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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.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 *env;
char *argv[] = { "in.telnetd", "-L",
OS_LIB_PATH "/uml/port-helper", NULL };
struct port_pre_exec_data data;
if ((env = getenv("UML_PORT_HELPER")))
argv[2] = env;
new = accept(fd, NULL, 0);
if (new < 0)
return -errno;
err = os_access(argv[2], X_OK);
if (err < 0) {
printk(UM_KERN_ERR "port_connection : error accessing port-helper "
"executable at %s: %s\n", argv[2], strerror(-err));
if (env == NULL)
printk(UM_KERN_ERR "Set UML_PORT_HELPER environment "
"variable to path to uml-utilities port-helper "
"binary\n");
goto out_close;
}
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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