Adding expand-path@openssh.com extension for client

Signed-off-by: anshul agrawal <anshulagrawal2902@gmail.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
Reviewed-by: Eshan Kelkar <eshankelkar@galorithm.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

tests/client/torture_sftp_expand_path.c

@@ -0,0 +1,125 @@
+#include "config.h"
+
+#define LIBSSH_STATIC
+
+#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_expand_path(void **state)
+{
+    struct torture_state *s = *state;
+    struct torture_sftp *t = s->ssh.tsftp;
+    struct passwd *pwd = NULL;
+    char *expanded_path = NULL;
+    int rc;
+
+    rc = sftp_extension_supported(t->sftp, "expand-path@openssh.com", "1");
+    if (rc == 0) {
+        skip();
+    }
+
+    pwd = getpwnam(TORTURE_SSH_USER_ALICE);
+    assert_non_null(pwd);
+
+    /* testing for a absolute path */
+    expanded_path = sftp_expand_path(t->sftp, "~/.");
+    assert_non_null(expanded_path);
+
+    assert_string_equal(expanded_path, pwd->pw_dir);
+
+    SSH_STRING_FREE_CHAR(expanded_path);
+
+    /* testing for a relative path */
+    expanded_path = sftp_expand_path(t->sftp, ".");
+    assert_non_null(expanded_path);
+
+    assert_string_equal(expanded_path, pwd->pw_dir);
+
+    SSH_STRING_FREE_CHAR(expanded_path);
+
+    /* passing a NULL sftp session */
+    expanded_path = sftp_expand_path(NULL, "~/.");
+    assert_null(expanded_path);
+
+    /* passing an invalid path */
+    expanded_path = sftp_expand_path(t->sftp, "/...//");
+    assert_null(expanded_path);
+
+    /* passing null path */
+    expanded_path = sftp_expand_path(t->sftp, NULL);
+    assert_null(expanded_path);
+}
+
+int torture_run_tests(void)
+{
+    int rc;
+    struct CMUnitTest tests[] = {
+        cmocka_unit_test_setup_teardown(torture_sftp_expand_path,
+                                        session_setup,
+                                        session_teardown)
+    };
+
+    ssh_init();
+
+    torture_filter_tests(tests);
+    rc = cmocka_run_group_tests(tests, sshd_setup, sshd_teardown);
+
+    ssh_finalize();
+
+    return rc;
+}