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Internet Info 1994 March
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Internet Info CD-ROM (Walnut Creek) (March 1994).iso
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networking
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appletalk
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uab.shar
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snitp.c
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C/C++ Source or Header
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1990-07-12
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408 lines
static char rcsid[] = "$Author: cck $ $Date: 88/09/14 10:20:35 $";
static char rcsident[] = "$Header: /src/local/mac/cap/etalk/RCS/snitp.c,v 1.9 88/09/14 10:20:35 cck Rel $";
static char revision[] = "$Revision: 1.9 $";
/*
* snitp.c - Simple "protocol" level interface to Streams based NIT
* (SunOS 4.0)
*
* Provides ability to read/write packets at ethernet level
*
*
* Copyright (c) 1988 by The Trustees of Columbia University
* in the City of New York.
*
* Permission is granted to any individual or institution to use,
* copy, or redistribute this software so long as it is not sold for
* profit, provided that this notice and the original copyright
* notices are retained. Columbia University nor the author make no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* Edit History:
*
* July 1988 CCKim Created
*
*/
static char columbia_copyright[] = "Copyright (c) 1988 by The Trustees of \
Columbia University in the City of New York";
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/nit.h>
#include <net/nit_if.h>
#include <net/nit_pf.h>
#include <net/nit_buf.h>
#include <net/packetfilt.h>
#include <stropts.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netdb.h>
#include <ctype.h>
#include <netat/appletalk.h>
#include "proto_intf.h"
typedef struct ephandle { /* ethernet protocol driver handle */
int inuse; /* true if inuse */
int socket; /* file descriptor of socket */
struct ifreq ifr;
int protocol; /* ethernet protocol */
} EPHANDLE;
private inited = FALSE;
private EPHANDLE ephlist[MAXOPENPROT];
/*
* setup for particular device devno
* all pi_open's will go this device
*/
export
pi_setup()
{
int i;
if (!inited) {
for (i = 0 ; i < MAXOPENPROT; i++)
ephlist[i].inuse = FALSE;
(void)init_fdlistening();
inited = TRUE; /* don't forget now */
}
return(TRUE);
}
/*
* Open up a protocol handle:
* user level data:
* file descriptor
* protocol
*
* returns -1 and ephandle == NULL if memory allocation problems
* returns -1 for other errors
* return edx > 0 for okay
*/
export int
pi_open(protocol, dev, devno)
int protocol;
char *dev;
int devno;
{
struct ephandle *eph;
char devnamebuf[100]; /* room for device name */
int s;
int i;
for (i = 0; i < MAXOPENPROT; i++) {
if (!ephlist[i].inuse)
break;
}
if (i == MAXOPENPROT)
return(0); /* nothing */
eph = &ephlist[i]; /* find handle */
sprintf(devnamebuf, "%s%d",dev,devno);
strncpy(eph->ifr.ifr_name, devnamebuf, sizeof eph->ifr.ifr_name);
eph->ifr.ifr_name[sizeof eph->ifr.ifr_name - 1] = ' ';
if ((s = init_nit(1024, protocol, &eph->ifr)) < 0) {
return(-1);
}
eph->inuse = TRUE;
eph->socket = s;
eph->protocol = protocol;
return(i+1); /* skip zero */
}
/* returns TRUE if machine will see own broadcasts */
export int
pi_delivers_self_broadcasts()
{
return(FALSE);
}
export int
pi_close(edx)
int edx;
{
if (edx < 1 || edx > MAXOPENPROT || !ephlist[edx-1].inuse)
return(-1);
fdunlisten(ephlist[edx-1].socket); /* toss listener */
close(ephlist[edx-1].socket);
ephlist[edx-1].inuse = 0;
return(0);
}
/*
* Initialize nit on a particular protocol type
*
* Runs in promiscous mode for now.
*
* Return: socket if no error, < 0 o.w.
*/
private int
init_nit(chunksize, protocol, ifr)
u_long chunksize;
u_short protocol;
struct ifreq *ifr;
{
u_long if_flags;
struct strioctl si;
int s;
/* get clone */
if ((s = open("/dev/nit", O_RDWR)) < 0) {
perror("open: /dev/nit");
return(-1);
}
/* set up messages */
if (ioctl(s, I_SRDOPT, (char *)RMSGD) < 0) { /* want messages */
perror("ioctl: discretem");
return(-1);
}
si.ic_timout = INFTIM;
if (setup_pf(s, protocol) < 0)
return(-1);
#define NOBUF
#ifndef NOBUF
setup_buf(s, chunksize);
#endif
/* bind */
si.ic_cmd = NIOCBIND; /* bind */
si.ic_timout = 10;
si.ic_len = sizeof(*ifr);
si.ic_dp = (caddr_t)ifr;
if (ioctl(s, I_STR, (caddr_t)&si) < 0) {
perror(ifr->ifr_name);
return(-1);
}
/* flush read queue */
ioctl(s, I_FLUSH, (char *)FLUSHR);
return(s);
}
#ifndef NOBUF
/*
* setup buffering (not wanted)
*
*/
setup_buf(s, chunksize)
int s;
u_long chunksize;
{
struct strioctl si;
struct timeval timeout;
/* Push and configure the buffering module. */
if (ioctl(s, I_PUSH, "nbuf") < 0) {
perror("ioctl: nbuf");
}
timeout.tv_sec = 0;
timeout.tv_usec = 200;
si.ic_cmd = NIOCSTIME;
si.ic_timout = 10;
si.ic_len = sizeof timeout;
si.ic_dp = (char *)&timeout;
if (ioctl(s, I_STR, (char *)&si) < 0) {
perror("ioctl: timeout");
return(-1);
}
si.ic_cmd = NIOCSCHUNK;
si.ic_len = sizeof chunksize;
si.ic_dp = (char *)&chunksize;
if (ioctl(s, I_STR, (char *)&si)) {
perror("ioctl: chunk size");
return(-1);
}
}
#endif
/*
* establish protocol filter
*
*/
private int
setup_pf(s, prot)
int s;
u_short prot;
{
u_short offset;
struct ether_header eh;
struct packetfilt pf;
register u_short *fwp = pf.Pf_Filter;
struct strioctl si;
#define s_offset(structp, element) (&(((structp)0)->element))
offset = ((int)s_offset(struct ether_header *, ether_type))/sizeof(u_short);
*fwp++ = ENF_PUSHWORD + offset;
*fwp++ = ENF_PUSHLIT | ENF_EQ;
*fwp++ = htons(prot);
pf.Pf_FilterLen = 3;
si.ic_cmd = NIOCSETF;
si.ic_timout = 10;
si.ic_len = sizeof(pf);
si.ic_dp = (char *)&pf;
if (ioctl(s, I_PUSH, "pf") < 0) {
perror("ioctl: push protocol filter");
return(-1);
}
if (ioctl(s, I_STR, (char *)&si) < 0) {
perror("ioctl: protocol filter");
return(-1);
}
return(0);
}
export int
pi_get_ethernet_address(edx,ea)
int edx;
u_char *ea;
{
struct sockaddr *sa;
struct ephandle *eph;
if (edx < 1 || edx > MAXOPENPROT || !ephlist[edx-1].inuse)
return(-1);
eph = &ephlist[edx-1];
if (ioctl(eph->socket, SIOCGIFADDR, &eph->ifr) < 0) {
perror("ioctl: SIOCGIFADDR");
return(-1);
}
sa = (struct sockaddr *)eph->ifr.ifr_data;
bcopy(sa->sa_data, ea, 6);
return(0);
}
export
pi_listener(edx, listener, arg)
int edx;
int (*listener)();
caddr_t arg;
{
if (edx < 1 || edx > MAXOPENPROT || !ephlist[edx-1].inuse)
return(-1);
fdlistener(ephlist[edx-1].socket, listener, arg, edx);
}
/*
* cheat - iov[0] == struct etherheader
*
*/
export int
pi_readv(edx, iov, iovlen)
int edx;
struct iovec *iov;
int iovlen;
{
struct ephandle *eph ;
int cc;
if (edx < 1 || edx > MAXOPENPROT)
return(-1);
eph = &ephlist[edx-1];
if (!eph->inuse)
return(-1);
if ((cc = readv(eph->socket, iov, iovlen)) < 0) {
perror("abread");
return(cc);
}
return(cc);
}
export int
pi_read(edx, buf, bufsiz)
int edx;
caddr_t buf;
int bufsiz;
{
struct iovec iov[2];
struct ethernet_addresses ea;
int cc;
iov[0].iov_base = (caddr_t)&ea;
iov[0].iov_len = sizeof(ea);
iov[1].iov_base = (caddr_t)buf;
iov[1].iov_len = bufsiz;
cc = pi_readv(edx, iov, 2);
return(cc - sizeof(ea));
}
export int
pi_write(edx, buf, buflen, eaddr)
int edx;
caddr_t buf;
int buflen;
char *eaddr;
{
struct ephandle *eph;
struct ether_header *eh;
struct strbuf pbuf, dbuf;
struct sockaddr sa;
if (edx < 1 || edx > MAXOPENPROT || eaddr == NULL)
return(-1);
eph = &ephlist[edx-1];
if (!eph->inuse)
return(-1);
sa.sa_family = AF_UNSPEC; /* by def. */
eh = (struct ether_header *)sa.sa_data; /* make pointer */
bcopy(eaddr, &eh->ether_dhost, sizeof(eh->ether_dhost));
eh->ether_type = eph->protocol;
pbuf.len = sizeof(sa);
pbuf.buf = (char *)&sa;
dbuf.len = buflen;
dbuf.buf = (caddr_t)buf;
if (putmsg(eph->socket, &pbuf, &dbuf, 0) < 0) {
return(-1);
}
return(buflen);
}
private char ebuf[2000]; /* big enough */
export int
pi_writev(edx, iov, iovlen, eaddr)
int edx;
struct iovec *iov;
int iovlen;
unsigned char eaddr[6];
{
int i;
char *p;
int len;
if (edx < 1 || edx > MAXOPENPROT || eaddr == NULL)
return(-1);
if (!ephlist[edx-1].inuse)
return(-1);
for (len = 0, p = ebuf, i = 0 ; i < iovlen ; i++)
if (iov[i].iov_base && iov[i].iov_len >= 0) {
bcopy(iov[i].iov_base, p, iov[i].iov_len);
p += iov[i].iov_len; /* advance */
len += iov[i].iov_len; /* advance */
}
return(pi_write(edx, ebuf, len, eaddr));
}