[ctdb->pnn]->flags & NODE_FLAGS_INACTIVE) { + DEBUG(DEBUG_NOTICE, + ("Killing client with pid:%d on banned/stopped node\n", + (int)pid)); + talloc_free(client); + return -1; + } + + return kill(pid, 0); +} + +int32_t ctdb_control_check_pid_srvid(struct ctdb_context *ctdb, + TDB_DATA indata) +{ + struct ctdb_client_pid_list *client_pid; + pid_t pid; + uint64_t srvid; + int ret; + + pid = *(pid_t *)indata.dptr; + srvid = *(uint64_t *)(indata.dptr + sizeof(pid_t)); + + for (client_pid = ctdb->client_pids; + client_pid != NULL; + client_pid = client_pid->next) { + if (client_pid->pid == pid) { + ret = srvid_exists(ctdb->srv, srvid, + client_pid->client); + if (ret == 0) { + return 0; + } + } + } + + return -1; +} + +int ctdb_control_getnodesfile(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata) +{ + struct ctdb_node_map_old *node_map = NULL; + + CHECK_CONTROL_DATA_SIZE(0); + + node_map = ctdb_read_nodes_file(ctdb, ctdb->nodes_file); + if (node_map == NULL) { + DEBUG(DEBUG_ERR, ("Failed to read nodes file\n")); + return -1; + } + + outdata->dptr = (unsigned char *)node_map; + outdata->dsize = talloc_get_size(outdata->dptr); + + return 0; +} + +void ctdb_shutdown_sequence(struct ctdb_context *ctdb, int exit_code) +{ + if (ctdb->runstate == CTDB_RUNSTATE_SHUTDOWN) { + DEBUG(DEBUG_NOTICE,("Already shutting down so will not proceed.\n")); + return; + } + + DEBUG(DEBUG_ERR,("Shutdown sequence commencing.\n")); + ctdb_set_runstate(ctdb, CTDB_RUNSTATE_SHUTDOWN); + ctdb_stop_recoverd(ctdb); + ctdb_stop_keepalive(ctdb); + ctdb_stop_monitoring(ctdb); + ctdb_event_script(ctdb, CTDB_EVENT_SHUTDOWN); + ctdb_stop_eventd(ctdb); + if (ctdb->methods != NULL && ctdb->methods->shutdown != NULL) { + ctdb->methods->shutdown(ctdb); + } + + DEBUG(DEBUG_ERR,("Shutdown sequence complete, exiting.\n")); + exit(exit_code); +} + +/* When forking the main daemon and the child process needs to connect + * back to the daemon as a client process, this function can be used + * to change the ctdb context from daemon into client mode. The child + * process must be created using ctdb_fork() and not fork() - + * ctdb_fork() does some necessary housekeeping. + */ +int switch_from_server_to_client(struct ctdb_context *ctdb) +{ + int ret; + + if (ctdb->daemon.sd != -1) { + close(ctdb->daemon.sd); + ctdb->daemon.sd = -1; + } + + /* get a new event context */ + ctdb->ev = tevent_context_init(ctdb); + if (ctdb->ev == NULL) { + DEBUG(DEBUG_ALERT,("tevent_context_init() failed\n")); + exit(1); + } + tevent_loop_allow_nesting(ctdb->ev); + + /* Connect to main CTDB daemon */ + ret = ctdb_socket_connect(ctdb); + if (ret != 0) { + DEBUG(DEBUG_ALERT, (__location__ " Failed to init ctdb client\n")); + return -1; + } + + ctdb->can_send_controls = true; + + return 0; +} |