2 * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
16 #include <libubox/ustream.h>
24 #include <sys/types.h>
27 static inline int setup_tios(int fd, struct termios *oldtios)
29 struct termios newtios;
35 /* Get current termios */
36 if (tcgetattr(fd, oldtios))
41 /* We use the same settings that ssh does. */
42 newtios.c_iflag |= IGNPAR;
43 newtios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
44 newtios.c_lflag &= ~(TOSTOP | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
45 newtios.c_oflag &= ~ONLCR;
46 newtios.c_oflag |= OPOST;
47 newtios.c_cc[VMIN] = 1;
48 newtios.c_cc[VTIME] = 0;
50 /* Set new attributes */
51 if (tcsetattr(fd, TCSAFLUSH, &newtios))
59 #define OPT_ARGS "i:c:"
61 static struct ustream_fd cufd;
62 static struct ustream_fd lufd;
66 fprintf(stderr, "ujail-console -c <container> [-i <instance>]\n");
70 static void client_cb(struct ustream *s, int bytes)
76 buf = ustream_get_read_buf(s, &len);
80 rv = ustream_write(&lufd.stream, buf, len, false);
83 ustream_consume(s, rv);
90 static void local_cb(struct ustream *s, int bytes)
96 buf = ustream_get_read_buf(s, &len);
100 if ((len > 0) && (buf[0] == 2))
103 rv = ustream_write(&cufd.stream, buf, len, false);
106 ustream_consume(s, rv);
113 int main(int argc, char **argv)
115 struct ubus_context *ctx;
117 static struct blob_buf req;
118 char *container_name = NULL, *instance_name = NULL;
119 int client_fd, server_fd, tty_fd;
120 struct termios oldtermios;
123 while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
126 instance_name = optarg;
129 container_name = optarg;
139 ctx = ubus_connect(NULL);
141 fprintf(stderr, "can't connect to ubus!\n");
145 /* open pseudo-terminal pair */
146 client_fd = posix_openpt(O_RDWR | O_NOCTTY);
148 fprintf(stderr, "can't create virtual console!\n");
152 setup_tios(client_fd, &oldtermios);
155 server_fd = open(ptsname(client_fd), O_RDWR | O_NOCTTY);
157 fprintf(stderr, "can't open virtual console!\n");
163 setup_tios(server_fd, &oldtermios);
164 tty_fd = open("/dev/tty", O_RDWR);
165 setup_tios(tty_fd, &oldtermios);
167 /* register server-side with procd */
168 blob_buf_init(&req, 0);
169 blobmsg_add_string(&req, "name", container_name);
171 blobmsg_add_string(&req, "instance", instance_name);
173 if (ubus_lookup_id(ctx, "container", &id) ||
174 ubus_invoke_fd(ctx, id, "console_attach", req.head, NULL, NULL, 3000, server_fd)) {
175 fprintf(stderr, "ubus request failed\n");
189 /* forward between stdio and client_fd until detach is requested */
190 lufd.stream.notify_read = local_cb;
191 ustream_fd_init(&lufd, tty_fd);
193 cufd.stream.notify_read = client_cb;
194 /* ToDo: handle remote close and other events */
195 // cufd.stream.notify_state = client_state_cb;
196 ustream_fd_init(&cufd, client_fd);
198 fprintf(stderr, "attaching to jail console. press [CTRL]+[B] to exit.\n");
204 tcsetattr(tty_fd, TCSAFLUSH, &oldtermios);
205 ustream_free(&lufd.stream);
206 ustream_free(&cufd.stream);