Update and cleanup

- created raw socket class
- moved udp recv via msg to a derived class
- option file read optimized

src/cudpmsgsocket.cpp

@@ -0,0 +1,102 @@
+//
+//  cudpmsgsocket.cpp
+//  xlxd
+//
+//  Created by Marius Petrescu (YO2LOJ) on 22/02/2020.
+//  Copyright © 2020 Marius Petrescu (YO2LOJ). All rights reserved.
+//
+// ----------------------------------------------------------------------------
+//    This file is part of xlxd.
+//
+//    xlxd is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    xlxd is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with Foobar.  If not, see <http://www.gnu.org/licenses/>. 
+// ----------------------------------------------------------------------------
+
+#include "main.h"
+#include <string.h>
+#include "cudpmsgsocket.h"
+
+////////////////////////////////////////////////////////////////////////////////////////
+// read
+
+int CUdpMsgSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
+{
+    struct sockaddr_in Sin;
+    fd_set FdSet;
+    unsigned int uiFromLen = sizeof(struct sockaddr_in);
+    int iRecvLen = -1;
+    struct timeval tv;
+
+    struct msghdr Msg;
+    struct iovec Iov[1];
+
+    union {
+         struct cmsghdr cm;
+         unsigned char pktinfo_sizer[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
+    } Control;
+
+    // socket valid ?
+    if ( m_Socket != -1 )
+    {
+        // allocate buffer
+        Buffer->resize(UDP_MSG_BUFFER_LENMAX);
+
+        //prepare msghdr
+        bzero(&Msg, sizeof(Msg));
+        Iov[0].iov_base = Buffer->data();
+        Iov[0].iov_len = UDP_MSG_BUFFER_LENMAX;
+
+        bzero(&Sin, sizeof(Sin));
+        Msg.msg_name = &Sin;
+        Msg.msg_namelen = sizeof(Sin);
+        Msg.msg_iov = Iov;
+        Msg.msg_iovlen = 1;
+        Msg.msg_control = &Control;
+        Msg.msg_controllen = sizeof(Control);
+
+        // control socket
+        FD_ZERO(&FdSet);
+        FD_SET(m_Socket, &FdSet);
+        tv.tv_sec = timeout / 1000;
+        tv.tv_usec = (timeout % 1000) * 1000;
+        select(m_Socket + 1, &FdSet, 0, 0, &tv);
+        
+        // read
+        iRecvLen = (int)recvmsg(m_Socket, &Msg, 0);
+        
+        // handle
+        if ( iRecvLen != -1 )
+        {
+            // adjust buffer size
+            Buffer->resize(iRecvLen);
+            
+            // get IP
+            Ip->SetSockAddr(&Sin);
+
+            // get local IP
+            struct cmsghdr *Cmsg;
+            for (Cmsg = CMSG_FIRSTHDR(&Msg); Cmsg != NULL; Cmsg = CMSG_NXTHDR(&Msg, Cmsg))
+            {
+                if (Cmsg->cmsg_level == IPPROTO_IP && Cmsg->cmsg_type == IP_PKTINFO)
+                {
+                    struct in_pktinfo *PktInfo = (struct in_pktinfo *)CMSG_DATA(Cmsg);
+                    m_LocalAddr.s_addr = PktInfo->ipi_spec_dst.s_addr;
+                }
+            }
+        }
+    }
+ 
+    // done
+    return iRecvLen;
+}
+