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net-ip.cpp

/*-
 * Copyright (c) 1993-1994 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and the Network Research Group at
 *      Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
static const char rcsid[] =
    "@(#) $Header: /cs/research/mice/starship/src/local/CVS_repository/vic/net/net-ip.cpp,v 1.6 2000/03/07 16:04:42 piers Exp $ (LBL)";

#include <stdio.h>
#include <errno.h>
#include <string.h>
#ifdef WIN32
#include <io.h>
#define close closesocket
#else
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#endif
#if defined(sun) && defined(__svr4__)
#include <sys/systeminfo.h>
#endif

#include "config.h"
#include "net.h"
#include "vic_tcl.h"

#include "net-addr.h"

#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN (16)
#endif

class IPAddress : public Address {
public:
      IPAddress() { text_ = new char[INET_ADDRSTRLEN]; text_[0]='\0';}
      virtual int operator=(const char* text);
      int operator=(const struct in_addr& addr);

      virtual Address* copy() const;
      virtual size_t length() const { return sizeof(addr_); }
      virtual operator const void*() const { return &addr_; }

      operator struct in_addr() const { return addr_; }
      operator const struct in_addr&() const { return addr_; }
      operator u_int32_t() const { return addr_.s_addr; }

private:
      struct in_addr addr_;
};


static class IPAddressType : public AddressType {
public:
  virtual Address* resolve(const char* name) {
    struct in_addr addr;
    IPAddress * result = 0;
    if((addr.s_addr = LookupHostAddr(name)) != 0) {
      result = new IPAddress;
      *result = addr;
    } else {
      result = 0;
    }
    return (result);
  }
} ip_address_type;


class IPNetwork : public Network {
    public:
            IPNetwork() : Network(*(new IPAddress), *(new IPAddress)) {;}
      virtual int command(int argc, const char*const* argv);
      virtual void reset();
      virtual Address* alloc(const char* name) { 
            struct in_addr addr;
            IPAddress * result = 0;
            if((addr.s_addr = LookupHostAddr(name)) != 0) {
              result = new IPAddress;
              *result = addr;
            } else {
              result = 0;
            }
            return (result);
      }
    protected:
      virtual int dorecv(u_char* buf, int len, Address &from, int fd);
      int open(const char * host, int port, int ttl);
      int close();
      int localname(sockaddr_in*);
      int openssock(Address & addr, u_short port, int ttl);
      int openrsock(Address & addr, u_short port, Address & local);
      time_t last_reset_;
};

static class IPNetworkMatcher : public Matcher {
    public:
      IPNetworkMatcher() : Matcher("network") {}
      TclObject* match(const char* id) {
            if (strcasecmp(id, "ip") == 0)
                  return (new IPNetwork);
            else
                  return (0);
      }
} nm_ip;


Address * IPAddress::copy() const {
  IPAddress * result = new IPAddress;
  *result = addr_;
  return (result);
}

int IPAddress::operator=(const char* text) {
  addr_.s_addr = LookupHostAddr(text);
  strcpy(text_, intoa(addr_.s_addr));
  return (0);
}

int IPAddress::operator=(const struct in_addr& addr) {
  memcpy(&addr_, &addr, sizeof(addr));
  strcpy(text_, intoa(addr_.s_addr));
  return (0);
}

int IPNetwork::command(int argc, const char*const* argv)
{
      Tcl& tcl = Tcl::instance();
      if (argc == 2) {
            if (strcmp(argv[1], "close") == 0) {
                  close();
                  return (TCL_OK);
            }
            char* cp = tcl.result();
            if (strcmp(argv[1], "addr") == 0) {
                  strcpy(cp, addr_);
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "interface") == 0) {
                  strcpy(cp, local_);
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "port") == 0) {
                  sprintf(cp, "%d", ntohs(port_));
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "localport") == 0) {
                  sprintf(cp, "%d", ntohs(lport_));
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "ttl") == 0) {
                  sprintf(cp, "%d", ttl_);
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "ismulticast") == 0) {
                  u_int32_t addri = (IPAddress&)addr_;
                  tcl.result(IN_CLASSD(ntohl(addri))? "1" : "0");
                  return (TCL_OK);
            }
      } else if (argc == 3) {
            if (strcmp(argv[1], "loopback") == 0) {
                  char c = atoi(argv[2]);
                  if (setsockopt(ssock_, IPPROTO_IP, IP_MULTICAST_LOOP,
                               &c, 1) < 0) {
                        /*
                         * If we cannot turn off loopback (Like on the
                         * Microsoft TCP/IP stack), then declare this
                         * option broken so that our packets can be
                         * filtered on the recv path.
                         */
                        if (c == 0)
                              noloopback_broken_ = 1;
                  }
                  return (TCL_OK);
            }
      } else if (argc == 5) {
            if (strcmp(argv[1], "open") == 0) {
                  int port = htons(atoi(argv[3]));
                  int ttl = atoi(argv[4]);
                  if (strlen(tcl.attr("ifAddr"))>1)
                        (IPAddress&)local_ = tcl.attr("ifAddr");
                  if (open(argv[2], port, ttl) < 0)
                        tcl.result("0");
                  else
                        tcl.result("1");
                  return (TCL_OK);
            }
      }
      return (Network::command(argc, argv));
}

int IPNetwork::open(const char * host, int port, int ttl)
{
      addr_ = host;
      port_ = port;
      ttl_ = ttl;

      ssock_ = openssock(addr_, port, ttl);
      if (ssock_ < 0)
            return (-1);
      /*
       * Connecting the send socket also bound the local address.
       * On a multihomed host we need to bind the receive socket
       * to the same local address the kernel has chosen to send on.
       */
      sockaddr_in local;
      if (localname(&local) < 0) {
            return (-1);
      }
      (IPAddress&)local_ = local.sin_addr;
      rsock_ = openrsock(addr_, port, local_);
      if (rsock_ < 0) {
            (void)::close(ssock_);
            return (-1);
      }

      lport_ = local.sin_port;
      last_reset_ = 0;
      return (0);
}

int IPNetwork::close()
{
      if (ssock_ >= 0) {
            ::close(ssock_);
            ::close(rsock_);
            ssock_ = rsock_ = -1;
      }
      return (0);
}

int IPNetwork::localname(sockaddr_in* p)
{
      memset((char *)p, 0, sizeof(*p));
      p->sin_family = AF_INET;
#ifndef WIN32
      unsigned int len = sizeof(*p), result =0;
#else
      int len = sizeof(*p), result =0;
#endif

      if ((result = getsockname(ssock_, (struct sockaddr *)p, &len)) < 0) {
            perror("getsockname");
            p->sin_addr.s_addr = 0;
            p->sin_port = 0;
      }
      // Use Local interface name if already set via command line
      if (((const char*)local_)[0]!='\0') {
            p->sin_addr.s_addr=(IPAddress&)local_;
            return (0);
      }

      if (p->sin_addr.s_addr == 0) {
            p->sin_addr.s_addr = LookupLocalAddr();
            result = ((p->sin_addr.s_addr != 0) ? (0) : (-1));
      }

      return (result);
}

void IPNetwork::reset()
{
      time_t t = time(0);
      int d = int(t - last_reset_);
      if (d > 3) {
            last_reset_ = t;
            (void)::close(ssock_);
            ssock_ = openssock(addr_, port_, ttl_);
      }
}

int IPNetwork::openrsock(Address & addr, u_short port, Address & local)
{
      int fd;
      struct sockaddr_in sin;

      u_int32_t addri = (IPAddress&)addr;
      u_int32_t locali = (IPAddress&)local;

      fd = socket(AF_INET, SOCK_DGRAM, 0);
      if (fd < 0) {
            perror("socket");
            exit(1);
      }
      nonblock(fd);
      int on = 1;
      if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
                  sizeof(on)) < 0) {
            perror("SO_REUSEADDR");
      }
#ifdef SO_REUSEPORT
      on = 1;
      if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char *)&on,
                   sizeof(on)) < 0) {
            perror("SO_REUSEPORT");
            exit(1);
      }
#endif
      memset((char *)&sin, 0, sizeof(sin));
      sin.sin_family = AF_INET;
      sin.sin_port = port;
#ifdef IP_ADD_MEMBERSHIP
      if (IN_CLASSD(ntohl(addri))) {
            /*
             * Try to bind the multicast address as the socket
             * dest address.  On many systems this won't work
             * so fall back to a destination of INADDR_ANY if
             * the first bind fails.
             */
            sin.sin_addr.s_addr = addri;
            if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                  sin.sin_addr.s_addr = INADDR_ANY;
                  if (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
                        perror("bind");
                        exit(1);
                  }
            }
            /* 
             * XXX This is bogus multicast setup that really
             * shouldn't have to be done (group membership should be
             * implicit in the IP class D address, route should contain
             * ttl & no loopback flag, etc.).  Steve Deering has promised
             * to fix this for the 4.4bsd release.  We're all waiting
             * with bated breath.
             */
            struct ip_mreq mr;

            mr.imr_multiaddr.s_addr = addri;
            mr.imr_interface.s_addr = INADDR_ANY;
            if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 
                         (char *)&mr, sizeof(mr)) < 0) {
                  perror("IP_ADD_MEMBERSHIP");
                  exit(1);
            }
      } else
#endif
      {
            /*
             * bind the local host's address to this socket.  If that
             * fails, another vic probably has the addresses bound so
             * just exit.
             */
            sin.sin_addr.s_addr = locali;
            if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                  perror("bind");
                  exit(1);
            }
            /*
             * Despite several attempts on our part to get this fixed,
             * Microsoft Windows isn't complient with the Internet Host
             * Requirements standard (RFC-1122) and won't let us include
             * the source address in the receive socket demux state.
             * (The consequence of this is that all conversations have
             * to be assigned a unique local port so the vat 'side
             * conversation' (middle click on site name) function is
             * essentially useless under windows.)
             */
#ifndef WIN32
            /*
             * (try to) connect the foreign host's address to this socket.
             */
            sin.sin_port = 0;
            sin.sin_addr.s_addr = (IPAddress&)addr;
            connect(fd, (struct sockaddr *)&sin, sizeof(sin));
#endif
      }
      /*
       * XXX don't need this for the session socket.
       */   
      int bufsize = 80 * 1024;
      if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&bufsize,
                  sizeof(bufsize)) < 0) {
            bufsize = 32 * 1024;
            if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&bufsize,
                        sizeof(bufsize)) < 0)
                  perror("SO_RCVBUF");
      }
      return (fd);
}

int IPNetwork::openssock(Address & addr, u_short port, int ttl)
{
      int fd;
      struct sockaddr_in sin;

      u_int32_t addri = (IPAddress&)addr;

      fd = socket(AF_INET, SOCK_DGRAM, 0);
      if (fd < 0) {
            perror("socket");
            exit(1);
      }
      nonblock(fd);


#ifdef WIN32
      memset((char *)&sin, 0, sizeof(sin));
      sin.sin_family = AF_INET;
      sin.sin_port = 0;
      sin.sin_addr.s_addr = INADDR_ANY;
      if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
            perror("bind");
            exit(1);
      }
#endif
      memset((char *)&sin, 0, sizeof(sin));
      sin.sin_family = AF_INET;
      sin.sin_port = port;
      sin.sin_addr.s_addr = addri;
      if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
            perror("connect");
            exit(1);
      }
      if (IN_CLASSD(ntohl(addri))) {
#ifdef IP_ADD_MEMBERSHIP
            char c;

            /* turn off loopback */
            c = 0;
            if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &c, 1) < 0) {
                  /*
                   * If we cannot turn off loopback (Like on the
                   * Microsoft TCP/IP stack), then declare this
                   * option broken so that our packets can be
                   * filtered on the recv path.
                   */
                  if (c == 0)
                        noloopback_broken_ = 1;
            }
            /* set the multicast TTL */
#ifdef WIN32
            u_int t;
#else
            u_char t;
#endif
            t = (ttl > 255) ? 255 : (ttl < 0) ? 0 : ttl;
            if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
                         (char*)&t, sizeof(t)) < 0) {
                  perror("IP_MULTICAST_TTL");
                  exit(1);
            }
            /* Slightly nasty one here - set Mcast iface if local inteface
             * is specified on command line
             */
            if (((const char*)local_)[0]!='\0') {
                  u_int32_t locali = (IPAddress&)local_;
                  if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
                                       (char*)&locali, sizeof(locali)) < 0) {
                        perror("IP_MULTICAST_IF");
                  }
            }


#else
            fprintf(stderr, "\
not compiled with support for IP multicast\n\
you must specify a unicast destination\n");
            exit(1);
#endif
      }
      /*
       * XXX don't need this for the session socket.
       */
      int bufsize = 80 * 1024;
      if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&bufsize,
                   sizeof(bufsize)) < 0) {
            bufsize = 48 * 1024;
            if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&bufsize,
                         sizeof(bufsize)) < 0)
                  perror("SO_SNDBUF");
      }
      return (fd);
}



int IPNetwork::dorecv(u_char* buf, int len, Address & from, int fd)
{
      sockaddr_in sfrom;
#ifndef WIN32
      unsigned int fromlen = sizeof(sfrom);
#else
      int fromlen = sizeof(sfrom);
#endif
      int cc = ::recvfrom(fd, (char*)buf, len, 0,
                      (sockaddr*)&sfrom, &fromlen);
      if (cc < 0) {
            if (errno != EWOULDBLOCK)
                  perror("recvfrom");
            return (-1);
      }
      (IPAddress&)from = sfrom.sin_addr;

      if (noloopback_broken_ && from == local_ && sfrom.sin_port == lport_)
            return (0);

      return (cc);
}

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