/usr/include/proftpd/session.h is in proftpd-dev 1.3.5~rc3-2.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ProFTPD - FTP server daemon
* Copyright (c) 2009-2012 The ProFTPD Project team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, The ProFTPD Project team and other respective
* copyright holders give permission to link this program with OpenSSL, and
* distribute the resulting executable, without including the source code for
* OpenSSL in the source distribution.
*
* $Id: session.h,v 1.8 2012/04/15 18:04:14 castaglia Exp $
*/
#ifndef PR_SESSION_H
#define PR_SESSION_H
/* List of disconnect/end-of-session reason codes.
*/
/* Unknown/unspecified reason for disconnection */
#define PR_SESS_DISCONNECT_UNSPECIFIED 0
/* Disconnected gracefully */
#define PR_SESS_DISCONNECT_CLIENT_QUIT 1
/* Disconnected because of EOF on read connection */
#define PR_SESS_DISCONNECT_CLIENT_EOF 2
/* Disconnected because of session initialization failure */
#define PR_SESS_DISCONNECT_SESSION_INIT_FAILED 3
/* Disconnected by signal */
#define PR_SESS_DISCONNECT_SIGNAL 4
/* Disconnected because of out-of-memory issues */
#define PR_SESS_DISCONNECT_NOMEM 5
/* Disconnected because server shutdown */
#define PR_SESS_DISCONNECT_SERVER_SHUTDOWN 6
/* Disconnected due to a timeout of some sort */
#define PR_SESS_DISCONNECT_TIMEOUT 7
/* Disconnected because client is banned */
#define PR_SESS_DISCONNECT_BANNED 8
/* Disconnected because of configured policy, e.g. <Limit LOGIN> */
#define PR_SESS_DISCONNECT_CONFIG_ACL 9
/* Disconnected because of module-specific policy, e.g. allow/deny files */
#define PR_SESS_DISCONNECT_MODULE_ACL 10
/* Disconnected due to module misconfiguration, bad config syntax, etc */
#define PR_SESS_DISCONNECT_BAD_CONFIG 11
/* Disconnected by application (general purpose code). */
#define PR_SESS_DISCONNECT_BY_APPLICATION 12
/* Disconnected due to snprintf(3) buffer truncation. */
#define PR_SESS_DISCONNECT_SNPRINTF_TRUNCATED 13
/* Returns a string describing the reason the client was disconnected or
* the session ended. If a pointer to a char * was provided, any extra
* disconnect details will be provided.
*/
const char *pr_session_get_disconnect_reason(char **details);
/* Returns the current protocol name in use.
*
* The PR_SESS_PROTO_FL_LOGOUT flag is used when retrieving the protocol
* name to display in the login/logout messages, e.g. "FTP" or "SSH2".
*/
const char *pr_session_get_protocol(int);
#define PR_SESS_PROTO_FL_LOGOUT 0x01
/* Ends the current session but records the reason for the disconnection
* via the reason code, the module which disconnected the client, and any
* extra details the caller may provide.
*/
void pr_session_disconnect(module *m, int reason_code, const char *details);
/* Ends the current session process, unless the PR_SESS_END_FL_NOEXIT
* flag value is set. (This flag is really only used by signal handlers
* which are going to use abort(2) rather than _exit(2) to end the process.)
*/
void pr_session_end(int flags);
#define PR_SESS_END_FL_NOEXIT 0x01
#define PR_SESS_END_FL_SYNTAX_CHECK 0x02
/* Returns a so-called "tty name" suitable for use via PAM, and in WtmpLog
* logging.
*/
const char *pr_session_get_ttyname(pool *);
/* Send the 220 response/banner information to the connecting client. */
void pr_session_send_banner(server_rec *, int);
/* Marks the current session as "idle" both in the scoreboard and in the
* proctitle.
*/
int pr_session_set_idle(void);
/* Sets the current protocol name. */
int pr_session_set_protocol(const char *);
#endif /* PR_SESSION_H */
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