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/*
Unix SMB/Netbios implementation.
Version 3.0
string substitution functions
Copyright (C) Andrew Tridgell 1992-2000
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
fstring local_machine="";
fstring remote_arch="UNKNOWN";
pstring sesssetup_user="";
pstring samlogon_user="";
BOOL sam_logon_in_ssb = False;
fstring remote_proto="UNKNOWN";
fstring remote_machine="";
/*******************************************************************
Given a pointer to a %$(NAME) expand it as an environment variable.
Return the number of characters by which the pointer should be advanced.
Based on code by Branko Cibej <branko.cibej@hermes.si>
When this is called p points at the '%' character.
********************************************************************/
static size_t expand_env_var(char *p, int len)
{
fstring envname;
char *envval;
char *q, *r;
int copylen;
if (p[1] != '$')
return 1;
if (p[2] != '(')
return 2;
/*
* Look for the terminating ')'.
*/
if ((q = strchr(p,')')) == NULL) {
DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
return 2;
}
/*
* Extract the name from within the %$(NAME) string.
*/
r = p+3;
copylen = MIN((q-r),(sizeof(envname)-1));
strncpy(envname,r,copylen);
envname[copylen] = '\0';
if ((envval = getenv(envname)) == NULL) {
DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
return 2;
}
/*
* Copy the full %$(NAME) into envname so it
* can be replaced.
*/
copylen = MIN((q+1-p),(sizeof(envname)-1));
strncpy(envname,p,copylen);
envname[copylen] = '\0';
string_sub(p,envname,envval,len);
return 0; /* Allow the environment contents to be parsed. */
}
/*******************************************************************
Patch from jkf@soton.ac.uk
Added this to implement %p (NIS auto-map version of %H)
*******************************************************************/
static char *automount_path(char *user_name)
{
static pstring server_path;
/* use the passwd entry as the default */
/* this will be the default if WITH_AUTOMOUNT is not used or fails */
/* pstrcpy() copes with get_user_home_dir() returning NULL */
pstrcpy(server_path, get_user_home_dir(user_name));
#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
if (lp_nis_home_map())
{
char *home_path_start;
char *automount_value = automount_lookup(user_name);
home_path_start = strchr(automount_value,':');
if (home_path_start != NULL)
{
DEBUG(5, ("NIS lookup succeeded. Home path is: %s\n",
home_path_start?(home_path_start+1):""));
pstrcpy(server_path, home_path_start+1);
}
}
#endif
DEBUG(4,("Home server path: %s\n", server_path));
return server_path;
}
/*******************************************************************
Patch from jkf@soton.ac.uk
This is Luke's original function with the NIS lookup code
moved out to a separate function.
*******************************************************************/
static char *automount_server(char *user_name)
{
static pstring server_name;
/* use the local machine name as the default */
/* this will be the default if WITH_AUTOMOUNT is not used or fails */
pstrcpy(server_name, local_machine);
#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
if (lp_nis_home_map())
{
int home_server_len;
char *automount_value = automount_lookup(user_name);
home_server_len = strcspn(automount_value,":");
DEBUG(5, ("NIS lookup succeeded. Home server length: %d\n",home_server_len));
if (home_server_len > sizeof(pstring))
{
home_server_len = sizeof(pstring);
}
strncpy(server_name, automount_value, home_server_len);
server_name[home_server_len] = '\0';
}
#endif
DEBUG(4,("Home server: %s\n", server_name));
return server_name;
}
/*******************************************************************
Substitute strings with useful parameters.
Rewritten by Stefaan A Eeckels <Stefaan.Eeckels@ecc.lu> and
Paul Rippin <pr3245@nopc.eurostat.cec.be>.
********************************************************************/
void standard_sub_basic(char *str)
{
char *s, *p;
char pidstr[10];
struct passwd *pass;
char *username = sam_logon_in_ssb ? samlogon_user : sesssetup_user;
for (s = str ; s && *s && (p = strchr(s,'%')); s = p )
{
int l = sizeof(pstring) - (int)(p-str);
if (l < 0) {
DEBUG(0,("ERROR: string overflow by %d in standard_sub_basic(%.50s)\n",
-l, str));
return;
}
switch (*(p+1))
{
case 'G' :
{
if ((pass = Get_Pwnam(username,False))!=NULL) {
string_sub(p,"%G",gidtoname(pass->pw_gid),l);
} else {
p += 2;
}
break;
}
case 'N' : string_sub(p,"%N", automount_server(username),l); break;
case 'I' : string_sub(p,"%I", client_addr(),l); break;
case 'L' : string_sub(p,"%L", local_machine,l); break;
case 'M' : string_sub(p,"%M", client_name(),l); break;
case 'R' : string_sub(p,"%R", remote_proto,l); break;
case 'T' : string_sub(p,"%T", timestring(False),l); break;
case 'U' : string_sub(p,"%U", username,l); break;
case 'a' : string_sub(p,"%a", remote_arch,l); break;
case 'd' :
{
slprintf(pidstr,sizeof(pidstr) - 1, "%d",(int)getpid());
string_sub(p,"%d", pidstr,l);
break;
}
case 'h' : string_sub(p,"%h", myhostname(),l); break;
case 'm' : string_sub(p,"%m", remote_machine,l); break;
case 'v' : string_sub(p,"%v", VERSION,l); break;
case '$' : p += expand_env_var(p,l); break; /* Expand environment variables */
case '\0': p++; break; /* don't run off end if last character is % */
default : p+=2; break;
}
}
return;
}
/****************************************************************************
Do some standard substitutions in a string.
****************************************************************************/
void standard_sub_advanced(int snum, char *user, char *connectpath, gid_t gid, char *str)
{
char *p, *s, *home;
for (s=str; (p=strchr(s, '%'));s=p) {
int l = sizeof(pstring) - (int)(p-str);
switch (*(p+1)) {
case 'H':
if ((home = get_user_home_dir(user))) {
string_sub(p,"%H",home, l);
} else {
p += 2;
}
break;
case 'P':
string_sub(p,"%P", connectpath, l);
break;
case 'S':
string_sub(p,"%S", lp_servicename(snum), l);
break;
case 'g':
string_sub(p,"%g", gidtoname(gid), l);
break;
case 'u':
string_sub(p,"%u", user, l);
break;
/* Patch from jkf@soton.ac.uk Left the %N (NIS
* server name) in standard_sub_basic as it is
* a feature for logon servers, hence uses the
* username. The %p (NIS server path) code is
* here as it is used instead of the default
* "path =" string in [homes] and so needs the
* service name, not the username. */
case 'p':
string_sub(p,"%p", automount_path(lp_servicename(snum)), l);
break;
case '\0':
p++;
break; /* don't run off the end of the string */
default: p+=2;
break;
}
}
standard_sub_basic(str);
}
/****************************************************************************
Do some standard substitutions in a string.
****************************************************************************/
void standard_sub(connection_struct *conn, char *str)
{
if (conn==NULL)
standard_sub_advanced(-1, "", "", -1, str);
else
standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath, conn->gid, str);
}
/****************************************************************************
like standard_sub but by snum
****************************************************************************/
void standard_sub_snum(int snum, char *str)
{
standard_sub_advanced(snum, "", "", -1, str);
}
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