694 lines
14 KiB
C
694 lines
14 KiB
C
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/*
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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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* $Id:$
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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 "fsm.h"
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#include <fcntl.h>
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#include <sys/time.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <arpa/inet.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 "ipcp.h"
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#include "vars.h"
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extern void VjInit(), AsyncInit();
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extern void AsyncInput(), IpOutput();
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extern int SelectSystem();
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extern void DecodeCommand(), Prompt();
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extern int IsInteractive();
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extern struct in_addr ifnetmask;
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static void DoLoop(void);
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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 int TermMode;
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static int server, update;
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struct sockaddr_in ifsin;
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static void
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TtyInit()
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{
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struct termios newtio;
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int stat;
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stat = fcntl(0, F_GETFL, 0);
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stat |= O_NONBLOCK;
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fcntl(0, F_SETFL, stat);
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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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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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ioctl(0, TIOCSETA, &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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static void
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TtyCommandMode()
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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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ioctl(0, TIOCGETA, &newtio);
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newtio.c_lflag |= (ECHO|ICANON);
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newtio.c_iflag = oldtio.c_iflag;
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newtio.c_oflag |= OPOST;
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ioctl(0, TIOCSETA, &newtio);
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stat = fcntl(0, F_GETFL, 0);
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stat |= O_NONBLOCK;
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fcntl(0, F_SETFL, stat);
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TermMode = 0;
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Prompt(0);
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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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ioctl(0, TIOCSETA, &comtio);
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stat = fcntl(0, F_GETFL, 0);
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stat &= ~O_NONBLOCK;
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fcntl(0, F_SETFL, stat);
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TermMode = 1;
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}
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void
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Cleanup(excode)
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int excode;
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{
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int stat;
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OsLinkdown();
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stat = fcntl(0, F_GETFL, 0);
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stat &= ~O_NONBLOCK;
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fcntl(0, F_SETFL, stat);
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ioctl(0, TIOCSETA, &oldtio);
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OsCloseLink(1);
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sleep(1);
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if (mode & MODE_AUTO)
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DeleteIfRoutes(1);
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OsInterfaceDown(1);
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LogPrintf(LOG_PHASE, "PPP Terminated.\n");
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LogClose();
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if (server > 0)
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close(server);
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exit(excode);
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}
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static void
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Hangup()
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{
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LogPrintf(LOG_PHASE, "SIGHUP\n");
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signal(SIGHUP, Hangup);
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Cleanup(EX_HANGUP);
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}
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static void
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CloseSession()
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{
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LogPrintf(LOG_PHASE, "SIGTERM\n");
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LcpClose();
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Cleanup(EX_TERM);
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}
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void
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Usage()
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{
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fprintf(stderr, "Usage: ppp [-auto | -direct -dedicated] [system]\n");
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exit(EX_START);
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}
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void
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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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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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else if (strcmp(cp, "direct") == 0)
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mode |= MODE_DIRECT;
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else if (strcmp(cp, "dedicated") == 0)
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mode |= MODE_DEDICATED;
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else
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Usage();
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optc++;
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argv++; 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 (argc == 1) dstsystem = *argv;
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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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}
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static void
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Greetings()
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{
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printf("User Process PPP. Written by Toshiharu OHNO.\r\n");
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fflush(stdout);
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}
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void
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main(argc, argv)
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int argc;
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char **argv;
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{
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int tunno;
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int on = 1;
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argc--; argv++;
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mode = MODE_INTER; /* default operation is interactive mode */
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netfd = -1;
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ProcessArgs(argc, argv);
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Greetings();
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GetUid();
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IpcpDefAddress();
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if (SelectSystem("default", CONFFILE) < 0) {
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fprintf(stderr, "Warning: No default entry is given in config file.\n");
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}
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if (LogOpen())
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exit(EX_START);
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if (OpenTunnel(&tunno) < 0) {
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perror("open_tun");
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exit(EX_START);
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}
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if (mode & (MODE_AUTO|MODE_DIRECT|MODE_DEDICATED))
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mode &= ~MODE_INTER;
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if (mode & MODE_INTER) {
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printf("Interactive mode\n");
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netfd = 0;
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} else if (mode & MODE_AUTO) {
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printf("Automatic mode\n");
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if (dstsystem == NULL) {
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fprintf(stderr, "Destination system must be specified in auto mode.\n");
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exit(EX_START);
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}
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}
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ioctl(0, TIOCGETA, &oldtio); /* Save original tty mode */
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signal(SIGHUP, Hangup);
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signal(SIGTERM, CloseSession);
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signal(SIGINT, CloseSession);
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signal(SIGSEGV, Hangup);
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if (dstsystem) {
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if (SelectSystem(dstsystem, CONFFILE) < 0) {
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fprintf(stderr, "Destination system not found in conf file.\n");
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Cleanup(EX_START);
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}
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if ((mode & MODE_AUTO) && DefHisAddress.ipaddr.s_addr == INADDR_ANY) {
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fprintf(stderr, "Must specify dstaddr with auto mode.\n");
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Cleanup(EX_START);
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}
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}
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if (mode & MODE_DIRECT)
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printf("Packet mode enabled.\n");
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#ifdef notdef
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if (mode & MODE_AUTO) {
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OsSetIpaddress(IpcpInfo.want_ipaddr, IpcpInfo.his_ipaddr, ifnetmask);
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}
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#endif
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if (!(mode & MODE_INTER)) {
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int port = SERVER_PORT + tunno;
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/*
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* Create server socket and listen at there.
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*/
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server = socket(PF_INET, SOCK_STREAM, 0);
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if (server < 0) {
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perror("socket");
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Cleanup(EX_SOCK);
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}
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ifsin.sin_family = AF_INET;
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ifsin.sin_addr.s_addr = INADDR_ANY;
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ifsin.sin_port = htons(port);
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if (bind(server, (struct sockaddr *) &ifsin, sizeof(ifsin)) < 0) {
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perror("bind");
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if (errno == EADDRINUSE)
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fprintf(stderr, "Wait for a while, then try again.\n");
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Cleanup(EX_SOCK);
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}
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listen(server, 5);
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DupLog();
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if (!(mode & MODE_DIRECT)) {
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if (fork())
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exit(0);
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}
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LogPrintf(LOG_PHASE, "Listening at %d.\n", port);
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#ifdef DOTTYINIT
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if (mode & (MODE_DIRECT|MODE_DEDICATED)) {
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#else
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if (mode & MODE_DIRECT) {
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#endif
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TtyInit();
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} else {
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setsid(); /* detach control tty */
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}
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} else {
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server = -1;
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TtyInit();
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TtyCommandMode();
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}
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LogPrintf(LOG_PHASE, "PPP Started.\n");
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do
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DoLoop();
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while (mode & MODE_DEDICATED);
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Cleanup(EX_DONE);
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}
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/*
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* Turn into packet mode, where we speek PPP.
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*/
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void
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PacketMode()
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{
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if (RawModem(modem) < 0) {
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fprintf(stderr, "Not connected.\r\n");
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return;
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}
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AsyncInit();
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VjInit();
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LcpInit();
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IpcpInit();
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CcpInit();
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LcpUp();
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if (mode & (MODE_DIRECT|MODE_DEDICATED))
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LcpOpen(OPEN_ACTIVE);
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else
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LcpOpen(VarOpenMode);
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if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER) {
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TtyCommandMode();
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fprintf(stderr, "Packet mode.\r\n");
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}
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}
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static void
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ShowHelp()
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{
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fprintf(stderr, "Following commands are available\r\n");
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fprintf(stderr, " ~p\tEnter to Packet mode\r\n");
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fprintf(stderr, " ~.\tTerminate program\r\n");
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}
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static void
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ReadTty()
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{
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int n;
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char ch;
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static int ttystate;
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#define MAXLINESIZE 200
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char linebuff[MAXLINESIZE];
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#ifdef DEBUG
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logprintf("termode = %d, netfd = %d, mode = %d\n", TermMode, netfd, mode);
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#endif
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if (!TermMode) {
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n = read(netfd, linebuff, sizeof(linebuff)-1);
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if (n > 0)
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DecodeCommand(linebuff, n, 1);
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else {
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#ifdef DEBUG
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logprintf("connection closed.\n");
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#endif
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close(netfd);
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netfd = -1;
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mode &= ~MODE_INTER;
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}
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return;
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}
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/*
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* We are in terminal mode, decode special sequences
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*/
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n = read(0, &ch, 1);
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#ifdef DEBUG
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logprintf("got %d bytes\n", n);
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#endif
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if (n > 0) {
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switch (ttystate) {
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case 0:
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if (ch == '~')
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ttystate++;
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else
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write(modem, &ch, n);
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
switch (ch) {
|
||
|
|
case '?':
|
||
|
|
ShowHelp();
|
||
|
|
break;
|
||
|
|
case '-':
|
||
|
|
if (loglevel > 0) {
|
||
|
|
loglevel--;
|
||
|
|
fprintf(stderr, "New loglevel is %d\r\n", loglevel);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case '+':
|
||
|
|
loglevel++;
|
||
|
|
fprintf(stderr, "New loglevel is %d\r\n", loglevel);
|
||
|
|
break;
|
||
|
|
#ifdef DEBUG
|
||
|
|
case 'm':
|
||
|
|
ShowMemMap();
|
||
|
|
break;
|
||
|
|
#endif
|
||
|
|
case 'p':
|
||
|
|
/*
|
||
|
|
* XXX: Should check carrier.
|
||
|
|
*/
|
||
|
|
if (LcpFsm.state <= ST_CLOSED) {
|
||
|
|
VarOpenMode = OPEN_ACTIVE;
|
||
|
|
PacketMode();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
#ifdef DEBUG
|
||
|
|
case 't':
|
||
|
|
ShowTimers();
|
||
|
|
break;
|
||
|
|
#endif
|
||
|
|
case '.':
|
||
|
|
TermMode = 1;
|
||
|
|
TtyCommandMode();
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
if (write(modem, &ch, n) < 0)
|
||
|
|
fprintf(stderr, "err in write.\r\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
ttystate = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Here, we'll try to detect HDLC frame
|
||
|
|
*/
|
||
|
|
|
||
|
|
static char *FrameHeaders[] = {
|
||
|
|
"\176\177\175\043",
|
||
|
|
"\176\377\175\043",
|
||
|
|
"\176\175\137\175\043",
|
||
|
|
"\176\175\337\175\043",
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
u_char *
|
||
|
|
HdlcDetect(cp, n)
|
||
|
|
u_char *cp;
|
||
|
|
int n;
|
||
|
|
{
|
||
|
|
char *ptr, **hp;
|
||
|
|
|
||
|
|
cp[n] = '\0'; /* be sure to null terminated */
|
||
|
|
ptr = NULL;
|
||
|
|
for (hp = FrameHeaders; *hp; hp++) {
|
||
|
|
if (ptr = strstr((char *)cp, *hp))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return((u_char *)ptr);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct pppTimer RedialTimer;
|
||
|
|
|
||
|
|
static void
|
||
|
|
RedialTimeout()
|
||
|
|
{
|
||
|
|
StopTimer(&RedialTimer);
|
||
|
|
LogPrintf(LOG_PHASE, "Redialing timer expired.\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
StartRedialTimer()
|
||
|
|
{
|
||
|
|
LogPrintf(LOG_PHASE, "Enter pause for redialing.\n");
|
||
|
|
StopTimer(&RedialTimer);
|
||
|
|
RedialTimer.state = TIMER_STOPPED;
|
||
|
|
RedialTimer.load = REDIAL_PERIOD * SECTICKS;
|
||
|
|
RedialTimer.func = RedialTimeout;
|
||
|
|
StartTimer(&RedialTimer);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
DoLoop()
|
||
|
|
{
|
||
|
|
fd_set rfds, wfds, efds;
|
||
|
|
int pri, i, n, wfd;
|
||
|
|
struct sockaddr_in hisaddr;
|
||
|
|
struct timeval timeout, *tp;
|
||
|
|
int ssize = sizeof(hisaddr);
|
||
|
|
u_char *cp;
|
||
|
|
u_char rbuff[MAX_MRU];
|
||
|
|
|
||
|
|
if (mode & MODE_DIRECT) {
|
||
|
|
modem = OpenModem(mode);
|
||
|
|
fprintf(stderr, "Packet mode enabled\n");
|
||
|
|
PacketMode();
|
||
|
|
} else if (mode & MODE_DEDICATED) {
|
||
|
|
if (!modem)
|
||
|
|
modem = OpenModem(mode);
|
||
|
|
}
|
||
|
|
|
||
|
|
fflush(stdout);
|
||
|
|
|
||
|
|
timeout.tv_sec = 0;;
|
||
|
|
timeout.tv_usec = 0;
|
||
|
|
|
||
|
|
for (;;) {
|
||
|
|
IpStartOutput();
|
||
|
|
FD_ZERO(&rfds); FD_ZERO(&wfds); FD_ZERO(&efds);
|
||
|
|
FD_SET(tun_in, &rfds);
|
||
|
|
if (server > 0) FD_SET(server, &rfds);
|
||
|
|
|
||
|
|
/* *** IMPORTANT ***
|
||
|
|
*
|
||
|
|
* CPU is serviced every TICKUNIT micro seconds.
|
||
|
|
* This value must be chosen with great care. If this values is
|
||
|
|
* too big, it results loss of characters from modem and poor responce.
|
||
|
|
* If this values is too small, ppp process eats many CPU time.
|
||
|
|
*/
|
||
|
|
usleep(TICKUNIT);
|
||
|
|
TimerService();
|
||
|
|
|
||
|
|
if (modem) {
|
||
|
|
FD_SET(modem, &rfds);
|
||
|
|
FD_SET(modem, &efds);
|
||
|
|
FD_SET(modem, &wfds);
|
||
|
|
}
|
||
|
|
if (netfd > -1) {
|
||
|
|
FD_SET(netfd, &rfds);
|
||
|
|
FD_SET(netfd, &efds);
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* Normally, slect() will not block because modem is writable.
|
||
|
|
* In AUTO mode, select will block until we find packet from tun.
|
||
|
|
* However, we have to run ourselves while we are in redial wait state.
|
||
|
|
*/
|
||
|
|
tp = (RedialTimer.state == TIMER_RUNNING)? &timeout : NULL;
|
||
|
|
i = select(tun_in+10, &rfds, &wfds, &efds, tp);
|
||
|
|
if (i == 0) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (i < 0) {
|
||
|
|
perror("select");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ((netfd > 0 && FD_ISSET(netfd, &efds)) || FD_ISSET(modem, &efds)) {
|
||
|
|
logprintf("Exception detected.\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (server > 0 && FD_ISSET(server, &rfds)) {
|
||
|
|
#ifdef DEBUG
|
||
|
|
logprintf("connected to client.\n");
|
||
|
|
#endif
|
||
|
|
wfd = accept(server, (struct sockaddr *)&hisaddr, &ssize);
|
||
|
|
if (netfd > 0) {
|
||
|
|
write(wfd, "already in use.\n", 16);
|
||
|
|
close(wfd);
|
||
|
|
continue;
|
||
|
|
} else
|
||
|
|
netfd = wfd;
|
||
|
|
if (dup2(netfd, 1) < 0)
|
||
|
|
perror("dup2");
|
||
|
|
mode |= MODE_INTER;
|
||
|
|
Greetings();
|
||
|
|
(void) IsInteractive();
|
||
|
|
Prompt(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((mode & MODE_INTER) && FD_ISSET(netfd, &rfds)) {
|
||
|
|
/* something to read from tty */
|
||
|
|
ReadTty();
|
||
|
|
}
|
||
|
|
if (modem) {
|
||
|
|
if (FD_ISSET(modem, &wfds)) { /* ready to write into modem */
|
||
|
|
ModemStartOutput(modem);
|
||
|
|
}
|
||
|
|
if (FD_ISSET(modem, &rfds)) { /* something to read from modem */
|
||
|
|
n = read(modem, rbuff, sizeof(rbuff));
|
||
|
|
if ((mode & MODE_DIRECT) && n <= 0) {
|
||
|
|
DownConnection();
|
||
|
|
} else
|
||
|
|
LogDumpBuff(LOG_ASYNC, "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(1, rbuff, cp - rbuff);
|
||
|
|
write(1, "\r\n", 2);
|
||
|
|
}
|
||
|
|
PacketMode();
|
||
|
|
#ifdef notdef
|
||
|
|
AsyncInput(cp, n - (cp - rbuff));
|
||
|
|
#endif
|
||
|
|
} else
|
||
|
|
write(1, rbuff, n);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (n > 0)
|
||
|
|
AsyncInput(rbuff, n);
|
||
|
|
#ifdef notdef
|
||
|
|
continue; /* THIS LINE RESULT AS POOR PERFORMANCE */
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (FD_ISSET(tun_in, &rfds)) { /* something to read from tun */
|
||
|
|
/*
|
||
|
|
* If there are many packets queued, wait until they are drained.
|
||
|
|
*/
|
||
|
|
if (ModemQlen() > 5)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
n = read(tun_in, rbuff, sizeof(rbuff));
|
||
|
|
if (n < 0) {
|
||
|
|
perror("read from tun");
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* 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, 2);
|
||
|
|
if (pri >= 0) {
|
||
|
|
if (RedialTimer.state == TIMER_RUNNING) {
|
||
|
|
/*
|
||
|
|
* We are in redial wait state. Ignore packet.
|
||
|
|
*/
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
modem = OpenModem(mode);
|
||
|
|
#ifdef DEBUG
|
||
|
|
logprintf("going to dial: modem = %d\n", modem);
|
||
|
|
#endif
|
||
|
|
if (modem < 0) {
|
||
|
|
printf("failed to open modem.\n");
|
||
|
|
Cleanup(EX_MODEM);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (DialModem()) {
|
||
|
|
sleep(1); /* little pause to allow peer starts */
|
||
|
|
ModemTimeout();
|
||
|
|
PacketMode();
|
||
|
|
} else {
|
||
|
|
#ifdef notdef
|
||
|
|
Cleanup(EX_DIAL);
|
||
|
|
#endif
|
||
|
|
CloseModem();
|
||
|
|
/* Dial failed. Keep quite during redial wait period. */
|
||
|
|
/* XXX: We shoud implement re-dial */
|
||
|
|
StartRedialTimer();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
IpEnqueue(pri, rbuff, n);
|
||
|
|
}
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
pri = PacketCheck(rbuff, n, 1);
|
||
|
|
if (pri >= 0)
|
||
|
|
IpEnqueue(pri, rbuff, n);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
logprintf("job done.\n");
|
||
|
|
}
|