wg: FreeBSD doesn't have EAI_NODATA

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/src/config.c b/src/config.c
index 93c39fa..b07aa46 100644
--- a/src/config.c
+++ b/src/config.c
@@ -224,8 +224,21 @@ static inline bool parse_endpoint(struct sockaddr *endpoint, const char *value)
 		if (!ret)
 			break;
 		timeout = timeout * 3 / 2;
-		/* The set of return codes that are "permanent failures". All other possibilities are potentially transient. */
-		if (ret == EAI_NONAME || ret == EAI_FAIL || ret == EAI_NODATA || timeout >= 90000000) {
+		/* The set of return codes that are "permanent failures". All other possibilities are potentially transient.
+		 *
+		 * This is according to https://sourceware.org/glibc/wiki/NameResolver which states:
+		 *	"From the perspective of the application that calls getaddrinfo() it perhaps
+		 *	 doesn't matter that much since EAI_FAIL, EAI_NONAME and EAI_NODATA are all
+		 *	 permanent failure codes and the causes are all permanent failures in the
+		 *	 sense that there is no point in retrying later."
+		 *
+		 * So this is what we do, except FreeBSD removed EAI_NODATA some time ago, so that's conditional.
+		 */
+		if (ret == EAI_NONAME || ret == EAI_FAIL ||
+			#ifdef EAI_NODATA
+				ret == EAI_NODATA ||
+			#endif
+				timeout >= 90000000) {
 			free(mutable);
 			fprintf(stderr, "%s: `%s'\n", ret == EAI_SYSTEM ? strerror(errno) : gai_strerror(ret), value);
 			return false;