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
|
/*
* wavemon - a wireless network monitoring aplication
*
* Copyright (c) 2001-2002 Jan Morgenstern <jan@jm-music.de>
*
* wavemon 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, or (at your option) any later
* version.
*
* wavemon 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 wavemon; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "wavemon.h"
#include <stdarg.h>
#if HAVE_LIBCAP
#include <sys/capability.h>
static bool has_capability(cap_value_t cap)
{
cap_t cap_proc = cap_get_proc();
cap_flag_value_t cur_val;
if (cap_get_flag(cap_proc, cap, CAP_EFFECTIVE, &cur_val))
err_sys("cap_get_flag(CAP_EFFECTIVE)");
cap_free(cap_proc);
return cur_val == CAP_SET;
}
bool has_net_admin_capability(void)
{
return has_capability(CAP_NET_ADMIN);
}
#else /* !HAVE_LIBCAP */
bool has_net_admin_capability(void)
{
return geteuid() == 0;
}
#endif
/*
* For displaying warning messages that are unrelated to system calls,
* outside ncurses mode for %WARN_DISPLAY_DELAY seconds.
*/
void err_msg(const char *format, ...)
{
va_list argp;
va_start(argp, format);
vwarnx(format, argp);
va_end(argp);
sleep(WARN_DISPLAY_DELAY);
}
/**
* terminate_all_processes - terminate wavemon and reset screen
* @fmt: printf-like format string
* @strerr: set to non-0 if termination is due to failed system call
* @ap: argument list for @fmt
*/
static void terminate_all_processes(const char *fmt, int strerr, va_list ap)
{
int saved_errno = strerr ? errno : 0;
/*
* wavemon runs in its own process group. Block TERM in this process,
* but send to all others (parent or child), which by default do not
* block TERM.
*/
xsignal(SIGTERM, SIG_IGN);
endwin();
kill(0, SIGTERM);
reset_shell_mode();
if (saved_errno) {
errno = saved_errno;
vwarn(fmt, ap);
} else {
vwarnx(fmt, ap);
}
va_end(ap);
exit(EXIT_FAILURE);
}
/*
* Abort on fatal error unrelated to system call.
*/
void err_quit(const char *format, ...)
{
va_list argp;
va_start(argp, format);
terminate_all_processes(format, false, argp);
}
/*
* Abort on fatal error related to system call.
*/
void err_sys(const char *format, ...)
{
va_list argp;
va_start(argp, format);
terminate_all_processes(format, true, argp);
}
|
