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108 lines
2.5 KiB
108 lines
2.5 KiB
/* |
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* Marko Kiiskila carnil@cs.tut.fi |
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* |
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* Tampere University of Technology - Telecommunications Laboratory |
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* |
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* Permission to use, copy, modify and distribute this |
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* software and its documentation is hereby granted, |
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* provided that both the copyright notice and this |
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* permission notice appear in all copies of the software, |
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* derivative works or modified versions, and any portions |
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* thereof, that both notices appear in supporting |
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* documentation, and that the use of this software is |
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* acknowledged in any publications resulting from using |
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* the software. |
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* |
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* TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
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* CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS |
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* SOFTWARE. |
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* |
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*/ |
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/* \summary: Classical-IP over ATM printer */ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include <string.h> |
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#include <netdissect-stdinc.h> |
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#include "netdissect.h" |
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#include "addrtoname.h" |
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static const unsigned char rfcllc[] = { |
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0xaa, /* DSAP: non-ISO */ |
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0xaa, /* SSAP: non-ISO */ |
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0x03, /* Ctrl: Unnumbered Information Command PDU */ |
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0x00, /* OUI: EtherType */ |
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0x00, |
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0x00 }; |
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static inline void |
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cip_print(netdissect_options *ndo, u_int length) |
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{ |
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/* |
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* There is no MAC-layer header, so just print the length. |
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*/ |
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ND_PRINT((ndo, "%u: ", length)); |
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} |
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/* |
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* This is the top level routine of the printer. 'p' points |
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* to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp, |
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* 'h->len' is the length of the packet off the wire, and 'h->caplen' |
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* is the number of bytes actually captured. |
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*/ |
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u_int |
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cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) |
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{ |
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u_int caplen = h->caplen; |
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u_int length = h->len; |
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size_t cmplen; |
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int llc_hdrlen; |
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cmplen = sizeof(rfcllc); |
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if (cmplen > caplen) |
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cmplen = caplen; |
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if (cmplen > length) |
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cmplen = length; |
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if (ndo->ndo_eflag) |
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cip_print(ndo, length); |
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if (cmplen == 0) { |
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ND_PRINT((ndo, "[|cip]")); |
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return 0; |
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} |
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if (memcmp(rfcllc, p, cmplen) == 0) { |
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/* |
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* LLC header is present. Try to print it & higher layers. |
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*/ |
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llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL); |
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if (llc_hdrlen < 0) { |
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/* packet type not known, print raw packet */ |
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if (!ndo->ndo_suppress_default_print) |
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ND_DEFAULTPRINT(p, caplen); |
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llc_hdrlen = -llc_hdrlen; |
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} |
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} else { |
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/* |
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* LLC header is absent; treat it as just IP. |
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*/ |
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llc_hdrlen = 0; |
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ip_print(ndo, p, length); |
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} |
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return (llc_hdrlen); |
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} |
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/* |
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* Local Variables: |
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* c-style: whitesmith |
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* c-basic-offset: 8 |
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* End: |
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*/
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