2 Unix SMB/CIFS implementation.
4 SMB2 client request handling
6 Copyright (C) Andrew Tridgell 2005
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "libcli/raw/libcliraw.h"
25 #include "libcli/smb2/smb2.h"
26 #include "include/dlinklist.h"
27 #include "lib/events/events.h"
30 initialise a smb2 request
32 struct smb2_request *smb2_request_init(struct smb2_transport *transport,
33 uint16_t opcode, uint32_t body_size)
35 struct smb2_request *req;
37 req = talloc(transport, struct smb2_request);
38 if (req == NULL) return NULL;
40 req->state = SMB2_REQUEST_INIT;
41 req->transport = transport;
42 req->seqnum = transport->seqnum++;
43 req->status = NT_STATUS_OK;
45 req->next = req->prev = NULL;
49 req->out.allocated = SMB2_HDR_BODY+NBT_HDR_SIZE+body_size;
50 req->out.buffer = talloc_size(req, req->out.allocated);
51 if (req->out.buffer == NULL) {
56 req->out.size = SMB2_HDR_BODY+NBT_HDR_SIZE + body_size;
57 req->out.hdr = req->out.buffer + NBT_HDR_SIZE;
58 req->out.body = req->out.hdr + SMB2_HDR_BODY;
59 req->out.body_size = body_size;
60 req->out.ptr = req->out.body;
62 SIVAL(req->out.hdr, 0, SMB2_MAGIC);
63 SSVAL(req->out.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
64 SSVAL(req->out.hdr, SMB2_HDR_PAD1, 0);
65 SIVAL(req->out.hdr, SMB2_HDR_STATUS, 0);
66 SSVAL(req->out.hdr, SMB2_HDR_OPCODE, opcode);
67 SSVAL(req->out.hdr, SMB2_HDR_PAD2, 0);
68 SIVAL(req->out.hdr, SMB2_HDR_FLAGS, 0);
69 SIVAL(req->out.hdr, SMB2_HDR_UNKNOWN, 0);
70 SBVAL(req->out.hdr, SMB2_HDR_SEQNUM, req->seqnum);
71 SIVAL(req->out.hdr, SMB2_HDR_PID, 0);
72 SIVAL(req->out.hdr, SMB2_HDR_TID, 0);
73 SIVAL(req->out.hdr, SMB2_HDR_UID, 0);
74 SIVAL(req->out.hdr, SMB2_HDR_UID2, 0);
75 memset(req->out.hdr+SMB2_HDR_SIG, 0, 16);
80 /* destroy a request structure and return final status */
81 NTSTATUS smb2_request_destroy(struct smb2_request *req)
85 /* this is the error code we give the application for when a
86 _send() call fails completely */
87 if (!req) return NT_STATUS_UNSUCCESSFUL;
90 /* remove it from the list of pending requests (a null op if
91 its not in the list) */
92 DLIST_REMOVE(req->transport->pending_recv, req);
95 if (req->state == SMBCLI_REQUEST_ERROR &&
96 NT_STATUS_IS_OK(req->status)) {
97 req->status = NT_STATUS_INTERNAL_ERROR;
100 status = req->status;
106 receive a response to a packet
108 BOOL smb2_request_receive(struct smb2_request *req)
110 /* req can be NULL when a send has failed. This eliminates lots of NULL
111 checks in each module */
112 if (!req) return False;
114 /* keep receiving packets until this one is replied to */
115 while (req->state <= SMB2_REQUEST_RECV) {
116 if (event_loop_once(req->transport->socket->event.ctx) != 0) {
121 return req->state == SMB2_REQUEST_DONE;
124 /* Return true if the last packet was in error */
125 BOOL smb2_request_is_error(struct smb2_request *req)
127 return NT_STATUS_IS_ERR(req->status);
131 check if a range in the reply body is out of bounds
133 BOOL smb2_oob(struct smb2_request *req, const uint8_t *ptr, uint_t size)
135 /* be careful with wraparound! */
136 if (ptr < req->in.body ||
137 ptr >= req->in.body + req->in.body_size ||
138 size > req->in.body_size ||
139 ptr + size > req->in.body + req->in.body_size) {
146 pull a data blob from the body of a reply
148 DATA_BLOB smb2_pull_blob(struct smb2_request *req, uint8_t *ptr, uint_t size)
150 if (smb2_oob(req, ptr, size)) {
151 return data_blob(NULL, 0);
153 return data_blob_talloc(req, ptr, size);