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demand-dial links with dynamic IP numbers where the program that causes the dial bind()s to an interface address that is subsequently changed after ppp negotiation. The problem is defeated by adding negotiated addresses to the tun interface as additional alias addresses and providing a set of ``iface'' commands for managing the interface. Libalias is also required (and what a name clash!) - it happily IP-aliases the address so that the source is that of the primary (negotiated) interface and un-IP-aliases it on the way back. An ``enable iface-alias'' is done implicitly by the -alias command line switch. If -alias isn't given, iface-aliasing is disabled by default and can't be enabled 'till an ``alias enable yes'' is done. ``alias enable no'' silently disables iface-alias. So, for dynamic-IP-type-connections, running ``ppp -alias -auto blah'' will work for the first connection, although existing bindings will not survive a disconnect/connect as the TCP peer will be trying to send to the old IP address - the packets won't route. It's now a lot easier to add IPXCP to ppp with minor updates to the new iface.[ch] (if anyone ever gets 'round to it). It's also now possible to manually add interface aliases with something like ``iface add 1.2.3.4/24 5.6.7.8''. This allows multi-homed ppp links :-)
190 lines
6.9 KiB
C
190 lines
6.9 KiB
C
/*-
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* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: bundle.h,v 1.13 1998/08/25 17:48:42 brian Exp $
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*/
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#define PHASE_DEAD 0 /* Link is dead */
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#define PHASE_ESTABLISH 1 /* Establishing link */
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#define PHASE_AUTHENTICATE 2 /* Being authenticated */
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#define PHASE_NETWORK 3 /* We're alive ! */
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#define PHASE_TERMINATE 4 /* Terminating link */
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/* cfg.opt bit settings */
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#define OPT_IDCHECK 0x01
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#define OPT_LOOPBACK 0x02
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#define OPT_PASSWDAUTH 0x04
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#define OPT_PROXY 0x08
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#define OPT_SROUTES 0x10
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#define OPT_THROUGHPUT 0x20
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#define OPT_UTMP 0x40
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#define OPT_IFACEALIAS 0x80
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#define MAX_ENDDISC_CLASS 5
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#define Enabled(b, o) ((b)->cfg.opt & (o))
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struct sockaddr_un;
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struct datalink;
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struct physical;
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struct link;
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struct server;
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struct prompt;
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struct iface;
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struct bundle {
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struct descriptor desc; /* really all our datalinks */
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int unit; /* The device/interface unit number */
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const char **argv; /* From main() */
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struct {
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char Name[20]; /* The /dev/XXXX name */
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int fd; /* The /dev/XXXX descriptor */
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} dev;
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#if 0
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struct {
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int Index; /* The interface index */
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char *Name; /* The interface name */
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} ifp;
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#endif
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u_long ifSpeed; /* struct tuninfo speed */
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struct iface *iface; /* Interface information */
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int routing_seq; /* The current routing sequence number */
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u_int phase; /* Curent phase */
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struct {
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int all; /* Union of all physical::type's */
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int open; /* Union of all open physical::type's */
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} phys_type;
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unsigned CleaningUp : 1; /* Going to exit.... */
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unsigned AliasEnabled : 1; /* Are we using libalias ? */
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struct fsm_parent fsm; /* Our callback functions */
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struct datalink *links; /* Our data links */
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struct {
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int idle_timeout; /* NCP Idle timeout value */
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struct {
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char name[50]; /* PAP/CHAP system name */
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char key[50]; /* PAP/CHAP key */
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} auth;
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unsigned opt; /* Uses OPT_ bits from above */
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char label[50]; /* last thing `load'ed */
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u_short mtu; /* Interface mtu */
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struct { /* We need/don't need another link when */
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struct { /* more/less than */
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int packets; /* this number of packets are queued for */
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int timeout; /* this number of seconds */
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} max, min;
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} autoload;
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struct {
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int timeout; /* How long to leave the output queue choked */
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} choked;
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} cfg;
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struct {
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struct ipcp ipcp; /* Our IPCP FSM */
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struct mp mp; /* Our MP */
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} ncp;
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struct {
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struct filter in; /* incoming packet filter */
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struct filter out; /* outgoing packet filter */
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struct filter dial; /* dial-out packet filter */
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struct filter alive; /* keep-alive packet filter */
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} filter;
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struct {
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struct pppTimer timer; /* timeout after cfg.idle_timeout */
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time_t done;
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} idle;
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struct {
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int fd; /* write status here */
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} notify;
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struct {
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struct pppTimer timer;
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time_t done;
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unsigned running : 1;
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unsigned comingup : 1;
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} autoload;
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struct {
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struct pppTimer timer; /* choked output queue timer */
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} choked;
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};
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#define descriptor2bundle(d) \
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((d)->type == BUNDLE_DESCRIPTOR ? (struct bundle *)(d) : NULL)
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extern struct bundle *bundle_Create(const char *, int, const char **);
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extern void bundle_Destroy(struct bundle *);
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extern const char *bundle_PhaseName(struct bundle *);
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#define bundle_Phase(b) ((b)->phase)
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extern void bundle_NewPhase(struct bundle *, u_int);
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extern void bundle_LinksRemoved(struct bundle *);
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extern int bundle_LinkIsUp(const struct bundle *);
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extern int bundle_SetRoute(struct bundle *, int, struct in_addr,
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struct in_addr, struct in_addr, int, int);
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extern void bundle_Close(struct bundle *, const char *, int);
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extern void bundle_Down(struct bundle *, int);
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extern void bundle_Open(struct bundle *, const char *, int, int);
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extern void bundle_LinkClosed(struct bundle *, struct datalink *);
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extern int bundle_FillQueues(struct bundle *);
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extern int bundle_ShowLinks(struct cmdargs const *);
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extern int bundle_ShowStatus(struct cmdargs const *);
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extern void bundle_StartIdleTimer(struct bundle *);
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extern void bundle_SetIdleTimer(struct bundle *, int);
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extern void bundle_StopIdleTimer(struct bundle *);
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extern int bundle_IsDead(struct bundle *);
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extern struct datalink *bundle2datalink(struct bundle *, const char *);
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extern void bundle_RegisterDescriptor(struct bundle *, struct descriptor *);
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extern void bundle_UnRegisterDescriptor(struct bundle *, struct descriptor *);
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extern void bundle_SetTtyCommandMode(struct bundle *, struct datalink *);
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extern int bundle_DatalinkClone(struct bundle *, struct datalink *,
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const char *);
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extern void bundle_DatalinkRemove(struct bundle *, struct datalink *);
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extern void bundle_CleanDatalinks(struct bundle *);
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extern void bundle_SetLabel(struct bundle *, const char *);
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extern const char *bundle_GetLabel(struct bundle *);
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extern void bundle_SendDatalink(struct datalink *, int, struct sockaddr_un *);
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extern void bundle_ReceiveDatalink(struct bundle *, int, struct sockaddr_un *);
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extern int bundle_SetMode(struct bundle *, struct datalink *, int);
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extern int bundle_RenameDatalink(struct bundle *, struct datalink *,
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const char *);
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extern void bundle_setsid(struct bundle *, int);
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extern void bundle_LockTun(struct bundle *);
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