diff options
Diffstat (limited to 'source4/lib/messaging/messaging.c')
| -rw-r--r-- | source4/lib/messaging/messaging.c | 1485 |
1 files changed, 1485 insertions, 0 deletions
diff --git a/source4/lib/messaging/messaging.c b/source4/lib/messaging/messaging.c new file mode 100644 index 0000000..67b0366 --- /dev/null +++ b/source4/lib/messaging/messaging.c @@ -0,0 +1,1485 @@ +/* + Unix SMB/CIFS implementation. + + Samba internal messaging functions + + Copyright (C) Andrew Tridgell 2004 + + 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/util/server_id.h" +#include "system/filesys.h" +#include "messaging/messaging.h" +#include "messaging/messaging_internal.h" +#include "../lib/util/dlinklist.h" +#include "lib/socket/socket.h" +#include "librpc/gen_ndr/ndr_irpc.h" +#include "lib/messaging/irpc.h" +#include "../lib/util/unix_privs.h" +#include "librpc/rpc/dcerpc.h" +#include "cluster/cluster.h" +#include "../lib/util/tevent_ntstatus.h" +#include "lib/param/param.h" +#include "lib/util/server_id_db.h" +#include "lib/util/talloc_report_printf.h" +#include "lib/messaging/messages_dgm.h" +#include "lib/messaging/messages_dgm_ref.h" +#include "../source3/lib/messages_util.h" +#include <tdb.h> + +/* change the message version with any incompatible changes in the protocol */ +#define IMESSAGING_VERSION 1 + +/* + a pending irpc call +*/ +struct irpc_request { + struct irpc_request *prev, *next; + struct imessaging_context *msg_ctx; + int callid; + struct { + void (*handler)(struct irpc_request *irpc, struct irpc_message *m); + void *private_data; + } incoming; +}; + +/* we have a linked list of dispatch handlers for each msg_type that + this messaging server can deal with */ +struct dispatch_fn { + struct dispatch_fn *next, *prev; + uint32_t msg_type; + void *private_data; + msg_callback_t fn; +}; + +/* an individual message */ + +static void irpc_handler(struct imessaging_context *, + void *, + uint32_t, + struct server_id, + size_t, + int *, + DATA_BLOB *); + + +/* + A useful function for testing the message system. +*/ +static void ping_message(struct imessaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *data) +{ + struct server_id_buf idbuf; + + if (num_fds != 0) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + DEBUG(1,("INFO: Received PING message from server %s [%.*s]\n", + server_id_str_buf(src, &idbuf), (int)data->length, + data->data?(const char *)data->data:"")); + imessaging_send(msg, src, MSG_PONG, data); +} + +static void pool_message(struct imessaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *data) +{ + FILE *f = NULL; + + if (num_fds != 1) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + f = fdopen(fds[0], "w"); + if (f == NULL) { + DBG_DEBUG("fopen failed: %s\n", strerror(errno)); + return; + } + + talloc_full_report_printf(NULL, f); + fclose(f); +} + +static void ringbuf_log_msg(struct imessaging_context *msg, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *data) +{ + char *log = debug_get_ringbuf(); + size_t logsize = debug_get_ringbuf_size(); + DATA_BLOB blob; + + if (num_fds != 0) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + if (log == NULL) { + log = discard_const_p(char, "*disabled*\n"); + logsize = strlen(log) + 1; + } + + blob.data = (uint8_t *)log; + blob.length = logsize; + + imessaging_send(msg, src, MSG_RINGBUF_LOG, &blob); +} + +/**************************************************************************** + Receive a "set debug level" message. +****************************************************************************/ + +static void debug_imessage(struct imessaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *data) +{ + const char *params_str = (const char *)data->data; + struct server_id_buf src_buf; + struct server_id dst = imessaging_get_server_id(msg_ctx); + struct server_id_buf dst_buf; + + if (num_fds != 0) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + /* Check, it's a proper string! */ + if (params_str[(data->length)-1] != '\0') { + DBG_ERR("Invalid debug message from pid %s to pid %s\n", + server_id_str_buf(src, &src_buf), + server_id_str_buf(dst, &dst_buf)); + return; + } + + DBG_ERR("INFO: Remote set of debug to `%s' (pid %s from pid %s)\n", + params_str, + server_id_str_buf(dst, &dst_buf), + server_id_str_buf(src, &src_buf)); + + debug_parse_levels(params_str); +} + +/**************************************************************************** + Return current debug level. +****************************************************************************/ + +static void debuglevel_imessage(struct imessaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *data) +{ + char *message = debug_list_class_names_and_levels(); + DATA_BLOB blob = data_blob_null; + struct server_id_buf src_buf; + struct server_id dst = imessaging_get_server_id(msg_ctx); + struct server_id_buf dst_buf; + + if (num_fds != 0) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + DBG_DEBUG("Received REQ_DEBUGLEVEL message (pid %s from pid %s)\n", + server_id_str_buf(dst, &dst_buf), + server_id_str_buf(src, &src_buf)); + + if (message == NULL) { + DBG_ERR("debug_list_class_names_and_levels returned NULL\n"); + return; + } + + blob = data_blob_string_const_null(message); + imessaging_send(msg_ctx, src, MSG_DEBUGLEVEL, &blob); + + TALLOC_FREE(message); +} + +/* + return uptime of messaging server via irpc +*/ +static NTSTATUS irpc_uptime(struct irpc_message *msg, + struct irpc_uptime *r) +{ + struct imessaging_context *ctx = talloc_get_type(msg->private_data, struct imessaging_context); + *r->out.start_time = timeval_to_nttime(&ctx->start_time); + return NT_STATUS_OK; +} + +static struct dispatch_fn *imessaging_find_dispatch( + struct imessaging_context *msg, uint32_t msg_type) +{ + /* temporary IDs use an idtree, the rest use a array of pointers */ + if (msg_type >= MSG_TMP_BASE) { + return (struct dispatch_fn *)idr_find(msg->dispatch_tree, + msg_type); + } + if (msg_type < msg->num_types) { + return msg->dispatch[msg_type]; + } + return NULL; +} + +/* + Register a dispatch function for a particular message type. +*/ +NTSTATUS imessaging_register(struct imessaging_context *msg, void *private_data, + uint32_t msg_type, msg_callback_t fn) +{ + struct dispatch_fn *d; + + /* possibly expand dispatch array */ + if (msg_type >= msg->num_types) { + struct dispatch_fn **dp; + uint32_t i; + dp = talloc_realloc(msg, msg->dispatch, struct dispatch_fn *, msg_type+1); + NT_STATUS_HAVE_NO_MEMORY(dp); + msg->dispatch = dp; + for (i=msg->num_types;i<=msg_type;i++) { + msg->dispatch[i] = NULL; + } + msg->num_types = msg_type+1; + } + + d = talloc_zero(msg->dispatch, struct dispatch_fn); + NT_STATUS_HAVE_NO_MEMORY(d); + d->msg_type = msg_type; + d->private_data = private_data; + d->fn = fn; + + DLIST_ADD(msg->dispatch[msg_type], d); + + return NT_STATUS_OK; +} + +/* + register a temporary message handler. The msg_type is allocated + above MSG_TMP_BASE +*/ +NTSTATUS imessaging_register_tmp(struct imessaging_context *msg, void *private_data, + msg_callback_t fn, uint32_t *msg_type) +{ + struct dispatch_fn *d; + int id; + + d = talloc_zero(msg->dispatch, struct dispatch_fn); + NT_STATUS_HAVE_NO_MEMORY(d); + d->private_data = private_data; + d->fn = fn; + + id = idr_get_new_above(msg->dispatch_tree, d, MSG_TMP_BASE, UINT16_MAX); + if (id == -1) { + talloc_free(d); + return NT_STATUS_TOO_MANY_CONTEXT_IDS; + } + + d->msg_type = (uint32_t)id; + (*msg_type) = d->msg_type; + + return NT_STATUS_OK; +} + +/* + De-register the function for a particular message type. +*/ +void imessaging_deregister(struct imessaging_context *msg, uint32_t msg_type, void *private_data) +{ + struct dispatch_fn *d, *next; + + if (msg_type >= msg->num_types) { + d = (struct dispatch_fn *)idr_find(msg->dispatch_tree, + msg_type); + if (!d) return; + idr_remove(msg->dispatch_tree, msg_type); + talloc_free(d); + return; + } + + for (d = msg->dispatch[msg_type]; d; d = next) { + next = d->next; + if (d->private_data == private_data) { + DLIST_REMOVE(msg->dispatch[msg_type], d); + talloc_free(d); + } + } +} + +/* +*/ +int imessaging_cleanup(struct imessaging_context *msg) +{ + if (!msg) { + return 0; + } + return 0; +} + +static void imessaging_dgm_recv(struct tevent_context *ev, + const uint8_t *buf, size_t buf_len, + int *fds, size_t num_fds, + void *private_data); + +/* Keep a list of imessaging contexts */ +static struct imessaging_context *msg_ctxs; + +/* + * A process has terminated, clean-up any names it has registered. + */ +NTSTATUS imessaging_process_cleanup( + struct imessaging_context *msg_ctx, + pid_t pid) +{ + struct irpc_name_records *names = NULL; + uint32_t i = 0; + uint32_t j = 0; + TALLOC_CTX *mem_ctx = talloc_new(NULL); + + if (mem_ctx == NULL) { + DBG_ERR("OOM unable to clean up messaging for process (%d)\n", + pid); + return NT_STATUS_NO_MEMORY; + } + + names = irpc_all_servers(msg_ctx, mem_ctx); + if (names == NULL) { + TALLOC_FREE(mem_ctx); + return NT_STATUS_OK; + } + for (i = 0; i < names->num_records; i++) { + for (j = 0; j < names->names[i]->count; j++) { + if (names->names[i]->ids[j].pid == pid) { + int ret = server_id_db_prune_name( + msg_ctx->names, + names->names[i]->name, + names->names[i]->ids[j]); + if (ret != 0 && ret != ENOENT) { + TALLOC_FREE(mem_ctx); + return map_nt_error_from_unix_common( + ret); + } + } + } + } + TALLOC_FREE(mem_ctx); + return NT_STATUS_OK; +} + +static int imessaging_context_destructor(struct imessaging_context *msg) +{ + struct irpc_request *irpc = NULL; + struct irpc_request *next = NULL; + + for (irpc = msg->requests; irpc != NULL; irpc = next) { + next = irpc->next; + + DLIST_REMOVE(msg->requests, irpc); + irpc->callid = -1; + } + + DLIST_REMOVE(msg_ctxs, msg); + TALLOC_FREE(msg->msg_dgm_ref); + return 0; +} + +/* + * Cleanup messaging dgm contexts on a specific event context. + * + * We must make sure to unref all messaging_dgm_ref's *before* the + * tevent context goes away. Only when the last ref is freed, the + * refcounted messaging dgm context will be freed. + */ +void imessaging_dgm_unref_ev(struct tevent_context *ev) +{ + struct imessaging_context *msg = NULL; + + for (msg = msg_ctxs; msg != NULL; msg = msg->next) { + if (msg->ev == ev) { + TALLOC_FREE(msg->msg_dgm_ref); + } + } +} + +static NTSTATUS imessaging_reinit(struct imessaging_context *msg) +{ + int ret = -1; + + TALLOC_FREE(msg->msg_dgm_ref); + + if (msg->discard_incoming) { + msg->num_incoming_listeners = 0; + } else { + msg->num_incoming_listeners = 1; + } + + msg->server_id.pid = getpid(); + + msg->msg_dgm_ref = messaging_dgm_ref(msg, + msg->ev, + &msg->server_id.unique_id, + msg->sock_dir, + msg->lock_dir, + imessaging_dgm_recv, + msg, + &ret); + + if (msg->msg_dgm_ref == NULL) { + DEBUG(2, ("messaging_dgm_ref failed: %s\n", + strerror(ret))); + return map_nt_error_from_unix_common(ret); + } + + server_id_db_reinit(msg->names, msg->server_id); + return NT_STATUS_OK; +} + +/* + * Must be called after a fork. + */ +NTSTATUS imessaging_reinit_all(void) +{ + struct imessaging_context *msg = NULL; + + for (msg = msg_ctxs; msg != NULL; msg = msg->next) { + NTSTATUS status = imessaging_reinit(msg); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + return NT_STATUS_OK; +} + +/* + create the listening socket and setup the dispatcher +*/ +static struct imessaging_context *imessaging_init_internal( + TALLOC_CTX *mem_ctx, + bool discard_incoming, + struct loadparm_context *lp_ctx, + struct server_id server_id, + struct tevent_context *ev) +{ + NTSTATUS status; + struct imessaging_context *msg; + bool ok; + int ret; + const char *lock_dir = NULL; + int tdb_flags = TDB_INCOMPATIBLE_HASH | TDB_CLEAR_IF_FIRST; + + if (ev == NULL) { + return NULL; + } + + msg = talloc_zero(mem_ctx, struct imessaging_context); + if (msg == NULL) { + return NULL; + } + msg->ev = ev; + msg->discard_incoming = discard_incoming; + if (msg->discard_incoming) { + msg->num_incoming_listeners = 0; + } else { + msg->num_incoming_listeners = 1; + } + + talloc_set_destructor(msg, imessaging_context_destructor); + + /* create the messaging directory if needed */ + + lock_dir = lpcfg_lock_directory(lp_ctx); + if (lock_dir == NULL) { + goto fail; + } + + msg->sock_dir = lpcfg_private_path(msg, lp_ctx, "msg.sock"); + if (msg->sock_dir == NULL) { + goto fail; + } + ok = directory_create_or_exist_strict(msg->sock_dir, geteuid(), 0700); + if (!ok) { + goto fail; + } + + msg->lock_dir = lpcfg_lock_path(msg, lp_ctx, "msg.lock"); + if (msg->lock_dir == NULL) { + goto fail; + } + ok = directory_create_or_exist_strict(msg->lock_dir, geteuid(), 0755); + if (!ok) { + goto fail; + } + + msg->msg_dgm_ref = messaging_dgm_ref( + msg, ev, &server_id.unique_id, msg->sock_dir, msg->lock_dir, + imessaging_dgm_recv, msg, &ret); + + if (msg->msg_dgm_ref == NULL) { + goto fail; + } + + msg->server_id = server_id; + msg->idr = idr_init(msg); + if (msg->idr == NULL) { + goto fail; + } + + msg->dispatch_tree = idr_init(msg); + if (msg->dispatch_tree == NULL) { + goto fail; + } + + msg->start_time = timeval_current(); + + tdb_flags |= lpcfg_tdb_flags(lp_ctx, 0); + + /* + * This context holds a destructor that cleans up any names + * registered on this context on talloc_free() + */ + msg->names = server_id_db_init(msg, server_id, lock_dir, 0, tdb_flags); + if (msg->names == NULL) { + goto fail; + } + + status = imessaging_register(msg, NULL, MSG_PING, ping_message); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = imessaging_register(msg, NULL, MSG_REQ_POOL_USAGE, + pool_message); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = imessaging_register(msg, NULL, MSG_IRPC, irpc_handler); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = imessaging_register(msg, NULL, MSG_REQ_RINGBUF_LOG, + ringbuf_log_msg); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = imessaging_register(msg, NULL, MSG_DEBUG, + debug_imessage); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = imessaging_register(msg, NULL, MSG_REQ_DEBUGLEVEL, + debuglevel_imessage); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + status = IRPC_REGISTER(msg, irpc, IRPC_UPTIME, irpc_uptime, msg); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } +#if defined(DEVELOPER) || defined(ENABLE_SELFTEST) + /* + * Register handlers for messages specific to developer and + * self test builds + */ + status = imessaging_register_extra_handlers(msg); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } +#endif /* defined(DEVELOPER) || defined(ENABLE_SELFTEST) */ + + DLIST_ADD(msg_ctxs, msg); + + return msg; +fail: + talloc_free(msg); + return NULL; +} + +/* + create the listening socket and setup the dispatcher +*/ +struct imessaging_context *imessaging_init(TALLOC_CTX *mem_ctx, + struct loadparm_context *lp_ctx, + struct server_id server_id, + struct tevent_context *ev) +{ + bool discard_incoming = false; + return imessaging_init_internal(mem_ctx, + discard_incoming, + lp_ctx, + server_id, + ev); +} + +struct imessaging_context *imessaging_init_discard_incoming( + TALLOC_CTX *mem_ctx, + struct loadparm_context *lp_ctx, + struct server_id server_id, + struct tevent_context *ev) +{ + bool discard_incoming = true; + return imessaging_init_internal(mem_ctx, + discard_incoming, + lp_ctx, + server_id, + ev); +} + +struct imessaging_post_state { + struct imessaging_context *msg_ctx; + struct imessaging_post_state **busy_ref; + size_t buf_len; + uint8_t buf[]; +}; + +static int imessaging_post_state_destructor(struct imessaging_post_state *state) +{ + if (state->busy_ref != NULL) { + *state->busy_ref = NULL; + state->busy_ref = NULL; + } + return 0; +} + +static void imessaging_post_handler(struct tevent_context *ev, + struct tevent_immediate *ti, + void *private_data) +{ + struct imessaging_post_state *state = talloc_get_type_abort( + private_data, struct imessaging_post_state); + + if (state == NULL) { + return; + } + + /* + * In usecases like using messaging_client_init() with irpc processing + * we may free the imessaging_context during the messaging handler. + * imessaging_post_state is a child of imessaging_context and + * might be implicitly free'ed before the explicit TALLOC_FREE(state). + * + * The busy_ref pointer makes sure the destructor clears + * the local 'state' variable. + */ + + SMB_ASSERT(state->busy_ref == NULL); + state->busy_ref = &state; + + imessaging_dgm_recv(ev, state->buf, state->buf_len, NULL, 0, + state->msg_ctx); + + state->busy_ref = NULL; + TALLOC_FREE(state); +} + +static int imessaging_post_self(struct imessaging_context *msg, + const uint8_t *buf, size_t buf_len) +{ + struct tevent_immediate *ti; + struct imessaging_post_state *state; + + state = talloc_size( + msg, offsetof(struct imessaging_post_state, buf) + buf_len); + if (state == NULL) { + return ENOMEM; + } + talloc_set_name_const(state, "struct imessaging_post_state"); + + talloc_set_destructor(state, imessaging_post_state_destructor); + + ti = tevent_create_immediate(state); + if (ti == NULL) { + TALLOC_FREE(state); + return ENOMEM; + } + + state->msg_ctx = msg; + state->busy_ref = NULL; + state->buf_len = buf_len; + memcpy(state->buf, buf, buf_len); + + tevent_schedule_immediate(ti, msg->ev, imessaging_post_handler, + state); + + return 0; +} + +static void imessaging_dgm_recv(struct tevent_context *ev, + const uint8_t *buf, size_t buf_len, + int *fds, size_t num_fds, + void *private_data) +{ + struct imessaging_context *msg = talloc_get_type_abort( + private_data, struct imessaging_context); + uint32_t msg_type; + struct server_id src, dst; + struct server_id_buf srcbuf, dstbuf; + DATA_BLOB data; + + if (buf_len < MESSAGE_HDR_LENGTH) { + /* Invalid message, ignore */ + return; + } + + if (msg->num_incoming_listeners == 0) { + struct server_id_buf selfbuf; + + message_hdr_get(&msg_type, &src, &dst, buf); + + DBG_DEBUG("not listening - discarding message from " + "src[%s] to dst[%s] (self[%s]) type=0x%x " + "on %s event context\n", + server_id_str_buf(src, &srcbuf), + server_id_str_buf(dst, &dstbuf), + server_id_str_buf(msg->server_id, &selfbuf), + (unsigned)msg_type, + (ev != msg->ev) ? "different" : "main"); + return; + } + + if (ev != msg->ev) { + int ret; + ret = imessaging_post_self(msg, buf, buf_len); + if (ret != 0) { + DBG_WARNING("imessaging_post_self failed: %s\n", + strerror(ret)); + } + return; + } + + message_hdr_get(&msg_type, &src, &dst, buf); + + data.data = discard_const_p(uint8_t, buf + MESSAGE_HDR_LENGTH); + data.length = buf_len - MESSAGE_HDR_LENGTH; + + if ((cluster_id_equal(&dst, &msg->server_id)) || + ((dst.task_id == 0) && (msg->server_id.pid == 0))) { + struct dispatch_fn *d, *next; + + DEBUG(10, ("%s: dst %s matches my id: %s, type=0x%x\n", + __func__, + server_id_str_buf(dst, &dstbuf), + server_id_str_buf(msg->server_id, &srcbuf), + (unsigned)msg_type)); + + d = imessaging_find_dispatch(msg, msg_type); + + for (; d; d = next) { + next = d->next; + d->fn(msg, + d->private_data, + d->msg_type, + src, + num_fds, + fds, + &data); + } + } else { + DEBUG(10, ("%s: Ignoring type=0x%x dst %s, I am %s, \n", + __func__, (unsigned)msg_type, + server_id_str_buf(dst, &dstbuf), + server_id_str_buf(msg->server_id, &srcbuf))); + } +} + +/* + A hack, for the short term until we get 'client only' messaging in place +*/ +struct imessaging_context *imessaging_client_init(TALLOC_CTX *mem_ctx, + struct loadparm_context *lp_ctx, + struct tevent_context *ev) +{ + struct server_id id; + ZERO_STRUCT(id); + id.pid = getpid(); + id.task_id = generate_random(); + id.vnn = NONCLUSTER_VNN; + + /* This is because we are not in the s3 serverid database */ + id.unique_id = SERVERID_UNIQUE_ID_NOT_TO_VERIFY; + + return imessaging_init_discard_incoming(mem_ctx, lp_ctx, id, ev); +} + +/* + a list of registered irpc server functions +*/ +struct irpc_list { + struct irpc_list *next, *prev; + struct GUID uuid; + const struct ndr_interface_table *table; + int callnum; + irpc_function_t fn; + void *private_data; +}; + + +/* + register a irpc server function +*/ +NTSTATUS irpc_register(struct imessaging_context *msg_ctx, + const struct ndr_interface_table *table, + int callnum, irpc_function_t fn, void *private_data) +{ + struct irpc_list *irpc; + + /* override an existing handler, if any */ + for (irpc=msg_ctx->irpc; irpc; irpc=irpc->next) { + if (irpc->table == table && irpc->callnum == callnum) { + break; + } + } + if (irpc == NULL) { + irpc = talloc(msg_ctx, struct irpc_list); + NT_STATUS_HAVE_NO_MEMORY(irpc); + DLIST_ADD(msg_ctx->irpc, irpc); + } + + irpc->table = table; + irpc->callnum = callnum; + irpc->fn = fn; + irpc->private_data = private_data; + irpc->uuid = irpc->table->syntax_id.uuid; + + return NT_STATUS_OK; +} + + +/* + handle an incoming irpc reply message +*/ +static void irpc_handler_reply(struct imessaging_context *msg_ctx, struct irpc_message *m) +{ + struct irpc_request *irpc; + + irpc = (struct irpc_request *)idr_find(msg_ctx->idr, m->header.callid); + if (irpc == NULL) return; + + irpc->incoming.handler(irpc, m); +} + +/* + send a irpc reply +*/ +NTSTATUS irpc_send_reply(struct irpc_message *m, NTSTATUS status) +{ + struct ndr_push *push; + DATA_BLOB packet; + enum ndr_err_code ndr_err; + + m->header.status = status; + + /* setup the reply */ + push = ndr_push_init_ctx(m->ndr); + if (push == NULL) { + status = NT_STATUS_NO_MEMORY; + goto failed; + } + + m->header.flags |= IRPC_FLAG_REPLY; + m->header.creds.token= NULL; + + /* construct the packet */ + ndr_err = ndr_push_irpc_header(push, NDR_SCALARS|NDR_BUFFERS, &m->header); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + status = ndr_map_error2ntstatus(ndr_err); + goto failed; + } + + ndr_err = m->irpc->table->calls[m->irpc->callnum].ndr_push(push, NDR_OUT, m->data); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + status = ndr_map_error2ntstatus(ndr_err); + goto failed; + } + + /* send the reply message */ + packet = ndr_push_blob(push); + status = imessaging_send(m->msg_ctx, m->from, MSG_IRPC, &packet); + if (!NT_STATUS_IS_OK(status)) goto failed; + +failed: + talloc_free(m); + return status; +} + +/* + handle an incoming irpc request message +*/ +static void irpc_handler_request(struct imessaging_context *msg_ctx, + struct irpc_message *m) +{ + struct irpc_list *i; + void *r; + enum ndr_err_code ndr_err; + + for (i=msg_ctx->irpc; i; i=i->next) { + if (GUID_equal(&i->uuid, &m->header.uuid) && + i->table->syntax_id.if_version == m->header.if_version && + i->callnum == m->header.callnum) { + break; + } + } + + if (i == NULL) { + /* no registered handler for this message */ + talloc_free(m); + return; + } + + /* allocate space for the structure */ + r = talloc_zero_size(m->ndr, i->table->calls[m->header.callnum].struct_size); + if (r == NULL) goto failed; + + m->ndr->flags |= LIBNDR_FLAG_REF_ALLOC; + + /* parse the request data */ + ndr_err = i->table->calls[i->callnum].ndr_pull(m->ndr, NDR_IN, r); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) goto failed; + + /* make the call */ + m->private_data= i->private_data; + m->defer_reply = false; + m->no_reply = false; + m->msg_ctx = msg_ctx; + m->irpc = i; + m->data = r; + + m->header.status = i->fn(m, r); + + if (m->no_reply) { + /* the server function won't ever be replying to this request */ + talloc_free(m); + return; + } + + if (m->defer_reply) { + /* the server function has asked to defer the reply to later */ + talloc_steal(msg_ctx, m); + return; + } + + irpc_send_reply(m, m->header.status); + return; + +failed: + talloc_free(m); +} + +/* + handle an incoming irpc message +*/ +static void irpc_handler(struct imessaging_context *msg_ctx, + void *private_data, + uint32_t msg_type, + struct server_id src, + size_t num_fds, + int *fds, + DATA_BLOB *packet) +{ + struct irpc_message *m; + enum ndr_err_code ndr_err; + + if (num_fds != 0) { + DBG_WARNING("Received %zu fds, ignoring message\n", num_fds); + return; + } + + m = talloc(msg_ctx, struct irpc_message); + if (m == NULL) goto failed; + + m->from = src; + + m->ndr = ndr_pull_init_blob(packet, m); + if (m->ndr == NULL) goto failed; + + m->ndr->flags |= LIBNDR_FLAG_REF_ALLOC; + + ndr_err = ndr_pull_irpc_header(m->ndr, NDR_BUFFERS|NDR_SCALARS, &m->header); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) goto failed; + + if (m->header.flags & IRPC_FLAG_REPLY) { + irpc_handler_reply(msg_ctx, m); + } else { + irpc_handler_request(msg_ctx, m); + } + return; + +failed: + talloc_free(m); +} + + +/* + destroy a irpc request +*/ +static int irpc_destructor(struct irpc_request *irpc) +{ + if (irpc->callid != -1) { + DLIST_REMOVE(irpc->msg_ctx->requests, irpc); + idr_remove(irpc->msg_ctx->idr, irpc->callid); + if (irpc->msg_ctx->discard_incoming) { + SMB_ASSERT(irpc->msg_ctx->num_incoming_listeners > 0); + } else { + SMB_ASSERT(irpc->msg_ctx->num_incoming_listeners > 1); + } + irpc->msg_ctx->num_incoming_listeners -= 1; + irpc->callid = -1; + } + + return 0; +} + +/* + add a string name that this irpc server can be called on + + It will be removed from the DB either via irpc_remove_name or on + talloc_free(msg_ctx->names). +*/ +NTSTATUS irpc_add_name(struct imessaging_context *msg_ctx, const char *name) +{ + int ret; + + ret = server_id_db_add(msg_ctx->names, name); + if (ret != 0) { + return map_nt_error_from_unix_common(ret); + } + return NT_STATUS_OK; +} + +static int all_servers_func(const char *name, unsigned num_servers, + const struct server_id *servers, + void *private_data) +{ + struct irpc_name_records *name_records = talloc_get_type( + private_data, struct irpc_name_records); + struct irpc_name_record *name_record; + uint32_t i; + + name_records->names + = talloc_realloc(name_records, name_records->names, + struct irpc_name_record *, name_records->num_records+1); + if (!name_records->names) { + return -1; + } + + name_records->names[name_records->num_records] = name_record + = talloc(name_records->names, + struct irpc_name_record); + if (!name_record) { + return -1; + } + + name_records->num_records++; + + name_record->name = talloc_strdup(name_record, name); + if (!name_record->name) { + return -1; + } + + name_record->count = num_servers; + name_record->ids = talloc_array(name_record, struct server_id, + num_servers); + if (name_record->ids == NULL) { + return -1; + } + for (i=0;i<name_record->count;i++) { + name_record->ids[i] = servers[i]; + } + return 0; +} + +/* + return a list of server ids for a server name +*/ +struct irpc_name_records *irpc_all_servers(struct imessaging_context *msg_ctx, + TALLOC_CTX *mem_ctx) +{ + int ret; + struct irpc_name_records *name_records = talloc_zero(mem_ctx, struct irpc_name_records); + if (name_records == NULL) { + return NULL; + } + + ret = server_id_db_traverse_read(msg_ctx->names, all_servers_func, + name_records); + if (ret == -1) { + TALLOC_FREE(name_records); + return NULL; + } + + return name_records; +} + +/* + remove a name from a messaging context +*/ +void irpc_remove_name(struct imessaging_context *msg_ctx, const char *name) +{ + server_id_db_remove(msg_ctx->names, name); +} + +struct server_id imessaging_get_server_id(struct imessaging_context *msg_ctx) +{ + return msg_ctx->server_id; +} + +struct irpc_bh_state { + struct imessaging_context *msg_ctx; + struct server_id server_id; + const struct ndr_interface_table *table; + uint32_t timeout; + struct security_token *token; +}; + +static bool irpc_bh_is_connected(struct dcerpc_binding_handle *h) +{ + struct irpc_bh_state *hs = dcerpc_binding_handle_data(h, + struct irpc_bh_state); + + if (!hs->msg_ctx) { + return false; + } + + return true; +} + +static uint32_t irpc_bh_set_timeout(struct dcerpc_binding_handle *h, + uint32_t timeout) +{ + struct irpc_bh_state *hs = dcerpc_binding_handle_data(h, + struct irpc_bh_state); + uint32_t old = hs->timeout; + + hs->timeout = timeout; + + return old; +} + +struct irpc_bh_raw_call_state { + struct irpc_request *irpc; + uint32_t opnum; + DATA_BLOB in_data; + DATA_BLOB in_packet; + DATA_BLOB out_data; +}; + +static void irpc_bh_raw_call_incoming_handler(struct irpc_request *irpc, + struct irpc_message *m); + +static struct tevent_req *irpc_bh_raw_call_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct dcerpc_binding_handle *h, + const struct GUID *object, + uint32_t opnum, + uint32_t in_flags, + const uint8_t *in_data, + size_t in_length) +{ + struct irpc_bh_state *hs = + dcerpc_binding_handle_data(h, + struct irpc_bh_state); + struct tevent_req *req; + struct irpc_bh_raw_call_state *state; + bool ok; + struct irpc_header header; + struct ndr_push *ndr; + NTSTATUS status; + enum ndr_err_code ndr_err; + + req = tevent_req_create(mem_ctx, &state, + struct irpc_bh_raw_call_state); + if (req == NULL) { + return NULL; + } + state->opnum = opnum; + state->in_data.data = discard_const_p(uint8_t, in_data); + state->in_data.length = in_length; + + ok = irpc_bh_is_connected(h); + if (!ok) { + tevent_req_nterror(req, NT_STATUS_CONNECTION_DISCONNECTED); + return tevent_req_post(req, ev); + } + + state->irpc = talloc_zero(state, struct irpc_request); + if (tevent_req_nomem(state->irpc, req)) { + return tevent_req_post(req, ev); + } + + state->irpc->msg_ctx = hs->msg_ctx; + state->irpc->callid = idr_get_new(hs->msg_ctx->idr, + state->irpc, UINT16_MAX); + if (state->irpc->callid == -1) { + tevent_req_nterror(req, NT_STATUS_INSUFFICIENT_RESOURCES); + return tevent_req_post(req, ev); + } + state->irpc->incoming.handler = irpc_bh_raw_call_incoming_handler; + state->irpc->incoming.private_data = req; + + /* make sure we accept incoming messages */ + SMB_ASSERT(state->irpc->msg_ctx->num_incoming_listeners < UINT64_MAX); + state->irpc->msg_ctx->num_incoming_listeners += 1; + DLIST_ADD_END(state->irpc->msg_ctx->requests, state->irpc); + talloc_set_destructor(state->irpc, irpc_destructor); + + /* setup the header */ + header.uuid = hs->table->syntax_id.uuid; + + header.if_version = hs->table->syntax_id.if_version; + header.callid = state->irpc->callid; + header.callnum = state->opnum; + header.flags = 0; + header.status = NT_STATUS_OK; + header.creds.token= hs->token; + + /* construct the irpc packet */ + ndr = ndr_push_init_ctx(state->irpc); + if (tevent_req_nomem(ndr, req)) { + return tevent_req_post(req, ev); + } + + ndr_err = ndr_push_irpc_header(ndr, NDR_SCALARS|NDR_BUFFERS, &header); + status = ndr_map_error2ntstatus(ndr_err); + if (!NT_STATUS_IS_OK(status)) { + tevent_req_nterror(req, status); + return tevent_req_post(req, ev); + } + + ndr_err = ndr_push_bytes(ndr, in_data, in_length); + status = ndr_map_error2ntstatus(ndr_err); + if (!NT_STATUS_IS_OK(status)) { + tevent_req_nterror(req, status); + return tevent_req_post(req, ev); + } + + /* and send it */ + state->in_packet = ndr_push_blob(ndr); + status = imessaging_send(hs->msg_ctx, hs->server_id, + MSG_IRPC, &state->in_packet); + if (!NT_STATUS_IS_OK(status)) { + tevent_req_nterror(req, status); + return tevent_req_post(req, ev); + } + + if (hs->timeout != IRPC_CALL_TIMEOUT_INF) { + /* set timeout-callback in case caller wants that */ + ok = tevent_req_set_endtime(req, ev, timeval_current_ofs(hs->timeout, 0)); + if (!ok) { + return tevent_req_post(req, ev); + } + } + + return req; +} + +static void irpc_bh_raw_call_incoming_handler(struct irpc_request *irpc, + struct irpc_message *m) +{ + struct tevent_req *req = + talloc_get_type_abort(irpc->incoming.private_data, + struct tevent_req); + struct irpc_bh_raw_call_state *state = + tevent_req_data(req, + struct irpc_bh_raw_call_state); + + talloc_steal(state, m); + + if (!NT_STATUS_IS_OK(m->header.status)) { + tevent_req_nterror(req, m->header.status); + return; + } + + state->out_data = data_blob_talloc(state, + m->ndr->data + m->ndr->offset, + m->ndr->data_size - m->ndr->offset); + if ((m->ndr->data_size - m->ndr->offset) > 0 && !state->out_data.data) { + tevent_req_oom(req); + return; + } + + tevent_req_done(req); +} + +static NTSTATUS irpc_bh_raw_call_recv(struct tevent_req *req, + TALLOC_CTX *mem_ctx, + uint8_t **out_data, + size_t *out_length, + uint32_t *out_flags) +{ + struct irpc_bh_raw_call_state *state = + tevent_req_data(req, + struct irpc_bh_raw_call_state); + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + tevent_req_received(req); + return status; + } + + *out_data = talloc_move(mem_ctx, &state->out_data.data); + *out_length = state->out_data.length; + *out_flags = 0; + tevent_req_received(req); + return NT_STATUS_OK; +} + +struct irpc_bh_disconnect_state { + uint8_t _dummy; +}; + +static struct tevent_req *irpc_bh_disconnect_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct dcerpc_binding_handle *h) +{ + struct irpc_bh_state *hs = dcerpc_binding_handle_data(h, + struct irpc_bh_state); + struct tevent_req *req; + struct irpc_bh_disconnect_state *state; + bool ok; + + req = tevent_req_create(mem_ctx, &state, + struct irpc_bh_disconnect_state); + if (req == NULL) { + return NULL; + } + + ok = irpc_bh_is_connected(h); + if (!ok) { + tevent_req_nterror(req, NT_STATUS_CONNECTION_DISCONNECTED); + return tevent_req_post(req, ev); + } + + hs->msg_ctx = NULL; + + tevent_req_done(req); + return tevent_req_post(req, ev); +} + +static NTSTATUS irpc_bh_disconnect_recv(struct tevent_req *req) +{ + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + tevent_req_received(req); + return status; + } + + tevent_req_received(req); + return NT_STATUS_OK; +} + +static bool irpc_bh_ref_alloc(struct dcerpc_binding_handle *h) +{ + return true; +} + +static const struct dcerpc_binding_handle_ops irpc_bh_ops = { + .name = "wbint", + .is_connected = irpc_bh_is_connected, + .set_timeout = irpc_bh_set_timeout, + .raw_call_send = irpc_bh_raw_call_send, + .raw_call_recv = irpc_bh_raw_call_recv, + .disconnect_send = irpc_bh_disconnect_send, + .disconnect_recv = irpc_bh_disconnect_recv, + + .ref_alloc = irpc_bh_ref_alloc, +}; + +/* initialise a irpc binding handle */ +struct dcerpc_binding_handle *irpc_binding_handle(TALLOC_CTX *mem_ctx, + struct imessaging_context *msg_ctx, + struct server_id server_id, + const struct ndr_interface_table *table) +{ + struct dcerpc_binding_handle *h; + struct irpc_bh_state *hs; + + h = dcerpc_binding_handle_create(mem_ctx, + &irpc_bh_ops, + NULL, + table, + &hs, + struct irpc_bh_state, + __location__); + if (h == NULL) { + return NULL; + } + hs->msg_ctx = msg_ctx; + hs->server_id = server_id; + hs->table = table; + hs->timeout = IRPC_CALL_TIMEOUT; + + return h; +} + +struct dcerpc_binding_handle *irpc_binding_handle_by_name(TALLOC_CTX *mem_ctx, + struct imessaging_context *msg_ctx, + const char *dest_task, + const struct ndr_interface_table *table) +{ + struct dcerpc_binding_handle *h; + unsigned num_sids; + struct server_id *sids; + struct server_id sid; + NTSTATUS status; + + /* find the server task */ + + status = irpc_servers_byname(msg_ctx, mem_ctx, dest_task, + &num_sids, &sids); + if (!NT_STATUS_IS_OK(status)) { + errno = EADDRNOTAVAIL; + return NULL; + } + sid = sids[0]; + talloc_free(sids); + + h = irpc_binding_handle(mem_ctx, msg_ctx, + sid, table); + if (h == NULL) { + return NULL; + } + + return h; +} + +void irpc_binding_handle_add_security_token(struct dcerpc_binding_handle *h, + struct security_token *token) +{ + struct irpc_bh_state *hs = + dcerpc_binding_handle_data(h, + struct irpc_bh_state); + + hs->token = token; +} |