+int sockaddrcmp(const sockaddr_t *a, const sockaddr_t *b)
+{
+ int result;
+
+ cp();
+
+ result = a->sa.sa_family - b->sa.sa_family;
+
+ if(result)
+ return result;
+
+ switch (a->sa.sa_family) {
+ case AF_UNSPEC:
+ return 0;
+
+ case AF_INET:
+ result = memcmp(&a->in.sin_addr, &b->in.sin_addr, sizeof(a->in.sin_addr));
+
+ if(result)
+ return result;
+
+ return memcmp(&a->in.sin_port, &b->in.sin_port, sizeof(a->in.sin_port));
+
+ case AF_INET6:
+ result = memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr));
+
+ if(result)
+ return result;
+
+ return memcmp(&a->in6.sin6_port, &b->in6.sin6_port, sizeof(a->in6.sin6_port));
+
+ default:
+ logger(LOG_ERR, _("sockaddrcmp() was called with unknown address family %d, exitting!"),
+ a->sa.sa_family);
+ cp_trace();
+ raise(SIGFPE);
+ exit(0);
+ }
+}
+
+void sockaddrunmap(sockaddr_t *sa)
+{
+ if(sa->sa.sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sa->in6.sin6_addr)) {
+ sa->in.sin_addr.s_addr = ((uint32_t *) & sa->in6.sin6_addr)[3];
+ sa->in.sin_family = AF_INET;
+ }
+}
+
+/* Subnet mask handling */
+
+int maskcmp(const void *va, const void *vb, int masklen, int len)
+{
+ int i, m, result;
+ const char *a = va;
+ const char *b = vb;
+
+ cp();
+
+ for(m = masklen, i = 0; m >= 8; m -= 8, i++) {
+ result = a[i] - b[i];
+ if(result)
+ return result;
+ }
+
+ if(m)
+ return (a[i] & (0x100 - (1 << (8 - m)))) -
+ (b[i] & (0x100 - (1 << (8 - m))));
+
+ return 0;
+}
+
+void mask(void *va, int masklen, int len)