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b0a33c1e | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <dlezcano at fr.ibm.com> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <stdio.h> | |
25 | #include <unistd.h> | |
26 | #include <errno.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/un.h> | |
29 | ||
724e753c | 30 | #include <lxc/lxc.h> |
96fa1ff0 | 31 | #include "commands.h" |
724e753c | 32 | #include "af_unix.h" |
36eb9bde CLG |
33 | |
34 | lxc_log_define(lxc_console, lxc); | |
35 | ||
96fa1ff0 MN |
36 | extern int lxc_console(const char *name, int ttynum, int *fd) |
37 | { | |
d97b36f8 | 38 | int ret, stopped = 0; |
96fa1ff0 MN |
39 | struct lxc_command command = { |
40 | .request = { .type = LXC_COMMAND_TTY, .data = ttynum }, | |
41 | }; | |
42 | ||
d97b36f8 DL |
43 | ret = lxc_command(name, &command, &stopped); |
44 | if (ret < 0 && stopped) { | |
45 | ERROR("'%s' is stopped", name); | |
46 | return -1; | |
47 | } | |
48 | ||
96fa1ff0 MN |
49 | if (ret < 0) { |
50 | ERROR("failed to send command"); | |
51 | return -1; | |
52 | } | |
53 | ||
54 | if (!ret) { | |
55 | ERROR("console denied by '%s'", name); | |
56 | return -1; | |
57 | } | |
58 | ||
3cc5de36 MN |
59 | if (command.answer.ret) { |
60 | ERROR("console access denied: %s", | |
61 | strerror(-command.answer.ret)); | |
62 | return -1; | |
63 | } | |
64 | ||
96fa1ff0 MN |
65 | *fd = command.answer.fd; |
66 | if (*fd <0) { | |
67 | ERROR("unable to allocate fd for tty %d", ttynum); | |
68 | return -1; | |
69 | } | |
70 | ||
71 | INFO("tty %d allocated", ttynum); | |
72 | return 0; | |
73 | } | |
724e753c MN |
74 | |
75 | /*---------------------------------------------------------------------------- | |
76 | * functions used by lxc-start mainloop | |
77 | * to handle above command request. | |
78 | *--------------------------------------------------------------------------*/ | |
79 | extern void lxc_console_remove_fd(int fd, struct lxc_tty_info *tty_info) | |
80 | { | |
81 | int i; | |
82 | ||
83 | for (i = 0; i < tty_info->nbtty; i++) { | |
84 | ||
85 | if (tty_info->pty_info[i].busy != fd) | |
86 | continue; | |
87 | ||
88 | tty_info->pty_info[i].busy = 0; | |
89 | } | |
90 | ||
91 | return; | |
92 | } | |
93 | ||
94 | extern int lxc_console_callback(int fd, struct lxc_request *request, | |
95 | struct lxc_handler *handler) | |
96 | { | |
97 | int ttynum = request->data; | |
571e6ec8 | 98 | struct lxc_tty_info *tty_info = &handler->conf.tty_info; |
724e753c MN |
99 | |
100 | if (ttynum > 0) { | |
101 | if (ttynum > tty_info->nbtty) | |
102 | goto out_close; | |
103 | ||
104 | if (tty_info->pty_info[ttynum - 1].busy) | |
105 | goto out_close; | |
106 | ||
107 | goto out_send; | |
108 | } | |
109 | ||
110 | /* fixup index tty1 => [0] */ | |
111 | for (ttynum = 1; | |
112 | ttynum <= tty_info->nbtty && tty_info->pty_info[ttynum - 1].busy; | |
113 | ttynum++); | |
114 | ||
115 | /* we didn't find any available slot for tty */ | |
116 | if (ttynum > tty_info->nbtty) | |
117 | goto out_close; | |
118 | ||
119 | out_send: | |
120 | if (lxc_af_unix_send_fd(fd, tty_info->pty_info[ttynum - 1].master, | |
121 | &ttynum, sizeof(ttynum)) < 0) { | |
122 | ERROR("failed to send tty to client"); | |
123 | goto out_close; | |
124 | } | |
125 | ||
126 | tty_info->pty_info[ttynum - 1].busy = fd; | |
127 | ||
128 | return 0; | |
129 | ||
130 | out_close: | |
131 | /* the close fd and related cleanup will be done by caller */ | |
132 | return 1; | |
133 | } | |
134 |