7308ec6890
IPCP, CCP and LCP are now just derived FSMs. Comment each of the FSM implementations so that we can tell what's going on. Revise the state transitions so that CCP and IPCP actually send terminate REQs when appropriate. The OS & IPCP layers are still like spagetti (next job).
1113 lines
27 KiB
C
1113 lines
27 KiB
C
/*
|
|
* User Process PPP
|
|
*
|
|
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
|
|
*
|
|
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the Internet Initiative Japan, Inc. The name of the
|
|
* IIJ may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* $Id: main.c,v 1.121.2.3 1998/01/30 19:45:53 brian Exp $
|
|
*
|
|
* TODO:
|
|
* o Add commands for traffic summary, version display, etc.
|
|
* o Add signal handler for misc controls.
|
|
*/
|
|
#include <sys/param.h>
|
|
#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 <net/if.h>
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|
#include <net/if_tun.h>
|
|
#include <netinet/in.h>
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|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
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|
#include <arpa/inet.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>
|
|
#include <termios.h>
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|
#include <unistd.h>
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|
|
|
#include "command.h"
|
|
#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 "iplist.h"
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|
#include "throughput.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"
|
|
#include "ip.h"
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|
#include "sig.h"
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|
#include "server.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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|
#include "link.h"
|
|
#include "physical.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
|
|
#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;
|
|
static char pid_filename[MAXPATHLEN];
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|
static int dial_up;
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|
|
|
static void DoLoop(void);
|
|
static void TerminalStop(int);
|
|
static const char *ex_desc(int);
|
|
|
|
static void
|
|
TtyInit(int DontWantInt)
|
|
{
|
|
struct termios newtio;
|
|
int stat;
|
|
|
|
stat = fcntl(netfd, F_GETFL, 0);
|
|
if (stat > 0) {
|
|
stat |= O_NONBLOCK;
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|
(void) fcntl(netfd, F_SETFL, stat);
|
|
}
|
|
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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|
|
|
/*
|
|
* Set tty into command mode. We allow canonical input and echo processing.
|
|
*/
|
|
void
|
|
TtyCommandMode(int prompt)
|
|
{
|
|
struct termios newtio;
|
|
int stat;
|
|
|
|
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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|
|
|
/*
|
|
* Set tty into terminal mode which is used while we invoke term command.
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|
*/
|
|
void
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|
TtyTermMode()
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|
{
|
|
int stat;
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|
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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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|
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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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link_Close(physical2link(pppVars.physical), 1); /* XXX gotta get a handle on
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* the logical link */
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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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|
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|
exit(excode);
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|
}
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|
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|
static void
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|
CloseConnection(int signo)
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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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|
LogPrintf(LogPHASE, "Signal %d, terminate.\n", signo);
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|
reconnect(RECON_FALSE);
|
|
LcpClose(&LcpInfo.fsm);
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|
Cleanup(EX_TERM);
|
|
}
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|
|
|
static void
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|
TerminalCont(int signo)
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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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|
{
|
|
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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|
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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)
|
|
{
|
|
VarHaveLocalAuthKey = 0;
|
|
LocalAuthInit();
|
|
ServerClose();
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|
}
|
|
|
|
static const char *
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|
ex_desc(int ex)
|
|
{
|
|
static char num[12];
|
|
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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|
|
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)
|
|
{
|
|
fprintf(stderr,
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|
"Usage: ppp [-auto | -background | -direct | -dedicated | -ddial ]"
|
|
#ifndef NOALIAS
|
|
" [ -alias ]"
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|
#endif
|
|
" [system]\n");
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|
exit(EX_START);
|
|
}
|
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|
|
static char *
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ProcessArgs(int argc, char **argv)
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|
{
|
|
int optc;
|
|
char *cp;
|
|
|
|
optc = 0;
|
|
mode = MODE_INTER;
|
|
while (argc > 0 && **argv == '-') {
|
|
cp = *argv + 1;
|
|
if (strcmp(cp, "auto") == 0) {
|
|
mode |= MODE_AUTO;
|
|
mode &= ~MODE_INTER;
|
|
} else if (strcmp(cp, "background") == 0) {
|
|
mode |= MODE_BACKGROUND;
|
|
mode &= ~MODE_INTER;
|
|
} else if (strcmp(cp, "direct") == 0) {
|
|
mode |= MODE_DIRECT;
|
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mode &= ~MODE_INTER;
|
|
} else if (strcmp(cp, "dedicated") == 0) {
|
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mode |= MODE_DEDICATED;
|
|
mode &= ~MODE_INTER;
|
|
} else if (strcmp(cp, "ddial") == 0) {
|
|
mode |= MODE_DDIAL;
|
|
mode &= ~MODE_INTER;
|
|
#ifndef NOALIAS
|
|
} else if (strcmp(cp, "alias") == 0) {
|
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if (loadAliasHandlers(&VarAliasHandlers) == 0)
|
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mode |= MODE_ALIAS;
|
|
else
|
|
LogPrintf(LogWARN, "Cannot load alias library\n");
|
|
optc--; /* this option isn't exclusive */
|
|
#endif
|
|
} else
|
|
Usage();
|
|
optc++;
|
|
argv++;
|
|
argc--;
|
|
}
|
|
if (argc > 1) {
|
|
fprintf(stderr, "specify only one system label.\n");
|
|
exit(EX_START);
|
|
}
|
|
|
|
if (optc > 1) {
|
|
fprintf(stderr, "specify only one mode.\n");
|
|
exit(EX_START);
|
|
}
|
|
|
|
return argc == 1 ? *argv : NULL; /* Don't SetLabel yet ! */
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
FILE *lockfile;
|
|
char *name, *label;
|
|
int nfds;
|
|
|
|
nfds = getdtablesize();
|
|
if (nfds >= FD_SETSIZE)
|
|
/*
|
|
* If we've got loads of file descriptors, make sure they're all
|
|
* closed. If they aren't, we may end up with a seg fault when our
|
|
* `fd_set's get too big when select()ing !
|
|
*/
|
|
while (--nfds > 2)
|
|
close(nfds);
|
|
|
|
VarTerm = 0;
|
|
name = strrchr(argv[0], '/');
|
|
LogOpen(name ? name + 1 : argv[0]);
|
|
|
|
tcgetattr(STDIN_FILENO, &oldtio); /* Save original tty mode */
|
|
|
|
argc--;
|
|
argv++;
|
|
label = ProcessArgs(argc, argv);
|
|
if (!(mode & MODE_DIRECT))
|
|
VarTerm = stdout;
|
|
|
|
ID0init();
|
|
if (ID0realuid() != 0) {
|
|
char conf[200], *ptr;
|
|
|
|
snprintf(conf, sizeof conf, "%s/%s", _PATH_PPP, CONFFILE);
|
|
do {
|
|
if (!access(conf, W_OK)) {
|
|
LogPrintf(LogALERT, "ppp: Access violation: Please protect %s\n", conf);
|
|
return -1;
|
|
}
|
|
ptr = conf + strlen(conf)-2;
|
|
while (ptr > conf && *ptr != '/')
|
|
*ptr-- = '\0';
|
|
} while (ptr >= conf);
|
|
}
|
|
|
|
if (!ValidSystem(label)) {
|
|
fprintf(stderr, "You may not use ppp in this mode with this label\n");
|
|
if (mode & MODE_DIRECT) {
|
|
const char *l;
|
|
l = label ? label : "default";
|
|
LogPrintf(LogWARN, "Label %s rejected -direct connection\n", l);
|
|
}
|
|
LogClose();
|
|
return 1;
|
|
}
|
|
|
|
if (!GetShortHost())
|
|
return 1;
|
|
IsInteractive(1);
|
|
IpcpDefAddress();
|
|
|
|
if (mode & MODE_INTER)
|
|
VarLocalAuth = LOCAL_AUTH;
|
|
|
|
if (SelectSystem("default", CONFFILE) < 0 && VarTerm)
|
|
fprintf(VarTerm, "Warning: No default entry is given in config file.\n");
|
|
|
|
if (OpenTunnel(&tunno) < 0) {
|
|
LogPrintf(LogWARN, "OpenTunnel: %s\n", strerror(errno));
|
|
return EX_START;
|
|
}
|
|
CleanInterface(IfDevName);
|
|
if ((mode & MODE_OUTGOING_DAEMON) && !(mode & MODE_DEDICATED))
|
|
if (label == NULL) {
|
|
if (VarTerm)
|
|
fprintf(VarTerm, "Destination system must be specified in"
|
|
" auto, background or ddial mode.\n");
|
|
return EX_START;
|
|
}
|
|
|
|
pending_signal(SIGHUP, CloseSession);
|
|
pending_signal(SIGTERM, CloseSession);
|
|
pending_signal(SIGINT, CloseConnection);
|
|
pending_signal(SIGQUIT, CloseSession);
|
|
#ifdef SIGPIPE
|
|
signal(SIGPIPE, SIG_IGN);
|
|
#endif
|
|
#ifdef SIGALRM
|
|
pending_signal(SIGALRM, SIG_IGN);
|
|
#endif
|
|
if (mode & MODE_INTER) {
|
|
#ifdef SIGTSTP
|
|
pending_signal(SIGTSTP, TerminalStop);
|
|
#endif
|
|
#ifdef SIGTTIN
|
|
pending_signal(SIGTTIN, TerminalStop);
|
|
#endif
|
|
#ifdef SIGTTOU
|
|
pending_signal(SIGTTOU, SIG_IGN);
|
|
#endif
|
|
}
|
|
if (!(mode & MODE_INTER)) {
|
|
#ifdef SIGUSR1
|
|
pending_signal(SIGUSR1, SetUpServer);
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
pending_signal(SIGUSR2, BringDownServer);
|
|
#endif
|
|
}
|
|
|
|
if (label) {
|
|
if (SelectSystem(label, CONFFILE) < 0) {
|
|
LogPrintf(LogWARN, "Destination system %s not found in conf file.\n",
|
|
GetLabel());
|
|
Cleanup(EX_START);
|
|
}
|
|
/*
|
|
* We don't SetLabel() 'till now in case SelectSystem() has an
|
|
* embeded load "otherlabel" command.
|
|
*/
|
|
SetLabel(label);
|
|
if (mode & MODE_OUTGOING_DAEMON &&
|
|
IpcpInfo.DefHisAddress.ipaddr.s_addr == INADDR_ANY) {
|
|
LogPrintf(LogWARN, "You must \"set ifaddr\" in label %s for"
|
|
" auto, background or ddial mode.\n", label);
|
|
Cleanup(EX_START);
|
|
}
|
|
}
|
|
|
|
if (mode & MODE_DAEMON) {
|
|
if (mode & MODE_BACKGROUND) {
|
|
if (pipe(BGFiledes)) {
|
|
LogPrintf(LogERROR, "pipe: %s\n", strerror(errno));
|
|
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. */
|
|
BGPid = bgpid;
|
|
close(BGFiledes[1]);
|
|
if (read(BGFiledes[0], &c, 1) != 1) {
|
|
fprintf(VarTerm, "Child exit, no status.\n");
|
|
LogPrintf(LogPHASE, "Parent: Child exit, no status.\n");
|
|
} else if (c == EX_NORMAL) {
|
|
fprintf(VarTerm, "PPP enabled.\n");
|
|
LogPrintf(LogPHASE, "Parent: PPP enabled.\n");
|
|
} else {
|
|
fprintf(VarTerm, "Child failed (%s).\n", ex_desc((int) c));
|
|
LogPrintf(LogPHASE, "Parent: Child failed (%s).\n",
|
|
ex_desc((int) c));
|
|
}
|
|
close(BGFiledes[0]);
|
|
}
|
|
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);
|
|
}
|
|
#ifndef RELEASE_CRUNCH
|
|
else
|
|
LogPrintf(LogALERT, "Warning: Can't create %s: %s\n",
|
|
pid_filename, strerror(errno));
|
|
#endif
|
|
|
|
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(int delay)
|
|
{
|
|
if (RawModem(pppVars.physical) < 0) {
|
|
LogPrintf(LogWARN, "PacketMode: Not connected.\n");
|
|
return;
|
|
}
|
|
AsyncInit();
|
|
VjInit(15);
|
|
LcpInit(pppVars.physical);
|
|
IpcpInit(physical2link(pppVars.physical));
|
|
CcpInit(physical2link(pppVars.physical));
|
|
LcpUp();
|
|
|
|
LcpOpen(delay);
|
|
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
|
|
/* XXX missing return value check */
|
|
Physical_Write(pppVars.physical, &ch, n);
|
|
break;
|
|
case 1:
|
|
switch (ch) {
|
|
case '?':
|
|
ShowHelp();
|
|
break;
|
|
case 'p':
|
|
|
|
/*
|
|
* XXX: Should check carrier.
|
|
*/
|
|
if (LcpInfo.fsm.state <= ST_CLOSED)
|
|
PacketMode(0);
|
|
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 (Physical_Write(pppVars.physical, &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(struct physical *physical, 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 (Physical_IsSync(physical))
|
|
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(pppVars.physical) < 0)
|
|
return;
|
|
LogPrintf(LogPHASE, "Packet mode enabled\n");
|
|
PacketMode(VarOpenMode);
|
|
} else if (mode & MODE_DEDICATED) {
|
|
if (!link_IsActive(physical2link(pppVars.physical)))
|
|
while (OpenModem(pppVars.physical) < 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 && LcpInfo.fsm.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 (LcpInfo.fsm.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)
|
|
PacketMode(VarOpenMode);
|
|
}
|
|
|
|
/*
|
|
* 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",
|
|
Physical_GetFD(pppVars.physical));
|
|
if (OpenModem(pppVars.physical) < 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(pppVars.physical)) == EX_DONE) {
|
|
ModemTimeout(pppVars.physical);
|
|
PacketMode(VarOpenMode);
|
|
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 = link_QueueLen(physical2link(pppVars.physical));
|
|
if (qlen == 0) {
|
|
IpStartOutput(physical2link(pppVars.physical));
|
|
qlen = link_QueueLen(physical2link(pppVars.physical));
|
|
}
|
|
|
|
if (link_IsActive(physical2link(pppVars.physical))) {
|
|
/* XXX-ML this should probably be abstracted */
|
|
if (Physical_GetFD(pppVars.physical) + 1 > nfds)
|
|
nfds = Physical_GetFD(pppVars.physical) + 1;
|
|
Physical_FD_SET(pppVars.physical, &rfds);
|
|
Physical_FD_SET(pppVars.physical, &efds);
|
|
if (qlen > 0) {
|
|
Physical_FD_SET(pppVars.physical, &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)) ||
|
|
(Physical_FD_ISSET(pppVars.physical, &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();
|
|
IsInteractive(1);
|
|
Prompt();
|
|
}
|
|
if (netfd >= 0 && FD_ISSET(netfd, &rfds))
|
|
/* something to read from tty */
|
|
ReadTty();
|
|
if (Physical_FD_ISSET(pppVars.physical, &wfds)) {
|
|
/* ready to write into modem */
|
|
link_StartOutput(physical2link(pppVars.physical));
|
|
if (!link_IsActive(physical2link(pppVars.physical)))
|
|
dial_up = 1;
|
|
}
|
|
if (Physical_FD_ISSET(pppVars.physical, &rfds)) {
|
|
/* something to read from modem */
|
|
if (LcpInfo.fsm.state <= ST_CLOSED)
|
|
nointr_usleep(10000);
|
|
n = Physical_Read(pppVars.physical, rbuff, sizeof rbuff);
|
|
if ((mode & MODE_DIRECT) && n <= 0) {
|
|
DownConnection();
|
|
} else
|
|
LogDumpBuff(LogASYNC, "ReadFromModem", rbuff, n);
|
|
|
|
if (LcpInfo.fsm.state <= ST_CLOSED) {
|
|
/*
|
|
* In dedicated mode, we just discard input until LCP is started.
|
|
*/
|
|
if (!(mode & MODE_DEDICATED)) {
|
|
cp = HdlcDetect(pppVars.physical, rbuff, n);
|
|
if (cp) {
|
|
/*
|
|
* LCP packet is detected. Turn ourselves into packet mode.
|
|
*/
|
|
if (cp != rbuff) {
|
|
/* XXX missing return value checks */
|
|
Physical_Write(pppVars.physical, rbuff, cp - rbuff);
|
|
Physical_Write(pppVars.physical, "\r\n", 2);
|
|
}
|
|
PacketMode(0);
|
|
} else
|
|
write(fileno(VarTerm), rbuff, n);
|
|
}
|
|
} else {
|
|
if (n > 0)
|
|
AsyncInput(rbuff, n, pppVars.physical);
|
|
}
|
|
}
|
|
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 (LcpInfo.fsm.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");
|
|
}
|