xref: /freebsd/usr.sbin/ppp/main.c (revision 29e275cee418456291f32a11083b960aea8c7f6e)
11ae349f5Scvs2svn /*
21ae349f5Scvs2svn  *			User Process PPP
31ae349f5Scvs2svn  *
41ae349f5Scvs2svn  *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
51ae349f5Scvs2svn  *
61ae349f5Scvs2svn  *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
71ae349f5Scvs2svn  *
81ae349f5Scvs2svn  * Redistribution and use in source and binary forms are permitted
91ae349f5Scvs2svn  * provided that the above copyright notice and this paragraph are
101ae349f5Scvs2svn  * duplicated in all such forms and that any documentation,
111ae349f5Scvs2svn  * advertising materials, and other materials related to such
121ae349f5Scvs2svn  * distribution and use acknowledge that the software was developed
131ae349f5Scvs2svn  * by the Internet Initiative Japan, Inc.  The name of the
141ae349f5Scvs2svn  * IIJ may not be used to endorse or promote products derived
151ae349f5Scvs2svn  * from this software without specific prior written permission.
161ae349f5Scvs2svn  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
171ae349f5Scvs2svn  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
181ae349f5Scvs2svn  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
191ae349f5Scvs2svn  *
2029e275ceSBrian Somers  * $Id: main.c,v 1.121.2.1 1998/01/29 00:49:26 brian Exp $
211ae349f5Scvs2svn  *
221ae349f5Scvs2svn  *	TODO:
231ae349f5Scvs2svn  *		o Add commands for traffic summary, version display, etc.
241ae349f5Scvs2svn  *		o Add signal handler for misc controls.
251ae349f5Scvs2svn  */
261ae349f5Scvs2svn #include <sys/param.h>
271ae349f5Scvs2svn #include <sys/time.h>
281ae349f5Scvs2svn #include <sys/select.h>
291ae349f5Scvs2svn #include <sys/socket.h>
301ae349f5Scvs2svn #include <net/if.h>
311ae349f5Scvs2svn #include <net/if_tun.h>
321ae349f5Scvs2svn #include <netinet/in.h>
331ae349f5Scvs2svn #include <netinet/in_systm.h>
341ae349f5Scvs2svn #include <netinet/ip.h>
351ae349f5Scvs2svn #include <arpa/inet.h>
361ae349f5Scvs2svn 
371ae349f5Scvs2svn #include <errno.h>
381ae349f5Scvs2svn #include <fcntl.h>
391ae349f5Scvs2svn #include <paths.h>
401ae349f5Scvs2svn #include <signal.h>
411ae349f5Scvs2svn #include <stdio.h>
421ae349f5Scvs2svn #include <stdlib.h>
431ae349f5Scvs2svn #include <string.h>
441ae349f5Scvs2svn #include <sys/time.h>
451ae349f5Scvs2svn #include <sys/wait.h>
461ae349f5Scvs2svn #include <termios.h>
471ae349f5Scvs2svn #include <unistd.h>
481ae349f5Scvs2svn 
491ae349f5Scvs2svn #include "command.h"
501ae349f5Scvs2svn #include "mbuf.h"
511ae349f5Scvs2svn #include "log.h"
521ae349f5Scvs2svn #include "defs.h"
531ae349f5Scvs2svn #include "id.h"
541ae349f5Scvs2svn #include "timer.h"
551ae349f5Scvs2svn #include "fsm.h"
561ae349f5Scvs2svn #include "modem.h"
571ae349f5Scvs2svn #include "os.h"
581ae349f5Scvs2svn #include "hdlc.h"
591ae349f5Scvs2svn #include "lcp.h"
601ae349f5Scvs2svn #include "ccp.h"
6129e275ceSBrian Somers #include "iplist.h"
6229e275ceSBrian Somers #include "throughput.h"
631ae349f5Scvs2svn #include "ipcp.h"
641ae349f5Scvs2svn #include "loadalias.h"
651ae349f5Scvs2svn #include "vars.h"
661ae349f5Scvs2svn #include "auth.h"
671ae349f5Scvs2svn #include "filter.h"
681ae349f5Scvs2svn #include "systems.h"
691ae349f5Scvs2svn #include "ip.h"
701ae349f5Scvs2svn #include "sig.h"
711ae349f5Scvs2svn #include "server.h"
721ae349f5Scvs2svn #include "main.h"
731ae349f5Scvs2svn #include "vjcomp.h"
741ae349f5Scvs2svn #include "async.h"
751ae349f5Scvs2svn #include "pathnames.h"
761ae349f5Scvs2svn #include "tun.h"
771ae349f5Scvs2svn #include "route.h"
7863b73463SBrian Somers #include "physical.h"
791ae349f5Scvs2svn 
801ae349f5Scvs2svn #ifndef O_NONBLOCK
811ae349f5Scvs2svn #ifdef O_NDELAY
821ae349f5Scvs2svn #define	O_NONBLOCK O_NDELAY
831ae349f5Scvs2svn #endif
841ae349f5Scvs2svn #endif
851ae349f5Scvs2svn 
861ae349f5Scvs2svn int TermMode = 0;
871ae349f5Scvs2svn int tunno = 0;
881ae349f5Scvs2svn 
891ae349f5Scvs2svn static struct termios oldtio;	/* Original tty mode */
901ae349f5Scvs2svn static struct termios comtio;	/* Command level tty mode */
911ae349f5Scvs2svn static pid_t BGPid = 0;
921ae349f5Scvs2svn static char pid_filename[MAXPATHLEN];
931ae349f5Scvs2svn static int dial_up;
941ae349f5Scvs2svn 
951ae349f5Scvs2svn static void DoLoop(void);
961ae349f5Scvs2svn static void TerminalStop(int);
971ae349f5Scvs2svn static const char *ex_desc(int);
981ae349f5Scvs2svn 
991ae349f5Scvs2svn static void
1001ae349f5Scvs2svn TtyInit(int DontWantInt)
1011ae349f5Scvs2svn {
1021ae349f5Scvs2svn   struct termios newtio;
1031ae349f5Scvs2svn   int stat;
1041ae349f5Scvs2svn 
1051ae349f5Scvs2svn   stat = fcntl(netfd, F_GETFL, 0);
1061ae349f5Scvs2svn   if (stat > 0) {
1071ae349f5Scvs2svn     stat |= O_NONBLOCK;
1081ae349f5Scvs2svn     (void) fcntl(netfd, F_SETFL, stat);
1091ae349f5Scvs2svn   }
1101ae349f5Scvs2svn   newtio = oldtio;
1111ae349f5Scvs2svn   newtio.c_lflag &= ~(ECHO | ISIG | ICANON);
1121ae349f5Scvs2svn   newtio.c_iflag = 0;
1131ae349f5Scvs2svn   newtio.c_oflag &= ~OPOST;
1141ae349f5Scvs2svn   newtio.c_cc[VEOF] = _POSIX_VDISABLE;
1151ae349f5Scvs2svn   if (DontWantInt)
1161ae349f5Scvs2svn     newtio.c_cc[VINTR] = _POSIX_VDISABLE;
1171ae349f5Scvs2svn   newtio.c_cc[VMIN] = 1;
1181ae349f5Scvs2svn   newtio.c_cc[VTIME] = 0;
1191ae349f5Scvs2svn   newtio.c_cflag |= CS8;
1201ae349f5Scvs2svn   tcsetattr(netfd, TCSANOW, &newtio);
1211ae349f5Scvs2svn   comtio = newtio;
1221ae349f5Scvs2svn }
1231ae349f5Scvs2svn 
1241ae349f5Scvs2svn /*
1251ae349f5Scvs2svn  *  Set tty into command mode. We allow canonical input and echo processing.
1261ae349f5Scvs2svn  */
1271ae349f5Scvs2svn void
1281ae349f5Scvs2svn TtyCommandMode(int prompt)
1291ae349f5Scvs2svn {
1301ae349f5Scvs2svn   struct termios newtio;
1311ae349f5Scvs2svn   int stat;
1321ae349f5Scvs2svn 
1331ae349f5Scvs2svn   if (!(mode & MODE_INTER))
1341ae349f5Scvs2svn     return;
1351ae349f5Scvs2svn   tcgetattr(netfd, &newtio);
1361ae349f5Scvs2svn   newtio.c_lflag |= (ECHO | ISIG | ICANON);
1371ae349f5Scvs2svn   newtio.c_iflag = oldtio.c_iflag;
1381ae349f5Scvs2svn   newtio.c_oflag |= OPOST;
1391ae349f5Scvs2svn   tcsetattr(netfd, TCSADRAIN, &newtio);
1401ae349f5Scvs2svn   stat = fcntl(netfd, F_GETFL, 0);
1411ae349f5Scvs2svn   if (stat > 0) {
1421ae349f5Scvs2svn     stat |= O_NONBLOCK;
1431ae349f5Scvs2svn     (void) fcntl(netfd, F_SETFL, stat);
1441ae349f5Scvs2svn   }
1451ae349f5Scvs2svn   TermMode = 0;
1461ae349f5Scvs2svn   if (prompt)
1471ae349f5Scvs2svn     Prompt();
1481ae349f5Scvs2svn }
1491ae349f5Scvs2svn 
1501ae349f5Scvs2svn /*
1511ae349f5Scvs2svn  * Set tty into terminal mode which is used while we invoke term command.
1521ae349f5Scvs2svn  */
1531ae349f5Scvs2svn void
1541ae349f5Scvs2svn TtyTermMode()
1551ae349f5Scvs2svn {
1561ae349f5Scvs2svn   int stat;
1571ae349f5Scvs2svn 
1581ae349f5Scvs2svn   tcsetattr(netfd, TCSADRAIN, &comtio);
1591ae349f5Scvs2svn   stat = fcntl(netfd, F_GETFL, 0);
1601ae349f5Scvs2svn   if (stat > 0) {
1611ae349f5Scvs2svn     stat &= ~O_NONBLOCK;
1621ae349f5Scvs2svn     (void) fcntl(netfd, F_SETFL, stat);
1631ae349f5Scvs2svn   }
1641ae349f5Scvs2svn   TermMode = 1;
1651ae349f5Scvs2svn }
1661ae349f5Scvs2svn 
1671ae349f5Scvs2svn void
1681ae349f5Scvs2svn TtyOldMode()
1691ae349f5Scvs2svn {
1701ae349f5Scvs2svn   int stat;
1711ae349f5Scvs2svn 
1721ae349f5Scvs2svn   stat = fcntl(netfd, F_GETFL, 0);
1731ae349f5Scvs2svn   if (stat > 0) {
1741ae349f5Scvs2svn     stat &= ~O_NONBLOCK;
1751ae349f5Scvs2svn     (void) fcntl(netfd, F_SETFL, stat);
1761ae349f5Scvs2svn   }
1771ae349f5Scvs2svn   tcsetattr(netfd, TCSADRAIN, &oldtio);
1781ae349f5Scvs2svn }
1791ae349f5Scvs2svn 
1801ae349f5Scvs2svn void
1811ae349f5Scvs2svn Cleanup(int excode)
1821ae349f5Scvs2svn {
1831ae349f5Scvs2svn   DropClient(1);
1841ae349f5Scvs2svn   ServerClose();
1851ae349f5Scvs2svn   OsInterfaceDown(1);
18663b73463SBrian Somers   HangupModem(pppVars.physical, 1); /* XXX must be expanded to
18763b73463SBrian Somers 				       take all modems */
1881ae349f5Scvs2svn   nointr_sleep(1);
1891ae349f5Scvs2svn   DeleteIfRoutes(1);
1901ae349f5Scvs2svn   ID0unlink(pid_filename);
1911ae349f5Scvs2svn   if (mode & MODE_BACKGROUND && BGFiledes[1] != -1) {
1921ae349f5Scvs2svn     char c = EX_ERRDEAD;
1931ae349f5Scvs2svn 
1941ae349f5Scvs2svn     if (write(BGFiledes[1], &c, 1) == 1)
1951ae349f5Scvs2svn       LogPrintf(LogPHASE, "Parent notified of failure.\n");
1961ae349f5Scvs2svn     else
1971ae349f5Scvs2svn       LogPrintf(LogPHASE, "Failed to notify parent of failure.\n");
1981ae349f5Scvs2svn     close(BGFiledes[1]);
1991ae349f5Scvs2svn   }
2001ae349f5Scvs2svn   LogPrintf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
2011ae349f5Scvs2svn   TtyOldMode();
2021ae349f5Scvs2svn   LogClose();
2031ae349f5Scvs2svn 
2041ae349f5Scvs2svn   exit(excode);
2051ae349f5Scvs2svn }
2061ae349f5Scvs2svn 
2071ae349f5Scvs2svn static void
2081ae349f5Scvs2svn CloseConnection(int signo)
2091ae349f5Scvs2svn {
2101ae349f5Scvs2svn   /* NOTE, these are manual, we've done a setsid() */
2111ae349f5Scvs2svn   pending_signal(SIGINT, SIG_IGN);
2121ae349f5Scvs2svn   LogPrintf(LogPHASE, "Caught signal %d, abort connection\n", signo);
2131ae349f5Scvs2svn   reconnectState = RECON_FALSE;
2141ae349f5Scvs2svn   reconnectCount = 0;
2151ae349f5Scvs2svn   DownConnection();
2161ae349f5Scvs2svn   dial_up = 0;
2171ae349f5Scvs2svn   pending_signal(SIGINT, CloseConnection);
2181ae349f5Scvs2svn }
2191ae349f5Scvs2svn 
2201ae349f5Scvs2svn static void
2211ae349f5Scvs2svn CloseSession(int signo)
2221ae349f5Scvs2svn {
2231ae349f5Scvs2svn   if (BGPid) {
2241ae349f5Scvs2svn     kill(BGPid, SIGINT);
2251ae349f5Scvs2svn     exit(EX_TERM);
2261ae349f5Scvs2svn   }
2271ae349f5Scvs2svn   LogPrintf(LogPHASE, "Signal %d, terminate.\n", signo);
2281ae349f5Scvs2svn   reconnect(RECON_FALSE);
22963b73463SBrian Somers   LcpClose(&LcpFsm);
2301ae349f5Scvs2svn   Cleanup(EX_TERM);
2311ae349f5Scvs2svn }
2321ae349f5Scvs2svn 
2331ae349f5Scvs2svn static void
2341ae349f5Scvs2svn TerminalCont(int signo)
2351ae349f5Scvs2svn {
2361ae349f5Scvs2svn   pending_signal(SIGCONT, SIG_DFL);
2371ae349f5Scvs2svn   pending_signal(SIGTSTP, TerminalStop);
2381ae349f5Scvs2svn   TtyCommandMode(getpgrp() == tcgetpgrp(netfd));
2391ae349f5Scvs2svn }
2401ae349f5Scvs2svn 
2411ae349f5Scvs2svn static void
2421ae349f5Scvs2svn TerminalStop(int signo)
2431ae349f5Scvs2svn {
2441ae349f5Scvs2svn   pending_signal(SIGCONT, TerminalCont);
2451ae349f5Scvs2svn   TtyOldMode();
2461ae349f5Scvs2svn   pending_signal(SIGTSTP, SIG_DFL);
2471ae349f5Scvs2svn   kill(getpid(), signo);
2481ae349f5Scvs2svn }
2491ae349f5Scvs2svn 
2501ae349f5Scvs2svn static void
2511ae349f5Scvs2svn SetUpServer(int signo)
2521ae349f5Scvs2svn {
2531ae349f5Scvs2svn   int res;
2541ae349f5Scvs2svn 
2551ae349f5Scvs2svn   VarHaveLocalAuthKey = 0;
2561ae349f5Scvs2svn   LocalAuthInit();
2571ae349f5Scvs2svn   if ((res = ServerTcpOpen(SERVER_PORT + tunno)) != 0)
2581ae349f5Scvs2svn     LogPrintf(LogERROR, "SIGUSR1: Failed %d to open port %d\n",
2591ae349f5Scvs2svn 	      res, SERVER_PORT + tunno);
2601ae349f5Scvs2svn }
2611ae349f5Scvs2svn 
2621ae349f5Scvs2svn static void
2631ae349f5Scvs2svn BringDownServer(int signo)
2641ae349f5Scvs2svn {
2651ae349f5Scvs2svn   VarHaveLocalAuthKey = 0;
2661ae349f5Scvs2svn   LocalAuthInit();
2671ae349f5Scvs2svn   ServerClose();
2681ae349f5Scvs2svn }
2691ae349f5Scvs2svn 
2701ae349f5Scvs2svn static const char *
2711ae349f5Scvs2svn ex_desc(int ex)
2721ae349f5Scvs2svn {
2731ae349f5Scvs2svn   static char num[12];
2741ae349f5Scvs2svn   static const char *desc[] = {
2751ae349f5Scvs2svn     "normal", "start", "sock", "modem", "dial", "dead", "done",
2761ae349f5Scvs2svn     "reboot", "errdead", "hangup", "term", "nodial", "nologin"
2771ae349f5Scvs2svn   };
2781ae349f5Scvs2svn 
2791ae349f5Scvs2svn   if (ex >= 0 && ex < sizeof desc / sizeof *desc)
2801ae349f5Scvs2svn     return desc[ex];
2811ae349f5Scvs2svn   snprintf(num, sizeof num, "%d", ex);
2821ae349f5Scvs2svn   return num;
2831ae349f5Scvs2svn }
2841ae349f5Scvs2svn 
2851ae349f5Scvs2svn static void
2861ae349f5Scvs2svn Usage(void)
2871ae349f5Scvs2svn {
2881ae349f5Scvs2svn   fprintf(stderr,
2891ae349f5Scvs2svn 	  "Usage: ppp [-auto | -background | -direct | -dedicated | -ddial ]"
2901ae349f5Scvs2svn #ifndef NOALIAS
2911ae349f5Scvs2svn           " [ -alias ]"
2921ae349f5Scvs2svn #endif
2931ae349f5Scvs2svn           " [system]\n");
2941ae349f5Scvs2svn   exit(EX_START);
2951ae349f5Scvs2svn }
2961ae349f5Scvs2svn 
2971ae349f5Scvs2svn static char *
2981ae349f5Scvs2svn ProcessArgs(int argc, char **argv)
2991ae349f5Scvs2svn {
3001ae349f5Scvs2svn   int optc;
3011ae349f5Scvs2svn   char *cp;
3021ae349f5Scvs2svn 
3031ae349f5Scvs2svn   optc = 0;
3041ae349f5Scvs2svn   mode = MODE_INTER;
3051ae349f5Scvs2svn   while (argc > 0 && **argv == '-') {
3061ae349f5Scvs2svn     cp = *argv + 1;
3071ae349f5Scvs2svn     if (strcmp(cp, "auto") == 0) {
3081ae349f5Scvs2svn       mode |= MODE_AUTO;
3091ae349f5Scvs2svn       mode &= ~MODE_INTER;
3101ae349f5Scvs2svn     } else if (strcmp(cp, "background") == 0) {
3111ae349f5Scvs2svn       mode |= MODE_BACKGROUND;
3121ae349f5Scvs2svn       mode &= ~MODE_INTER;
3131ae349f5Scvs2svn     } else if (strcmp(cp, "direct") == 0) {
3141ae349f5Scvs2svn       mode |= MODE_DIRECT;
3151ae349f5Scvs2svn       mode &= ~MODE_INTER;
3161ae349f5Scvs2svn     } else if (strcmp(cp, "dedicated") == 0) {
3171ae349f5Scvs2svn       mode |= MODE_DEDICATED;
3181ae349f5Scvs2svn       mode &= ~MODE_INTER;
3191ae349f5Scvs2svn     } else if (strcmp(cp, "ddial") == 0) {
3201ae349f5Scvs2svn       mode |= MODE_DDIAL;
3211ae349f5Scvs2svn       mode &= ~MODE_INTER;
3221ae349f5Scvs2svn #ifndef NOALIAS
3231ae349f5Scvs2svn     } else if (strcmp(cp, "alias") == 0) {
3241ae349f5Scvs2svn       if (loadAliasHandlers(&VarAliasHandlers) == 0)
3251ae349f5Scvs2svn 	mode |= MODE_ALIAS;
3261ae349f5Scvs2svn       else
3271ae349f5Scvs2svn 	LogPrintf(LogWARN, "Cannot load alias library\n");
3281ae349f5Scvs2svn       optc--;			/* this option isn't exclusive */
3291ae349f5Scvs2svn #endif
3301ae349f5Scvs2svn     } else
3311ae349f5Scvs2svn       Usage();
3321ae349f5Scvs2svn     optc++;
3331ae349f5Scvs2svn     argv++;
3341ae349f5Scvs2svn     argc--;
3351ae349f5Scvs2svn   }
3361ae349f5Scvs2svn   if (argc > 1) {
3371ae349f5Scvs2svn     fprintf(stderr, "specify only one system label.\n");
3381ae349f5Scvs2svn     exit(EX_START);
3391ae349f5Scvs2svn   }
3401ae349f5Scvs2svn 
3411ae349f5Scvs2svn   if (optc > 1) {
3421ae349f5Scvs2svn     fprintf(stderr, "specify only one mode.\n");
3431ae349f5Scvs2svn     exit(EX_START);
3441ae349f5Scvs2svn   }
3451ae349f5Scvs2svn 
3461ae349f5Scvs2svn   return argc == 1 ? *argv : NULL;	/* Don't SetLabel yet ! */
3471ae349f5Scvs2svn }
3481ae349f5Scvs2svn 
3491ae349f5Scvs2svn int
3501ae349f5Scvs2svn main(int argc, char **argv)
3511ae349f5Scvs2svn {
3521ae349f5Scvs2svn   FILE *lockfile;
3531ae349f5Scvs2svn   char *name, *label;
3541ae349f5Scvs2svn   int nfds;
3551ae349f5Scvs2svn 
3561ae349f5Scvs2svn   nfds = getdtablesize();
3571ae349f5Scvs2svn   if (nfds >= FD_SETSIZE)
3581ae349f5Scvs2svn     /*
3591ae349f5Scvs2svn      * If we've got loads of file descriptors, make sure they're all
3601ae349f5Scvs2svn      * closed.  If they aren't, we may end up with a seg fault when our
3611ae349f5Scvs2svn      * `fd_set's get too big when select()ing !
3621ae349f5Scvs2svn      */
3631ae349f5Scvs2svn     while (--nfds > 2)
3641ae349f5Scvs2svn       close(nfds);
3651ae349f5Scvs2svn 
3661ae349f5Scvs2svn   VarTerm = 0;
3671ae349f5Scvs2svn   name = strrchr(argv[0], '/');
3681ae349f5Scvs2svn   LogOpen(name ? name + 1 : argv[0]);
3691ae349f5Scvs2svn 
3701ae349f5Scvs2svn   tcgetattr(STDIN_FILENO, &oldtio);	/* Save original tty mode */
3711ae349f5Scvs2svn 
3721ae349f5Scvs2svn   argc--;
3731ae349f5Scvs2svn   argv++;
3741ae349f5Scvs2svn   label = ProcessArgs(argc, argv);
3751ae349f5Scvs2svn   if (!(mode & MODE_DIRECT))
3761ae349f5Scvs2svn     VarTerm = stdout;
3771ae349f5Scvs2svn 
3781ae349f5Scvs2svn   ID0init();
3791ae349f5Scvs2svn   if (ID0realuid() != 0) {
3801ae349f5Scvs2svn     char conf[200], *ptr;
3811ae349f5Scvs2svn 
3821ae349f5Scvs2svn     snprintf(conf, sizeof conf, "%s/%s", _PATH_PPP, CONFFILE);
3831ae349f5Scvs2svn     do {
3841ae349f5Scvs2svn       if (!access(conf, W_OK)) {
3851ae349f5Scvs2svn         LogPrintf(LogALERT, "ppp: Access violation: Please protect %s\n", conf);
3861ae349f5Scvs2svn         return -1;
3871ae349f5Scvs2svn       }
3881ae349f5Scvs2svn       ptr = conf + strlen(conf)-2;
3891ae349f5Scvs2svn       while (ptr > conf && *ptr != '/')
3901ae349f5Scvs2svn         *ptr-- = '\0';
3911ae349f5Scvs2svn     } while (ptr >= conf);
3921ae349f5Scvs2svn   }
3931ae349f5Scvs2svn 
3941ae349f5Scvs2svn   if (!ValidSystem(label)) {
3951ae349f5Scvs2svn     fprintf(stderr, "You may not use ppp in this mode with this label\n");
3961ae349f5Scvs2svn     if (mode & MODE_DIRECT) {
3971ae349f5Scvs2svn       const char *l;
3981ae349f5Scvs2svn       l = label ? label : "default";
3991ae349f5Scvs2svn       LogPrintf(LogWARN, "Label %s rejected -direct connection\n", l);
4001ae349f5Scvs2svn     }
4011ae349f5Scvs2svn     LogClose();
4021ae349f5Scvs2svn     return 1;
4031ae349f5Scvs2svn   }
4041ae349f5Scvs2svn 
4051ae349f5Scvs2svn   if (!GetShortHost())
4061ae349f5Scvs2svn     return 1;
4071ae349f5Scvs2svn   IsInteractive(1);
4081ae349f5Scvs2svn   IpcpDefAddress();
4091ae349f5Scvs2svn 
4101ae349f5Scvs2svn   if (mode & MODE_INTER)
4111ae349f5Scvs2svn     VarLocalAuth = LOCAL_AUTH;
4121ae349f5Scvs2svn 
4131ae349f5Scvs2svn   if (SelectSystem("default", CONFFILE) < 0 && VarTerm)
4141ae349f5Scvs2svn     fprintf(VarTerm, "Warning: No default entry is given in config file.\n");
4151ae349f5Scvs2svn 
4161ae349f5Scvs2svn   if (OpenTunnel(&tunno) < 0) {
4171ae349f5Scvs2svn     LogPrintf(LogWARN, "OpenTunnel: %s\n", strerror(errno));
4181ae349f5Scvs2svn     return EX_START;
4191ae349f5Scvs2svn   }
4201ae349f5Scvs2svn   CleanInterface(IfDevName);
4211ae349f5Scvs2svn   if ((mode & MODE_OUTGOING_DAEMON) && !(mode & MODE_DEDICATED))
4221ae349f5Scvs2svn     if (label == NULL) {
4231ae349f5Scvs2svn       if (VarTerm)
4241ae349f5Scvs2svn 	fprintf(VarTerm, "Destination system must be specified in"
4251ae349f5Scvs2svn 		" auto, background or ddial mode.\n");
4261ae349f5Scvs2svn       return EX_START;
4271ae349f5Scvs2svn     }
4281ae349f5Scvs2svn 
4291ae349f5Scvs2svn   pending_signal(SIGHUP, CloseSession);
4301ae349f5Scvs2svn   pending_signal(SIGTERM, CloseSession);
4311ae349f5Scvs2svn   pending_signal(SIGINT, CloseConnection);
4321ae349f5Scvs2svn   pending_signal(SIGQUIT, CloseSession);
4331ae349f5Scvs2svn #ifdef SIGPIPE
4341ae349f5Scvs2svn   signal(SIGPIPE, SIG_IGN);
4351ae349f5Scvs2svn #endif
4361ae349f5Scvs2svn #ifdef SIGALRM
4371ae349f5Scvs2svn   pending_signal(SIGALRM, SIG_IGN);
4381ae349f5Scvs2svn #endif
4391ae349f5Scvs2svn   if (mode & MODE_INTER) {
4401ae349f5Scvs2svn #ifdef SIGTSTP
4411ae349f5Scvs2svn     pending_signal(SIGTSTP, TerminalStop);
4421ae349f5Scvs2svn #endif
4431ae349f5Scvs2svn #ifdef SIGTTIN
4441ae349f5Scvs2svn     pending_signal(SIGTTIN, TerminalStop);
4451ae349f5Scvs2svn #endif
4461ae349f5Scvs2svn #ifdef SIGTTOU
4471ae349f5Scvs2svn     pending_signal(SIGTTOU, SIG_IGN);
4481ae349f5Scvs2svn #endif
4491ae349f5Scvs2svn   }
4501ae349f5Scvs2svn   if (!(mode & MODE_INTER)) {
4511ae349f5Scvs2svn #ifdef SIGUSR1
4521ae349f5Scvs2svn     pending_signal(SIGUSR1, SetUpServer);
4531ae349f5Scvs2svn #endif
4541ae349f5Scvs2svn #ifdef SIGUSR2
4551ae349f5Scvs2svn     pending_signal(SIGUSR2, BringDownServer);
4561ae349f5Scvs2svn #endif
4571ae349f5Scvs2svn   }
4581ae349f5Scvs2svn 
4591ae349f5Scvs2svn   if (label) {
4601ae349f5Scvs2svn     if (SelectSystem(label, CONFFILE) < 0) {
4611ae349f5Scvs2svn       LogPrintf(LogWARN, "Destination system %s not found in conf file.\n",
4621ae349f5Scvs2svn                 GetLabel());
4631ae349f5Scvs2svn       Cleanup(EX_START);
4641ae349f5Scvs2svn     }
4651ae349f5Scvs2svn     /*
4661ae349f5Scvs2svn      * We don't SetLabel() 'till now in case SelectSystem() has an
4671ae349f5Scvs2svn      * embeded load "otherlabel" command.
4681ae349f5Scvs2svn      */
4691ae349f5Scvs2svn     SetLabel(label);
4701ae349f5Scvs2svn     if (mode & MODE_OUTGOING_DAEMON &&
47129e275ceSBrian Somers 	IpcpInfo.DefHisAddress.ipaddr.s_addr == INADDR_ANY) {
4721ae349f5Scvs2svn       LogPrintf(LogWARN, "You must \"set ifaddr\" in label %s for"
4731ae349f5Scvs2svn 		" auto, background or ddial mode.\n", label);
4741ae349f5Scvs2svn       Cleanup(EX_START);
4751ae349f5Scvs2svn     }
4761ae349f5Scvs2svn   }
4771ae349f5Scvs2svn 
4781ae349f5Scvs2svn   if (mode & MODE_DAEMON) {
4791ae349f5Scvs2svn     if (mode & MODE_BACKGROUND) {
4801ae349f5Scvs2svn       if (pipe(BGFiledes)) {
4811ae349f5Scvs2svn 	LogPrintf(LogERROR, "pipe: %s\n", strerror(errno));
4821ae349f5Scvs2svn 	Cleanup(EX_SOCK);
4831ae349f5Scvs2svn       }
4841ae349f5Scvs2svn     }
4851ae349f5Scvs2svn 
4861ae349f5Scvs2svn     if (!(mode & MODE_DIRECT)) {
4871ae349f5Scvs2svn       pid_t bgpid;
4881ae349f5Scvs2svn 
4891ae349f5Scvs2svn       bgpid = fork();
4901ae349f5Scvs2svn       if (bgpid == -1) {
4911ae349f5Scvs2svn 	LogPrintf(LogERROR, "fork: %s\n", strerror(errno));
4921ae349f5Scvs2svn 	Cleanup(EX_SOCK);
4931ae349f5Scvs2svn       }
4941ae349f5Scvs2svn       if (bgpid) {
4951ae349f5Scvs2svn 	char c = EX_NORMAL;
4961ae349f5Scvs2svn 
4971ae349f5Scvs2svn 	if (mode & MODE_BACKGROUND) {
4981ae349f5Scvs2svn 	  /* Wait for our child to close its pipe before we exit. */
4991ae349f5Scvs2svn 	  BGPid = bgpid;
5001ae349f5Scvs2svn 	  close(BGFiledes[1]);
5011ae349f5Scvs2svn 	  if (read(BGFiledes[0], &c, 1) != 1) {
5021ae349f5Scvs2svn 	    fprintf(VarTerm, "Child exit, no status.\n");
5031ae349f5Scvs2svn 	    LogPrintf(LogPHASE, "Parent: Child exit, no status.\n");
5041ae349f5Scvs2svn 	  } else if (c == EX_NORMAL) {
5051ae349f5Scvs2svn 	    fprintf(VarTerm, "PPP enabled.\n");
5061ae349f5Scvs2svn 	    LogPrintf(LogPHASE, "Parent: PPP enabled.\n");
5071ae349f5Scvs2svn 	  } else {
5081ae349f5Scvs2svn 	    fprintf(VarTerm, "Child failed (%s).\n", ex_desc((int) c));
5091ae349f5Scvs2svn 	    LogPrintf(LogPHASE, "Parent: Child failed (%s).\n",
5101ae349f5Scvs2svn 		      ex_desc((int) c));
5111ae349f5Scvs2svn 	  }
5121ae349f5Scvs2svn 	  close(BGFiledes[0]);
5131ae349f5Scvs2svn 	}
5141ae349f5Scvs2svn 	return c;
5151ae349f5Scvs2svn       } else if (mode & MODE_BACKGROUND)
5161ae349f5Scvs2svn 	close(BGFiledes[0]);
5171ae349f5Scvs2svn     }
5181ae349f5Scvs2svn 
5191ae349f5Scvs2svn     VarTerm = 0;		/* We know it's currently stdout */
5201ae349f5Scvs2svn     close(STDOUT_FILENO);
5211ae349f5Scvs2svn     close(STDERR_FILENO);
5221ae349f5Scvs2svn 
5231ae349f5Scvs2svn     if (mode & MODE_DIRECT)
5241ae349f5Scvs2svn       /* STDIN_FILENO gets used by OpenModem in DIRECT mode */
5251ae349f5Scvs2svn       TtyInit(1);
5261ae349f5Scvs2svn     else if (mode & MODE_DAEMON) {
5271ae349f5Scvs2svn       setsid();
5281ae349f5Scvs2svn       close(STDIN_FILENO);
5291ae349f5Scvs2svn     }
5301ae349f5Scvs2svn   } else {
5311ae349f5Scvs2svn     close(STDIN_FILENO);
5321ae349f5Scvs2svn     if ((netfd = open(_PATH_TTY, O_RDONLY)) < 0) {
5331ae349f5Scvs2svn       fprintf(stderr, "Cannot open %s for intput !\n", _PATH_TTY);
5341ae349f5Scvs2svn       return 2;
5351ae349f5Scvs2svn     }
5361ae349f5Scvs2svn     close(STDERR_FILENO);
5371ae349f5Scvs2svn     TtyInit(0);
5381ae349f5Scvs2svn     TtyCommandMode(1);
5391ae349f5Scvs2svn   }
5401ae349f5Scvs2svn 
5411ae349f5Scvs2svn   snprintf(pid_filename, sizeof pid_filename, "%stun%d.pid",
5421ae349f5Scvs2svn            _PATH_VARRUN, tunno);
5431ae349f5Scvs2svn   lockfile = ID0fopen(pid_filename, "w");
5441ae349f5Scvs2svn   if (lockfile != NULL) {
5451ae349f5Scvs2svn     fprintf(lockfile, "%d\n", (int) getpid());
5461ae349f5Scvs2svn     fclose(lockfile);
5471ae349f5Scvs2svn   }
5481ae349f5Scvs2svn #ifndef RELEASE_CRUNCH
5491ae349f5Scvs2svn   else
5501ae349f5Scvs2svn     LogPrintf(LogALERT, "Warning: Can't create %s: %s\n",
5511ae349f5Scvs2svn               pid_filename, strerror(errno));
5521ae349f5Scvs2svn #endif
5531ae349f5Scvs2svn 
5541ae349f5Scvs2svn   LogPrintf(LogPHASE, "PPP Started.\n");
5551ae349f5Scvs2svn 
5561ae349f5Scvs2svn 
5571ae349f5Scvs2svn   do
5581ae349f5Scvs2svn     DoLoop();
5591ae349f5Scvs2svn   while (mode & MODE_DEDICATED);
5601ae349f5Scvs2svn 
5611ae349f5Scvs2svn   Cleanup(EX_DONE);
5621ae349f5Scvs2svn   return 0;
5631ae349f5Scvs2svn }
5641ae349f5Scvs2svn 
5651ae349f5Scvs2svn /*
5661ae349f5Scvs2svn  *  Turn into packet mode, where we speak PPP.
5671ae349f5Scvs2svn  */
5681ae349f5Scvs2svn void
5691ae349f5Scvs2svn PacketMode(int delay)
5701ae349f5Scvs2svn {
57163b73463SBrian Somers   if (RawModem(pppVars.physical) < 0) {
5721ae349f5Scvs2svn     LogPrintf(LogWARN, "PacketMode: Not connected.\n");
5731ae349f5Scvs2svn     return;
5741ae349f5Scvs2svn   }
5751ae349f5Scvs2svn   AsyncInit();
5761ae349f5Scvs2svn   VjInit(15);
57763b73463SBrian Somers   LcpInit(pppVars.physical);
57863b73463SBrian Somers   IpcpInit(pppVars.physical);
57963b73463SBrian Somers   CcpInit(pppVars.physical);
5801ae349f5Scvs2svn   LcpUp();
5811ae349f5Scvs2svn 
5821ae349f5Scvs2svn   LcpOpen(delay);
5831ae349f5Scvs2svn   if (mode & MODE_INTER)
5841ae349f5Scvs2svn     TtyCommandMode(1);
5851ae349f5Scvs2svn   if (VarTerm) {
5861ae349f5Scvs2svn     fprintf(VarTerm, "Packet mode.\n");
5871ae349f5Scvs2svn     aft_cmd = 1;
5881ae349f5Scvs2svn   }
5891ae349f5Scvs2svn }
5901ae349f5Scvs2svn 
5911ae349f5Scvs2svn static void
5921ae349f5Scvs2svn ShowHelp(void)
5931ae349f5Scvs2svn {
5941ae349f5Scvs2svn   fprintf(stderr, "The following commands are available:\r\n");
5951ae349f5Scvs2svn   fprintf(stderr, " ~p\tEnter Packet mode\r\n");
5961ae349f5Scvs2svn   fprintf(stderr, " ~-\tDecrease log level\r\n");
5971ae349f5Scvs2svn   fprintf(stderr, " ~+\tIncrease log level\r\n");
5981ae349f5Scvs2svn   fprintf(stderr, " ~t\tShow timers (only in \"log debug\" mode)\r\n");
5991ae349f5Scvs2svn   fprintf(stderr, " ~m\tShow memory map (only in \"log debug\" mode)\r\n");
6001ae349f5Scvs2svn   fprintf(stderr, " ~.\tTerminate program\r\n");
6011ae349f5Scvs2svn   fprintf(stderr, " ~?\tThis help\r\n");
6021ae349f5Scvs2svn }
6031ae349f5Scvs2svn 
6041ae349f5Scvs2svn static void
6051ae349f5Scvs2svn ReadTty(void)
6061ae349f5Scvs2svn {
6071ae349f5Scvs2svn   int n;
6081ae349f5Scvs2svn   char ch;
6091ae349f5Scvs2svn   static int ttystate;
6101ae349f5Scvs2svn   char linebuff[LINE_LEN];
6111ae349f5Scvs2svn 
6121ae349f5Scvs2svn   LogPrintf(LogDEBUG, "termode = %d, netfd = %d, mode = %d\n",
6131ae349f5Scvs2svn 	    TermMode, netfd, mode);
6141ae349f5Scvs2svn   if (!TermMode) {
6151ae349f5Scvs2svn     n = read(netfd, linebuff, sizeof linebuff - 1);
6161ae349f5Scvs2svn     if (n > 0) {
6171ae349f5Scvs2svn       aft_cmd = 1;
6181ae349f5Scvs2svn       if (linebuff[n-1] == '\n')
6191ae349f5Scvs2svn         linebuff[--n] = '\0';
6201ae349f5Scvs2svn       else
6211ae349f5Scvs2svn         linebuff[n] = '\0';
6221ae349f5Scvs2svn       if (n)
6231ae349f5Scvs2svn         DecodeCommand(linebuff, n, IsInteractive(0) ? NULL : "Client");
6241ae349f5Scvs2svn       Prompt();
6251ae349f5Scvs2svn     } else if (n <= 0) {
6261ae349f5Scvs2svn       LogPrintf(LogPHASE, "Client connection closed.\n");
6271ae349f5Scvs2svn       DropClient(0);
6281ae349f5Scvs2svn     }
6291ae349f5Scvs2svn     return;
6301ae349f5Scvs2svn   }
6311ae349f5Scvs2svn 
6321ae349f5Scvs2svn   /*
6331ae349f5Scvs2svn    * We are in terminal mode, decode special sequences
6341ae349f5Scvs2svn    */
6351ae349f5Scvs2svn   n = read(netfd, &ch, 1);
6361ae349f5Scvs2svn   LogPrintf(LogDEBUG, "Got %d bytes (reading from the terminal)\n", n);
6371ae349f5Scvs2svn 
6381ae349f5Scvs2svn   if (n > 0) {
6391ae349f5Scvs2svn     switch (ttystate) {
6401ae349f5Scvs2svn     case 0:
6411ae349f5Scvs2svn       if (ch == '~')
6421ae349f5Scvs2svn 	ttystate++;
6431ae349f5Scvs2svn       else
64463b73463SBrian Somers 	/* XXX missing return value check */
64563b73463SBrian Somers 	Physical_Write(pppVars.physical, &ch, n);
6461ae349f5Scvs2svn       break;
6471ae349f5Scvs2svn     case 1:
6481ae349f5Scvs2svn       switch (ch) {
6491ae349f5Scvs2svn       case '?':
6501ae349f5Scvs2svn 	ShowHelp();
6511ae349f5Scvs2svn 	break;
6521ae349f5Scvs2svn       case 'p':
6531ae349f5Scvs2svn 
6541ae349f5Scvs2svn 	/*
6551ae349f5Scvs2svn 	 * XXX: Should check carrier.
6561ae349f5Scvs2svn 	 */
6571ae349f5Scvs2svn 	if (LcpFsm.state <= ST_CLOSED)
6581ae349f5Scvs2svn 	  PacketMode(0);
6591ae349f5Scvs2svn 	break;
6601ae349f5Scvs2svn       case '.':
6611ae349f5Scvs2svn 	TermMode = 1;
6621ae349f5Scvs2svn 	aft_cmd = 1;
6631ae349f5Scvs2svn 	TtyCommandMode(1);
6641ae349f5Scvs2svn 	break;
6651ae349f5Scvs2svn       case 't':
6661ae349f5Scvs2svn 	if (LogIsKept(LogDEBUG)) {
6671ae349f5Scvs2svn 	  ShowTimers();
6681ae349f5Scvs2svn 	  break;
6691ae349f5Scvs2svn 	}
6701ae349f5Scvs2svn       case 'm':
6711ae349f5Scvs2svn 	if (LogIsKept(LogDEBUG)) {
6721ae349f5Scvs2svn 	  ShowMemMap(NULL);
6731ae349f5Scvs2svn 	  break;
6741ae349f5Scvs2svn 	}
6751ae349f5Scvs2svn       default:
67663b73463SBrian Somers 	if (Physical_Write(pppVars.physical, &ch, n) < 0)
6771ae349f5Scvs2svn 	  LogPrintf(LogERROR, "error writing to modem.\n");
6781ae349f5Scvs2svn 	break;
6791ae349f5Scvs2svn       }
6801ae349f5Scvs2svn       ttystate = 0;
6811ae349f5Scvs2svn       break;
6821ae349f5Scvs2svn     }
6831ae349f5Scvs2svn   }
6841ae349f5Scvs2svn }
6851ae349f5Scvs2svn 
6861ae349f5Scvs2svn 
6871ae349f5Scvs2svn /*
6881ae349f5Scvs2svn  *  Here, we'll try to detect HDLC frame
6891ae349f5Scvs2svn  */
6901ae349f5Scvs2svn 
6911ae349f5Scvs2svn static const char *FrameHeaders[] = {
6921ae349f5Scvs2svn   "\176\377\003\300\041",
6931ae349f5Scvs2svn   "\176\377\175\043\300\041",
6941ae349f5Scvs2svn   "\176\177\175\043\100\041",
6951ae349f5Scvs2svn   "\176\175\337\175\043\300\041",
6961ae349f5Scvs2svn   "\176\175\137\175\043\100\041",
6971ae349f5Scvs2svn   NULL,
6981ae349f5Scvs2svn };
6991ae349f5Scvs2svn 
7001ae349f5Scvs2svn static const u_char *
70163b73463SBrian Somers HdlcDetect(struct physical *physical, u_char * cp, int n)
7021ae349f5Scvs2svn {
7031ae349f5Scvs2svn   const char *ptr, *fp, **hp;
7041ae349f5Scvs2svn 
7051ae349f5Scvs2svn   cp[n] = '\0';			/* be sure to null terminated */
7061ae349f5Scvs2svn   ptr = NULL;
7071ae349f5Scvs2svn   for (hp = FrameHeaders; *hp; hp++) {
7081ae349f5Scvs2svn     fp = *hp;
70963b73463SBrian Somers     if (Physical_IsSync(physical))
7101ae349f5Scvs2svn       fp++;
7111ae349f5Scvs2svn     ptr = strstr((char *) cp, fp);
7121ae349f5Scvs2svn     if (ptr)
7131ae349f5Scvs2svn       break;
7141ae349f5Scvs2svn   }
7151ae349f5Scvs2svn   return ((const u_char *) ptr);
7161ae349f5Scvs2svn }
7171ae349f5Scvs2svn 
7181ae349f5Scvs2svn static struct pppTimer RedialTimer;
7191ae349f5Scvs2svn 
7201ae349f5Scvs2svn static void
7211ae349f5Scvs2svn RedialTimeout(void *v)
7221ae349f5Scvs2svn {
7231ae349f5Scvs2svn   StopTimer(&RedialTimer);
7241ae349f5Scvs2svn   LogPrintf(LogPHASE, "Redialing timer expired.\n");
7251ae349f5Scvs2svn }
7261ae349f5Scvs2svn 
7271ae349f5Scvs2svn static void
7281ae349f5Scvs2svn StartRedialTimer(int Timeout)
7291ae349f5Scvs2svn {
7301ae349f5Scvs2svn   StopTimer(&RedialTimer);
7311ae349f5Scvs2svn 
7321ae349f5Scvs2svn   if (Timeout) {
7331ae349f5Scvs2svn     RedialTimer.state = TIMER_STOPPED;
7341ae349f5Scvs2svn 
7351ae349f5Scvs2svn     if (Timeout > 0)
7361ae349f5Scvs2svn       RedialTimer.load = Timeout * SECTICKS;
7371ae349f5Scvs2svn     else
7381ae349f5Scvs2svn       RedialTimer.load = (random() % REDIAL_PERIOD) * SECTICKS;
7391ae349f5Scvs2svn 
7401ae349f5Scvs2svn     LogPrintf(LogPHASE, "Enter pause (%d) for redialing.\n",
7411ae349f5Scvs2svn 	      RedialTimer.load / SECTICKS);
7421ae349f5Scvs2svn 
7431ae349f5Scvs2svn     RedialTimer.func = RedialTimeout;
7441ae349f5Scvs2svn     StartTimer(&RedialTimer);
7451ae349f5Scvs2svn   }
7461ae349f5Scvs2svn }
7471ae349f5Scvs2svn 
7481ae349f5Scvs2svn #define IN_SIZE sizeof(struct sockaddr_in)
7491ae349f5Scvs2svn #define UN_SIZE sizeof(struct sockaddr_in)
7501ae349f5Scvs2svn #define ADDRSZ (IN_SIZE > UN_SIZE ? IN_SIZE : UN_SIZE)
7511ae349f5Scvs2svn 
7521ae349f5Scvs2svn static void
7531ae349f5Scvs2svn DoLoop(void)
7541ae349f5Scvs2svn {
7551ae349f5Scvs2svn   fd_set rfds, wfds, efds;
7561ae349f5Scvs2svn   int pri, i, n, wfd, nfds;
7571ae349f5Scvs2svn   char hisaddr[ADDRSZ];
7581ae349f5Scvs2svn   struct sockaddr *sa = (struct sockaddr *)hisaddr;
7591ae349f5Scvs2svn   struct sockaddr_in *sin = (struct sockaddr_in *)hisaddr;
7601ae349f5Scvs2svn   struct timeval timeout, *tp;
7611ae349f5Scvs2svn   int ssize = ADDRSZ;
7621ae349f5Scvs2svn   const u_char *cp;
7631ae349f5Scvs2svn   int tries;
7641ae349f5Scvs2svn   int qlen;
7651ae349f5Scvs2svn   int res;
7661ae349f5Scvs2svn   struct tun_data tun;
7671ae349f5Scvs2svn #define rbuff tun.data
7681ae349f5Scvs2svn 
7691ae349f5Scvs2svn   if (mode & MODE_DIRECT) {
7701ae349f5Scvs2svn     LogPrintf(LogDEBUG, "Opening modem\n");
77163b73463SBrian Somers     if (OpenModem(pppVars.physical) < 0)
7721ae349f5Scvs2svn       return;
7731ae349f5Scvs2svn     LogPrintf(LogPHASE, "Packet mode enabled\n");
7741ae349f5Scvs2svn     PacketMode(VarOpenMode);
7751ae349f5Scvs2svn   } else if (mode & MODE_DEDICATED) {
77663b73463SBrian Somers     if (!Physical_IsActive(pppVars.physical))
77763b73463SBrian Somers       while (OpenModem(pppVars.physical) < 0)
7781ae349f5Scvs2svn 	nointr_sleep(VarReconnectTimer);
7791ae349f5Scvs2svn   }
7801ae349f5Scvs2svn   fflush(VarTerm);
7811ae349f5Scvs2svn 
7821ae349f5Scvs2svn   timeout.tv_sec = 0;
7831ae349f5Scvs2svn   timeout.tv_usec = 0;
7841ae349f5Scvs2svn   reconnectState = RECON_UNKNOWN;
7851ae349f5Scvs2svn 
7861ae349f5Scvs2svn   if (mode & MODE_BACKGROUND)
7871ae349f5Scvs2svn     dial_up = 1;		/* Bring the line up */
7881ae349f5Scvs2svn   else
7891ae349f5Scvs2svn     dial_up = 0;		/* XXXX */
7901ae349f5Scvs2svn   tries = 0;
7911ae349f5Scvs2svn   for (;;) {
7921ae349f5Scvs2svn     nfds = 0;
7931ae349f5Scvs2svn     FD_ZERO(&rfds);
7941ae349f5Scvs2svn     FD_ZERO(&wfds);
7951ae349f5Scvs2svn     FD_ZERO(&efds);
7961ae349f5Scvs2svn 
7971ae349f5Scvs2svn     /*
7981ae349f5Scvs2svn      * If the link is down and we're in DDIAL mode, bring it back up.
7991ae349f5Scvs2svn      */
8001ae349f5Scvs2svn     if (mode & MODE_DDIAL && LcpFsm.state <= ST_CLOSED)
8011ae349f5Scvs2svn       dial_up = 1;
8021ae349f5Scvs2svn 
8031ae349f5Scvs2svn     /*
8041ae349f5Scvs2svn      * If we lost carrier and want to re-establish the connection due to the
8051ae349f5Scvs2svn      * "set reconnect" value, we'd better bring the line back up.
8061ae349f5Scvs2svn      */
8071ae349f5Scvs2svn     if (LcpFsm.state <= ST_CLOSED) {
8081ae349f5Scvs2svn       if (!dial_up && reconnectState == RECON_TRUE) {
8091ae349f5Scvs2svn 	if (++reconnectCount <= VarReconnectTries) {
8101ae349f5Scvs2svn 	  LogPrintf(LogPHASE, "Connection lost, re-establish (%d/%d)\n",
8111ae349f5Scvs2svn 		    reconnectCount, VarReconnectTries);
8121ae349f5Scvs2svn 	  StartRedialTimer(VarReconnectTimer);
8131ae349f5Scvs2svn 	  dial_up = 1;
8141ae349f5Scvs2svn 	} else {
8151ae349f5Scvs2svn 	  if (VarReconnectTries)
8161ae349f5Scvs2svn 	    LogPrintf(LogPHASE, "Connection lost, maximum (%d) times\n",
8171ae349f5Scvs2svn 		      VarReconnectTries);
8181ae349f5Scvs2svn 	  reconnectCount = 0;
8191ae349f5Scvs2svn 	  if (mode & MODE_BACKGROUND)
8201ae349f5Scvs2svn 	    Cleanup(EX_DEAD);
8211ae349f5Scvs2svn 	}
8221ae349f5Scvs2svn 	reconnectState = RECON_ENVOKED;
8231ae349f5Scvs2svn       } else if (mode & MODE_DEDICATED)
8241ae349f5Scvs2svn         PacketMode(VarOpenMode);
8251ae349f5Scvs2svn     }
8261ae349f5Scvs2svn 
8271ae349f5Scvs2svn     /*
8281ae349f5Scvs2svn      * If Ip packet for output is enqueued and require dial up, Just do it!
8291ae349f5Scvs2svn      */
8301ae349f5Scvs2svn     if (dial_up && RedialTimer.state != TIMER_RUNNING) {
83163b73463SBrian Somers       LogPrintf(LogDEBUG, "going to dial: modem = %d\n",
83263b73463SBrian Somers 		Physical_GetFD(pppVars.physical));
83363b73463SBrian Somers       if (OpenModem(pppVars.physical) < 0) {
8341ae349f5Scvs2svn 	tries++;
8351ae349f5Scvs2svn 	if (!(mode & MODE_DDIAL) && VarDialTries)
8361ae349f5Scvs2svn 	  LogPrintf(LogCHAT, "Failed to open modem (attempt %u of %d)\n",
8371ae349f5Scvs2svn 		    tries, VarDialTries);
8381ae349f5Scvs2svn 	else
8391ae349f5Scvs2svn 	  LogPrintf(LogCHAT, "Failed to open modem (attempt %u)\n", tries);
8401ae349f5Scvs2svn 
8411ae349f5Scvs2svn 	if (!(mode & MODE_DDIAL) && VarDialTries && tries >= VarDialTries) {
8421ae349f5Scvs2svn 	  if (mode & MODE_BACKGROUND)
8431ae349f5Scvs2svn 	    Cleanup(EX_DIAL);	/* Can't get the modem */
8441ae349f5Scvs2svn 	  dial_up = 0;
8451ae349f5Scvs2svn 	  reconnectState = RECON_UNKNOWN;
8461ae349f5Scvs2svn 	  reconnectCount = 0;
8471ae349f5Scvs2svn 	  tries = 0;
8481ae349f5Scvs2svn 	} else
8491ae349f5Scvs2svn 	  StartRedialTimer(VarRedialTimeout);
8501ae349f5Scvs2svn       } else {
8511ae349f5Scvs2svn 	tries++;		/* Tries are per number, not per list of
8521ae349f5Scvs2svn 				 * numbers. */
8531ae349f5Scvs2svn 	if (!(mode & MODE_DDIAL) && VarDialTries)
8541ae349f5Scvs2svn 	  LogPrintf(LogCHAT, "Dial attempt %u of %d\n", tries, VarDialTries);
8551ae349f5Scvs2svn 	else
8561ae349f5Scvs2svn 	  LogPrintf(LogCHAT, "Dial attempt %u\n", tries);
8571ae349f5Scvs2svn 
85863b73463SBrian Somers 	if ((res = DialModem(pppVars.physical)) == EX_DONE) {
85963b73463SBrian Somers 	  ModemTimeout(pppVars.physical);
8601ae349f5Scvs2svn 	  PacketMode(VarOpenMode);
8611ae349f5Scvs2svn 	  dial_up = 0;
8621ae349f5Scvs2svn 	  reconnectState = RECON_UNKNOWN;
8631ae349f5Scvs2svn 	  tries = 0;
8641ae349f5Scvs2svn 	} else {
8651ae349f5Scvs2svn 	  if (mode & MODE_BACKGROUND) {
8661ae349f5Scvs2svn 	    if (VarNextPhone == NULL || res == EX_SIG)
8671ae349f5Scvs2svn 	      Cleanup(EX_DIAL);	/* Tried all numbers - no luck */
8681ae349f5Scvs2svn 	    else
8691ae349f5Scvs2svn 	      /* Try all numbers in background mode */
8701ae349f5Scvs2svn 	      StartRedialTimer(VarRedialNextTimeout);
8711ae349f5Scvs2svn 	  } else if (!(mode & MODE_DDIAL) &&
8721ae349f5Scvs2svn 		     ((VarDialTries && tries >= VarDialTries) ||
8731ae349f5Scvs2svn 		      res == EX_SIG)) {
8741ae349f5Scvs2svn 	    /* I give up !  Can't get through :( */
8751ae349f5Scvs2svn 	    StartRedialTimer(VarRedialTimeout);
8761ae349f5Scvs2svn 	    dial_up = 0;
8771ae349f5Scvs2svn 	    reconnectState = RECON_UNKNOWN;
8781ae349f5Scvs2svn 	    reconnectCount = 0;
8791ae349f5Scvs2svn 	    tries = 0;
8801ae349f5Scvs2svn 	  } else if (VarNextPhone == NULL)
8811ae349f5Scvs2svn 	    /* Dial failed. Keep quite during redial wait period. */
8821ae349f5Scvs2svn 	    StartRedialTimer(VarRedialTimeout);
8831ae349f5Scvs2svn 	  else
8841ae349f5Scvs2svn 	    StartRedialTimer(VarRedialNextTimeout);
8851ae349f5Scvs2svn 	}
8861ae349f5Scvs2svn       }
8871ae349f5Scvs2svn     }
88863b73463SBrian Somers     qlen = ModemQlen(pppVars.physical);
8891ae349f5Scvs2svn 
8901ae349f5Scvs2svn     if (qlen == 0) {
89163b73463SBrian Somers       IpStartOutput(pppVars.physical);
89263b73463SBrian Somers       qlen = ModemQlen(pppVars.physical);
8931ae349f5Scvs2svn     }
89463b73463SBrian Somers     if (Physical_IsActive(pppVars.physical)) {
89563b73463SBrian Somers       /* XXX-ML this should probably be abstracted */
89663b73463SBrian Somers       if (Physical_GetFD(pppVars.physical) + 1 > nfds)
89763b73463SBrian Somers 	nfds = Physical_GetFD(pppVars.physical) + 1;
89863b73463SBrian Somers       Physical_FD_SET(pppVars.physical, &rfds);
89963b73463SBrian Somers       Physical_FD_SET(pppVars.physical, &efds);
9001ae349f5Scvs2svn       if (qlen > 0) {
90163b73463SBrian Somers 	Physical_FD_SET(pppVars.physical, &wfds);
9021ae349f5Scvs2svn       }
9031ae349f5Scvs2svn     }
9041ae349f5Scvs2svn     if (server >= 0) {
9051ae349f5Scvs2svn       if (server + 1 > nfds)
9061ae349f5Scvs2svn 	nfds = server + 1;
9071ae349f5Scvs2svn       FD_SET(server, &rfds);
9081ae349f5Scvs2svn     }
9091ae349f5Scvs2svn 
9101ae349f5Scvs2svn #ifndef SIGALRM
9111ae349f5Scvs2svn     /*
9121ae349f5Scvs2svn      * *** IMPORTANT ***
9131ae349f5Scvs2svn      * CPU is serviced every TICKUNIT micro seconds. This value must be chosen
9141ae349f5Scvs2svn      * with great care. If this values is too big, it results in loss of
9151ae349f5Scvs2svn      * characters from the modem and poor response.  If this value is too
9161ae349f5Scvs2svn      * small, ppp eats too much CPU time.
9171ae349f5Scvs2svn      */
9181ae349f5Scvs2svn     usleep(TICKUNIT);
9191ae349f5Scvs2svn     TimerService();
9201ae349f5Scvs2svn #else
9211ae349f5Scvs2svn     handle_signals();
9221ae349f5Scvs2svn #endif
9231ae349f5Scvs2svn 
9241ae349f5Scvs2svn     /* If there are aren't many packets queued, look for some more. */
9251ae349f5Scvs2svn     if (qlen < 20 && tun_in >= 0) {
9261ae349f5Scvs2svn       if (tun_in + 1 > nfds)
9271ae349f5Scvs2svn 	nfds = tun_in + 1;
9281ae349f5Scvs2svn       FD_SET(tun_in, &rfds);
9291ae349f5Scvs2svn     }
9301ae349f5Scvs2svn     if (netfd >= 0) {
9311ae349f5Scvs2svn       if (netfd + 1 > nfds)
9321ae349f5Scvs2svn 	nfds = netfd + 1;
9331ae349f5Scvs2svn       FD_SET(netfd, &rfds);
9341ae349f5Scvs2svn       FD_SET(netfd, &efds);
9351ae349f5Scvs2svn     }
9361ae349f5Scvs2svn #ifndef SIGALRM
9371ae349f5Scvs2svn 
9381ae349f5Scvs2svn     /*
9391ae349f5Scvs2svn      * Normally, select() will not block because modem is writable. In AUTO
9401ae349f5Scvs2svn      * mode, select will block until we find packet from tun
9411ae349f5Scvs2svn      */
9421ae349f5Scvs2svn     tp = (RedialTimer.state == TIMER_RUNNING) ? &timeout : NULL;
9431ae349f5Scvs2svn     i = select(nfds, &rfds, &wfds, &efds, tp);
9441ae349f5Scvs2svn #else
9451ae349f5Scvs2svn 
9461ae349f5Scvs2svn     /*
9471ae349f5Scvs2svn      * When SIGALRM timer is running, a select function will be return -1 and
9481ae349f5Scvs2svn      * EINTR after a Time Service signal hundler is done.  If the redial
9491ae349f5Scvs2svn      * timer is not running and we are trying to dial, poll with a 0 value
9501ae349f5Scvs2svn      * timer.
9511ae349f5Scvs2svn      */
9521ae349f5Scvs2svn     tp = (dial_up && RedialTimer.state != TIMER_RUNNING) ? &timeout : NULL;
9531ae349f5Scvs2svn     i = select(nfds, &rfds, &wfds, &efds, tp);
9541ae349f5Scvs2svn #endif
9551ae349f5Scvs2svn 
9561ae349f5Scvs2svn     if (i == 0) {
9571ae349f5Scvs2svn       continue;
9581ae349f5Scvs2svn     }
9591ae349f5Scvs2svn     if (i < 0) {
9601ae349f5Scvs2svn       if (errno == EINTR) {
9611ae349f5Scvs2svn 	handle_signals();
9621ae349f5Scvs2svn 	continue;
9631ae349f5Scvs2svn       }
9641ae349f5Scvs2svn       LogPrintf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
9651ae349f5Scvs2svn       break;
9661ae349f5Scvs2svn     }
96763b73463SBrian Somers     if ((netfd >= 0 && FD_ISSET(netfd, &efds)) ||
96863b73463SBrian Somers 	(Physical_FD_ISSET(pppVars.physical, &efds))) {
9691ae349f5Scvs2svn       LogPrintf(LogALERT, "Exception detected.\n");
9701ae349f5Scvs2svn       break;
9711ae349f5Scvs2svn     }
9721ae349f5Scvs2svn     if (server >= 0 && FD_ISSET(server, &rfds)) {
9731ae349f5Scvs2svn       wfd = accept(server, sa, &ssize);
9741ae349f5Scvs2svn       if (wfd < 0) {
9751ae349f5Scvs2svn 	LogPrintf(LogERROR, "DoLoop: accept(): %s\n", strerror(errno));
9761ae349f5Scvs2svn 	continue;
9771ae349f5Scvs2svn       }
9781ae349f5Scvs2svn       switch (sa->sa_family) {
9791ae349f5Scvs2svn         case AF_LOCAL:
9801ae349f5Scvs2svn           LogPrintf(LogPHASE, "Connected to local client.\n");
9811ae349f5Scvs2svn           break;
9821ae349f5Scvs2svn         case AF_INET:
9831ae349f5Scvs2svn           if (ntohs(sin->sin_port) < 1024) {
9841ae349f5Scvs2svn             LogPrintf(LogALERT, "Rejected client connection from %s:%u"
9851ae349f5Scvs2svn                       "(invalid port number) !\n",
9861ae349f5Scvs2svn                       inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));
9871ae349f5Scvs2svn 	    close(wfd);
9881ae349f5Scvs2svn 	    continue;
9891ae349f5Scvs2svn           }
9901ae349f5Scvs2svn           LogPrintf(LogPHASE, "Connected to client from %s:%u\n",
9911ae349f5Scvs2svn                     inet_ntoa(sin->sin_addr), sin->sin_port);
9921ae349f5Scvs2svn           break;
9931ae349f5Scvs2svn         default:
9941ae349f5Scvs2svn 	  write(wfd, "Unrecognised access !\n", 22);
9951ae349f5Scvs2svn 	  close(wfd);
9961ae349f5Scvs2svn 	  continue;
9971ae349f5Scvs2svn       }
9981ae349f5Scvs2svn       if (netfd >= 0) {
9991ae349f5Scvs2svn 	write(wfd, "Connection already in use.\n", 27);
10001ae349f5Scvs2svn 	close(wfd);
10011ae349f5Scvs2svn 	continue;
10021ae349f5Scvs2svn       }
10031ae349f5Scvs2svn       netfd = wfd;
10041ae349f5Scvs2svn       VarTerm = fdopen(netfd, "a+");
10051ae349f5Scvs2svn       LocalAuthInit();
10061ae349f5Scvs2svn       IsInteractive(1);
10071ae349f5Scvs2svn       Prompt();
10081ae349f5Scvs2svn     }
10091ae349f5Scvs2svn     if (netfd >= 0 && FD_ISSET(netfd, &rfds))
10101ae349f5Scvs2svn       /* something to read from tty */
10111ae349f5Scvs2svn       ReadTty();
101263b73463SBrian Somers     if (Physical_FD_ISSET(pppVars.physical, &wfds)) {
10131ae349f5Scvs2svn       /* ready to write into modem */
101463b73463SBrian Somers       ModemStartOutput(pppVars.physical);
101563b73463SBrian Somers       if (!Physical_IsActive(pppVars.physical))
10161ae349f5Scvs2svn         dial_up = 1;
10171ae349f5Scvs2svn     }
101863b73463SBrian Somers     if (Physical_FD_ISSET(pppVars.physical, &rfds)) {
10191ae349f5Scvs2svn       /* something to read from modem */
10201ae349f5Scvs2svn       if (LcpFsm.state <= ST_CLOSED)
10211ae349f5Scvs2svn 	nointr_usleep(10000);
102263b73463SBrian Somers       n = Physical_Read(pppVars.physical, rbuff, sizeof rbuff);
10231ae349f5Scvs2svn       if ((mode & MODE_DIRECT) && n <= 0) {
10241ae349f5Scvs2svn 	DownConnection();
10251ae349f5Scvs2svn       } else
10261ae349f5Scvs2svn 	LogDumpBuff(LogASYNC, "ReadFromModem", rbuff, n);
10271ae349f5Scvs2svn 
10281ae349f5Scvs2svn       if (LcpFsm.state <= ST_CLOSED) {
10291ae349f5Scvs2svn 	/*
10301ae349f5Scvs2svn 	 * In dedicated mode, we just discard input until LCP is started.
10311ae349f5Scvs2svn 	 */
10321ae349f5Scvs2svn 	if (!(mode & MODE_DEDICATED)) {
103363b73463SBrian Somers 	  cp = HdlcDetect(pppVars.physical, rbuff, n);
10341ae349f5Scvs2svn 	  if (cp) {
10351ae349f5Scvs2svn 	    /*
10361ae349f5Scvs2svn 	     * LCP packet is detected. Turn ourselves into packet mode.
10371ae349f5Scvs2svn 	     */
10381ae349f5Scvs2svn 	    if (cp != rbuff) {
103963b73463SBrian Somers 	      /* XXX missing return value checks */
104063b73463SBrian Somers 	      Physical_Write(pppVars.physical, rbuff, cp - rbuff);
104163b73463SBrian Somers 	      Physical_Write(pppVars.physical, "\r\n", 2);
10421ae349f5Scvs2svn 	    }
10431ae349f5Scvs2svn 	    PacketMode(0);
10441ae349f5Scvs2svn 	  } else
10451ae349f5Scvs2svn 	    write(fileno(VarTerm), rbuff, n);
10461ae349f5Scvs2svn 	}
10471ae349f5Scvs2svn       } else {
10481ae349f5Scvs2svn 	if (n > 0)
104963b73463SBrian Somers 	  AsyncInput(rbuff, n, pppVars.physical);
10501ae349f5Scvs2svn       }
10511ae349f5Scvs2svn     }
10521ae349f5Scvs2svn     if (tun_in >= 0 && FD_ISSET(tun_in, &rfds)) {	/* something to read
10531ae349f5Scvs2svn 							 * from tun */
10541ae349f5Scvs2svn       n = read(tun_in, &tun, sizeof tun);
10551ae349f5Scvs2svn       if (n < 0) {
10561ae349f5Scvs2svn 	LogPrintf(LogERROR, "read from tun: %s\n", strerror(errno));
10571ae349f5Scvs2svn 	continue;
10581ae349f5Scvs2svn       }
10591ae349f5Scvs2svn       n -= sizeof tun - sizeof tun.data;
10601ae349f5Scvs2svn       if (n <= 0) {
10611ae349f5Scvs2svn 	LogPrintf(LogERROR, "read from tun: Only %d bytes read\n", n);
10621ae349f5Scvs2svn 	continue;
10631ae349f5Scvs2svn       }
10641ae349f5Scvs2svn       if (!tun_check_header(tun, AF_INET))
10651ae349f5Scvs2svn           continue;
10661ae349f5Scvs2svn       if (((struct ip *) rbuff)->ip_dst.s_addr == IpcpInfo.want_ipaddr.s_addr) {
10671ae349f5Scvs2svn 	/* we've been asked to send something addressed *to* us :( */
10681ae349f5Scvs2svn 	if (VarLoopback) {
10691ae349f5Scvs2svn 	  pri = PacketCheck(rbuff, n, FL_IN);
10701ae349f5Scvs2svn 	  if (pri >= 0) {
10711ae349f5Scvs2svn 	    struct mbuf *bp;
10721ae349f5Scvs2svn 
10731ae349f5Scvs2svn #ifndef NOALIAS
10741ae349f5Scvs2svn 	    if (mode & MODE_ALIAS) {
10751ae349f5Scvs2svn 	      VarPacketAliasIn(rbuff, sizeof rbuff);
10761ae349f5Scvs2svn 	      n = ntohs(((struct ip *) rbuff)->ip_len);
10771ae349f5Scvs2svn 	    }
10781ae349f5Scvs2svn #endif
10791ae349f5Scvs2svn 	    bp = mballoc(n, MB_IPIN);
10801ae349f5Scvs2svn 	    memcpy(MBUF_CTOP(bp), rbuff, n);
10811ae349f5Scvs2svn 	    IpInput(bp);
10821ae349f5Scvs2svn 	    LogPrintf(LogDEBUG, "Looped back packet addressed to myself\n");
10831ae349f5Scvs2svn 	  }
10841ae349f5Scvs2svn 	  continue;
10851ae349f5Scvs2svn 	} else
10861ae349f5Scvs2svn 	  LogPrintf(LogDEBUG, "Oops - forwarding packet addressed to myself\n");
10871ae349f5Scvs2svn       }
10881ae349f5Scvs2svn 
10891ae349f5Scvs2svn       /*
10901ae349f5Scvs2svn        * Process on-demand dialup. Output packets are queued within tunnel
10911ae349f5Scvs2svn        * device until IPCP is opened.
10921ae349f5Scvs2svn        */
10931ae349f5Scvs2svn       if (LcpFsm.state <= ST_CLOSED && (mode & MODE_AUTO) &&
10941ae349f5Scvs2svn 	  (pri = PacketCheck(rbuff, n, FL_DIAL)) >= 0)
10951ae349f5Scvs2svn         dial_up = 1;
10961ae349f5Scvs2svn 
10971ae349f5Scvs2svn       pri = PacketCheck(rbuff, n, FL_OUT);
10981ae349f5Scvs2svn       if (pri >= 0) {
10991ae349f5Scvs2svn #ifndef NOALIAS
11001ae349f5Scvs2svn 	if (mode & MODE_ALIAS) {
11011ae349f5Scvs2svn 	  VarPacketAliasOut(rbuff, sizeof rbuff);
11021ae349f5Scvs2svn 	  n = ntohs(((struct ip *) rbuff)->ip_len);
11031ae349f5Scvs2svn 	}
11041ae349f5Scvs2svn #endif
11051ae349f5Scvs2svn 	IpEnqueue(pri, rbuff, n);
11061ae349f5Scvs2svn       }
11071ae349f5Scvs2svn     }
11081ae349f5Scvs2svn   }
11091ae349f5Scvs2svn   LogPrintf(LogDEBUG, "Job (DoLoop) done.\n");
11101ae349f5Scvs2svn }
1111