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print-wb.c revision 1.3 
      1 /*
      2  * Copyright (c) 1993, 1994, 1995, 1996
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  */
     21 
     22 #include <sys/cdefs.h>
     23 #ifndef lint
     24 #if 0
     25 static const char rcsid[] _U_ =
     26     "@(#) Header: /tcpdump/master/tcpdump/print-wb.c,v 1.33 2004-03-24 04:06:28 guy Exp  (LBL)";
     27 #else
     28 __RCSID("$NetBSD: print-wb.c,v 1.3 2013/04/06 19:33:08 christos Exp $");
     29 #endif
     30 #endif
     31 
     32 #ifdef HAVE_CONFIG_H
     33 #include "config.h"
     34 #endif
     35 
     36 #include <tcpdump-stdinc.h>
     37 
     38 #include <stdio.h>
     39 
     40 #include "interface.h"
     41 #include "addrtoname.h"
     42 #include "extract.h"
     43 
     44 /* XXX need to add byte-swapping macros! */
     45 /* XXX - you mean like the ones in "extract.h"? */
     46 
     47 /*
     48  * Largest packet size.  Everything should fit within this space.
     49  * For instance, multiline objects are sent piecewise.
     50  */
     51 #define MAXFRAMESIZE 1024
     52 
     53 /*
     54  * Multiple drawing ops can be sent in one packet.  Each one starts on a
     55  * an even multiple of DOP_ALIGN bytes, which must be a power of two.
     56  */
     57 #define DOP_ALIGN 4
     58 #define DOP_ROUNDUP(x)	((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1))
     59 #define DOP_NEXT(d)\
     60 	((struct dophdr *)((u_char *)(d) + \
     61 			  DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d)))))
     62 
     63 /*
     64  * Format of the whiteboard packet header.
     65  * The transport level header.
     66  */
     67 struct pkt_hdr {
     68 	u_int32_t ph_src;		/* site id of source */
     69 	u_int32_t ph_ts;		/* time stamp (for skew computation) */
     70 	u_int16_t ph_version;	/* version number */
     71 	u_char ph_type;		/* message type */
     72 	u_char ph_flags;	/* message flags */
     73 };
     74 
     75 /* Packet types */
     76 #define PT_DRAWOP	0	/* drawing operation */
     77 #define PT_ID		1	/* announcement packet */
     78 #define PT_RREQ		2	/* repair request */
     79 #define PT_RREP		3	/* repair reply */
     80 #define PT_KILL		4	/* terminate participation */
     81 #define PT_PREQ         5       /* page vector request */
     82 #define PT_PREP         7       /* page vector reply */
     83 
     84 #ifdef PF_USER
     85 #undef PF_USER			/* {Digital,Tru64} UNIX define this, alas */
     86 #endif
     87 
     88 /* flags */
     89 #define PF_USER		0x01	/* hint that packet has interactive data */
     90 #define PF_VIS		0x02	/* only visible ops wanted */
     91 
     92 struct PageID {
     93 	u_int32_t p_sid;		/* session id of initiator */
     94 	u_int32_t p_uid;		/* page number */
     95 };
     96 
     97 struct dophdr {
     98 	u_int32_t  dh_ts;		/* sender's timestamp */
     99 	u_int16_t	dh_len;		/* body length */
    100 	u_char	dh_flags;
    101 	u_char	dh_type;	/* body type */
    102 	/* body follows */
    103 };
    104 /*
    105  * Drawing op sub-types.
    106  */
    107 #define DT_RECT         2
    108 #define DT_LINE         3
    109 #define DT_ML           4
    110 #define DT_DEL          5
    111 #define DT_XFORM        6
    112 #define DT_ELL          7
    113 #define DT_CHAR         8
    114 #define DT_STR          9
    115 #define DT_NOP          10
    116 #define DT_PSCODE       11
    117 #define DT_PSCOMP       12
    118 #define DT_REF          13
    119 #define DT_SKIP         14
    120 #define DT_HOLE         15
    121 #define DT_MAXTYPE      15
    122 
    123 /*
    124  * A drawing operation.
    125  */
    126 struct pkt_dop {
    127 	struct PageID pd_page;	/* page that operations apply to */
    128 	u_int32_t	pd_sseq;	/* start sequence number */
    129 	u_int32_t	pd_eseq;	/* end sequence number */
    130 	/* drawing ops follow */
    131 };
    132 
    133 /*
    134  * A repair request.
    135  */
    136 struct pkt_rreq {
    137         u_int32_t pr_id;           /* source id of drawops to be repaired */
    138         struct PageID pr_page;           /* page of drawops */
    139         u_int32_t pr_sseq;         /* start seqno */
    140         u_int32_t pr_eseq;         /* end seqno */
    141 };
    142 
    143 /*
    144  * A repair reply.
    145  */
    146 struct pkt_rrep {
    147 	u_int32_t pr_id;	/* original site id of ops  */
    148 	struct pkt_dop pr_dop;
    149 	/* drawing ops follow */
    150 };
    151 
    152 struct id_off {
    153         u_int32_t id;
    154         u_int32_t off;
    155 };
    156 
    157 struct pgstate {
    158 	u_int32_t slot;
    159 	struct PageID page;
    160 	u_int16_t nid;
    161 	u_int16_t rsvd;
    162         /* seqptr's */
    163 };
    164 
    165 /*
    166  * An announcement packet.
    167  */
    168 struct pkt_id {
    169 	u_int32_t pi_mslot;
    170         struct PageID    pi_mpage;        /* current page */
    171 	struct pgstate pi_ps;
    172         /* seqptr's */
    173         /* null-terminated site name */
    174 };
    175 
    176 struct pkt_preq {
    177         struct PageID  pp_page;
    178         u_int32_t  pp_low;
    179         u_int32_t  pp_high;
    180 };
    181 
    182 struct pkt_prep {
    183         u_int32_t  pp_n;           /* size of pageid array */
    184         /* pgstate's follow */
    185 };
    186 
    187 static int
    188 wb_id(const struct pkt_id *id, u_int len)
    189 {
    190 	int i;
    191 	const char *cp;
    192 	const struct id_off *io;
    193 	char c;
    194 	int nid;
    195 
    196 	printf(" wb-id:");
    197 	if (len < sizeof(*id) || (u_char *)(id + 1) > snapend)
    198 		return (-1);
    199 	len -= sizeof(*id);
    200 
    201 	printf(" %u/%s:%u (max %u/%s:%u) ",
    202 	       EXTRACT_32BITS(&id->pi_ps.slot),
    203 	       ipaddr_string(&id->pi_ps.page.p_sid),
    204 	       EXTRACT_32BITS(&id->pi_ps.page.p_uid),
    205 	       EXTRACT_32BITS(&id->pi_mslot),
    206 	       ipaddr_string(&id->pi_mpage.p_sid),
    207 	       EXTRACT_32BITS(&id->pi_mpage.p_uid));
    208 
    209 	nid = EXTRACT_16BITS(&id->pi_ps.nid);
    210 	len -= sizeof(*io) * nid;
    211 	io = (struct id_off *)(id + 1);
    212 	cp = (char *)(io + nid);
    213 	if ((u_char *)cp + len <= snapend) {
    214 		putchar('"');
    215 		(void)fn_print((u_char *)cp, (u_char *)cp + len);
    216 		putchar('"');
    217 	}
    218 
    219 	c = '<';
    220 	for (i = 0; i < nid && (u_char *)(io + 1) <= snapend; ++io, ++i) {
    221 		printf("%c%s:%u",
    222 		    c, ipaddr_string(&io->id), EXTRACT_32BITS(&io->off));
    223 		c = ',';
    224 	}
    225 	if (i >= nid) {
    226 		printf(">");
    227 		return (0);
    228 	}
    229 	return (-1);
    230 }
    231 
    232 static int
    233 wb_rreq(const struct pkt_rreq *rreq, u_int len)
    234 {
    235 	printf(" wb-rreq:");
    236 	if (len < sizeof(*rreq) || (u_char *)(rreq + 1) > snapend)
    237 		return (-1);
    238 
    239 	printf(" please repair %s %s:%u<%u:%u>",
    240 	       ipaddr_string(&rreq->pr_id),
    241 	       ipaddr_string(&rreq->pr_page.p_sid),
    242 	       EXTRACT_32BITS(&rreq->pr_page.p_uid),
    243 	       EXTRACT_32BITS(&rreq->pr_sseq),
    244 	       EXTRACT_32BITS(&rreq->pr_eseq));
    245 	return (0);
    246 }
    247 
    248 static int
    249 wb_preq(const struct pkt_preq *preq, u_int len)
    250 {
    251 	printf(" wb-preq:");
    252 	if (len < sizeof(*preq) || (u_char *)(preq + 1) > snapend)
    253 		return (-1);
    254 
    255 	printf(" need %u/%s:%u",
    256 	       EXTRACT_32BITS(&preq->pp_low),
    257 	       ipaddr_string(&preq->pp_page.p_sid),
    258 	       EXTRACT_32BITS(&preq->pp_page.p_uid));
    259 	return (0);
    260 }
    261 
    262 static int
    263 wb_prep(const struct pkt_prep *prep, u_int len)
    264 {
    265 	int n;
    266 	const struct pgstate *ps;
    267 	const u_char *ep = snapend;
    268 
    269 	printf(" wb-prep:");
    270 	if (len < sizeof(*prep)) {
    271 		return (-1);
    272 	}
    273 	n = EXTRACT_32BITS(&prep->pp_n);
    274 	ps = (const struct pgstate *)(prep + 1);
    275 	while (--n >= 0 && (u_char *)(ps + 1) <= ep) {
    276 		const struct id_off *io, *ie;
    277 		char c = '<';
    278 
    279 		printf(" %u/%s:%u",
    280 		    EXTRACT_32BITS(&ps->slot),
    281 		    ipaddr_string(&ps->page.p_sid),
    282 		    EXTRACT_32BITS(&ps->page.p_uid));
    283 		io = (struct id_off *)(ps + 1);
    284 		for (ie = io + ps->nid; io < ie && (u_char *)(io + 1) <= ep; ++io) {
    285 			printf("%c%s:%u", c, ipaddr_string(&io->id),
    286 			    EXTRACT_32BITS(&io->off));
    287 			c = ',';
    288 		}
    289 		printf(">");
    290 		ps = (struct pgstate *)io;
    291 	}
    292 	return ((u_char *)ps <= ep? 0 : -1);
    293 }
    294 
    295 
    296 const char *dopstr[] = {
    297 	"dop-0!",
    298 	"dop-1!",
    299 	"RECT",
    300 	"LINE",
    301 	"ML",
    302 	"DEL",
    303 	"XFORM",
    304 	"ELL",
    305 	"CHAR",
    306 	"STR",
    307 	"NOP",
    308 	"PSCODE",
    309 	"PSCOMP",
    310 	"REF",
    311 	"SKIP",
    312 	"HOLE",
    313 };
    314 
    315 static int
    316 wb_dops(const struct dophdr *dh, u_int32_t ss, u_int32_t es)
    317 {
    318 	printf(" <");
    319 	for ( ; ss <= es; ++ss) {
    320 		register int t = dh->dh_type;
    321 
    322 		if (t > DT_MAXTYPE)
    323 			printf(" dop-%d!", t);
    324 		else {
    325 			printf(" %s", dopstr[t]);
    326 			if (t == DT_SKIP || t == DT_HOLE) {
    327 				u_int32_t ts = EXTRACT_32BITS(&dh->dh_ts);
    328 				printf("%d", ts - ss + 1);
    329 				if (ss > ts || ts > es) {
    330 					printf("[|]");
    331 					if (ts < ss)
    332 						return (0);
    333 				}
    334 				ss = ts;
    335 			}
    336 		}
    337 		dh = DOP_NEXT(dh);
    338 		if ((u_char *)dh > snapend) {
    339 			printf("[|wb]");
    340 			break;
    341 		}
    342 	}
    343 	printf(" >");
    344 	return (0);
    345 }
    346 
    347 static int
    348 wb_rrep(const struct pkt_rrep *rrep, u_int len)
    349 {
    350 	const struct pkt_dop *dop = &rrep->pr_dop;
    351 
    352 	printf(" wb-rrep:");
    353 	if (len < sizeof(*rrep) || (u_char *)(rrep + 1) > snapend)
    354 		return (-1);
    355 	len -= sizeof(*rrep);
    356 
    357 	printf(" for %s %s:%u<%u:%u>",
    358 	    ipaddr_string(&rrep->pr_id),
    359 	    ipaddr_string(&dop->pd_page.p_sid),
    360 	    EXTRACT_32BITS(&dop->pd_page.p_uid),
    361 	    EXTRACT_32BITS(&dop->pd_sseq),
    362 	    EXTRACT_32BITS(&dop->pd_eseq));
    363 
    364 	if (vflag)
    365 		return (wb_dops((const struct dophdr *)(dop + 1),
    366 		    EXTRACT_32BITS(&dop->pd_sseq),
    367 		    EXTRACT_32BITS(&dop->pd_eseq)));
    368 	return (0);
    369 }
    370 
    371 static int
    372 wb_drawop(const struct pkt_dop *dop, u_int len)
    373 {
    374 	printf(" wb-dop:");
    375 	if (len < sizeof(*dop) || (u_char *)(dop + 1) > snapend)
    376 		return (-1);
    377 	len -= sizeof(*dop);
    378 
    379 	printf(" %s:%u<%u:%u>",
    380 	    ipaddr_string(&dop->pd_page.p_sid),
    381 	    EXTRACT_32BITS(&dop->pd_page.p_uid),
    382 	    EXTRACT_32BITS(&dop->pd_sseq),
    383 	    EXTRACT_32BITS(&dop->pd_eseq));
    384 
    385 	if (vflag)
    386 		return (wb_dops((const struct dophdr *)(dop + 1),
    387 				EXTRACT_32BITS(&dop->pd_sseq),
    388 				EXTRACT_32BITS(&dop->pd_eseq)));
    389 	return (0);
    390 }
    391 
    392 /*
    393  * Print whiteboard multicast packets.
    394  */
    395 void
    396 wb_print(register const void *hdr, register u_int len)
    397 {
    398 	register const struct pkt_hdr *ph;
    399 
    400 	ph = (const struct pkt_hdr *)hdr;
    401 	if (len < sizeof(*ph) || (u_char *)(ph + 1) > snapend) {
    402 		printf("[|wb]");
    403 		return;
    404 	}
    405 	len -= sizeof(*ph);
    406 
    407 	if (ph->ph_flags)
    408 		printf("*");
    409 	switch (ph->ph_type) {
    410 
    411 	case PT_KILL:
    412 		printf(" wb-kill");
    413 		return;
    414 
    415 	case PT_ID:
    416 		if (wb_id((struct pkt_id *)(ph + 1), len) >= 0)
    417 			return;
    418 		break;
    419 
    420 	case PT_RREQ:
    421 		if (wb_rreq((struct pkt_rreq *)(ph + 1), len) >= 0)
    422 			return;
    423 		break;
    424 
    425 	case PT_RREP:
    426 		if (wb_rrep((struct pkt_rrep *)(ph + 1), len) >= 0)
    427 			return;
    428 		break;
    429 
    430 	case PT_DRAWOP:
    431 		if (wb_drawop((struct pkt_dop *)(ph + 1), len) >= 0)
    432 			return;
    433 		break;
    434 
    435 	case PT_PREQ:
    436 		if (wb_preq((struct pkt_preq *)(ph + 1), len) >= 0)
    437 			return;
    438 		break;
    439 
    440 	case PT_PREP:
    441 		if (wb_prep((struct pkt_prep *)(ph + 1), len) >= 0)
    442 			return;
    443 		break;
    444 
    445 	default:
    446 		printf(" wb-%d!", ph->ph_type);
    447 		return;
    448 	}
    449 }
    450