| /* |
| * Copyright 2008, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "NetUtils" |
| |
| #include "jni.h" |
| #include "JNIHelp.h" |
| #include "NetdClient.h" |
| #include <utils/misc.h> |
| #include <android_runtime/AndroidRuntime.h> |
| #include <utils/Log.h> |
| #include <arpa/inet.h> |
| #include <net/if.h> |
| #include <linux/filter.h> |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_packet.h> |
| #include <net/if_ether.h> |
| #include <netinet/ip.h> |
| #include <netinet/udp.h> |
| #include <cutils/properties.h> |
| |
| #include "core_jni_helpers.h" |
| |
| extern "C" { |
| int ifc_enable(const char *ifname); |
| int ifc_disable(const char *ifname); |
| int ifc_reset_connections(const char *ifname, int reset_mask); |
| |
| int dhcp_start(const char * const ifname); |
| int dhcp_start_renew(const char * const ifname); |
| int dhcp_get_results(const char * const ifname, |
| const char *ipaddr, |
| const char *gateway, |
| uint32_t *prefixLength, |
| const char *dns[], |
| const char *server, |
| uint32_t *lease, |
| const char *vendorInfo, |
| const char *domains, |
| const char *mtu); |
| |
| int dhcp_stop(const char *ifname); |
| int dhcp_release_lease(const char *ifname); |
| char *dhcp_get_errmsg(); |
| } |
| |
| #define NETUTILS_PKG_NAME "android/net/NetworkUtils" |
| |
| namespace android { |
| |
| static const uint16_t kDhcpClientPort = 68; |
| |
| /* |
| * The following remembers the jfieldID's of the fields |
| * of the DhcpInfo Java object, so that we don't have |
| * to look them up every time. |
| */ |
| static struct fieldIds { |
| jmethodID clear; |
| jmethodID setIpAddress; |
| jmethodID setGateway; |
| jmethodID addDns; |
| jmethodID setDomains; |
| jmethodID setServerAddress; |
| jmethodID setLeaseDuration; |
| jmethodID setVendorInfo; |
| } dhcpResultsFieldIds; |
| |
| static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, |
| jstring ifname, jint mask) |
| { |
| int result; |
| |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| |
| ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n", |
| env, clazz, nameStr, mask); |
| |
| result = ::ifc_reset_connections(nameStr, mask); |
| env->ReleaseStringUTFChars(ifname, nameStr); |
| return (jint)result; |
| } |
| |
| static jboolean android_net_utils_getDhcpResults(JNIEnv* env, jobject clazz, jstring ifname, |
| jobject dhcpResults) |
| { |
| int result; |
| char ipaddr[PROPERTY_VALUE_MAX]; |
| uint32_t prefixLength; |
| char gateway[PROPERTY_VALUE_MAX]; |
| char dns1[PROPERTY_VALUE_MAX]; |
| char dns2[PROPERTY_VALUE_MAX]; |
| char dns3[PROPERTY_VALUE_MAX]; |
| char dns4[PROPERTY_VALUE_MAX]; |
| const char *dns[5] = {dns1, dns2, dns3, dns4, NULL}; |
| char server[PROPERTY_VALUE_MAX]; |
| uint32_t lease; |
| char vendorInfo[PROPERTY_VALUE_MAX]; |
| char domains[PROPERTY_VALUE_MAX]; |
| char mtu[PROPERTY_VALUE_MAX]; |
| |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| if (nameStr == NULL) return (jboolean)false; |
| |
| result = ::dhcp_get_results(nameStr, ipaddr, gateway, &prefixLength, |
| dns, server, &lease, vendorInfo, domains, mtu); |
| if (result != 0) { |
| ALOGD("dhcp_get_results failed : %s (%s)", nameStr, ::dhcp_get_errmsg()); |
| } |
| |
| env->ReleaseStringUTFChars(ifname, nameStr); |
| if (result == 0) { |
| env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.clear); |
| |
| // set the linkAddress |
| // dhcpResults->addLinkAddress(inetAddress, prefixLength) |
| result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setIpAddress, |
| env->NewStringUTF(ipaddr), prefixLength); |
| } |
| |
| if (result == 0) { |
| // set the gateway |
| result = env->CallBooleanMethod(dhcpResults, |
| dhcpResultsFieldIds.setGateway, env->NewStringUTF(gateway)); |
| } |
| |
| if (result == 0) { |
| // dhcpResults->addDns(new InetAddress(dns1)) |
| result = env->CallBooleanMethod(dhcpResults, |
| dhcpResultsFieldIds.addDns, env->NewStringUTF(dns1)); |
| } |
| |
| if (result == 0) { |
| env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setDomains, |
| env->NewStringUTF(domains)); |
| |
| result = env->CallBooleanMethod(dhcpResults, |
| dhcpResultsFieldIds.addDns, env->NewStringUTF(dns2)); |
| |
| if (result == 0) { |
| result = env->CallBooleanMethod(dhcpResults, |
| dhcpResultsFieldIds.addDns, env->NewStringUTF(dns3)); |
| if (result == 0) { |
| result = env->CallBooleanMethod(dhcpResults, |
| dhcpResultsFieldIds.addDns, env->NewStringUTF(dns4)); |
| } |
| } |
| } |
| |
| if (result == 0) { |
| // dhcpResults->setServerAddress(new InetAddress(server)) |
| result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setServerAddress, |
| env->NewStringUTF(server)); |
| } |
| |
| if (result == 0) { |
| // dhcpResults->setLeaseDuration(lease) |
| env->CallVoidMethod(dhcpResults, |
| dhcpResultsFieldIds.setLeaseDuration, lease); |
| |
| // dhcpResults->setVendorInfo(vendorInfo) |
| env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setVendorInfo, |
| env->NewStringUTF(vendorInfo)); |
| } |
| return (jboolean)(result == 0); |
| } |
| |
| static jboolean android_net_utils_startDhcp(JNIEnv* env, jobject clazz, jstring ifname) |
| { |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| if (nameStr == NULL) return (jboolean)false; |
| if (::dhcp_start(nameStr) != 0) { |
| ALOGD("dhcp_start failed : %s", nameStr); |
| return (jboolean)false; |
| } |
| return (jboolean)true; |
| } |
| |
| static jboolean android_net_utils_startDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname) |
| { |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| if (nameStr == NULL) return (jboolean)false; |
| if (::dhcp_start_renew(nameStr) != 0) { |
| ALOGD("dhcp_start_renew failed : %s", nameStr); |
| return (jboolean)false; |
| } |
| return (jboolean)true; |
| } |
| |
| static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname) |
| { |
| int result; |
| |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| result = ::dhcp_stop(nameStr); |
| env->ReleaseStringUTFChars(ifname, nameStr); |
| return (jboolean)(result == 0); |
| } |
| |
| static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname) |
| { |
| int result; |
| |
| const char *nameStr = env->GetStringUTFChars(ifname, NULL); |
| result = ::dhcp_release_lease(nameStr); |
| env->ReleaseStringUTFChars(ifname, nameStr); |
| return (jboolean)(result == 0); |
| } |
| |
| static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz) |
| { |
| return env->NewStringUTF(::dhcp_get_errmsg()); |
| } |
| |
| static void android_net_utils_attachDhcpFilter(JNIEnv *env, jobject clazz, jobject javaFd) |
| { |
| int fd = jniGetFDFromFileDescriptor(env, javaFd); |
| uint32_t ip_offset = sizeof(ether_header); |
| uint32_t proto_offset = ip_offset + offsetof(iphdr, protocol); |
| uint32_t flags_offset = ip_offset + offsetof(iphdr, frag_off); |
| uint32_t dport_indirect_offset = ip_offset + offsetof(udphdr, dest); |
| struct sock_filter filter_code[] = { |
| // Check the protocol is UDP. |
| BPF_STMT(BPF_LD | BPF_B | BPF_ABS, proto_offset), |
| BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, IPPROTO_UDP, 0, 6), |
| |
| // Check this is not a fragment. |
| BPF_STMT(BPF_LD | BPF_H | BPF_ABS, flags_offset), |
| BPF_JUMP(BPF_JMP | BPF_JSET | BPF_K, 0x1fff, 4, 0), |
| |
| // Get the IP header length. |
| BPF_STMT(BPF_LDX | BPF_B | BPF_MSH, ip_offset), |
| |
| // Check the destination port. |
| BPF_STMT(BPF_LD | BPF_H | BPF_IND, dport_indirect_offset), |
| BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, kDhcpClientPort, 0, 1), |
| |
| // Accept or reject. |
| BPF_STMT(BPF_RET | BPF_K, 0xffff), |
| BPF_STMT(BPF_RET | BPF_K, 0) |
| }; |
| struct sock_fprog filter = { |
| sizeof(filter_code) / sizeof(filter_code[0]), |
| filter_code, |
| }; |
| |
| if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) != 0) { |
| jniThrowExceptionFmt(env, "java/net/SocketException", |
| "setsockopt(SO_ATTACH_FILTER): %s", strerror(errno)); |
| } |
| } |
| |
| static jboolean android_net_utils_bindProcessToNetwork(JNIEnv *env, jobject thiz, jint netId) |
| { |
| return (jboolean) !setNetworkForProcess(netId); |
| } |
| |
| static jint android_net_utils_getBoundNetworkForProcess(JNIEnv *env, jobject thiz) |
| { |
| return getNetworkForProcess(); |
| } |
| |
| static jboolean android_net_utils_bindProcessToNetworkForHostResolution(JNIEnv *env, jobject thiz, |
| jint netId) |
| { |
| return (jboolean) !setNetworkForResolv(netId); |
| } |
| |
| static jint android_net_utils_bindSocketToNetwork(JNIEnv *env, jobject thiz, jint socket, |
| jint netId) |
| { |
| return setNetworkForSocket(netId, socket); |
| } |
| |
| static jboolean android_net_utils_protectFromVpn(JNIEnv *env, jobject thiz, jint socket) |
| { |
| return (jboolean) !protectFromVpn(socket); |
| } |
| |
| static jboolean android_net_utils_queryUserAccess(JNIEnv *env, jobject thiz, jint uid, jint netId) |
| { |
| return (jboolean) !queryUserAccess(uid, netId); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| |
| /* |
| * JNI registration. |
| */ |
| static JNINativeMethod gNetworkUtilMethods[] = { |
| /* name, signature, funcPtr */ |
| { "resetConnections", "(Ljava/lang/String;I)I", (void *)android_net_utils_resetConnections }, |
| { "startDhcp", "(Ljava/lang/String;)Z", (void *)android_net_utils_startDhcp }, |
| { "startDhcpRenew", "(Ljava/lang/String;)Z", (void *)android_net_utils_startDhcpRenew }, |
| { "getDhcpResults", "(Ljava/lang/String;Landroid/net/DhcpResults;)Z", (void *)android_net_utils_getDhcpResults }, |
| { "stopDhcp", "(Ljava/lang/String;)Z", (void *)android_net_utils_stopDhcp }, |
| { "releaseDhcpLease", "(Ljava/lang/String;)Z", (void *)android_net_utils_releaseDhcpLease }, |
| { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError }, |
| { "bindProcessToNetwork", "(I)Z", (void*) android_net_utils_bindProcessToNetwork }, |
| { "getBoundNetworkForProcess", "()I", (void*) android_net_utils_getBoundNetworkForProcess }, |
| { "bindProcessToNetworkForHostResolution", "(I)Z", (void*) android_net_utils_bindProcessToNetworkForHostResolution }, |
| { "bindSocketToNetwork", "(II)I", (void*) android_net_utils_bindSocketToNetwork }, |
| { "protectFromVpn", "(I)Z", (void*)android_net_utils_protectFromVpn }, |
| { "queryUserAccess", "(II)Z", (void*)android_net_utils_queryUserAccess }, |
| { "attachDhcpFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDhcpFilter }, |
| }; |
| |
| int register_android_net_NetworkUtils(JNIEnv* env) |
| { |
| jclass dhcpResultsClass = FindClassOrDie(env, "android/net/DhcpResults"); |
| |
| dhcpResultsFieldIds.clear = GetMethodIDOrDie(env, dhcpResultsClass, "clear", "()V"); |
| dhcpResultsFieldIds.setIpAddress =GetMethodIDOrDie(env, dhcpResultsClass, "setIpAddress", |
| "(Ljava/lang/String;I)Z"); |
| dhcpResultsFieldIds.setGateway = GetMethodIDOrDie(env, dhcpResultsClass, "setGateway", |
| "(Ljava/lang/String;)Z"); |
| dhcpResultsFieldIds.addDns = GetMethodIDOrDie(env, dhcpResultsClass, "addDns", |
| "(Ljava/lang/String;)Z"); |
| dhcpResultsFieldIds.setDomains = GetMethodIDOrDie(env, dhcpResultsClass, "setDomains", |
| "(Ljava/lang/String;)V"); |
| dhcpResultsFieldIds.setServerAddress = GetMethodIDOrDie(env, dhcpResultsClass, |
| "setServerAddress", "(Ljava/lang/String;)Z"); |
| dhcpResultsFieldIds.setLeaseDuration = GetMethodIDOrDie(env, dhcpResultsClass, |
| "setLeaseDuration", "(I)V"); |
| dhcpResultsFieldIds.setVendorInfo = GetMethodIDOrDie(env, dhcpResultsClass, "setVendorInfo", |
| "(Ljava/lang/String;)V"); |
| |
| return RegisterMethodsOrDie(env, NETUTILS_PKG_NAME, gNetworkUtilMethods, |
| NELEM(gNetworkUtilMethods)); |
| } |
| |
| }; // namespace android |