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;
44 req->seqnum = transport->seqnum++;
45 req->status = NT_STATUS_OK;
47 req->next = req->prev = NULL;
51 req->out.allocated = SMB2_HDR_BODY+NBT_HDR_SIZE+body_size;
52 req->out.buffer = talloc_size(req, req->out.allocated);
53 if (req->out.buffer == NULL) {
58 req->out.size = SMB2_HDR_BODY+NBT_HDR_SIZE + body_size;
59 req->out.hdr = req->out.buffer + NBT_HDR_SIZE;
60 req->out.body = req->out.hdr + SMB2_HDR_BODY;
61 req->out.body_size = body_size;
62 req->out.ptr = req->out.body;
64 SIVAL(req->out.hdr, 0, SMB2_MAGIC);
65 SSVAL(req->out.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
66 SSVAL(req->out.hdr, SMB2_HDR_PAD1, 0);
67 SIVAL(req->out.hdr, SMB2_HDR_STATUS, 0);
68 SSVAL(req->out.hdr, SMB2_HDR_OPCODE, opcode);
69 SSVAL(req->out.hdr, SMB2_HDR_PAD2, 0);
70 SIVAL(req->out.hdr, SMB2_HDR_FLAGS, 0);
71 SIVAL(req->out.hdr, SMB2_HDR_UNKNOWN, 0);
72 SBVAL(req->out.hdr, SMB2_HDR_SEQNUM, req->seqnum);
73 SIVAL(req->out.hdr, SMB2_HDR_PID, 0);
74 SIVAL(req->out.hdr, SMB2_HDR_TID, 0);
75 SBVAL(req->out.hdr, SMB2_HDR_UID, 0);
76 memset(req->out.hdr+SMB2_HDR_SIG, 0, 16);
82 initialise a smb2 request for tree operations
84 struct smb2_request *smb2_request_init_tree(struct smb2_tree *tree,
85 uint16_t opcode, uint32_t body_size)
87 struct smb2_request *req = smb2_request_init(tree->session->transport, opcode,
89 if (req == NULL) return NULL;
91 SBVAL(req->out.hdr, SMB2_HDR_UID, tree->session->uid);
92 SIVAL(req->out.hdr, SMB2_HDR_TID, tree->tid);
93 req->session = tree->session;
99 /* destroy a request structure and return final status */
100 NTSTATUS smb2_request_destroy(struct smb2_request *req)
104 /* this is the error code we give the application for when a
105 _send() call fails completely */
106 if (!req) return NT_STATUS_UNSUCCESSFUL;
108 if (req->transport) {
109 /* remove it from the list of pending requests (a null op if
110 its not in the list) */
111 DLIST_REMOVE(req->transport->pending_recv, req);
114 if (req->state == SMBCLI_REQUEST_ERROR &&
115 NT_STATUS_IS_OK(req->status)) {
116 req->status = NT_STATUS_INTERNAL_ERROR;
119 status = req->status;
125 receive a response to a packet
127 BOOL smb2_request_receive(struct smb2_request *req)
129 /* req can be NULL when a send has failed. This eliminates lots of NULL
130 checks in each module */
131 if (!req) return False;
133 /* keep receiving packets until this one is replied to */
134 while (req->state <= SMB2_REQUEST_RECV) {
135 if (event_loop_once(req->transport->socket->event.ctx) != 0) {
140 return req->state == SMB2_REQUEST_DONE;
143 /* Return true if the last packet was in error */
144 BOOL smb2_request_is_error(struct smb2_request *req)
146 return NT_STATUS_IS_ERR(req->status);
150 check if a range in the reply body is out of bounds
152 BOOL smb2_oob_in(struct smb2_request *req, const uint8_t *ptr, uint_t size)
154 /* be careful with wraparound! */
155 if (ptr < req->in.body ||
156 ptr >= req->in.body + req->in.body_size ||
157 size > req->in.body_size ||
158 ptr + size > req->in.body + req->in.body_size) {
165 check if a range in the outgoing body is out of bounds
167 BOOL smb2_oob_out(struct smb2_request *req, const uint8_t *ptr, uint_t size)
169 /* be careful with wraparound! */
170 if (ptr < req->out.body ||
171 ptr >= req->out.body + req->out.body_size ||
172 size > req->out.body_size ||
173 ptr + size > req->out.body + req->out.body_size) {
180 pull a data blob from the body of a reply
182 DATA_BLOB smb2_pull_blob(struct smb2_request *req, uint8_t *ptr, uint_t size)
184 if (smb2_oob_in(req, ptr, size)) {
185 return data_blob(NULL, 0);
187 return data_blob_talloc(req, ptr, size);
191 pull a ofs/length/blob triple into a data blob
192 the ptr points to the start of the offset/length pair
194 NTSTATUS smb2_pull_ofs_blob(struct smb2_request *req, uint8_t *ptr, DATA_BLOB *blob)
197 if (smb2_oob_in(req, ptr, 4)) {
198 return NT_STATUS_BUFFER_TOO_SMALL;
202 if (smb2_oob_in(req, req->in.hdr + ofs, size)) {
203 return NT_STATUS_BUFFER_TOO_SMALL;
205 *blob = data_blob_talloc(req, req->in.hdr+ofs, size);
206 NT_STATUS_HAVE_NO_MEMORY(blob->data);
211 push a ofs/length/blob triple into a data blob
212 the ptr points to the start of the offset/length pair
214 NOTE: assumes blob goes immediately after the offset/length pair. Needs
217 NTSTATUS smb2_push_ofs_blob(struct smb2_request *req, uint8_t *ptr, DATA_BLOB blob)
219 if (smb2_oob_out(req, ptr, 4+blob.length)) {
220 return NT_STATUS_BUFFER_TOO_SMALL;
222 SSVAL(ptr, 0, 4 + (ptr - req->out.hdr));
223 SSVAL(ptr, 2, blob.length);
224 memcpy(ptr+4, blob.data, blob.length);
229 pull a string in a ofs/length/blob format
231 NTSTATUS smb2_pull_ofs_string(struct smb2_request *req, uint8_t *ptr,
238 status = smb2_pull_ofs_blob(req, ptr, &blob);
239 NT_STATUS_NOT_OK_RETURN(status);
240 size = convert_string_talloc(req, CH_UTF16, CH_UNIX,
241 blob.data, blob.length, &vstr);
242 data_blob_free(&blob);
245 return NT_STATUS_ILLEGAL_CHARACTER;
251 create a UTF16 string in a blob from a char*
253 NTSTATUS smb2_string_blob(TALLOC_CTX *mem_ctx, const char *str, DATA_BLOB *blob)
256 size = convert_string_talloc(mem_ctx, CH_UNIX, CH_UTF16,
257 str, strlen(str), (void **)&blob->data);
259 return NT_STATUS_ILLEGAL_CHARACTER;