X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/06181bc3ee49e68339905317c5cf5b5e17c11259..47fc89d711eec0a073d9b3b293a1af901b5bd791:/print-token.c diff --git a/print-token.c b/print-token.c index 1690b3c9..ba6a8c68 100644 --- a/print-token.c +++ b/print-token.c @@ -23,31 +23,77 @@ * Further tweaked to more closely resemble print-fddi.c * Guy Harris */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.15 2002-05-29 10:06:27 guy Exp $"; -#endif #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include -#include -#include - -#include +#include #include #include #include #include "interface.h" +#include "extract.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" -#include "token.h" + +/* + * Copyright (c) 1998, Larry Lile + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#define TOKEN_HDRLEN 14 +#define TOKEN_RING_MAC_LEN 6 +#define ROUTING_SEGMENT_MAX 16 +#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80) +#define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6) +#define TOKEN_FC_LLC 1 + +#define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13) +#define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8) +#define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7) +#define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4) +#define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4) +#define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f)) +#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2)) + +struct token_header { + u_int8_t token_ac; + u_int8_t token_fc; + u_int8_t token_dhost[TOKEN_RING_MAC_LEN]; + u_int8_t token_shost[TOKEN_RING_MAC_LEN]; + u_int16_t token_rcf; + u_int16_t token_rseg[ROUTING_SEGMENT_MAX]; +}; + +static const char tstr[] = "[|token-ring]"; /* Extract src, dst addresses */ static inline void @@ -107,31 +153,20 @@ 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, seg; + u_int route_len = 0, hdr_len = TOKEN_HDRLEN; + int seg; trp = (const struct token_header *)p; if (caplen < TOKEN_HDRLEN) { - printf("[|token-ring]"); + printf("%s", tstr); return hdr_len; } + /* * 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)) { @@ -141,19 +176,28 @@ token_print(const u_char *p, u_int length, u_int caplen) if (eflag) token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); + if (caplen < TOKEN_HDRLEN + 2) { + printf("%s", tstr); + return hdr_len; + } route_len = RIF_LENGTH(trp); + hdr_len += route_len; + if (caplen < hdr_len) { + printf("%s", tstr); + 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", ntohs(trp->token_rcf)); - + printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf)); + for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) - printf(":%x", ntohs(trp->token_rseg[seg])); + printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg])); } printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); } else { @@ -162,13 +206,11 @@ token_print(const u_char *p, u_int length, u_int caplen) } /* Skip over token ring MAC header and routing information */ - hdr_len += route_len; length -= hdr_len; p += hdr_len; caplen -= hdr_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), @@ -182,7 +224,7 @@ token_print(const u_char *p, u_int length, u_int caplen) printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } - if (!xflag && !qflag) + if (!suppress_default_print) default_print(p, caplen); } } else { @@ -191,40 +233,20 @@ token_print(const u_char *p, u_int length, u_int caplen) if (!eflag) token_hdr_print(trp, length + TOKEN_HDRLEN + route_len, ESRC(&ehdr), EDST(&ehdr)); - if (!xflag && !qflag) + if (!suppress_default_print) default_print(p, caplen); } return (hdr_len); } /* - * 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' + * 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. */ -void -token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) +u_int +token_if_print(const struct pcap_pkthdr *h, const u_char *p) { - u_int caplen = h->caplen; - u_int length = h->len; - u_int hdr_len; - - ++infodelay; - ts_print(&h->ts); - - hdr_len = token_print(p, length, caplen); - - /* - * If "-x" was specified, print stuff past the Token Ring header, - * if there's anything to print. - */ - if (xflag && caplen > hdr_len) - default_print(p + hdr_len, caplen - hdr_len); - - putchar('\n'); - - --infodelay; - if (infoprint) - info(0); + return (token_print(p, h->len, h->caplen)); }