| /* |
| * Copyright (c) 2001 William C. Fenner. |
| * 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, 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. |
| * The name of William C. Fenner may not 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. |
| */ |
| |
| /* \summary: Multicast Source Discovery Protocol (MSDP) printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <netdissect-stdinc.h> |
| |
| #include "netdissect.h" |
| #include "addrtoname.h" |
| #include "extract.h" |
| |
| #define MSDP_TYPE_MAX 7 |
| |
| void |
| msdp_print(netdissect_options *ndo, const u_char *sp, u_int length) |
| { |
| unsigned int type, len; |
| |
| ND_TCHECK2(*sp, 3); |
| /* See if we think we're at the beginning of a compound packet */ |
| type = *sp; |
| len = EXTRACT_16BITS(sp + 1); |
| if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) |
| goto trunc; /* not really truncated, but still not decodable */ |
| ND_PRINT((ndo, " msdp:")); |
| while (length > 0) { |
| ND_TCHECK2(*sp, 3); |
| type = *sp; |
| len = EXTRACT_16BITS(sp + 1); |
| if (len > 1400 || ndo->ndo_vflag) |
| ND_PRINT((ndo, " [len %u]", len)); |
| if (len < 3) |
| goto trunc; |
| sp += 3; |
| length -= 3; |
| switch (type) { |
| case 1: /* IPv4 Source-Active */ |
| case 3: /* IPv4 Source-Active Response */ |
| if (type == 1) |
| ND_PRINT((ndo, " SA")); |
| else |
| ND_PRINT((ndo, " SA-Response")); |
| ND_TCHECK(*sp); |
| ND_PRINT((ndo, " %u entries", *sp)); |
| if ((u_int)((*sp * 12) + 8) < len) { |
| ND_PRINT((ndo, " [w/data]")); |
| if (ndo->ndo_vflag > 1) { |
| ND_PRINT((ndo, " ")); |
| ip_print(ndo, sp + *sp * 12 + 8 - 3, |
| len - (*sp * 12 + 8)); |
| } |
| } |
| break; |
| case 2: |
| ND_PRINT((ndo, " SA-Request")); |
| ND_TCHECK2(*sp, 5); |
| ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1))); |
| break; |
| case 4: |
| ND_PRINT((ndo, " Keepalive")); |
| if (len != 3) |
| ND_PRINT((ndo, "[len=%d] ", len)); |
| break; |
| case 5: |
| ND_PRINT((ndo, " Notification")); |
| break; |
| default: |
| ND_PRINT((ndo, " [type=%d len=%d]", type, len)); |
| break; |
| } |
| sp += (len - 3); |
| length -= (len - 3); |
| } |
| return; |
| trunc: |
| ND_PRINT((ndo, " [|msdp]")); |
| } |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |