diff options
Diffstat (limited to 'source4/cluster/ctdb/server/ctdb_control.c')
| -rw-r--r-- | source4/cluster/ctdb/server/ctdb_control.c | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/source4/cluster/ctdb/server/ctdb_control.c b/source4/cluster/ctdb/server/ctdb_control.c new file mode 100644 index 0000000000..69848bb15c --- /dev/null +++ b/source4/cluster/ctdb/server/ctdb_control.c @@ -0,0 +1,499 @@ +/* + ctdb_control protocol code + + Copyright (C) Andrew Tridgell 2007 + + 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 "includes.h" +#include "lib/events/events.h" +#include "lib/tdb/include/tdb.h" +#include "system/network.h" +#include "system/filesys.h" +#include "system/wait.h" +#include "../include/ctdb_private.h" +#include "lib/util/dlinklist.h" +#include "db_wrap.h" + +struct ctdb_control_state { + struct ctdb_context *ctdb; + uint32_t reqid; + ctdb_control_callback_fn_t callback; + void *private_data; + unsigned flags; +}; + +/* + process a control request + */ +static int32_t ctdb_control_dispatch(struct ctdb_context *ctdb, + struct ctdb_req_control *c, + TDB_DATA indata, + TDB_DATA *outdata, uint32_t srcnode, + const char **errormsg, + bool *async_reply) +{ + uint32_t opcode = c->opcode; + uint64_t srvid = c->srvid; + uint32_t client_id = c->client_id; + + switch (opcode) { + case CTDB_CONTROL_PROCESS_EXISTS: { + CHECK_CONTROL_DATA_SIZE(sizeof(pid_t)); + return kill(*(pid_t *)indata.dptr, 0); + } + + case CTDB_CONTROL_SET_DEBUG: { + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + LogLevel = *(uint32_t *)indata.dptr; + return 0; + } + + case CTDB_CONTROL_GET_DEBUG: { + CHECK_CONTROL_DATA_SIZE(0); + outdata->dptr = (uint8_t *)&LogLevel; + outdata->dsize = sizeof(LogLevel); + return 0; + } + + case CTDB_CONTROL_STATISTICS: { + CHECK_CONTROL_DATA_SIZE(0); + ctdb->statistics.memory_used = talloc_total_size(ctdb); + ctdb->statistics.frozen = (ctdb->freeze_mode == CTDB_FREEZE_FROZEN); + ctdb->statistics.recovering = (ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE); + outdata->dptr = (uint8_t *)&ctdb->statistics; + outdata->dsize = sizeof(ctdb->statistics); + return 0; + } + + case CTDB_CONTROL_GET_ALL_TUNABLES: { + CHECK_CONTROL_DATA_SIZE(0); + outdata->dptr = (uint8_t *)&ctdb->tunable; + outdata->dsize = sizeof(ctdb->tunable); + return 0; + } + + case CTDB_CONTROL_DUMP_MEMORY: { + CHECK_CONTROL_DATA_SIZE(0); + talloc_report_full(ctdb, stdout); + return 0; + } + + case CTDB_CONTROL_STATISTICS_RESET: { + CHECK_CONTROL_DATA_SIZE(0); + ZERO_STRUCT(ctdb->statistics); + return 0; + } + + case CTDB_CONTROL_GETVNNMAP: + return ctdb_control_getvnnmap(ctdb, opcode, indata, outdata); + + case CTDB_CONTROL_GET_DBMAP: + return ctdb_control_getdbmap(ctdb, opcode, indata, outdata); + + case CTDB_CONTROL_GET_NODEMAP: + return ctdb_control_getnodemap(ctdb, opcode, indata, outdata); + + case CTDB_CONTROL_SETVNNMAP: + return ctdb_control_setvnnmap(ctdb, opcode, indata, outdata); + + case CTDB_CONTROL_PULL_DB: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_pulldb)); + return ctdb_control_pull_db(ctdb, indata, outdata); + + case CTDB_CONTROL_SET_DMASTER: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_set_dmaster)); + return ctdb_control_set_dmaster(ctdb, indata); + + case CTDB_CONTROL_PUSH_DB: + return ctdb_control_push_db(ctdb, indata); + + case CTDB_CONTROL_GET_RECMODE: { + return ctdb->recovery_mode; + } + + case CTDB_CONTROL_SET_RECMASTER: { + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + if (ctdb->freeze_mode != CTDB_FREEZE_FROZEN) { + DEBUG(0,("Attempt to set recmaster when not frozen\n")); + return -1; + } + ctdb->recovery_master = ((uint32_t *)(&indata.dptr[0]))[0]; + return 0; + } + + case CTDB_CONTROL_GET_RECMASTER: + return ctdb->recovery_master; + + case CTDB_CONTROL_GET_PID: + return getpid(); + + case CTDB_CONTROL_GET_VNN: + return ctdb->vnn; + + case CTDB_CONTROL_PING: + CHECK_CONTROL_DATA_SIZE(0); + return ctdb->statistics.num_clients; + + case CTDB_CONTROL_GET_DBNAME: { + uint32_t db_id; + struct ctdb_db_context *ctdb_db; + + CHECK_CONTROL_DATA_SIZE(sizeof(db_id)); + db_id = *(uint32_t *)indata.dptr; + ctdb_db = find_ctdb_db(ctdb, db_id); + if (ctdb_db == NULL) return -1; + outdata->dptr = discard_const(ctdb_db->db_name); + outdata->dsize = strlen(ctdb_db->db_name)+1; + return 0; + } + + case CTDB_CONTROL_GETDBPATH: { + uint32_t db_id; + struct ctdb_db_context *ctdb_db; + + CHECK_CONTROL_DATA_SIZE(sizeof(db_id)); + db_id = *(uint32_t *)indata.dptr; + ctdb_db = find_ctdb_db(ctdb, db_id); + if (ctdb_db == NULL) return -1; + outdata->dptr = discard_const(ctdb_db->db_path); + outdata->dsize = strlen(ctdb_db->db_path)+1; + return 0; + } + + case CTDB_CONTROL_DB_ATTACH: + return ctdb_control_db_attach(ctdb, indata, outdata); + + case CTDB_CONTROL_SET_CALL: { + struct ctdb_control_set_call *sc = + (struct ctdb_control_set_call *)indata.dptr; + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_set_call)); + return ctdb_daemon_set_call(ctdb, sc->db_id, sc->fn, sc->id); + } + + case CTDB_CONTROL_TRAVERSE_START: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_traverse_start)); + return ctdb_control_traverse_start(ctdb, indata, outdata, srcnode); + + case CTDB_CONTROL_TRAVERSE_ALL: + return ctdb_control_traverse_all(ctdb, indata, outdata); + + case CTDB_CONTROL_TRAVERSE_DATA: + return ctdb_control_traverse_data(ctdb, indata, outdata); + + case CTDB_CONTROL_REGISTER_SRVID: + return daemon_register_message_handler(ctdb, client_id, srvid); + + case CTDB_CONTROL_DEREGISTER_SRVID: + return daemon_deregister_message_handler(ctdb, client_id, srvid); + + case CTDB_CONTROL_ENABLE_SEQNUM: + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + return ctdb_ltdb_enable_seqnum(ctdb, *(uint32_t *)indata.dptr); + + case CTDB_CONTROL_UPDATE_SEQNUM: + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + return ctdb_ltdb_update_seqnum(ctdb, *(uint32_t *)indata.dptr, srcnode); + + case CTDB_CONTROL_FREEZE: + CHECK_CONTROL_DATA_SIZE(0); + return ctdb_control_freeze(ctdb, c, async_reply); + + case CTDB_CONTROL_THAW: + CHECK_CONTROL_DATA_SIZE(0); + return ctdb_control_thaw(ctdb); + + case CTDB_CONTROL_SET_RECMODE: + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + return ctdb_control_set_recmode(ctdb, c, indata, async_reply, errormsg); + + case CTDB_CONTROL_SET_MONMODE: + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + ctdb->monitoring_mode = *(uint32_t *)indata.dptr; + return 0; + + case CTDB_CONTROL_GET_MONMODE: + return ctdb->monitoring_mode; + + case CTDB_CONTROL_SHUTDOWN: + ctdb_release_all_ips(ctdb); + ctdb->methods->shutdown(ctdb); + ctdb_event_script(ctdb, "shutdown"); + DEBUG(0,("shutting down\n")); + exit(0); + + case CTDB_CONTROL_MAX_RSN: + CHECK_CONTROL_DATA_SIZE(sizeof(uint32_t)); + return ctdb_control_max_rsn(ctdb, indata, outdata); + + case CTDB_CONTROL_SET_RSN_NONEMPTY: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_set_rsn_nonempty)); + return ctdb_control_set_rsn_nonempty(ctdb, indata, outdata); + + case CTDB_CONTROL_TAKEOVER_IP: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_public_ip)); + return ctdb_control_takeover_ip(ctdb, c, indata, async_reply); + + case CTDB_CONTROL_RELEASE_IP: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_public_ip)); + return ctdb_control_release_ip(ctdb, c, indata, async_reply); + + case CTDB_CONTROL_GET_PUBLIC_IPS: + CHECK_CONTROL_DATA_SIZE(0); + return ctdb_control_get_public_ips(ctdb, c, outdata); + + case CTDB_CONTROL_DELETE_LOW_RSN: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_delete_low_rsn)); + return ctdb_control_delete_low_rsn(ctdb, indata, outdata); + + case CTDB_CONTROL_TCP_CLIENT: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_tcp)); + return ctdb_control_tcp_client(ctdb, client_id, srcnode, indata); + + case CTDB_CONTROL_STARTUP: + CHECK_CONTROL_DATA_SIZE(0); + return ctdb_control_startup(ctdb, srcnode); + + case CTDB_CONTROL_TCP_ADD: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_tcp_vnn)); + return ctdb_control_tcp_add(ctdb, indata); + + case CTDB_CONTROL_TCP_REMOVE: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_control_tcp_vnn)); + return ctdb_control_tcp_remove(ctdb, indata); + + case CTDB_CONTROL_SET_TUNABLE: + return ctdb_control_set_tunable(ctdb, indata); + + case CTDB_CONTROL_GET_TUNABLE: + return ctdb_control_get_tunable(ctdb, indata, outdata); + + case CTDB_CONTROL_LIST_TUNABLES: + return ctdb_control_list_tunables(ctdb, outdata); + + case CTDB_CONTROL_MODIFY_FLAGS: + CHECK_CONTROL_DATA_SIZE(sizeof(struct ctdb_node_modflags)); + return ctdb_control_modflags(ctdb, indata); + + default: + DEBUG(0,(__location__ " Unknown CTDB control opcode %u\n", opcode)); + return -1; + } +} + + +/* + send a reply for a ctdb control + */ +void ctdb_request_control_reply(struct ctdb_context *ctdb, struct ctdb_req_control *c, + TDB_DATA *outdata, int32_t status, const char *errormsg) +{ + struct ctdb_reply_control *r; + size_t len; + + /* some controls send no reply */ + if (c->flags & CTDB_CTRL_FLAG_NOREPLY) { + return; + } + + len = offsetof(struct ctdb_reply_control, data) + (outdata?outdata->dsize:0); + if (errormsg) { + len += strlen(errormsg); + } + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REPLY_CONTROL, len, struct ctdb_reply_control); + CTDB_NO_MEMORY_VOID(ctdb, r); + + r->hdr.destnode = c->hdr.srcnode; + r->hdr.reqid = c->hdr.reqid; + r->status = status; + r->datalen = outdata?outdata->dsize:0; + if (outdata && outdata->dsize) { + memcpy(&r->data[0], outdata->dptr, outdata->dsize); + } + if (errormsg) { + r->errorlen = strlen(errormsg); + memcpy(&r->data[r->datalen], errormsg, r->errorlen); + } + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); +} + +/* + called when a CTDB_REQ_CONTROL packet comes in +*/ +void ctdb_request_control(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) +{ + struct ctdb_req_control *c = (struct ctdb_req_control *)hdr; + TDB_DATA data, *outdata; + int32_t status; + bool async_reply = False; + const char *errormsg = NULL; + + data.dptr = &c->data[0]; + data.dsize = c->datalen; + + outdata = talloc_zero(c, TDB_DATA); + + status = ctdb_control_dispatch(ctdb, c, data, outdata, hdr->srcnode, + &errormsg, &async_reply); + + if (!async_reply) { + ctdb_request_control_reply(ctdb, c, outdata, status, errormsg); + } +} + +/* + called when a CTDB_REPLY_CONTROL packet comes in +*/ +void ctdb_reply_control(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) +{ + struct ctdb_reply_control *c = (struct ctdb_reply_control *)hdr; + TDB_DATA data; + struct ctdb_control_state *state; + const char *errormsg = NULL; + + state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_control_state); + if (state == NULL) { + DEBUG(0,("vnn %u Invalid reqid %u in ctdb_reply_control\n", + ctdb->vnn, hdr->reqid)); + return; + } + + if (hdr->reqid != state->reqid) { + /* we found a record but it was the wrong one */ + DEBUG(0, ("Dropped orphaned control reply with reqid:%u\n", hdr->reqid)); + return; + } + + data.dptr = &c->data[0]; + data.dsize = c->datalen; + if (c->errorlen) { + errormsg = talloc_strndup(state, + (char *)&c->data[c->datalen], c->errorlen); + } + + /* make state a child of the packet, so it goes away when the packet + is freed. */ + talloc_steal(hdr, state); + + state->callback(ctdb, c->status, data, errormsg, state->private_data); +} + +static int ctdb_control_destructor(struct ctdb_control_state *state) +{ + ctdb_reqid_remove(state->ctdb, state->reqid); + return 0; +} + +/* + handle a timeout of a control + */ +static void ctdb_control_timeout(struct event_context *ev, struct timed_event *te, + struct timeval t, void *private_data) +{ + struct ctdb_control_state *state = talloc_get_type(private_data, struct ctdb_control_state); + TALLOC_CTX *tmp_ctx = talloc_new(ev); + + state->ctdb->statistics.timeouts.control++; + + talloc_steal(tmp_ctx, state); + + state->callback(state->ctdb, -1, tdb_null, + "ctdb_control timed out", + state->private_data); + talloc_free(tmp_ctx); +} + + +/* + send a control message to a node + */ +int ctdb_daemon_send_control(struct ctdb_context *ctdb, uint32_t destnode, + uint64_t srvid, uint32_t opcode, uint32_t client_id, + uint32_t flags, + TDB_DATA data, + ctdb_control_callback_fn_t callback, + void *private_data) +{ + struct ctdb_req_control *c; + struct ctdb_control_state *state; + size_t len; + + if (((destnode == CTDB_BROADCAST_VNNMAP) || + (destnode == CTDB_BROADCAST_ALL) || + (destnode == CTDB_BROADCAST_CONNECTED)) && + !(flags & CTDB_CTRL_FLAG_NOREPLY)) { + DEBUG(0,("Attempt to broadcast control without NOREPLY\n")); + return -1; + } + + if (destnode != CTDB_BROADCAST_VNNMAP && + destnode != CTDB_BROADCAST_ALL && + destnode != CTDB_BROADCAST_CONNECTED && + (!ctdb_validate_vnn(ctdb, destnode) || + (ctdb->nodes[destnode]->flags & NODE_FLAGS_DISCONNECTED))) { + if (!(flags & CTDB_CTRL_FLAG_NOREPLY)) { + callback(ctdb, -1, tdb_null, "ctdb_control to disconnected node", private_data); + } + return 0; + } + + /* the state is made a child of private_data if possible. This means any reply + will be discarded if the private_data goes away */ + state = talloc(private_data?private_data:ctdb, struct ctdb_control_state); + CTDB_NO_MEMORY(ctdb, state); + + state->reqid = ctdb_reqid_new(ctdb, state); + state->callback = callback; + state->private_data = private_data; + state->ctdb = ctdb; + state->flags = flags; + + talloc_set_destructor(state, ctdb_control_destructor); + + len = offsetof(struct ctdb_req_control, data) + data.dsize; + c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CONTROL, len, + struct ctdb_req_control); + CTDB_NO_MEMORY(ctdb, c); + talloc_set_name_const(c, "ctdb_req_control packet"); + + c->hdr.destnode = destnode; + c->hdr.reqid = state->reqid; + c->opcode = opcode; + c->client_id = client_id; + c->flags = flags; + c->srvid = srvid; + c->datalen = data.dsize; + if (data.dsize) { + memcpy(&c->data[0], data.dptr, data.dsize); + } + + ctdb_queue_packet(ctdb, &c->hdr); + + if (flags & CTDB_CTRL_FLAG_NOREPLY) { + talloc_free(state); + return 0; + } + + if (ctdb->tunable.control_timeout) { + event_add_timed(ctdb->ev, state, + timeval_current_ofs(ctdb->tunable.control_timeout, 0), + ctdb_control_timeout, state); + } + + talloc_free(c); + return 0; +} |