X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ecfc7918a049cbc52ae87138c9a01cfb9f3dfa3f..1fb50928ce27360c1c987312774f686b23c69b51:/print-vtp.c diff --git a/print-vtp.c b/print-vtp.c index 7631c6f6..285beb96 100644 --- a/print-vtp.c +++ b/print-vtp.c @@ -12,29 +12,25 @@ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * - * VLAN TRUNKING PROTOCOL (VTP) - * * Reference documentation: - * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml - * http://www.cisco.com/warp/public/473/21.html + * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml + * http://www.cisco.com/warp/public/473/21.html * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm * * Original code ode by Carles Kishimoto */ +/* \summary: Cisco VLAN Trunking Protocol (VTP) printer */ + #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include +#include -#include -#include - -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" -#include "extract.h" -#include "nlpid.h" +#include "extract.h" #define VTP_HEADER_LEN 36 #define VTP_DOMAIN_NAME_LEN 32 @@ -48,16 +44,16 @@ #define VTP_JOIN_MESSAGE 0x04 struct vtp_vlan_ { - u_int8_t len; - u_int8_t status; - u_int8_t type; - u_int8_t name_len; - u_int16_t vlanid; - u_int16_t mtu; - u_int32_t index; + uint8_t len; + uint8_t status; + uint8_t type; + uint8_t name_len; + uint16_t vlanid; + uint16_t mtu; + uint32_t index; }; -static struct tok vtp_message_type_values[] = { +static const struct tok vtp_message_type_values[] = { { VTP_SUMMARY_ADV, "Summary advertisement"}, { VTP_SUBSET_ADV, "Subset advertisement"}, { VTP_ADV_REQUEST, "Advertisement request"}, @@ -65,7 +61,7 @@ static struct tok vtp_message_type_values[] = { { 0, NULL } }; -static struct tok vtp_header_values[] = { +static const struct tok vtp_header_values[] = { { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */ { 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */ { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */ @@ -73,7 +69,7 @@ static struct tok vtp_header_values[] = { { 0, NULL } }; -static struct tok vtp_vlan_type_values[] = { +static const struct tok vtp_vlan_type_values[] = { { 0x01, "Ethernet"}, { 0x02, "FDDI"}, { 0x03, "TrCRF"}, @@ -82,7 +78,7 @@ static struct tok vtp_vlan_type_values[] = { { 0, NULL } }; -static struct tok vtp_vlan_status[] = { +static const struct tok vtp_vlan_status[] = { { 0x00, "Operational"}, { 0x01, "Suspended"}, { 0, NULL } @@ -99,7 +95,7 @@ static struct tok vtp_vlan_status[] = { #define VTP_VLAN_STE_HOP_COUNT 0x09 #define VTP_VLAN_BACKUP_CRF_MODE 0x0A -static struct tok vtp_vlan_tlv_values[] = { +static const struct tok vtp_vlan_tlv_values[] = { { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"}, { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"}, { VTP_VLAN_STP_TYPE, "STP type TLV"}, @@ -113,7 +109,7 @@ static struct tok vtp_vlan_tlv_values[] = { { 0, NULL } }; -static struct tok vtp_stp_type_values[] = { +static const struct tok vtp_stp_type_values[] = { { 1, "SRT"}, { 2, "SRB"}, { 3, "Auto"}, @@ -121,37 +117,43 @@ static struct tok vtp_stp_type_values[] = { }; void -vtp_print (const u_char *pptr, u_int length) +vtp_print (netdissect_options *ndo, + const u_char *pptr, u_int length) { - int type, len, tlv_len, tlv_value; + int type, len, tlv_len, tlv_value, mgmtd_len; const u_char *tptr; const struct vtp_vlan_ *vtp_vlan; if (length < VTP_HEADER_LEN) goto trunc; - tptr = pptr; + tptr = pptr; - if (!TTEST2(*tptr, VTP_HEADER_LEN)) - goto trunc; + ND_TCHECK2(*tptr, VTP_HEADER_LEN); type = *(tptr+1); - printf("VTPv%u, Message %s (0x%02x), length %u", - *tptr, + ND_PRINT((ndo, "VTPv%u, Message %s (0x%02x), length %u", + *tptr, tok2str(vtp_message_type_values,"Unknown message type", type), - *(tptr+1), - length); + type, + length)); /* In non-verbose mode, just print version and message type */ - if (vflag < 1) { + if (ndo->ndo_vflag < 1) { return; } /* verbose mode print all fields */ - printf("\n\tDomain name: %s, %s: %u", - (tptr+4), - tok2str(vtp_header_values,"Unknown",*(tptr+1)), - *(tptr+2)); + ND_PRINT((ndo, "\n\tDomain name: ")); + mgmtd_len = *(tptr + 3); + if (mgmtd_len < 1 || mgmtd_len > 32) { + ND_PRINT((ndo, " [invalid MgmtD Len %d]", mgmtd_len)); + return; + } + fn_printzp(ndo, tptr + 4, mgmtd_len, NULL); + ND_PRINT((ndo, ", %s: %u", + tok2str(vtp_header_values, "Unknown", type), + *(tptr+2))); tptr += VTP_HEADER_LEN; @@ -164,9 +166,9 @@ vtp_print (const u_char *pptr, u_int length) * * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Version | Code | Followers | MmgtD Len | + * | Version | Code | Followers | MgmtD Len | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Management Domain Name | + * | Management Domain Name (zero-padded to 32 bytes) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Configuration revision number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -176,23 +178,26 @@ vtp_print (const u_char *pptr, u_int length) * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | MD5 digest (16 bytes) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * + * */ - printf("\n\t Config Rev %x, Updater %s", + ND_TCHECK2(*tptr, 8); + ND_PRINT((ndo, "\n\t Config Rev %x, Updater %s", EXTRACT_32BITS(tptr), - ipaddr_string(tptr+4)); - tptr += 8; - printf(", Timestamp 0x%08x 0x%08x 0x%08x", + ipaddr_string(ndo, tptr+4))); + tptr += 8; + ND_TCHECK2(*tptr, VTP_UPDATE_TIMESTAMP_LEN); + ND_PRINT((ndo, ", Timestamp 0x%08x 0x%08x 0x%08x", EXTRACT_32BITS(tptr), EXTRACT_32BITS(tptr + 4), - EXTRACT_32BITS(tptr + 8)); + EXTRACT_32BITS(tptr + 8))); tptr += VTP_UPDATE_TIMESTAMP_LEN; - printf(", MD5 digest: %08x%08x%08x%08x", + ND_TCHECK2(*tptr, VTP_MD5_DIGEST_LEN); + ND_PRINT((ndo, ", MD5 digest: %08x%08x%08x%08x", EXTRACT_32BITS(tptr), EXTRACT_32BITS(tptr + 4), EXTRACT_32BITS(tptr + 8), - EXTRACT_32BITS(tptr + 12)); + EXTRACT_32BITS(tptr + 12))); tptr += VTP_MD5_DIGEST_LEN; break; @@ -203,9 +208,9 @@ vtp_print (const u_char *pptr, u_int length) * * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Version | Code | Seq number | MmgtD Len | + * | Version | Code | Seq number | MgmtD Len | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Management Domain Name | + * | Management Domain Name (zero-padded to 32 bytes) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Configuration revision number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -215,12 +220,12 @@ vtp_print (const u_char *pptr, u_int length) * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | VLAN info field N | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * + * */ - printf(", Config Rev %x", EXTRACT_32BITS(tptr)); + ND_PRINT((ndo, ", Config Rev %x", EXTRACT_32BITS(tptr))); - /* + /* * VLAN INFORMATION * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -242,17 +247,17 @@ vtp_print (const u_char *pptr, u_int length) if (len == 0) break; - if (!TTEST2(*tptr, len)) - goto trunc; + ND_TCHECK2(*tptr, len); - vtp_vlan = (struct vtp_vlan_*)tptr; - printf("\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s", + vtp_vlan = (const struct vtp_vlan_*)tptr; + ND_TCHECK(*vtp_vlan); + ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name ", tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status), tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type), EXTRACT_16BITS(&vtp_vlan->vlanid), EXTRACT_16BITS(&vtp_vlan->mtu), - EXTRACT_32BITS(&vtp_vlan->index), - (tptr + VTP_VLAN_INFO_OFFSET)); + EXTRACT_32BITS(&vtp_vlan->index))); + fn_printzp(ndo, tptr + VTP_VLAN_INFO_OFFSET, vtp_vlan->name_len, NULL); /* * Vlan names are aligned to 32-bit boundaries. @@ -264,16 +269,16 @@ vtp_print (const u_char *pptr, u_int length) while (len > 0) { - /* + /* * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1 - * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm + * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm */ type = *tptr; tlv_len = *(tptr+1); - printf("\n\t\t%s (0x%04x) TLV", + ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV", tok2str(vtp_vlan_tlv_values, "Unknown", type), - type); + type)); /* * infinite loop check @@ -282,38 +287,37 @@ vtp_print (const u_char *pptr, u_int length) return; } - if (!TTEST2(*tptr, tlv_len*2 +2)) - goto trunc; + ND_TCHECK2(*tptr, tlv_len * 2 +2); tlv_value = EXTRACT_16BITS(tptr+2); switch (type) { case VTP_VLAN_STE_HOP_COUNT: - printf(", %u", tlv_value); + ND_PRINT((ndo, ", %u", tlv_value)); break; case VTP_VLAN_PRUNING: - printf(", %s (%u)", + ND_PRINT((ndo, ", %s (%u)", tlv_value == 1 ? "Enabled" : "Disabled", - tlv_value); + tlv_value)); break; case VTP_VLAN_STP_TYPE: - printf(", %s (%u)", + ND_PRINT((ndo, ", %s (%u)", tok2str(vtp_stp_type_values, "Unknown", tlv_value), - tlv_value); + tlv_value)); break; case VTP_VLAN_BRIDGE_TYPE: - printf(", %s (%u)", + ND_PRINT((ndo, ", %s (%u)", tlv_value == 1 ? "SRB" : "SRT", - tlv_value); + tlv_value)); break; case VTP_VLAN_BACKUP_CRF_MODE: - printf(", %s (%u)", + ND_PRINT((ndo, ", %s (%u)", tlv_value == 1 ? "Backup" : "Not backup", - tlv_value); + tlv_value)); break; /* @@ -327,7 +331,7 @@ vtp_print (const u_char *pptr, u_int length) case VTP_VLAN_TRANS_BRIDGED_VLAN: case VTP_VLAN_ARP_HOP_COUNT: default: - print_unknown_data(tptr, "\n\t\t ", 2 + tlv_len*2); + print_unknown_data(ndo, tptr, "\n\t\t ", 2 + tlv_len*2); break; } len -= 2 + tlv_len*2; @@ -343,16 +347,17 @@ vtp_print (const u_char *pptr, u_int length) * * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Version | Code | Reserved | MmgtD Len | + * | Version | Code | Reserved | MgmtD Len | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Management Domain Name | + * | Management Domain Name (zero-padded to 32 bytes) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Start value | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * */ - printf("\n\tStart value: %u", EXTRACT_32BITS(tptr)); + ND_TCHECK2(*tptr, 4); + ND_PRINT((ndo, "\n\tStart value: %u", EXTRACT_32BITS(tptr))); break; case VTP_JOIN_MESSAGE: @@ -367,7 +372,7 @@ vtp_print (const u_char *pptr, u_int length) return; trunc: - printf("[|vtp]"); + ND_PRINT((ndo, "[|vtp]")); } /*