/* * wavemon - a wireless network monitoring aplication * * Copyright (c) 2001-2002 Jan Morgenstern * * 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 #if HAVE_LIBCAP #include 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); }

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