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util.c
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util.c
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/*
* utility functions
*
* Copyright (C) 2014-2018 LastPass.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
*
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*
* See LICENSE.OpenSSL for more details regarding this exception.
*
* reallocarray is:
* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>.
* strlcpy and strlcat are:
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>.
* For reallocarray, strlcpy, and strlcat:
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "util.h"
#include "process.h"
#include "terminal.h"
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <openssl/rand.h>
void warn(const char *err, ...)
{
char message[4096];
va_list params;
va_start(params, err);
vsnprintf(message, sizeof(message), err, params);
va_end(params);
terminal_fprintf(stderr, TERMINAL_FG_YELLOW TERMINAL_BOLD "Warning" TERMINAL_RESET ": %s\n", message);
}
void warn_errno(const char *err, ...)
{
char message[4096], *error_message;
va_list params;
error_message = strerror(errno);
va_start(params, err);
vsnprintf(message, sizeof(message), err, params);
va_end(params);
terminal_fprintf(stderr, TERMINAL_FG_YELLOW TERMINAL_BOLD "WARNING" TERMINAL_RESET ": " TERMINAL_FG_YELLOW "%s" TERMINAL_RESET ": %s\n", error_message, message);
}
_noreturn_ void die(const char *err, ...)
{
char message[4096];
va_list params;
va_start(params, err);
vsnprintf(message, sizeof(message), err, params);
va_end(params);
terminal_fprintf(stderr, TERMINAL_FG_RED TERMINAL_BOLD "Error" TERMINAL_RESET ": %s\n", message);
exit(1);
}
_noreturn_ void die_errno(const char *err, ...)
{
char message[4096], *error_message;
va_list params;
error_message = strerror(errno);
va_start(params, err);
vsnprintf(message, sizeof(message), err, params);
va_end(params);
terminal_fprintf(stderr, TERMINAL_FG_RED TERMINAL_BOLD "Error" TERMINAL_RESET ": " TERMINAL_FG_RED "%s" TERMINAL_RESET ": %s\n", error_message, message);
exit(1);
}
void die_usage(const char *usage)
{
terminal_fprintf(stderr, "Usage: %s %s\n", ARGV[0], usage);
exit(1);
}
char ask_options(char *options, char def, const char *prompt, ...)
{
va_list params;
_cleanup_free_ char *response = NULL;
size_t len = 0;
unsigned int i;
for (;;) {
va_start(params, prompt);
terminal_fprintf(stderr, TERMINAL_FG_YELLOW);
vfprintf(stderr, prompt, params);
terminal_fprintf(stderr, TERMINAL_RESET);
va_end(params);
terminal_fprintf(stderr, " [");
for (i = 0; i < strlen(options); i++) {
if (options[i] == def) {
terminal_fprintf(stderr,TERMINAL_BOLD "%c" TERMINAL_RESET, toupper(options[i]));
} else {
terminal_fprintf(stderr, "%c", options[i]);
}
if (i < strlen(options)-1)
terminal_fprintf(stderr, "/");
else
terminal_fprintf(stderr, "] ");
}
if (getline(&response, &len, stdin) < 0)
die("aborted response.");
strlower(response);
if (!strcmp("\n", response))
return def;
if (strlen(response) && strchr(options, response[0]))
return response[0];
terminal_fprintf(stderr, TERMINAL_FG_RED TERMINAL_BOLD "Error" TERMINAL_RESET ": Response not understood.\n");
free(response);
response = NULL;
len = 0;
}
}
bool ask_yes_no(bool default_yes, const char *prompt, ...)
{
va_list params;
char message[4096];
va_start(params, prompt);
vsnprintf(message, sizeof(message), prompt, params);
va_end(params);
return ask_options("yn", (default_yes) ? 'y' : 'n', message) == 'y';
}
void *xmalloc(size_t size)
{
void *ret = malloc(size);
if (likely(ret))
return ret;
die_errno("malloc(%zu)", size);
}
void *xcalloc(size_t nmemb, size_t size)
{
void *ret = calloc(nmemb, size);
if (likely(ret))
return ret;
die_errno("calloc(%zu, %zu)", nmemb, size);
}
void *xrealloc(void *ptr, size_t size)
{
void *ret = realloc(ptr, size);
if (likely(ret))
return ret;
die_errno("realloc(%p, %zu)", ptr, size);
}
void *reallocarray(void *optr, size_t nmemb, size_t size)
{
if (!size || !nmemb) {
errno = ENOMEM;
return NULL;
}
if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
nmemb > 0 && SIZE_MAX / nmemb < size) {
errno = ENOMEM;
return NULL;
}
return realloc(optr, size * nmemb);
}
void *xreallocarray(void *ptr, size_t nmemb, size_t size)
{
void *ret = reallocarray(ptr, nmemb, size);
if (likely(ret))
return ret;
die_errno("reallocarray(%p, %zu, %zu)", ptr, nmemb, size);
}
void *xstrdup(const char *str)
{
void *ret = strdup(str);
if (likely(ret))
return ret;
die_errno("strdup(%p)", (void *) str);
}
void *xstrndup(const char *str, size_t maxlen)
{
void *ret = strndup(str, maxlen);
if (likely(ret))
return ret;
die_errno("strndup(%p, %zu)", (void *) str, maxlen);
}
int xasprintf(char **strp, const char *fmt, ...)
{
va_list params;
int ret;
va_start(params, fmt);
ret = xvasprintf(strp, fmt, params);
va_end(params);
return ret;
}
int xvasprintf(char **strp, const char *fmt, va_list ap)
{
int ret;
ret = vasprintf(strp, fmt, ap);
if (ret == -1)
die_errno("asprintf(%p, %s, ...)", (void *)strp, fmt);
return ret;
}
#ifdef __GLIBC__
size_t strlcpy(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
/* Copy as many bytes as will fit */
if (n != 0) {
while (--n != 0) {
if ((*d++ = *s++) == '\0')
break;
}
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (siz != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return (s - src - 1); /* count does not include NUL */
}
size_t strlcat(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = siz - dlen;
if (n == 0)
return (dlen + strlen(s));
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
n--;
}
s++;
}
*d = '\0';
return (dlen + (s - src)); /* count does not include NUL */
}
#else
char *strchrnul(const char *s, int c)
{
char *p = strchr(s, c);
if (!p)
p = (char *)s + strlen(s);
return p;
}
#endif
void strlower(char *str)
{
for (; *str; ++str)
*str = tolower(*str);
}
void strupper(char *str)
{
for (; *str; ++str)
*str = toupper(*str);
}
char *xstrlower(const char *str)
{
char *copy = xstrdup(str);
strlower(copy);
return copy;
}
char *xstrupper(const char *str)
{
char *copy = xstrdup(str);
strupper(copy);
return copy;
}
char *xultostr(unsigned long num)
{
char *str;
xasprintf(&str, "%ld", num);
return str;
}
bool starts_with(const char *str, const char *start)
{
for (; ; ++str, ++start) {
if (!*start)
return true;
else if (*str != *start)
return false;
}
}
bool ends_with(const char *str, const char *end)
{
int str_len = strlen(str);
int end_len = strlen(end);
if (str_len < end_len)
return false;
else
return !strcmp(str + str_len - end_len, end);
}
char *trim(char *str)
{
int start, i;
for (start = 0; isspace(str[start]) && str[start]; ++start);
for (i = 0; str[i + start]; ++i)
str[i] = str[i + start];
str[i] = '\0';
for (--i; i >= 0 && isspace(str[i]); --i)
str[i] = '\0';
return str;
}
void xstrappend(char **str, const char *suffix)
{
if (!*str) {
*str = xstrdup(suffix);
return;
}
size_t len = strlen(*str) + strlen(suffix) + 1;
*str = xrealloc(*str, len);
strlcat(*str, suffix, len);
}
void xstrappendf(char **str, const char *suffixfmt, ...)
{
_cleanup_free_ char *fmt = NULL;
va_list args;
va_start(args, suffixfmt);
xvasprintf(&fmt, suffixfmt, args);
va_end(args);
xstrappend(str, fmt);
}
void xstrprepend(char **str, const char *prefix)
{
if (!*str) {
*str = xstrdup(prefix);
return;
}
size_t len = strlen(*str) + strlen(prefix) + 1;
char *new = xmalloc(len);
strlcpy(new, prefix, len);
strlcat(new, *str, len);
free(*str);
*str = new;
}
void xstrprependf(char **str, const char *suffixfmt, ...)
{
_cleanup_free_ char *fmt = NULL;
va_list args;
va_start(args, suffixfmt);
xvasprintf(&fmt, suffixfmt, args);
va_end(args);
xstrprepend(str, fmt);
}
void secure_clear(void *ptr, size_t len)
{
if (!ptr)
return;
memset(ptr, 0, len);
/* prevent GCC / LLVM from optimizing out memset */
asm volatile("" : : "r"(ptr) : "memory");
}
void secure_clear_str(char *str)
{
if (!str)
return;
secure_clear(str, strlen(str));
}
void *secure_resize(void *ptr, size_t oldlen, size_t newlen)
{
/* open-coded realloc, with a secure memset in the middle */
void *newptr = xmalloc(newlen);
if (ptr) {
memcpy(newptr, ptr, min(oldlen, newlen));
secure_clear(ptr, oldlen);
free(ptr);
}
return newptr;
}
static char hex_digits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
_unroll_ void bytes_to_hex(const unsigned char *bytes, char **hex, size_t len)
{
if (!*hex)
*hex = xmalloc(len * 2 + 1);
for (size_t i = 0; i < len; ++i) {
(*hex)[i * 2] = hex_digits[(bytes[i] >> 4) & 0xF];
(*hex)[i * 2 + 1] = hex_digits[bytes[i] & 0xF];
}
(*hex)[len * 2] = '\0';
}
int hex_to_bytes(const char *hex, unsigned char **bytes)
{
size_t len = strlen(hex);
if (len % 2 != 0) {
if (!*bytes)
*bytes = xcalloc(1, 1);
**bytes = '\0';
return -EINVAL;
}
if (!*bytes)
*bytes = xmalloc(len / 2 + 1);
for (size_t i = 0; i < len / 2; ++i) {
if (sscanf(&hex[i * 2], "%2hhx", (unsigned char *)(*bytes + i)) != 1) {
fprintf(stderr, "%s\n", hex);
**bytes = '\0';
return -EINVAL;
}
}
(*bytes)[len / 2] = '\0';
return 0;
}
/* [min, max) */
unsigned long range_rand(unsigned long min, unsigned long max)
{
unsigned long base_random, range, remainder, bucket;
if (!RAND_bytes((unsigned char *)&base_random, sizeof(base_random)))
die("Could not generate random bytes.");
if (ULONG_MAX == base_random)
return range_rand(min, max);
range = max - min;
remainder = ULONG_MAX % range;
bucket = ULONG_MAX / range;
if (base_random < ULONG_MAX - remainder)
return min + base_random / bucket;
return range_rand(min, max);
}
void get_random_bytes(unsigned char *buf, size_t len)
{
if (!RAND_bytes(buf, len))
die("Could not generate random bytes.");
}
const char *bool_str(bool val)
{
return val ? "1" : "0";
}