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Current File : /usr/include/proftpd/proftpd.h
/*
 * ProFTPD - FTP server daemon
 * Copyright (c) 1997, 1998 Public Flood Software
 * Copyright (c) 1999, 2000 MacGyver aka Habeeb J. Dihu <macgyver@tos.net>
 * Copyright (c) 2001-2023 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, Public Flood Software/MacGyver aka Habeeb J. Dihu
 * 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.
 */

/* General options */

#ifndef PR_PROFTPD_H
#define PR_PROFTPD_H

#include "class.h"
#include "netaddr.h"
#include "options.h"

#ifndef TRUE
# define TRUE				1
#endif

#ifndef FALSE
# define FALSE				0
#endif

/* Definition of root user/group IDs (non-Unix platforms may have these as
 * different from 0/0).
 */
#ifdef __CYGWIN__
# define PR_ROOT_UID    18
# define PR_ROOT_GID    544
#else
# define PR_ROOT_UID    0
# define PR_ROOT_GID    0
#endif /* __CYGWIN__ */

#define CALLBACK_FRAME	\
  unsigned long p1, unsigned long p2, unsigned long p3, void *data

#define ASSERT(x)			assert(x)
#include <assert.h>

typedef int (*callback_t)(CALLBACK_FRAME);

struct class_struc;
struct conn_struc;
struct cmd_struc;
struct config_struc;
struct modret_struc;
struct server_struc;

typedef struct {
  struct pool_rec *pool;

  volatile int sf_flags;		/* Session/State flags */
  volatile int sp_flags;		/* Session/Protection flags */

  pr_netaddr_t data_addr;		/* Remote data address */
  unsigned short data_port;		/* Remote data port */

  const char *auth_mech;		/* Name of the authentication
                                         * module/mechanism that successfully
                                         * authenticated the client
					 */

  const char *rfc2228_mech;		/* RFC2228 authentication mechanism
					 * used
					 */

  char cwd[PR_TUNABLE_PATH_MAX];	/* Current working directory */
  char vwd[PR_TUNABLE_PATH_MAX];	/* Current virtual working directory */

  struct config_struc *dir_config;	/* Closest matching configuration
                                         * for current operation
                                         */

  /* Process ID of the session */
  pid_t pid;

  /* The uid/gids are manipulated by the PRIVS macros in
   * privs.h
   */

  int disable_id_switching;		/* Disable UID/GID switching */
  uid_t uid, ouid;                      /* Current and original UIDs */
  gid_t gid;                            /* Current GID */

  array_header *gids;
  array_header *groups;

  /* fsuid/fsgid are used for automagic chown after creation or upload.
   * They are initially -1, meaning no chown/chgrp.
   */
  uid_t fsuid;				/* Saved file UID */
  gid_t fsgid;				/* Saved file GID */

  const char *user, *group;		/* Username/groupname after login */
  const char *user_homedir;             /* Home directory of user before chroot
                                         */
  uid_t login_uid;                      /* UID after login, but before
                                         * session.uid is changed
                                         */
  gid_t login_gid;                      /* GID after login, but before
                                         * session.gid is changed
                                         */

  pr_table_t *notes;			/* Session notes table */

  const struct class_struc *conn_class;	/* Session class */
  const char *proc_prefix;		/* The "prefix" of our process name */

  int wtmp_log;				/* Are we logging to wtmp? */

  struct conn_struc *c;			/* Control connection */
  struct conn_struc *d;			/* Data connection */

  int hide_password;			/* Hide password in logs/ps listing */

  const char *chroot_path;		/* Chroot directory */

  struct config_struc *anon_config;	/* Anonymous FTP configuration */
  const char *anon_user;		/* Email address sent to us */

  const char *curr_cmd;			/* Current FTP command */
  int curr_cmd_id;			/* Current FTP command ID */
  struct cmd_struc *curr_cmd_rec;       /* Current command */

  int curr_phase;                       /* Current handler phase */

  struct server_struc *prev_server;	/* Previous server_rec, if HOST changed
					 * the main_server pointer.
					 */

  off_t restart_pos;			/* Restart marked position (REST) */
  off_t range_start, range_len;		/* Transfer range (RANG) */

  struct {
    struct pool_rec *p;

    int xfer_type;     /* xfer session attributes, default/append/hidden */
    int direction;
    const char *filename;		/* As shown to user */
    const char *path;			/* As used in transfer */
    const char *path_hidden;		/* As used in hidden stor */

    unsigned int bufsize, buflen;

    struct timeval start_time;		/* Time current transfer started */
    off_t file_size;			/* Total size of file (if known) */
    off_t total_bytes;			/* Total bytes transferred */

    char *bufstart, *buf;
  } xfer;

  /* Total number of bytes uploaded in this session. */
  off_t total_bytes_in;

  /* Total number of bytes downloaded in this session. */
  off_t total_bytes_out;

  /* Total number of bytes transferred in this session. */
  off_t total_bytes;

  /* Total number of files uploaded in this session. */
  unsigned int total_files_in;

  /* Total number of files downloaded in this session. */
  unsigned int total_files_out;

  /* Total number of files transferred (both uploaded and downloaded) in
   * this session.
   */
  unsigned int total_files_xfer;

  /* Total number of "raw" protocol bytes read in from the network for
   * the session.
   */
  off_t total_raw_in;

  /* Total number of "raw" protocol bytes written out to the network for
   * the session.
   */
  off_t total_raw_out;

  /* Reason code for end of session/disconnection; in reality, the values
   * come from the pr_disconnect_reason_e enum in session.h.
   */
  int disconnect_reason;

  /* Module which disconnected/ended the session */
  struct module_struc *disconnect_module;

  /* Start/connect time of the session, in milliseconds since epoch. */
  uint64_t connect_time_ms;

} session_t;

/* Daemon identity values, defined in main.c */
extern uid_t daemon_uid;
extern gid_t daemon_gid;
extern array_header *daemon_gids;

/* Possible values for xfer.xfer_type, mutually exclusive */
#define STOR_DEFAULT	0
#define STOR_APPEND	1
#define STOR_HIDDEN	2
#define STOR_UNIQUE	3

extern session_t	session;
extern char AddressCollisionCheck;
extern char ServerType;

/* Session/State flags */

#define SF_PASSIVE		0x0001	/* Data connection is in passive mode */
#define SF_ABORT		0x0002	/* Abort in progress */
#define SF_XFER			0x0004	/* Transfer in progress */
#define SF_ASCII		0x0010	/* ASCII mode transfer */
#define SF_ASCII_OVERRIDE 	0x0020	/* ASCII override this xfer only */
#define SF_ANON			0x0040	/* Anonymous (chroot) login */
#define SF_POST_ABORT		0x0100	/* After abort has occurred */
#define SF_PORT			0x0200	/* Port command given */
#define	SF_EPSV_ALL		0x0400	/* EPSV ALL in effect */

#define SF_ALL		(SF_PASSIVE|SF_ABORT|SF_XFER|SF_ASCII| \
                        SF_ASCII_OVERRIDE|SF_ANON|SF_POST_ABORT|SF_PORT| \
                        SF_EPSV_ALL)

/* Session/Protection flags (RFC 2228) */

#define SP_CCC		(1 << 0)	/* Clear command channel */
#define SP_ENC		(1 << 1)	/* Privacy protected command */
#define SP_MIC		(1 << 2)	/* Integrity protected command */
#define SP_CONF		(1 << 3)	/* Confidentiality protected command */

/* Macro to test global abort flag */
#define XFER_ABORTED	(session.sf_flags & SF_ABORT)

/* Server Types */
#define SERVER_INETD		0
#define SERVER_STANDALONE	1

/* Signals */
#define RECEIVED_SIG_RESTART	0x0001
#define RECEIVED_SIG_EXIT	0x0002
#define RECEIVED_SIG_SHUTDOWN	0x0004
#define RECEIVED_SIG_SEGV	0x0008
#define RECEIVED_SIG_TERMINATE	0x0010
#define RECEIVED_SIG_XCPU	0x0020
#define RECEIVED_SIG_XFSZ	0x0040
#define RECEIVED_SIG_ABORT	0x0080
#define RECEIVED_SIG_EVENT	0x0100
#define RECEIVED_SIG_CHLD	0x0200
#define RECEIVED_SIG_ALRM	0x0400

/* Timers */
#define PR_TIMER_LOGIN		1
#define PR_TIMER_IDLE		2
#define PR_TIMER_NOXFER		3
#define PR_TIMER_STALLED	4
#define PR_TIMER_SESSION	5

/* Developer code */

#ifdef PR_DEVEL_TIMING
# define PR_DEVEL_CLOCK(code) \
  { \
    int local_errno; \
    struct timeval local_before, local_after, local_since; \
    timerclear(&local_before); \
    timerclear(&local_after); \
    timerclear(&local_since); \
    (void) gettimeofday(&local_before, NULL); \
    (code); \
    local_errno = errno; \
    (void) gettimeofday(&local_after, NULL); \
    timersub(&local_after, &local_before, &local_since); \
    (void) pr_trace_msg("timing", 9, "code at %s:%d took %lu sec, %lu usec", __FILE__, __LINE__, (unsigned long) local_since.tv_sec, (unsigned long) local_since.tv_usec); \
    errno = local_errno; \
  }
#else
# define PR_DEVEL_CLOCK(code)   (code)
#endif /* PR_DEVEL_TIMING */

/* Misc Prototypes */
void session_exit(int, void *, int, void *);
void set_daemon_rlimits(void);
void set_session_rlimits(void);

#endif /* PR_PROFTPD_H */

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