407 lines
11 KiB
C
407 lines
11 KiB
C
/* $NetBSD: wire.c,v 1.1.1.4 1999/02/01 18:45:46 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1997-1999 Erez Zadok
|
|
* Copyright (c) 1990 Jan-Simon Pendry
|
|
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Jan-Simon Pendry at Imperial College, London.
|
|
*
|
|
* 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 acknowledgment:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley 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.
|
|
*
|
|
* %W% (Berkeley) %G%
|
|
*
|
|
* Id: wire.c,v 1.2 1999/01/10 21:54:39 ezk Exp
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This function returns the subnet (address&netmask) for the primary network
|
|
* interface. If the resulting address has an entry in the hosts file, the
|
|
* corresponding name is returned, otherwise the address is returned in
|
|
* standard internet format.
|
|
* As a side-effect, a list of local IP/net address is recorded for use
|
|
* by the islocalnet() function.
|
|
*
|
|
* Derived from original by Paul Anderson (23/4/90)
|
|
* Updates from Dirk Grunwald (11/11/91)
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif /* HAVE_CONFIG_H */
|
|
#include <am_defs.h>
|
|
#include <amu.h>
|
|
|
|
|
|
/*
|
|
* List of locally connected networks
|
|
*/
|
|
typedef struct addrlist addrlist;
|
|
struct addrlist {
|
|
addrlist *ip_next;
|
|
u_long ip_addr; /* address of network */
|
|
u_long ip_mask;
|
|
char *ip_net_num; /* number of network */
|
|
char *ip_net_name; /* name of network */
|
|
};
|
|
static addrlist *localnets = NULL;
|
|
|
|
#if defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK)
|
|
# define IFF_LOOPBACK IFF_LOCAL_LOOPBACK
|
|
#endif /* defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK) */
|
|
|
|
#if defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN)
|
|
# define SIZE(ifr) (MAX((ifr)->ifr_addr.sa_len, sizeof((ifr)->ifr_addr)) + sizeof(ifr->ifr_name))
|
|
#else /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */
|
|
# define SIZE(ifr) sizeof(struct ifreq)
|
|
#endif /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */
|
|
|
|
#define C(x) ((x) & 0xff)
|
|
#define GFBUFLEN 1024
|
|
#define clist (ifc.ifc_ifcu.ifcu_req)
|
|
#define count (ifc.ifc_len/sizeof(struct ifreq))
|
|
|
|
|
|
/* return malloc'ed buffer. caller must free it */
|
|
char *
|
|
print_wires(void)
|
|
{
|
|
addrlist *al;
|
|
char s[256];
|
|
int i;
|
|
char *buf;
|
|
int bufcount = 0;
|
|
int buf_size = 1024;
|
|
|
|
buf = malloc(1024);
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
if (!localnets) {
|
|
sprintf(buf, "No networks.\n");
|
|
return buf;
|
|
}
|
|
/* check if there's more than one network */
|
|
if (!localnets->ip_next) {
|
|
sprintf(buf,
|
|
"Network: wire=\"%s\" (netnumber=%s).\n",
|
|
localnets->ip_net_name, localnets->ip_net_num);
|
|
return buf;
|
|
}
|
|
buf[0] = '\0'; /* null out buffer before appending */
|
|
for (i = 1, al = localnets; al; al = al->ip_next, i++) {
|
|
sprintf(s, "Network %d: wire=\"%s\" (netnumber=%s).\n",
|
|
i, al->ip_net_name, al->ip_net_num);
|
|
bufcount += strlen(s);
|
|
if (bufcount > buf_size) {
|
|
buf_size *= 2;
|
|
buf = xrealloc(buf, buf_size);
|
|
}
|
|
strcat(buf, s);
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
|
|
void
|
|
getwire(char **name1, char **number1)
|
|
{
|
|
struct hostent *hp;
|
|
struct netent *np;
|
|
struct ifconf ifc;
|
|
struct ifreq *ifr;
|
|
caddr_t cp, cplim;
|
|
u_long address, netmask, subnet;
|
|
char buf[GFBUFLEN], *s;
|
|
int fd = -1;
|
|
u_long net;
|
|
u_long mask;
|
|
u_long subnetshift;
|
|
char netNumberBuf[64];
|
|
addrlist *al = NULL, *tail = NULL;
|
|
|
|
#ifndef SIOCGIFFLAGS
|
|
/* if cannot get interface flags, return nothing */
|
|
plog(XLOG_ERROR, "getwire unable to get interface flags");
|
|
localnets = NULL;
|
|
return;
|
|
#endif /* not SIOCGIFFLAGS */
|
|
|
|
/*
|
|
* Get suitable socket
|
|
*/
|
|
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Fill in ifconf details
|
|
*/
|
|
memset(&buf[0], 0, GFBUFLEN);
|
|
ifc.ifc_len = sizeof(buf);
|
|
ifc.ifc_buf = buf;
|
|
|
|
/*
|
|
* Get network interface configurations
|
|
*/
|
|
if (ioctl(fd, SIOCGIFCONF, (caddr_t) & ifc) < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Upper bound on array
|
|
*/
|
|
cplim = buf + ifc.ifc_len;
|
|
|
|
/*
|
|
* This is some magic to cope with both "traditional" and the
|
|
* new 4.4BSD-style struct sockaddrs. The new structure has
|
|
* variable length and a size field to support longer addresses.
|
|
* AF_LINK is a new definition for 4.4BSD.
|
|
*/
|
|
|
|
/*
|
|
* Scan the list looking for a suitable interface
|
|
*/
|
|
for (cp = buf; cp < cplim; cp += SIZE(ifr)) {
|
|
ifr = (struct ifreq *) cp;
|
|
|
|
if (ifr->ifr_addr.sa_family != AF_INET)
|
|
continue;
|
|
else
|
|
address = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
|
|
|
|
/*
|
|
* Get interface flags
|
|
*/
|
|
if (ioctl(fd, SIOCGIFFLAGS, (caddr_t) ifr) < 0)
|
|
continue;
|
|
|
|
/*
|
|
* If the interface is a loopback, or its not running
|
|
* then ignore it.
|
|
*/
|
|
#ifdef IFF_LOOPBACK
|
|
if ((ifr->ifr_flags & IFF_LOOPBACK) != 0)
|
|
continue;
|
|
#endif /* IFF_LOOPBACK */
|
|
/*
|
|
* Fix for 0.0.0.0 loopback on SunOS 3.X which defines IFF_ROUTE
|
|
* instead of IFF_LOOPBACK.
|
|
*/
|
|
#ifdef IFF_ROUTE
|
|
if (ifr->ifr_flags == (IFF_UP|IFF_RUNNING))
|
|
continue;
|
|
#endif /* IFF_ROUTE */
|
|
|
|
/* if the interface is not UP or not RUNNING, skip it */
|
|
if ((ifr->ifr_flags & IFF_RUNNING) == 0 ||
|
|
(ifr->ifr_flags & IFF_UP) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Get the netmask of this interface
|
|
*/
|
|
if (ioctl(fd, SIOCGIFNETMASK, (caddr_t) ifr) < 0)
|
|
continue;
|
|
|
|
netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
|
|
|
|
/*
|
|
* Add interface to local network singly linked list
|
|
*/
|
|
al = ALLOC(struct addrlist);
|
|
al->ip_addr = address;
|
|
al->ip_mask = netmask;
|
|
al->ip_net_name = NO_SUBNET; /* fill in a bit later */
|
|
al->ip_net_num = "0.0.0.0"; /* fill in a bit later */
|
|
al->ip_next = NULL;
|
|
/* append to the end of the list */
|
|
if (!localnets) {
|
|
localnets = tail = al;
|
|
tail->ip_next = NULL;
|
|
} else {
|
|
tail->ip_next = al;
|
|
tail = al;
|
|
}
|
|
|
|
/*
|
|
* Figure out the subnet's network address
|
|
*/
|
|
subnet = address & netmask;
|
|
|
|
#ifdef IN_CLASSA
|
|
subnet = htonl(subnet);
|
|
|
|
if (IN_CLASSA(subnet)) {
|
|
mask = IN_CLASSA_NET;
|
|
subnetshift = 8;
|
|
} else if (IN_CLASSB(subnet)) {
|
|
mask = IN_CLASSB_NET;
|
|
subnetshift = 8;
|
|
} else {
|
|
mask = IN_CLASSC_NET;
|
|
subnetshift = 4;
|
|
}
|
|
|
|
/*
|
|
* If there are more bits than the standard mask
|
|
* would suggest, subnets must be in use.
|
|
* Guess at the subnet mask, assuming reasonable
|
|
* width subnet fields.
|
|
* XXX: Or-in at least 1 byte's worth of 1s to make
|
|
* sure the top bits remain set.
|
|
*/
|
|
while (subnet & ~mask)
|
|
mask = (mask >> subnetshift) | 0xff000000;
|
|
|
|
net = subnet & mask;
|
|
while ((mask & 1) == 0)
|
|
mask >>= 1, net >>= 1;
|
|
|
|
/*
|
|
* Now get a usable name.
|
|
* First use the network database,
|
|
* then the host database,
|
|
* and finally just make a dotted quad.
|
|
*/
|
|
np = getnetbyaddr(net, AF_INET);
|
|
|
|
/* the network address has been masked off */
|
|
if ((subnet & 0xffffff) == 0) {
|
|
sprintf(netNumberBuf, "%lu", C(subnet >> 24));
|
|
} else if ((subnet & 0xffff) == 0) {
|
|
sprintf(netNumberBuf, "%lu.%lu",
|
|
C(subnet >> 24), C(subnet >> 16));
|
|
} else if ((subnet & 0xff) == 0) {
|
|
sprintf(netNumberBuf, "%lu.%lu.%lu",
|
|
C(subnet >> 24), C(subnet >> 16),
|
|
C(subnet >> 8));
|
|
} else {
|
|
sprintf(netNumberBuf, "%lu.%lu.%lu.%lu",
|
|
C(subnet >> 24), C(subnet >> 16),
|
|
C(subnet >> 8), C(subnet));
|
|
}
|
|
|
|
/* fill in network number (string) */
|
|
al->ip_net_num = strdup(netNumberBuf);
|
|
|
|
#else /* not IN_CLASSA */
|
|
/* This is probably very wrong. */
|
|
np = getnetbyaddr(subnet, AF_INET);
|
|
#endif /* not IN_CLASSA */
|
|
|
|
if (np)
|
|
s = np->n_name;
|
|
else {
|
|
subnet = address & netmask;
|
|
hp = gethostbyaddr((char *) &subnet, 4, AF_INET);
|
|
if (hp)
|
|
s = (char *) hp->h_name;
|
|
else
|
|
s = inet_dquad(buf, subnet);
|
|
}
|
|
|
|
/* fill in network name (string) */
|
|
al->ip_net_name = strdup(s);
|
|
}
|
|
|
|
out:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
if (localnets) {
|
|
*name1 = localnets->ip_net_name;
|
|
*number1 = localnets->ip_net_num;
|
|
} else {
|
|
*name1 = NO_SUBNET;
|
|
*number1 = "0.0.0.0";
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Make a dotted quad from a 32bit IP address
|
|
* addr is in network byte order.
|
|
* sizeof(buf) needs to be at least 16.
|
|
*/
|
|
char *
|
|
inet_dquad(char *buf, u_long addr)
|
|
{
|
|
addr = ntohl(addr);
|
|
sprintf(buf, "%ld.%ld.%ld.%ld",
|
|
((addr >> 24) & 0xff),
|
|
((addr >> 16) & 0xff),
|
|
((addr >> 8) & 0xff),
|
|
((addr >> 0) & 0xff));
|
|
return buf;
|
|
}
|
|
|
|
|
|
/*
|
|
* Determine whether a network is on a local network
|
|
* (addr) is in network byte order.
|
|
*/
|
|
int
|
|
islocalnet(u_long addr)
|
|
{
|
|
addrlist *al;
|
|
#ifdef DEBUG
|
|
char buf[16];
|
|
#endif /* DEBUG */
|
|
|
|
for (al = localnets; al; al = al->ip_next)
|
|
if (((addr ^ al->ip_addr) & al->ip_mask) == 0)
|
|
return TRUE;
|
|
|
|
#ifdef DEBUG
|
|
plog(XLOG_INFO, "%s is on a remote network", inet_dquad(buf, addr));
|
|
#endif /* DEBUG */
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/*
|
|
* Determine whether a network name is one of the local networks
|
|
* of a host.
|
|
*/
|
|
int
|
|
is_network_member(const char *net)
|
|
{
|
|
addrlist *al;
|
|
|
|
for (al = localnets; al; al = al->ip_next)
|
|
if (STREQ(net, al->ip_net_name) || STREQ(net, al->ip_net_num))
|
|
return TRUE;
|
|
|
|
return FALSE;
|
|
}
|