gethostname.c.patch   [plain text]

--- gethostname.c.orig	2004-11-25 11:38:01.000000000 -0800
+++ gethostname.c	2005-09-15 09:46:13.000000000 -0700
@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD: src/lib/libc/gen/get
 
 #include <sys/param.h>
 #include <sys/sysctl.h>
+#include <limits.h>
 
 #include <errno.h>
 
@@ -54,10 +55,22 @@ gethostname(name, namelen)
 
 	mib[0] = CTL_KERN;
 	mib[1] = KERN_HOSTNAME;
+	if (namelen < MAXHOSTNAMELEN + 1) {
+		char local_buf[MAXHOSTNAMELEN + 1];
+		size_t local_len = sizeof(local_buf);
+		if (sysctl(mib, 2, local_buf, &local_len, NULL, 0) == -1) {
+			if (errno == ENOMEM)
+				errno = ENAMETOOLONG;
+			return (-1);
+		}
+		strncpy(name, local_buf, namelen);
+		name[namelen - 1] = 0;
+	} else {
 	if (sysctl(mib, 2, name, &namelen, NULL, 0) == -1) {
 		if (errno == ENOMEM)
 			errno = ENAMETOOLONG;
 		return (-1);
+		}
 	}
 	return (0);
 }