nologin: add new command

Currently it's maintained as distro specific (or people use impolite
/bin/false way).

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/login-utils/nologin.c b/login-utils/nologin.c
new file mode 100644
index 000000000..a4fb82db6
--- /dev/null
+++ b/login-utils/nologin.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2013 Karel Zak <kzak@redhat.com>
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include "c.h"
+#include "nls.h"
+#include "pathnames.h"
+
+/*
+ * Always return EXIT_FAILURE (1), don't try to be smart!
+ */
+
+static void __attribute__((__noreturn__)) usage(FILE *out)
+{
+	fputs(USAGE_HEADER, out);
+
+	fprintf(out,
+		_(" %s [options]\n"), program_invocation_short_name);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(USAGE_HELP, out);
+	fputs(USAGE_VERSION, out);
+
+	fprintf(out, USAGE_MAN_TAIL("nologin(8)"));
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char *argv[])
+{
+	int c, fd;
+	static const struct option longopts[] = {
+		{ "help",    0, 0, 'h' },
+		{ "version", 0, 0, 'V' },
+		{ NULL, 0, 0, 0 }
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+
+	while ((c = getopt_long(argc, argv, "hV", longopts, NULL)) != -1) {
+		switch (c) {
+		case 'h':
+			usage(stdout);
+			break;
+		case 'V':
+			printf(UTIL_LINUX_VERSION);
+			return EXIT_FAILURE;
+		default:
+			usage(stderr);
+			break;
+		}
+	}
+
+	fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
+	if (fd >= 0) {
+		char buf[BUFSIZ];
+		ssize_t rd;
+
+		while ((rd = read(fd, buf, sizeof(buf))) > 0)
+			ignore_result( write(STDOUT_FILENO, buf, rd) );
+		close(fd);
+	} else
+		fprintf(stdout, _("This account is currently not available.\n"));
+
+	return EXIT_FAILURE;
+}