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/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2018, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file compat.c
* \brief Wrappers to make calls more portable. This code defines
* functions such as tor_snprintf, get/set various data types,
* renaming, setting socket options, switching user IDs. It is basically
* where the non-portable items are conditionally included depending on
* the platform.
**/
#define COMPAT_PRIVATE
#include "common/compat.h"
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#include <sys/locking.h>
#endif
#ifdef HAVE_UNAME
#include <sys/utsname.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_FCNTL_H
#include <sys/fcntl.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
#ifdef _WIN32
#include <conio.h>
#include <wchar.h>
/* Some mingw headers lack these. :p */
#if defined(HAVE_DECL__GETWCH) && !HAVE_DECL__GETWCH
wint_t _getwch(void);
#endif
#ifndef WEOF
#define WEOF (wchar_t)(0xFFFF)
#endif
#if defined(HAVE_DECL_SECUREZEROMEMORY) && !HAVE_DECL_SECUREZEROMEMORY
static inline void
SecureZeroMemory(PVOID ptr, SIZE_T cnt)
{
volatile char *vcptr = (volatile char*)ptr;
while (cnt--)
*vcptr++ = 0;
}
#endif /* defined(HAVE_DECL_SECUREZEROMEMORY) && !HAVE_DECL_SECUREZEROMEMORY */
#elif defined(HAVE_READPASSPHRASE_H)
#include <readpassphrase.h>
#else
#include "tor_readpassphrase.h"
#endif /* defined(_WIN32) || ... */
/* Includes for the process attaching prevention */
#if defined(HAVE_SYS_PRCTL_H) && defined(__linux__)
/* Only use the linux prctl; the IRIX prctl is totally different */
#include <sys/prctl.h>
#elif defined(__APPLE__)
#include <sys/ptrace.h>
#endif /* defined(HAVE_SYS_PRCTL_H) && defined(__linux__) || ... */
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h> /* FreeBSD needs this to know what version it is */
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_MMAP
#include <sys/mman.h>
#endif
#ifdef HAVE_SYS_SYSLIMITS_H
#include <sys/syslimits.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include "lib/log/torlog.h"
#include "common/util.h"
#include "lib/container/smartlist.h"
#include "lib/wallclock/tm_cvt.h"
#include "lib/net/address.h"
#include "lib/sandbox/sandbox.h"
/** Hold the result of our call to <b>uname</b>. */
static char uname_result[256];
/** True iff uname_result is set. */
static int uname_result_is_set = 0;
/** Return a pointer to a description of our platform.
*/
MOCK_IMPL(const char *,
get_uname,(void))
{
#ifdef HAVE_UNAME
struct utsname u;
#endif
if (!uname_result_is_set) {
#ifdef HAVE_UNAME
if (uname(&u) != -1) {
/* (Linux says 0 is success, Solaris says 1 is success) */
strlcpy(uname_result, u.sysname, sizeof(uname_result));
} else
#endif /* defined(HAVE_UNAME) */
{
#ifdef _WIN32
OSVERSIONINFOEX info;
int i;
const char *plat = NULL;
static struct {
unsigned major; unsigned minor; const char *version;
} win_version_table[] = {
{ 6, 2, "Windows 8" },
{ 6, 1, "Windows 7" },
{ 6, 0, "Windows Vista" },
{ 5, 2, "Windows Server 2003" },
{ 5, 1, "Windows XP" },
{ 5, 0, "Windows 2000" },
/* { 4, 0, "Windows NT 4.0" }, */
{ 4, 90, "Windows Me" },
{ 4, 10, "Windows 98" },
/* { 4, 0, "Windows 95" } */
{ 3, 51, "Windows NT 3.51" },
{ 0, 0, NULL }
};
memset(&info, 0, sizeof(info));
info.dwOSVersionInfoSize = sizeof(info);
if (! GetVersionEx((LPOSVERSIONINFO)&info)) {
strlcpy(uname_result, "Bizarre version of Windows where GetVersionEx"
" doesn't work.", sizeof(uname_result));
uname_result_is_set = 1;
return uname_result;
}
if (info.dwMajorVersion == 4 && info.dwMinorVersion == 0) {
if (info.dwPlatformId == VER_PLATFORM_WIN32_NT)
plat = "Windows NT 4.0";
else
plat = "Windows 95";
} else {
for (i=0; win_version_table[i].major>0; ++i) {
if (win_version_table[i].major == info.dwMajorVersion &&
win_version_table[i].minor == info.dwMinorVersion) {
plat = win_version_table[i].version;
break;
}
}
}
if (plat) {
strlcpy(uname_result, plat, sizeof(uname_result));
} else {
if (info.dwMajorVersion > 6 ||
(info.dwMajorVersion==6 && info.dwMinorVersion>2))
tor_snprintf(uname_result, sizeof(uname_result),
"Very recent version of Windows [major=%d,minor=%d]",
(int)info.dwMajorVersion,(int)info.dwMinorVersion);
else
tor_snprintf(uname_result, sizeof(uname_result),
"Unrecognized version of Windows [major=%d,minor=%d]",
(int)info.dwMajorVersion,(int)info.dwMinorVersion);
}
#ifdef VER_NT_SERVER
if (info.wProductType == VER_NT_SERVER ||
info.wProductType == VER_NT_DOMAIN_CONTROLLER) {
strlcat(uname_result, " [server]", sizeof(uname_result));
}
#endif /* defined(VER_NT_SERVER) */
#else /* !(defined(_WIN32)) */
/* LCOV_EXCL_START -- can't provoke uname failure */
strlcpy(uname_result, "Unknown platform", sizeof(uname_result));
/* LCOV_EXCL_STOP */
#endif /* defined(_WIN32) */
}
uname_result_is_set = 1;
}
return uname_result;
}
/*
* Process control
*/
/** Emit the password prompt <b>prompt</b>, then read up to <b>buflen</b>
* bytes of passphrase into <b>output</b>. Return the number of bytes in
* the passphrase, excluding terminating NUL.
*/
ssize_t
tor_getpass(const char *prompt, char *output, size_t buflen)
{
tor_assert(buflen <= SSIZE_MAX);
tor_assert(buflen >= 1);
#if defined(HAVE_READPASSPHRASE)
char *pwd = readpassphrase(prompt, output, buflen, RPP_ECHO_OFF);
if (pwd == NULL)
return -1;
return strlen(pwd);
#elif defined(_WIN32)
int r = -1;
while (*prompt) {
_putch(*prompt++);
}
tor_assert(buflen <= INT_MAX);
wchar_t *buf = tor_calloc(buflen, sizeof(wchar_t));
wchar_t *ptr = buf, *lastch = buf + buflen - 1;
while (ptr < lastch) {
wint_t ch = _getwch();
switch (ch) {
case '\r':
case '\n':
case WEOF:
goto done_reading;
case 3:
goto done; /* Can't actually read ctrl-c this way. */
case '\b':
if (ptr > buf)
--ptr;
continue;
case 0:
case 0xe0:
ch = _getwch(); /* Ignore; this is a function or arrow key */
break;
default:
*ptr++ = ch;
break;
}
}
done_reading:
;
#ifndef WC_ERR_INVALID_CHARS
#define WC_ERR_INVALID_CHARS 0x80
#endif
/* Now convert it to UTF-8 */
r = WideCharToMultiByte(CP_UTF8,
WC_NO_BEST_FIT_CHARS|WC_ERR_INVALID_CHARS,
buf, (int)(ptr-buf),
output, (int)(buflen-1),
NULL, NULL);
if (r <= 0) {
r = -1;
goto done;
}
tor_assert(r < (int)buflen);
output[r] = 0;
done:
SecureZeroMemory(buf, sizeof(wchar_t)*buflen);
tor_free(buf);
return r;
#else
#error "No implementation for tor_getpass found!"
#endif /* defined(HAVE_READPASSPHRASE) || ... */
}
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