/* * 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. */ /* \summary: White Board printer */ #ifdef HAVE_CONFIG_H #include #endif #include "netdissect-stdinc.h" #include "netdissect.h" #include "addrtoname.h" #include "extract.h" /* 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)\ ((const struct dophdr *)((const u_char *)(d) + \ DOP_ROUNDUP(EXTRACT_BE_U_2((d)->dh_len) + sizeof(*(d))))) /* * Format of the whiteboard packet header. * The transport level header. */ struct pkt_hdr { nd_uint32_t ph_src; /* site id of source */ nd_uint32_t ph_ts; /* time stamp (for skew computation) */ nd_uint16_t ph_version; /* version number */ nd_uint8_t ph_type; /* message type */ nd_uint8_t 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 { nd_uint32_t p_sid; /* session id of initiator */ nd_uint32_t p_uid; /* page number */ }; struct dophdr { nd_uint32_t dh_ts; /* sender's timestamp */ nd_uint16_t dh_len; /* body length */ nd_uint8_t dh_flags; nd_uint8_t 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 */ nd_uint32_t pd_sseq; /* start sequence number */ nd_uint32_t pd_eseq; /* end sequence number */ /* drawing ops follow */ }; /* * A repair request. */ struct pkt_rreq { nd_uint32_t pr_id; /* source id of drawops to be repaired */ struct PageID pr_page; /* page of drawops */ nd_uint32_t pr_sseq; /* start seqno */ nd_uint32_t pr_eseq; /* end seqno */ }; /* * A repair reply. */ struct pkt_rrep { nd_uint32_t pr_id; /* original site id of ops */ struct pkt_dop pr_dop; /* drawing ops follow */ }; struct id_off { nd_uint32_t id; nd_uint32_t off; }; struct pgstate { nd_uint32_t slot; struct PageID page; nd_uint16_t nid; nd_uint16_t rsvd; /* seqptr's */ }; /* * An announcement packet. */ struct pkt_id { nd_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; nd_uint32_t pp_low; nd_uint32_t pp_high; }; struct pkt_prep { nd_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) { u_int i; const char *cp; const struct id_off *io; char c; u_int nid; ND_PRINT(" wb-id:"); if (len < sizeof(*id) || !ND_TTEST_SIZE(id)) return (-1); len -= sizeof(*id); ND_PRINT(" %u/%s:%u (max %u/%s:%u) ", EXTRACT_BE_U_4(id->pi_ps.slot), ipaddr_string(ndo, id->pi_ps.page.p_sid), EXTRACT_BE_U_4(id->pi_ps.page.p_uid), EXTRACT_BE_U_4(id->pi_mslot), ipaddr_string(ndo, id->pi_mpage.p_sid), EXTRACT_BE_U_4(id->pi_mpage.p_uid)); nid = EXTRACT_BE_U_2(id->pi_ps.nid); len -= sizeof(*io) * nid; io = (const struct id_off *)(id + 1); cp = (const char *)(io + nid); if (ND_TTEST_LEN(cp, len)) { ND_PRINT("\""); nd_print(ndo, (const u_char *)cp, (const u_char *)cp + len); ND_PRINT("\""); } c = '<'; for (i = 0; i < nid && ND_TTEST_SIZE(io); ++io, ++i) { ND_PRINT("%c%s:%u", c, ipaddr_string(ndo, io->id), EXTRACT_BE_U_4(io->off)); c = ','; } if (i >= nid) { ND_PRINT(">"); return (0); } return (-1); } static int wb_rreq(netdissect_options *ndo, const struct pkt_rreq *rreq, u_int len) { ND_PRINT(" wb-rreq:"); if (len < sizeof(*rreq) || !ND_TTEST_SIZE(rreq)) return (-1); ND_PRINT(" please repair %s %s:%u<%u:%u>", ipaddr_string(ndo, rreq->pr_id), ipaddr_string(ndo, rreq->pr_page.p_sid), EXTRACT_BE_U_4(rreq->pr_page.p_uid), EXTRACT_BE_U_4(rreq->pr_sseq), EXTRACT_BE_U_4(rreq->pr_eseq)); return (0); } static int wb_preq(netdissect_options *ndo, const struct pkt_preq *preq, u_int len) { ND_PRINT(" wb-preq:"); if (len < sizeof(*preq) || !ND_TTEST_SIZE(preq)) return (-1); ND_PRINT(" need %u/%s:%u", EXTRACT_BE_U_4(preq->pp_low), ipaddr_string(ndo, preq->pp_page.p_sid), EXTRACT_BE_U_4(preq->pp_page.p_uid)); return (0); } static int wb_prep(netdissect_options *ndo, const struct pkt_prep *prep, u_int len) { u_int n; const struct pgstate *ps; const u_char *ep = ndo->ndo_snapend; ND_PRINT(" wb-prep:"); if (len < sizeof(*prep) || !ND_TTEST_SIZE(prep)) return (-1); n = EXTRACT_BE_U_4(prep->pp_n); ps = (const struct pgstate *)(prep + 1); while (n != 0 && ND_TTEST_SIZE(ps)) { const struct id_off *io, *ie; char c = '<'; ND_PRINT(" %u/%s:%u", EXTRACT_BE_U_4(ps->slot), ipaddr_string(ndo, ps->page.p_sid), EXTRACT_BE_U_4(ps->page.p_uid)); io = (const struct id_off *)(ps + 1); for (ie = io + EXTRACT_U_1(ps->nid); io < ie && ND_TTEST_SIZE(io); ++io) { ND_PRINT("%c%s:%u", c, ipaddr_string(ndo, io->id), EXTRACT_BE_U_4(io->off)); c = ','; } ND_PRINT(">"); ps = (const struct pgstate *)io; n--; } return ((const 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(" <"); for ( ; ss <= es; ++ss) { u_int t; if (!ND_TTEST_SIZE(dh)) { nd_print_trunc(ndo); break; } t = EXTRACT_U_1(dh->dh_type); if (t > DT_MAXTYPE) ND_PRINT(" dop-%u!", t); else { ND_PRINT(" %s", dopstr[t]); if (t == DT_SKIP || t == DT_HOLE) { uint32_t ts = EXTRACT_BE_U_4(dh->dh_ts); ND_PRINT("%u", ts - ss + 1); if (ss > ts || ts > es) { ND_PRINT("[|]"); if (ts < ss) return (0); } ss = ts; } } dh = DOP_NEXT(dh); } ND_PRINT(" >"); 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(" wb-rrep:"); if (len < sizeof(*rrep) || !ND_TTEST_SIZE(rrep)) return (-1); len -= sizeof(*rrep); ND_PRINT(" for %s %s:%u<%u:%u>", ipaddr_string(ndo, rrep->pr_id), ipaddr_string(ndo, dop->pd_page.p_sid), EXTRACT_BE_U_4(dop->pd_page.p_uid), EXTRACT_BE_U_4(dop->pd_sseq), EXTRACT_BE_U_4(dop->pd_eseq)); if (ndo->ndo_vflag) return (wb_dops(ndo, dop, EXTRACT_BE_U_4(dop->pd_sseq), EXTRACT_BE_U_4(dop->pd_eseq))); return (0); } static int wb_drawop(netdissect_options *ndo, const struct pkt_dop *dop, u_int len) { ND_PRINT(" wb-dop:"); if (len < sizeof(*dop) || !ND_TTEST_SIZE(dop)) return (-1); len -= sizeof(*dop); ND_PRINT(" %s:%u<%u:%u>", ipaddr_string(ndo, dop->pd_page.p_sid), EXTRACT_BE_U_4(dop->pd_page.p_uid), EXTRACT_BE_U_4(dop->pd_sseq), EXTRACT_BE_U_4(dop->pd_eseq)); if (ndo->ndo_vflag) return (wb_dops(ndo, dop, EXTRACT_BE_U_4(dop->pd_sseq), EXTRACT_BE_U_4(dop->pd_eseq))); return (0); } /* * Print whiteboard multicast packets. */ void wb_print(netdissect_options *ndo, const u_char *hdr, u_int len) { const struct pkt_hdr *ph; uint8_t type; ndo->ndo_protocol = "wb"; ph = (const struct pkt_hdr *)hdr; if (len < sizeof(*ph) || !ND_TTEST_SIZE(ph)) { nd_print_trunc(ndo); return; } len -= sizeof(*ph); if (EXTRACT_U_1(ph->ph_flags)) ND_PRINT("*"); type = EXTRACT_U_1(ph->ph_type); switch (type) { case PT_KILL: ND_PRINT(" wb-kill"); return; case PT_ID: if (wb_id(ndo, (const struct pkt_id *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; case PT_RREQ: if (wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; case PT_RREP: if (wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; case PT_DRAWOP: if (wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; case PT_PREQ: if (wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; case PT_PREP: if (wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len) >= 0) return; nd_print_trunc(ndo); break; default: ND_PRINT(" wb-%u!", type); return; } }