diff options
Diffstat (limited to 'contrib/tcpdump/print-dtp.c')
-rw-r--r-- | contrib/tcpdump/print-dtp.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-dtp.c b/contrib/tcpdump/print-dtp.c new file mode 100644 index 0000000..c358a89 --- /dev/null +++ b/contrib/tcpdump/print-dtp.c @@ -0,0 +1,123 @@ +/* + * Copyright (c) 1998-2007 The TCPDUMP project + * + * 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, and (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. + * 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. + * + * Dynamic Trunk Protocol (DTP) + * + * Original code by Carles Kishimoto <carles.kishimoto@gmail.com> + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <stdio.h> +#include <string.h> + +#include "interface.h" +#include "addrtoname.h" +#include "extract.h" +#include "nlpid.h" + +#define DTP_HEADER_LEN 1 +#define DTP_DOMAIN_TLV 0x0001 +#define DTP_STATUS_TLV 0x0002 +#define DTP_DTP_TYPE_TLV 0x0003 +#define DTP_NEIGHBOR_TLV 0x0004 + +static struct tok dtp_tlv_values[] = { + { DTP_DOMAIN_TLV, "Domain TLV"}, + { DTP_STATUS_TLV, "Status TLV"}, + { DTP_DTP_TYPE_TLV, "DTP type TLV"}, + { DTP_NEIGHBOR_TLV, "Neighbor TLV"}, + { 0, NULL} +}; + +void +dtp_print (const u_char *pptr, u_int length) +{ + int type, len; + const u_char *tptr; + + if (length < DTP_HEADER_LEN) + goto trunc; + + tptr = pptr; + + if (!TTEST2(*tptr, DTP_HEADER_LEN)) + goto trunc; + + printf("DTPv%u, length %u", + (*tptr), + length); + + /* + * In non-verbose mode, just print version. + */ + if (vflag < 1) { + return; + } + + tptr += DTP_HEADER_LEN; + + while (tptr < (pptr+length)) { + + if (!TTEST2(*tptr, 4)) + goto trunc; + + type = EXTRACT_16BITS(tptr); + len = EXTRACT_16BITS(tptr+2); + + /* infinite loop check */ + if (type == 0 || len == 0) { + return; + } + + printf("\n\t%s (0x%04x) TLV, length %u", + tok2str(dtp_tlv_values, "Unknown", type), + type, len); + + switch (type) { + case DTP_DOMAIN_TLV: + printf(", %s", tptr+4); + break; + + case DTP_STATUS_TLV: + case DTP_DTP_TYPE_TLV: + printf(", 0x%x", *(tptr+4)); + break; + + case DTP_NEIGHBOR_TLV: + printf(", %s", etheraddr_string(tptr+4)); + break; + + default: + break; + } + tptr += len; + } + + return; + + trunc: + printf("[|dtp]"); +} + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 4 + * End: + */ |