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/*
* utils.c
* ptunnel is licensed under the BSD license:
*
* Copyright (c) 2004-2011, Daniel Stoedle <daniels@cs.uit.no>,
* Yellow Lemon Software. All rights reserved.
*
* Copyright (c) 2017-2019, Toni Uhlig <matzeton@googlemail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of the Yellow Lemon Software nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Contacting the author:
* You can get in touch with me, Daniel Stødle (that's the Norwegian letter oe,
* in case your text editor didn't realize), here: <daniels@cs.uit.no>
*
* The official ptunnel website is here:
* <http://www.cs.uit.no/~daniels/PingTunnel/>
*
* Note that the source code is best viewed with tabs set to 4 spaces.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_BSD_STDLIB_H
#include <bsd/stdlib.h>
#endif
#ifndef WIN32
#include <errno.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#else
#include <ws2tcpip.h>
#endif
#include <sys/time.h>
#include "utils.h"
#include "options.h"
void pt_log(int level, const char *fmt, ...) {
va_list args;
const char *header[] = { "[err]: ",
"[inf]: ",
"[evt]: ",
"[vbs]: ",
"[dbg]: ",
"[xfr]: " };
#ifndef WIN32
int syslog_levels[] = {LOG_ERR, LOG_NOTICE, LOG_NOTICE, LOG_INFO, LOG_DEBUG, LOG_DEBUG};
#endif /* !WIN32 */
if (level <= opts.log_level) {
va_start(args, fmt);
#ifndef WIN32
if (opts.use_syslog) {
char log[255];
int header_len;
header_len = snprintf(log,sizeof(log),"%s",header[level]);
vsnprintf(log+header_len,sizeof(log)-header_len,fmt,args);
syslog(syslog_levels[level], "%s", log);
}
else
#endif /* !WIN32 */
fprintf(opts.log_file, "%s", header[level]), vfprintf(opts.log_file, fmt, args);
va_end(args);
#ifndef WIN32
if (opts.log_file != stdout && !opts.use_syslog)
#else
if (opts.log_file != stdout)
#endif
fflush(opts.log_file);
}
}
double time_as_double(void) {
double result;
struct timeval tt;
gettimeofday(&tt, 0);
result = (double)tt.tv_sec + ((double)tt.tv_usec / (double)10e5);
return result;
}
int host_to_addr(const char *hostname, uint32_t *result)
{
int ret;
struct addrinfo *addrs = NULL;
struct addrinfo hints;
struct sockaddr_in *addr;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
if ((ret = getaddrinfo(hostname, NULL, &hints, &addrs)) != 0)
return ret;
addr = (struct sockaddr_in *) addrs->ai_addr;
*result = *(uint32_t *) &addr->sin_addr;
freeaddrinfo(addrs);
return 0;
}
#if 0
static const char hextab[] = "0123456789ABCDEF";
void print_hexstr(unsigned char *buf, size_t siz) {
char *out = (char *) calloc(3, siz+1);
unsigned char high, low;
for (size_t i = 0; i < siz; ++i) {
high = (buf[i] & 0xF0) >> 4;
low = buf[i] & 0x0F;
out[i ] = hextab[high];
out[i+1] = hextab[low];
out[i+2] = ' ';
}
printf("%s\n", out);
free(out);
}
#endif
int pt_random(void) {
#if defined(HAVE_ARC4RANDOM) || defined(__COVERITY__)
return arc4random();
#else
#if defined(RNGDEV) && !defined(_WIN32)
static int rng_fd = -1;
ssize_t bytes_read;
int rnd_val;
if (rng_fd < 0) {
rng_fd = open(RNGDEV, O_RDONLY);
if (rng_fd < 0) {
pt_log(kLog_error, "FATAL: Could not open random device '%s': %s\n",
RNGDEV, strerror(errno));
exit(EXIT_FAILURE);
}
}
bytes_read = read(rng_fd, &rnd_val, sizeof rnd_val);
if (bytes_read != sizeof rnd_val) {
if (bytes_read < 0)
pt_log(kLog_error, "FATAL: Read from random device failed: %s\n",
strerror(errno));
else
pt_log(kLog_error, "FATAL: Read only %zd bytes (wanted %zd bytes)\n",
bytes_read, sizeof rnd_val);
exit(EXIT_FAILURE);
}
return rnd_val;
#else
srand(time(0));
return rand();
#endif
#endif
}
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