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/*
* Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* 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.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <fcntl.h>
#include <libubox/ustream.h>
#include <libubus.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <termios.h>
static inline int setup_tios(int fd, struct termios *oldtios)
{
struct termios newtios;
if (!isatty(fd)) {
return -1;
}
/* Get current termios */
if (tcgetattr(fd, oldtios))
return -1;
newtios = *oldtios;
/* We use the same settings that ssh does. */
newtios.c_iflag |= IGNPAR;
newtios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
newtios.c_lflag &= ~(TOSTOP | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
newtios.c_oflag &= ~ONLCR;
newtios.c_oflag |= OPOST;
newtios.c_cc[VMIN] = 1;
newtios.c_cc[VTIME] = 0;
/* Set new attributes */
if (tcsetattr(fd, TCSAFLUSH, &newtios))
return -1;
return 0;
}
#define OPT_ARGS "i:c:"
static struct ustream_fd cufd;
static struct ustream_fd lufd;
static void usage()
{
fprintf(stderr, "ujail-console -c <container> [-i <instance>]\n");
exit(1);
}
static void client_cb(struct ustream *s, int bytes)
{
char *buf;
int len, rv;
do {
buf = ustream_get_read_buf(s, &len);
if (!buf)
break;
rv = ustream_write(&lufd.stream, buf, len, false);
if (rv > 0)
ustream_consume(s, rv);
if (rv <= len)
break;
} while(1);
}
static void local_cb(struct ustream *s, int bytes)
{
char *buf;
int len, rv;
do {
buf = ustream_get_read_buf(s, &len);
if (!buf)
break;
if ((len > 0) && (buf[0] == 2))
uloop_end();
rv = ustream_write(&cufd.stream, buf, len, false);
if (rv > 0)
ustream_consume(s, rv);
if (rv <= len)
break;
} while(1);
}
int main(int argc, char **argv)
{
struct ubus_context *ctx;
uint32_t id;
static struct blob_buf req;
char *container_name = NULL, *instance_name = NULL;
int client_fd, server_fd, tty_fd;
struct termios oldtermios;
int ch;
while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
switch (ch) {
case 'i':
instance_name = optarg;
break;
case 'c':
container_name = optarg;
break;
default:
usage();
}
}
if (!container_name)
usage();
ctx = ubus_connect(NULL);
if (!ctx) {
fprintf(stderr, "can't connect to ubus!\n");
return -1;
}
/* open pseudo-terminal pair */
client_fd = posix_openpt(O_RDWR | O_NOCTTY);
if (client_fd < 0) {
fprintf(stderr, "can't create virtual console!\n");
ubus_free(ctx);
return -1;
}
setup_tios(client_fd, &oldtermios);
grantpt(client_fd);
unlockpt(client_fd);
server_fd = open(ptsname(client_fd), O_RDWR | O_NOCTTY);
if (server_fd < 0) {
fprintf(stderr, "can't open virtual console!\n");
close(client_fd);
ubus_free(ctx);
return -1;
}
setup_tios(server_fd, &oldtermios);
tty_fd = open("/dev/tty", O_RDWR);
setup_tios(tty_fd, &oldtermios);
/* register server-side with procd */
blob_buf_init(&req, 0);
blobmsg_add_string(&req, "name", container_name);
if (instance_name)
blobmsg_add_string(&req, "instance", instance_name);
if (ubus_lookup_id(ctx, "container", &id) ||
ubus_invoke_fd(ctx, id, "console_attach", req.head, NULL, NULL, 3000, server_fd)) {
fprintf(stderr, "ubus request failed\n");
close(server_fd);
close(client_fd);
blob_buf_free(&req);
ubus_free(ctx);
return -2;
}
close(server_fd);
blob_buf_free(&req);
ubus_free(ctx);
uloop_init();
/* forward between stdio and client_fd until detach is requested */
lufd.stream.notify_read = local_cb;
ustream_fd_init(&lufd, tty_fd);
cufd.stream.notify_read = client_cb;
/* ToDo: handle remote close and other events */
// cufd.stream.notify_state = client_state_cb;
ustream_fd_init(&cufd, client_fd);
fprintf(stderr, "attaching to jail console. press [CTRL]+[B] to exit.\n");
close(0);
close(1);
close(2);
uloop_run();
tcsetattr(tty_fd, TCSAFLUSH, &oldtermios);
ustream_free(&lufd.stream);
ustream_free(&cufd.stream);
close(client_fd);
return 0;
}
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