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-rw-r--r--dom/wifi/WifiUtils.cpp521
1 files changed, 521 insertions, 0 deletions
diff --git a/dom/wifi/WifiUtils.cpp b/dom/wifi/WifiUtils.cpp
new file mode 100644
index 000000000..2526c9ea4
--- /dev/null
+++ b/dom/wifi/WifiUtils.cpp
@@ -0,0 +1,521 @@
+/* -*- 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 "mozilla/Sprintf.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
+ SprintfLiteral(command, "%s", cmd);
+ }
+ else {
+ SprintfLiteral(command, "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 = MakeUnique<ICSWpaSupplicantImpl>();
+ } else if (mSdkVersion < 19) {
+ mImpl = MakeUnique<JBWpaSupplicantImpl>();
+ } else {
+ mImpl = MakeUnique<KKWpaSupplicantImpl>();
+ }
+ mWifiHotspotUtils = MakeUnique<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 {
+ 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 22:21:15 +0000