diff options
| -rw-r--r-- | android/Android.mk | 25 | ||||
| -rw-r--r-- | android/ip-up-vpn.c | 89 |
2 files changed, 114 insertions, 0 deletions
diff --git a/android/Android.mk b/android/Android.mk new file mode 100644 index 0000000..25c4c58 --- /dev/null +++ b/android/Android.mk @@ -0,0 +1,25 @@ +# +# Copyright (C) 2009 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. +# + +LOCAL_PATH := $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := ip-up-vpn.c +LOCAL_SHARED_LIBRARIES := libcutils +LOCAL_MODULE := ip-up-vpn +LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/ppp + +include $(BUILD_EXECUTABLE) diff --git a/android/ip-up-vpn.c b/android/ip-up-vpn.c new file mode 100644 index 0000000..afc85f4 --- /dev/null +++ b/android/ip-up-vpn.c @@ -0,0 +1,89 @@ +/* + * Copyright (C) 2009 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. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <linux/route.h> + +#include <android/log.h> +#include <cutils/properties.h> + +static inline struct in_addr *in_addr(struct sockaddr *sa) +{ + return &((struct sockaddr_in *)sa)->sin_addr; +} + +int main(int argc, char **argv) +{ + struct rtentry route = { + .rt_dst = {.sa_family = AF_INET}, + .rt_genmask = {.sa_family = AF_INET}, + .rt_gateway = {.sa_family = AF_INET}, + .rt_flags = RTF_UP | RTF_GATEWAY, + }; + FILE *f; + int s; + + errno = EINVAL; + if (argc > 5 && inet_aton(argv[5], in_addr(&route.rt_gateway)) && + (f = fopen("/proc/net/route", "r")) != NULL && + (s = socket(AF_INET, SOCK_DGRAM, 0)) != -1) { + uint32_t *address = &in_addr(&route.rt_dst)->s_addr; + uint32_t *netmask = &in_addr(&route.rt_genmask)->s_addr; + char device[64]; + + fscanf(f, "%*[^\n]\n"); + while (fscanf(f, "%63s%X%*X%*X%*d%*u%*d%X%*d%*u%*u\n", + device, address, netmask) == 3) { + if (strcmp(argv[1], device)) { + uint32_t bit = ntohl(*netmask); + bit = htonl(bit ^ (1 << 31 | bit >> 1)); + if (bit) { + *netmask |= bit; + if (ioctl(s, SIOCADDRT, &route) == -1 && errno != EEXIST) { + break; + } + *address ^= bit; + if (ioctl(s, SIOCADDRT, &route) == -1 && errno != EEXIST) { + break; + } + errno = 0; + } + } + } + } + + if (!errno) { + char *dns = getenv("DNS1"); + property_set("vpn.dns1", dns ? dns : ""); + dns = getenv("DNS2"); + property_set("vpn.dns2", dns ? dns : ""); + property_set("vpn.status", "ok"); + __android_log_print(ANDROID_LOG_INFO, "ip-up-vpn", + "All traffic is now redirected to %s", argv[5]); + } else { + property_set("vpn.status", "error"); + __android_log_write(ANDROID_LOG_ERROR, "ip-up-vpn", strerror(errno)); + } + return errno; +} |