f6a8158eed
separate xfer method. Add missing .alloc_iob entries to several xfer_interface_operations structures.
535 lines
13 KiB
C
535 lines
13 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/**
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* @file
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*
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* Hyper Text Transfer Protocol (HTTP)
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <byteswap.h>
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#include <errno.h>
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#include <assert.h>
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#include <gpxe/uri.h>
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#include <gpxe/refcnt.h>
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#include <gpxe/iobuf.h>
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#include <gpxe/xfer.h>
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#include <gpxe/open.h>
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#include <gpxe/socket.h>
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#include <gpxe/tcpip.h>
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#include <gpxe/process.h>
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#include <gpxe/linebuf.h>
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#include <gpxe/features.h>
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#include <gpxe/http.h>
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FEATURE ( FEATURE_PROTOCOL, "HTTP", DHCP_EB_FEATURE_HTTP, 1 );
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/** HTTP receive state */
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enum http_rx_state {
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HTTP_RX_RESPONSE = 0,
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HTTP_RX_HEADER,
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HTTP_RX_DATA,
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HTTP_RX_DEAD,
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};
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/**
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* An HTTP request
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*
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*/
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struct http_request {
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/** Reference count */
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struct refcnt refcnt;
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/** Data transfer interface */
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struct xfer_interface xfer;
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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 xfer_interface socket;
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/** TX process */
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struct process process;
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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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/** 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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/** Line buffer for received header lines */
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struct line_buffer linebuf;
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};
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/**
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* Free HTTP request
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*
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* @v refcnt Reference counter
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*/
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static void http_free ( struct refcnt *refcnt ) {
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struct http_request *http =
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container_of ( refcnt, struct http_request, refcnt );
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uri_put ( http->uri );
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empty_line_buffer ( &http->linebuf );
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free ( http );
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};
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/**
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* Mark HTTP request as complete
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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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/* Prevent further processing of any current packet */
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http->rx_state = HTTP_RX_DEAD;
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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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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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}
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/* Remove process */
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process_del ( &http->process );
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/* Close all data transfer interfaces */
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xfer_nullify ( &http->socket );
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xfer_close ( &http->socket, rc );
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xfer_nullify ( &http->xfer );
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xfer_close ( &http->xfer, rc );
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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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* @v response HTTP response code
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* @ret rc Return status code
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*/
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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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return 0;
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case 404:
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return -ENOENT;
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case 403:
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return -EPERM;
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default:
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return -EIO;
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}
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}
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/**
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* Handle HTTP response
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*
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* @v http HTTP request
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* @v response HTTP response
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* @ret rc Return status code
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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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int rc;
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DBGC ( http, "HTTP %p response \"%s\"\n", http, response );
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/* Check response starts with "HTTP/" */
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if ( strncmp ( response, "HTTP/", 5 ) != 0 )
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return -EIO;
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/* Locate and check response code */
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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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return rc;
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/* Move to received headers */
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http->rx_state = HTTP_RX_HEADER;
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return 0;
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}
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/**
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* Handle HTTP Content-Length header
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*
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* @v http HTTP request
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* @v value HTTP header value
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* @ret rc Return status code
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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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char *endp;
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http->content_length = 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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/* Use seek() to notify recipient of filesize */
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xfer_seek ( &http->xfer, http->content_length, SEEK_SET );
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xfer_seek ( &http->xfer, 0, SEEK_SET );
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return 0;
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}
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/** An HTTP header handler */
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struct http_header_handler {
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/** Name (e.g. "Content-Length") */
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const char *header;
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/** Handle received header
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*
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* @v http HTTP request
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* @v value HTTP header value
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* @ret rc Return status code
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*
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* If an error is returned, the download will be aborted.
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*/
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int ( * rx ) ( struct http_request *http, const char *value );
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};
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/** List of HTTP header handlers */
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static struct http_header_handler http_header_handlers[] = {
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{
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.header = "Content-Length",
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.rx = http_rx_content_length,
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},
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{ NULL, NULL }
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};
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/**
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* Handle HTTP header
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*
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* @v http HTTP request
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* @v header HTTP header
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* @ret rc Return status code
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*/
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static int http_rx_header ( struct http_request *http, char *header ) {
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struct http_header_handler *handler;
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char *separator;
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char *value;
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int rc;
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/* An empty header line marks the transition to the data phase */
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if ( ! header[0] ) {
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DBGC ( http, "HTTP %p start of data\n", http );
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empty_line_buffer ( &http->linebuf );
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http->rx_state = HTTP_RX_DATA;
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return 0;
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}
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DBGC ( http, "HTTP %p header \"%s\"\n", http, header );
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/* Split header at the ": " */
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separator = strstr ( header, ": " );
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if ( ! separator ) {
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DBGC ( http, "HTTP %p malformed header\n", http );
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return -EIO;
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}
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*separator = '\0';
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value = ( separator + 2 );
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/* Hand off to header handler, if one exists */
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for ( handler = http_header_handlers ; handler->header ; handler++ ) {
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if ( strcasecmp ( header, handler->header ) == 0 ) {
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if ( ( rc = handler->rx ( http, value ) ) != 0 )
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return rc;
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break;
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}
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}
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return 0;
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}
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/** An HTTP line-based data handler */
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struct http_line_handler {
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/** Handle line
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*
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* @v http HTTP request
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* @v line Line to handle
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* @ret rc Return status code
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*/
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int ( * rx ) ( struct http_request *http, char *line );
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};
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/** List of HTTP line-based data handlers */
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static struct http_line_handler http_line_handlers[] = {
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[HTTP_RX_RESPONSE] = { .rx = http_rx_response },
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[HTTP_RX_HEADER] = { .rx = http_rx_header },
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};
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/**
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* Handle new data arriving via HTTP connection in the data phase
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*
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* @v http HTTP request
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* @v iobuf I/O buffer
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* @ret rc Return status code
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*/
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static int http_rx_data ( struct http_request *http,
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struct io_buffer *iobuf ) {
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int rc;
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/* Update received length */
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http->rx_len += iob_len ( iobuf );
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/* Hand off data buffer */
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if ( ( rc = xfer_deliver_iob ( &http->xfer, iobuf ) ) != 0 )
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return rc;
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/* If we have reached the content-length, stop now */
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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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}
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return 0;
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}
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/**
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* Handle new data arriving via HTTP connection
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*
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* @v socket Transport layer interface
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* @v iobuf I/O buffer
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* @v meta Data transfer metadata, or NULL
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* @ret rc Return status code
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*/
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static int http_socket_deliver_iob ( struct xfer_interface *socket,
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struct io_buffer *iobuf,
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struct xfer_metadata *meta __unused ) {
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struct http_request *http =
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container_of ( socket, struct http_request, socket );
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struct http_line_handler *lh;
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char *line;
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ssize_t len;
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int rc = 0;
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while ( iob_len ( iobuf ) ) {
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switch ( http->rx_state ) {
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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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/* Once we're into the data phase, just fill
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* the data buffer
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*/
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rc = http_rx_data ( http, iobuf );
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iobuf = NULL;
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goto done;
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case HTTP_RX_RESPONSE:
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case HTTP_RX_HEADER:
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/* In the other phases, buffer and process a
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* line at a time
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*/
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len = line_buffer ( &http->linebuf, iobuf->data,
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iob_len ( iobuf ) );
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if ( len < 0 ) {
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rc = len;
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DBGC ( http, "HTTP %p could not buffer line: "
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"%s\n", http, strerror ( rc ) );
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goto done;
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}
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iob_pull ( iobuf, len );
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line = buffered_line ( &http->linebuf );
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if ( line ) {
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lh = &http_line_handlers[http->rx_state];
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if ( ( rc = lh->rx ( http, line ) ) != 0 )
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goto done;
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}
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break;
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default:
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assert ( 0 );
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break;
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}
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}
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done:
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if ( rc )
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http_done ( 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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* HTTP process
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*
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* @v process Process
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*/
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static void http_step ( struct process *process ) {
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struct http_request *http =
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container_of ( process, struct http_request, process );
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const char *path = http->uri->path;
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const char *host = http->uri->host;
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const char *query = http->uri->query;
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int rc;
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if ( xfer_window ( &http->socket ) ) {
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process_del ( &http->process );
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if ( ( rc = xfer_printf ( &http->socket,
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"GET %s%s%s HTTP/1.1\r\n"
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"User-Agent: gPXE/" VERSION "\r\n"
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"Host: %s\r\n"
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"\r\n",
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( path ? path : "/" ),
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( query ? "?" : "" ),
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( query ? query : "" ),
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host ) ) != 0 ) {
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http_done ( http, rc );
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}
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}
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}
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/**
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* HTTP connection closed by network stack
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*
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* @v socket Transport layer interface
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* @v rc Reason for close
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*/
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static void http_socket_close ( struct xfer_interface *socket, int rc ) {
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struct http_request *http =
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container_of ( socket, struct http_request, socket );
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DBGC ( http, "HTTP %p socket closed: %s\n",
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http, strerror ( rc ) );
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http_done ( http, rc );
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}
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/** HTTP socket operations */
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static struct xfer_interface_operations http_socket_operations = {
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.close = http_socket_close,
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.vredirect = xfer_vopen,
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.window = unlimited_xfer_window,
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.alloc_iob = default_xfer_alloc_iob,
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.deliver_iob = http_socket_deliver_iob,
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.deliver_raw = xfer_deliver_as_iob,
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};
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/**
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* Close HTTP data transfer interface
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*
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* @v xfer Data transfer interface
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* @v rc Reason for close
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*/
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static void http_xfer_close ( struct xfer_interface *xfer, int rc ) {
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struct http_request *http =
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container_of ( xfer, struct http_request, xfer );
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DBGC ( http, "HTTP %p interface closed: %s\n",
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http, strerror ( rc ) );
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http_done ( http, rc );
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}
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/** HTTP data transfer interface operations */
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static struct xfer_interface_operations http_xfer_operations = {
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.close = http_xfer_close,
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.vredirect = ignore_xfer_vredirect,
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.window = unlimited_xfer_window,
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.alloc_iob = default_xfer_alloc_iob,
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.deliver_iob = xfer_deliver_as_raw,
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.deliver_raw = ignore_xfer_deliver_raw,
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};
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/**
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* Initiate an HTTP connection, with optional filter
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*
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* @v xfer Data transfer interface
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* @v uri Uniform Resource Identifier
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* @v default_port Default port number
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* @v filter Filter to apply to socket, or NULL
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* @ret rc Return status code
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*/
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int http_open_filter ( struct xfer_interface *xfer, struct uri *uri,
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unsigned int default_port,
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int ( * filter ) ( struct xfer_interface *xfer,
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struct xfer_interface **next ) ) {
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struct http_request *http;
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struct sockaddr_tcpip server;
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struct xfer_interface *socket;
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int rc;
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/* Sanity checks */
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if ( ! uri->host )
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return -EINVAL;
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/* Allocate and populate HTTP structure */
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http = zalloc ( sizeof ( *http ) );
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if ( ! http )
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return -ENOMEM;
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http->refcnt.free = http_free;
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xfer_init ( &http->xfer, &http_xfer_operations, &http->refcnt );
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http->uri = uri_get ( uri );
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xfer_init ( &http->socket, &http_socket_operations, &http->refcnt );
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process_init ( &http->process, http_step, &http->refcnt );
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/* Open socket */
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memset ( &server, 0, sizeof ( server ) );
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server.st_port = htons ( uri_port ( http->uri, default_port ) );
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socket = &http->socket;
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if ( filter ) {
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if ( ( rc = filter ( socket, &socket ) ) != 0 )
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goto err;
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}
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if ( ( rc = xfer_open_named_socket ( socket, SOCK_STREAM,
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( struct sockaddr * ) &server,
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uri->host, NULL ) ) != 0 )
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goto err;
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/* Attach to parent interface, mortalise self, and return */
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xfer_plug_plug ( &http->xfer, xfer );
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ref_put ( &http->refcnt );
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return 0;
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err:
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DBGC ( http, "HTTP %p could not create request: %s\n",
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http, strerror ( rc ) );
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http_done ( http, rc );
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ref_put ( &http->refcnt );
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return rc;
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}
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/**
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* Initiate an HTTP connection
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*
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* @v xfer Data transfer interface
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* @v uri Uniform Resource Identifier
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* @ret rc Return status code
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*/
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static int http_open ( struct xfer_interface *xfer, struct uri *uri ) {
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return http_open_filter ( xfer, uri, HTTP_PORT, NULL );
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}
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/** HTTP URI opener */
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struct uri_opener http_uri_opener __uri_opener = {
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.scheme = "http",
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.open = http_open,
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};
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