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/*
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 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"
/*
destroy a mailslot handler
*/
static int dgram_mailslot_destructor(void *ptr)
{
struct dgram_mailslot_handler *dgmslot =
talloc_get_type(ptr, struct dgram_mailslot_handler);
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)
{
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 = private;
DLIST_ADD(dgmsock->mailslot_handlers, dgmslot);
talloc_set_destructor(dgmslot, dgram_mailslot_destructor);
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;
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)
{
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%u",
mailslot_name,
generate_random() % UINT16_MAX);
if (name == NULL) return NULL;
if (dgram_mailslot_find(dgmsock, name)) {
talloc_free(name);
return NULL;
}
dgmslot = dgram_mailslot_listen(dgmsock, name, handler, private);
talloc_free(name);
return dgmslot;
}
DEBUG(2,("Unable to create temporary mailslot from %s\n", mailslot_name));
return NULL;
}
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