1 files changed, 102 insertions, 0 deletions
diff --git a/networking/hostname.c b/networking/hostname.c
new file mode 100644
index 000000000..4fe28d740
--- /dev/null
+++ b/networking/hostname.c
@@ -0,0 +1,102 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * $Id: hostname.c,v 1.36 2003/07/14 21:21:01 andersen Exp $
+ * Mini hostname implementation for busybox
+ *
+ * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
+ *
+ * adjusted by Erik Andersen <andersen@codepoet.org> to remove
+ * use of long options and GNU getopt.  Improved the usage info.
+ *
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+
+static void do_sethostname(char *s, int isfile)
+{
+	FILE *f;
+	char buf[256];
+
+	if (!s)
+		return;
+	if (!isfile) {
+		if (sethostname(s, strlen(s)) < 0) {
+			if (errno == EPERM)
+				bb_error_msg_and_die("you must be root to change the hostname");
+			else
+				bb_perror_msg_and_die("sethostname");
+		}
+	} else {
+		f = xfopen(s, "r");
+		while (fgets(buf, sizeof(buf), f) != NULL) {
+			if (buf[0] =='#') {
+				continue;
+			}
+			chomp(buf);
+			do_sethostname(buf, 0);
+		}
+#ifdef CONFIG_FEATURE_CLEAN_UP
+		fclose(f);
+#endif
+	}
+}
+
+int hostname_main(int argc, char **argv)
+{
+	enum {
+		OPT_d = 0x1,
+		OPT_f = 0x2,
+		OPT_i = 0x4,
+		OPT_s = 0x8,
+		OPT_dfis = 0xf,
+	};
+
+	char buf[256];
+	unsigned opt;
+	char *hostname_str = NULL;
+
+	if (argc < 1)
+		bb_show_usage();
+
+	opt = getopt32(argc, argv, "dfisF:", &hostname_str);
+
+	/* Output in desired format */
+	if (opt & OPT_dfis) {
+		struct hostent *hp;
+		char *p;
+		gethostname(buf, sizeof(buf));
+		hp = xgethostbyname(buf);
+		p = strchr(hp->h_name, '.');
+		if (opt & OPT_f) {
+			puts(hp->h_name);
+		} else if (opt & OPT_s) {
+			if (p != NULL) {
+				*p = 0;
+			}
+			puts(hp->h_name);
+		} else if (opt & OPT_d) {
+			if (p) puts(p + 1);
+		} else if (opt & OPT_i) {
+			while (hp->h_addr_list[0]) {
+				printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
+			}
+			puts("");
+		}
+	}
+	/* Set the hostname */
+	else if (hostname_str != NULL) {
+		do_sethostname(hostname_str, 1);
+	} else if (optind < argc) {
+		do_sethostname(argv[optind], 0);
+	}
+	/* Or if all else fails,
+	 * just print the current hostname */
+	else {
+		gethostname(buf, sizeof(buf));
+		puts(buf);
+	}
+	return 0;
+}