substitute.c

samba-3.0.22.tar.gz 编译smb服务器的源码

			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", get_remote_machine_name(),l);
			break;
		case 'v' :
			string_sub(p,"%v", SAMBA_VERSION_STRING,l);
			break;
		case 'w' :
			string_sub(p,"%w", lp_winbind_separator(),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;
		}
	}
}

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

	for (s=str; (p=strchr_m(s, '%'));s=p) {
		int l = (int)len - (int)(p-str);
	
		if (l < 0)
			l = 0;
	
		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': 
			if ( snum != -1 )
				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 [e-mail] 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': 
			if ( snum != -1 )
				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, len);
}

/****************************************************************************
 Do some standard substitutions in a string.
 This function will return an allocated string that have to be freed.
****************************************************************************/

char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name, const char *str)
{
	char *a, *t;
       	a = alloc_sub_basic(smb_name, str);
	if (!a) return NULL;
	t = talloc_strdup(mem_ctx, a);
	SAFE_FREE(a);
	return t;
}

char *alloc_sub_basic(const char *smb_name, const char *str)
{
	char *b, *p, *s, *t, *r, *a_string;
	fstring pidstr;
	struct passwd *pass;
	const char *local_machine_name = get_local_machine_name();

	/* workaround to prevent a crash while lookinf at bug #687 */
	
	if ( !str ) {
		DEBUG(0,("alloc_sub_basic: NULL source string!  This should not happen\n"));
		return NULL;
	}
	
	a_string = SMB_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)) {

		r = NULL;
		b = t = a_string;
		
		switch (*(p+1)) {
		case 'U' : 
			r = strdup_lower(smb_name);
			if (r == NULL) goto error;
			t = realloc_string_sub(t, "%U", r);
			break;
		case 'G' :
			r = SMB_STRDUP(smb_name);
			if (r == NULL) goto error;
			if ((pass = Get_Pwnam(r))!=NULL) {
				t = realloc_string_sub(t, "%G", gidtoname(pass->pw_gid));
			} 
			break;
		case 'D' :
			r = strdup_upper(current_user_info.domain);
			if (r == NULL) goto error;
			t = realloc_string_sub(t, "%D", r);
			break;
		case 'I' :
			t = realloc_string_sub(t, "%I", client_addr());
			break;
		case 'L' : 
			if (local_machine_name && *local_machine_name)
				t = realloc_string_sub(t, "%L", local_machine_name); 
			else
				t = realloc_string_sub(t, "%L", global_myname()); 
			break;
		case 'N':
			t = realloc_string_sub(t, "%N", automount_server(smb_name));
			break;
		case 'M' :
			t = realloc_string_sub(t, "%M", client_name());
			break;
		case 'R' :
			t = realloc_string_sub(t, "%R", remote_proto);
			break;
		case 'T' :
			t = realloc_string_sub(t, "%T", timestring(False));
			break;
		case 'a' :
			t = realloc_string_sub(t, "%a", remote_arch);
			break;
		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", SAMBA_VERSION_STRING);
			break;
		case 'w' :
			t = realloc_string_sub(t, "%w", lp_winbind_separator());
			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 = SMB_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,
			const 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, const char *str)
{
	char *a_string, *ret_string;
	char *b, *p, *s, *t, *h;

	a_string = SMB_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 [e-mail] 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, const 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, const 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)
{
	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, "", current_user.gid,
			      smb_user_name, str, len);
}