From: Egor <egor@patchysicp.xyz>
Date: Thu, 22 Jan 2026 15:02:40 +0000 (+0200)
Subject: main: ensure hostname is FQDN
X-Git-Url: https://git.patchysicp.xyz/?a=commitdiff_plain;h=8746e5d7befb3d8496f32c6370c37c37992d21fc;p=patchyircd.git

main: ensure hostname is FQDN
---

diff --git a/src/main.cpp b/src/main.cpp
index 91532fa..06ab55c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -169,14 +169,24 @@ static void accept_from_sock(struct listener *listener)
 
 static void determine_hostname(void)
 {
-	static char buf[256];
+	static char buf[257];
 	if (!hostname) {
 		if (gethostname(buf, 255) == -1) {
 			perror("gethostname");
-			hostname = "localhost";
+			hostname = "localhost.";
 		} else {
+			// ensure the hostname is FQDN
+			if (!strchr(buf, '.')) {
+				size_t len = strlen(buf);
+				buf[len] = '.';
+				buf[len+1] = '\0';
+			}
 			hostname = buf;
 		}
+	} else {
+		if (!strchr(hostname, '.')) {
+			abortf("Hostname must be FQDN.\n(If necessary, put a period at the end, like so: --hostname '%s.')\n", hostname);
+		}
 	}
 }