tests: Added test server

The server can be configured through command line options or by
providing a state structure with the desired values set.

Currently supports only password based authentication.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

tests/server/test_server/default_cb.h

@@ -0,0 +1,160 @@
+/*
+ * This file is part of the SSH Library
+ *
+ * Copyright (c) 2018 by Red Hat, Inc.
+ *
+ * Author: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
+ *
+ * The SSH Library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * The SSH Library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the SSH Library; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include <libssh/libssh.h>
+#include <libssh/callbacks.h>
+
+#define SSHD_DEFAULT_USER "libssh"
+#define SSHD_DEFAULT_PASSWORD "libssh"
+#define SSHD_DEFAULT_PORT 2222
+#define SSHD_DEFAULT_ADDRESS "127.0.0.1"
+#define SSHD_DEFAULT_PCAP_FILE "debug.server.pcap"
+
+#ifndef KEYS_FOLDER
+#ifdef _WIN32
+#define KEYS_FOLDER
+#else
+#define KEYS_FOLDER "/etc/ssh/"
+#endif
+#endif
+
+#define BUF_SIZE 1048576
+#define SESSION_END (SSH_CLOSED | SSH_CLOSED_ERROR)
+#define SFTP_SERVER_PATH "/usr/lib/sftp-server"
+
+#ifdef HAVE_PTY_H
+#include <pty.h>
+#endif
+
+/* A userdata struct for channel. */
+struct channel_data_st {
+    /* pid of the child process the channel will spawn. */
+    pid_t pid;
+    /* For PTY allocation */
+    socket_t pty_master;
+    socket_t pty_slave;
+    /* For communication with the child process. */
+    socket_t child_stdin;
+    socket_t child_stdout;
+    /* Only used for subsystem and exec requests. */
+    socket_t child_stderr;
+    /* Event which is used to poll the above descriptors. */
+    ssh_event event;
+    /* Terminal size struct. */
+    struct winsize *winsize;
+};
+
+/* A userdata struct for session. */
+struct session_data_st {
+    /* Pointer to the channel the session will allocate. */
+    ssh_channel channel;
+    int auth_attempts;
+    int authenticated;
+    const char *username;
+    const char *password;
+#ifdef WITH_PCAP
+    ssh_pcap_file pcap;
+#endif
+};
+
+int auth_password_cb(ssh_session session, const char *user,
+        const char *password, void *userdata);
+
+#if WITH_GSSAPI
+int auth_gssapi_mic_cb(ssh_session session, const char *user,
+        const char *principal, void *userdata);
+#endif
+
+int channel_data_cb(ssh_session session, ssh_channel channel,
+        void *data, uint32_t len, int is_stderr, void *userdata);
+
+void channel_eof_cb(ssh_session session, ssh_channel channel,
+        void *userdata);
+
+void channel_close_cb(ssh_session session, ssh_channel channel,
+        void *userdata);
+
+void channel_signal_cb (ssh_session session,
+        ssh_channel channel,
+        const char *signal,
+        void *userdata);
+
+void channel_exit_status_cb (ssh_session session,
+        ssh_channel channel,
+        int exit_status,
+        void *userdata);
+
+void channel_exit_signal_cb(ssh_session session,
+        ssh_channel channel,
+        const char *signal,
+        int core,
+        const char *errmsg,
+        const char *lang,
+        void *userdata);
+
+int channel_pty_request_cb(ssh_session session, ssh_channel channel,
+        const char *term, int cols, int rows, int py, int px, void *userdata);
+
+int channel_pty_resize_cb(ssh_session session, ssh_channel channel,
+        int cols, int rows, int py, int px, void *userdata);
+
+int channel_shell_request_cb(ssh_session session, ssh_channel channel,
+        void *userdata);
+
+void channel_auth_agent_req_callback(ssh_session session,
+        ssh_channel channel, void *userdata);
+
+void channel_x11_req_callback(ssh_session session,
+        ssh_channel channel,
+        int single_connection,
+        const char *auth_protocol,
+        const char *auth_cookie,
+        uint32_t screen_number,
+        void *userdata);
+
+int channel_exec_request_cb(ssh_session session,
+        ssh_channel channel,
+        const char *command,
+        void *userdata);
+
+int channel_env_request_cb(ssh_session session,
+        ssh_channel channel, const char *env_name, const char *env_value,
+        void *userdata);
+
+int channel_subsystem_request_cb(ssh_session session,
+        ssh_channel channel, const char *subsystem,
+        void *userdata);
+
+int channel_write_wontblock_cb(ssh_session session,
+        ssh_channel channel,
+        size_t bytes,
+        void *userdata);
+
+ssh_channel channel_new_session_cb(ssh_session session, void *userdata);
+
+struct ssh_server_callbacks_struct *get_default_server_cb(void);
+
+void default_handle_session_cb(ssh_event event, ssh_session session,
+        struct server_state_st *state);