/*
 * 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);
}
99cf1488f583b2065c3163f0c23c21fc1baecb2&amp;showmsg=1&amp;follow=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2002-08-19 10:51:06 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/M50530.c?h=master&amp;id=7ed47d0ee20b96f16955a71bc3fcf3dad607bcfb&amp;follow=1'>[lcd4linux @ 2002-08-19 10:51:06 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-259</span>/<span class='insertions'>+60</span></td></tr>
<tr><td><span title='2002-08-19 09:43:43 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/BeckmannEgle.c?h=master&amp;id=1b5ce6fb9be2a5e199442c5227bb456ee588a6d4&amp;follow=1'>[lcd4linux @ 2002-08-19 09:43:43 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-261</span>/<span class='insertions'>+57</span></td></tr>
<tr><td><span title='2002-08-19 09:30:18 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/MatrixOrbital.c?h=master&amp;id=0a222223da77df452af54599d7229737f23a4979&amp;follow=1'>[lcd4linux @ 2002-08-19 09:30:18 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-256</span>/<span class='insertions'>+106</span></td></tr>
<tr><td><span title='2002-08-19 09:11:34 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/USBLCD.c?h=master&amp;id=ea9550a25fe75ddbe92ff807df0b7a2cdf9affca&amp;follow=1'>[lcd4linux @ 2002-08-19 09:11:34 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-257</span>/<span class='insertions'>+51</span></td></tr>
<tr><td><span title='2002-08-19 07:52:19 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/bar.h?h=master&amp;id=2e0aea4d5beae921b86b259adddae549955db036&amp;follow=1'>[lcd4linux @ 2002-08-19 07:52:19 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-8</span>/<span class='insertions'>+17</span></td></tr>
<tr><td><span title='2002-08-19 07:36:29 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/bar.h?h=master&amp;id=3459cefb2dcd1736f50e8134fdc2518aa8edc402&amp;follow=1'>[lcd4linux @ 2002-08-19 07:36:29 by reinelt]</a></td><td>reinelt</td><td>7</td><td><span class='deletions'>-359</span>/<span class='insertions'>+481</span></td></tr>
<tr><td><span title='2002-08-19 04:41:20 +0000'>2002-08-19</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=d72755a9609479f9b3463a96c3a71fd7084f2fb3&amp;follow=1'>[lcd4linux @ 2002-08-19 04:41:20 by reinelt]</a></td><td>reinelt</td><td>20</td><td><span class='deletions'>-32</span>/<span class='insertions'>+166</span></td></tr>
<tr><td><span title='2002-08-18 08:11:11 +0000'>2002-08-18</span></td><td><a href='/lcd4linux.git/commit/USBLCD.c?h=master&amp;id=0d5e6f24b79e5127a66db4cf1e4155424ba26ded&amp;follow=1'>[lcd4linux @ 2002-08-18 08:11:11 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-26</span>/<span class='insertions'>+28</span></td></tr>
<tr><td><span title='2002-08-17 14:14:21 +0000'>2002-08-17</span></td><td><a href='/lcd4linux.git/commit/udelay.c?h=master&amp;id=35755c86f661f8af41911331567e7fd4520cdfe7&amp;follow=1'>[lcd4linux @ 2002-08-17 14:14:21 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-67</span>/<span class='insertions'>+101</span></td></tr>
<tr><td><span title='2002-08-17 13:10:23 +0000'>2002-08-17</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?h=master&amp;id=38316eabe17ef143a2951b72c7cdd318b99a6c71&amp;follow=1'>[lcd4linux @ 2002-08-17 13:10:22 by reinelt]</a></td><td>reinelt</td><td>9</td><td><span class='deletions'>-182</span>/<span class='insertions'>+765</span></td></tr>
<tr><td><span title='2002-08-17 12:54:08 +0000'>2002-08-17</span></td><td><a href='/lcd4linux.git/commit/T6963.c?h=master&amp;id=bbdb125fd6cdaf4acae3459b1b0e42e66bb9e96f&amp;follow=1'>[lcd4linux @ 2002-08-17 12:54:08 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+23</span></td></tr>
<tr><td><span title='2002-04-30 07:20:15 +0000'>2002-04-30</span></td><td><a href='/lcd4linux.git/commit/M50530.c?h=master&amp;id=55ca707f900b9df3a701129017e7ab85d243c94c&amp;follow=1'>[lcd4linux @ 2002-04-30 07:20:15 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-173</span>/<span class='insertions'>+129</span></td></tr>
<tr><td><span title='2002-04-29 11:00:28 +0000'>2002-04-29</span></td><td><a href='/lcd4linux.git/commit/udelay.h?h=master&amp;id=e0bc8f47b964169bcbec3ce14d1aca38bc024cee&amp;follow=1'>[lcd4linux @ 2002-04-29 11:00:25 by reinelt]</a></td><td>reinelt</td><td>14</td><td><span class='deletions'>-2339</span>/<span class='insertions'>+5100</span></td></tr>
<tr><td><span title='2001-09-14 05:57:06 +0000'>2001-09-14</span></td><td><a href='/lcd4linux.git/commit/TODO?h=master&amp;id=c9a403a8364c906a54c24a9465299bb7e45e53f6&amp;follow=1'>[lcd4linux @ 2001-09-14 05:57:06 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+5</span></td></tr>
<tr><td><span title='2001-09-13 07:40:57 +0000'>2001-09-13</span></td><td><a href='/lcd4linux.git/commit/TODO?h=master&amp;id=f54b102fdb2005e01be18a40d2952a13b442931b&amp;follow=1'>[lcd4linux @ 2001-09-13 07:40:57 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+6</span></td></tr>
<tr><td><span title='2001-09-12 06:17:22 +0000'>2001-09-12</span></td><td><a href='/lcd4linux.git/commit/mail2.c?h=master&amp;id=5d9989113b56376af1c7707b8a67088c44d42020&amp;follow=1'>[lcd4linux @ 2001-09-12 06:17:22 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-1</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2001-09-12 05:58:16 +0000'>2001-09-12</span></td><td><a href='/lcd4linux.git/commit/socket.c?h=master&amp;id=3e02257318034a35959a9680159f1c99399fa0f7&amp;follow=1'>[lcd4linux @ 2001-09-12 05:58:16 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-9</span>/<span class='insertions'>+27</span></td></tr>
<tr><td><span title='2001-09-12 05:37:22 +0000'>2001-09-12</span></td><td><a href='/lcd4linux.git/commit/socket.c?h=master&amp;id=4340dc126ba0920dc93c0e74d48cfee769547399&amp;follow=1'>[lcd4linux @ 2001-09-12 05:37:22 by reinelt]</a></td><td>reinelt</td><td>4</td><td><span class='deletions'>-23</span>/<span class='insertions'>+99</span></td></tr>
<tr><td><span title='2001-09-11 06:43:43 +0000'>2001-09-11</span></td><td><a href='/lcd4linux.git/commit/TODO?h=master&amp;id=9e49a79d95a7c61099ab86b6106d98a77b66a79e&amp;follow=1'>[lcd4linux @ 2001-09-11 06:43:43 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+10</span></td></tr>