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