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Added new funtion cw_send_msg w/o side effects

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FossilOrigin-Name: a1ba8652a977192d847b140d512635be15680ed059e77f0aeb82d64a2c654283
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root 2020-04-02 05:25:56 +00:00
parent ebda2ed384
commit ef0474f0dd
1 changed files with 73 additions and 0 deletions
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73
src/cw/send.c
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@ -91,6 +91,79 @@ int conn_send_data_msg(struct conn * conn, uint8_t *rawmsg,int len)
}
#define MAX_MTU 1500
int
cw_send_msg( struct conn * conn, uint8_t *msg)
{
uint8_t buf[MAX_MTU];
int fragoffset,hlen,mtu;
int packetlen, msglen;
mtu = conn->mtu;
/* align mtu to 8 */
mtu &= ~3;
/* zero the first 8 bytes */
cw_set_dword(buf + 0, 0);
cw_set_dword(buf + 4, 0);
/* unencrypted */
cw_set_hdr_preamble(buf, CAPWAP_VERSION << 4 | 0);
/* set rmac, wireless binding id, and radio id */
cw_set_hdr_rmac(buf, conn->base_rmac);
cw_set_hdr_wbid(buf, conn->wbid);
cw_set_hdr_rid(buf, 0);
fragoffset = 0;
hlen = cw_get_hdr_hlen(buf)*4;
packetlen = hlen + cw_get_msg_elems_len(msg) + 8;
msglen = cw_get_msg_elems_len(msg) + 8;
while (msglen + hlen > mtu){
memcpy(buf+hlen,msg+(fragoffset*8),mtu-hlen);
msglen -= (mtu - hlen);
cw_set_hdr_flags(buf,CAPWAP_FLAG_HDR_F,1);
cw_set_dword(buf+4, conn->fragid<<16 | fragoffset<<3 );
cw_dbg_pkt(DBG_PKT_OUT,conn,buf,mtu,(struct sockaddr*)&conn->addr);
if (conn->write(conn,buf,mtu)<0)
return -1;
fragoffset+=(mtu-hlen)/8;
cw_set_hdr_flags(buf,CAPWAP_FLAG_HDR_M,0);
cw_set_hdr_flags(buf,CAPWAP_FLAG_HDR_W,0);
hlen = 8;
cw_set_hdr_hlen(buf,hlen/4);
}
if (fragoffset)
cw_set_hdr_flags(buf,CAPWAP_FLAG_HDR_F | CAPWAP_FLAG_HDR_L,1);
else
cw_set_hdr_flags(buf,CAPWAP_FLAG_HDR_F,0);
memcpy(buf+hlen,msg+(fragoffset*8),mtu-hlen);
cw_set_dword(buf+4, conn->fragid<<16 | fragoffset<<3 );
cw_dbg_pkt(DBG_PKT_OUT,conn,buf,packetlen,(struct sockaddr*)&conn->addr);
return conn->write(conn,buf,msglen + hlen);
printf("packetlen = %d (%d)\n",packetlen,hlen);
exit(0);
}