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|
/*
* 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 = NULL, *gbe2 = NULL;
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;
if ((gbe = (uint8_t *) malloc(SIZE_8KB)) == NULL)
err(errno, NULL);
gbe2 = gbe + SIZE_4KB;
nvmPartModified[0] = 0;
nvmPartModified[1] = 0;
test = 1;
little_endian = ((uint8_t *) &test)[0];
#ifdef HAVE_PLEDGE
if (pledge("stdio wpath", NULL) == -1)
err(errno, "pledge");
#endif
if (argc == 3) {
if (strcmp(COMMAND, "dump") == 0) {
#ifdef HAVE_PLEDGE
if (pledge("stdio rpath", NULL) == -1)
err(errno, "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) {
if (fstat((*fd), &st) == -1)
return -1;
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;
else if (errno != 0)
return -1;
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)
goto invalid_mac_address;
if ((byte == 0) && (nib == 1)) {
if (strMac[o + nib] == '?')
val8 = (val8 & 0xE) | 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(errno, NULL);
if (rfd != -1) {
if (close(rfd))
err(errno, "/dev/urandom");
rfd = -1;
}
if (readFromFile(&rfd, rbuf, "/dev/urandom", O_RDONLY, BUFSIZ)
!= BUFSIZ)
err(errno, "/dev/urandom");
if (errno != 0)
err(errno, "/dev/urandom");
}
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;
size_t g1 = (size_t) gbe;
size_t g2 = (size_t) gbe2;
part0 = validChecksum(0);
part1 = validChecksum(1);
if (part0 || part1) {
g1 ^= g2;
g2 ^= g1;
g1 ^= g2;
gbe = (uint8_t *) g1;
gbe2 = (uint8_t *) g2;
gbeFileModified = 1;
nvmPartModified[0] = 1;
nvmPartModified[1] = 1;
errno = 0;
}
}
void
cmd_copy(void)
{
if (validChecksum(part)) {
if (part)
gbe = gbe2;
else
gbe2 = gbe;
gbeFileModified = 1;
nvmPartModified[part ^ 1] = 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_4KB, 0) != SIZE_4KB)
err(errno, "%s", filename);
if (pwrite((*fd), gbe2, SIZE_4KB, SIZE_4KB) != SIZE_4KB)
err(errno, "%s", filename);
if (close((*fd)))
err(errno, "%s", filename);
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);
}
|