* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \summary: Routing Information Protocol (RIP) printer */
-#include <tcpdump-stdinc.h>
+/* specification: RFC 1058, RFC 2453, RFC 4822 */
-#include <stdio.h>
+#include <config.h>
-#include "interface.h"
+#include "netdissect-stdinc.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"
-static const char tstr[] = "[|rip]";
+/*
+ * 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 {
- uint8_t rip_cmd; /* request/response */
- uint8_t rip_vers; /* protocol version # */
- uint8_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}
};
#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) |
*
*/
-struct rip_netinfo {
- uint16_t rip_family;
- uint16_t rip_tag;
- uint32_t rip_dest;
- uint32_t rip_dest_mask;
- uint32_t rip_router;
- uint32_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 */
+};
+
+/*
+ * 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 void
-rip_entry_print_v1(netdissect_options *ndo,
- register const struct rip_netinfo *ni)
+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) {
- ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)));
- print_unknown_data(ndo, (const uint8_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(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
- return;
+ print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN);
+ return (RIP_ROUTELEN);
}
if (family == 0) {
- ND_PRINT((ndo, "\n\t AFI 0, %s, metric: %u",
- ipaddr_string(ndo, &ni->rip_dest),
- EXTRACT_32BITS(&ni->rip_metric)));
- return;
- } /* BSD_AFNUM_INET */
- ND_PRINT((ndo, "\n\t %s, metric: %u",
- ipaddr_string(ndo, &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(netdissect_options *ndo,
- 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 */
- uint16_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 const u_char *p = (const u_char *)&ni->rip_dest;
- u_int i = 0;
- ND_PRINT((ndo, "\n\t Simple Text Authentication data: "));
- for (; i < RIP_AUTHLEN; p++, i++)
- ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.'));
+ ND_PRINT("\n\t Simple Text Authentication data: ");
+ nd_printjnp(ndo, p, RIP_AUTHLEN);
} else if (auth_type == 3) {
- ND_PRINT((ndo, "\n\t Auth header:"));
- ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((const uint8_t *)ni + 4)));
- ND_PRINT((ndo, " Key-ID %u,", *((const uint8_t *)ni + 6)));
- ND_PRINT((ndo, " Auth Data Len %u,", *((const uint8_t *)ni + 7)));
- ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)));
- ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router)));
- ND_PRINT((ndo, " 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) {
- ND_PRINT((ndo, "\n\t Auth trailer:"));
- print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
- return remaining; /* AT spans till the packet end */
+ 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((ndo, "\n\t Unknown (%u) Authentication data:",
- EXTRACT_16BITS(&ni->rip_tag)));
- print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
+ 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) {
- ND_PRINT((ndo, "\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)));
- print_unknown_data(ndo, (const uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2);
- } else { /* BSD_AFNUM_INET or AFI 0 */
- ND_PRINT((ndo, "\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(EXTRACT_32BITS(&ni->rip_dest_mask)),
- EXTRACT_16BITS(&ni->rip_tag),
- EXTRACT_32BITS(&ni->rip_metric)));
- if (EXTRACT_32BITS(&ni->rip_router))
- ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router)));
+ } 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((ndo, "self"));
+ ND_PRINT("self");
}
- return sizeof (*ni);
+ return (RIP_ROUTELEN);
+invalid:
+ return 0;
}
void
rip_print(netdissect_options *ndo,
- const u_char *dat, u_int length)
+ 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 (ndo->ndo_snapend < dat) {
- ND_PRINT((ndo, " %s", tstr));
- 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 = ndo->ndo_snapend - dat;
- if (i > length)
- i = length;
- if (i < sizeof(*rp)) {
- ND_PRINT((ndo, " %s", tstr));
+
+ /* 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 = (const struct rip *)dat;
-
- ND_PRINT((ndo, "%sRIPv%u",
- (ndo->ndo_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(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
- break;
- default:
- /* dump version and lets see if we know the commands name*/
- ND_PRINT((ndo, ", %s, length: %u",
- tok2str(rip_cmd_values,
- "unknown command (%u)",
- rp->rip_cmd),
- length));
-
- if (ndo->ndo_vflag < 1)
- return;
-
- switch (rp->rip_cmd) {
- case RIPCMD_REQUEST:
- case RIPCMD_RESPONSE:
- j = length / sizeof(*ni);
- ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : ""));
- ni = (const struct rip_netinfo *)(rp + 1);
- for (; i >= sizeof(*ni); ++ni) {
- if (rp->rip_vers == 1)
- {
- rip_entry_print_v1(ndo, 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(ndo, ni, i);
- else
- break;
+ ND_ICHECKMSG_U("remaining entries length",
+ len, <, entry_size);
+ p += entry_size;
+ len -= entry_size;
}
- if (i)
- ND_PRINT((ndo, "%s", tstr));
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 (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;
- }
- }
-}
+ 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);
+}
projects / tcpdump / blobdiff