add traffic stat IPC calls

src/android.c

@@ -55,10 +55,10 @@ int protect_socket(int fd)
         return -1;
     }
 
-    // Set timeout to 100us
+    // Set timeout to 1s
     struct timeval tv;
-    tv.tv_sec = 1;  /*  0 Secs Timeout */
-    tv.tv_usec = 0; // Not init'ing this can cause strange errors
+    tv.tv_sec = 1;
+    tv.tv_usec = 0;
     setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(struct timeval));
     setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(struct timeval));
 
@@ -92,3 +92,53 @@ int protect_socket(int fd)
     return ret;
 }
 
+int send_traffic_stat(uint64_t tx, uint64_t rx)
+{
+    int sock;
+    struct sockaddr_un addr;
+
+    if ( (sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+        LOGE("[android] socket() failed: %s (socket fd = %d)\n", strerror(errno), sock);
+        return -1;
+    }
+
+    // Set timeout to 1s
+    struct timeval tv;
+    tv.tv_sec = 1;
+    tv.tv_usec = 0;
+    setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(struct timeval));
+    setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(struct timeval));
+
+    const char path[] = "/data/data/com.github.shadowsocks/stat_path";
+
+    memset(&addr, 0, sizeof(addr));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
+
+    if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+        LOGE("[android] connect() failed: %s (socket fd = %d)\n", strerror(errno), sock);
+        close(sock);
+        return -1;
+    }
+
+    char stat[256] = {0};
+    snprintf(stat, 256, "%" PRIu64 "|%" PRIu64, tx, rx);
+    size_t len = strlen(stat);
+
+    if (send(sock, stat, len, 0) == -1) {
+        ERROR("[android] send");
+        close(sock);
+        return -1;
+    }
+
+    char ret = 0;
+
+    if (recv(sock, &ret, 1, 0) == -1) {
+        ERROR("[android] recv");
+        close(sock);
+        return -1;
+    }
+
+    close(sock);
+    return ret;
+}