X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/c422d3ab0f6de2d38512a4566637bc47df291e74..cda9bf8c5f842fc7110fbbf2234bcc898f78c0bd:/print-rip.c diff --git a/print-rip.c b/print-rip.c index 78403a4b..c8d17c3e 100644 --- a/print-rip.c +++ b/print-rip.c @@ -19,29 +19,40 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.52 2002-09-05 21:25:46 guy Exp $ (LBL)"; -#endif +/* \summary: Routing Information Protocol (RIP) printer */ + +/* specification: RFC 1058, RFC 2453, RFC 4822 */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include +#include "netdissect-stdinc.h" #include -#include -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" -#include "extract.h" /* must come after interface.h */ +#include "extract.h" + +#include "af.h" + +/* + * RFC 1058 and RFC 2453 header of packet. + * + * 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 | + * +---------------+---------------+-------------------------------+ + */ struct rip { - u_char rip_cmd; /* request/response */ - u_char rip_vers; /* protocol version # */ - u_short rip_zero2; /* unused */ + nd_uint8_t rip_cmd; /* request/response */ + nd_uint8_t rip_vers; /* protocol version # */ + nd_byte unused[2]; /* unused */ }; + #define RIPCMD_REQUEST 1 /* want info */ #define RIPCMD_RESPONSE 2 /* responding to request */ #define RIPCMD_TRACEON 3 /* turn tracing on */ @@ -49,130 +60,267 @@ struct rip { #define RIPCMD_POLL 5 /* want info from everybody */ #define RIPCMD_POLLENTRY 6 /* poll for entry */ -#define RIP_AUTHLEN 16 +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 -struct rip_netinfo { - u_short rip_family; - u_short 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 */ +/* + * First 4 bytes of all RIPv1/RIPv2 entries. + */ +struct rip_entry_header { + nd_uint16_t rip_family; + nd_uint16_t rip_tag; +}; + +/* + * RFC 1058 entry. + * + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Address Family Identifier (2) | must be zero (2) | + * +-------------------------------+-------------------------------+ + * | IP Address (4) | + * +---------------------------------------------------------------+ + * | must be zero (4) | + * +---------------------------------------------------------------+ + * | must be zero (4) | + * +---------------------------------------------------------------+ + * | Metric (4) | + * +---------------------------------------------------------------+ + */ +struct rip_netinfo_v1 { + nd_uint16_t rip_family; + nd_byte rip_mbz1[2]; + nd_ipv4 rip_dest; + nd_byte rip_mbz2[4]; + nd_byte rip_mbz3[4]; + nd_uint32_t rip_metric; /* cost of route */ }; -static void -rip_printblk(const u_char *cp, const u_char *ep) -{ - for (; cp < ep; cp += 2) - printf(" %04x", EXTRACT_16BITS(cp)); - return; -} -static void -rip_entry_print_v1(register const struct rip_netinfo *ni) +/* + * RFC 2453 route entry + * + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Address Family Identifier (2) | Route Tag (2) | + * +-------------------------------+-------------------------------+ + * | IP Address (4) | + * +---------------------------------------------------------------+ + * | Subnet Mask (4) | + * +---------------------------------------------------------------+ + * | Next Hop (4) | + * +---------------------------------------------------------------+ + * | Metric (4) | + * +---------------------------------------------------------------+ + * + */ + +struct rip_netinfo_v2 { + nd_uint16_t rip_family; + nd_uint16_t rip_tag; + nd_ipv4 rip_dest; + nd_uint32_t rip_dest_mask; + nd_ipv4 rip_router; + nd_uint32_t rip_metric; /* cost of route */ +}; + +/* + * RFC 2453 authentication entry + * + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | 0xFFFF | Authentication Type (2) | + * +-------------------------------+-------------------------------+ + * - Authentication (16) - + * +---------------------------------------------------------------+ + */ + +struct rip_auth_v2 { + nd_uint16_t rip_family; + nd_uint16_t rip_tag; + nd_byte rip_auth[16]; +}; + +/* + * RFC 4822 Cryptographic Authentication entry. + * + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | RIPv2 Packet Length | Key ID | Auth Data Len | + * +---------------+---------------+---------------+---------------+ + * | Sequence Number (non-decreasing) | + * +---------------+---------------+---------------+---------------+ + * | reserved must be zero | + * +---------------+---------------+---------------+---------------+ + * | reserved must be zero | + * +---------------+---------------+---------------+---------------+ + */ +struct rip_auth_crypto_v2 { + nd_uint16_t rip_packet_len; + nd_uint8_t rip_key_id; + nd_uint8_t rip_auth_data_len; + nd_uint32_t rip_seq_num; + nd_byte rip_mbz1[4]; + nd_byte rip_mbz2[4]; +}; + +static unsigned +rip_entry_print_v1(netdissect_options *ndo, const u_char *p, + unsigned remaining) { - register u_short family; + const struct rip_entry_header *eh = (const struct rip_entry_header *)p; + u_short family; + const struct rip_netinfo_v1 *ni = (const struct rip_netinfo_v1 *)p; /* RFC 1058 */ - family = EXTRACT_16BITS(&ni->rip_family); - if (family != AF_INET) { - printf(" [family %d:", family); - rip_printblk((u_char *)&ni->rip_tag, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - printf("]"); - return; + if (remaining < RIP_ROUTELEN) + return (0); + ND_TCHECK_SIZE(ni); + family = GET_BE_U_2(ni->rip_family); + if (family != BSD_AFNUM_INET && family != 0) { + ND_PRINT("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)); + print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh)); + return (RIP_ROUTELEN); } - if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) { + if (GET_BE_U_2(ni->rip_mbz1) || + GET_BE_U_4(ni->rip_mbz2) || + GET_BE_U_4(ni->rip_mbz3)) { /* MBZ fields not zero */ - printf(" ["); - rip_printblk((u_char *)&ni->rip_family, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - printf("]"); - return; + print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN); + return (RIP_ROUTELEN); } - printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest), - EXTRACT_32BITS(&ni->rip_metric)); + if (family == 0) { + ND_PRINT("\n\t AFI 0, %s, metric: %u", + ipaddr_string(ndo, ni->rip_dest), + GET_BE_U_4(ni->rip_metric)); + return (RIP_ROUTELEN); + } /* BSD_AFNUM_INET */ + ND_PRINT("\n\t %s, metric: %u", + ipaddr_string(ndo, ni->rip_dest), + GET_BE_U_4(ni->rip_metric)); + return (RIP_ROUTELEN); +trunc: + return 0; } -static void -rip_entry_print_v2(register const struct rip_netinfo *ni) +static unsigned +rip_entry_print_v2(netdissect_options *ndo, const u_char *p, + unsigned remaining) { - register u_char *p; - register u_short family; - u_char buf[RIP_AUTHLEN]; - - /* RFC 1723 */ - family = EXTRACT_16BITS(&ni->rip_family); - if (family == 0xFFFF) { - if (EXTRACT_16BITS(&ni->rip_tag) == 2) { - memcpy(buf, &ni->rip_dest, sizeof(buf)); - buf[sizeof(buf)-1] = '\0'; - for (p = buf; *p; p++) { - if (!isprint(*p)) - break; - } - if (!*p) { - printf(" [password %s]", buf); - } else { - printf(" [password: "); - rip_printblk((u_char *)&ni->rip_dest, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - printf("]"); - } + const struct rip_entry_header *eh = (const struct rip_entry_header *)p; + u_short family; + const struct rip_netinfo_v2 *ni; + + if (remaining < sizeof(*eh)) + return (0); + ND_TCHECK_SIZE(eh); + family = GET_BE_U_2(eh->rip_family); + if (family == 0xFFFF) { /* variable-sized authentication structures */ + uint16_t auth_type = GET_BE_U_2(eh->rip_tag); + + p += sizeof(*eh); + remaining -= sizeof(*eh); + if (auth_type == 2) { + ND_PRINT("\n\t Simple Text Authentication data: "); + if (nd_printzp(ndo, p, RIP_AUTHLEN, p + remaining)) + return (0); + } else if (auth_type == 3) { + const struct rip_auth_crypto_v2 *ch; + + ch = (const struct rip_auth_crypto_v2 *)p; + ND_TCHECK_SIZE(ch); + if (remaining < sizeof(*ch)) + return (0); + ND_PRINT("\n\t Auth header:"); + ND_PRINT(" Packet Len %u,", + GET_BE_U_2(ch->rip_packet_len)); + ND_PRINT(" Key-ID %u,", GET_U_1(ch->rip_key_id)); + ND_PRINT(" Auth Data Len %u,", + GET_U_1(ch->rip_auth_data_len)); + ND_PRINT(" SeqNo %u,", GET_BE_U_4(ch->rip_seq_num)); + ND_PRINT(" MBZ %u,", GET_BE_U_4(ch->rip_mbz1)); + ND_PRINT(" MBZ %u", GET_BE_U_4(ch->rip_mbz2)); + } else if (auth_type == 1) { + ND_PRINT("\n\t Auth trailer:"); + print_unknown_data(ndo, p, "\n\t ", remaining); + return (sizeof(*eh) + remaining); /* AT spans till the packet end */ } else { - printf(" [auth %d:", - EXTRACT_16BITS(&ni->rip_tag)); - rip_printblk((u_char *)&ni->rip_dest, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - printf("]"); + ND_PRINT("\n\t Unknown (%u) Authentication data:", + auth_type); + print_unknown_data(ndo, p, "\n\t ", remaining); + return (sizeof(*eh) + remaining); /* we don't know how long this is, so we go to the packet end */ } - } else if (family != AF_INET) { - printf(" [family %d:", family); - rip_printblk((u_char *)&ni->rip_tag, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - printf("]"); - return; - } else { /* AF_INET */ - printf(" {%s", ipaddr_string(&ni->rip_dest)); - if (ni->rip_dest_mask) - printf("/%s", ipaddr_string(&ni->rip_dest_mask)); - if (ni->rip_router) - printf("->%s", ipaddr_string(&ni->rip_router)); - if (ni->rip_tag) - printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag)); - printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric)); + } else if (family != BSD_AFNUM_INET && family != 0) { + ND_PRINT("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)); + print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh)); + } else { /* BSD_AFNUM_INET or AFI 0 */ + ni = (const struct rip_netinfo_v2 *)p; + ND_TCHECK_SIZE(ni); + if (remaining < sizeof(*ni)) + return (0); + ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", + tok2str(bsd_af_values, "%u", family), + ipaddr_string(ndo, ni->rip_dest), + mask2plen(GET_BE_U_4(ni->rip_dest_mask)), + GET_BE_U_2(ni->rip_tag), + GET_BE_U_4(ni->rip_metric)); + if (GET_BE_U_4(ni->rip_router)) + ND_PRINT("%s", ipaddr_string(ndo, ni->rip_router)); + else + ND_PRINT("self"); } + return (RIP_ROUTELEN); +trunc: + return 0; } void -rip_print(const u_char *dat, u_int length) +rip_print(netdissect_options *ndo, + 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; + const struct rip *rp; + uint8_t vers, cmd; + const u_char *p; + u_int len, routecount; + unsigned entry_size; - if (snapend < dat) { - printf(" [|rip]"); + ndo->ndo_protocol = "rip"; + if (ndo->ndo_snapend < dat) { + nd_print_trunc(ndo); return; } - i = snapend - dat; - if (i > length) - i = length; - if (i < sizeof(*rp)) { - printf(" [|rip]"); + len = ndo->ndo_snapend - dat; + if (len > length) + len = length; + if (len < sizeof(*rp)) { + nd_print_trunc(ndo); return; } - i -= sizeof(*rp); + len -= sizeof(*rp); + + rp = (const struct rip *)dat; - rp = (struct rip *)dat; - switch (rp->rip_vers) { - case 0: + ND_TCHECK_SIZE(rp); + vers = GET_U_1(rp->rip_vers); + ND_PRINT("%sRIPv%u", + (ndo->ndo_vflag >= 1) ? "\n\t" : "", + vers); + + if (vers == 0) { /* * RFC 1058. * @@ -182,58 +330,96 @@ rip_print(const u_char *dat, u_int length) * These are from a previous version of the protocol, whose * packet format was machine-specific. * - * so perhaps we should just dump the first few words of - * the packet, in hex. + * so perhaps we should just dump the packet, in hex. */ - printf(" RIPv0: "); - ni = (struct rip_netinfo *)(rp + 1); - rip_printblk((u_char *)&ni->rip_family, - (u_char *)&ni->rip_metric + - sizeof(ni->rip_metric)); - break; - default: - switch (rp->rip_cmd) { - case RIPCMD_REQUEST: - printf(" RIPv%d-req %d", rp->rip_vers, length); - break; - case RIPCMD_RESPONSE: - j = length / sizeof(*ni); - if (j * sizeof(*ni) + 4 != length) - printf(" RIPv%d-resp [items %d] [%d]:", - rp->rip_vers, j, length); - else - printf(" RIPv%d-resp [items %d]:", - rp->rip_vers, 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 - rip_entry_print_v2(ni); - i -= sizeof(*ni); + print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length); + return; + } + + /* dump version and lets see if we know the commands name*/ + cmd = GET_U_1(rp->rip_cmd); + ND_PRINT(", %s, length: %u", + tok2str(rip_cmd_values, "unknown command (%u)", cmd), + length); + + if (ndo->ndo_vflag < 1) + return; + + switch (cmd) { + + case RIPCMD_REQUEST: + case RIPCMD_RESPONSE: + switch (vers) { + + case 1: + routecount = length / RIP_ROUTELEN; + ND_PRINT(", routes: %u", routecount); + p = (const u_char *)(rp + 1); + while (len != 0) { + entry_size = rip_entry_print_v1(ndo, p, len); + if (entry_size == 0) { + /* Error */ + nd_print_trunc(ndo); + break; + } + if (len < entry_size) { + ND_PRINT(" [remaining entries length %u < %u]", + len, entry_size); + nd_print_invalid(ndo); + break; + } + p += entry_size; + len -= entry_size; } - if (trunc) - printf("[|rip]"); - break; - case RIPCMD_TRACEON: - printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length); - (void)fn_print((const u_char *)(rp + 1), snapend); - fputs("\"", stdout); - break; - case RIPCMD_TRACEOFF: - printf(" RIPv%d-traceoff %d", rp->rip_vers, length); - break; - case RIPCMD_POLL: - printf(" RIPv%d-poll %d", rp->rip_vers, length); break; - case RIPCMD_POLLENTRY: - printf(" RIPv%d-pollentry %d", rp->rip_vers, length); + + case 2: + routecount = length / RIP_ROUTELEN; + ND_PRINT(", routes: %u or less", routecount); + p = (const u_char *)(rp + 1); + while (len != 0) { + entry_size = rip_entry_print_v2(ndo, p, len); + if (entry_size == 0) { + /* Error */ + nd_print_trunc(ndo); + break; + } + if (len < entry_size) { + ND_PRINT(" [remaining entries length %u < %u]", + len, entry_size); + nd_print_invalid(ndo); + break; + } + p += entry_size; + len -= entry_size; + } break; + default: - printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd, - length); + ND_PRINT(", unknown version"); break; } + break; + + case RIPCMD_TRACEOFF: + case RIPCMD_POLL: + case RIPCMD_POLLENTRY: + break; + + case RIPCMD_TRACEON: + /* fall through */ + default: + if (ndo->ndo_vflag <= 1) { + if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length)) + return; + } + break; } + /* do we want to see an additionally hexdump ? */ + if (ndo->ndo_vflag> 1) { + if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length)) + return; + } +trunc: + return; }