Add tests for sftp_hardlink

For testing sftp_hardlink, torture_sftp_hardlink has been
introduced in tests/client.

Signed-off-by: Eshan Kelkar <eshankelkar@galorithm.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

tests/client/CMakeLists.txt

@@ -50,6 +50,7 @@ if (WITH_SFTP)
         torture_sftp_dir
         torture_sftp_read
         torture_sftp_fsync
+	torture_sftp_hardlink
         ${SFTP_BENCHMARK_TESTS})
 endif (WITH_SFTP)
 

tests/client/torture_sftp_hardlink.c

@@ -0,0 +1,114 @@
+#define LIBSSH_STATIC
+
+#include "config.h"
+
+#include "torture.h"
+#include "sftp.c"
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <errno.h>
+
+static int sshd_setup(void **state)
+{
+    torture_setup_sshd_server(state, false);
+    return 0;
+}
+
+static int sshd_teardown(void **state)
+{
+    torture_teardown_sshd_server(state);
+    return 0;
+}
+
+static int session_setup(void **state)
+{
+    struct torture_state *s = *state;
+    struct passwd *pwd = NULL;
+    int rc;
+
+    pwd = getpwnam("bob");
+    assert_non_null(pwd);
+
+    rc = setuid(pwd->pw_uid);
+    assert_return_code(rc, errno);
+
+    s->ssh.session = torture_ssh_session(s,
+                                         TORTURE_SSH_SERVER,
+                                         NULL,
+                                         TORTURE_SSH_USER_ALICE,
+                                         NULL);
+    assert_non_null(s->ssh.session);
+
+    s->ssh.tsftp = torture_sftp_session(s->ssh.session);
+    assert_non_null(s->ssh.tsftp);
+
+    return 0;
+}
+
+static int session_teardown(void **state)
+{
+    struct torture_state *s = *state;
+
+    torture_rmdirs(s->ssh.tsftp->testdir);
+    torture_sftp_close(s->ssh.tsftp);
+    ssh_disconnect(s->ssh.session);
+    ssh_free(s->ssh.session);
+
+    return 0;
+}
+
+static void torture_sftp_hardlink(void **state)
+{
+    struct torture_state *s = *state;
+    struct torture_sftp *t = s->ssh.tsftp;
+
+    char link_1[128] = {0};
+    char link_2[128] = {0};
+    int fd;
+    int rc;
+
+    snprintf(link_1, sizeof(link_1),
+             "%s/libssh_sftp_hardlink_test_1", t->testdir);
+    snprintf(link_2, sizeof(link_2),
+             "%s/libssh_sftp_hardlink_test_2", t->testdir);
+
+    fd = open(link_1, O_CREAT, S_IRWXU);
+    assert_return_code(fd, errno);
+    close(fd);
+
+    rc = sftp_hardlink(t->sftp, link_1, link_2);
+    assert_int_equal(rc, SSH_OK);
+
+    /* check whether the file got associated with link_2 */ 
+    rc = access(link_2, F_OK);
+    assert_int_equal(rc, 0);
+
+    unlink(link_1);
+    unlink(link_2);
+
+    /*
+     * try to create a hardlink for a file that does not
+     * exist, this should fail
+     */
+    rc = sftp_hardlink(t->sftp, link_1, link_2);
+    assert_int_not_equal(rc, 0);
+}
+
+int torture_run_tests(void)
+{
+    int rc;
+    struct CMUnitTest tests[] = {
+        cmocka_unit_test_setup_teardown(torture_sftp_hardlink,
+                                        session_setup,
+                                        session_teardown)
+    };
+
+    ssh_init();
+
+    torture_filter_tests(tests);
+    rc = cmocka_run_group_tests(tests, sshd_setup, sshd_teardown);
+    ssh_finalize();
+
+    return rc;
+}