2 * Check if an address belongs to the local system. Adapted from:
4 * @(#)pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc.
5 * @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC.
9 * Copyright (c) 2009, Sun Microsystems, Inc.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions are met:
14 * - Redistributions of source code must retain the above copyright notice,
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20 * contributors may be used to endorse or promote products derived
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23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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37 static char sccsid[] = "@(#) from_local.c 1.3 96/05/31 15:52:57";
44 #include <sys/types.h>
45 #include <sys/socket.h>
49 #include <netinet/in.h>
51 #include <sys/ioctl.h>
62 * With virtual hosting, each hardware network interface can have multiple
63 * network addresses. On such machines the number of machine addresses can
64 * be surprisingly large.
68 static struct in_addr *addrs;
70 /* grow_addrs - extend list of local interface addresses */
72 static int grow_addrs(void)
74 struct in_addr *new_addrs;
78 * Keep the previous result if we run out of memory. The system would
79 * really get hosed if we simply give up.
81 new_num = (addrs == 0) ? 1 : num_addrs + num_addrs;
82 new_addrs = (struct in_addr *) malloc(sizeof(*addrs) * new_num);
84 perror("portmap: out of memory");
88 memcpy((char *) new_addrs, (char *) addrs,
89 sizeof(*addrs) * num_addrs);
98 /* find_local - find all IP addresses for this host */
105 struct ifreq *the_end;
110 * Get list of network interfaces. We use a huge buffer to allow for the
111 * presence of non-IP interfaces.
114 if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
118 ifc.ifc_len = sizeof(buf);
120 if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) {
121 perror("SIOCGIFCONF");
125 /* Get IP address of each active IP network interface. */
127 the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
129 for (ifr = ifc.ifc_req; ifr < the_end; ifr++) {
130 if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */
132 if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
133 perror("SIOCGIFFLAGS");
134 } else if (ifreq.ifr_flags & IFF_UP) { /* active interface */
135 if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) {
136 perror("SIOCGIFADDR");
138 if (num_local >= num_addrs)
139 if (grow_addrs() == 0)
141 addrs[num_local++] = ((struct sockaddr_in *)
142 & ifreq.ifr_addr)->sin_addr;
146 /* Support for variable-length addresses. */
148 ifr = (struct ifreq *) ((caddr_t) ifr
149 + ifr->ifr_addr.sa_len - sizeof(struct sockaddr));
156 /* from_local - determine whether request comes from the local system */
158 from_local(struct sockaddr_in *addr)
162 if (addrs == 0 && find_local() == 0)
163 syslog(LOG_ERR, "cannot find any active local network interfaces");
165 for (i = 0; i < num_local; i++) {
166 if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]),
167 sizeof(struct in_addr)) == 0)
181 for (i = 0; i < num_local; i++)
182 printf("%s\n", inet_ntoa(addrs[i]));