add unix socket

src/main/jni/system.cpp

@@ -5,8 +5,15 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <errno.h>
 #include <cpu-features.h>
 
+#include <sys/un.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <ancillary.h>
+
 #define LOGI(...) do { __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__); } while(0)
 #define LOGW(...) do { __android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__); } while(0)
 #define LOGE(...) do { __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__); } while(0)
@@ -36,9 +43,40 @@ void Java_com_github_shadowsocks_system_exec(JNIEnv *env, jobject thiz, jstring
     env->ReleaseStringUTFChars(cmd, str);
 }
 
+jint Java_com_github_shadowsocks_system_sendfd(JNIEnv *env, jobject thiz, jint tun_fd) {
+    int fd;
+    struct sockaddr_un addr;
+
+    if ( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+        LOGE("socket() failed: %s (socket fd = %d)\n", strerror(errno), fd);
+        return (jint)-1;
+    }
+
+    memset(&addr, 0, sizeof(addr));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, "/data/data/com.github.shadowsocks/sock_path", sizeof(addr.sun_path)-1);
+
+    if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
+        LOGE("connect() failed: %s (fd = %d)\n", strerror(errno), fd);
+        close(fd);
+        return (jint)-1;
+    }
+
+    if (ancil_send_fd(fd, tun_fd)) {
+        LOGE("ancil_send_fd: %s", strerror(errno));
+        close(fd);
+        return (jint)-1;
+    }
+
+    close(fd);
+    return 0;
+}
+
 static const char *classPathName = "com/github/shadowsocks/System";
 
 static JNINativeMethod method_table[] = {
+    { "sendfd", "(I)I",
+        (void*) Java_com_github_shadowsocks_system_sendfd },
     { "exec", "(Ljava/lang/String;)V",
         (void*) Java_com_github_shadowsocks_system_exec },
     { "getABI", "()Ljava/lang/String;",