116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include "capwap.h"
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int hdr_print(char *str, uint8_t *packet, int len)
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{
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char *s = str;
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if (len<1){
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s+=sprintf(s,"\tNo info available.");
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return s-str;
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}
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int preamble = CWTH_GET_PREAMBLE(packet);
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if (preamble==01){
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s+=sprintf(s,"\tEncrypted data.");
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return s-str;
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}
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if (preamble!=00){
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s+=sprintf(s,"\tWrong CAPWAP version or encryption type.");
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return s-str;
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}
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if (len < 4){
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s+=sprintf(s,"\tNo more data. Packet too short.");
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return s-str;
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}
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int hlen = CWTH_GET_HLEN(packet);
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int rid = CWTH_GET_RID(packet);
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int wbid = CWTH_GET_WBID(packet);
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s+=sprintf(s,"\tHLEN: %d, RID: %02X, WBID %02X",hlen,rid,wbid);
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s+=sprintf(s," Flags: (T=%d,F=%d,L=%d,W=%d,M=%d,K=%d)\n",
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CWTH_GET_FLAG_T(packet),
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CWTH_GET_FLAG_F(packet),
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CWTH_GET_FLAG_L(packet),
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CWTH_GET_FLAG_W(packet),
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CWTH_GET_FLAG_M(packet),
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CWTH_GET_FLAG_K(packet)
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);
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if (len < 8){
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s+=sprintf(s,"\tNo more data. Packet too short.");
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return s-str;
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}
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int frag_id = CWTH_GET_FRAGID(packet);
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int frag_offs = CWTH_GET_FRAGOFFSET(packet);
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s+=sprintf(s,"\tFrag Id: %d, Frag Offs:: %d\n",frag_id,frag_offs);
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int bhlen = 4*hlen;
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if (CWTH_GET_FLAG_F(packet) && frag_offs!=0){
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s+=sprintf(s,"\tFragment data ...");
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return s-str;
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}
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if (len<bhlen+4){
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s+=sprintf(s,"\tNo more data. Packet too short.");
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return s-str;
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}
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int msgtype = ntohl(*((uint32_t*)(packet+bhlen)));
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s+=sprintf(s,"\tMsgType: %d",msgtype);
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if (len<bhlen+8){
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s+=sprintf(s,"\n\tNo more data. Packet too short.");
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return s-str;
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}
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int seqnum = (ntohl(*((uint32_t*)(packet+bhlen+4))))>>24;
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int msgelemlen = 0xFF & ((ntohl(*((uint32_t*)(packet+bhlen+4))))>>8);
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s+=sprintf(s,", SeqNum: %d, MsgelemLen:%d",seqnum,msgelemlen);
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return s-str;
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}
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