SGI Developer Toolbox 6.1/SGI Developer Toolbox 6.1 - Disc 4.iso/src/apps/xconf/ConfRouter.c++

C/C++ Source or Header | 1994-08-01 | 6KB | 260 lines

// Conf includefile
#include "ConfRouter.h"

// unix includes
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <malloc.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <bstring.h>
#include <CC/osfcn.h>
#include <netdb.h>
#include <arpa/inet.h>


ConfRouter::ConfRouter() {}


ConfRouter::~ConfRouter() {}


void ConfRouter::Init(int port)
{
   _port = port;
   _addrSize = sizeof(struct sockaddr_in);

   bzero(&_tcpSendAddr, _addrSize);
   _tcpSendAddr.sin_family = AF_INET;
   _tcpSendAddr.sin_port = htons(_port);
   _tcpSendAddr.sin_addr.s_addr = htonl(INADDR_ANY);

   bzero(&_tcpRecvAddr, _addrSize);
   _tcpRecvAddr.sin_family = AF_INET;
   _tcpRecvAddr.sin_port = htons(_port);
   _tcpRecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);

   bzero(&_udpSendAddr, _addrSize);
   _udpSendAddr.sin_family = AF_INET;
   _udpSendAddr.sin_port = htons(_port);
   _udpSendAddr.sin_addr.s_addr = htonl(INADDR_ANY);

   bzero(&_udpRecvAddr, _addrSize);
   _udpRecvAddr.sin_family = AF_INET;
   _udpRecvAddr.sin_port = htons(_port);
   _udpRecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);

   if(!setupTCP()) {
      printf("Error setting up TCP socket.\n");
      exit(-1);
   }
   if(!setupUDP()){
      printf("Error setting up UDP socket.\n");
      exit(-1);
   }
}


Boolean ConfRouter::setupTCP()
{
   _tcpSocket = socket(AF_INET, SOCK_STREAM, 0);
   if(_tcpSocket < 0) {
      perror("socket");
      return(FALSE);
   }

   if(bind(_tcpSocket, &_tcpRecvAddr, _addrSize) < 0) {
      perror("bind");
      return(FALSE);
   }

   if(listen(_tcpSocket, 5) < 0) {
      perror("listen");
      return(FALSE);
   }

   if(fcntl(_tcpSocket, F_SETFL, FASYNC) < 0) {
      perror("fcntl");
      return(FALSE);
   }

   if(fcntl(_tcpSocket, F_SETOWN, getpid()) < 0) {
      perror("fcntl");
      return(FALSE);
   }

   return(TRUE);
}


Boolean ConfRouter::setupUDP()
{
   _udpSocket = socket(AF_INET, SOCK_DGRAM, 0);
   if(_udpSocket < 0) {
      perror("socket");
      return(FALSE);
   }

   int on = 1;
   // doing this before the bind allows multiple bindings to this port
   if(setsockopt(_udpSocket, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) < 0) {
      perror("setsockopt(SO_REUSEPORT)");
      return(FALSE);
   }

   struct in_addr grpAddr;
   grpAddr.s_addr = inet_addr(XCONF_MCAST_GROUP);
   if(!IN_MULTICAST(grpAddr.s_addr)) {
      fprintf(stderr, "Invalid multicast group address.\n");
      return(FALSE);
   }

   // enable multicasting and limit # gateways packets will cross.
   u_char ttl = MAX_MCAST_HOPS;
   int sz = sizeof(ttl);
   if(setsockopt(_udpSocket, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sz) < 0) {
      perror("setsockopt(IP_MULTICAST_TTL)");
      return(FALSE);
   }
   _udpSendAddr.sin_addr = grpAddr;

   struct ip_mreq mreq;
   mreq.imr_multiaddr = grpAddr;
   struct in_addr ifAddr;
   ifAddr.s_addr = htonl(INADDR_ANY);
   mreq.imr_interface = ifAddr;
   sz = sizeof(mreq);
   if(setsockopt(_udpSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sz) < 0) {
      perror("setsockopt(IP_ADD_MEMBERSHIP)");
      return(FALSE);
   }

   if(bind(_udpSocket, &_udpRecvAddr, _addrSize) < 0) {
      perror("bind");
      return(FALSE);
   }

   if(fcntl(_udpSocket, F_SETFL, FASYNC) < 0) {
      perror("fcntl(F_SETFL)");
      return(FALSE);
   }
   if(fcntl(_udpSocket, F_SETOWN, getpid()) < 0) {
      perror("fcntl(F_SETOWN)");
      return(FALSE);
   }

   return(TRUE);
}


Boolean ConfRouter::handleTCP()
{
   struct Message msg;
   struct sockaddr_in f;
   int fromlen = sizeof(f);

   if(recvfrom(_tcpSocket, &msg, sizeof(msg), 0, &f, &fromlen) < 0) {
      perror("recv");
      return(FALSE);
   }

   printf("read TCP message.\n");

   int len = sizeof(msg) - sizeof(msg.data) + strlen(msg.data);

   if(sendto(_udpSocket, &msg, len, 0, &_udpSendAddr, _addrSize) < 0) {
      perror("send");
      return(FALSE);
   }
   bzero(msg.data, sizeof(msg.data));

   printf("sent UDP message.\n\n");
   return(TRUE);
}


Boolean ConfRouter::handleUDP()
{
   struct Message msg;
   struct sockaddr_in f;
   int fromlen = sizeof(f);

   if(recvfrom(_udpSocket, &msg, sizeof(msg), 0, &f, &fromlen) < 0) {
      perror("recvfrom");
      return(FALSE);
   }

   printf("read UDP message.\n");

   int len = sizeof(msg) - sizeof(msg.data) + strlen(msg.data);

   if(send(_tcpSocket, &msg, len, 0) < 0) {
      perror("sendto");
      return(FALSE);
   }
   bzero(msg.data, sizeof(msg.data));

   printf("sent TCP message.\n\n");
   return(TRUE);
}


void ConfRouter::Run()
{
   int newsock;

   for(;;) {
      newsock = accept(_tcpSocket, NULL, NULL);


printf("new connection\n");

      if(!fork()) {
         // child process
         signal(SIGPOLL, SIG_IGN);

         close(_tcpSocket);
         _tcpSocket = newsock;
         int nfds = _tcpSocket + 1;

         fd_set readfds;
         FD_ZERO(&readfds);

         for(;;) {
            FD_SET(_tcpSocket, &readfds);
            FD_SET(_udpSocket, &readfds);

            if(select(nfds, &readfds, (fd_set*)0, (fd_set*)0, (struct timeval*)0) < 0) {
               perror("select");
               exit(-1);
            }

printf("select occured\n");

            if(FD_ISSET(_tcpSocket, &readfds)) {
               handleTCP();
            }
            if(FD_ISSET(_udpSocket, &readfds)) {
               handleUDP();
            }
         }
      }
      else {
         // parent process
         close(newsock);
      }
   }
}


void ConfRouter::Quit()
{
   close(_tcpSocket);
   close(_udpSocket);
   exit(1);
}