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/* |
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util.C -- process management and other utility functions |
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Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
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|
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Some of these are taken from tinc, see the AUTHORS file. |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <cstdio> |
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#include <cstdlib> |
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#include <cstring> |
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|
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#include <errno.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <unistd.h> |
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#include <time.h> |
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|
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#include "netcompat.h" |
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|
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#include "gettext.h" |
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#include "pidfile.h" |
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#include "dropin.h" |
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|
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#include "global.h" |
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#include "conf.h" |
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#include "util.h" |
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#include "slog.h" |
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|
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int |
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write_pidfile (void) |
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{ |
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int pid; |
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|
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pid = check_pid (conf.pidfilename); |
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|
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if (pid) |
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{ |
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fprintf (stderr, _("A gvpe daemon is already running with pid %d.\n"), pid); |
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return 1; |
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} |
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|
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/* if it's locked, write-protected, or whatever */ |
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if (!write_pid (conf.pidfilename)) |
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return 1; |
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|
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return 0; |
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} |
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|
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int |
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kill_other (int signal) |
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{ |
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int pid; |
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|
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pid = read_pid (conf.pidfilename); |
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|
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if (!pid) |
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{ |
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fprintf (stderr, _("No other gvpe daemon is running.\n")); |
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return 1; |
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} |
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|
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errno = 0; /* No error, sometimes errno is only changed on error */ |
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|
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/* ESRCH is returned when no process with that pid is found */ |
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if (kill (pid, signal) && errno == ESRCH) |
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{ |
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fprintf (stderr, _("The gvpe daemon is no longer running. ")); |
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|
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fprintf (stderr, _("Removing stale lock file.\n")); |
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remove_pid (conf.pidfilename); |
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} |
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|
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return 0; |
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} |
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|
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int |
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detach (int do_detach) |
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{ |
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/* First check if we can open a fresh new pidfile */ |
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|
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if (write_pidfile ()) |
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return -1; |
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|
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/* If we succeeded in doing that, detach */ |
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|
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log_to (0); |
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|
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if (do_detach) |
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{ |
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if (daemon (0, 0) < 0) |
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{ |
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log_to (LOGTO_SYSLOG | LOGTO_STDERR); |
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|
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slog (L_ERR, _("couldn't detach from terminal: %s"), strerror (errno)); |
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return -1; |
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} |
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|
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/* Now UPDATE the pid in the pidfile, because we changed it... */ |
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|
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if (!write_pid (conf.pidfilename)) |
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return -1; |
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|
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log_to (LOGTO_SYSLOG); |
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} |
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else |
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log_to (LOGTO_SYSLOG | LOGTO_STDERR); |
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|
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slog (L_INFO, _("gvpe daemon %s (%s %s) starting"), VERSION, __DATE__, __TIME__); |
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|
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return 0; |
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} |
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|
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bool run_script (const run_script_cb &cb, bool wait) |
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{ |
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if (wait) |
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signal (SIGCHLD, SIG_DFL); // this is extremely ugly, but I did not feel like implementing a complete wait() event logic. It's easier to write this long comment to make your editor happy. |
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|
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int pid = fork (); |
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|
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if (pid == 0) |
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{ |
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execl ("/bin/sh", "/bin/sh", "-c", cb (), (char *) 0); |
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exit (EXIT_FAILURE); |
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} |
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else if (pid > 0) |
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{ |
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if (wait) |
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{ |
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int status; |
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int res = waitpid (pid, &status, 0); |
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|
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signal (SIGCHLD, SIG_IGN); |
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|
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if (res < 0) |
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{ |
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slog (L_WARN, _("waiting for an external command failed: %s."), |
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strerror (errno)); |
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return false; |
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} |
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else if (!WIFEXITED (status) || WEXITSTATUS (status) != EXIT_SUCCESS) |
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{ |
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slog (L_WARN, _("external command returned with exit status %d (%04x)."), |
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WEXITSTATUS (status), status); |
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return false; |
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} |
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} |
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} |
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else |
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{ |
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slog (L_ERR, _("unable to fork, exiting: %s"), strerror (errno)); |
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exit (EXIT_FAILURE); |
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} |
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|
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return true; |
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} |
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|
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#if ENABLE_HTTP_PROXY |
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// works like strdup |
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u8 * |
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base64_encode (const u8 *data, unsigned int len) |
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{ |
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const static char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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|
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unsigned int t, i; |
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const u8 *end = data + len; |
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u8 *res = new u8 [4 * ((len + 2) / 3) + 1]; |
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u8 *out = res; |
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|
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while (data <= end - 3) |
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{ |
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t = (((data[0] << 8) | data[1]) << 8) | data[2]; |
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data += 3; |
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|
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*out++ = base64[(t >> 18) & 0x3f]; |
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*out++ = base64[(t >> 12) & 0x3f]; |
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*out++ = base64[(t >> 6) & 0x3f]; |
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*out++ = base64[(t ) & 0x3f]; |
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} |
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|
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for (t = 0, i = 0; data < end; i++) |
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t = (t << 8) | *data++; |
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|
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switch (i) |
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{ |
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case 2: |
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*out++ = base64[(t >> 10) & 0x3f]; |
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*out++ = base64[(t >> 4) & 0x3f]; |
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*out++ = base64[(t << 2) & 0x3f]; |
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*out++ = '='; |
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break; |
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case 1: |
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*out++ = base64[(t >> 2) & 0x3f]; |
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*out++ = base64[(t << 4) & 0x3f]; |
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*out++ = '='; |
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*out++ = '='; |
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break; |
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} |
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|
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*out++ = 0; |
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|
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return res; |
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} |
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#endif |
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|
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void |
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id2mac (unsigned int id, void *m) |
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{ |
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mac &p = *(mac *)m; |
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|
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if (id) |
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{ |
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p[0] = 0xfe; |
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p[1] = 0xfd; |
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p[2] = 0x80; |
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p[3] = 0x00; |
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p[4] = id >> 8; |
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p[5] = id; |
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} |
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else |
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{ |
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p[0] = 0xff; |
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p[1] = 0xff; |
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p[2] = 0xff; |
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p[3] = 0xff; |
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p[4] = 0xff; |
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p[5] = 0xff; |
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} |
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} |
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|
