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freebsd-nq/sys/i386/boot/netboot/main.c
Bruce Evans 8a8a7f91ae Fixed warnings for pointer versus int type mismatches. Addresses must 
be converted to fixed-sized integers when they are passed across the
binary interface to the kernel.
1998-10-10 14:02:07 +00:00

716 lines
20 KiB
C
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/**************************************************************************
NETBOOT - BOOTP/TFTP Bootstrap Program
Author: Martin Renters
Date: Dec/93
**************************************************************************/
/* #define MDEBUG */
#include "netboot.h"
int jmp_bootmenu[10];
struct exec head;
char *loadpoint;
char *kernel;
char kernel_buf[128];
void (*kernelentry)();
struct nfs_diskless nfsdiskless;
int hostnamelen;
char config_buffer[512]; /* Max TFTP packet */
struct bootinfo bootinfo;
int root_nfs_port;
unsigned long netmask;
char kernel_handle[32];
int offset, howto;
extern char eth_driver[];
extern char packet[];
extern int packetlen, rpc_id;
char broadcast[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
/**************************************************************************
MAIN - Kick off routine
**************************************************************************/
main()
{
int c;
extern char edata[], end[];
bzero(edata,end-edata); /* Zero BSS */
#ifdef ASK_BOOT
while (1) {
printf("\nBoot from Network (Y/N) ? ");
c = getchar();
if ((c >= 'a') && (c <= 'z')) c &= 0x5F;
if (c == '\r') break;
putchar(c);
if (c == 'N')
exit(0);
if (c == 'Y')
break;
printf(" - bad response\n\r");
}
#endif
/* get the bios's idea about the disks geometry */
for(c = 0; c < N_BIOS_GEOM; c ++)
bootinfo.bi_bios_geom[c] = get_diskinfo(c + 0x80);
gateA20();
printf("\nBOOTP/TFTP/NFS bootstrap loader ESC for menu\n"
"\nSearching for adapter...");
if (!eth_probe()) {
printf("No adapter found.\n");
exit(0);
}
kernel = DEFAULT_BOOTFILE;
while (1) {
if (setjmp(jmp_bootmenu))
bootmenu();
else
load();
}
}
void
nfsload(length)
{
int err, read_size;
while (length > 0) {
read_size = length > NFS_READ_SIZE ?
NFS_READ_SIZE : length;
if ((err = nfs_read(ARP_ROOTSERVER, root_nfs_port,
&kernel_handle, offset, read_size, loadpoint)) !=
read_size) {
if (err < 0) {
printf("Unable to read data: ");
nfs_err(err);
}
longjmp(jmp_bootmenu, 1);
}
loadpoint += err;
length -= err;
offset += err;
}
}
/**************************************************************************
LOAD - Try to get booted
**************************************************************************/
load()
{
char *p,*q;
char cfg[64];
int root_mount_port;
int swap_nfs_port;
int swap_mount_port;
char cmd_line[80];
int err, read_size, i;
long addr, broadcast;
int swsize;
unsigned long pad;
config_buffer[0]='\0'; /* clear; bootp might fill this up */
/* Initialize this early on */
nfsdiskless.root_args.rsize = 8192;
nfsdiskless.root_args.wsize = 8192;
nfsdiskless.swap_args.rsize = 8192;
nfsdiskless.swap_args.wsize = 8192;
nfsdiskless.root_args.sotype = SOCK_DGRAM;
nfsdiskless.root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE |
NFSMNT_RESVPORT);
nfsdiskless.swap_args.sotype = SOCK_DGRAM;
nfsdiskless.swap_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE |
NFSMNT_RESVPORT);
/* Find a server to get BOOTP reply from */
if (!arptable[ARP_CLIENT].ipaddr || !arptable[ARP_SERVER].ipaddr) {
printf("\r\nSearching for server...\r\n");
if (!bootp()) {
printf("No Server found.\r\n");
longjmp(jmp_bootmenu,1);
}
}
printf("My IP %I, Server IP %I, GW IP %I\r\n",
arptable[ARP_CLIENT].ipaddr,
arptable[ARP_SERVER].ipaddr,
arptable[ARP_GATEWAY].ipaddr);
#ifdef MDEBUG
printf("\n=>>"); getchar();
#endif
/*** check if have got info from bootp ***/
if (config_buffer[0])
goto cfg_done;
#ifndef NO_TFTP
/* Now use TFTP to load configuration file */
sprintf(cfg,"/tftpboot/freebsd.%I",arptable[ARP_CLIENT].ipaddr);
if (tftp(cfg) || tftp(cfg+10))
goto cfg_done;
cfg[17]='\0';
if (tftp(cfg) || tftp(cfg+10))
goto cfg_done;
sprintf(cfg,"/tftpboot/cfg.%I",arptable[ARP_CLIENT].ipaddr);
if (tftp(cfg) || tftp(cfg+10))
goto cfg_done;
#endif
/* not found; using default values... */
sprintf(config_buffer,"rootfs %I:/usr/diskless_root",
arptable[ARP_SERVER].ipaddr);
printf("Unable to load config file, guessing:\r\n\t%s\r\n",
config_buffer);
cfg_done:
#ifdef MDEBUG
printf("\n=>>"); getchar();
#endif
p = config_buffer;
while(*p) {
q = cmd_line;
while ((*p != '\n') && (*p)) *(q++) = *(p++);
*q = 0;
printf("%s\r\n",cmd_line);
execute(cmd_line);
if (*p) p++;
}
#ifdef MDEBUG
printf("\n=>>"); getchar();
#endif
/* Check to make sure we've got a rootfs */
if (!arptable[ARP_ROOTSERVER].ipaddr) {
printf("No ROOT filesystem server!\r\n");
longjmp(jmp_bootmenu,1);
}
/* Fill in nfsdiskless.myif */
sprintf(&nfsdiskless.myif.ifra_name,eth_driver);
nfsdiskless.myif.ifra_addr.sa_len = sizeof(struct sockaddr);
nfsdiskless.myif.ifra_addr.sa_family = AF_INET;
addr = htonl(arptable[ARP_CLIENT].ipaddr);
bcopy(&addr, &nfsdiskless.myif.ifra_addr.sa_data[2], 4);
broadcast = (addr & netmask) | ~netmask;
nfsdiskless.myif.ifra_broadaddr.sa_len = sizeof(struct sockaddr);
nfsdiskless.myif.ifra_broadaddr.sa_family = AF_INET;
bcopy(&broadcast, &nfsdiskless.myif.ifra_broadaddr.sa_data[2], 4);
addr = htonl(arptable[ARP_GATEWAY].ipaddr);
if (addr) {
nfsdiskless.mygateway.sin_len = sizeof(struct sockaddr);
nfsdiskless.mygateway.sin_family = AF_INET;
bcopy(&addr, &nfsdiskless.mygateway.sin_addr, 4);
} else {
nfsdiskless.mygateway.sin_len = 0;
}
nfsdiskless.myif.ifra_mask.sa_len = sizeof(struct sockaddr);
nfsdiskless.myif.ifra_mask.sa_family = AF_UNSPEC;
bcopy(&netmask, &nfsdiskless.myif.ifra_mask.sa_data[2], 4);
rpc_id = currticks();
/* Lookup NFS/MOUNTD ports for SWAP using PORTMAP */
if (arptable[ARP_SWAPSERVER].ipaddr) {
char swapfs_fh[32], swapfile[32];
swap_nfs_port = rpclookup(ARP_SWAPSERVER, PROG_NFS, 2);
swap_mount_port = rpclookup(ARP_SWAPSERVER, PROG_MOUNT, 1);
if ((swap_nfs_port == -1) || (swap_mount_port == -1)) {
printf("Unable to get SWAP NFS/MOUNT ports\r\n");
longjmp(jmp_bootmenu,1);
}
if (err = nfs_mount(ARP_SWAPSERVER, swap_mount_port,
nfsdiskless.swap_hostnam, &swapfs_fh)) {
printf("Unable to mount SWAP filesystem: ");
nfs_err(err);
longjmp(jmp_bootmenu,1);
}
sprintf(swapfile,"swap.%I",arptable[ARP_CLIENT].ipaddr);
if (err = nfs_lookup(ARP_SWAPSERVER, swap_nfs_port,
&swapfs_fh, swapfile, &nfsdiskless.swap_fh, &swsize)) {
printf("Unable to open %s: ",swapfile);
nfs_err(err);
longjmp(jmp_bootmenu,1);
}
if (!nfsdiskless.swap_nblks) {
nfsdiskless.swap_nblks = swsize / 1024;
printf("Swap size is: %d blocks\n",nfsdiskless.swap_nblks);
}
nfsdiskless.swap_saddr.sin_len = sizeof(struct sockaddr_in);
nfsdiskless.swap_saddr.sin_family = AF_INET;
nfsdiskless.swap_saddr.sin_port = htons(swap_nfs_port);
nfsdiskless.swap_saddr.sin_addr.s_addr =
htonl(arptable[ARP_SWAPSERVER].ipaddr);
nfsdiskless.swap_args.timeo = 10;
nfsdiskless.swap_args.retrans = 100;
}
/* Lookup NFS/MOUNTD ports for ROOT using PORTMAP */
root_nfs_port = rpclookup(ARP_ROOTSERVER, PROG_NFS, 2);
root_mount_port = rpclookup(ARP_ROOTSERVER, PROG_MOUNT, 1);
if ((root_nfs_port == -1) || (root_mount_port == -1)) {
printf("Unable to get ROOT NFS/MOUNT ports\r\n");
longjmp(jmp_bootmenu,1);
}
if (err = nfs_mount(ARP_ROOTSERVER, root_mount_port,
nfsdiskless.root_hostnam, &nfsdiskless.root_fh)) {
printf("Unable to mount ROOT filesystem: ");
nfs_err(err);
longjmp(jmp_bootmenu,1);
}
nfsdiskless.root_saddr.sin_len = sizeof(struct sockaddr_in);
nfsdiskless.root_saddr.sin_family = AF_INET;
nfsdiskless.root_saddr.sin_port = htons(root_nfs_port);
nfsdiskless.root_saddr.sin_addr.s_addr =
htonl(arptable[ARP_ROOTSERVER].ipaddr);
nfsdiskless.root_args.timeo = 10;
nfsdiskless.root_args.retrans = 100;
nfsdiskless.root_time = 0;
if (err = nfs_lookup(ARP_ROOTSERVER, root_nfs_port,
&nfsdiskless.root_fh, *kernel == '/' ? kernel+1 : kernel,
&kernel_handle, NULL)) {
printf("Unable to open %s: ",kernel);
nfs_err(err);
longjmp(jmp_bootmenu,1);
}
/* Load the kernel using NFS */
printf("Loading %s...\r\n",kernel);
if ((err = nfs_read(ARP_ROOTSERVER, root_nfs_port, &kernel_handle, 0,
sizeof(struct exec), &head)) < 0) {
printf("Unable to read %s: ",kernel);
nfs_err(err);
longjmp(jmp_bootmenu,1);
}
if (N_BADMAG(head)) {
printf("Bad executable format!\r\n");
longjmp(jmp_bootmenu, 1);
}
loadpoint = (char *)(head.a_entry & 0x00FFFFFF);
offset = N_TXTOFF(head);
printf("text=0x%X, ",head.a_text);
nfsload(head.a_text);
while (((int)loadpoint) & PAGE_MASK)
*(loadpoint++) = 0;
printf("data=0x%X, ",head.a_data);
nfsload(head.a_data);
printf("bss=0x%X, ",head.a_bss);
while(head.a_bss--) *(loadpoint++) = 0;
while (((int)loadpoint) & PAGE_MASK)
*(loadpoint++) = 0;
bootinfo.bi_symtab = (u_int32_t)loadpoint;
p = (char*)&head.a_syms;
for (i=0;i<sizeof(head.a_syms);i++)
*loadpoint++ = *p++;
printf("symbols=[+0x%x+0x%x", sizeof(head.a_syms), head.a_syms);
nfsload(head.a_syms);
i = sizeof(int);
p = loadpoint;
nfsload(i);
i = *(int*)p;
printf("+0x%x]\n", i);
i -= sizeof(int);
nfsload(i);
bootinfo.bi_esymtab = (u_int32_t)loadpoint;
printf("entry=0x%X.\n\r",head.a_entry);
/* Jump to kernel */
bootinfo.bi_version = BOOTINFO_VERSION;
bootinfo.bi_kernelname = (u_int32_t)kernel;
bootinfo.bi_nfs_diskless = (u_int32_t)&nfsdiskless;
bootinfo.bi_size = sizeof bootinfo;
kernelentry = (void *)(head.a_entry & 0x00FFFFFF);
(*kernelentry)(howto|RB_BOOTINFO,NODEV,0,0,0,&bootinfo,0,0,0);
printf("*** %s execute failure ***\n",kernel);
}
/**************************************************************************
POLLKBD - Check for Interrupt from keyboard
**************************************************************************/
pollkbd()
{
#ifndef SECURE_BOOT
if (iskey() && (getchar() == ESC)) longjmp(jmp_bootmenu,1);
#endif
}
/**************************************************************************
DEFAULT_NETMASK - Set a default netmask for IP address
**************************************************************************/
default_netmask()
{
int net = arptable[ARP_CLIENT].ipaddr >> 24;
if (net <= 127)
netmask = htonl(0xff000000);
else if (net < 192)
netmask = htonl(0xffff0000);
else
netmask = htonl(0xffffff00);
}
/**************************************************************************
UDP_TRANSMIT - Send a UDP datagram
**************************************************************************/
udp_transmit(destip, srcsock, destsock, len, buf)
unsigned long destip;
unsigned short srcsock, destsock;
int len;
char *buf;
{
struct iphdr *ip;
struct udphdr *udp;
struct arprequest arpreq;
int arpentry, i;
unsigned long time;
int retry = MAX_ARP_RETRIES;
ip = (struct iphdr *)buf;
udp = (struct udphdr *)(buf + sizeof(struct iphdr));
ip->verhdrlen = 0x45;
ip->service = 0;
ip->len = htons(len);
ip->ident = 0;
ip->frags = 0;
ip->ttl = 60;
ip->protocol = IP_UDP;
ip->chksum = 0;
convert_ipaddr(ip->src, &arptable[ARP_CLIENT].ipaddr);
convert_ipaddr(ip->dest, &destip);
ip->chksum = ipchksum(buf, sizeof(struct iphdr));
udp->src = htons(srcsock);
udp->dest = htons(destsock);
udp->len = htons(len - sizeof(struct iphdr));
udp->chksum = 0;
if (destip == IP_BROADCAST) {
eth_transmit(broadcast, IP, len, buf);
} else {
long h_netmask = ntohl(netmask);
/* Check to see if we need gateway */
if (((destip & h_netmask) !=
(arptable[ARP_CLIENT].ipaddr & h_netmask)) &&
arptable[ARP_GATEWAY].ipaddr)
destip = arptable[ARP_GATEWAY].ipaddr;
for(arpentry = 0; arpentry<MAX_ARP; arpentry++)
if (arptable[arpentry].ipaddr == destip) break;
if (arpentry == MAX_ARP) {
printf("%I is not in my arp table!\n");
return(0);
}
for (i = 0; i<ETHER_ADDR_LEN; i++)
if (arptable[arpentry].node[i]) break;
if (i == ETHER_ADDR_LEN) { /* Need to do arp request */
arpreq.hwtype = htons(1);
arpreq.protocol = htons(IP);
arpreq.hwlen = ETHER_ADDR_LEN;
arpreq.protolen = 4;
arpreq.opcode = htons(ARP_REQUEST);
bcopy(arptable[ARP_CLIENT].node, arpreq.shwaddr,
ETHER_ADDR_LEN);
convert_ipaddr(arpreq.sipaddr,
&arptable[ARP_CLIENT].ipaddr);
bzero(arpreq.thwaddr, ETHER_ADDR_LEN);
convert_ipaddr(arpreq.tipaddr, &destip);
while (retry--) {
eth_transmit(broadcast, ARP, sizeof(arpreq),
&arpreq);
if (await_reply(AWAIT_ARP, arpentry,
arpreq.tipaddr)) goto xmit;
}
return(0);
}
xmit: eth_transmit(arptable[arpentry].node, IP, len, buf);
}
return(1);
}
/**************************************************************************
TFTP - Try to load configuation file
**************************************************************************/
tftp(name)
char *name;
{
struct tftp_t *tr;
int retry = MAX_TFTP_RETRIES;
static unsigned short isocket = 2000;
unsigned short osocket = TFTP;
unsigned short len, block=1;
struct tftp_t tp;
int code;
printf("Loading %s...\r\n",name);
isocket++;
tp.opcode = htons(TFTP_RRQ);
len = (sprintf((char *)tp.u.rrq,"%s%c%s",name,0,"octet")
- ((char *)&tp)) + 1;
while(retry--) {
if (!udp_transmit(arptable[ARP_SERVER].ipaddr, isocket, osocket,
len, &tp)) return(0);
if (await_reply(AWAIT_TFTP, isocket, NULL)) {
tr = (struct tftp_t *)&packet[ETHER_HDR_LEN];
if (tr->opcode == ntohs(TFTP_ERROR)) {
printf("TFTP error %d (%s)\r\n",
ntohs(tr->u.err.errcode),
tr->u.err.errmsg);
return(0);
} /* ACK PACKET */
if (tr->opcode != ntohs(TFTP_DATA)) return(0);
osocket = ntohs(tr->udp.src);
tp.opcode = htons(TFTP_ACK);
tp.u.ack.block = tr->u.data.block;
udp_transmit(arptable[ARP_SERVER].ipaddr, isocket,
osocket, TFTP_MIN_PACKET_SIZE, &tp);
len = ntohs(tr->udp.len) - sizeof(struct udphdr) - 4;
if (len >= 512) {
printf("Config file too large.\r\n");
config_buffer[0] = 0;
return(0);
} else {
bcopy(tr->u.data.download, config_buffer, len);
config_buffer[len] = 0;
}
return(1);
}
}
return(0);
}
/**************************************************************************
BOOTP - Get my IP address and load information
**************************************************************************/
bootp()
{
int retry = MAX_BOOTP_RETRIES;
struct bootp_t bp;
unsigned long starttime;
bzero(&bp, sizeof(struct bootp_t));
bp.bp_op = BOOTP_REQUEST;
bp.bp_htype = 1;
bp.bp_hlen = ETHER_ADDR_LEN;
bp.bp_xid = starttime = currticks();
bcopy(arptable[ARP_CLIENT].node, bp.bp_hwaddr, ETHER_ADDR_LEN);
while(retry--) {
udp_transmit(IP_BROADCAST, 0, BOOTP_SERVER,
sizeof(struct bootp_t), &bp);
if (await_reply(AWAIT_BOOTP, 0, NULL))
return(1);
bp.bp_secs = htons((currticks()-starttime)/20);
}
return(0);
}
/**************************************************************************
AWAIT_REPLY - Wait until we get a response for our request
**************************************************************************/
await_reply(type, ival, ptr)
int type, ival;
char *ptr;
{
unsigned long time;
struct iphdr *ip;
struct udphdr *udp;
struct arprequest *arpreply;
struct bootp_t *bootpreply;
struct rpc_t *rpc;
int protohdrlen = ETHER_HDR_LEN + sizeof(struct iphdr) +
sizeof(struct udphdr);
time = currticks() + TIMEOUT;
while(time > currticks()) {
pollkbd();
if (eth_poll()) { /* We have something! */
/* Check for ARP - No IP hdr */
if ((type == AWAIT_ARP) &&
(packetlen >= ETHER_HDR_LEN +
sizeof(struct arprequest)) &&
(((packet[12] << 8) | packet[13]) == ARP)) {
arpreply = (struct arprequest *)
&packet[ETHER_HDR_LEN];
if ((arpreply->opcode == ntohs(ARP_REPLY)) &&
bcompare(arpreply->sipaddr, ptr, 4)) {
bcopy(arpreply->shwaddr,
arptable[ival].node,
ETHER_ADDR_LEN);
return(1);
}
continue;
}
/* Anything else has IP header */
if ((packetlen < protohdrlen) ||
(((packet[12] << 8) | packet[13]) != IP)) continue;
ip = (struct iphdr *)&packet[ETHER_HDR_LEN];
if ((ip->verhdrlen != 0x45) ||
ipchksum(ip, sizeof(struct iphdr)) ||
(ip->protocol != IP_UDP)) continue;
udp = (struct udphdr *)&packet[ETHER_HDR_LEN +
sizeof(struct iphdr)];
/* BOOTP ? */
bootpreply = (struct bootp_t *)&packet[ETHER_HDR_LEN];
if ((type == AWAIT_BOOTP) &&
(packetlen >= (ETHER_HDR_LEN +
sizeof(struct iphdr) +
sizeof(struct udphdr) +
BOOTP_MIN_LEN)) &&
(ntohs(udp->dest) == BOOTP_CLIENT) &&
(bootpreply->bp_op == BOOTP_REPLY)) {
convert_ipaddr(&arptable[ARP_CLIENT].ipaddr,
bootpreply->bp_yiaddr);
default_netmask();
convert_ipaddr(&arptable[ARP_SERVER].ipaddr,
bootpreply->bp_siaddr);
bzero(arptable[ARP_SERVER].node,
ETHER_ADDR_LEN); /* Kill arp */
convert_ipaddr(&arptable[ARP_GATEWAY].ipaddr,
bootpreply->bp_giaddr);
bzero(arptable[ARP_GATEWAY].node,
ETHER_ADDR_LEN); /* Kill arp */
if (bootpreply->bp_file[0]) {
bcopy(bootpreply->bp_file,
kernel_buf, 128);
kernel = kernel_buf;
}
decode_rfc1048(bootpreply->bp_vend);
return(1);
}
/* TFTP ? */
if ((type == AWAIT_TFTP) &&
(ntohs(udp->dest) == ival)) return(1);
/* RPC */
rpc = (struct rpc_t *)&packet[ETHER_HDR_LEN];
if ((type == AWAIT_RPC) &&
(ntohs(udp->dest) == RPC_SOCKET) &&
(ntohl(rpc->u.reply.id) == ival) &&
(ntohl(rpc->u.reply.type) == MSG_REPLY)) {
rpc_id++;
return(1);
}
}
}
return(0);
}
void
bootp_string(char *name, char *bootp_ptr)
{
char tmp_buf[512]; /* oversized, but who cares ! */
bzero(tmp_buf, sizeof(tmp_buf));
bcopy(bootp_ptr+2, tmp_buf, TAG_LEN(bootp_ptr));
sprintf(config_buffer+strlen(config_buffer),
"%s %s\n", name, tmp_buf);
}
/**************************************************************************
DECODE_RFC1048 - Decodes RFC1048 header
**************************************************************************/
decode_rfc1048(p)
unsigned char *p;
{
static char rfc1048_cookie[4] = RFC1048_COOKIE;
unsigned char *end = p + BOOTP_VENDOR_LEN,*q;
if (bcompare(p, rfc1048_cookie, 4)) { /* RFC 1048 header */
p += 4;
while(p < end) {
switch (*p) {
case RFC1048_PAD:
p++;
continue;
case RFC1048_END:
p = end;
continue;
case RFC1048_GATEWAY:
convert_ipaddr(&arptable[ARP_GATEWAY].ipaddr,
p+2);
break;
case RFC1048_NETMASK:
bcopy(p+2,&netmask,4);
break;
case RFC1048_HOSTNAME:
bcopy(p+2, &nfsdiskless.my_hostnam, TAG_LEN(p));
hostnamelen = (TAG_LEN(p) + 3) & ~3;
break;
case RFC1048_ROOT_PATH: /* XXX check len */
bootp_string("rootfs", p);
break;
case RFC1048_SWAP_PATH:
bootp_string("swapfs", p);
break;
case RFC1048_SWAP_LEN: /* T129 */
sprintf(config_buffer+strlen(config_buffer),
"swapsize %d\n", ntohl(*(long *)(p+2)) );
break;
case 130: /* root mount options */
bootp_string("rootopts", p);
break;
case 131: /* swap mount options */
bootp_string("swapopts", p);
break;
case 132: /* any other options */
case 133:
case 134:
case 135:
case 136:
case 137:
case 138:
case 139:
case 140:
case 141:
bootp_string("", p);
break;
default:
printf("Unknown RFC1048-tag ");
for(q=p;q<p+2+TAG_LEN(p);q++)
printf("%x ",*q);
printf("\n\r");
}
p += TAG_LEN(p) + 2;
}
}
}
/**************************************************************************
IPCHKSUM - Checksum IP Header
**************************************************************************/
ipchksum(ip, len)
unsigned short *ip;
int len;
{
unsigned long sum = 0;
len >>= 1;
while (len--) {
sum += *(ip++);
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
return((~sum) & 0x0000FFFF);
}
/**************************************************************************
CONVERT_IPADDR - Convert IP address from net to machine order
**************************************************************************/
convert_ipaddr(d, s)
char *d,*s;
{
*(d+3) = *s;
*(d+2) = *(s+1);
*(d+1) = *(s+2);
*d = *(s+3);
}
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