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10e629b937
freebsd/usr.sbin/ppp/ipcp.c
Brian Somers 10e629b937 Introduce LOCALNAT and LOCALRAD defines so that the sources can stay 
exactly the same in FreeBSD & OpenBSD despite libalias and libradius
being local to the ppp sources under OpenBSD.
2000-03-14 01:47:02 +00:00

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/*
* PPP IP Control Protocol (IPCP) Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $FreeBSD$
*
* TODO:
* o Support IPADDRS properly
* o Validate the length in IpcpDecodeConfig
*/
#include <sys/param.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/route.h>
#include <netdb.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#ifndef NONAT
#ifdef LOCALNAT
#include "alias.h"
#else
#include <alias.h>
#endif
#endif
#include "layer.h"
#include "ua.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "proto.h"
#include "lcp.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "vjcomp.h"
#include "async.h"
#include "ccp.h"
#include "link.h"
#include "physical.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "id.h"
#include "arp.h"
#include "systems.h"
#include "prompt.h"
#include "route.h"
#include "iface.h"
#include "ip.h"
#undef REJECTED
#define REJECTED(p, x) ((p)->peer_reject & (1<<(x)))
#define issep(ch) ((ch) == ' ' || (ch) == '\t')
#define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.')
static u_short default_urgent_tcp_ports[] = {
21, /* ftp */
22, /* ssh */
23, /* telnet */
513, /* login */
514, /* shell */
543, /* klogin */
544 /* kshell */
};
static u_short default_urgent_udp_ports[] = { };
#define NDEFTCPPORTS \
(sizeof default_urgent_tcp_ports / sizeof default_urgent_tcp_ports[0])
#define NDEFUDPPORTS \
(sizeof default_urgent_udp_ports / sizeof default_urgent_udp_ports[0])
int
ipcp_IsUrgentPort(struct port_range *range, u_short src, u_short dst)
{
int f;
for (f = 0; f < range->nports; f++)
if (range->port[f] == src || range->port[f] == dst)
return 1;
return 0;
}
void
ipcp_AddUrgentPort(struct port_range *range, u_short port)
{
u_short *newport;
int p;
if (range->nports == range->maxports) {
range->maxports += 10;
newport = (u_short *)realloc(range->port,
range->maxports * sizeof(u_short));
if (newport == NULL) {
log_Printf(LogERROR, "ipcp_AddUrgentPort: realloc: %s\n",
strerror(errno));
range->maxports -= 10;
return;
}
range->port = newport;
}
for (p = 0; p < range->nports; p++)
if (range->port[p] == port) {
log_Printf(LogWARN, "%u: Port already set to urgent\n", port);
break;
} else if (range->port[p] > port) {
memmove(range->port + p + 1, range->port + p,
(range->nports - p) * sizeof(u_short));
range->port[p] = port;
range->nports++;
break;
}
if (p == range->nports)
range->port[range->nports++] = port;
}
void
ipcp_RemoveUrgentPort(struct port_range *range, u_short port)
{
int p;
for (p = 0; p < range->nports; p++)
if (range->port[p] == port) {
if (p != range->nports - 1)
memmove(range->port + p, range->port + p + 1,
(range->nports - p - 1) * sizeof(u_short));
range->nports--;
return;
}
if (p == range->nports)
log_Printf(LogWARN, "%u: Port not set to urgent\n", port);
}
void
ipcp_ClearUrgentPorts(struct port_range *range)
{
range->nports = 0;
}
struct compreq {
u_short proto;
u_char slots;
u_char compcid;
};
static int IpcpLayerUp(struct fsm *);
static void IpcpLayerDown(struct fsm *);
static void IpcpLayerStart(struct fsm *);
static void IpcpLayerFinish(struct fsm *);
static void IpcpInitRestartCounter(struct fsm *, int);
static void IpcpSendConfigReq(struct fsm *);
static void IpcpSentTerminateReq(struct fsm *);
static void IpcpSendTerminateAck(struct fsm *, u_char);
static void IpcpDecodeConfig(struct fsm *, u_char *, int, int,
struct fsm_decode *);
static struct fsm_callbacks ipcp_Callbacks = {
IpcpLayerUp,
IpcpLayerDown,
IpcpLayerStart,
IpcpLayerFinish,
IpcpInitRestartCounter,
IpcpSendConfigReq,
IpcpSentTerminateReq,
IpcpSendTerminateAck,
IpcpDecodeConfig,
fsm_NullRecvResetReq,
fsm_NullRecvResetAck
};
static const char *
protoname(int proto)
{
static struct {
int id;
const char *txt;
} cftypes[] = {
/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
{ 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */
{ 2, "COMPPROTO" }, /* IP-Compression-Protocol */
{ 3, "IPADDR" }, /* IP-Address */
{ 129, "PRIDNS" }, /* 129: Primary DNS Server Address */
{ 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */
{ 131, "SECDNS" }, /* 131: Secondary DNS Server Address */
{ 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */
};
int f;
for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++)
if (cftypes[f].id == proto)
return cftypes[f].txt;
return NumStr(proto, NULL, 0);
}
void
ipcp_AddInOctets(struct ipcp *ipcp, int n)
{
throughput_addin(&ipcp->throughput, n);
}
void
ipcp_AddOutOctets(struct ipcp *ipcp, int n)
{
throughput_addout(&ipcp->throughput, n);
}
static void
getdns(struct ipcp *ipcp, struct in_addr addr[2])
{
FILE *fp;
addr[0].s_addr = addr[1].s_addr = INADDR_ANY;
if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
char buf[LINE_LEN], *cp, *end;
int n;
n = 0;
buf[sizeof buf - 1] = '\0';
while (fgets(buf, sizeof buf - 1, fp)) {
if (!strncmp(buf, "nameserver", 10) && issep(buf[10])) {
for (cp = buf + 11; issep(*cp); cp++)
;
for (end = cp; isip(*end); end++)
;
*end = '\0';
if (inet_aton(cp, addr+n) && ++n == 2)
break;
}
}
if (n == 1)
addr[1] = addr[0];
fclose(fp);
}
}
static int
setdns(struct ipcp *ipcp, struct in_addr addr[2])
{
FILE *fp;
char wbuf[LINE_LEN + 54];
int wlen;
if (addr[0].s_addr == INADDR_ANY || addr[1].s_addr == INADDR_ANY) {
struct in_addr old[2];
getdns(ipcp, old);
if (addr[0].s_addr == INADDR_ANY)
addr[0] = old[0];
if (addr[1].s_addr == INADDR_ANY)
addr[1] = old[1];
}
if (addr[0].s_addr == INADDR_ANY && addr[1].s_addr == INADDR_ANY) {
log_Printf(LogWARN, "%s not modified: All nameservers NAKd\n",
_PATH_RESCONF);
return 0;
}
wlen = 0;
if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
char buf[LINE_LEN];
int len;
buf[sizeof buf - 1] = '\0';
while (fgets(buf, sizeof buf - 1, fp)) {
if (strncmp(buf, "nameserver", 10) || !issep(buf[10])) {
len = strlen(buf);
if (len > sizeof wbuf - wlen) {
log_Printf(LogWARN, "%s: Can only cope with max file size %d\n",
_PATH_RESCONF, LINE_LEN);
fclose(fp);
return 0;
}
memcpy(wbuf + wlen, buf, len);
wlen += len;
}
}
fclose(fp);
}
if (addr[0].s_addr != INADDR_ANY) {
snprintf(wbuf + wlen, sizeof wbuf - wlen, "nameserver %s\n",
inet_ntoa(addr[0]));
log_Printf(LogIPCP, "Primary nameserver set to %s", wbuf + wlen + 11);
wlen += strlen(wbuf + wlen);
}
if (addr[1].s_addr != INADDR_ANY && addr[1].s_addr != addr[0].s_addr) {
snprintf(wbuf + wlen, sizeof wbuf - wlen, "nameserver %s\n",
inet_ntoa(addr[1]));
log_Printf(LogIPCP, "Secondary nameserver set to %s", wbuf + wlen + 11);
wlen += strlen(wbuf + wlen);
}
if (wlen) {
int fd;
if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_CREAT, 0644)) != -1) {
if (write(fd, wbuf, wlen) != wlen) {
log_Printf(LogERROR, "setdns: write(): %s\n", strerror(errno));
close(fd);
return 0;
}
if (ftruncate(fd, wlen) == -1) {
log_Printf(LogERROR, "setdns: truncate(): %s\n", strerror(errno));
close(fd);
return 0;
}
close(fd);
} else {
log_Printf(LogERROR, "setdns: open(): %s\n", strerror(errno));
return 0;
}
}
return 1;
}
int
ipcp_Show(struct cmdargs const *arg)
{
struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
int p;
prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
State2Nam(ipcp->fsm.state));
if (ipcp->fsm.state == ST_OPENED) {
prompt_Printf(arg->prompt, " His side: %s, %s\n",
inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
prompt_Printf(arg->prompt, " My side: %s, %s\n",
inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
prompt_Printf(arg->prompt, " Queued packets: %d\n", ip_QueueLen(ipcp));
}
if (ipcp->route) {
prompt_Printf(arg->prompt, "\n");
route_ShowSticky(arg->prompt, ipcp->route, "Sticky routes", 1);
}
prompt_Printf(arg->prompt, "\nDefaults:\n");
prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
" REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
prompt_Printf(arg->prompt, " My Address: %s/%d",
inet_ntoa(ipcp->cfg.my_range.ipaddr), ipcp->cfg.my_range.width);
prompt_Printf(arg->prompt, ", netmask %s\n", inet_ntoa(ipcp->cfg.netmask));
if (ipcp->cfg.HaveTriggerAddress)
prompt_Printf(arg->prompt, " Trigger address: %s\n",
inet_ntoa(ipcp->cfg.TriggerAddress));
prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot "
"compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
if (iplist_isvalid(&ipcp->cfg.peer_list))
prompt_Printf(arg->prompt, " His Address: %s\n",
ipcp->cfg.peer_list.src);
else
prompt_Printf(arg->prompt, " His Address: %s/%d\n",
inet_ntoa(ipcp->cfg.peer_range.ipaddr),
ipcp->cfg.peer_range.width);
prompt_Printf(arg->prompt, " DNS: %s, ",
inet_ntoa(ipcp->cfg.ns.dns[0]));
prompt_Printf(arg->prompt, "%s, %s\n", inet_ntoa(ipcp->cfg.ns.dns[1]),
command_ShowNegval(ipcp->cfg.ns.dns_neg));
prompt_Printf(arg->prompt, " NetBIOS NS: %s, ",
inet_ntoa(ipcp->cfg.ns.nbns[0]));
prompt_Printf(arg->prompt, "%s\n", inet_ntoa(ipcp->cfg.ns.nbns[1]));
prompt_Printf(arg->prompt, " Urgent ports\n");
prompt_Printf(arg->prompt, " TCP: ");
if (ipcp->cfg.urgent.tcp.nports == 0)
prompt_Printf(arg->prompt, "none");
else
for (p = 0; p < ipcp->cfg.urgent.tcp.nports; p++) {
if (p)
prompt_Printf(arg->prompt, ", ");
prompt_Printf(arg->prompt, "%u", ipcp->cfg.urgent.tcp.port[p]);
}
prompt_Printf(arg->prompt, "\n UDP: ");
if (ipcp->cfg.urgent.udp.nports == 0)
prompt_Printf(arg->prompt, "none");
else
for (p = 0; p < ipcp->cfg.urgent.udp.nports; p++) {
if (p)
prompt_Printf(arg->prompt, ", ");
prompt_Printf(arg->prompt, "%u", ipcp->cfg.urgent.udp.port[p]);
}
prompt_Printf(arg->prompt, "\n\n");
throughput_disp(&ipcp->throughput, arg->prompt);
return 0;
}
int
ipcp_vjset(struct cmdargs const *arg)
{
if (arg->argc != arg->argn+2)
return -1;
if (!strcasecmp(arg->argv[arg->argn], "slots")) {
int slots;
slots = atoi(arg->argv[arg->argn+1]);
if (slots < 4 || slots > 16)
return 1;
arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
return 0;
} else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
if (!strcasecmp(arg->argv[arg->argn+1], "on"))
arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
else
return 2;
return 0;
}
return -1;
}
void
ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
const struct fsm_parent *parent)
{
struct hostent *hp;
char name[MAXHOSTNAMELEN];
static const char * const timer_names[] =
{"IPCP restart", "IPCP openmode", "IPCP stopped"};
fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
bundle, l, parent, &ipcp_Callbacks, timer_names);
ipcp->route = NULL;
ipcp->cfg.vj.slots = DEF_VJ_STATES;
ipcp->cfg.vj.slotcomp = 1;
memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
if (gethostname(name, sizeof name) == 0) {
hp = gethostbyname(name);
if (hp && hp->h_addrtype == AF_INET)
memcpy(&ipcp->cfg.my_range.ipaddr.s_addr, hp->h_addr, hp->h_length);
}
ipcp->cfg.netmask.s_addr = INADDR_ANY;
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_setsrc(&ipcp->cfg.peer_list, "");
ipcp->cfg.HaveTriggerAddress = 0;
ipcp->cfg.ns.dns[0].s_addr = INADDR_ANY;
ipcp->cfg.ns.dns[1].s_addr = INADDR_ANY;
ipcp->cfg.ns.dns_neg = 0;
ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
ipcp->cfg.urgent.tcp.nports = ipcp->cfg.urgent.tcp.maxports = NDEFTCPPORTS;
ipcp->cfg.urgent.tcp.port = (u_short *)malloc(NDEFTCPPORTS * sizeof(u_short));
memcpy(ipcp->cfg.urgent.tcp.port, default_urgent_tcp_ports,
NDEFTCPPORTS * sizeof(u_short));
ipcp->cfg.urgent.udp.nports = ipcp->cfg.urgent.udp.maxports = NDEFUDPPORTS;
ipcp->cfg.urgent.udp.port = (u_short *)malloc(NDEFUDPPORTS * sizeof(u_short));
memcpy(ipcp->cfg.urgent.udp.port, default_urgent_udp_ports,
NDEFUDPPORTS * sizeof(u_short));
ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
memset(&ipcp->vj, '\0', sizeof ipcp->vj);
throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
ipcp_Setup(ipcp, INADDR_NONE);
}
void
ipcp_Destroy(struct ipcp *ipcp)
{
if (ipcp->cfg.urgent.tcp.maxports) {
ipcp->cfg.urgent.tcp.nports = ipcp->cfg.urgent.tcp.maxports = 0;
free(ipcp->cfg.urgent.tcp.port);
ipcp->cfg.urgent.tcp.port = NULL;
}
if (ipcp->cfg.urgent.udp.maxports) {
ipcp->cfg.urgent.udp.nports = ipcp->cfg.urgent.udp.maxports = 0;
free(ipcp->cfg.urgent.udp.port);
ipcp->cfg.urgent.udp.port = NULL;
}
}
void
ipcp_SetLink(struct ipcp *ipcp, struct link *l)
{
ipcp->fsm.link = l;
}
void
ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
{
struct iface *iface = ipcp->fsm.bundle->iface;
int pos, n;
ipcp->fsm.open_mode = 0;
ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask;
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
/* Try to give the peer a previously configured IP address */
for (n = 0; n < iface->in_addrs; n++) {
pos = iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd);
if (pos != -1) {
ipcp->cfg.peer_range.ipaddr =
iplist_setcurpos(&ipcp->cfg.peer_list, pos);
break;
}
}
if (n == iface->in_addrs)
/* Ok, so none of 'em fit.... pick a random one */
ipcp->cfg.peer_range.ipaddr = iplist_setrandpos(&ipcp->cfg.peer_list);
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
}
ipcp->heis1172 = 0;
ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr;
ipcp->peer_compproto = 0;
if (ipcp->cfg.HaveTriggerAddress) {
/*
* Some implementations of PPP require that we send a
* *special* value as our address, even though the rfc specifies
* full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
*/
ipcp->my_ip = ipcp->cfg.TriggerAddress;
log_Printf(LogIPCP, "Using trigger address %s\n",
inet_ntoa(ipcp->cfg.TriggerAddress));
} else {
/*
* Otherwise, if we've used an IP number before and it's still within
* the network specified on the ``set ifaddr'' line, we really
* want to keep that IP number so that we can keep any existing
* connections that are bound to that IP (assuming we're not
* ``iface-alias''ing).
*/
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].ifa.s_addr & ipcp->cfg.my_range.mask.s_addr) ==
(ipcp->cfg.my_range.ipaddr.s_addr & ipcp->cfg.my_range.mask.s_addr)) {
ipcp->my_ip = iface->in_addr[n].ifa;
break;
}
if (n == iface->in_addrs)
ipcp->my_ip = ipcp->cfg.my_range.ipaddr;
}
if (IsEnabled(ipcp->cfg.vj.neg)
#ifndef NORADIUS
|| (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj)
#endif
)
ipcp->my_compproto = (PROTO_VJCOMP << 16) +
((ipcp->cfg.vj.slots - 1) << 8) +
ipcp->cfg.vj.slotcomp;
else
ipcp->my_compproto = 0;
sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1);
ipcp->peer_reject = 0;
ipcp->my_reject = 0;
}
static int
ipcp_doproxyall(struct bundle *bundle,
int (*proxyfun)(struct bundle *, struct in_addr, int), int s)
{
int n, ret;
struct sticky_route *rp;
struct in_addr addr;
struct ipcp *ipcp;
ipcp = &bundle->ncp.ipcp;
for (rp = ipcp->route; rp != NULL; rp = rp->next) {
if (rp->mask.s_addr == INADDR_BROADCAST)
continue;
n = ntohl(INADDR_BROADCAST) - ntohl(rp->mask.s_addr) - 1;
if (n > 0 && n <= 254 && rp->dst.s_addr != INADDR_ANY) {
addr = rp->dst;
while (n--) {
addr.s_addr = htonl(ntohl(addr.s_addr) + 1);
log_Printf(LogDEBUG, "ipcp_doproxyall: %s\n", inet_ntoa(addr));
ret = (*proxyfun)(bundle, addr, s);
if (!ret)
return ret;
}
}
}
return 0;
}
static int
ipcp_SetIPaddress(struct bundle *bundle, struct in_addr myaddr,
struct in_addr hisaddr, int silent)
{
struct in_addr mask, oaddr, none = { INADDR_ANY };
mask = addr2mask(myaddr);
if (bundle->ncp.ipcp.ifmask.s_addr != INADDR_ANY &&
(bundle->ncp.ipcp.ifmask.s_addr & mask.s_addr) == mask.s_addr)
mask.s_addr = bundle->ncp.ipcp.ifmask.s_addr;
oaddr.s_addr = bundle->iface->in_addrs ?
bundle->iface->in_addr[0].ifa.s_addr : INADDR_ANY;
if (!iface_inAdd(bundle->iface, myaddr, mask, hisaddr,
IFACE_ADD_FIRST|IFACE_FORCE_ADD))
return -1;
if (!Enabled(bundle, OPT_IFACEALIAS) && bundle->iface->in_addrs > 1
&& myaddr.s_addr != oaddr.s_addr)
/* Nuke the old one */
iface_inDelete(bundle->iface, oaddr);
if (bundle->ncp.ipcp.cfg.sendpipe > 0 || bundle->ncp.ipcp.cfg.recvpipe > 0)
bundle_SetRoute(bundle, RTM_CHANGE, hisaddr, myaddr, none, 0, 0);
if (Enabled(bundle, OPT_SROUTES))
route_Change(bundle, bundle->ncp.ipcp.route, myaddr, hisaddr);
#ifndef NORADIUS
if (bundle->radius.valid)
route_Change(bundle, bundle->radius.routes, myaddr, hisaddr);
#endif
if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) {
int s = ID0socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
log_Printf(LogERROR, "ipcp_SetIPaddress: socket(): %s\n",
strerror(errno));
else {
if (Enabled(bundle, OPT_PROXYALL))
ipcp_doproxyall(bundle, arp_SetProxy, s);
else if (Enabled(bundle, OPT_PROXY))
arp_SetProxy(bundle, hisaddr, s);
close(s);
}
}
return 0;
}
static struct in_addr
ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
{
struct in_addr try;
u_long f;
for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
f, inet_ntoa(try));
if (ipcp_SetIPaddress(bundle, gw, try, 1) == 0) {
log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
break;
}
}
if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
try.s_addr = INADDR_ANY;
}
return try;
}
static void
IpcpInitRestartCounter(struct fsm *fp, int what)
{
/* Set fsm timer load */
struct ipcp *ipcp = fsm2ipcp(fp);
fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
switch (what) {
case FSM_REQ_TIMER:
fp->restart = ipcp->cfg.fsm.maxreq;
break;
case FSM_TRM_TIMER:
fp->restart = ipcp->cfg.fsm.maxtrm;
break;
default:
fp->restart = 1;
break;
}
}
static void
IpcpSendConfigReq(struct fsm *fp)
{
/* Send config REQ please */
struct physical *p = link2physical(fp->link);
struct ipcp *ipcp = fsm2ipcp(fp);
u_char buff[24];
struct lcp_opt *o;
o = (struct lcp_opt *)buff;
if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
memcpy(o->data, &ipcp->my_ip.s_addr, 4);
INC_LCP_OPT(TY_IPADDR, 6, o);
}
if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
if (ipcp->heis1172) {
u_int16_t proto = PROTO_VJCOMP;
ua_htons(&proto, o->data);
INC_LCP_OPT(TY_COMPPROTO, 4, o);
} else {
struct compreq req;
req.proto = htons(ipcp->my_compproto >> 16);
req.slots = (ipcp->my_compproto >> 8) & 255;
req.compcid = ipcp->my_compproto & 1;
memcpy(o->data, &req, 4);
INC_LCP_OPT(TY_COMPPROTO, 6, o);
}
}
if (IsEnabled(ipcp->cfg.ns.dns_neg) &&
!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS) &&
!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
struct in_addr dns[2];
getdns(ipcp, dns);
memcpy(o->data, &dns[0].s_addr, 4);
INC_LCP_OPT(TY_PRIMARY_DNS, 6, o);
memcpy(o->data, &dns[1].s_addr, 4);
INC_LCP_OPT(TY_SECONDARY_DNS, 6, o);
}
fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
MB_IPCPOUT);
}
static void
IpcpSentTerminateReq(struct fsm *fp)
{
/* Term REQ just sent by FSM */
}
static void
IpcpSendTerminateAck(struct fsm *fp, u_char id)
{
/* Send Term ACK please */
fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
}
static void
IpcpLayerStart(struct fsm *fp)
{
/* We're about to start up ! */
struct ipcp *ipcp = fsm2ipcp(fp);
log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
throughput_start(&ipcp->throughput, "IPCP throughput",
Enabled(fp->bundle, OPT_THROUGHPUT));
fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
}
static void
IpcpLayerFinish(struct fsm *fp)
{
/* We're now down */
struct ipcp *ipcp = fsm2ipcp(fp);
log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
throughput_stop(&ipcp->throughput);
throughput_log(&ipcp->throughput, LogIPCP, NULL);
}
void
ipcp_CleanInterface(struct ipcp *ipcp)
{
struct iface *iface = ipcp->fsm.bundle->iface;
route_Clean(ipcp->fsm.bundle, ipcp->route);
if (iface->in_addrs && (Enabled(ipcp->fsm.bundle, OPT_PROXY) ||
Enabled(ipcp->fsm.bundle, OPT_PROXYALL))) {
int s = ID0socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
log_Printf(LogERROR, "ipcp_CleanInterface: socket: %s\n",
strerror(errno));
else {
if (Enabled(ipcp->fsm.bundle, OPT_PROXYALL))
ipcp_doproxyall(ipcp->fsm.bundle, arp_ClearProxy, s);
else if (Enabled(ipcp->fsm.bundle, OPT_PROXY))
arp_ClearProxy(ipcp->fsm.bundle, iface->in_addr[0].brd, s);
close(s);
}
}
iface_inClear(ipcp->fsm.bundle->iface, IFACE_CLEAR_ALL);
}
static void
IpcpLayerDown(struct fsm *fp)
{
/* About to come down */
static int recursing;
struct ipcp *ipcp = fsm2ipcp(fp);
const char *s;
if (!recursing++) {
if (ipcp->fsm.bundle->iface->in_addrs)
s = inet_ntoa(ipcp->fsm.bundle->iface->in_addr[0].ifa);
else
s = "Interface configuration error !";
log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, s);
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, s, LINKDOWNFILE, NULL, NULL) < 0) {
if (bundle_GetLabel(fp->bundle)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKDOWNFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
}
ipcp_Setup(ipcp, INADDR_NONE);
}
recursing--;
}
int
ipcp_InterfaceUp(struct ipcp *ipcp)
{
if (ipcp_SetIPaddress(ipcp->fsm.bundle, ipcp->my_ip, ipcp->peer_ip, 0) < 0) {
log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
return 0;
}
#ifndef NONAT
if (ipcp->fsm.bundle->NatEnabled)
PacketAliasSetAddress(ipcp->my_ip);
#endif
return 1;
}
static int
IpcpLayerUp(struct fsm *fp)
{
/* We're now up */
struct ipcp *ipcp = fsm2ipcp(fp);
char tbuff[16];
log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
tbuff, inet_ntoa(ipcp->peer_ip));
if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
if (!ipcp_InterfaceUp(ipcp))
return 0;
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
if (bundle_GetLabel(fp->bundle)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKUPFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
}
fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
log_DisplayPrompts();
return 1;
}
static int
AcceptableAddr(const struct in_range *prange, struct in_addr ipaddr)
{
/* Is the given IP in the given range ? */
return (prange->ipaddr.s_addr & prange->mask.s_addr) ==
(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
}
static void
IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming PROTO_IPCP */
struct iface *iface = fp->bundle->iface;
struct ipcp *ipcp = fsm2ipcp(fp);
int type, length, gotdns, gotdnsnak, n;
u_int32_t compproto;
struct compreq *pcomp;
struct in_addr ipaddr, dstipaddr, have_ip, dns[2], dnsnak[2];
char tbuff[100], tbuff2[100];
gotdns = 0;
gotdnsnak = 0;
dnsnak[0].s_addr = dnsnak[1].s_addr = INADDR_ANY;
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
length = cp[1];
if (length == 0) {
log_Printf(LogIPCP, "%s: IPCP size zero\n", fp->link->name);
break;
}
snprintf(tbuff, sizeof tbuff, " %s[%d] ", protoname(type), length);
switch (type) {
case TY_IPADDR: /* RFC1332 */
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
if (ipaddr.s_addr == INADDR_ANY ||
iplist_ip2pos(&ipcp->cfg.peer_list, ipaddr) < 0 ||
ipcp_SetIPaddress(fp->bundle, ipcp->cfg.my_range.ipaddr,
ipaddr, 1)) {
log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
inet_ntoa(ipaddr));
/*
* If we've already had a valid address configured for the peer,
* try NAKing with that so that we don't have to upset things
* too much.
*/
for (n = 0; n < iface->in_addrs; n++)
if (iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd)
>=0) {
ipcp->peer_ip = iface->in_addr[n].brd;
break;
}
if (n == iface->in_addrs)
/* Just pick an IP number from our list */
ipcp->peer_ip = ChooseHisAddr
(fp->bundle, ipcp->cfg.my_range.ipaddr);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
memcpy(dec->rejend, cp, length);
dec->rejend += length;
} else {
memcpy(dec->nakend, cp, 2);
memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2);
dec->nakend += length;
}
break;
}
} else if (!AcceptableAddr(&ipcp->cfg.peer_range, ipaddr)) {
/*
* If destination address is not acceptable, NAK with what we
* want to use.
*/
memcpy(dec->nakend, cp, 2);
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].brd.s_addr &
ipcp->cfg.peer_range.mask.s_addr)
== (ipcp->cfg.peer_range.ipaddr.s_addr &
ipcp->cfg.peer_range.mask.s_addr)) {
/* We prefer the already-configured address */
memcpy(dec->nakend + 2, &iface->in_addr[n].brd.s_addr,
length - 2);
break;
}
if (n == iface->in_addrs)
memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2);
dec->nakend += length;
break;
}
ipcp->peer_ip = ipaddr;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
break;
case MODE_NAK:
if (AcceptableAddr(&ipcp->cfg.my_range, ipaddr)) {
/* Use address suggested by peer */
snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
inet_ntoa(ipcp->my_ip));
log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
ipcp->my_ip = ipaddr;
bundle_AdjustFilters(fp->bundle, &ipcp->my_ip, NULL);
} else {
log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
"%s: Unacceptable address!\n", inet_ntoa(ipaddr));
fsm_Close(&ipcp->fsm);
}
break;
case MODE_REJ:
ipcp->peer_reject |= (1 << type);
break;
}
break;
case TY_COMPPROTO:
pcomp = (struct compreq *)(cp + 2);
compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
pcomp->compcid;
log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
switch (mode_type) {
case MODE_REQ:
if (!IsAccepted(ipcp->cfg.vj.neg)) {
memcpy(dec->rejend, cp, length);
dec->rejend += length;
} else {
switch (length) {
case 4: /* RFC1172 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
"protocol !\n");
ipcp->heis1172 = 1;
ipcp->peer_compproto = compproto;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else {
memcpy(dec->nakend, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
memcpy(dec->nakend+2, &pcomp, 2);
dec->nakend += length;
}
break;
case 6: /* RFC1332 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
if (pcomp->slots <= MAX_VJ_STATES
&& pcomp->slots >= MIN_VJ_STATES) {
/* Ok, we can do that */
ipcp->peer_compproto = compproto;
ipcp->heis1172 = 0;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else {
/* Get as close as we can to what he wants */
ipcp->heis1172 = 0;
memcpy(dec->nakend, cp, 2);
pcomp->slots = pcomp->slots < MIN_VJ_STATES ?
MIN_VJ_STATES : MAX_VJ_STATES;
memcpy(dec->nakend+2, &pcomp, sizeof pcomp);
dec->nakend += length;
}
} else {
/* What we really want */
memcpy(dec->nakend, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
pcomp->slots = DEF_VJ_STATES;
pcomp->compcid = 1;
memcpy(dec->nakend+2, &pcomp, sizeof pcomp);
dec->nakend += length;
}
break;
default:
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
}
break;
case MODE_NAK:
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
if (pcomp->slots > MAX_VJ_STATES)
pcomp->slots = MAX_VJ_STATES;
else if (pcomp->slots < MIN_VJ_STATES)
pcomp->slots = MIN_VJ_STATES;
compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
pcomp->compcid;
} else
compproto = 0;
log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
tbuff, ipcp->my_compproto, compproto);
ipcp->my_compproto = compproto;
break;
case MODE_REJ:
ipcp->peer_reject |= (1 << type);
break;
}
break;
case TY_IPADDRS: /* RFC1172 */
memcpy(&ipaddr.s_addr, cp + 2, 4);
memcpy(&dstipaddr.s_addr, cp + 6, 4);
snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
switch (mode_type) {
case MODE_REQ:
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
case MODE_NAK:
case MODE_REJ:
break;
}
break;
case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */
case TY_SECONDARY_DNS:
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
ipcp->my_reject |= (1 << (type - TY_ADJUST_NS));
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
if (!gotdns) {
dns[0] = ipcp->cfg.ns.dns[0];
dns[1] = ipcp->cfg.ns.dns[1];
if (dns[0].s_addr == INADDR_ANY && dns[1].s_addr == INADDR_ANY)
getdns(ipcp, dns);
gotdns = 1;
}
have_ip = dns[type == TY_PRIMARY_DNS ? 0 : 1];
if (ipaddr.s_addr != have_ip.s_addr) {
/*
* The client has got the DNS stuff wrong (first request) so
* we'll tell 'em how it is
*/
memcpy(dec->nakend, cp, 2); /* copy first two (type/length) */
memcpy(dec->nakend + 2, &have_ip.s_addr, length - 2);
dec->nakend += length;
} else {
/*
* Otherwise they have it right (this time) so we send a ack packet
* back confirming it... end of story
*/
memcpy(dec->ackend, cp, length);
dec->ackend += length;
}
break;
case MODE_NAK: /* what does this mean?? */
if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
gotdnsnak = 1;
memcpy(&dnsnak[type == TY_PRIMARY_DNS ? 0 : 1].s_addr, cp + 2, 4);
}
break;
case MODE_REJ: /* Can't do much, stop asking */
ipcp->peer_reject |= (1 << (type - TY_ADJUST_NS));
break;
}
break;
case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */
case TY_SECONDARY_NBNS:
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
have_ip.s_addr =
ipcp->cfg.ns.nbns[type == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
if (have_ip.s_addr == INADDR_ANY) {
log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
ipcp->my_reject |= (1 << (type - TY_ADJUST_NS));
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
if (ipaddr.s_addr != have_ip.s_addr) {
memcpy(dec->nakend, cp, 2);
memcpy(dec->nakend+2, &have_ip.s_addr, length);
dec->nakend += length;
} else {
memcpy(dec->ackend, cp, length);
dec->ackend += length;
}
break;
case MODE_NAK:
log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", type);
break;
case MODE_REJ:
log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", type);
break;
}
break;
default:
if (mode_type != MODE_NOP) {
ipcp->my_reject |= (1 << type);
memcpy(dec->rejend, cp, length);
dec->rejend += length;
}
break;
}
plen -= length;
cp += length;
}
if (gotdnsnak)
if (!setdns(ipcp, dnsnak)) {
ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
}
if (mode_type != MODE_NOP) {
if (dec->rejend != dec->rej) {
/* rejects are preferred */
dec->ackend = dec->ack;
dec->nakend = dec->nak;
} else if (dec->nakend != dec->nak)
/* then NAKs */
dec->ackend = dec->ack;
}
}
extern struct mbuf *
ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
/* Got PROTO_IPCP from link */
m_settype(bp, MB_IPCPIN);
if (bundle_Phase(bundle) == PHASE_NETWORK)
fsm_Input(&bundle->ncp.ipcp.fsm, bp);
else {
if (bundle_Phase(bundle) < PHASE_NETWORK)
log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
l->name, bundle_PhaseName(bundle));
m_freem(bp);
}
return NULL;
}
int
ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
{
struct ipcp *ipcp = &bundle->ncp.ipcp;
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_reset(&ipcp->cfg.peer_list);
ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr = hisaddr;
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
if (ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, hisaddr, 0) < 0)
return 0;
return 1; /* Ok */
}
int
ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
{
struct ipcp *ipcp = &bundle->ncp.ipcp;
/* Use `hisaddr' for the peers address (set iface if `setaddr') */
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_reset(&ipcp->cfg.peer_list);
if (strpbrk(hisaddr, ",-")) {
iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
iplist_setrandpos(&ipcp->cfg.peer_list);
ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
return 0;
}
ipcp->cfg.peer_range.ipaddr.s_addr = ipcp->peer_ip.s_addr;
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
} else {
log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
return 0;
}
} else if (ParseAddr(ipcp, hisaddr, &ipcp->cfg.peer_range.ipaddr,
&ipcp->cfg.peer_range.mask,
&ipcp->cfg.peer_range.width) != 0) {
ipcp->peer_ip.s_addr = ipcp->cfg.peer_range.ipaddr.s_addr;
if (setaddr && ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr,
ipcp->cfg.peer_range.ipaddr, 0) < 0)
return 0;
} else
return 0;
bundle_AdjustFilters(bundle, NULL, &ipcp->peer_ip);
return 1; /* Ok */
}
struct in_addr
addr2mask(struct in_addr addr)
{
u_int32_t haddr = ntohl(addr.s_addr);
haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
IN_CLASSB(haddr) ? IN_CLASSB_NET :
IN_CLASSC_NET;
addr.s_addr = htonl(haddr);
return addr;
}
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