Example #1
0
int netconn_process_packet(struct netconn *nc, uint8_t * packet, int len,
			struct sockaddr *from)
{
	char sock_buf[SOCK_ADDR_BUFSIZE];

/*//	cw_dbg_pkt_nc(DBG_PKT_IN, nc, packet, len, from);*/
	if (len < 8) {
		/* packet too short */
		cw_dbg(DBG_PKT_ERR,
		       "Discarding packet from %s, packet too short, len=%d,  at least 8 expected.",
		       sock_addr2str(&nc->addr,sock_buf), len);
		errno = EAGAIN;
		return -1;
	}

	int preamble = cw_get_hdr_preamble(packet);

	if ((preamble & 0xf0) != (CAPWAP_VERSION << 4)) {
		/* wrong version */
		cw_dbg(DBG_PKT_ERR,
		       "Discarding packet from %s, wrong version, version=%d, version %d expected.",
		       sock_addr2str(&nc->addr,sock_buf), (preamble & 0xf0) >> 4,
		       CAPWAP_VERSION);
		errno = EAGAIN;
		return -1;
	}
Example #2
0
int hdr_print(char *str, uint8_t *packet, int len)
{
	

	char *s = str;


	if (len<1){
		s+=sprintf(s,"\tNo info available.");
		return s-str;
	}

	int preamble = cw_get_hdr_preamble(packet); //CWTH_GET_PREAMBLE(packet);

	if (preamble==01){
		s+=sprintf(s,"\tEncrypted data.");
		return s-str;
	}

	if (preamble!=00){
		s+=sprintf(s,"\tWrong CAPWAP version or encryption type.");
		return s-str;
	}


	if (len < 4){
		s+=sprintf(s,"\tNo more data. Packet too short.");
		return s-str;
	}
	


	int hlen = cw_get_hdr_hlen(packet); //CWTH_GET_HLEN(packet);
	int rid = cw_get_hdr_rid(packet);
	int wbid = cw_get_hdr_wbid(packet);
	s+=sprintf(s,"\tHLEN: %d, RID: %02X, WBID %02X",hlen,rid,wbid);	



	s+=sprintf(s," Flags: (T=%d,F=%d,L=%d,W=%d,M=%d,K=%d)\n",
				cw_get_hdr_flag_t(packet),
				cw_get_hdr_flag_f(packet),
				cw_get_hdr_flag_l(packet),
				cw_get_hdr_flag_w(packet),
				cw_get_hdr_flag_m(packet),
				cw_get_hdr_flag_k(packet)
		);
	if (cw_get_hdr_flag_m(packet)){
		uint8_t * rmac = cw_get_hdr_rmac(packet);
		s+=sprintf(s,"\tRadio MAC: %s\n",sock_hwaddr2str(bstr_data(rmac),
				bstr_len(rmac)));

	}


	if (len < 8){
		s+=sprintf(s,"\tNo more data. Packet too short.");
		return s-str;
	}
	
	int frag_id = cw_get_hdr_fragid(packet);
	int frag_offs = cw_get_hdr_fragoffset(packet);
	s+=sprintf(s,"\tFrag Id: %d, Frag Offs:: %d\n",frag_id,frag_offs);


	int bhlen = 4*hlen;
	if (cw_get_hdr_flag_f(packet) && frag_offs!=0){
		s+=sprintf(s,"\tFragment data ...");
		return s-str;
	}

	
	if (len<bhlen+4){
		s+=sprintf(s,"\tNo more data. Packet too short.");
		return s-str;
	}


	int msgtype = ntohl(*((uint32_t*)(packet+bhlen)));
	s+=sprintf(s,"\tMsgType: %d",msgtype);

	if (len<bhlen+8){
		s+=sprintf(s,"\n\tNo more data. Packet too short.");
		return s-str;
	}

	int seqnum = (ntohl(*((uint32_t*)(packet+bhlen+4))))>>24;
	int msgelemlen = 0xFF & ((ntohl(*((uint32_t*)(packet+bhlen+4))))>>8);

	s+=sprintf(s,", SeqNum: %d, MsgelemLen:%d",seqnum,msgelemlen);


	return s-str;
}
Example #3
0
File: dbg.c Project: yskcg/actube
/**
 * Format a Packet Header
 */
int cw_format_pkt_hdr(char *dst,int level,struct conn *conn, uint8_t * packet, int len,struct sockaddr *from)
{
	char *s=dst;
	switch (level) {
		case DBG_PKT_IN:
			if (cw_get_hdr_flag_f(packet)){
				s+=sprintf(s,"Fragment from %s",sock_addr2str_p(from));
			}
			else{
				s+=sprintf(s,"From %s",sock_addr2str_p(from));
			}
			break;
		case DBG_PKT_OUT:
			if (cw_get_hdr_flag_f(packet)){
				s+=sprintf(s,"Fragment to %s",sock_addr2str(from));
			}
			else{
				s+=sprintf(s,"To %s",sock_addr2str(from));
			}
			break;
	}
	s+=sprintf(s," l=%d: ",len);

	int preamble = cw_get_hdr_preamble(packet); 
	if (preamble==01){
		s+=sprintf(s," (encrypted)");
		return s-dst;
	}

	if (len<4)
		goto abort;
		
/*		
	if (cw_get_hdr_flag_f(packet)){
		s+=sprintf(s," (fragmented)");
	}
*/
	int hlen = cw_get_hdr_hlen(packet); 
	int rid = cw_get_hdr_rid(packet);
	int wbid = cw_get_hdr_wbid(packet);
	s+=sprintf(s," H:%d R:%02d W:%02d",hlen,rid,wbid);


	s+=sprintf(s," Flgs:");
	s+=format_hdr_flags(s,packet);

	if (len<8)
		goto abort;
	int frag_id = cw_get_hdr_fragid(packet);
	int frag_offs = cw_get_hdr_fragoffset(packet);
	s+=sprintf(s," Frag/Offs:%d/%d",frag_id,frag_offs);


	if (cw_get_hdr_flag_m(packet)) {
		/* rmac is present, print the rmac */
		int rmac_len=cw_get_hdr_rmac_len(packet);
		int plen=rmac_len;
		if (rmac_len+8>len) 
			plen=len-8;
		if (rmac_len>10) 
			plen=10;
		
		s+=sprintf(s," R-MAC:");
		s+=format_mac(s,cw_get_hdr_rmac_data(packet),plen);
		if (rmac_len>10){
			s+=sprintf(s," ... (len=%d)",rmac_len);
		}
	}

	if (cw_get_hdr_flag_w(packet)){
		/* print wireless specific info */
		int ws_len = cw_get_hdr_ws_len(packet);
		int plen = ws_len > 20 ? 20:ws_len;
		s+=sprintf(s," WS:");
		s+=format_hexu(s,cw_get_hdr_ws_data(packet),plen);
		if (ws_len>20){
			s+=sprintf(s," ... (len=%d)",ws_len);
		}
	}

	

	return s-dst;	


	
abort:
	s+=sprintf(s," Incomplete...");
	return s-dst;

}