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rufus/src/syslinux.c

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/* ----------------------------------------------------------------------- *
*
* Copyright 2003 Lars Munch Christensen - All Rights Reserved
* Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
* Copyright 2012-2016 Pete Batard
*
* Based on the Linux installer program for SYSLINUX by H. Peter Anvin
*
* 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, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/* Memory leaks detection - define _CRTDBG_MAP_ALLOC as preprocessor macro */
#ifdef _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif
#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <malloc.h>
#include <ctype.h>
#include "rufus.h"
#include "missing.h"
#include "resource.h"
#include "msapi_utf8.h"
#include "localization.h"
#include "drive.h"
#include "syslinux.h"
#include "syslxfs.h"
#include "libfat.h"
#include "setadv.h"
#include "ntfssect.h"
unsigned char* syslinux_ldlinux[2] = { NULL, NULL };
unsigned long syslinux_ldlinux_len[2];
unsigned char* syslinux_mboot = NULL;
unsigned long syslinux_mboot_len;
/* Workaround for 4K support */
uint32_t SECTOR_SHIFT = 9;
uint32_t SECTOR_SIZE = 512;
uint32_t LIBFAT_SECTOR_SHIFT = 9;
uint32_t LIBFAT_SECTOR_SIZE = 512;
uint32_t LIBFAT_SECTOR_MASK = 511;
/*
* Wrapper for ReadFile suitable for libfat
*/
int libfat_readfile(intptr_t pp, void *buf, size_t secsize, libfat_sector_t sector)
{
LARGE_INTEGER offset;
DWORD bytes_read;
offset.QuadPart = (LONGLONG) sector * secsize;
if (!SetFilePointerEx((HANDLE) pp, offset, NULL, FILE_BEGIN)) {
uprintf("Could not set pointer to position %llu: %s", offset.QuadPart, WindowsErrorString());
return 0;
}
if (!ReadFile((HANDLE) pp, buf, (DWORD) secsize, &bytes_read, NULL)) {
uprintf("Could not read sector %llu: %s", sector, WindowsErrorString());
return 0;
}
if (bytes_read != secsize) {
uprintf("Sector %llu: Read %d bytes instead of %d requested", sector, bytes_read, secsize);
return 0;
}
return (int)secsize;
}
/*
* Extract the ldlinux.sys and ldlinux.bss from resources,
* then patch and install them
*/
BOOL InstallSyslinux(DWORD drive_index, char drive_letter, int fs_type)
{
const LARGE_INTEGER liZero = { {0, 0} };
HANDLE f_handle = INVALID_HANDLE_VALUE;
HANDLE d_handle = INVALID_HANDLE_VALUE;
DWORD bytes_read, bytes_written, err;
S_NTFSSECT_VOLINFO vol_info;
LARGE_INTEGER vcn, lba, len;
S_NTFSSECT_EXTENT extent;
BOOL r = FALSE;
FILE* fd;
size_t length;
static unsigned char* sectbuf = NULL;
static char* resource[2][2] = {
{ MAKEINTRESOURCEA(IDR_SL_LDLINUX_V4_SYS), MAKEINTRESOURCEA(IDR_SL_LDLINUX_V4_BSS) },
{ MAKEINTRESOURCEA(IDR_SL_LDLINUX_V6_SYS), MAKEINTRESOURCEA(IDR_SL_LDLINUX_V6_BSS) } };
const char* ldlinux = "ldlinux";
const char* syslinux = "syslinux";
const char* ldlinux_ext[3] = { "sys", "bss", "c32" };
const char* mboot_c32 = "mboot.c32";
char path[MAX_PATH], tmp[64];
const char *errmsg;
struct libfat_filesystem *fs;
libfat_sector_t s, *secp;
libfat_sector_t *sectors = NULL;
int ldlinux_sectors;
uint32_t ldlinux_cluster;
int i, nsectors, sl_fs_stype;
int bt = (int)ComboBox_GetItemData(hBootType, ComboBox_GetCurSel(hBootType));
BOOL use_v5 = (bt == BT_SYSLINUX_V6) || ((bt == BT_ISO) && (SL_MAJOR(img_report.sl_version) >= 5));
PrintInfoDebug(0, MSG_234, (bt == BT_ISO)?img_report.sl_version_str:embedded_sl_version_str[use_v5?1:0]);
/* 4K sector size workaround */
SECTOR_SHIFT = 0;
SECTOR_SIZE = SelectedDrive.SectorSize;
while (SECTOR_SIZE>>=1)
SECTOR_SHIFT++;
SECTOR_SIZE = SelectedDrive.SectorSize;
LIBFAT_SECTOR_SHIFT = SECTOR_SHIFT;
LIBFAT_SECTOR_SIZE = SECTOR_SIZE;
LIBFAT_SECTOR_MASK = SECTOR_SIZE - 1;
/* sectbuf should be aligned to at least 8 bytes - see github #767 */
sectbuf = _mm_malloc(SECTOR_SIZE, 16);
if (sectbuf == NULL)
goto out;
/* First, reopen the volume (we already have a lock) */
d_handle = GetLogicalHandle(drive_index, TRUE, FALSE);
if ((d_handle == INVALID_HANDLE_VALUE) || (d_handle == NULL)) {
uprintf("Could open volume for Syslinux installation");
goto out;
}
/* Make sure we can read the boot sector (NB: Re-open already set us to offset 0) */
if (!ReadFile(d_handle, sectbuf, SECTOR_SIZE, &bytes_read, NULL)) {
uprintf("Could not read VBR");
goto out;
}
if (bytes_read != SECTOR_SIZE) {
uprintf("Could not read the whole VBR");
goto out;
}
if ((errmsg = syslinux_check_bootsect(sectbuf, &sl_fs_stype))) {
uprintf("Error: %s", errmsg);
goto out;
}
/* Initialize the ADV -- this should be smarter */
syslinux_reset_adv(syslinux_adv);
/* Access a copy of the ldlinux.sys & ldlinux.bss resources (downloaded or embedded) */
if ((syslinux_ldlinux_len[0] != 0) && (syslinux_ldlinux_len[1] != 0)) {
IGNORE_RETVAL(_chdirU(app_dir));
for (i=0; i<2; i++) {
syslinux_ldlinux[i] = (unsigned char*) malloc(syslinux_ldlinux_len[i]);
if (syslinux_ldlinux[i] == NULL)
goto out;
static_sprintf(path, "%s/%s-%s%s/%s.%s", FILES_DIR, syslinux, img_report.sl_version_str,
img_report.sl_version_ext, ldlinux, i==0?"sys":"bss");
fd = fopen(path, "rb");
if (fd == NULL) {
uprintf("Could not open %s", path);
goto out;
}
length = fread(syslinux_ldlinux[i], 1, (size_t)syslinux_ldlinux_len[i], fd);
fclose(fd);
if (length != (size_t)syslinux_ldlinux_len[i]) {
uprintf("Could not read %s", path);
goto out;
}
uprintf("Using existing './%s' %s", path,
IsBufferInDB(syslinux_ldlinux[i], (size_t)syslinux_ldlinux_len[i])?"✓":"✗");
}
} else {
for (i=0; i<2; i++) {
static_sprintf(tmp, "%s.%s", ldlinux, ldlinux_ext[i]);
syslinux_ldlinux[i] = GetResource(hMainInstance, resource[use_v5?1:0][i],
_RT_RCDATA, tmp, &syslinux_ldlinux_len[i], TRUE);
if (syslinux_ldlinux[i] == NULL)
goto out;
}
}
/* Create ldlinux.sys file */
static_sprintf(path, "%C:\\%s.%s", drive_letter, ldlinux, ldlinux_ext[0]);
f_handle = CreateFileA(path, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM |
FILE_ATTRIBUTE_HIDDEN, NULL);
if (f_handle == INVALID_HANDLE_VALUE) {
uprintf("Unable to create '%s'", &path[3]);
goto out;
}
/* Write ldlinux.sys file */
if (!WriteFileWithRetry(f_handle, (const char _force *)syslinux_ldlinux[0],
syslinux_ldlinux_len[0], &bytes_written, WRITE_RETRIES)) {
uprintf("Could not write '%s': %s", &path[3], WindowsErrorString());
goto out;
}
if (!WriteFileWithRetry(f_handle, syslinux_adv, 2 * ADV_SIZE,
&bytes_written, WRITE_RETRIES)) {
uprintf("Could not write ADV to '%s': %s", &path[3], WindowsErrorString());
goto out;
}
uprintf("Successfully wrote '%s'", &path[3]);
if (bt != BT_ISO)
UpdateProgress(OP_DOS, -1.0f);
/* Now flush the media */
if (!FlushFileBuffers(f_handle)) {
uprintf("FlushFileBuffers failed");
goto out;
}
/* Map the file (is there a better way to do this?) */
ldlinux_sectors = (syslinux_ldlinux_len[0] + 2 * ADV_SIZE + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
sectors = (libfat_sector_t*) calloc(ldlinux_sectors, sizeof *sectors);
if (sectors == NULL)
goto out;
switch (fs_type) {
case FS_NTFS:
static_sprintf(tmp, "%C:\\", drive_letter);
vol_info.Handle = d_handle;
err = NtfsSectGetVolumeInfo(tmp, &vol_info);
if (err != ERROR_SUCCESS) {
uprintf("Could not fetch NTFS volume info");
goto out;
}
secp = sectors;
nsectors = 0;
for (vcn.QuadPart = 0;
NtfsSectGetFileVcnExtent(f_handle, &vcn, &extent) == ERROR_SUCCESS;
vcn = extent.NextVcn) {
err = NtfsSectLcnToLba(&vol_info, &extent.FirstLcn, &lba);
if (err != ERROR_SUCCESS) {
uprintf("Could not translate LDLINUX.SYS LCN to disk LBA");
goto out;
}
lba.QuadPart -= vol_info.PartitionLba.QuadPart;
len.QuadPart = ((extent.NextVcn.QuadPart -
extent.FirstVcn.QuadPart) *
vol_info.SectorsPerCluster);
while (len.QuadPart-- && nsectors < ldlinux_sectors) {
*secp++ = lba.QuadPart++;
nsectors++;
}
}
break;
case FS_FAT16:
case FS_FAT32:
case FS_EXFAT:
fs = libfat_open(libfat_readfile, (intptr_t) d_handle);
if (fs == NULL) {
uprintf("Syslinux FAT access error");
goto out;
}
ldlinux_cluster = libfat_searchdir(fs, 0, "LDLINUX SYS", NULL);
secp = sectors;
nsectors = 0;
s = libfat_clustertosector(fs, ldlinux_cluster);
while (s && nsectors < ldlinux_sectors) {
*secp++ = s;
nsectors++;
s = libfat_nextsector(fs, s);
}
libfat_close(fs);
break;
default:
uprintf("Unsupported Syslinux filesystem");
goto out;
}
/* Patch ldlinux.sys and the boot sector */
if (syslinux_patch(sectors, nsectors, 0, 0, NULL, NULL) < 0) {
uprintf("Could not patch Syslinux files.");
uprintf("WARNING: This could be caused by your firewall having modifed downloaded content, such as 'ldlinux.sys'...");
goto out;
}
/* Rewrite the file */
if (!SetFilePointerEx(f_handle, liZero, NULL, FILE_BEGIN) ||
!WriteFileWithRetry(f_handle, syslinux_ldlinux[0], syslinux_ldlinux_len[0],
&bytes_written, WRITE_RETRIES)) {
uprintf("Could not rewrite '%s': %s\n", &path[3], WindowsErrorString());
goto out;
}
/* Close file */
safe_closehandle(f_handle);
/* Read existing FAT data into boot sector */
if (!SetFilePointerEx(d_handle, liZero, NULL, FILE_BEGIN) ||
!ReadFile(d_handle, sectbuf, SECTOR_SIZE,
&bytes_read, NULL)) {
uprintf("Could not read Syslinux boot record: %s", WindowsErrorString());
goto out;
}
if (bytes_read < SECTOR_SIZE) {
uprintf("Partial read of Syslinux boot record: read %d bytes but requested %d", bytes_read, SECTOR_SIZE);
goto out;
}
/* Make the syslinux boot sector */
syslinux_make_bootsect(sectbuf, (fs_type == FS_NTFS)?NTFS:VFAT);
/* Write boot sector back */
if (!SetFilePointerEx(d_handle, liZero, NULL, FILE_BEGIN) ||
!WriteFileWithRetry(d_handle, sectbuf, SECTOR_SIZE,
&bytes_written, WRITE_RETRIES)) {
uprintf("Could not write Syslinux boot record: %s", WindowsErrorString());
goto out;
}
uprintf("Successfully wrote Syslinux boot record");
if (bt == BT_SYSLINUX_V6) {
IGNORE_RETVAL(_chdirU(app_dir));
static_sprintf(path, "%s/%s-%s", FILES_DIR, syslinux, embedded_sl_version_str[1]);
IGNORE_RETVAL(_chdir(path));
static_sprintf(path, "%C:\\%s.%s", drive_letter, ldlinux, ldlinux_ext[2]);
fd = fopen(&path[3], "rb");
if (fd == NULL) {
uprintf("Caution: No '%s' was provided. The target will be missing a required Syslinux file!", &path[3]);
} else {
fclose(fd);
if (CopyFileU(&path[3], path, TRUE)) {
uprintf("Created '%s' (from '%s/%s-%s/%s') %s", path, FILES_DIR, syslinux,
embedded_sl_version_str[1], &path[3], IsFileInDB(&path[3])?"✓":"✗");
} else {
uprintf("Failed to create '%s': %s", path, WindowsErrorString());
}
}
} else if (IS_REACTOS(img_report)) {
uprintf("Setting up ReactOS...");
syslinux_mboot = GetResource(hMainInstance, MAKEINTRESOURCEA(IDR_SL_MBOOT_C32),
_RT_RCDATA, "mboot.c32", &syslinux_mboot_len, FALSE);
if (syslinux_mboot == NULL) {
goto out;
}
/* Create mboot.c32 file */
static_sprintf(path, "%C:\\%s", drive_letter, mboot_c32);
f_handle = CreateFileA(path, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (f_handle == INVALID_HANDLE_VALUE) {
uprintf("Unable to create '%s'\n", path);
goto out;
}
if (!WriteFileWithRetry(f_handle, syslinux_mboot, syslinux_mboot_len,
&bytes_written, WRITE_RETRIES)) {
uprintf("Could not write '%s'", path);
goto out;
}
safe_closehandle(f_handle);
static_sprintf(path, "%C:\\syslinux.cfg", drive_letter);
fd = fopen(path, "w");
if (fd == NULL) {
uprintf("Could not create ReactOS 'syslinux.cfg'");
goto out;
}
/* Write the syslinux.cfg for ReactOS */
fprintf(fd, "DEFAULT ReactOS\nLABEL ReactOS\n KERNEL %s\n APPEND %s",
mboot_c32, img_report.reactos_path);
fclose(fd);
}
if (bt != BT_ISO)
UpdateProgress(OP_DOS, -1.0f);
r = TRUE;
out:
safe_mm_free(sectbuf);
safe_free(syslinux_ldlinux[0]);
safe_free(syslinux_ldlinux[1]);
safe_free(sectors);
safe_closehandle(d_handle);
safe_closehandle(f_handle);
return r;
}
uint16_t GetSyslinuxVersion(char* buf, size_t buf_size, char** ext)
{
size_t i, j, k;
char *p;
uint16_t version;
const char LINUX[] = { 'L', 'I', 'N', 'U', 'X', ' ' };
static char* nullstr = "";
char unauthorized[] = {'<', '>', ':', '|', '*', '?', '\\', '/'};
*ext = nullstr;
if (buf_size < 256)
return 0;
// Start at 64 to avoid the short incomplete version at the beginning of ldlinux.sys
for (i=64; i<buf_size-64; i++) {
if (memcmp(&buf[i], LINUX, sizeof(LINUX)) == 0) {
// Check for ISO or SYS prefix
if (!( ((buf[i-3] == 'I') && (buf[i-2] == 'S') && (buf[i-1] == 'O'))
|| ((buf[i-3] == 'S') && (buf[i-2] == 'Y') && (buf[i-1] == 'S')) ))
continue;
i += sizeof(LINUX);
version = (((uint8_t)strtoul(&buf[i], &p, 10))<<8) + (uint8_t)strtoul(&p[1], &p, 10);
if (version == 0)
continue;
p[safe_strlen(p)] = 0;
// Ensure that our extra version string starts with a slash
*p = '/';
// Remove the x.yz- duplicate if present
for (j=0; (buf[i+j] == p[1+j]) && (buf[i+j] != ' '); j++);
if (p[j+1] == '-')
j++;
if (j >= 4) {
p[j] = '/';
p = &p[j];
}
for (j=safe_strlen(p)-1; j>0; j--) {
// Arch Linux affixes a star for their version - who knows what else is out there...
if ((p[j] == ' ') || (p[j] == '*'))
p[j] = 0;
else
break;
}
// Sanitize the string
for (j=1; j<safe_strlen(p); j++) {
// Some people are bound to have invalid chars in their date strings
for (k=0; k<sizeof(unauthorized); k++) {
if (p[j] == unauthorized[k])
p[j] = '_';
}
}
// If all we have is a slash, return the empty string for the extra version
*ext = (p[1] == 0)?nullstr:p;
return version;
}
}
return 0;
}
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