/**
* Resolve base+relative URI
*
* @v base_uri Base URI, or NULL
* @v relative_uri Relative URI
* @ret resolved_uri Resolved URI
*
* Takes a base URI (e.g. "http://etherboot.org/kernels/vmlinuz" and a
* relative URI (e.g. "../initrds/initrd.gz") and produces a new URI
* (e.g. "http://etherboot.org/initrds/initrd.gz").
*/
struct uri * resolve_uri ( struct uri *base_uri,
struct uri *relative_uri ) {
struct uri tmp_uri;
char *tmp_path = NULL;
struct uri *new_uri;
/* If relative URI is absolute, just re-use it */
if ( uri_is_absolute ( relative_uri ) || ( ! base_uri ) )
return uri_get ( relative_uri );
/* Mangle URI */
memcpy ( &tmp_uri, base_uri, sizeof ( tmp_uri ) );
if ( relative_uri->path ) {
tmp_path = resolve_path ( ( base_uri->path ?
base_uri->path : "/" ),
relative_uri->path );
tmp_uri.path = tmp_path;
tmp_uri.query = relative_uri->query;
tmp_uri.fragment = relative_uri->fragment;
} else if ( relative_uri->query ) {
tmp_uri.query = relative_uri->query;
tmp_uri.fragment = relative_uri->fragment;
} else if ( relative_uri->fragment ) {
tmp_uri.fragment = relative_uri->fragment;
}
/* Create demangled URI */
new_uri = uri_dup ( &tmp_uri );
free ( tmp_path );
return new_uri;
}
/**
* Construct URI from server address and filename
*
* @v sa_server Server address
* @v filename Filename
* @ret uri URI, or NULL on failure
*
* PXE TFTP filenames specified via the DHCP next-server field often
* contain characters such as ':' or '#' which would confuse the
* generic URI parser. We provide a mechanism for directly
* constructing a TFTP URI from the next-server and filename.
*/
struct uri * pxe_uri ( struct sockaddr *sa_server, const char *filename ) {
struct uri *uri;
/* Fail if filename is empty */
if ( ! ( filename && filename[0] ) )
return NULL;
/* If filename is a hierarchical absolute URI, then use that
* URI. (We accept only hierarchical absolute URIs, since PXE
* filenames sometimes start with DOS drive letters such as
* "C:\", which get misinterpreted as opaque absolute URIs.)
*/
uri = parse_uri ( filename );
if ( uri && uri_is_absolute ( uri ) && ( ! uri->opaque ) )
return uri;
uri_put ( uri );
/* Otherwise, construct a TFTP URI directly */
return tftp_uri ( sa_server, filename );
}
