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-rw-r--r--daemon/usb-linux.c542
1 files changed, 542 insertions, 0 deletions
diff --git a/daemon/usb-linux.c b/daemon/usb-linux.c
new file mode 100644
index 0000000..c09cdc9
--- /dev/null
+++ b/daemon/usb-linux.c
@@ -0,0 +1,542 @@
+/*
+ usbmuxd - iPhone/iPod Touch USB multiplex server daemon
+
+Copyright (C) 2009 Hector Martin "marcan" <hector@marcansoft.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 or version 3.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <libusb.h>
+
+#include "usb.h"
+#include "log.h"
+#include "device.h"
+
+// interval for device connection/disconnection polling, in milliseconds
+// we need this because there is currently no asynchronous device discovery mechanism in libusb
+#define DEVICE_POLL_TIME 1000
+
+struct usb_device {
+ libusb_device_handle *dev;
+ uint8_t bus, address;
+ uint16_t vid, pid;
+ char serial[256];
+ int alive;
+ struct libusb_transfer *rx_xfer;
+ struct collection tx_xfers;
+ int wMaxPacketSize;
+};
+
+static struct collection device_list;
+
+static struct timeval next_dev_poll_time;
+
+static int devlist_failures;
+
+static void usb_disconnect(struct usb_device *dev)
+{
+ if(!dev->dev) {
+ return;
+ }
+
+ // kill the rx xfer and tx xfers and try to make sure the callbacks get called before we free the device
+ if(dev->rx_xfer) {
+ usbmuxd_log(LL_DEBUG, "usb_disconnect: cancelling RX xfer");
+ libusb_cancel_transfer(dev->rx_xfer);
+ }
+ FOREACH(struct libusb_transfer *xfer, &dev->tx_xfers) {
+ usbmuxd_log(LL_DEBUG, "usb_disconnect: cancelling TX xfer %p", xfer);
+ libusb_cancel_transfer(xfer);
+ } ENDFOREACH
+
+ while(dev->rx_xfer || collection_count(&dev->tx_xfers)) {
+ struct timeval tv;
+ int res;
+
+ tv.tv_sec = 0;
+ tv.tv_usec = 1000;
+ if((res = libusb_handle_events_timeout(NULL, &tv)) < 0) {
+ usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout for usb_disconnect failed: %d", res);
+ break;
+ }
+ }
+ collection_free(&dev->tx_xfers);
+ libusb_release_interface(dev->dev, USB_INTERFACE);
+ libusb_close(dev->dev);
+ dev->dev = NULL;
+ collection_remove(&device_list, dev);
+ free(dev);
+}
+
+static void tx_callback(struct libusb_transfer *xfer)
+{
+ struct usb_device *dev = xfer->user_data;
+ usbmuxd_log(LL_SPEW, "TX callback dev %d-%d len %d -> %d status %d", dev->bus, dev->address, xfer->length, xfer->actual_length, xfer->status);
+ if(xfer->status != LIBUSB_TRANSFER_COMPLETED) {
+ switch(xfer->status) {
+ case LIBUSB_TRANSFER_COMPLETED: //shut up compiler
+ case LIBUSB_TRANSFER_ERROR:
+ // funny, this happens when we disconnect the device while waiting for a transfer, sometimes
+ usbmuxd_log(LL_INFO, "Device %d-%d TX aborted due to error or disconnect", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_TIMED_OUT:
+ usbmuxd_log(LL_ERROR, "TX transfer timed out for device %d-%d", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_CANCELLED:
+ usbmuxd_log(LL_DEBUG, "Device %d-%d TX transfer cancelled", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_STALL:
+ usbmuxd_log(LL_ERROR, "TX transfer stalled for device %d-%d", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_NO_DEVICE:
+ // other times, this happens, and also even when we abort the transfer after device removal
+ usbmuxd_log(LL_INFO, "Device %d-%d TX aborted due to disconnect", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_OVERFLOW:
+ usbmuxd_log(LL_ERROR, "TX transfer overflow for device %d-%d", dev->bus, dev->address);
+ break;
+ // and nothing happens (this never gets called) if the device is freed after a disconnect! (bad)
+ }
+ // we can't usb_disconnect here due to a deadlock, so instead mark it as dead and reap it after processing events
+ // we'll do device_remove there too
+ dev->alive = 0;
+ }
+ if(xfer->buffer)
+ free(xfer->buffer);
+ collection_remove(&dev->tx_xfers, xfer);
+ libusb_free_transfer(xfer);
+}
+
+int usb_send(struct usb_device *dev, const unsigned char *buf, int length)
+{
+ int res;
+ struct libusb_transfer *xfer = libusb_alloc_transfer(0);
+ libusb_fill_bulk_transfer(xfer, dev->dev, BULK_OUT, (void*)buf, length, tx_callback, dev, 0);
+ xfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK;
+#ifndef EXPLICIT_ZLP_TRANSACTION
+ if (length % dev->wMaxPacketSize == 0) {
+ xfer->flags |= LIBUSB_TRANSFER_ZERO_PACKET;
+ }
+#endif
+ if((res = libusb_submit_transfer(xfer)) < 0) {
+ usbmuxd_log(LL_ERROR, "Failed to submit TX transfer %p len %d to device %d-%d: %d", buf, length, dev->bus, dev->address, res);
+ libusb_free_transfer(xfer);
+ return res;
+ }
+ collection_add(&dev->tx_xfers, xfer);
+#ifdef EXPLICIT_ZLP_TRANSACTION
+ if (length % dev->wMaxPacketSize == 0) {
+ usbmuxd_log(LL_DEBUG, "Send ZLP");
+ // Send Zero Length Packet
+ xfer = libusb_alloc_transfer(0);
+ void *buffer = malloc(1);
+ libusb_fill_bulk_transfer(xfer, dev->dev, BULK_OUT, buffer, 0, tx_callback, dev, 0);
+ xfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK;
+ if((res = libusb_submit_transfer(xfer)) < 0) {
+ usbmuxd_log(LL_ERROR, "Failed to submit TX ZLP transfer to device %d-%d: %d", dev->bus, dev->address, res);
+ libusb_free_transfer(xfer);
+ return res;
+ }
+ collection_add(&dev->tx_xfers, xfer);
+ }
+#endif
+ return 0;
+}
+
+static void rx_callback(struct libusb_transfer *xfer)
+{
+ struct usb_device *dev = xfer->user_data;
+ usbmuxd_log(LL_SPEW, "RX callback dev %d-%d len %d status %d", dev->bus, dev->address, xfer->actual_length, xfer->status);
+ if(xfer->status == LIBUSB_TRANSFER_COMPLETED) {
+ device_data_input(dev, xfer->buffer, xfer->actual_length);
+ libusb_submit_transfer(xfer);
+ } else {
+ switch(xfer->status) {
+ case LIBUSB_TRANSFER_COMPLETED: //shut up compiler
+ case LIBUSB_TRANSFER_ERROR:
+ // funny, this happens when we disconnect the device while waiting for a transfer, sometimes
+ usbmuxd_log(LL_INFO, "Device %d-%d RX aborted due to error or disconnect", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_TIMED_OUT:
+ usbmuxd_log(LL_ERROR, "RX transfer timed out for device %d-%d", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_CANCELLED:
+ usbmuxd_log(LL_DEBUG, "Device %d-%d RX transfer cancelled", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_STALL:
+ usbmuxd_log(LL_ERROR, "RX transfer stalled for device %d-%d", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_NO_DEVICE:
+ // other times, this happens, and also even when we abort the transfer after device removal
+ usbmuxd_log(LL_INFO, "Device %d-%d RX aborted due to disconnect", dev->bus, dev->address);
+ break;
+ case LIBUSB_TRANSFER_OVERFLOW:
+ usbmuxd_log(LL_ERROR, "RX transfer overflow for device %d-%d", dev->bus, dev->address);
+ break;
+ // and nothing happens (this never gets called) if the device is freed after a disconnect! (bad)
+ }
+ free(xfer->buffer);
+ dev->rx_xfer = NULL;
+ libusb_free_transfer(xfer);
+ // we can't usb_disconnect here due to a deadlock, so instead mark it as dead and reap it after processing events
+ // we'll do device_remove there too
+ dev->alive = 0;
+ }
+}
+
+static int start_rx(struct usb_device *dev)
+{
+ int res;
+ void *buf;
+ dev->rx_xfer = libusb_alloc_transfer(0);
+ buf = malloc(USB_MRU);
+ libusb_fill_bulk_transfer(dev->rx_xfer, dev->dev, BULK_IN, buf, USB_MRU, rx_callback, dev, 0);
+ if((res = libusb_submit_transfer(dev->rx_xfer)) != 0) {
+ usbmuxd_log(LL_ERROR, "Failed to submit RX transfer to device %d-%d: %d", dev->bus, dev->address, res);
+ libusb_free_transfer(dev->rx_xfer);
+ dev->rx_xfer = NULL;
+ return res;
+ }
+ return 0;
+}
+
+static int usb_discover(void)
+{
+ int cnt, i, res;
+ int valid_count = 0;
+ libusb_device **devs;
+
+ cnt = libusb_get_device_list(NULL, &devs);
+ if(cnt < 0) {
+ usbmuxd_log(LL_WARNING, "Could not get device list: %d", cnt);
+ devlist_failures++;
+ // sometimes libusb fails getting the device list if you've just removed something
+ if(devlist_failures > 5) {
+ usbmuxd_log(LL_FATAL, "Too many errors getting device list\n");
+ return cnt;
+ } else {
+ gettimeofday(&next_dev_poll_time, NULL);
+ next_dev_poll_time.tv_usec += DEVICE_POLL_TIME * 1000;
+ next_dev_poll_time.tv_sec += next_dev_poll_time.tv_usec / 1000000;
+ next_dev_poll_time.tv_usec = next_dev_poll_time.tv_usec % 1000000;
+ return 0;
+ }
+ }
+ devlist_failures = 0;
+
+ usbmuxd_log(LL_SPEW, "usb_discover: scanning %d devices", cnt);
+
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ usbdev->alive = 0;
+ } ENDFOREACH
+
+ for(i=0; i<cnt; i++) {
+ // the following are non-blocking operations on the device list
+ libusb_device *dev = devs[i];
+ uint8_t bus = libusb_get_bus_number(dev);
+ uint8_t address = libusb_get_device_address(dev);
+ struct libusb_device_descriptor devdesc;
+ int found = 0;
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ if(usbdev->bus == bus && usbdev->address == address) {
+ valid_count++;
+ usbdev->alive = 1;
+ found = 1;
+ break;
+ }
+ } ENDFOREACH
+ if(found)
+ continue; //device already found
+ if((res = libusb_get_device_descriptor(dev, &devdesc)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not get device descriptor for device %d-%d: %d", bus, address, res);
+ continue;
+ }
+ if(devdesc.idVendor != VID_APPLE)
+ continue;
+ if( (devdesc.idProduct != PID_IPHONE2G) &&
+ (devdesc.idProduct != PID_ITOUCH1G) &&
+ (devdesc.idProduct != PID_IPHONE3G) &&
+ (devdesc.idProduct != PID_ITOUCH2G) &&
+ (devdesc.idProduct != PID_IPHONE3GS))
+ continue;
+ libusb_device_handle *handle;
+ usbmuxd_log(LL_INFO, "Found new device with v/p %04x:%04x at %d-%d", devdesc.idVendor, devdesc.idProduct, bus, address);
+ // potentially blocking operations follow; they will only run when new devices are detected, which is acceptable
+ if((res = libusb_open(dev, &handle)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not open device %d-%d: %d", bus, address, res);
+ continue;
+ }
+ int current_config = 0;
+ if((res = libusb_get_configuration(handle, &current_config)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not get configuration for device %d-%d: %d", bus, address, res);
+ libusb_close(handle);
+ continue;
+ }
+ if (current_config != devdesc.bNumConfigurations) {
+ if((res = libusb_set_configuration(handle, devdesc.bNumConfigurations)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not set configuration %d for device %d-%d: %d", devdesc.bNumConfigurations, bus, address, res);
+ libusb_close(handle);
+ continue;
+ }
+ }
+ if((res = libusb_claim_interface(handle, USB_INTERFACE)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not claim interface %d for device %d-%d: %d", USB_INTERFACE, bus, address, res);
+ libusb_close(handle);
+ continue;
+ }
+ struct usb_device *usbdev;
+ usbdev = malloc(sizeof(struct usb_device));
+
+ if((res = libusb_get_string_descriptor_ascii(handle, devdesc.iSerialNumber, (uint8_t *)usbdev->serial, 256)) <= 0) {
+ usbmuxd_log(LL_WARNING, "Could not get serial number for device %d-%d: %d", bus, address, res);
+ libusb_release_interface(handle, USB_INTERFACE);
+ libusb_close(handle);
+ free(usbdev);
+ continue;
+ }
+ usbdev->serial[res] = 0;
+ usbdev->bus = bus;
+ usbdev->address = address;
+ usbdev->vid = devdesc.idVendor;
+ usbdev->pid = devdesc.idProduct;
+ usbdev->dev = handle;
+ usbdev->alive = 1;
+ usbdev->wMaxPacketSize = 0;
+ struct libusb_config_descriptor *cfg;
+ if (libusb_get_active_config_descriptor(dev, &cfg) == 0
+ && cfg && cfg->bNumInterfaces >= (USB_INTERFACE+1)) {
+ const struct libusb_interface *ifp = &cfg->interface[USB_INTERFACE];
+ if (ifp && ifp->num_altsetting >= 1) {
+ const struct libusb_interface_descriptor *as = &ifp->altsetting[0];
+ int i;
+ for (i = 0; i < as->bNumEndpoints; i++) {
+ const struct libusb_endpoint_descriptor *ep = &as->endpoint[i];
+ if (ep->bEndpointAddress == BULK_OUT) {
+ usbdev->wMaxPacketSize = ep->wMaxPacketSize;
+ }
+ }
+ }
+ }
+ if (usbdev->wMaxPacketSize == 0) {
+ usbmuxd_log(LL_ERROR, "Could not determine wMaxPacketSize for device %d-%d, setting to 64", usbdev->bus, usbdev->address);
+ usbdev->wMaxPacketSize = 64;
+ } else {
+ usbmuxd_log(LL_INFO, "Using wMaxPacketSize=%d for device %d-%d", usbdev->wMaxPacketSize, usbdev->bus, usbdev->address);
+ }
+
+ collection_init(&usbdev->tx_xfers);
+
+ collection_add(&device_list, usbdev);
+
+ if(device_add(usbdev) < 0) {
+ usb_disconnect(usbdev);
+ continue;
+ }
+ if(start_rx(usbdev) < 0) {
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ continue;
+ }
+ valid_count++;
+ }
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ if(!usbdev->alive) {
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ }
+ } ENDFOREACH
+
+ libusb_free_device_list(devs, 1);
+
+ gettimeofday(&next_dev_poll_time, NULL);
+ next_dev_poll_time.tv_usec += DEVICE_POLL_TIME * 1000;
+ next_dev_poll_time.tv_sec += next_dev_poll_time.tv_usec / 1000000;
+ next_dev_poll_time.tv_usec = next_dev_poll_time.tv_usec % 1000000;
+
+ return valid_count;
+}
+
+const char *usb_get_serial(struct usb_device *dev)
+{
+ if(!dev->dev) {
+ return NULL;
+ }
+ return dev->serial;
+}
+
+uint32_t usb_get_location(struct usb_device *dev)
+{
+ if(!dev->dev) {
+ return 0;
+ }
+ return (dev->bus << 16) | dev->address;
+}
+
+uint16_t usb_get_pid(struct usb_device *dev)
+{
+ if(!dev->dev) {
+ return 0;
+ }
+ return dev->pid;
+}
+
+void usb_get_fds(struct fdlist *list)
+{
+ const struct libusb_pollfd **usbfds;
+ const struct libusb_pollfd **p;
+ usbfds = libusb_get_pollfds(NULL);
+ if(!usbfds) {
+ usbmuxd_log(LL_ERROR, "libusb_get_pollfds failed");
+ return;
+ }
+ p = usbfds;
+ while(*p) {
+ fdlist_add(list, FD_USB, (*p)->fd, (*p)->events);
+ p++;
+ }
+ free(usbfds);
+}
+
+static int dev_poll_remain_ms(void)
+{
+ int msecs;
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ msecs = (next_dev_poll_time.tv_sec - tv.tv_sec) * 1000;
+ msecs += (next_dev_poll_time.tv_usec - tv.tv_usec) / 1000;
+ if(msecs < 0)
+ return 0;
+ return msecs;
+}
+
+int usb_get_timeout(void)
+{
+ struct timeval tv;
+ int msec;
+ int res;
+ int pollrem;
+ pollrem = dev_poll_remain_ms();
+ res = libusb_get_next_timeout(NULL, &tv);
+ if(res == 0)
+ return pollrem;
+ if(res < 0) {
+ usbmuxd_log(LL_ERROR, "libusb_get_next_timeout failed: %d", res);
+ return pollrem;
+ }
+ msec = tv.tv_sec * 1000;
+ msec += tv.tv_usec / 1000;
+ if(msec > pollrem)
+ return pollrem;
+ return msec;
+}
+
+int usb_process(void)
+{
+ int res;
+ struct timeval tv;
+ tv.tv_sec = tv.tv_usec = 0;
+ res = libusb_handle_events_timeout(NULL, &tv);
+ if(res < 0) {
+ usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout failed: %d", res);
+ return res;
+ }
+ // reap devices marked dead due to an RX error
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ if(!usbdev->alive) {
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ }
+ } ENDFOREACH
+
+ if(dev_poll_remain_ms() <= 0) {
+ res = usb_discover();
+ if(res < 0) {
+ usbmuxd_log(LL_ERROR, "usb_discover failed: %d", res);
+ return res;
+ }
+ }
+ return 0;
+}
+
+int usb_process_timeout(int msec)
+{
+ int res;
+ struct timeval tleft, tcur, tfin;
+ gettimeofday(&tcur, NULL);
+ tfin.tv_sec = tcur.tv_sec + (msec / 1000);
+ tfin.tv_usec = tcur.tv_usec + (msec % 1000) * 1000;
+ tfin.tv_sec += tfin.tv_usec / 1000000;
+ tfin.tv_usec %= 1000000;
+ while((tfin.tv_sec > tcur.tv_sec) || ((tfin.tv_sec == tcur.tv_sec) && (tfin.tv_usec > tcur.tv_usec))) {
+ tleft.tv_sec = tfin.tv_sec - tcur.tv_sec;
+ tleft.tv_usec = tfin.tv_usec - tcur.tv_usec;
+ if(tleft.tv_usec < 0) {
+ tleft.tv_usec += 1000000;
+ tleft.tv_sec -= 1;
+ }
+ res = libusb_handle_events_timeout(NULL, &tleft);
+ if(res < 0) {
+ usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout failed: %d", res);
+ return res;
+ }
+ // reap devices marked dead due to an RX error
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ if(!usbdev->alive) {
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ }
+ } ENDFOREACH
+ gettimeofday(&tcur, NULL);
+ }
+ return 0;
+}
+
+int usb_init(void)
+{
+ int res;
+ usbmuxd_log(LL_DEBUG, "usb_init for linux / libusb 1.0");
+
+ devlist_failures = 0;
+ res = libusb_init(NULL);
+ //libusb_set_debug(NULL, 3);
+ if(res != 0) {
+ usbmuxd_log(LL_FATAL, "libusb_init failed: %d", res);
+ return -1;
+ }
+
+ collection_init(&device_list);
+
+ return usb_discover();
+}
+
+void usb_shutdown(void)
+{
+ usbmuxd_log(LL_DEBUG, "usb_shutdown");
+ FOREACH(struct usb_device *usbdev, &device_list) {
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ } ENDFOREACH
+ collection_free(&device_list);
+ libusb_exit(NULL);
+}
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