d5c3a37026
for the local interfaces. It's not uncommon to have >32 interfaces these days. This is a temporary patch until it's fixed to use sysctl or whatever.
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*
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* Check if an address belongs to the local system. Adapted from:
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*
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* @(#)pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc.
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* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC.
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*/
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user or with the express written consent of
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* Sun Microsystems, Inc.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#ifndef lint
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static char sccsid[] = "@(#) from_local.c 1.2 93/11/16 21:50:02";
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#endif
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#ifdef TEST
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#undef perror
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#endif
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netdb.h>
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#include <syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#ifndef TRUE
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#define TRUE 1
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#define FALSE 0
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#endif
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/* How many interfaces could there be on a computer? */
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#define MAX_LOCAL 256 /* overkill */
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static int num_local = -1;
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static struct in_addr addrs[MAX_LOCAL];
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/* find_local - find all IP addresses for this host */
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find_local()
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{
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struct ifconf ifc;
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struct ifreq ifreq;
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struct ifreq *ifr;
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struct ifreq *the_end;
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int sock;
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char buf[MAX_LOCAL * sizeof(struct ifreq)];
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/* Get list of network interfaces. */
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if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
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perror("socket");
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return (0);
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}
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ifc.ifc_len = sizeof(buf);
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ifc.ifc_buf = buf;
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if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) {
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perror("SIOCGIFCONF");
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(void) close(sock);
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return (0);
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}
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/* Get IP address of each active IP network interface. */
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the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
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num_local = 0;
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for (ifr = ifc.ifc_req; ifr < the_end; ifr++) {
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if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */
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ifreq = *ifr;
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if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
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perror("SIOCGIFFLAGS");
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} else if (ifreq.ifr_flags & IFF_UP) { /* active interface */
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if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) {
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perror("SIOCGIFADDR");
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} else {
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addrs[num_local++] = ((struct sockaddr_in *)
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& ifreq.ifr_addr)->sin_addr;
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}
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}
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}
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if (num_local >= MAX_LOCAL)
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break;
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/* Support for variable-length addresses. */
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ifr = (struct ifreq *) ((caddr_t) ifr
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+ ifr->ifr_addr.sa_len - sizeof(struct sockaddr));
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}
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(void) close(sock);
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return (num_local);
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}
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/* from_local - determine whether request comes from the local system */
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from_local(addr)
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struct sockaddr_in *addr;
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{
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int i;
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if (num_local == -1 && find_local() == 0)
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syslog(LOG_ERR, "cannot find any active local network interfaces");
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for (i = 0; i < num_local; i++) {
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if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]),
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sizeof(struct in_addr)) == 0)
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return (TRUE);
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}
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return (FALSE);
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}
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#ifdef TEST
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main()
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{
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char *inet_ntoa();
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int i;
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find_local();
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for (i = 0; i < num_local; i++)
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printf("%s\n", inet_ntoa(addrs[i]));
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}
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#endif
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