* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
- * Support for the Light Weight Access Point Protocol as per draft-ohara-capwap-lwapp-04
- *
*/
-#ifndef lint
-static const char rcsid[] _U_ =
-"@(#) $Header: /tcpdump/master/tcpdump/print-lwapp.c,v 1.1 2007-07-24 16:07:30 hannes Exp $";
-#endif
+/* \summary: Light Weight Access Point Protocol (LWAPP) printer */
+
+/* specification: RFC 5412 */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "interface.h"
+#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"
-/*
+
+/*
* LWAPP transport (common) header
* 0 1 2 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
*/
struct lwapp_transport_header {
- u_int8_t version;
- u_int8_t frag_id;
- u_int8_t length[2];
- u_int16_t status;
+ nd_uint8_t version;
+ nd_uint8_t frag_id;
+ nd_uint16_t length;
+ nd_uint16_t status;
};
/*
*/
struct lwapp_control_header {
- u_int8_t msg_type;
- u_int8_t seq_num;
- u_int8_t len[2];
- u_int8_t session_id[4];
+ nd_uint8_t msg_type;
+ nd_uint8_t seq_num;
+ nd_uint16_t len;
+ nd_uint32_t session_id;
};
#define LWAPP_VERSION 0
-#define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
-#define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
-#define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
+#define LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
+#define LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
+#define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)
static const struct tok lwapp_header_bits_values[] = {
{ 0x01, "Last Fragment Bit"},
{ 0, NULL}
};
-/*
+/*
* LWAPP message elements
- *
+ *
* 0 1 2 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct lwapp_message_header {
- u_int8_t type;
- u_int8_t length[2];
+ nd_uint8_t type;
+ nd_uint16_t length;
};
void
-lwapp_control_print(const u_char *pptr, u_int len, int has_ap_ident) {
-
+lwapp_control_print(netdissect_options *ndo,
+ const u_char *pptr, u_int len, int has_ap_ident)
+{
const struct lwapp_transport_header *lwapp_trans_header;
const struct lwapp_control_header *lwapp_control_header;
const u_char *tptr;
- int hexdump,tlen;
- int msg_tlen;
+ uint8_t version;
+ u_int tlen;
+ u_int msg_type, msg_tlen;
+ ndo->ndo_protocol = "lwapp_control";
tptr=pptr;
if (has_ap_ident) {
/* check if enough bytes for AP identity */
- if (!TTEST2(*tptr, 6))
- goto trunc;
+ ND_TCHECK_6(tptr);
lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
} else {
lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
}
- TCHECK(*lwapp_trans_header);
+ ND_TCHECK_SIZE(lwapp_trans_header);
+ version = GET_U_1(lwapp_trans_header->version);
/*
* Sanity checking of the header.
*/
- if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
- printf("LWAPP version %u packet not supported",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version));
+ if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) {
+ ND_PRINT("LWAPP version %u packet not supported",
+ LWAPP_EXTRACT_VERSION(version));
return;
}
/* non-verbose */
- if (vflag < 1) {
- printf("LWAPPv%u, %s frame, Flags [%s], length %u",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
- LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
- bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
+ if (ndo->ndo_vflag < 1) {
+ ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u",
+ LWAPP_EXTRACT_VERSION(version),
+ LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
+ bittok2str(lwapp_header_bits_values,"none",version&0x07),
len);
return;
}
/* ok they seem to want to know everything - lets fully decode it */
- tlen=EXTRACT_16BITS(lwapp_trans_header->length);
-
- printf("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
- LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
- LWAPP_EXTRACT_RID(lwapp_trans_header->version),
- bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
- lwapp_trans_header->frag_id,
+ tlen=GET_BE_U_2(lwapp_trans_header->length);
+
+ ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
+ LWAPP_EXTRACT_VERSION(version),
+ LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
+ LWAPP_EXTRACT_RID(version),
+ bittok2str(lwapp_header_bits_values,"none",version&0x07),
+ GET_U_1(lwapp_trans_header->frag_id),
tlen);
if (has_ap_ident) {
- printf("\n\tAP identity: %s",
- etheraddr_string(tptr));
- tptr+=sizeof(const struct lwapp_transport_header)+6;
+ ND_PRINT("\n\tAP identity: %s", GET_ETHERADDR_STRING(tptr));
+ tptr+=sizeof(struct lwapp_transport_header)+6;
} else {
- tptr+=sizeof(const struct lwapp_transport_header);
+ tptr+=sizeof(struct lwapp_transport_header);
}
- while(tlen>0) {
+ while(tlen!=0) {
/* did we capture enough for fully decoding the object header ? */
- if (!TTEST2(*tptr, sizeof(struct lwapp_control_header)))
- goto trunc;
+ ND_TCHECK_LEN(tptr, sizeof(struct lwapp_control_header));
+ if (tlen < sizeof(struct lwapp_control_header)) {
+ ND_PRINT("\n\t Msg goes past end of PDU");
+ break;
+ }
lwapp_control_header = (const struct lwapp_control_header *)tptr;
- msg_tlen = EXTRACT_16BITS(lwapp_control_header->len);
+ msg_tlen = GET_BE_U_2(lwapp_control_header->len);
+ if (tlen < sizeof(struct lwapp_control_header) + msg_tlen) {
+ ND_PRINT("\n\t Msg goes past end of PDU");
+ break;
+ }
- /* print message header */
- printf("\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %d, Session: 0x%08x",
- tok2str(lwapp_msg_type_values,"Unknown",lwapp_control_header->msg_type),
- lwapp_control_header->msg_type,
- lwapp_control_header->seq_num,
+ /* print message header */
+ msg_type = GET_U_1(lwapp_control_header->msg_type);
+ ND_PRINT("\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %u, Session: 0x%08x",
+ tok2str(lwapp_msg_type_values,"Unknown",msg_type),
+ msg_type,
+ GET_U_1(lwapp_control_header->seq_num),
msg_tlen,
- EXTRACT_32BITS(lwapp_control_header->session_id));
+ GET_BE_U_4(lwapp_control_header->session_id));
/* did we capture enough for fully decoding the message */
- if (!TTEST2(*tptr, msg_tlen))
- goto trunc;
- hexdump=FALSE;
+ ND_TCHECK_LEN(tptr, msg_tlen);
/* XXX - Decode sub messages for each message */
- switch(lwapp_control_header->msg_type) {
+ switch(msg_type) {
case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
case LWAPP_MSGTYPE_JOIN_REQUEST:
}
return;
- trunc:
- printf("\n\t\t packet exceeded snapshot");
+trunc:
+ nd_print_trunc(ndo);
}
void
-lwapp_data_print(const u_char *pptr, u_int len) {
-
+lwapp_data_print(netdissect_options *ndo,
+ const u_char *pptr, u_int len)
+{
const struct lwapp_transport_header *lwapp_trans_header;
const u_char *tptr;
- int tlen;
+ u_int tlen;
+ u_int version;
+ ndo->ndo_protocol = "lwapp_data";
tptr=pptr;
/* check if enough bytes for AP identity */
- if (!TTEST2(*tptr, 6))
- goto trunc;
+ ND_TCHECK_6(tptr);
lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
- TCHECK(*lwapp_trans_header);
+ ND_TCHECK_SIZE(lwapp_trans_header);
+ version = GET_U_1(lwapp_trans_header->version);
/*
* Sanity checking of the header.
*/
- if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
- printf("LWAPP version %u packet not supported",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version));
+ if (LWAPP_EXTRACT_VERSION(version) != LWAPP_VERSION) {
+ ND_PRINT("LWAPP version %u packet not supported",
+ LWAPP_EXTRACT_VERSION(version));
return;
}
/* non-verbose */
- if (vflag < 1) {
- printf("LWAPPv%u, %s frame, Flags [%s], length %u",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
- LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
- bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
+ if (ndo->ndo_vflag < 1) {
+ ND_PRINT("LWAPPv%u, %s frame, Flags [%s], length %u",
+ LWAPP_EXTRACT_VERSION(version),
+ LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
+ bittok2str(lwapp_header_bits_values,"none",version&0x07),
len);
return;
}
/* ok they seem to want to know everything - lets fully decode it */
- tlen=EXTRACT_16BITS(lwapp_trans_header->length);
-
- printf("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
- LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
- LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
- LWAPP_EXTRACT_RID(lwapp_trans_header->version),
- bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
- lwapp_trans_header->frag_id,
+ tlen=GET_BE_U_2(lwapp_trans_header->length);
+ if (tlen < sizeof(struct lwapp_transport_header)) {
+ ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], length %u < transport header length",
+ LWAPP_EXTRACT_VERSION(version),
+ LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
+ LWAPP_EXTRACT_RID(version),
+ bittok2str(lwapp_header_bits_values,"none",version&0x07),
+ tlen);
+ return;
+ }
+
+ ND_PRINT("LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
+ LWAPP_EXTRACT_VERSION(version),
+ LWAPP_EXTRACT_CONTROL_BIT(version) ? "Control" : "Data",
+ LWAPP_EXTRACT_RID(version),
+ bittok2str(lwapp_header_bits_values,"none",version&0x07),
+ GET_U_1(lwapp_trans_header->frag_id),
tlen);
- tptr+=sizeof(const struct lwapp_transport_header);
- tlen-=sizeof(const struct lwapp_transport_header);
+ tptr+=sizeof(struct lwapp_transport_header);
+ tlen-=sizeof(struct lwapp_transport_header);
/* FIX - An IEEE 802.11 frame follows - hexdump for now */
- print_unknown_data(tptr, "\n\t", tlen);
+ print_unknown_data(ndo, tptr, "\n\t", tlen);
return;
- trunc:
- printf("\n\t\t packet exceeded snapshot");
+trunc:
+ nd_print_trunc(ndo);
}
-
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff