307 lines
9.1 KiB
C
307 lines
9.1 KiB
C
/** @file
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*
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* PXE FILE API
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/uaccess.h>
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#include <ipxe/posix_io.h>
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#include <ipxe/features.h>
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#include <pxe.h>
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#include <realmode.h>
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/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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* Portions (C) 2010 Shao Miller <shao.miller@yrdsb.edu.on.ca>.
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* [PXE exit hook logic]
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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FEATURE ( FEATURE_MISC, "PXEXT", DHCP_EB_FEATURE_PXE_EXT, 2 );
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/**
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* FILE OPEN
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*
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* @v file_open Pointer to a struct s_PXENV_FILE_OPEN
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* @v s_PXENV_FILE_OPEN::FileName URL of file to open
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* @ret #PXENV_EXIT_SUCCESS File was opened
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* @ret #PXENV_EXIT_FAILURE File was not opened
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* @ret s_PXENV_FILE_OPEN::Status PXE status code
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* @ret s_PXENV_FILE_OPEN::FileHandle Handle of opened file
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*
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*/
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PXENV_EXIT_t pxenv_file_open ( struct s_PXENV_FILE_OPEN *file_open ) {
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userptr_t filename;
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size_t filename_len;
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int fd;
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DBG ( "PXENV_FILE_OPEN" );
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/* Copy name from external program, and open it */
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filename = real_to_user ( file_open->FileName.segment,
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file_open->FileName.offset );
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filename_len = strlen_user ( filename, 0 );
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{
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char uri_string[ filename_len + 1 ];
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copy_from_user ( uri_string, filename, 0,
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sizeof ( uri_string ) );
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DBG ( " %s", uri_string );
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fd = open ( uri_string );
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}
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if ( fd < 0 ) {
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file_open->Status = PXENV_STATUS ( fd );
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return PXENV_EXIT_FAILURE;
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}
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DBG ( " as file %d", fd );
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file_open->FileHandle = fd;
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file_open->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/**
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* FILE CLOSE
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*
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* @v file_close Pointer to a struct s_PXENV_FILE_CLOSE
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* @v s_PXENV_FILE_CLOSE::FileHandle File handle
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* @ret #PXENV_EXIT_SUCCESS File was closed
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* @ret #PXENV_EXIT_FAILURE File was not closed
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* @ret s_PXENV_FILE_CLOSE::Status PXE status code
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*
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*/
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PXENV_EXIT_t pxenv_file_close ( struct s_PXENV_FILE_CLOSE *file_close ) {
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DBG ( "PXENV_FILE_CLOSE %d", file_close->FileHandle );
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close ( file_close->FileHandle );
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file_close->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/**
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* FILE SELECT
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*
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* @v file_select Pointer to a struct s_PXENV_FILE_SELECT
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* @v s_PXENV_FILE_SELECT::FileHandle File handle
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* @ret #PXENV_EXIT_SUCCESS File has been checked for readiness
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* @ret #PXENV_EXIT_FAILURE File has not been checked for readiness
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* @ret s_PXENV_FILE_SELECT::Status PXE status code
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* @ret s_PXENV_FILE_SELECT::Ready Indication of readiness
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*
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*/
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PXENV_EXIT_t pxenv_file_select ( struct s_PXENV_FILE_SELECT *file_select ) {
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fd_set fdset;
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int ready;
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DBG ( "PXENV_FILE_SELECT %d", file_select->FileHandle );
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FD_ZERO ( &fdset );
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FD_SET ( file_select->FileHandle, &fdset );
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if ( ( ready = select ( &fdset, 0 ) ) < 0 ) {
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file_select->Status = PXENV_STATUS ( ready );
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return PXENV_EXIT_FAILURE;
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}
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file_select->Ready = ( ready ? RDY_READ : 0 );
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file_select->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/**
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* FILE READ
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*
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* @v file_read Pointer to a struct s_PXENV_FILE_READ
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* @v s_PXENV_FILE_READ::FileHandle File handle
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* @v s_PXENV_FILE_READ::BufferSize Size of data buffer
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* @v s_PXENV_FILE_READ::Buffer Data buffer
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* @ret #PXENV_EXIT_SUCCESS Data has been read from file
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* @ret #PXENV_EXIT_FAILURE Data has not been read from file
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* @ret s_PXENV_FILE_READ::Status PXE status code
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* @ret s_PXENV_FILE_READ::Ready Indication of readiness
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* @ret s_PXENV_FILE_READ::BufferSize Length of data read
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*
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*/
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PXENV_EXIT_t pxenv_file_read ( struct s_PXENV_FILE_READ *file_read ) {
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userptr_t buffer;
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ssize_t len;
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DBG ( "PXENV_FILE_READ %d to %04x:%04x+%04x", file_read->FileHandle,
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file_read->Buffer.segment, file_read->Buffer.offset,
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file_read->BufferSize );
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buffer = real_to_user ( file_read->Buffer.segment,
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file_read->Buffer.offset );
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if ( ( len = read_user ( file_read->FileHandle, buffer, 0,
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file_read->BufferSize ) ) < 0 ) {
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file_read->Status = PXENV_STATUS ( len );
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return PXENV_EXIT_FAILURE;
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}
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DBG ( " read %04zx", ( ( size_t ) len ) );
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file_read->BufferSize = len;
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file_read->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/**
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* GET FILE SIZE
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*
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* @v get_file_size Pointer to a struct s_PXENV_GET_FILE_SIZE
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* @v s_PXENV_GET_FILE_SIZE::FileHandle File handle
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* @ret #PXENV_EXIT_SUCCESS File size has been determined
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* @ret #PXENV_EXIT_FAILURE File size has not been determined
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* @ret s_PXENV_GET_FILE_SIZE::Status PXE status code
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* @ret s_PXENV_GET_FILE_SIZE::FileSize Size of file
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*/
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PXENV_EXIT_t pxenv_get_file_size ( struct s_PXENV_GET_FILE_SIZE
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*get_file_size ) {
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ssize_t filesize;
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DBG ( "PXENV_GET_FILE_SIZE %d", get_file_size->FileHandle );
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filesize = fsize ( get_file_size->FileHandle );
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if ( filesize < 0 ) {
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get_file_size->Status = PXENV_STATUS ( filesize );
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return PXENV_EXIT_FAILURE;
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}
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DBG ( " is %zd", ( ( size_t ) filesize ) );
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get_file_size->FileSize = filesize;
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get_file_size->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/**
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* FILE EXEC
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*
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* @v file_exec Pointer to a struct s_PXENV_FILE_EXEC
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* @v s_PXENV_FILE_EXEC::Command Command to execute
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* @ret #PXENV_EXIT_SUCCESS Command was executed successfully
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* @ret #PXENV_EXIT_FAILURE Command was not executed successfully
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* @ret s_PXENV_FILE_EXEC::Status PXE status code
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*
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*/
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PXENV_EXIT_t pxenv_file_exec ( struct s_PXENV_FILE_EXEC *file_exec ) {
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userptr_t command;
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size_t command_len;
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int rc;
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DBG ( "PXENV_FILE_EXEC" );
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/* Copy name from external program, and exec it */
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command = real_to_user ( file_exec->Command.segment,
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file_exec->Command.offset );
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command_len = strlen_user ( command, 0 );
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{
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char command_string[ command_len + 1 ];
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copy_from_user ( command_string, command, 0,
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sizeof ( command_string ) );
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DBG ( " %s", command_string );
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if ( ( rc = system ( command_string ) ) != 0 ) {
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file_exec->Status = PXENV_STATUS ( rc );
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return PXENV_EXIT_FAILURE;
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}
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}
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file_exec->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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segoff_t __data16 ( pxe_exit_hook ) = { 0, 0 };
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#define pxe_exit_hook __use_data16 ( pxe_exit_hook )
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/**
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* FILE API CHECK
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*
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* @v file_exec Pointer to a struct s_PXENV_FILE_API_CHECK
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* @v s_PXENV_FILE_API_CHECK::Magic Inbound magic number (0x91d447b2)
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* @ret #PXENV_EXIT_SUCCESS Command was executed successfully
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* @ret #PXENV_EXIT_FAILURE Command was not executed successfully
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* @ret s_PXENV_FILE_API_CHECK::Status PXE status code
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* @ret s_PXENV_FILE_API_CHECK::Magic Outbound magic number (0xe9c17b20)
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* @ret s_PXENV_FILE_API_CHECK::Provider "iPXE" (0x45585067)
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* @ret s_PXENV_FILE_API_CHECK::APIMask API function bitmask
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* @ret s_PXENV_FILE_API_CHECK::Flags Reserved
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*
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*/
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PXENV_EXIT_t pxenv_file_api_check ( struct s_PXENV_FILE_API_CHECK *file_api_check ) {
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DBG ( "PXENV_FILE_API_CHECK" );
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if ( file_api_check->Magic != 0x91d447b2 ) {
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file_api_check->Status = PXENV_STATUS_BAD_FUNC;
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return PXENV_EXIT_FAILURE;
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} else if ( file_api_check->Size <
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sizeof(struct s_PXENV_FILE_API_CHECK) ) {
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file_api_check->Status = PXENV_STATUS_OUT_OF_RESOURCES;
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return PXENV_EXIT_FAILURE;
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} else {
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file_api_check->Status = PXENV_STATUS_SUCCESS;
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file_api_check->Size = sizeof(struct s_PXENV_FILE_API_CHECK);
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file_api_check->Magic = 0xe9c17b20;
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file_api_check->Provider = 0x45585067; /* "iPXE" */
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file_api_check->APIMask = 0x0000007f; /* Functions e0-e6 */
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/* Check to see if we have a PXE exit hook */
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if ( pxe_exit_hook.segment | pxe_exit_hook.offset )
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/* Function e7, also */
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file_api_check->APIMask |= 0x00000080;
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file_api_check->Flags = 0; /* None defined */
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return PXENV_EXIT_SUCCESS;
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}
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}
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/**
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* FILE EXIT HOOK
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*
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* @v file_exit_hook Pointer to a struct
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* s_PXENV_FILE_EXIT_HOOK
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* @v s_PXENV_FILE_EXIT_HOOK::Hook SEG16:OFF16 to jump to
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* @ret #PXENV_EXIT_SUCCESS Successfully set hook
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* @ret #PXENV_EXIT_FAILURE We're not an NBP build
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* @ret s_PXENV_FILE_EXIT_HOOK::Status PXE status code
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*
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*/
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PXENV_EXIT_t pxenv_file_exit_hook ( struct s_PXENV_FILE_EXIT_HOOK
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*file_exit_hook ) {
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DBG ( "PXENV_FILE_EXIT_HOOK" );
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/* Check to see if we have a PXE exit hook */
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if ( pxe_exit_hook.segment | pxe_exit_hook.offset ) {
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/* We'll jump to the specified SEG16:OFF16 during exit */
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pxe_exit_hook.segment = file_exit_hook->Hook.segment;
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pxe_exit_hook.offset = file_exit_hook->Hook.offset;
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file_exit_hook->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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DBG ( " not NBP" );
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file_exit_hook->Status = PXENV_STATUS_UNSUPPORTED;
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return PXENV_EXIT_FAILURE;
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}
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