+ /*
+ * 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 1.3 96/05/31 15:52:57";
+#endif
+
+#ifdef TEST
+#undef perror
+#endif
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <string.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()
+{
+ 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()
+{
+ 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(addr)
+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