455 lines
9.0 KiB
C
455 lines
9.0 KiB
C
/*
|
|
* Copyright (C) 2022 Leah Rowe <info@minifree.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <dirent.h>
|
|
#include <err.h>
|
|
|
|
ssize_t readFromFile(int *fd, uint8_t *buf, const char *path, int flags,
|
|
size_t size);
|
|
void cmd_setmac(const char *strMac);
|
|
uint8_t hextonum(char chs);
|
|
uint8_t rhex(void);
|
|
void cmd_dump(void);
|
|
void showmac(int partnum);
|
|
void hexdump(int partnum);
|
|
void cmd_setchecksum(void);
|
|
void cmd_brick(void);
|
|
void cmd_swap(void);
|
|
void cmd_copy(void);
|
|
int validChecksum(int partnum);
|
|
uint16_t word(int pos16, int partnum);
|
|
void setWord(int pos16, int partnum, uint16_t val);
|
|
void byteswap(uint8_t *byte);
|
|
void writeGbeFile(int *fd, const char *filename);
|
|
|
|
#define FILENAME argv[1]
|
|
#define COMMAND argv[2]
|
|
#define MAC_ADDRESS argv[3]
|
|
#define PARTNUM argv[3]
|
|
#define SIZE_4KB 0x1000
|
|
#define SIZE_8KB 0x2000
|
|
|
|
uint8_t gbe[SIZE_8KB];
|
|
int part, gbeFileModified = 0;
|
|
uint8_t nvmPartModified[2];
|
|
|
|
uint16_t test;
|
|
uint8_t little_endian;
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd;
|
|
int flags = O_RDWR;
|
|
char *strMac = NULL;
|
|
char *strRMac = "??:??:??:??:??:??";
|
|
void (*cmd)(void) = NULL;
|
|
|
|
nvmPartModified[0] = 0;
|
|
nvmPartModified[1] = 0;
|
|
|
|
test = 1;
|
|
little_endian = ((uint8_t *) &test)[0];
|
|
|
|
#ifdef HAVE_PLEDGE
|
|
if (pledge("stdio wpath", NULL) == -1)
|
|
err(1, "pledge");
|
|
#endif
|
|
if (argc == 3) {
|
|
if (strcmp(COMMAND, "dump") == 0) {
|
|
#ifdef HAVE_PLEDGE
|
|
if (pledge("stdio rpath", NULL) == -1)
|
|
err(1, "pledge");
|
|
#endif
|
|
flags = O_RDONLY;
|
|
cmd = &cmd_dump;
|
|
} else if (strcmp(COMMAND, "setmac") == 0)
|
|
strMac = strRMac;
|
|
else if (strcmp(COMMAND, "swap") == 0)
|
|
cmd = &cmd_swap;
|
|
} else if (argc == 4) {
|
|
if (strcmp(COMMAND, "setmac") == 0)
|
|
strMac = MAC_ADDRESS;
|
|
else if ((!((part = PARTNUM[0] - '0') == 0 || part == 1))
|
|
|| PARTNUM[1])
|
|
errno = EINVAL;
|
|
else if (strcmp(COMMAND, "setchecksum") == 0)
|
|
cmd = &cmd_setchecksum;
|
|
else if (strcmp(COMMAND, "brick") == 0)
|
|
cmd = &cmd_brick;
|
|
else if (strcmp(COMMAND, "copy") == 0)
|
|
cmd = &cmd_copy;
|
|
}
|
|
|
|
if ((strMac == NULL) && (cmd == NULL))
|
|
errno = EINVAL;
|
|
else if (readFromFile(&fd, gbe, FILENAME, flags, SIZE_8KB) != SIZE_8KB)
|
|
goto nvmutil_exit;
|
|
|
|
if (errno == 0) {
|
|
if (strMac != NULL)
|
|
cmd_setmac(strMac);
|
|
else if (cmd != NULL)
|
|
(*cmd)();
|
|
|
|
if (gbeFileModified)
|
|
writeGbeFile(&fd, FILENAME);
|
|
}
|
|
|
|
nvmutil_exit:
|
|
if (!((errno == ECANCELED) && (flags == O_RDONLY)))
|
|
if (errno != 0)
|
|
fprintf(stderr, "%s\n", strerror(errno));
|
|
|
|
return errno;
|
|
}
|
|
|
|
ssize_t
|
|
readFromFile(int *fd, uint8_t *buf, const char *path, int flags, size_t size)
|
|
{
|
|
struct stat st;
|
|
|
|
if (opendir(path) != NULL) {
|
|
errno = EISDIR;
|
|
return -1;
|
|
} else if (((*fd) = open(path, flags)) == -1) {
|
|
return -1;
|
|
} else if (size == SIZE_8KB) {
|
|
fstat((*fd), &st);
|
|
if ((st.st_size != SIZE_8KB) && strcmp(path, "/dev/urandom")) {
|
|
fprintf(stderr, "Bad file size\n");
|
|
errno = ECANCELED;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (errno == ENOTDIR)
|
|
errno = 0;
|
|
|
|
return read((*fd), buf, size);
|
|
}
|
|
|
|
void
|
|
cmd_setmac(const char *strMac)
|
|
{
|
|
uint8_t o, val8;
|
|
uint16_t val16;
|
|
int partnum, byte, nib;
|
|
uint16_t mac[3] = {0, 0, 0};
|
|
uint64_t total = 0;
|
|
|
|
if (strnlen(strMac, 20) != 17)
|
|
goto invalid_mac_address;
|
|
|
|
for (o = 0; o < 16; o += 3) {
|
|
if (o != 15)
|
|
if (strMac[o + 2] != ':')
|
|
goto invalid_mac_address;
|
|
byte = o / 3;
|
|
for (nib = 0; nib < 2; nib++, total += val8) {
|
|
if ((val8 = hextonum(strMac[o + nib])) > 15) {
|
|
if (errno != 0)
|
|
return;
|
|
goto invalid_mac_address;
|
|
} else if ((byte == 0 && (nib == 1))) {
|
|
val8 &= 0xE;
|
|
val8 |= 2;
|
|
}
|
|
|
|
val16 = val8;
|
|
if ((byte % 2) ^ 1)
|
|
byteswap((uint8_t *) &val16);
|
|
val16 <<= 4 * (nib ^ 1);
|
|
mac[byte >> 1] |= val16;
|
|
}
|
|
}
|
|
|
|
test = mac[0];
|
|
if (little_endian)
|
|
byteswap((uint8_t *) &test);
|
|
if (total == 0 || (((uint8_t *) &test)[0] & 1))
|
|
goto invalid_mac_address;
|
|
|
|
if (little_endian)
|
|
for (o = 0; o < 3; o++)
|
|
byteswap((uint8_t *) &mac[o]);
|
|
|
|
for (partnum = 0; partnum < 2; partnum++) {
|
|
if (!validChecksum(partnum))
|
|
continue;
|
|
for (o = 0; o < 3; o++)
|
|
setWord(o, partnum, mac[o]);
|
|
part = partnum;
|
|
cmd_setchecksum();
|
|
}
|
|
|
|
return;
|
|
invalid_mac_address:
|
|
fprintf(stderr, "Bad MAC address\n");
|
|
errno = ECANCELED;
|
|
}
|
|
|
|
uint8_t
|
|
hextonum(char chs)
|
|
{
|
|
uint8_t val8, ch;
|
|
ch = (uint8_t) chs;
|
|
|
|
if ((ch >= '0') && (ch <= '9'))
|
|
val8 = ch - '0';
|
|
else if ((ch >= 'A') && (ch <= 'F'))
|
|
val8 = ch - 'A' + 10;
|
|
else if ((ch >= 'a') && (ch <= 'f'))
|
|
val8 = ch - 'a' + 10;
|
|
else if (ch == '?')
|
|
val8 = rhex();
|
|
else
|
|
return 16;
|
|
|
|
return val8;
|
|
}
|
|
|
|
uint8_t
|
|
rhex(void)
|
|
{
|
|
static int rfd = -1;
|
|
static uint8_t *rbuf = NULL;
|
|
static size_t rindex = BUFSIZ;
|
|
|
|
if ((rindex == BUFSIZ)) {
|
|
rindex = 0;
|
|
if ((rbuf == NULL))
|
|
if ((rbuf = (uint8_t *) malloc(BUFSIZ)) == NULL)
|
|
err(1, NULL);
|
|
if ((rfd != -1)) {
|
|
close(rfd);
|
|
rfd = -1;
|
|
}
|
|
if (readFromFile(&rfd, rbuf, "/dev/urandom", O_RDONLY, BUFSIZ)
|
|
!= BUFSIZ) {
|
|
warn("%s", "/dev/urandom");
|
|
return 16;
|
|
}
|
|
if ((errno != 0))
|
|
return 16;
|
|
}
|
|
|
|
return rbuf[rindex++] & 0xf;
|
|
}
|
|
|
|
void
|
|
cmd_dump(void)
|
|
{
|
|
int numInvalid, partnum;
|
|
|
|
numInvalid = 0;
|
|
for (partnum = 0; (partnum < 2); partnum++) {
|
|
if (!validChecksum(partnum))
|
|
++numInvalid;
|
|
|
|
printf("MAC (part %d): ", partnum);
|
|
showmac(partnum);
|
|
|
|
hexdump(partnum);
|
|
}
|
|
if (numInvalid < 2)
|
|
errno = 0;
|
|
}
|
|
|
|
void
|
|
showmac(int partnum)
|
|
{
|
|
int c;
|
|
uint16_t val16;
|
|
uint8_t *byte;
|
|
|
|
for (c = 0; c < 3; c++) {
|
|
val16 = word(c, partnum);
|
|
byte = (uint8_t *) &val16;
|
|
|
|
if (!little_endian)
|
|
byteswap(byte);
|
|
|
|
printf("%02x:%02x", byte[0], byte[1]);
|
|
if (c == 2)
|
|
printf("\n");
|
|
else
|
|
printf(":");
|
|
}
|
|
}
|
|
|
|
void
|
|
hexdump(int partnum)
|
|
{
|
|
int row, c;
|
|
uint16_t val16;
|
|
uint8_t *byte;
|
|
|
|
for (row = 0; row < 8; row++) {
|
|
printf("%07x ", row << 4);
|
|
for (c = 0; c < 8; c++) {
|
|
val16 = word((row << 3) + c, partnum);
|
|
byte = (uint8_t *) &val16;
|
|
|
|
if (!little_endian)
|
|
byteswap(byte);
|
|
|
|
printf("%02x%02x ", byte[1], byte[0]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
void
|
|
cmd_setchecksum(void)
|
|
{
|
|
int c;
|
|
uint16_t val16 = 0;
|
|
|
|
for (c = 0; c < 0x3F; c++)
|
|
val16 += word(c, part);
|
|
|
|
setWord(0x3F, part, 0xBABA - val16);
|
|
}
|
|
|
|
void
|
|
cmd_brick(void)
|
|
{
|
|
if (validChecksum(part))
|
|
setWord(0x3F, part, (word(0x3F, part)) ^ 0xFF);
|
|
}
|
|
|
|
void
|
|
cmd_swap(void)
|
|
{
|
|
int part0, part1;
|
|
|
|
part0 = validChecksum(0);
|
|
part1 = validChecksum(1);
|
|
|
|
if ((part0 | part1)) {
|
|
for(part0 = 0; part0 < SIZE_4KB; part0++) {
|
|
gbe[part0] ^= gbe[part1 = (part0 | SIZE_4KB)];
|
|
gbe[part1] ^= gbe[part0];
|
|
gbe[part0] ^= gbe[part1];
|
|
}
|
|
|
|
gbeFileModified = 1;
|
|
nvmPartModified[0] = 1;
|
|
nvmPartModified[1] = 1;
|
|
|
|
errno = 0;
|
|
}
|
|
}
|
|
|
|
void
|
|
cmd_copy(void)
|
|
{
|
|
int src = (part << 12);
|
|
|
|
int destPart = (part ^ 1);
|
|
int dest = (destPart << 12);
|
|
|
|
if (validChecksum(part)) {
|
|
memcpy((gbe + dest), (gbe + src), SIZE_4KB);
|
|
|
|
gbeFileModified = 1;
|
|
nvmPartModified[destPart] = 1;
|
|
}
|
|
}
|
|
|
|
int
|
|
validChecksum(int partnum)
|
|
{
|
|
int w;
|
|
uint16_t total = 0;
|
|
|
|
for(w = 0; w <= 0x3F; w++)
|
|
total += word(w, partnum);
|
|
|
|
if (total == 0xBABA)
|
|
return 1;
|
|
|
|
fprintf(stderr, "WARNING: BAD checksum in part %d\n", partnum);
|
|
errno = ECANCELED;
|
|
return 0;
|
|
}
|
|
|
|
uint16_t
|
|
word(int pos16, int partnum)
|
|
{
|
|
uint16_t val16 = ((uint16_t *) gbe)[pos16 + (partnum << 11)];
|
|
if (!little_endian)
|
|
byteswap((uint8_t *) &val16);
|
|
|
|
return val16;
|
|
}
|
|
|
|
void
|
|
setWord(int pos16, int partnum, uint16_t val)
|
|
{
|
|
((uint16_t *) gbe)[pos16 + (partnum << 11)] = val;
|
|
if (!little_endian)
|
|
byteswap(gbe + (pos16 << 1) + (partnum << 12));
|
|
|
|
gbeFileModified = 1;
|
|
nvmPartModified[partnum] = 1;
|
|
}
|
|
|
|
void
|
|
byteswap(uint8_t *byte)
|
|
{
|
|
byte[0] ^= byte[1];
|
|
byte[1] ^= byte[0];
|
|
byte[0] ^= byte[1];
|
|
}
|
|
|
|
void
|
|
writeGbeFile(int *fd, const char *filename)
|
|
{
|
|
int partnum;
|
|
errno = 0;
|
|
|
|
if (pwrite((*fd), gbe, SIZE_8KB, 0) == SIZE_8KB)
|
|
close((*fd));
|
|
if (errno != 0)
|
|
return;
|
|
|
|
for (partnum = 0; partnum < 2; partnum++) {
|
|
if (nvmPartModified[partnum])
|
|
printf("Part %d modified\n", partnum);
|
|
else
|
|
fprintf (stderr,
|
|
"Part %d NOT modified\n", partnum);
|
|
}
|
|
printf("File `%s` successfully modified\n", filename);
|
|
}
|