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Sourcecode: samba-doc-ja version File versions

substitute.c

/* 
   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"

fstring local_machine="";
fstring remote_arch="UNKNOWN";
userdom_struct current_user_info;
pstring samlogon_user="";
BOOL sam_logon_in_ssb = False;
fstring remote_proto="UNKNOWN";
fstring remote_machine="";
static fstring smb_user_name;


/*
  setup the string used by %U substitution 
*/
void sub_set_smb_name(const char *name)
{
      fstring tmp;

      /* ignore anonymous settings */
      if (! *name) return;

      fstrcpy(tmp,name);
      trim_string(tmp,strlen(tmp)+1," ",sizeof(" ")," ",sizeof(" "));
      strlower(tmp);
      alpha_strcpy(smb_user_name,tmp,SAFE_NETBIOS_CHARS,sizeof(smb_user_name)-1);
}

const char* get_remote_machine_name(void)
{
              return 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, False);
      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(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);

            if(strlen(automount_value) > 0) {
                  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);
                  }
            } else {
                  /* NIS key lookup failed: default to user home directory from password file */
                  DEBUG(5, ("NIS lookup failed. Using Home path from passwd file. Home path is: %s\n", server_path ));
            }
      }
#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)
{
      extern pstring global_myname;
      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 */
      if (*local_machine)
            pstrcpy(server_name, local_machine);
      else
            pstrcpy(server_name, global_myname);

#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;
}

/****************************************************************************
 Do some standard substitutions in a string.
****************************************************************************/

void standard_sub_basic(char *str, int len)
{
      extern pstring global_myname;
      char *p, *s;
      fstring pidstr;
      struct passwd *pass;

      for (s=str; (p=strchr(s, '%'));s=p) {
            fstring tmp_str;

            int l = len - (int)(p-str);
            
            switch (*(p+1)) {
            case 'U' : 
                  fstrcpy(tmp_str, sam_logon_in_ssb?samlogon_user:smb_user_name);
                  strlower(tmp_str);
                  string_sub(p,"%U",tmp_str,l, False);
                  break;
            case 'G' :
                  fstrcpy(tmp_str, sam_logon_in_ssb?samlogon_user:smb_user_name);
                  if ((pass = Get_Pwnam(tmp_str, False))!=NULL) {
                        string_sub(p,"%G",gidtoname(pass->pw_gid),l, False);
                  } else {
                        p += 2;
                  }
                  break;
            case 'D' :
                  fstrcpy(tmp_str, current_user_info.domain);
                  strupper(tmp_str);
                  string_sub(p,"%D", tmp_str,l, False);
                  break;
            case 'I' : string_sub(p,"%I", client_addr(),l, False); break;
            case 'L' : 
                  if (*local_machine)
                        string_sub(p,"%L", local_machine,l, True); 
                  else {
                        pstring temp_name;

                        pstrcpy(temp_name, global_myname);
                        strlower(temp_name);
                        string_sub(p,"%L", temp_name,l, True);
                  }
                  break;
            case 'M' : string_sub(p,"%M", client_name(),l, False); break;
            case 'R' : string_sub(p,"%R", remote_proto,l, False); break;
            case 'T' : string_sub(p,"%T", timestring(False),l, False); break;
            case 'a' : string_sub(p,"%a", remote_arch,l, False); break;
            case 'd' :
                  slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
                  string_sub(p,"%d", pidstr,l, False);
                  break;
            case 'h' : string_sub(p,"%h", myhostname(),l, True); break;
            case 'm' : string_sub(p,"%m", remote_machine,l, True); break;
            case 'v' : string_sub(p,"%v", VERSION,l, False); break;
            case '$' : p += expand_env_var(p,l); break; /* Expand environment variables */
            case '\0': 
                  p++; 
                  break; /* don't run off the end of the string */
                  
            default: p+=2; 
                  break;
            }
      }
}

/****************************************************************************
 Do some standard substitutions in a string.
****************************************************************************/

void standard_sub_advanced(int snum, char *user, const char *connectpath, gid_t gid, char *str, int len)
{
      char *p, *s, *home;

      for (s=str; (p=strchr(s, '%'));s=p) {
            int l = len - (int)(p-str);
            
            switch (*(p+1)) {
            case 'N' : string_sub(p,"%N", automount_server(user),l, False); break;
            case 'H':
                  if ((home = get_user_home_dir(user))) {
                        string_sub(p,"%H",home, l, False);
                  } else {
                        p += 2;
                  }
                  break;
            case 'P': 
                  string_sub(p,"%P", connectpath, l, False); 
                  break;
                  
            case 'S': 
                  string_sub(p,"%S", lp_servicename(snum), l, True); 
                  break;
                  
            case 'g': 
                  string_sub(p,"%g", gidtoname(gid), l, False); 
                  break;
            case 'u': 
                  string_sub(p,"%u", user, l, False); 
                  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, False); 
                  break;
            case '\0': 
                  p++; 
                  break; /* don't run off the end of the string */
                  
            default: p+=2; 
                  break;
            }
      }

      standard_sub_basic(str,len);
}

/****************************************************************************
 Do some standard substitutions in a string.
****************************************************************************/

void standard_sub_conn(connection_struct *conn, char *str, int len)
{
      standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath, conn->gid, str, len);
}

/****************************************************************************
 Like standard_sub but for a homes share where snum still points to the [homes]
 share. No user specific snum created yet so servicename should be the username.
****************************************************************************/

void standard_sub_home(int snum, char *user, char *str, int len)
{
      char *p, *s;

      for (s=str; (p=strchr(s, '%'));s=p) {
            int l = len - (int)(p-str);
            
            switch (*(p+1)) {
            case 'S': 
                  string_sub(p,"%S", user, l, True); 
                  break;
            case 'p': 
                  string_sub(p,"%p", automount_path(user), l, False); 
                  break;
            case '\0': 
                  p++; 
                  break; /* don't run off the end of the string */
                  
            default: p+=2; 
                  break;
            }
      }

      standard_sub_advanced(snum, user, "", -1, str, len);
}

/****************************************************************************
 Like standard_sub but by snum.
****************************************************************************/

void standard_sub_snum(int snum, char *str, int len)
{
      extern struct current_user current_user;
      static uid_t cached_uid = -1;
      static fstring cached_user;
      /* calling uidtoname() on every substitute would be too expensive, so
         we cache the result here as nearly every call is for the same uid */

      if (cached_uid != current_user.uid) {
            fstrcpy(cached_user, uidtoname(current_user.uid));
            cached_uid = current_user.uid;
      }

      standard_sub_advanced(snum, cached_user, "", -1, str, len);
}

/*******************************************************************
 Substitute strings with useful parameters.
********************************************************************/

void standard_sub_vuser(char *str, int len, user_struct *vuser)
{
      standard_sub_advanced(-1, vuser->user.unix_name, "", -1, str, len);
}

/*******************************************************************
 Substitute strings with useful parameters.
********************************************************************/

void standard_sub_vsnum(char *str, int len, user_struct *vuser, int snum)
{
      standard_sub_advanced(snum, vuser->user.unix_name, "", -1, str, len);
}

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