From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/um/drivers/port_user.c | 201 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 201 insertions(+)
 create mode 100644 arch/um/drivers/port_user.c

(limited to 'arch/um/drivers/port_user.c')

diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c
new file mode 100644
index 000000000..9a8e1b64c
--- /dev/null
+++ b/arch/um/drivers/port_user.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <termios.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include "chan_user.h"
+#include <os.h>
+#include "port.h"
+#include <um_malloc.h>
+
+struct port_chan {
+	int raw;
+	struct termios tt;
+	void *kernel_data;
+	char dev[sizeof("32768\0")];
+};
+
+static void *port_init(char *str, int device, const struct chan_opts *opts)
+{
+	struct port_chan *data;
+	void *kern_data;
+	char *end;
+	int port;
+
+	if (*str != ':') {
+		printk(UM_KERN_ERR "port_init : channel type 'port' must "
+		       "specify a port number\n");
+		return NULL;
+	}
+	str++;
+	port = strtoul(str, &end, 0);
+	if ((*end != '\0') || (end == str)) {
+		printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n",
+		       str);
+		return NULL;
+	}
+
+	kern_data = port_data(port);
+	if (kern_data == NULL)
+		return NULL;
+
+	data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+	if (data == NULL)
+		goto err;
+
+	*data = ((struct port_chan) { .raw  		= opts->raw,
+				      .kernel_data 	= kern_data });
+	sprintf(data->dev, "%d", port);
+
+	return data;
+ err:
+	port_kern_free(kern_data);
+	return NULL;
+}
+
+static void port_free(void *d)
+{
+	struct port_chan *data = d;
+
+	port_kern_free(data->kernel_data);
+	kfree(data);
+}
+
+static int port_open(int input, int output, int primary, void *d,
+		     char **dev_out)
+{
+	struct port_chan *data = d;
+	int fd, err;
+
+	fd = port_wait(data->kernel_data);
+	if ((fd >= 0) && data->raw) {
+		CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+		if (err)
+			return err;
+
+		err = raw(fd);
+		if (err)
+			return err;
+	}
+	*dev_out = data->dev;
+	return fd;
+}
+
+static void port_close(int fd, void *d)
+{
+	struct port_chan *data = d;
+
+	port_remove_dev(data->kernel_data);
+	os_close_file(fd);
+}
+
+const struct chan_ops port_ops = {
+	.type		= "port",
+	.init		= port_init,
+	.open		= port_open,
+	.close		= port_close,
+	.read	        = generic_read,
+	.write		= generic_write,
+	.console_write	= generic_console_write,
+	.window_size	= generic_window_size,
+	.free		= port_free,
+	.winch		= 1,
+};
+
+int port_listen_fd(int port)
+{
+	struct sockaddr_in addr;
+	int fd, err, arg;
+
+	fd = socket(PF_INET, SOCK_STREAM, 0);
+	if (fd == -1)
+		return -errno;
+
+	arg = 1;
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) {
+		err = -errno;
+		goto out;
+	}
+
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(port);
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+		err = -errno;
+		goto out;
+	}
+
+	if (listen(fd, 1) < 0) {
+		err = -errno;
+		goto out;
+	}
+
+	err = os_set_fd_block(fd, 0);
+	if (err < 0)
+		goto out;
+
+	return fd;
+ out:
+	close(fd);
+	return err;
+}
+
+struct port_pre_exec_data {
+	int sock_fd;
+	int pipe_fd;
+};
+
+static void port_pre_exec(void *arg)
+{
+	struct port_pre_exec_data *data = arg;
+
+	dup2(data->sock_fd, 0);
+	dup2(data->sock_fd, 1);
+	dup2(data->sock_fd, 2);
+	close(data->sock_fd);
+	dup2(data->pipe_fd, 3);
+	shutdown(3, SHUT_RD);
+	close(data->pipe_fd);
+}
+
+int port_connection(int fd, int *socket, int *pid_out)
+{
+	int new, err;
+	char *argv[] = { "/usr/sbin/in.telnetd", "-L",
+			 "/usr/lib/uml/port-helper", NULL };
+	struct port_pre_exec_data data;
+
+	new = accept(fd, NULL, 0);
+	if (new < 0)
+		return -errno;
+
+	err = os_pipe(socket, 0, 0);
+	if (err < 0)
+		goto out_close;
+
+	data = ((struct port_pre_exec_data)
+		{ .sock_fd  		= new,
+		  .pipe_fd 		= socket[1] });
+
+	err = run_helper(port_pre_exec, &data, argv);
+	if (err < 0)
+		goto out_shutdown;
+
+	*pid_out = err;
+	return new;
+
+ out_shutdown:
+	shutdown(socket[0], SHUT_RDWR);
+	close(socket[0]);
+	shutdown(socket[1], SHUT_RDWR);
+	close(socket[1]);
+ out_close:
+	close(new);
+	return err;
+}
-- 
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