mirror of
https://github.com/samba-team/samba.git
synced 2024-12-27 03:21:53 +03:00
95705e904f
Andrew Bartlett
(This used to be commit c6d416541b
)
772 lines
19 KiB
C
772 lines
19 KiB
C
/*
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Unix SMB/CIFS implementation.
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string substitution functions
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Copyright (C) Andrew Tridgell 1992-2000
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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fstring local_machine="";
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fstring remote_arch="UNKNOWN";
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userdom_struct current_user_info;
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fstring remote_proto="UNKNOWN";
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static fstring remote_machine;
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static fstring smb_user_name;
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/**
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* Set the 'local' machine name
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* @param local_name the name we are being called
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* @param if this is the 'final' name for us, not be be changed again
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*/
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void set_local_machine_name(const char* local_name, BOOL perm)
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{
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static BOOL already_perm = False;
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fstring tmp_local_machine;
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/*
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* Windows NT/2k uses "*SMBSERVER" and XP uses "*SMBSERV"
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* arrggg!!!
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*/
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if (strcasecmp(local_name, "*SMBSERVER")==0)
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return;
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if (strcasecmp(local_name, "*SMBSERV")==0)
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return;
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if (already_perm)
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return;
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already_perm = perm;
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fstrcpy(tmp_local_machine,local_name);
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trim_string(tmp_local_machine," "," ");
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strlower(tmp_local_machine);
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alpha_strcpy(local_machine,tmp_local_machine,SAFE_NETBIOS_CHARS,sizeof(local_machine)-1);
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}
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/**
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* Set the 'remote' machine name
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* @param remote_name the name our client wants to be called by
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* @param if this is the 'final' name for them, not be be changed again
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*/
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void set_remote_machine_name(const char* remote_name, BOOL perm)
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{
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static BOOL already_perm = False;
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fstring tmp_remote_machine;
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if (already_perm)
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return;
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already_perm = perm;
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fstrcpy(tmp_remote_machine,remote_name);
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trim_string(tmp_remote_machine," "," ");
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strlower(tmp_remote_machine);
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alpha_strcpy(remote_machine,tmp_remote_machine,SAFE_NETBIOS_CHARS,sizeof(remote_machine)-1);
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}
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const char* get_remote_machine_name(void)
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{
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return remote_machine;
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}
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const char* get_local_machine_name(void)
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{
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if (!*local_machine) {
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return global_myname();
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}
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return local_machine;
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}
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/*
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setup the string used by %U substitution
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*/
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void sub_set_smb_name(const char *name)
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{
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fstring tmp;
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/* don't let anonymous logins override the name */
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if (! *name) return;
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fstrcpy(tmp,name);
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trim_string(tmp," "," ");
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strlower(tmp);
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alpha_strcpy(smb_user_name,tmp,SAFE_NETBIOS_CHARS,sizeof(smb_user_name)-1);
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}
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/*******************************************************************
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Given a pointer to a %$(NAME) expand it as an environment variable.
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Return the number of characters by which the pointer should be advanced.
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Based on code by Branko Cibej <branko.cibej@hermes.si>
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When this is called p points at the '%' character.
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********************************************************************/
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static size_t expand_env_var(char *p, int len)
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{
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fstring envname;
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char *envval;
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char *q, *r;
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int copylen;
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if (p[1] != '$')
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return 1;
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if (p[2] != '(')
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return 2;
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/*
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* Look for the terminating ')'.
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*/
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if ((q = strchr_m(p,')')) == NULL) {
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DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
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return 2;
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}
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/*
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* Extract the name from within the %$(NAME) string.
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*/
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r = p+3;
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copylen = MIN((q-r),(sizeof(envname)-1));
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strncpy(envname,r,copylen);
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envname[copylen] = '\0';
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if ((envval = getenv(envname)) == NULL) {
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DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
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return 2;
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}
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/*
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* Copy the full %$(NAME) into envname so it
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* can be replaced.
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*/
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copylen = MIN((q+1-p),(sizeof(envname)-1));
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strncpy(envname,p,copylen);
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envname[copylen] = '\0';
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string_sub(p,envname,envval,len);
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return 0; /* Allow the environment contents to be parsed. */
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}
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/*******************************************************************
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Given a pointer to a %$(NAME) in p and the whole string in str
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expand it as an environment variable.
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Return a new allocated and expanded string.
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Based on code by Branko Cibej <branko.cibej@hermes.si>
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When this is called p points at the '%' character.
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May substitute multiple occurrencies of the same env var.
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********************************************************************/
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static char * realloc_expand_env_var(char *str, char *p)
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{
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char *envname;
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char *envval;
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char *q, *r;
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int copylen;
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if (p[0] != '%' || p[1] != '$' || p[2] != '(')
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return str;
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/*
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* Look for the terminating ')'.
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*/
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if ((q = strchr_m(p,')')) == NULL) {
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DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
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return str;
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}
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/*
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* Extract the name from within the %$(NAME) string.
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*/
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r = p + 3;
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copylen = q - r;
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envname = (char *)malloc(copylen + 1 + 4); /* reserve space for use later add %$() chars */
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if (envname == NULL) return NULL;
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strncpy(envname,r,copylen);
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envname[copylen] = '\0';
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if ((envval = getenv(envname)) == NULL) {
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DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
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SAFE_FREE(envname);
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return str;
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}
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/*
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* Copy the full %$(NAME) into envname so it
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* can be replaced.
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*/
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copylen = q + 1 - p;
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strncpy(envname,p,copylen);
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envname[copylen] = '\0';
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r = realloc_string_sub(str, envname, envval);
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SAFE_FREE(envname);
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if (r == NULL) return NULL;
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return r;
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}
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/*******************************************************************
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Patch from jkf@soton.ac.uk
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Added this to implement %p (NIS auto-map version of %H)
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*******************************************************************/
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static char *automount_path(const char *user_name)
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{
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static pstring server_path;
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/* use the passwd entry as the default */
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/* this will be the default if WITH_AUTOMOUNT is not used or fails */
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pstrcpy(server_path, get_user_home_dir(user_name));
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#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
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if (lp_nis_home_map()) {
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char *home_path_start;
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char *automount_value = automount_lookup(user_name);
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if(strlen(automount_value) > 0) {
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home_path_start = strchr_m(automount_value,':');
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if (home_path_start != NULL) {
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DEBUG(5, ("NIS lookup succeeded. Home path is: %s\n",
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home_path_start?(home_path_start+1):""));
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pstrcpy(server_path, home_path_start+1);
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}
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} else {
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/* NIS key lookup failed: default to user home directory from password file */
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DEBUG(5, ("NIS lookup failed. Using Home path from passwd file. Home path is: %s\n", server_path ));
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}
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}
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#endif
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DEBUG(4,("Home server path: %s\n", server_path));
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return server_path;
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}
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/*******************************************************************
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Patch from jkf@soton.ac.uk
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This is Luke's original function with the NIS lookup code
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moved out to a separate function.
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*******************************************************************/
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static const char *automount_server(const char *user_name)
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{
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static pstring server_name;
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const char *local_machine_name = get_local_machine_name();
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/* use the local machine name as the default */
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/* this will be the default if WITH_AUTOMOUNT is not used or fails */
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if (local_machine_name && *local_machine_name)
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pstrcpy(server_name, local_machine_name);
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else
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pstrcpy(server_name, global_myname());
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#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
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if (lp_nis_home_map()) {
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int home_server_len;
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char *automount_value = automount_lookup(user_name);
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home_server_len = strcspn(automount_value,":");
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DEBUG(5, ("NIS lookup succeeded. Home server length: %d\n",home_server_len));
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if (home_server_len > sizeof(pstring))
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home_server_len = sizeof(pstring);
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strncpy(server_name, automount_value, home_server_len);
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server_name[home_server_len] = '\0';
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}
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#endif
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DEBUG(4,("Home server: %s\n", server_name));
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return server_name;
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}
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/****************************************************************************
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Do some standard substitutions in a string.
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len is the length in bytes of the space allowed in string str. If zero means
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don't allow expansions.
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****************************************************************************/
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void standard_sub_basic(const char *smb_name, char *str,size_t len)
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{
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char *p, *s;
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fstring pidstr;
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struct passwd *pass;
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const char *local_machine_name = get_local_machine_name();
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for (s=str; (p=strchr_m(s, '%'));s=p) {
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fstring tmp_str;
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int l = (int)len - (int)(p-str);
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if (l < 0)
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l = 0;
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switch (*(p+1)) {
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case 'U' :
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fstrcpy(tmp_str, smb_name);
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strlower(tmp_str);
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string_sub(p,"%U",tmp_str,l);
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break;
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case 'G' :
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fstrcpy(tmp_str, smb_name);
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if ((pass = Get_Pwnam(tmp_str))!=NULL) {
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string_sub(p,"%G",gidtoname(pass->pw_gid),l);
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} else {
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p += 2;
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}
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break;
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case 'D' :
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fstrcpy(tmp_str, current_user_info.domain);
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strupper(tmp_str);
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string_sub(p,"%D", tmp_str,l);
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break;
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case 'I' :
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string_sub(p,"%I", client_addr(),l);
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break;
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case 'L' :
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if (local_machine_name && *local_machine_name)
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string_sub(p,"%L", local_machine_name,l);
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else {
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pstring temp_name;
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pstrcpy(temp_name, global_myname());
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strlower(temp_name);
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string_sub(p,"%L", temp_name,l);
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}
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break;
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case 'M' :
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string_sub(p,"%M", client_name(),l);
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break;
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case 'R' :
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string_sub(p,"%R", remote_proto,l);
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break;
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case 'T' :
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string_sub(p,"%T", timestring(False),l);
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break;
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case 'a' :
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string_sub(p,"%a", remote_arch,l);
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break;
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case 'd' :
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slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
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string_sub(p,"%d", pidstr,l);
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break;
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case 'h' :
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string_sub(p,"%h", myhostname(),l);
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break;
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case 'm' :
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string_sub(p,"%m", get_remote_machine_name(),l);
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break;
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case 'v' :
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string_sub(p,"%v", VERSION,l);
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break;
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case '$' :
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p += expand_env_var(p,l);
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break; /* Expand environment variables */
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case '\0':
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p++;
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break; /* don't run off the end of the string */
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default: p+=2;
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break;
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}
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}
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}
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static void standard_sub_advanced(int snum, const char *user,
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const char *connectpath, gid_t gid,
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const char *smb_name, char *str, size_t len)
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{
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char *p, *s, *home;
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for (s=str; (p=strchr_m(s, '%'));s=p) {
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int l = (int)len - (int)(p-str);
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if (l < 0)
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l = 0;
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switch (*(p+1)) {
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case 'N' :
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string_sub(p,"%N", automount_server(user),l);
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break;
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case 'H':
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if ((home = get_user_home_dir(user)))
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string_sub(p,"%H",home, l);
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else
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p += 2;
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break;
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case 'P':
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string_sub(p,"%P", connectpath, l);
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break;
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case 'S':
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string_sub(p,"%S", lp_servicename(snum), l);
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break;
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case 'g':
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string_sub(p,"%g", gidtoname(gid), l);
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break;
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case 'u':
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string_sub(p,"%u", user, l);
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break;
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/* Patch from jkf@soton.ac.uk Left the %N (NIS
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* server name) in standard_sub_basic as it is
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* a feature for logon servers, hence uses the
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* username. The %p (NIS server path) code is
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* here as it is used instead of the default
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* "path =" string in [homes] and so needs the
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* service name, not the username. */
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case 'p':
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string_sub(p,"%p", automount_path(lp_servicename(snum)), l);
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break;
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case '\0':
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p++;
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break; /* don't run off the end of the string */
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default: p+=2;
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break;
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}
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}
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standard_sub_basic(smb_name, str, len);
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}
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/****************************************************************************
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Do some standard substitutions in a string.
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This function will return an allocated string that have to be freed.
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****************************************************************************/
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char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name, const char *str)
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{
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char *a, *t;
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a = alloc_sub_basic(smb_name, str);
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if (!a) return NULL;
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t = talloc_strdup(mem_ctx, a);
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SAFE_FREE(a);
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return t;
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}
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char *alloc_sub_basic(const char *smb_name, const char *str)
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{
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char *b, *p, *s, *t, *r, *a_string;
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fstring pidstr;
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struct passwd *pass;
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const char *local_machine_name = get_local_machine_name();
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a_string = strdup(str);
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if (a_string == NULL) {
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DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
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return NULL;
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}
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for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
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r = NULL;
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b = t = a_string;
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switch (*(p+1)) {
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case 'U' :
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r = strdup_lower(smb_name);
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if (r == NULL) goto error;
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t = realloc_string_sub(t, "%U", r);
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break;
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case 'G' :
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r = strdup(smb_name);
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if (r == NULL) goto error;
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if ((pass = Get_Pwnam(r))!=NULL) {
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t = realloc_string_sub(t, "%G", gidtoname(pass->pw_gid));
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}
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break;
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case 'D' :
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r = strdup_upper(current_user_info.domain);
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if (r == NULL) goto error;
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t = realloc_string_sub(t, "%D", r);
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break;
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case 'I' :
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t = realloc_string_sub(t, "%I", client_addr());
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break;
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case 'L' :
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if (local_machine_name && *local_machine_name)
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t = realloc_string_sub(t, "%L", local_machine_name);
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else
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t = realloc_string_sub(t, "%L", global_myname());
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break;
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case 'M' :
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t = realloc_string_sub(t, "%M", client_name());
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break;
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case 'R' :
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t = realloc_string_sub(t, "%R", remote_proto);
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break;
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case 'T' :
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t = realloc_string_sub(t, "%T", timestring(False));
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break;
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case 'a' :
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t = realloc_string_sub(t, "%a", remote_arch);
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break;
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case 'd' :
|
|
slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
|
|
t = realloc_string_sub(t, "%d", pidstr);
|
|
break;
|
|
case 'h' :
|
|
t = realloc_string_sub(t, "%h", myhostname());
|
|
break;
|
|
case 'm' :
|
|
t = realloc_string_sub(t, "%m", remote_machine);
|
|
break;
|
|
case 'v' :
|
|
t = realloc_string_sub(t, "%v", VERSION);
|
|
break;
|
|
case '$' :
|
|
t = realloc_expand_env_var(t, p); /* Expand environment variables */
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
p++;
|
|
SAFE_FREE(r);
|
|
if (t == NULL) goto error;
|
|
a_string = t;
|
|
}
|
|
|
|
return a_string;
|
|
error:
|
|
SAFE_FREE(a_string);
|
|
return NULL;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Do some specific substitutions in a string.
|
|
This function will return an allocated string that have to be freed.
|
|
****************************************************************************/
|
|
|
|
char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
|
|
const char *input_string,
|
|
const char *username,
|
|
const char *domain,
|
|
uid_t uid,
|
|
gid_t gid)
|
|
{
|
|
char *a, *t;
|
|
a = alloc_sub_specified(input_string, username, domain, uid, gid);
|
|
if (!a) return NULL;
|
|
t = talloc_strdup(mem_ctx, a);
|
|
SAFE_FREE(a);
|
|
return t;
|
|
}
|
|
|
|
char *alloc_sub_specified(const char *input_string,
|
|
const char *username,
|
|
const char *domain,
|
|
uid_t uid,
|
|
gid_t gid)
|
|
{
|
|
char *a_string, *ret_string;
|
|
char *b, *p, *s, *t;
|
|
|
|
a_string = strdup(input_string);
|
|
if (a_string == NULL) {
|
|
DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
|
|
return NULL;
|
|
}
|
|
|
|
for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
|
|
|
|
b = t = a_string;
|
|
|
|
switch (*(p+1)) {
|
|
case 'U' :
|
|
t = realloc_string_sub(t, "%U", username);
|
|
break;
|
|
case 'u' :
|
|
t = realloc_string_sub(t, "%u", username);
|
|
break;
|
|
case 'G' :
|
|
if (gid != -1) {
|
|
t = realloc_string_sub(t, "%G", gidtoname(gid));
|
|
} else {
|
|
t = realloc_string_sub(t, "%G", "NO_GROUP");
|
|
}
|
|
break;
|
|
case 'g' :
|
|
if (gid != -1) {
|
|
t = realloc_string_sub(t, "%g", gidtoname(gid));
|
|
} else {
|
|
t = realloc_string_sub(t, "%g", "NO_GROUP");
|
|
}
|
|
break;
|
|
case 'D' :
|
|
t = realloc_string_sub(t, "%D", domain);
|
|
break;
|
|
case 'N' :
|
|
t = realloc_string_sub(t, "%N", automount_server(username));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
p++;
|
|
if (t == NULL) {
|
|
SAFE_FREE(a_string);
|
|
return NULL;
|
|
}
|
|
a_string = t;
|
|
}
|
|
|
|
ret_string = alloc_sub_basic(username, a_string);
|
|
SAFE_FREE(a_string);
|
|
return ret_string;
|
|
}
|
|
|
|
char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
|
|
int snum,
|
|
const char *user,
|
|
const char *connectpath,
|
|
gid_t gid,
|
|
const char *smb_name,
|
|
char *str)
|
|
{
|
|
char *a, *t;
|
|
a = alloc_sub_advanced(snum, user, connectpath, gid, smb_name, str);
|
|
if (!a) return NULL;
|
|
t = talloc_strdup(mem_ctx, a);
|
|
SAFE_FREE(a);
|
|
return t;
|
|
}
|
|
|
|
char *alloc_sub_advanced(int snum, const char *user,
|
|
const char *connectpath, gid_t gid,
|
|
const char *smb_name, char *str)
|
|
{
|
|
char *a_string, *ret_string;
|
|
char *b, *p, *s, *t, *h;
|
|
|
|
a_string = strdup(str);
|
|
if (a_string == NULL) {
|
|
DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
|
|
return NULL;
|
|
}
|
|
|
|
for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
|
|
|
|
b = t = a_string;
|
|
|
|
switch (*(p+1)) {
|
|
case 'N' :
|
|
t = realloc_string_sub(t, "%N", automount_server(user));
|
|
break;
|
|
case 'H':
|
|
if ((h = get_user_home_dir(user)))
|
|
t = realloc_string_sub(t, "%H", h);
|
|
break;
|
|
case 'P':
|
|
t = realloc_string_sub(t, "%P", connectpath);
|
|
break;
|
|
case 'S':
|
|
t = realloc_string_sub(t, "%S", lp_servicename(snum));
|
|
break;
|
|
case 'g':
|
|
t = realloc_string_sub(t, "%g", gidtoname(gid));
|
|
break;
|
|
case 'u':
|
|
t = realloc_string_sub(t, "%u", user);
|
|
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':
|
|
t = realloc_string_sub(t, "%p", automount_path(lp_servicename(snum)));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
p++;
|
|
if (t == NULL) {
|
|
SAFE_FREE(a_string);
|
|
return NULL;
|
|
}
|
|
a_string = t;
|
|
}
|
|
|
|
ret_string = alloc_sub_basic(smb_name, a_string);
|
|
SAFE_FREE(a_string);
|
|
return ret_string;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Do some standard substitutions in a string.
|
|
****************************************************************************/
|
|
|
|
void standard_sub_conn(connection_struct *conn, char *str, size_t len)
|
|
{
|
|
standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath,
|
|
conn->gid, smb_user_name, str, len);
|
|
}
|
|
|
|
char *talloc_sub_conn(TALLOC_CTX *mem_ctx, connection_struct *conn, char *str)
|
|
{
|
|
return talloc_sub_advanced(mem_ctx, SNUM(conn), conn->user,
|
|
conn->connectpath, conn->gid,
|
|
smb_user_name, str);
|
|
}
|
|
|
|
char *alloc_sub_conn(connection_struct *conn, char *str)
|
|
{
|
|
return alloc_sub_advanced(SNUM(conn), conn->user, conn->connectpath,
|
|
conn->gid, smb_user_name, str);
|
|
}
|
|
|
|
/****************************************************************************
|
|
Like standard_sub but by snum.
|
|
****************************************************************************/
|
|
|
|
void standard_sub_snum(int snum, char *str, size_t 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,
|
|
smb_user_name, str, len);
|
|
}
|