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2cb305af77
freebsd-dev/usr.sbin/ppp/mp.c
Brian Somers 2cb305af77 Rewrite the link descriptor transfer code in MP mode. 
Previously, ppp attempted to bind() to a local domain tcp socket
based on the peer authname & enddisc.  If it succeeded, it listen()ed
and became MP server.  If it failed, it connect()ed and became MP
client.  The server then select()ed on the descriptor, accept()ed
it and wrote its pid to it then read the link data & link file descriptor,
and finally sent an ack (``!'').  The client would read() the server
pid, transfer the link lock to that pid, send the link data & descriptor
and read the ack.  It would then close the descriptor and clean up.

There was a race between the bind() and listen() where someone could
attempt to connect() and fail.

This change removes the race.  Now ppp makes the RCVBUF big enough on a
socket descriptor and attempts to bind() to a local domain *udp* socket
(same name as before).  If it succeeds, it becomes MP server.  If it
fails, it sets the SNDBUF and connect()s, becoming MP client.  The server
select()s on the descriptor and recvmsg()s the message, insisting on at
least two descriptors (plus the link data).  It uses the second descriptor
to write() its pid then read()s an ack (``!'').  The client creates a
socketpair() and sendmsg()s the link data, link descriptor and one of
the socketpair descriptors.  It then read()s the server pid from the
other socketpair descriptor, transfers any locks and write()s an ack.

Now, there can be no race, and a connect() failure indicates a stale
socket file.

This also fixes MP ppp over ethernet, where the struct msghdr was being
misconstructed when transferring the control socket descriptor.

Also, if we fail to send the link, don't hang around in a ``session
owner'' state, just do the setsid() and fork() if it's required to
disown a tty.

UDP idea suggested by: Chris Bennet from Mindspring at FreeBSDCon
1999-11-25 02:47:04 +00:00

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/*-
* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <paths.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#ifndef NONAT
#include "nat_cmd.h"
#endif
#include "vjcomp.h"
#include "ua.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "ipcp.h"
#include "auth.h"
#include "lcp.h"
#include "async.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "chat.h"
#include "proto.h"
#include "filter.h"
#include "mp.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "ip.h"
#include "prompt.h"
#include "id.h"
#include "arp.h"
/*
* When we set our MP socket buffer size, we need some extra space
* for the kernel to use to transfer the file descriptors and their
* control structure. In practice, this seems to be
*
* sizeof(struct msghdr) + sizeof(int) * SEND_MAXFD
*
* (see bundle.c for SEND_MAXFD), but as this isn't actually documented,
* we just add ``a bit extra''
*/
#define SOCKET_OVERHEAD 100
void
peerid_Init(struct peerid *peer)
{
peer->enddisc.class = 0;
*peer->enddisc.address = '\0';
peer->enddisc.len = 0;
*peer->authname = '\0';
}
int
peerid_Equal(const struct peerid *p1, const struct peerid *p2)
{
return !strcmp(p1->authname, p2->authname) &&
p1->enddisc.class == p2->enddisc.class &&
p1->enddisc.len == p2->enddisc.len &&
!memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len);
}
static u_int32_t
inc_seq(unsigned is12bit, u_int32_t seq)
{
seq++;
if (is12bit) {
if (seq & 0xfffff000)
seq = 0;
} else if (seq & 0xff000000)
seq = 0;
return seq;
}
static int
isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2)
{
u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200;
if (seq1 > max) {
if (seq2 < 0x200 || seq2 > seq1)
return 1;
} else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2)
return 1;
return 0;
}
static int
mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
{
if (mp->local_is12bit) {
u_int16_t val;
ua_ntohs(MBUF_CTOP(m), &val);
if (val & 0x3000) {
log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
return 0;
}
header->begin = val & 0x8000 ? 1 : 0;
header->end = val & 0x4000 ? 1 : 0;
header->seq = val & 0x0fff;
return 2;
} else {
ua_ntohl(MBUF_CTOP(m), &header->seq);
if (header->seq & 0x3f000000) {
log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
return 0;
}
header->begin = header->seq & 0x80000000 ? 1 : 0;
header->end = header->seq & 0x40000000 ? 1 : 0;
header->seq &= 0x00ffffff;
return 4;
}
}
static void
mp_LayerStart(void *v, struct fsm *fp)
{
/* The given FSM (ccp) is about to start up ! */
}
static void
mp_LayerUp(void *v, struct fsm *fp)
{
/* The given fsm (ccp) is now up */
}
static void
mp_LayerDown(void *v, struct fsm *fp)
{
/* The given FSM (ccp) has been told to come down */
}
static void
mp_LayerFinish(void *v, struct fsm *fp)
{
/* The given fsm (ccp) is now down */
if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
fsm_Open(fp); /* CCP goes to ST_STOPPED */
}
static void
mp_UpDown(void *v)
{
struct mp *mp = (struct mp *)v;
int percent;
percent = mp->link.throughput.OctetsPerSecond * 800 / mp->bundle->bandwidth;
if (percent >= mp->cfg.autoload.max) {
log_Printf(LogDEBUG, "%d%% saturation - bring a link up ?\n", percent);
bundle_AutoAdjust(mp->bundle, percent, AUTO_UP);
} else if (percent <= mp->cfg.autoload.min) {
log_Printf(LogDEBUG, "%d%% saturation - bring a link down ?\n", percent);
bundle_AutoAdjust(mp->bundle, percent, AUTO_DOWN);
}
}
void
mp_StopAutoloadTimer(struct mp *mp)
{
throughput_stop(&mp->link.throughput);
}
void
mp_CheckAutoloadTimer(struct mp *mp)
{
if (mp->link.throughput.SamplePeriod != mp->cfg.autoload.period) {
throughput_destroy(&mp->link.throughput);
throughput_init(&mp->link.throughput, mp->cfg.autoload.period);
throughput_callback(&mp->link.throughput, mp_UpDown, mp);
}
if (bundle_WantAutoloadTimer(mp->bundle))
throughput_start(&mp->link.throughput, "MP throughput", 1);
else
mp_StopAutoloadTimer(mp);
}
void
mp_RestartAutoloadTimer(struct mp *mp)
{
if (mp->link.throughput.SamplePeriod != mp->cfg.autoload.period)
mp_CheckAutoloadTimer(mp);
else
throughput_clear(&mp->link.throughput, THROUGHPUT_OVERALL, NULL);
}
void
mp_Init(struct mp *mp, struct bundle *bundle)
{
mp->peer_is12bit = mp->local_is12bit = 0;
mp->peer_mrru = mp->local_mrru = 0;
peerid_Init(&mp->peer);
mp->out.seq = 0;
mp->out.link = 0;
mp->seq.min_in = 0;
mp->seq.next_in = 0;
mp->inbufs = NULL;
mp->bundle = bundle;
mp->link.type = LOGICAL_LINK;
mp->link.name = "mp";
mp->link.len = sizeof *mp;
mp->cfg.autoload.period = SAMPLE_PERIOD;
mp->cfg.autoload.min = mp->cfg.autoload.max = 0;
throughput_init(&mp->link.throughput, mp->cfg.autoload.period);
throughput_callback(&mp->link.throughput, mp_UpDown, mp);
memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
mp->fsmp.LayerStart = mp_LayerStart;
mp->fsmp.LayerUp = mp_LayerUp;
mp->fsmp.LayerDown = mp_LayerDown;
mp->fsmp.LayerFinish = mp_LayerFinish;
mp->fsmp.object = mp;
mpserver_Init(&mp->server);
mp->cfg.mrru = 0;
mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED;
mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED;
mp->cfg.enddisc.class = 0;
*mp->cfg.enddisc.address = '\0';
mp->cfg.enddisc.len = 0;
lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL);
ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp);
link_EmptyStack(&mp->link);
link_Stack(&mp->link, &protolayer);
link_Stack(&mp->link, &ccplayer);
link_Stack(&mp->link, &vjlayer);
#ifndef NONAT
link_Stack(&mp->link, &natlayer);
#endif
}
int
mp_Up(struct mp *mp, struct datalink *dl)
{
struct lcp *lcp = &dl->physical->link.lcp;
if (mp->active) {
/* We're adding a link - do a last validation on our parameters */
if (!peerid_Equal(&dl->peer, &mp->peer)) {
log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name);
return MP_FAILED;
}
if (mp->local_mrru != lcp->want_mrru ||
mp->peer_mrru != lcp->his_mrru ||
mp->local_is12bit != lcp->want_shortseq ||
mp->peer_is12bit != lcp->his_shortseq) {
log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n",
dl->name);
return MP_FAILED;
}
return MP_ADDED;
} else {
/* First link in multilink mode */
mp->local_mrru = lcp->want_mrru;
mp->peer_mrru = lcp->his_mrru;
mp->local_is12bit = lcp->want_shortseq;
mp->peer_is12bit = lcp->his_shortseq;
mp->peer = dl->peer;
throughput_destroy(&mp->link.throughput);
throughput_init(&mp->link.throughput, mp->cfg.autoload.period);
throughput_callback(&mp->link.throughput, mp_UpDown, mp);
memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
mp->out.seq = 0;
mp->out.link = 0;
mp->seq.min_in = 0;
mp->seq.next_in = 0;
/*
* Now we create our server socket.
* If it already exists, join it. Otherwise, create and own it
*/
switch (mpserver_Open(&mp->server, &mp->peer)) {
case MPSERVER_CONNECTED:
log_Printf(LogPHASE, "mp: Transfer link on %s\n",
mp->server.socket.sun_path);
mp->server.send.dl = dl; /* Defer 'till it's safe to send */
return MP_LINKSENT;
case MPSERVER_FAILED:
return MP_FAILED;
case MPSERVER_LISTENING:
log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path);
log_Printf(LogPHASE, " First link: %s\n", dl->name);
/* Re-point our IPCP layer at our MP link */
ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link);
/* Our lcp's already up 'cos of the NULL parent */
if (ccp_SetOpenMode(&mp->link.ccp)) {
fsm_Up(&mp->link.ccp.fsm);
fsm_Open(&mp->link.ccp.fsm);
}
mp->active = 1;
break;
}
}
return MP_UP;
}
void
mp_Down(struct mp *mp)
{
if (mp->active) {
struct mbuf *next;
/* Stop that ! */
mp_StopAutoloadTimer(mp);
/* Don't want any more of these */
mpserver_Close(&mp->server);
/* CCP goes down with a bang */
fsm2initial(&mp->link.ccp.fsm);
/* Received fragments go in the bit-bucket */
while (mp->inbufs) {
next = mp->inbufs->pnext;
mbuf_Free(mp->inbufs);
mp->inbufs = next;
}
peerid_Init(&mp->peer);
mp->active = 0;
}
}
void
mp_linkInit(struct mp_link *mplink)
{
mplink->seq = 0;
mplink->bandwidth = 0;
}
static void
mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p)
{
struct mp_header mh, h;
struct mbuf *q, *last;
int32_t seq;
/*
* When `m' and `p' are NULL, it means our oldest link has gone down.
* We want to determine a new min, and process any intermediate stuff
* as normal
*/
if (m && mp_ReadHeader(mp, m, &mh) == 0) {
mbuf_Free(m);
return;
}
if (p) {
seq = p->dl->mp.seq;
p->dl->mp.seq = mh.seq;
} else
seq = mp->seq.min_in;
if (mp->seq.min_in == seq) {
/*
* We've received new data on the link that has our min (oldest) seq.
* Figure out which link now has the smallest (oldest) seq.
*/
struct datalink *dl;
mp->seq.min_in = (u_int32_t)-1;
for (dl = mp->bundle->links; dl; dl = dl->next)
if (dl->state == DATALINK_OPEN &&
(mp->seq.min_in == -1 ||
isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in)))
mp->seq.min_in = dl->mp.seq;
}
/*
* Now process as many of our fragments as we can, adding our new
* fragment in as we go, and ordering with the oldest at the top of
* the queue.
*/
if (!mp->inbufs) {
mp->inbufs = m;
m = NULL;
}
last = NULL;
seq = mp->seq.next_in;
q = mp->inbufs;
while (q) {
mp_ReadHeader(mp, q, &h);
if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) {
/* Our received fragment fits in before this one, so link it in */
if (last)
last->pnext = m;
else
mp->inbufs = m;
m->pnext = q;
q = m;
h = mh;
m = NULL;
}
if (h.seq != seq) {
/* we're missing something :-( */
if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) {
/* we're never gonna get it */
struct mbuf *next;
/* Zap all older fragments */
while (mp->inbufs != q) {
log_Printf(LogDEBUG, "Drop frag\n");
next = mp->inbufs->pnext;
mbuf_Free(mp->inbufs);
mp->inbufs = next;
}
/*
* Zap everything until the next `end' fragment OR just before
* the next `begin' fragment OR 'till seq.min_in - whichever
* comes first.
*/
do {
mp_ReadHeader(mp, mp->inbufs, &h);
if (h.begin) {
/* We might be able to process this ! */
h.seq--; /* We're gonna look for fragment with h.seq+1 */
break;
}
next = mp->inbufs->pnext;
log_Printf(LogDEBUG, "Drop frag %u\n", h.seq);
mbuf_Free(mp->inbufs);
mp->inbufs = next;
} while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in,
h.seq) || h.end));
/*
* Continue processing things from here.
* This deals with the possibility that we received a fragment
* on the slowest link that invalidates some of our data (because
* of the hole at `q'), but where there are subsequent `whole'
* packets that have already been received.
*/
mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
last = NULL;
q = mp->inbufs;
} else
/* we may still receive the missing fragment */
break;
} else if (h.end) {
/* We've got something, reassemble */
struct mbuf **frag = &q;
int len;
u_long first = -1;
do {
*frag = mp->inbufs;
mp->inbufs = mp->inbufs->pnext;
len = mp_ReadHeader(mp, *frag, &h);
if (first == -1)
first = h.seq;
(*frag)->offset += len;
(*frag)->cnt -= len;
(*frag)->pnext = NULL;
if (frag == &q && !h.begin) {
log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n",
(u_long)h.seq);
mbuf_Free(q);
q = NULL;
} else if (frag != &q && h.begin) {
log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n",
(u_long)h.seq - 1);
/*
* Stuff our fragment back at the front of the queue and zap
* our half-assembed packet.
*/
(*frag)->pnext = mp->inbufs;
mp->inbufs = *frag;
*frag = NULL;
mbuf_Free(q);
q = NULL;
frag = &q;
h.end = 0; /* just in case it's a whole packet */
} else
do
frag = &(*frag)->next;
while (*frag != NULL);
} while (!h.end);
if (q) {
q = mbuf_Contiguous(q);
log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n",
first, (u_long)h.seq, mbuf_Length(q));
link_PullPacket(&mp->link, MBUF_CTOP(q), q->cnt, mp->bundle);
mbuf_Free(q);
}
mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
last = NULL;
q = mp->inbufs;
} else {
/* Look for the next fragment */
seq = inc_seq(mp->local_is12bit, seq);
last = q;
q = q->pnext;
}
}
if (m) {
/* We still have to find a home for our new fragment */
last = NULL;
for (q = mp->inbufs; q; last = q, q = q->pnext) {
mp_ReadHeader(mp, q, &h);
if (isbefore(mp->local_is12bit, mh.seq, h.seq))
break;
}
/* Our received fragment fits in here */
if (last)
last->pnext = m;
else
mp->inbufs = m;
m->pnext = q;
}
}
struct mbuf *
mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
struct physical *p = link2physical(l);
if (!bundle->ncp.mp.active)
/* Let someone else deal with it ! */
return bp;
if (p == NULL) {
log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n");
mbuf_Free(bp);
} else {
mbuf_SetType(bp, MB_MPIN);
mp_Assemble(&bundle->ncp.mp, bp, p);
}
return NULL;
}
static void
mp_Output(struct mp *mp, struct bundle *bundle, struct link *l,
struct mbuf *m, u_int32_t begin, u_int32_t end)
{
struct mbuf *mo;
/* Stuff an MP header on the front of our packet and send it */
mo = mbuf_Alloc(4, MB_MPOUT);
mo->next = m;
if (mp->peer_is12bit) {
u_int16_t val;
val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq;
ua_htons(&val, MBUF_CTOP(mo));
mo->cnt = 2;
} else {
u_int32_t val;
val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq;
ua_htonl(&val, MBUF_CTOP(mo));
mo->cnt = 4;
}
if (log_IsKept(LogDEBUG))
log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n",
mp->out.seq, mbuf_Length(mo), l->name);
mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq);
link_PushPacket(l, mo, bundle, LINK_QUEUES(l) - 1, PROTO_MP);
}
int
mp_FillQueues(struct bundle *bundle)
{
struct mp *mp = &bundle->ncp.mp;
struct datalink *dl, *fdl;
int total, add, len, thislink, nlinks;
u_int32_t begin, end;
struct mbuf *m, *mo;
thislink = nlinks = 0;
for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
/* Include non-open links here as mp->out.link will stay more correct */
if (!fdl) {
if (thislink == mp->out.link)
fdl = dl;
else
thislink++;
}
nlinks++;
}
if (!fdl) {
fdl = bundle->links;
if (!fdl)
return 0;
thislink = 0;
}
total = 0;
for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) {
if (!dl) {
dl = bundle->links;
thislink = 0;
}
if (dl->state != DATALINK_OPEN)
continue;
if (dl->physical->out)
/* this link has suffered a short write. Let it continue */
continue;
add = link_QueueLen(&dl->physical->link);
total += add;
if (add)
/* this link has got stuff already queued. Let it continue */
continue;
if (!link_QueueLen(&mp->link) && !ip_PushPacket(&mp->link, bundle))
/* Nothing else to send */
break;
m = link_Dequeue(&mp->link);
len = mbuf_Length(m);
begin = 1;
end = 0;
while (!end) {
if (dl->state == DATALINK_OPEN) {
/* Write at most his_mru bytes to the physical link */
if (len <= dl->physical->link.lcp.his_mru) {
mo = m;
end = 1;
mbuf_SetType(mo, MB_MPOUT);
} else {
/* It's > his_mru, chop the packet (`m') into bits */
mo = mbuf_Alloc(dl->physical->link.lcp.his_mru, MB_MPOUT);
len -= mo->cnt;
m = mbuf_Read(m, MBUF_CTOP(mo), mo->cnt);
}
mp_Output(mp, bundle, &dl->physical->link, mo, begin, end);
begin = 0;
}
if (!end) {
nlinks--;
dl = dl->next;
if (!dl) {
dl = bundle->links;
thislink = 0;
} else
thislink++;
}
}
}
mp->out.link = thislink; /* Start here next time */
return total;
}
int
mp_SetDatalinkBandwidth(struct cmdargs const *arg)
{
int val;
if (arg->argc != arg->argn+1)
return -1;
val = atoi(arg->argv[arg->argn]);
if (val <= 0) {
log_Printf(LogWARN, "The link bandwidth must be greater than zero\n");
return 1;
}
arg->cx->mp.bandwidth = val;
if (arg->cx->state == DATALINK_OPEN)
bundle_CalculateBandwidth(arg->bundle);
return 0;
}
int
mp_ShowStatus(struct cmdargs const *arg)
{
struct mp *mp = &arg->bundle->ncp.mp;
prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in");
if (mp->active) {
struct mbuf *m, *lm;
int bufs = 0;
lm = NULL;
prompt_Printf(arg->prompt, "Socket: %s\n",
mp->server.socket.sun_path);
for (m = mp->inbufs; m; m = m->pnext) {
bufs++;
lm = m;
}
prompt_Printf(arg->prompt, "Pending frags: %d", bufs);
if (bufs) {
struct mp_header mh;
unsigned long first, last;
first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0;
last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0;
prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n",
first, last, (unsigned long)mp->seq.next_in,
(unsigned long)mp->seq.min_in);
prompt_Printf(arg->prompt, " First has %sbegin bit and "
"%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no ");
}
prompt_Printf(arg->prompt, "\n");
}
prompt_Printf(arg->prompt, "\nMy Side:\n");
if (mp->active) {
prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq);
prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru);
prompt_Printf(arg->prompt, " Short Seq: %s\n",
mp->local_is12bit ? "on" : "off");
}
prompt_Printf(arg->prompt, " Discriminator: %s\n",
mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address,
mp->cfg.enddisc.len));
prompt_Printf(arg->prompt, "\nHis Side:\n");
if (mp->active) {
prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname);
prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in);
prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru);
prompt_Printf(arg->prompt, " Short Seq: %s\n",
mp->peer_is12bit ? "on" : "off");
}
prompt_Printf(arg->prompt, " Discriminator: %s\n",
mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
mp->peer.enddisc.len));
prompt_Printf(arg->prompt, "\nDefaults:\n");
prompt_Printf(arg->prompt, " MRRU: ");
if (mp->cfg.mrru)
prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru);
else
prompt_Printf(arg->prompt, "disabled\n");
prompt_Printf(arg->prompt, " Short Seq: %s\n",
command_ShowNegval(mp->cfg.shortseq));
prompt_Printf(arg->prompt, " Discriminator: %s\n",
command_ShowNegval(mp->cfg.negenddisc));
prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%,"
" period %d secs\n", mp->cfg.autoload.min,
mp->cfg.autoload.max, mp->cfg.autoload.period);
return 0;
}
const char *
mp_Enddisc(u_char c, const char *address, int len)
{
static char result[100]; /* Used immediately after it's returned */
int f, header;
switch (c) {
case ENDDISC_NULL:
sprintf(result, "Null Class");
break;
case ENDDISC_LOCAL:
snprintf(result, sizeof result, "Local Addr: %.*s", len, address);
break;
case ENDDISC_IP:
if (len == 4)
snprintf(result, sizeof result, "IP %s",
inet_ntoa(*(const struct in_addr *)address));
else
sprintf(result, "IP[%d] ???", len);
break;
case ENDDISC_MAC:
if (len == 6) {
const u_char *m = (const u_char *)address;
snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x",
m[0], m[1], m[2], m[3], m[4], m[5]);
} else
sprintf(result, "MAC[%d] ???", len);
break;
case ENDDISC_MAGIC:
sprintf(result, "Magic: 0x");
header = strlen(result);
if (len > sizeof result - header - 1)
len = sizeof result - header - 1;
for (f = 0; f < len; f++)
sprintf(result + header + 2 * f, "%02x", address[f]);
break;
case ENDDISC_PSN:
snprintf(result, sizeof result, "PSN: %.*s", len, address);
break;
default:
sprintf(result, "%d: ", (int)c);
header = strlen(result);
if (len > sizeof result - header - 1)
len = sizeof result - header - 1;
for (f = 0; f < len; f++)
sprintf(result + header + 2 * f, "%02x", address[f]);
break;
}
return result;
}
int
mp_SetEnddisc(struct cmdargs const *arg)
{
struct mp *mp = &arg->bundle->ncp.mp;
struct in_addr addr;
switch (bundle_Phase(arg->bundle)) {
case PHASE_DEAD:
break;
case PHASE_ESTABLISH:
/* Make sure none of our links are DATALINK_LCP or greater */
if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) {
log_Printf(LogWARN, "enddisc: Only changable before"
" LCP negotiations\n");
return 1;
}
break;
default:
log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n");
return 1;
}
if (arg->argc == arg->argn) {
mp->cfg.enddisc.class = 0;
*mp->cfg.enddisc.address = '\0';
mp->cfg.enddisc.len = 0;
} else if (arg->argc > arg->argn) {
if (!strcasecmp(arg->argv[arg->argn], "label")) {
mp->cfg.enddisc.class = ENDDISC_LOCAL;
strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label);
mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
} else if (!strcasecmp(arg->argv[arg->argn], "ip")) {
if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
else
addr = arg->bundle->ncp.ipcp.my_ip;
memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr);
mp->cfg.enddisc.class = ENDDISC_IP;
mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr;
} else if (!strcasecmp(arg->argv[arg->argn], "mac")) {
struct sockaddr_dl hwaddr;
int s;
if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
else
addr = arg->bundle->ncp.ipcp.my_ip;
s = ID0socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno));
return 2;
}
if (get_ether_addr(s, addr, &hwaddr)) {
mp->cfg.enddisc.class = ENDDISC_MAC;
memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen,
hwaddr.sdl_alen);
mp->cfg.enddisc.len = hwaddr.sdl_alen;
} else {
log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n",
inet_ntoa(addr));
close(s);
return 4;
}
close(s);
} else if (!strcasecmp(arg->argv[arg->argn], "magic")) {
int f;
randinit();
for (f = 0; f < 20; f += sizeof(long))
*(long *)(mp->cfg.enddisc.address + f) = random();
mp->cfg.enddisc.class = ENDDISC_MAGIC;
mp->cfg.enddisc.len = 20;
} else if (!strcasecmp(arg->argv[arg->argn], "psn")) {
if (arg->argc > arg->argn+1) {
mp->cfg.enddisc.class = ENDDISC_PSN;
strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]);
mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
} else {
log_Printf(LogWARN, "PSN endpoint requires additional data\n");
return 5;
}
} else {
log_Printf(LogWARN, "%s: Unrecognised endpoint type\n",
arg->argv[arg->argn]);
return 6;
}
}
return 0;
}
static int
mpserver_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
int *n)
{
struct mpserver *s = descriptor2mpserver(d);
int result;
result = 0;
if (s->send.dl != NULL) {
/* We've connect()ed */
if (!link_QueueLen(&s->send.dl->physical->link) &&
!s->send.dl->physical->out) {
/* Only send if we've transmitted all our data (i.e. the ConfigAck) */
result -= datalink_RemoveFromSet(s->send.dl, r, w, e);
bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
s->send.dl = NULL;
s->fd = -1;
} else
/* Never read from a datalink that's on death row ! */
result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL);
} else if (r && s->fd >= 0) {
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
result++;
}
return result;
}
static int
mpserver_IsSet(struct descriptor *d, const fd_set *fdset)
{
struct mpserver *s = descriptor2mpserver(d);
return s->fd >= 0 && FD_ISSET(s->fd, fdset);
}
static void
mpserver_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
{
struct mpserver *s = descriptor2mpserver(d);
bundle_ReceiveDatalink(bundle, s->fd);
}
static int
mpserver_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
{
/* We never want to write here ! */
log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n");
return 0;
}
void
mpserver_Init(struct mpserver *s)
{
s->desc.type = MPSERVER_DESCRIPTOR;
s->desc.UpdateSet = mpserver_UpdateSet;
s->desc.IsSet = mpserver_IsSet;
s->desc.Read = mpserver_Read;
s->desc.Write = mpserver_Write;
s->send.dl = NULL;
s->fd = -1;
memset(&s->socket, '\0', sizeof s->socket);
}
int
mpserver_Open(struct mpserver *s, struct peerid *peer)
{
int f, l, bufsz;
mode_t mask;
if (s->fd != -1) {
log_Printf(LogALERT, "Internal error ! mpserver already open\n");
mpserver_Close(s);
}
l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-",
_PATH_VARRUN, peer->authname, peer->enddisc.class);
for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) {
snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l,
"%02x", *(u_char *)(peer->enddisc.address+f));
l += 2;
}
s->socket.sun_family = AF_LOCAL;
s->socket.sun_len = sizeof s->socket;
s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0);
if (s->fd < 0) {
log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno));
return MPSERVER_FAILED;
}
setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket,
sizeof s->socket);
mask = umask(0177);
/*
* Calculate how big a link is. It's vital that we set our receive
* buffer size before binding the socket, otherwise we'll end up with
* a sendmsg() failing with ENOBUFS.
*/
bufsz = bundle_LinkSize() + SOCKET_OVERHEAD;
log_Printf(LogDEBUG, "Setting MP socket buffer size to %d\n", bufsz);
if (setsockopt(s->fd, SOL_SOCKET, SO_RCVBUF, &bufsz, sizeof bufsz) == -1)
log_Printf(LogERROR, "setsockopt(SO_RCVBUF, %d): %s\n", bufsz,
strerror(errno));
if (ID0bind_un(s->fd, &s->socket) < 0) {
if (errno != EADDRINUSE) {
log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n",
s->socket.sun_path, strerror(errno));
umask(mask);
close(s->fd);
s->fd = -1;
return MPSERVER_FAILED;
}
/* Ok, so we'll play sender... set the send buffer size */
if (setsockopt(s->fd, SOL_SOCKET, SO_SNDBUF, &bufsz, sizeof bufsz) == -1)
log_Printf(LogERROR, "setsockopt(SO_SNDBUF, %d): %s\n", bufsz,
strerror(errno));
umask(mask);
if (ID0connect_un(s->fd, &s->socket) < 0) {
log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n",
s->socket.sun_path, strerror(errno));
if (errno == ECONNREFUSED)
log_Printf(LogPHASE, " The previous server died badly !\n");
close(s->fd);
s->fd = -1;
return MPSERVER_FAILED;
}
/* Donate our link to the other guy */
return MPSERVER_CONNECTED;
}
return MPSERVER_LISTENING;
}
void
mpserver_Close(struct mpserver *s)
{
if (s->send.dl != NULL) {
bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
s->send.dl = NULL;
s->fd = -1;
} else if (s->fd >= 0) {
close(s->fd);
if (ID0unlink(s->socket.sun_path) == -1)
log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path,
strerror(errno));
memset(&s->socket, '\0', sizeof s->socket);
s->fd = -1;
}
}
void
mp_LinkLost(struct mp *mp, struct datalink *dl)
{
if (mp->seq.min_in == dl->mp.seq)
/* We've lost the link that's holding everything up ! */
mp_Assemble(mp, NULL, NULL);
}
void
mp_DeleteQueue(struct mp *mp)
{
link_DeleteQueue(&mp->link);
}
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