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pcloudcc-lneely/pclsync/putil.c

375 lines
11 KiB
C
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#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/random.h>
#include "pdbg.h"
#include "putil.h"
static char normalize_table[256];
const char base64_table[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'};
static const char base64_reverse_table[256] = {
-2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -2, -1, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, 62, -2, 62, -2, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60,
61, -2, -2, -2, -1, -2, -2, -2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2,
63, -2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2};
__attribute((constructor)) static void init() {
unsigned long i;
for (i = 0; i < 256; i++) {
normalize_table[i] = i;
}
normalize_table[':'] = '_';
normalize_table['/'] = '_';
normalize_table['\\'] = '_';
}
// putil_wipe wipes a segment of memory mem of size sz using a DoD 5220.22-M
// compliant 3-pass wipe.
void putil_wipe(void *mem, size_t sz) {
if (!mem || sz == 0) { return; }
volatile unsigned char *p = (volatile unsigned char *)mem;
memset((void*)p, 0x00, sz);
memset((void*)p, 0xFF, sz);
ssize_t result = getrandom((void*)p, sz, 0);
if (result != (ssize_t)sz) {
if (result == -1) {
pdbg_logf(D_WARNING, "getrandom() failed: %s.", strerror(errno));
} else {
pdbg_logf(D_WARNING, "getrandom() returned partial data.");
}
pdbg_logf(D_WARNING, "falling back to less secure third pass. This may occur due to insufficient entropy, early boot state, or kernel incompatibility.");
srand((unsigned int)(time(NULL) ^ (uintptr_t)&srand));
for (size_t i = 0; i < sz; i++) {
p[i] = (unsigned char)rand();
}
}
}
void time_format(time_t tm, unsigned long ns, char *result) {
static const char month_names[12][4] = {"Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec"};
static const char day_names[7][4] = {"Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat"};
struct tm dt;
unsigned long y;
ns /= 1000000;
gmtime_r(&tm, &dt);
memcpy(result, day_names[dt.tm_wday], 3);
result += 3;
*result++ = ',';
*result++ = ' ';
*result++ = dt.tm_mday / 10 + '0';
*result++ = dt.tm_mday % 10 + '0';
*result++ = ' ';
memcpy(result, month_names[dt.tm_mon], 3);
result += 3;
*result++ = ' ';
y = dt.tm_year + 1900;
*result++ = '0' + y / 1000;
y = y % 1000;
*result++ = '0' + y / 100;
y = y % 100;
*result++ = '0' + y / 10;
y = y % 10;
*result++ = '0' + y;
*result++ = ' ';
*result++ = dt.tm_hour / 10 + '0';
*result++ = dt.tm_hour % 10 + '0';
*result++ = ':';
*result++ = dt.tm_min / 10 + '0';
*result++ = dt.tm_min % 10 + '0';
*result++ = ':';
*result++ = dt.tm_sec / 10 + '0';
*result++ = dt.tm_sec % 10 + '0';
*result++ = '.';
*result++ = ns / 100 + '0';
*result++ = (ns / 10) % 10 + '0';
*result++ = ns % 10 + '0';
memcpy(result, " +0000", 7); // copies the null byte
}
char *psync_strdup(const char *str) {
size_t len;
len = strlen(str) + 1;
return (char *)memcpy(malloc(sizeof(char) * len), str, len);
}
char *psync_strnormalize_filename(const char *str) {
size_t len, i;
char *ptr;
len = strlen(str) + 1;
ptr = malloc(sizeof(char) * len);
for (i = 0; i < len; i++)
ptr[i] = normalize_table[(unsigned char)str[i]];
return ptr;
}
char *psync_strndup(const char *str, size_t len) {
char *ptr;
ptr = (char *)memcpy(malloc(sizeof(char) * len + 1), str, len);
ptr[len] = 0;
return ptr;
}
char *psync_strcat(const char *str, ...) {
size_t i, size, len;
const char *strs[64];
size_t lengths[64];
const char *ptr;
char *ptr2, *ptr3;
va_list ap;
va_start(ap, str);
strs[0] = str;
len = strlen(str);
lengths[0] = len;
size = len + 1;
i = 1;
while ((ptr = va_arg(ap, const char *))) {
pdbg_assert(i < ARRAY_SIZE(strs));
len = strlen(ptr);
lengths[i] = len;
strs[i++] = ptr;
size += len;
}
va_end(ap);
ptr2 = ptr3 = (char *)malloc(size);
for (size = 0; size < i; size++) {
memcpy(ptr2, strs[size], lengths[size]);
ptr2 += lengths[size];
}
*ptr2 = 0;
return ptr3;
}
int psync_slprintf(char *str, size_t size, const char *format, ...) {
va_list ap;
int ret;
va_start(ap, format);
ret = vsnprintf(str, size, format, ap);
va_end(ap);
if (pdbg_unlikely(ret >= size))
str[size - 1] = 0;
return ret;
}
unsigned char *psync_base32_encode(const unsigned char *str, size_t length,
size_t *ret_length) {
static const unsigned char *table =
(const unsigned char *)"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
unsigned char *result;
unsigned char *p;
uint32_t bits, buff;
result = (unsigned char *)malloc(((length + 4) / 5) * 8 + 1);
p = result;
bits = 0;
buff = 0; // don't really have to initialize this one, but a compiler that
// will detect that this is safe is yet to be born
while (length) {
if (bits < 5) {
buff = (buff << 8) | (*str++);
length--;
bits += 8;
}
bits -= 5;
*p++ = table[0x1f & (buff >> bits)];
}
while (bits) {
if (bits < 5) {
buff <<= (5 - bits);
bits = 5;
}
bits -= 5;
*p++ = table[0x1f & (buff >> bits)];
}
*ret_length = p - result;
*p = 0;
return result;
}
unsigned char *psync_base32_decode(const unsigned char *str, size_t length,
size_t *ret_length) {
unsigned char *result, *p;
uint32_t bits, buff;
unsigned char ch;
result = (unsigned char *)malloc((length + 7) / 8 * 5 + 1);
p = result;
bits = 0;
buff = 0;
while (length) {
ch = *str++;
length--;
if (ch >= 'A' && ch <= 'Z')
ch = (ch & 0x1f) - 1;
else if (ch >= '2' && ch <= '7')
ch -= '2' - 26;
else {
free(result);
return NULL;
}
buff = (buff << 5) + ch;
bits += 5;
if (bits >= 8) {
bits -= 8;
*p++ = buff >> bits;
}
}
*p = 0;
*ret_length = p - result;
return result;
}
unsigned char *psync_base64_encode(const unsigned char *str, size_t length,
size_t *ret_length) {
const unsigned char *current = str;
unsigned char *p;
unsigned char *result;
result = (unsigned char *)malloc(((length + 2) / 3) * 4 + 1);
p = result;
while (length > 2) {
*p++ = base64_table[current[0] >> 2];
*p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
*p++ = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
*p++ = base64_table[current[2] & 0x3f];
current += 3;
length -= 3;
}
if (length != 0) {
*p++ = base64_table[current[0] >> 2];
if (length > 1) {
*p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
*p++ = base64_table[(current[1] & 0x0f) << 2];
*p++ = '='; /* Add padding */
} else {
*p++ = base64_table[(current[0] & 0x03) << 4];
*p++ = '='; /* Add padding */
*p++ = '='; /* Add padding */
}
}
*ret_length = p - result;
*p = 0;
return result;
}
unsigned char *psync_base64_decode(const unsigned char *str, size_t length,
size_t *ret_length) {
const unsigned char *current = str;
unsigned char *result;
size_t i = 0, j = 0;
ssize_t ch;
result = (unsigned char *)malloc((length + 3) / 4 * 3 + 1);
while (length-- > 0) {
ch = base64_reverse_table[*current++];
if (ch == -1)
continue;
else if (ch == -2) {
free(result);
return NULL;
}
switch (i % 4) {
case 0:
result[j] = ch << 2;
break;
case 1:
result[j++] |= ch >> 4;
result[j] = (ch & 0x0f) << 4;
break;
case 2:
result[j++] |= ch >> 2;
result[j] = (ch & 0x03) << 6;
break;
case 3:
result[j++] |= ch;
break;
}
i++;
}
*ret_length = j;
result[j] = 0;
return result;
}
int psync_is_valid_utf8(const char *str) {
static const int8_t trailing[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, -1, -1, -1, -1,
-1, -1, -1, -1};
int8_t t;
while (*str) {
t = trailing[(unsigned char)*str++];
if (unlikely(t)) {
if (t < 0)
return 0;
while (t--)
if ((((unsigned char)*str++) & 0xc0) != 0x80)
return 0;
}
}
return 1;
}
uint64_t psync_ato64(const char *str) {
uint64_t n = 0;
while (*str >= '0' && *str <= '9')
n = n * 10 + (*str++) - '0';
return n;
}
uint32_t psync_ato32(const char *str) {
uint32_t n = 0;
while (*str >= '0' && *str <= '9')
n = n * 10 + (*str++) - '0';
return n;
}
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