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Diffstat (limited to 'source4/libcli/dgram/dgramsocket.c')
-rw-r--r--source4/libcli/dgram/dgramsocket.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/source4/libcli/dgram/dgramsocket.c b/source4/libcli/dgram/dgramsocket.c
new file mode 100644
index 0000000000..7f179bc3c3
--- /dev/null
+++ b/source4/libcli/dgram/dgramsocket.c
@@ -0,0 +1,153 @@
+/*
+ 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 "dlinklist.h"
+#include "libcli/nbt/libnbt.h"
+#include "libcli/dgram/libdgram.h"
+#include "lib/socket/socket.h"
+
+#define DGRAM_MAX_PACKET_SIZE 2048
+
+
+/*
+ handle recv events on a nbt dgram socket
+*/
+static void dgm_socket_recv(struct nbt_dgram_socket *nbtsock)
+{
+ TALLOC_CTX *tmp_ctx = talloc_new(nbtsock);
+ NTSTATUS status;
+ const char *src_addr;
+ int src_port;
+ DATA_BLOB blob;
+ size_t nread;
+ struct nbt_dgram_packet *packet;
+
+ blob = data_blob_talloc(tmp_ctx, NULL, DGRAM_MAX_PACKET_SIZE);
+ if (blob.data == NULL) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ status = socket_recvfrom(nbtsock->sock, blob.data, blob.length, &nread, 0,
+ &src_addr, &src_port);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+ talloc_steal(tmp_ctx, src_addr);
+ blob.length = nread;
+
+ DEBUG(0,("Received dgram packet of length %d from %s:%d\n",
+ 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;
+ }
+
+ NDR_PRINT_DEBUG(nbt_dgram_packet, packet);
+
+ talloc_free(tmp_ctx);
+}
+
+
+/*
+ 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) {
+ /* nothing at the moment */
+ } else 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);
+
+ return dgmsock;
+
+failed:
+ talloc_free(dgmsock);
+ return NULL;
+}
+
+
+/*
+ setup a handler for incoming requests
+*/
+NTSTATUS dgram_set_incoming_handler(struct nbt_dgram_socket *dgmsock,
+ void (*handler)(struct nbt_dgram_socket *,
+ struct nbt_dgram_packet *,
+ const char *, int ),
+ void *private)
+{
+ dgmsock->incoming.handler = handler;
+ dgmsock->incoming.private = private;
+ EVENT_FD_READABLE(dgmsock->fde);
+ return NT_STATUS_OK;
+}