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 "system/iconv.h"
29 #include "librpc/gen_ndr/ndr_nbt.h"
31 /* don't allow an unlimited number of name components */
32 #define MAX_COMPONENTS 10
35 pull one component of a compressed name
37 static NTSTATUS ndr_pull_component(struct ndr_pull *ndr, uint8_t **component,
38 uint32_t *offset, uint32_t *max_offset)
43 if (*offset >= ndr->data_size) {
44 return NT_STATUS_BAD_NETWORK_NAME;
46 len = ndr->data[*offset];
49 *max_offset = MAX(*max_offset, *offset);
53 if ((len & 0xC0) == 0xC0) {
54 /* its a label pointer */
55 if (1 + *offset >= ndr->data_size) {
56 return NT_STATUS_BAD_NETWORK_NAME;
58 *max_offset = MAX(*max_offset, *offset + 2);
59 *offset = ((len&0x3F)<<8) | ndr->data[1 + *offset];
60 *max_offset = MAX(*max_offset, *offset);
64 if ((len & 0xC0) != 0) {
65 /* its a reserved length field */
66 return NT_STATUS_BAD_NETWORK_NAME;
68 if (*offset + len + 2 > ndr->data_size) {
69 return NT_STATUS_BAD_NETWORK_NAME;
71 *component = (uint8_t*)talloc_strndup(ndr, &ndr->data[1 + *offset], len);
72 NT_STATUS_HAVE_NO_MEMORY(*component);
74 *max_offset = MAX(*max_offset, *offset);
78 /* too many pointers */
79 return NT_STATUS_BAD_NETWORK_NAME;
83 decompress a 'compressed' name component
85 static NTSTATUS decompress_name(char *name, enum nbt_name_type *type)
88 for (i=0;name[2*i];i++) {
89 uint8_t c1 = name[2*i];
90 uint8_t c2 = name[1+(2*i)];
91 if (c1 < 'A' || c1 > 'P' ||
92 c2 < 'A' || c2 > 'P') {
93 return NT_STATUS_BAD_NETWORK_NAME;
95 name[i] = ((c1-'A')<<4) | (c2-'A');
99 *type = (enum nbt_name_type)(name[15]);
103 *type = NBT_NAME_CLIENT;
106 /* trim trailing spaces */
107 for (;i>0 && name[i-1]==' ';i--) {
116 compress a name component
118 static uint8_t *compress_name(TALLOC_CTX *mem_ctx,
119 const uint8_t *name, enum nbt_name_type type)
125 if (strlen(name) > 15) {
129 cname = talloc_array(mem_ctx, uint8_t, 33);
130 if (cname == NULL) return NULL;
132 for (i=0;name[i];i++) {
133 cname[2*i] = 'A' + (name[i]>>4);
134 cname[1+2*i] = 'A' + (name[i]&0xF);
136 if (strcmp(name, "*") == 0) {
142 cname[2*i] = 'A' + (pad_char>>4);
143 cname[1+2*i] = 'A' + (pad_char&0xF);
147 cname[2*i] = 'A' + (pad_char>>4);
148 cname[1+2*i] = 'A' + (pad_char&0xF);
155 pull a nbt name from the wire
157 NTSTATUS ndr_pull_nbt_name(struct ndr_pull *ndr, int ndr_flags, struct nbt_name *r)
160 uint_t num_components;
161 uint32_t offset = ndr->offset;
162 uint32_t max_offset = offset;
163 uint8_t *components[MAX_COMPONENTS];
167 if (!(ndr_flags & NDR_SCALARS)) {
171 /* break up name into a list of components */
172 for (num_components=0;num_components<MAX_COMPONENTS;num_components++) {
173 status = ndr_pull_component(ndr, &components[num_components],
174 &offset, &max_offset);
175 NT_STATUS_NOT_OK_RETURN(status);
176 if (components[num_components] == NULL) break;
178 if (num_components == MAX_COMPONENTS ||
179 num_components == 0) {
180 return NT_STATUS_BAD_NETWORK_NAME;
183 ndr->offset = max_offset;
185 /* the first component is limited to 16 bytes in the DOS charset,
186 which is 32 in the 'compressed' form */
187 if (strlen(components[0]) > 32) {
188 return NT_STATUS_BAD_NETWORK_NAME;
191 /* decompress the first component */
192 status = decompress_name(components[0], &r->type);
193 NT_STATUS_NOT_OK_RETURN(status);
195 r->name = components[0];
197 /* combine the remaining components into the scope */
198 scope = components[1];
199 for (i=2;i<num_components;i++) {
200 scope = talloc_asprintf_append(scope, ".%s", components[i]);
201 NT_STATUS_HAVE_NO_MEMORY(scope);
210 push a nbt name to the wire
212 NTSTATUS ndr_push_nbt_name(struct ndr_push *ndr, int ndr_flags, struct nbt_name *r)
214 uint_t num_components;
215 uint8_t *components[MAX_COMPONENTS];
216 char *dscope=NULL, *p;
220 if (!(ndr_flags & NDR_SCALARS)) {
225 dscope = talloc_strdup(ndr, r->scope);
226 NT_STATUS_HAVE_NO_MEMORY(dscope);
229 cname = compress_name(ndr, r->name, 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, '.');
317 n->name = "*SMBSERVER";
320 s = talloc_strndup(mem_ctx, name, PTR_DIFF(p, name));
321 n->name = strupper_talloc(mem_ctx, s);
325 n->name = strupper_talloc(mem_ctx, name);
330 escape a string into a form containing only a small set of characters,
331 the rest is hex encoded. This is similar to URL encoding
333 static const char *nbt_hex_encode(TALLOC_CTX *mem_ctx, const char *s)
337 const char *valid_chars = "_-.$@";
339 for (len=i=0;s[i];i++,len++) {
340 if (!isalnum(s[i]) && !strchr(valid_chars, s[i])) {
345 ret = talloc_array(mem_ctx, char, len+1);
346 if (ret == NULL) return NULL;
348 for (len=i=0;s[i];i++) {
349 if (isalnum(s[i]) || strchr(valid_chars, s[i])) {
352 snprintf(&ret[len], 4, "%%%02x", (unsigned char)s[i]);
363 form a string for a NBT name
365 char *nbt_name_string(TALLOC_CTX *mem_ctx, const struct nbt_name *name)
367 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
370 ret = talloc_asprintf(mem_ctx, "%s<%02x>-%s",
371 nbt_hex_encode(tmp_ctx, name->name),
373 nbt_hex_encode(tmp_ctx, name->scope));
375 ret = talloc_asprintf(mem_ctx, "%s<%02x>",
376 nbt_hex_encode(tmp_ctx, name->name),
379 talloc_free(tmp_ctx);