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pptpctrl.c

/*
 * pptpctrl.c
 *
 * PPTP control connection between PAC-PNS pair
 *
 * $Id: pptpctrl.c,v 1.20 2006/12/08 00:01:40 quozl Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef __linux__
#define _GNU_SOURCE 1         /* kill() prototype, broken arpa/inet.h */
#endif

#include "our_syslog.h"

#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_OPENPTY
#ifdef HAVE_PTY_H
#include <pty.h>
#include <termios.h>
#endif
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif
#endif

#ifdef __UCLIBC__
#define socklen_t int
#endif

#include "compat.h"
#include "pptpctrl.h"
#include "pptpgre.h"
#include "pptpdefs.h"
#include "ctrlpacket.h"
#include "defaults.h"
// placing net/if.h here fixes build on Solaris
#include <net/if.h>

static char *ppp_binary = PPP_BINARY;
static int pptp_logwtmp;
static int noipparam;               /* if true, don't send ipparam to ppp */
static char speed[32];
static char pppdxfig[256];
static pid_t pppfork;                   /* so we can kill it after disconnect */

/*
 * Global to handle dying
 *
 * I'd be nice if someone could figure out a way to do it 
 * without the global, but i don't think you can.. -tmk
 */
#define clientSocket 0        /* in case it changes back to a variable */
static u_int32_t call_id_pair;      /* call id (to terminate call) */

/* Needed by this and ctrlpacket.c */
int pptpctrl_debug = 0;       /* specifies if debugging is on or off */
uint16_t unique_call_id = 0xFFFF;   /* Start value for our call IDs on this TCP link */

int gargc;                     /* Command line argument count */
char **gargv;                  /* Command line argument vector */

/* Local function prototypes */
static void bail(int sigraised);
static void pptp_handle_ctrl_connection(char **pppaddrs, struct in_addr *inetaddrs);

static int startCall(char **pppaddrs, struct in_addr *inetaddrs);
static void launch_pppd(char **pppaddrs, struct in_addr *inetaddrs);

/* Oh the horror.. lets hope this covers all the ones we have to handle */
#if defined(O_NONBLOCK) && !defined(__sun__) && !defined(__sun)
#define OUR_NB_MODE O_NONBLOCK
#else
#define OUR_NB_MODE O_NDELAY
#endif

/* read a command line argument, a flag alone */
#define GETARG_INT(X) \
      X = atoi(argv[arg++])

/* read a command line argument, a string alone */
#define GETARG_STRING(X) \
      X = strdup(argv[arg++])

/* read a command line argument, a presence flag followed by string */
#define GETARG_VALUE(X) \
      if(atoi(argv[arg++]) != 0) \
            strlcpy(X, argv[arg++], sizeof(X)); \
      else \
            *X = '\0'

int main(int argc, char **argv)
{
      char pppLocal[16];            /* local IP to pass to pppd */
      char pppRemote[16];           /* remote IP address to pass to pppd */
      struct sockaddr_in addr;      /* client address */
      socklen_t addrlen;
      int arg = 1;
      int flags;
      struct in_addr inetaddrs[2];
      char *pppaddrs[2] = { pppLocal, pppRemote };

        gargc = argc;
        gargv = argv;

      /* fail if argument count invalid */
      if (argc < 7) {
            fprintf(stderr, "pptpctrl: insufficient arguments, see man pptpctrl\n");
            exit(2);
      }

      /* open a connection to the syslog daemon */
      openlog("pptpd", LOG_PID, PPTP_FACILITY);

      /* autoreap if supported */
      signal(SIGCHLD, SIG_IGN);

      /* note: update pptpctrl.8 if the argument list format is changed */
      GETARG_INT(pptpctrl_debug);
      GETARG_INT(noipparam);
      GETARG_VALUE(pppdxfig);
      GETARG_VALUE(speed);
      GETARG_VALUE(pppLocal);
      GETARG_VALUE(pppRemote);
      if (arg < argc) GETARG_INT(unique_call_id);
      if (arg < argc) GETARG_STRING(ppp_binary);
      if (arg < argc) GETARG_INT(pptp_logwtmp);
      
      if (pptpctrl_debug) {
            if (*pppLocal)
                  syslog(LOG_DEBUG, "CTRL: local address = %s", pppLocal);
            if (*pppRemote)
                  syslog(LOG_DEBUG, "CTRL: remote address = %s", pppRemote);
            if (*speed)
                  syslog(LOG_DEBUG, "CTRL: pppd speed = %s", speed);
            if (*pppdxfig)
                  syslog(LOG_DEBUG, "CTRL: pppd options file = %s", pppdxfig);
      }

      addrlen = sizeof(addr);
      if (getsockname(clientSocket, (struct sockaddr *) &addr, &addrlen) != 0) {
            syslog(LOG_ERR, "CTRL: getsockname() failed");
            syslog_perror("getsockname");
            close(clientSocket);
            bail(0);    /* NORETURN */
      }
      inetaddrs[0] = addr.sin_addr;

      addrlen = sizeof(addr);
      if (getpeername(clientSocket, (struct sockaddr *) &addr, &addrlen) != 0) {
            syslog(LOG_ERR, "CTRL: getpeername() failed");
            syslog_perror("getpeername");
            close(clientSocket);
            bail(0);    /* NORETURN */
      }
      inetaddrs[1] = addr.sin_addr;

      /* Set non-blocking */
      if ((flags = fcntl(clientSocket, F_GETFL, arg /* ignored */)) == -1 ||
          fcntl(clientSocket, F_SETFL, flags|OUR_NB_MODE) == -1) {
            syslog(LOG_ERR, "CTRL: Failed to set client socket non-blocking");
            syslog_perror("fcntl");
            close(clientSocket);
            bail(0);    /* NORETURN */
      }

      
      /* Fiddle with argv */
        my_setproctitle(gargc, gargv, "pptpd [%s]%20c",
            inet_ntoa(addr.sin_addr), ' ');

      /* be ready for a grisly death */
      sigpipe_create();
      sigpipe_assign(SIGTERM);
      NOTE_VALUE(PAC, call_id_pair, htons(-1));
      NOTE_VALUE(PNS, call_id_pair, htons(-1));

      syslog(LOG_INFO, "CTRL: Client %s control connection started", inet_ntoa(addr.sin_addr));
      pptp_handle_ctrl_connection(pppaddrs, inetaddrs);
      syslog(LOG_DEBUG, "CTRL: Reaping child PPP[%i]", pppfork);
      if (pppfork > 0)
            waitpid(pppfork, NULL, 0);
      syslog(LOG_INFO, "CTRL: Client %s control connection finished", inet_ntoa(addr.sin_addr));

      bail(0);          /* NORETURN */
      return 1;         /* make gcc happy */
}


/*
 * Local functions only below
 */

/*
 * pptp_handle_ctrl_connection
 *
 * 1. read a packet (should be start_ctrl_conn_rqst)
 * 2. reply to packet (send a start_ctrl_conn_rply)
 * 3. proceed with GRE and CTRL connections
 *
 * args: pppaddrs - ppp local and remote addresses (strings)
 *       inetaddrs - local and client socket address
 * retn: 0 success, -1 failure
 */
static void pptp_handle_ctrl_connection(char **pppaddrs, struct in_addr *inetaddrs)
{

      /* For echo requests used to check link is alive */
      int echo_wait = FALSE;        /* Waiting for echo? */
      u_int32_t echo_count = 0;     /* Sequence # of echo */
      time_t echo_time = 0;         /* Time last echo req sent */
      struct timeval idleTime;      /* How long to select() */

      /* General local variables */
      ssize_t rply_size;            /* Reply packet size */
      fd_set fds;             /* For select() */
      int maxfd = clientSocket;     /* For select() */
      int send_packet;        /* Send a packet this time? */
#if BSDUSER_PPP || SLIRP
/* not needed by stuff which uses socketpair() in startCall() */
#define init 1
#else
      int init = 0;                 /* Has pppd initialized the pty? */
#endif
      int pty_fd = -1;        /* File descriptor of pty */
      int gre_fd = -1;        /* Network file descriptor */
      int sig_fd = sigpipe_fd();    /* Signal pipe descriptor     */

      unsigned char packet[PPTP_MAX_CTRL_PCKT_SIZE];
      unsigned char rply_packet[PPTP_MAX_CTRL_PCKT_SIZE];

      for (;;) {

            FD_ZERO(&fds);
            FD_SET(sig_fd, &fds);
            FD_SET(clientSocket, &fds);
            if (pty_fd != -1)
                  FD_SET(pty_fd, &fds);
            if (gre_fd != -1 && init)
                  FD_SET(gre_fd, &fds);

            /* set timeout */
            if (encaps_gre(-1, NULL, 0) || decaps_hdlc(-1, NULL, 0)) {
                  idleTime.tv_sec = 0;
                  idleTime.tv_usec = 50000; /* don't ack immediately */
            } else {
                  idleTime.tv_sec = IDLE_WAIT;
                  idleTime.tv_usec = 0;
            }

            /* default: do nothing */
            send_packet = FALSE;

            switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
            case -1:    /* Error with select() */
                  if (errno != EINTR)
                        syslog(LOG_ERR, "CTRL: Error with select(), quitting");
                  goto leave_clear_call;

            case 0:
                  if (decaps_hdlc(-1, NULL, 0)) {
                        if(decaps_hdlc(-1, encaps_gre, gre_fd))
                              syslog(LOG_ERR, "CTRL: GRE re-xmit failed");
                  } else if (encaps_gre(-1, NULL, 0))
                        /* Pending ack and nothing else to do */
                        encaps_gre(gre_fd, NULL, 0);  /* send ack with no payload */
                  else if (echo_wait != TRUE) {
                        /* Timeout. Start idle link detection. */
                        echo_count++;
                        if (pptpctrl_debug)
                              syslog(LOG_DEBUG, "CTRL: Sending ECHO REQ id %d", echo_count);
                        time(&echo_time);
                        make_echo_req_packet(rply_packet, &rply_size, echo_count);
                        echo_wait = TRUE;
                        send_packet = TRUE;
                  }
                  break;

            default:
                  break;
            }

            /* check for pending SIGTERM delivery */
            if (FD_ISSET(sig_fd, &fds)) {
                  if (sigpipe_read() == SIGTERM)
                        bail(SIGTERM);
            }

            /* detect startup of pppd */
#ifndef init
            if (!init && pty_fd != -1 && FD_ISSET(pty_fd, &fds))
                  init = 1;
#endif

            /* handle actual packets */

            /* send from pty off via GRE */
            if (pty_fd != -1 && FD_ISSET(pty_fd, &fds) && decaps_hdlc(pty_fd, encaps_gre, gre_fd) < 0) {
                  syslog(LOG_ERR, "CTRL: PTY read or GRE write failed (pty,gre)=(%d,%d)", pty_fd, gre_fd);
                  break;
            }
            /* send from GRE off to pty */
            if (gre_fd != -1 && FD_ISSET(gre_fd, &fds) && decaps_gre(gre_fd, encaps_hdlc, pty_fd) < 0) {
                  if (gre_fd == 6 && pty_fd == 5) {
                        syslog(LOG_ERR, "CTRL: GRE-tunnel has collapsed (GRE read or PTY write failed (gre,pty)=(%d,%d))", gre_fd, pty_fd);
                  } else {
                        syslog(LOG_ERR, "CTRL: GRE read or PTY write failed (gre,pty)=(%d,%d)", gre_fd, pty_fd);
                  }
                  break;
            }
            /* handle control messages */

            if (FD_ISSET(clientSocket, &fds)) {
                  send_packet = TRUE;
                  switch (read_pptp_packet(clientSocket, packet, rply_packet, &rply_size)) {
                  case 0:
                        syslog(LOG_ERR, "CTRL: CTRL read failed");
                        goto leave_drop_call;

                  case -1:
                        send_packet = FALSE;
                        break;

                  case STOP_CTRL_CONN_RQST:
                        if (pptpctrl_debug)
                              syslog(LOG_DEBUG, "CTRL: Received STOP CTRL CONN request (disconnecting)");
                        if (gre_fd != -1 || pty_fd != -1)
                              syslog(LOG_WARNING, "CTRL: Request to close control connection when call is open, closing");
                        send_pptp_packet(clientSocket, rply_packet, rply_size);
                        goto leave_drop_call;

                  case CALL_CLR_RQST:
                        if(pptpctrl_debug)
                              syslog(LOG_DEBUG, "CTRL: Received CALL CLR request (closing call)");
                        if (gre_fd == -1 || pty_fd == -1)
                              syslog(LOG_WARNING, "CTRL: Request to close call but call not open");
                        if (gre_fd != -1) {
                              FD_CLR(gre_fd, &fds);
                              close(gre_fd);
                              gre_fd = -1;
                        }
                        if (pty_fd != -1) {
                              FD_CLR(pty_fd, &fds);
                              close(pty_fd);
                              pty_fd = -1;
                        }
                        /* violating RFC */
                                goto leave_drop_call;

                  case OUT_CALL_RQST:
                        /* for killing off the link later (ugly) */
                        NOTE_VALUE(PAC, call_id_pair, ((struct pptp_out_call_rply *) (rply_packet))->call_id);
                        NOTE_VALUE(PNS, call_id_pair, ((struct pptp_out_call_rply *) (rply_packet))->call_id_peer);
                        if (gre_fd != -1 || pty_fd != -1) {
                              syslog(LOG_WARNING, "CTRL: Request to open call when call is already open, closing");
                              if (gre_fd != -1) {
                                    FD_CLR(gre_fd, &fds);
                                    close(gre_fd);
                                    gre_fd = -1;
                              }
                              if (pty_fd != -1) {
                                    FD_CLR(pty_fd, &fds);
                                    close(pty_fd);
                                    pty_fd = -1;
                              }
                        }
                                /* change process title for accounting and status scripts */
                                my_setproctitle(gargc, gargv,
                                      "pptpd [%s:%04X - %04X]",
                                      inet_ntoa(inetaddrs[1]),
                                      ntohs(((struct pptp_out_call_rply *) (rply_packet))->call_id_peer),
                                      ntohs(((struct pptp_out_call_rply *) (rply_packet))->call_id));
                        /* start the call, by launching pppd */
                        syslog(LOG_INFO, "CTRL: Starting call (launching pppd, opening GRE)");
                        pty_fd = startCall(pppaddrs, inetaddrs);
                        if (pty_fd > maxfd) maxfd = pty_fd;
                        if ((gre_fd = pptp_gre_init(call_id_pair, pty_fd, inetaddrs)) > maxfd)
                              maxfd = gre_fd;
                        break;

                  case ECHO_RPLY:
                        if (echo_wait == TRUE && ((struct pptp_echo_rply *) (packet))->identifier == echo_count)
                              echo_wait = FALSE;
                        else
                              syslog(LOG_WARNING, "CTRL: Unexpected ECHO REPLY packet");
                        /* FALLTHRU */
                  case SET_LINK_INFO:
                        send_packet = FALSE;
                        break;

#ifdef PNS_MODE
                  case IN_CALL_RQST:
                  case IN_CALL_RPLY:
                  case IN_CALL_CONN:
#endif

                  case CALL_DISCONN_NTFY:
                  case STOP_CTRL_CONN_RPLY:
                        /* These don't generate replies.  Also they come from things we don't send in this section. */
                        syslog(LOG_WARNING, "CTRL: Got a reply to a packet we didn't send");
                        send_packet = FALSE;
                        break;

                  /* Otherwise, the already-formed reply will do fine, so send it */
                  }
            }

            /* send reply packet - this may block, but it should be very rare */
            if (send_packet == TRUE && send_pptp_packet(clientSocket, rply_packet, rply_size) < 0) {
                  syslog(LOG_ERR, "CTRL: Error sending GRE, aborting call");
                  goto leave_clear_call;
            }

            /* waiting for echo reply and curtime - echo_time > max wait */
            if (echo_wait == TRUE && (time(NULL) - echo_time) > MAX_ECHO_WAIT) {
                  syslog(LOG_INFO, "CTRL: Session timed out, ending call");
                  goto leave_clear_call;
            }
      }
      /* Finished! :-) */
leave_drop_call:
      NOTE_VALUE(PAC, call_id_pair, htons(-1));
      NOTE_VALUE(PNS, call_id_pair, htons(-1));
      close(clientSocket);
leave_clear_call:
      /* leave clientSocket and call_id_pair alone for bail() */
      if (gre_fd != -1)
            close(gre_fd);
      gre_fd = -1;
      if (pty_fd != -1)
            close(pty_fd);
      pty_fd = -1;
      return;
#ifdef init
#undef init
#endif
}


/*
 * This is the custom exit() for this program.
 *
 * Updated to also be the default SIGTERM handler, and if
 * the link is going down for unnatural reasons, we will close it
 * right now, it's only been tested for win98, other tests would be nice
 * -tmk
 */
static void bail(int sigraised)
{
      if (sigraised)
            syslog(LOG_INFO, "CTRL: Exiting on signal %d", sigraised);

      /* send a disconnect to the other end */
      /* ignore any errors */
      if (GET_VALUE(PAC, call_id_pair) != htons(-1)) {
            fd_set connSet;         /* fd_set for select() */
            struct timeval tv;      /* time to wait for reply */
            unsigned char packet[PPTP_MAX_CTRL_PCKT_SIZE];
            unsigned char rply_packet[PPTP_MAX_CTRL_PCKT_SIZE];
            ssize_t rply_size;      /* reply packet size */
            int pkt;
            int retry = 0;

            if (pptpctrl_debug)
                  syslog(LOG_DEBUG, "CTRL: Exiting with active call");

            make_call_admin_shutdown(rply_packet, &rply_size);
            if(send_pptp_packet(clientSocket, rply_packet, rply_size) < 0)
                  goto skip;

            make_stop_ctrl_req(rply_packet, &rply_size);
            if(send_pptp_packet(clientSocket, rply_packet, rply_size) < 0)
                  goto skip;

            FD_ZERO(&connSet);
            FD_SET(clientSocket, &connSet);
            tv.tv_sec = 5;    /* wait 5 secs for a reply then quit */
            tv.tv_usec = 0;

            /* Wait for STOP CTRL CONN RQST or RPLY */
            while (select(clientSocket + 1, &connSet, NULL, NULL, &tv) == 1) {
                  switch((pkt = read_pptp_packet(clientSocket, packet, rply_packet, &rply_size))) {
                  case STOP_CTRL_CONN_RQST:
                        send_pptp_packet(clientSocket, rply_packet, rply_size);
                        goto skip;
                  case CALL_CLR_RQST:
                        syslog(LOG_WARNING, "CTRL: Got call clear request after call manually shutdown - buggy client");
                        break;
                  case STOP_CTRL_CONN_RPLY:
                        goto skip;
                  case -1:
                        syslog(LOG_WARNING, "CTRL: Retryable error in disconnect sequence");
                        retry++;
                        break;
                  case 0:
                        syslog(LOG_WARNING, "CTRL: Fatal error reading control message in disconnect sequence");
                        goto skip;
                  default:
                        syslog(LOG_WARNING, "CTRL: Unexpected control message %d in disconnect sequence", pkt);
                        retry++;
                        break;
                  }
                  tv.tv_sec = 5;    /* wait 5 secs for another reply then quit */
                  tv.tv_usec = 0;
                  if (retry > 100) {
                        syslog(LOG_WARNING, "CTRL: Too many retries (%d) - giving up", retry);
                        break;
                  }
            }

      skip:
            close(clientSocket);
      }

      if (pptpctrl_debug)
            syslog(LOG_DEBUG, "CTRL: Exiting now");
}

/*
 * startCall
 *
 * Launches PPPD for the call.
 *
 * args:        pppaddrs - local/remote IPs or "" for either/both if none
 * retn:        pty file descriptor
 *
 */
static int startCall(char **pppaddrs, struct in_addr *inetaddrs)
{
      /* PTY/TTY pair for talking to PPPd */
      int pty_fd, tty_fd;
      /* register pids of children */
#if BSDUSER_PPP || SLIRP
      int sockfd[2];

#ifndef AF_LOCAL
#ifdef AF_UNIX
#define AF_LOCAL AF_UNIX /* Old BSD */
#else
#define AF_LOCAL AF_FILE /* POSIX */
#endif
#endif

      /* userspace ppp doesn't need to waste a real pty/tty pair */
      if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sockfd)) {
            syslog(LOG_ERR, "CTRL: socketpair() error");
            syslog_perror("socketpair");
            exit(1);
      }
      tty_fd = sockfd[0];
      pty_fd = sockfd[1];
#else
      /* Finds an open pty/tty pair */
      if (openpty(&pty_fd, &tty_fd, NULL, NULL, NULL) != 0) {
            syslog(LOG_ERR, "CTRL: openpty() error");
            syslog_perror("openpty");
            exit(1);
      } else {
            struct termios tios;

            /* Turn off echo in the slave - to prevent loopback.
               pppd will do this, but might not do it before we
               try to send data. */
            if (tcgetattr(tty_fd, &tios) < 0) {
                  syslog(LOG_ERR, "CTRL: tcgetattr() error");
                  syslog_perror("tcgetattr");
                  exit(1);
            }
            tios.c_lflag &= ~(ECHO | ECHONL);
            if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0) {
                  syslog(LOG_ERR, "CTRL: tcsetattr() error");
                  syslog_perror("tcsetattr");
                  exit(1);
            }
      }
#endif
      if (pptpctrl_debug) {
            syslog(LOG_DEBUG, "CTRL: pty_fd = %d", pty_fd);
            syslog(LOG_DEBUG, "CTRL: tty_fd = %d", tty_fd);
      }
      /* Launch the PPPD  */
#ifndef HAVE_FORK
        switch(pppfork=vfork()){
#else
        switch(pppfork=fork()){
#endif
      case -1:    /* fork() error */
            syslog(LOG_ERR, "CTRL: Error forking to exec pppd");
            _exit(1);

      case 0:           /* child */
            if (dup2(tty_fd, 0) == -1) {
              syslog(LOG_ERR, "CTRL: child tty_fd dup2 to stdin, %s",
                   strerror(errno));
              exit(1);
            }
            if (dup2(tty_fd, 1) == -1) {
              syslog(LOG_ERR, "CTRL: child tty_fd dup2 to stdout, %s",
                   strerror(errno));
              exit(1);
            }
#if 0
            /* This must never be used if !HAVE_SYSLOG since that logs to stderr.
             * Trying just never using it to see if it causes anyone else problems.
             * It may let people see the pppd errors, which would be good.
             */
            dup2(tty_fd, 2);
#endif
            if (tty_fd > 1)
                  close(tty_fd);
            if (pty_fd > 1)
                  close(pty_fd);
/* In case we move clientSocket back off stdin */
#ifndef clientSocket
            if (clientSocket > 1)
                  close(clientSocket);
#elif clientSocket > 1
            close(clientSocket);
#endif
            launch_pppd(pppaddrs, inetaddrs);
            syslog(LOG_ERR, "CTRL: PPPD launch failed! (launch_pppd did not fork)");
            _exit(1);
      }
      
      close(tty_fd);
      return pty_fd;
}

/*
 * launch_pppd
 *
 * Launches the PPP daemon. The PPP daemon is responsible for assigning the
 * PPTP client its IP address.. These values are assigned via the command
 * line.
 *
 * Add return of connected ppp interface
 *
 * retn: 0 on success, -1 on failure.
 *
 */
static void launch_pppd(char **pppaddrs, struct in_addr *inetaddrs)
{
      char *pppd_argv[14];
      int an = 0;
      sigset_t sigs;

      pppd_argv[an++] = ppp_binary;

      if (pptpctrl_debug) {
            syslog(LOG_DEBUG, 
                   "CTRL (PPPD Launcher): program binary = %s", 
                   pppd_argv[an - 1]);
      }

#if BSDUSER_PPP

      /* The way that Brian Somers' user-land ppp works is to use the
       * system name as a reference for most of the useful options. Hence
       * most things can't be defined on the command line. On OpenBSD at
       * least the file used for the systems is /etc/ppp/ppp.conf, where
       * the pptp stanza should look something like:

       pptp:
       set speed sync
       enable pap
       enable chap
       set dns a.a.a.a b.b.b.b
       set ndbs x.x.x.x y.y.y.y
       accept dns
       add 10.0.0/24

       * To be honest, at the time of writing, I haven't had the thing
       * working enough to understand :) I will update this comment and
       * make a sample config available when I get there.
       */

      /* options for BSDUSER_PPP
       *
       * ignores IP addresses, config file option, speed
       * fix usage info in pptpd.c and configure script if this changes
       *
       * IP addresses can be specified in /etc/ppp/ppp.secret per user
       */
      pppd_argv[an++] = "-direct";
      pppd_argv[an++] = "pptp";     /* XXX this is the system name */
      /* should be dynamic - PMG */

#elif SLIRP

      /* options for SLIRP
       *
       * ignores IP addresses from config - SLIRP handles this
       */
      pppd_argv[an++] = "-P";
      pppd_argv[an++] = "+chap";
      pppd_argv[an++] = "-b";

      /* If a speed has been specified, use it
       * if not, use "smart" default (defaults.h)
       */
      if (*speed) {
            pppd_argv[an++] = speed;
      } else {
            pppd_argv[an++] = PPP_SPEED_DEFAULT;
      }

      if (*pppdxfig) {
            pppd_argv[an++] = "-f";
            pppd_argv[an++] = pppdxfig;
      }

      if (pptpctrl_debug) {
            syslog(LOG_DEBUG, "CTRL (PPPD Launcher): Connection speed = %s", pppd_argv[an - 1]);
      }
#else

      /* options for 'normal' pppd */

      pppd_argv[an++] = "local";

      /* If a pppd option file is specified, use it
       * if not, pppd will default to /etc/ppp/options
       */
      if (*pppdxfig) {
            pppd_argv[an++] = "file";
            pppd_argv[an++] = pppdxfig;
      }
      
      /* If a speed has been specified, use it
       * if not, use "smart" default (defaults.h)
       */
      if (*speed) {
            pppd_argv[an++] = speed;
      } else {
            pppd_argv[an++] = PPP_SPEED_DEFAULT;
      }

      if (pptpctrl_debug) {
            if (*pppaddrs[0])
                  syslog(LOG_DEBUG, "CTRL (PPPD Launcher): local address = %s", pppaddrs[0]);
            if (*pppaddrs[1])
                  syslog(LOG_DEBUG, "CTRL (PPPD Launcher): remote address = %s", pppaddrs[1]);
      }
      
      if (*pppaddrs[0] || *pppaddrs[1]) {
            char pppInterfaceIPs[33];
            sprintf(pppInterfaceIPs, "%s:%s", pppaddrs[0], pppaddrs[1]);
            pppd_argv[an++] = pppInterfaceIPs;
      }
#endif

        if (!noipparam) {
                 pppd_argv[an++] = "ipparam";
                 pppd_argv[an++] = inet_ntoa(inetaddrs[1]);
        }

        if (pptp_logwtmp) {
                 pppd_argv[an++] = "plugin";
                 pppd_argv[an++] = "/usr/lib/pptpd/pptpd-logwtmp.so";
                 pppd_argv[an++] = "pptpd-original-ip";
                 pppd_argv[an++] = inet_ntoa(inetaddrs[1]);
        }

      /* argv arrays must always be NULL terminated */
      pppd_argv[an++] = NULL;
      /* make sure SIGCHLD is unblocked, pppd does not expect it */
      sigfillset(&sigs);
      sigprocmask(SIG_UNBLOCK, &sigs, NULL);
      /* run pppd now */
      execvp(pppd_argv[0], pppd_argv);
      /* execvp() failed */
      syslog(LOG_ERR, 
             "CTRL (PPPD Launcher): Failed to launch PPP daemon. %s",
             strerror(errno));
}


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