/* Unix SMB/CIFS implementation. Samba internal messaging functions Copyright (C) 2007 by Volker Lendecke 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 . */ #include "includes.h" #include "messages.h" #include "util_tdb.h" #include "lib/util/iov_buf.h" #include "lib/messages_util.h" #include "ctdbd_conn.h" #include "lib/cluster_support.h" struct messaging_ctdbd_context { struct ctdbd_connection *conn; }; /* * This is a Samba3 hack/optimization. Routines like process_exists need to * talk to ctdbd, and they don't get handed a messaging context. */ static struct ctdbd_connection *global_ctdbd_connection; static int global_ctdb_connection_pid; struct ctdbd_connection *messaging_ctdbd_connection(void) { if (!lp_clustering()) { return NULL; } if (global_ctdb_connection_pid == 0 && global_ctdbd_connection == NULL) { struct tevent_context *ev; struct messaging_context *msg; ev = samba_tevent_context_init(NULL); if (!ev) { DEBUG(0,("samba_tevent_context_init failed\n")); return NULL; } msg = messaging_init(NULL, ev); if (!msg) { DEBUG(0,("messaging_init failed\n")); return NULL; } } if (global_ctdb_connection_pid != getpid()) { DEBUG(0,("messaging_ctdbd_connection():" "valid for pid[%jd] but it's [%jd]\n", (intmax_t)global_ctdb_connection_pid, (intmax_t)getpid())); smb_panic("messaging_ctdbd_connection() invalid process\n"); } return global_ctdbd_connection; } static int messaging_ctdb_send(struct server_id src, struct server_id pid, int msg_type, const struct iovec *iov, int iovlen, const int *fds, size_t num_fds, struct messaging_backend *backend) { struct messaging_ctdbd_context *ctx = talloc_get_type_abort( backend->private_data, struct messaging_ctdbd_context); uint8_t hdr[MESSAGE_HDR_LENGTH]; struct iovec iov2[iovlen+1]; if (num_fds > 0) { return ENOSYS; } message_hdr_put(hdr, msg_type, src, pid); iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) }; memcpy(&iov2[1], iov, iovlen * sizeof(*iov)); return ctdbd_messaging_send_iov(ctx->conn, pid.vnn, pid.pid, iov2, iovlen+1); } static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx) { /* * The global connection just went away */ global_ctdb_connection_pid = 0; global_ctdbd_connection = NULL; return 0; } static int messaging_ctdb_recv( uint32_t src_vnn, uint32_t dst_vnn, uint64_t dst_srvid, const uint8_t *msg, size_t msg_len, void *private_data) { struct messaging_context *msg_ctx = talloc_get_type_abort( private_data, struct messaging_context); struct server_id me = messaging_server_id(msg_ctx); NTSTATUS status; struct iovec iov; struct server_id src, dst; enum messaging_type msg_type; struct server_id_buf idbuf; if (msg_len < MESSAGE_HDR_LENGTH) { DEBUG(1, ("%s: message too short: %u\n", __func__, (unsigned)msg_len)); return 0; } message_hdr_get(&msg_type, &src, &dst, msg); iov = (struct iovec) { .iov_base = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH, .iov_len = msg_len - MESSAGE_HDR_LENGTH }; DEBUG(10, ("%s: Received message 0x%x len %u from %s\n", __func__, (unsigned)msg_type, (unsigned)msg_len, server_id_str_buf(src, &idbuf))); if (!server_id_same_process(&me, &dst)) { struct server_id_buf id1, id2; DEBUG(10, ("%s: I'm %s, ignoring msg to %s\n", __func__, server_id_str_buf(me, &id1), server_id_str_buf(dst, &id2))); return 0; } /* * Go through the event loop */ status = messaging_send_iov_from(msg_ctx, src, dst, msg_type, &iov, 1, NULL, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("%s: messaging_send_iov_from failed: %s\n", __func__, nt_errstr(status))); } return 0; } int messaging_ctdbd_init(struct messaging_context *msg_ctx, TALLOC_CTX *mem_ctx, struct messaging_backend **presult) { struct messaging_backend *result; struct messaging_ctdbd_context *ctx; int ret; if (!(result = talloc(mem_ctx, struct messaging_backend))) { DEBUG(0, ("talloc failed\n")); return ENOMEM; } if (!(ctx = talloc(result, struct messaging_ctdbd_context))) { DEBUG(0, ("talloc failed\n")); TALLOC_FREE(result); return ENOMEM; } ret = ctdbd_messaging_connection(ctx, lp_ctdbd_socket(), lp_ctdb_timeout(), &ctx->conn); if (ret != 0) { DEBUG(10, ("ctdbd_messaging_connection failed: %s\n", strerror(ret))); TALLOC_FREE(result); return ret; } ret = ctdbd_register_msg_ctx(ctx->conn, msg_ctx, messaging_tevent_context(msg_ctx)); if (ret != 0) { DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n", strerror(ret))); TALLOC_FREE(result); return ret; } ret = register_with_ctdbd(ctx->conn, getpid(), messaging_ctdb_recv, msg_ctx); if (ret != 0) { DEBUG(10, ("register_with_ctdbd failed: %s\n", strerror(ret))); TALLOC_FREE(result); return ret; } global_ctdb_connection_pid = getpid(); global_ctdbd_connection = ctx->conn; talloc_set_destructor(ctx, messaging_ctdbd_destructor); set_my_vnn(ctdbd_vnn(ctx->conn)); result->send_fn = messaging_ctdb_send; result->private_data = (void *)ctx; *presult = result; return 0; }