tools: retry resolution except when fatal

The reference to this is <https://sourceware.org/glibc/wiki/NameResolver>,
which mentions:

"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."

This should cover more early-boot situations.

While we're at it, we clean up the logic a bit so that we don't have a
retry message on the final non-retrying attempt. We also peer into errno
when receiving EAI_SYSTEM, to report to the user what actually happened.

Also, fix the quoting back tick front tick mess.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/tools/show.c b/src/tools/show.c
index 476d002..4203494 100644
--- a/src/tools/show.c
+++ b/src/tools/show.c
@@ -352,7 +352,7 @@ static bool ugly_print(struct wgdevice *device, const char *param, bool with_int
 	} else if (!strcmp(param, "dump"))
 		dump_print(device, with_interface);
 	else {
-		fprintf(stderr, "Invalid parameter: `%s`\n", param);
+		fprintf(stderr, "Invalid parameter: `%s'\n", param);
 		show_usage();
 		return false;
 	}