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gre: add support for MikroTik Ethernet-over-IP hack.
[tcpdump] / print-rip.c
diff --git a/print-rip.c b/print-rip.c
index f8f523c564ad6ed7942a11d2dc453876cd073775..57e7e481121e051af0ac09b38aa228d4a8d9b1da 100644 (file)
--- a/print-rip.c
+++ b/print-rip.c
@@ -19,221 +19,378 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.53 2002-11-09 17:19:30 itojun Exp $ (LBL)";
-#endif
+/* \summary: Routing Information Protocol (RIP) printer */
+
+/* specification: RFC 1058, RFC 2453, RFC 4822 */
 
 #ifdef HAVE_CONFIG_H
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
 #endif
 
-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
-#include <string.h>
+#include "netdissect-stdinc.h"
 
 
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
 #include "addrtoname.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 {
 struct rip {
-       u_int8_t rip_cmd;               /* request/response */
-       u_int8_t rip_vers;              /* protocol version # */
-       u_int16_t rip_zero2;            /* unused */
-} __attribute__((packed));
+       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_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 */
-
-#define RIP_AUTHLEN 16
-
-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 */
-} __attribute__((packed));
-
-static void
-rip_printblk(const u_char *cp, const u_char *ep)
-{
-       for (; cp < ep; cp += 2)
-               printf(" %04x", EXTRACT_16BITS(cp));
-       return;
-}
+/* 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_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_AUTHLEN  16
+#define RIP_ROUTELEN 20
+
+/*
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | 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 void
-rip_entry_print_v1(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 */
 
        /* 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;
+       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 (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 */
                /* 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",
+                        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 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;
+
+       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 = 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: ");
+                       nd_printjnp(ndo, p, RIP_AUTHLEN);
+               } else if (auth_type == 3) {
+                       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("\n\t  Auth trailer:");
+                       print_unknown_data(ndo, p, "\n\t  ", remaining);
+                       return (sizeof(*eh) + remaining); /* AT spans till the packet end */
                } else {
                } 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_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 (RIP_ROUTELEN);
+invalid:
+       return 0;
 }
 
 void
 }
 
 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;
-       register int trunc;
+       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;
                return;
-       }
-       i -= sizeof(*rp);
-
-       rp = (struct rip *)dat;
-       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 first few words of
-                * 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);
+       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;
+                               }
+                               ND_ICHECKMSG_U("remaining entries length",
+                                              len, <, entry_size);
+                               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;
                        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:
+                       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;
                        break;
+
                default:
                default:
-                       printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
-                              length);
+                       ND_PRINT(", unknown version");
                        break;
                }
                        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);
 }
 }
[mirror] the TCPdump network dissector