Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 564 insertions, 0 deletions

diff --git a/libcli/nbt/nbtsocket.c b/libcli/nbt/nbtsocket.c
new file mode 100644
index 0000000..97b0ca3
--- /dev/null
+++ b/libcli/nbt/nbtsocket.c
@@ -0,0 +1,564 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   low level socket handling for nbt requests
+
+   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 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/dlinklist.h"
+#include "../libcli/nbt/libnbt.h"
+#include "../libcli/nbt/nbt_proto.h"
+#include "lib/socket/socket.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "param/param.h"
+
+#define NBT_MAX_REPLIES 1000
+
+/*
+  destroy a pending request
+*/
+static int nbt_name_request_destructor(struct nbt_name_request *req)
+{
+	if (req->state == NBT_REQUEST_SEND) {
+		DLIST_REMOVE(req->nbtsock->send_queue, req);
+	}
+	if (req->state == NBT_REQUEST_WAIT) {
+		req->nbtsock->num_pending--;
+	}
+	if (req->name_trn_id != 0 && !req->is_reply) {
+		idr_remove(req->nbtsock->idr, req->name_trn_id);
+		req->name_trn_id = 0;
+	}
+	TALLOC_FREE(req->te);
+	if (req->nbtsock->send_queue == NULL) {
+		TEVENT_FD_NOT_WRITEABLE(req->nbtsock->fde);
+	}
+	if (req->nbtsock->num_pending == 0 &&
+	    req->nbtsock->incoming.handler == NULL) {
+		TEVENT_FD_NOT_READABLE(req->nbtsock->fde);
+	}
+	return 0;
+}
+
+
+/*
+  handle send events on a nbt name socket
+*/
+static void nbt_name_socket_send(struct nbt_name_socket *nbtsock)
+{
+	struct nbt_name_request *req;
+	TALLOC_CTX *tmp_ctx = talloc_new(nbtsock);
+	NTSTATUS status;
+
+	while ((req = nbtsock->send_queue)) {
+		size_t len;
+
+		len = req->encoded.length;
+		status = socket_sendto(nbtsock->sock, &req->encoded, &len,
+				       req->dest);
+		if (NT_STATUS_IS_ERR(status)) goto failed;
+
+		if (!NT_STATUS_IS_OK(status)) {
+			talloc_free(tmp_ctx);
+			return;
+		}
+
+		DLIST_REMOVE(nbtsock->send_queue, req);
+		req->state = NBT_REQUEST_WAIT;
+		if (req->is_reply) {
+			talloc_free(req);
+		} else {
+			TEVENT_FD_READABLE(nbtsock->fde);
+			nbtsock->num_pending++;
+		}
+	}
+
+	TEVENT_FD_NOT_WRITEABLE(nbtsock->fde);
+	talloc_free(tmp_ctx);
+	return;
+
+failed:
+	DLIST_REMOVE(nbtsock->send_queue, req);
+	nbt_name_request_destructor(req);
+	req->status = status;
+	req->state = NBT_REQUEST_ERROR;
+	talloc_free(tmp_ctx);
+	if (req->async.fn) {
+		req->async.fn(req);
+	} else if (req->is_reply) {
+		talloc_free(req);
+	}
+	return;
+}
+
+
+/*
+  handle a request timeout
+*/
+static void nbt_name_socket_timeout(struct tevent_context *ev, struct tevent_timer *te,
+				    struct timeval t, void *private_data)
+{
+	struct nbt_name_request *req = talloc_get_type(private_data,
+						       struct nbt_name_request);
+
+	if (req->num_retries != 0) {
+		req->num_retries--;
+		req->te = tevent_add_timer(req->nbtsock->event_ctx, req,
+					   timeval_add(&t, req->timeout, 0),
+					   nbt_name_socket_timeout, req);
+		if (req->state != NBT_REQUEST_SEND) {
+			req->state = NBT_REQUEST_SEND;
+			DLIST_ADD_END(req->nbtsock->send_queue, req);
+		}
+		TEVENT_FD_WRITEABLE(req->nbtsock->fde);
+		return;
+	}
+
+	nbt_name_request_destructor(req);
+	if (req->num_replies == 0) {
+		req->state = NBT_REQUEST_TIMEOUT;
+		req->status = NT_STATUS_IO_TIMEOUT;
+	} else {
+		req->state = NBT_REQUEST_DONE;
+		req->status = NT_STATUS_OK;
+	}
+	if (req->async.fn) {
+		req->async.fn(req);
+	} else if (req->is_reply) {
+		talloc_free(req);
+	}
+}
+
+
+
+/**
+  handle recv events on a nbt name socket
+*/
+static void nbt_name_socket_recv(struct nbt_name_socket *nbtsock)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(nbtsock);
+	NTSTATUS status;
+	enum ndr_err_code ndr_err;
+	struct socket_address *src;
+	DATA_BLOB blob;
+	size_t nread, dsize;
+	struct nbt_name_packet *packet;
+	struct nbt_name_request *req;
+
+	status = socket_pending(nbtsock->sock, &dsize);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	/*
+	 * Given a zero length, data_blob_talloc() returns the
+	 * NULL blob {NULL, 0}.
+	 *
+	 * We only want to error return here on a real out of memory condition
+	 * (i.e. dsize != 0, so the UDP packet has data, but the return of the
+	 * allocation failed, so blob.data==NULL).
+	 *
+	 * Given an actual zero length UDP packet having blob.data == NULL
+	 * isn't an out of memory error condition, that's the defined semantics
+	 * of data_blob_talloc() when asked for zero bytes.
+	 *
+	 * We still need to continue to do the zero-length socket_recvfrom()
+	 * read in order to clear the "read pending" condition on the socket.
+	 */
+	blob = data_blob_talloc(tmp_ctx, NULL, dsize);
+	if (blob.data == NULL && dsize != 0) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	status = socket_recvfrom(nbtsock->sock, blob.data, blob.length, &nread,
+				 tmp_ctx, &src);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	packet = talloc(tmp_ctx, struct nbt_name_packet);
+	if (packet == NULL) {
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	/* parse the request */
+	ndr_err = ndr_pull_struct_blob(&blob, packet, packet,
+				       (ndr_pull_flags_fn_t)ndr_pull_nbt_name_packet);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		status = ndr_map_error2ntstatus(ndr_err);
+		DEBUG(2,("Failed to parse incoming NBT name packet - %s\n",
+			 nt_errstr(status)));
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	if (DEBUGLVL(10)) {
+		DEBUG(10,("Received nbt packet of length %d from %s:%d\n",
+			  (int)blob.length, src->addr, src->port));
+		NDR_PRINT_DEBUG(nbt_name_packet, packet);
+	}
+
+	/* if its not a reply then pass it off to the incoming request
+	   handler, if any */
+	if (!(packet->operation & NBT_FLAG_REPLY)) {
+		if (nbtsock->incoming.handler) {
+			nbtsock->incoming.handler(nbtsock, packet, src);
+		}
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	/* find the matching request */
+	req = (struct nbt_name_request *)idr_find(nbtsock->idr,
+						  packet->name_trn_id);
+	if (req == NULL) {
+		if (nbtsock->unexpected.handler) {
+			nbtsock->unexpected.handler(nbtsock, packet, src);
+		} else {
+			DEBUG(10,("Failed to match request for incoming name packet id 0x%04x on %p\n",
+				 packet->name_trn_id, nbtsock));
+		}
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	talloc_steal(req, packet);
+	talloc_steal(req, src);
+	talloc_free(tmp_ctx);
+	nbt_name_socket_handle_response_packet(req, packet, src);
+}
+
+void nbt_name_socket_handle_response_packet(struct nbt_name_request *req,
+					    struct nbt_name_packet *packet,
+					    struct socket_address *src)
+{
+	/* if this is a WACK response, this we need to go back to waiting,
+	   but perhaps increase the timeout */
+	if ((packet->operation & NBT_OPCODE) == NBT_OPCODE_WACK) {
+		uint32_t ttl;
+		if (req->received_wack || packet->ancount < 1) {
+			nbt_name_request_destructor(req);
+			req->status = NT_STATUS_INVALID_NETWORK_RESPONSE;
+			req->state  = NBT_REQUEST_ERROR;
+			goto done;
+		}
+		talloc_free(req->te);
+		/* we know we won't need any more retries - the server
+		   has received our request */
+		req->num_retries   = 0;
+		req->received_wack = true;
+		/*
+		 * there is a timeout in the packet,
+		 * it is 5 + 4 * num_old_addresses
+		 *
+		 * although w2k3 screws it up
+		 * and uses num_old_addresses = 0
+		 *
+		 * so we better fallback to the maximum
+		 * of num_old_addresses = 25 if we got
+		 * a timeout of less than 9s (5 + 4*1)
+		 * or more than 105s (5 + 4*25).
+		 */
+		ttl = packet->answers[0].ttl;
+		if ((ttl < (5 + 4*1)) || (ttl > (5 + 4*25))) {
+			ttl = 5 + 4*25;
+		}
+		req->timeout = ttl;
+		req->te = tevent_add_timer(req->nbtsock->event_ctx, req,
+					   timeval_current_ofs(req->timeout, 0),
+					   nbt_name_socket_timeout, req);
+		return;
+	}
+
+
+	req->replies = talloc_realloc(req, req->replies, struct nbt_name_reply, req->num_replies+1);
+	if (req->replies == NULL) {
+		nbt_name_request_destructor(req);
+		req->state  = NBT_REQUEST_ERROR;
+		req->status = NT_STATUS_NO_MEMORY;
+		goto done;
+	}
+
+	talloc_steal(req, src);
+	req->replies[req->num_replies].dest   = src;
+	talloc_steal(req, packet);
+	req->replies[req->num_replies].packet = packet;
+	req->num_replies++;
+
+	/* if we don't want multiple replies then we are done */
+	if (req->allow_multiple_replies &&
+	    req->num_replies < NBT_MAX_REPLIES) {
+		return;
+	}
+
+	nbt_name_request_destructor(req);
+	req->state  = NBT_REQUEST_DONE;
+	req->status = NT_STATUS_OK;
+
+done:
+	if (req->async.fn) {
+		req->async.fn(req);
+	}
+}
+
+/*
+  handle fd events on a nbt_name_socket
+*/
+static void nbt_name_socket_handler(struct tevent_context *ev, struct tevent_fd *fde,
+				    uint16_t flags, void *private_data)
+{
+	struct nbt_name_socket *nbtsock = talloc_get_type(private_data,
+							  struct nbt_name_socket);
+	if (flags & TEVENT_FD_WRITE) {
+		nbt_name_socket_send(nbtsock);
+	}
+	if (flags & TEVENT_FD_READ) {
+		nbt_name_socket_recv(nbtsock);
+	}
+}
+
+
+/*
+  initialise a nbt_name_socket. The event_ctx is optional, if provided
+  then operations will use that event context
+*/
+_PUBLIC_ struct nbt_name_socket *nbt_name_socket_init(TALLOC_CTX *mem_ctx,
+					     struct tevent_context *event_ctx)
+{
+	struct nbt_name_socket *nbtsock;
+	NTSTATUS status;
+
+	nbtsock = talloc(mem_ctx, struct nbt_name_socket);
+	if (nbtsock == NULL) goto failed;
+
+	nbtsock->event_ctx = event_ctx;
+	if (nbtsock->event_ctx == NULL) goto failed;
+
+	status = socket_create(nbtsock, "ip", SOCKET_TYPE_DGRAM,
+			       &nbtsock->sock, 0);
+	if (!NT_STATUS_IS_OK(status)) goto failed;
+
+	socket_set_option(nbtsock->sock, "SO_BROADCAST", "1");
+
+	nbtsock->idr = idr_init(nbtsock);
+	if (nbtsock->idr == NULL) goto failed;
+
+	nbtsock->send_queue = NULL;
+	nbtsock->num_pending = 0;
+	nbtsock->incoming.handler = NULL;
+	nbtsock->unexpected.handler = NULL;
+
+	nbtsock->fde = tevent_add_fd(nbtsock->event_ctx, nbtsock,
+				     socket_get_fd(nbtsock->sock), 0,
+				     nbt_name_socket_handler, nbtsock);
+
+	return nbtsock;
+
+failed:
+	talloc_free(nbtsock);
+	return NULL;
+}
+
+/*
+  send off a nbt name request
+*/
+struct nbt_name_request *nbt_name_request_send(TALLOC_CTX *mem_ctx,
+					       struct nbt_name_socket *nbtsock,
+					       struct socket_address *dest,
+					       struct nbt_name_packet *request,
+					       int timeout, int retries,
+					       bool allow_multiple_replies)
+{
+	struct nbt_name_request *req;
+	int id;
+	enum ndr_err_code ndr_err;
+
+	req = talloc_zero(mem_ctx, struct nbt_name_request);
+	if (req == NULL) goto failed;
+
+	req->nbtsock                = nbtsock;
+	req->allow_multiple_replies = allow_multiple_replies;
+	req->state                  = NBT_REQUEST_SEND;
+	req->is_reply               = false;
+	req->timeout                = timeout;
+	req->num_retries            = retries;
+	req->dest                   = socket_address_copy(req, dest);
+	if (req->dest == NULL) goto failed;
+
+	/* we select a random transaction id unless the user supplied one */
+	if (request->name_trn_id == 0) {
+		id = idr_get_new_random(req->nbtsock->idr, req, UINT16_MAX);
+	} else {
+		if (idr_find(req->nbtsock->idr, request->name_trn_id)) goto failed;
+		id = idr_get_new_above(req->nbtsock->idr, req, request->name_trn_id,
+				       UINT16_MAX);
+	}
+	if (id == -1) goto failed;
+
+	request->name_trn_id = id;
+	req->name_trn_id     = id;
+
+	req->te = tevent_add_timer(nbtsock->event_ctx, req,
+				   timeval_current_ofs(req->timeout, 0),
+				   nbt_name_socket_timeout, req);
+
+	talloc_set_destructor(req, nbt_name_request_destructor);
+
+	ndr_err = ndr_push_struct_blob(&req->encoded, req,
+				       request,
+				       (ndr_push_flags_fn_t)ndr_push_nbt_name_packet);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) goto failed;
+
+	DLIST_ADD_END(nbtsock->send_queue, req);
+
+	if (DEBUGLVL(10)) {
+		DEBUG(10,("Queueing nbt packet to %s:%d\n",
+			  req->dest->addr, req->dest->port));
+		NDR_PRINT_DEBUG(nbt_name_packet, request);
+	}
+
+	TEVENT_FD_WRITEABLE(nbtsock->fde);
+
+	return req;
+
+failed:
+	talloc_free(req);
+	return NULL;
+}
+
+
+/*
+  send off a nbt name reply
+*/
+_PUBLIC_ NTSTATUS nbt_name_reply_send(struct nbt_name_socket *nbtsock,
+			     struct socket_address *dest,
+			     struct nbt_name_packet *request)
+{
+	struct nbt_name_request *req;
+	enum ndr_err_code ndr_err;
+
+	req = talloc_zero(nbtsock, struct nbt_name_request);
+	NT_STATUS_HAVE_NO_MEMORY(req);
+
+	req->nbtsock   = nbtsock;
+	req->dest = socket_address_copy(req, dest);
+	if (req->dest == NULL) goto failed;
+	req->state     = NBT_REQUEST_SEND;
+	req->is_reply = true;
+
+	talloc_set_destructor(req, nbt_name_request_destructor);
+
+	if (DEBUGLVL(10)) {
+		NDR_PRINT_DEBUG(nbt_name_packet, request);
+	}
+
+	ndr_err = ndr_push_struct_blob(&req->encoded, req,
+				       request,
+				       (ndr_push_flags_fn_t)ndr_push_nbt_name_packet);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(req);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	DLIST_ADD_END(nbtsock->send_queue, req);
+
+	TEVENT_FD_WRITEABLE(nbtsock->fde);
+
+	return NT_STATUS_OK;
+
+failed:
+	talloc_free(req);
+	return NT_STATUS_NO_MEMORY;
+}
+
+/*
+  wait for a nbt request to complete
+*/
+NTSTATUS nbt_name_request_recv(struct nbt_name_request *req)
+{
+	if (!req) return NT_STATUS_NO_MEMORY;
+
+	while (req->state < NBT_REQUEST_DONE) {
+		if (tevent_loop_once(req->nbtsock->event_ctx) != 0) {
+			req->state = NBT_REQUEST_ERROR;
+			req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
+			break;
+		}
+	}
+	return req->status;
+}
+
+
+/*
+  setup a handler for incoming requests
+*/
+_PUBLIC_ NTSTATUS nbt_set_incoming_handler(struct nbt_name_socket *nbtsock,
+				  void (*handler)(struct nbt_name_socket *, struct nbt_name_packet *,
+						  struct socket_address *),
+				  void *private_data)
+{
+	nbtsock->incoming.handler = handler;
+	nbtsock->incoming.private_data = private_data;
+	TEVENT_FD_READABLE(nbtsock->fde);
+	return NT_STATUS_OK;
+}
+
+/*
+  setup a handler for unexpected requests
+*/
+NTSTATUS nbt_set_unexpected_handler(struct nbt_name_socket *nbtsock,
+				    void (*handler)(struct nbt_name_socket *, struct nbt_name_packet *,
+						    struct socket_address *),
+				    void *private_data)
+{
+	nbtsock->unexpected.handler = handler;
+	nbtsock->unexpected.private_data = private_data;
+	TEVENT_FD_READABLE(nbtsock->fde);
+	return NT_STATUS_OK;
+}
+
+/*
+  turn a NBT rcode into a NTSTATUS
+*/
+_PUBLIC_ NTSTATUS nbt_rcode_to_ntstatus(uint8_t rcode)
+{
+	size_t i;
+	struct {
+		enum nbt_rcode rcode;
+		NTSTATUS status;
+	} map[] = {
+		{ NBT_RCODE_FMT, NT_STATUS_INVALID_PARAMETER },
+		{ NBT_RCODE_SVR, NT_STATUS_SERVER_DISABLED },
+		{ NBT_RCODE_NAM, NT_STATUS_OBJECT_NAME_NOT_FOUND },
+		{ NBT_RCODE_IMP, NT_STATUS_NOT_SUPPORTED },
+		{ NBT_RCODE_RFS, NT_STATUS_ACCESS_DENIED },
+		{ NBT_RCODE_ACT, NT_STATUS_ADDRESS_ALREADY_EXISTS },
+		{ NBT_RCODE_CFT, NT_STATUS_CONFLICTING_ADDRESSES }
+	};
+	for (i=0;i<ARRAY_SIZE(map);i++) {
+		if (map[i].rcode == rcode) {
+			return map[i].status;
+		}
+	}
+	return NT_STATUS_UNSUCCESSFUL;
+}