405 lines
11 KiB
C
405 lines
11 KiB
C
/*
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* Copyright (c) 1997-1998 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* %W% (Berkeley) %G%
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*
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* $Id: wire.c,v 5.2.2.2 1992/06/07 18:06:46 jsp Exp jsp $
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*
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*/
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/*
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* This function returns the subnet (address&netmask) for the primary network
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* interface. If the resulting address has an entry in the hosts file, the
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* corresponding name is retuned, otherwise the address is returned in
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* standard internet format.
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* As a side-effect, a list of local IP/net address is recorded for use
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* by the islocalnet() function.
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*
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* Derived from original by Paul Anderson (23/4/90)
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* Updates from Dirk Grunwald (11/11/91)
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amu.h>
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/*
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* List of locally connected networks
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*/
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typedef struct addrlist addrlist;
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struct addrlist {
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addrlist *ip_next;
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u_long ip_addr; /* address of network */
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u_long ip_mask;
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char *ip_net_num; /* number of network */
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char *ip_net_name; /* name of network */
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};
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static addrlist *localnets = NULL;
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#if defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK)
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# define IFF_LOOPBACK IFF_LOCAL_LOOPBACK
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#endif /* defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK) */
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#if defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN)
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# define SIZE(ifr) (MAX((ifr)->ifr_addr.sa_len, sizeof((ifr)->ifr_addr)) + sizeof(ifr->ifr_name))
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#else /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */
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# define SIZE(ifr) sizeof(struct ifreq)
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#endif /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */
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#define C(x) ((x) & 0xff)
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#define GFBUFLEN 1024
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#define clist (ifc.ifc_ifcu.ifcu_req)
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#define count (ifc.ifc_len/sizeof(struct ifreq))
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/* return malloc'ed buffer. caller must free it */
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char *
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print_wires(void)
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{
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addrlist *al;
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char s[256];
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int i;
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char *buf;
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int bufcount = 0;
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int buf_size = 1024;
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buf = malloc(1024);
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if (!buf)
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return NULL;
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if (!localnets) {
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sprintf(buf, "No networks.\n");
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return buf;
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}
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/* check if there's more than one network */
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if (!localnets->ip_next) {
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sprintf(buf,
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"Network: wire=\"%s\" (netnumber=%s).\n",
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localnets->ip_net_name, localnets->ip_net_num);
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return buf;
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}
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buf[0] = '\0'; /* null out buffer before appending */
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for (i = 1, al = localnets; al; al = al->ip_next, i++) {
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sprintf(s, "Network %d: wire=\"%s\" (netnumber=%s).\n",
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i, al->ip_net_name, al->ip_net_num);
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bufcount += strlen(s);
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if (bufcount > buf_size) {
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buf_size *= 2;
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buf = xrealloc(buf, buf_size);
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}
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strcat(buf, s);
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}
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return buf;
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}
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void
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getwire(char **name1, char **number1)
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{
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struct hostent *hp;
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struct netent *np;
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struct ifconf ifc;
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struct ifreq *ifr;
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caddr_t cp, cplim;
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u_long address, netmask, subnet;
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char buf[GFBUFLEN], *s;
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int fd = -1;
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u_long net;
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u_long mask;
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u_long subnetshift;
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char netNumberBuf[64];
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addrlist *al = NULL, *tail = NULL;
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#ifndef SIOCGIFFLAGS
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/* if cannot get interface flags, return nothing */
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plog(XLOG_ERROR, "getwire unable to get interface flags");
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localnets = NULL;
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return;
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#endif /* not SIOCGIFFLAGS */
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/*
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* Get suitable socket
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*/
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
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goto out;
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/*
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* Fill in ifconf details
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*/
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memset(&buf[0], 0, GFBUFLEN);
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ifc.ifc_len = sizeof(buf);
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ifc.ifc_buf = buf;
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/*
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* Get network interface configurations
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*/
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if (ioctl(fd, SIOCGIFCONF, (caddr_t) & ifc) < 0)
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goto out;
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/*
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* Upper bound on array
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*/
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cplim = buf + ifc.ifc_len;
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/*
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* This is some magic to cope with both "traditional" and the
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* new 4.4BSD-style struct sockaddrs. The new structure has
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* variable length and a size field to support longer addresses.
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* AF_LINK is a new definition for 4.4BSD.
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*/
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/*
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* Scan the list looking for a suitable interface
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*/
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for (cp = buf; cp < cplim; cp += SIZE(ifr)) {
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ifr = (struct ifreq *) cp;
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if (ifr->ifr_addr.sa_family != AF_INET)
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continue;
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else
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address = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
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/*
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* Get interface flags
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*/
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if (ioctl(fd, SIOCGIFFLAGS, (caddr_t) ifr) < 0)
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continue;
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/*
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* If the interface is a loopback, or its not running
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* then ignore it.
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*/
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#ifdef IFF_LOOPBACK
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if ((ifr->ifr_flags & IFF_LOOPBACK) != 0)
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continue;
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#endif /* IFF_LOOPBACK */
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/*
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* Fix for 0.0.0.0 loopback on SunOS 3.X which defines IFF_ROUTE
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* instead of IFF_LOOPBACK.
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*/
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#ifdef IFF_ROUTE
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if (ifr->ifr_flags == (IFF_UP|IFF_RUNNING))
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continue;
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#endif /* IFF_ROUTE */
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/* if the interface is not UP or not RUNNING, skip it */
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if ((ifr->ifr_flags & IFF_RUNNING) == 0 ||
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(ifr->ifr_flags & IFF_UP) == 0)
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continue;
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/*
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* Get the netmask of this interface
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*/
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if (ioctl(fd, SIOCGIFNETMASK, (caddr_t) ifr) < 0)
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continue;
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netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
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/*
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* Add interface to local network singly linked list
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*/
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al = ALLOC(struct addrlist);
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al->ip_addr = address;
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al->ip_mask = netmask;
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al->ip_net_name = NO_SUBNET; /* fill in a bit later */
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al->ip_net_num = "0.0.0.0"; /* fill in a bit later */
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al->ip_next = NULL;
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/* append to the end of the list */
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if (!localnets) {
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localnets = tail = al;
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tail->ip_next = NULL;
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} else {
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tail->ip_next = al;
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tail = al;
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}
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/*
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* Figure out the subnet's network address
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*/
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subnet = address & netmask;
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#ifdef IN_CLASSA
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subnet = htonl(subnet);
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if (IN_CLASSA(subnet)) {
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mask = IN_CLASSA_NET;
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subnetshift = 8;
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} else if (IN_CLASSB(subnet)) {
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mask = IN_CLASSB_NET;
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subnetshift = 8;
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} else {
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mask = IN_CLASSC_NET;
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subnetshift = 4;
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}
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/*
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* If there are more bits than the standard mask
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* would suggest, subnets must be in use.
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* Guess at the subnet mask, assuming reasonable
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* width subnet fields.
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* XXX: Or-in at least 1 byte's worth of 1s to make
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* sure the top bits remain set.
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*/
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while (subnet & ~mask)
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mask = (mask >> subnetshift) | 0xff000000;
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net = subnet & mask;
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while ((mask & 1) == 0)
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mask >>= 1, net >>= 1;
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/*
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* Now get a usable name.
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* First use the network database,
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* then the host database,
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* and finally just make a dotted quad.
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*/
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np = getnetbyaddr(net, AF_INET);
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/* the network address has been masked off */
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if ((subnet & 0xffffff) == 0) {
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sprintf(netNumberBuf, "%lu", C(subnet >> 24));
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} else if ((subnet & 0xffff) == 0) {
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sprintf(netNumberBuf, "%lu.%lu",
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C(subnet >> 24), C(subnet >> 16));
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} else if ((subnet & 0xff) == 0) {
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sprintf(netNumberBuf, "%lu.%lu.%lu",
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C(subnet >> 24), C(subnet >> 16),
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C(subnet >> 8));
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} else {
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sprintf(netNumberBuf, "%lu.%lu.%lu.%lu",
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C(subnet >> 24), C(subnet >> 16),
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C(subnet >> 8), C(subnet));
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}
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/* fill in network number (string) */
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al->ip_net_num = strdup(netNumberBuf);
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#else /* not IN_CLASSA */
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/* This is probably very wrong. */
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np = getnetbyaddr(subnet, AF_INET);
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#endif /* not IN_CLASSA */
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if (np)
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s = np->n_name;
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else {
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subnet = address & netmask;
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hp = gethostbyaddr((char *) &subnet, 4, AF_INET);
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if (hp)
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s = (char *) hp->h_name;
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else
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s = inet_dquad(buf, subnet);
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}
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/* fill in network name (string) */
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al->ip_net_name = strdup(s);
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}
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out:
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if (fd >= 0)
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close(fd);
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if (localnets) {
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*name1 = localnets->ip_net_name;
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*number1 = localnets->ip_net_num;
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} else {
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*name1 = NO_SUBNET;
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*number1 = "0.0.0.0";
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}
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}
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/*
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* Make a dotted quad from a 32bit IP address
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* addr is in network byte order.
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* sizeof(buf) needs to be at least 16.
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*/
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char *
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inet_dquad(char *buf, u_long addr)
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{
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addr = ntohl(addr);
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sprintf(buf, "%ld.%ld.%ld.%ld",
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((addr >> 24) & 0xff),
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((addr >> 16) & 0xff),
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((addr >> 8) & 0xff),
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((addr >> 0) & 0xff));
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return buf;
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}
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/*
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* Determine whether a network is on a local network
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* (addr) is in network byte order.
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*/
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int
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islocalnet(u_long addr)
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{
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addrlist *al;
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#ifdef DEBUG
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char buf[16];
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#endif /* DEBUG */
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for (al = localnets; al; al = al->ip_next)
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if (((addr ^ al->ip_addr) & al->ip_mask) == 0)
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return TRUE;
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#ifdef DEBUG
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plog(XLOG_INFO, "%s is on a remote network", inet_dquad(buf, addr));
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#endif /* DEBUG */
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return FALSE;
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}
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/*
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* Determine whether a network name is one of the local networks
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* of a host.
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*/
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int
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is_network_member(const char *net)
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{
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addrlist *al;
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for (al = localnets; al; al = al->ip_next)
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if (STREQ(net, al->ip_net_name) || STREQ(net, al->ip_net_num))
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return TRUE;
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return FALSE;
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}
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