/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
* Copyright 2009-2012 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* linux.c
*
* Sample module to load Linux kernels. This module can also create
* a file out of the DHCP return data if running under PXELINUX.
*
* If -dhcpinfo is specified, the DHCP info is written into the file
* /dhcpinfo.dat in the initramfs.
*
* Usage: linux.c32 [-dhcpinfo] kernel arguments...
*/
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <console.h>
#include <syslinux/loadfile.h>
#include <syslinux/linux.h>
#include <syslinux/pxe.h>
enum ldmode {
ldmode_raw,
ldmode_cpio,
ldmodes
};
typedef int f_ldinitramfs(struct initramfs *, char *);
const char *progname = "linux.c32";
/* Find the last instance of a particular command line argument
(which should include the final =; do not use for boolean arguments) */
static char *find_argument(char **argv, const char *argument)
{
int la = strlen(argument);
char **arg;
char *ptr = NULL;
for (arg = argv; *arg; arg++) {
if (!strncmp(*arg, argument, la))
ptr = *arg + la;
}
return ptr;
}
/* Find the next instance of a particular command line argument */
static char **find_arguments(char **argv, char **ptr,
const char *argument)
{
int la = strlen(argument);
char **arg;
for (arg = argv; *arg; arg++) {
if (!strncmp(*arg, argument, la)) {
*ptr = *arg + la;
break;
}
}
/* Exhausted all arguments */
if (!*arg)
return NULL;
return arg;
}
/* Search for a boolean argument; return its position, or 0 if not present */
static int find_boolean(char **argv, const char *argument)
{
char **arg;
for (arg = argv; *arg; arg++) {
if (!strcmp(*arg, argument))
return (arg - argv) + 1;
}
return 0;
}
/* Stitch together the command line from a set of argv's */
static char *make_cmdline(char **argv)
{
char **arg;
size_t bytes;
char *cmdline, *p;
bytes = 1; /* Just in case we have a zero-entry cmdline */
for (arg = argv; *arg; arg++) {
bytes += strlen(*arg) + 1;
}
p = cmdline = malloc(bytes);
if (!cmdline)
return NULL;
for (arg = argv; *arg; arg++) {
int len = strlen(*arg);
memcpy(p, *arg, len);
p[len] = ' ';
p += len + 1;
}
if (p > cmdline)
p--; /* Remove the last space */
*p = '\0';
return cmdline;
}
static f_ldinitramfs ldinitramfs_raw;
static int ldinitramfs_raw(struct initramfs *initramfs, char *fname)
{
return initramfs_load_archive(initramfs, fname);
}
static f_ldinitramfs ldinitramfs_cpio;
static int ldinitramfs_cpio(struct initramfs *initramfs, char *fname)
{
char *target_fname, *p;
int do_mkdir, unmangle, rc;
/* Choose target_fname based on presence of "@" syntax */
target_fname = strchr(fname, '@');
if (target_fname) {
/* Temporarily mangle */
unmangle = 1;
*target_fname++ = '\0';
/* Make parent directories? */
do_mkdir = !!strchr(target_fname, '/');
} else {
unmangle = 0;
/* Forget the source path */
target_fname = fname;
while ((p = strchr(target_fname, '/')))
target_fname = p + 1;
/* The user didn't specify a desired path */
do_mkdir = 0;
}
/*
* Load the file, encapsulate it with the desired path, make the
* parent directories if the desired path contains them, add to initramfs
*/
rc = initramfs_load_file(initramfs, fname, target_fname, do_mkdir, 0755);
/* Unmangle, if needed*/
if (unmangle)
*--target_fname = '@';
return rc;
}
/* It only makes sense to call this function from main */
static int process_initramfs_args(char *arg, struct initramfs *initramfs,
const char *kernel_name, enum ldmode mode,
bool opt_quiet)
{
const char *mode_msg;
f_ldinitramfs *ldinitramfs;
char *p;
switch (mode) {
case ldmode_raw:
mode_msg = "Loading";
ldinitramfs = ldinitramfs_raw;
break;
case ldmode_cpio:
mode_msg = "Encapsulating";
ldinitramfs = ldinitramfs_cpio;
break;
case ldmodes:
default:
return 1;
}
do {
p = strchr(arg, ',');
if (p)
*p = '\0';
if (!opt_quiet)
printf("%s %s... ", mode_msg, arg);
errno = 0;
if (ldinitramfs(initramfs, arg)) {
if (opt_quiet)
printf("Loading %s ", kernel_name);
printf("failed: ");
return 1;
}
if (!opt_quiet)
printf("ok\n");
if (p)
*p++ = ',';
} while ((arg = p));
return 0;
}
static int setup_data_file(struct setup_data *setup_data,
uint32_t type, const char *filename,
bool opt_quiet)
{
if (!opt_quiet)
printf("Loading %s... ", filename);
if (setup_data_load(setup_data, type, filename)) {
if (opt_quiet)
printf("Loading %s ", filename);
printf("failed\n");
return -1;
}
if (!opt_quiet)
printf("ok\n");
return 0;
}
int main(int argc, char *argv[])
{
const char *kernel_name;
struct initramfs *initramfs;
struct setup_data *setup_data;
char *cmdline;
char *boot_image;
void *kernel_data;
size_t kernel_len;
bool opt_dhcpinfo = false;
bool opt_quiet = false;
void *dhcpdata;
size_t dhcplen;
char **argp, **argl, *arg;
(void)argc;
argp = argv + 1;
while ((arg = *argp) && arg[0] == '-') {
if (!strcmp("-dhcpinfo", arg)) {
opt_dhcpinfo = true;
} else {
fprintf(stderr, "%s: unknown option: %s\n", progname, arg);
return 1;
}
argp++;
}
if (!arg) {
fprintf(stderr, "%s: missing kernel name\n", progname);
return 1;
}
kernel_name = arg;
errno = 0;
boot_image = malloc(strlen(kernel_name) + 12);
if (!boot_image) {
fprintf(stderr, "Error allocating BOOT_IMAGE string: ");
goto bail;
}
strcpy(boot_image, "BOOT_IMAGE=");
strcpy(boot_image + 11, kernel_name);
/* argp now points to the kernel name, and the command line follows.
Overwrite the kernel name with the BOOT_IMAGE= argument, and thus
we have the final argument. */
*argp = boot_image;
if (find_boolean(argp, "quiet"))
opt_quiet = true;
if (!opt_quiet)
printf("Loading %s... ", kernel_name);
errno = 0;
if (loadfile(kernel_name, &kernel_data, &kernel_len)) {
if (opt_quiet)
printf("Loading %s ", kernel_name);
printf("failed: ");
goto bail;
}
if (!opt_quiet)
printf("ok\n");
errno = 0;
cmdline = make_cmdline(argp);
if (!cmdline) {
fprintf(stderr, "make_cmdline() failed: ");
goto bail;
}
/* Initialize the initramfs chain */
errno = 0;
initramfs = initramfs_init();
if (!initramfs) {
fprintf(stderr, "initramfs_init() failed: ");
goto bail;
}
/* Process initramfs arguments */
if ((arg = find_argument(argp, "initrd="))) {
if (process_initramfs_args(arg, initramfs, kernel_name, ldmode_raw,
opt_quiet))
goto bail;
}
argl = argv;
while ((argl = find_arguments(argl, &arg, "initrd+="))) {
argl++;
if (process_initramfs_args(arg, initramfs, kernel_name, ldmode_raw,
opt_quiet))
goto bail;
}
argl = argv;
while ((argl = find_arguments(argl, &arg, "initrdfile="))) {
argl++;
if (process_initramfs_args(arg, initramfs, kernel_name, ldmode_cpio,
opt_quiet))
goto bail;
}
/* Append the DHCP info */
if (opt_dhcpinfo &&
!pxe_get_cached_info(PXENV_PACKET_TYPE_DHCP_ACK, &dhcpdata, &dhcplen)) {
errno = 0;
if (initramfs_add_file(initramfs, dhcpdata, dhcplen, dhcplen,
"/dhcpinfo.dat", 0, 0755)) {
fprintf(stderr, "Unable to add DHCP info: ");
goto bail;
}
}
/* Handle dtb and eventually other setup data */
setup_data = setup_data_init();
if (!setup_data)
goto bail;
argl = argv;
while ((argl = find_arguments(argl, &arg, "dtb="))) {
argl++;
if (setup_data_file(setup_data, SETUP_DTB, arg, opt_quiet))
goto bail;
}
argl = argv;
while ((argl = find_arguments(argl, &arg, "blob."))) {
uint32_t type;
char *ep;
argl++;
type = strtoul(arg, &ep, 10);
if (ep[0] != '=' || !ep[1])
continue;
if (!type)
continue;
if (setup_data_file(setup_data, type, ep+1, opt_quiet))
goto bail;
}
/* This should not return... */
errno = 0;
syslinux_boot_linux(kernel_data, kernel_len, initramfs,
setup_data, cmdline);
fprintf(stderr, "syslinux_boot_linux() failed: ");
bail:
switch(errno) {
case ENOENT:
fprintf(stderr, "File not found\n");
break;
case ENOMEM:
fprintf(stderr, "Out of memory\n");
break;
default:
fprintf(stderr, "Error %d\n", errno);
break;
}
fprintf(stderr, "%s: Boot aborted!\n", progname);
return 1;
}