source: freewrt/package/l2tpd/patches/03-jacco-pty.patch@ 428f140

l2tpd.c

@@ -16 +16 @@
  */
 
 #include <stdlib.h>
+#include <sys/types.h>
 #include <sys/utsname.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
@@ -274 +275 @@
 
 int start_pppd (struct call *c, struct ppp_opts *opts)
 {
-    char a, b;
-    char tty[80];
+    /* char a, b; */
+    char *tty;
     char *stropt[80];
     struct ppp_opts *p;
 #ifdef USE_KERNEL
@@ -324 +325 @@
     else
     {
 #endif
-        if ((c->fd = getPtyMaster (&a, &b)) < 0)
+        c->fd = open("/dev/ptmx", O_RDWR);
+        if (c->fd == -1)
+        {
+                log (LOG_WARN, "%s: unable to open /dev/ptmx to allocate pty\n",
+                                __FUNCTION__);
+                return -EINVAL;
+        } else
+        {
+            if (grantpt(c->fd))
+            {
+                log (LOG_WARN, "%s: unable to grantpt() on pty\n",
+                                __FUNCTION__);
+                close(c->fd);
+                return -EINVAL;
+            }
+            if (unlockpt(c->fd))
+            {
+                log (LOG_WARN, "%s: unable to unlockpt() on pty\n",
+                        __FUNCTION__);
+                close(c->fd);
+                return -EINVAL;
+            }
+            tty = ptsname(c->fd);
+            if (tty == NULL)
+            {
+                log (LOG_WARN, "%s: unable to obtain name of slave tty\n",
+                        __FUNCTION__);
+                close(c->fd);
+                return -EINVAL;
+            }
+        }
+        
+        
+ /*     if ((c->fd = getPtyMaster (&a, &b)) < 0)
         {
             log (LOG_WARN, "%s: unable to allocate pty, abandoning!\n",
                  __FUNCTION__);
             return -EINVAL;
-        }
+        } */
 
         /* set fd opened above to not echo so we don't see read our own packets
            back of the file descriptor that we just wrote them to */
@@ -338 +372 @@
         ptyconf.c_cflag &= ~(ICANON | ECHO);
         tcsetattr (c->fd, TCSANOW, &ptyconf);
 
-        snprintf (tty, sizeof (tty), "/dev/tty%c%c", a, b);
+/*        snprintf (tty, sizeof (tty), "/dev/tty%c%c", a, b); */
         fd2 = open (tty, O_RDWR);
+        if (fd2 == -1)
+        {
+                log (LOG_WARN, "%s: unable to open slave tty %s\n", __FUNCTION__, tty);
+                close(c->fd);
+                return -EINVAL;
+        }
 
 #ifdef USE_KERNEL
     }

l2tpd.c.orig

@@ +1 @@
+/*
+ * $Id$
+ *
+ * Layer Two Tunnelling Protocol Daemon
+ * Copyright (C) 1998 Adtran, Inc.
+ * Copyright (C) 2002 Jeff McAdams
+ *
+ * Mark Spencer
+ *
+ * This software is distributed under the terms
+ * of the GPL, which you should have received
+ * along with this source.
+ *
+ * Main Daemon source.
+ *
+ */
+
+#include <stdlib.h>
+#include <sys/utsname.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <time.h>
+#if (__GLIBC__ < 2)
+# if defined(FREEBSD)
+#  include <sys/signal.h>
+# elif defined(LINUX)
+#  include <bsd/signal.h>
+# elif defined(SOLARIS)
+#  include <signal.h>
+# endif
+#else
+# include <signal.h>
+#endif
+#include <netdb.h>
+#include <string.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#ifdef USE_KERNEL
+#include <sys/ioctl.h>
+#endif
+#include "l2tp.h"
+
+struct tunnel_list tunnels;
+int max_tunnels = DEF_MAX_TUNNELS;
+struct utsname uts;
+int ppd = 1;                    /* Packet processing delay */
+int control_fd;                 /* descriptor of control area */
+char *args;
+
+char *dial_no_tmp;              /* jz: Dialnumber for Outgoing Call */
+int switch_io = 0;              /* jz: Switch for Incoming or Outgoing Call */
+
+void init_tunnel_list (struct tunnel_list *t)
+{
+    t->head = NULL;
+    t->count = 0;
+    t->calls = 0;
+}
+
+/* Now sends to syslog instead - MvO */
+void show_status (void)
+{
+    struct schedule_entry *se;
+    struct tunnel *t;
+    struct call *c;
+    struct lns *tlns;
+    struct lac *tlac;
+    struct host *h;
+    int s = 0;
+    log (LOG_WARN, "====== l2tpd statistics ========\n");
+    log (LOG_WARN, " Scheduler entries:\n");
+    se = events;
+    while (se)
+    {
+        s++;
+        t = (struct tunnel *) se->data;
+        tlac = (struct lac *) se->data;
+        c = (struct call *) se->data;
+        if (se->func == &hello)
+        {
+            log (LOG_WARN, "%d: HELLO to %d\n", s, t->tid);
+        }
+        else if (se->func == &magic_lac_dial)
+        {
+            log (LOG_WARN, "%d: Magic dial on %s\n", s, tlac->entname);
+        }
+        else if (se->func == &send_zlb)
+        {
+            log (LOG_WARN, "%d: Send payload ZLB on call %d:%d\n", s,
+                     c->container->tid, c->cid);
+        }
+        else if (se->func == &dethrottle)
+        {
+            log (LOG_WARN, "%d: Dethrottle call %d:%d\n", s, c->container->tid,
+                     c->cid);
+        }
+        else
+            log (LOG_WARN, "%d: Unknown event\n", s);
+        se = se->next;
+    };
+    log (LOG_WARN, "Total Events scheduled: %d\n", s);
+    log (LOG_WARN, "Number of tunnels open: %d\n", tunnels.count);
+    t = tunnels.head;
+    while (t)
+    {
+        log (LOG_WARN, "Tunnel %s, ID = %d (local), %d (remote) to %s:%d\n"
+                 "   control_seq_num = %d, control_rec_seq_num = %d,\n"
+                 "   cLr = %d\n",
+                 (t->lac ? t->lac->entname : (t->lns ? t->lns->entname : "")),
+                 t->ourtid, t->tid, IPADDY (t->peer.sin_addr),
+                 ntohs (t->peer.sin_port), t->control_seq_num,
+                 t->control_rec_seq_num, t->cLr);
+        c = t->call_head;
+        while (c)
+        {
+            log (LOG_WARN, 
+                     "Call %s, ID = %d (local), %d (remote), serno = %u,\n"
+                     "      data_seq_num = %d, data_rec_seq_num = %d,\n"
+                     "      pLr = %d, tx = %u bytes (%u), rx= %u bytes (%u)\n",
+                     (c->lac ? c->lac->
+                      entname : (c->lns ? c->lns->entname : "")), c->ourcid,
+                     c->cid, c->serno, c->data_seq_num, c->data_rec_seq_num,
+                     c->pLr, c->tx_bytes, c->tx_pkts, c->rx_bytes, c->rx_pkts);
+            c = c->next;
+        }
+        t = t->next;
+    }
+    log (LOG_WARN, "==========Config File===========\n");
+    tlns = lnslist;
+    while (tlns)
+    {
+        log (LOG_WARN, "LNS entry %s\n",
+                 tlns->entname[0] ? tlns->entname : "(unnamed)");
+        tlns = tlns->next;
+    };
+    tlac = laclist;
+    while (tlac)
+    {
+        log (LOG_WARN, "LAC entry %s, LNS is/are:",
+                 tlac->entname[0] ? tlac->entname : "(unnamed)");
+        h = tlac->lns;
+        if (h)
+        {
+            while (h)
+            {
+                log (LOG_WARN, " %s", h->hostname);
+                h = h->next;
+            }
+        }
+        else
+            log (LOG_WARN, " [none]");
+        log (LOG_WARN, "\n");
+        tlac = tlac->next;
+    };
+    log (LOG_WARN, "================================\n");
+}
+
+void null_handler(int sig)
+{
+       /* FIXME 
+        * A sighup is received when a call is terminated, unknown origine .. 
+        * I catch it and ll looks good, but .. 
+        */
+}
+
+void status_handler (int sig)
+{
+    show_status ();
+}
+
+void child_handler (int signal)
+{
+    /*
+     * Oops, somebody we launched was killed.
+     * It's time to reap them and close that call.
+     * But first, we have to find out what PID died.
+     * unfortunately, pppd will 
+     */
+    struct tunnel *t;
+    struct call *c;
+    pid_t pid;
+    int status;
+    t = tunnels.head;
+    /* Keep looping until all are cleared */
+    for(;;)
+    {
+        pid = waitpid (-1, &status, WNOHANG);
+        if (pid < 1)
+        {
+            /*
+             * Oh well, nobody there.  Maybe we reaped it
+             * somewhere else already
+             */
+            return;
+        }
+        while (t)
+        {
+            c = t->call_head;
+            while (c)
+            {
+                if (c->pppd == pid)
+                {
+                    if ( WIFEXITED( status ) )
+                    {
+                        log (LOG_DEBUG, "%s : pppd exited for call %d with code %d\n", __FUNCTION__,
+                         c->cid, WEXITSTATUS( status ) );
+                    }
+                    else if( WIFSIGNALED( status ) )
+                    {
+                        log (LOG_DEBUG, "%s : pppd terminated for call %d by signal %d\n", __FUNCTION__,
+                         c->cid, WTERMSIG( status ) );
+                    }
+                    else
+                    {
+                        log (LOG_DEBUG, "%s : pppd exited for call %d for unknown reason\n", __FUNCTION__,
+                         c->cid );
+                    }
+                    c->needclose = -1;
+                    /* 
+                     * OK...pppd died, we can go ahead and close the pty for
+                     * it
+                     */
+                    close (c->fd);
+                    c->fd = -1;
+                    return;
+                }
+                c = c->next;
+            }
+            t = t->next;
+        }
+    }
+}
+
+void death_handler (int signal)
+{
+    /*
+       * If we get here, somebody terminated us with a kill or a control-c.
+       * we call call_close on each tunnel twice to get a StopCCN out
+       * for each one (we can't pause to make sure it's received.
+       * Then we close the connections
+     */
+    struct tunnel *st, *st2;
+    int sec;
+    log (LOG_CRIT, "%s: Fatal signal %d received\n", __FUNCTION__, signal);
+    st = tunnels.head;
+    while (st)
+    {
+        st2 = st->next;
+        strcpy (st->self->errormsg, "Server closing");
+        sec = st->self->closing;
+        if (st->lac)
+            st->lac->redial = 0;
+        call_close (st->self);
+        if (!sec)
+        {
+            st->self->closing = -1;
+            call_close (st->self);
+        }
+        st = st2;
+    }
+
+    /* erase pid file */
+        unlink (gconfig.pidfile);
+
+        /* erase control pipe */
+        unlink(CONTROL_PIPE);
+
+    exit (1);
+}
+
+int start_pppd (struct call *c, struct ppp_opts *opts)
+{
+    char a, b;
+    char tty[80];
+    char *stropt[80];
+    struct ppp_opts *p;
+#ifdef USE_KERNEL
+    struct l2tp_call_opts co;
+#endif
+    int pos = 1;
+    int fd2;
+#ifdef DEBUG_PPPD
+    int x;
+#endif
+    struct termios ptyconf;
+    char *str;
+    p = opts;
+    stropt[0] = strdup (PPPD);
+    while (p)
+    {
+        stropt[pos] = (char *) malloc (strlen (p->option) + 1);
+        strncpy (stropt[pos], p->option, strlen (p->option) + 1);
+        pos++;
+        p = p->next;
+    }
+    stropt[pos] = NULL;
+    if (c->pppd > 0)
+    {
+        log (LOG_WARN, "%s: PPP already started on call!\n", __FUNCTION__);
+        return -EINVAL;
+    }
+    if (c->fd > -1)
+    {
+        log (LOG_WARN, "%s: file descriptor already assigned!\n",
+             __FUNCTION__);
+        return -EINVAL;
+    }
+#ifdef USE_KERNEL
+    if (kernel_support)
+    {
+        co.ourtid = c->container->ourtid;
+        co.ourcid = c->ourcid;
+        ioctl (server_socket, L2TPIOCGETCALLOPTS, &co);
+        stropt[pos++] = strdup ("channel");
+        stropt[pos] = (char *) malloc (10);
+        snprintf (stropt[pos], 10, "%d", co.id);
+        pos++;
+        stropt[pos] = NULL;
+    }
+    else
+    {
+#endif
+        if ((c->fd = getPtyMaster (&a, &b)) < 0)
+        {
+            log (LOG_WARN, "%s: unable to allocate pty, abandoning!\n",
+                 __FUNCTION__);
+            return -EINVAL;
+        }
+
+        /* set fd opened above to not echo so we don't see read our own packets
+           back of the file descriptor that we just wrote them to */
+        tcgetattr (c->fd, &ptyconf);
+        *(c->oldptyconf) = ptyconf;
+        ptyconf.c_cflag &= ~(ICANON | ECHO);
+        tcsetattr (c->fd, TCSANOW, &ptyconf);
+
+        snprintf (tty, sizeof (tty), "/dev/tty%c%c", a, b);
+        fd2 = open (tty, O_RDWR);
+
+#ifdef USE_KERNEL
+    }
+#endif
+    str = stropt[0];
+#ifdef DEBUG_PPPD
+    log (LOG_DEBUG, "%s: I'm running:  ", __FUNCTION__);
+    for (x = 0; stropt[x]; x++)
+    {
+        log (LOG_DEBUG, "\"%s\" ", stropt[x]);
+    };
+    log (LOG_DEBUG, "\n");
+#endif
+    c->pppd = fork ();
+    if (c->pppd < 0)
+    {
+        log (LOG_WARN, "%s: unable to fork(), abandoning!\n", __FUNCTION__);
+        return -EINVAL;
+    }
+    else if (!c->pppd)
+    {
+        struct call *sc;
+        struct tunnel *st;
+
+        close (0);
+        close (1);
+        close (2);
+#ifdef USE_KERNEL
+        if (!kernel_support && (fd2 < 0))
+#else
+        if (fd2 < 0)
+#endif
+        {
+            log (LOG_WARN, "%s: Unable to open %s to launch pppd!\n",
+                 __FUNCTION__, tty);
+            exit (1);
+        }
+        dup2 (fd2, 0);
+        dup2 (fd2, 1);
+
+
+        /* close all the calls pty fds */
+        st = tunnels.head;
+        while (st)
+        {
+            sc = st->call_head;
+            while (sc)
+            {
+                close (sc->fd);
+                sc = sc->next;
+            }
+            st = st->next;
+        }
+
+        /* close the UDP socket fd */
+        close (server_socket);
+
+        /* close the control pipe fd */
+        close (control_fd);
+
+        if( c->dialing[0] )
+        {
+            setenv( "CALLER_ID", c->dialing, 1 );
+        }
+        execv (PPPD, stropt);
+        log (LOG_WARN, "%s: Exec of %s failed!\n", __FUNCTION__, PPPD);
+        exit (1);
+    };
+    close (fd2);
+    pos = 0;
+    while (stropt[pos])
+    {
+        free (stropt[pos]);
+        pos++;
+    };
+    return 0;
+}
+
+void destroy_tunnel (struct tunnel *t)
+{
+    /*
+     * Immediately destroy a tunnel (and all its calls)
+     * and free its resources.  This may be called
+     * by the tunnel itself,so it needs to be
+     * "suicide safe"
+     */
+
+    struct call *c, *me;
+    struct tunnel *p;
+    struct timeval tv;
+    if (!t)
+        return;
+
+    /*
+     * Save ourselves until the very
+     * end, since we might be calling this ourselves.
+     * We must divorce ourself from the tunnel
+     * structure, however, to avoid recursion
+     * because of the logic of the destroy_call
+     */
+    me = t->self;
+
+    /*
+     * Destroy all the member calls
+     */
+    c = t->call_head;
+    while (c)
+    {
+        destroy_call (c);
+        c = c->next;
+    };
+    /*
+     * Remove ourselves from the list of tunnels
+     */
+
+    if (tunnels.head == t)
+    {
+        tunnels.head = t->next;
+        tunnels.count--;
+    }
+    else
+    {
+        p = tunnels.head;
+        if (p)
+        {
+            while (p->next && (p->next != t))
+                p = p->next;
+            if (p->next)
+            {
+                p->next = t->next;
+                tunnels.count--;
+            }
+            else
+            {
+                log (LOG_WARN,
+                     "%s: unable to locate tunnel in tunnel list\n",
+                     __FUNCTION__);
+            }
+        }
+        else
+        {
+            log (LOG_WARN, "%s: tunnel list is empty!\n", __FUNCTION__);
+        }
+    }
+    if (t->lac)
+    {
+        t->lac->t = NULL;
+        if (t->lac->redial && (t->lac->rtimeout > 0) && !t->lac->rsched &&
+            t->lac->active)
+        {
+            log (LOG_LOG, "%s: Will redial in %d seconds\n", __FUNCTION__,
+                 t->lac->rtimeout);
+            tv.tv_sec = t->lac->rtimeout;
+            tv.tv_usec = 0;
+            t->lac->rsched = schedule (tv, magic_lac_dial, t->lac);
+        }
+    }
+    /* XXX L2TP/IPSec: remove relevant SAs here?  NTB 20011010
+     * XXX But what if another tunnel is using same SA?
+     */
+    if (t->lns)
+        t->lns->t = NULL;
+    free (t);
+    free (me);
+}
+
+struct tunnel *l2tp_call (char *host, int port, struct lac *lac,
+                          struct lns *lns)
+{
+    /*
+     * Establish a tunnel from us to host
+     * on port port
+     */
+    struct call *tmp = NULL;
+    struct hostent *hp;
+    unsigned int addr;
+    port = htons (port);
+    hp = gethostbyname (host);
+    if (!hp)
+    {
+        log (LOG_WARN, "%s: gethostbyname() failed for %s.\n", __FUNCTION__,
+             host);
+        return NULL;
+    }
+    bcopy (hp->h_addr, &addr, hp->h_length);
+    /* Force creation of a new tunnel
+       and set it's tid to 0 to cause
+       negotiation to occur */
+    /* XXX L2TP/IPSec: Set up SA to addr:port here?  NTB 20011010
+     */
+    tmp = get_call (0, 0, addr, port);
+    if (!tmp)
+    {
+        log (LOG_WARN, "%s: Unable to create tunnel to %s.\n", __FUNCTION__,
+             host);
+        return NULL;
+    }
+    tmp->container->tid = 0;
+    tmp->container->lac = lac;
+    tmp->container->lns = lns;
+    tmp->lac = lac;
+    tmp->lns = lns;
+    if (lac)
+        lac->t = tmp->container;
+    if (lns)
+        lns->t = tmp->container;
+    /*
+     * Since our state is 0, we will establish a tunnel now
+     */
+    log (LOG_LOG, "%s:Connecting to host %s, port %d\n", __FUNCTION__, host,
+         ntohs (port));
+    control_finish (tmp->container, tmp);
+    return tmp->container;
+}
+
+void magic_lac_tunnel (void *data)
+{
+    struct lac *lac;
+    lac = (struct lac *) data;
+    if (!lac)
+    {
+        log (LOG_WARN, "%s: magic_lac_tunnel: called on NULL lac!\n",
+             __FUNCTION__);
+        return;
+    }
+    if (lac->lns)
+    {
+        /* FIXME: I should try different LNS's if I get failures */
+        l2tp_call (lac->lns->hostname, lac->lns->port, lac, NULL);
+        return;
+    }
+    else if (deflac && deflac->lns)
+    {
+        l2tp_call (deflac->lns->hostname, deflac->lns->port, lac, NULL);
+        return;
+    }
+    else
+    {
+        log (LOG_WARN, "%s: Unable to find hostname to dial for '%s'\n",
+             __FUNCTION__, lac->entname);
+        return;
+    }
+}
+
+struct call *lac_call (int tid, struct lac *lac, struct lns *lns)
+{
+    struct tunnel *t = tunnels.head;
+    struct call *tmp;
+    while (t)
+    {
+        if (t->ourtid == tid)
+        {
+            tmp = new_call (t);
+            if (!tmp)
+            {
+                log (LOG_WARN, "%s: unable to create new call\n",
+                     __FUNCTION__);
+                return NULL;
+            }
+            tmp->next = t->call_head;
+            t->call_head = tmp;
+            t->count++;
+            tmp->cid = 0;
+            tmp->lac = lac;
+            tmp->lns = lns;
+            if (lac)
+                lac->c = tmp;
+            log (LOG_LOG, "%s: Calling on tunnel %d\n", __FUNCTION__, tid);
+            strcpy (tmp->dial_no, dial_no_tmp); /*  jz: copy dialnumber to tmp->dial_no  */
+            control_finish (t, tmp);
+            return tmp;
+        }
+        t = t->next;
+    };
+    log (LOG_DEBUG, "%s: No such tunnel %d to generate call.\n", __FUNCTION__,
+         tid);
+    return NULL;
+}
+
+void magic_lac_dial (void *data)
+{
+    struct lac *lac;
+    lac = (struct lac *) data;
+
+    if (!lac)
+    {
+        log (LOG_WARN, "%s : called on NULL lac!\n", __FUNCTION__);
+        return;
+    }
+        if (!lac->active)
+    {
+        log (LOG_DEBUG, "%s: LAC %s not active", __FUNCTION__, lac->entname);
+        return;
+    }
+    lac->rsched = NULL;
+    lac->rtries++;
+    if (lac->rmax && (lac->rtries > lac->rmax))
+    {
+        log (LOG_LOG, "%s: maximum retries exceeded.\n", __FUNCTION__);
+        return;
+    }
+    if (!lac->t)
+    {
+#ifdef DEGUG_MAGIC
+        log (LOG_DEBUG, "%s : tunnel not up!  Connecting!\n", __FUNCTION__);
+#endif
+        magic_lac_tunnel (lac);
+        return;
+    }
+    lac_call (lac->t->ourtid, lac, NULL);
+}
+
+void lac_hangup (int cid)
+{
+    struct tunnel *t = tunnels.head;
+    struct call *tmp;
+    while (t)
+    {
+        tmp = t->call_head;
+        while (tmp)
+        {
+            if (tmp->ourcid == cid)
+            {
+                log (LOG_LOG,
+                     "%s :Hanging up call %d, Local: %d, Remote: %d\n",
+                     __FUNCTION__, tmp->serno, tmp->ourcid, tmp->cid);
+                strcpy (tmp->errormsg, "Goodbye!");
+/*                              tmp->needclose = -1; */
+                kill (tmp->pppd, SIGTERM);
+                return;
+            }
+            tmp = tmp->next;
+        }
+        t = t->next;
+    };
+    log (LOG_DEBUG, "%s : No such call %d to hang up.\n", __FUNCTION__, cid);
+    return;
+}
+
+void lac_disconnect (int tid)
+{
+    struct tunnel *t = tunnels.head;
+    while (t)
+    {
+        if (t->ourtid == tid)
+        {
+            log (LOG_LOG,
+                 "%s: Disconnecting from %s, Local: %d, Remote: %d\n",
+                 __FUNCTION__, IPADDY (t->peer.sin_addr), t->ourtid, t->tid);
+            t->self->needclose = -1;
+            strcpy (t->self->errormsg, "Goodbye!");
+            call_close (t->self);
+            return;
+        }
+        t = t->next;
+    };
+    log (LOG_DEBUG, "%s: No such tunnel %d to hang up.\n", __FUNCTION__, tid);
+    return;
+}
+
+struct tunnel *new_tunnel ()
+{
+    struct tunnel *tmp = malloc (sizeof (struct tunnel));
+    char entropy_buf[2] = "\0";
+    if (!tmp)
+        return NULL;
+    tmp->control_seq_num = 0;
+    tmp->control_rec_seq_num = 0;
+    tmp->cLr = 0;
+    tmp->call_head = NULL;
+    tmp->next = NULL;
+    tmp->debug = -1;
+    tmp->tid = -1;
+    tmp->hello = NULL;
+#ifndef TESTING
+/*      while(get_call((tmp->ourtid = rand() & 0xFFFF),0,0,0)); */
+#ifdef USE_KERNEL
+    if (kernel_support)
+        tmp->ourtid = ioctl (server_socket, L2TPIOCADDTUNNEL, 0);
+    else
+#endif
+/*        tmp->ourtid = rand () & 0xFFFF; */
+        /* get_entropy((char *)&tmp->ourtid, 2); */
+        get_entropy(entropy_buf, 2);
+        {
+            int *temp;
+            temp = (int *)entropy_buf;
+            tmp->ourtid = *temp & 0xFFFF;
+#ifdef DEBUG_ENTROPY
+            log(LOG_DEBUG, "ourtid = %u, entropy_buf = %hx\n", tmp->ourtid, *temp);
+#endif
+        }
+#else
+    tmp->ourtid = 0x6227;
+#endif
+    tmp->nego = 0;
+    tmp->count = 0;
+    tmp->state = 0;             /* Nothing */
+    tmp->peer.sin_family = AF_INET;
+    tmp->peer.sin_port = 0;
+    bzero (&(tmp->peer.sin_addr), sizeof (tmp->peer.sin_addr));
+    tmp->sanity = -1;
+    tmp->qtid = -1;
+    tmp->ourfc = ASYNC_FRAMING | SYNC_FRAMING;
+    tmp->ourbc = 0;
+    tmp->ourtb = (((_u64) rand ()) << 32) | ((_u64) rand ());
+    tmp->fc = -1;               /* These really need to be specified by the peer */
+    tmp->bc = -1;               /* And we want to know if they forgot */
+    tmp->hostname[0] = 0;
+    tmp->vendor[0] = 0;
+    tmp->secret[0] = 0;
+    if (!(tmp->self = new_call (tmp)))
+    {
+        free (tmp);
+        return NULL;
+    };
+    tmp->ourrws = DEFAULT_RWS_SIZE;
+    tmp->self->ourfbit = FBIT;
+    tmp->lac = NULL;
+    tmp->lns = NULL;
+    tmp->chal_us.state = 0;
+    tmp->chal_us.secret[0] = 0;
+    memset (tmp->chal_us.reply, 0, MD_SIG_SIZE);
+    tmp->chal_them.state = 0;
+    tmp->chal_them.secret[0] = 0;
+    memset (tmp->chal_them.reply, 0, MD_SIG_SIZE);
+    tmp->chal_them.vector = (unsigned char *) malloc (VECTOR_SIZE);
+    tmp->chal_us.vector = NULL;
+    tmp->hbit = 0;
+    return tmp;
+}
+
+void do_control ()
+{
+    char buf[1024];
+    char *host, *tunstr, *callstr, *tmpstr;
+    struct lac *lac;
+    int call;
+    int tunl;
+    int cnt = -1;
+    while (cnt)
+    {
+        cnt = read (control_fd, buf, sizeof (buf));
+        if (cnt > 0)
+        {
+            if (buf[cnt - 1] == '\n')
+                buf[--cnt] = 0;
+#ifdef DEBUG_CONTROL
+            log (LOG_DEBUG, "%s: Got message \"%s\" (%d bytes long)\n",
+                 __FUNCTION__, buf, cnt);
+#endif
+            switch (buf[0])
+            {
+            case 't':
+                host = strchr (buf, ' ');
+                                if(!host)
+                                        goto out;
+                                host++;
+#ifdef DEBUG_CONTROL
+                log (LOG_DEBUG, "%s: Attempting to tunnel to %s\n",
+                     __FUNCTION__, host);
+#endif
+                l2tp_call (host, UDP_LISTEN_PORT, NULL, NULL);
+                break;
+            case 'c':              /* option 'c' for incoming call */
+            case 'o':          /* option 'o' for outgoing call */
+                                tunstr = strchr (buf, ' ');
+                                if(!tunstr)
+                                        goto out;
+                                tunstr++;
+
+                                if(buf[0] == 'c')
+                        switch_io = 1;  /* Switch for Incoming Calls */
+                                else {
+                        switch_io = 0;  /* Switch for Outgoing Calls */
+                                        tmpstr = strchr(tunstr, ' ');
+                                        if(!tmpstr)
+                                                goto out;
+                                        strncpy(dial_no_tmp,tmpstr, sizeof(*dial_no_tmp));
+                                }
+                
+                lac = laclist;
+                while (lac)
+                {
+                    if (!strcasecmp (lac->entname, tunstr))
+                    {
+                        lac->active = -1;
+                        lac->rtries = 0;
+                        if (!lac->c)
+                            magic_lac_dial (lac);
+                        else
+                            log (LOG_DEBUG,
+                                 "%s: Session '%s' already active!\n",
+                                 __FUNCTION__, lac->entname);
+                        break;
+                    }
+                    lac = lac->next;
+                }
+                if (lac)
+                    break;
+                tunl = atoi (tunstr);
+                if (!tunl)
+                {
+                    log (LOG_DEBUG, "%s: No such tunnel '%s'\n", __FUNCTION__,
+                         tunstr);
+                    break;
+                }
+#ifdef DEBUG_CONTROL
+                log (LOG_DEBUG, "%s: Attempting to call on tunnel %d\n",
+                     __FUNCTION__, tunl);
+#endif
+                lac_call (tunl, NULL, NULL);
+                break;
+            case 'h':
+                callstr = strchr (buf, ' ');
+                if(!callstr)
+                                        goto out;
+                                callstr++;
+
+                call = atoi (callstr);
+#ifdef DEBUG_CONTROL
+                log (LOG_DEBUG, "%s: Attempting to call %d\n", __FUNCTION__,
+                     call);
+#endif
+                lac_hangup (call);
+                break;
+            case 'd':
+                tunstr = strchr (buf, ' ');
+                if(!tunstr)
+                                        goto out;
+                                tunstr++;
+
+                lac = laclist;
+                while (lac)
+                {
+                    if (!strcasecmp (lac->entname, tunstr))
+                    {
+                        lac->active = 0;
+                        lac->rtries = 0;
+                        if (lac->t)
+                            lac_disconnect (lac->t->ourtid);
+                        else
+                            log (LOG_DEBUG, "%s: Session '%s' not up\n",
+                                 __FUNCTION__, lac->entname);
+                        break;
+                    }
+                    lac = lac->next;
+                }
+                if (lac)
+                    break;
+                tunl = atoi (tunstr);
+                if (!tunl)
+                {
+                    log (LOG_DEBUG, "%s: No such tunnel '%s'\n", __FUNCTION__,
+                         tunstr);
+                    break;
+                }
+#ifdef DEBUG_CONTROL
+                log (LOG_DEBUG, "%s: Attempting to disconnect tunnel %d\n",
+                     __FUNCTION__, tunl);
+#endif
+                lac_disconnect (tunl);
+                break;
+            case 's':
+                show_status ();
+                break;
+            default:
+                log (LOG_DEBUG, "%s: Unknown command %c\n", __FUNCTION__,
+                     buf[0]);
+            }
+        }
+    }
+
+out:
+    /* Otherwise select goes nuts */
+    close (control_fd);
+    control_fd = open (CONTROL_PIPE, O_RDONLY | O_NONBLOCK, 0600);
+}
+
+void usage(void) {
+    printf("Usage: l2tpd -D -c [config file] -s [secret file] -p [pid file]\n");
+    printf("\n");
+    exit(1);
+}
+
+void init_args(int argc, char *argv[]) {
+    int i=0;
+    gconfig.daemon=1;
+    memset(gconfig.altauthfile,0,STRLEN);
+    memset(gconfig.altconfigfile,0,STRLEN);
+    memset(gconfig.authfile,0,STRLEN);
+    memset(gconfig.configfile,0,STRLEN);
+    memset(gconfig.pidfile,0,STRLEN);
+    strncpy(gconfig.altauthfile,ALT_DEFAULT_AUTH_FILE,
+            sizeof(gconfig.altauthfile) - 1);
+    strncpy(gconfig.altconfigfile,ALT_DEFAULT_CONFIG_FILE,
+            sizeof(gconfig.altconfigfile) - 1);
+    strncpy(gconfig.authfile,DEFAULT_AUTH_FILE,
+            sizeof(gconfig.authfile) - 1);
+    strncpy(gconfig.configfile,DEFAULT_CONFIG_FILE,
+            sizeof(gconfig.configfile) - 1);
+    strncpy(gconfig.pidfile,DEFAULT_PID_FILE,
+            sizeof(gconfig.pidfile) - 1);
+    for (i = 1; i < argc; i++) {
+        if(! strncmp(argv[i],"-c",2)) {
+            if(++i == argc)
+                usage();
+            else
+                strncpy(gconfig.configfile,argv[i],
+                        sizeof(gconfig.configfile) - 1);
+        }
+        else if (! strncmp(argv[i],"-D",2)) {
+            gconfig.daemon=0;
+        }
+        else if (! strncmp(argv[i],"-s",2)) {
+            if(++i == argc)
+                usage();
+            else
+                strncpy(gconfig.authfile,argv[i],
+                        sizeof(gconfig.authfile) - 1);
+        }
+        else if (! strncmp(argv[i],"-p",2)) {
+            if(++i == argc)
+                usage();
+            else
+                strncpy(gconfig.pidfile,argv[i],
+                        sizeof(gconfig.pidfile) - 1);
+        }
+        else {
+            usage();
+        }
+    }
+}
+
+
+void daemonize() {
+    int pid=0;
+    int i,l;
+    char buf[STRLEN];
+
+    if((pid = fork()) < 0) {
+        log(LOG_LOG, "%s: Unable to fork ()\n",__FUNCTION__);
+        close(server_socket);
+        exit(1);
+    }
+    else if (pid)
+        exit(0);
+
+
+        close(0);
+        close(1);
+        close(2);
+        dup2(open("/dev/null", O_RDONLY), 0);
+        dup2(open("/dev/null", O_RDONLY), 1);
+        dup2(open("/dev/null", O_RDONLY), 2);
+
+    /* Read previous pid file. */
+    if((i = open(gconfig.pidfile,O_RDONLY)) > 0) {
+                l=read(i,buf,sizeof(buf)-1);                                                             
+        if (l >= 0) {
+                buf[l] = '\0';                                                                       
+                pid = atoi(buf);                                                                     
+        }
+                close(i);
+
+                /* if pid is read and process exist exit */
+        if(pid && !kill(pid, 0)) {
+            log(LOG_LOG, "%s: There's already a l2tpd server running.\n",
+                    __FUNCTION__);
+            close(server_socket);
+            exit(1);
+        }
+
+                /* remove stalled pid file */
+                unlink(gconfig.pidfile);
+    }
+
+    pid = setsid();
+
+        /* create new pid file */
+        if ((i = open (gconfig.pidfile, O_WRONLY | O_CREAT, 0644)) >= 0) {
+                snprintf (buf, sizeof(buf), "%d", (int)getpid());
+                write (i, buf, strlen(buf));
+                close (i);
+        }
+        else {
+                log(LOG_LOG, "%s: could not write pid file %s error %d",
+                                __FUNCTION__, gconfig.pidfile, i);
+                close(server_socket);
+                exit(1);
+        }
+}
+
+
+void init (int argc,char *argv[])
+{
+    struct lac *lac;
+    struct in_addr listenaddr;
+
+    init_args (argc,argv);
+    srand( time(NULL) );
+    rand_source = 0;
+    init_addr ();
+    if (init_config ())
+    {
+        log (LOG_CRIT, "%s: Unable to load config file\n", __FUNCTION__);
+        exit (1);
+    }
+    if (uname (&uts))
+    {
+        log (LOG_CRIT, "%s : Unable to determine host system\n",
+             __FUNCTION__);
+        exit (1);
+    }
+    init_tunnel_list (&tunnels);
+    if (init_network ())
+        exit (1);
+    if (gconfig.daemon)
+        daemonize ();
+    signal (SIGTERM, &death_handler);
+    signal (SIGINT, &death_handler);
+    signal (SIGCHLD, &child_handler);
+    signal (SIGUSR1, &status_handler);
+    signal (SIGHUP, &null_handler);
+    init_scheduler ();
+    mkfifo (CONTROL_PIPE, 0600);
+    control_fd = open (CONTROL_PIPE, O_RDONLY | O_NONBLOCK, 0600);
+    if (control_fd < 0)
+    {
+        log (LOG_CRIT, "%s: Unable to open " CONTROL_PIPE " for reading.",
+             __FUNCTION__);
+        exit (1);
+    }
+    log (LOG_LOG, "l2tpd version " SERVER_VERSION " started on %s PID:%d\n",
+         hostname, getpid ());
+    listenaddr.s_addr = gconfig.listenaddr;
+    log (LOG_LOG, "%s version %s on a %s, listening on IP address %s, port %d\n", uts.sysname,
+       uts.release, uts.machine, inet_ntoa(listenaddr), gconfig.port);
+    lac = laclist;
+    while (lac)
+    {
+        if (lac->autodial)
+        {
+#ifdef DEBUG_MAGIC
+            log (LOG_DEBUG, "%s: Autodialing '%s'\n", __FUNCTION__,
+                 lac->entname[0] ? lac->entname : "(unnamed)");
+#endif
+            lac->active = -1;
+            switch_io = 1;      /* If we're a LAC, autodials will be ICRQ's */
+            magic_lac_dial (lac);
+        }
+        lac = lac->next;
+    }
+}
+
+int main (int argc, char *argv[])
+{
+    init(argc,argv);
+    dial_no_tmp = calloc (128, sizeof (char));
+    network_thread ();
+    return 0;
+}