Add more function input validation checks

darcs-hash:20060608235212-ac50b-25fd55f96356af65d4da1eec100cc954b4a9f81e.gz

builtin.c

@@ -2946,6 +2946,12 @@ void builtin_destroy()
 
 int builtin_exists( wchar_t *cmd )
 {
+	if( !cmd )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 0;
+	}
+	
 	/*
 	  Count is not a builtin, but it's help is handled internally by
 	  fish, so it is in the hash_table_t.
@@ -2976,6 +2982,13 @@ static int internal_help( wchar_t *cmd )
 int builtin_run( wchar_t **argv )
 {
 	int (*cmd)(wchar_t **argv)=0;
+	
+	if( !argv || !argv[0] )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}	
+	
 	cmd = (int (*)(wchar_t **))hash_get( &builtin, argv[0] );
 
 	if( argv[1] != 0 && !internal_help(argv[0]) )
@@ -3005,11 +3018,23 @@ int builtin_run( wchar_t **argv )
 
 void builtin_get_names( array_list_t *list )
 {
+	if( !list )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return;
+	}
+	
  	hash_get_keys( &builtin, list );
 }
 
 const wchar_t *builtin_get_desc( const wchar_t *b )
 {
+	if( !b )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 0;
+	}
+	
 
 	if( !desc )
 	{

builtin_set.c

@@ -159,6 +159,13 @@ static int my_env_set( const wchar_t *key, array_list_t *val, int scope )
 			retcode=1;
 			break;
 		}
+		
+		case ENV_INVALID:
+		{
+			sb_printf( sb_err, _(L"%ls: Unknown error"), L"set" );
+			retcode=1;
+			break;
+		}
 	}
 
 	sb_destroy( &sb );

common.c

@@ -336,7 +336,7 @@ char **wcsv2strv( const wchar_t **in )
 
 wchar_t *wcsdupcat( const wchar_t *a, const wchar_t *b )
 {
-	return wcsdupcat2( a, b, 0 );
+	return wcsdupcat2( a, b, (void *)0 );
 }
 
 wchar_t *wcsdupcat2( const wchar_t *a, ... )
@@ -498,10 +498,10 @@ int contains_str( const wchar_t *a, ... )
 
 	if( !a )
 	{
-		debug( 1, L"Warning: Called contains_str with null argument. This is a bug." );		
+		debug( 0, L"%s called with null input", __func__ );
 		return 0;
 	}
-	
+
 	va_start( va, a );
 	while( (arg=va_arg(va, wchar_t *) )!= 0 ) 
 	{
@@ -547,6 +547,12 @@ void debug( int level, const wchar_t *msg, ... )
 	string_buffer_t sb;
 	string_buffer_t sb2;
 	
+	if( !msg )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return;
+	}
+	
 	if( level > debug_level )
 		return;
 
@@ -573,6 +579,12 @@ void write_screen( const wchar_t *msg, string_buffer_t *buff )
 	int tok_width = 0;
 	int screen_width = common_get_width();
 	
+	if( !msg || !buff )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return;
+	}
+	
 	if( screen_width )
 	{
 		start = pos = msg;
@@ -656,8 +668,18 @@ void write_screen( const wchar_t *msg, string_buffer_t *buff )
 wchar_t *escape( const wchar_t *in, 
 				 int escape_all )
 {
-	wchar_t *out = malloc( sizeof(wchar_t)*(wcslen(in)*4 + 1));
-	wchar_t *pos=out;
+	wchar_t *out;
+	wchar_t *pos;
+
+	if( !in )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		exit(1);
+	}
+	
+	out = malloc( sizeof(wchar_t)*(wcslen(in)*4 + 1));
+	pos = out;
+	
 	if( !out )
 		die_mem();
 	
@@ -764,11 +786,22 @@ wchar_t *unescape( const wchar_t * orig, int unescape_special )
 {
 	
 	int mode = 0; 
-	int in_pos, out_pos, len = wcslen( orig );
+	int in_pos, out_pos, len;
 	int c;
 	int bracket_count=0;
 	wchar_t prev=0;	
-	wchar_t *in = wcsdup(orig);
+	wchar_t *in;
+
+	if( !orig )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		exit(1);
+	}
+	
+	len = wcslen( orig );
+	in = wcsdup( orig );
+
+
 	if( !in )
 		die_mem();
 	

env.c

@@ -623,6 +623,12 @@ int env_set( const wchar_t *key,
 	event_t ev;
 	int is_universal = 0;	
 
+	if( !key )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return ENV_INVALID;
+	}
+	
 	if( (var_mode & ENV_USER ) && 
 		hash_get( &env_read_only, key ) )
 	{
@@ -867,6 +873,12 @@ int env_remove( const wchar_t *key, int var_mode )
 	env_node_t *first_node;
 	int erased = 0;
 	
+	if( !key )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}
+	
 	if( (var_mode & ENV_USER ) && 
 		hash_get( &env_read_only, key ) )
 	{
@@ -925,6 +937,12 @@ wchar_t *env_get( const wchar_t *key )
 	env_node_t *env = top;
 	wchar_t *item;
 	
+	if( !key )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 0;
+	}
+	
 	if( wcscmp( key, L"history" ) == 0 )
 	{
 		wchar_t *current;
@@ -1023,9 +1041,15 @@ int env_exist( const wchar_t *key, int mode )
 	env_node_t *env;
 	wchar_t *item=0;
 
+	if( !key )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 0;
+	}
+	
 	/*
 	  Read only variables all exist, and they are all global. A local
-	  varion can not exist.
+	  version can not exist.
 	*/
 	if( ! (mode & ENV_LOCAL) && ! (mode & ENV_UNIVERSAL) )
 	{

env.h

@@ -44,7 +44,12 @@
 /**
    Error code for trying to alter read-only variable
 */
-#define ENV_PERM 1
+enum{
+	ENV_PERM = 1,
+	ENV_INVALID
+}
+;
+
 
 /**
    Initialize environment variable data
@@ -71,7 +76,7 @@ void env_destroy();
    The current error codes are:
 
    * ENV_PERM, can only be returned when setting as a user, e.g. ENV_USER is set. This means that the user tried to change a read-only variable.
-
+   * ENV_INVALID, the variable name or mode was invalid
 */
 
 int env_set( const wchar_t *key, 

exec.c

@@ -652,6 +652,12 @@ void exec( job_t *j )
 	*/
 	int exec_error=0;
 
+	if( !j )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return;
+	}
+	
 	if( no_exec )
 		return;
 	

fallback.h

@@ -17,9 +17,9 @@
 #endif
 
 /**
-   Make sure __func__ is defined to some string. This should be the
-   currently compiled function, but not all compilers support this
-   feature.
+   Make sure __func__ is defined to some string. In C99, this should
+   be the currently compiled function. If we aren't using C99 or
+   later, older versions of GCC had __FUNCTION__.
 */
 #if __STDC_VERSION__ < 199901L
 # if __GNUC__ >= 2

parser.c

@@ -711,6 +711,12 @@ wchar_t *get_filename( const wchar_t *cmd )
 {
 	wchar_t *path;
 
+	if( !cmd )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 0;
+	}
+	
 	debug( 3, L"get_filename( '%ls' )", cmd );
 
 	if(wcschr( cmd, L'/' ) != 0 )
@@ -964,6 +970,12 @@ int eval_args( const wchar_t *line, array_list_t *args )
 	int previous_pos=current_tokenizer_pos;
 	int do_loop=1;
 
+	if( !line || !args )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}
+	
 	proc_push_interactive(0);	
 	current_tokenizer = &tok;
 	current_tokenizer_pos = 0;
@@ -1035,9 +1047,22 @@ int eval_args( const wchar_t *line, array_list_t *args )
 
 void parser_stack_trace( block_t *b, string_buffer_t *buff)
 {
+	
+	/*
+	  Validate input
+	*/
+	if( !buff )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return;
+	}
+	
+	/*
+	  Check if we should end the recursion
+	*/
 	if( !b )
 		return;
-	
+
 	if( b->type==EVENT )
 	{
 		sb_printf( buff, _(L"in event handler: %ls\n"), event_get_desc( b->param1.event ));
@@ -2592,9 +2617,17 @@ static int parser_test_argument( const wchar_t *arg, string_buffer_t *out, const
 	int err=0;
 	
 	const wchar_t *paran_begin, *paran_end;
-	wchar_t *arg_cpy = wcsdup( arg );
+	wchar_t *arg_cpy;
 	int do_loop = 1;
 	
+	if( !arg )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}
+	
+	arg_cpy = wcsdup( arg );
+	
 	while( do_loop )
 	{
 		switch( parse_util_locate_cmdsubst(arg_cpy,
@@ -2747,6 +2780,12 @@ int parser_test_args(const  wchar_t * buff,
 	int do_loop = 1;
 	int err = 0;
 	
+	if( !buff )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}
+	
 	current_tokenizer = &tok;
 	
 	for( tok_init( &tok, buff, 0 );
@@ -2835,10 +2874,17 @@ int parser_test( const  wchar_t * buff,
 	   Set to one if an additional process specification is needed 
 	*/
 	int needs_cmd=0; 
-	void *context = halloc( 0, 0 );
+	void *context;
 	int arg_count=0;
 	wchar_t *cmd=0;
 		
+	if( !buff )
+	{
+		debug( 0, L"%s called with null input", __func__ );
+		return 1;
+	}
+	
+	context = halloc( 0, 0 );
 	current_tokenizer = &tok;
 
 	for( tok_init( &tok, buff, 0 );