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samba-mirror/libcli/nbt/nbtname.c
Matt Kraai aa6a507e76 Change uint_t to unsigned int in libcli
Signed-off-by: Stefan Metzmacher <metze@samba.org>
2010-02-02 07:18:17 +01:00

674 lines
17 KiB
C

/*
Unix SMB/CIFS implementation.
manipulate nbt name structures
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
see rfc1002 for the detailed format of compressed names
*/
#include "includes.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "system/locale.h"
/* don't allow an unlimited number of name components */
#define MAX_COMPONENTS 10
/**
print a nbt string
*/
_PUBLIC_ void ndr_print_nbt_string(struct ndr_print *ndr, const char *name, const char *s)
{
ndr_print_string(ndr, name, s);
}
/*
pull one component of a nbt_string
*/
static enum ndr_err_code ndr_pull_component(struct ndr_pull *ndr,
uint8_t **component,
uint32_t *offset,
uint32_t *max_offset)
{
uint8_t len;
unsigned int loops = 0;
while (loops < 5) {
if (*offset >= ndr->data_size) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"BAD NBT NAME component");
}
len = ndr->data[*offset];
if (len == 0) {
*offset += 1;
*max_offset = MAX(*max_offset, *offset);
*component = NULL;
return NDR_ERR_SUCCESS;
}
if ((len & 0xC0) == 0xC0) {
/* its a label pointer */
if (1 + *offset >= ndr->data_size) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"BAD NBT NAME component");
}
*max_offset = MAX(*max_offset, *offset + 2);
*offset = ((len&0x3F)<<8) | ndr->data[1 + *offset];
*max_offset = MAX(*max_offset, *offset);
loops++;
continue;
}
if ((len & 0xC0) != 0) {
/* its a reserved length field */
return ndr_pull_error(ndr, NDR_ERR_STRING,
"BAD NBT NAME component");
}
if (*offset + len + 2 > ndr->data_size) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"BAD NBT NAME component");
}
*component = (uint8_t*)talloc_strndup(ndr, (const char *)&ndr->data[1 + *offset], len);
NDR_ERR_HAVE_NO_MEMORY(*component);
*offset += len + 1;
*max_offset = MAX(*max_offset, *offset);
return NDR_ERR_SUCCESS;
}
/* too many pointers */
return ndr_pull_error(ndr, NDR_ERR_STRING, "BAD NBT NAME component");
}
/**
pull a nbt_string from the wire
*/
_PUBLIC_ enum ndr_err_code ndr_pull_nbt_string(struct ndr_pull *ndr, int ndr_flags, const char **s)
{
uint32_t offset = ndr->offset;
uint32_t max_offset = offset;
unsigned num_components;
char *name;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
name = NULL;
/* break up name into a list of components */
for (num_components=0;num_components<MAX_COMPONENTS;num_components++) {
uint8_t *component = NULL;
NDR_CHECK(ndr_pull_component(ndr, &component, &offset, &max_offset));
if (component == NULL) break;
if (name) {
name = talloc_asprintf_append_buffer(name, ".%s", component);
NDR_ERR_HAVE_NO_MEMORY(name);
} else {
name = (char *)component;
}
}
if (num_components == MAX_COMPONENTS) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"BAD NBT NAME too many components");
}
if (num_components == 0) {
name = talloc_strdup(ndr, "");
NDR_ERR_HAVE_NO_MEMORY(name);
}
(*s) = name;
ndr->offset = max_offset;
return NDR_ERR_SUCCESS;
}
/**
push a nbt string to the wire
*/
_PUBLIC_ enum ndr_err_code ndr_push_nbt_string(struct ndr_push *ndr, int ndr_flags, const char *s)
{
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
while (s && *s) {
enum ndr_err_code ndr_err;
char *compname;
size_t complen;
uint32_t offset;
/* see if we have pushed the remaing string allready,
* if so we use a label pointer to this string
*/
ndr_err = ndr_token_retrieve_cmp_fn(&ndr->nbt_string_list, s, &offset, (comparison_fn_t)strcmp, false);
if (NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
uint8_t b[2];
if (offset > 0x3FFF) {
return ndr_push_error(ndr, NDR_ERR_STRING,
"offset for nbt string label pointer %u[%08X] > 0x00003FFF",
offset, offset);
}
b[0] = 0xC0 | (offset>>8);
b[1] = (offset & 0xFF);
return ndr_push_bytes(ndr, b, 2);
}
complen = strcspn(s, ".");
/* we need to make sure the length fits into 6 bytes */
if (complen > 0x3F) {
return ndr_push_error(ndr, NDR_ERR_STRING,
"component length %u[%08X] > 0x0000003F",
(unsigned)complen, (unsigned)complen);
}
compname = talloc_asprintf(ndr, "%c%*.*s",
(unsigned char)complen,
(unsigned char)complen,
(unsigned char)complen, s);
NDR_ERR_HAVE_NO_MEMORY(compname);
/* remember the current componemt + the rest of the string
* so it can be reused later
*/
NDR_CHECK(ndr_token_store(ndr, &ndr->nbt_string_list, s, ndr->offset));
/* push just this component into the blob */
NDR_CHECK(ndr_push_bytes(ndr, (const uint8_t *)compname, complen+1));
talloc_free(compname);
s += complen;
if (*s == '.') s++;
}
/* if we reach the end of the string and have pushed the last component
* without using a label pointer, we need to terminate the string
*/
return ndr_push_bytes(ndr, (const uint8_t *)"", 1);
}
/*
decompress a 'compressed' name component
*/
static bool decompress_name(char *name, enum nbt_name_type *type)
{
int i;
for (i=0;name[2*i];i++) {
uint8_t c1 = name[2*i];
uint8_t c2 = name[1+(2*i)];
if (c1 < 'A' || c1 > 'P' ||
c2 < 'A' || c2 > 'P') {
return false;
}
name[i] = ((c1-'A')<<4) | (c2-'A');
}
name[i] = 0;
if (i == 16) {
*type = (enum nbt_name_type)(name[15]);
name[15] = 0;
i--;
} else {
*type = NBT_NAME_CLIENT;
}
/* trim trailing spaces */
for (;i>0 && name[i-1]==' ';i--) {
name[i-1] = 0;
}
return true;
}
/*
compress a name component
*/
static uint8_t *compress_name(TALLOC_CTX *mem_ctx,
const uint8_t *name, enum nbt_name_type type)
{
uint8_t *cname;
int i;
uint8_t pad_char;
if (strlen((const char *)name) > 15) {
return NULL;
}
cname = talloc_array(mem_ctx, uint8_t, 33);
if (cname == NULL) return NULL;
for (i=0;name[i];i++) {
cname[2*i] = 'A' + (name[i]>>4);
cname[1+2*i] = 'A' + (name[i]&0xF);
}
if (strcmp((const char *)name, "*") == 0) {
pad_char = 0;
} else {
pad_char = ' ';
}
for (;i<15;i++) {
cname[2*i] = 'A' + (pad_char>>4);
cname[1+2*i] = 'A' + (pad_char&0xF);
}
pad_char = type;
cname[2*i] = 'A' + (pad_char>>4);
cname[1+2*i] = 'A' + (pad_char&0xF);
cname[32] = 0;
return cname;
}
/**
pull a nbt name from the wire
*/
_PUBLIC_ enum ndr_err_code ndr_pull_nbt_name(struct ndr_pull *ndr, int ndr_flags, struct nbt_name *r)
{
uint8_t *scope;
char *cname;
const char *s;
bool ok;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_pull_nbt_string(ndr, ndr_flags, &s));
scope = (uint8_t *)strchr(s, '.');
if (scope) {
*scope = 0;
r->scope = talloc_strdup(ndr->current_mem_ctx, (const char *)&scope[1]);
NDR_ERR_HAVE_NO_MEMORY(r->scope);
} else {
r->scope = NULL;
}
cname = discard_const_p(char, s);
/* the first component is limited to 16 bytes in the DOS charset,
which is 32 in the 'compressed' form */
if (strlen(cname) > 32) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"NBT NAME cname > 32");
}
/* decompress the first component */
ok = decompress_name(cname, &r->type);
if (!ok) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"NBT NAME failed to decompress");
}
r->name = talloc_strdup(ndr->current_mem_ctx, cname);
NDR_ERR_HAVE_NO_MEMORY(r->name);
talloc_free(cname);
return NDR_ERR_SUCCESS;
}
/**
push a nbt name to the wire
*/
_PUBLIC_ enum ndr_err_code ndr_push_nbt_name(struct ndr_push *ndr, int ndr_flags, const struct nbt_name *r)
{
uint8_t *cname, *fullname;
enum ndr_err_code ndr_err;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
if (strlen(r->name) > 15) {
return ndr_push_error(ndr, NDR_ERR_STRING,
"nbt_name longer as 15 chars: %s",
r->name);
}
cname = compress_name(ndr, (const uint8_t *)r->name, r->type);
NDR_ERR_HAVE_NO_MEMORY(cname);
if (r->scope) {
fullname = (uint8_t *)talloc_asprintf(ndr, "%s.%s", cname, r->scope);
NDR_ERR_HAVE_NO_MEMORY(fullname);
talloc_free(cname);
} else {
fullname = cname;
}
ndr_err = ndr_push_nbt_string(ndr, ndr_flags, (const char *)fullname);
return ndr_err;
}
/**
copy a nbt name structure
*/
_PUBLIC_ NTSTATUS nbt_name_dup(TALLOC_CTX *mem_ctx, struct nbt_name *name, struct nbt_name *newname)
{
*newname = *name;
newname->name = talloc_strdup(mem_ctx, newname->name);
NT_STATUS_HAVE_NO_MEMORY(newname->name);
newname->scope = talloc_strdup(mem_ctx, newname->scope);
if (name->scope) {
NT_STATUS_HAVE_NO_MEMORY(newname->scope);
}
return NT_STATUS_OK;
}
/**
push a nbt name into a blob
*/
_PUBLIC_ NTSTATUS nbt_name_to_blob(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, DATA_BLOB *blob, struct nbt_name *name)
{
enum ndr_err_code ndr_err;
ndr_err = ndr_push_struct_blob(blob, mem_ctx, iconv_convenience, name, (ndr_push_flags_fn_t)ndr_push_nbt_name);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
return NT_STATUS_OK;
}
/**
pull a nbt name from a blob
*/
_PUBLIC_ NTSTATUS nbt_name_from_blob(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, struct nbt_name *name)
{
enum ndr_err_code ndr_err;
ndr_err = ndr_pull_struct_blob(blob, mem_ctx, NULL, name,
(ndr_pull_flags_fn_t)ndr_pull_nbt_name);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
return NT_STATUS_OK;
}
/**
choose a name to use when calling a server in a NBT session request.
we use heuristics to see if the name we have been given is a IP
address, or a too-long name. If it is then use *SMBSERVER, or a
truncated name
*/
_PUBLIC_ void nbt_choose_called_name(TALLOC_CTX *mem_ctx,
struct nbt_name *n, const char *name, int type)
{
n->scope = NULL;
n->type = type;
if ((name == NULL) || is_ipaddress(name)) {
n->name = "*SMBSERVER";
return;
}
if (strlen(name) > 15) {
const char *p = strchr(name, '.');
char *s;
if (p - name > 15) {
n->name = "*SMBSERVER";
return;
}
s = talloc_strndup(mem_ctx, name, PTR_DIFF(p, name));
n->name = talloc_strdup_upper(mem_ctx, s);
return;
}
n->name = talloc_strdup_upper(mem_ctx, name);
}
/*
escape a string into a form containing only a small set of characters,
the rest is hex encoded. This is similar to URL encoding
*/
static const char *nbt_hex_encode(TALLOC_CTX *mem_ctx, const char *s)
{
int i, len;
char *ret;
const char *valid_chars = "_-.$@ ";
#define NBT_CHAR_ALLOW(c) (isalnum((unsigned char)c) || strchr(valid_chars, c))
for (len=i=0;s[i];i++,len++) {
if (!NBT_CHAR_ALLOW(s[i])) {
len += 2;
}
}
ret = talloc_array(mem_ctx, char, len+1);
if (ret == NULL) return NULL;
for (len=i=0;s[i];i++) {
if (NBT_CHAR_ALLOW(s[i])) {
ret[len++] = s[i];
} else {
snprintf(&ret[len], 4, "%%%02x", (unsigned char)s[i]);
len += 3;
}
}
ret[len] = 0;
return ret;
}
/**
form a string for a NBT name
*/
_PUBLIC_ char *nbt_name_string(TALLOC_CTX *mem_ctx, const struct nbt_name *name)
{
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
char *ret;
if (name->scope) {
ret = talloc_asprintf(mem_ctx, "%s<%02x>-%s",
nbt_hex_encode(tmp_ctx, name->name),
name->type,
nbt_hex_encode(tmp_ctx, name->scope));
} else {
ret = talloc_asprintf(mem_ctx, "%s<%02x>",
nbt_hex_encode(tmp_ctx, name->name),
name->type);
}
talloc_free(tmp_ctx);
return ret;
}
/**
pull a nbt name, WINS Replication uses another on wire format for nbt name
*/
_PUBLIC_ enum ndr_err_code ndr_pull_wrepl_nbt_name(struct ndr_pull *ndr, int ndr_flags, const struct nbt_name **_r)
{
struct nbt_name *r;
uint8_t *namebuf;
uint32_t namebuf_len;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_pull_align(ndr, 4));
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &namebuf_len));
if (namebuf_len < 1 || namebuf_len > 255) {
return ndr_pull_error(ndr, NDR_ERR_ALLOC, "value out of range");
}
NDR_PULL_ALLOC_N(ndr, namebuf, namebuf_len);
NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, namebuf, namebuf_len));
if ((namebuf_len % 4) == 0) {
/*
* [MS-WINSRA] — v20091104 was wrong
* regarding section "2.2.10.1 Name Record"
*
* If the name buffer is already 4 byte aligned
* Windows (at least 2003 SP1 and 2008) add 4 extra
* bytes. This can happen when the name has a scope.
*/
uint32_t pad;
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &pad));
}
NDR_PULL_ALLOC(ndr, r);
/* oh wow, what a nasty bug in windows ... */
if (namebuf[0] == 0x1b && namebuf_len >= 16) {
namebuf[0] = namebuf[15];
namebuf[15] = 0x1b;
}
if (namebuf_len < 17) {
r->type = 0x00;
r->name = talloc_strndup(r, (char *)namebuf, namebuf_len);
if (!r->name) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
r->scope= NULL;
talloc_free(namebuf);
*_r = r;
return NDR_ERR_SUCCESS;
}
r->type = namebuf[15];
namebuf[15] = '\0';
trim_string((char *)namebuf, NULL, " ");
r->name = talloc_strdup(r, (char *)namebuf);
if (!r->name) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
if (namebuf_len > 17) {
r->scope = talloc_strndup(r, (char *)(namebuf+16), namebuf_len-17);
if (!r->scope) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
} else {
r->scope = NULL;
}
talloc_free(namebuf);
*_r = r;
return NDR_ERR_SUCCESS;
}
/**
push a nbt name, WINS Replication uses another on wire format for nbt name
*/
_PUBLIC_ enum ndr_err_code ndr_push_wrepl_nbt_name(struct ndr_push *ndr, int ndr_flags, const struct nbt_name *r)
{
uint8_t *namebuf;
uint32_t namebuf_len;
uint32_t _name_len;
uint32_t scope_len = 0;
if (r == NULL) {
return ndr_push_error(ndr, NDR_ERR_INVALID_POINTER,
"wrepl_nbt_name NULL pointer");
}
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
_name_len = strlen(r->name);
if (_name_len > 15) {
return ndr_push_error(ndr, NDR_ERR_STRING,
"wrepl_nbt_name longer as 15 chars: %s",
r->name);
}
if (r->scope) {
scope_len = strlen(r->scope);
}
if (scope_len > 238) {
return ndr_push_error(ndr, NDR_ERR_STRING,
"wrepl_nbt_name scope longer as 238 chars: %s",
r->scope);
}
namebuf = (uint8_t *)talloc_asprintf(ndr, "%-15s%c%s",
r->name, 'X',
(r->scope?r->scope:""));
if (!namebuf) return ndr_push_error(ndr, NDR_ERR_ALLOC, "out of memory");
namebuf_len = strlen((char *)namebuf) + 1;
/*
* we need to set the type here, and use a place-holder in the talloc_asprintf()
* as the type can be 0x00, and then the namebuf_len = strlen(namebuf); would give wrong results
*/
namebuf[15] = r->type;
/* oh wow, what a nasty bug in windows ... */
if (r->type == 0x1b) {
namebuf[15] = namebuf[0];
namebuf[0] = 0x1b;
}
NDR_CHECK(ndr_push_align(ndr, 4));
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, namebuf_len));
NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, namebuf, namebuf_len));
if ((namebuf_len % 4) == 0) {
/*
* [MS-WINSRA] — v20091104 was wrong
* regarding section "2.2.10.1 Name Record"
*
* If the name buffer is already 4 byte aligned
* Windows (at least 2003 SP1 and 2008) add 4 extra
* bytes. This can happen when the name has a scope.
*/
NDR_CHECK(ndr_push_zero(ndr, 4));
}
talloc_free(namebuf);
return NDR_ERR_SUCCESS;
}
_PUBLIC_ void ndr_print_wrepl_nbt_name(struct ndr_print *ndr, const char *name, const struct nbt_name *r)
{
char *s = nbt_name_string(ndr, r);
ndr_print_string(ndr, name, s);
talloc_free(s);
}
_PUBLIC_ enum ndr_err_code ndr_push_nbt_res_rec(struct ndr_push *ndr, int ndr_flags, const struct nbt_res_rec *r)
{
{
uint32_t _flags_save_STRUCT = ndr->flags;
ndr_set_flags(&ndr->flags, LIBNDR_PRINT_ARRAY_HEX);
if (ndr_flags & NDR_SCALARS) {
NDR_CHECK(ndr_push_align(ndr, 4));
NDR_CHECK(ndr_push_nbt_name(ndr, NDR_SCALARS, &r->name));
NDR_CHECK(ndr_push_nbt_qtype(ndr, NDR_SCALARS, r->rr_type));
NDR_CHECK(ndr_push_nbt_qclass(ndr, NDR_SCALARS, r->rr_class));
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->ttl));
NDR_CHECK(ndr_push_set_switch_value(ndr, &r->rdata, ((((r->rr_type) == NBT_QTYPE_NETBIOS) && ((r->rdata).data.length == 2))?0:r->rr_type)));
NDR_CHECK(ndr_push_nbt_rdata(ndr, NDR_SCALARS, &r->rdata));
}
if (ndr_flags & NDR_BUFFERS) {
}
ndr->flags = _flags_save_STRUCT;
}
return NDR_ERR_SUCCESS;
}