diff options
Diffstat (limited to 'qemu/roms/ipxe/src/net/tcp/httpcore.c')
| -rw-r--r-- | qemu/roms/ipxe/src/net/tcp/httpcore.c | 1930 |
1 files changed, 0 insertions, 1930 deletions
diff --git a/qemu/roms/ipxe/src/net/tcp/httpcore.c b/qemu/roms/ipxe/src/net/tcp/httpcore.c deleted file mode 100644 index af3ca9780..000000000 --- a/qemu/roms/ipxe/src/net/tcp/httpcore.c +++ /dev/null @@ -1,1930 +0,0 @@ -/* - * Copyright (C) 2015 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/process.h> -#include <ipxe/retry.h> -#include <ipxe/timer.h> -#include <ipxe/linebuf.h> -#include <ipxe/xferbuf.h> -#include <ipxe/blockdev.h> -#include <ipxe/acpi.h> -#include <ipxe/version.h> -#include <ipxe/params.h> -#include <ipxe/profile.h> -#include <ipxe/vsprintf.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 EINVAL_STATUS __einfo_error ( EINFO_EINVAL_STATUS ) -#define EINFO_EINVAL_STATUS \ - __einfo_uniqify ( EINFO_EINVAL, 0x01, "Invalid status line" ) -#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 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 EIO_4XX __einfo_error ( EINFO_EIO_4XX ) -#define EINFO_EIO_4XX \ - __einfo_uniqify ( EINFO_EIO, 0x04, "HTTP 4xx Client Error" ) -#define EIO_5XX __einfo_error ( EINFO_EIO_5XX ) -#define EINFO_EIO_5XX \ - __einfo_uniqify ( EINFO_EIO, 0x05, "HTTP 5xx Server Error" ) -#define ENOENT_404 __einfo_error ( EINFO_ENOENT_404 ) -#define EINFO_ENOENT_404 \ - __einfo_uniqify ( EINFO_ENOENT, 0x01, "HTTP 404 Not Found" ) -#define ENOTSUP_CONNECTION __einfo_error ( EINFO_ENOTSUP_CONNECTION ) -#define EINFO_ENOTSUP_CONNECTION \ - __einfo_uniqify ( EINFO_ENOTSUP, 0x01, "Unsupported connection header" ) -#define ENOTSUP_TRANSFER __einfo_error ( EINFO_ENOTSUP_TRANSFER ) -#define EINFO_ENOTSUP_TRANSFER \ - __einfo_uniqify ( EINFO_ENOTSUP, 0x02, "Unsupported transfer encoding" ) -#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" ) - -/** 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" }; - -static struct http_state http_request; -static struct http_state http_headers; -static struct http_state http_trailers; -static struct http_transfer_encoding http_transfer_identity; - -/****************************************************************************** - * - * Methods - * - ****************************************************************************** - */ - -/** HTTP HEAD method */ -struct http_method http_head = { - .name = "HEAD", -}; - -/** HTTP GET method */ -struct http_method http_get = { - .name = "GET", -}; - -/** HTTP POST method */ -struct http_method http_post = { - .name = "POST", -}; - -/****************************************************************************** - * - * Utility functions - * - ****************************************************************************** - */ - -/** - * Handle received HTTP line-buffered data - * - * @v http HTTP transaction - * @v iobuf I/O buffer - * @v linebuf Line buffer - * @ret rc Return status code - */ -static int http_rx_linebuf ( struct http_transaction *http, - struct io_buffer *iobuf, - struct line_buffer *linebuf ) { - int consumed; - int rc; - - /* Buffer received line */ - consumed = line_buffer ( linebuf, iobuf->data, iob_len ( iobuf ) ); - if ( consumed < 0 ) { - rc = consumed; - DBGC ( http, "HTTP %p could not buffer line: %s\n", - http, strerror ( rc ) ); - return rc; - } - - /* Consume line */ - iob_pull ( iobuf, consumed ); - - return 0; -} - -/** - * Get HTTP response token - * - * @v line Line position - * @v value Token value to fill in (if any) - * @ret token Token, or NULL - */ -char * http_token ( char **line, char **value ) { - char *token; - char quote = '\0'; - char c; - - /* Avoid returning uninitialised data */ - if ( value ) - *value = NULL; - - /* Skip any initial whitespace */ - while ( isspace ( **line ) ) - (*line)++; - - /* Check for end of line and record token position */ - if ( ! **line ) - return NULL; - token = *line; - - /* Scan for end of token */ - while ( ( c = **line ) ) { - - /* Terminate if we hit an unquoted whitespace */ - if ( isspace ( c ) && ! quote ) - break; - - /* Terminate if we hit a closing quote */ - if ( c == quote ) - break; - - /* Check for value separator */ - if ( value && ( ! *value ) && ( c == '=' ) ) { - - /* Terminate key portion of token */ - *((*line)++) = '\0'; - - /* Check for quote character */ - c = **line; - if ( ( c == '"' ) || ( c == '\'' ) ) { - quote = c; - (*line)++; - } - - /* Record value portion of token */ - *value = *line; - - } else { - - /* Move to next character */ - (*line)++; - } - } - - /* Terminate token, if applicable */ - if ( c ) - *((*line)++) = '\0'; - - return token; -} - -/****************************************************************************** - * - * Transactions - * - ****************************************************************************** - */ - -/** - * Free HTTP transaction - * - * @v refcnt Reference count - */ -static void http_free ( struct refcnt *refcnt ) { - struct http_transaction *http = - container_of ( refcnt, struct http_transaction, refcnt ); - - empty_line_buffer ( &http->response.headers ); - empty_line_buffer ( &http->linebuf ); - uri_put ( http->uri ); - free ( http ); -} - -/** - * Close HTTP transaction - * - * @v http HTTP transaction - * @v rc Reason for close - */ -static void http_close ( struct http_transaction *http, int rc ) { - - /* Stop process */ - process_del ( &http->process ); - - /* Stop timer */ - stop_timer ( &http->timer ); - - /* Close all interfaces, allowing for the fact that the - * content-decoded and transfer-decoded interfaces may be - * connected to the same object. - */ - intf_shutdown ( &http->conn, rc ); - intf_nullify ( &http->transfer ); - intf_shutdown ( &http->content, rc ); - intf_shutdown ( &http->transfer, rc ); - intf_shutdown ( &http->xfer, rc ); -} - -/** - * Close HTTP transaction with error (even if none specified) - * - * @v http HTTP transaction - * @v rc Reason for close - */ -static void http_close_error ( struct http_transaction *http, int rc ) { - - /* Treat any close as an error */ - http_close ( http, ( rc ? rc : -EPIPE ) ); -} - -/** - * Reopen stale HTTP connection - * - * @v http HTTP transaction - */ -static void http_reopen ( struct http_transaction *http ) { - int rc; - - /* Close existing connection */ - intf_restart ( &http->conn, -ECANCELED ); - - /* Reopen connection */ - if ( ( rc = http_connect ( &http->conn, http->uri ) ) != 0 ) { - DBGC ( http, "HTTP %p could not reconnect: %s\n", - http, strerror ( rc ) ); - goto err_connect; - } - - /* Reset state */ - http->state = &http_request; - - /* Reschedule transmission process */ - process_add ( &http->process ); - - return; - - err_connect: - http_close ( http, rc ); -} - -/** - * Handle retry timer expiry - * - * @v timer Retry timer - * @v over Failure indicator - */ -static void http_expired ( struct retry_timer *timer, int over __unused ) { - struct http_transaction *http = - container_of ( timer, struct http_transaction, timer ); - - /* Reopen connection */ - http_reopen ( http ); -} - -/** - * HTTP transmit process - * - * @v http HTTP transaction - */ -static void http_step ( struct http_transaction *http ) { - int rc; - - /* Do nothing if we have nothing to transmit */ - if ( ! http->state->tx ) - return; - - /* Do nothing until connection is ready */ - if ( ! xfer_window ( &http->conn ) ) - return; - - /* Do nothing until data transfer interface is ready */ - if ( ! xfer_window ( &http->xfer ) ) - return; - - /* Transmit data */ - if ( ( rc = http->state->tx ( http ) ) != 0 ) - goto err; - - return; - - err: - http_close ( http, rc ); -} - -/** - * Handle received HTTP data - * - * @v http HTTP transaction - * @v iobuf I/O buffer - * @v meta Transfer metadata - * @ret rc Return status code - * - * This function takes ownership of the I/O buffer. - */ -static int http_conn_deliver ( struct http_transaction *http, - struct io_buffer *iobuf, - struct xfer_metadata *meta __unused ) { - int rc; - - /* Handle received data */ - profile_start ( &http_rx_profiler ); - while ( iobuf && iob_len ( iobuf ) ) { - - /* Sanity check */ - if ( ( ! http->state ) || ( ! http->state->rx ) ) { - DBGC ( http, "HTTP %p unexpected data\n", http ); - rc = -EPROTO_UNSOLICITED; - goto err; - } - - /* Receive (some) data */ - if ( ( rc = http->state->rx ( http, &iobuf ) ) != 0 ) - goto err; - } - - /* Free I/O buffer, if applicable */ - free_iob ( iobuf ); - - profile_stop ( &http_rx_profiler ); - return 0; - - err: - free_iob ( iobuf ); - http_close ( http, rc ); - return rc; -} - -/** - * Handle server connection close - * - * @v http HTTP transaction - * @v rc Reason for close - */ -static void http_conn_close ( struct http_transaction *http, int rc ) { - - /* Sanity checks */ - assert ( http->state != NULL ); - assert ( http->state->close != NULL ); - - /* Restart server connection interface */ - intf_restart ( &http->conn, rc ); - - /* Hand off to state-specific method */ - http->state->close ( http, rc ); -} - -/** - * Handle received content-decoded data - * - * @v http HTTP transaction - * @v iobuf I/O buffer - * @v meta Data transfer metadata - */ -static int http_content_deliver ( struct http_transaction *http, - struct io_buffer *iobuf, - struct xfer_metadata *meta ) { - int rc; - - /* Ignore content if this is anything other than a successful - * transfer. - */ - if ( http->response.rc != 0 ) { - free_iob ( iobuf ); - return 0; - } - - /* Deliver to data transfer interface */ - profile_start ( &http_xfer_profiler ); - if ( ( rc = xfer_deliver ( &http->xfer, iob_disown ( iobuf ), - meta ) ) != 0 ) - return rc; - profile_stop ( &http_xfer_profiler ); - - return 0; -} - -/** - * Get underlying data transfer buffer - * - * @v http HTTP transaction - * @ret xferbuf Data transfer buffer, or NULL on error - */ -static struct xfer_buffer * -http_content_buffer ( struct http_transaction *http ) { - - /* Deny access to the data transfer buffer if this is anything - * other than a successful transfer. - */ - if ( http->response.rc != 0 ) - return NULL; - - /* Hand off to data transfer interface */ - return xfer_buffer ( &http->xfer ); -} - -/** - * Read from block device (when HTTP block device support is not present) - * - * @v http HTTP transaction - * @v data Data interface - * @v lba Starting logical block address - * @v count Number of logical blocks - * @v buffer Data buffer - * @v len Length of data buffer - * @ret rc Return status code - */ -__weak int http_block_read ( struct http_transaction *http __unused, - struct interface *data __unused, - uint64_t lba __unused, unsigned int count __unused, - userptr_t buffer __unused, size_t len __unused ) { - - return -ENOTSUP; -} - -/** - * Read block device capacity (when HTTP block device support is not present) - * - * @v control Control interface - * @v data Data interface - * @ret rc Return status code - */ -__weak int http_block_read_capacity ( struct http_transaction *http __unused, - struct interface *data __unused ) { - - return -ENOTSUP; -} - -/** - * Describe device in ACPI table (when HTTP block device support is not present) - * - * @v http HTTP transaction - * @v acpi ACPI table - * @v len Length of ACPI table - * @ret rc Return status code - */ -__weak int http_acpi_describe ( struct http_transaction *http __unused, - struct acpi_description_header *acpi __unused, - size_t len __unused ) { - - return -ENOTSUP; -} - -/** HTTP data transfer interface operations */ -static struct interface_operation http_xfer_operations[] = { - INTF_OP ( block_read, struct http_transaction *, http_block_read ), - INTF_OP ( block_read_capacity, struct http_transaction *, - http_block_read_capacity ), - INTF_OP ( acpi_describe, struct http_transaction *, - http_acpi_describe ), - INTF_OP ( xfer_window_changed, struct http_transaction *, http_step ), - INTF_OP ( intf_close, struct http_transaction *, http_close ), -}; - -/** HTTP data transfer interface descriptor */ -static struct interface_descriptor http_xfer_desc = - INTF_DESC_PASSTHRU ( struct http_transaction, xfer, - http_xfer_operations, content ); - -/** HTTP content-decoded interface operations */ -static struct interface_operation http_content_operations[] = { - INTF_OP ( xfer_deliver, struct http_transaction *, - http_content_deliver ), - INTF_OP ( xfer_buffer, struct http_transaction *, http_content_buffer ), - INTF_OP ( intf_close, struct http_transaction *, http_close ), -}; - -/** HTTP content-decoded interface descriptor */ -static struct interface_descriptor http_content_desc = - INTF_DESC_PASSTHRU ( struct http_transaction, content, - http_content_operations, xfer ); - -/** HTTP transfer-decoded interface operations */ -static struct interface_operation http_transfer_operations[] = { - INTF_OP ( intf_close, struct http_transaction *, http_close ), -}; - -/** HTTP transfer-decoded interface descriptor */ -static struct interface_descriptor http_transfer_desc = - INTF_DESC_PASSTHRU ( struct http_transaction, transfer, - http_transfer_operations, conn ); - -/** HTTP server connection interface operations */ -static struct interface_operation http_conn_operations[] = { - INTF_OP ( xfer_deliver, struct http_transaction *, http_conn_deliver ), - INTF_OP ( xfer_window_changed, struct http_transaction *, http_step ), - INTF_OP ( pool_reopen, struct http_transaction *, http_reopen ), - INTF_OP ( intf_close, struct http_transaction *, http_conn_close ), -}; - -/** HTTP server connection interface descriptor */ -static struct interface_descriptor http_conn_desc = - INTF_DESC_PASSTHRU ( struct http_transaction, conn, - http_conn_operations, transfer ); - -/** HTTP process descriptor */ -static struct process_descriptor http_process_desc = - PROC_DESC_ONCE ( struct http_transaction, process, http_step ); - -/** - * Open HTTP transaction - * - * @v xfer Data transfer interface - * @v method Request method - * @v uri Request URI - * @v range Content range (if any) - * @v content Request content (if any) - * @ret rc Return status code - */ -int http_open ( struct interface *xfer, struct http_method *method, - struct uri *uri, struct http_request_range *range, - struct http_request_content *content ) { - struct http_transaction *http; - struct uri request_uri; - struct uri request_host; - size_t request_uri_len; - size_t request_host_len; - size_t content_len; - char *request_uri_string; - char *request_host_string; - void *content_data; - int rc; - - /* Calculate request URI length */ - memset ( &request_uri, 0, sizeof ( request_uri ) ); - request_uri.path = ( uri->path ? uri->path : "/" ); - request_uri.query = uri->query; - request_uri_len = - ( format_uri ( &request_uri, NULL, 0 ) + 1 /* NUL */); - - /* Calculate host name length */ - memset ( &request_host, 0, sizeof ( request_host ) ); - request_host.host = uri->host; - request_host.port = uri->port; - request_host_len = - ( format_uri ( &request_host, NULL, 0 ) + 1 /* NUL */ ); - - /* Calculate request content length */ - content_len = ( content ? content->len : 0 ); - - /* Allocate and initialise structure */ - http = zalloc ( sizeof ( *http ) + request_uri_len + request_host_len + - content_len ); - if ( ! http ) { - rc = -ENOMEM; - goto err_alloc; - } - request_uri_string = ( ( ( void * ) http ) + sizeof ( *http ) ); - request_host_string = ( request_uri_string + request_uri_len ); - content_data = ( request_host_string + request_host_len ); - format_uri ( &request_uri, request_uri_string, request_uri_len ); - format_uri ( &request_host, request_host_string, request_host_len ); - ref_init ( &http->refcnt, http_free ); - intf_init ( &http->xfer, &http_xfer_desc, &http->refcnt ); - intf_init ( &http->content, &http_content_desc, &http->refcnt ); - intf_init ( &http->transfer, &http_transfer_desc, &http->refcnt ); - intf_init ( &http->conn, &http_conn_desc, &http->refcnt ); - intf_plug_plug ( &http->transfer, &http->content ); - process_init ( &http->process, &http_process_desc, &http->refcnt ); - timer_init ( &http->timer, http_expired, &http->refcnt ); - http->uri = uri_get ( uri ); - http->request.method = method; - http->request.uri = request_uri_string; - http->request.host = request_host_string; - if ( range ) { - memcpy ( &http->request.range, range, - sizeof ( http->request.range ) ); - } - if ( content ) { - http->request.content.type = content->type; - http->request.content.data = content_data; - http->request.content.len = content_len; - memcpy ( content_data, content->data, content_len ); - } - http->state = &http_request; - DBGC2 ( http, "HTTP %p %s://%s%s\n", http, http->uri->scheme, - http->request.host, http->request.uri ); - - /* Open connection */ - if ( ( rc = http_connect ( &http->conn, uri ) ) != 0 ) { - DBGC ( http, "HTTP %p could not connect: %s\n", - http, strerror ( rc ) ); - goto err_connect; - } - - /* Attach to parent interface, mortalise self, and return */ - intf_plug_plug ( &http->xfer, xfer ); - ref_put ( &http->refcnt ); - return 0; - - err_connect: - http_close ( http, rc ); - ref_put ( &http->refcnt ); - err_alloc: - return rc; -} - -/** - * Handle successful transfer completion - * - * @v http HTTP transaction - * @ret rc Return status code - */ -static int http_transfer_complete ( struct http_transaction *http ) { - struct http_authentication *auth; - const char *location; - int rc; - - /* Keep connection alive if applicable */ - if ( http->response.flags & HTTP_RESPONSE_KEEPALIVE ) - pool_recycle ( &http->conn ); - - /* Restart server connection interface */ - intf_restart ( &http->conn, 0 ); - - /* No more data is expected */ - http->state = NULL; - - /* If transaction is successful, then close the - * transfer-decoded interface. The content encoding may - * choose whether or not to immediately terminate the - * transaction. - */ - if ( http->response.rc == 0 ) { - intf_shutdown ( &http->transfer, 0 ); - return 0; - } - - /* Perform redirection, if applicable */ - if ( ( location = http->response.location ) ) { - DBGC2 ( http, "HTTP %p redirecting to \"%s\"\n", - http, location ); - if ( ( rc = xfer_redirect ( &http->xfer, LOCATION_URI_STRING, - location ) ) != 0 ) { - DBGC ( http, "HTTP %p could not redirect: %s\n", - http, strerror ( rc ) ); - return rc; - } - http_close ( http, 0 ); - return 0; - } - - /* Fail unless a retry is permitted */ - if ( ! ( http->response.flags & HTTP_RESPONSE_RETRY ) ) - return http->response.rc; - - /* Perform authentication, if applicable */ - if ( ( auth = http->response.auth.auth ) ) { - http->request.auth.auth = auth; - DBGC2 ( http, "HTTP %p performing %s authentication\n", - http, auth->name ); - if ( ( rc = auth->authenticate ( http ) ) != 0 ) { - DBGC ( http, "HTTP %p could not authenticate: %s\n", - http, strerror ( rc ) ); - return rc; - } - } - - /* Restart content decoding interfaces (which may be attached - * to the same object). - */ - intf_nullify ( &http->content ); - intf_nullify ( &http->transfer ); - intf_restart ( &http->content, http->response.rc ); - intf_restart ( &http->transfer, http->response.rc ); - http->content.desc = &http_content_desc; - http->transfer.desc = &http_transfer_desc; - intf_plug_plug ( &http->transfer, &http->content ); - http->len = 0; - assert ( http->remaining == 0 ); - - /* Start timer to initiate retry */ - DBGC2 ( http, "HTTP %p retrying after %d seconds\n", - http, http->response.retry_after ); - start_timer_fixed ( &http->timer, - ( http->response.retry_after * TICKS_PER_SEC ) ); - return 0; -} - -/****************************************************************************** - * - * Requests - * - ****************************************************************************** - */ - -/** - * Construct HTTP request headers - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length, or negative error - */ -static int http_format_headers ( struct http_transaction *http, char *buf, - size_t len ) { - struct http_request_header *header; - size_t used; - size_t remaining; - char *line; - int value_len; - int rc; - - /* Construct request line */ - used = ssnprintf ( buf, len, "%s %s HTTP/1.1", - http->request.method->name, http->request.uri ); - if ( used < len ) - DBGC2 ( http, "HTTP %p TX %s\n", http, buf ); - used += ssnprintf ( ( buf + used ), ( len - used ), "\r\n" ); - - /* Construct all headers */ - for_each_table_entry ( header, HTTP_REQUEST_HEADERS ) { - - /* Determine header value length */ - value_len = header->format ( http, NULL, 0 ); - if ( value_len < 0 ) { - rc = value_len; - return rc; - } - - /* Skip zero-length headers */ - if ( ! value_len ) - continue; - - /* Construct header */ - line = ( buf + used ); - used += ssnprintf ( ( buf + used ), ( len - used ), "%s: ", - header->name ); - remaining = ( ( used < len ) ? ( len - used ) : 0 ); - used += header->format ( http, ( buf + used ), remaining ); - if ( used < len ) - DBGC2 ( http, "HTTP %p TX %s\n", http, line ); - used += ssnprintf ( ( buf + used ), ( len - used ), "\r\n" ); - } - - /* Construct terminating newline */ - used += ssnprintf ( ( buf + used ), ( len - used ), "\r\n" ); - - return used; -} - -/** - * Construct HTTP "Host" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_host ( struct http_transaction *http, char *buf, - size_t len ) { - - /* Construct host URI */ - return snprintf ( buf, len, "%s", http->request.host ); -} - -/** HTTP "Host" header "*/ -struct http_request_header http_request_host __http_request_header = { - .name = "Host", - .format = http_format_host, -}; - -/** - * Construct HTTP "User-Agent" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_user_agent ( struct http_transaction *http __unused, - char *buf, size_t len ) { - - /* Construct user agent */ - return snprintf ( buf, len, "iPXE/%s", product_version ); -} - -/** HTTP "User-Agent" header */ -struct http_request_header http_request_user_agent __http_request_header = { - .name = "User-Agent", - .format = http_format_user_agent, -}; - -/** - * Construct HTTP "Connection" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_connection ( struct http_transaction *http __unused, - char *buf, size_t len ) { - - /* Always request keep-alive */ - return snprintf ( buf, len, "keep-alive" ); -} - -/** HTTP "Connection" header */ -struct http_request_header http_request_connection __http_request_header = { - .name = "Connection", - .format = http_format_connection, -}; - -/** - * Construct HTTP "Range" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_range ( struct http_transaction *http, - char *buf, size_t len ) { - - /* Construct range, if applicable */ - if ( http->request.range.len ) { - return snprintf ( buf, len, "bytes=%zd-%zd", - http->request.range.start, - ( http->request.range.start + - http->request.range.len - 1 ) ); - } else { - return 0; - } -} - -/** HTTP "Range" header */ -struct http_request_header http_request_range __http_request_header = { - .name = "Range", - .format = http_format_range, -}; - -/** - * Construct HTTP "Content-Type" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_content_type ( struct http_transaction *http, - char *buf, size_t len ) { - - /* Construct content type, if applicable */ - if ( http->request.content.type ) { - return snprintf ( buf, len, "%s", http->request.content.type ); - } else { - return 0; - } -} - -/** HTTP "Content-Type" header */ -struct http_request_header http_request_content_type __http_request_header = { - .name = "Content-Type", - .format = http_format_content_type, -}; - -/** - * Construct HTTP "Content-Length" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_content_length ( struct http_transaction *http, - char *buf, size_t len ) { - - /* Construct content length, if applicable */ - if ( http->request.content.len ) { - return snprintf ( buf, len, "%zd", http->request.content.len ); - } else { - return 0; - } -} - -/** HTTP "Content-Length" header */ -struct http_request_header http_request_content_length __http_request_header = { - .name = "Content-Length", - .format = http_format_content_length, -}; - -/** - * Construct HTTP "Accept-Encoding" header - * - * @v http HTTP transaction - * @v buf Buffer - * @v len Length of buffer - * @ret len Length of header value, or negative error - */ -static int http_format_accept_encoding ( struct http_transaction *http, - char *buf, size_t len ) { - struct http_content_encoding *encoding; - const char *sep = ""; - size_t used = 0; - - /* Construct list of content encodings */ - for_each_table_entry ( encoding, HTTP_CONTENT_ENCODINGS ) { - if ( encoding->supported && ( ! encoding->supported ( http ) ) ) - continue; - used += ssnprintf ( ( buf + used ), ( len - used ), - "%s%s", sep, encoding->name ); - sep = ", "; - } - - return used; -} - -/** HTTP "Accept-Encoding" header */ -struct http_request_header http_request_accept_encoding __http_request_header ={ - .name = "Accept-Encoding", - .format = http_format_accept_encoding, -}; - -/** - * Transmit request - * - * @v http HTTP transaction - * @ret rc Return status code - */ -static int http_tx_request ( struct http_transaction *http ) { - struct io_buffer *iobuf; - int len; - int check_len; - int rc; - - /* Calculate request length */ - len = http_format_headers ( http, NULL, 0 ); - if ( len < 0 ) { - rc = len; - DBGC ( http, "HTTP %p could not construct request: %s\n", - http, strerror ( rc ) ); - goto err_len; - } - - /* Allocate I/O buffer */ - iobuf = alloc_iob ( len + 1 /* NUL */ + http->request.content.len ); - if ( ! iobuf ) { - rc = -ENOMEM; - goto err_alloc; - } - - /* Construct request */ - check_len = http_format_headers ( http, iob_put ( iobuf, len ), - ( len + 1 /* NUL */ ) ); - assert ( check_len == len ); - memcpy ( iob_put ( iobuf, http->request.content.len ), - http->request.content.data, http->request.content.len ); - - /* Deliver request */ - if ( ( rc = xfer_deliver_iob ( &http->conn, - iob_disown ( iobuf ) ) ) != 0 ) { - DBGC ( http, "HTTP %p could not deliver request: %s\n", - http, strerror ( rc ) ); - goto err_deliver; - } - - /* Clear any previous response */ - empty_line_buffer ( &http->response.headers ); - memset ( &http->response, 0, sizeof ( http->response ) ); - - /* Move to response headers state */ - http->state = &http_headers; - - return 0; - - err_deliver: - free_iob ( iobuf ); - err_alloc: - err_len: - return rc; -} - -/** HTTP request state */ -static struct http_state http_request = { - .tx = http_tx_request, - .close = http_close_error, -}; - -/****************************************************************************** - * - * Response headers - * - ****************************************************************************** - */ - -/** - * Parse HTTP status line - * - * @v http HTTP transaction - * @v line Status line - * @ret rc Return status code - */ -static int http_parse_status ( struct http_transaction *http, char *line ) { - char *endp; - char *version; - char *vernum; - char *status; - int response_rc; - - DBGC2 ( http, "HTTP %p RX %s\n", http, line ); - - /* Parse HTTP version */ - version = http_token ( &line, NULL ); - if ( ( ! version ) || ( strncmp ( version, "HTTP/", 5 ) != 0 ) ) { - DBGC ( http, "HTTP %p malformed version \"%s\"\n", http, line ); - return -EINVAL_STATUS; - } - - /* Keepalive is enabled by default for anything newer than HTTP/1.0 */ - vernum = ( version + 5 /* "HTTP/" (presence already checked) */ ); - if ( vernum[0] == '0' ) { - /* HTTP/0.x : keepalive not enabled by default */ - } else if ( strncmp ( vernum, "1.0", 3 ) == 0 ) { - /* HTTP/1.0 : keepalive not enabled by default */ - } else { - /* HTTP/1.1 or newer: keepalive enabled by default */ - http->response.flags |= HTTP_RESPONSE_KEEPALIVE; - } - - /* Parse status code */ - status = line; - http->response.status = strtoul ( status, &endp, 10 ); - if ( *endp != ' ' ) { - DBGC ( http, "HTTP %p malformed status code \"%s\"\n", - http, status ); - return -EINVAL_STATUS; - } - - /* Convert HTTP status code to iPXE return status code */ - if ( status[0] == '2' ) { - /* 2xx Success */ - response_rc = 0; - } else if ( status[0] == '3' ) { - /* 3xx Redirection */ - response_rc = -EXDEV; - } else if ( http->response.status == 401 ) { - /* 401 Unauthorized */ - response_rc = -EACCES_401; - } else if ( http->response.status == 403 ) { - /* 403 Forbidden */ - response_rc = -EPERM_403; - } else if ( http->response.status == 404 ) { - /* 404 Not Found */ - response_rc = -ENOENT_404; - } else if ( status[0] == '4' ) { - /* 4xx Client Error (not already specified) */ - response_rc = -EIO_4XX; - } else if ( status[0] == '5' ) { - /* 5xx Server Error */ - response_rc = -EIO_5XX; - } else { - /* Unrecognised */ - response_rc = -EIO_OTHER; - } - http->response.rc = response_rc; - - return 0; -} - -/** - * Parse HTTP header - * - * @v http HTTP transaction - * @v line Header line - * @ret rc Return status code - */ -static int http_parse_header ( struct http_transaction *http, char *line ) { - struct http_response_header *header; - char *name = line; - char *sep; - - DBGC2 ( http, "HTTP %p RX %s\n", http, line ); - - /* Extract header name */ - sep = strstr ( line, ": " ); - if ( ! sep ) { - DBGC ( http, "HTTP %p malformed header \"%s\"\n", http, line ); - return -EINVAL_HEADER; - } - *sep = '\0'; - line = ( sep + 2 /* ": " */ ); - - /* Process header, if recognised */ - for_each_table_entry ( header, HTTP_RESPONSE_HEADERS ) { - if ( strcasecmp ( name, header->name ) == 0 ) - return header->parse ( http, line ); - } - - /* Unrecognised headers should be ignored */ - return 0; -} - -/** - * Parse HTTP response headers - * - * @v http HTTP transaction - * @ret rc Return status code - */ -static int http_parse_headers ( struct http_transaction *http ) { - char *line; - char *next; - int rc; - - /* Get status line */ - line = http->response.headers.data; - assert ( line != NULL ); - next = ( line + strlen ( line ) + 1 /* NUL */ ); - - /* Parse status line */ - if ( ( rc = http_parse_status ( http, line ) ) != 0 ) - return rc; - - /* Process header lines */ - while ( 1 ) { - - /* Move to next line */ - line = next; - next = ( line + strlen ( line ) + 1 /* NUL */ ); - - /* Stop on terminating blank line */ - if ( ! line[0] ) - return 0; - - /* Process header line */ - if ( ( rc = http_parse_header ( http, line ) ) != 0 ) - return rc; - } -} - -/** - * Parse HTTP "Location" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_location ( struct http_transaction *http, char *line ) { - - /* Store location */ - http->response.location = line; - return 0; -} - -/** HTTP "Location" header */ -struct http_response_header http_response_location __http_response_header = { - .name = "Location", - .parse = http_parse_location, -}; - -/** - * Parse HTTP "Transfer-Encoding" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_transfer_encoding ( struct http_transaction *http, - char *line ) { - struct http_transfer_encoding *encoding; - - /* Check for known transfer encodings */ - for_each_table_entry ( encoding, HTTP_TRANSFER_ENCODINGS ) { - if ( strcasecmp ( line, encoding->name ) == 0 ) { - http->response.transfer.encoding = encoding; - return 0; - } - } - - DBGC ( http, "HTTP %p unrecognised Transfer-Encoding \"%s\"\n", - http, line ); - return -ENOTSUP_TRANSFER; -} - -/** HTTP "Transfer-Encoding" header */ -struct http_response_header -http_response_transfer_encoding __http_response_header = { - .name = "Transfer-Encoding", - .parse = http_parse_transfer_encoding, -}; - -/** - * Parse HTTP "Connection" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_connection ( struct http_transaction *http, char *line ) { - - /* Check for known connection intentions */ - if ( strcasecmp ( line, "keep-alive" ) == 0 ) { - http->response.flags |= HTTP_RESPONSE_KEEPALIVE; - return 0; - } - if ( strcasecmp ( line, "close" ) == 0 ) { - http->response.flags &= ~HTTP_RESPONSE_KEEPALIVE; - return 0; - } - - DBGC ( http, "HTTP %p unrecognised Connection \"%s\"\n", http, line ); - return -ENOTSUP_CONNECTION; -} - -/** HTTP "Connection" header */ -struct http_response_header http_response_connection __http_response_header = { - .name = "Connection", - .parse = http_parse_connection, -}; - -/** - * Parse HTTP "Content-Length" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_content_length ( struct http_transaction *http, - char *line ) { - char *endp; - - /* Parse length */ - http->response.content.len = strtoul ( line, &endp, 10 ); - if ( *endp != '\0' ) { - DBGC ( http, "HTTP %p invalid Content-Length \"%s\"\n", - http, line ); - return -EINVAL_CONTENT_LENGTH; - } - - /* Record that we have a content length (since it may be zero) */ - http->response.flags |= HTTP_RESPONSE_CONTENT_LEN; - - return 0; -} - -/** HTTP "Content-Length" header */ -struct http_response_header -http_response_content_length __http_response_header = { - .name = "Content-Length", - .parse = http_parse_content_length, -}; - -/** - * Parse HTTP "Content-Encoding" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_content_encoding ( struct http_transaction *http, - char *line ) { - struct http_content_encoding *encoding; - - /* Check for known content encodings */ - for_each_table_entry ( encoding, HTTP_CONTENT_ENCODINGS ) { - if ( encoding->supported && ( ! encoding->supported ( http ) ) ) - continue; - if ( strcasecmp ( line, encoding->name ) == 0 ) { - http->response.content.encoding = encoding; - return 0; - } - } - - /* Some servers (e.g. Apache) have a habit of specifying - * unwarranted content encodings. For example, if Apache - * detects (via /etc/httpd/conf/magic) that a file's contents - * are gzip-compressed, it will set "Content-Encoding: x-gzip" - * regardless of the client's Accept-Encoding header. The - * only viable way to handle such servers is to treat unknown - * content encodings as equivalent to "identity". - */ - DBGC ( http, "HTTP %p unrecognised Content-Encoding \"%s\"\n", - http, line ); - return 0; -} - -/** HTTP "Content-Encoding" header */ -struct http_response_header -http_response_content_encoding __http_response_header = { - .name = "Content-Encoding", - .parse = http_parse_content_encoding, -}; - -/** - * Parse HTTP "Retry-After" header - * - * @v http HTTP transaction - * @v line Remaining header line - * @ret rc Return status code - */ -static int http_parse_retry_after ( struct http_transaction *http, - char *line ) { - char *endp; - - /* Try to parse value as a simple number of seconds */ - http->response.retry_after = strtoul ( line, &endp, 10 ); - if ( *endp != '\0' ) { - /* For any value which is not a simple number of - * seconds (e.g. a full HTTP date), just retry after a - * fixed delay, since we don't have code able to parse - * full HTTP dates. - */ - http->response.retry_after = HTTP_RETRY_SECONDS; - DBGC ( http, "HTTP %p cannot understand Retry-After \"%s\"; " - "using %d seconds\n", http, line, HTTP_RETRY_SECONDS ); - } - - /* Allow HTTP request to be retried after specified delay */ - http->response.flags |= HTTP_RESPONSE_RETRY; - - return 0; -} - -/** HTTP "Retry-After" header */ -struct http_response_header http_response_retry_after __http_response_header = { - .name = "Retry-After", - .parse = http_parse_retry_after, -}; - -/** - * Handle received HTTP headers - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_headers ( struct http_transaction *http, - struct io_buffer **iobuf ) { - struct http_transfer_encoding *transfer; - struct http_content_encoding *content; - char *line; - int rc; - - /* Buffer header line */ - if ( ( rc = http_rx_linebuf ( http, *iobuf, - &http->response.headers ) ) != 0 ) - return rc; - - /* Wait until we see the empty line marking end of headers */ - line = buffered_line ( &http->response.headers ); - if ( ( line == NULL ) || ( line[0] != '\0' ) ) - return 0; - - /* Process headers */ - if ( ( rc = http_parse_headers ( http ) ) != 0 ) - return rc; - - /* Initialise content encoding, if applicable */ - if ( ( content = http->response.content.encoding ) && - ( ( rc = content->init ( http ) ) != 0 ) ) { - DBGC ( http, "HTTP %p could not initialise %s content " - "encoding: %s\n", http, content->name, strerror ( rc ) ); - return rc; - } - - /* Presize receive buffer, if we have a content length */ - if ( http->response.content.len ) { - xfer_seek ( &http->transfer, http->response.content.len ); - xfer_seek ( &http->transfer, 0 ); - } - - /* Complete transfer if this is a HEAD request */ - if ( http->request.method == &http_head ) { - if ( ( rc = http_transfer_complete ( http ) ) != 0 ) - return rc; - return 0; - } - - /* Default to identity transfer encoding, if none specified */ - if ( ! http->response.transfer.encoding ) - http->response.transfer.encoding = &http_transfer_identity; - - /* Move to transfer encoding-specific data state */ - transfer = http->response.transfer.encoding; - http->state = &transfer->state; - - /* Initialise transfer encoding */ - if ( ( rc = transfer->init ( http ) ) != 0 ) { - DBGC ( http, "HTTP %p could not initialise %s transfer " - "encoding: %s\n", http, transfer->name, strerror ( rc )); - return rc; - } - - return 0; -} - -/** HTTP response headers state */ -static struct http_state http_headers = { - .rx = http_rx_headers, - .close = http_close_error, -}; - -/****************************************************************************** - * - * Identity transfer encoding - * - ****************************************************************************** - */ - -/** - * Initialise transfer encoding - * - * @v http HTTP transaction - * @ret rc Return status code - */ -static int http_init_transfer_identity ( struct http_transaction *http ) { - int rc; - - /* Complete transfer immediately if we have a zero content length */ - if ( ( http->response.flags & HTTP_RESPONSE_CONTENT_LEN ) && - ( http->response.content.len == 0 ) && - ( ( rc = http_transfer_complete ( http ) ) != 0 ) ) - return rc; - - return 0; -} - -/** - * Handle received data - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_transfer_identity ( struct http_transaction *http, - struct io_buffer **iobuf ) { - size_t len = iob_len ( *iobuf ); - int rc; - - /* Update lengths */ - http->len += len; - - /* Fail if this transfer would overrun the expected content - * length (if any). - */ - if ( ( http->response.flags & HTTP_RESPONSE_CONTENT_LEN ) && - ( http->len > http->response.content.len ) ) { - DBGC ( http, "HTTP %p content length overrun\n", http ); - return -EIO_CONTENT_LENGTH; - } - - /* Hand off to content encoding */ - if ( ( rc = xfer_deliver_iob ( &http->transfer, - iob_disown ( *iobuf ) ) ) != 0 ) - return rc; - - /* Complete transfer if we have received the expected content - * length (if any). - */ - if ( ( http->response.flags & HTTP_RESPONSE_CONTENT_LEN ) && - ( http->len == http->response.content.len ) && - ( ( rc = http_transfer_complete ( http ) ) != 0 ) ) - return rc; - - return 0; -} - -/** - * Handle server connection close - * - * @v http HTTP transaction - * @v rc Reason for close - */ -static void http_close_transfer_identity ( struct http_transaction *http, - int rc ) { - - /* Fail if any error occurred */ - if ( rc != 0 ) - goto err; - - /* Fail if we have a content length (since we would have - * already closed the connection if we had received the - * correct content length). - */ - if ( http->response.flags & HTTP_RESPONSE_CONTENT_LEN ) { - DBGC ( http, "HTTP %p content length underrun\n", http ); - rc = EIO_CONTENT_LENGTH; - goto err; - } - - /* Indicate that transfer is complete */ - if ( ( rc = http_transfer_complete ( http ) ) != 0 ) - goto err; - - return; - - err: - http_close ( http, rc ); -} - -/** Identity transfer encoding */ -static struct http_transfer_encoding http_transfer_identity = { - .name = "identity", - .init = http_init_transfer_identity, - .state = { - .rx = http_rx_transfer_identity, - .close = http_close_transfer_identity, - }, -}; - -/****************************************************************************** - * - * Chunked transfer encoding - * - ****************************************************************************** - */ - -/** - * Initialise transfer encoding - * - * @v http HTTP transaction - * @ret rc Return status code - */ -static int http_init_transfer_chunked ( struct http_transaction *http ) { - - /* Sanity checks */ - assert ( http->remaining == 0 ); - assert ( http->linebuf.len == 0 ); - - return 0; -} - -/** - * Handle received chunk length - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_chunk_len ( struct http_transaction *http, - struct io_buffer **iobuf ) { - char *line; - char *endp; - size_t len; - int rc; - - /* Receive into temporary line buffer */ - if ( ( rc = http_rx_linebuf ( http, *iobuf, &http->linebuf ) ) != 0 ) - return rc; - - /* Wait until we receive a non-empty line */ - line = buffered_line ( &http->linebuf ); - if ( ( line == NULL ) || ( line[0] == '\0' ) ) - return 0; - - /* Parse chunk length */ - http->remaining = strtoul ( line, &endp, 16 ); - if ( *endp != '\0' ) { - DBGC ( http, "HTTP %p invalid chunk length \"%s\"\n", - http, line ); - return -EINVAL_CHUNK_LENGTH; - } - - /* Empty line buffer */ - empty_line_buffer ( &http->linebuf ); - - /* Update expected length */ - len = ( http->len + http->remaining ); - xfer_seek ( &http->transfer, len ); - xfer_seek ( &http->transfer, http->len ); - - /* If chunk length is zero, then move to response trailers state */ - if ( ! http->remaining ) - http->state = &http_trailers; - - return 0; -} - -/** - * Handle received chunk data - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_chunk_data ( struct http_transaction *http, - struct io_buffer **iobuf ) { - struct io_buffer *payload; - uint8_t *crlf; - size_t len; - int rc; - - /* In the common case of a final chunk in a packet which also - * includes the terminating CRLF, strip the terminating CRLF - * (which we would ignore anyway) and hence avoid - * unnecessarily copying the data. - */ - if ( iob_len ( *iobuf ) == ( http->remaining + 2 /* CRLF */ ) ) { - crlf = ( (*iobuf)->data + http->remaining ); - if ( ( crlf[0] == '\r' ) && ( crlf[1] == '\n' ) ) - iob_unput ( (*iobuf), 2 /* CRLF */ ); - } - len = iob_len ( *iobuf ); - - /* Use whole/partial buffer as applicable */ - if ( len <= http->remaining ) { - - /* Whole buffer is to be consumed: decrease remaining - * length and use original I/O buffer as payload. - */ - payload = iob_disown ( *iobuf ); - http->len += len; - http->remaining -= len; - - } else { - - /* Partial buffer is to be consumed: copy data to a - * temporary I/O buffer. - */ - payload = alloc_iob ( http->remaining ); - if ( ! payload ) { - rc = -ENOMEM; - goto err; - } - memcpy ( iob_put ( payload, http->remaining ), (*iobuf)->data, - http->remaining ); - iob_pull ( *iobuf, http->remaining ); - http->len += http->remaining; - http->remaining = 0; - } - - /* Hand off to content encoding */ - if ( ( rc = xfer_deliver_iob ( &http->transfer, - iob_disown ( payload ) ) ) != 0 ) - goto err; - - return 0; - - err: - assert ( payload == NULL ); - return rc; -} - -/** - * Handle received chunked data - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_transfer_chunked ( struct http_transaction *http, - struct io_buffer **iobuf ) { - - /* Handle as chunk length or chunk data as appropriate */ - if ( http->remaining ) { - return http_rx_chunk_data ( http, iobuf ); - } else { - return http_rx_chunk_len ( http, iobuf ); - } -} - -/** Chunked transfer encoding */ -struct http_transfer_encoding http_transfer_chunked __http_transfer_encoding = { - .name = "chunked", - .init = http_init_transfer_chunked, - .state = { - .rx = http_rx_transfer_chunked, - .close = http_close_error, - }, -}; - -/****************************************************************************** - * - * Response trailers - * - ****************************************************************************** - */ - -/** - * Handle received HTTP trailer - * - * @v http HTTP transaction - * @v iobuf I/O buffer (may be claimed) - * @ret rc Return status code - */ -static int http_rx_trailers ( struct http_transaction *http, - struct io_buffer **iobuf ) { - char *line; - int rc; - - /* Buffer trailer line */ - if ( ( rc = http_rx_linebuf ( http, *iobuf, &http->linebuf ) ) != 0 ) - return rc; - - /* Wait until we see the empty line marking end of trailers */ - line = buffered_line ( &http->linebuf ); - if ( ( line == NULL ) || ( line[0] != '\0' ) ) - return 0; - - /* Empty line buffer */ - empty_line_buffer ( &http->linebuf ); - - /* Transfer is complete */ - if ( ( rc = http_transfer_complete ( http ) ) != 0 ) - return rc; - - return 0; -} - -/** HTTP response trailers state */ -static struct http_state http_trailers = { - .rx = http_rx_trailers, - .close = http_close_error, -}; - -/****************************************************************************** - * - * Simple URI openers - * - ****************************************************************************** - */ - -/** - * Construct HTTP parameter list - * - * @v params Parameter list - * @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_params ( struct parameters *params, 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, 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; -} - -/** - * Open HTTP transaction for simple GET URI - * - * @v xfer Data transfer interface - * @v uri Request URI - * @ret rc Return status code - */ -static int http_open_get_uri ( struct interface *xfer, struct uri *uri ) { - - return http_open ( xfer, &http_get, uri, NULL, NULL ); -} - -/** - * Open HTTP transaction for simple POST URI - * - * @v xfer Data transfer interface - * @v uri Request URI - * @ret rc Return status code - */ -static int http_open_post_uri ( struct interface *xfer, struct uri *uri ) { - struct parameters *params = uri->params; - struct http_request_content content; - void *data; - size_t len; - size_t check_len; - int rc; - - /* Calculate length of parameter list */ - len = http_params ( params, NULL, 0 ); - - /* Allocate temporary parameter list */ - data = zalloc ( len + 1 /* NUL */ ); - if ( ! data ) { - rc = -ENOMEM; - goto err_alloc; - } - - /* Construct temporary parameter list */ - check_len = http_params ( params, data, ( len + 1 /* NUL */ ) ); - assert ( check_len == len ); - - /* Construct request content */ - content.type = "application/x-www-form-urlencoded"; - content.data = data; - content.len = len; - - /* Open HTTP transaction */ - if ( ( rc = http_open ( xfer, &http_post, uri, NULL, &content ) ) != 0 ) - goto err_open; - - err_open: - free ( data ); - err_alloc: - return rc; -} - -/** - * Open HTTP transaction for simple URI - * - * @v xfer Data transfer interface - * @v uri Request URI - * @ret rc Return status code - */ -int http_open_uri ( struct interface *xfer, struct uri *uri ) { - - /* Open GET/POST URI as applicable */ - if ( uri->params ) { - return http_open_post_uri ( xfer, uri ); - } else { - return http_open_get_uri ( xfer, uri ); - } -} - -/* Drag in HTTP extensions */ -REQUIRING_SYMBOL ( http_open ); -REQUIRE_OBJECT ( config_http ); |