--- /dev/null
+/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
+/*
+ * non-rooted Android usbfs backend for libusb
+ * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
+ * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
+ * Copyright (c) 2013 Nathan Hjelm <hjelmn@mac.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define LOG_TAG "libusb/netlink"
+#if 0 // デバッグ情報を出さない時1
+ #ifndef LOG_NDEBUG
+ #define LOG_NDEBUG // LOGV/LOGD/MARKを出力しない時
+ #endif
+ #undef USE_LOGALL // 指定したLOGxだけを出力
+#else
+ #define USE_LOGALL
+ #undef LOG_NDEBUG
+ #undef NDEBUG
+ #define GET_RAW_DESCRIPTOR
+#endif
+
+#include "config.h"
+#include "libusb.h"
+#include "libusbi.h"
+#include "android_usbfs.h"
+
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#ifdef HAVE_ASM_TYPES_H
+#include <asm/types.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#include <arpa/inet.h>
+
+#ifdef HAVE_LINUX_NETLINK_H
+#include <linux/netlink.h>
+#endif
+
+#ifdef HAVE_LINUX_FILTER_H
+#include <linux/filter.h>
+#endif
+
+#define KERNEL 1
+
+static int android_netlink_socket = -1;
+static int netlink_control_pipe[2] = { -1, -1 };
+static pthread_t libusb_android_event_thread;
+
+static void *android_netlink_event_thread_main(void *arg);
+
+struct sockaddr_nl snl = { .nl_family=AF_NETLINK, .nl_groups=KERNEL };
+
+static int set_fd_cloexec_nb (int fd)
+{
+ int flags;
+
+#if defined(FD_CLOEXEC)
+ flags = fcntl (android_netlink_socket, F_GETFD);
+ if (0 > flags) {
+ return -1;
+ }
+
+ if (!(flags & FD_CLOEXEC)) {
+ fcntl (android_netlink_socket, F_SETFD, flags | FD_CLOEXEC);
+ }
+#endif
+
+ flags = fcntl (android_netlink_socket, F_GETFL);
+ if (0 > flags) {
+ return -1;
+ }
+
+ if (!(flags & O_NONBLOCK)) {
+ fcntl (android_netlink_socket, F_SETFL, flags | O_NONBLOCK);
+ }
+
+ return 0;
+}
+
+int android_netlink_start_event_monitor(void)
+{
+ ENTER();
+ int socktype = SOCK_RAW;
+ int ret;
+
+ snl.nl_groups = KERNEL;
+
+#if defined(SOCK_CLOEXEC)
+ socktype |= SOCK_CLOEXEC;
+#endif
+#if defined(SOCK_NONBLOCK)
+ socktype |= SOCK_NONBLOCK;
+#endif
+
+ android_netlink_socket = socket(PF_NETLINK, socktype, NETLINK_KOBJECT_UEVENT);
+ if (-1 == android_netlink_socket && EINVAL == errno) {
+ android_netlink_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
+ }
+
+ if (-1 == android_netlink_socket) {
+ LOGE("failed to create android_netlink_socket:errno=%d", errno); // 13:Permission deniedが返ってくる
+ RETURN(LIBUSB_ERROR_OTHER, int);
+ }
+
+ ret = set_fd_cloexec_nb (android_netlink_socket);
+ if (0 != ret) {
+ close (android_netlink_socket);
+ android_netlink_socket = -1;
+ RETURN(LIBUSB_ERROR_OTHER, int);
+ }
+
+ ret = bind(android_netlink_socket, (struct sockaddr *) &snl, sizeof(snl));
+ if (0 != ret) {
+ close(android_netlink_socket);
+ RETURN(LIBUSB_ERROR_OTHER, int);
+ }
+
+ /* TODO -- add authentication */
+ /* setsockopt(android_netlink_socket, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); */
+
+ ret = usbi_pipe(netlink_control_pipe);
+ if (ret) {
+ LOGE("could not create netlink control pipe");
+ usbi_err(NULL, "could not create netlink control pipe");
+ close(android_netlink_socket);
+ RETURN(LIBUSB_ERROR_OTHER, int);
+ }
+
+ ret = pthread_create(&libusb_android_event_thread, NULL, android_netlink_event_thread_main, NULL);
+ if (0 != ret) {
+ close(netlink_control_pipe[0]);
+ close(netlink_control_pipe[1]);
+ close(android_netlink_socket);
+ RETURN(LIBUSB_ERROR_OTHER, int);
+ }
+
+ RETURN(LIBUSB_SUCCESS, int);
+}
+
+int android_netlink_stop_event_monitor(void)
+{
+ int r;
+ char dummy = 1;
+
+ if (-1 == android_netlink_socket) {
+ /* already closed. nothing to do */
+ return LIBUSB_SUCCESS;
+ }
+
+ /* Write some dummy data to the control pipe and
+ * wait for the thread to exit */
+ r = usbi_write(netlink_control_pipe[1], &dummy, sizeof(dummy));
+ if (r <= 0) {
+ usbi_warn(NULL, "netlink control pipe signal failed");
+ }
+ pthread_join(libusb_android_event_thread, NULL);
+
+ close(android_netlink_socket);
+ android_netlink_socket = -1;
+
+ /* close and reset control pipe */
+ close(netlink_control_pipe[0]);
+ close(netlink_control_pipe[1]);
+ netlink_control_pipe[0] = -1;
+ netlink_control_pipe[1] = -1;
+
+ return LIBUSB_SUCCESS;
+}
+
+static const char *netlink_message_parse (const char *buffer, size_t len, const char *key)
+{
+ size_t keylen = strlen(key);
+ size_t offset;
+
+ for (offset = 0 ; offset < len && '\0' != buffer[offset] ; offset += strlen(buffer + offset) + 1) {
+ if (0 == strncmp(buffer + offset, key, keylen) &&
+ '=' == buffer[offset + keylen]) {
+ return buffer + offset + keylen + 1;
+ }
+ }
+
+ return NULL;
+}
+
+/* parse parts of netlink message common to both libudev and the kernel */
+static int android_netlink_parse(char *buffer, size_t len, int *detached, const char **sys_name,
+ uint8_t *busnum, uint8_t *devaddr) {
+ const char *tmp;
+ int i;
+
+ errno = 0;
+
+ *sys_name = NULL;
+ *detached = 0;
+ *busnum = 0;
+ *devaddr = 0;
+
+ tmp = netlink_message_parse((const char *) buffer, len, "ACTION");
+ if (tmp == NULL)
+ return -1;
+ if (0 == strcmp(tmp, "remove")) {
+ *detached = 1;
+ } else if (0 == strcmp(tmp, "add")) {
+ // pass through
+ } else if (0 != strcmp(tmp, "change")) {
+ usbi_dbg("unknown device action [%s]", tmp);
+ return -1;
+ }
+
+ /* check that this is a usb message */
+ tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
+ if (NULL == tmp || 0 != strcmp(tmp, "usb")) {
+ /* not usb. ignore */
+ return -1;
+ }
+
+ tmp = netlink_message_parse(buffer, len, "BUSNUM");
+ if (NULL == tmp) {
+ /* no bus number. try "DEVICE" */
+ tmp = netlink_message_parse(buffer, len, "DEVICE");
+ if (NULL == tmp) {
+ /* not usb. ignore */
+ return -1;
+ }
+
+ /* Parse a device path such as /dev/bus/usb/003/004 */
+ char *pLastSlash = (char*)strrchr(tmp,'/');
+ if(NULL == pLastSlash) {
+ return -1;
+ }
+
+ *devaddr = strtoul(pLastSlash + 1, NULL, 10);
+ if (errno) {
+ errno = 0;
+ return -1;
+ }
+
+ *busnum = strtoul(pLastSlash - 3, NULL, 10);
+ if (errno) {
+ errno = 0;
+ return -1;
+ }
+
+ return 0;
+ }
+
+ *busnum = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
+ if (errno) {
+ errno = 0;
+ return -1;
+ }
+
+ tmp = netlink_message_parse(buffer, len, "DEVNUM");
+ if (NULL == tmp) {
+ return -1;
+ }
+
+ *devaddr = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
+ if (errno) {
+ errno = 0;
+ return -1;
+ }
+
+ tmp = netlink_message_parse(buffer, len, "DEVPATH");
+ if (NULL == tmp) {
+ return -1;
+ }
+
+ for (i = strlen(tmp) - 1 ; i ; --i) {
+ if ('/' ==tmp[i]) {
+ *sys_name = tmp + i + 1;
+ break;
+ }
+ }
+
+ /* found a usb device */
+ return 0;
+}
+
+static int android_netlink_read_message(void)
+{
+ char buffer[1024]; // XXX changed from unsigned char to char because the first argument of android_netlink_parse is char *
+ struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer)};
+ struct msghdr meh = { .msg_iov=&iov, .msg_iovlen=1,
+ .msg_name=&snl, .msg_namelen=sizeof(snl) };
+ const char *sys_name = NULL;
+ uint8_t busnum, devaddr;
+ int detached, r;
+ size_t len;
+
+ /* read netlink message */
+ memset(buffer, 0, sizeof(buffer));
+ len = recvmsg(android_netlink_socket, &meh, 0);
+ if (len < 32) {
+ if (errno != EAGAIN)
+ usbi_dbg("error recieving message from netlink");
+ return -1;
+ }
+
+ /* TODO -- authenticate this message is from the kernel or udevd */
+
+ r = android_netlink_parse(buffer, len, &detached, &sys_name, &busnum, &devaddr);
+ if (r)
+ return r;
+
+ usbi_dbg("netlink hotplug found device busnum: %hhu, devaddr: %hhu, sys_name: %s, removed: %s",
+ busnum, devaddr, sys_name, detached ? "yes" : "no");
+
+ /* signal device is available (or not) to all contexts */
+ if (detached)
+ android_device_disconnected(busnum, devaddr, sys_name);
+ else
+ android_hotplug_enumerate(busnum, devaddr, sys_name);
+
+ return 0;
+}
+
+static void *android_netlink_event_thread_main(void *arg)
+{
+ char dummy;
+ int r;
+ struct pollfd fds[] = {
+ { .fd = netlink_control_pipe[0],
+ .events = POLLIN },
+ { .fd = android_netlink_socket,
+ .events = POLLIN },
+ };
+
+ /* silence compiler warning */
+ (void) arg;
+
+ while (poll(fds, 2, -1) >= 0) {
+ if (fds[0].revents & POLLIN) {
+ /* activity on control pipe, read the byte and exit */
+ r = usbi_read(netlink_control_pipe[0], &dummy, sizeof(dummy));
+ if (r <= 0) {
+ usbi_warn(NULL, "netlink control pipe read failed");
+ }
+ break;
+ }
+ if (fds[1].revents & POLLIN) {
+ usbi_mutex_static_lock(&android_hotplug_lock);
+ android_netlink_read_message();
+ usbi_mutex_static_unlock(&android_hotplug_lock);
+ }
+ }
+
+ return NULL;
+}
+
+void android_netlink_hotplug_poll(void)
+{
+ int r;
+
+ usbi_mutex_static_lock(&android_hotplug_lock);
+ do {
+ r = android_netlink_read_message();
+ } while (r == 0);
+ usbi_mutex_static_unlock(&android_hotplug_lock);
+}
projects / rtmpclient.git / blobdiff