1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Authors: William Jon McCann <mccann@jhu.edu>
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <X11/Xlib.h>
#include <glib.h>
#include "ck-sysdeps.h"
static char *
get_tty_for_pid (int pid)
{
GError *error;
char *device;
gboolean res;
CkProcessStat *xorg_stat;
error = NULL;
res = ck_process_stat_new_for_unix_pid (pid, &xorg_stat, &error);
if (! res) {
if (error != NULL) {
g_warning ("stat on pid %d failed: %s", pid, error->message);
g_error_free (error);
}
/* keep the tty value */
return NULL;
}
device = ck_process_stat_get_tty (xorg_stat);
ck_process_stat_free (xorg_stat);
return device;
}
static int
get_peer_pid (int fd)
{
int pid = -1;
#ifdef SO_PEERCRED
struct ucred cr;
socklen_t cr_len;
cr_len = sizeof (cr);
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 && cr_len == sizeof (cr)) {
/* paranoia check for peer running as root */
if (cr.uid == 0) {
pid = cr.pid;
}
} else {
g_warning ("Failed to getsockopt() credentials, returned len %d/%d: %s\n",
cr_len,
(int) sizeof (cr),
g_strerror (errno));
}
#endif
return pid;
}
static Display *
display_init (const char *display_name)
{
Display *xdisplay;
if (display_name == NULL) {
display_name = g_getenv ("DISPLAY");
}
if (display_name == NULL) {
g_warning ("DISPLAY is not set");
exit (1);
}
xdisplay = XOpenDisplay (display_name);
if (xdisplay == NULL) {
g_warning ("cannot open display: %s", display_name ? display_name : "");
exit (1);
}
return xdisplay;
}
int
main (int argc,
char **argv)
{
int fd;
int ret;
Display *xdisplay;
static char *display = NULL;
GError *error;
GOptionContext *context;
static GOptionEntry entries [] = {
{ "display", 0, 0, G_OPTION_ARG_STRING, &display, "display name", NULL },
{ NULL }
};
ret = 1;
context = g_option_context_new (NULL);
g_option_context_add_main_entries (context, entries, NULL);
error = NULL;
ret = g_option_context_parse (context, &argc, &argv, &error);
g_option_context_free (context);
xdisplay = display_init (display);
fd = ConnectionNumber (xdisplay);
if (fd > 0) {
int pid;
char *device;
ret = 0;
pid = get_peer_pid (fd);
if (pid != -1) {
device = get_tty_for_pid (pid);
if (device != NULL) {
printf ("%s\n", device);
g_free (device);
}
}
}
return ret;
}
|
