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-rw-r--r--source3/lib/substitute.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/source3/lib/substitute.c b/source3/lib/substitute.c
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+++ b/source3/lib/substitute.c
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+/*
+ Unix SMB/CIFS implementation.
+ 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;
+fstring remote_proto="UNKNOWN";
+fstring remote_machine="";
+extern pstring global_myname;
+
+/*******************************************************************
+ 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_m(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(const 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_m(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(const 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 */
+ 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(const char *smb_name, char *str)
+{
+ char *p, *s;
+ fstring pidstr;
+ struct passwd *pass;
+
+ for (s=str; (p=strchr_m(s, '%'));s=p) {
+ fstring tmp_str;
+
+ int l = sizeof(pstring) - (int)(p-str);
+
+ switch (*(p+1)) {
+ case 'U' :
+ fstrcpy(tmp_str, smb_name);
+ strlower(tmp_str);
+ string_sub(p,"%U",tmp_str,l);
+ break;
+ case 'G' :
+ fstrcpy(tmp_str, smb_name);
+ if ((pass = Get_Pwnam(tmp_str))!=NULL) {
+ string_sub(p,"%G",gidtoname(pass->pw_gid),l);
+ } else {
+ p += 2;
+ }
+ break;
+ case 'D' :
+ fstrcpy(tmp_str, current_user_info.domain);
+ strupper(tmp_str);
+ string_sub(p,"%D", tmp_str,l);
+ break;
+ case 'I' : string_sub(p,"%I", client_addr(),l); break;
+ case 'L' :
+ if (*local_machine) {
+ string_sub(p,"%L", local_machine,l);
+ } else {
+ string_sub(p,"%L", global_myname,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 'a' : string_sub(p,"%a", remote_arch,l); break;
+ case 'd' :
+ slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_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 the end of the string */
+
+ default: p+=2;
+ break;
+ }
+ }
+}
+
+/****************************************************************************
+ Do some standard substitutions in a string.
+****************************************************************************/
+
+void standard_sub_advanced(int snum, const char *user, const char *connectpath, gid_t gid, const char *smb_name, char *str)
+{
+ char *p, *s, *home;
+
+ for (s=str; (p=strchr_m(s, '%'));s=p) {
+ int l = sizeof(pstring) - (int)(p-str);
+
+ switch (*(p+1)) {
+ case 'N' : string_sub(p,"%N", automount_server(user),l); break;
+ 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(smb_name, str);
+}
+
+/****************************************************************************
+ Do some standard substitutions in a string.
+****************************************************************************/
+
+void standard_sub_conn(connection_struct *conn, char *str)
+{
+ standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath, conn->gid, current_user_info.smb_name, str);
+}
+
+/****************************************************************************
+ 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, const char *user, char *str)
+{
+ char *p, *s;
+
+ for (s=str; (p=strchr_m(s, '%'));s=p) {
+ int l = sizeof(pstring) - (int)(p-str);
+
+ switch (*(p+1)) {
+ case 'S':
+ string_sub(p,"%S", user, l);
+ break;
+ case 'p':
+ string_sub(p,"%p", automount_path(user), l);
+ break;
+ case '\0':
+ p++;
+ break; /* don't run off the end of the string */
+
+ default: p+=2;
+ break;
+ }
+ }
+
+ standard_sub_advanced(snum, user, "", -1, current_user_info.smb_name, str);
+}
+
+/****************************************************************************
+ Like standard_sub but by snum.
+****************************************************************************/
+
+void standard_sub_snum(int snum, char *str)
+{
+ 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, current_user_info.smb_name, str);
+}
+
+/*******************************************************************
+ Substitute strings with useful parameters.
+********************************************************************/
+
+void standard_sub_vuser(char *str, user_struct *vuser)
+{
+ standard_sub_advanced(-1, vuser->user.unix_name, "", -1, current_user_info.smb_name, str);
+}
+
+/*******************************************************************
+ Substitute strings with useful parameters.
+********************************************************************/
+
+void standard_sub_vsnum(char *str, user_struct *vuser, int snum)
+{
+ standard_sub_advanced(snum, vuser->user.unix_name, "", -1, current_user_info.smb_name, str);
+}
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