sa: add support for interface suffix for IPv6ll

src/sa/sa.c

@@ -12,6 +12,9 @@
 #include <arpa/inet.h>
 #endif
 #include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
 #include <re_types.h>
 #include <re_fmt.h>
 #include <re_list.h>
@@ -68,7 +71,11 @@ int sa_set(struct sa *sa, const struct pl *addr, uint16_t port)
  */
 int sa_pton(const char *addr, struct sa *sa)
 {
-	if (!addr)
+	struct addrinfo *res, *res0 = NULL;
+	struct addrinfo hints;
+	int err = 0;
+
+	if (!addr || !sa)
 		return EINVAL;
 
 	if (inet_pton(AF_INET, addr, &sa->u.in.sin_addr) > 0) {
@@ -86,12 +93,31 @@ int sa_pton(const char *addr, struct sa *sa)
 			sa->u.in6.sin6_family = AF_INET6;
 		}
 	}
+	else if (!strncmp(addr, "fe80:", 5) && strchr(addr, '%')) {
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_flags  = AI_V4MAPPED | AI_ADDRCONFIG | AI_NUMERICHOST;
+
+		if (getaddrinfo(addr, NULL, &hints, &res0))
+			return EADDRNOTAVAIL;
+
+		for (res = res0; res; res = res->ai_next) {
+
+			err = sa_set_sa(sa, res->ai_addr);
+			if (err)
+				continue;
+
+			break;
+		}
+
+		freeaddrinfo(res0);
+	}
 #endif
 	else {
 		return EINVAL;
 	}
 
-	return 0;
+	return err;
 }