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NetBSD/usr.sbin/amd/libamu/wire.c

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/* $NetBSD: wire.c,v 1.1.1.2 1997/10/26 00:02:19 christos Exp $ */
/*
* Copyright (c) 1997 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 acknowledgement:
* 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 5.2.2.2 1992/06/07 18:06:46 jsp Exp jsp
*
*/
/*
* 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 retuned, 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(*ifr)
#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))
void
print_wires(char *buf)
{
addrlist *al;
char s[256];
int i;
if (!buf)
return;
if (!localnets) {
sprintf(buf, "No networks.\n");
return;
}
/* 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;
}
i = 1;
for (al = localnets; al; al=al->ip_next) {
sprintf(s,
"Network %d: wire=\"%s\" (netnumber=%s).\n",
i, al->ip_net_name, al->ip_net_num);
strcat(buf, s);
i++;
}
}
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 */
/* 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;
}
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