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Does a lot of error checking now.

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FossilOrigin-Name: 9efb5330eea7b66ca2fcbe0c41826d40e3c8695a45dba8e656ff95a0cdad5b6c
This commit is contained in:
7u83@mail.ru 2014-08-17 09:36:49 +00:00
parent 4b43267800
commit 5bd63cdae9
1 changed files with 43 additions and 6 deletions
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49
src/capwap/hdr_print.c
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@ -32,11 +32,30 @@ int hdr_print(char *str, uint8_t *packet, int len)
char *s = str;
if (CWTH_GET_PREAMBLE(packet)==01){
if (len<1){
s+=sprintf(s,"\tNo info available.");
return s-str;
}
int preamble = 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 = CWTH_GET_HLEN(packet);
int rid = CWTH_GET_RID(packet);
@ -54,20 +73,38 @@ int hdr_print(char *str, uint8_t *packet, int len)
CWTH_GET_FLAG_K(packet)
);
if (len < 8){
s+=sprintf(s,"\tNo more data. Packet too short.");
return s-str;
}
int frag_id = CWTH_GET_FRAGID(packet);
int frag_offs = CWTH_GET_FRAGOFFSET(packet);
s+=sprintf(s,"\tFrag Id: %d, Frag Offs:: %d\n",frag_id,frag_offs);
int bhlen = 4*hlen;
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,"\tFrag Id: %d, Frag Offs:: %d\n",frag_id,frag_offs);
s+=sprintf(s,"\tMsgType: %d, SeqNum: %d, MsgelemLen:%d\n",msgtype,seqnum,msgelemlen);
s+=sprintf(s,", SeqNum: %d, MsgelemLen:%d\n",seqnum,msgelemlen);
return s-str;