/**
* 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 TFTP URI from next-server and filename
*
* @v next_server Next-server address
* @v port Port number, or zero to use the default port
* @v filename Filename
* @ret uri URI, or NULL on failure
*
* 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 * tftp_uri ( struct in_addr next_server, unsigned int port,
const char *filename ) {
char buf[ 6 /* "65535" + NUL */ ];
struct uri uri;
memset ( &uri, 0, sizeof ( uri ) );
uri.scheme = "tftp";
uri.host = inet_ntoa ( next_server );
if ( port ) {
snprintf ( buf, sizeof ( buf ), "%d", port );
uri.port = buf;
}
uri.path = filename;
return uri_dup ( &uri );
}
/**
* Construct TFTP URI from server address and filename
*
* @v sa_server Server address
* @v filename Filename
* @ret uri URI, or NULL on failure
*/
static struct uri * tftp_uri ( struct sockaddr *sa_server,
const char *filename ) {
struct sockaddr_tcpip *st_server =
( ( struct sockaddr_tcpip * ) sa_server );
char buf[ 6 /* "65535" + NUL */ ];
char *path;
struct uri tmp;
struct uri *uri = NULL;
/* Initialise TFTP URI */
memset ( &tmp, 0, sizeof ( tmp ) );
tmp.scheme = "tftp";
/* Construct TFTP server address */
tmp.host = sock_ntoa ( sa_server );
if ( ! tmp.host )
goto err_host;
/* Construct TFTP server port, if applicable */
if ( st_server->st_port ) {
snprintf ( buf, sizeof ( buf ), "%d",
ntohs ( st_server->st_port ) );
tmp.port = buf;
}
/* Construct TFTP path */
if ( asprintf ( &path, "/%s", filename ) < 0 )
goto err_path;
tmp.path = path;
/* Demangle URI */
uri = uri_dup ( &tmp );
if ( ! uri )
goto err_uri;
err_uri:
free ( path );
err_path:
err_host:
return uri;
}