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 SBVAL(req->out.hdr, SMB2_HDR_UID, 0);
74 memset(req->out.hdr+SMB2_HDR_SIG, 0, 16);
80 initialise a smb2 request for tree operations
82 struct smb2_request *smb2_request_init_tree(struct smb2_tree *tree,
83 uint16_t opcode, uint32_t body_size)
85 struct smb2_request *req = smb2_request_init(tree->session->transport, opcode,
87 if (req == NULL) return NULL;
89 SBVAL(req->out.hdr, SMB2_HDR_UID, tree->session->uid);
90 SIVAL(req->out.hdr, SMB2_HDR_TID, tree->tid);
95 /* destroy a request structure and return final status */
96 NTSTATUS smb2_request_destroy(struct smb2_request *req)
100 /* this is the error code we give the application for when a
101 _send() call fails completely */
102 if (!req) return NT_STATUS_UNSUCCESSFUL;
104 if (req->transport) {
105 /* remove it from the list of pending requests (a null op if
106 its not in the list) */
107 DLIST_REMOVE(req->transport->pending_recv, req);
110 if (req->state == SMBCLI_REQUEST_ERROR &&
111 NT_STATUS_IS_OK(req->status)) {
112 req->status = NT_STATUS_INTERNAL_ERROR;
115 status = req->status;
121 receive a response to a packet
123 BOOL smb2_request_receive(struct smb2_request *req)
125 /* req can be NULL when a send has failed. This eliminates lots of NULL
126 checks in each module */
127 if (!req) return False;
129 /* keep receiving packets until this one is replied to */
130 while (req->state <= SMB2_REQUEST_RECV) {
131 if (event_loop_once(req->transport->socket->event.ctx) != 0) {
136 return req->state == SMB2_REQUEST_DONE;
139 /* Return true if the last packet was in error */
140 BOOL smb2_request_is_error(struct smb2_request *req)
142 return NT_STATUS_IS_ERR(req->status);
146 check if a range in the reply body is out of bounds
148 BOOL smb2_oob_in(struct smb2_request *req, const uint8_t *ptr, uint_t size)
150 /* be careful with wraparound! */
151 if (ptr < req->in.body ||
152 ptr >= req->in.body + req->in.body_size ||
153 size > req->in.body_size ||
154 ptr + size > req->in.body + req->in.body_size) {
161 check if a range in the outgoing body is out of bounds
163 BOOL smb2_oob_out(struct smb2_request *req, const uint8_t *ptr, uint_t size)
165 /* be careful with wraparound! */
166 if (ptr < req->out.body ||
167 ptr >= req->out.body + req->out.body_size ||
168 size > req->out.body_size ||
169 ptr + size > req->out.body + req->out.body_size) {
176 pull a data blob from the body of a reply
178 DATA_BLOB smb2_pull_blob(struct smb2_request *req, uint8_t *ptr, uint_t size)
180 if (smb2_oob_in(req, ptr, size)) {
181 return data_blob(NULL, 0);
183 return data_blob_talloc(req, ptr, size);
187 pull a ofs/length/blob triple into a data blob
188 the ptr points to the start of the offset/length pair
190 NTSTATUS smb2_pull_ofs_blob(struct smb2_request *req, uint8_t *ptr, DATA_BLOB *blob)
193 if (smb2_oob_in(req, ptr, 4)) {
194 return NT_STATUS_BUFFER_TOO_SMALL;
198 if (smb2_oob_in(req, req->in.hdr + ofs, size)) {
199 return NT_STATUS_BUFFER_TOO_SMALL;
201 *blob = data_blob_talloc(req, req->in.hdr+ofs, size);
202 NT_STATUS_HAVE_NO_MEMORY(blob->data);
207 push a ofs/length/blob triple into a data blob
208 the ptr points to the start of the offset/length pair
210 NOTE: assumes blob goes immediately after the offset/length pair. Needs
213 NTSTATUS smb2_push_ofs_blob(struct smb2_request *req, uint8_t *ptr, DATA_BLOB blob)
215 if (smb2_oob_out(req, ptr, 4+blob.length)) {
216 return NT_STATUS_BUFFER_TOO_SMALL;
218 SSVAL(ptr, 0, 4 + (ptr - req->out.hdr));
219 SSVAL(ptr, 2, blob.length);
220 memcpy(ptr+4, blob.data, blob.length);
225 pull a string in a ofs/length/blob format
227 NTSTATUS smb2_pull_ofs_string(struct smb2_request *req, uint8_t *ptr,
234 status = smb2_pull_ofs_blob(req, ptr, &blob);
235 NT_STATUS_NOT_OK_RETURN(status);
236 size = convert_string_talloc(req, CH_UTF16, CH_UNIX,
237 blob.data, blob.length, &vstr);
238 data_blob_free(&blob);
241 return NT_STATUS_ILLEGAL_CHARACTER;
247 create a UTF16 string in a blob from a char*
249 NTSTATUS smb2_string_blob(TALLOC_CTX *mem_ctx, const char *str, DATA_BLOB *blob)
252 size = convert_string_talloc(mem_ctx, CH_UNIX, CH_UTF16,
253 str, strlen(str), (void **)&blob->data);
255 return NT_STATUS_ILLEGAL_CHARACTER;