diff options
Diffstat (limited to 'print-token.c')
| -rw-r--r-- | print-token.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/print-token.c b/print-token.c new file mode 100644 index 0000000..4f8422b --- /dev/null +++ b/print-token.c @@ -0,0 +1,203 @@ +/* + * 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 <lile@stdio.com> + * + * Further tweaked to more closely resemble print-fddi.c + * Guy Harris <guy@alum.mit.edu> + */ +#ifndef lint +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <pcap.h> +#include <stdio.h> +#include <string.h> + +#include "interface.h" +#include "extract.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_hdr_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", + "??" +}; + +u_int +token_print(const u_char *p, u_int length, u_int caplen) +{ + const struct token_header *trp; + u_short extracted_ethertype; + struct ether_header ehdr; + u_int route_len = 0, hdr_len = TOKEN_HDRLEN; + int seg; + + trp = (const struct token_header *)p; + + if (caplen < TOKEN_HDRLEN) { + printf("[|token-ring]"); + return hdr_len; + } + + /* + * Get the TR addresses into a canonical form + */ + extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&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_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); + + if (caplen < TOKEN_HDRLEN + 2) { + printf("[|token-ring]"); + return hdr_len; + } + route_len = RIF_LENGTH(trp); + hdr_len += route_len; + if (caplen < hdr_len) { + printf("[|token-ring]"); + return hdr_len; + } + 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", EXTRACT_16BITS(&trp->token_rcf)); + + for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) + printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg])); + } + printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); + } else { + if (eflag) + token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); + } + + /* Skip over token ring MAC header and routing information */ + length -= hdr_len; + p += hdr_len; + caplen -= hdr_len; + + /* Frame Control field determines interpretation of packet */ + 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_hdr_print(trp, + length + TOKEN_HDRLEN + route_len, + ESRC(&ehdr), EDST(&ehdr)); + if (extracted_ethertype) { + printf("(LLC %s) ", + etherproto_string(htons(extracted_ethertype))); + } + if (!suppress_default_print) + 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_hdr_print(trp, length + TOKEN_HDRLEN + route_len, + ESRC(&ehdr), EDST(&ehdr)); + if (!suppress_default_print) + default_print(p, caplen); + } + return (hdr_len); +} + +/* + * This is the top level routine of the printer. 'p' points + * to the TR header of the packet, 'h->ts' is the timestamp, + * 'h->len' is the length of the packet off the wire, and 'h->caplen' + * is the number of bytes actually captured. + */ +u_int +token_if_print(const struct pcap_pkthdr *h, const u_char *p) +{ + return (token_print(p, h->len, h->caplen)); +} |