1118 lines
26 KiB
C
1118 lines
26 KiB
C
/*
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* User Process PPP
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: main.c,v 1.116 1998/01/08 23:47:52 brian Exp $
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*
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* TODO:
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* o Add commands for traffic summary, version display, etc.
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* o Add signal handler for misc controls.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <net/if.h>
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#include <net/if_tun.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sysexits.h>
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#include <termios.h>
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#include <unistd.h>
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "defs.h"
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#include "id.h"
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#include "timer.h"
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#include "fsm.h"
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#include "modem.h"
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#include "os.h"
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#include "hdlc.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "ipcp.h"
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#include "loadalias.h"
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#include "vars.h"
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#include "auth.h"
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#include "filter.h"
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#include "systems.h"
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#include "ip.h"
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#include "sig.h"
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#include "server.h"
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#include "lcpproto.h"
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#include "main.h"
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#include "vjcomp.h"
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#include "async.h"
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#include "pathnames.h"
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#include "tun.h"
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#include "route.h"
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#ifndef O_NONBLOCK
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#ifdef O_NDELAY
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#define O_NONBLOCK O_NDELAY
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#endif
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#endif
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int TermMode = 0;
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int tunno = 0;
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static struct termios oldtio; /* Original tty mode */
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static struct termios comtio; /* Command level tty mode */
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static pid_t BGPid = 0;
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static char pid_filename[MAXPATHLEN];
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static int dial_up;
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static void DoLoop(void);
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static void TerminalStop(int);
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static const char *ex_desc(int);
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static void
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TtyInit(int DontWantInt)
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{
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struct termios newtio;
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int stat;
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stat = fcntl(netfd, F_GETFL, 0);
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if (stat > 0) {
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stat |= O_NONBLOCK;
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(void) fcntl(netfd, F_SETFL, stat);
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}
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newtio = oldtio;
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newtio.c_lflag &= ~(ECHO | ISIG | ICANON);
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newtio.c_iflag = 0;
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newtio.c_oflag &= ~OPOST;
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newtio.c_cc[VEOF] = _POSIX_VDISABLE;
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if (DontWantInt)
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newtio.c_cc[VINTR] = _POSIX_VDISABLE;
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newtio.c_cc[VMIN] = 1;
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newtio.c_cc[VTIME] = 0;
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newtio.c_cflag |= CS8;
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tcsetattr(netfd, TCSANOW, &newtio);
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comtio = newtio;
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}
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/*
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* Set tty into command mode. We allow canonical input and echo processing.
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*/
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void
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TtyCommandMode(int prompt)
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{
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struct termios newtio;
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int stat;
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if (!(mode & MODE_INTER))
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return;
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tcgetattr(netfd, &newtio);
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newtio.c_lflag |= (ECHO | ISIG | ICANON);
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newtio.c_iflag = oldtio.c_iflag;
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newtio.c_oflag |= OPOST;
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tcsetattr(netfd, TCSADRAIN, &newtio);
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stat = fcntl(netfd, F_GETFL, 0);
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if (stat > 0) {
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stat |= O_NONBLOCK;
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(void) fcntl(netfd, F_SETFL, stat);
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}
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TermMode = 0;
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if (prompt)
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Prompt();
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}
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/*
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* Set tty into terminal mode which is used while we invoke term command.
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*/
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void
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TtyTermMode()
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{
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int stat;
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tcsetattr(netfd, TCSADRAIN, &comtio);
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stat = fcntl(netfd, F_GETFL, 0);
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if (stat > 0) {
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stat &= ~O_NONBLOCK;
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(void) fcntl(netfd, F_SETFL, stat);
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}
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TermMode = 1;
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}
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void
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TtyOldMode()
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{
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int stat;
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stat = fcntl(netfd, F_GETFL, 0);
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if (stat > 0) {
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stat &= ~O_NONBLOCK;
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(void) fcntl(netfd, F_SETFL, stat);
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}
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tcsetattr(netfd, TCSADRAIN, &oldtio);
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}
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void
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Cleanup(int excode)
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{
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DropClient(1);
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ServerClose();
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OsInterfaceDown(1);
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HangupModem(1);
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nointr_sleep(1);
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DeleteIfRoutes(1);
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ID0unlink(pid_filename);
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if (mode & MODE_BACKGROUND && BGFiledes[1] != -1) {
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char c = EX_ERRDEAD;
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if (write(BGFiledes[1], &c, 1) == 1)
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LogPrintf(LogPHASE, "Parent notified of failure.\n");
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else
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LogPrintf(LogPHASE, "Failed to notify parent of failure.\n");
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close(BGFiledes[1]);
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}
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LogPrintf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
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TtyOldMode();
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LogClose();
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exit(excode);
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}
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static void
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CloseConnection(int signo)
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{
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/* NOTE, these are manual, we've done a setsid() */
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pending_signal(SIGINT, SIG_IGN);
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LogPrintf(LogPHASE, "Caught signal %d, abort connection\n", signo);
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reconnectState = RECON_FALSE;
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reconnectCount = 0;
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DownConnection();
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dial_up = 0;
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pending_signal(SIGINT, CloseConnection);
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}
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static void
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CloseSession(int signo)
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{
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if (BGPid) {
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kill(BGPid, SIGINT);
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exit(EX_TERM);
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}
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LogPrintf(LogPHASE, "Signal %d, terminate.\n", signo);
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reconnect(RECON_FALSE);
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LcpClose();
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Cleanup(EX_TERM);
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}
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static void
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TerminalCont(int signo)
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{
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pending_signal(SIGCONT, SIG_DFL);
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pending_signal(SIGTSTP, TerminalStop);
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TtyCommandMode(getpgrp() == tcgetpgrp(netfd));
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}
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static void
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TerminalStop(int signo)
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{
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pending_signal(SIGCONT, TerminalCont);
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TtyOldMode();
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pending_signal(SIGTSTP, SIG_DFL);
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kill(getpid(), signo);
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}
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static void
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SetUpServer(int signo)
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{
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int res;
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VarHaveLocalAuthKey = 0;
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LocalAuthInit();
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if ((res = ServerTcpOpen(SERVER_PORT + tunno)) != 0)
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LogPrintf(LogERROR, "SIGUSR1: Failed %d to open port %d\n",
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res, SERVER_PORT + tunno);
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}
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static void
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BringDownServer(int signo)
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{
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VarHaveLocalAuthKey = 0;
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LocalAuthInit();
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ServerClose();
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}
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static const char *
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ex_desc(int ex)
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{
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static char num[12];
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static const char *desc[] = {
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"normal", "start", "sock", "modem", "dial", "dead", "done",
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"reboot", "errdead", "hangup", "term", "nodial", "nologin"
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};
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if (ex >= 0 && ex < sizeof desc / sizeof *desc)
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return desc[ex];
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snprintf(num, sizeof num, "%d", ex);
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return num;
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}
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static void
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Usage(void)
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{
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fprintf(stderr,
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"Usage: ppp [-auto | -background | -direct | -dedicated | -ddial ]"
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#ifndef NOALIAS
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" [ -alias ]"
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#endif
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" [system]\n");
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exit(EX_START);
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}
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static char *
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ProcessArgs(int argc, char **argv)
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{
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int optc;
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char *cp;
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optc = 0;
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mode = MODE_INTER;
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while (argc > 0 && **argv == '-') {
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cp = *argv + 1;
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if (strcmp(cp, "auto") == 0) {
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mode |= MODE_AUTO;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "background") == 0) {
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mode |= MODE_BACKGROUND;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "direct") == 0) {
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mode |= MODE_DIRECT;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "dedicated") == 0) {
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mode |= MODE_DEDICATED;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "ddial") == 0) {
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mode |= MODE_DDIAL;
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mode &= ~MODE_INTER;
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#ifndef NOALIAS
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} else if (strcmp(cp, "alias") == 0) {
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if (loadAliasHandlers(&VarAliasHandlers) == 0)
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mode |= MODE_ALIAS;
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else
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LogPrintf(LogWARN, "Cannot load alias library\n");
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optc--; /* this option isn't exclusive */
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#endif
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} else
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Usage();
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optc++;
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argv++;
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argc--;
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}
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if (argc > 1) {
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fprintf(stderr, "specify only one system label.\n");
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exit(EX_START);
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}
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if (optc > 1) {
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fprintf(stderr, "specify only one mode.\n");
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exit(EX_START);
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}
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return argc == 1 ? *argv : NULL; /* Don't SetLabel yet ! */
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}
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static void
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Greetings(void)
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{
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if (VarTerm) {
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fprintf(VarTerm, "User Process PPP. Written by Toshiharu OHNO.\n");
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fflush(VarTerm);
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}
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}
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int
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main(int argc, char **argv)
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{
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FILE *lockfile;
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char *name, *label;
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int nfds;
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nfds = getdtablesize();
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if (nfds >= FD_SETSIZE)
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/*
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* If we've got loads of file descriptors, make sure they're all
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* closed. If they aren't, we may end up with a seg fault when our
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* `fd_set's get too big when select()ing !
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*/
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while (--nfds > 2)
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close(nfds);
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VarTerm = 0;
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name = strrchr(argv[0], '/');
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LogOpen(name ? name + 1 : argv[0]);
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tcgetattr(STDIN_FILENO, &oldtio); /* Save original tty mode */
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argc--;
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argv++;
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label = ProcessArgs(argc, argv);
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if (!(mode & MODE_DIRECT))
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VarTerm = stdout;
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ID0init();
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if (ID0realuid() != 0) {
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char conf[200], *ptr;
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snprintf(conf, sizeof conf, "%s/%s", _PATH_PPP, CONFFILE);
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do {
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if (!access(conf, W_OK)) {
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LogPrintf(LogALERT, "ppp: Access violation: Please protect %s\n", conf);
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return -1;
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}
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ptr = conf + strlen(conf)-2;
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while (ptr > conf && *ptr != '/')
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*ptr-- = '\0';
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} while (ptr >= conf);
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}
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if (!ValidSystem(label)) {
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fprintf(stderr, "You may not use ppp in this mode with this label\n");
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if (mode & MODE_DIRECT) {
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const char *l;
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l = label ? label : "default";
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LogPrintf(LogWARN, "Label %s rejected -direct connection\n", l);
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}
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LogClose();
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return 1;
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}
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if (!GetShortHost())
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return 1;
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Greetings();
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IpcpDefAddress();
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if (mode & MODE_INTER)
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VarLocalAuth = LOCAL_AUTH;
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if (SelectSystem("default", CONFFILE) < 0 && VarTerm)
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fprintf(VarTerm, "Warning: No default entry is given in config file.\n");
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if (OpenTunnel(&tunno) < 0) {
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LogPrintf(LogWARN, "OpenTunnel: %s\n", strerror(errno));
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return EX_START;
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}
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CleanInterface(IfDevName);
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if (mode & MODE_INTER)
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fprintf(VarTerm, "Interactive mode\n");
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else if ((mode & MODE_OUTGOING_DAEMON) && !(mode & MODE_DEDICATED))
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if (label == NULL) {
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if (VarTerm)
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fprintf(VarTerm, "Destination system must be specified in"
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" auto, background or ddial mode.\n");
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return EX_START;
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}
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pending_signal(SIGHUP, CloseSession);
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pending_signal(SIGTERM, CloseSession);
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pending_signal(SIGINT, CloseConnection);
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pending_signal(SIGQUIT, CloseSession);
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#ifdef SIGPIPE
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signal(SIGPIPE, SIG_IGN);
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#endif
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#ifdef SIGALRM
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pending_signal(SIGALRM, SIG_IGN);
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#endif
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if (mode & MODE_INTER) {
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#ifdef SIGTSTP
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pending_signal(SIGTSTP, TerminalStop);
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#endif
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#ifdef SIGTTIN
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pending_signal(SIGTTIN, TerminalStop);
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#endif
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#ifdef SIGTTOU
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pending_signal(SIGTTOU, SIG_IGN);
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#endif
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}
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if (!(mode & MODE_INTER)) {
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#ifdef SIGUSR1
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pending_signal(SIGUSR1, SetUpServer);
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#endif
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#ifdef SIGUSR2
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pending_signal(SIGUSR2, BringDownServer);
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#endif
|
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}
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if (label) {
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if (SelectSystem(label, CONFFILE) < 0) {
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LogPrintf(LogWARN, "Destination system %s not found in conf file.\n",
|
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GetLabel());
|
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Cleanup(EX_START);
|
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}
|
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/*
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* We don't SetLabel() 'till now in case SelectSystem() has an
|
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* embeded load "otherlabel" command.
|
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*/
|
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SetLabel(label);
|
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if (mode & MODE_OUTGOING_DAEMON &&
|
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DefHisAddress.ipaddr.s_addr == INADDR_ANY) {
|
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LogPrintf(LogWARN, "You must \"set ifaddr\" in label %s for"
|
|
" auto, background or ddial mode.\n", label);
|
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Cleanup(EX_START);
|
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}
|
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}
|
|
|
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if (mode & MODE_DAEMON) {
|
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if (mode & MODE_BACKGROUND) {
|
|
if (pipe(BGFiledes)) {
|
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LogPrintf(LogERROR, "pipe: %s\n", strerror(errno));
|
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Cleanup(EX_SOCK);
|
|
}
|
|
}
|
|
|
|
if (!(mode & MODE_DIRECT)) {
|
|
pid_t bgpid;
|
|
|
|
bgpid = fork();
|
|
if (bgpid == -1) {
|
|
LogPrintf(LogERROR, "fork: %s\n", strerror(errno));
|
|
Cleanup(EX_SOCK);
|
|
}
|
|
if (bgpid) {
|
|
char c = EX_NORMAL;
|
|
|
|
if (mode & MODE_BACKGROUND) {
|
|
/* Wait for our child to close its pipe before we exit. */
|
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BGPid = bgpid;
|
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close(BGFiledes[1]);
|
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if (read(BGFiledes[0], &c, 1) != 1) {
|
|
fprintf(VarTerm, "Child exit, no status.\n");
|
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LogPrintf(LogPHASE, "Parent: Child exit, no status.\n");
|
|
} else if (c == EX_NORMAL) {
|
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fprintf(VarTerm, "PPP enabled.\n");
|
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LogPrintf(LogPHASE, "Parent: PPP enabled.\n");
|
|
} else {
|
|
fprintf(VarTerm, "Child failed (%s).\n", ex_desc((int) c));
|
|
LogPrintf(LogPHASE, "Parent: Child failed (%s).\n",
|
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ex_desc((int) c));
|
|
}
|
|
close(BGFiledes[0]);
|
|
}
|
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return c;
|
|
} else if (mode & MODE_BACKGROUND)
|
|
close(BGFiledes[0]);
|
|
}
|
|
|
|
VarTerm = 0; /* We know it's currently stdout */
|
|
close(STDOUT_FILENO);
|
|
close(STDERR_FILENO);
|
|
|
|
if (mode & MODE_DIRECT)
|
|
/* STDIN_FILENO gets used by OpenModem in DIRECT mode */
|
|
TtyInit(1);
|
|
else if (mode & MODE_DAEMON) {
|
|
setsid();
|
|
close(STDIN_FILENO);
|
|
}
|
|
} else {
|
|
close(STDIN_FILENO);
|
|
if ((netfd = open(_PATH_TTY, O_RDONLY)) < 0) {
|
|
fprintf(stderr, "Cannot open %s for intput !\n", _PATH_TTY);
|
|
return 2;
|
|
}
|
|
close(STDERR_FILENO);
|
|
TtyInit(0);
|
|
TtyCommandMode(1);
|
|
}
|
|
|
|
snprintf(pid_filename, sizeof pid_filename, "%stun%d.pid",
|
|
_PATH_VARRUN, tunno);
|
|
lockfile = ID0fopen(pid_filename, "w");
|
|
if (lockfile != NULL) {
|
|
fprintf(lockfile, "%d\n", (int) getpid());
|
|
fclose(lockfile);
|
|
} else
|
|
LogPrintf(LogALERT, "Warning: Can't create %s: %s\n",
|
|
pid_filename, strerror(errno));
|
|
|
|
LogPrintf(LogPHASE, "PPP Started.\n");
|
|
|
|
|
|
do
|
|
DoLoop();
|
|
while (mode & MODE_DEDICATED);
|
|
|
|
Cleanup(EX_DONE);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Turn into packet mode, where we speak PPP.
|
|
*/
|
|
void
|
|
PacketMode()
|
|
{
|
|
if (RawModem() < 0) {
|
|
LogPrintf(LogWARN, "PacketMode: Not connected.\n");
|
|
return;
|
|
}
|
|
AsyncInit();
|
|
VjInit(15);
|
|
LcpInit();
|
|
IpcpInit();
|
|
CcpInit();
|
|
LcpUp();
|
|
|
|
LcpOpen(VarOpenMode);
|
|
if (mode & MODE_INTER)
|
|
TtyCommandMode(1);
|
|
if (VarTerm) {
|
|
fprintf(VarTerm, "Packet mode.\n");
|
|
aft_cmd = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ShowHelp(void)
|
|
{
|
|
fprintf(stderr, "The following commands are available:\r\n");
|
|
fprintf(stderr, " ~p\tEnter Packet mode\r\n");
|
|
fprintf(stderr, " ~-\tDecrease log level\r\n");
|
|
fprintf(stderr, " ~+\tIncrease log level\r\n");
|
|
fprintf(stderr, " ~t\tShow timers (only in \"log debug\" mode)\r\n");
|
|
fprintf(stderr, " ~m\tShow memory map (only in \"log debug\" mode)\r\n");
|
|
fprintf(stderr, " ~.\tTerminate program\r\n");
|
|
fprintf(stderr, " ~?\tThis help\r\n");
|
|
}
|
|
|
|
static void
|
|
ReadTty(void)
|
|
{
|
|
int n;
|
|
char ch;
|
|
static int ttystate;
|
|
char linebuff[LINE_LEN];
|
|
|
|
LogPrintf(LogDEBUG, "termode = %d, netfd = %d, mode = %d\n",
|
|
TermMode, netfd, mode);
|
|
if (!TermMode) {
|
|
n = read(netfd, linebuff, sizeof linebuff - 1);
|
|
if (n > 0) {
|
|
aft_cmd = 1;
|
|
if (linebuff[n-1] == '\n')
|
|
linebuff[--n] = '\0';
|
|
else
|
|
linebuff[n] = '\0';
|
|
if (n)
|
|
DecodeCommand(linebuff, n, IsInteractive(0) ? NULL : "Client");
|
|
Prompt();
|
|
} else if (n <= 0) {
|
|
LogPrintf(LogPHASE, "Client connection closed.\n");
|
|
DropClient(0);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We are in terminal mode, decode special sequences
|
|
*/
|
|
n = read(netfd, &ch, 1);
|
|
LogPrintf(LogDEBUG, "Got %d bytes (reading from the terminal)\n", n);
|
|
|
|
if (n > 0) {
|
|
switch (ttystate) {
|
|
case 0:
|
|
if (ch == '~')
|
|
ttystate++;
|
|
else
|
|
write(modem, &ch, n);
|
|
break;
|
|
case 1:
|
|
switch (ch) {
|
|
case '?':
|
|
ShowHelp();
|
|
break;
|
|
case 'p':
|
|
|
|
/*
|
|
* XXX: Should check carrier.
|
|
*/
|
|
if (LcpFsm.state <= ST_CLOSED) {
|
|
VarOpenMode = OPEN_ACTIVE;
|
|
PacketMode();
|
|
}
|
|
break;
|
|
case '.':
|
|
TermMode = 1;
|
|
aft_cmd = 1;
|
|
TtyCommandMode(1);
|
|
break;
|
|
case 't':
|
|
if (LogIsKept(LogDEBUG)) {
|
|
ShowTimers();
|
|
break;
|
|
}
|
|
case 'm':
|
|
if (LogIsKept(LogDEBUG)) {
|
|
ShowMemMap(NULL);
|
|
break;
|
|
}
|
|
default:
|
|
if (write(modem, &ch, n) < 0)
|
|
LogPrintf(LogERROR, "error writing to modem.\n");
|
|
break;
|
|
}
|
|
ttystate = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Here, we'll try to detect HDLC frame
|
|
*/
|
|
|
|
static const char *FrameHeaders[] = {
|
|
"\176\377\003\300\041",
|
|
"\176\377\175\043\300\041",
|
|
"\176\177\175\043\100\041",
|
|
"\176\175\337\175\043\300\041",
|
|
"\176\175\137\175\043\100\041",
|
|
NULL,
|
|
};
|
|
|
|
static const u_char *
|
|
HdlcDetect(u_char * cp, int n)
|
|
{
|
|
const char *ptr, *fp, **hp;
|
|
|
|
cp[n] = '\0'; /* be sure to null terminated */
|
|
ptr = NULL;
|
|
for (hp = FrameHeaders; *hp; hp++) {
|
|
fp = *hp;
|
|
if (DEV_IS_SYNC)
|
|
fp++;
|
|
ptr = strstr((char *) cp, fp);
|
|
if (ptr)
|
|
break;
|
|
}
|
|
return ((const u_char *) ptr);
|
|
}
|
|
|
|
static struct pppTimer RedialTimer;
|
|
|
|
static void
|
|
RedialTimeout(void *v)
|
|
{
|
|
StopTimer(&RedialTimer);
|
|
LogPrintf(LogPHASE, "Redialing timer expired.\n");
|
|
}
|
|
|
|
static void
|
|
StartRedialTimer(int Timeout)
|
|
{
|
|
StopTimer(&RedialTimer);
|
|
|
|
if (Timeout) {
|
|
RedialTimer.state = TIMER_STOPPED;
|
|
|
|
if (Timeout > 0)
|
|
RedialTimer.load = Timeout * SECTICKS;
|
|
else
|
|
RedialTimer.load = (random() % REDIAL_PERIOD) * SECTICKS;
|
|
|
|
LogPrintf(LogPHASE, "Enter pause (%d) for redialing.\n",
|
|
RedialTimer.load / SECTICKS);
|
|
|
|
RedialTimer.func = RedialTimeout;
|
|
StartTimer(&RedialTimer);
|
|
}
|
|
}
|
|
|
|
#define IN_SIZE sizeof(struct sockaddr_in)
|
|
#define UN_SIZE sizeof(struct sockaddr_in)
|
|
#define ADDRSZ (IN_SIZE > UN_SIZE ? IN_SIZE : UN_SIZE)
|
|
|
|
static void
|
|
DoLoop(void)
|
|
{
|
|
fd_set rfds, wfds, efds;
|
|
int pri, i, n, wfd, nfds;
|
|
char hisaddr[ADDRSZ];
|
|
struct sockaddr *sa = (struct sockaddr *)hisaddr;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)hisaddr;
|
|
struct timeval timeout, *tp;
|
|
int ssize = ADDRSZ;
|
|
const u_char *cp;
|
|
int tries;
|
|
int qlen;
|
|
int res;
|
|
struct tun_data tun;
|
|
#define rbuff tun.data
|
|
|
|
if (mode & MODE_DIRECT) {
|
|
LogPrintf(LogDEBUG, "Opening modem\n");
|
|
if (OpenModem() < 0)
|
|
return;
|
|
LogPrintf(LogPHASE, "Packet mode enabled\n");
|
|
PacketMode();
|
|
} else if (mode & MODE_DEDICATED) {
|
|
if (modem < 0)
|
|
while (OpenModem() < 0)
|
|
nointr_sleep(VarReconnectTimer);
|
|
}
|
|
fflush(VarTerm);
|
|
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = 0;
|
|
reconnectState = RECON_UNKNOWN;
|
|
|
|
if (mode & MODE_BACKGROUND)
|
|
dial_up = 1; /* Bring the line up */
|
|
else
|
|
dial_up = 0; /* XXXX */
|
|
tries = 0;
|
|
for (;;) {
|
|
nfds = 0;
|
|
FD_ZERO(&rfds);
|
|
FD_ZERO(&wfds);
|
|
FD_ZERO(&efds);
|
|
|
|
/*
|
|
* If the link is down and we're in DDIAL mode, bring it back up.
|
|
*/
|
|
if (mode & MODE_DDIAL && LcpFsm.state <= ST_CLOSED)
|
|
dial_up = 1;
|
|
|
|
/*
|
|
* If we lost carrier and want to re-establish the connection due to the
|
|
* "set reconnect" value, we'd better bring the line back up.
|
|
*/
|
|
if (LcpFsm.state <= ST_CLOSED) {
|
|
if (!dial_up && reconnectState == RECON_TRUE) {
|
|
if (++reconnectCount <= VarReconnectTries) {
|
|
LogPrintf(LogPHASE, "Connection lost, re-establish (%d/%d)\n",
|
|
reconnectCount, VarReconnectTries);
|
|
StartRedialTimer(VarReconnectTimer);
|
|
dial_up = 1;
|
|
} else {
|
|
if (VarReconnectTries)
|
|
LogPrintf(LogPHASE, "Connection lost, maximum (%d) times\n",
|
|
VarReconnectTries);
|
|
reconnectCount = 0;
|
|
if (mode & MODE_BACKGROUND)
|
|
Cleanup(EX_DEAD);
|
|
}
|
|
reconnectState = RECON_ENVOKED;
|
|
} else if (mode & MODE_DEDICATED)
|
|
if (VarOpenMode == OPEN_ACTIVE)
|
|
PacketMode();
|
|
}
|
|
|
|
/*
|
|
* If Ip packet for output is enqueued and require dial up, Just do it!
|
|
*/
|
|
if (dial_up && RedialTimer.state != TIMER_RUNNING) {
|
|
LogPrintf(LogDEBUG, "going to dial: modem = %d\n", modem);
|
|
if (OpenModem() < 0) {
|
|
tries++;
|
|
if (!(mode & MODE_DDIAL) && VarDialTries)
|
|
LogPrintf(LogCHAT, "Failed to open modem (attempt %u of %d)\n",
|
|
tries, VarDialTries);
|
|
else
|
|
LogPrintf(LogCHAT, "Failed to open modem (attempt %u)\n", tries);
|
|
|
|
if (!(mode & MODE_DDIAL) && VarDialTries && tries >= VarDialTries) {
|
|
if (mode & MODE_BACKGROUND)
|
|
Cleanup(EX_DIAL); /* Can't get the modem */
|
|
dial_up = 0;
|
|
reconnectState = RECON_UNKNOWN;
|
|
reconnectCount = 0;
|
|
tries = 0;
|
|
} else
|
|
StartRedialTimer(VarRedialTimeout);
|
|
} else {
|
|
tries++; /* Tries are per number, not per list of
|
|
* numbers. */
|
|
if (!(mode & MODE_DDIAL) && VarDialTries)
|
|
LogPrintf(LogCHAT, "Dial attempt %u of %d\n", tries, VarDialTries);
|
|
else
|
|
LogPrintf(LogCHAT, "Dial attempt %u\n", tries);
|
|
|
|
if ((res = DialModem()) == EX_DONE) {
|
|
nointr_sleep(1); /* little pause to allow peer starts */
|
|
ModemTimeout(NULL);
|
|
PacketMode();
|
|
dial_up = 0;
|
|
reconnectState = RECON_UNKNOWN;
|
|
tries = 0;
|
|
} else {
|
|
if (mode & MODE_BACKGROUND) {
|
|
if (VarNextPhone == NULL || res == EX_SIG)
|
|
Cleanup(EX_DIAL); /* Tried all numbers - no luck */
|
|
else
|
|
/* Try all numbers in background mode */
|
|
StartRedialTimer(VarRedialNextTimeout);
|
|
} else if (!(mode & MODE_DDIAL) &&
|
|
((VarDialTries && tries >= VarDialTries) ||
|
|
res == EX_SIG)) {
|
|
/* I give up ! Can't get through :( */
|
|
StartRedialTimer(VarRedialTimeout);
|
|
dial_up = 0;
|
|
reconnectState = RECON_UNKNOWN;
|
|
reconnectCount = 0;
|
|
tries = 0;
|
|
} else if (VarNextPhone == NULL)
|
|
/* Dial failed. Keep quite during redial wait period. */
|
|
StartRedialTimer(VarRedialTimeout);
|
|
else
|
|
StartRedialTimer(VarRedialNextTimeout);
|
|
}
|
|
}
|
|
}
|
|
qlen = ModemQlen();
|
|
|
|
if (qlen == 0) {
|
|
IpStartOutput();
|
|
qlen = ModemQlen();
|
|
}
|
|
if (modem >= 0) {
|
|
if (modem + 1 > nfds)
|
|
nfds = modem + 1;
|
|
FD_SET(modem, &rfds);
|
|
FD_SET(modem, &efds);
|
|
if (qlen > 0) {
|
|
FD_SET(modem, &wfds);
|
|
}
|
|
}
|
|
if (server >= 0) {
|
|
if (server + 1 > nfds)
|
|
nfds = server + 1;
|
|
FD_SET(server, &rfds);
|
|
}
|
|
|
|
#ifndef SIGALRM
|
|
/*
|
|
* *** IMPORTANT ***
|
|
* CPU is serviced every TICKUNIT micro seconds. This value must be chosen
|
|
* with great care. If this values is too big, it results in loss of
|
|
* characters from the modem and poor response. If this value is too
|
|
* small, ppp eats too much CPU time.
|
|
*/
|
|
usleep(TICKUNIT);
|
|
TimerService();
|
|
#else
|
|
handle_signals();
|
|
#endif
|
|
|
|
/* If there are aren't many packets queued, look for some more. */
|
|
if (qlen < 20 && tun_in >= 0) {
|
|
if (tun_in + 1 > nfds)
|
|
nfds = tun_in + 1;
|
|
FD_SET(tun_in, &rfds);
|
|
}
|
|
if (netfd >= 0) {
|
|
if (netfd + 1 > nfds)
|
|
nfds = netfd + 1;
|
|
FD_SET(netfd, &rfds);
|
|
FD_SET(netfd, &efds);
|
|
}
|
|
#ifndef SIGALRM
|
|
|
|
/*
|
|
* Normally, select() will not block because modem is writable. In AUTO
|
|
* mode, select will block until we find packet from tun
|
|
*/
|
|
tp = (RedialTimer.state == TIMER_RUNNING) ? &timeout : NULL;
|
|
i = select(nfds, &rfds, &wfds, &efds, tp);
|
|
#else
|
|
|
|
/*
|
|
* When SIGALRM timer is running, a select function will be return -1 and
|
|
* EINTR after a Time Service signal hundler is done. If the redial
|
|
* timer is not running and we are trying to dial, poll with a 0 value
|
|
* timer.
|
|
*/
|
|
tp = (dial_up && RedialTimer.state != TIMER_RUNNING) ? &timeout : NULL;
|
|
i = select(nfds, &rfds, &wfds, &efds, tp);
|
|
#endif
|
|
|
|
if (i == 0) {
|
|
continue;
|
|
}
|
|
if (i < 0) {
|
|
if (errno == EINTR) {
|
|
handle_signals();
|
|
continue;
|
|
}
|
|
LogPrintf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
|
|
break;
|
|
}
|
|
if ((netfd >= 0 && FD_ISSET(netfd, &efds)) || (modem >= 0 && FD_ISSET(modem, &efds))) {
|
|
LogPrintf(LogALERT, "Exception detected.\n");
|
|
break;
|
|
}
|
|
if (server >= 0 && FD_ISSET(server, &rfds)) {
|
|
wfd = accept(server, sa, &ssize);
|
|
if (wfd < 0) {
|
|
LogPrintf(LogERROR, "DoLoop: accept(): %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
switch (sa->sa_family) {
|
|
case AF_LOCAL:
|
|
LogPrintf(LogPHASE, "Connected to local client.\n");
|
|
break;
|
|
case AF_INET:
|
|
if (ntohs(sin->sin_port) < 1024) {
|
|
LogPrintf(LogALERT, "Rejected client connection from %s:%u"
|
|
"(invalid port number) !\n",
|
|
inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));
|
|
close(wfd);
|
|
continue;
|
|
}
|
|
LogPrintf(LogPHASE, "Connected to client from %s:%u\n",
|
|
inet_ntoa(sin->sin_addr), sin->sin_port);
|
|
break;
|
|
default:
|
|
write(wfd, "Unrecognised access !\n", 22);
|
|
close(wfd);
|
|
continue;
|
|
}
|
|
if (netfd >= 0) {
|
|
write(wfd, "Connection already in use.\n", 27);
|
|
close(wfd);
|
|
continue;
|
|
}
|
|
netfd = wfd;
|
|
VarTerm = fdopen(netfd, "a+");
|
|
LocalAuthInit();
|
|
Greetings();
|
|
IsInteractive(1);
|
|
Prompt();
|
|
}
|
|
if (netfd >= 0 && FD_ISSET(netfd, &rfds))
|
|
/* something to read from tty */
|
|
ReadTty();
|
|
if (modem >= 0 && FD_ISSET(modem, &wfds)) {
|
|
/* ready to write into modem */
|
|
ModemStartOutput(modem);
|
|
if (modem < 0)
|
|
dial_up = 1;
|
|
}
|
|
if (modem >= 0 && FD_ISSET(modem, &rfds)) {
|
|
/* something to read from modem */
|
|
if (LcpFsm.state <= ST_CLOSED)
|
|
nointr_usleep(10000);
|
|
n = read(modem, rbuff, sizeof rbuff);
|
|
if ((mode & MODE_DIRECT) && n <= 0) {
|
|
DownConnection();
|
|
} else
|
|
LogDumpBuff(LogASYNC, "ReadFromModem", rbuff, n);
|
|
|
|
if (LcpFsm.state <= ST_CLOSED) {
|
|
/*
|
|
* In dedicated mode, we just discard input until LCP is started.
|
|
*/
|
|
if (!(mode & MODE_DEDICATED)) {
|
|
cp = HdlcDetect(rbuff, n);
|
|
if (cp) {
|
|
/*
|
|
* LCP packet is detected. Turn ourselves into packet mode.
|
|
*/
|
|
if (cp != rbuff) {
|
|
write(modem, rbuff, cp - rbuff);
|
|
write(modem, "\r\n", 2);
|
|
}
|
|
PacketMode();
|
|
} else
|
|
write(fileno(VarTerm), rbuff, n);
|
|
}
|
|
} else {
|
|
if (n > 0)
|
|
AsyncInput(rbuff, n);
|
|
}
|
|
}
|
|
if (tun_in >= 0 && FD_ISSET(tun_in, &rfds)) { /* something to read
|
|
* from tun */
|
|
n = read(tun_in, &tun, sizeof tun);
|
|
if (n < 0) {
|
|
LogPrintf(LogERROR, "read from tun: %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
n -= sizeof tun - sizeof tun.data;
|
|
if (n <= 0) {
|
|
LogPrintf(LogERROR, "read from tun: Only %d bytes read\n", n);
|
|
continue;
|
|
}
|
|
if (!tun_check_header(tun, AF_INET))
|
|
continue;
|
|
if (((struct ip *) rbuff)->ip_dst.s_addr == IpcpInfo.want_ipaddr.s_addr) {
|
|
/* we've been asked to send something addressed *to* us :( */
|
|
if (VarLoopback) {
|
|
pri = PacketCheck(rbuff, n, FL_IN);
|
|
if (pri >= 0) {
|
|
struct mbuf *bp;
|
|
|
|
#ifndef NOALIAS
|
|
if (mode & MODE_ALIAS) {
|
|
VarPacketAliasIn(rbuff, sizeof rbuff);
|
|
n = ntohs(((struct ip *) rbuff)->ip_len);
|
|
}
|
|
#endif
|
|
bp = mballoc(n, MB_IPIN);
|
|
memcpy(MBUF_CTOP(bp), rbuff, n);
|
|
IpInput(bp);
|
|
LogPrintf(LogDEBUG, "Looped back packet addressed to myself\n");
|
|
}
|
|
continue;
|
|
} else
|
|
LogPrintf(LogDEBUG, "Oops - forwarding packet addressed to myself\n");
|
|
}
|
|
|
|
/*
|
|
* Process on-demand dialup. Output packets are queued within tunnel
|
|
* device until IPCP is opened.
|
|
*/
|
|
if (LcpFsm.state <= ST_CLOSED && (mode & MODE_AUTO) &&
|
|
(pri = PacketCheck(rbuff, n, FL_DIAL)) >= 0)
|
|
dial_up = 1;
|
|
|
|
pri = PacketCheck(rbuff, n, FL_OUT);
|
|
if (pri >= 0) {
|
|
#ifndef NOALIAS
|
|
if (mode & MODE_ALIAS) {
|
|
VarPacketAliasOut(rbuff, sizeof rbuff);
|
|
n = ntohs(((struct ip *) rbuff)->ip_len);
|
|
}
|
|
#endif
|
|
IpEnqueue(pri, rbuff, n);
|
|
}
|
|
}
|
|
}
|
|
LogPrintf(LogDEBUG, "Job (DoLoop) done.\n");
|
|
}
|