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/////////////////////////////////////////////////////////////////////////
// $Id: eth_socket.cc 13160 2017-03-30 18:08:15Z vruppert $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2003 by Mariusz Matuszek [NOmrmmSPAM @ users.sourceforge.net]
// Copyright (C) 2017 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// Mariusz Matuszek wrote the original version of eth_socket.cc based on
// eth_linux.cc.
//
// problems and limitations:
// - external program 'bxhub' is required
// - sends big packets using UDP, so only localhost is likely to work
// - author definitely doesn't know C++ and generally doesn't know what
// he is doing :)
//
// the idea is to provide a software multiport 'ethernet hub' and allow
// communication between multiple bochs instances on the same machine
// entirely in userspace and without need for root privileges.
//
// The config line in .bochsrc should look like:
//
// ne2k: ioaddr=0x280, irq=10, mac=00:a:b:c:1:2, ethmod=socket, ethdev=<socknum>
//
// e.g.
//
// ne2k: ioaddr=0x280, irq=10, mac=00:a:b:c:1:2, ethmod=socket, ethdev=40000
//
// this module will bind to 127.0.0.1:<socknum> for RX packets
// TX packets will be sent to 127.0.0.1:<socknum + 1>
// Extensions by Volker Ruppert (2017):
// - Windows support
// - Support for connecting other machine using format 'host:port'.
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "iodev.h"
#include "netmod.h"
#if BX_NETWORKING && BX_NETMOD_SOCKET
// network driver plugin entry points
int CDECL libsocket_net_plugin_init(plugin_t *plugin, plugintype_t type)
{
// Nothing here yet
return 0; // Success
}
void CDECL libsocket_net_plugin_fini(void)
{
// Nothing here yet
}
// network driver implementation
#define LOG_THIS netdev->
extern "C" {
#ifdef WIN32
#include <winsock2.h>
#else
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netpacket/packet.h>
#include <netinet/in.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <linux/types.h>
#include <netdb.h>
#define closesocket(s) close(s)
typedef int SOCKET;
#ifndef INVALID_SOCKET
#define INVALID_SOCKET -1
#endif
#endif
};
#ifdef WIN32
#define MSG_NOSIGNAL 0
#define MSG_DONTWAIT 0
#endif
#define BX_PACKET_POLL 1000 // Poll for a frame every 1000 usecs
//
// Define the class. This is private to this module
//
class bx_socket_pktmover_c : public eth_pktmover_c {
public:
bx_socket_pktmover_c(const char *netif, const char *macaddr,
eth_rx_handler_t rxh,
eth_rx_status_t rxstat,
bx_devmodel_c *dev, const char *script);
virtual ~bx_socket_pktmover_c();
void sendpkt(void *buf, unsigned io_len);
private:
unsigned char *socket_macaddr[6];
SOCKET fd; // socket we listen on
struct sockaddr_in sin, sout; // target address for RX / TX
static void rx_timer_handler(void *);
void rx_timer(void);
int rx_timer_index;
};
//
// Define the static class that registers the derived pktmover class,
// and allocates one on request.
//
class bx_socket_locator_c : public eth_locator_c {
public:
bx_socket_locator_c(void) : eth_locator_c("socket") {}
protected:
eth_pktmover_c *allocate(const char *netif, const char *macaddr,
eth_rx_handler_t rxh, eth_rx_status_t rxstat,
bx_devmodel_c *dev, const char *script) {
return (new bx_socket_pktmover_c(netif, macaddr, rxh, rxstat, dev, script));
}
} bx_socket_match;
//
// Define the methods for the bx_socket_pktmover derived class
//
// the constructor
//
bx_socket_pktmover_c::bx_socket_pktmover_c(const char *netif,
const char *macaddr,
eth_rx_handler_t rxh,
eth_rx_status_t rxstat,
bx_devmodel_c *dev,
const char *script)
{
struct hostent *hp;
int port;
#ifdef WIN32
unsigned long nbl = 1;
#endif
this->netdev = dev;
BX_INFO(("socket network driver"));
memcpy(socket_macaddr, macaddr, 6);
this->fd = INVALID_SOCKET;
#ifdef WIN32
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 0);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
BX_PANIC(("WSAStartup failed"));
return;
}
#endif
if (isalpha(netif[0])) {
// Expecting format 'host:port', so split up 'netif' string.
char *host = strdup(netif);
char *substr = strtok(host, ":");
substr = strtok(NULL, ":");
if (!substr) {
BX_PANIC(("eth_socket: inet address is wrong (%s)", netif));
free(host);
return;
}
hp = gethostbyname(host);
if (!hp) {
BX_PANIC(("eth_socket: gethostbyname failed (%s)", host));
free(host);
return;
}
free(host);
port = atoi(substr);
if (port == 0) {
BX_PANIC(("eth_socket: could not translate socket number '%s'", substr));
return;
}
} else {
// Use localhost and translate 'netif' to port number.
hp = gethostbyname("localhost");
port = atoi(netif);
if (port == 0) {
BX_PANIC(("eth_socket: could not translate socket number '%s'", netif));
return;
}
}
// Open RX socket
//
if ((this->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) {
#ifndef WIN32
this->fd = INVALID_SOCKET;
if (errno == EACCES)
BX_PANIC(("eth_socket: insufficient privileges to open socket"));
else
BX_PANIC(("eth_socket: could not open socket: %s", strerror(errno)));
#else
BX_PANIC(("eth_socket: could not open socket: error=%d", WSAGetLastError()));
#endif
return;
}
// Bind to given interface
//
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
BX_PANIC(("eth_socket: could not bind to socket '%s' (%s)", netif, strerror(errno)));
closesocket(fd);
this->fd = INVALID_SOCKET;
return;
}
// Set up non-blocking i/o
//
#ifdef WIN32
if (ioctlsocket(this->fd, FIONBIO, &nbl) != 0) {
#else
if (fcntl(this->fd, F_SETFL, O_NONBLOCK) == -1) {
#endif
BX_PANIC(("eth_socket: could not set non-blocking i/o on socket"));
closesocket(this->fd);
this->fd = INVALID_SOCKET;
return;
}
// Set up destination address for TX ( sendto() )
//
sout.sin_family = AF_INET;
sout.sin_port = htons(port+1); // set TX to RX + 1
memcpy((char*) &(sout.sin_addr), hp->h_addr, hp->h_length);
// Start the rx poll
//
this->rx_timer_index =
DEV_register_timer(this, this->rx_timer_handler, BX_PACKET_POLL, 1, 1,
"eth_socket"); // continuous, active
this->rxh = rxh;
this->rxstat = rxstat;
BX_INFO(("socket network driver initialized: using socket '%s'", netif));
}
// the destructor
//
bx_socket_pktmover_c::~bx_socket_pktmover_c()
{
#ifdef WIN32
WSACleanup();
#endif
}
// the output routine - called with pre-formatted ethernet frame.
void bx_socket_pktmover_c::sendpkt(void *buf, unsigned io_len)
{
int status;
if (this->fd != INVALID_SOCKET) {
status = sendto(this->fd, (char*)buf, io_len,
(MSG_NOSIGNAL | MSG_DONTWAIT),
(struct sockaddr*) &sout, sizeof(sout));
if (status == -1) {
BX_INFO(("eth_socket: write failed: %s", strerror(errno)));
}
}
}
// The receive poll process
//
void bx_socket_pktmover_c::rx_timer_handler(void *this_ptr)
{
bx_socket_pktmover_c *class_ptr = (bx_socket_pktmover_c *) this_ptr;
class_ptr->rx_timer();
}
void bx_socket_pktmover_c::rx_timer(void)
{
int nbytes = 0;
socklen_t slen = sizeof(sin);
Bit8u rxbuf[BX_PACKET_BUFSIZE];
// is socket open and bound?
if (this->fd == INVALID_SOCKET)
return;
// receive packet
nbytes = recvfrom(this->fd, (char*)rxbuf, sizeof(rxbuf), MSG_NOSIGNAL,
(struct sockaddr*) &sin, &slen);
if (nbytes == -1) {
if (errno != EAGAIN)
BX_INFO(("eth_socket: error receiving packet: %s\n", strerror(errno)));
return;
}
// let through broadcast and our mac address
if ((memcmp(rxbuf, this->socket_macaddr, 6) != 0) &&
(memcmp(rxbuf, broadcast_macaddr, 6) != 0)) {
return;
}
if (this->rxstat(this->netdev) & BX_NETDEV_RXREADY) {
BX_DEBUG(("eth_socket: got packet: %d bytes, dst=%x:%x:%x:%x:%x:%x, src=%x:%x:%x:%x:%x:%x\n", nbytes, rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4], rxbuf[5], rxbuf[6], rxbuf[7], rxbuf[8], rxbuf[9], rxbuf[10], rxbuf[11]));
this->rxh(this->netdev, rxbuf, nbytes);
}
}
#endif /* if BX_NETWORKING && BX_NETMOD_SOCKET */
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