X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/a945058fa79c1bba7adf12268d9d2baa56e35316..refs/heads/master:/print-rip.c diff --git a/print-rip.c b/print-rip.c index 327f057a..a399c610 100644 --- a/print-rip.c +++ b/print-rip.c @@ -19,46 +19,60 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.59 2006-03-23 14:58:44 hannes Exp $ (LBL)"; -#endif +/* \summary: Routing Information Protocol (RIP) printer */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif +/* specification: RFC 1058, RFC 2453, RFC 4822 */ -#include +#include -#include -#include +#include "netdissect-stdinc.h" -#include "interface.h" +#define ND_LONGJMP_FROM_TCHECK +#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_int8_t rip_cmd; /* request/response */ - u_int8_t rip_vers; /* protocol version # */ - u_int8_t unused[2]; /* 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 */ #define RIPCMD_TRACEOFF 4 /* turn it off */ -#define RIPCMD_POLL 5 /* want info from everybody */ -#define RIPCMD_POLLENTRY 6 /* poll for entry */ +/* 5 is reserved */ +#define RIPCMD_TRIGREQ 6 +#define RIPCMD_TRIGRESP 7 +#define RIPCMD_TRIGACK 8 +#define RIPCMD_UPDREQ 9 +#define RIPCMD_UPDRESP 10 +#define RIPCMD_UPDACK 11 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" }, + { RIPCMD_TRIGREQ, "Triggered Request" }, + { RIPCMD_TRIGRESP, "Triggered Response" }, + { RIPCMD_TRIGACK, "Triggered Acknowledgement" }, + { RIPCMD_UPDREQ, "Update Request" }, + { RIPCMD_UPDRESP, "Update Response" }, + { RIPCMD_UPDACK, "Update Acknowledge" }, { 0, NULL} }; @@ -66,13 +80,46 @@ static const struct tok rip_cmd_values[] = { #define RIP_ROUTELEN 20 /* - * rfc 1723 - * + * 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 */ +}; + + +/* + * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Command (1) | Version (1) | unused | - * +---------------+---------------+-------------------------------+ * | Address Family Identifier (2) | Route Tag (2) | * +-------------------------------+-------------------------------+ * | IP Address (4) | @@ -86,187 +133,262 @@ static const struct tok rip_cmd_values[] = { * */ -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 */ +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 */ }; -static void -rip_entry_print_v1(register const struct rip_netinfo *ni) +/* + * 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 != BSD_AFNUM_INET && family != 0) { - printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)); - print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); - return; + ND_ICHECKMSG_U("remaining data length", remaining, <, RIP_ROUTELEN); + ND_TCHECK_SIZE(ni); + family = GET_BE_U_2(ni->rip_family); + if (family != BSD_AF_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 (EXTRACT_16BITS(&ni->rip_tag) || - EXTRACT_32BITS(&ni->rip_dest_mask) || - EXTRACT_32BITS(&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 */ - print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); - return; + print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN); + return (RIP_ROUTELEN); } if (family == 0) { - printf("\n\t AFI 0, %s, metric: %u", - ipaddr_string(&ni->rip_dest), - EXTRACT_32BITS(&ni->rip_metric)); - return; - } /* BSD_AFNUM_INET */ - printf("\n\t %s, metric: %u", - ipaddr_string(&ni->rip_dest), - EXTRACT_32BITS(&ni->rip_metric)); + ND_PRINT("\n\t AFI 0, %s, metric: %u", + GET_IPADDR_STRING(ni->rip_dest), + GET_BE_U_4(ni->rip_metric)); + return (RIP_ROUTELEN); + } /* BSD_AF_INET */ + ND_PRINT("\n\t %s, metric: %u", + GET_IPADDR_STRING(ni->rip_dest), + GET_BE_U_4(ni->rip_metric)); + return (RIP_ROUTELEN); +invalid: + return 0; } static unsigned -rip_entry_print_v2(register const struct rip_netinfo *ni, const unsigned remaining) +rip_entry_print_v2(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_v2 *ni; - family = EXTRACT_16BITS(&ni->rip_family); + ND_ICHECKMSG_ZU("remaining data length", remaining, <, sizeof(*eh)); + ND_TCHECK_SIZE(eh); + family = GET_BE_U_2(eh->rip_family); if (family == 0xFFFF) { /* variable-sized authentication structures */ - u_int16_t auth_type = EXTRACT_16BITS(&ni->rip_tag); + uint16_t auth_type = GET_BE_U_2(eh->rip_tag); + + p += sizeof(*eh); + remaining -= sizeof(*eh); if (auth_type == 2) { - register u_char *p = (u_char *)&ni->rip_dest; - u_int i = 0; - printf("\n\t Simple Text Authentication data: "); - for (; i < RIP_AUTHLEN; p++, i++) - putchar (isprint(*p) ? *p : '.'); + ND_PRINT("\n\t Simple Text Authentication data: "); + nd_printjnp(ndo, p, RIP_AUTHLEN); } else if (auth_type == 3) { - printf("\n\t Auth header:"); - printf(" Packet Len %u,", EXTRACT_16BITS(&ni->rip_dest)); - printf(" Key-ID %u,", *((u_int8_t *)ni + 6)); - printf(" Auth Data Len %u,", *((u_int8_t *)ni + 7)); - printf(" SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)); - printf(" MBZ %u,", EXTRACT_32BITS(&ni->rip_router)); - printf(" MBZ %u", EXTRACT_32BITS(&ni->rip_metric)); + const struct rip_auth_crypto_v2 *ch; + + ch = (const struct rip_auth_crypto_v2 *)p; + ND_ICHECKMSG_ZU("remaining data length", remaining, + <, sizeof(*ch)); + 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) { - printf("\n\t Auth trailer:"); - print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",remaining); - return remaining; /* AT spans till the packet end */ - } else { - printf("\n\t Unknown (%u) Authentication data:", - EXTRACT_16BITS(&ni->rip_tag)); - print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",remaining); + 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 { + 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 != BSD_AFNUM_INET && family != 0) { - printf("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)); - print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); - } else { /* BSD_AFNUM_INET or AFI 0 */ - printf("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", - tok2str(bsd_af_values, "%u", family), - 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"); + } else if (family != BSD_AF_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_AF_INET or AFI 0 */ + ni = (const struct rip_netinfo_v2 *)p; + ND_ICHECKMSG_ZU("remaining data length", remaining, <, + sizeof(*ni)); + ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", + tok2str(bsd_af_values, "%u", family), + GET_IPADDR_STRING(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", GET_IPADDR_STRING(ni->rip_router)); + else + ND_PRINT("self"); } - return sizeof (*ni); + return (RIP_ROUTELEN); +invalid: + return 0; } void -rip_print(const u_char *dat, u_int length) +rip_print(netdissect_options *ndo, + const u_char *p, u_int len) { - register const struct rip *rp; - register const struct rip_netinfo *ni; - register u_int i, j; + const struct rip *rp; + uint8_t vers, cmd; + unsigned entry_size; - if (snapend < dat) { - printf(" [|rip]"); - return; + ndo->ndo_protocol = "rip"; + ND_PRINT("%s", (ndo->ndo_vflag >= 1) ? "\n\t" : ""); + nd_print_protocol_caps(ndo); + ND_ICHECKMSG_ZU("packet length", len, <, sizeof(*rp)); + + rp = (const struct rip *)p; + + vers = GET_U_1(rp->rip_vers); + ND_PRINT("v%u", vers); + if (vers != 1 && vers != 2) { + ND_PRINT(" [version != 1 && version != 2]"); + goto invalid; } - i = snapend - dat; - if (i > length) - i = length; - if (i < sizeof(*rp)) { - printf(" [|rip]"); + + /* 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), + len); + + ND_TCHECK_SIZE(rp); + if (ndo->ndo_vflag < 1) 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_REQUEST: - case RIPCMD_RESPONSE: - j = length / sizeof(*ni); - printf(", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : ""); - ni = (struct rip_netinfo *)(rp + 1); - for (; i >= sizeof(*ni); ++ni) { - if (rp->rip_vers == 1) - { - rip_entry_print_v1(ni); - i -= sizeof(*ni); + p += sizeof(*rp); + len -= sizeof(*rp); + + switch (cmd) { + + case RIPCMD_REQUEST: + case RIPCMD_RESPONSE: + switch (vers) { + + case 1: + ND_PRINT(", routes: %u", len / RIP_ROUTELEN); + while (len != 0) { + entry_size = rip_entry_print_v1(ndo, p, len); + if (entry_size == 0) { + /* Error */ + goto invalid; } - else if (rp->rip_vers == 2) - i -= rip_entry_print_v2(ni, i); - else - break; + ND_ICHECKMSG_U("remaining entries length", + len, <, entry_size); + p += entry_size; + len -= entry_size; } - if (i) - printf("[|rip]"); break; - case RIPCMD_TRACEOFF: - case RIPCMD_POLL: - case RIPCMD_POLLENTRY: + case 2: + ND_PRINT(", routes: %u or less", len / RIP_ROUTELEN); + while (len != 0) { + entry_size = rip_entry_print_v2(ndo, p, len); + if (entry_size == 0) { + /* Error */ + goto invalid; + } + ND_ICHECKMSG_U("remaining entries length", + len, <, entry_size); + p += entry_size; + len -= entry_size; + } 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; - } - } -} + default: + ND_PRINT(", unknown version"); + break; + } + break; + case RIPCMD_TRACEON: + case RIPCMD_TRACEOFF: + case RIPCMD_TRIGREQ: + case RIPCMD_TRIGRESP: + case RIPCMD_TRIGACK: + case RIPCMD_UPDREQ: + case RIPCMD_UPDRESP: + case RIPCMD_UPDACK: + break; + default: + if (ndo->ndo_vflag <= 1) { + if (!print_unknown_data(ndo, p, "\n\t", len)) + return; + } + break; + } + /* do we want to see an additionally hexdump ? */ + if (ndo->ndo_vflag > 1 && ND_TTEST_LEN(p, len)) { + if (!print_unknown_data(ndo, p, "\n\t", len)) + return; + } + return; +invalid: + nd_print_invalid(ndo); + ND_TCHECK_LEN(p, len); +}