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/*
* Check if an address belongs to the local system. Adapted from:
*
* pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc.
* get_myaddress.c 2.1 88/07/29 4.0 RPCSRC.
*/
/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - 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.
* - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
/*
* With virtual hosting, each hardware network interface can have multiple
* network addresses. On such machines the number of machine addresses can
* be surprisingly large.
*/
static int num_local;
static int num_addrs;
static struct in_addr *addrs;
/* grow_addrs - extend list of local interface addresses */
static int grow_addrs(void)
{
struct in_addr *new_addrs;
int new_num;
/*
* Keep the previous result if we run out of memory. The system would
* really get hosed if we simply give up.
*/
new_num = (addrs == 0) ? 1 : num_addrs + num_addrs;
new_addrs = (struct in_addr *) malloc(sizeof(*addrs) * new_num);
if (new_addrs == 0) {
perror("portmap: out of memory");
return (0);
} else {
if (addrs != 0) {
memcpy((char *) new_addrs, (char *) addrs,
sizeof(*addrs) * num_addrs);
free((char *) addrs);
}
num_addrs = new_num;
addrs = new_addrs;
return (1);
}
}
/* find_local - find all IP addresses for this host */
static int
find_local(void)
{
struct ifconf ifc;
struct ifreq ifreq;
struct ifreq *ifr;
struct ifreq *the_end;
int sock;
char buf[BUFSIZ];
/*
* Get list of network interfaces. We use a huge buffer to allow for the
* presence of non-IP interfaces.
*/
if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return (0);
}
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) {
perror("SIOCGIFCONF");
(void) close(sock);
return (0);
}
/* Get IP address of each active IP network interface. */
the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
num_local = 0;
for (ifr = ifc.ifc_req; ifr < the_end; ifr++) {
if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */
ifreq = *ifr;
if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
perror("SIOCGIFFLAGS");
} else if (ifreq.ifr_flags & IFF_UP) { /* active interface */
if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) {
perror("SIOCGIFADDR");
} else {
if (num_local >= num_addrs)
if (grow_addrs() == 0)
break;
addrs[num_local++] = ((struct sockaddr_in *)
& ifreq.ifr_addr)->sin_addr;
}
}
}
/* Support for variable-length addresses. */
#ifdef HAS_SA_LEN
ifr = (struct ifreq *) ((caddr_t) ifr
+ ifr->ifr_addr.sa_len - sizeof(struct sockaddr));
#endif
}
(void) close(sock);
return (num_local);
}
/* from_local - determine whether request comes from the local system */
int from_local(struct sockaddr_in *addr)
{
int i;
if (addrs == 0 && find_local() == 0)
syslog(LOG_ERR, "cannot find any active local network interfaces");
for (i = 0; i < num_local; i++) {
if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]),
sizeof(struct in_addr)) == 0)
return (TRUE);
}
return (FALSE);
}
#ifdef TEST
main()
{
char *inet_ntoa();
int i;
find_local();
for (i = 0; i < num_local; i++)
printf("%s\n", inet_ntoa(addrs[i]));
}
#endif
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