Merge "Add initial usbip util binary."

13 files changed, 816 insertions, 0 deletions

diff --git a/emulator/aosp_car_emulator.mk b/emulator/aosp_car_emulator.mk
index abf872d..b4ea95a 100644
--- a/emulator/aosp_car_emulator.mk
+++ b/emulator/aosp_car_emulator.mk
@@ -27,6 +27,7 @@ $(call inherit-product, device/generic/car/emulator/audio/car_emulator_audio.mk)
 $(call inherit-product, device/generic/car/emulator/rotary/car_rotary.mk)
 # Enables USB and BT-USB passthrough
 $(call inherit-product, device/generic/car/emulator/btusb-passthrough/btusb.mk)
+$(call inherit-product, device/generic/car/emulator/usbip-service/usbip-service.mk)
 
 ifeq (true,$(BUILD_EMULATOR_CLUSTER_DISPLAY))
 PRODUCT_COPY_FILES += \
diff --git a/emulator/usbip-service/Android.bp b/emulator/usbip-service/Android.bp
new file mode 100644
index 0000000..9ad8446
--- /dev/null
+++ b/emulator/usbip-service/Android.bp
@@ -0,0 +1,63 @@
+package {
+    default_applicable_licenses: ["external_usbip-service_license"],
+}
+
+license {
+    name: "external_usbip-service_license",
+    visibility: [":__subpackages__"],
+    license_kinds: ["SPDX-license-identifier-GPL-2.0"],
+    license_text: ["COPYING"],
+}
+
+cc_defaults {
+    name: "usbip_defaults",
+    host_supported: true,
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+    shared_libs: [
+        "liblog",
+        "libutils",
+        "libcutils",
+        "libbase",
+        "libc++",
+    ],
+    product_specific: true,
+    stl: "none",
+}
+
+cc_binary {
+    name: "usbip_service",
+    init_rc: ["usbip-service.rc"],
+    defaults: ["usbip_defaults"],
+    srcs: [
+        "UsbIpService.cpp"
+    ],
+    static_libs: [
+        "usbip_utils",
+    ],
+}
+
+cc_library {
+    name: "usbip_utils",
+    defaults: ["usbip_defaults"],
+    srcs: [
+        "UsbIpUtils.cpp"
+    ],
+    export_include_dirs: ["./"],
+}
+
+cc_test {
+    name: "usbip_test",
+    defaults: ["usbip_defaults"],
+    srcs: ["UsbIpTest.cpp"],
+    test_suites: ["general-tests"],
+
+    test_options: {
+        unit_test: false,
+    },
+    shared_libs: [
+        "usbip_utils",
+    ],
+}
diff --git a/emulator/usbip-service/COPYING b/emulator/usbip-service/COPYING
new file mode 100644
index 0000000..c5611e4
--- /dev/null
+++ b/emulator/usbip-service/COPYING
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
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+
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diff --git a/emulator/usbip-service/README.md b/emulator/usbip-service/README.md
new file mode 100644
index 0000000..693e86d
--- /dev/null
+++ b/emulator/usbip-service/README.md
@@ -0,0 +1,4 @@
+Implements a very basic version of usbip.
+
+GPLv2 license is maintained in this directory since it implements interfaces
+provided by the usbip library.
diff --git a/emulator/usbip-service/TEST_MAPPING b/emulator/usbip-service/TEST_MAPPING
new file mode 100644
index 0000000..c977d11
--- /dev/null
+++ b/emulator/usbip-service/TEST_MAPPING
@@ -0,0 +1,8 @@
+{
+  "presubmit": [
+    {
+      "name": "usbpip_test",
+      "host": true
+    }
+  ]
+}
diff --git a/emulator/usbip-service/UsbIpService.cpp b/emulator/usbip-service/UsbIpService.cpp
new file mode 100644
index 0000000..26d2f3d
--- /dev/null
+++ b/emulator/usbip-service/UsbIpService.cpp
@@ -0,0 +1,55 @@
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <log/log.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "UsbIpUtils.h"
+
+int main(int argc, char *argv[]) {
+    if (argc != 4) {
+        ALOGE("usage: 'usbip_service <ip_addr> <port> <dev_id>'\n");
+        return -1;
+    }
+    ALOGD("IP: %s\nPort: %s\nDevId: %s\n", argv[1], argv[2], argv[3]);
+
+    usbip_conn_info info;
+    if (!get_usbip_connection(argv[1], argv[2], argv[3], &info)) {
+        ALOGE("Couldn't retrieve socket connection\n");
+        return -1;
+    }
+
+    // Get free port.
+    FILE *file = fopen("/sys/devices/platform/vhci_hcd.0/status", "r");
+    if (file == NULL) {
+        ALOGE("Couldn't open sysfs status file: %s\n", strerror(errno));
+        close(info.sock_fd);
+        return -1;
+    }
+    int port_num = get_free_vhci_port(file, info.speed);
+
+    // Pass socket to the kernel driver.
+    int fd =
+        openat(AT_FDCWD, "/sys/devices/platform/vhci_hcd.0/attach", O_WRONLY);
+    if (fd == -1) {
+        ALOGE("Couldn't open sysfs attach file: %s\n", strerror(errno));
+        close(info.sock_fd);
+        return -1;
+    }
+    if (dprintf(fd, "%d %d %d %d", port_num, info.sock_fd, info.dev_id,
+                info.speed) < 0) {
+        ALOGE("Failed to attach socket to VHCI.\n");
+        close(info.sock_fd);
+        close(fd);
+        return -1;
+    }
+
+    close(info.sock_fd);
+    close(fd);
+    return 0;
+}
diff --git a/emulator/usbip-service/UsbIpTest.cpp b/emulator/usbip-service/UsbIpTest.cpp
new file mode 100644
index 0000000..97ef09c
--- /dev/null
+++ b/emulator/usbip-service/UsbIpTest.cpp
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2016 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 <gtest/gtest.h>
+
+#include <cstdio>
+#include <string>
+
+#include "UsbIpUtils.h"
+
+/* No virtual USB devices are attached. */
+static const std::string EMPTY_STATUS =
+    "hub port sta spd dev      sockfd local_busid\n"
+    "hs  0000 004 000 00000000 000000 0-0\n"
+    "hs  0001 004 000 00000000 000000 0-0\n"
+    "hs  0002 004 000 00000000 000000 0-0\n"
+    "hs  0003 004 000 00000000 000000 0-0\n"
+    "ss  0004 004 000 00000000 000000 0-0\n"
+    "ss  0005 004 000 00000000 000000 0-0\n"
+    "ss  0006 004 000 00000000 000000 0-0\n"
+    "ss  0007 004 000 00000000 000000 0-0";
+
+/* A single high speed an super speed device are attached. */
+static const std::string PORTS_ALLOCATED =
+    "hub port sta spd dev      sockfd local_busid\n"
+    "hs  0000 006 003 00010003 000003 4-1\n"
+    "hs  0001 004 000 00000000 000000 0-0\n"
+    "hs  0002 004 000 00000000 000000 0-0\n"
+    "hs  0003 004 000 00000000 000000 0-0\n"
+    "ss  0004 006 004 00010004 000004 5-1\n"
+    "ss  0005 004 000 00000000 000000 0-0\n"
+    "ss  0006 004 000 00000000 000000 0-0\n"
+    "ss  0007 004 000 00000000 000000 0-0";
+
+/* All USB device ports are allocated. */
+static const std::string NONE_AVAILABLE =
+    "hub port sta spd dev      sockfd local_busid\n"
+    "hs  0000 006 003 00010001 000003 4-1\n"
+    "hs  0001 006 003 00010002 000004 4-2\n"
+    "hs  0002 006 003 00010003 000005 4-3\n"
+    "hs  0003 006 003 00010004 000006 4-4\n"
+    "ss  0004 006 004 00010005 000007 5-1\n"
+    "ss  0005 006 004 00010006 000008 5-2\n"
+    "ss  0006 006 004 00010007 000009 5-3\n"
+    "ss  0007 006 004 00010008 000010 5-4";
+
+/*
+ * Returns a file pointer associated with a std::string.
+ * NOTE: User should call fclose on the pointer when done.
+ */
+static FILE *get_fp_from_string(const std::string &test_input) {
+    return fmemopen((void *)test_input.c_str(), test_input.size(), "r");
+}
+
+TEST(UsbIpTest, ReturnsFirstHighSpeedPort) {
+    FILE *file = get_fp_from_string(EMPTY_STATUS);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_HIGH), 0);
+    fclose(file);
+}
+
+TEST(UsbIpTest, ReturnsFirstSuperSpeedPort) {
+    FILE *file = get_fp_from_string(EMPTY_STATUS);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_SUPER), 4);
+    fclose(file);
+}
+
+TEST(UsbIpTest, ReturnsFirstFreeHighSpeedPort) {
+    FILE *file = get_fp_from_string(PORTS_ALLOCATED);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_HIGH), 1);
+    fclose(file);
+}
+
+TEST(UsbIpTest, ReturnsFirstFreeSuperSpeedPort) {
+    FILE *file = get_fp_from_string(PORTS_ALLOCATED);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_SUPER), 5);
+    fclose(file);
+}
+
+TEST(UsbIpTest, AllHighSpeedPortsAllocatted) {
+    FILE *file = get_fp_from_string(NONE_AVAILABLE);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_HIGH), -1);
+    fclose(file);
+}
+
+TEST(UsbIpTest, AllSuperSpeedPortsAllocated) {
+    FILE *file = get_fp_from_string(NONE_AVAILABLE);
+    ASSERT_EQ(get_free_vhci_port(file, USBIP_SPEED_SUPER), -1);
+    fclose(file);
+}
diff --git a/emulator/usbip-service/UsbIpUtils.cpp b/emulator/usbip-service/UsbIpUtils.cpp
new file mode 100644
index 0000000..ce449f7
--- /dev/null
+++ b/emulator/usbip-service/UsbIpUtils.cpp
@@ -0,0 +1,178 @@
+#include "UsbIpUtils.h"
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <log/log.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+constexpr uint16_t kIpVersion = 0x0111;
+
+constexpr uint16_t kOpRequest = 0x8003;
+constexpr uint16_t kOpResponse = 0x0003;
+
+//  Fields associated with all USBIP packets.
+typedef struct op_req_common {
+    uint16_t ip_version;
+    uint16_t command_code;
+    uint32_t status;
+} op_req_common;
+
+typedef struct op_req_import {
+    op_req_common common;
+    uint32_t busid[8];
+} op_req_import;
+
+typedef struct op_rep_import {
+    op_req_common common;
+} op_rep_import;
+
+// Metadata fields only valid for successful status flag.
+typedef struct op_rep_import_metadata {
+    uint32_t path[64];
+    uint32_t bus_id[8];
+    uint32_t bus_num;
+    uint32_t dev_num;
+    uint32_t speed;
+    uint16_t id_vendor;
+    uint16_t id_product;
+    uint16_t bcd_device;
+    uint8_t device_class;
+    uint8_t device_subclass;
+    uint8_t device_protocol;
+    uint8_t configuration_value;
+    uint8_t num_configurations;
+    uint8_t num_interfaces;
+} op_rep_import_success;
+
+bool get_usbip_connection(const char *server, const char *port,
+                          const char *dev_id, usbip_conn_info *info) {
+    struct sockaddr_in address;
+
+    // Setup socket to the server.
+    if ((info->sock_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == 0) {
+        ALOGE("Opening socket failed: %s\n", strerror(errno));
+        return false;
+    }
+
+    int flags = 1;
+    if (setsockopt(info->sock_fd, SOL_SOCKET, SO_KEEPALIVE, &flags,
+                   sizeof(flags)) == -1) {
+        ALOGE("Failed to enable keep alive: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+    if (setsockopt(info->sock_fd, SOL_TCP, TCP_NODELAY, &flags,
+                   sizeof(flags)) == -1) {
+        ALOGE("Failed to enable no delay: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+
+    address.sin_family = AF_INET;
+    if (inet_aton(server, &address.sin_addr) == 0) {
+        ALOGE("Failure to convert ip address %s\n", server);
+        close(info->sock_fd);
+        return false;
+    }
+
+    errno = 0;
+    char *error;
+    address.sin_port = strtol(port, &error, 10);
+    if (address.sin_port == 0) {
+        ALOGE("Port is invalid %s\n", port);
+        close(info->sock_fd);
+        return false;
+    }
+    address.sin_port = htons(address.sin_port);
+    if (connect(info->sock_fd, (struct sockaddr *)&address, sizeof(address)) ==
+        -1) {
+        ALOGE("Connection failed: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+
+    // Fill in op request
+    op_req_import op_req;
+    op_req.common.ip_version = htons(kIpVersion);
+    op_req.common.command_code = htons(kOpRequest);
+    op_req.common.status = 0x0000;
+    strncpy((char *)op_req.busid, dev_id, sizeof(op_req.busid));
+
+    if (send(info->sock_fd, &op_req, sizeof(op_req), 0) == -1) {
+        ALOGE("Error sending op_req: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+
+    // Read in op response.
+    op_rep_import op_rep;
+    if (recv(info->sock_fd, &op_rep, sizeof(op_rep), MSG_WAITALL) == -1) {
+        ALOGE("Error receiving op_rep: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+
+    if (op_rep.common.status != 0) {
+        ALOGE("op_rep status is invalid.\n");
+        close(info->sock_fd);
+        return false;
+    }
+
+    uint16_t command = ntohs(op_rep.common.command_code);
+    if (command != kOpResponse) {
+        ALOGE("Invalid command expected: %d received: %d", command, kOpResponse);
+        close(info->sock_fd);
+        return false;
+    }
+
+    op_rep_import_success data;
+    if (recv(info->sock_fd, &data, sizeof(data), MSG_WAITALL) == -1) {
+        ALOGE("Error receiving op_rep_data: %s\n", strerror(errno));
+        close(info->sock_fd);
+        return false;
+    }
+
+    int temp_bus_num = ntohl(data.bus_num);
+    int temp_dev_num = ntohl(data.dev_num);
+    info->speed = ntohl(data.speed);
+    info->dev_id = (temp_bus_num << 16) | temp_dev_num;
+    return true;
+}
+
+int get_free_vhci_port(FILE *file, int speed) {
+    // Throw away the header line.
+    char *buf = NULL;
+    size_t length = 0;
+    if (getline(&buf, &length, file) == -1) {
+        ALOGE("Couldn't get the header line: %s\n", strerror(errno));
+        free(buf);
+        return -1;
+    }
+    free(buf);
+
+    char busid[32];
+    char hub[3];
+    int port = 0;
+    int status = 0;
+    int spd = 0;
+    int dev = 0;
+    int sockfd = 0;
+    const char *expected_hub = (speed == USBIP_SPEED_SUPER) ? "ss" : "hs";
+
+    // Scan status lines for a free USB port.
+    while (fscanf(file, "%2s %d %d %d %x %u %31s\n", hub, &port, &status, &spd,
+                  &dev, &sockfd, busid) != EOF) {
+        if (strcmp(expected_hub, hub) == 0 && status == USBIP_VDEV_NULL) {
+            return port;
+        }
+    }
+
+    return -1;
+}
diff --git a/emulator/usbip-service/UsbIpUtils.h b/emulator/usbip-service/UsbIpUtils.h
new file mode 100644
index 0000000..c410ba0
--- /dev/null
+++ b/emulator/usbip-service/UsbIpUtils.h
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+// Speed constants
+inline constexpr int USBIP_SPEED_HIGH = 3;
+inline constexpr int USBIP_SPEED_SUPER = 4;
+
+// Status Constants
+inline constexpr int USBIP_VDEV_NULL = 4;
+
+// Connection information
+typedef struct usbip_conn_info {
+    int sock_fd;
+    int speed;
+    int dev_id;
+} usbip_conn_info;
+
+/*
+ * Connects to server and retrieves required info for connection.
+ * NOTE: User must close the sock_fd when they are done with it.
+ */
+bool get_usbip_connection(const char *server, const char *port,
+                          const char *dev_id, usbip_conn_info *info);
+
+/* Returns free port number from vhci, -1 on failure. */
+int get_free_vhci_port(FILE *file, int speed);
diff --git a/emulator/usbip-service/sepolicy/file_contexts b/emulator/usbip-service/sepolicy/file_contexts
new file mode 100644
index 0000000..47fe583
--- /dev/null
+++ b/emulator/usbip-service/sepolicy/file_contexts
@@ -0,0 +1,4 @@
+/product/bin/usbip_service u:object_r:usbip_service_exec:s0
+/sys/devices/platform/vhci_hcd.0/status u:object_r:sysfs_usbip:s0
+/sys/devices/platform/vhci_hcd.0/attach u:object_r:sysfs_usbip:s0
+
diff --git a/emulator/usbip-service/sepolicy/usbip_service.te b/emulator/usbip-service/sepolicy/usbip_service.te
new file mode 100644
index 0000000..b885493
--- /dev/null
+++ b/emulator/usbip-service/sepolicy/usbip_service.te
@@ -0,0 +1,16 @@
+type usbip_service, domain;
+type sysfs_usbip, sysfs_type, fs_type;
+type usbip_service_exec, exec_type, system_file_type, file_type;
+
+net_domain(usbip_service);
+
+allow usbip_service netd:tcp_socket { read write };
+
+allow kernel su:tcp_socket { read write };
+allow kernel shell:tcp_socket { read write };
+
+allow init sysfs_usbip:file setattr;
+
+allow shell sysfs_usbip:dir { r_dir_perms };
+allow shell sysfs_usbip:file { rw_file_perms };
+allow shell usbip_service_exec:file { execute execute_no_trans getattr map open read };
diff --git a/emulator/usbip-service/usbip-service.mk b/emulator/usbip-service/usbip-service.mk
new file mode 100644
index 0000000..84c2cca
--- /dev/null
+++ b/emulator/usbip-service/usbip-service.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (C) 2021 Google Inc.
+#
+# 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.
+#
+
+PRODUCT_PACKAGES += usbip_service
+BOARD_SEPOLICY_DIRS += device/generic/car/emulator/usbip-service/sepolicy
+
diff --git a/emulator/usbip-service/usbip-service.rc b/emulator/usbip-service/usbip-service.rc
new file mode 100644
index 0000000..7172bb7
--- /dev/null
+++ b/emulator/usbip-service/usbip-service.rc
@@ -0,0 +1,2 @@
+on boot
+	chmod 222 /sys/bus/platform/devices/vhci_hcd.0/attach