login: move check_securetty to libbb

Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 28 insertions, 19 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 777a4a884..6b33ffad6 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1481,6 +1481,11 @@ extern void selinux_or_die(void) FAST_FUNC;
 #define SETUP_ENV_NO_CHDIR  (1 << 4)
 void setup_environment(const char *shell, int flags, const struct passwd *pw) FAST_FUNC;
 void nuke_str(char *str) FAST_FUNC;
+#if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM
+int check_securetty(const char *short_tty) FAST_FUNC;
+#else
+static ALWAYS_INLINE int check_securetty(const char *short_tty UNUSED_PARAM) { return 1; }
+#endif
 int check_password(const struct passwd *pw, const char *plaintext) FAST_FUNC;
 int ask_and_check_password_extended(const struct passwd *pw, int timeout, const char *prompt) FAST_FUNC;
 int ask_and_check_password(const struct passwd *pw) FAST_FUNC;
diff --git a/libbb/Kbuild.src b/libbb/Kbuild.src
index 898a51a89..49493c501 100644
--- a/libbb/Kbuild.src
+++ b/libbb/Kbuild.src
@@ -83,6 +83,7 @@ lib-y += safe_gethostname.o
 lib-y += safe_poll.o
 lib-y += safe_strncpy.o
 lib-y += safe_write.o
+lib-y += securetty.o
 lib-y += setup_environment.o
 lib-y += signals.o
 lib-y += simplify_path.o
diff --git a/libbb/securetty.c b/libbb/securetty.c
new file mode 100644
index 000000000..176cee129
--- /dev/null
+++ b/libbb/securetty.c
@@ -0,0 +1,22 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * /etc/securetty checking.
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+
+int FAST_FUNC check_securetty(const char *short_tty)
+{
+        char *buf = (char*)"/etc/securetty"; /* any non-NULL is ok */
+        parser_t *parser = config_open2("/etc/securetty", fopen_for_read);
+        while (config_read(parser, &buf, 1, 1, "# \t", PARSE_NORMAL)) {
+                if (strcmp(buf, short_tty) == 0)
+                        break;
+                buf = NULL;
+        }
+        config_close(parser);
+        /* buf != NULL here if config file was not found, empty
+         * or line was found which equals short_tty */
+        return buf != NULL;
+}
diff --git a/loginutils/login.c b/loginutils/login.c
index d1757a65d..661a87448 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -175,25 +175,6 @@ static void die_if_nologin(void)
 # define die_if_nologin() ((void)0)
 #endif
 
-#if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM
-static int check_securetty(const char *short_tty)
-{
-        char *buf = (char*)"/etc/securetty"; /* any non-NULL is ok */
-        parser_t *parser = config_open2("/etc/securetty", fopen_for_read);
-        while (config_read(parser, &buf, 1, 1, "# \t", PARSE_NORMAL)) {
-                if (strcmp(buf, short_tty) == 0)
-                        break;
-                buf = NULL;
-        }
-        config_close(parser);
-        /* buf != NULL here if config file was not found, empty
-         * or line was found which equals short_tty */
-        return buf != NULL;
-}
-#else
-static ALWAYS_INLINE int check_securetty(const char *short_tty UNUSED_PARAM) { return 1; }
-#endif
-
 #if ENABLE_SELINUX
 static void initselinux(char *username, char *full_tty,
                                                 security_context_t *user_sid)