ppp: add support for kernel mode pptp - add ppp-mod-pptp, based on patch by Daniel Golle <dgolle@allnet.de> - add netifd integration for pptp to ppp.sh

SVN-Revision: 32197

1 files changed, 3065 insertions, 0 deletions

diff --git a/package/ppp/patches/500-add-pptp-plugin.patch b/package/ppp/patches/500-add-pptp-plugin.patch
new file mode 100644
index 0000000000..d984e1b162
--- /dev/null
+++ b/package/ppp/patches/500-add-pptp-plugin.patch
@@ -0,0 +1,3065 @@
+--- a/configure
++++ b/configure
+@@ -195,7 +195,7 @@ if [ -d "$ksrc" ]; then
+     mkmkf $ksrc/Makedefs$compiletype Makedefs.com
+     for dir in pppd pppstats chat pppdump pppd/plugins pppd/plugins/rp-pppoe \
+ 	       pppd/plugins/radius pppd/plugins/pppoatm \
+-	       pppd/plugins/pppol2tp; do
++	       pppd/plugins/pppol2tp pppd/plugins/pptp ; do
+ 	mkmkf $dir/Makefile.$makext $dir/Makefile
+     done
+     if [ -f $ksrc/Makefile.$makext$archvariant ]; then
+--- a/pppd/plugins/Makefile.linux
++++ b/pppd/plugins/Makefile.linux
+@@ -9,7 +9,7 @@ BINDIR = $(DESTDIR)/sbin
+ MANDIR = $(DESTDIR)/share/man/man8
+ LIBDIR = $(DESTDIR)/lib/pppd/$(VERSION)
+ 
+-SUBDIRS := rp-pppoe pppoatm pppol2tp
++SUBDIRS := rp-pppoe pppoatm pppol2tp pptp
+ # Uncomment the next line to include the radius authentication plugin
+ SUBDIRS += radius
+ PLUGINS := minconn.so passprompt.so passwordfd.so winbind.so
+--- /dev/null
++++ b/pppd/plugins/pptp/Makefile.linux
+@@ -0,0 +1,31 @@
++#
++# This program may be distributed according to the terms of the GNU
++# General Public License, version 2 or (at your option) any later version.
++#
++# $Id: Makefile.linux,v 1.9 2012/05/04 21:48:00 dgolle Exp $
++#***********************************************************************
++
++DESTDIR = $(INSTROOT)@DESTDIR@
++LIBDIR = $(DESTDIR)/lib/pppd/$(PPPDVERSION)
++
++PPPDVERSION = $(shell awk -F '"' '/VERSION/ { print $$2; }' ../../patchlevel.h)
++
++INSTALL	= install
++
++COPTS=-O2 -g
++CFLAGS  = $(COPTS) -I. -I../.. -I../../../include -fPIC -DPPPD_VERSION=\"$(PPPDVERSION)\"
++all: pptp.so
++
++%.o: %.c
++	$(CC) $(CFLAGS) -c -o $@ $<
++
++pptp.so: dirutil.o orckit_quirks.o pptp.o pptp_callmgr.o pptp_ctrl.o pptp_quirks.o util.o vector.o
++	$(CC) -o pptp.so -shared dirutil.o orckit_quirks.o pptp.o pptp_callmgr.o pptp_ctrl.o pptp_quirks.o util.o vector.o
++
++install: all
++	$(INSTALL) -d -m 755 $(LIBDIR)
++	$(INSTALL) -c -m 4550 pptp.so $(LIBDIR)
++
++clean:
++	rm -f *.o *.so
++
+--- /dev/null
++++ b/pppd/plugins/pptp/dirutil.c
+@@ -0,0 +1,68 @@
++/* dirutil.c ... directory utilities.
++ *               C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: dirutil.c,v 1.2 2003/06/17 17:25:47 reink Exp $
++ */
++
++#include <sys/stat.h>
++#include <sys/types.h>
++#include <unistd.h>
++#include <string.h>
++#include <stdlib.h>
++#include "dirutil.h"
++
++/* Returned malloc'ed string representing basename */
++char *basenamex(char *pathname)
++{
++    char *dup = strdup(pathname);
++    char *ptr = strrchr(stripslash(dup), '/');
++    if (ptr == NULL) return dup;
++    ptr = strdup(ptr+1);
++    free(dup);
++    return ptr;
++}
++
++/* Return malloc'ed string representing directory name (no trailing slash) */
++char *dirnamex(char *pathname)
++{
++    char *dup = strdup(pathname);
++    char *ptr = strrchr(stripslash(dup), '/');
++    if (ptr == NULL) { free(dup); return strdup("."); }
++    if (ptr == dup && dup[0] == '/') ptr++;
++    *ptr = '\0';
++    return dup;
++}
++
++/* In-place modify a string to remove trailing slashes.  Returns arg.
++ * stripslash("/") returns "/";
++ */
++char *stripslash(char *pathname) {
++    int len = strlen(pathname);
++    while (len > 1 && pathname[len - 1] == '/')
++        pathname[--len] = '\0';
++    return pathname;
++}
++
++/* ensure dirname exists, creating it if necessary. */
++int make_valid_path(char *dir, mode_t mode)
++{
++    struct stat st;
++    char *tmp = NULL, *path = stripslash(strdup(dir));
++    int retval;
++    if (stat(path, &st) == 0) { /* file exists */
++        if (S_ISDIR(st.st_mode)) { retval = 1; goto end; }
++        else { retval = 0; goto end; } /* not a directory.  Oops. */
++    }
++    /* Directory doesn't exist.  Let's make it. */
++    /*   Make parent first. */
++    if (!make_valid_path(tmp = dirnamex(path), mode)) { retval = 0; goto end; }
++    /*   Now make this 'un. */
++    if (mkdir(path, mode) < 0) { retval = 0; goto end; }
++    /* Success. */
++    retval = 1;
++
++end:
++    if (tmp != NULL) free(tmp);
++    if (path != NULL) free(path);
++    return retval;
++}
+--- /dev/null
++++ b/pppd/plugins/pptp/dirutil.h
+@@ -0,0 +1,14 @@
++/* dirutil.h ... directory utilities.
++ *               C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: dirutil.h,v 1.1.1.1 2000/12/23 08:19:51 scott Exp $
++ */
++
++/* Returned malloc'ed string representing basename */
++char *basenamex(char *pathname);
++/* Return malloc'ed string representing directory name (no trailing slash) */
++char *dirnamex(char *pathname);
++/* In-place modify a string to remove trailing slashes.  Returns arg. */
++char *stripslash(char *pathname);
++/* ensure dirname exists, creating it if necessary. */
++int make_valid_path(char *dirname, mode_t mode);
+--- /dev/null
++++ b/pppd/plugins/pptp/orckit_quirks.c
+@@ -0,0 +1,86 @@
++/* orckit_quirks.c ...... fix quirks in orckit adsl modems
++ *                        mulix <mulix@actcom.co.il>
++ *
++ * $Id: orckit_quirks.c,v 1.3 2002/03/01 01:23:36 quozl Exp $
++ */
++
++#include <string.h>
++#include <sys/types.h>
++#include <netinet/in.h>
++#include "pptp_msg.h"
++#include "pptp_options.h"
++#include "pptp_ctrl.h"
++#include "util.h"
++
++
++
++/* return 0 on success, non zero otherwise */
++int
++orckit_atur3_build_hook(struct pptp_out_call_rqst* packet)
++{
++    unsigned int name_length = 10;
++
++    struct pptp_out_call_rqst fixed_packet = {
++	PPTP_HEADER_CTRL(PPTP_OUT_CALL_RQST),
++	0, /* hton16(call->callid) */
++	0, /* hton16(call->sernum) */
++	hton32(PPTP_BPS_MIN), hton32(PPTP_BPS_MAX),
++	hton32(PPTP_BEARER_DIGITAL), hton32(PPTP_FRAME_ANY),
++	hton16(PPTP_WINDOW), 0, hton16(name_length), 0,
++	{'R','E','L','A','Y','_','P','P','P','1',0}, {0}
++    };
++
++    if (!packet)
++	return -1;
++
++    memcpy(packet, &fixed_packet, sizeof(*packet));
++
++    return 0;
++}
++
++/* return 0 on success, non zero otherwise */
++int
++orckit_atur3_set_link_hook(struct pptp_set_link_info* packet,
++			   int peer_call_id)
++{
++    struct pptp_set_link_info fixed_packet = {
++	PPTP_HEADER_CTRL(PPTP_SET_LINK_INFO),
++	hton16(peer_call_id),
++	0,
++	0xffffffff,
++	0xffffffff};
++
++    if (!packet)
++	return -1;
++
++    memcpy(packet, &fixed_packet, sizeof(*packet));
++    return 0;
++}
++
++/* return 0 on success, non 0 otherwise */
++int
++orckit_atur3_start_ctrl_conn_hook(struct pptp_start_ctrl_conn* packet)
++{
++    struct pptp_start_ctrl_conn fixed_packet = {
++	{0}, /* we'll set the header later */
++	hton16(PPTP_VERSION), 0, 0,
++	hton32(PPTP_FRAME_ASYNC), hton32(PPTP_BEARER_ANALOG),
++	hton16(0) /* max channels */,
++	hton16(0x6021),
++	{'R','E','L','A','Y','_','P','P','P','1',0}, /* hostname */
++	{'M','S',' ','W','i','n',' ','N','T',0} /* vendor */
++    };
++
++    if (!packet)
++	return -1;
++
++    /* grab the header from the original packet, since we dont
++       know if this is a request or a reply */
++    memcpy(&fixed_packet.header, &packet->header, sizeof(struct pptp_header));
++
++    /* and now overwrite the full packet, effectively preserving the header */
++    memcpy(packet, &fixed_packet, sizeof(*packet));
++    return 0;
++}
++
++
+--- /dev/null
++++ b/pppd/plugins/pptp/orckit_quirks.h
+@@ -0,0 +1,27 @@
++/* orckit_quirks.h ...... fix quirks in orckit adsl modems
++ *                        mulix <mulix@actcom.co.il>
++ *
++ * $Id: orckit_quirks.h,v 1.2 2001/11/23 03:42:51 quozl Exp $
++ */
++
++#ifndef INC_ORCKIT_QUIRKS_H_
++#define INC_ORCKIT_QUIRKS_H_
++
++#include "pptp_options.h"
++#include "pptp_ctrl.h"
++#include "pptp_msg.h"
++
++/* return 0 on success, non zero otherwise */
++int
++orckit_atur3_build_hook(struct pptp_out_call_rqst* packt);
++
++/* return 0 on success, non zero otherwise */
++int
++orckit_atur3_set_link_hook(struct pptp_set_link_info* packet,
++			   int peer_call_id);
++
++/* return 0 on success, non zero otherwise */
++int
++orckit_atur3_start_ctrl_conn_hook(struct pptp_start_ctrl_conn* packet);
++
++#endif /* INC_ORCKIT_QUIRKS_H_ */
+--- /dev/null
++++ b/pppd/plugins/pptp/pppd-pptp.8
+@@ -0,0 +1,68 @@
++.\" manual page [] for PPTP plugin for pppd 2.4
++.\" $Id: pppd-pptp.8,v 1.0 2007/10/17 13:27:17 kad Exp $
++.\" SH section heading
++.\" SS subsection heading
++.\" LP paragraph
++.\" IP indented paragraph
++.\" TP hanging label
++.TH PPPD-PPTP 8
++.SH NAME
++pptp.so \- PPTP VPN plugin for
++.BR pppd (8)
++.SH SYNOPSIS
++.B pppd
++[
++.I options
++]
++plugin pptp.so
++.SH DESCRIPTION
++.LP
++The PPTP plugin for pppd performs interaction with pptp kernel module
++and has built-in call manager (client part of PPTP).
++It pasees necessary paremeters from \fIoptions\fR into kernel module 
++to configure ppp-pptp channel. If it runs in client mode, then additionally 
++call manager starts up. PPTPD daemon automaticaly invokes this plugin
++in server mode and passes necessary options, so additional configuration
++is not needed.
++
++.SH OPTIONS for client mode
++The PPTP plugin introduces one additional pppd option:
++.TP
++.BI "pptp_server " server " (required)"
++Specifies ip address or hostname of pptp server.
++.TP
++.BI "pptp_window " packets " (optional)"
++The amount of sliding window size. 
++Set to 0 to turn off sliding window.
++    to 3-10 for low speed connections.
++    to >10 for hi speed connections.
++Default is 50
++.TP
++.BI "pptp_phone " phone " (optional)"
++The phone string that sended to pptp server.
++.SH USAGE
++Sample configuration file:
++.nf
++plugin "pptp.so"
++pptp_server 192.168.0.1
++pptp_window 100
++name myname
++remotename pptp
++noauth
++refuse-eap
++refuse-chap
++refuse-mschap
++nobsdcomp
++nodeflate
++novj
++novjccomp
++require-mppe-128
++lcp-echo-interval 20
++lcp-echo-failure  3
++.fi
++
++.SH SEE ALSO
++.BR pppd (8) "  " pptpd (8) "  " pptpd.conf (5)
++
++.SH AUTHOR
++xeb xeb@mail.ru
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp.c
+@@ -0,0 +1,323 @@
++/***************************************************************************
++ *   Copyright (C) 2006 by Kozlov D. <xeb@mail.ru>                         *
++ *   some cleanup done (C) 2012 by Daniel Golle <dgolle@allnet.de>         *
++ *                                                                         *
++ *   This program is free software; you can redistribute it and/or modify  *
++ *   it under the terms of the GNU General Public License as published by  *
++ *   the Free Software Foundation; either version 2 of the License, or     *
++ *   (at your option) any later version.                                   *
++ *                                                                         *
++ *   This program is distributed in the hope that it will be useful,       *
++ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
++ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
++ *   GNU General Public License for more details.                          *
++ *                                                                         *
++ *   You should have received a copy of the GNU General Public License     *
++ *   along with this program; if not, write to the                         *
++ *   Free Software Foundation, Inc.,                                       *
++ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
++ ***************************************************************************/
++
++#define PPTP_VERSION "1.00"
++
++#ifdef HAVE_CONFIG_H
++#include <config.h>
++#endif
++
++#include <netinet/in.h>
++#include <arpa/inet.h>
++#include <sys/un.h>
++#include <netdb.h>
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
++#include <syslog.h>
++#include <unistd.h>
++#include <signal.h>
++#include <errno.h>
++#include <fcntl.h>
++#include <sys/wait.h>
++#include <sys/ioctl.h>
++
++#include "pppd.h"
++#include "fsm.h"
++#include "lcp.h"
++#include "ipcp.h"
++#include "ccp.h"
++#include "pathnames.h"
++
++#include "pptp_callmgr.h"
++#include <net/if.h>
++#include <net/ethernet.h>
++#include <linux/if_pppox.h>
++
++#include <stdio.h>
++#include <stdlib.h>
++
++
++
++extern char** environ;
++
++char pppd_version[] = PPPD_VERSION;
++extern int new_style_driver;
++
++
++char *pptp_server = NULL;
++char *pptp_client = NULL;
++char *pptp_phone = NULL;
++int pptp_window=50;
++int pptp_sock=-1;
++struct in_addr localbind = { INADDR_NONE };
++
++static int callmgr_sock;
++static int pptp_fd;
++int call_ID;
++
++static int open_callmgr(int call_id,struct in_addr inetaddr, char *phonenr,int window);
++static void launch_callmgr(int call_is,struct in_addr inetaddr, char *phonenr,int window);
++static int get_call_id(int sock, pid_t gre, pid_t pppd, u_int16_t *peer_call_id);
++
++static option_t Options[] =
++{
++    { "pptp_server", o_string, &pptp_server,
++      "PPTP Server" },
++    { "pptp_client", o_string, &pptp_client,
++      "PPTP Client" },
++    { "pptp_sock",o_int, &pptp_sock,
++      "PPTP socket" },
++    { "pptp_phone", o_string, &pptp_phone,
++      "PPTP Phone number" },
++    { "pptp_window",o_int, &pptp_window,
++      "PPTP window" },
++    { NULL }
++};
++
++static int pptp_connect(void);
++static void pptp_disconnect(void);
++
++struct channel pptp_channel = {
++    options: Options,
++    check_options: NULL,
++    connect: &pptp_connect,
++    disconnect: &pptp_disconnect,
++    establish_ppp: &generic_establish_ppp,
++    disestablish_ppp: &generic_disestablish_ppp,
++    close: NULL,
++    cleanup: NULL
++};
++
++static int pptp_start_server(void)
++{
++	pptp_fd=pptp_sock;
++	sprintf(ppp_devnam,"pptp (%s)",pptp_client);
++
++	return pptp_fd;
++}
++static int pptp_start_client(void)
++{
++	socklen_t len;
++	struct sockaddr_pppox src_addr,dst_addr;
++	struct hostent *hostinfo;
++
++	hostinfo=gethostbyname(pptp_server);
++  if (!hostinfo)
++	{
++		error("PPTP: Unknown host %s\n", pptp_server);
++		return -1;
++	}
++	dst_addr.sa_addr.pptp.sin_addr=*(struct in_addr*)hostinfo->h_addr;
++	{
++		int sock;
++		struct sockaddr_in addr;
++		len=sizeof(addr);
++		addr.sin_addr=dst_addr.sa_addr.pptp.sin_addr;
++		addr.sin_family=AF_INET;
++		addr.sin_port=htons(1700);
++		sock=socket(AF_INET,SOCK_DGRAM,0);
++		if (connect(sock,(struct sockaddr*)&addr,sizeof(addr)))
++		{
++			close(sock);
++			error("PPTP: connect failed (%s)\n",strerror(errno));
++			return -1;
++		}
++		getsockname(sock,(struct sockaddr*)&addr,&len);
++		src_addr.sa_addr.pptp.sin_addr=addr.sin_addr;
++		close(sock);
++	}
++
++	src_addr.sa_family=AF_PPPOX;
++	src_addr.sa_protocol=PX_PROTO_PPTP;
++	src_addr.sa_addr.pptp.call_id=0;
++
++	dst_addr.sa_family=AF_PPPOX;
++	dst_addr.sa_protocol=PX_PROTO_PPTP;
++	dst_addr.sa_addr.pptp.call_id=0;
++
++	pptp_fd=socket(AF_PPPOX,SOCK_STREAM,PX_PROTO_PPTP);
++	if (pptp_fd<0)
++	{
++		error("PPTP: failed to create PPTP socket (%s)\n",strerror(errno));
++		return -1;
++	}
++	if (bind(pptp_fd,(struct sockaddr*)&src_addr,sizeof(src_addr)))
++	{
++		close(pptp_fd);
++		error("PPTP: failed to bind PPTP socket (%s)\n",strerror(errno));
++		return -1;
++	}
++	len=sizeof(src_addr);
++	getsockname(pptp_fd,(struct sockaddr*)&src_addr,&len);
++	call_ID=src_addr.sa_addr.pptp.call_id;
++
++  do {
++        /*
++         * Open connection to call manager (Launch call manager if necessary.)
++         */
++        callmgr_sock = open_callmgr(src_addr.sa_addr.pptp.call_id,dst_addr.sa_addr.pptp.sin_addr, pptp_phone, pptp_window);
++	if (callmgr_sock<0)
++	{
++		close(pptp_fd);
++		return -1;
++        }
++        /* Exchange PIDs, get call ID */
++    } while (get_call_id(callmgr_sock, getpid(), getpid(), &dst_addr.sa_addr.pptp.call_id) < 0);
++
++	if (connect(pptp_fd,(struct sockaddr*)&dst_addr,sizeof(dst_addr)))
++	{
++		close(callmgr_sock);
++		close(pptp_fd);
++		error("PPTP: failed to connect PPTP socket (%s)\n",strerror(errno));
++		return -1;
++	}
++
++	sprintf(ppp_devnam,"pptp (%s)",pptp_server);
++
++	return pptp_fd;
++}
++static int pptp_connect(void)
++{
++	if ((!pptp_server && !pptp_client) || (pptp_server && pptp_client))
++	{
++		fatal("PPTP: unknown mode (you must specify pptp_server or pptp_client option)");
++		return -1;
++	}
++
++	if (pptp_server) return pptp_start_client();
++	return pptp_start_server();
++}
++
++static void pptp_disconnect(void)
++{
++	if (pptp_server) close(callmgr_sock);
++	close(pptp_fd);
++}
++
++static int open_callmgr(int call_id,struct in_addr inetaddr, char *phonenr,int window)
++{
++    /* Try to open unix domain socket to call manager. */
++    struct sockaddr_un where;
++    const int NUM_TRIES = 3;
++    int i, fd;
++    pid_t pid;
++    int status;
++    /* Open socket */
++    if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
++    {
++        fatal("Could not create unix domain socket: %s", strerror(errno));
++    }
++    /* Make address */
++    callmgr_name_unixsock(&where, inetaddr, localbind);
++    for (i = 0; i < NUM_TRIES; i++)
++    {
++        if (connect(fd, (struct sockaddr *) &where, sizeof(where)) < 0)
++        {
++            /* couldn't connect.  We'll have to launch this guy. */
++
++            unlink (where.sun_path);
++
++            /* fork and launch call manager process */
++            switch (pid = fork())
++            {
++                case -1: /* failure */
++                    fatal("fork() to launch call manager failed.");
++                case 0: /* child */
++                {
++                    /* close the pty and gre in the call manager */
++                    close(fd);
++                    close(pptp_fd);
++                    launch_callmgr(call_id,inetaddr,phonenr,window);
++                }
++                default: /* parent */
++                    waitpid(pid, &status, 0);
++                    if (status!= 0)
++		    {
++			close(fd);
++			error("Call manager exited with error %d", status);
++			return -1;
++		    }
++                    break;
++            }
++            sleep(1);
++        }
++        else return fd;
++    }
++    close(fd);
++    error("Could not launch call manager after %d tries.", i);
++    return -1;   /* make gcc happy */
++}
++
++/*** call the call manager main ***********************************************/
++static void launch_callmgr(int call_id,struct in_addr inetaddr, char *phonenr,int window)
++{
++    dbglog("pptp: call manager for %s\n", inet_ntoa(inetaddr));
++    dbglog("window size:\t%d\n",window);
++    if (phonenr) dbglog("phone number:\t'%s'\n",phonenr);
++    dbglog("call id:\t%d\n",call_id);
++    exit(callmgr_main(inetaddr, phonenr, window, call_id));
++}
++
++/*** exchange data with the call manager  *************************************/
++/* XXX need better error checking XXX */
++static int get_call_id(int sock, pid_t gre, pid_t pppd,
++		u_int16_t *peer_call_id)
++{
++    u_int16_t m_call_id, m_peer_call_id;
++    /* write pid's to socket */
++    /* don't bother with network byte order, because pid's are meaningless
++     * outside the local host.
++     */
++    int rc;
++    rc = write(sock, &gre, sizeof(gre));
++    if (rc != sizeof(gre))
++        return -1;
++    rc = write(sock, &pppd, sizeof(pppd));
++    if (rc != sizeof(pppd))
++        return -1;
++    rc = read(sock,  &m_call_id, sizeof(m_call_id));
++    if (rc != sizeof(m_call_id))
++        return -1;
++    rc = read(sock,  &m_peer_call_id, sizeof(m_peer_call_id));
++    if (rc != sizeof(m_peer_call_id))
++        return -1;
++    /*
++     * XXX FIXME ... DO ERROR CHECKING & TIME-OUTS XXX
++     * (Rhialto: I am assuming for now that timeouts are not relevant
++     * here, because the read and write calls would return -1 (fail) when
++     * the peer goes away during the process. We know it is (or was)
++     * running because the connect() call succeeded.)
++     * (James: on the other hand, if the route to the peer goes away, we
++     * wouldn't get told by read() or write() for quite some time.)
++     */
++    *peer_call_id = m_peer_call_id;
++    return 0;
++}
++
++void plugin_init(void)
++{
++    add_options(Options);
++
++    info("PPTP plugin version %s", PPTP_VERSION);
++
++    the_channel = &pptp_channel;
++    modem = 0;
++}
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_callmgr.c
+@@ -0,0 +1,381 @@
++/* pptp_callmgr.c ... Call manager for PPTP connections.
++ *                    Handles TCP port 1723 protocol.
++ *                    C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: pptp_callmgr.c,v 1.20 2005/03/31 07:42:39 quozl Exp $
++ */
++#include <signal.h>
++#include <sys/time.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <arpa/inet.h>
++#include <sys/un.h>
++#include <unistd.h>
++#include <stdlib.h>
++#include <string.h>
++#include <assert.h>
++#include <setjmp.h>
++#include <stdio.h>
++#include <errno.h>
++#include "pptp_callmgr.h"
++#include "pptp_ctrl.h"
++#include "pptp_msg.h"
++#include "dirutil.h"
++#include "vector.h"
++#include "util.h"
++#include "pppd.h"
++
++extern struct in_addr localbind; /* from pptp.c */
++extern int call_ID;
++
++int open_inetsock(struct in_addr inetaddr);
++int open_unixsock(struct in_addr inetaddr);
++void close_inetsock(int fd, struct in_addr inetaddr);
++void close_unixsock(int fd, struct in_addr inetaddr);
++
++sigjmp_buf callmgr_env;
++
++void callmgr_sighandler(int sig) {
++    /* TODO: according to signal(2), siglongjmp() is unsafe used here */
++    siglongjmp (callmgr_env, 1);
++}
++
++void callmgr_do_nothing(int sig) {
++    /* do nothing signal handler */
++}
++
++struct local_callinfo {
++    int unix_sock;
++    pid_t pid[2];
++};
++
++struct local_conninfo {
++    VECTOR * call_list;
++    fd_set * call_set;
++};
++
++/* Call callback */
++void call_callback(PPTP_CONN *conn, PPTP_CALL *call, enum call_state state)
++{
++    struct local_callinfo *lci;
++    struct local_conninfo *conninfo;
++    u_int16_t call_id[2];
++    switch(state) {
++        case CALL_OPEN_DONE:
++            /* okey dokey.  This means that the call_id and peer_call_id are
++             * now valid, so lets send them on to our friends who requested
++             * this call.  */
++            lci = pptp_call_closure_get(conn, call); assert(lci != NULL);
++            pptp_call_get_ids(conn, call, &call_id[0], &call_id[1]);
++            write(lci->unix_sock, &call_id, sizeof(call_id));
++            /* Our duty to the fatherland is now complete. */
++            break;
++        case CALL_OPEN_FAIL:
++        case CALL_CLOSE_RQST:
++        case CALL_CLOSE_DONE:
++            /* don't need to do anything here, except make sure tables
++             * are sync'ed */
++            dbglog("Closing connection (call state)");
++            conninfo = pptp_conn_closure_get(conn);
++            lci = pptp_call_closure_get(conn, call);
++            assert(lci != NULL && conninfo != NULL);
++            if (vector_contains(conninfo->call_list, lci->unix_sock)) {
++                vector_remove(conninfo->call_list, lci->unix_sock);
++                close(lci->unix_sock);
++                FD_CLR(lci->unix_sock, conninfo->call_set);
++            }
++            break;
++        default:
++            dbglog("Unhandled call callback state [%d].", (int) state);
++            break;
++    }
++}
++
++/******************************************************************************
++ * NOTE ABOUT 'VOLATILE':
++ * several variables here get a volatile qualifier to silence warnings
++ * from older (before 3.0) gccs. if the longjmp stuff is removed,
++ * the volatile qualifiers should be removed as well.
++ *****************************************************************************/
++
++/*** Call Manager *************************************************************/
++int callmgr_main(struct in_addr inetaddr, char phonenr[], int window, int pcallid)
++{
++    int inet_sock, unix_sock;
++    fd_set call_set;
++    PPTP_CONN * conn;
++    VECTOR * call_list;
++    int max_fd = 0;
++    volatile int first = 1;
++    int retval;
++    int i;
++    if (pcallid>0) call_ID=pcallid;
++
++    /* Step 1: Open sockets. */
++    if ((inet_sock = open_inetsock(inetaddr)) < 0)
++        fatal("Could not open control connection to %s", inet_ntoa(inetaddr));
++    dbglog("control connection");
++    if ((unix_sock = open_unixsock(inetaddr)) < 0)
++        fatal("Could not open unix socket for %s", inet_ntoa(inetaddr));
++    /* Step 1b: FORK and return status to calling process. */
++    dbglog("unix_sock");
++
++    switch (fork()) {
++        case 0: /* child. stick around. */
++            break;
++        case -1: /* failure.  Fatal. */
++            fatal("Could not fork.");
++        default: /* Parent. Return status to caller. */
++            exit(0);
++    }
++    /* re-open stderr as /dev/null to release it */
++    file2fd("/dev/null", "wb", STDERR_FILENO);
++    /* Step 1c: Clean up unix socket on TERM */
++    if (sigsetjmp(callmgr_env, 1) != 0)
++        goto cleanup;
++    signal(SIGINT, callmgr_sighandler);
++    signal(SIGTERM, callmgr_sighandler);
++    signal(SIGPIPE, callmgr_do_nothing);
++    signal(SIGUSR1, callmgr_do_nothing); /* signal state change
++                                            wake up accept */
++    /* Step 2: Open control connection and register callback */
++    if ((conn = pptp_conn_open(inet_sock, 1, NULL/* callback */)) == NULL) {
++        close(unix_sock); close(inet_sock); fatal("Could not open connection.");
++    }
++    FD_ZERO(&call_set);
++    call_list = vector_create();
++    {
++        struct local_conninfo *conninfo = malloc(sizeof(*conninfo));
++        if (conninfo == NULL) {
++            close(unix_sock); close(inet_sock); fatal("No memory.");
++        }
++        conninfo->call_list = call_list;
++        conninfo->call_set  = &call_set;
++        pptp_conn_closure_put(conn, conninfo);
++    }
++    if (sigsetjmp(callmgr_env, 1) != 0) goto shutdown;
++    /* Step 3: Get FD_SETs */
++    max_fd = unix_sock;
++    do {
++        int rc;
++        fd_set read_set = call_set, write_set;
++        FD_ZERO (&write_set);
++        if (pptp_conn_established(conn)) {
++	  FD_SET (unix_sock, &read_set);
++	  if (unix_sock > max_fd) max_fd = unix_sock;
++	}
++        pptp_fd_set(conn, &read_set, &write_set, &max_fd);
++        for (; max_fd > 0 ; max_fd--) {
++            if (FD_ISSET (max_fd, &read_set) ||
++                    FD_ISSET (max_fd, &write_set))
++                break;
++        }
++        /* Step 4: Wait on INET or UNIX event */
++        if ((rc = select(max_fd + 1, &read_set, &write_set, NULL, NULL)) <0) {
++	  if (errno == EBADF) break;
++	  /* a signal or somesuch. */
++	  continue;
++	}
++        /* Step 5a: Handle INET events */
++        rc = pptp_dispatch(conn, &read_set, &write_set);
++	if (rc < 0)
++	    break;
++        /* Step 5b: Handle new connection to UNIX socket */
++        if (FD_ISSET(unix_sock, &read_set)) {
++            /* New call! */
++            struct sockaddr_un from;
++            int len = sizeof(from);
++            PPTP_CALL * call;
++            struct local_callinfo *lci;
++            int s;
++            /* Accept the socket */
++            FD_CLR (unix_sock, &read_set);
++            if ((s = accept(unix_sock, (struct sockaddr *) &from, &len)) < 0) {
++                warn("Socket not accepted: %s", strerror(errno));
++                goto skip_accept;
++            }
++            /* Allocate memory for local call information structure. */
++            if ((lci = malloc(sizeof(*lci))) == NULL) {
++                warn("Out of memory."); close(s); goto skip_accept;
++            }
++            lci->unix_sock = s;
++            /* Give the initiator time to write the PIDs while we open
++             * the call */
++            call = pptp_call_open(conn, call_ID,call_callback, phonenr,window);
++            /* Read and store the associated pids */
++            read(s, &lci->pid[0], sizeof(lci->pid[0]));
++            read(s, &lci->pid[1], sizeof(lci->pid[1]));
++            /* associate the local information with the call */
++            pptp_call_closure_put(conn, call, (void *) lci);
++            /* The rest is done on callback. */
++            /* Keep alive; wait for close */
++            retval = vector_insert(call_list, s, call); assert(retval);
++            if (s > max_fd) max_fd = s;
++            FD_SET(s, &call_set);
++            first = 0;
++        }
++skip_accept: /* Step 5c: Handle socket close */
++        for (i = 0; i < max_fd + 1; i++)
++            if (FD_ISSET(i, &read_set)) {
++                /* close it */
++                PPTP_CALL * call;
++                retval = vector_search(call_list, i, &call);
++                if (retval) {
++                    struct local_callinfo *lci =
++                        pptp_call_closure_get(conn, call);
++                    dbglog("Closing connection (unhandled)");
++                    free(lci);
++                    /* soft shutdown.  Callback will do hard shutdown later */
++                    pptp_call_close(conn, call);
++                    vector_remove(call_list, i);
++                }
++                FD_CLR(i, &call_set);
++                close(i);
++            }
++    } while (vector_size(call_list) > 0 || first);
++shutdown:
++    {
++        int rc;
++        fd_set read_set, write_set;
++        struct timeval tv;
++	signal(SIGINT, callmgr_do_nothing);
++	signal(SIGTERM, callmgr_do_nothing);
++        /* warn("Shutdown"); */
++        /* kill all open calls */
++        for (i = 0; i < vector_size(call_list); i++) {
++            PPTP_CALL *call = vector_get_Nth(call_list, i);
++            dbglog("Closing connection (shutdown)");
++            pptp_call_close(conn, call);
++        }
++        /* attempt to dispatch these messages */
++        FD_ZERO(&read_set);
++        FD_ZERO(&write_set);
++        pptp_fd_set(conn, &read_set, &write_set, &max_fd);
++	tv.tv_sec = 0;
++	tv.tv_usec = 0;
++	select(max_fd + 1, &read_set, &write_set, NULL, &tv);
++        rc = pptp_dispatch(conn, &read_set, &write_set);
++	if (rc > 0) {
++	  /* wait for a respond, a timeout because there might not be one */
++	  FD_ZERO(&read_set);
++	  FD_ZERO(&write_set);
++	  pptp_fd_set(conn, &read_set, &write_set, &max_fd);
++	  tv.tv_sec = 2;
++	  tv.tv_usec = 0;
++	  select(max_fd + 1, &read_set, &write_set, NULL, &tv);
++	  rc = pptp_dispatch(conn, &read_set, &write_set);
++	  if (rc > 0) {
++	    if (i > 0) sleep(2);
++	    /* no more open calls.  Close the connection. */
++	    pptp_conn_close(conn, PPTP_STOP_LOCAL_SHUTDOWN);
++	    /* wait for a respond, a timeout because there might not be one */
++	    FD_ZERO(&read_set);
++	    FD_ZERO(&write_set);
++	    pptp_fd_set(conn, &read_set, &write_set, &max_fd);
++	    tv.tv_sec = 2;
++	    tv.tv_usec = 0;
++	    select(max_fd + 1, &read_set, &write_set, NULL, &tv);
++	    pptp_dispatch(conn, &read_set, &write_set);
++	    if (rc > 0) sleep(2);
++	  }
++	}
++        /* with extreme prejudice */
++        pptp_conn_destroy(conn);
++        vector_destroy(call_list);
++    }
++cleanup:
++    signal(SIGINT, callmgr_do_nothing);
++    signal(SIGTERM, callmgr_do_nothing);
++    close_inetsock(inet_sock, inetaddr);
++    close_unixsock(unix_sock, inetaddr);
++    return 0;
++}
++
++/*** open_inetsock ************************************************************/
++int open_inetsock(struct in_addr inetaddr)
++{
++    struct sockaddr_in dest, src;
++    int s;
++    dest.sin_family = AF_INET;
++    dest.sin_port   = htons(PPTP_PORT);
++    dest.sin_addr   = inetaddr;
++    if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
++        warn("socket: %s", strerror(errno));
++        return s;
++    }
++    if (localbind.s_addr != INADDR_NONE) {
++        bzero(&src, sizeof(src));
++        src.sin_family = AF_INET;
++        src.sin_addr   = localbind;
++        if (bind(s, (struct sockaddr *) &src, sizeof(src)) != 0) {
++            warn("bind: %s", strerror(errno));
++            close(s); return -1;
++        }
++    }
++    if (connect(s, (struct sockaddr *) &dest, sizeof(dest)) < 0) {
++        warn("connect: %s", strerror(errno));
++        close(s); return -1;
++    }
++    return s;
++}
++
++/*** open_unixsock ************************************************************/
++int open_unixsock(struct in_addr inetaddr)
++{
++    struct sockaddr_un where;
++    struct stat st;
++    char *dir;
++    int s;
++    if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
++        warn("socket: %s", strerror(errno));
++        return s;
++    }
++    callmgr_name_unixsock( &where, inetaddr, localbind);
++    if (stat(where.sun_path, &st) >= 0)
++    {
++        warn("Call manager for %s is already running.", inet_ntoa(inetaddr));
++        close(s); return -1;
++    }
++   /* Make sure path is valid. */
++    dir = dirnamex(where.sun_path);
++    if (!make_valid_path(dir, 0770))
++        fatal("Could not make path to %s: %s", where.sun_path, strerror(errno));
++    free(dir);
++    if (bind(s, (struct sockaddr *) &where, sizeof(where)) < 0) {
++        warn("bind: %s", strerror(errno));
++        close(s); return -1;
++    }
++    chmod(where.sun_path, 0777);
++    listen(s, 127);
++    return s;
++}
++
++/*** close_inetsock ***********************************************************/
++void close_inetsock(int fd, struct in_addr inetaddr)
++{
++    close(fd);
++}
++
++/*** close_unixsock ***********************************************************/
++void close_unixsock(int fd, struct in_addr inetaddr)
++{
++    struct sockaddr_un where;
++    close(fd);
++    callmgr_name_unixsock(&where, inetaddr, localbind);
++    unlink(where.sun_path);
++}
++
++/*** make a unix socket address ***********************************************/
++void callmgr_name_unixsock(struct sockaddr_un *where,
++			   struct in_addr inetaddr,
++			   struct in_addr localbind)
++{
++    char localaddr[16], remoteaddr[16];
++    where->sun_family = AF_UNIX;
++    strncpy(localaddr,  inet_ntoa(localbind), 16);
++    strncpy(remoteaddr, inet_ntoa(inetaddr),  16);
++    snprintf(where->sun_path, sizeof(where->sun_path),
++            PPTP_SOCKET_PREFIX "%s:%i", remoteaddr,call_ID);
++}
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_callmgr.h
+@@ -0,0 +1,17 @@
++/* pptp_callmgr.h ... Call manager for PPTP connections.
++ *                    Handles TCP port 1723 protocol.
++ *                    C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: pptp_callmgr.h,v 1.3 2003/02/17 00:22:17 quozl Exp $
++ */
++
++#define PPTP_SOCKET_PREFIX "/var/run/pptp/"
++
++int callmgr_main(struct in_addr inetaddr,
++		char phonenr[],
++		int window,
++		int pcallid);
++
++void callmgr_name_unixsock(struct sockaddr_un *where,
++			   struct in_addr inetaddr,
++			   struct in_addr localbind);
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_ctrl.c
+@@ -0,0 +1,1077 @@
++/* pptp_ctrl.c ... handle PPTP control connection.
++ *                 C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: pptp_ctrl.c,v 1.31 2005/03/31 07:42:39 quozl Exp $
++ */
++
++#include <errno.h>
++#include <sys/time.h>
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <unistd.h>
++#include <stdlib.h>
++#include <assert.h>
++#include <signal.h>
++#include <string.h>
++#include <ctype.h>
++#include <fcntl.h>
++#include "pptp_msg.h"
++#include "pptp_ctrl.h"
++#include "pptp_options.h"
++#include "vector.h"
++#include "util.h"
++#include "pptp_quirks.h"
++
++/* BECAUSE OF SIGNAL LIMITATIONS, EACH PROCESS CAN ONLY MANAGE ONE
++ * CONNECTION.  SO THIS 'PPTP_CONN' STRUCTURE IS A BIT MISLEADING.
++ * WE'LL KEEP CONNECTION-SPECIFIC INFORMATION IN THERE ANYWAY (AS
++ * OPPOSED TO USING GLOBAL VARIABLES), BUT BEWARE THAT THE ENTIRE
++ * UNIX SIGNAL-HANDLING SEMANTICS WOULD HAVE TO CHANGE (OR THE
++ * TIME-OUT CODE DRASTICALLY REWRITTEN) BEFORE YOU COULD DO A
++ * PPTP_CONN_OPEN MORE THAN ONCE PER PROCESS AND GET AWAY WITH IT.
++ */
++
++/* This structure contains connection-specific information that the
++ * signal handler needs to see.  Thus, it needs to be in a global
++ * variable.  If you end up using pthreads or something (why not
++ * just processes?), this would have to be placed in a thread-specific
++ * data area, using pthread_get|set_specific, etc., so I've
++ * conveniently encapsulated it for you.
++ * [linux threads will have to support thread-specific signals
++ *  before this would work at all, which, as of this writing
++ *  (linux-threads v0.6, linux kernel 2.1.72), it does not.]
++ */
++
++/* Globals */
++
++/* control the number of times echo packets will be logged */
++static int nlogecho = 10;
++
++static struct thread_specific {
++    struct sigaction old_sigaction; /* evil signals */
++    PPTP_CONN * conn;
++} global;
++
++#define INITIAL_BUFSIZE 512 /* initial i/o buffer size. */
++
++struct PPTP_CONN {
++    int inet_sock;
++    /* Connection States */
++    enum {
++        CONN_IDLE, CONN_WAIT_CTL_REPLY, CONN_WAIT_STOP_REPLY, CONN_ESTABLISHED
++    } conn_state; /* on startup: CONN_IDLE */
++    /* Keep-alive states */
++    enum {
++        KA_NONE, KA_OUTSTANDING
++    } ka_state;  /* on startup: KA_NONE */
++    /* Keep-alive ID; monotonically increasing (watch wrap-around!) */
++    u_int32_t ka_id; /* on startup: 1 */
++    /* Other properties. */
++    u_int16_t version;
++    u_int16_t firmware_rev;
++    u_int8_t  hostname[64], vendor[64];
++    /* XXX these are only PNS properties, currently XXX */
++    /* Call assignment information. */
++    u_int16_t call_serial_number;
++    VECTOR *call;
++    void * closure;
++    pptp_conn_cb callback;
++    /******* IO buffers ******/
++    char * read_buffer, *write_buffer;
++    size_t read_alloc,   write_alloc;
++    size_t read_size,    write_size;
++};
++
++struct PPTP_CALL {
++    /* Call properties */
++    enum {
++        PPTP_CALL_PAC, PPTP_CALL_PNS
++    } call_type;
++    union {
++        enum pptp_pac_state {
++            PAC_IDLE, PAC_WAIT_REPLY, PAC_ESTABLISHED, PAC_WAIT_CS_ANS
++        } pac;
++        enum pptp_pns_state {
++            PNS_IDLE, PNS_WAIT_REPLY, PNS_ESTABLISHED, PNS_WAIT_DISCONNECT
++        } pns;
++    } state;
++    u_int16_t call_id, peer_call_id;
++    u_int16_t sernum;
++    u_int32_t speed;
++    /* For user data: */
++    pptp_call_cb callback;
++    void * closure;
++};
++
++
++/* PPTP error codes: ----------------------------------------------*/
++
++/* (General Error Codes) */
++static const struct {
++    const char *name, *desc;
++} pptp_general_errors[] = {
++#define PPTP_GENERAL_ERROR_NONE                 0
++    { "(None)", "No general error" },
++#define PPTP_GENERAL_ERROR_NOT_CONNECTED        1
++    { "(Not-Connected)", "No control connection exists yet for this "
++        "PAC-PNS pair" },
++#define PPTP_GENERAL_ERROR_BAD_FORMAT           2
++    { "(Bad-Format)", "Length is wrong or Magic Cookie value is incorrect" },
++#define PPTP_GENERAL_ERROR_BAD_VALUE            3
++    { "(Bad-Value)", "One of the field values was out of range or "
++            "reserved field was non-zero" },
++#define PPTP_GENERAL_ERROR_NO_RESOURCE          4
++    { "(No-Resource)", "Insufficient resources to handle this command now" },
++#define PPTP_GENERAL_ERROR_BAD_CALLID           5
++    { "(Bad-Call ID)", "The Call ID is invalid in this context" },
++#define PPTP_GENERAL_ERROR_PAC_ERROR            6
++    { "(PAC-Error)", "A generic vendor-specific error occured in the PAC" }
++};
++
++#define  MAX_GENERAL_ERROR ( sizeof(pptp_general_errors) / \
++        sizeof(pptp_general_errors[0]) - 1)
++
++/* Outgoing Call Reply Result Codes */
++static const char *pptp_out_call_reply_result[] = {
++/* 0 */	"Unknown Result Code",
++/* 1 */	"Connected",
++/* 2 */	"General Error",
++/* 3 */	"No Carrier Detected",
++/* 4 */	"Busy Signal",
++/* 5 */	"No Dial Tone",
++/* 6 */	"Time Out",
++/* 7 */	"Not Accepted, Call is administratively prohibited" };
++
++#define MAX_OUT_CALL_REPLY_RESULT 7
++
++/* Call Disconnect Notify  Result Codes */
++static const char *pptp_call_disc_ntfy[] = {
++/* 0 */	"Unknown Result Code",
++/* 1 */	"Lost Carrier",
++/* 2 */	"General Error",
++/* 3 */	"Administrative Shutdown",
++/* 4 */	"(your) Request" };
++
++#define MAX_CALL_DISC_NTFY 4
++
++/* Call Disconnect Notify  Result Codes */
++static const char *pptp_start_ctrl_conn_rply[] = {
++/* 0 */	"Unknown Result Code",
++/* 1 */	"Successful Channel Establishment",
++/* 2 */	"General Error",
++/* 3 */	"Command Channel Already Exists",
++/* 4 */	"Requester is not Authorized" };
++
++#define MAX_START_CTRL_CONN_REPLY 4
++
++/* timing options */
++int idle_wait = PPTP_TIMEOUT;
++int max_echo_wait = PPTP_TIMEOUT;
++
++/* Local prototypes */
++static void pptp_reset_timer(void);
++static void pptp_handle_timer();
++/* Write/read as much as we can without blocking. */
++int pptp_write_some(PPTP_CONN * conn);
++int pptp_read_some(PPTP_CONN * conn);
++/* Make valid packets from read_buffer */
++int pptp_make_packet(PPTP_CONN * conn, void **buf, size_t *size);
++/* Add packet to write_buffer */
++int pptp_send_ctrl_packet(PPTP_CONN * conn, void * buffer, size_t size);
++/* Dispatch packets (general) */
++int pptp_dispatch_packet(PPTP_CONN * conn, void * buffer, size_t size);
++/* Dispatch packets (control messages) */
++int ctrlp_disp(PPTP_CONN * conn, void * buffer, size_t size);
++/* Set link info, for pptp servers that need it.
++   this is a noop, unless the user specified a quirk and
++   there's a set_link hook defined in the quirks table
++   for that quirk */
++void pptp_set_link(PPTP_CONN * conn, int peer_call_id);
++
++/*** log error information in control packets *********************************/
++static void ctrlp_error( int result, int error, int cause,
++        const char *result_text[], int max_result)
++{
++    if( cause >= 0)
++        warn("Result code is %d '%s'. Error code is %d, Cause code is %d",
++                result, result_text[result <= max_result ?  result : 0], error,
++                cause );
++    else
++        warn("Reply result code is %d '%s'. Error code is %d",
++                result, result_text[result <= max_result ?  result : 0], error);
++    if ((error > 0) && (error <= MAX_GENERAL_ERROR)){
++        if( result != PPTP_RESULT_GENERAL_ERROR )
++            warn("Result code is something else then \"general error\", "
++                    "so the following error is probably bogus.");
++        warn("Error is '%s', Error message: '%s'",
++                pptp_general_errors[error].name,
++                pptp_general_errors[error].desc);
++    }
++}
++
++static const char *ctrl_msg_types[] = {
++         "invalid control message type",
++/*         (Control Connection Management) */
++         "Start-Control-Connection-Request",            /* 1 */
++         "Start-Control-Connection-Reply",              /* 2 */
++         "Stop-Control-Connection-Request",             /* 3 */
++         "Stop-Control-Connection-Reply",               /* 4 */
++         "Echo-Request",                                /* 5 */
++         "Echo-Reply",                                  /* 6 */
++/*         (Call Management) */
++         "Outgoing-Call-Request",                       /* 7 */
++         "Outgoing-Call-Reply",                         /* 8 */
++         "Incoming-Call-Request",                       /* 9 */
++         "Incoming-Call-Reply",                        /* 10 */
++         "Incoming-Call-Connected",                    /* 11 */
++         "Call-Clear-Request",                         /* 12 */
++         "Call-Disconnect-Notify",                     /* 13 */
++/*         (Error Reporting) */
++         "WAN-Error-Notify",                           /* 14 */
++/*         (PPP Session Control) */
++         "Set-Link-Info"                              /* 15 */
++};
++#define MAX_CTRLMSG_TYPE 15
++
++/*** report a sent packet ****************************************************/
++static void ctrlp_rep( void * buffer, int size, int isbuff)
++{
++    struct pptp_header *packet = buffer;
++    unsigned int type;
++    if(size < sizeof(struct pptp_header)) return;
++    type = ntoh16(packet->ctrl_type);
++    /* FIXME: do not report sending echo requests as long as they are
++     * sent in a signal handler. This may dead lock as the syslog call
++     * is not reentrant */
++    if( type ==  PPTP_ECHO_RQST ) return;
++    /* don't keep reporting sending of echo's */
++    if( (type == PPTP_ECHO_RQST || type == PPTP_ECHO_RPLY) && nlogecho <= 0 ) return;
++    dbglog("%s control packet type is %d '%s'\n",isbuff ? "Buffered" : "Sent",
++            type, ctrl_msg_types[type <= MAX_CTRLMSG_TYPE ? type : 0]);
++
++}
++
++
++
++/* Open new pptp_connection.  Returns NULL on failure. */
++PPTP_CONN * pptp_conn_open(int inet_sock, int isclient, pptp_conn_cb callback)
++{
++    PPTP_CONN *conn;
++    /* Allocate structure */
++    if ((conn = malloc(sizeof(*conn))) == NULL) return NULL;
++    if ((conn->call = vector_create()) == NULL) { free(conn); return NULL; }
++    /* Initialize */
++    conn->inet_sock = inet_sock;
++    conn->conn_state = CONN_IDLE;
++    conn->ka_state  = KA_NONE;
++    conn->ka_id     = 1;
++    conn->call_serial_number = 0;
++    conn->callback  = callback;
++    /* Create I/O buffers */
++    conn->read_size = conn->write_size = 0;
++    conn->read_alloc = conn->write_alloc = INITIAL_BUFSIZE;
++    conn->read_buffer =
++        malloc(sizeof(*(conn->read_buffer)) * conn->read_alloc);
++    conn->write_buffer =
++        malloc(sizeof(*(conn->write_buffer)) * conn->write_alloc);
++    if (conn->read_buffer == NULL || conn->write_buffer == NULL) {
++        if (conn->read_buffer  != NULL) free(conn->read_buffer);
++        if (conn->write_buffer != NULL) free(conn->write_buffer);
++        vector_destroy(conn->call); free(conn); return NULL;
++    }
++    /* Make this socket non-blocking. */
++    fcntl(conn->inet_sock, F_SETFL, O_NONBLOCK);
++    /* Request connection from server, if this is a client */
++    if (isclient) {
++        struct pptp_start_ctrl_conn packet = {
++            PPTP_HEADER_CTRL(PPTP_START_CTRL_CONN_RQST),
++            hton16(PPTP_VERSION), 0, 0,
++            hton32(PPTP_FRAME_CAP), hton32(PPTP_BEARER_CAP),
++            hton16(PPTP_MAX_CHANNELS), hton16(PPTP_FIRMWARE_VERSION),
++            PPTP_HOSTNAME, PPTP_VENDOR
++        };
++        /* fix this packet, if necessary */
++        int idx, rc;
++        idx = get_quirk_index();
++        if (idx != -1 && pptp_fixups[idx].start_ctrl_conn) {
++            if ((rc = pptp_fixups[idx].start_ctrl_conn(&packet)))
++                warn("calling the start_ctrl_conn hook failed (%d)", rc);
++        }
++        if (pptp_send_ctrl_packet(conn, &packet, sizeof(packet)))
++            conn->conn_state = CONN_WAIT_CTL_REPLY;
++        else
++            return NULL; /* could not send initial start request. */
++    }
++    /* Set up interval/keep-alive timer */
++    /*   First, register handler for SIGALRM */
++    sigpipe_create();
++    sigpipe_assign(SIGALRM);
++    global.conn = conn;
++    /* Reset event timer */
++    pptp_reset_timer();
++    /* all done. */
++    return conn;
++}
++
++int pptp_conn_established(PPTP_CONN *conn) {
++  return (conn->conn_state == CONN_ESTABLISHED);
++}
++
++/* This currently *only* works for client call requests.
++ * We need to do something else to allocate calls for incoming requests.
++ */
++PPTP_CALL * pptp_call_open(PPTP_CONN * conn, int call_id,pptp_call_cb callback,
++        char *phonenr,int window)
++{
++    PPTP_CALL * call;
++    int idx, rc;
++    /* Send off the call request */
++    struct pptp_out_call_rqst packet = {
++        PPTP_HEADER_CTRL(PPTP_OUT_CALL_RQST),
++        0,0, /*call_id, sernum */
++        hton32(PPTP_BPS_MIN), hton32(PPTP_BPS_MAX),
++        hton32(PPTP_BEARER_CAP), hton32(PPTP_FRAME_CAP),
++        hton16(window), 0, 0, 0, {0}, {0}
++    };
++    assert(conn && conn->call);
++    assert(conn->conn_state == CONN_ESTABLISHED);
++    /* Assign call id */
++    if (!call_id && !vector_scan(conn->call, 0, PPTP_MAX_CHANNELS - 1, &call_id))
++        /* no more calls available! */
++        return NULL;
++    /* allocate structure. */
++    if ((call = malloc(sizeof(*call))) == NULL) return NULL;
++    /* Initialize call structure */
++    call->call_type = PPTP_CALL_PNS;
++    call->state.pns = PNS_IDLE;
++    call->call_id   = (u_int16_t) call_id;
++    call->sernum    = conn->call_serial_number++;
++    call->callback  = callback;
++    call->closure   = NULL;
++    packet.call_id = htons(call->call_id);
++    packet.call_sernum = htons(call->sernum);
++    /* if we have a quirk, build a new packet to fit it */
++    idx = get_quirk_index();
++    if (idx != -1 && pptp_fixups[idx].out_call_rqst_hook) {
++        if ((rc = pptp_fixups[idx].out_call_rqst_hook(&packet)))
++            warn("calling the out_call_rqst hook failed (%d)", rc);
++    }
++    /* fill in the phone number if it was specified */
++    if (phonenr) {
++        strncpy(packet.phone_num, phonenr, sizeof(packet.phone_num));
++        packet.phone_len = strlen(phonenr);
++        if( packet.phone_len > sizeof(packet.phone_num))
++            packet.phone_len = sizeof(packet.phone_num);
++        packet.phone_len = hton16 (packet.phone_len);
++    }
++    if (pptp_send_ctrl_packet(conn, &packet, sizeof(packet))) {
++        pptp_reset_timer();
++        call->state.pns = PNS_WAIT_REPLY;
++        /* and add it to the call vector */
++        vector_insert(conn->call, call_id, call);
++        return call;
++    } else { /* oops, unsuccessful. Deallocate. */
++        free(call);
++        return NULL;
++    }
++}
++
++/*** pptp_call_close **********************************************************/
++void pptp_call_close(PPTP_CONN * conn, PPTP_CALL * call)
++{
++    struct pptp_call_clear_rqst rqst = {
++        PPTP_HEADER_CTRL(PPTP_CALL_CLEAR_RQST), 0, 0
++    };
++    assert(conn && conn->call); assert(call);
++    assert(vector_contains(conn->call, call->call_id));
++    /* haven't thought about PAC yet */
++    assert(call->call_type == PPTP_CALL_PNS);
++    assert(call->state.pns != PNS_IDLE);
++    rqst.call_id = hton16(call->call_id);
++    /* don't check state against WAIT_DISCONNECT... allow multiple disconnect
++     * requests to be made.
++     */
++    pptp_send_ctrl_packet(conn, &rqst, sizeof(rqst));
++    pptp_reset_timer();
++    call->state.pns = PNS_WAIT_DISCONNECT;
++    /* call structure will be freed when we have confirmation of disconnect. */
++}
++
++/*** hard close ***************************************************************/
++void pptp_call_destroy(PPTP_CONN *conn, PPTP_CALL *call)
++{
++    assert(conn && conn->call); assert(call);
++    assert(vector_contains(conn->call, call->call_id));
++    /* notify */
++    if (call->callback != NULL) call->callback(conn, call, CALL_CLOSE_DONE);
++    /* deallocate */
++    vector_remove(conn->call, call->call_id);
++    free(call);
++}
++
++/*** this is a soft close *****************************************************/
++void pptp_conn_close(PPTP_CONN * conn, u_int8_t close_reason)
++{
++    struct pptp_stop_ctrl_conn rqst = {
++        PPTP_HEADER_CTRL(PPTP_STOP_CTRL_CONN_RQST),
++        hton8(close_reason), 0, 0
++    };
++    int i;
++    assert(conn && conn->call);
++    /* avoid repeated close attempts */
++    if (conn->conn_state == CONN_IDLE || conn->conn_state == CONN_WAIT_STOP_REPLY)
++        return;
++    /* close open calls, if any */
++    for (i = 0; i < vector_size(conn->call); i++)
++        pptp_call_close(conn, vector_get_Nth(conn->call, i));
++    /* now close connection */
++    info("Closing PPTP connection");
++    pptp_send_ctrl_packet(conn, &rqst, sizeof(rqst));
++    pptp_reset_timer(); /* wait 60 seconds for reply */
++    conn->conn_state = CONN_WAIT_STOP_REPLY;
++    return;
++}
++
++/*** this is a hard close *****************************************************/
++void pptp_conn_destroy(PPTP_CONN * conn)
++{
++    int i;
++    assert(conn != NULL); assert(conn->call != NULL);
++    /* destroy all open calls */
++    for (i = 0; i < vector_size(conn->call); i++)
++        pptp_call_destroy(conn, vector_get_Nth(conn->call, i));
++    /* notify */
++    if (conn->callback != NULL) conn->callback(conn, CONN_CLOSE_DONE);
++    sigpipe_close();
++    close(conn->inet_sock);
++    /* deallocate */
++    vector_destroy(conn->call);
++    free(conn);
++}
++
++/*** Deal with messages, in a non-blocking manner
++ * Add file descriptors used by pptp to fd_set.
++ */
++void pptp_fd_set(PPTP_CONN * conn, fd_set * read_set, fd_set * write_set,
++                 int * max_fd)
++{
++    assert(conn && conn->call);
++    /* Add fd to write_set if there are outstanding writes. */
++    if (conn->write_size > 0)
++        FD_SET(conn->inet_sock, write_set);
++    /* Always add fd to read_set. (always want something to read) */
++    FD_SET(conn->inet_sock, read_set);
++    if (*max_fd < conn->inet_sock) *max_fd = conn->inet_sock;
++    /* Add signal pipe file descriptor to set */
++    int sig_fd = sigpipe_fd();
++    FD_SET(sig_fd, read_set);
++    if (*max_fd < sig_fd) *max_fd = sig_fd;
++}
++
++/*** handle any pptp file descriptors set in fd_set, and clear them ***********/
++int pptp_dispatch(PPTP_CONN * conn, fd_set * read_set, fd_set * write_set)
++{
++    int r = 0;
++    assert(conn && conn->call);
++    /* Check for signals */
++    if (FD_ISSET(sigpipe_fd(), read_set)) {
++        if (sigpipe_read() == SIGALRM) pptp_handle_timer();
++	FD_CLR(sigpipe_fd(), read_set);
++    }
++    /* Check write_set could be set. */
++    if (FD_ISSET(conn->inet_sock, write_set)) {
++        FD_CLR(conn->inet_sock, write_set);
++        if (conn->write_size > 0)
++            r = pptp_write_some(conn);/* write as much as we can without blocking */
++    }
++    /* Check read_set */
++    if (r >= 0 && FD_ISSET(conn->inet_sock, read_set)) {
++        void *buffer; size_t size;
++        FD_CLR(conn->inet_sock, read_set);
++        r = pptp_read_some(conn); /* read as much as we can without blocking */
++	if (r < 0)
++	    return r;
++        /* make packets of the buffer, while we can. */
++        while (r >= 0 && pptp_make_packet(conn, &buffer, &size)) {
++            r = pptp_dispatch_packet(conn, buffer, size);
++            free(buffer);
++        }
++    }
++    /* That's all, folks.  Simple, eh? */
++    return r;
++}
++
++/*** Non-blocking write *******************************************************/
++int pptp_write_some(PPTP_CONN * conn) {
++    ssize_t retval;
++    assert(conn && conn->call);
++    retval = write(conn->inet_sock, conn->write_buffer, conn->write_size);
++    if (retval < 0) { /* error. */
++        if (errno == EAGAIN || errno == EINTR) {
++            return 0;
++        } else { /* a real error */
++            warn("write error: %s", strerror(errno));
++	    return -1;
++        }
++    }
++    assert(retval <= conn->write_size);
++    conn->write_size -= retval;
++    memmove(conn->write_buffer, conn->write_buffer + retval, conn->write_size);
++    ctrlp_rep(conn->write_buffer, retval, 0);
++    return 0;
++}
++
++/*** Non-blocking read ********************************************************/
++int pptp_read_some(PPTP_CONN * conn)
++{
++    ssize_t retval;
++    assert(conn && conn->call);
++    if (conn->read_size == conn->read_alloc) { /* need to alloc more memory */
++        char *new_buffer = realloc(conn->read_buffer,
++                sizeof(*(conn->read_buffer)) * conn->read_alloc * 2);
++        if (new_buffer == NULL) {
++            warn("Out of memory"); return -1;
++        }
++        conn->read_alloc *= 2;
++        conn->read_buffer = new_buffer;
++    }
++    retval = read(conn->inet_sock, conn->read_buffer + conn->read_size,
++            conn->read_alloc  - conn->read_size);
++    if (retval == 0) {
++        warn("read returned zero, peer has closed");
++        return -1;
++    }
++    if (retval < 0) {
++        if (errno == EINTR || errno == EAGAIN)
++	    return 0;
++        else { /* a real error */
++            warn("read error: %s", strerror(errno));
++            return -1;
++        }
++    }
++    conn->read_size += retval;
++    assert(conn->read_size <= conn->read_alloc);
++    return 0;
++}
++
++/*** Packet formation *********************************************************/
++int pptp_make_packet(PPTP_CONN * conn, void **buf, size_t *size)
++{
++    struct pptp_header *header;
++    size_t bad_bytes = 0;
++    assert(conn && conn->call); assert(buf != NULL); assert(size != NULL);
++    /* Give up unless there are at least sizeof(pptp_header) bytes */
++    while ((conn->read_size-bad_bytes) >= sizeof(struct pptp_header)) {
++        /* Throw out bytes until we have a valid header. */
++        header = (struct pptp_header *) (conn->read_buffer + bad_bytes);
++        if (ntoh32(header->magic) != PPTP_MAGIC) goto throwitout;
++        if (ntoh16(header->reserved0) != 0)
++            warn("reserved0 field is not zero! (0x%x) Cisco feature? \n",
++                    ntoh16(header->reserved0));
++        if (ntoh16(header->length) < sizeof(struct pptp_header)) goto throwitout;
++        if (ntoh16(header->length) > PPTP_CTRL_SIZE_MAX) goto throwitout;
++        /* well.  I guess it's good. Let's see if we've got it all. */
++        if (ntoh16(header->length) > (conn->read_size-bad_bytes))
++            /* nope.  Let's wait until we've got it, then. */
++            goto flushbadbytes;
++        /* One last check: */
++        if ((ntoh16(header->pptp_type) == PPTP_MESSAGE_CONTROL) &&
++                (ntoh16(header->length) !=
++                         PPTP_CTRL_SIZE(ntoh16(header->ctrl_type))))
++            goto throwitout;
++        /* well, I guess we've got it. */
++        *size = ntoh16(header->length);
++        *buf = malloc(*size);
++        if (*buf == NULL) { warn("Out of memory."); return 0; /* ack! */ }
++        memcpy(*buf, conn->read_buffer + bad_bytes, *size);
++        /* Delete this packet from the read_buffer. */
++        conn->read_size -= (bad_bytes + *size);
++        memmove(conn->read_buffer, conn->read_buffer + bad_bytes + *size,
++                conn->read_size);
++        if (bad_bytes > 0)
++            warn("%lu bad bytes thrown away.", (unsigned long) bad_bytes);
++        return 1;
++throwitout:
++        bad_bytes++;
++    }
++flushbadbytes:
++    /* no more packets.  Let's get rid of those bad bytes */
++    conn->read_size -= bad_bytes;
++    memmove(conn->read_buffer, conn->read_buffer + bad_bytes, conn->read_size);
++    if (bad_bytes > 0)
++        warn("%lu bad bytes thrown away.", (unsigned long) bad_bytes);
++    return 0;
++}
++
++/*** pptp_send_ctrl_packet ****************************************************/
++int pptp_send_ctrl_packet(PPTP_CONN * conn, void * buffer, size_t size)
++{
++    assert(conn && conn->call); assert(buffer);
++    if( conn->write_size > 0) pptp_write_some( conn);
++    if( conn->write_size == 0) {
++        ssize_t retval;
++        retval = write(conn->inet_sock, buffer, size);
++        if (retval < 0) { /* error. */
++            if (errno == EAGAIN || errno == EINTR) {
++                /* ignore */;
++                retval = 0;
++            } else { /* a real error */
++                warn("write error: %s", strerror(errno));
++                pptp_conn_destroy(conn); /* shut down fast. */
++                return 0;
++            }
++        }
++        ctrlp_rep( buffer, retval, 0);
++        size -= retval;
++        if( size <= 0) return 1;
++    }
++    /* Shove anything not written into the write buffer */
++    if (conn->write_size + size > conn->write_alloc) { /* need more memory */
++        char *new_buffer = realloc(conn->write_buffer,
++                sizeof(*(conn->write_buffer)) * conn->write_alloc * 2);
++        if (new_buffer == NULL) {
++            warn("Out of memory"); return 0;
++        }
++        conn->write_alloc *= 2;
++        conn->write_buffer = new_buffer;
++    }
++    memcpy(conn->write_buffer + conn->write_size, buffer, size);
++    conn->write_size += size;
++    ctrlp_rep( buffer,size,1);
++    return 1;
++}
++
++/*** Packet Dispatch **********************************************************/
++int pptp_dispatch_packet(PPTP_CONN * conn, void * buffer, size_t size)
++{
++    int r = 0;
++    struct pptp_header *header = (struct pptp_header *)buffer;
++    assert(conn && conn->call); assert(buffer);
++    assert(ntoh32(header->magic) == PPTP_MAGIC);
++    assert(ntoh16(header->length) == size);
++    switch (ntoh16(header->pptp_type)) {
++        case PPTP_MESSAGE_CONTROL:
++            r = ctrlp_disp(conn, buffer, size);
++            break;
++        case PPTP_MESSAGE_MANAGE:
++            /* MANAGEMENT messages aren't even part of the spec right now. */
++            dbglog("PPTP management message received, but not understood.");
++            break;
++        default:
++            dbglog("Unknown PPTP control message type received: %u",
++                    (unsigned int) ntoh16(header->pptp_type));
++            break;
++    }
++    return r;
++}
++
++/*** log echo request/replies *************************************************/
++static void logecho( int type)
++{
++    /* hack to stop flooding the log files (the most interesting part is right
++     * after the connection built-up) */
++    if( nlogecho > 0) {
++        dbglog("Echo Re%s received.", type == PPTP_ECHO_RQST ? "quest" :"ply");
++        if( --nlogecho == 0)
++            dbglog("no more Echo Reply/Request packets will be reported.");
++    }
++}
++
++/*** pptp_dispatch_ctrl_packet ************************************************/
++int ctrlp_disp(PPTP_CONN * conn, void * buffer, size_t size)
++{
++    struct pptp_header *header = (struct pptp_header *)buffer;
++    u_int8_t close_reason = PPTP_STOP_NONE;
++    assert(conn && conn->call); assert(buffer);
++    assert(ntoh32(header->magic) == PPTP_MAGIC);
++    assert(ntoh16(header->length) == size);
++    assert(ntoh16(header->pptp_type) == PPTP_MESSAGE_CONTROL);
++    if (size < PPTP_CTRL_SIZE(ntoh16(header->ctrl_type))) {
++        warn("Invalid packet received [type: %d; length: %d].",
++                (int) ntoh16(header->ctrl_type), (int) size);
++        return 0;
++    }
++    switch (ntoh16(header->ctrl_type)) {
++        /* ----------- STANDARD Start-Session MESSAGES ------------ */
++        case PPTP_START_CTRL_CONN_RQST:
++        {
++            struct pptp_start_ctrl_conn *packet =
++                (struct pptp_start_ctrl_conn *) buffer;
++            struct pptp_start_ctrl_conn reply = {
++                PPTP_HEADER_CTRL(PPTP_START_CTRL_CONN_RPLY),
++                hton16(PPTP_VERSION), 0, 0,
++                hton32(PPTP_FRAME_CAP), hton32(PPTP_BEARER_CAP),
++                hton16(PPTP_MAX_CHANNELS), hton16(PPTP_FIRMWARE_VERSION),
++                PPTP_HOSTNAME, PPTP_VENDOR };
++            int idx, rc;
++            dbglog("Received Start Control Connection Request");
++            /* fix this packet, if necessary */
++            idx = get_quirk_index();
++            if (idx != -1 && pptp_fixups[idx].start_ctrl_conn) {
++                if ((rc = pptp_fixups[idx].start_ctrl_conn(&reply)))
++                    warn("calling the start_ctrl_conn hook failed (%d)", rc);
++            }
++            if (conn->conn_state == CONN_IDLE) {
++                if (ntoh16(packet->version) < PPTP_VERSION) {
++                    /* Can't support this (earlier) PPTP_VERSION */
++                    reply.version = packet->version;
++                    /* protocol version not supported */
++                    reply.result_code = hton8(5);
++                    pptp_send_ctrl_packet(conn, &reply, sizeof(reply));
++                    pptp_reset_timer(); /* give sender a chance for a retry */
++                } else { /* same or greater version */
++                    if (pptp_send_ctrl_packet(conn, &reply, sizeof(reply))) {
++                        conn->conn_state = CONN_ESTABLISHED;
++                        dbglog("server connection ESTABLISHED.");
++                        pptp_reset_timer();
++                    }
++                }
++            }
++            break;
++        }
++        case PPTP_START_CTRL_CONN_RPLY:
++        {
++            struct pptp_start_ctrl_conn *packet =
++                (struct pptp_start_ctrl_conn *) buffer;
++            dbglog("Received Start Control Connection Reply");
++            if (conn->conn_state == CONN_WAIT_CTL_REPLY) {
++                /* XXX handle collision XXX [see rfc] */
++                if (ntoh16(packet->version) != PPTP_VERSION) {
++                    if (conn->callback != NULL)
++                        conn->callback(conn, CONN_OPEN_FAIL);
++                    close_reason = PPTP_STOP_PROTOCOL;
++                    goto pptp_conn_close;
++                }
++                if (ntoh8(packet->result_code) != 1 &&
++                    /* J'ai change le if () afin que la connection ne se ferme
++                     * pas pour un "rien" :p adel@cybercable.fr -
++                     *
++                     * Don't close the connection if the result code is zero
++                     * (feature found in certain ADSL modems)
++                     */
++                        ntoh8(packet->result_code) != 0) {
++                    dbglog("Negative reply received to our Start Control "
++                            "Connection Request");
++                    ctrlp_error(packet->result_code, packet->error_code,
++                            -1, pptp_start_ctrl_conn_rply,
++                            MAX_START_CTRL_CONN_REPLY);
++                    if (conn->callback != NULL)
++                        conn->callback(conn, CONN_OPEN_FAIL);
++                    close_reason = PPTP_STOP_PROTOCOL;
++                    goto pptp_conn_close;
++                }
++                conn->conn_state = CONN_ESTABLISHED;
++                /* log session properties */
++                conn->version      = ntoh16(packet->version);
++                conn->firmware_rev = ntoh16(packet->firmware_rev);
++                memcpy(conn->hostname, packet->hostname, sizeof(conn->hostname));
++                memcpy(conn->vendor, packet->vendor, sizeof(conn->vendor));
++                pptp_reset_timer(); /* 60 seconds until keep-alive */
++                dbglog("Client connection established.");
++                if (conn->callback != NULL)
++                    conn->callback(conn, CONN_OPEN_DONE);
++            } /* else goto pptp_conn_close; */
++            break;
++        }
++            /* ----------- STANDARD Stop-Session MESSAGES ------------ */
++        case PPTP_STOP_CTRL_CONN_RQST:
++        {
++            /* conn_state should be CONN_ESTABLISHED, but it could be
++             * something else */
++            struct pptp_stop_ctrl_conn reply = {
++                PPTP_HEADER_CTRL(PPTP_STOP_CTRL_CONN_RPLY),
++                hton8(1), hton8(PPTP_GENERAL_ERROR_NONE), 0
++            };
++            dbglog("Received Stop Control Connection Request.");
++            if (conn->conn_state == CONN_IDLE) break;
++            if (pptp_send_ctrl_packet(conn, &reply, sizeof(reply))) {
++                if (conn->callback != NULL)
++                    conn->callback(conn, CONN_CLOSE_RQST);
++                conn->conn_state = CONN_IDLE;
++		return -1;
++            }
++            break;
++        }
++        case PPTP_STOP_CTRL_CONN_RPLY:
++        {
++            dbglog("Received Stop Control Connection Reply.");
++            /* conn_state should be CONN_WAIT_STOP_REPLY, but it
++             * could be something else */
++            if (conn->conn_state == CONN_IDLE) break;
++            conn->conn_state = CONN_IDLE;
++	    return -1;
++        }
++            /* ----------- STANDARD Echo/Keepalive MESSAGES ------------ */
++        case PPTP_ECHO_RPLY:
++        {
++            struct pptp_echo_rply *packet =
++                (struct pptp_echo_rply *) buffer;
++            logecho( PPTP_ECHO_RPLY);
++            if ((conn->ka_state == KA_OUTSTANDING) &&
++                    (ntoh32(packet->identifier) == conn->ka_id)) {
++                conn->ka_id++;
++                conn->ka_state = KA_NONE;
++                pptp_reset_timer();
++            }
++            break;
++        }
++        case PPTP_ECHO_RQST:
++        {
++            struct pptp_echo_rqst *packet =
++                (struct pptp_echo_rqst *) buffer;
++            struct pptp_echo_rply reply = {
++                PPTP_HEADER_CTRL(PPTP_ECHO_RPLY),
++                packet->identifier, /* skip hton32(ntoh32(id)) */
++                hton8(1), hton8(PPTP_GENERAL_ERROR_NONE), 0
++            };
++            logecho( PPTP_ECHO_RQST);
++            pptp_send_ctrl_packet(conn, &reply, sizeof(reply));
++            pptp_reset_timer();
++            break;
++        }
++            /* ----------- OUTGOING CALL MESSAGES ------------ */
++        case PPTP_OUT_CALL_RQST:
++        {
++            struct pptp_out_call_rqst *packet =
++                (struct pptp_out_call_rqst *)buffer;
++            struct pptp_out_call_rply reply = {
++                PPTP_HEADER_CTRL(PPTP_OUT_CALL_RPLY),
++                0 /* callid */, packet->call_id, 1, PPTP_GENERAL_ERROR_NONE, 0,
++                hton32(PPTP_CONNECT_SPEED),
++                hton16(PPTP_WINDOW), hton16(PPTP_DELAY), 0
++            };
++            dbglog("Received Outgoing Call Request.");
++            /* XXX PAC: eventually this should make an outgoing call. XXX */
++            reply.result_code = hton8(7); /* outgoing calls verboten */
++            pptp_send_ctrl_packet(conn, &reply, sizeof(reply));
++            break;
++        }
++        case PPTP_OUT_CALL_RPLY:
++        {
++            struct pptp_out_call_rply *packet =
++                (struct pptp_out_call_rply *)buffer;
++            PPTP_CALL * call;
++            u_int16_t callid = ntoh16(packet->call_id_peer);
++            dbglog("Received Outgoing Call Reply.");
++            if (!vector_search(conn->call, (int) callid, &call)) {
++                dbglog("PPTP_OUT_CALL_RPLY received for non-existant call: "
++                        "peer call ID (us)  %d call ID (them) %d.",
++                        callid, ntoh16(packet->call_id));
++                break;
++            }
++            if (call->call_type != PPTP_CALL_PNS) {
++                dbglog("Ack!  How did this call_type get here?"); /* XXX? */
++                break;
++            }
++            if (call->state.pns != PNS_WAIT_REPLY) {
++                warn("Unexpected(?) Outgoing Call Reply will be ignored.");
++                break;
++            }
++            /* check for errors */
++            if (packet->result_code != 1) {
++                /* An error.  Log it verbosely. */
++                dbglog("Our outgoing call request [callid %d] has not been "
++                        "accepted.", (int) callid);
++                ctrlp_error(packet->result_code, packet->error_code,
++                        packet->cause_code, pptp_out_call_reply_result,
++                        MAX_OUT_CALL_REPLY_RESULT);
++                call->state.pns = PNS_IDLE;
++                if (call->callback != NULL)
++                    call->callback(conn, call, CALL_OPEN_FAIL);
++                pptp_call_destroy(conn, call);
++            } else {
++                /* connection established */
++                call->state.pns = PNS_ESTABLISHED;
++                call->peer_call_id = ntoh16(packet->call_id);
++                call->speed        = ntoh32(packet->speed);
++                pptp_reset_timer();
++                /* call pptp_set_link. unless the user specified a quirk
++                   and this quirk has a set_link hook, this is a noop */
++                pptp_set_link(conn, call->peer_call_id);
++                if (call->callback != NULL)
++                    call->callback(conn, call, CALL_OPEN_DONE);
++                dbglog("Outgoing call established (call ID %u, peer's "
++                        "call ID %u).\n", call->call_id, call->peer_call_id);
++            }
++            break;
++        }
++            /* ----------- INCOMING CALL MESSAGES ------------ */
++            /* XXX write me XXX */
++            /* ----------- CALL CONTROL MESSAGES ------------ */
++        case PPTP_CALL_CLEAR_RQST:
++        {
++            struct pptp_call_clear_rqst *packet =
++                (struct pptp_call_clear_rqst *)buffer;
++            struct pptp_call_clear_ntfy reply = {
++                PPTP_HEADER_CTRL(PPTP_CALL_CLEAR_NTFY), packet->call_id,
++                1, PPTP_GENERAL_ERROR_NONE, 0, 0, {0}
++            };
++            dbglog("Received Call Clear Request.");
++            if (vector_contains(conn->call, ntoh16(packet->call_id))) {
++                PPTP_CALL * call;
++                vector_search(conn->call, ntoh16(packet->call_id), &call);
++                if (call->callback != NULL)
++                    call->callback(conn, call, CALL_CLOSE_RQST);
++                pptp_send_ctrl_packet(conn, &reply, sizeof(reply));
++                pptp_call_destroy(conn, call);
++                dbglog("Call closed (RQST) (call id %d)", (int) call->call_id);
++            }
++            break;
++        }
++        case PPTP_CALL_CLEAR_NTFY:
++        {
++            struct pptp_call_clear_ntfy *packet =
++                (struct pptp_call_clear_ntfy *)buffer;
++            dbglog("Call disconnect notification received (call id %d)",
++                    ntoh16(packet->call_id));
++            if (vector_contains(conn->call, ntoh16(packet->call_id))) {
++                PPTP_CALL * call;
++                ctrlp_error(packet->result_code, packet->error_code,
++                        packet->cause_code, pptp_call_disc_ntfy,
++                        MAX_CALL_DISC_NTFY);
++                vector_search(conn->call, ntoh16(packet->call_id), &call);
++                pptp_call_destroy(conn, call);
++            }
++            /* XXX we could log call stats here XXX */
++            /* XXX not all servers send this XXX */
++            break;
++        }
++        case PPTP_SET_LINK_INFO:
++        {
++            /* I HAVE NO CLUE WHAT TO DO IF send_accm IS NOT 0! */
++            /* this is really dealt with in the HDLC deencapsulation, anyway. */
++            struct pptp_set_link_info *packet =
++                (struct pptp_set_link_info *)buffer;
++            /* log it. */
++            dbglog("PPTP_SET_LINK_INFO received from peer_callid %u",
++                    (unsigned int) ntoh16(packet->call_id_peer));
++            dbglog("  send_accm is %08lX, recv_accm is %08lX",
++                    (unsigned long) ntoh32(packet->send_accm),
++                    (unsigned long) ntoh32(packet->recv_accm));
++            if (!(ntoh32(packet->send_accm) == 0 &&
++                    ntoh32(packet->recv_accm) == 0))
++                warn("Non-zero Async Control Character Maps are not supported!");
++            break;
++        }
++        default:
++            dbglog("Unrecognized Packet %d received.",
++                    (int) ntoh16(((struct pptp_header *)buffer)->ctrl_type));
++            /* goto pptp_conn_close; */
++            break;
++    }
++    return 0;
++pptp_conn_close:
++    warn("pptp_conn_close(%d)", (int) close_reason);
++    pptp_conn_close(conn, close_reason);
++    return 0;
++}
++
++/*** pptp_set_link **************************************************************/
++void pptp_set_link(PPTP_CONN* conn, int peer_call_id)
++{
++    int idx, rc;
++    /* if we need to send a set_link packet because of buggy
++       hardware or pptp server, do it now */
++    if ((idx = get_quirk_index()) != -1 && pptp_fixups[idx].set_link_hook) {
++        struct pptp_set_link_info packet;
++        if ((rc = pptp_fixups[idx].set_link_hook(&packet, peer_call_id)))
++            warn("calling the set_link hook failed (%d)", rc);
++        if (pptp_send_ctrl_packet(conn, &packet, sizeof(packet))) {
++            pptp_reset_timer();
++        }
++    }
++}
++
++/*** Get info from call structure *********************************************/
++/* NOTE: The peer_call_id is undefined until we get a server response. */
++void pptp_call_get_ids(PPTP_CONN * conn, PPTP_CALL * call,
++		       u_int16_t * call_id, u_int16_t * peer_call_id)
++{
++    assert(conn != NULL); assert(call != NULL);
++    *call_id = call->call_id;
++    *peer_call_id = call->peer_call_id;
++}
++
++/*** pptp_call_closure_put ****************************************************/
++void   pptp_call_closure_put(PPTP_CONN * conn, PPTP_CALL * call, void *cl)
++{
++    assert(conn != NULL); assert(call != NULL);
++    call->closure = cl;
++}
++
++/*** pptp_call_closure_get ****************************************************/
++void * pptp_call_closure_get(PPTP_CONN * conn, PPTP_CALL * call)
++{
++    assert(conn != NULL); assert(call != NULL);
++    return call->closure;
++}
++
++/*** pptp_conn_closure_put ****************************************************/
++void   pptp_conn_closure_put(PPTP_CONN * conn, void *cl)
++{
++    assert(conn != NULL);
++    conn->closure = cl;
++}
++
++/*** pptp_conn_closure_get ****************************************************/
++void * pptp_conn_closure_get(PPTP_CONN * conn)
++{
++    assert(conn != NULL);
++    return conn->closure;
++}
++
++/*** Reset keep-alive timer ***************************************************/
++static void pptp_reset_timer(void)
++{
++    const struct itimerval tv = { {  0, 0 },   /* stop on time-out */
++        { idle_wait, 0 } };
++    if (idle_wait) setitimer(ITIMER_REAL, &tv, NULL);
++}
++
++
++/*** Handle keep-alive timer **************************************************/
++static void pptp_handle_timer()
++{
++    int i;
++    /* "Keep Alives and Timers, 1": check connection state */
++    if (global.conn->conn_state != CONN_ESTABLISHED) {
++        if (global.conn->conn_state == CONN_WAIT_STOP_REPLY)
++            /* hard close. */
++            pptp_conn_destroy(global.conn);
++        else /* soft close */
++            pptp_conn_close(global.conn, PPTP_STOP_NONE);
++    }
++    /* "Keep Alives and Timers, 2": check echo status */
++    if (global.conn->ka_state == KA_OUTSTANDING) {
++        /* no response to keep-alive */
++        info("closing control connection due to missing echo reply");
++	pptp_conn_close(global.conn, PPTP_STOP_NONE);
++    } else { /* ka_state == NONE */ /* send keep-alive */
++        struct pptp_echo_rqst rqst = {
++            PPTP_HEADER_CTRL(PPTP_ECHO_RQST), hton32(global.conn->ka_id) };
++        pptp_send_ctrl_packet(global.conn, &rqst, sizeof(rqst));
++        global.conn->ka_state = KA_OUTSTANDING;
++    }
++    /* check incoming/outgoing call states for !IDLE && !ESTABLISHED */
++    for (i = 0; i < vector_size(global.conn->call); i++) {
++        PPTP_CALL * call = vector_get_Nth(global.conn->call, i);
++        if (call->call_type == PPTP_CALL_PNS) {
++            if (call->state.pns == PNS_WAIT_REPLY) {
++                /* send close request */
++                pptp_call_close(global.conn, call);
++                assert(call->state.pns == PNS_WAIT_DISCONNECT);
++            } else if (call->state.pns == PNS_WAIT_DISCONNECT) {
++                /* hard-close the call */
++                pptp_call_destroy(global.conn, call);
++            }
++        } else if (call->call_type == PPTP_CALL_PAC) {
++            if (call->state.pac == PAC_WAIT_REPLY) {
++                /* XXX FIXME -- drop the PAC connection XXX */
++            } else if (call->state.pac == PAC_WAIT_CS_ANS) {
++                /* XXX FIXME -- drop the PAC connection XXX */
++            }
++        }
++    }
++    pptp_reset_timer();
++}
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_ctrl.h
+@@ -0,0 +1,57 @@
++/* pptp_ctrl.h ... handle PPTP control connection.
++ *                 C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: pptp_ctrl.h,v 1.5 2004/11/09 01:42:32 quozl Exp $
++ */
++
++#ifndef INC_PPTP_CTRL_H
++#define INC_PPTP_CTRL_H
++#include <sys/types.h>
++
++typedef struct PPTP_CONN PPTP_CONN;
++typedef struct PPTP_CALL PPTP_CALL;
++
++enum call_state { CALL_OPEN_RQST,  CALL_OPEN_DONE, CALL_OPEN_FAIL,
++		  CALL_CLOSE_RQST, CALL_CLOSE_DONE };
++enum conn_state { CONN_OPEN_RQST,  CONN_OPEN_DONE, CONN_OPEN_FAIL,
++		  CONN_CLOSE_RQST, CONN_CLOSE_DONE };
++
++typedef void (*pptp_call_cb)(PPTP_CONN*, PPTP_CALL*, enum call_state);
++typedef void (*pptp_conn_cb)(PPTP_CONN*, enum conn_state);
++
++/* if 'isclient' is true, then will send 'conn open' packet to other host.
++ * not necessary if this is being opened by a server process after
++ * receiving a conn_open packet from client.
++ */
++PPTP_CONN * pptp_conn_open(int inet_sock, int isclient,
++			   pptp_conn_cb callback);
++PPTP_CALL * pptp_call_open(PPTP_CONN * conn, int call_id,
++			   pptp_call_cb callback, char *phonenr,int window);
++int pptp_conn_established(PPTP_CONN * conn);
++/* soft close.  Will callback on completion. */
++void pptp_call_close(PPTP_CONN * conn, PPTP_CALL * call);
++/* hard close. */
++void pptp_call_destroy(PPTP_CONN *conn, PPTP_CALL *call);
++/* soft close.  Will callback on completion. */
++void pptp_conn_close(PPTP_CONN * conn, u_int8_t close_reason);
++/* hard close */
++void pptp_conn_destroy(PPTP_CONN * conn);
++
++/* Add file descriptors used by pptp to fd_set. */
++void pptp_fd_set(PPTP_CONN * conn, fd_set * read_set, fd_set * write_set, int *max_fd);
++/* handle any pptp file descriptors set in fd_set, and clear them */
++int pptp_dispatch(PPTP_CONN * conn, fd_set * read_set, fd_set * write_set);
++
++/* Get info about connection, call */
++void pptp_call_get_ids(PPTP_CONN * conn, PPTP_CALL * call,
++		       u_int16_t * call_id, u_int16_t * peer_call_id);
++/* Arbitrary user data about this call/connection.
++ * It is the caller's responsibility to free this data before calling
++ * pptp_call|conn_close()
++ */
++void * pptp_conn_closure_get(PPTP_CONN * conn);
++void   pptp_conn_closure_put(PPTP_CONN * conn, void *cl);
++void * pptp_call_closure_get(PPTP_CONN * conn, PPTP_CALL * call);
++void   pptp_call_closure_put(PPTP_CONN * conn, PPTP_CALL * call, void *cl);
++
++#endif /* INC_PPTP_CTRL_H */
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_msg.h
+@@ -0,0 +1,303 @@
++/*  pptp.h:  packet structures and magic constants for the PPTP protocol 
++ *           C. Scott Ananian <cananian@alumni.princeton.edu>            
++ *
++ * $Id: pptp_msg.h,v 1.3 2003/02/15 10:37:21 quozl Exp $
++ */
++
++#ifndef INC_PPTP_H
++#define INC_PPTP_H
++
++/* Grab definitions of int16, int32, etc. */
++#include <sys/types.h>
++/* define "portable" htons, etc. */
++#define hton8(x)  (x)
++#define ntoh8(x)  (x)
++#define hton16(x) htons(x)
++#define ntoh16(x) ntohs(x)
++#define hton32(x) htonl(x)
++#define ntoh32(x) ntohl(x)
++
++/* PPTP magic numbers: ----------------------------------------- */
++
++#define PPTP_MAGIC 0x1A2B3C4D /* Magic cookie for PPTP datagrams */
++#define PPTP_PORT  1723       /* PPTP TCP port number            */
++#define PPTP_PROTO 47         /* PPTP IP protocol number         */
++
++/* Control Connection Message Types: --------------------------- */
++
++#define PPTP_MESSAGE_CONTROL		1
++#define PPTP_MESSAGE_MANAGE		2
++
++/* Control Message Types: -------------------------------------- */
++
++/* (Control Connection Management) */
++#define PPTP_START_CTRL_CONN_RQST	1
++#define PPTP_START_CTRL_CONN_RPLY	2
++#define PPTP_STOP_CTRL_CONN_RQST	3
++#define PPTP_STOP_CTRL_CONN_RPLY	4
++#define PPTP_ECHO_RQST			5
++#define PPTP_ECHO_RPLY			6
++
++/* (Call Management) */
++#define PPTP_OUT_CALL_RQST		7
++#define PPTP_OUT_CALL_RPLY		8
++#define PPTP_IN_CALL_RQST		9
++#define PPTP_IN_CALL_RPLY		10
++#define PPTP_IN_CALL_CONNECT		11
++#define PPTP_CALL_CLEAR_RQST		12
++#define PPTP_CALL_CLEAR_NTFY		13
++
++/* (Error Reporting) */
++#define PPTP_WAN_ERR_NTFY		14
++
++/* (PPP Session Control) */
++#define PPTP_SET_LINK_INFO		15
++
++/* PPTP version information: --------------------------------------*/
++#define PPTP_VERSION_STRING	"1.00"
++#define PPTP_VERSION		0x100
++#define PPTP_FIRMWARE_STRING	"0.01"
++#define PPTP_FIRMWARE_VERSION	0x001
++
++/* PPTP capabilities: ---------------------------------------------*/
++
++/* (Framing capabilities for msg sender) */
++#define PPTP_FRAME_ASYNC	1
++#define PPTP_FRAME_SYNC		2
++#define PPTP_FRAME_ANY          3
++
++/* (Bearer capabilities for msg sender) */
++#define PPTP_BEARER_ANALOG	1
++#define PPTP_BEARER_DIGITAL 	2
++#define PPTP_BEARER_ANY		3
++
++#define PPTP_RESULT_GENERAL_ERROR 2
++
++/* (Reasons to close a connection) */
++#define PPTP_STOP_NONE		  1 /* no good reason                        */
++#define PPTP_STOP_PROTOCOL	  2 /* can't support peer's protocol version */
++#define PPTP_STOP_LOCAL_SHUTDOWN  3 /* requester is being shut down          */
++
++/* PPTP datagram structures (all data in network byte order): ----------*/
++
++struct pptp_header {
++  u_int16_t length;	  /* message length in octets, including header */
++  u_int16_t pptp_type;	  /* PPTP message type. 1 for control message.  */
++  u_int32_t magic;	  /* this should be PPTP_MAGIC.                 */
++  u_int16_t ctrl_type;	  /* Control message type (0-15)                */
++  u_int16_t reserved0;	  /* reserved.  MUST BE ZERO.                   */
++};
++
++struct pptp_start_ctrl_conn { /* for control message types 1 and 2 */
++  struct pptp_header header;
++
++  u_int16_t version;      /* PPTP protocol version.  = PPTP_VERSION     */
++  u_int8_t  result_code;  /* these two fields should be zero on rqst msg*/
++  u_int8_t  error_code;   /* 0 unless result_code==2 (General Error)    */
++  u_int32_t framing_cap;  /* Framing capabilities                       */
++  u_int32_t bearer_cap;   /* Bearer Capabilities                        */
++  u_int16_t max_channels; /* Maximum Channels (=0 for PNS, PAC ignores) */
++  u_int16_t firmware_rev; /* Firmware or Software Revision              */
++  u_int8_t  hostname[64]; /* Host Name (64 octets, zero terminated)     */
++  u_int8_t  vendor[64];   /* Vendor string (64 octets, zero term.)      */
++  /* MS says that end of hostname/vendor fields should be filled with   */
++  /* octets of value 0, but Win95 PPTP driver doesn't do this.          */
++};
++
++struct pptp_stop_ctrl_conn { /* for control message types 3 and 4 */
++  struct pptp_header header;
++
++  u_int8_t reason_result; /* reason for rqst, result for rply          */
++  u_int8_t error_code;	  /* MUST be 0, unless rply result==2 (general err)*/
++  u_int16_t reserved1;    /* MUST be 0                                */
++};
++
++struct pptp_echo_rqst { /* for control message type 5 */
++  struct pptp_header header;
++  u_int32_t identifier;   /* arbitrary value set by sender which is used */
++                          /* to match up reply and request               */
++};
++
++struct pptp_echo_rply { /* for control message type 6 */
++  struct pptp_header header;
++  u_int32_t identifier;	  /* should correspond to id of rqst             */
++  u_int8_t result_code;
++  u_int8_t error_code;    /* =0, unless result_code==2 (general error)   */
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++};
++
++struct pptp_out_call_rqst { /* for control message type 7 */
++  struct pptp_header header;
++  u_int16_t call_id;	  /* Call ID (unique id used to multiplex data)  */
++  u_int16_t call_sernum;  /* Call Serial Number (used for logging)       */
++  u_int32_t bps_min;      /* Minimum BPS (lowest acceptable line speed)  */
++  u_int32_t bps_max;	  /* Maximum BPS (highest acceptable line speed) */
++  u_int32_t bearer;	  /* Bearer type                                 */
++  u_int32_t framing;      /* Framing type                                */
++  u_int16_t recv_size;	  /* Recv. Window Size (no. of buffered packets) */
++  u_int16_t delay;	  /* Packet Processing Delay (in 1/10 sec)       */
++  u_int16_t phone_len;	  /* Phone Number Length (num. of valid digits)  */
++  u_int16_t reserved1;    /* MUST BE ZERO				 */
++  u_int8_t  phone_num[64]; /* Phone Number (64 octets, null term.)       */
++  u_int8_t subaddress[64]; /* Subaddress (64 octets, null term.)         */
++};
++
++struct pptp_out_call_rply { /* for control message type 8 */
++  struct pptp_header header;
++  u_int16_t call_id;      /* Call ID (used to multiplex data over tunnel)*/
++  u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
++  u_int8_t  result_code;  /* Result Code (1 is no errors)                */
++  u_int8_t  error_code;   /* Error Code (=0 unless result_code==2)       */
++  u_int16_t cause_code;   /* Cause Code (addt'l failure information)     */
++  u_int32_t speed;        /* Connect Speed (in BPS)                      */
++  u_int16_t recv_size;    /* Recv. Window Size (no. of buffered packets) */
++  u_int16_t delay;	  /* Packet Processing Delay (in 1/10 sec)       */
++  u_int32_t channel;      /* Physical Channel ID (for logging)           */
++};
++
++struct pptp_in_call_rqst { /* for control message type 9 */
++  struct pptp_header header;
++  u_int16_t call_id;	  /* Call ID (unique id used to multiplex data)  */
++  u_int16_t call_sernum;  /* Call Serial Number (used for logging)       */
++  u_int32_t bearer;	  /* Bearer type                                 */
++  u_int32_t channel;      /* Physical Channel ID (for logging)           */
++  u_int16_t dialed_len;   /* Dialed Number Length (# of valid digits)    */
++  u_int16_t dialing_len;  /* Dialing Number Length (# of valid digits)   */
++  u_int8_t dialed_num[64]; /* Dialed Number (64 octets, zero term.)      */
++  u_int8_t dialing_num[64]; /* Dialing Number (64 octets, zero term.)    */
++  u_int8_t subaddress[64];  /* Subaddress (64 octets, zero term.)        */
++};
++
++struct pptp_in_call_rply { /* for control message type 10 */
++  struct pptp_header header;
++  u_int16_t call_id;      /* Call ID (used to multiplex data over tunnel)*/
++  u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
++  u_int8_t  result_code;  /* Result Code (1 is no errors)                */
++  u_int8_t  error_code;   /* Error Code (=0 unless result_code==2)       */
++  u_int16_t recv_size;    /* Recv. Window Size (no. of buffered packets) */
++  u_int16_t delay;	  /* Packet Processing Delay (in 1/10 sec)       */
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++};
++
++struct pptp_in_call_connect { /* for control message type 11 */
++  struct pptp_header header;
++  u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++  u_int32_t speed;        /* Connect Speed (in BPS)                      */
++  u_int16_t recv_size;    /* Recv. Window Size (no. of buffered packets) */
++  u_int16_t delay;	  /* Packet Processing Delay (in 1/10 sec)       */
++  u_int32_t framing;      /* Framing type                                */
++};
++
++struct pptp_call_clear_rqst { /* for control message type 12 */
++  struct pptp_header header;
++  u_int16_t call_id;      /* Call ID (used to multiplex data over tunnel)*/
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++};
++
++struct pptp_call_clear_ntfy { /* for control message type 13 */
++  struct pptp_header header;
++  u_int16_t call_id;      /* Call ID (used to multiplex data over tunnel)*/
++  u_int8_t  result_code;  /* Result Code                                 */
++  u_int8_t  error_code;   /* Error Code (=0 unless result_code==2)       */
++  u_int16_t cause_code;   /* Cause Code (for ISDN, is Q.931 cause code)  */
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++  u_int8_t call_stats[128]; /* Call Statistics: 128 octets, ascii, 0-term */
++};
++
++struct pptp_wan_err_ntfy {    /* for control message type 14 */
++  struct pptp_header header;
++  u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
++  u_int16_t reserved1;    /* MUST BE ZERO                                */
++  u_int32_t crc_errors;   /* CRC errors 				 */
++  u_int32_t frame_errors; /* Framing errors 				 */
++  u_int32_t hard_errors;  /* Hardware overruns 				 */
++  u_int32_t buff_errors;  /* Buffer overruns				 */
++  u_int32_t time_errors;  /* Time-out errors				 */
++  u_int32_t align_errors; /* Alignment errors				 */
++};
++
++struct pptp_set_link_info {   /* for control message type 15 */
++  struct pptp_header header;
++  u_int16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst) */
++  u_int16_t reserved1;    /* MUST BE ZERO                                   */
++  u_int32_t send_accm;    /* Send ACCM (for PPP packets; default 0xFFFFFFFF)*/
++  u_int32_t recv_accm;    /* Receive ACCM (for PPP pack.;default 0xFFFFFFFF)*/
++};
++
++/* helpful #defines: -------------------------------------------- */
++#define pptp_isvalid_ctrl(header, type, length) \
++ (!( ( ntoh16(((struct pptp_header *)header)->length)    < (length)  ) ||   \
++     ( ntoh16(((struct pptp_header *)header)->pptp_type) !=(type)    ) ||   \
++     ( ntoh32(((struct pptp_header *)header)->magic)     !=PPTP_MAGIC) ||   \
++     ( ntoh16(((struct pptp_header *)header)->ctrl_type) > PPTP_SET_LINK_INFO) || \
++     ( ntoh16(((struct pptp_header *)header)->reserved0) !=0         ) ))
++
++#define PPTP_HEADER_CTRL(type)  \
++{ hton16(PPTP_CTRL_SIZE(type)), \
++  hton16(PPTP_MESSAGE_CONTROL), \
++  hton32(PPTP_MAGIC),           \
++  hton16(type), 0 }             
++
++#define PPTP_CTRL_SIZE(type) ( \
++(type==PPTP_START_CTRL_CONN_RQST)?sizeof(struct pptp_start_ctrl_conn):	\
++(type==PPTP_START_CTRL_CONN_RPLY)?sizeof(struct pptp_start_ctrl_conn):	\
++(type==PPTP_STOP_CTRL_CONN_RQST )?sizeof(struct pptp_stop_ctrl_conn):	\
++(type==PPTP_STOP_CTRL_CONN_RPLY )?sizeof(struct pptp_stop_ctrl_conn):	\
++(type==PPTP_ECHO_RQST           )?sizeof(struct pptp_echo_rqst):	\
++(type==PPTP_ECHO_RPLY           )?sizeof(struct pptp_echo_rply):	\
++(type==PPTP_OUT_CALL_RQST       )?sizeof(struct pptp_out_call_rqst):	\
++(type==PPTP_OUT_CALL_RPLY       )?sizeof(struct pptp_out_call_rply):	\
++(type==PPTP_IN_CALL_RQST        )?sizeof(struct pptp_in_call_rqst):	\
++(type==PPTP_IN_CALL_RPLY        )?sizeof(struct pptp_in_call_rply):	\
++(type==PPTP_IN_CALL_CONNECT     )?sizeof(struct pptp_in_call_connect):	\
++(type==PPTP_CALL_CLEAR_RQST     )?sizeof(struct pptp_call_clear_rqst):	\
++(type==PPTP_CALL_CLEAR_NTFY     )?sizeof(struct pptp_call_clear_ntfy):	\
++(type==PPTP_WAN_ERR_NTFY        )?sizeof(struct pptp_wan_err_ntfy):	\
++(type==PPTP_SET_LINK_INFO       )?sizeof(struct pptp_set_link_info):	\
++0)
++#define max(a,b) (((a)>(b))?(a):(b))
++#define PPTP_CTRL_SIZE_MAX (			\
++max(sizeof(struct pptp_start_ctrl_conn),	\
++max(sizeof(struct pptp_echo_rqst),		\
++max(sizeof(struct pptp_echo_rply),		\
++max(sizeof(struct pptp_out_call_rqst),		\
++max(sizeof(struct pptp_out_call_rply),		\
++max(sizeof(struct pptp_in_call_rqst),		\
++max(sizeof(struct pptp_in_call_rply),		\
++max(sizeof(struct pptp_in_call_connect),	\
++max(sizeof(struct pptp_call_clear_rqst),	\
++max(sizeof(struct pptp_call_clear_ntfy),	\
++max(sizeof(struct pptp_wan_err_ntfy),		\
++max(sizeof(struct pptp_set_link_info), 0)))))))))))))
++
++
++/* gre header structure: -------------------------------------------- */
++
++#define PPTP_GRE_PROTO  0x880B
++#define PPTP_GRE_VER    0x1
++
++#define PPTP_GRE_FLAG_C	0x80
++#define PPTP_GRE_FLAG_R	0x40
++#define PPTP_GRE_FLAG_K	0x20
++#define PPTP_GRE_FLAG_S	0x10
++#define PPTP_GRE_FLAG_A	0x80
++
++#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
++#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
++#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
++#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
++#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
++
++struct pptp_gre_header {
++  u_int8_t flags;		/* bitfield */
++  u_int8_t ver;			/* should be PPTP_GRE_VER (enhanced GRE) */
++  u_int16_t protocol;		/* should be PPTP_GRE_PROTO (ppp-encaps) */
++  u_int16_t payload_len;	/* size of ppp payload, not inc. gre header */
++  u_int16_t call_id;		/* peer's call_id for this session */
++  u_int32_t seq;		/* sequence number.  Present if S==1 */
++  u_int32_t ack;		/* seq number of highest packet recieved by */
++  				/*  sender in this session */
++};
++
++#endif /* INC_PPTP_H */
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_options.h
+@@ -0,0 +1,41 @@
++/* pptp_options.h ...... various constants used in the PPTP protocol.
++ *                       #define STANDARD to emulate NT 4.0 exactly.
++ *                       C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: pptp_options.h,v 1.3 2004/11/09 01:42:32 quozl Exp $
++ */
++
++#ifndef INC_PPTP_OPTIONS_H
++#define INC_PPTP_OPTIONS_H
++
++#undef  PPTP_FIRMWARE_STRING
++#undef  PPTP_FIRMWARE_VERSION
++#define PPTP_BUF_MAX 65536
++#define PPTP_TIMEOUT 60 /* seconds */
++extern int idle_wait;
++extern int max_echo_wait;
++#define PPTP_CONNECT_SPEED 1000000000
++#define PPTP_WINDOW 3
++#define PPTP_DELAY  0
++#define PPTP_BPS_MIN 2400
++#define PPTP_BPS_MAX 1000000000
++
++#ifndef STANDARD
++#define PPTP_MAX_CHANNELS 65535
++#define PPTP_FIRMWARE_STRING "0.01"
++#define PPTP_FIRMWARE_VERSION 0x001
++#define PPTP_HOSTNAME {'l','o','c','a','l',0}
++#define PPTP_VENDOR   {'c','a','n','a','n','i','a','n',0}
++#define PPTP_FRAME_CAP  PPTP_FRAME_ANY
++#define PPTP_BEARER_CAP PPTP_BEARER_ANY
++#else
++#define PPTP_MAX_CHANNELS 5
++#define PPTP_FIRMWARE_STRING "0.01"
++#define PPTP_FIRMWARE_VERSION 0
++#define PPTP_HOSTNAME {'l','o','c','a','l',0}
++#define PPTP_VENDOR   {'N','T',0}
++#define PPTP_FRAME_CAP  2
++#define PPTP_BEARER_CAP 1
++#endif
++
++#endif /* INC_PPTP_OPTIONS_H */
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_quirks.c
+@@ -0,0 +1,54 @@
++/* pptp_quirks.c ...... various options to fix quirks found in buggy adsl modems
++ *                      mulix <mulix@actcom.co.il>
++ *
++ * $Id: pptp_quirks.c,v 1.2 2001/11/23 03:42:51 quozl Exp $
++ */
++
++#include <string.h>
++#include "orckit_quirks.h"
++#include "pptp_quirks.h"
++
++static int quirk_index = -1;
++
++struct pptp_fixup pptp_fixups[] = {
++    {BEZEQ_ISRAEL, ORCKIT, ORCKIT_ATUR3,
++     orckit_atur3_build_hook,
++     orckit_atur3_start_ctrl_conn_hook,
++     orckit_atur3_set_link_hook}
++};
++
++static int fixups_sz = sizeof(pptp_fixups)/sizeof(pptp_fixups[0]);
++
++/* return 0 on success, non 0 otherwise */
++int set_quirk_index(int index)
++{
++    if (index >= 0 && index < fixups_sz) {
++	quirk_index = index;
++	return 0;
++    }
++
++    return -1;
++}
++
++int get_quirk_index()
++{
++    return quirk_index;
++}
++
++/* return the index for this isp in the quirks table, -1 if not found */
++int find_quirk(const char* isp_name)
++{
++    int i = 0;
++    if (isp_name) {
++	while (i < fixups_sz && pptp_fixups[i].isp) {
++	    if (!strcmp(pptp_fixups[i].isp, isp_name)) {
++		return i;
++	    }
++	    ++i;
++	}
++    }
++
++    return -1;
++}
++
++
+--- /dev/null
++++ b/pppd/plugins/pptp/pptp_quirks.h
+@@ -0,0 +1,59 @@
++/* pptp_quirks.h ...... various options to fix quirks found in buggy adsl modems
++ *                      mulix <mulix@actcom.co.il>
++ *
++ * $Id: pptp_quirks.h,v 1.1 2001/11/20 06:30:10 quozl Exp $
++ */
++
++#ifndef INC_PPTP_QUIRKS_H
++#define INC_PPTP_QUIRKS_H
++
++/* isp defs - correspond to slots in the fixups table */
++#define BEZEQ_ISRAEL "BEZEQ_ISRAEL"
++
++/* vendor defs */
++
++#define ORCKIT 1
++#define ALCATEL 2
++
++/* device defs */
++
++#define ORCKIT_ATUR2 1
++#define ORCKIT_ATUR3 2
++
++#include "pptp_msg.h"
++#include "pptp_ctrl.h"
++
++struct pptp_fixup {
++    const char* isp;    /* which isp? e.g. Bezeq in Israel */
++    int vendor; /* which vendor? e.g. Orckit */
++    int device; /* which device? e.g. Orckit Atur3 */
++
++    /* use this hook to build your own out call request packet */
++    int (*out_call_rqst_hook)(struct pptp_out_call_rqst* packet);
++
++    /* use this hook to build your own start control connection packet */
++    /* note that this hook is called from two different places, depending
++       on whether this is a request or reply */
++    int (*start_ctrl_conn)(struct pptp_start_ctrl_conn* packet);
++
++    /* use this hook if you need to send a 'set_link' packet once
++       the connection is established */
++    int (*set_link_hook)(struct pptp_set_link_info* packet,
++			 int peer_call_id);
++};
++
++extern struct pptp_fixup pptp_fixups[];
++
++/* find the index for this isp in the quirks table */
++/* return the index on success, -1 if not found */
++int find_quirk(const char* isp_name);
++
++/* set the global quirk index. return 0 on success, non 0 otherwise */
++int set_quirk_index(int index);
++
++/* get the global quirk index. return the index on success,
++   -1 if no quirk is defined */
++int get_quirk_index();
++
++
++#endif /* INC_PPTP_QUIRKS_H */
+--- /dev/null
++++ b/pppd/plugins/pptp/util.c
+@@ -0,0 +1,109 @@
++/* util.c ....... error message utilities.
++ *                C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: util.c,v 1.11 2005/08/22 00:49:48 quozl Exp $
++ */
++
++#include <stdio.h>
++#include <stdarg.h>
++#include <syslog.h>
++#include <unistd.h>
++#include <stdlib.h>
++#include "util.h"
++
++#define MAKE_STRING(label) 				\
++va_list ap;						\
++char buf[256], string[256];				\
++va_start(ap, format);					\
++vsnprintf(buf, sizeof(buf), format, ap);		\
++snprintf(string, sizeof(string), "%s %s[%s:%s:%d]: %s",	\
++	 log_string, label, func, file, line, buf);	\
++va_end(ap)
++
++/*** connect a file to a file descriptor **************************************/
++int file2fd(const char *path, const char *mode, int fd)
++{
++    int ok = 0;
++    FILE *file = NULL;
++    file = fopen(path, mode);
++    if (file != NULL && dup2(fileno(file), fd) != -1)
++        ok = 1;
++    if (file) fclose(file);
++    return ok;
++}
++
++/* signal to pipe delivery implementation */
++#include <unistd.h>
++#include <fcntl.h>
++#include <signal.h>
++#include <string.h>
++
++/* pipe private to process */
++static int sigpipe[2];
++
++/* create a signal pipe, returns 0 for success, -1 with errno for failure */
++int sigpipe_create()
++{
++  int rc;
++  
++  rc = pipe(sigpipe);
++  if (rc < 0) return rc;
++  
++  fcntl(sigpipe[0], F_SETFD, FD_CLOEXEC);
++  fcntl(sigpipe[1], F_SETFD, FD_CLOEXEC);
++  
++#ifdef O_NONBLOCK
++#define FLAG_TO_SET O_NONBLOCK
++#else
++#ifdef SYSV
++#define FLAG_TO_SET O_NDELAY
++#else /* BSD */
++#define FLAG_TO_SET FNDELAY
++#endif
++#endif
++  
++  rc = fcntl(sigpipe[1], F_GETFL);
++  if (rc != -1)
++    rc = fcntl(sigpipe[1], F_SETFL, rc | FLAG_TO_SET);
++  if (rc < 0) return rc;
++  return 0;
++#undef FLAG_TO_SET
++}
++
++/* generic handler for signals, writes signal number to pipe */
++void sigpipe_handler(int signum)
++{
++  write(sigpipe[1], &signum, sizeof(signum));
++  signal(signum, sigpipe_handler);
++}
++
++/* assign a signal number to the pipe */
++void sigpipe_assign(int signum)
++{
++  struct sigaction sa;
++
++  memset(&sa, 0, sizeof(sa));
++  sa.sa_handler = sigpipe_handler;
++  sigaction(signum, &sa, NULL);
++}
++
++/* return the signal pipe read file descriptor for select(2) */
++int sigpipe_fd()
++{
++  return sigpipe[0];
++}
++
++/* read and return the pending signal from the pipe */
++int sigpipe_read()
++{
++  int signum;
++  read(sigpipe[0], &signum, sizeof(signum));
++  return signum;
++}
++
++void sigpipe_close()
++{
++  close(sigpipe[0]);
++  close(sigpipe[1]);
++}
++
+--- /dev/null
++++ b/pppd/plugins/pptp/util.h
+@@ -0,0 +1,31 @@
++/* util.h ....... error message utilities.
++ *                C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: util.h,v 1.6 2005/03/10 01:18:20 quozl Exp $
++ */
++
++#ifndef INC_UTIL_H
++#define INC_UTIL_H
++
++int file2fd(const char *path, const char *mode, int fd);
++
++/* signal to pipe delivery implementation */
++
++/* create a signal pipe, returns 0 for success, -1 with errno for failure */
++int sigpipe_create();
++
++/* generic handler for signals, writes signal number to pipe */
++void sigpipe_handler(int signum);
++
++/* assign a signal number to the pipe */
++void sigpipe_assign(int signum);
++
++/* return the signal pipe read file descriptor for select(2) */
++int sigpipe_fd();
++
++/* read and return the pending signal from the pipe */
++int sigpipe_read();
++
++void sigpipe_close();
++
++#endif /* INC_UTIL_H */
+--- /dev/null
++++ b/pppd/plugins/pptp/vector.c
+@@ -0,0 +1,209 @@
++/* vector.c ..... store a vector of PPTP_CALL information and search it
++ *                efficiently.
++ *                C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: vector.c,v 1.3 2003/06/17 10:12:55 reink Exp $
++ */
++
++#include <stdlib.h>
++#include <string.h>
++#include <assert.h>
++#include "pptp_ctrl.h"
++#include "vector.h"
++/* #define VECTOR_DEBUG */
++#ifndef TRUE
++#define TRUE 1
++#endif
++#ifndef FALSE
++#define FALSE 0
++#endif
++
++struct vector_item {
++    int key;
++    PPTP_CALL *call;
++};
++
++struct vector_struct {
++    struct vector_item *item;
++    int size;
++    int alloc;
++#ifdef VECTOR_DEBUG
++    int key_max;
++#endif
++};
++
++static struct vector_item *binary_search(VECTOR *v, int key);
++
++/*** vector_create ************************************************************/
++VECTOR *vector_create()
++{
++    const int INITIAL_SIZE = 4;
++
++    VECTOR *v = malloc(sizeof(*v));
++    if (v == NULL) return v;
++
++    v->size = 0;
++    v->alloc = INITIAL_SIZE;
++    v->item = malloc(sizeof(*(v->item)) * (v->alloc));
++#ifdef VECTOR_DEBUG
++    v->key_max = -1;
++#endif
++    if (v->item == NULL) { free(v); return NULL; }
++    else return v;
++}
++
++/*** vector_destroy ***********************************************************/
++void vector_destroy(VECTOR *v)
++{
++    free(v->item);
++#ifdef VECTOR_DEBUG
++    v->item = NULL;
++#endif
++    free(v);
++}
++
++/*** vector_size **************************************************************/
++int vector_size(VECTOR *v)
++{
++    assert(v != NULL);
++    return v->size;
++}
++
++/*** vector_insert*************************************************************
++ * nice thing about file descriptors is that we are assured by POSIX 
++ * that they are monotonically increasing.
++ */
++int vector_insert(VECTOR *v, int key, PPTP_CALL * call)
++{
++    int i;
++    assert(v != NULL && call != NULL);
++    assert(!vector_contains(v, key));
++#ifdef VECTOR_DEBUG
++    assert(v->key_max < key);
++#endif
++    if (!(v->size < v->alloc)) {
++        void *tmp = realloc(v->item, sizeof(*(v->item)) * 2 * v->alloc);
++        if (tmp != NULL) {
++            v->alloc *= 2;
++            v->item = tmp;
++        } else return FALSE; /* failed to alloc memory. */
++    }
++    assert(v->size < v->alloc);
++    /* for safety, we make this work in the general case;
++     * but this is optimized for adding call to the end of the vector.
++     */
++    for(i = v->size - 1; i >= 0; i--)
++        if (v->item[i].key < key)
++            break;
++    /* insert after item i */
++    memmove(&v->item[i + 2], &v->item[i + 1],
++            (v->size - i - 1) * sizeof(*(v->item)));
++    v->item[i + 1].key  = key;
++    v->item[i + 1].call = call;
++    v->size++;
++#ifdef VECTOR_DEBUG
++    if (v->key_max < key) /* ie, always. */
++        v->key_max = key;
++#endif
++    return TRUE;
++}
++
++/*** vector_remove ************************************************************/
++int  vector_remove(VECTOR *v, int key)
++{
++    struct vector_item *tmp;
++    assert(v != NULL);
++    if ((tmp =binary_search(v,key)) == NULL) return FALSE;
++    assert(tmp >= v->item && tmp < v->item + v->size);
++    memmove(tmp, tmp + 1, (v->size - (v->item - tmp) - 1) * sizeof(*(v->item)));
++    v->size--;
++    return TRUE;
++}
++
++/*** vector_search ************************************************************/
++int  vector_search(VECTOR *v, int key, PPTP_CALL **call)
++{
++    struct vector_item *tmp;
++    assert(v != NULL);
++    tmp = binary_search(v, key);
++    if (tmp ==NULL) return FALSE;
++    *call = tmp->call;
++    return TRUE;
++}
++
++/*** vector_contains **********************************************************/
++int  vector_contains(VECTOR *v, int key)
++{
++    assert(v != NULL);
++    return (binary_search(v, key) != NULL);
++}
++
++/*** vector_item **************************************************************/
++static struct vector_item *binary_search(VECTOR *v, int key)
++{
++    int l,r,x;
++    l = 0;
++    r = v->size - 1;
++    while (r >= l) {
++        x = (l + r)/2;
++        if (key <  v->item[x].key) r = x - 1; else l = x + 1;
++        if (key == v->item[x].key) return &(v->item[x]);
++    }
++    return NULL;
++}
++
++/*** vector_scan ***************************************************************
++ * Hmm.  Let's be fancy and use a binary search for the first
++ * unused key, taking advantage of the list is stored sorted; ie
++ * we can look at pointers and keys at two different locations, 
++ * and if (ptr1 - ptr2) = (key1 - key2) then all the slots
++ * between ptr1 and ptr2 are filled.  Note that ptr1-ptr2 should
++ * never be greater than key1-key2 (no duplicate keys!)... we
++ * check for this.
++ */
++int vector_scan(VECTOR *v, int lo, int hi, int *key)
++{
++    int l,r,x;
++    assert(v != NULL);
++    assert(key != NULL);
++    if ((v->size<1) || (lo < v->item[0].key)) { *key = lo; return TRUE; }
++    /* our array bounds */
++    l = 0;  r = v->size - 1;
++    while (r > l) {
++        /* check for a free spot right after l */
++        if (v->item[l].key + 1 < v->item[l + 1].key) { /* found it! */
++            *key = v->item[l].key + 1;
++            return TRUE;
++        }
++        /* no dice. Let's see if the free spot is before or after the midpoint */
++        x = (l + r)/2;
++        /* Okay, we have right (r), left (l) and the probe (x). */
++        assert(x - l <= v->item[x].key - v->item[l].key);
++        assert(r - x <= v->item[r].key - v->item[x].key);
++        if (x - l < v->item[x].key - v->item[l].key)
++            /* room between l and x */
++            r = x;
++        else /* no room between l and x */
++            if (r - x < v->item[r].key - v->item[x].key)
++                /* room between x and r */
++                l = x;
++            else /* no room between x and r, either */
++                break; /* game over, man. */
++    }
++    /* no room found in already allocated space.  Check to see if
++     * there's free space above allocated entries. */
++    if (v->item[v->size - 1].key < hi) {
++        *key = v->item[v->size - 1].key + 1;
++        return TRUE;
++    }
++    /* outta luck */
++    return FALSE;
++}
++
++/*** vector_get_Nth ***********************************************************/
++PPTP_CALL * vector_get_Nth(VECTOR *v, int n)
++{
++    assert(v != NULL);
++    assert(0 <= n && n < vector_size(v));
++    return v->item[n].call;
++}
+--- /dev/null
++++ b/pppd/plugins/pptp/vector.h
+@@ -0,0 +1,31 @@
++/* vector.h ..... store a vector of PPTP_CALL information and search it
++ *                efficiently.
++ *                C. Scott Ananian <cananian@alumni.princeton.edu>
++ *
++ * $Id: vector.h,v 1.1.1.1 2000/12/23 08:19:51 scott Exp $
++ */
++
++#ifndef INC_VECTOR_H
++#define INC_VECTOR_H
++
++#include "pptp_ctrl.h" /* for definition of PPTP_CALL */
++
++typedef struct vector_struct VECTOR;
++
++VECTOR *vector_create();
++void vector_destroy(VECTOR *v);
++
++int vector_size(VECTOR *v);
++
++/* vector_insert and vector_search return TRUE on success, FALSE on failure. */
++int  vector_insert(VECTOR *v, int key, PPTP_CALL * call);
++int  vector_remove(VECTOR *v, int key);
++int  vector_search(VECTOR *v, int key, PPTP_CALL ** call);
++/* vector_contains returns FALSE if not found, TRUE if found. */
++int  vector_contains(VECTOR *v, int key);
++/* find first unused key. Returns TRUE on success, FALSE if no. */
++int  vector_scan(VECTOR *v, int lo, int hi, int *key);
++/* get a specific PPTP_CALL ... useful only when iterating. */
++PPTP_CALL * vector_get_Nth(VECTOR *v, int n);
++
++#endif /* INC_VECTOR_H */