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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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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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* 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ipxe/command.h>
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#include <ipxe/parseopt.h>
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#include <ipxe/image.h>
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#include <ipxe/shell.h>
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#include <usr/prompt.h>
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#include <ipxe/script.h>
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/** Offset within current script
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* This is a global in order to allow goto_exec() to update the
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static size_t script_offset;
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* Process script lines
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* @v process_line Line processor
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* @v terminate Termination check
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* @ret rc Return status code
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static int process_script ( struct image *image,
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int ( * process_line ) ( struct image *image,
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const char *command ),
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int ( * terminate ) ( int rc ) ) {
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/* Initialise script and line offsets */
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/* Find length of next line, excluding any terminating '\n' */
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eol = memchr_user ( image->data, script_offset, '\n',
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( image->len - script_offset ) );
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frag_len = ( eol - script_offset );
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/* Allocate buffer for line */
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tmp = realloc ( line, ( len + frag_len + 1 /* NUL */ ) );
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copy_from_user ( ( line + len ), image->data, script_offset,
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/* Move to next line in script */
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script_offset += ( frag_len + 1 );
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/* Strip trailing CR, if present */
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if ( len && ( line[ len - 1 ] == '\r' ) )
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/* Handle backslash continuations */
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if ( len && ( line[ len - 1 ] == '\\' ) ) {
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/* Split line into (optional) label and command */
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while ( isspace ( *command ) )
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if ( *command == ':' ) {
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while ( *command && ! isspace ( *command ) )
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rc = process_line ( image, line_offset, label, command );
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if ( terminate ( rc ) )
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/* Update line offset */
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line_offset = script_offset;
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} while ( script_offset < image->len );
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* Terminate script processing on shell exit or command failure
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* @v rc Line processing status
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* @ret terminate Terminate script processing
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static int terminate_on_exit_or_failure ( int rc ) {
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return ( shell_stopped ( SHELL_STOP_COMMAND_SEQUENCE ) ||
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* Execute script line
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* @v offset Offset within script
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* @v label Label, or NULL
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* @ret rc Return status code
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static int script_exec_line ( struct image *image, size_t offset,
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const char *label __unused,
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const char *command ) {
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DBGC ( image, "[%04zx] $ %s\n", offset, command );
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/* Execute command */
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if ( ( rc = system ( command ) ) != 0 )
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* @ret rc Return status code
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static int script_exec ( struct image *image ) {
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/* Temporarily de-register image, so that a "boot" command
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* doesn't throw us into an execution loop.
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unregister_image ( image );
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/* Preserve state of any currently-running script */
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saved_offset = script_offset;
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rc = process_script ( image, script_exec_line,
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terminate_on_exit_or_failure );
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/* Restore saved state */
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script_offset = saved_offset;
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/* Re-register image (unless we have been replaced) */
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if ( ! image->replacement )
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register_image ( image );
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* @ret rc Return status code
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static int script_probe ( struct image *image ) {
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static const char ipxe_magic[] = "#!ipxe";
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static const char gpxe_magic[] = "#!gpxe";
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linker_assert ( sizeof ( ipxe_magic ) == sizeof ( gpxe_magic ),
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magic_size_mismatch );
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char test[ sizeof ( ipxe_magic ) - 1 /* NUL */
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+ 1 /* terminating space */];
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if ( image->len < sizeof ( test ) ) {
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DBGC ( image, "Too short to be a script\n" );
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/* Check for magic signature */
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copy_from_user ( test, image->data, 0, sizeof ( test ) );
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if ( ! ( ( ( memcmp ( test, ipxe_magic, sizeof ( test ) - 1 ) == 0 ) ||
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( memcmp ( test, gpxe_magic, sizeof ( test ) - 1 ) == 0 )) &&
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isspace ( test[ sizeof ( test ) - 1 ] ) ) ) {
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DBGC ( image, "Invalid magic signature\n" );
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/** Script image type */
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struct image_type script_image_type __image_type ( PROBE_NORMAL ) = {
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.probe = script_probe,
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/** "goto" options */
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struct goto_options {};
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/** "goto" option list */
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static struct option_descriptor goto_opts[] = {};
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/** "goto" command descriptor */
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static struct command_descriptor goto_cmd =
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COMMAND_DESC ( struct goto_options, goto_opts, 1, 1, "<label>" );
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* Current "goto" label
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* Valid only during goto_exec(). Consider this part of a closure.
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static const char *goto_label;
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* Check for presence of label
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* @v offset Offset within script
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* @ret rc Return status code
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static int goto_find_label ( struct image *image, size_t offset,
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const char *label, const char *command __unused ) {
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/* Check label exists */
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/* Check label matches */
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if ( strcmp ( goto_label, label ) != 0 )
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/* Update script offset */
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script_offset = offset;
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DBGC ( image, "[%04zx] Gone to :%s\n", offset, label );
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* Terminate script processing when label is found
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* @v rc Line processing status
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* @ret terminate Terminate script processing
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static int terminate_on_label_found ( int rc ) {
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* @v argc Argument count
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* @v argv Argument list
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* @ret rc Return status code
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static int goto_exec ( int argc, char **argv ) {
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struct goto_options opts;
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if ( ( rc = parse_options ( argc, argv, &goto_cmd, &opts ) ) != 0 )
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if ( ! current_image ) {
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printf ( "Not in a script: %s\n", strerror ( rc ) );
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goto_label = argv[optind];
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saved_offset = script_offset;
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if ( ( rc = process_script ( current_image, goto_find_label,
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terminate_on_label_found ) ) != 0 ) {
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script_offset = saved_offset;
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DBGC ( current_image, "[%04zx] No such label :%s\n",
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script_offset, goto_label );
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/* Terminate processing of current command */
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shell_stop ( SHELL_STOP_COMMAND );
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/** "goto" command */
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struct command goto_command __command = {
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/** "prompt" options */
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struct prompt_options {
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/** Key to wait for */
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unsigned long timeout;
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/** "prompt" option list */
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static struct option_descriptor prompt_opts[] = {
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OPTION_DESC ( "key", 'k', required_argument,
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struct prompt_options, key, parse_key ),
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OPTION_DESC ( "timeout", 't', required_argument,
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struct prompt_options, timeout, parse_timeout ),
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/** "prompt" command descriptor */
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static struct command_descriptor prompt_cmd =
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COMMAND_DESC ( struct prompt_options, prompt_opts, 0, MAX_ARGUMENTS,
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* @v argc Argument count
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* @v argv Argument list
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* @ret rc Return status code
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static int prompt_exec ( int argc, char **argv ) {
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struct prompt_options opts;
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if ( ( rc = parse_options ( argc, argv, &prompt_cmd, &opts ) ) != 0 )
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/* Parse prompt text */
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text = concat_args ( &argv[optind] );
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/* Display prompt and wait for key */
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if ( ( rc = prompt ( text, opts.timeout, opts.key ) ) != 0 )
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/* Free prompt text */
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/** "prompt" command */
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struct command prompt_command __command = {