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, 229 insertions, 0 deletions

diff --git a/source4/libcli/dgram/mailslot.c b/source4/libcli/dgram/mailslot.c
new file mode 100644
index 0000000..a24800c
--- /dev/null
+++ b/source4/libcli/dgram/mailslot.c
@@ -0,0 +1,229 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   packet handling for mailslot 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/>.
+*/
+
+/*
+   This implements "Class 2 mailslots", i.e. the communication mechanism 
+   used for all mailslot packets smaller than 425 bytes. 
+
+   "Class 1 mailslots" (which use SMB) are used for messages larger 
+   than 426 bytes and are supported on some systems. These are not implemented
+   in Samba4 yet, as there don't appear to be any core services that use
+   them.
+
+   425 and 426-byte sized messages are not supported at all.
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "../lib/util/dlinklist.h"
+#include "libcli/dgram/libdgram.h"
+#include "lib/socket/socket.h"
+
+#undef strcasecmp
+
+/*
+  destroy a mailslot handler
+*/
+static int dgram_mailslot_destructor(struct dgram_mailslot_handler *dgmslot)
+{
+	DLIST_REMOVE(dgmslot->dgmsock->mailslot_handlers, dgmslot);
+	return 0;
+}
+
+/*
+  start listening on a mailslot. talloc_free() the handle to stop listening
+*/
+struct dgram_mailslot_handler *dgram_mailslot_listen(struct nbt_dgram_socket *dgmsock,
+						     const char *mailslot_name,
+						     dgram_mailslot_handler_t handler,
+						     void *private_data)
+{
+	struct dgram_mailslot_handler *dgmslot;
+
+	dgmslot = talloc(dgmsock, struct dgram_mailslot_handler);
+	if (dgmslot == NULL) return NULL;
+
+	dgmslot->dgmsock = dgmsock;
+	dgmslot->mailslot_name = talloc_strdup(dgmslot, mailslot_name);
+	if (dgmslot->mailslot_name == NULL) {
+		talloc_free(dgmslot);
+		return NULL;
+	}
+	dgmslot->handler = handler;
+	dgmslot->private_data = private_data;
+
+	DLIST_ADD(dgmsock->mailslot_handlers, dgmslot);
+	talloc_set_destructor(dgmslot, dgram_mailslot_destructor);
+
+	TEVENT_FD_READABLE(dgmsock->fde);
+
+	return dgmslot;
+}
+
+/*
+  find the handler for a specific mailslot name
+*/
+struct dgram_mailslot_handler *dgram_mailslot_find(struct nbt_dgram_socket *dgmsock,
+						   const char *mailslot_name)
+{
+	struct dgram_mailslot_handler *h;
+	for (h=dgmsock->mailslot_handlers;h;h=h->next) {
+		if (strcasecmp(h->mailslot_name, mailslot_name) == 0) {
+			return h;
+		}
+	}
+	return NULL;
+}
+
+/*
+  check that a datagram packet is a valid mailslot request, and return the 
+  mailslot name if it is, otherwise return NULL
+*/
+const char *dgram_mailslot_name(struct nbt_dgram_packet *packet)
+{
+	if (packet->msg_type != DGRAM_DIRECT_UNIQUE &&
+	    packet->msg_type != DGRAM_DIRECT_GROUP &&
+	    packet->msg_type != DGRAM_BCAST) {
+		return NULL;
+	}
+	if (packet->data.msg.dgram_body_type != DGRAM_SMB) return NULL;
+	if (packet->data.msg.body.smb.smb_command != SMB_TRANSACTION) return NULL;
+	return packet->data.msg.body.smb.body.trans.mailslot_name;
+}
+
+
+/*
+  create a temporary mailslot handler for a reply mailslot, allocating
+  a new mailslot name using the given base name and a random integer extension
+*/
+struct dgram_mailslot_handler *dgram_mailslot_temp(struct nbt_dgram_socket *dgmsock,
+						   const char *mailslot_name,
+						   dgram_mailslot_handler_t handler,
+						   void *private_data)
+{
+	char *name;
+	int i;
+	struct dgram_mailslot_handler *dgmslot;
+
+	/* try a 100 times at most */
+	for (i=0;i<100;i++) {
+		name = talloc_asprintf(dgmsock, "%s%03u", 
+				       mailslot_name,
+				       generate_random() % 1000);
+		if (name == NULL) return NULL;
+		if (dgram_mailslot_find(dgmsock, name)) {
+			talloc_free(name);
+			continue;
+		}
+		dgmslot = dgram_mailslot_listen(dgmsock, name, handler, private_data);
+		talloc_free(name);
+		if (dgmslot != NULL) {
+			return dgmslot;
+		}
+	}
+	DEBUG(2,("Unable to create temporary mailslot from %s\n", mailslot_name));
+	return NULL;
+}
+
+
+/*
+  send a mailslot request
+*/
+NTSTATUS dgram_mailslot_send(struct nbt_dgram_socket *dgmsock,
+			     enum dgram_msg_type msg_type,
+			     const char *mailslot_name,
+			     struct nbt_name *dest_name,
+			     struct socket_address *dest,
+			     struct nbt_name *src_name,
+			     DATA_BLOB *request)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(dgmsock);
+	struct nbt_dgram_packet packet;
+	struct dgram_message *msg;
+	struct dgram_smb_packet *smb;
+	struct smb_trans_body *trans;
+	struct socket_address *src;
+	NTSTATUS status;
+
+	if (dest->port == 0) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	ZERO_STRUCT(packet);
+	packet.msg_type = msg_type;
+	packet.flags = DGRAM_FLAG_FIRST | DGRAM_NODE_NBDD;
+	packet.dgram_id = generate_random() % UINT16_MAX;
+	src = socket_get_my_addr(dgmsock->sock, tmp_ctx);
+	if (!src) {
+		talloc_free(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+	packet.src_addr = src->addr;
+	packet.src_port = src->port;
+
+	msg = &packet.data.msg;
+	/* this length calculation is very crude - it should be based on gensize
+	   calls */
+	msg->length = 138 + strlen(mailslot_name) + request->length;
+	msg->offset = 0;
+
+	msg->source_name = *src_name;
+	msg->dest_name = *dest_name;
+	msg->dgram_body_type = DGRAM_SMB;
+
+	smb = &msg->body.smb;
+	smb->smb_command = SMB_TRANSACTION;
+
+	trans = &smb->body.trans;
+	trans->total_data_count = request->length;
+	trans->timeout     = 1000;
+	trans->data_count  = request->length;
+	trans->data_offset = 70 + strlen(mailslot_name);
+	trans->opcode      = 1; /* write mail slot */
+	trans->priority    = 1;
+	trans->_class      = 2;
+	trans->mailslot_name = mailslot_name;
+	trans->data = *request;
+
+	status = nbt_dgram_send(dgmsock, &packet, dest);
+
+	talloc_free(tmp_ctx);
+
+	return status;
+}
+
+/*
+  return the mailslot data portion from a mailslot packet
+*/
+DATA_BLOB dgram_mailslot_data(struct nbt_dgram_packet *dgram)
+{
+	struct smb_trans_body *trans = &dgram->data.msg.body.smb.body.trans;
+	DATA_BLOB ret = trans->data;
+	int pad = trans->data_offset - (70 + strlen(trans->mailslot_name));
+
+	if (pad < 0 || pad > ret.length) {
+		DEBUG(2,("Badly formatted data in mailslot - pad = %d\n", pad));
+		return data_blob(NULL, 0);
+	}
+	ret.data += pad;
+	ret.length -= pad;
+	return ret;	
+}