nexmon – Blame information for rev 1
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| Rev | Author | Line No. | Line |
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| 1 | office | 1 | /* |
| 2 | * Marko Kiiskila carnil@cs.tut.fi |
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| 3 | * |
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| 4 | * Tampere University of Technology - Telecommunications Laboratory |
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| 5 | * |
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| 6 | * Permission to use, copy, modify and distribute this |
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| 7 | * software and its documentation is hereby granted, |
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| 8 | * provided that both the copyright notice and this |
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| 9 | * permission notice appear in all copies of the software, |
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| 10 | * derivative works or modified versions, and any portions |
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| 11 | * thereof, that both notices appear in supporting |
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| 12 | * documentation, and that the use of this software is |
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| 13 | * acknowledged in any publications resulting from using |
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| 14 | * the software. |
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| 15 | * |
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| 16 | * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
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| 17 | * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
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| 18 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS |
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| 19 | * SOFTWARE. |
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| 20 | * |
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| 21 | */ |
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| 22 | |||
| 23 | #define NETDISSECT_REWORKED |
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| 24 | #ifdef HAVE_CONFIG_H |
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| 25 | #include "config.h" |
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| 26 | #endif |
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| 27 | |||
| 28 | #include <string.h> |
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| 29 | |||
| 30 | #include <tcpdump-stdinc.h> |
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| 31 | |||
| 32 | #include "interface.h" |
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| 33 | #include "addrtoname.h" |
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| 34 | |||
| 35 | #define RFC1483LLC_LEN 8 |
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| 36 | |||
| 37 | static const unsigned char rfcllc[] = { |
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| 38 | 0xaa, /* DSAP: non-ISO */ |
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| 39 | 0xaa, /* SSAP: non-ISO */ |
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| 40 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
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| 41 | 0x00, /* OUI: EtherType */ |
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| 42 | 0x00, |
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| 43 | 0x00 }; |
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| 44 | |||
| 45 | static inline void |
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| 46 | cip_print(netdissect_options *ndo, int length) |
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| 47 | { |
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| 48 | /* |
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| 49 | * There is no MAC-layer header, so just print the length. |
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| 50 | */ |
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| 51 | ND_PRINT((ndo, "%d: ", length)); |
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| 52 | } |
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| 53 | |||
| 54 | /* |
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| 55 | * This is the top level routine of the printer. 'p' points |
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| 56 | * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp, |
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| 57 | * 'h->len' is the length of the packet off the wire, and 'h->caplen' |
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| 58 | * is the number of bytes actually captured. |
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| 59 | */ |
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| 60 | u_int |
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| 61 | cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) |
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| 62 | { |
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| 63 | u_int caplen = h->caplen; |
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| 64 | u_int length = h->len; |
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| 65 | u_short extracted_ethertype; |
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| 66 | |||
| 67 | if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) { |
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| 68 | ND_PRINT((ndo, "[|cip]")); |
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| 69 | return (0); |
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| 70 | } |
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| 71 | |||
| 72 | if (ndo->ndo_eflag) |
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| 73 | cip_print(ndo, length); |
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| 74 | |||
| 75 | if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) { |
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| 76 | /* |
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| 77 | * LLC header is present. Try to print it & higher layers. |
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| 78 | */ |
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| 79 | if (llc_print(ndo, p, length, caplen, NULL, NULL, |
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| 80 | &extracted_ethertype) == 0) { |
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| 81 | /* ether_type not known, print raw packet */ |
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| 82 | if (!ndo->ndo_eflag) |
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| 83 | cip_print(ndo, length); |
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| 84 | if (extracted_ethertype) { |
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| 85 | ND_PRINT((ndo, "(LLC %s) ", |
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| 86 | etherproto_string(htons(extracted_ethertype)))); |
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| 87 | } |
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| 88 | if (!ndo->ndo_suppress_default_print) |
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| 89 | ND_DEFAULTPRINT(p, caplen); |
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| 90 | } |
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| 91 | } else { |
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| 92 | /* |
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| 93 | * LLC header is absent; treat it as just IP. |
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| 94 | */ |
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| 95 | ip_print(ndo, p, length); |
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| 96 | } |
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| 97 | |||
| 98 | return (0); |
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| 99 | } |
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| 100 | |||
| 101 | |||
| 102 | /* |
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| 103 | * Local Variables: |
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| 104 | * c-style: whitesmith |
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| 105 | * c-basic-offset: 8 |
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| 106 | * End: |
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| 107 | */ |