1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
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);
EVENT_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)
{
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);
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;
}
/*
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,
const char *dest_address,
int dest_port,
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;
NTSTATUS status;
if (dest_port == 0) {
dest_port = lp_dgram_port();
}
ZERO_STRUCT(packet);
packet.msg_type = msg_type;
packet.flags = DGRAM_FLAG_FIRST | DGRAM_NODE_NBDD;
packet.dgram_id = generate_random() % UINT16_MAX;
packet.source = socket_get_my_addr(dgmsock->sock, tmp_ctx);
packet.src_port = socket_get_my_port(dgmsock->sock);
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_address, dest_port);
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;
}
|
