path: root/sys/nfs/bootp_subr.c

/*	$Id: bootp_subr.c,v 1.12 1998/03/28 10:33:15 bde Exp $	*/

/*
 * Copyright (c) 1995 Gordon Ross, Adam Glass
 * Copyright (c) 1992 Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratory and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    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.
 *
 * based on:
 *      nfs/krpc_subr.c
 *	$NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
 */

#include "opt_bootp.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/uio.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <net/if_types.h>
#include <net/if_dl.h>

#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/krpc.h>
#include <nfs/xdr_subs.h>


#define BOOTP_MIN_LEN		300	/* Minimum size of bootp udp packet */

/*
 * What is the longest we will wait before re-sending a request?
 * Note this is also the frequency of "RPC timeout" messages.
 * The re-send loop count sup linearly to this maximum, so the
 * first complaint will happen after (1+2+3+4+5)=15 seconds.
 */
#define	MAX_RESEND_DELAY 5	/* seconds */

/* Definitions from RFC951 */
struct bootp_packet {
  u_int8_t op;
  u_int8_t htype;
  u_int8_t hlen;
  u_int8_t hops;
  u_int32_t xid;
  u_int16_t secs;
  u_int16_t flags;
  struct in_addr ciaddr;
  struct in_addr yiaddr;
  struct in_addr siaddr;
  struct in_addr giaddr;
  unsigned char chaddr[16];
  char sname[64];
  char file[128];
  unsigned char vend[256];
};

#define IPPORT_BOOTPC 68
#define IPPORT_BOOTPS 67

extern int nfs_diskless_valid;
extern struct nfsv3_diskless nfsv3_diskless;

/* mountd RPC */
static int md_mount __P((struct sockaddr_in *mdsin, char *path,
	u_char *fhp, int *fhsizep, struct nfs_args *args,struct proc *procp));
static int md_lookup_swap __P((struct sockaddr_in *mdsin,char *path,
			       u_char *fhp, int *fhsizep, 
			       struct nfs_args *args,
			       struct proc *procp));
static int setfs __P((struct sockaddr_in *addr, char *path, char *p));
static int getdec __P((char **ptr));
static char *substr __P((char *a,char *b));
static void mountopts __P((struct nfs_args *args, char *p)); 
static int xdr_opaque_decode __P((struct mbuf **ptr,u_char *buf,
				  int len));
static int xdr_int_decode __P((struct mbuf **ptr,int *iptr));
static void printip __P((char *prefix,struct in_addr addr));

#ifdef BOOTP_DEBUG
void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
void bootpboot_p_ma(struct sockaddr *ma);
void bootpboot_p_rtentry(struct rtentry *rt);
void bootpboot_p_tree(struct radix_node *rn);
void bootpboot_p_rtlist(void);
void bootpboot_p_iflist(void);
#endif

static int  bootpc_call(struct bootp_packet *call,
			struct bootp_packet *reply,
			struct proc *procp);

static int bootpc_fakeup_interface(struct ifreq *ireq,
			struct socket *so,
			struct proc *procp);

static int 
bootpc_adjust_interface(struct ifreq *ireq,struct socket *so,
			struct sockaddr_in *myaddr,
			struct sockaddr_in *netmask,
			struct sockaddr_in *gw,
			struct proc *procp);

void bootpc_init(void);

#ifdef BOOTP_DEBUG
void bootpboot_p_sa(sa,ma)
     struct sockaddr *sa;
     struct sockaddr *ma;
{
  if (!sa) {
    printf("(sockaddr *) <null>");
    return;
  }
  switch (sa->sa_family) {
  case AF_INET:
    {
      struct sockaddr_in *sin = (struct sockaddr_in *) sa;
      printf("inet %x",ntohl(sin->sin_addr.s_addr));
      if (ma) {
	struct sockaddr_in *sin = (struct sockaddr_in *) ma;
	printf(" mask %x",ntohl(sin->sin_addr.s_addr));
      }
    }
  break;
  case AF_LINK:
    {
      struct sockaddr_dl *sli = (struct sockaddr_dl *) sa;
      int i;
      printf("link %.*s ",sli->sdl_nlen,sli->sdl_data);
      for (i=0;i<sli->sdl_alen;i++) {
	if (i>0)
	  printf(":");
	printf("%x",(unsigned char) sli->sdl_data[i+sli->sdl_nlen]);
      }
    }
  break;
  default:
    printf("af%d",sa->sa_family);
  }
}

void bootpboot_p_ma(ma)
     struct sockaddr *ma;
{
  if (!ma) {
    printf("<null>");
    return;
  }
  printf("%x",*(int*)ma);
}

void bootpboot_p_rtentry(rt)
     struct rtentry *rt;
{
  bootpboot_p_sa(rt_key(rt),rt_mask(rt));
  printf(" ");
  bootpboot_p_ma(rt->rt_genmask);
  printf(" ");
  bootpboot_p_sa(rt->rt_gateway,NULL);
  printf(" ");
  printf("flags %x",(unsigned short) rt->rt_flags);
  printf(" %d",rt->rt_rmx.rmx_expire);
  printf(" %s%d\n",rt->rt_ifp->if_name,rt->rt_ifp->if_unit);
}
void  bootpboot_p_tree(rn)
     struct radix_node *rn;
{
  while (rn) {
    if (rn->rn_b < 0) {
      if (rn->rn_flags & RNF_ROOT) {
      } else {
	bootpboot_p_rtentry((struct rtentry *) rn);
      }
      rn = rn->rn_dupedkey;
    } else {
      bootpboot_p_tree(rn->rn_l);
      bootpboot_p_tree(rn->rn_r);
      return;
    }
    
  }
}

void bootpboot_p_rtlist(void)
{
  printf("Routing table:\n");
  bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
}

void bootpboot_p_iflist(void)
{
  struct ifnet *ifp;
  struct ifaddr *ifa;
  printf("Interface list:\n");
  for (ifp = TAILQ_FIRST(&ifnet); ifp != 0; ifp = TAILQ_NEXT(ifp,if_link))
    {
      for (ifa = TAILQ_FIRST(&ifp->if_addrhead) ;ifa; 
	   ifa=TAILQ_NEXT(ifa,ifa_link))
	if (ifa->ifa_addr->sa_family == AF_INET ) {
	  printf("%s%d flags %x, addr %x, bcast %x, net %x\n",
		 ifp->if_name,ifp->if_unit,
		 (unsigned short) ifp->if_flags,
		 ntohl(((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr),
		 ntohl(((struct sockaddr_in *) ifa->ifa_dstaddr)->sin_addr.s_addr),
		 ntohl(((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr.s_addr)
		 );
	}
    }
}
#endif

static int
bootpc_call(call,reply,procp)
     struct bootp_packet *call;
     struct bootp_packet *reply;	/* output */
     struct proc *procp;
{
	struct socket *so;
	struct sockaddr_in *sin, sa;
	struct mbuf *m;
	struct uio auio;
	struct iovec aio;
	int error, rcvflg, timo, secs, len;
	u_int tport;

	/*
	 * Create socket and set its recieve timeout.
	 */
	if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0,procp)))
		goto out;

	m = m_get(M_WAIT, MT_SOOPTS);
	if (m == NULL) {
		error = ENOBUFS;
		goto out;
	} else {
		struct timeval *tv;
		tv = mtod(m, struct timeval *);
		m->m_len = sizeof(*tv);
		tv->tv_sec = 1;
		tv->tv_usec = 0;
		if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m, procp)))
			goto out;
	}

	/*
	 * Enable broadcast.
	 */
	{
		int *on;
		m = m_get(M_WAIT, MT_SOOPTS);
		if (m == NULL) {
			error = ENOBUFS;
			goto out;
		}
		on = mtod(m, int *);
		m->m_len = sizeof(*on);
		*on = 1;
		if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m, procp)))
			goto out;
	}

	/*
	 * Bind the local endpoint to a bootp client port.
	 */
	sin = &sa;
	bzero(sin, sizeof *sin);
	sin->sin_len = sizeof(*sin);
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = INADDR_ANY;
	sin->sin_port = htons(IPPORT_BOOTPC);
	error = sobind(so, (struct sockaddr *)sin, procp);
	if (error) {
		printf("bind failed\n");
		goto out;
	}

	/*
	 * Setup socket address for the server.
	 */
	sin = &sa;
	bzero(sin, sizeof *sin);
	sin->sin_len = sizeof(*sin);
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = INADDR_BROADCAST;
	sin->sin_port = htons(IPPORT_BOOTPS);

	/*
	 * Send it, repeatedly, until a reply is received,
	 * but delay each re-send by an increasing amount.
	 * If the delay hits the maximum, start complaining.
	 */
	timo = 0;
	for (;;) {
		/* Send BOOTP request (or re-send). */
		
		aio.iov_base = (caddr_t) call;
		aio.iov_len = sizeof(*call);
		
		auio.uio_iov = &aio;
		auio.uio_iovcnt = 1;
		auio.uio_segflg = UIO_SYSSPACE;
		auio.uio_rw = UIO_WRITE;
		auio.uio_offset = 0;
		auio.uio_resid = sizeof(*call);
		auio.uio_procp = procp;

		error = sosend(so, (struct sockaddr *)sin, &auio, NULL, 
			       NULL, 0, procp);
		if (error) {
			printf("bootpc_call: sosend: %d\n", error);
			goto out;
		}

		/* Determine new timeout. */
		if (timo < MAX_RESEND_DELAY)
			timo++;
		else
			printf("BOOTP timeout for server 0x%x\n",
			       ntohl(sin->sin_addr.s_addr));

		/*
		 * Wait for up to timo seconds for a reply.
		 * The socket receive timeout was set to 1 second.
		 */
		secs = timo;
		while (secs > 0) {
			aio.iov_base = (caddr_t) reply;
			aio.iov_len = sizeof(*reply);

			auio.uio_iov = &aio;
			auio.uio_iovcnt = 1;
			auio.uio_segflg = UIO_SYSSPACE;
			auio.uio_rw = UIO_READ;
			auio.uio_offset = 0;
			auio.uio_resid = sizeof(*reply);
			auio.uio_procp = procp;
			
			rcvflg = 0;
			error = soreceive(so, NULL, &auio, NULL, NULL, &rcvflg);
			if (error == EWOULDBLOCK) {
				secs--;
				call->secs=htons(ntohs(call->secs)+1);
				continue;
			}
			if (error)
				goto out;
			len = sizeof(*reply) - auio.uio_resid;

			/* Do we have the required number of bytes ? */
			if (len < BOOTP_MIN_LEN)
				continue;

			/* Is it the right reply? */
			if (reply->op != 2)
			  continue;

			if (reply->xid != call->xid)
				continue;

			if (reply->hlen != call->hlen)
			  continue;

			if (bcmp(reply->chaddr,call->chaddr,call->hlen))
			  continue;

			goto gotreply;	/* break two levels */

		} /* while secs */
	} /* forever send/receive */

	error = ETIMEDOUT;
	goto out;

 gotreply:
 out:
	soclose(so);
	return error;
}

static int 
bootpc_fakeup_interface(struct ifreq *ireq,struct socket *so,
			struct proc *procp)
{
  struct sockaddr_in *sin;
  int error;
  struct sockaddr_in dst;
  struct sockaddr_in gw;
  struct sockaddr_in mask;

  /*
   * Bring up the interface.
   *
   * Get the old interface flags and or IFF_UP into them; if
   * IFF_UP set blindly, interface selection can be clobbered.
   */
  error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
  ireq->ifr_flags |= IFF_UP;
  error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);

  /*
   * Do enough of ifconfig(8) so that the chosen interface
   * can talk to the servers.  (just set the address)
   */
  
  /* addr is 0.0.0.0 */
  
  sin = (struct sockaddr_in *)&ireq->ifr_addr;
  bzero((caddr_t)sin, sizeof(*sin));
  sin->sin_len = sizeof(*sin);
  sin->sin_family = AF_INET;
  sin->sin_addr.s_addr = INADDR_ANY;
  error = ifioctl(so, SIOCSIFADDR, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_fakeup_interface: set if addr, error=%d", error);
  
  /* netmask is 0.0.0.0 */
  
  sin = (struct sockaddr_in *)&ireq->ifr_addr;
  bzero((caddr_t)sin, sizeof(*sin));
  sin->sin_len = sizeof(*sin);
  sin->sin_family = AF_INET;
  sin->sin_addr.s_addr = INADDR_ANY;
  error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_fakeup_interface: set if net addr, error=%d", error);
  
  /* Broadcast is 255.255.255.255 */
  
  sin = (struct sockaddr_in *)&ireq->ifr_addr;
  bzero((caddr_t)sin, sizeof(*sin));
  sin->sin_len = sizeof(*sin);
  sin->sin_family = AF_INET;
  sin->sin_addr.s_addr = INADDR_BROADCAST;
  error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_fakeup_interface: set if broadcast addr, error=%d", error);
  
  /* Add default route to 0.0.0.0 so we can send data */
  
  bzero((caddr_t) &dst, sizeof(dst));
  dst.sin_len=sizeof(dst);
  dst.sin_family=AF_INET;
  dst.sin_addr.s_addr = htonl(0);
  
  bzero((caddr_t) &gw, sizeof(gw));
  gw.sin_len=sizeof(gw);
  gw.sin_family=AF_INET;
  gw.sin_addr.s_addr = htonl(0x0);
  
  bzero((caddr_t) &mask, sizeof(mask));
  mask.sin_len=sizeof(mask);
  mask.sin_family=AF_INET;
  mask.sin_addr.s_addr = htonl(0);
  
  error = rtrequest(RTM_ADD, 
		    (struct sockaddr *) &dst, 
		    (struct sockaddr *) &gw,
		    (struct sockaddr *) &mask, 
		    RTF_UP | RTF_STATIC
		    , NULL);
  if (error)
    printf("bootpc_fakeup_interface: add default route, error=%d\n", error);
  return error;
}

static int 
bootpc_adjust_interface(struct ifreq *ireq,struct socket *so,
			struct sockaddr_in *myaddr,
			struct sockaddr_in *netmask,
			struct sockaddr_in *gw,
			struct proc *procp)
{
  int error;
  struct sockaddr_in oldgw;
  struct sockaddr_in olddst;
  struct sockaddr_in oldmask;
  struct sockaddr_in *sin;

  /* Remove old default route to 0.0.0.0 */
  
  bzero((caddr_t) &olddst, sizeof(olddst));
  olddst.sin_len=sizeof(olddst);
  olddst.sin_family=AF_INET;
  olddst.sin_addr.s_addr = INADDR_ANY;
  
  bzero((caddr_t) &oldgw, sizeof(oldgw));
  oldgw.sin_len=sizeof(oldgw);
  oldgw.sin_family=AF_INET;
  oldgw.sin_addr.s_addr = INADDR_ANY;
  
  bzero((caddr_t) &oldmask, sizeof(oldmask));
  oldmask.sin_len=sizeof(oldmask);
  oldmask.sin_family=AF_INET;
  oldmask.sin_addr.s_addr = INADDR_ANY;
  
  error = rtrequest(RTM_DELETE, 
		    (struct sockaddr *) &olddst,
		    (struct sockaddr *) &oldgw,
		    (struct sockaddr *) &oldmask, 
		    (RTF_UP | RTF_STATIC), NULL);
  if (error) {
    printf("nfs_boot: del default route, error=%d\n", error);
    return error;
  }

  /*
   * Do enough of ifconfig(8) so that the chosen interface
   * can talk to the servers.  (just set the address)
   */
  bcopy(netmask,&ireq->ifr_addr,sizeof(*netmask));
  error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, procp);
  if (error)
    panic("nfs_boot: set if netmask, error=%d", error);

  /* Broadcast is with host part of IP address all 1's */
  
  sin = (struct sockaddr_in *)&ireq->ifr_addr;
  bzero((caddr_t)sin, sizeof(*sin));
  sin->sin_len = sizeof(*sin);
  sin->sin_family = AF_INET;
  sin->sin_addr.s_addr = myaddr->sin_addr.s_addr | ~ netmask->sin_addr.s_addr;
  error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, procp);
  if (error)
    panic("bootpc_call: set if broadcast addr, error=%d", error);
  
  bcopy(myaddr,&ireq->ifr_addr,sizeof(*myaddr));
  error = ifioctl(so, SIOCSIFADDR, (caddr_t)ireq, procp);
  if (error)
    panic("nfs_boot: set if addr, error=%d", error);

  /* Add new default route */

  error = rtrequest(RTM_ADD, 
		    (struct sockaddr *) &olddst,
		    (struct sockaddr *) gw,
		    (struct sockaddr *) &oldmask,
		    (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
  if (error) {
    printf("nfs_boot: add net route, error=%d\n", error);
    return error;
  }

  return 0;
}

static int setfs(addr, path, p)
	struct sockaddr_in *addr;
	char *path;
	char *p;
{
	unsigned ip = 0;
	int val;

	if (((val = getdec(&p)) < 0) || (val > 255)) return(0);
	ip = val << 24;
	if (*p != '.') return(0);
	p++;
	if (((val = getdec(&p)) < 0) || (val > 255)) return(0);
	ip |= (val << 16);
	if (*p != '.') return(0);
	p++;
	if (((val = getdec(&p)) < 0) || (val > 255)) return(0);
	ip |= (val << 8);
	if (*p != '.') return(0);
	p++;
	if (((val = getdec(&p)) < 0) || (val > 255)) return(0);
	ip |= val;
	if (*p != ':') return(0);
	p++;

	addr->sin_addr.s_addr = htonl(ip);
	addr->sin_len = sizeof(struct sockaddr_in);
	addr->sin_family = AF_INET;

	strncpy(path,p,MNAMELEN-1);
	return(1);
}

static int getdec(ptr)
	char **ptr;
{
	char *p = *ptr;
	int ret=0;
	if ((*p < '0') || (*p > '9')) return(-1);
	while ((*p >= '0') && (*p <= '9')) {
		ret = ret*10 + (*p - '0');
		p++;
	}
	*ptr = p;
	return(ret);
}

static char *substr(a,b)
	char *a,*b;
{
	char *loc1;
	char *loc2;

        while (*a != '\0') {
                loc1 = a;
                loc2 = b;
                while (*loc1 == *loc2++) {
                        if (*loc1 == '\0') return (0);
                        loc1++;
                        if (*loc2 == '\0') return (loc1);
                }
        a++;
        }
        return (0);
}

static void mountopts(args,p)
	struct nfs_args *args;
	char *p;
{
	char *tmp;
  
	args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
	args->sotype = SOCK_DGRAM;
	if ((tmp = (char *)substr(p,"rsize=")))
		args->rsize=getdec(&tmp);
	if ((tmp = (char *)substr(p,"wsize=")))
		args->wsize=getdec(&tmp);
	if ((tmp = (char *)substr(p,"intr")))
		args->flags |= NFSMNT_INT;
	if ((tmp = (char *)substr(p,"soft")))
		args->flags |= NFSMNT_SOFT;
	if ((tmp = (char *)substr(p,"noconn")))
		args->flags |= NFSMNT_NOCONN;
	if ((tmp = (char *)substr(p, "tcp")))
	    args->sotype = SOCK_STREAM;
}

static int xdr_opaque_decode(mptr,buf,len)
     struct mbuf **mptr;
     u_char *buf;
     int len;	
{
  struct mbuf *m;
  int alignedlen;

  m = *mptr;
  alignedlen = ( len + 3 ) & ~3;

  if (m->m_len < alignedlen) {
    m = m_pullup(m,alignedlen);
    if (m == NULL) {
      *mptr = NULL;
      return EBADRPC;
    }
  }
  bcopy(mtod(m,u_char *),buf,len);
  m_adj(m,alignedlen);
  *mptr = m;
  return 0;
}

static int xdr_int_decode(mptr,iptr)
     struct mbuf **mptr;
     int *iptr;
{
  u_int32_t i;
  if (xdr_opaque_decode(mptr,(u_char *) &i,sizeof(u_int32_t)))
    return EBADRPC;
  *iptr = fxdr_unsigned(u_int32_t,i);
  return 0;
}

static void printip(char *prefix,struct in_addr addr)
{
  unsigned int ip;

  ip = ntohl(addr.s_addr);

  printf("%s is %d.%d.%d.%d\n",prefix,
	 ip >> 24, (ip >> 16) & 255 ,(ip >> 8) & 255 ,ip & 255 );
}

void
bootpc_init(void)
{
  struct bootp_packet call;
  struct bootp_packet reply;
  static u_int32_t xid = ~0xFF;
  
  struct ifreq ireq;
  struct ifnet *ifp;
  struct socket *so;
  int error;
  int code,ncode,len;
  int i,j;
  char *p;
  unsigned int ip;

  struct sockaddr_in myaddr;
  struct sockaddr_in netmask;
  struct sockaddr_in gw;
  int gotgw=0;
  int gotnetmask=0;
  int gotrootpath=0;
  int gotswappath=0;
  char lookup_path[24];

#define EALEN 6
  unsigned char ea[EALEN];
  struct ifaddr *ifa;
  struct sockaddr_dl *sdl = NULL;
  char *delim;

  struct nfsv3_diskless *nd = &nfsv3_diskless;
  struct proc *procp = curproc;

  /*
   * If already filled in, don't touch it here 
   */
  if (nfs_diskless_valid)
    return;

  /*
   * Wait until arp entries can be handled.
   */
  while (time_second == 0)
	tsleep(&time_second, PZERO+8, "arpkludge", 10);

  /*
   * Find a network interface.
   */
#ifdef BOOTP_WIRED_TO
  printf("bootpc_init: wired to interface '%s'\n",
         __XSTRING(BOOTP_WIRED_TO)); 
#endif
  bzero(&ireq, sizeof(ireq));
  for (ifp = TAILQ_FIRST(&ifnet); ifp != 0; ifp = TAILQ_NEXT(ifp,if_link))
  {
    sprintf(ireq.ifr_name, "%s%d", ifp->if_name, ifp->if_unit);
#ifdef BOOTP_WIRED_TO
    if (strcmp(ireq.ifr_name, __XSTRING(BOOTP_WIRED_TO)) == 0)
        break;
#else
    if ((ifp->if_flags &
      (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
	break;
#endif
  }     
  if (ifp == NULL)
    panic("bootpc_init: no suitable interface");
  strcpy(nd->myif.ifra_name,ireq.ifr_name);
  printf("bootpc_init: using network interface '%s'\n",
	 ireq.ifr_name);

  if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0,procp)) != 0)
    panic("nfs_boot: socreate, error=%d", error);
	  
  bootpc_fakeup_interface(&ireq,so,procp);

  printf("Bootpc testing starting\n");
  
  /* Get HW address */

  for (ifa = TAILQ_FIRST(&ifp->if_addrhead) ;ifa; 
       ifa=TAILQ_NEXT(ifa,ifa_link))
    if (ifa->ifa_addr->sa_family == AF_LINK &&
	(sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) &&
	sdl->sdl_type == IFT_ETHER)
      break;
  
  if (!sdl)
    panic("bootpc: Unable to find HW address");
  if (sdl->sdl_alen != EALEN ) 
    panic("bootpc: HW address len is %d, expected value is %d",
	  sdl->sdl_alen,EALEN);

  printf("bootpc hw address is ");
  delim="";
  for (j=0;j<sdl->sdl_alen;j++) {
    printf("%s%x",delim,((unsigned char *)LLADDR(sdl))[j]);
    delim=":";
  }
  printf("\n");

#if 0
  bootpboot_p_iflist();
  bootpboot_p_rtlist();
#endif
  
  bzero((caddr_t) &call, sizeof(call));

  /* bootpc part */
  call.op = 1; 			/* BOOTREQUEST */
  call.htype= 1;		/* 10mb ethernet */
  call.hlen=sdl->sdl_alen;	/* Hardware address length */
  call.hops=0;	
  xid++;
  call.xid = txdr_unsigned(xid);
  bcopy(LLADDR(sdl),&call.chaddr,sdl->sdl_alen);
  
  call.vend[0]=99;
  call.vend[1]=130;
  call.vend[2]=83;
  call.vend[3]=99;
  call.vend[4]=255;
  
  call.secs = 0;
  call.flags = htons(0x8000); /* We need an broadcast answer */
  
  error = bootpc_call(&call,&reply,procp);
  
  if (error) {
#ifdef BOOTP_NFSROOT
    panic("BOOTP call failed");
#endif
    return;
  }
  
  bzero(&myaddr,sizeof(myaddr));
  bzero(&netmask,sizeof(netmask));
  bzero(&gw,sizeof(gw));

  myaddr.sin_len = sizeof(myaddr);
  myaddr.sin_family = AF_INET;

  netmask.sin_len = sizeof(netmask);
  netmask.sin_family = AF_INET;

  gw.sin_len = sizeof(gw);
  gw.sin_family= AF_INET;

  nd->root_args.version = NFS_ARGSVERSION;
  nd->root_args.rsize = 8192;
  nd->root_args.wsize = 8192;
  nd->root_args.sotype = SOCK_DGRAM;
  nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);

  nd->swap_saddr.sin_len = sizeof(gw);
  nd->swap_saddr.sin_family = AF_INET;

  nd->swap_args.version = NFS_ARGSVERSION;
  nd->swap_args.rsize = 8192;
  nd->swap_args.wsize = 8192;
  nd->swap_args.sotype = SOCK_DGRAM;
  nd->swap_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
  
  myaddr.sin_addr = reply.yiaddr;

  ip = ntohl(myaddr.sin_addr.s_addr);
  sprintf(lookup_path,"swap.%d.%d.%d.%d",
	  ip >> 24, (ip >> 16) & 255 ,(ip >> 8) & 255 ,ip & 255 );

  printip("My ip address",myaddr.sin_addr);

  printip("Server ip address",reply.siaddr);

  gw.sin_addr = reply.giaddr;
  printip("Gateway ip address",reply.giaddr);

  if (reply.sname[0])
    printf("Server name is %s\n",reply.sname);
  if (reply.file[0])
    printf("boot file is %s\n",reply.file);
  if (reply.vend[0]==99 && reply.vend[1]==130 &&
      reply.vend[2]==83 && reply.vend[3]==99) {
    j=4;
    ncode = reply.vend[j];
    while (j<sizeof(reply.vend)) {
      code = reply.vend[j] = ncode;
      if (code==255)
	break;
      if (code==0) {
	j++;
	continue;
      }
      len = reply.vend[j+1];
      j+=2;
      if (len+j>=sizeof(reply.vend)) {
	printf("Truncated field");
	break;
      }
      ncode = reply.vend[j+len];
      reply.vend[j+len]='\0';
      p = &reply.vend[j];
      switch (code) {
      case 1:
	if (len!=4) 
	  panic("bootpc: subnet mask len is %d",len);
	bcopy(&reply.vend[j],&netmask.sin_addr,4);
	gotnetmask=1;
	printip("Subnet mask",netmask.sin_addr);
	break;
      case 6:	/* Domain Name servers. Unused */
      case 16:	/* Swap server IP address. unused */
      case 2:
	/* Time offset */
	break;
      case 3:
	/* Routers */
	if (len % 4) 
	  panic("bootpc: Router Len is %d",len);
	if (len > 0) {
	  bcopy(&reply.vend[j],&gw.sin_addr,4);
	  printip("Router",gw.sin_addr);
	  gotgw=1;
	}
	break;
      case 17:
	if (setfs(&nd->root_saddr, nd->root_hostnam, p)) {
	  printf("rootfs is %s\n",p);
	  gotrootpath=1;
	} else 
	  panic("Failed to set rootfs to %s",p);
	break;
      case 12:
	if (len>=MAXHOSTNAMELEN)
	  panic("bootpc: hostname  >=%d bytes",MAXHOSTNAMELEN);
	strncpy(nd->my_hostnam,&reply.vend[j],len);
	nd->my_hostnam[len]=0;
	strncpy(hostname,&reply.vend[j],len);
	hostname[len]=0;
	printf("Hostname is %s\n",hostname);
	break;
      case 128:
	if (setfs(&nd->swap_saddr, nd->swap_hostnam, p)) {
	  gotswappath=1;
	  printf("swapfs is %s\n",p);
	} else
	  panic("Failed to set swapfs to %s",p);
	break;
      case 129:
	{
	  int swaplen;
	  if (len!=4) 
	    panic("bootpc: Expected 4 bytes for swaplen, not %d bytes",len);
	  bcopy(&reply.vend[j],&swaplen,4);
	  nd->swap_nblks = ntohl(swaplen);
	  printf("bootpc: Swap size is %d KB\n",nd->swap_nblks);
	}
	break;
      case 130:	/* root mount options */
	mountopts(&nd->root_args,p);
	break;
      case 131:	/* swap mount options */
	mountopts(&nd->swap_args,p);
	break;
      default:
	printf("Ignoring field type %d\n",code);
      }
      j+=len;
    }
  }

  if (!gotswappath)
    nd->swap_nblks = 0;
#ifdef BOOTP_NFSROOT
  if (!gotrootpath)
    panic("bootpc: No root path offered");
#endif

  if (!gotnetmask) {
    if (IN_CLASSA(ntohl(myaddr.sin_addr.s_addr)))
      netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
    else if (IN_CLASSB(ntohl(myaddr.sin_addr.s_addr)))
      netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
    else 
      netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
  }
  if (!gotgw) {
    /* Use proxyarp */
    gw.sin_addr.s_addr = myaddr.sin_addr.s_addr;
  }
  
#if 0
  bootpboot_p_iflist();
  bootpboot_p_rtlist();
#endif
  error = bootpc_adjust_interface(&ireq,so,
				  &myaddr,&netmask,&gw,procp);
  
  soclose(so);

#if 0
  bootpboot_p_iflist();
  bootpboot_p_rtlist();
#endif

  if (gotrootpath) {

    error = md_mount(&nd->root_saddr, nd->root_hostnam, 
		     nd->root_fh, &nd->root_fhsize,
		     &nd->root_args,procp);
    if (error)
      panic("nfs_boot: mountd root, error=%d", error);
    
    if (gotswappath) {

      error = md_mount(&nd->swap_saddr, 
		       nd->swap_hostnam,
		       nd->swap_fh, &nd->swap_fhsize,&nd->swap_args,procp);
      if (error)
	panic("nfs_boot: mountd swap, error=%d", error);
      
      error = md_lookup_swap(&nd->swap_saddr,lookup_path,nd->swap_fh, 
			     &nd->swap_fhsize, &nd->swap_args,procp);
      if (error)
	panic("nfs_boot: lookup swap, error=%d", error);
    }
    nfs_diskless_valid = 3;
  }


  bcopy(&myaddr,&nd->myif.ifra_addr,sizeof(myaddr));
  bcopy(&myaddr,&nd->myif.ifra_broadaddr,sizeof(myaddr));
  ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 
    myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  bcopy(&netmask,&nd->myif.ifra_mask,sizeof(netmask));

#if 0
  bootpboot_p_iflist();
  bootpboot_p_rtlist();
#endif
  return;
}

/*
 * RPC: mountd/mount
 * Given a server pathname, get an NFS file handle.
 * Also, sets sin->sin_port to the NFS service port.
 */
static int
md_mount(mdsin, path, fhp, fhsizep, args, procp)
	struct sockaddr_in *mdsin;		/* mountd server address */
	char *path;
	u_char *fhp;
	int *fhsizep;
	struct nfs_args *args;
	struct proc *procp;
{
	struct mbuf *m;
	int error;
	int authunixok;
	int authcount;
	int authver;

#ifdef BOOTP_NFSV3
	/* First try NFS v3 */
	/* Get port number for MOUNTD. */
	error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
						 &mdsin->sin_port, procp);
	if (!error) {
	  m = xdr_string_encode(path, strlen(path));
	  
	  /* Do RPC to mountd. */
	  error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
			    RPCMNT_MOUNT, &m, NULL, curproc);
	}
	if (!error) {
	  args->flags |= NFSMNT_NFSV3;
	} else {
#endif
	  /* Fallback to NFS v2 */
	  
	  /* Get port number for MOUNTD. */
	  error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
			       &mdsin->sin_port, procp);
	  if (error) return error;
	  
	  m = xdr_string_encode(path, strlen(path));
	  
	  /* Do RPC to mountd. */
	  error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
			    RPCMNT_MOUNT, &m, NULL, curproc);
	  if (error)
	    return error;	/* message already freed */

#ifdef BOOTP_NFSV3
	}
#endif

	if (xdr_int_decode(&m,&error) || error)
	  goto bad;

	if (args->flags & NFSMNT_NFSV3) {
	  if (xdr_int_decode(&m,fhsizep) ||
	      *fhsizep > NFSX_V3FHMAX || *fhsizep <= 0 ) 
	    goto bad;
	} else 
	  *fhsizep = NFSX_V2FH;

	if (xdr_opaque_decode(&m,fhp,*fhsizep))
	  goto bad;

	if (args->flags & NFSMNT_NFSV3) {
	  if (xdr_int_decode(&m,&authcount))
	    goto bad;
	  authunixok = 0;
	  if (authcount<0 || authcount>100)
	    goto bad;
	  while (authcount>0) {
	    if (xdr_int_decode(&m,&authver))
	      goto bad;
	    if (authver == RPCAUTH_UNIX)
	      authunixok = 1;
	    authcount--;
	  }
	  if (!authunixok)
	    goto bad;
	}
	  
	/* Set port number for NFS use. */
	error = krpc_portmap(mdsin, NFS_PROG, 
			     (args->flags & NFSMNT_NFSV3)?NFS_VER3:NFS_VER2,
			     &mdsin->sin_port, procp);

	goto out;

bad:
	error = EBADRPC;

out:
	m_freem(m);
	return error;
}


static int md_lookup_swap(mdsin, path, fhp, fhsizep, args, procp)
	struct sockaddr_in *mdsin;		/* mountd server address */
	char *path;
	u_char *fhp;
	int *fhsizep;
	struct nfs_args *args;
	struct proc *procp;
{
	struct mbuf *m;
	int error;
	int size = -1;
	int attribs_present;
	int status;
	union {
	  u_int32_t v2[17];
	  u_int32_t v3[21];
	} fattribs;

	m = m_get(M_WAIT,MT_DATA);
	if (!m)
	  	return ENOBUFS;

	if (args->flags & NFSMNT_NFSV3) {
	  *mtod(m,u_int32_t *) = txdr_unsigned(*fhsizep);
	  bcopy(fhp,mtod(m,u_char *)+sizeof(u_int32_t),*fhsizep);
	  m->m_len = *fhsizep + sizeof(u_int32_t);
	} else {
	  bcopy(fhp,mtod(m,u_char *),NFSX_V2FH);
	  m->m_len = NFSX_V2FH;
	}
	
	m->m_next = xdr_string_encode(path, strlen(path));
	if (!m->m_next) {
	  error = ENOBUFS;
	  goto out;
	}

	/* Do RPC to nfsd. */
	if (args->flags & NFSMNT_NFSV3)
	  error = krpc_call(mdsin, NFS_PROG, NFS_VER3,
			    NFSPROC_LOOKUP, &m, NULL, procp);
	else 
	  error = krpc_call(mdsin, NFS_PROG, NFS_VER2,
			    NFSV2PROC_LOOKUP, &m, NULL, procp);
	if (error)
	  return error;	/* message already freed */

	if (xdr_int_decode(&m,&status))
	  goto bad;
	if (status) {
	  error = ENOENT;
	  goto out;
	}
	
	if (args->flags & NFSMNT_NFSV3) {
	  if (xdr_int_decode(&m,fhsizep) ||
	      *fhsizep > NFSX_V3FHMAX || *fhsizep <= 0 ) 
	    goto bad;
	} else
	  *fhsizep = NFSX_V2FH;
	
	if (xdr_opaque_decode(&m, fhp, *fhsizep))
	  goto bad;

	if (args->flags & NFSMNT_NFSV3) {
	  if (xdr_int_decode(&m,&attribs_present))
	    goto bad;
	  if (attribs_present) {
	    if (xdr_opaque_decode(&m,(u_char *) &fattribs.v3,
				  sizeof(u_int32_t)*21))
	      goto bad;
	    size = fxdr_unsigned(u_int32_t, fattribs.v3[6]);
	  }
	} else {
  	  if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2,
				sizeof(u_int32_t)*17))
	    goto bad;
	  size = fxdr_unsigned(u_int32_t, fattribs.v2[5]);
	}
	  
	if (!nfsv3_diskless.swap_nblks && size!= -1) {
	  nfsv3_diskless.swap_nblks = size/1024;
	  printf("md_lookup_swap: Swap size is %d KB\n",
		 nfsv3_diskless.swap_nblks);
	}
	
	goto out;

bad:
	error = EBADRPC;

out:
	m_freem(m);
	return error;
}