mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
|
|
* unrestricted use provided that this legend is included on all tape
|
|
* media and as a part of the software program in whole or part. Users
|
|
* may copy or modify Sun RPC without charge, but are not authorized
|
|
* to license or distribute it to anyone else except as part of a product or
|
|
* program developed by the user or with the express written consent of
|
|
* Sun Microsystems, Inc.
|
|
*
|
|
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
|
|
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
|
|
*
|
|
* Sun RPC is provided with no support and without any obligation on the
|
|
* part of Sun Microsystems, Inc. to assist in its use, correction,
|
|
* modification or enhancement.
|
|
*
|
|
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
|
|
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
|
|
* OR ANY PART THEREOF.
|
|
*
|
|
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
|
|
* or profits or other special, indirect and consequential damages, even if
|
|
* Sun has been advised of the possibility of such damages.
|
|
*
|
|
* Sun Microsystems, Inc.
|
|
* 2550 Garcia Avenue
|
|
* Mountain View, California 94043
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#) from_local.c 1.2 93/11/16 21:50:02";
|
|
#endif
|
|
|
|
#ifdef TEST
|
|
#undef perror
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <netinet/in.h>
|
|
#include <net/if.h>
|
|
#include <sys/ioctl.h>
|
|
#include <syslog.h>
|
|
|
|
#ifndef TRUE
|
|
#define TRUE 1
|
|
#define FALSE 0
|
|
#endif
|
|
|
|
/* How many interfaces could there be on a computer? */
|
|
|
|
#define MAX_LOCAL 16
|
|
static int num_local = -1;
|
|
static struct in_addr addrs[MAX_LOCAL];
|
|
|
|
/* find_local - find all IP addresses for this host */
|
|
|
|
find_local()
|
|
{
|
|
struct ifconf ifc;
|
|
struct ifreq ifreq;
|
|
struct ifreq *ifr;
|
|
struct ifreq *the_end;
|
|
int sock;
|
|
char buf[MAX_LOCAL * sizeof(struct ifreq)];
|
|
|
|
/* Get list of network 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 {
|
|
addrs[num_local++] = ((struct sockaddr_in *)
|
|
& ifreq.ifr_addr)->sin_addr;
|
|
}
|
|
}
|
|
}
|
|
if (num_local >= MAX_LOCAL)
|
|
break;
|
|
/* Support for variable-length addresses. */
|
|
ifr = (struct ifreq *) ((caddr_t) ifr
|
|
+ ifr->ifr_addr.sa_len - sizeof(struct sockaddr));
|
|
}
|
|
(void) close(sock);
|
|
return (num_local);
|
|
}
|
|
|
|
/* from_local - determine whether request comes from the local system */
|
|
|
|
from_local(addr)
|
|
struct sockaddr_in *addr;
|
|
{
|
|
int i;
|
|
|
|
if (num_local == -1 && 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
|