Compilable rusb for linux

1 files changed, 0 insertions, 401 deletions

diff --git a/src/os/linux_netlink.c b/src/os/linux_netlink.c
deleted file mode 100644
index 899084f..0000000
--- a/src/os/linux_netlink.c
+++ /dev/null
@@ -1,401 +0,0 @@
-/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
-/*
- * Linux 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>
- * Copyright (c) 2016 Chris Dickens <christopher.a.dickens@gmail.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
- */
-
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <pthread.h>
-#include <string.h>
-#include <unistd.h>
-
-#ifdef HAVE_ASM_TYPES_H
-#include <asm/types.h>
-#endif
-#include <sys/socket.h>
-#include <linux/netlink.h>
-
-#define NL_GROUP_KERNEL 1
-
-#ifndef SOCK_CLOEXEC
-#define SOCK_CLOEXEC	0
-#endif
-
-#ifndef SOCK_NONBLOCK
-#define SOCK_NONBLOCK	0
-#endif
-
-static int linux_netlink_socket = -1;
-static usbi_event_t netlink_control_event = USBI_INVALID_EVENT;
-static pthread_t libusb_linux_event_thread;
-
-static void *linux_netlink_event_thread_main(void *arg);
-
-static int set_fd_cloexec_nb(int fd, int socktype)
-{
-	int flags;
-
-#if defined(FD_CLOEXEC)
-	/* Make sure the netlink socket file descriptor is marked as CLOEXEC */
-	if (!(socktype & SOCK_CLOEXEC)) {
-		flags = fcntl(fd, F_GETFD);
-		if (flags == -1) {
-			usbi_err(NULL, "failed to get netlink fd flags, errno=%d", errno);
-			return -1;
-		}
-
-		if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
-			usbi_err(NULL, "failed to set netlink fd flags, errno=%d", errno);
-			return -1;
-		}
-	}
-#endif
-
-	/* Make sure the netlink socket is non-blocking */
-	if (!(socktype & SOCK_NONBLOCK)) {
-		flags = fcntl(fd, F_GETFL);
-		if (flags == -1) {
-			usbi_err(NULL, "failed to get netlink fd status flags, errno=%d", errno);
-			return -1;
-		}
-
-		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
-			usbi_err(NULL, "failed to set netlink fd status flags, errno=%d", errno);
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
-int linux_netlink_start_event_monitor(void)
-{
-	struct sockaddr_nl sa_nl = { .nl_family = AF_NETLINK, .nl_groups = NL_GROUP_KERNEL };
-	int socktype = SOCK_RAW | SOCK_NONBLOCK | SOCK_CLOEXEC;
-	int opt = 1;
-	int ret;
-
-	linux_netlink_socket = socket(PF_NETLINK, socktype, NETLINK_KOBJECT_UEVENT);
-	if (linux_netlink_socket == -1 && errno == EINVAL) {
-		usbi_dbg(NULL, "failed to create netlink socket of type %d, attempting SOCK_RAW", socktype);
-		socktype = SOCK_RAW;
-		linux_netlink_socket = socket(PF_NETLINK, socktype, NETLINK_KOBJECT_UEVENT);
-	}
-
-	if (linux_netlink_socket == -1) {
-		usbi_err(NULL, "failed to create netlink socket, errno=%d", errno);
-		goto err;
-	}
-
-	ret = set_fd_cloexec_nb(linux_netlink_socket, socktype);
-	if (ret == -1)
-		goto err_close_socket;
-
-	ret = bind(linux_netlink_socket, (struct sockaddr *)&sa_nl, sizeof(sa_nl));
-	if (ret == -1) {
-		usbi_err(NULL, "failed to bind netlink socket, errno=%d", errno);
-		goto err_close_socket;
-	}
-
-	ret = setsockopt(linux_netlink_socket, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt));
-	if (ret == -1) {
-		usbi_err(NULL, "failed to set netlink socket SO_PASSCRED option, errno=%d", errno);
-		goto err_close_socket;
-	}
-
-	ret = usbi_create_event(&netlink_control_event);
-	if (ret) {
-		usbi_err(NULL, "failed to create netlink control event");
-		goto err_close_socket;
-	}
-
-	ret = pthread_create(&libusb_linux_event_thread, NULL, linux_netlink_event_thread_main, NULL);
-	if (ret != 0) {
-		usbi_err(NULL, "failed to create netlink event thread (%d)", ret);
-		goto err_destroy_event;
-	}
-
-	return LIBUSB_SUCCESS;
-
-err_destroy_event:
-	usbi_destroy_event(&netlink_control_event);
-	netlink_control_event = (usbi_event_t)USBI_INVALID_EVENT;
-err_close_socket:
-	close(linux_netlink_socket);
-	linux_netlink_socket = -1;
-err:
-	return LIBUSB_ERROR_OTHER;
-}
-
-int linux_netlink_stop_event_monitor(void)
-{
-	int ret;
-
-	assert(linux_netlink_socket != -1);
-
-	/* Signal the control event and wait for the thread to exit */
-	usbi_signal_event(&netlink_control_event);
-
-	ret = pthread_join(libusb_linux_event_thread, NULL);
-	if (ret)
-		usbi_warn(NULL, "failed to join netlink event thread (%d)", ret);
-
-	usbi_destroy_event(&netlink_control_event);
-	netlink_control_event = (usbi_event_t)USBI_INVALID_EVENT;
-
-	close(linux_netlink_socket);
-	linux_netlink_socket = -1;
-
-	return LIBUSB_SUCCESS;
-}
-
-static const char *netlink_message_parse(const char *buffer, size_t len, const char *key)
-{
-	const char *end = buffer + len;
-	size_t keylen = strlen(key);
-
-	while (buffer < end && *buffer) {
-		if (strncmp(buffer, key, keylen) == 0 && buffer[keylen] == '=')
-			return buffer + keylen + 1;
-		buffer += strlen(buffer) + 1;
-	}
-
-	return NULL;
-}
-
-/* parse parts of netlink message common to both libudev and the kernel */
-static int linux_netlink_parse(const char *buffer, size_t len, int *detached,
-	const char **sys_name, uint8_t *busnum, uint8_t *devaddr)
-{
-	const char *tmp, *slash;
-
-	errno = 0;
-
-	*sys_name = NULL;
-	*detached = 0;
-	*busnum   = 0;
-	*devaddr  = 0;
-
-	tmp = netlink_message_parse(buffer, len, "ACTION");
-	if (!tmp) {
-		return -1;
-	} else if (strcmp(tmp, "remove") == 0) {
-		*detached = 1;
-	} else if (strcmp(tmp, "add") != 0) {
-		usbi_dbg(NULL, "unknown device action %s", tmp);
-		return -1;
-	}
-
-	/* check that this is a usb message */
-	tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
-	if (!tmp || strcmp(tmp, "usb") != 0) {
-		/* not usb. ignore */
-		return -1;
-	}
-
-	/* check that this is an actual usb device */
-	tmp = netlink_message_parse(buffer, len, "DEVTYPE");
-	if (!tmp || strcmp(tmp, "usb_device") != 0) {
-		/* not usb. ignore */
-		return -1;
-	}
-
-	tmp = netlink_message_parse(buffer, len, "BUSNUM");
-	if (tmp) {
-		*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;
-		}
-	} else {
-		/* no bus number. try "DEVICE" */
-		tmp = netlink_message_parse(buffer, len, "DEVICE");
-		if (!tmp) {
-			/* not usb. ignore */
-			return -1;
-		}
-
-		/* Parse a device path such as /dev/bus/usb/003/004 */
-		slash = strrchr(tmp, '/');
-		if (!slash)
-			return -1;
-
-		*busnum = (uint8_t)(strtoul(slash - 3, NULL, 10) & 0xff);
-		if (errno) {
-			errno = 0;
-			return -1;
-		}
-
-		*devaddr = (uint8_t)(strtoul(slash + 1, NULL, 10) & 0xff);
-		if (errno) {
-			errno = 0;
-			return -1;
-		}
-
-		return 0;
-	}
-
-	tmp = netlink_message_parse(buffer, len, "DEVPATH");
-	if (!tmp)
-		return -1;
-
-	slash = strrchr(tmp, '/');
-	if (slash)
-		*sys_name = slash + 1;
-
-	/* found a usb device */
-	return 0;
-}
-
-static int linux_netlink_read_message(void)
-{
-	char cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
-	char msg_buffer[2048];
-	const char *sys_name = NULL;
-	uint8_t busnum, devaddr;
-	int detached, r;
-	ssize_t len;
-	struct cmsghdr *cmsg;
-	struct ucred *cred;
-	struct sockaddr_nl sa_nl;
-	struct iovec iov = { .iov_base = msg_buffer, .iov_len = sizeof(msg_buffer) };
-	struct msghdr msg = {
-		.msg_iov = &iov, .msg_iovlen = 1,
-		.msg_control = cred_buffer, .msg_controllen = sizeof(cred_buffer),
-		.msg_name = &sa_nl, .msg_namelen = sizeof(sa_nl)
-	};
-
-	/* read netlink message */
-	len = recvmsg(linux_netlink_socket, &msg, 0);
-	if (len == -1) {
-		if (errno != EAGAIN && errno != EINTR)
-			usbi_err(NULL, "error receiving message from netlink, errno=%d", errno);
-		return -1;
-	}
-
-	if (len < 32 || (msg.msg_flags & MSG_TRUNC)) {
-		usbi_err(NULL, "invalid netlink message length");
-		return -1;
-	}
-
-	if (sa_nl.nl_groups != NL_GROUP_KERNEL || sa_nl.nl_pid != 0) {
-		usbi_dbg(NULL, "ignoring netlink message from unknown group/PID (%u/%u)",
-			 (unsigned int)sa_nl.nl_groups, (unsigned int)sa_nl.nl_pid);
-		return -1;
-	}
-
-	cmsg = CMSG_FIRSTHDR(&msg);
-	if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) {
-		usbi_dbg(NULL, "ignoring netlink message with no sender credentials");
-		return -1;
-	}
-
-	cred = (struct ucred *)CMSG_DATA(cmsg);
-	if (cred->uid != 0) {
-		usbi_dbg(NULL, "ignoring netlink message with non-zero sender UID %u", (unsigned int)cred->uid);
-		return -1;
-	}
-
-	r = linux_netlink_parse(msg_buffer, (size_t)len, &detached, &sys_name, &busnum, &devaddr);
-	if (r)
-		return r;
-
-	usbi_dbg(NULL, "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)
-		linux_device_disconnected(busnum, devaddr);
-	else
-		linux_hotplug_enumerate(busnum, devaddr, sys_name);
-
-	return 0;
-}
-
-static void *linux_netlink_event_thread_main(void *arg)
-{
-	struct pollfd fds[] = {
-		{ .fd = USBI_EVENT_OS_HANDLE(&netlink_control_event),
-		  .events = USBI_EVENT_POLL_EVENTS },
-		{ .fd = linux_netlink_socket,
-		  .events = POLLIN },
-	};
-	int r;
-
-	UNUSED(arg);
-
-#if defined(HAVE_PTHREAD_SETNAME_NP)
-	r = pthread_setname_np(pthread_self(), "libusb_event");
-	if (r)
-		usbi_warn(NULL, "failed to set hotplug event thread name, error=%d", r);
-#endif
-
-	usbi_dbg(NULL, "netlink event thread entering");
-
-	while (1) {
-		r = poll(fds, 2, -1);
-		if (r == -1) {
-			/* check for temporary failure */
-			if (errno == EINTR)
-				continue;
-			usbi_err(NULL, "poll() failed, errno=%d", errno);
-			break;
-		}
-		if (fds[0].revents) {
-			/* activity on control event, exit */
-			break;
-		}
-		if (fds[1].revents) {
-			usbi_mutex_static_lock(&linux_hotplug_lock);
-			linux_netlink_read_message();
-			usbi_mutex_static_unlock(&linux_hotplug_lock);
-		}
-	}
-
-	usbi_dbg(NULL, "netlink event thread exiting");
-
-	return NULL;
-}
-
-void linux_netlink_hotplug_poll(void)
-{
-	int r;
-
-	usbi_mutex_static_lock(&linux_hotplug_lock);
-	do {
-		r = linux_netlink_read_message();
-	} while (r == 0);
-	usbi_mutex_static_unlock(&linux_hotplug_lock);
-}