Initial revision
This commit is contained in:
Ivo Timmermans
commit
1243156a5e
87 changed files with 27214 additions and 0 deletions
468
src/tincd.c
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468
src/tincd.c
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/*
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tincd.c -- the main file for tincd
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Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
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This program 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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "config.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#include <pidfile.h>
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#include <utils.h>
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#include <xalloc.h>
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#include "conf.h"
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#include "encr.h"
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#include "net.h"
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#include "netutl.h"
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/* The name this program was run with. */
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char *program_name;
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/* If nonzero, display usage information and exit. */
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static int show_help;
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/* If nonzero, print the version on standard output and exit. */
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static int show_version;
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/* If nonzero, it will attempt to kill a running tincd and exit. */
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static int kill_tincd = 0;
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char *confbase = NULL; /* directory in which all config files are */
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char *configfilename = NULL; /* configuration file name */
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char *identname; /* program name for syslog */
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char *netname = NULL; /* name of the vpn network */
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char *pidfilename; /* pid file location */
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static pid_t ppid; /* pid of non-detached part */
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char **g_argv; /* a copy of the cmdline arguments */
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void cleanup_and_exit(int);
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int detach(void);
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int kill_other(void);
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void make_names(void);
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RETSIGTYPE parent_exit(int a);
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void setup_signals(void);
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int write_pidfile(void);
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static struct option const long_options[] =
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{
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{ "kill", no_argument, NULL, 'k' },
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{ "net", required_argument, NULL, 'n' },
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{ "timeout", required_argument, NULL, 'p' },
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{ "help", no_argument, &show_help, 1 },
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{ "version", no_argument, &show_version, 1 },
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{ NULL, 0, NULL, 0 }
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};
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static void
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usage(int status)
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{
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if(status != 0)
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fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
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else
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{
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printf("Usage: %s [option]...\n\n", program_name);
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printf(" -c, --config=FILE Read configuration options from FILE.\n"
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" -d Increase debug level.\n"
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" -k, --kill Attempt to kill a running tincd and exit.\n"
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" -n, --net=NETNAME Connect to net NETNAME.\n"
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" -t, --timeout=TIMEOUT Seconds to wait before giving a timeout.\n");
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printf(" --help Display this help and exit.\n"
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" --version Output version information and exit.\n\n");
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printf("Report bugs to zarq@iname.com.\n");
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}
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exit(status);
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}
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void
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parse_options(int argc, char **argv, char **envp)
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{
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int r;
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int option_index = 0;
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config_t *p;
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while((r = getopt_long(argc, argv, "c:dkn:t:", long_options, &option_index)) != EOF)
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{
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switch(r)
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{
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case 0: /* long option */
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break;
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case 'c': /* config file */
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configfilename = xmalloc(strlen(optarg)+1);
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strcpy(configfilename, optarg);
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break;
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case 'd': /* inc debug level */
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debug_lvl++;
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break;
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case 'k': /* kill old tincds */
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kill_tincd = 1;
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break;
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case 'n': /* net name given */
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netname = xmalloc(strlen(optarg)+1);
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strcpy(netname, optarg);
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break;
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case 't': /* timeout */
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if(!(p = add_config_val(&config, TYPE_INT, optarg)))
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{
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printf("Invalid timeout value `%s'.\n", optarg);
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usage(1);
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}
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break;
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case '?':
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usage(1);
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default:
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break;
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}
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}
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}
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void memory_full(void)
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{
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syslog(LOG_ERR, "Memory exhausted; exiting.");
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exit(1);
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}
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/*
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Detach from current terminal, write pidfile, kill parent
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*/
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int detach(void)
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{
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int fd;
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pid_t pid;
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ppid = getpid();
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if((pid = fork()) < 0)
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{
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perror("fork");
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return -1;
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}
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if(pid) /* parent process */
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{
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signal(SIGTERM, parent_exit);
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sleep(600); /* wait 10 minutes */
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exit(1);
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}
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if(write_pidfile())
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return -1;
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if((fd = open("/dev/tty", O_RDWR)) >= 0)
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{
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if(ioctl(fd, TIOCNOTTY, NULL))
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{
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perror("ioctl");
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return -1;
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}
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close(fd);
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}
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kill(ppid, SIGTERM);
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if(setsid() < 0)
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return -1;
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chdir("/"); /* avoid keeping a mointpoint busy */
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openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
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if(debug_lvl > 1)
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syslog(LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d.",
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VERSION, __DATE__, __TIME__, debug_lvl);
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else
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syslog(LOG_NOTICE, "tincd %s starting, debug level %d.", VERSION, debug_lvl);
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xalloc_fail_func = memory_full;
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return 0;
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}
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/*
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Close network connections, and terminate neatly
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*/
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void cleanup_and_exit(int c)
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{
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close_network_connections();
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if(debug_lvl > 0)
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syslog(LOG_INFO, "Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d.",
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total_tap_out, total_socket_out, total_tap_in, total_socket_in);
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closelog();
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kill(ppid, SIGTERM);
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exit(c);
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}
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/*
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check for an existing tinc for this net, and write pid to pidfile
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*/
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int write_pidfile(void)
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{
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int pid;
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if((pid = check_pid(pidfilename)))
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{
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if(netname)
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fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n",
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netname, pid);
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else
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fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
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return 1;
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}
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/* if it's locked, write-protected, or whatever */
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if(!write_pid(pidfilename))
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return 1;
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return 0;
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}
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/*
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kill older tincd for this net
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*/
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int kill_other(void)
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{
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int pid;
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if(!(pid = read_pid(pidfilename)))
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{
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if(netname)
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fprintf(stderr, "No other tincd is running for net `%s'.\n", netname);
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else
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fprintf(stderr, "No other tincd is running.\n");
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return 1;
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}
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errno = 0; /* No error, sometimes errno is only changed on error */
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/* ESRCH is returned when no process with that pid is found */
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if(kill(pid, SIGTERM) && errno == ESRCH)
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fprintf(stderr, "Removing stale lock file.\n");
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remove_pid(pidfilename);
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return 0;
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}
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/*
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Set all files and paths according to netname
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*/
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void make_names(void)
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{
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if(!configfilename)
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{
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if(netname)
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{
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configfilename = xmalloc(strlen(netname)+18+strlen(CONFDIR));
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sprintf(configfilename, "%s/tinc/%s/tincd.conf", CONFDIR, netname);
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}
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else
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{
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configfilename = xmalloc(17+strlen(CONFDIR));
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sprintf(configfilename, "%s/tinc/tincd.conf", CONFDIR);
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}
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}
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if(netname)
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{
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pidfilename = xmalloc(strlen(netname)+20);
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sprintf(pidfilename, "/var/run/tincd.%s.pid", netname);
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confbase = xmalloc(strlen(netname)+8+strlen(CONFDIR));
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sprintf(confbase, "%s/tinc/%s/", CONFDIR, netname);
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identname = xmalloc(strlen(netname)+7);
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sprintf(identname, "tincd.%s", netname);
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}
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else
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{
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pidfilename = "/var/run/tincd.pid";
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confbase = xmalloc(7+strlen(CONFDIR));
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sprintf(confbase, "%s/tinc/", CONFDIR);
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identname = "tincd";
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}
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}
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int
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main(int argc, char **argv, char **envp)
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{
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program_name = argv[0];
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parse_options(argc, argv, envp);
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if(show_version)
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{
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printf("%s version %s\nCopyright (C) 1998,99 Ivo Timmermans and others,\n"
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"see the AUTHORS file for a complete list.\n\n"
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"tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
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"and you are welcome to redistribute it under certain conditions;\n"
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"see the file COPYING for details.\n\n", PACKAGE, VERSION);
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printf("This product includes software developed by Eric Young (eay@mincom.oz.au)\n");
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return 0;
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}
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if(show_help)
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usage(0);
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if(geteuid())
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{
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fprintf(stderr, "You must be root to run this program. sorry.\n");
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return 1;
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}
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g_argv = argv;
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make_names();
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if(kill_tincd)
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exit(kill_other());
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if(read_config_file(configfilename))
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return 1;
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setup_signals();
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if(detach())
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cleanup_and_exit(1);
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if(security_init())
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return 1;
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if(setup_network_connections())
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cleanup_and_exit(1);
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main_loop();
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cleanup_and_exit(1);
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return 1;
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}
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RETSIGTYPE
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sigterm_handler(int a)
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{
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if(debug_lvl > 0)
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syslog(LOG_NOTICE, "Got TERM signal");
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cleanup_and_exit(0);
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}
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RETSIGTYPE
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sigquit_handler(int a)
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{
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if(debug_lvl > 0)
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syslog(LOG_NOTICE, "Got QUIT signal");
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cleanup_and_exit(0);
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}
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RETSIGTYPE
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sigsegv_square(int a)
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{
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syslog(LOG_NOTICE, "Got another SEGV signal: not restarting");
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exit(0);
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}
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RETSIGTYPE
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sigsegv_handler(int a)
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{
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if(cp_file)
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syslog(LOG_NOTICE, "Got SEGV signal after %s line %d. Trying to re-execute.",
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cp_file, cp_line);
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else
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syslog(LOG_NOTICE, "Got SEGV signal; trying to re-execute.");
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signal(SIGSEGV, sigsegv_square);
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close_network_connections();
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remove_pid(pidfilename);
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execvp(g_argv[0], g_argv);
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}
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RETSIGTYPE
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sighup_handler(int a)
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{
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if(debug_lvl > 0)
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syslog(LOG_NOTICE, "Got HUP signal");
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close_network_connections();
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setup_network_connections();
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/* FIXME: read config-file and re-establish network connections */
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}
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RETSIGTYPE
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sigint_handler(int a)
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{
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if(debug_lvl > 0)
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syslog(LOG_NOTICE, "Got INT signal");
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cleanup_and_exit(0);
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}
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RETSIGTYPE
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sigusr1_handler(int a)
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{
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dump_conn_list();
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}
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RETSIGTYPE
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sigusr2_handler(int a)
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{
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if(debug_lvl > 1)
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syslog(LOG_NOTICE, "Forcing new keys");
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regenerate_keys();
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}
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RETSIGTYPE
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sighuh(int a)
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{
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if(cp_file)
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syslog(LOG_NOTICE, "Got unexpected signal after %s line %d.",
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cp_file, cp_line);
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else
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syslog(LOG_NOTICE, "Got unexpected signal.");
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}
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void
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setup_signals(void)
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{
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int i;
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for(i=0;i<32;i++)
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signal(i,sighuh);
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if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
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signal(SIGTERM, sigterm_handler);
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if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
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signal(SIGQUIT, sigquit_handler);
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if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
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signal(SIGSEGV, sigsegv_handler);
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if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
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signal(SIGHUP, sighup_handler);
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signal(SIGPIPE, SIG_IGN);
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if(signal(SIGINT, SIG_IGN) != SIG_ERR)
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signal(SIGINT, sigint_handler);
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signal(SIGUSR1, sigusr1_handler);
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signal(SIGUSR2, sigusr2_handler);
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}
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RETSIGTYPE parent_exit(int a)
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{
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exit(0);
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}
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