[http] Support read-only HTTP block devices
Provide support for HTTP range requests, and expose this functionality
via the iPXE block device API. This allows SAN booting from a root
path such as:
sanboot http://boot.ipxe.org/freedos/fdfullcd.iso
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
parent
69f5b2e8dc
commit
2988b26653
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@ -44,14 +44,23 @@ FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/linebuf.h>
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#include <ipxe/features.h>
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#include <ipxe/base64.h>
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#include <ipxe/blockdev.h>
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#include <ipxe/acpi.h>
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#include <ipxe/http.h>
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FEATURE ( FEATURE_PROTOCOL, "HTTP", DHCP_EB_FEATURE_HTTP, 1 );
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/** HTTP transmission state */
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enum http_tx_state {
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HTTP_TX_REQUEST = 0,
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HTTP_TX_DONE,
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/** Block size used for HTTP block device request */
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#define HTTP_BLKSIZE 512
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/** HTTP flags */
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enum http_flags {
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/** Request is waiting to be transmitted */
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HTTP_TX_PENDING = 0x0001,
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/** Fetch header only */
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HTTP_HEAD_ONLY = 0x0002,
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/** Keep connection alive */
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HTTP_KEEPALIVE = 0x0004,
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};
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/** HTTP receive state */
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@ -61,6 +70,7 @@ enum http_rx_state {
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HTTP_RX_CHUNK_LEN,
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HTTP_RX_DATA,
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HTTP_RX_TRAILER,
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HTTP_RX_IDLE,
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HTTP_RX_DEAD,
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};
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@ -73,31 +83,38 @@ struct http_request {
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struct refcnt refcnt;
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/** Data transfer interface */
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struct interface xfer;
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/** Partial transfer interface */
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struct interface partial;
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/** URI being fetched */
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struct uri *uri;
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/** Transport layer interface */
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struct interface socket;
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/** Flags */
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unsigned int flags;
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/** Starting offset of partial transfer (if applicable) */
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size_t partial_start;
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/** Length of partial transfer (if applicable) */
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size_t partial_len;
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/** TX process */
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struct process process;
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/** TX state */
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enum http_tx_state tx_state;
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/** HTTP response code */
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unsigned int response;
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/** HTTP Content-Length */
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size_t content_length;
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/** HTTP is using Transfer-Encoding: chunked */
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int chunked;
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/** Current chunk length */
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size_t chunk_len;
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/** Received length */
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size_t rx_len;
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/** RX state */
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enum http_rx_state rx_state;
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/** Received length */
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size_t rx_len;
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/** Length remaining (or 0 if unknown) */
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size_t remaining;
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/** HTTP is using Transfer-Encoding: chunked */
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int chunked;
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/** Current chunk length remaining (if applicable) */
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size_t chunk_remaining;
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/** Line buffer for received header lines */
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struct line_buffer linebuf;
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/** Receive data buffer (if applicable) */
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userptr_t rx_buffer;
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};
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/**
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@ -115,12 +132,12 @@ static void http_free ( struct refcnt *refcnt ) {
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};
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/**
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* Mark HTTP request as complete
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* Close HTTP request
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*
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* @v http HTTP request
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* @v rc Return status code
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*/
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static void http_done ( struct http_request *http, int rc ) {
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static void http_close ( struct http_request *http, int rc ) {
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/* Prevent further processing of any current packet */
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http->rx_state = HTTP_RX_DEAD;
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@ -128,11 +145,11 @@ static void http_done ( struct http_request *http, int rc ) {
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/* If we had a Content-Length, and the received content length
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* isn't correct, flag an error
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*/
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if ( http->content_length &&
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( http->content_length != http->rx_len ) ) {
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if ( http->remaining != 0 ) {
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DBGC ( http, "HTTP %p incorrect length %zd, should be %zd\n",
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http, http->rx_len, http->content_length );
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rc = -EIO;
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http, http->rx_len, ( http->rx_len + http->remaining ) );
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if ( rc == 0 )
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rc = -EIO;
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}
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/* Remove process */
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@ -140,9 +157,40 @@ static void http_done ( struct http_request *http, int rc ) {
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/* Close all data transfer interfaces */
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intf_shutdown ( &http->socket, rc );
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intf_shutdown ( &http->partial, rc );
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intf_shutdown ( &http->xfer, rc );
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}
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/**
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* Mark HTTP request as completed successfully
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*
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* @v http HTTP request
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*/
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static void http_done ( struct http_request *http ) {
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/* If we had a Content-Length, and the received content length
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* isn't correct, force an error
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*/
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if ( http->remaining != 0 ) {
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http_close ( http, -EIO );
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return;
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}
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/* Enter idle state */
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http->rx_state = HTTP_RX_IDLE;
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http->rx_len = 0;
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assert ( http->remaining == 0 );
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assert ( http->chunked == 0 );
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assert ( http->chunk_remaining == 0 );
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/* Close partial transfer interface */
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intf_restart ( &http->partial, 0 );
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/* Close everything unless we are keeping the connection alive */
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if ( ! ( http->flags & HTTP_KEEPALIVE ) )
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http_close ( http, 0 );
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}
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/**
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* Convert HTTP response code to return status code
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*
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@ -152,6 +200,7 @@ static void http_done ( struct http_request *http, int rc ) {
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static int http_response_to_rc ( unsigned int response ) {
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switch ( response ) {
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case 200:
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case 206:
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case 301:
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case 302:
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return 0;
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@ -175,6 +224,7 @@ static int http_response_to_rc ( unsigned int response ) {
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*/
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static int http_rx_response ( struct http_request *http, char *response ) {
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char *spc;
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unsigned int code;
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int rc;
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DBGC ( http, "HTTP %p response \"%s\"\n", http, response );
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@ -187,8 +237,8 @@ static int http_rx_response ( struct http_request *http, char *response ) {
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spc = strchr ( response, ' ' );
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if ( ! spc )
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return -EIO;
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http->response = strtoul ( spc, NULL, 10 );
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if ( ( rc = http_response_to_rc ( http->response ) ) != 0 )
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code = strtoul ( spc, NULL, 10 );
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if ( ( rc = http_response_to_rc ( code ) ) != 0 )
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return rc;
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/* Move to received headers */
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@ -227,19 +277,40 @@ static int http_rx_location ( struct http_request *http, const char *value ) {
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*/
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static int http_rx_content_length ( struct http_request *http,
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const char *value ) {
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struct block_device_capacity capacity;
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size_t content_len;
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char *endp;
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http->content_length = strtoul ( value, &endp, 10 );
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/* Parse content length */
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content_len = strtoul ( value, &endp, 10 );
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if ( *endp != '\0' ) {
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DBGC ( http, "HTTP %p invalid Content-Length \"%s\"\n",
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http, value );
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return -EIO;
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}
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/* If we already have an expected content length, and this
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* isn't it, then complain
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*/
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if ( http->remaining && ( http->remaining != content_len ) ) {
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DBGC ( http, "HTTP %p incorrect Content-Length %zd (expected "
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"%zd)\n", http, content_len, http->remaining );
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return -EIO;
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}
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if ( ! ( http->flags & HTTP_HEAD_ONLY ) )
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http->remaining = content_len;
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/* Use seek() to notify recipient of filesize */
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xfer_seek ( &http->xfer, http->content_length );
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xfer_seek ( &http->xfer, http->remaining );
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xfer_seek ( &http->xfer, 0 );
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/* Report block device capacity if applicable */
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if ( http->flags & HTTP_HEAD_ONLY ) {
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capacity.blocks = ( content_len / HTTP_BLKSIZE );
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capacity.blksize = HTTP_BLKSIZE;
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capacity.max_count = -1U;
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block_capacity ( &http->partial, &capacity );
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}
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return 0;
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}
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@ -309,14 +380,15 @@ static int http_rx_header ( struct http_request *http, char *header ) {
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/* An empty header line marks the end of this phase */
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if ( ! header[0] ) {
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empty_line_buffer ( &http->linebuf );
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if ( http->rx_state == HTTP_RX_HEADER ) {
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if ( ( http->rx_state == HTTP_RX_HEADER ) &&
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( ! ( http->flags & HTTP_HEAD_ONLY ) ) ) {
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DBGC ( http, "HTTP %p start of data\n", http );
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http->rx_state = ( http->chunked ?
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HTTP_RX_CHUNK_LEN : HTTP_RX_DATA );
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return 0;
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} else {
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DBGC ( http, "HTTP %p end of trailer\n", http );
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http_done ( http, 0 );
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http_done ( http );
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return 0;
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}
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}
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@ -358,7 +430,7 @@ static int http_rx_chunk_len ( struct http_request *http, char *length ) {
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return 0;
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/* Parse chunk length */
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http->chunk_len = strtoul ( length, &endp, 16 );
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http->chunk_remaining = strtoul ( length, &endp, 16 );
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if ( *endp != '\0' ) {
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DBGC ( http, "HTTP %p invalid chunk length \"%s\"\n",
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http, length );
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@ -366,7 +438,7 @@ static int http_rx_chunk_len ( struct http_request *http, char *length ) {
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}
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/* Terminate chunked encoding if applicable */
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if ( http->chunk_len == 0 ) {
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if ( http->chunk_remaining == 0 ) {
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DBGC ( http, "HTTP %p end of chunks\n", http );
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http->chunked = 0;
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http->rx_state = HTTP_RX_TRAILER;
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@ -375,8 +447,8 @@ static int http_rx_chunk_len ( struct http_request *http, char *length ) {
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/* Use seek() to notify recipient of new filesize */
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DBGC ( http, "HTTP %p start of chunk of length %zd\n",
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http, http->chunk_len );
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xfer_seek ( &http->xfer, ( http->rx_len + http->chunk_len ) );
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http, http->chunk_remaining );
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xfer_seek ( &http->xfer, ( http->rx_len + http->chunk_remaining ) );
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xfer_seek ( &http->xfer, http->rx_len );
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/* Start receiving data */
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@ -422,34 +494,60 @@ static int http_socket_deliver ( struct http_request *http,
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int rc = 0;
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while ( iobuf && iob_len ( iobuf ) ) {
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switch ( http->rx_state ) {
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case HTTP_RX_IDLE:
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/* Receiving any data in this state is an error */
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DBGC ( http, "HTTP %p received %zd bytes while %s\n",
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http, iob_len ( iobuf ),
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( ( http->rx_state == HTTP_RX_IDLE ) ?
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"idle" : "dead" ) );
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rc = -EPROTO;
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goto done;
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case HTTP_RX_DEAD:
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/* Do no further processing */
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goto done;
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case HTTP_RX_DATA:
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/* Pass received data to caller */
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data_len = iob_len ( iobuf );
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if ( http->chunk_len && ( http->chunk_len < data_len )){
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data_len = http->chunk_len;
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if ( http->chunk_remaining &&
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( http->chunk_remaining < data_len ) ) {
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data_len = http->chunk_remaining;
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}
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if ( http->remaining &&
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( http->remaining < data_len ) ) {
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data_len = http->remaining;
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}
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if ( http->rx_buffer != UNULL ) {
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/* Copy to partial transfer buffer */
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copy_to_user ( http->rx_buffer, http->rx_len,
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iobuf->data, data_len );
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iob_pull ( iobuf, data_len );
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} else if ( data_len < iob_len ( iobuf ) ) {
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/* Deliver partial buffer as raw data */
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rc = xfer_deliver_raw ( &http->xfer,
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iobuf->data, data_len );
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iob_pull ( iobuf, data_len );
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if ( rc != 0 )
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goto done;
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} else {
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rc = xfer_deliver_iob ( &http->xfer,
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iob_disown ( iobuf ) );
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}
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if ( rc != 0 )
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goto done;
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if ( http->chunk_len ) {
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http->chunk_len -= data_len;
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if ( http->chunk_len == 0 )
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http->rx_state = HTTP_RX_CHUNK_LEN;
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/* Deliver whole I/O buffer */
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if ( ( rc = xfer_deliver_iob ( &http->xfer,
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iob_disown ( iobuf ) ) ) != 0 )
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goto done;
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}
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http->rx_len += data_len;
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if ( http->content_length &&
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( http->rx_len >= http->content_length ) ) {
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http_done ( http, 0 );
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goto done;
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if ( http->chunk_remaining ) {
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http->chunk_remaining -= data_len;
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if ( http->chunk_remaining == 0 )
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http->rx_state = HTTP_RX_CHUNK_LEN;
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}
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if ( http->remaining ) {
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http->remaining -= data_len;
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if ( ( http->remaining == 0 ) &&
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( http->rx_state == HTTP_RX_DATA ) ) {
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http_done ( http );
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}
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}
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break;
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case HTTP_RX_RESPONSE:
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@ -483,11 +581,25 @@ static int http_socket_deliver ( struct http_request *http,
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done:
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if ( rc )
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http_done ( http, rc );
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http_close ( http, rc );
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free_iob ( iobuf );
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return rc;
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}
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/**
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* Check HTTP socket flow control window
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*
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* @v http HTTP request
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* @ret len Length of window
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*/
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static size_t http_socket_window ( struct http_request *http __unused ) {
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/* Window is always open. This is to prevent TCP from
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* stalling if our parent window is not currently open.
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*/
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return ( ~( ( size_t ) 0 ) );
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}
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/**
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* HTTP process
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*
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@ -507,9 +619,11 @@ static void http_step ( struct http_request *http ) {
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int request_len = unparse_uri ( NULL, 0, http->uri,
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URI_PATH_BIT | URI_QUERY_BIT );
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char request[ request_len + 1 /* NUL */ ];
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char range[48]; /* Enough for two 64-bit integers in decimal */
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int partial;
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/* Do nothing if we have already transmitted the request */
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if ( http->tx_state != HTTP_TX_REQUEST )
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if ( ! ( http->flags & HTTP_TX_PENDING ) )
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return;
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/* Do nothing until socket is ready */
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@ -530,32 +644,151 @@ static void http_step ( struct http_request *http ) {
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base64_encode ( user_pw, user_pw_len, user_pw_base64 );
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}
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/* Force a HEAD request if we have nowhere to send any received data */
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if ( ( xfer_window ( &http->xfer ) == 0 ) &&
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( http->rx_buffer == UNULL ) ) {
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http->flags |= ( HTTP_HEAD_ONLY | HTTP_KEEPALIVE );
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}
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/* Determine type of request */
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partial = ( http->partial_len != 0 );
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snprintf ( range, sizeof ( range ), "%d-%d", http->partial_start,
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( http->partial_start + http->partial_len - 1 ) );
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/* Mark request as transmitted */
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http->tx_state = HTTP_TX_DONE;
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http->flags &= ~HTTP_TX_PENDING;
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/* Send GET request */
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if ( ( rc = xfer_printf ( &http->socket,
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"GET %s%s HTTP/1.1\r\n"
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"%s %s%s HTTP/1.1\r\n"
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"User-Agent: iPXE/" VERSION "\r\n"
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"%s%s%s"
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"Host: %s\r\n"
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"%s%s%s%s%s%s%s"
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"\r\n",
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http->uri->path ? "" : "/",
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request,
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( ( http->flags & HTTP_HEAD_ONLY ) ?
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"HEAD" : "GET" ),
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( http->uri->path ? "" : "/" ),
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request, host,
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( ( http->flags & HTTP_KEEPALIVE ) ?
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"Connection: Keep-Alive\r\n" : "" ),
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( partial ? "Range: bytes=" : "" ),
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( partial ? range : "" ),
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( partial ? "\r\n" : "" ),
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( user ?
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"Authorization: Basic " : "" ),
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( user ? user_pw_base64 : "" ),
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( user ? "\r\n" : "" ),
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host ) ) != 0 ) {
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http_done ( http, rc );
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( user ? "\r\n" : "" ) ) ) != 0 ) {
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http_close ( http, rc );
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}
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}
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/**
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* Check HTTP data transfer flow control window
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*
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* @v http HTTP request
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* @ret len Length of window
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*/
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static size_t http_xfer_window ( struct http_request *http ) {
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/* New block commands may be issued only when we are idle */
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return ( ( http->rx_state == HTTP_RX_IDLE ) ? 1 : 0 );
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}
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|
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/**
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* Initiate HTTP partial read
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*
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* @v http HTTP request
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* @v partial Partial transfer interface
|
||||
* @v offset Starting offset
|
||||
* @v buffer Data buffer
|
||||
* @v len Length
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int http_partial_read ( struct http_request *http,
|
||||
struct interface *partial,
|
||||
size_t offset, userptr_t buffer, size_t len ) {
|
||||
|
||||
/* Sanity check */
|
||||
if ( http_xfer_window ( http ) == 0 )
|
||||
return -EBUSY;
|
||||
|
||||
/* Initialise partial transfer parameters */
|
||||
http->rx_buffer = buffer;
|
||||
http->partial_start = offset;
|
||||
http->partial_len = len;
|
||||
http->remaining = len;
|
||||
|
||||
/* Schedule request */
|
||||
http->rx_state = HTTP_RX_RESPONSE;
|
||||
http->flags = ( HTTP_TX_PENDING | HTTP_KEEPALIVE );
|
||||
if ( ! len )
|
||||
http->flags |= HTTP_HEAD_ONLY;
|
||||
process_add ( &http->process );
|
||||
|
||||
/* Attach to parent interface and return */
|
||||
intf_plug_plug ( &http->partial, partial );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Issue HTTP block device read
|
||||
*
|
||||
* @v http HTTP request
|
||||
* @v block Block data interface
|
||||
* @v lba Starting logical block address
|
||||
* @v count Number of blocks to transfer
|
||||
* @v buffer Data buffer
|
||||
* @v len Length of data buffer
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int http_block_read ( struct http_request *http,
|
||||
struct interface *block,
|
||||
uint64_t lba, unsigned int count,
|
||||
userptr_t buffer, size_t len __unused ) {
|
||||
|
||||
return http_partial_read ( http, block, ( lba * HTTP_BLKSIZE ),
|
||||
buffer, ( count * HTTP_BLKSIZE ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* Read HTTP block device capacity
|
||||
*
|
||||
* @v http HTTP request
|
||||
* @v block Block data interface
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int http_block_read_capacity ( struct http_request *http,
|
||||
struct interface *block ) {
|
||||
|
||||
return http_partial_read ( http, block, 0, 0, 0 );
|
||||
}
|
||||
|
||||
/**
|
||||
* Describe HTTP device in an ACPI table
|
||||
*
|
||||
* @v http HTTP request
|
||||
* @v acpi ACPI table
|
||||
* @v len Length of ACPI table
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int http_acpi_describe ( struct http_request *http,
|
||||
struct acpi_description_header *acpi,
|
||||
size_t len ) {
|
||||
|
||||
DBGC ( http, "HTTP %p cannot yet describe device in an ACPI table\n",
|
||||
http );
|
||||
( void ) acpi;
|
||||
( void ) len;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** HTTP socket interface operations */
|
||||
static struct interface_operation http_socket_operations[] = {
|
||||
INTF_OP ( xfer_window, struct http_request *, http_socket_window ),
|
||||
INTF_OP ( xfer_deliver, struct http_request *, http_socket_deliver ),
|
||||
INTF_OP ( xfer_window_changed, struct http_request *, http_step ),
|
||||
INTF_OP ( intf_close, struct http_request *, http_done ),
|
||||
INTF_OP ( intf_close, struct http_request *, http_close ),
|
||||
};
|
||||
|
||||
/** HTTP socket interface descriptor */
|
||||
|
|
@ -563,9 +796,23 @@ static struct interface_descriptor http_socket_desc =
|
|||
INTF_DESC_PASSTHRU ( struct http_request, socket,
|
||||
http_socket_operations, xfer );
|
||||
|
||||
/** HTTP partial transfer interface operations */
|
||||
static struct interface_operation http_partial_operations[] = {
|
||||
INTF_OP ( intf_close, struct http_request *, http_close ),
|
||||
};
|
||||
|
||||
/** HTTP partial transfer interface descriptor */
|
||||
static struct interface_descriptor http_partial_desc =
|
||||
INTF_DESC ( struct http_request, partial, http_partial_operations );
|
||||
|
||||
/** HTTP data transfer interface operations */
|
||||
static struct interface_operation http_xfer_operations[] = {
|
||||
INTF_OP ( intf_close, struct http_request *, http_done ),
|
||||
INTF_OP ( xfer_window, struct http_request *, http_xfer_window ),
|
||||
INTF_OP ( block_read, struct http_request *, http_block_read ),
|
||||
INTF_OP ( block_read_capacity, struct http_request *,
|
||||
http_block_read_capacity ),
|
||||
INTF_OP ( intf_close, struct http_request *, http_close ),
|
||||
INTF_OP ( acpi_describe, struct http_request *, http_acpi_describe ),
|
||||
};
|
||||
|
||||
/** HTTP data transfer interface descriptor */
|
||||
|
|
@ -605,9 +852,11 @@ int http_open_filter ( struct interface *xfer, struct uri *uri,
|
|||
return -ENOMEM;
|
||||
ref_init ( &http->refcnt, http_free );
|
||||
intf_init ( &http->xfer, &http_xfer_desc, &http->refcnt );
|
||||
intf_init ( &http->partial, &http_partial_desc, &http->refcnt );
|
||||
http->uri = uri_get ( uri );
|
||||
intf_init ( &http->socket, &http_socket_desc, &http->refcnt );
|
||||
process_init ( &http->process, &http_process_desc, &http->refcnt );
|
||||
http->flags = HTTP_TX_PENDING;
|
||||
|
||||
/* Open socket */
|
||||
memset ( &server, 0, sizeof ( server ) );
|
||||
|
|
@ -630,7 +879,7 @@ int http_open_filter ( struct interface *xfer, struct uri *uri,
|
|||
err:
|
||||
DBGC ( http, "HTTP %p could not create request: %s\n",
|
||||
http, strerror ( rc ) );
|
||||
http_done ( http, rc );
|
||||
http_close ( http, rc );
|
||||
ref_put ( &http->refcnt );
|
||||
return rc;
|
||||
}
|
||||
|
|
|
|||
Reference in New Issue