/* $NetBSD: print-rip.c,v 1.4 2007/07/24 11:53:47 drochner Exp $ */ /* * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996 * The Regents of the University of California. 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, (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, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may 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. */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-rip.c,v 1.57 2003/11/16 09:36:34 guy Exp (LBL)"; #else __RCSID("$NetBSD: print-rip.c,v 1.4 2007/07/24 11:53:47 drochner Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "addrtoname.h" #include "extract.h" /* must come after interface.h */ struct rip { u_int8_t rip_cmd; /* request/response */ u_int8_t rip_vers; /* protocol version # */ u_int8_t unused[2]; /* unused */ }; #define RIPCMD_REQUEST 1 /* want info */ #define RIPCMD_RESPONSE 2 /* responding to request */ #define RIPCMD_TRACEON 3 /* turn tracing on */ #define RIPCMD_TRACEOFF 4 /* turn it off */ #define RIPCMD_POLL 5 /* want info from everybody */ #define RIPCMD_POLLENTRY 6 /* poll for entry */ static const struct tok rip_cmd_values[] = { { RIPCMD_REQUEST, "Request" }, { RIPCMD_RESPONSE, "Response" }, { RIPCMD_TRACEON, "Trace on" }, { RIPCMD_TRACEOFF, "Trace off" }, { RIPCMD_POLL, "Poll" }, { RIPCMD_POLLENTRY, "Poll Entry" }, { 0, NULL} }; #define RIP_AUTHLEN 16 #define RIP_ROUTELEN 20 /* * rfc 1723 * * 0 1 2 3 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Command (1) | Version (1) | unused | * +---------------+---------------+-------------------------------+ * | Address Family Identifier (2) | Route Tag (2) | * +-------------------------------+-------------------------------+ * | IP Address (4) | * +---------------------------------------------------------------+ * | Subnet Mask (4) | * +---------------------------------------------------------------+ * | Next Hop (4) | * +---------------------------------------------------------------+ * | Metric (4) | * +---------------------------------------------------------------+ * */ struct rip_netinfo { u_int16_t rip_family; u_int16_t rip_tag; u_int32_t rip_dest; u_int32_t rip_dest_mask; u_int32_t rip_router; u_int32_t rip_metric; /* cost of route */ }; static void rip_entry_print_v1(register const struct rip_netinfo *ni) { register u_short family; /* RFC 1058 */ family = EXTRACT_16BITS(&ni->rip_family); if (family != AF_INET) { printf("\n\t AFI: %u:", family); print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); return; } if (EXTRACT_16BITS(&ni->rip_tag) || EXTRACT_32BITS(&ni->rip_dest_mask) || EXTRACT_32BITS(&ni->rip_router)) { /* MBZ fields not zero */ print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); return; } /* AF_INET */ printf("\n\t %s, metric: %u", ipaddr_string(&ni->rip_dest), EXTRACT_32BITS(&ni->rip_metric)); } static void rip_entry_print_v2(register const struct rip_netinfo *ni) { register u_char *p; register u_short family; u_char buf[RIP_AUTHLEN]; family = EXTRACT_16BITS(&ni->rip_family); if (family == 0xFFFF) { /* 16 bytes authentication ? */ if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */ memcpy(buf, &ni->rip_dest, sizeof(buf)); buf[sizeof(buf)-1] = '\0'; for (p = buf; *p; p++) { if (!isprint(*p)) break; } printf("\n\t Simple Text Authentication data: %s", buf); } else { printf("\n\t Unknown (%u) Authentication data:", EXTRACT_16BITS(&ni->rip_tag)); print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN); } } else if (family != AF_INET) { printf("\n\t AFI: %u", family); print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); return; } else { /* AF_INET */ printf("\n\t AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", ipaddr_string(&ni->rip_dest), mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), EXTRACT_16BITS(&ni->rip_tag), EXTRACT_32BITS(&ni->rip_metric)); if (EXTRACT_32BITS(&ni->rip_router)) printf("%s", ipaddr_string(&ni->rip_router)); else printf("self"); } } void rip_print(const u_char *dat, u_int length) { register const struct rip *rp; register const struct rip_netinfo *ni; register u_int i, j; register int trunc; if (snapend < dat) { printf(" [|rip]"); return; } i = snapend - dat; if (i > length) i = length; if (i < sizeof(*rp)) { printf(" [|rip]"); return; } i -= sizeof(*rp); rp = (struct rip *)dat; printf("%sRIPv%u", (vflag >= 1) ? "\n\t" : "", rp->rip_vers); switch (rp->rip_vers) { case 0: /* * RFC 1058. * * XXX - RFC 1058 says * * 0 Datagrams whose version number is zero are to be ignored. * These are from a previous version of the protocol, whose * packet format was machine-specific. * * so perhaps we should just dump the packet, in hex. */ print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length); break; default: /* dump version and lets see if we know the commands name*/ printf(", %s, length: %u", tok2str(rip_cmd_values, "unknown command (%u)", rp->rip_cmd), length); if (vflag < 1) return; switch (rp->rip_cmd) { case RIPCMD_RESPONSE: j = length / sizeof(*ni); printf(", routes: %u",j); trunc = (i / sizeof(*ni)) != j; ni = (struct rip_netinfo *)(rp + 1); for (; i >= sizeof(*ni); ++ni) { if (rp->rip_vers == 1) rip_entry_print_v1(ni); else if (rp->rip_vers == 2) rip_entry_print_v2(ni); else break; i -= sizeof(*ni); } if (trunc) printf("[|rip]"); break; case RIPCMD_REQUEST: case RIPCMD_TRACEOFF: case RIPCMD_POLL: case RIPCMD_POLLENTRY: break; case RIPCMD_TRACEON: /* fall through */ default: if (vflag <= 1) { if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) return; } break; } /* do we want to see an additionally hexdump ? */ if (vflag> 1) { if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) return; } } }