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9c53a7b1c5
freebsd/usr.sbin/ppp/mp.c
Brian Somers 9c53a7b1c5 o Display current link throughput in `show links' (assuming 
throughput measurement is enabled).
o Load balance the links based on weight *and* on a round-robin
  basis.  This makes things fairly even on an output basis.  We
  don't try to allow for the peer sending all his data down one
  link (and try to send ours back up the other).
o Show the number of pending input buffers that can't be processed
  in ``show mp''.
o Fix a typo in the man page.
1998-05-03 22:13:14 +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.
*
* $Id: mp.c,v 1.1.2.20 1998/05/02 21:57:49 brian Exp $
*/
#include <sys/types.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 "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "ipcp.h"
#include "auth.h"
#include "lcp.h"
#include "lqr.h"
#include "hdlc.h"
#include "async.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "chat.h"
#include "lcpproto.h"
#include "filter.h"
#include "mp.h"
#include "chap.h"
#include "datalink.h"
#include "bundle.h"
#include "ip.h"
#include "prompt.h"
#include "id.h"
#include "arp.h"
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(struct mp *mp, u_int32_t seq)
{
seq++;
if (mp->peer_is12bit) {
if (seq & 0xfffff000)
seq = 0;
} else if (seq & 0xff000000)
seq = 0;
return seq;
}
static int
mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
{
if (mp->local_is12bit) {
header->seq = ntohs(*(u_int16_t *)MBUF_CTOP(m));
if (header->seq & 0x3000) {
log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
return 0;
}
header->begin = header->seq & 0x8000 ? 1 : 0;
header->end = header->seq & 0x4000 ? 1 : 0;
header->seq &= 0x0fff;
return 2;
} else {
header->seq = ntohl(*(u_int32_t *)MBUF_CTOP(m));
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 */
}
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 = MP_LINK;
mp->link.name = "mp";
mp->link.len = sizeof *mp;
throughput_init(&mp->link.throughput);
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.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);
}
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_init(&mp->link.throughput);
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 */
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;
/* Don't want any more of these */
mpserver_Close(&mp->server);
/* CCP goes down with a bang */
fsm_Down(&mp->link.ccp.fsm);
fsm_Close(&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->weight = 1500;
}
void
mp_Input(struct mp *mp, struct mbuf *m, struct physical *p)
{
struct mp_header mh, h;
struct mbuf *q, *last;
int32_t seq;
if (mp_ReadHeader(mp, m, &mh) == 0) {
mbuf_Free(m);
return;
}
seq = p->dl->mp.seq;
p->dl->mp.seq = mh.seq;
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 = p->dl->mp.seq;
for (dl = mp->bundle->links; dl; dl = dl->next)
if (mp->seq.min_in > dl->mp.seq)
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 && h.seq > mh.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 (mp->seq.min_in > seq) {
/* 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 && (h.seq >= mp->seq.min_in || 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 = h.seq + 1;
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) {
u_short proto;
u_char ch;
q = mbuf_Read(q, &ch, 1);
proto = ch;
if (!(proto & 1)) {
q = mbuf_Read(q, &ch, 1);
proto <<= 8;
proto += ch;
}
if (log_IsKept(LogDEBUG))
log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n",
first, (u_long)h.seq, mbuf_Length(q));
hdlc_DecodePacket(mp->bundle, proto, q, &mp->link);
}
mp->seq.next_in = seq = h.seq + 1;
last = NULL;
q = mp->inbufs;
} else {
/* Look for the next fragment */
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 (h.seq > mh.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;
break;
}
}
}
}
static void
mp_Output(struct mp *mp, struct link *l, struct mbuf *m, int begin, int end)
{
struct mbuf *mo;
/* Stuff an MP header on the front of our packet and send it */
mo = mbuf_Alloc(4, MB_MP);
mo->next = m;
if (mp->peer_is12bit) {
u_int16_t *seq16;
seq16 = (u_int16_t *)MBUF_CTOP(mo);
*seq16 = htons((begin << 15) | (end << 14) | (u_int16_t)mp->out.seq);
mo->cnt = 2;
} else {
u_int32_t *seq32;
seq32 = (u_int32_t *)MBUF_CTOP(mo);
*seq32 = htonl((begin << 31) | (end << 30) | (u_int32_t)mp->out.seq);
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, mp->out.seq);
hdlc_Output(l, PRI_NORMAL, PROTO_MP, mo);
}
int
mp_FillQueues(struct bundle *bundle)
{
struct mp *mp = &bundle->ncp.mp;
struct datalink *dl, *fdl;
int total, add, len, begin, end, thislink, nlinks;
struct mbuf *m, *mo;
thislink = nlinks = 0;
for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
if (!fdl) {
if (thislink == mp->out.link)
fdl = dl;
else
thislink++;
}
nlinks++;
}
if (!fdl) {
fdl = bundle->links;
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_FlushPacket(&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) {
if (len <= dl->mp.weight + LINK_MINWEIGHT) {
/*
* XXX: Should we remember how much of our `weight' wasn't sent
* so that we can compensate next time ?
*/
mo = m;
end = 1;
} else {
mo = mbuf_Alloc(dl->mp.weight, MB_MP);
mo->cnt = dl->mp.weight;
len -= mo->cnt;
m = mbuf_Read(m, MBUF_CTOP(mo), mo->cnt);
}
mp_Output(mp, &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_SetDatalinkWeight(struct cmdargs const *arg)
{
int val;
if (arg->argc != arg->argn+1)
return -1;
val = atoi(arg->argv[arg->argn]);
if (val < LINK_MINWEIGHT) {
log_Printf(LogWARN, "Link weights must not be less than %d\n",
LINK_MINWEIGHT);
return 1;
}
arg->cx->mp.weight = val;
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;
int bufs = 0;
prompt_Printf(arg->prompt, "Socket: %s\n",
mp->server.socket.sun_path);
for (m = mp->inbufs; m; m = m->pnext)
bufs++;
prompt_Printf(arg->prompt, "Pending frags: %d\n", bufs);
}
prompt_Printf(arg->prompt, "\nMy Side:\n");
if (mp->active) {
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, " Next SEQ: %u\n", mp->out.seq);
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));
return 0;
}
const char *
mp_Enddisc(u_char c, const char *address, int len)
{
static char result[100];
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;
if (bundle_Phase(arg->bundle) != PHASE_DEAD) {
log_Printf(LogWARN, "set enddisc: Only available at phase DEAD\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);
if (s->send.dl != NULL) {
/* We've connect()ed */
bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
s->send.dl = NULL;
close(s->fd);
s->fd = -1;
} else if (r && s->fd >= 0) {
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
return 1;
}
return 0;
}
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);
struct sockaddr in;
int fd, size;
size = sizeof in;
fd = accept(s->fd, &in, &size);
if (fd < 0) {
log_Printf(LogERROR, "mpserver_Read: accept(): %s\n", strerror(errno));
return;
}
if (in.sa_family == AF_LOCAL) /* ??? */
bundle_ReceiveDatalink(bundle, fd, (struct sockaddr_un *)&in);
close(fd);
}
static void
mpserver_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
{
/* We never want to write here ! */
log_Printf(LogERROR, "mpserver_Write: Internal error: Bad call !\n");
}
void
mpserver_Init(struct mpserver *s)
{
s->desc.type = MPSERVER_DESCRIPTOR;
s->desc.next = NULL;
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;
mode_t mask;
if (s->fd != -1) {
log_Printf(LogERROR, "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_STREAM, 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);
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;
}
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, " Has 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;
}
/* Listen for other ppp invocations that want to donate links */
if (listen(s->fd, 5) != 0) {
log_Printf(LogERROR, "mpserver: Unable to listen to socket"
" - BUNDLE overload?\n");
mpserver_Close(s);
}
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;
close(s->fd);
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;
}
}
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