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;
}
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;
}
/**
* 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;
}