/* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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. * * Hacked version of print-ether.c Larry Lile * * Further tweaked to more closely resemble print-fddi.c * Guy Harris * * $FreeBSD$ */ #ifndef lint static const char rcsid[] = "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.13 2001/09/18 15:46:37 fenner Exp $"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" #include "token.h" /* Extract src, dst addresses */ static inline void extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) { memcpy(fdst, (const char *)trp->token_dhost, 6); memcpy(fsrc, (const char *)trp->token_shost, 6); } /* * Print the TR MAC header */ static inline void token_print(register const struct token_header *trp, register u_int length, register const u_char *fsrc, register const u_char *fdst) { const char *srcname, *dstname; srcname = etheraddr_string(fsrc); dstname = etheraddr_string(fdst); if (vflag) (void) printf("%02x %02x %s %s %d: ", trp->token_ac, trp->token_fc, srcname, dstname, length); else printf("%s %s %d: ", srcname, dstname, length); } static const char *broadcast_indicator[] = { "Non-Broadcast", "Non-Broadcast", "Non-Broadcast", "Non-Broadcast", "All-routes", "All-routes", "Single-route", "Single-route" }; static const char *direction[] = { "Forward", "Backward" }; static const char *largest_frame[] = { "516", "1500", "2052", "4472", "8144", "11407", "17800", "??" }; /* * This is the top level routine of the printer. 'p' is the points * to the TR header of the packet, 'tvp' is the timestamp, * 'length' is the length of the packet off the wire, and 'caplen' * is the number of bytes actually captured. */ void token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; const struct token_header *trp; u_short extracted_ethertype; struct ether_header ehdr; u_int route_len = 0, seg; trp = (const struct token_header *)p; ++infodelay; ts_print(&h->ts); if (caplen < TOKEN_HDRLEN) { printf("[|token-ring]"); goto out; } /* * Get the TR addresses into a canonical form */ extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); /* * Some printers want to get back at the ethernet addresses, * and/or check that they're not walking off the end of the packet. * Rather than pass them all the way down, we set these globals. */ snapend = p + caplen; /* * Actually, the only printers that use packetp are print-arp.c * and print-bootp.c, and they assume that packetp points to an * Ethernet header. The right thing to do is to fix them to know * which link type is in use when they excavate. XXX */ packetp = (u_char *)&ehdr; /* Adjust for source routing information in the MAC header */ if (IS_SOURCE_ROUTED(trp)) { /* Clear source-routed bit */ *ESRC(&ehdr) &= 0x7f; if (eflag) token_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); route_len = RIF_LENGTH(trp); if (vflag) { printf("%s ", broadcast_indicator[BROADCAST(trp)]); printf("%s", direction[DIRECTION(trp)]); for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) printf(" [%d:%d]", RING_NUMBER(trp, seg), BRIDGE_NUMBER(trp, seg)); } else { printf("rt = %x", ntohs(trp->token_rcf)); for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) printf(":%x", ntohs(trp->token_rseg[seg])); } printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); } else { if (eflag) token_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); } /* Skip over token ring MAC header and routing information */ length -= TOKEN_HDRLEN + route_len; p += TOKEN_HDRLEN + route_len; caplen -= TOKEN_HDRLEN + route_len; /* Frame Control field determines interpretation of packet */ extracted_ethertype = 0; if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { /* Try to print the LLC-layer header & higher layers */ if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), &extracted_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) token_print(trp, length + TOKEN_HDRLEN + route_len, ESRC(&ehdr), EDST(&ehdr)); if (extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p, caplen); } } else { /* Some kinds of TR packet we cannot handle intelligently */ /* XXX - dissect MAC packets if frame type is 0 */ if (!eflag) token_print(trp, length + TOKEN_HDRLEN + route_len, ESRC(&ehdr), EDST(&ehdr)); if (!xflag && !qflag) default_print(p, caplen); } if (xflag) default_print(p, caplen); out: putchar('\n'); --infodelay; if (infoprint) info(0); }