+
+#define IADDR_NBUFS_SHIFT 3
+#define IADDR_NBUFS (1 << IADDR_NBUFS_SHIFT)
+
+const char *iaddr_to_string(const union iaddr *ia)
+{
+ static int b;
+
+ b++;
+ b &= IADDR_NBUFS-1;
+
+#ifndef CONFIG_IPV6
+
+ static char bufs[IADDR_NBUFS][100];
+
+ assert(ia->sa.sa_family == AF_INET);
+
+ snprintf(bufs[b], sizeof(bufs[b]), "[%s]:%d",
+ inet_ntoa(ia->sin.sin_addr),
+ ntohs(ia->sin.sin_port));
+
+#else /* CONFIG_IPV6 => we have adns_addr2text */
+
+ static char bufs[IADDR_NBUFS][1+ADNS_ADDR2TEXT_BUFLEN+20];
+
+ int port;
+
+ char *addrbuf = bufs[b];
+ *addrbuf++ = '[';
+ int addrbuflen = ADNS_ADDR2TEXT_BUFLEN;
+
+ int r = adns_addr2text(&ia->sa, 0, addrbuf, &addrbuflen, &port);
+ if (r) {
+ const char fmt[]= "scoped IPv6 addr, error: %.*s";
+ sprintf(addrbuf, fmt,
+ ADNS_ADDR2TEXT_BUFLEN - sizeof(fmt) /* underestimate */,
+ strerror(r));
+ }
+
+ char *portbuf = addrbuf;
+ int addrl = strlen(addrbuf);
+ portbuf += addrl;
+
+ snprintf(portbuf, sizeof(bufs[b])-addrl, "]:%d", port);
+
+#endif /* CONFIG_IPV6 */
+
+ return bufs[b];
+}
+
+bool_t iaddr_equal(const union iaddr *ia, const union iaddr *ib)
+{
+ if (ia->sa.sa_family != ib->sa.sa_family)
+ return 0;
+ switch (ia->sa.sa_family) {
+ case AF_INET:
+ return ia->sin.sin_addr.s_addr == ib->sin.sin_addr.s_addr
+ && ia->sin.sin_port == ib->sin.sin_port;
+#ifdef CONFIG_IPV6
+ case AF_INET6:
+ return !memcmp(&ia->sin6.sin6_addr, &ib->sin6.sin6_addr, 16)
+ && ia->sin6.sin6_scope_id == ib->sin6.sin6_scope_id
+ && ia->sin6.sin6_port == ib->sin6.sin6_port
+ /* we ignore the flowinfo field */;
+#endif /* CONFIG_IPV6 */
+ default:
+ abort();
+ }
+}
+
+int iaddr_socklen(const union iaddr *ia)
+{
+ switch (ia->sa.sa_family) {
+ case AF_INET: return sizeof(ia->sin);
+#ifdef CONFIG_IPV6
+ case AF_INET6: return sizeof(ia->sin6);
+#endif /* CONFIG_IPV6 */
+ default: abort();
+ }
+}