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/*
Unix SMB/CIFS implementation.
manipulate nbt name structures
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) Jeremy Allison 2007
Copyright (C) Andrew Bartlett 2009.
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/>.
*/
#include "includes.h"
#include "lib/util/xfile.h"
#include "lib/util/util_net.h"
#include "system/filesys.h"
#include "system/network.h"
#include "../libcli/nbt/libnbt.h"
/********************************************************
Start parsing the lmhosts file.
*********************************************************/
XFILE *startlmhosts(const char *fname)
{
XFILE *fp = x_fopen(fname,O_RDONLY, 0);
if (!fp) {
DEBUG(4,("startlmhosts: Can't open lmhosts file %s. "
"Error was %s\n",
fname, strerror(errno)));
return NULL;
}
return fp;
}
/********************************************************
Parse the next line in the lmhosts file.
*********************************************************/
bool getlmhostsent(TALLOC_CTX *ctx, XFILE *fp, char **pp_name, int *name_type,
struct sockaddr_storage *pss)
{
char line[1024];
*pp_name = NULL;
while(!x_feof(fp) && !x_ferror(fp)) {
char *ip = NULL;
char *flags = NULL;
char *extra = NULL;
char *name = NULL;
const char *ptr;
char *ptr1 = NULL;
int count = 0;
*name_type = -1;
if (!fgets_slash(line,sizeof(line),fp)) {
continue;
}
if (*line == '#') {
continue;
}
ptr = line;
if (next_token_talloc(ctx, &ptr, &ip, NULL))
++count;
if (next_token_talloc(ctx, &ptr, &name, NULL))
++count;
if (next_token_talloc(ctx, &ptr, &flags, NULL))
++count;
if (next_token_talloc(ctx, &ptr, &extra, NULL))
++count;
if (count <= 0)
continue;
if (count > 0 && count < 2) {
DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",
line));
continue;
}
if (count >= 4) {
DEBUG(0,("getlmhostsent: too many columns "
"in lmhosts file (obsolete syntax)\n"));
continue;
}
if (!flags) {
flags = talloc_strdup(ctx, "");
if (!flags) {
continue;
}
}
DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n",
ip, name, flags));
if (strchr_m(flags,'G') || strchr_m(flags,'S')) {
DEBUG(0,("getlmhostsent: group flag "
"in lmhosts ignored (obsolete)\n"));
continue;
}
if (!interpret_string_addr(pss, ip, AI_NUMERICHOST)) {
DEBUG(0,("getlmhostsent: invalid address "
"%s.\n", ip));
}
/* Extra feature. If the name ends in '#XX',
* where XX is a hex number, then only add that name type. */
if((ptr1 = strchr_m(name, '#')) != NULL) {
char *endptr;
ptr1++;
*name_type = (int)strtol(ptr1, &endptr, 16);
if(!*ptr1 || (endptr == ptr1)) {
DEBUG(0,("getlmhostsent: invalid name "
"%s containing '#'.\n", name));
continue;
}
*(--ptr1) = '\0'; /* Truncate at the '#' */
}
*pp_name = talloc_strdup(ctx, name);
if (!*pp_name) {
return false;
}
return true;
}
return false;
}
/********************************************************
Finish parsing the lmhosts file.
*********************************************************/
void endlmhosts(XFILE *fp)
{
x_fclose(fp);
}
/********************************************************
Resolve via "lmhosts" method.
*********************************************************/
NTSTATUS resolve_lmhosts_file_as_sockaddr(const char *lmhosts_file,
const char *name, int name_type,
TALLOC_CTX *mem_ctx,
struct sockaddr_storage **return_iplist,
int *return_count)
{
/*
* "lmhosts" means parse the local lmhosts file.
*/
XFILE *fp;
char *lmhost_name = NULL;
int name_type2;
struct sockaddr_storage return_ss;
NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
TALLOC_CTX *ctx = NULL;
*return_iplist = NULL;
*return_count = 0;
DEBUG(3,("resolve_lmhosts: "
"Attempting lmhosts lookup for name %s<0x%x>\n",
name, name_type));
fp = startlmhosts(lmhosts_file);
if ( fp == NULL )
return NT_STATUS_NO_SUCH_FILE;
ctx = talloc_new(mem_ctx);
if (!ctx) {
endlmhosts(fp);
return NT_STATUS_NO_MEMORY;
}
while (getlmhostsent(ctx, fp, &lmhost_name, &name_type2, &return_ss)) {
if (!strequal(name, lmhost_name)) {
TALLOC_FREE(lmhost_name);
continue;
}
if ((name_type2 != -1) && (name_type != name_type2)) {
TALLOC_FREE(lmhost_name);
continue;
}
*return_iplist = talloc_realloc(ctx, (*return_iplist),
struct sockaddr_storage,
(*return_count)+1);
if ((*return_iplist) == NULL) {
TALLOC_FREE(ctx);
endlmhosts(fp);
DEBUG(3,("resolve_lmhosts: talloc_realloc fail !\n"));
return NT_STATUS_NO_MEMORY;
}
(*return_iplist)[*return_count] = return_ss;
*return_count += 1;
/* we found something */
status = NT_STATUS_OK;
/* Multiple names only for DC lookup */
if (name_type != 0x1c)
break;
}
talloc_steal(mem_ctx, *return_iplist);
TALLOC_FREE(ctx);
endlmhosts(fp);
return status;
}
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