/* * 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 1.60 1997/06/09 03:27:28 brian Exp $ * * TODO: * o Add commands for traffic summary, version display, etc. * o Add signal handler for misc controls. */ #include "fsm.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "modem.h" #include "os.h" #include "hdlc.h" #include "ccp.h" #include "lcp.h" #include "ipcp.h" #include "loadalias.h" #include "vars.h" #include "auth.h" #include "filter.h" #include "systems.h" #include "ip.h" #include "sig.h" #define LAUTH_M1 "Warning: No password entry for this host in ppp.secret\n" #define LAUTH_M2 "Warning: Manipulation is allowed by anyone\n" #ifndef O_NONBLOCK #ifdef O_NDELAY #define O_NONBLOCK O_NDELAY #endif #endif extern void VjInit(), AsyncInit(); extern void AsyncInput(); extern int SelectSystem(); extern void DecodeCommand(), Prompt(); extern int aft_cmd; extern int IsInteractive(); static void DoLoop(void); static void TerminalStop(); static char *ex_desc(); static struct termios oldtio; /* Original tty mode */ static struct termios comtio; /* Command level tty mode */ int TermMode; static int server; static pid_t BGPid = 0; struct sockaddr_in ifsin; static char pid_filename[MAXPATHLEN]; static char if_filename[MAXPATHLEN]; int tunno; static void TtyInit() { struct termios newtio; int stat; stat = fcntl(0, F_GETFL, 0); if (stat > 0) { stat |= O_NONBLOCK; (void)fcntl(0, F_SETFL, stat); } newtio = oldtio; newtio.c_lflag &= ~(ECHO|ISIG|ICANON); newtio.c_iflag = 0; newtio.c_oflag &= ~OPOST; newtio.c_cc[VEOF] = _POSIX_VDISABLE; newtio.c_cc[VINTR] = _POSIX_VDISABLE; newtio.c_cc[VMIN] = 1; newtio.c_cc[VTIME] = 0; newtio.c_cflag |= CS8; tcsetattr(0, TCSADRAIN, &newtio); comtio = newtio; } /* * Set tty into command mode. We allow canonical input and echo processing. */ void TtyCommandMode(prompt) int prompt; { struct termios newtio; int stat; if (!(mode & MODE_INTER)) return; tcgetattr(0, &newtio); newtio.c_lflag |= (ECHO|ISIG|ICANON); newtio.c_iflag = oldtio.c_iflag; newtio.c_oflag |= OPOST; tcsetattr(0, TCSADRAIN, &newtio); stat = fcntl(0, F_GETFL, 0); if (stat > 0) { stat |= O_NONBLOCK; (void)fcntl(0, F_SETFL, stat); } TermMode = 0; if(prompt) Prompt(); } /* * Set tty into terminal mode which is used while we invoke term command. */ void TtyTermMode() { int stat; tcsetattr(0, TCSADRAIN, &comtio); stat = fcntl(0, F_GETFL, 0); if (stat > 0) { stat &= ~O_NONBLOCK; (void)fcntl(0, F_SETFL, stat); } TermMode = 1; } void TtyOldMode() { int stat; stat = fcntl(0, F_GETFL, 0); if (stat > 0) { stat &= ~O_NONBLOCK; (void)fcntl(0, F_SETFL, stat); } tcsetattr(0, TCSANOW, &oldtio); } void Cleanup(excode) int excode; { OsLinkdown(); OsCloseLink(1); sleep(1); if (mode & MODE_AUTO) DeleteIfRoutes(1); (void)unlink(pid_filename); (void)unlink(if_filename); OsInterfaceDown(1); if (mode & MODE_BACKGROUND && BGFiledes[1] != -1) { char c = EX_ERRDEAD; if (write(BGFiledes[1],&c,1) == 1) LogPrintf(LogPHASE,"Parent notified of failure.\n"); else LogPrintf(LogPHASE,"Failed to notify parent of failure.\n"); close(BGFiledes[1]); } LogPrintf(LogPHASE, "PPP Terminated (%s).\n",ex_desc(excode)); LogClose(); if (server >= 0) { close(server); server = -1; } TtyOldMode(); exit(excode); } static void Hangup(signo) int signo; { #ifdef TRAPSEGV if (signo == SIGSEGV) { LogPrintf(LogPHASE, "Signal %d, core dump.\n", signo); LogClose(); abort(); } #endif if (BGPid) { kill (BGPid, SIGTERM); exit (EX_HANGUP); } else { LogPrintf(LogPHASE, "Signal %d, hangup.\n", signo); Cleanup(EX_HANGUP); } } static void CloseSession(signo) int signo; { if (BGPid) { kill (BGPid, SIGINT); exit (EX_TERM); } LogPrintf(LogPHASE, "Signal %d, terminate.\n", signo); reconnect(RECON_FALSE); LcpClose(); Cleanup(EX_TERM); } static void TerminalCont() { pending_signal(SIGCONT, SIG_DFL); pending_signal(SIGTSTP, TerminalStop); TtyCommandMode(getpgrp() == tcgetpgrp(0)); } static void TerminalStop(signo) int signo; { pending_signal(SIGCONT, TerminalCont); TtyOldMode(); pending_signal(SIGTSTP, SIG_DFL); kill(getpid(), signo); } static char * ex_desc(int ex) { static char num[12]; static char *desc[] = { "normal", "start", "sock", "modem", "dial", "dead", "done", "reboot", "errdead", "hangup", "term", "nodial", "nologin" }; if (ex >= 0 && ex < sizeof(desc)/sizeof(*desc)) return desc[ex]; snprintf(num, sizeof num, "%d", ex); return num; } void Usage() { fprintf(stderr, "Usage: ppp [-auto | -background | -direct | -dedicated | -ddial ] [ -alias ] [system]\n"); exit(EX_START); } void ProcessArgs(int argc, char **argv) { int optc; char *cp; optc = 0; while (argc > 0 && **argv == '-') { cp = *argv + 1; if (strcmp(cp, "auto") == 0) mode |= MODE_AUTO; else if (strcmp(cp, "background") == 0) mode |= MODE_BACKGROUND|MODE_AUTO; else if (strcmp(cp, "direct") == 0) mode |= MODE_DIRECT; else if (strcmp(cp, "dedicated") == 0) mode |= MODE_DEDICATED; else if (strcmp(cp, "ddial") == 0) mode |= MODE_DDIAL|MODE_AUTO; else if (strcmp(cp, "alias") == 0) { if (loadAliasHandlers(&VarAliasHandlers) == 0) mode |= MODE_ALIAS; else LogPrintf(LogWARN, "Cannot load alias library\n"); optc--; /* this option isn't exclusive */ } else Usage(); optc++; argv++; argc--; } if (argc > 1) { fprintf(stderr, "specify only one system label.\n"); exit(EX_START); } if (argc == 1) dstsystem = *argv; if (optc > 1) { fprintf(stderr, "specify only one mode.\n"); exit(EX_START); } } static void Greetings() { if (VarTerm) { fprintf(VarTerm, "User Process PPP. Written by Toshiharu OHNO.\n"); fflush(VarTerm); } } void main(argc, argv) int argc; char **argv; { FILE *lockfile; char *name; VarTerm = 0; name = rindex(argv[0], '/'); LogOpen(name ? name+1 : argv[0]); argc--; argv++; mode = MODE_INTER; /* default operation is interactive mode */ netfd = server = modem = tun_in = -1; ProcessArgs(argc, argv); if (!(mode & MODE_DIRECT)) VarTerm = stdout; Greetings(); GetUid(); IpcpDefAddress(); if (SelectSystem("default", CONFFILE) < 0 && VarTerm) fprintf(VarTerm, "Warning: No default entry is given in config file.\n"); switch ( LocalAuthInit() ) { case NOT_FOUND: if (VarTerm) { fprintf(VarTerm,LAUTH_M1); fprintf(VarTerm,LAUTH_M2); fflush(VarTerm); } /* Fall down */ case VALID: VarLocalAuth = LOCAL_AUTH; break; default: break; } if (OpenTunnel(&tunno) < 0) { LogPrintf(LogWARN, "open_tun: %s", strerror(errno)); exit(EX_START); } if (mode & (MODE_AUTO|MODE_DIRECT|MODE_DEDICATED)) mode &= ~MODE_INTER; if (mode & MODE_INTER) { fprintf(VarTerm, "Interactive mode\n"); netfd = STDIN_FILENO; } else if (mode & MODE_AUTO) { fprintf(VarTerm, "Automatic Dialer mode\n"); if (dstsystem == NULL) { if (VarTerm) fprintf(VarTerm, "Destination system must be specified in" " auto, background or ddial mode.\n"); exit(EX_START); } } tcgetattr(0, &oldtio); /* Save original tty mode */ pending_signal(SIGHUP, Hangup); pending_signal(SIGTERM, CloseSession); pending_signal(SIGINT, CloseSession); pending_signal(SIGQUIT, CloseSession); #ifdef TRAPSEGV signal(SIGSEGV, Hangup); #endif #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 (dstsystem) { if (SelectSystem(dstsystem, CONFFILE) < 0) { LogPrintf(LogWARN, "Destination system not found in conf file.\n"); Cleanup(EX_START); } if ((mode & MODE_AUTO) && DefHisAddress.ipaddr.s_addr == INADDR_ANY) { LogPrintf(LogWARN, "Must specify dstaddr with" " auto, background or ddial mode.\n"); Cleanup(EX_START); } } if (!(mode & MODE_INTER)) { int port = SERVER_PORT + tunno; if (mode & MODE_BACKGROUND) { if (pipe (BGFiledes)) { LogPrintf(LogERROR, "pipe: %s", strerror(errno)); Cleanup(EX_SOCK); } } /* Create server socket and listen at there. */ server = socket(PF_INET, SOCK_STREAM, 0); if (server < 0) { LogPrintf(LogERROR, "socket: %s", strerror(errno)); Cleanup(EX_SOCK); } ifsin.sin_family = AF_INET; ifsin.sin_addr.s_addr = INADDR_ANY; ifsin.sin_port = htons(port); setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &server, sizeof server); if (bind(server, (struct sockaddr *) &ifsin, sizeof(ifsin)) < 0) { LogPrintf(LogERROR, "bind: %s", strerror(errno)); if (errno == EADDRINUSE && VarTerm) fprintf(VarTerm, "Wait for a while, then try again.\n"); Cleanup(EX_SOCK); } if (listen(server, 5) != 0) { LogPrintf(LogERROR, "Unable to listen to socket - OS overload?\n"); Cleanup(EX_SOCK); } if (!(mode & MODE_DIRECT)) { pid_t bgpid; bgpid = fork (); if (bgpid == -1) { LogPrintf(LogERROR, "fork: %s", 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]); } exit(c); } else if (mode & MODE_BACKGROUND) close(BGFiledes[0]); } snprintf(pid_filename, sizeof (pid_filename), "%stun%d.pid", _PATH_VARRUN, tunno); (void)unlink(pid_filename); if ((lockfile = fopen(pid_filename, "w")) != NULL) { fprintf(lockfile, "%d\n", (int)getpid()); fclose(lockfile); } else LogPrintf(LogALERT, "Warning: Can't create %s: %s\n", pid_filename, strerror(errno)); snprintf(if_filename, sizeof if_filename, "%s%s.if", _PATH_VARRUN, VarBaseDevice); (void)unlink(if_filename); if ((lockfile = fopen(if_filename, "w")) != NULL) { fprintf(lockfile, "tun%d\n", tunno); fclose(lockfile); } else LogPrintf(LogALERT, "Warning: Can't create %s: %s\n", if_filename, strerror(errno)); if (server >= 0) LogPrintf(LogPHASE, "Listening at %d.\n", port); VarTerm = 0; /* We know it's currently stdin */ #ifdef DOTTYINIT if (mode & (MODE_DIRECT|MODE_DEDICATED)) { /* } */ #else if (mode & MODE_DIRECT) { #endif chdir("/"); /* Be consistent with daemon() */ TtyInit(); } else daemon(0,0); } else { TtyInit(); TtyCommandMode(1); } LogPrintf(LogPHASE, "PPP Started.\n"); do DoLoop(); while (mode & MODE_DEDICATED); Cleanup(EX_DONE); } /* * Turn into packet mode, where we speak PPP. */ void PacketMode() { if (RawModem(modem) < 0) { LogPrintf(LogWARN, "PacketMode: Not connected.\n"); return; } AsyncInit(); VjInit(); LcpInit(); IpcpInit(); CcpInit(); LcpUp(); LcpOpen(VarOpenMode); if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER) { TtyCommandMode(1); if (VarTerm) { fprintf(VarTerm, "Packet mode.\n"); aft_cmd = 1; } } } static void ShowHelp() { fprintf(stderr, "The following commands are available:\n"); fprintf(stderr, " ~p\tEnter Packet mode\n"); fprintf(stderr, " ~-\tDecrease log level\n"); fprintf(stderr, " ~+\tIncrease log level\n"); fprintf(stderr, " ~t\tShow timers (only in \"log debug\" mode)\n"); fprintf(stderr, " ~m\tShow memory map (only in \"log debug\" mode)\n"); fprintf(stderr, " ~.\tTerminate program\n"); fprintf(stderr, " ~?\tThis help\n"); } static void ReadTty() { int n; char ch; static int ttystate; FILE *oVarTerm; #define MAXLINESIZE 200 char linebuff[MAXLINESIZE]; 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; DecodeCommand(linebuff, n, 1); } else { LogPrintf(LogPHASE, "client connection closed.\n"); VarLocalAuth = LOCAL_NO_AUTH; mode &= ~MODE_INTER; oVarTerm = VarTerm; VarTerm = 0; if (oVarTerm && oVarTerm != stdout) fclose(oVarTerm); close(netfd); netfd = -1; } return; } /* * We are in terminal mode, decode special sequences */ n = read(fileno(VarTerm), &ch, 1); LogPrintf(LogDEBUG, "Got %d bytes (reading from the terminal)", 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(); 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 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, }; u_char * HdlcDetect(cp, n) u_char *cp; int n; { 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((u_char *)ptr); } static struct pppTimer RedialTimer; static void RedialTimeout() { StopTimer(&RedialTimer); LogPrintf(LogPHASE, "Redialing timer expired.\n"); } static void StartRedialTimer(Timeout) 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); } } static void DoLoop() { fd_set rfds, wfds, efds; int pri, i, n, wfd, nfds; struct sockaddr_in hisaddr; struct timeval timeout, *tp; int ssize = sizeof(hisaddr); u_char *cp; u_char rbuff[MAX_MRU]; int dial_up; int tries; int qlen; pid_t pgroup; pgroup = getpgrp(); if (mode & MODE_DIRECT) { LogPrintf(LogDEBUG, "Opening modem\n"); modem = OpenModem(mode); LogPrintf(LogPHASE, "Packet mode enabled\n"); PacketMode(); } else if (mode & MODE_DEDICATED) { if (modem < 0) modem = OpenModem(mode); } fflush(VarTerm); timeout.tv_sec = 0; timeout.tv_usec = 0; reconnectState = RECON_UNKNOWN; if (mode & MODE_BACKGROUND) dial_up = TRUE; /* Bring the line up */ else dial_up = FALSE; /* 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 = TRUE; /* * 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 != TRUE && reconnectState == RECON_TRUE) { if (++reconnectCount <= VarReconnectTries) { LogPrintf(LogPHASE, "Connection lost, re-establish (%d/%d)\n", reconnectCount, VarReconnectTries); StartRedialTimer(VarReconnectTimer); dial_up = TRUE; } else { if (VarReconnectTries) LogPrintf(LogPHASE, "Connection lost, maximum (%d) times\n", VarReconnectTries); reconnectCount = 0; if (mode & MODE_BACKGROUND) Cleanup(EX_DEAD); } reconnectState = RECON_ENVOKED; } } /* * 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); modem = OpenModem(mode); if (modem < 0) { tries++; if (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 (VarDialTries && tries >= VarDialTries) { if (mode & MODE_BACKGROUND) Cleanup(EX_DIAL); /* Can't get the modem */ dial_up = FALSE; reconnectState = RECON_UNKNOWN; reconnectCount = 0; tries = 0; } else StartRedialTimer(VarRedialTimeout); } else { tries++; /* Tries are per number, not per list of numbers. */ if (VarDialTries) LogPrintf(LogCHAT, "Dial attempt %u of %d\n", tries, VarDialTries); else LogPrintf(LogCHAT, "Dial attempt %u\n", tries); if (DialModem() == EX_DONE) { sleep(1); /* little pause to allow peer starts */ ModemTimeout(); PacketMode(); dial_up = FALSE; reconnectState = RECON_UNKNOWN; tries = 0; } else { CloseModem(); if (mode & MODE_BACKGROUND) { if (VarNextPhone == NULL) Cleanup(EX_DIAL); /* Tried all numbers - no luck */ else /* Try all numbers in background mode */ StartRedialTimer(VarRedialNextTimeout); } else if (VarDialTries && tries >= VarDialTries) { /* I give up ! Can't get through :( */ StartRedialTimer(VarRedialTimeout); dial_up = FALSE; 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); } /* *** 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. */ #ifndef SIGALRM 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, "select: %s", 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)) { LogPrintf(LogPHASE, "connected to client.\n"); wfd = accept(server, (struct sockaddr *)&hisaddr, &ssize); if (wfd < 0) { LogPrintf(LogERROR, "accept: %s", strerror(errno)); continue; } if (netfd >= 0) { write(wfd, "already in use.\n", 16); close(wfd); continue; } else netfd = wfd; VarTerm = fdopen(netfd, "a+"); mode |= MODE_INTER; Greetings(); switch ( LocalAuthInit() ) { case NOT_FOUND: if (VarTerm) { fprintf(VarTerm,LAUTH_M1); fprintf(VarTerm,LAUTH_M2); fflush(VarTerm); } /* Fall down */ case VALID: VarLocalAuth = LOCAL_AUTH; break; default: break; } (void) IsInteractive(); Prompt(); } if ((mode & MODE_INTER) && (netfd >= 0 && FD_ISSET(netfd, &rfds)) && ((mode & MODE_AUTO) || pgroup == tcgetpgrp(0))) { /* something to read from tty */ ReadTty(); } if (modem >= 0) { if (FD_ISSET(modem, &wfds)) { /* ready to write into modem */ ModemStartOutput(modem); } if (FD_ISSET(modem, &rfds)) { /* something to read from modem */ if (LcpFsm.state <= ST_CLOSED) 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, rbuff, sizeof(rbuff)); if (n < 0) { LogPrintf(LogERROR, "read from tun: %s", strerror(errno)); 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, FL_DIAL); if (pri >= 0) { if (mode & MODE_ALIAS) { VarPacketAliasOut(rbuff, sizeof rbuff); n = ntohs(((struct ip *)rbuff)->ip_len); } IpEnqueue(pri, rbuff, n); dial_up = TRUE; /* XXX */ } continue; } pri = PacketCheck(rbuff, n, FL_OUT); if (pri >= 0) { if (mode & MODE_ALIAS) { VarPacketAliasOut(rbuff, sizeof rbuff); n = ntohs(((struct ip *)rbuff)->ip_len); } IpEnqueue(pri, rbuff, n); } } } LogPrintf(LogDEBUG, "Job (DoLoop) done.\n"); }