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- /*
- * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- /**
- * @file
- *
- * Hyper Text Transfer Protocol (HTTP) core functionality
- *
- */
-
- #include <stdint.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <strings.h>
- #include <byteswap.h>
- #include <errno.h>
- #include <ctype.h>
- #include <assert.h>
- #include <ipxe/uri.h>
- #include <ipxe/refcnt.h>
- #include <ipxe/iobuf.h>
- #include <ipxe/xfer.h>
- #include <ipxe/open.h>
- #include <ipxe/socket.h>
- #include <ipxe/tcpip.h>
- #include <ipxe/process.h>
- #include <ipxe/retry.h>
- #include <ipxe/timer.h>
- #include <ipxe/linebuf.h>
- #include <ipxe/base64.h>
- #include <ipxe/base16.h>
- #include <ipxe/md5.h>
- #include <ipxe/blockdev.h>
- #include <ipxe/acpi.h>
- #include <ipxe/version.h>
- #include <ipxe/params.h>
- #include <ipxe/profile.h>
- #include <ipxe/http.h>
-
- /* Disambiguate the various error causes */
- #define EACCES_401 __einfo_error ( EINFO_EACCES_401 )
- #define EINFO_EACCES_401 \
- __einfo_uniqify ( EINFO_EACCES, 0x01, "HTTP 401 Unauthorized" )
- #define EIO_OTHER __einfo_error ( EINFO_EIO_OTHER )
- #define EINFO_EIO_OTHER \
- __einfo_uniqify ( EINFO_EIO, 0x01, "Unrecognised HTTP response code" )
- #define EIO_CONTENT_LENGTH __einfo_error ( EINFO_EIO_CONTENT_LENGTH )
- #define EINFO_EIO_CONTENT_LENGTH \
- __einfo_uniqify ( EINFO_EIO, 0x02, "Content length mismatch" )
- #define EINVAL_RESPONSE __einfo_error ( EINFO_EINVAL_RESPONSE )
- #define EINFO_EINVAL_RESPONSE \
- __einfo_uniqify ( EINFO_EINVAL, 0x01, "Invalid content length" )
- #define EINVAL_HEADER __einfo_error ( EINFO_EINVAL_HEADER )
- #define EINFO_EINVAL_HEADER \
- __einfo_uniqify ( EINFO_EINVAL, 0x02, "Invalid header" )
- #define EINVAL_CONTENT_LENGTH __einfo_error ( EINFO_EINVAL_CONTENT_LENGTH )
- #define EINFO_EINVAL_CONTENT_LENGTH \
- __einfo_uniqify ( EINFO_EINVAL, 0x03, "Invalid content length" )
- #define EINVAL_CHUNK_LENGTH __einfo_error ( EINFO_EINVAL_CHUNK_LENGTH )
- #define EINFO_EINVAL_CHUNK_LENGTH \
- __einfo_uniqify ( EINFO_EINVAL, 0x04, "Invalid chunk length" )
- #define ENOENT_404 __einfo_error ( EINFO_ENOENT_404 )
- #define EINFO_ENOENT_404 \
- __einfo_uniqify ( EINFO_ENOENT, 0x01, "HTTP 404 Not Found" )
- #define EPERM_403 __einfo_error ( EINFO_EPERM_403 )
- #define EINFO_EPERM_403 \
- __einfo_uniqify ( EINFO_EPERM, 0x01, "HTTP 403 Forbidden" )
- #define EPROTO_UNSOLICITED __einfo_error ( EINFO_EPROTO_UNSOLICITED )
- #define EINFO_EPROTO_UNSOLICITED \
- __einfo_uniqify ( EINFO_EPROTO, 0x01, "Unsolicited data" )
-
- /** Block size used for HTTP block device request */
- #define HTTP_BLKSIZE 512
-
- /** Retry delay used when we cannot understand the Retry-After header */
- #define HTTP_RETRY_SECONDS 5
-
- /** Receive profiler */
- static struct profiler http_rx_profiler __profiler = { .name = "http.rx" };
-
- /** Data transfer profiler */
- static struct profiler http_xfer_profiler __profiler = { .name = "http.xfer" };
-
- /** HTTP flags */
- enum http_flags {
- /** Request is waiting to be transmitted */
- HTTP_TX_PENDING = 0x0001,
- /** Fetch header only */
- HTTP_HEAD_ONLY = 0x0002,
- /** Client would like to keep connection alive */
- HTTP_CLIENT_KEEPALIVE = 0x0004,
- /** Server will keep connection alive */
- HTTP_SERVER_KEEPALIVE = 0x0008,
- /** Discard the current request and try again */
- HTTP_TRY_AGAIN = 0x0010,
- /** Provide Basic authentication details */
- HTTP_BASIC_AUTH = 0x0020,
- /** Provide Digest authentication details */
- HTTP_DIGEST_AUTH = 0x0040,
- /** Include qop parameter in Digest authentication reponse */
- HTTP_DIGEST_AUTH_QOP = 0x0080,
- /** Use MD5-sess algorithm for Digest authentication */
- HTTP_DIGEST_AUTH_MD5_SESS = 0x0100,
- /** Socket must be reopened */
- HTTP_REOPEN_SOCKET = 0x0200,
- };
-
- /** HTTP receive state */
- enum http_rx_state {
- HTTP_RX_RESPONSE = 0,
- HTTP_RX_HEADER,
- HTTP_RX_CHUNK_LEN,
- /* In HTTP_RX_DATA, it is acceptable for the server to close
- * the connection (unless we are in the middle of a chunked
- * transfer).
- */
- HTTP_RX_DATA,
- /* In the following states, it is acceptable for the server to
- * close the connection.
- */
- HTTP_RX_TRAILER,
- HTTP_RX_IDLE,
- HTTP_RX_DEAD,
- };
-
- /**
- * An HTTP request
- *
- */
- struct http_request {
- /** Reference count */
- struct refcnt refcnt;
- /** Data transfer interface */
- struct interface xfer;
- /** Partial transfer interface */
- struct interface partial;
-
- /** URI being fetched */
- struct uri *uri;
- /** Default port */
- unsigned int default_port;
- /** Filter (if any) */
- int ( * filter ) ( struct interface *xfer,
- const char *name,
- struct interface **next );
- /** Transport layer interface */
- struct interface socket;
-
- /** Flags */
- unsigned int flags;
- /** Starting offset of partial transfer (if applicable) */
- size_t partial_start;
- /** Length of partial transfer (if applicable) */
- size_t partial_len;
-
- /** TX process */
- struct process process;
-
- /** RX state */
- enum http_rx_state rx_state;
- /** Response code */
- unsigned int code;
- /** Received length */
- size_t rx_len;
- /** Length remaining (or 0 if unknown) */
- size_t remaining;
- /** HTTP is using Transfer-Encoding: chunked */
- int chunked;
- /** Current chunk length remaining (if applicable) */
- size_t chunk_remaining;
- /** Line buffer for received header lines */
- struct line_buffer linebuf;
- /** Receive data buffer (if applicable) */
- userptr_t rx_buffer;
-
- /** Authentication realm (if any) */
- char *auth_realm;
- /** Authentication nonce (if any) */
- char *auth_nonce;
- /** Authentication opaque string (if any) */
- char *auth_opaque;
-
- /** Request retry timer */
- struct retry_timer timer;
- /** Retry delay (in timer ticks) */
- unsigned long retry_delay;
- };
-
- /**
- * Free HTTP request
- *
- * @v refcnt Reference counter
- */
- static void http_free ( struct refcnt *refcnt ) {
- struct http_request *http =
- container_of ( refcnt, struct http_request, refcnt );
-
- uri_put ( http->uri );
- empty_line_buffer ( &http->linebuf );
- free ( http->auth_realm );
- free ( http->auth_nonce );
- free ( http->auth_opaque );
- free ( http );
- };
-
- /**
- * Close HTTP request
- *
- * @v http HTTP request
- * @v rc Return status code
- */
- static void http_close ( struct http_request *http, int rc ) {
-
- /* Prevent further processing of any current packet */
- http->rx_state = HTTP_RX_DEAD;
-
- /* Prevent reconnection */
- http->flags &= ~HTTP_CLIENT_KEEPALIVE;
-
- /* Remove process */
- process_del ( &http->process );
-
- /* Close all data transfer interfaces */
- intf_shutdown ( &http->socket, rc );
- intf_shutdown ( &http->partial, rc );
- intf_shutdown ( &http->xfer, rc );
- }
-
- /**
- * Open HTTP socket
- *
- * @v http HTTP request
- * @ret rc Return status code
- */
- static int http_socket_open ( struct http_request *http ) {
- struct uri *uri = http->uri;
- struct sockaddr_tcpip server;
- struct interface *socket;
- int rc;
-
- /* Open socket */
- memset ( &server, 0, sizeof ( server ) );
- server.st_port = htons ( uri_port ( uri, http->default_port ) );
- socket = &http->socket;
- if ( http->filter ) {
- if ( ( rc = http->filter ( socket, uri->host, &socket ) ) != 0 )
- return rc;
- }
- if ( ( rc = xfer_open_named_socket ( socket, SOCK_STREAM,
- ( struct sockaddr * ) &server,
- uri->host, NULL ) ) != 0 )
- return rc;
-
- return 0;
- }
-
- /**
- * Retry HTTP request
- *
- * @v timer Retry timer
- * @v fail Failure indicator
- */
- static void http_retry ( struct retry_timer *timer, int fail __unused ) {
- struct http_request *http =
- container_of ( timer, struct http_request, timer );
- int rc;
-
- /* Reopen socket if required */
- if ( http->flags & HTTP_REOPEN_SOCKET ) {
- http->flags &= ~HTTP_REOPEN_SOCKET;
- DBGC ( http, "HTTP %p reopening connection\n", http );
- if ( ( rc = http_socket_open ( http ) ) != 0 ) {
- http_close ( http, rc );
- return;
- }
- }
-
- /* Retry the request if applicable */
- if ( http->flags & HTTP_TRY_AGAIN ) {
- http->flags &= ~HTTP_TRY_AGAIN;
- DBGC ( http, "HTTP %p retrying request\n", http );
- http->flags |= HTTP_TX_PENDING;
- http->rx_state = HTTP_RX_RESPONSE;
- process_add ( &http->process );
- }
- }
-
- /**
- * Mark HTTP request as completed successfully
- *
- * @v http HTTP request
- */
- static void http_done ( struct http_request *http ) {
-
- /* If we are not at an appropriate stage of the protocol
- * (including being in the middle of a chunked transfer),
- * force an error.
- */
- if ( ( http->rx_state < HTTP_RX_DATA ) || ( http->chunked != 0 ) ) {
- DBGC ( http, "HTTP %p connection closed unexpectedly in state "
- "%d\n", http, http->rx_state );
- http_close ( http, -ECONNRESET );
- return;
- }
-
- /* If we had a Content-Length, and the received content length
- * isn't correct, force an error
- */
- if ( http->remaining != 0 ) {
- DBGC ( http, "HTTP %p incorrect length %zd, should be %zd\n",
- http, http->rx_len, ( http->rx_len + http->remaining ) );
- http_close ( http, -EIO_CONTENT_LENGTH );
- return;
- }
-
- /* Enter idle state */
- http->rx_state = HTTP_RX_IDLE;
- http->rx_len = 0;
- assert ( http->remaining == 0 );
- assert ( http->chunked == 0 );
- assert ( http->chunk_remaining == 0 );
-
- /* Close partial transfer interface */
- if ( ! ( http->flags & HTTP_TRY_AGAIN ) )
- intf_restart ( &http->partial, 0 );
-
- /* Close everything unless we want to keep the connection alive */
- if ( ! ( http->flags & ( HTTP_CLIENT_KEEPALIVE | HTTP_TRY_AGAIN ) ) ) {
- http_close ( http, 0 );
- return;
- }
-
- /* If the server is not intending to keep the connection
- * alive, then close the socket and mark it as requiring
- * reopening.
- */
- if ( ! ( http->flags & HTTP_SERVER_KEEPALIVE ) ) {
- intf_restart ( &http->socket, 0 );
- http->flags &= ~HTTP_SERVER_KEEPALIVE;
- http->flags |= HTTP_REOPEN_SOCKET;
- }
-
- /* Start request retry timer */
- start_timer_fixed ( &http->timer, http->retry_delay );
- http->retry_delay = 0;
- }
-
- /**
- * Convert HTTP response code to return status code
- *
- * @v response HTTP response code
- * @ret rc Return status code
- */
- static int http_response_to_rc ( unsigned int response ) {
- switch ( response ) {
- case 200:
- case 206:
- case 301:
- case 302:
- case 303:
- return 0;
- case 404:
- return -ENOENT_404;
- case 403:
- return -EPERM_403;
- case 401:
- return -EACCES_401;
- default:
- return -EIO_OTHER;
- }
- }
-
- /**
- * Handle HTTP response
- *
- * @v http HTTP request
- * @v response HTTP response
- * @ret rc Return status code
- */
- static int http_rx_response ( struct http_request *http, char *response ) {
- char *spc;
-
- DBGC ( http, "HTTP %p response \"%s\"\n", http, response );
-
- /* Check response starts with "HTTP/" */
- if ( strncmp ( response, "HTTP/", 5 ) != 0 )
- return -EINVAL_RESPONSE;
-
- /* Locate and store response code */
- spc = strchr ( response, ' ' );
- if ( ! spc )
- return -EINVAL_RESPONSE;
- http->code = strtoul ( spc, NULL, 10 );
-
- /* Move to receive headers */
- http->rx_state = ( ( http->flags & HTTP_HEAD_ONLY ) ?
- HTTP_RX_TRAILER : HTTP_RX_HEADER );
- return 0;
- }
-
- /**
- * Handle HTTP Location header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_location ( struct http_request *http, char *value ) {
- int rc;
-
- /* Redirect to new location */
- DBGC ( http, "HTTP %p redirecting to %s\n", http, value );
- if ( ( rc = xfer_redirect ( &http->xfer, LOCATION_URI_STRING,
- value ) ) != 0 ) {
- DBGC ( http, "HTTP %p could not redirect: %s\n",
- http, strerror ( rc ) );
- return rc;
- }
-
- return 0;
- }
-
- /**
- * Handle HTTP Content-Length header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_content_length ( struct http_request *http, char *value ) {
- struct block_device_capacity capacity;
- size_t content_len;
- char *endp;
-
- /* Parse content length */
- content_len = strtoul ( value, &endp, 10 );
- if ( ! ( ( *endp == '\0' ) || isspace ( *endp ) ) ) {
- DBGC ( http, "HTTP %p invalid Content-Length \"%s\"\n",
- http, value );
- return -EINVAL_CONTENT_LENGTH;
- }
-
- /* If we already have an expected content length, and this
- * isn't it, then complain
- */
- if ( http->remaining && ( http->remaining != content_len ) ) {
- DBGC ( http, "HTTP %p incorrect Content-Length %zd (expected "
- "%zd)\n", http, content_len, http->remaining );
- return -EIO_CONTENT_LENGTH;
- }
- if ( ! ( http->flags & HTTP_HEAD_ONLY ) )
- http->remaining = content_len;
-
- /* Do nothing more if we are retrying the request */
- if ( http->flags & HTTP_TRY_AGAIN )
- return 0;
-
- /* Use seek() to notify recipient of filesize */
- xfer_seek ( &http->xfer, http->remaining );
- xfer_seek ( &http->xfer, 0 );
-
- /* Report block device capacity if applicable */
- if ( http->flags & HTTP_HEAD_ONLY ) {
- capacity.blocks = ( content_len / HTTP_BLKSIZE );
- capacity.blksize = HTTP_BLKSIZE;
- capacity.max_count = -1U;
- block_capacity ( &http->partial, &capacity );
- }
- return 0;
- }
-
- /**
- * Handle HTTP Transfer-Encoding header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_transfer_encoding ( struct http_request *http, char *value ){
-
- if ( strcasecmp ( value, "chunked" ) == 0 ) {
- /* Mark connection as using chunked transfer encoding */
- http->chunked = 1;
- }
-
- return 0;
- }
-
- /**
- * Handle HTTP Connection header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_connection ( struct http_request *http, char *value ) {
-
- if ( strcasecmp ( value, "keep-alive" ) == 0 ) {
- /* Mark connection as being kept alive by the server */
- http->flags |= HTTP_SERVER_KEEPALIVE;
- }
-
- return 0;
- }
-
- /**
- * Handle WWW-Authenticate Basic header
- *
- * @v http HTTP request
- * @v params Parameters
- * @ret rc Return status code
- */
- static int http_rx_basic_auth ( struct http_request *http, char *params ) {
-
- DBGC ( http, "HTTP %p Basic authentication required (%s)\n",
- http, params );
-
- /* If we received a 401 Unauthorized response, then retry
- * using Basic authentication
- */
- if ( ( http->code == 401 ) &&
- ( ! ( http->flags & HTTP_BASIC_AUTH ) ) &&
- ( http->uri->user != NULL ) ) {
- http->flags |= ( HTTP_TRY_AGAIN | HTTP_BASIC_AUTH );
- }
-
- return 0;
- }
-
- /**
- * Parse Digest authentication parameter
- *
- * @v params Parameters
- * @v name Parameter name (including trailing "=\"")
- * @ret value Parameter value, or NULL
- */
- static char * http_digest_param ( char *params, const char *name ) {
- char *key;
- char *value;
- char *terminator;
-
- /* Locate parameter */
- key = strstr ( params, name );
- if ( ! key )
- return NULL;
-
- /* Extract value */
- value = ( key + strlen ( name ) );
- terminator = strchr ( value, '"' );
- if ( ! terminator )
- return NULL;
- return strndup ( value, ( terminator - value ) );
- }
-
- /**
- * Handle WWW-Authenticate Digest header
- *
- * @v http HTTP request
- * @v params Parameters
- * @ret rc Return status code
- */
- static int http_rx_digest_auth ( struct http_request *http, char *params ) {
-
- DBGC ( http, "HTTP %p Digest authentication required (%s)\n",
- http, params );
-
- /* If we received a 401 Unauthorized response, then retry
- * using Digest authentication
- */
- if ( ( http->code == 401 ) &&
- ( ! ( http->flags & HTTP_DIGEST_AUTH ) ) &&
- ( http->uri->user != NULL ) ) {
-
- /* Extract realm */
- free ( http->auth_realm );
- http->auth_realm = http_digest_param ( params, "realm=\"" );
- if ( ! http->auth_realm ) {
- DBGC ( http, "HTTP %p Digest prompt missing realm\n",
- http );
- return -EINVAL_HEADER;
- }
-
- /* Extract nonce */
- free ( http->auth_nonce );
- http->auth_nonce = http_digest_param ( params, "nonce=\"" );
- if ( ! http->auth_nonce ) {
- DBGC ( http, "HTTP %p Digest prompt missing nonce\n",
- http );
- return -EINVAL_HEADER;
- }
-
- /* Extract opaque */
- free ( http->auth_opaque );
- http->auth_opaque = http_digest_param ( params, "opaque=\"" );
- if ( ! http->auth_opaque ) {
- /* Not an error; "opaque" is optional */
- }
-
- /* Check for presence of qop */
- if ( strstr ( params, "qop=\"" ) != NULL )
- http->flags |= HTTP_DIGEST_AUTH_QOP;
-
- /* Check for MD5-sess. For some bizarre reason,
- * RFC2617 requires this to be unquoted, which means
- * that http_digest_param() cannot be used.
- */
- if ( strstr ( params, "algorithm=MD5-sess" ) != NULL )
- http->flags |= HTTP_DIGEST_AUTH_MD5_SESS;
-
- /* Retry using digest authentication */
- http->flags |= ( HTTP_TRY_AGAIN | HTTP_DIGEST_AUTH );
- }
-
- return 0;
- }
-
- /** An HTTP WWW-Authenticate header handler */
- struct http_auth_header_handler {
- /** Scheme (e.g. "Basic") */
- const char *scheme;
- /** Handle received parameters
- *
- * @v http HTTP request
- * @v params Parameters
- * @ret rc Return status code
- */
- int ( * rx ) ( struct http_request *http, char *params );
- };
-
- /** List of HTTP WWW-Authenticate header handlers */
- static struct http_auth_header_handler http_auth_header_handlers[] = {
- {
- .scheme = "Basic",
- .rx = http_rx_basic_auth,
- },
- {
- .scheme = "Digest",
- .rx = http_rx_digest_auth,
- },
- { NULL, NULL },
- };
-
- /**
- * Handle HTTP WWW-Authenticate header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_www_authenticate ( struct http_request *http, char *value ) {
- struct http_auth_header_handler *handler;
- char *separator;
- char *scheme;
- char *params;
- int rc;
-
- /* Extract scheme */
- separator = strchr ( value, ' ' );
- if ( ! separator ) {
- DBGC ( http, "HTTP %p malformed WWW-Authenticate header\n",
- http );
- return -EINVAL_HEADER;
- }
- *separator = '\0';
- scheme = value;
- params = ( separator + 1 );
-
- /* Hand off to header handler, if one exists */
- for ( handler = http_auth_header_handlers; handler->scheme; handler++ ){
- if ( strcasecmp ( scheme, handler->scheme ) == 0 ) {
- if ( ( rc = handler->rx ( http, params ) ) != 0 )
- return rc;
- break;
- }
- }
- return 0;
- }
-
- /**
- * Handle HTTP Retry-After header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- */
- static int http_rx_retry_after ( struct http_request *http, char *value ) {
- unsigned long seconds;
- char *endp;
-
- DBGC ( http, "HTTP %p retry requested (%s)\n", http, value );
-
- /* If we received a 503 Service Unavailable response, then
- * retry after the specified number of seconds. If the value
- * is not a simple number of seconds (e.g. a full HTTP date),
- * then retry after a fixed delay, since we don't have code
- * able to parse full HTTP dates.
- */
- if ( http->code == 503 ) {
- seconds = strtoul ( value, &endp, 10 );
- if ( *endp != '\0' ) {
- seconds = HTTP_RETRY_SECONDS;
- DBGC ( http, "HTTP %p cannot understand \"%s\"; "
- "using %ld seconds\n", http, value, seconds );
- }
- http->flags |= HTTP_TRY_AGAIN;
- http->retry_delay = ( seconds * TICKS_PER_SEC );
- }
-
- return 0;
- }
-
- /** An HTTP header handler */
- struct http_header_handler {
- /** Name (e.g. "Content-Length") */
- const char *header;
- /** Handle received header
- *
- * @v http HTTP request
- * @v value HTTP header value
- * @ret rc Return status code
- *
- * If an error is returned, the download will be aborted.
- */
- int ( * rx ) ( struct http_request *http, char *value );
- };
-
- /** List of HTTP header handlers */
- static struct http_header_handler http_header_handlers[] = {
- {
- .header = "Location",
- .rx = http_rx_location,
- },
- {
- .header = "Content-Length",
- .rx = http_rx_content_length,
- },
- {
- .header = "Transfer-Encoding",
- .rx = http_rx_transfer_encoding,
- },
- {
- .header = "Connection",
- .rx = http_rx_connection,
- },
- {
- .header = "WWW-Authenticate",
- .rx = http_rx_www_authenticate,
- },
- {
- .header = "Retry-After",
- .rx = http_rx_retry_after,
- },
- { NULL, NULL }
- };
-
- /**
- * Handle HTTP header
- *
- * @v http HTTP request
- * @v header HTTP header
- * @ret rc Return status code
- */
- static int http_rx_header ( struct http_request *http, char *header ) {
- struct http_header_handler *handler;
- char *separator;
- char *value;
- int rc;
-
- /* An empty header line marks the end of this phase */
- if ( ! header[0] ) {
- empty_line_buffer ( &http->linebuf );
-
- /* Handle response code */
- if ( ! ( http->flags & HTTP_TRY_AGAIN ) ) {
- if ( ( rc = http_response_to_rc ( http->code ) ) != 0 )
- return rc;
- }
-
- /* Move to next state */
- if ( http->rx_state == HTTP_RX_HEADER ) {
- DBGC ( http, "HTTP %p start of data\n", http );
- http->rx_state = ( http->chunked ?
- HTTP_RX_CHUNK_LEN : HTTP_RX_DATA );
- if ( ( http->partial_len != 0 ) &&
- ( ! ( http->flags & HTTP_TRY_AGAIN ) ) ) {
- http->remaining = http->partial_len;
- }
- return 0;
- } else {
- DBGC ( http, "HTTP %p end of trailer\n", http );
- http_done ( http );
- return 0;
- }
- }
-
- DBGC ( http, "HTTP %p header \"%s\"\n", http, header );
-
- /* Split header at the ": " */
- separator = strstr ( header, ": " );
- if ( ! separator ) {
- DBGC ( http, "HTTP %p malformed header\n", http );
- return -EINVAL_HEADER;
- }
- *separator = '\0';
- value = ( separator + 2 );
-
- /* Hand off to header handler, if one exists */
- for ( handler = http_header_handlers ; handler->header ; handler++ ) {
- if ( strcasecmp ( header, handler->header ) == 0 ) {
- if ( ( rc = handler->rx ( http, value ) ) != 0 )
- return rc;
- break;
- }
- }
- return 0;
- }
-
- /**
- * Handle HTTP chunk length
- *
- * @v http HTTP request
- * @v length HTTP chunk length
- * @ret rc Return status code
- */
- static int http_rx_chunk_len ( struct http_request *http, char *length ) {
- char *endp;
-
- /* Skip blank lines between chunks */
- if ( length[0] == '\0' )
- return 0;
-
- /* Parse chunk length */
- http->chunk_remaining = strtoul ( length, &endp, 16 );
- if ( *endp != '\0' ) {
- DBGC ( http, "HTTP %p invalid chunk length \"%s\"\n",
- http, length );
- return -EINVAL_CHUNK_LENGTH;
- }
-
- /* Terminate chunked encoding if applicable */
- if ( http->chunk_remaining == 0 ) {
- DBGC ( http, "HTTP %p end of chunks\n", http );
- http->chunked = 0;
- http->rx_state = HTTP_RX_TRAILER;
- return 0;
- }
-
- /* Use seek() to notify recipient of new filesize */
- DBGC ( http, "HTTP %p start of chunk of length %zd\n",
- http, http->chunk_remaining );
- if ( ! ( http->flags & HTTP_TRY_AGAIN ) ) {
- xfer_seek ( &http->xfer,
- ( http->rx_len + http->chunk_remaining ) );
- xfer_seek ( &http->xfer, http->rx_len );
- }
-
- /* Start receiving data */
- http->rx_state = HTTP_RX_DATA;
-
- return 0;
- }
-
- /** An HTTP line-based data handler */
- struct http_line_handler {
- /** Handle line
- *
- * @v http HTTP request
- * @v line Line to handle
- * @ret rc Return status code
- */
- int ( * rx ) ( struct http_request *http, char *line );
- };
-
- /** List of HTTP line-based data handlers */
- static struct http_line_handler http_line_handlers[] = {
- [HTTP_RX_RESPONSE] = { .rx = http_rx_response },
- [HTTP_RX_HEADER] = { .rx = http_rx_header },
- [HTTP_RX_CHUNK_LEN] = { .rx = http_rx_chunk_len },
- [HTTP_RX_TRAILER] = { .rx = http_rx_header },
- };
-
- /**
- * Handle new data arriving via HTTP connection
- *
- * @v http HTTP request
- * @v iobuf I/O buffer
- * @v meta Data transfer metadata
- * @ret rc Return status code
- */
- static int http_socket_deliver ( struct http_request *http,
- struct io_buffer *iobuf,
- struct xfer_metadata *meta __unused ) {
- struct http_line_handler *lh;
- char *line;
- size_t data_len;
- ssize_t line_len;
- int rc = 0;
-
- profile_start ( &http_rx_profiler );
- while ( iobuf && iob_len ( iobuf ) ) {
-
- switch ( http->rx_state ) {
- case HTTP_RX_IDLE:
- /* Receiving any data in this state is an error */
- DBGC ( http, "HTTP %p received %zd bytes while %s\n",
- http, iob_len ( iobuf ),
- ( ( http->rx_state == HTTP_RX_IDLE ) ?
- "idle" : "dead" ) );
- rc = -EPROTO_UNSOLICITED;
- goto done;
- case HTTP_RX_DEAD:
- /* Do no further processing */
- goto done;
- case HTTP_RX_DATA:
- /* Pass received data to caller */
- data_len = iob_len ( iobuf );
- if ( http->chunk_remaining &&
- ( http->chunk_remaining < data_len ) ) {
- data_len = http->chunk_remaining;
- }
- if ( http->remaining &&
- ( http->remaining < data_len ) ) {
- data_len = http->remaining;
- }
- if ( http->flags & HTTP_TRY_AGAIN ) {
- /* Discard all received data */
- iob_pull ( iobuf, data_len );
- } else if ( http->rx_buffer != UNULL ) {
- /* Copy to partial transfer buffer */
- copy_to_user ( http->rx_buffer, http->rx_len,
- iobuf->data, data_len );
- iob_pull ( iobuf, data_len );
- } else if ( data_len < iob_len ( iobuf ) ) {
- /* Deliver partial buffer as raw data */
- profile_start ( &http_xfer_profiler );
- rc = xfer_deliver_raw ( &http->xfer,
- iobuf->data, data_len );
- iob_pull ( iobuf, data_len );
- if ( rc != 0 )
- goto done;
- profile_stop ( &http_xfer_profiler );
- } else {
- /* Deliver whole I/O buffer */
- profile_start ( &http_xfer_profiler );
- if ( ( rc = xfer_deliver_iob ( &http->xfer,
- iob_disown ( iobuf ) ) ) != 0 )
- goto done;
- profile_stop ( &http_xfer_profiler );
- }
- http->rx_len += data_len;
- if ( http->chunk_remaining ) {
- http->chunk_remaining -= data_len;
- if ( http->chunk_remaining == 0 )
- http->rx_state = HTTP_RX_CHUNK_LEN;
- }
- if ( http->remaining ) {
- http->remaining -= data_len;
- if ( ( http->remaining == 0 ) &&
- ( http->rx_state == HTTP_RX_DATA ) ) {
- http_done ( http );
- }
- }
- break;
- case HTTP_RX_RESPONSE:
- case HTTP_RX_HEADER:
- case HTTP_RX_CHUNK_LEN:
- case HTTP_RX_TRAILER:
- /* In the other phases, buffer and process a
- * line at a time
- */
- line_len = line_buffer ( &http->linebuf, iobuf->data,
- iob_len ( iobuf ) );
- if ( line_len < 0 ) {
- rc = line_len;
- DBGC ( http, "HTTP %p could not buffer line: "
- "%s\n", http, strerror ( rc ) );
- goto done;
- }
- iob_pull ( iobuf, line_len );
- line = buffered_line ( &http->linebuf );
- if ( line ) {
- lh = &http_line_handlers[http->rx_state];
- if ( ( rc = lh->rx ( http, line ) ) != 0 )
- goto done;
- }
- break;
- default:
- assert ( 0 );
- break;
- }
- }
-
- done:
- if ( rc )
- http_close ( http, rc );
- free_iob ( iobuf );
- profile_stop ( &http_rx_profiler );
- return rc;
- }
-
- /**
- * Check HTTP socket flow control window
- *
- * @v http HTTP request
- * @ret len Length of window
- */
- static size_t http_socket_window ( struct http_request *http __unused ) {
-
- /* Window is always open. This is to prevent TCP from
- * stalling if our parent window is not currently open.
- */
- return ( ~( ( size_t ) 0 ) );
- }
-
- /**
- * Close HTTP socket
- *
- * @v http HTTP request
- * @v rc Reason for close
- */
- static void http_socket_close ( struct http_request *http, int rc ) {
-
- /* If we have an error, terminate */
- if ( rc != 0 ) {
- http_close ( http, rc );
- return;
- }
-
- /* Mark HTTP request as complete */
- http_done ( http );
- }
-
- /**
- * Generate HTTP Basic authorisation string
- *
- * @v http HTTP request
- * @ret auth Authorisation string, or NULL on error
- *
- * The authorisation string is dynamically allocated, and must be
- * freed by the caller.
- */
- static char * http_basic_auth ( struct http_request *http ) {
- const char *user = http->uri->user;
- const char *password = ( http->uri->password ?
- http->uri->password : "" );
- size_t user_pw_len =
- ( strlen ( user ) + 1 /* ":" */ + strlen ( password ) );
- char user_pw[ user_pw_len + 1 /* NUL */ ];
- size_t user_pw_base64_len = base64_encoded_len ( user_pw_len );
- char user_pw_base64[ user_pw_base64_len + 1 /* NUL */ ];
- char *auth;
- int len;
-
- /* Sanity check */
- assert ( user != NULL );
-
- /* Make "user:password" string from decoded fields */
- snprintf ( user_pw, sizeof ( user_pw ), "%s:%s", user, password );
-
- /* Base64-encode the "user:password" string */
- base64_encode ( ( void * ) user_pw, user_pw_len, user_pw_base64 );
-
- /* Generate the authorisation string */
- len = asprintf ( &auth, "Authorization: Basic %s\r\n",
- user_pw_base64 );
- if ( len < 0 )
- return NULL;
-
- return auth;
- }
-
- /**
- * Initialise HTTP digest
- *
- * @v ctx Digest context
- * @v string Initial string
- */
- static void http_digest_init ( struct md5_context *ctx ) {
-
- digest_init ( &md5_algorithm, ctx );
- }
-
- /**
- * Update HTTP digest with new data
- *
- * @v ctx Digest context
- * @v string String to append
- */
- static void http_digest_update ( struct md5_context *ctx, const char *string ) {
- static const char colon = ':';
-
- if ( ctx->len )
- digest_update ( &md5_algorithm, ctx, &colon, sizeof ( colon ) );
- digest_update ( &md5_algorithm, ctx, string, strlen ( string ) );
- }
-
- /**
- * Finalise HTTP digest
- *
- * @v ctx Digest context
- * @v out Buffer for digest output
- * @v len Buffer length
- */
- static void http_digest_final ( struct md5_context *ctx, char *out,
- size_t len ) {
- uint8_t digest[MD5_DIGEST_SIZE];
-
- digest_final ( &md5_algorithm, ctx, digest );
- base16_encode ( digest, sizeof ( digest ), out, len );
- }
-
- /**
- * Generate HTTP Digest authorisation string
- *
- * @v http HTTP request
- * @v method HTTP method (e.g. "GET")
- * @v uri HTTP request URI (e.g. "/index.html")
- * @ret auth Authorisation string, or NULL on error
- *
- * The authorisation string is dynamically allocated, and must be
- * freed by the caller.
- */
- static char * http_digest_auth ( struct http_request *http,
- const char *method, const char *uri ) {
- const char *user = http->uri->user;
- const char *password = ( http->uri->password ?
- http->uri->password : "" );
- const char *realm = http->auth_realm;
- const char *nonce = http->auth_nonce;
- const char *opaque = http->auth_opaque;
- char cnonce[ 9 /* "xxxxxxxx" + NUL */ ];
- struct md5_context ctx;
- char ha1[ base16_encoded_len ( MD5_DIGEST_SIZE ) + 1 /* NUL */ ];
- char ha2[ base16_encoded_len ( MD5_DIGEST_SIZE ) + 1 /* NUL */ ];
- char response[ base16_encoded_len ( MD5_DIGEST_SIZE ) + 1 /* NUL */ ];
- int qop = ( http->flags & HTTP_DIGEST_AUTH_QOP );
- int md5sess = ( qop && ( http->flags & HTTP_DIGEST_AUTH_MD5_SESS ) );
- char *auth;
- int len;
-
- /* Sanity checks */
- assert ( user != NULL );
- assert ( realm != NULL );
- assert ( nonce != NULL );
-
- /* Generate a client nonce */
- snprintf ( cnonce, sizeof ( cnonce ), "%08lx", random() );
-
- /* Generate HA1 */
- http_digest_init ( &ctx );
- http_digest_update ( &ctx, user );
- http_digest_update ( &ctx, realm );
- http_digest_update ( &ctx, password );
- http_digest_final ( &ctx, ha1, sizeof ( ha1 ) );
- if ( md5sess ) {
- http_digest_init ( &ctx );
- http_digest_update ( &ctx, ha1 );
- http_digest_update ( &ctx, nonce );
- http_digest_update ( &ctx, cnonce );
- http_digest_final ( &ctx, ha1, sizeof ( ha1 ) );
- }
-
- /* Generate HA2 */
- http_digest_init ( &ctx );
- http_digest_update ( &ctx, method );
- http_digest_update ( &ctx, uri );
- http_digest_final ( &ctx, ha2, sizeof ( ha2 ) );
-
- /* Generate response */
- http_digest_init ( &ctx );
- http_digest_update ( &ctx, ha1 );
- http_digest_update ( &ctx, nonce );
- if ( qop ) {
- http_digest_update ( &ctx, "00000001" /* nc */ );
- http_digest_update ( &ctx, cnonce );
- http_digest_update ( &ctx, "auth" /* qop */ );
- }
- http_digest_update ( &ctx, ha2 );
- http_digest_final ( &ctx, response, sizeof ( response ) );
-
- /* Generate the authorisation string */
- len = asprintf ( &auth, "Authorization: Digest username=\"%s\", "
- "realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
- "%s%s%s%s%s%s%s%sresponse=\"%s\"\r\n",
- user, realm, nonce, uri,
- ( qop ? "qop=\"auth\", algorithm=" : "" ),
- ( qop ? ( md5sess ? "MD5-sess, " : "MD5, " ) : "" ),
- ( qop ? "nc=00000001, cnonce=\"" : "" ),
- ( qop ? cnonce : "" ),
- ( qop ? "\", " : "" ),
- ( opaque ? "opaque=\"" : "" ),
- ( opaque ? opaque : "" ),
- ( opaque ? "\", " : "" ), response );
- if ( len < 0 )
- return NULL;
-
- return auth;
- }
-
- /**
- * Generate HTTP POST parameter list
- *
- * @v http HTTP request
- * @v buf Buffer to contain HTTP POST parameters
- * @v len Length of buffer
- * @ret len Length of parameter list (excluding terminating NUL)
- */
- static size_t http_post_params ( struct http_request *http,
- char *buf, size_t len ) {
- struct parameter *param;
- ssize_t remaining = len;
- size_t frag_len;
-
- /* Add each parameter in the form "key=value", joined with "&" */
- len = 0;
- for_each_param ( param, http->uri->params ) {
-
- /* Add the "&", if applicable */
- if ( len ) {
- if ( remaining > 0 )
- *buf = '&';
- buf++;
- len++;
- remaining--;
- }
-
- /* URI-encode the key */
- frag_len = uri_encode ( param->key, 0, buf, remaining );
- buf += frag_len;
- len += frag_len;
- remaining -= frag_len;
-
- /* Add the "=" */
- if ( remaining > 0 )
- *buf = '=';
- buf++;
- len++;
- remaining--;
-
- /* URI-encode the value */
- frag_len = uri_encode ( param->value, 0, buf, remaining );
- buf += frag_len;
- len += frag_len;
- remaining -= frag_len;
- }
-
- /* Ensure string is NUL-terminated even if no parameters are present */
- if ( remaining > 0 )
- *buf = '\0';
-
- return len;
- }
-
- /**
- * Generate HTTP POST body
- *
- * @v http HTTP request
- * @ret post I/O buffer containing POST body, or NULL on error
- */
- static struct io_buffer * http_post ( struct http_request *http ) {
- struct io_buffer *post;
- size_t len;
- size_t check_len;
-
- /* Calculate length of parameter list */
- len = http_post_params ( http, NULL, 0 );
-
- /* Allocate parameter list */
- post = alloc_iob ( len + 1 /* NUL */ );
- if ( ! post )
- return NULL;
-
- /* Fill parameter list */
- check_len = http_post_params ( http, iob_put ( post, len ),
- ( len + 1 /* NUL */ ) );
- assert ( len == check_len );
- DBGC ( http, "HTTP %p POST %s\n", http, ( ( char * ) post->data ) );
-
- return post;
- }
-
- /**
- * HTTP process
- *
- * @v http HTTP request
- */
- static void http_step ( struct http_request *http ) {
- struct io_buffer *post;
- struct uri host_uri;
- struct uri path_uri;
- char *host_uri_string;
- char *path_uri_string;
- char *method;
- char *range;
- char *auth;
- char *content;
- int len;
- int rc;
-
- /* Do nothing if we have already transmitted the request */
- if ( ! ( http->flags & HTTP_TX_PENDING ) )
- return;
-
- /* Do nothing until socket is ready */
- if ( ! xfer_window ( &http->socket ) )
- return;
-
- /* Force a HEAD request if we have nowhere to send any received data */
- if ( ( xfer_window ( &http->xfer ) == 0 ) &&
- ( http->rx_buffer == UNULL ) ) {
- http->flags |= ( HTTP_HEAD_ONLY | HTTP_CLIENT_KEEPALIVE );
- }
-
- /* Determine method */
- method = ( ( http->flags & HTTP_HEAD_ONLY ) ? "HEAD" :
- ( http->uri->params ? "POST" : "GET" ) );
-
- /* Construct host URI */
- memset ( &host_uri, 0, sizeof ( host_uri ) );
- host_uri.host = http->uri->host;
- host_uri.port = http->uri->port;
- host_uri_string = format_uri_alloc ( &host_uri );
- if ( ! host_uri_string ) {
- rc = -ENOMEM;
- goto err_host_uri;
- }
-
- /* Construct path URI */
- memset ( &path_uri, 0, sizeof ( path_uri ) );
- path_uri.path = ( http->uri->path ? http->uri->path : "/" );
- path_uri.query = http->uri->query;
- path_uri_string = format_uri_alloc ( &path_uri );
- if ( ! path_uri_string ) {
- rc = -ENOMEM;
- goto err_path_uri;
- }
-
- /* Calculate range request parameters if applicable */
- if ( http->partial_len ) {
- len = asprintf ( &range, "Range: bytes=%zd-%zd\r\n",
- http->partial_start,
- ( http->partial_start + http->partial_len
- - 1 ) );
- if ( len < 0 ) {
- rc = len;
- goto err_range;
- }
- } else {
- range = NULL;
- }
-
- /* Construct authorisation, if applicable */
- if ( http->flags & HTTP_BASIC_AUTH ) {
- auth = http_basic_auth ( http );
- if ( ! auth ) {
- rc = -ENOMEM;
- goto err_auth;
- }
- } else if ( http->flags & HTTP_DIGEST_AUTH ) {
- auth = http_digest_auth ( http, method, path_uri_string );
- if ( ! auth ) {
- rc = -ENOMEM;
- goto err_auth;
- }
- } else {
- auth = NULL;
- }
-
- /* Construct POST content, if applicable */
- if ( http->uri->params ) {
- post = http_post ( http );
- if ( ! post ) {
- rc = -ENOMEM;
- goto err_post;
- }
- len = asprintf ( &content, "Content-Type: "
- "application/x-www-form-urlencoded\r\n"
- "Content-Length: %zd\r\n", iob_len ( post ) );
- if ( len < 0 ) {
- rc = len;
- goto err_content;
- }
- } else {
- post = NULL;
- content = NULL;
- }
-
- /* Mark request as transmitted */
- http->flags &= ~HTTP_TX_PENDING;
-
- /* Send request */
- if ( ( rc = xfer_printf ( &http->socket,
- "%s %s HTTP/1.1\r\n"
- "User-Agent: iPXE/%s\r\n"
- "Host: %s\r\n"
- "%s%s%s%s"
- "\r\n",
- method, path_uri_string, product_version,
- host_uri_string,
- ( ( http->flags & HTTP_CLIENT_KEEPALIVE ) ?
- "Connection: keep-alive\r\n" : "" ),
- ( range ? range : "" ),
- ( auth ? auth : "" ),
- ( content ? content : "" ) ) ) != 0 ) {
- goto err_xfer;
- }
-
- /* Send POST content, if applicable */
- if ( post ) {
- if ( ( rc = xfer_deliver_iob ( &http->socket,
- iob_disown ( post ) ) ) != 0 )
- goto err_xfer_post;
- }
-
- err_xfer_post:
- err_xfer:
- free ( content );
- err_content:
- free ( post );
- err_post:
- free ( auth );
- err_auth:
- free ( range );
- err_range:
- free ( path_uri_string );
- err_path_uri:
- free ( host_uri_string );
- err_host_uri:
- if ( rc != 0 )
- http_close ( http, rc );
- }
-
- /**
- * Check HTTP data transfer flow control window
- *
- * @v http HTTP request
- * @ret len Length of window
- */
- static size_t http_xfer_window ( struct http_request *http ) {
-
- /* New block commands may be issued only when we are idle */
- return ( ( http->rx_state == HTTP_RX_IDLE ) ? 1 : 0 );
- }
-
- /**
- * Initiate HTTP partial read
- *
- * @v http HTTP request
- * @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;
-
- /* Schedule request */
- http->rx_state = HTTP_RX_RESPONSE;
- http->flags = ( HTTP_TX_PENDING | HTTP_CLIENT_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_socket_close ),
- };
-
- /** HTTP socket interface descriptor */
- 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 ( 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 */
- static struct interface_descriptor http_xfer_desc =
- INTF_DESC_PASSTHRU ( struct http_request, xfer,
- http_xfer_operations, socket );
-
- /** HTTP process descriptor */
- static struct process_descriptor http_process_desc =
- PROC_DESC_ONCE ( struct http_request, process, http_step );
-
- /**
- * Initiate an HTTP connection, with optional filter
- *
- * @v xfer Data transfer interface
- * @v uri Uniform Resource Identifier
- * @v default_port Default port number
- * @v filter Filter to apply to socket, or NULL
- * @ret rc Return status code
- */
- int http_open_filter ( struct interface *xfer, struct uri *uri,
- unsigned int default_port,
- int ( * filter ) ( struct interface *xfer,
- const char *name,
- struct interface **next ) ) {
- struct http_request *http;
- int rc;
-
- /* Sanity checks */
- if ( ! uri->host )
- return -EINVAL;
-
- /* Allocate and populate HTTP structure */
- http = zalloc ( sizeof ( *http ) );
- if ( ! http )
- 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 );
- http->default_port = default_port;
- http->filter = filter;
- intf_init ( &http->socket, &http_socket_desc, &http->refcnt );
- process_init ( &http->process, &http_process_desc, &http->refcnt );
- timer_init ( &http->timer, http_retry, &http->refcnt );
- http->flags = HTTP_TX_PENDING;
-
- /* Open socket */
- if ( ( rc = http_socket_open ( http ) ) != 0 )
- goto err;
-
- /* Attach to parent interface, mortalise self, and return */
- intf_plug_plug ( &http->xfer, xfer );
- ref_put ( &http->refcnt );
- return 0;
-
- err:
- DBGC ( http, "HTTP %p could not create request: %s\n",
- http, strerror ( rc ) );
- http_close ( http, rc );
- ref_put ( &http->refcnt );
- return rc;
- }
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