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/*
* macsock.c
*
* Macintosh socket implementation using MacTCP.
*
* This only implements what's needed for Cygnus Kerberos -- a warped
* subset of UDP.
*
* Written by John Gilmore, Cygnus Support, June 1994.
* Adapted from:
Interface into the UDP class.
Written by Timothy Miller for Brown University.
*/
/* C includes */
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* Mac includes */
#include <Memory.h>
#include <Devices.h>
#include <errno.h> /* For ENOMEM */
#ifndef ENOMEM /* Think C <errno.h> doesn't have ENOMEM */
#define ENOMEM ENOSPC
#endif
/* Our own include file */
#include "macsock.h"
/* Kerberos:source:lib:kerb - MacTCP headers from KClient */
#include "MacTCPCommonTypes.h"
#include "UDPPB.h"
#include "AddressXlation.h" /* MacTCP Domain name resolver decls */
/* This WinSock-ism is just too ugly to use everywhere. */
#define SOCKET_SET_ERRNO WSASetLastError
/* Description of our WinSock implementation... */
struct WSAData macsock_data = {
0x0101, /* wVersion = 1.1 */
0x0101, /* wHighVersion = 1.1 */
"Mac Sockets implemented on top of MacTCP, by John Gilmore of\
Cygnus Support (email info@cygnus.com).",
"It only implements a small subset of UDP for now.",
107, /* iMaxSockets, arbitrary number */
UDPbuflen, /* iMaxUDPDg, max datagram size */
0 /* lpVendorInfo, nonexistent */
};
/* This variable implements a kludge in which select() always says that
sockets are ready for I/O, but recvfrom() actually implements the
timeout that select() had requested. This hack happens to work
for Kerberos, which is all that we care about right now. */
static struct timeval last_timeout;
/* Forward declarations of static functions */
static pascal void DNRresultproc(struct hostInfo *hinfo, char *userdata);
/* Start using sockets */
int
WSAStartup(WORD wVersionRequested, WSADATA *data)
{
if (LOBYTE (wVersionRequested) < 1 ||
(LOBYTE (wVersionRequested) == 1 && HIBYTE (wVersionRequested) < 1))
return WSAVERNOTSUPPORTED;
if (data)
*data = macsock_data;
return 0;
}
/* Finish using sockets */
int
WSACleanup()
{
return 0;
}
/* Get a particular socket */
SOCKET
socket(af, type, protocol)
int af;
int type;
int protocol;
{
SOCKET theUDP;
short refNum;
UDPiopb pb;
OSErr err;
if (af != AF_INET) {
SOCKET_SET_ERRNO (EINVAL);
return INVALID_SOCKET;
}
if (type != SOCK_DGRAM) {
SOCKET_SET_ERRNO (EINVAL);
return INVALID_SOCKET;
}
if (protocol != 0) {
SOCKET_SET_ERRNO (EINVAL);
return INVALID_SOCKET;
}
theUDP = malloc (sizeof (*theUDP));
if (theUDP == 0) {
SOCKET_SET_ERRNO (ENOMEM);
return INVALID_SOCKET;
}
err = OpenDriver( "\p.IPP", &refNum );
if (err) {
free (theUDP);
SOCKET_SET_ERRNO (EIO);
return INVALID_SOCKET;
}
theUDP->fMacTCPRef = refNum;
/* Set up param blocks and create the socket (called a
stream by MacTCP). */
pb.ioCRefNum = theUDP->fMacTCPRef;
pb.csCode = UDPCreate;
pb.csParam.create.rcvBuff = theUDP->fRecvBuf;
pb.csParam.create.rcvBuffLen = UDPbuflen;
pb.csParam.create.notifyProc = NULL;
pb.csParam.create.localPort = 0;
err = PBControl( (ParamBlockRec *) &pb, false );
if (err) {
free (theUDP);
SOCKET_SET_ERRNO (EIO);
return INVALID_SOCKET;
}
theUDP->fStream = (unsigned long)pb.udpStream;
return theUDP;
}
/* Finish using a particular socket. */
int
closesocket (theUDP)
SOCKET theUDP;
{
UDPiopb pb;
if (theUDP->fStream) {
pb.ioCRefNum = theUDP->fMacTCPRef;
pb.csCode = UDPRelease;
pb.udpStream = (StreamPtr) theUDP->fStream;
(void) PBControl( (ParamBlockRec *) &pb, false );
}
free(theUDP);
return 0;
}
/* Bind a socket to a particular address.
In our case, this is just a no-op for bug-compatability with
the FTP Software WINSOCK library. */
int
bind (s, name, namelen)
SOCKET s;
const struct sockaddr *name;
int namelen;
{
if (name->sin_family != AF_INET) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
#if 0
if (namelen != sizeof (struct sockaddr_in)) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
if (name->sin_addr.s_addr != INADDR_ANY) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
#endif
/* OK, then, it's a no-op. */
s - s; /* lint */
return 0;
}
/* Send a packet to a UDP peer. */
int
sendto (theUDP, buf, len, flags, to_param, tolen)
SOCKET theUDP;
const char *buf;
const int len;
int flags;
const struct sockaddr *to_param;
int tolen;
{
OSErr err;
/* really 1 wds + extra space for terminating null */
wdsEntry wds[2];
UDPiopb pb;
struct sockaddr_in *to = (struct sockaddr_in *)to_param;
if (tolen != sizeof (struct sockaddr_in)) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
if (to->sin_family != AF_INET) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
wds[0].length = len;
wds[0].ptr = (char *) buf;
wds[1].length = 0;
pb.ioCRefNum = theUDP->fMacTCPRef;
pb.csCode = UDPWrite;
pb.udpStream = (StreamPtr) theUDP->fStream;
pb.csParam.send.remotePort = to->sin_port;
pb.csParam.send.wdsPtr = (Ptr) wds;
pb.csParam.send.checkSum = 1; // TRUE
pb.csParam.send.sendLength = 0; // reserved
pb.csParam.send.remoteHost = to->sin_addr.s_addr;
err = PBControl( (ParamBlockRec *) &pb, false );
if (err != noErr) {
SOCKET_SET_ERRNO (EIO);
return SOCKET_ERROR;
}
return len;
}
/* Select for sockets that are ready for I/O.
This version just remembers the timeout for a future receive...
It always reports that one socket is ready for I/O.
*/
int
select (nfds, readfds, writefds, exceptfds, timeout)
int nfds;
fd_set *readfds;
fd_set *writefds;
fd_set *exceptfds;
const struct timeval *timeout;
{
if (timeout)
last_timeout = *timeout;
return 1; /* Claim that a single FD is ready */
/* Note that readfd, writefds, and exceptfds still have all
of their current values, indicating that they're all ready
for I/O. */
}
/* Receive a packet from a UDP peer. */
int
recvfrom (theUDP, buf, len, flags, from_param, fromlen)
SOCKET theUDP;
char *buf;
int len;
int flags;
struct sockaddr *from_param;
int *fromlen;
{
OSErr err;
UDPiopb pb;
int packet_len;
struct sockaddr_in *from = (struct sockaddr_in *)from_param;
if (*fromlen < sizeof (*from)) {
SOCKET_SET_ERRNO (EINVAL);
return SOCKET_ERROR;
}
pb.ioCRefNum = theUDP->fMacTCPRef;
pb.csCode = UDPRead;
pb.udpStream = (StreamPtr) theUDP->fStream;
pb.csParam.receive.timeOut = last_timeout.tv_sec;
pb.csParam.receive.secondTimeStamp = 0; // reserved
err = PBControl( (ParamBlockRec *) &pb, false );
if( err ) {
SOCKET_SET_ERRNO (EIO);
return SOCKET_ERROR;
}
packet_len = pb.csParam.receive.rcvBuffLen;
if( len > packet_len )
len = packet_len; /* only move as much as we got */
BlockMove( pb.csParam.receive.rcvBuff, buf, len );
*fromlen = sizeof (*from);
from->sin_family = AF_INET;
from->sin_port = pb.csParam.receive.remotePort;
from->sin_addr.s_addr = pb.csParam.receive.remoteHost;
if( pb.csParam.receive.rcvBuffLen ) {
pb.csCode = UDPBfrReturn;
err = PBControl( (ParamBlockRec *) &pb, false );
}
if (len < packet_len) {
/* Only got first part of packet, rest was dropped. */
SOCKET_SET_ERRNO (EMSGSIZE);
return SOCKET_ERROR;
}
return len;
}
/*
Interface UNIX routine inet_ntoa with mac equivalent.
The input argument is a struct containing the internet address.
struct type defined in config-mac.h
The routine inet_ntoa() returns a pointer to a string in the
base 256 notation ``d.d.d.d''
*/
char*
inet_ntoa(struct in_addr ina) {
OSErr err;
#define max_addr_str 16
char addrStr[max_addr_str];
err = AddrToStr(ina.s_addr, addrStr);
return addrStr;
}
/* Static variables which provide space for the last result from getXbyY. */
static struct hostInfo host;
static char * ipaddr_ptrs[NUM_ALT_ADDRS+1];
static struct hostent result;
/*
Performs a domain name resolution of host, returning an IP address for it,
or 0 if any error occurred.
FIXME -- this routine has the potential to go asynchronous, but it
loops until the asynchronous call to MacTCP finishes.
*/
struct hostent *
gethostbyname (char *hostname)
{
OSErr err;
char done = false;
int i;
if (err = OpenResolver(NULL))
return(0); // make sure resolver is open
err = StrToAddr(hostname, &host, DNRresultproc, &done);
if (err == cacheFault) {
while(!done) ; /* LOOP UNTIL CALLBACK IS RUN */
err = host.rtnCode; /* Pick up final result code */
}
if (err != noErr) {
return 0;
}
/* Build result in hostent structure, which we will return to caller. */
result.h_name = host.cname;
result.h_aliases = 0; /* We don't know about aliases. */
result.h_addrtype = AF_INET;
result.h_length = sizeof (host.addr[0]); /* Length of each address */
result.h_addr_list = ipaddr_ptrs;
for (i = 0; i < NUM_ALT_ADDRS; i++)
if (host.addr[i] != 0) /* Assume addrs terminated with 0 addr */
ipaddr_ptrs[i] = (char*) &host.addr[i]; /* Point at good IP addresses */
else
break; /* Quit when we see first zero address */
ipaddr_ptrs[i] = 0;
return &result;
}
/* Does a reverse DNS lookup of addr, to find the canonical name of its host.
FIXME, set errno for failures. */
struct hostent *
gethostbyaddr (char *addr, int len, int type)
{
OSErr err;
char done = false;
ip_addr macaddr;
if (type != AF_INET)
return 0; /* We only do Internet addresses */
if (len != sizeof (ip_addr))
return 0; /* We only handle IP addrs *this* long... */
memcpy ((void *)&macaddr, (void *)addr, (size_t)len);
if (err = OpenResolver(NULL))
return 0; // make sure resolver is open
err = AddrToName(macaddr, &host, DNRresultproc, &done);
if (err == cacheFault) {
while(!done) ; /* LOOP UNTIL CALLBACK IS RUN */
err = host.rtnCode; /* Pick up final result code */
}
if (err != noErr) {
/* Set errno? FIXME. */
return 0;
}
/* Build result in hostent structure, which we will return to caller. */
result.h_name = host.cname;
result.h_aliases = 0; /* We don't know about aliases. */
result.h_addrtype = AF_INET;
result.h_length = sizeof (host.addr[0]); /* Length of each address */
result.h_addr_list = 0; /* MacTCP doesn't give us this info on addr->name */
return &result;
}
/* Tell calling program that the asynchronous operation has finished.
FIXME, this will require significant work if we support async calls to
Kerberos in the future. */
static pascal void
DNRresultproc(struct hostInfo *hinfo, char *userdata)
{
*userdata = true;
}
#if 0
/* FIXME: THIS WAS A STAB AT GETHOSTNAME, which I abandoned for lack of need,
and since the required header files didn't seem to be handy.
-- gnu@cygnus.com june94 */
/*
* gethostname
*
* Gets our own host name, by getting our IP address and asking what name
* corresponds. There seems to be no better way in MacTCP to do this.
*/
int
gethostname(name, namelen)
char *name;
int namelen;
{
ip_addr ourAddress;
SOCKET sock;
struct IPParamBlock pb;
struct hostent *host;
struct sockaddr_in hostaddr;
sock = socket (AF_INET, SOCK_DGRAM, 0);
if (!sock)
return -1;
pb.ioCRefNum = sock->fMacTCPRef;
pb.csCode = ipctlGetAddr;
err = PBControl( (ParamBlockRec *) &pb, false );
if (err) {
free (theUDP);
SOCKET_SET_ERRNO (EIO);
return -1;
}
pb.csParam.xxxx
host = gethostbyaddr (&hostaddr, sizeof (hostaddr), AF_INET);
if (!host)
return -1;
len = strlen (host->h_name);
if (len > namelen)
return -1;
memcpy (name, host->h_name, len+1);
return 0;
}
#endif
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