wmi-1.3.16 from opsview.com

2019-02-16 00:16:52 +01:00
parent 163fdd3d1b
commit 17b3af2911
2146 changed files with 678824 additions and 0 deletions
@@ -0,0 +1,242 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   low level socket handling for nbt dgram requests (UDP138)
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "lib/util/dlinklist.h"
+#include "libcli/dgram/libdgram.h"
+#include "lib/socket/socket.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+
+
+/*
+  handle recv events on a nbt dgram socket
+*/
+static void dgm_socket_recv(struct nbt_dgram_socket *dgmsock)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(dgmsock);
+	NTSTATUS status;
+	struct socket_address *src;
+	DATA_BLOB blob;
+	size_t nread, dsize;
+	struct nbt_dgram_packet *packet;
+	const char *mailslot_name;
+
+	status = socket_pending(dgmsock->sock, &dsize);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	blob = data_blob_talloc(tmp_ctx, NULL, dsize);
+	if (blob.data == NULL) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	status = socket_recvfrom(dgmsock->sock, blob.data, blob.length, &nread,
+				 tmp_ctx, &src);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+	blob.length = nread;
+
+	DEBUG(2,("Received dgram packet of length %d from %s:%d\n", 
+		 (int)blob.length, src->addr, src->port));
+
+	packet = talloc(tmp_ctx, struct nbt_dgram_packet);
+	if (packet == NULL) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	/* parse the request */
+	status = ndr_pull_struct_blob(&blob, packet, packet, 
+				      (ndr_pull_flags_fn_t)ndr_pull_nbt_dgram_packet);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(2,("Failed to parse incoming NBT DGRAM packet - %s\n",
+			 nt_errstr(status)));
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	/* if this is a mailslot message, then see if we can dispatch it to a handler */
+	mailslot_name = dgram_mailslot_name(packet);
+	if (mailslot_name) {
+		struct dgram_mailslot_handler *dgmslot;
+		dgmslot = dgram_mailslot_find(dgmsock, mailslot_name);
+		if (dgmslot) {
+			dgmslot->handler(dgmslot, packet, src);
+		} else {
+			DEBUG(2,("No mailslot handler for '%s'\n", mailslot_name));
+		}
+	} else {
+		/* dispatch if there is a general handler */
+		if (dgmsock->incoming.handler) {
+			dgmsock->incoming.handler(dgmsock, packet, src);
+		}
+	}
+
+	talloc_free(tmp_ctx);
+}
+
+
+/*
+  handle send events on a nbt dgram socket
+*/
+static void dgm_socket_send(struct nbt_dgram_socket *dgmsock)
+{
+	struct nbt_dgram_request *req;
+	NTSTATUS status;
+
+	while ((req = dgmsock->send_queue)) {
+		size_t len;
+		
+		len = req->encoded.length;
+		status = socket_sendto(dgmsock->sock, &req->encoded, &len,
+				       req->dest);
+		if (NT_STATUS_IS_ERR(status)) {
+			DEBUG(3,("Failed to send datagram of length %u to %s:%d: %s\n",
+				 (unsigned)req->encoded.length, req->dest->addr, req->dest->port, 
+				 nt_errstr(status)));
+			DLIST_REMOVE(dgmsock->send_queue, req);
+			talloc_free(req);
+			continue;
+		}
+
+		if (!NT_STATUS_IS_OK(status)) return;
+
+		DLIST_REMOVE(dgmsock->send_queue, req);
+		talloc_free(req);
+	}
+
+	EVENT_FD_NOT_WRITEABLE(dgmsock->fde);
+	return;
+}
+
+
+/*
+  handle fd events on a nbt_dgram_socket
+*/
+static void dgm_socket_handler(struct event_context *ev, struct fd_event *fde,
+			       uint16_t flags, void *private)
+{
+	struct nbt_dgram_socket *dgmsock = talloc_get_type(private, 
+							   struct nbt_dgram_socket);
+	if (flags & EVENT_FD_WRITE) {
+		dgm_socket_send(dgmsock);
+	} 
+	if (flags & EVENT_FD_READ) {
+		dgm_socket_recv(dgmsock);
+	}
+}
+
+/*
+  initialise a nbt_dgram_socket. The event_ctx is optional, if provided
+  then operations will use that event context
+*/
+struct nbt_dgram_socket *nbt_dgram_socket_init(TALLOC_CTX *mem_ctx, 
+					      struct event_context *event_ctx)
+{
+	struct nbt_dgram_socket *dgmsock;
+	NTSTATUS status;
+
+	dgmsock = talloc(mem_ctx, struct nbt_dgram_socket);
+	if (dgmsock == NULL) goto failed;
+
+	if (event_ctx == NULL) {
+		dgmsock->event_ctx = event_context_init(dgmsock);
+	} else {
+		dgmsock->event_ctx = talloc_reference(dgmsock, event_ctx);
+	}
+	if (dgmsock->event_ctx == NULL) goto failed;
+
+	status = socket_create("ip", SOCKET_TYPE_DGRAM, &dgmsock->sock, 0);
+	if (!NT_STATUS_IS_OK(status)) goto failed;
+
+	socket_set_option(dgmsock->sock, "SO_BROADCAST", "1");
+
+	talloc_steal(dgmsock, dgmsock->sock);
+
+	dgmsock->fde = event_add_fd(dgmsock->event_ctx, dgmsock, 
+				    socket_get_fd(dgmsock->sock), 0,
+				    dgm_socket_handler, dgmsock);
+
+	dgmsock->send_queue = NULL;
+	dgmsock->incoming.handler = NULL;
+	dgmsock->mailslot_handlers = NULL;
+	
+	return dgmsock;
+
+failed:
+	talloc_free(dgmsock);
+	return NULL;
+}
+
+
+/*
+  setup a handler for generic incoming requests
+*/
+NTSTATUS dgram_set_incoming_handler(struct nbt_dgram_socket *dgmsock,
+				    void (*handler)(struct nbt_dgram_socket *, 
+						    struct nbt_dgram_packet *, 
+						    struct socket_address *),
+				    void *private)
+{
+	dgmsock->incoming.handler = handler;
+	dgmsock->incoming.private = private;
+	EVENT_FD_READABLE(dgmsock->fde);
+	return NT_STATUS_OK;
+}
+
+
+/*
+  queue a datagram for send
+*/
+NTSTATUS nbt_dgram_send(struct nbt_dgram_socket *dgmsock,
+			struct nbt_dgram_packet *packet,
+			struct socket_address *dest)
+{
+	struct nbt_dgram_request *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	req = talloc(dgmsock, struct nbt_dgram_request);
+	if (req == NULL) goto failed;
+
+	req->dest = dest;
+	if (talloc_reference(req, dest) == NULL) goto failed;
+
+	status = ndr_push_struct_blob(&req->encoded, req, packet, 
+				      (ndr_push_flags_fn_t)ndr_push_nbt_dgram_packet);
+	if (!NT_STATUS_IS_OK(status)) goto failed;
+
+	DLIST_ADD_END(dgmsock->send_queue, req, struct nbt_dgram_request *);
+
+	EVENT_FD_WRITEABLE(dgmsock->fde);
+
+	return NT_STATUS_OK;
+
+failed:
+	talloc_free(req);
+	return status;
+}