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// SPDX-License-Identifier: GPL-2.0+
/*
* Utility functions for the 'fsverity' program
*
* Copyright (C) 2018 Google LLC
*
* Written by Eric Biggers.
*/
#include "util.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
/* ========== Memory allocation ========== */
void *xmalloc(size_t size)
{
void *p = malloc(size);
if (!p)
fatal_error("out of memory");
return p;
}
void *xzalloc(size_t size)
{
return memset(xmalloc(size), 0, size);
}
void *xmemdup(const void *mem, size_t size)
{
return memcpy(xmalloc(size), mem, size);
}
char *xstrdup(const char *s)
{
return xmemdup(s, strlen(s) + 1);
}
/* ========== Error messages and assertions ========== */
void do_error_msg(const char *format, va_list va, int err)
{
fputs("ERROR: ", stderr);
vfprintf(stderr, format, va);
if (err)
fprintf(stderr, ": %s", strerror(err));
putc('\n', stderr);
}
void error_msg(const char *format, ...)
{
va_list va;
va_start(va, format);
do_error_msg(format, va, 0);
va_end(va);
}
void error_msg_errno(const char *format, ...)
{
va_list va;
va_start(va, format);
do_error_msg(format, va, errno);
va_end(va);
}
__noreturn void fatal_error(const char *format, ...)
{
va_list va;
va_start(va, format);
do_error_msg(format, va, 0);
va_end(va);
abort();
}
__noreturn void assertion_failed(const char *expr, const char *file, int line)
{
fatal_error("Assertion failed: %s at %s:%d", expr, file, line);
}
/* ========== File utilities ========== */
bool open_file(struct filedes *file, const char *filename, int flags, int mode)
{
file->fd = open(filename, flags, mode);
if (file->fd < 0) {
error_msg_errno("can't open '%s' for %s", filename,
(flags & O_ACCMODE) == O_RDONLY ? "reading" :
(flags & O_ACCMODE) == O_WRONLY ? "writing" :
"reading and writing");
return false;
}
file->name = xstrdup(filename);
return true;
}
bool get_file_size(struct filedes *file, u64 *size_ret)
{
struct stat stbuf;
if (fstat(file->fd, &stbuf) != 0) {
error_msg_errno("can't stat file '%s'", file->name);
return false;
}
*size_ret = stbuf.st_size;
return true;
}
bool full_read(struct filedes *file, void *buf, size_t count)
{
while (count) {
int n = read(file->fd, buf, min(count, INT_MAX));
if (n < 0) {
error_msg_errno("reading from '%s'", file->name);
return false;
}
if (n == 0) {
error_msg("unexpected end-of-file on '%s'", file->name);
return false;
}
buf += n;
count -= n;
}
return true;
}
bool full_write(struct filedes *file, const void *buf, size_t count)
{
while (count) {
int n = write(file->fd, buf, min(count, INT_MAX));
if (n < 0) {
error_msg_errno("writing to '%s'", file->name);
return false;
}
buf += n;
count -= n;
}
return true;
}
bool filedes_close(struct filedes *file)
{
int res;
if (file->fd < 0)
return true;
res = close(file->fd);
if (res != 0)
error_msg_errno("closing '%s'", file->name);
file->fd = -1;
free(file->name);
file->name = NULL;
return res == 0;
}
/* ========== String utilities ========== */
static int hex2bin_char(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return 10 + (c - 'a');
if (c >= 'A' && c <= 'F')
return 10 + (c - 'A');
return -1;
}
bool hex2bin(const char *hex, u8 *bin, size_t bin_len)
{
if (strlen(hex) != 2 * bin_len)
return false;
while (bin_len--) {
int hi = hex2bin_char(*hex++);
int lo = hex2bin_char(*hex++);
if (hi < 0 || lo < 0)
return false;
*bin++ = (hi << 4) | lo;
}
return true;
}
static char bin2hex_char(u8 nibble)
{
ASSERT(nibble <= 0xf);
if (nibble < 10)
return '0' + nibble;
return 'a' + (nibble - 10);
}
void bin2hex(const u8 *bin, size_t bin_len, char *hex)
{
while (bin_len--) {
*hex++ = bin2hex_char(*bin >> 4);
*hex++ = bin2hex_char(*bin & 0xf);
bin++;
}
*hex = '\0';
}
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