summaryrefslogtreecommitdiffstats
path: root/login-utils/nologin.c
diff options
context:
space:
mode:
Diffstat (limited to 'login-utils/nologin.c')
-rw-r--r--login-utils/nologin.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/login-utils/nologin.c b/login-utils/nologin.c
new file mode 100644
index 0000000..ecbd0d2
--- /dev/null
+++ b/login-utils/nologin.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2013 Karel Zak <kzak@redhat.com>
+ */
+
+#include <stdio.h>
+#include <sys/stat.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"
+#include "fileutils.h"
+
+/*
+ * Always return EXIT_FAILURE (1), don't try to be smart!
+ */
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out,
+ _(" %s [options]\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Politely refuse a login.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -c, --command <command> does nothing (for compatibility with su -c)\n"), out);
+ printf(USAGE_HELP_OPTIONS(26));
+
+ printf(USAGE_MAN_TAIL("nologin(8)"));
+ exit(EXIT_FAILURE);
+}
+
+int main(int argc, char *argv[])
+{
+ int c, fd = -1;
+ struct stat st;
+ enum {
+ OPT_INIT_FILE = CHAR_MAX + 1,
+ OPT_NOPROFILE,
+ OPT_NORC,
+ OPT_POSIX,
+ OPT_RCFILE
+ };
+ static const struct option longopts[] = {
+ { "command", required_argument, NULL, 'c' },
+ { "init-file", required_argument, NULL, OPT_INIT_FILE },
+ { "interactive", no_argument, NULL, 'i' },
+ { "login", no_argument, NULL, 'l' },
+ { "noprofile", no_argument, NULL, OPT_NOPROFILE },
+ { "norc", no_argument, NULL, OPT_NORC },
+ { "posix", no_argument, NULL, OPT_POSIX },
+ { "rcfile", required_argument, NULL, OPT_RCFILE },
+ { "restricted", no_argument, NULL, 'r' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+
+ while ((c = getopt_long(argc, argv, "c:ilrhV", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'c':
+ case OPT_INIT_FILE:
+ case 'i':
+ case 'l':
+ case OPT_NOPROFILE:
+ case OPT_NORC:
+ case OPT_POSIX:
+ case OPT_RCFILE:
+ case 'r':
+ /* Ignore well known shell command-line options */
+ break;
+ case 'h':
+ usage();
+ case 'V':
+ print_version(EXIT_FAILURE); /* yes FAILURE! */
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
+ if (fd < 0)
+ goto dflt;
+
+ c = fstat(fd, &st);
+ if (c < 0 || !S_ISREG(st.st_mode))
+ goto dflt;
+ else {
+ ul_copy_file(fd, STDOUT_FILENO);
+ close(fd);
+ return EXIT_FAILURE;
+ }
+
+dflt:
+ if (fd >= 0)
+ close(fd);
+ fprintf(stdout, _("This account is currently not available.\n"));
+ return EXIT_FAILURE;
+}