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tenfourfox/dom/wifi/WifiUtils.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WifiUtils.h"
#include <dlfcn.h>
#include <errno.h>
#include <cutils/properties.h>
#include "prinit.h"
#include "js/CharacterEncoding.h"
using namespace mozilla::dom;
#define BUFFER_SIZE 4096
#define COMMAND_SIZE 256
// Intentionally not trying to dlclose() this handle. That's playing
// Russian roulette with security bugs.
static void* sWifiLib;
static PRCallOnceType sInitWifiLib;
static PRStatus
InitWifiLib()
{
sWifiLib = dlopen("/system/lib/libhardware_legacy.so", RTLD_LAZY);
// We might fail to open the hardware lib. That's OK.
return PR_SUCCESS;
}
static void*
GetSharedLibrary()
{
PR_CallOnce(&sInitWifiLib, InitWifiLib);
return sWifiLib;
}
static bool
GetWifiP2pSupported()
{
char propP2pSupported[PROPERTY_VALUE_MAX];
property_get("ro.moz.wifi.p2p_supported", propP2pSupported, "0");
return (0 == strcmp(propP2pSupported, "1"));
}
static int
hex2num(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
static int
hex2byte(const char* hex)
{
int a, b;
a = hex2num(*hex++);
if (a < 0)
return -1;
b = hex2num(*hex++);
if (b < 0)
return -1;
return (a << 4) | b;
}
// This function is equivalent to printf_decode() at src/utils/common.c in
// the supplicant.
static uint32_t
convertToBytes(char* buf, uint32_t maxlen, const char* str)
{
const char *pos = str;
uint32_t len = 0;
int val;
while (*pos) {
if (len == maxlen)
break;
switch (*pos) {
case '\\':
pos++;
switch (*pos) {
case '\\':
buf[len++] = '\\';
pos++;
break;
case '"':
buf[len++] = '"';
pos++;
break;
case 'n':
buf[len++] = '\n';
pos++;
break;
case 'r':
buf[len++] = '\r';
pos++;
break;
case 't':
buf[len++] = '\t';
pos++;
break;
case 'e':
buf[len++] = '\e';
pos++;
break;
case 'x':
pos++;
val = hex2byte(pos);
if (val < 0) {
val = hex2num(*pos);
if (val < 0)
break;
buf[len++] = val;
pos++;
} else {
buf[len++] = val;
pos += 2;
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = *pos++ - '0';
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
buf[len++] = val;
break;
default:
break;
}
break;
default:
buf[len++] = *pos++;
break;
}
}
return len;
}
// This is the same algorithm as in InflateUTF8StringToBuffer with Copy and
// while ignoring invalids.
// https://mxr.mozilla.org/mozilla-central/source/js/src/vm/CharacterEncoding.cpp#231
static const uint32_t REPLACE_UTF8 = 0xFFFD;
static void
LossyConvertUTF8toUTF16(const char* aInput, uint32_t aLength, nsAString& aOut)
{
JS::UTF8Chars src(aInput, aLength);
char16_t dst[aLength]; // Allocating for worst case.
// Count how many char16_t characters are needed in the inflated string.
// |i| is the index into |src|, and |j| is the the index into |dst|.
size_t srclen = src.length();
uint32_t j = 0;
for (uint32_t i = 0; i < srclen; i++, j++) {
uint32_t v = uint32_t(src[i]);
if (v == uint32_t('\0') && i < srclen - 1) {
// If the leading byte is '\0' and it's not the last byte,
// just ignore it to prevent from being truncated. This could
// be caused by |convertToBytes| (e.g. \x00 would be converted to '\0')
j--;
continue;
}
if (!(v & 0x80)) {
// ASCII code unit. Simple copy.
dst[j] = char16_t(v);
} else {
// Non-ASCII code unit. Determine its length in bytes (n).
uint32_t n = 1;
while (v & (0x80 >> n))
n++;
#define INVALID(report, arg, n2) \
do { \
n = n2; \
goto invalidMultiByteCodeUnit; \
} while (0)
// Check the leading byte.
if (n < 2 || n > 4)
INVALID(ReportInvalidCharacter, i, 1);
// Check that |src| is large enough to hold an n-byte code unit.
if (i + n > srclen)
INVALID(ReportBufferTooSmall, /* dummy = */ 0, 1);
// Check the second byte. From Unicode Standard v6.2, Table 3-7
// Well-Formed UTF-8 Byte Sequences.
if ((v == 0xE0 && ((uint8_t)src[i + 1] & 0xE0) != 0xA0) || // E0 A0~BF
(v == 0xED && ((uint8_t)src[i + 1] & 0xE0) != 0x80) || // ED 80~9F
(v == 0xF0 && ((uint8_t)src[i + 1] & 0xF0) == 0x80) || // F0 90~BF
(v == 0xF4 && ((uint8_t)src[i + 1] & 0xF0) != 0x80)) // F4 80~8F
{
INVALID(ReportInvalidCharacter, i, 1);
}
// Check the continuation bytes.
for (uint32_t m = 1; m < n; m++)
if ((src[i + m] & 0xC0) != 0x80)
INVALID(ReportInvalidCharacter, i, m);
// Determine the code unit's length in char16_t units and act accordingly.
v = JS::Utf8ToOneUcs4Char((uint8_t *)&src[i], n);
if (v < 0x10000) {
// The n-byte UTF8 code unit will fit in a single char16_t.
dst[j] = char16_t(v);
} else {
v -= 0x10000;
if (v <= 0xFFFFF) {
// The n-byte UTF8 code unit will fit in two char16_t units.
dst[j] = char16_t((v >> 10) + 0xD800);
j++;
dst[j] = char16_t((v & 0x3FF) + 0xDC00);
} else {
// The n-byte UTF8 code unit won't fit in two char16_t units.
INVALID(ReportTooBigCharacter, v, 1);
}
}
invalidMultiByteCodeUnit:
// Move i to the last byte of the multi-byte code unit; the loop
// header will do the final i++ to move to the start of the next
// code unit.
i += n - 1;
}
}
dst[j] = 0;
aOut = dst;
}
// Helper to check we have loaded the hardware shared library.
#define CHECK_HWLIB(ret) \
void* hwLib = GetSharedLibrary(); \
if (!hwLib) { \
NS_WARNING("No /system/lib/libhardware_legacy.so"); \
return ret; \
}
#define DEFAULT_IMPL(name, ret, args...) \
DEFINE_DLFUNC(name, ret, args...) \
ret do_##name(args) { \
USE_DLFUNC(name) \
return name(args); \
}
// ICS implementation.
class ICSWpaSupplicantImpl : public WpaSupplicantImpl
{
public:
DEFAULT_IMPL(wifi_load_driver, int32_t, )
DEFAULT_IMPL(wifi_unload_driver, int32_t, )
DEFINE_DLFUNC(wifi_wait_for_event, int32_t, char*, size_t)
int32_t do_wifi_wait_for_event(const char *iface, char *buf, size_t len) {
USE_DLFUNC(wifi_wait_for_event)
return wifi_wait_for_event(buf, len);
}
DEFINE_DLFUNC(wifi_command, int32_t, const char*, char*, size_t*)
int32_t do_wifi_command(const char* iface, const char* cmd, char* buf, size_t* len) {
USE_DLFUNC(wifi_command)
return wifi_command(cmd, buf, len);
}
DEFINE_DLFUNC(wifi_start_supplicant, int32_t, )
int32_t do_wifi_start_supplicant(int32_t) {
USE_DLFUNC(wifi_start_supplicant)
return wifi_start_supplicant();
}
DEFINE_DLFUNC(wifi_stop_supplicant, int32_t)
int32_t do_wifi_stop_supplicant(int32_t) {
USE_DLFUNC(wifi_stop_supplicant)
return wifi_stop_supplicant();
}
DEFINE_DLFUNC(wifi_connect_to_supplicant, int32_t, )
int32_t do_wifi_connect_to_supplicant(const char* iface) {
USE_DLFUNC(wifi_connect_to_supplicant)
return wifi_connect_to_supplicant();
}
DEFINE_DLFUNC(wifi_close_supplicant_connection, void, )
void do_wifi_close_supplicant_connection(const char* iface) {
USE_DLFUNC(wifi_close_supplicant_connection)
return wifi_close_supplicant_connection();
}
};
// JB implementation.
// We only redefine the methods that have a different signature than on ICS.
class JBWpaSupplicantImpl : public ICSWpaSupplicantImpl
{
public:
DEFINE_DLFUNC(wifi_wait_for_event, int32_t, const char*, char*, size_t)
int32_t do_wifi_wait_for_event(const char* iface, char* buf, size_t len) {
USE_DLFUNC(wifi_wait_for_event)
return wifi_wait_for_event(iface, buf, len);
}
DEFINE_DLFUNC(wifi_command, int32_t, const char*, const char*, char*, size_t*)
int32_t do_wifi_command(const char* iface, const char* cmd, char* buf, size_t* len) {
USE_DLFUNC(wifi_command)
return wifi_command(iface, cmd, buf, len);
}
DEFINE_DLFUNC(wifi_start_supplicant, int32_t, int32_t)
int32_t do_wifi_start_supplicant(int32_t arg) {
USE_DLFUNC(wifi_start_supplicant)
return wifi_start_supplicant(arg);
}
DEFINE_DLFUNC(wifi_stop_supplicant, int32_t, int32_t)
int32_t do_wifi_stop_supplicant(int32_t arg) {
USE_DLFUNC(wifi_stop_supplicant)
return wifi_stop_supplicant(arg);
}
DEFINE_DLFUNC(wifi_connect_to_supplicant, int32_t, const char*)
int32_t do_wifi_connect_to_supplicant(const char* iface) {
USE_DLFUNC(wifi_connect_to_supplicant)
return wifi_connect_to_supplicant(iface);
}
DEFINE_DLFUNC(wifi_close_supplicant_connection, void, const char*)
void do_wifi_close_supplicant_connection(const char* iface) {
USE_DLFUNC(wifi_close_supplicant_connection)
wifi_close_supplicant_connection(iface);
}
};
// KK implementation.
// We only redefine the methods that have a different signature than on ICS.
class KKWpaSupplicantImpl : public ICSWpaSupplicantImpl
{
public:
DEFINE_DLFUNC(wifi_start_supplicant, int32_t, int32_t)
int32_t do_wifi_start_supplicant(int32_t arg) {
USE_DLFUNC(wifi_start_supplicant)
return wifi_start_supplicant(arg);
}
DEFINE_DLFUNC(wifi_stop_supplicant, int32_t, int32_t)
int32_t do_wifi_stop_supplicant(int32_t arg) {
USE_DLFUNC(wifi_stop_supplicant)
return wifi_stop_supplicant(arg);
}
DEFINE_DLFUNC(wifi_command, int32_t, const char*, char*, size_t*)
int32_t do_wifi_command(const char* iface, const char* cmd, char* buf, size_t* len) {
char command[COMMAND_SIZE];
if (!strcmp(iface, "p2p0")) {
// Commands for p2p0 interface don't need prefix
PR_snprintf(command, COMMAND_SIZE, "%s", cmd);
}
else {
PR_snprintf(command, COMMAND_SIZE, "IFNAME=%s %s", iface, cmd);
}
USE_DLFUNC(wifi_command)
return wifi_command(command, buf, len);
}
};
// Concrete class to use to access the wpa supplicant.
WpaSupplicant::WpaSupplicant()
{
char propVersion[PROPERTY_VALUE_MAX];
property_get("ro.build.version.sdk", propVersion, "0");
mSdkVersion = strtol(propVersion, nullptr, 10);
if (mSdkVersion < 16) {
mImpl = new ICSWpaSupplicantImpl();
} else if (mSdkVersion < 19) {
mImpl = new JBWpaSupplicantImpl();
} else {
mImpl = new KKWpaSupplicantImpl();
}
mWifiHotspotUtils = new WifiHotspotUtils();
};
void WpaSupplicant::WaitForEvent(nsAString& aEvent, const nsCString& aInterface)
{
CHECK_HWLIB()
char buffer[BUFFER_SIZE];
int32_t ret = mImpl->do_wifi_wait_for_event(aInterface.get(), buffer, BUFFER_SIZE);
CheckBuffer(buffer, ret, aEvent);
}
#define GET_CHAR(prop) NS_ConvertUTF16toUTF8(aOptions.prop).get()
/**
* Make a subnet mask.
*/
uint32_t WpaSupplicant::MakeMask(uint32_t len) {
uint32_t mask = 0;
for (uint32_t i = 0; i < len; ++i) {
mask |= (0x80000000 >> i);
}
return ntohl(mask);
}
bool WpaSupplicant::ExecuteCommand(CommandOptions aOptions,
WifiResultOptions& aResult,
const nsCString& aInterface)
{
CHECK_HWLIB(false)
if (!mWifiHotspotUtils->GetSharedLibrary()) {
return false;
}
// Always correlate the opaque ids.
aResult.mId = aOptions.mId;
if (aOptions.mCmd.EqualsLiteral("command")) {
size_t len = BUFFER_SIZE - 1;
char buffer[BUFFER_SIZE];
NS_ConvertUTF16toUTF8 request(aOptions.mRequest);
aResult.mStatus = mImpl->do_wifi_command(aInterface.get(), request.get(), buffer, &len);
nsString value;
if (aResult.mStatus == 0) {
if (buffer[len - 1] == '\n') { // remove trailing new lines.
len--;
}
buffer[len] = '\0';
CheckBuffer(buffer, len, value);
}
aResult.mReply = value;
} else if (aOptions.mCmd.EqualsLiteral("close_supplicant_connection")) {
mImpl->do_wifi_close_supplicant_connection(aInterface.get());
} else if (aOptions.mCmd.EqualsLiteral("load_driver")) {
aResult.mStatus = mImpl->do_wifi_load_driver();
} else if (aOptions.mCmd.EqualsLiteral("unload_driver")) {
aResult.mStatus = mImpl->do_wifi_unload_driver();
} else if (aOptions.mCmd.EqualsLiteral("start_supplicant")) {
aResult.mStatus = mImpl->do_wifi_start_supplicant(GetWifiP2pSupported() ? 1 : 0);
} else if (aOptions.mCmd.EqualsLiteral("stop_supplicant")) {
aResult.mStatus = mImpl->do_wifi_stop_supplicant(0);
} else if (aOptions.mCmd.EqualsLiteral("connect_to_supplicant")) {
aResult.mStatus = mImpl->do_wifi_connect_to_supplicant(aInterface.get());
} else if (aOptions.mCmd.EqualsLiteral("hostapd_command")) {
size_t len = BUFFER_SIZE - 1;
char buffer[BUFFER_SIZE];
NS_ConvertUTF16toUTF8 request(aOptions.mRequest);
aResult.mStatus = mWifiHotspotUtils->do_wifi_hostapd_command(request.get(),
buffer,
&len);
nsString value;
if (aResult.mStatus == 0) {
if (buffer[len - 1] == '\n') { // remove trailing new lines.
len--;
}
buffer[len] = '\0';
CheckBuffer(buffer, len, value);
}
aResult.mReply = value;
} else if (aOptions.mCmd.EqualsLiteral("hostapd_get_stations")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_hostapd_get_stations();
} else if (aOptions.mCmd.EqualsLiteral("connect_to_hostapd")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_connect_to_hostapd();
} else if (aOptions.mCmd.EqualsLiteral("close_hostapd_connection")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_close_hostapd_connection();
} else if (aOptions.mCmd.EqualsLiteral("hostapd_command")) {
size_t len = BUFFER_SIZE - 1;
char buffer[BUFFER_SIZE];
NS_ConvertUTF16toUTF8 request(aOptions.mRequest);
aResult.mStatus = mWifiHotspotUtils->do_wifi_hostapd_command(request.get(),
buffer,
&len);
nsString value;
if (aResult.mStatus == 0) {
if (buffer[len - 1] == '\n') { // remove trailing new lines.
len--;
}
buffer[len] = '\0';
CheckBuffer(buffer, len, value);
}
aResult.mReply = value;
} else if (aOptions.mCmd.EqualsLiteral("hostapd_get_stations")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_hostapd_get_stations();
} else if (aOptions.mCmd.EqualsLiteral("connect_to_hostapd")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_connect_to_hostapd();
} else if (aOptions.mCmd.EqualsLiteral("close_hostapd_connection")) {
aResult.mStatus = mWifiHotspotUtils->do_wifi_close_hostapd_connection();
} else {
NS_WARNING("WpaSupplicant::ExecuteCommand : Unknown command");
printf_stderr("WpaSupplicant::ExecuteCommand : Unknown command: %s",
NS_ConvertUTF16toUTF8(aOptions.mCmd).get());
return false;
}
return true;
}
// Checks the buffer and do the utf processing.
void
WpaSupplicant::CheckBuffer(char* buffer, int32_t length,
nsAString& aEvent)
{
if (length <= 0 || length >= (BUFFER_SIZE - 1)) {
NS_WARNING("WpaSupplicant::CheckBuffer: Invalid buffer length");
return;
}
if (mSdkVersion < 18) {
buffer[length] = 0;
LossyConvertUTF8toUTF16(buffer, length, aEvent);
return;
}
// After Android JB4.3, the SSIDs have been converted into printable form.
// In most of cases, SSIDs do not use unprintable characters, but IEEE 802.11
// standard does not limit the used character set, so anything could be used
// in an SSID. Convert it to raw data form here.
char bytesBuffer[BUFFER_SIZE];
uint32_t bytes = convertToBytes(bytesBuffer, length, buffer);
if (bytes <= 0 || bytes >= BUFFER_SIZE) {
NS_WARNING("WpaSupplicant::CheckBuffer: Invalid bytesbuffer length");
return;
}
bytesBuffer[bytes] = 0;
LossyConvertUTF8toUTF16(bytesBuffer, bytes, aEvent);
}
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