2 Unix SMB/CIFS implementation.
4 manipulate nbt name structures
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 see rfc1002 for the detailed format of compressed names
28 #include "librpc/gen_ndr/ndr_nbt.h"
30 /* don't allow an unlimited number of name components */
31 #define MAX_COMPONENTS 10
34 pull one component of a compressed name
36 static NTSTATUS ndr_pull_component(struct ndr_pull *ndr, uint8_t **component,
37 uint32_t *offset, uint32_t *max_offset)
42 if (*offset >= ndr->data_size) {
43 return NT_STATUS_BAD_NETWORK_NAME;
45 len = ndr->data[*offset];
48 *max_offset = MAX(*max_offset, *offset);
52 if ((len & 0xC0) == 0xC0) {
53 /* its a label pointer */
54 if (1 + *offset >= ndr->data_size) {
55 return NT_STATUS_BAD_NETWORK_NAME;
57 *offset = ((len&0x3F)<<8) | ndr->data[1 + *offset];
58 *max_offset = MAX(*max_offset, *offset + 1);
62 if ((len & 0xC0) != 0) {
63 /* its a reserved length field */
64 return NT_STATUS_BAD_NETWORK_NAME;
66 if (*offset + len + 2 > ndr->data_size) {
67 return NT_STATUS_BAD_NETWORK_NAME;
69 *component = (uint8_t*)talloc_strndup(ndr, &ndr->data[1 + *offset], len);
70 NT_STATUS_HAVE_NO_MEMORY(*component);
72 *max_offset = MAX(*max_offset, *offset);
76 /* too many pointers */
77 return NT_STATUS_BAD_NETWORK_NAME;
81 decompress a 'compressed' name component
83 static NTSTATUS decompress_name(char *name, enum nbt_name_type *type)
86 for (i=0;name[2*i];i++) {
87 uint8_t c1 = name[2*i];
88 uint8_t c2 = name[1+(2*i)];
89 if (c1 < 'A' || c1 > 'P' ||
90 c2 < 'A' || c2 > 'P') {
91 return NT_STATUS_BAD_NETWORK_NAME;
93 name[i] = ((c1-'A')<<4) | (c2-'A');
97 *type = (enum nbt_name_type)(name[15]);
101 *type = NBT_NAME_CLIENT;
104 /* trim trailing spaces */
105 for (;i>0 && name[i-1]==' ';i--) {
114 compress a name component
116 static uint8_t *compress_name(TALLOC_CTX *mem_ctx,
117 uint8_t *name, enum nbt_name_type type)
123 if (strlen(name) > 15) {
127 cname = talloc_array(mem_ctx, uint8_t, 33);
128 if (cname == NULL) return NULL;
130 for (i=0;name[i];i++) {
131 cname[2*i] = 'A' + (name[i]>>4);
132 cname[1+2*i] = 'A' + (name[i]&0xF);
134 if (name[0] == '*') {
140 cname[2*i] = 'A' + (pad_char>>4);
141 cname[1+2*i] = 'A' + (pad_char&0xF);
145 cname[2*i] = 'A' + (pad_char>>4);
146 cname[1+2*i] = 'A' + (pad_char&0xF);
153 pull a nbt name from the wire
155 NTSTATUS ndr_pull_nbt_name(struct ndr_pull *ndr, int ndr_flags, struct nbt_name *r)
158 uint_t num_components;
159 uint32_t offset = ndr->offset;
160 uint32_t max_offset = offset;
161 uint8_t *components[MAX_COMPONENTS];
165 if (!(ndr_flags & NDR_SCALARS)) {
169 /* break up name into a list of components */
170 for (num_components=0;num_components<MAX_COMPONENTS;num_components++) {
171 status = ndr_pull_component(ndr, &components[num_components],
172 &offset, &max_offset);
173 NT_STATUS_NOT_OK_RETURN(status);
174 if (components[num_components] == NULL) break;
176 if (num_components == MAX_COMPONENTS ||
177 num_components == 0) {
178 return NT_STATUS_BAD_NETWORK_NAME;
181 ndr->offset = max_offset;
183 /* the first component is limited to 16 bytes in the DOS charset,
184 which is 32 in the 'compressed' form */
185 if (strlen(components[0]) > 32) {
186 return NT_STATUS_BAD_NETWORK_NAME;
189 /* decompress the first component */
190 status = decompress_name(components[0], &r->type);
191 NT_STATUS_NOT_OK_RETURN(status);
193 r->name = components[0];
195 /* combine the remaining components into the scope */
196 scope = components[1];
197 for (i=2;i<num_components;i++) {
198 scope = talloc_asprintf_append(scope, ".%s", components[i]);
199 NT_STATUS_HAVE_NO_MEMORY(scope);
208 push a nbt name to the wire
210 NTSTATUS ndr_push_nbt_name(struct ndr_push *ndr, int ndr_flags, struct nbt_name *r)
212 uint_t num_components;
213 uint8_t *components[MAX_COMPONENTS];
214 char *dname, *dscope=NULL, *p;
218 if (!(ndr_flags & NDR_SCALARS)) {
222 dname = strupper_talloc(ndr, r->name);
223 NT_STATUS_HAVE_NO_MEMORY(dname);
225 dscope = strupper_talloc(ndr, r->scope);
226 NT_STATUS_HAVE_NO_MEMORY(dscope);
229 cname = compress_name(ndr, dname, r->type);
230 NT_STATUS_HAVE_NO_MEMORY(cname);
232 /* form the base components */
233 components[0] = cname;
236 while (dscope && (p=strchr(dscope, '.')) &&
237 num_components < MAX_COMPONENTS) {
239 components[num_components] = dscope;
243 if (dscope && num_components < MAX_COMPONENTS) {
244 components[num_components++] = dscope;
246 if (num_components == MAX_COMPONENTS) {
247 return NT_STATUS_BAD_NETWORK_NAME;
250 /* push the components */
251 for (i=0;i<num_components;i++) {
252 uint8_t len = strlen(components[i]);
253 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, len));
254 NDR_CHECK(ndr_push_bytes(ndr, components[i], len));
256 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 0));
263 copy a nbt name structure
265 NTSTATUS nbt_name_dup(TALLOC_CTX *mem_ctx, struct nbt_name *name, struct nbt_name *newname)
268 newname->name = talloc_strdup(mem_ctx, newname->name);
269 NT_STATUS_HAVE_NO_MEMORY(newname->name);
270 newname->scope = talloc_strdup(mem_ctx, newname->scope);
272 NT_STATUS_HAVE_NO_MEMORY(newname->scope);
278 push a nbt name into a blob
280 NTSTATUS nbt_name_to_blob(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, struct nbt_name *name)
282 return ndr_push_struct_blob(blob, mem_ctx, name,
283 (ndr_push_flags_fn_t)ndr_push_nbt_name);
288 pull a nbt name from a blob
290 NTSTATUS nbt_name_from_blob(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, struct nbt_name *name)
292 return ndr_pull_struct_blob(blob, mem_ctx, name,
293 (ndr_pull_flags_fn_t)ndr_pull_nbt_name);
298 choose a name to use when calling a server in a NBT session request.
299 we use heuristics to see if the name we have been given is a IP
300 address, or a too-long name. If it is then use *SMBSERVER, or a
303 void nbt_choose_called_name(TALLOC_CTX *mem_ctx,
304 struct nbt_name *n, const char *name, int type)
309 if (is_ipaddress(name)) {
310 n->name = "*SMBSERVER";
313 if (strlen(name) > 15) {
314 const char *p = strchr(name, '.');
316 n->name = "*SMBSERVER";
319 n->name = talloc_strndup(mem_ctx, name, PTR_DIFF(p, name));
323 n->name = talloc_strdup(mem_ctx, name);