nexmon – Rev 1
?pathlinks?
/*
* Copyright (c) 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
static const char tstr[] = "[|wb]";
/* XXX need to add byte-swapping macros! */
/* XXX - you mean like the ones in "extract.h"? */
/*
* Largest packet size. Everything should fit within this space.
* For instance, multiline objects are sent piecewise.
*/
#define MAXFRAMESIZE 1024
/*
* Multiple drawing ops can be sent in one packet. Each one starts on a
* an even multiple of DOP_ALIGN bytes, which must be a power of two.
*/
#define DOP_ALIGN 4
#define DOP_ROUNDUP(x) ((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1))
#define DOP_NEXT(d)\
((struct dophdr *)((u_char *)(d) + \
DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d)))))
/*
* Format of the whiteboard packet header.
* The transport level header.
*/
struct pkt_hdr {
uint32_t ph_src; /* site id of source */
uint32_t ph_ts; /* time stamp (for skew computation) */
uint16_t ph_version; /* version number */
u_char ph_type; /* message type */
u_char ph_flags; /* message flags */
};
/* Packet types */
#define PT_DRAWOP 0 /* drawing operation */
#define PT_ID 1 /* announcement packet */
#define PT_RREQ 2 /* repair request */
#define PT_RREP 3 /* repair reply */
#define PT_KILL 4 /* terminate participation */
#define PT_PREQ 5 /* page vector request */
#define PT_PREP 7 /* page vector reply */
#ifdef PF_USER
#undef PF_USER /* {Digital,Tru64} UNIX define this, alas */
#endif
/* flags */
#define PF_USER 0x01 /* hint that packet has interactive data */
#define PF_VIS 0x02 /* only visible ops wanted */
struct PageID {
uint32_t p_sid; /* session id of initiator */
uint32_t p_uid; /* page number */
};
struct dophdr {
uint32_t dh_ts; /* sender's timestamp */
uint16_t dh_len; /* body length */
u_char dh_flags;
u_char dh_type; /* body type */
/* body follows */
};
/*
* Drawing op sub-types.
*/
#define DT_RECT 2
#define DT_LINE 3
#define DT_ML 4
#define DT_DEL 5
#define DT_XFORM 6
#define DT_ELL 7
#define DT_CHAR 8
#define DT_STR 9
#define DT_NOP 10
#define DT_PSCODE 11
#define DT_PSCOMP 12
#define DT_REF 13
#define DT_SKIP 14
#define DT_HOLE 15
#define DT_MAXTYPE 15
/*
* A drawing operation.
*/
struct pkt_dop {
struct PageID pd_page; /* page that operations apply to */
uint32_t pd_sseq; /* start sequence number */
uint32_t pd_eseq; /* end sequence number */
/* drawing ops follow */
};
/*
* A repair request.
*/
struct pkt_rreq {
uint32_t pr_id; /* source id of drawops to be repaired */
struct PageID pr_page; /* page of drawops */
uint32_t pr_sseq; /* start seqno */
uint32_t pr_eseq; /* end seqno */
};
/*
* A repair reply.
*/
struct pkt_rrep {
uint32_t pr_id; /* original site id of ops */
struct pkt_dop pr_dop;
/* drawing ops follow */
};
struct id_off {
uint32_t id;
uint32_t off;
};
struct pgstate {
uint32_t slot;
struct PageID page;
uint16_t nid;
uint16_t rsvd;
/* seqptr's */
};
/*
* An announcement packet.
*/
struct pkt_id {
uint32_t pi_mslot;
struct PageID pi_mpage; /* current page */
struct pgstate pi_ps;
/* seqptr's */
/* null-terminated site name */
};
struct pkt_preq {
struct PageID pp_page;
uint32_t pp_low;
uint32_t pp_high;
};
struct pkt_prep {
uint32_t pp_n; /* size of pageid array */
/* pgstate's follow */
};
static int
wb_id(netdissect_options *ndo,
const struct pkt_id *id, u_int len)
{
int i;
const char *cp;
const struct id_off *io;
char c;
int nid;
ND_PRINT((ndo, " wb-id:"));
if (len < sizeof(*id) || !ND_TTEST(*id))
return (-1);
len -= sizeof(*id);
ND_PRINT((ndo, " %u/%s:%u (max %u/%s:%u) ",
EXTRACT_32BITS(&id->pi_ps.slot),
ipaddr_string(ndo, &id->pi_ps.page.p_sid),
EXTRACT_32BITS(&id->pi_ps.page.p_uid),
EXTRACT_32BITS(&id->pi_mslot),
ipaddr_string(ndo, &id->pi_mpage.p_sid),
EXTRACT_32BITS(&id->pi_mpage.p_uid)));
nid = EXTRACT_16BITS(&id->pi_ps.nid);
len -= sizeof(*io) * nid;
io = (struct id_off *)(id + 1);
cp = (char *)(io + nid);
if (ND_TTEST2(cp, len)) {
ND_PRINT((ndo, "\""));
fn_print(ndo, (u_char *)cp, (u_char *)cp + len);
ND_PRINT((ndo, "\""));
}
c = '<';
for (i = 0; i < nid && ND_TTEST(*io); ++io, ++i) {
ND_PRINT((ndo, "%c%s:%u",
c, ipaddr_string(ndo, &io->id), EXTRACT_32BITS(&io->off)));
c = ',';
}
if (i >= nid) {
ND_PRINT((ndo, ">"));
return (0);
}
return (-1);
}
static int
wb_rreq(netdissect_options *ndo,
const struct pkt_rreq *rreq, u_int len)
{
ND_PRINT((ndo, " wb-rreq:"));
if (len < sizeof(*rreq) || !ND_TTEST(*rreq))
return (-1);
ND_PRINT((ndo, " please repair %s %s:%u<%u:%u>",
ipaddr_string(ndo, &rreq->pr_id),
ipaddr_string(ndo, &rreq->pr_page.p_sid),
EXTRACT_32BITS(&rreq->pr_page.p_uid),
EXTRACT_32BITS(&rreq->pr_sseq),
EXTRACT_32BITS(&rreq->pr_eseq)));
return (0);
}
static int
wb_preq(netdissect_options *ndo,
const struct pkt_preq *preq, u_int len)
{
ND_PRINT((ndo, " wb-preq:"));
if (len < sizeof(*preq) || !ND_TTEST(*preq))
return (-1);
ND_PRINT((ndo, " need %u/%s:%u",
EXTRACT_32BITS(&preq->pp_low),
ipaddr_string(ndo, &preq->pp_page.p_sid),
EXTRACT_32BITS(&preq->pp_page.p_uid)));
return (0);
}
static int
wb_prep(netdissect_options *ndo,
const struct pkt_prep *prep, u_int len)
{
int n;
const struct pgstate *ps;
const u_char *ep = ndo->ndo_snapend;
ND_PRINT((ndo, " wb-prep:"));
if (len < sizeof(*prep)) {
return (-1);
}
n = EXTRACT_32BITS(&prep->pp_n);
ps = (const struct pgstate *)(prep + 1);
while (--n >= 0 && ND_TTEST(*ps)) {
const struct id_off *io, *ie;
char c = '<';
ND_PRINT((ndo, " %u/%s:%u",
EXTRACT_32BITS(&ps->slot),
ipaddr_string(ndo, &ps->page.p_sid),
EXTRACT_32BITS(&ps->page.p_uid)));
io = (struct id_off *)(ps + 1);
for (ie = io + ps->nid; io < ie && ND_TTEST(*io); ++io) {
ND_PRINT((ndo, "%c%s:%u", c, ipaddr_string(ndo, &io->id),
EXTRACT_32BITS(&io->off)));
c = ',';
}
ND_PRINT((ndo, ">"));
ps = (struct pgstate *)io;
}
return ((u_char *)ps <= ep? 0 : -1);
}
static const char *dopstr[] = {
"dop-0!",
"dop-1!",
"RECT",
"LINE",
"ML",
"DEL",
"XFORM",
"ELL",
"CHAR",
"STR",
"NOP",
"PSCODE",
"PSCOMP",
"REF",
"SKIP",
"HOLE",
};
static int
wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
uint32_t ss, uint32_t es)
{
const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
ND_PRINT((ndo, " <"));
for ( ; ss <= es; ++ss) {
int t;
if (!ND_TTEST(*dh)) {
ND_PRINT((ndo, "%s", tstr));
break;
}
t = dh->dh_type;
if (t > DT_MAXTYPE)
ND_PRINT((ndo, " dop-%d!", t));
else {
ND_PRINT((ndo, " %s", dopstr[t]));
if (t == DT_SKIP || t == DT_HOLE) {
uint32_t ts = EXTRACT_32BITS(&dh->dh_ts);
ND_PRINT((ndo, "%d", ts - ss + 1));
if (ss > ts || ts > es) {
ND_PRINT((ndo, "[|]"));
if (ts < ss)
return (0);
}
ss = ts;
}
}
dh = DOP_NEXT(dh);
}
ND_PRINT((ndo, " >"));
return (0);
}
static int
wb_rrep(netdissect_options *ndo,
const struct pkt_rrep *rrep, u_int len)
{
const struct pkt_dop *dop = &rrep->pr_dop;
ND_PRINT((ndo, " wb-rrep:"));
if (len < sizeof(*rrep) || !ND_TTEST(*rrep))
return (-1);
len -= sizeof(*rrep);
ND_PRINT((ndo, " for %s %s:%u<%u:%u>",
ipaddr_string(ndo, &rrep->pr_id),
ipaddr_string(ndo, &dop->pd_page.p_sid),
EXTRACT_32BITS(&dop->pd_page.p_uid),
EXTRACT_32BITS(&dop->pd_sseq),
EXTRACT_32BITS(&dop->pd_eseq)));
if (ndo->ndo_vflag)
return (wb_dops(ndo, dop,
EXTRACT_32BITS(&dop->pd_sseq),
EXTRACT_32BITS(&dop->pd_eseq)));
return (0);
}
static int
wb_drawop(netdissect_options *ndo,
const struct pkt_dop *dop, u_int len)
{
ND_PRINT((ndo, " wb-dop:"));
if (len < sizeof(*dop) || !ND_TTEST(*dop))
return (-1);
len -= sizeof(*dop);
ND_PRINT((ndo, " %s:%u<%u:%u>",
ipaddr_string(ndo, &dop->pd_page.p_sid),
EXTRACT_32BITS(&dop->pd_page.p_uid),
EXTRACT_32BITS(&dop->pd_sseq),
EXTRACT_32BITS(&dop->pd_eseq)));
if (ndo->ndo_vflag)
return (wb_dops(ndo, dop,
EXTRACT_32BITS(&dop->pd_sseq),
EXTRACT_32BITS(&dop->pd_eseq)));
return (0);
}
/*
* Print whiteboard multicast packets.
*/
void
wb_print(netdissect_options *ndo,
register const void *hdr, register u_int len)
{
register const struct pkt_hdr *ph;
ph = (const struct pkt_hdr *)hdr;
if (len < sizeof(*ph) || !ND_TTEST(*ph)) {
ND_PRINT((ndo, "%s", tstr));
return;
}
len -= sizeof(*ph);
if (ph->ph_flags)
ND_PRINT((ndo, "*"));
switch (ph->ph_type) {
case PT_KILL:
ND_PRINT((ndo, " wb-kill"));
return;
case PT_ID:
if (wb_id(ndo, (struct pkt_id *)(ph + 1), len) >= 0)
return;
break;
case PT_RREQ:
if (wb_rreq(ndo, (struct pkt_rreq *)(ph + 1), len) >= 0)
return;
break;
case PT_RREP:
if (wb_rrep(ndo, (struct pkt_rrep *)(ph + 1), len) >= 0)
return;
break;
case PT_DRAWOP:
if (wb_drawop(ndo, (struct pkt_dop *)(ph + 1), len) >= 0)
return;
break;
case PT_PREQ:
if (wb_preq(ndo, (struct pkt_preq *)(ph + 1), len) >= 0)
return;
break;
case PT_PREP:
if (wb_prep(ndo, (struct pkt_prep *)(ph + 1), len) >= 0)
return;
break;
default:
ND_PRINT((ndo, " wb-%d!", ph->ph_type));
return;
}
}