/*
 * Copyright (C) 1996, 2000 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
 * Copyright (C) 2003-2022 Wayne Davison
 *
 * 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 3 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, visit the http://fsf.org website.
 */

#define False 0
#define True 1
#define Unset (-1) /* Our BOOL values are always an int. */

#define BLOCK_SIZE 700
#define RSYNC_RSH_ENV "RSYNC_RSH"
#define RSYNC_RSH_IO_ENV "RSYNC_RSH_IO"

#define RSYNC_NAME "rsync"
/* RSYNCD_SYSCONF is now set in config.h */
#define RSYNCD_USERCONF "rsyncd.conf"

#define DEFAULT_LOCK_FILE "/var/run/rsyncd.lock"
#define URL_PREFIX "rsync://"

#define SYMLINK_PREFIX "/rsyncd-munged/"  /* This MUST have a trailing slash! */
#define SYMLINK_PREFIX_LEN ((int)sizeof SYMLINK_PREFIX - 1)

#define BACKUP_SUFFIX "~"

/* a non-zero CHAR_OFFSET makes the rolling sum stronger, but is
   incompatible with older versions :-( */
#define CHAR_OFFSET 0

/* These flags are only used during the flist transfer. */

#define XMIT_TOP_DIR (1<<0)
#define XMIT_SAME_MODE (1<<1)
#define XMIT_SAME_RDEV_pre28 (1<<2)	/* protocols 20 - 27  */
#define XMIT_EXTENDED_FLAGS (1<<2)	/* protocols 28 - now */
#define XMIT_SAME_UID (1<<3)
#define XMIT_SAME_GID (1<<4)
#define XMIT_SAME_NAME (1<<5)
#define XMIT_LONG_NAME (1<<6)
#define XMIT_SAME_TIME (1<<7)

#define XMIT_SAME_RDEV_MAJOR (1<<8)	/* protocols 28 - now (devices only) */
#define XMIT_NO_CONTENT_DIR (1<<8)	/* protocols 30 - now (dirs only) */
#define XMIT_HLINKED (1<<9)		/* protocols 28 - now (non-dirs) */
#define XMIT_SAME_DEV_pre30 (1<<10)	/* protocols 28 - 29  */
#define XMIT_USER_NAME_FOLLOWS (1<<10)	/* protocols 30 - now */
#define XMIT_RDEV_MINOR_8_pre30 (1<<11) /* protocols 28 - 29  */
#define XMIT_GROUP_NAME_FOLLOWS (1<<11) /* protocols 30 - now */
#define XMIT_HLINK_FIRST (1<<12)	/* protocols 30 - now (HLINKED files only) */
#define XMIT_IO_ERROR_ENDLIST (1<<12)	/* protocols 31*- now (w/XMIT_EXTENDED_FLAGS) (also protocol 30 w/'f' compat flag) */
#define XMIT_MOD_NSEC (1<<13)		/* protocols 31 - now */
#define XMIT_SAME_ATIME (1<<14) 	/* any protocol - restricted by command-line option */
#define XMIT_UNUSED_15 (1<<15)  	/* unused flag bit */

/* The following XMIT flags require an rsync that uses a varint for the flag values */

#define XMIT_RESERVED_16 (1<<16) 	/* reserved for future fileflags use */
#define XMIT_CRTIME_EQ_MTIME (1<<17)	/* any protocol - restricted by command-line option */

/* These flags are used in the live flist data. */

#define FLAG_TOP_DIR (1<<0)	/* sender/receiver/generator */
#define FLAG_OWNED_BY_US (1<<0) /* generator: set by make_file() for aux flists only */
#define FLAG_FILE_SENT (1<<1)	/* sender/receiver/generator */
#define FLAG_DIR_CREATED (1<<1)	/* generator */
#define FLAG_CONTENT_DIR (1<<2)	/* sender/receiver/generator */
#define FLAG_MOUNT_DIR (1<<3)	/* sender/generator (dirs only) */
#define FLAG_SKIP_HLINK (1<<3)	/* receiver/generator (w/FLAG_HLINKED) */
#define FLAG_DUPLICATE (1<<4)	/* sender */
#define FLAG_MISSING_DIR (1<<4)	/* generator */
#define FLAG_HLINKED (1<<5)	/* receiver/generator (checked on all types) */
#define FLAG_HLINK_FIRST (1<<6)	/* receiver/generator (w/FLAG_HLINKED) */
#define FLAG_IMPLIED_DIR (1<<6)	/* sender/receiver/generator (dirs only) */
#define FLAG_HLINK_LAST (1<<7)	/* receiver/generator */
#define FLAG_HLINK_DONE (1<<8)	/* receiver/generator (checked on all types) */
#define FLAG_LENGTH64 (1<<9)	/* sender/receiver/generator */
#define FLAG_SKIP_GROUP (1<<10)	/* receiver/generator */
#define FLAG_TIME_FAILED (1<<11)/* generator */
#define FLAG_MOD_NSEC (1<<12)	/* sender/receiver/generator */
#define FLAG_GOT_DIR_FLIST (1<<13)/* sender/receiver/generator - dir_flist only */

/* These flags are passed to functions but not stored. */

#define FLAG_DIVERT_DIRS (1<<16)   /* sender, but must be unique */
#define FLAG_PERHAPS_DIR (1<<17)   /* generator */

/* These flags are for get_dirlist(). */
#define GDL_IGNORE_FILTER_RULES (1<<0)
#define GDL_PERHAPS_DIR (1<<1)

/* Some helper macros for matching bits. */
#define BITS_SET(val,bits) (((val) & (bits)) == (bits))
#define BITS_SETnUNSET(val,onbits,offbits) (((val) & ((onbits)|(offbits))) == (onbits))
#define BITS_EQUAL(b1,b2,mask) (((unsigned)(b1) & (unsigned)(mask)) \
			     == ((unsigned)(b2) & (unsigned)(mask)))

/* Update this if you make incompatible changes and ALSO update the
 * SUBPROTOCOL_VERSION if it is not a final (official) release. */
#define PROTOCOL_VERSION 32

/* This is used when working on a new protocol version or for any unofficial
 * protocol tweaks.  It should be a non-zero value for each pre-release repo
 * change that affects the protocol. The official pre-release versions should
 * start with 1 (after incrementing the PROTOCOL_VERSION) and go up by 1 for
 * each new protocol change.  For unofficial changes, pick a fairly large
 * random number that will hopefully not collide with anyone else's unofficial
 * protocol.  It must ALWAYS be 0 when the protocol goes final (and official)
 * and NEVER before!  When rsync negotiates a protocol match, it will only
 * allow the newest protocol to be used if the SUBPROTOCOL_VERSION matches.
 * All older protocol versions MUST be compatible with the final, official
 * release of the protocol, so don't tweak the code to change the protocol
 * behavior for an older protocol version. */
#define SUBPROTOCOL_VERSION 0

/* We refuse to interoperate with versions that are not in this range.
 * Note that we assume we'll work with later versions: the onus is on
 * people writing them to make sure that they don't send us anything
 * we won't understand.
 *
 * Interoperation with old but supported protocol versions
 * should cause a warning to be printed.  At a future date
 * the old protocol will become the minimum and
 * compatibility code removed.
 *
 * There are two possible explanations for the limit at
 * MAX_PROTOCOL_VERSION: either to allow new major-rev versions that
 * do not interoperate with us, and (more likely) so that we can
 * detect an attempt to connect rsync to a non-rsync server, which is
 * unlikely to begin by sending a byte between MIN_PROTOCL_VERSION and
 * MAX_PROTOCOL_VERSION. */

#define MIN_PROTOCOL_VERSION 20
#define OLD_PROTOCOL_VERSION 25
#define MAX_PROTOCOL_VERSION 40

#define MIN_FILECNT_LOOKAHEAD 1000
#define MAX_FILECNT_LOOKAHEAD 10000

#define RSYNC_PORT 873

#define SPARSE_WRITE_SIZE (1024)
#define WRITE_SIZE (32*1024)
#define CHUNK_SIZE (32*1024)
#define MAX_MAP_SIZE (256*1024)
#define IO_BUFFER_SIZE (32*1024)
#define MAX_BLOCK_SIZE ((int32)1 << 17)

/* For compatibility with older rsyncs */
#define OLD_MAX_BLOCK_SIZE ((int32)1 << 29)

/* Policy ceilings on attacker-controlled wire values. Picked well above any
 * legitimate filesystem / protocol traffic but well below sizes that could
 * cause integer overflow or DoS-grade allocations. See input_checking.txt.
 *
 * Note on MAX_WIRE_XATTR_DATALEN: xattr datum size is bounded only by the
 * wire-format maximum (signed int32 varint, ~2GB). macOS resource forks
 * are transferred as the com.apple.ResourceFork xattr and can legitimately
 * be many GB; --max-alloc (default 1GB, configurable) is the real
 * allocation cap. read_varint_size() still rejects negative values so a
 * hostile peer cannot wrap to ~SIZE_MAX. */
#define MAX_WIRE_XATTR_COUNT   65536
#define MAX_WIRE_XATTR_NAMELEN 4096
#define MAX_WIRE_XATTR_DATALEN ((int32)0x7fffffff)
#define MAX_WIRE_ACL_COUNT     65536
#define MAX_WIRE_NSEC          999999999
/* MAX_WIRE_DEL_STAT is the per-category cap for read_del_stats() in main.c,
 * which accumulates 5 wire-supplied counts into the int32 stats.deleted_files
 * accumulator.  Capped at 2^28 so 5 * 2^28 = 1.34 GB stays under INT32_MAX
 * (2.15 GB) with margin -- a higher cap (e.g. 2^30) would let a hostile peer
 * supplying 3+ max-sized counts overflow the accumulator, which is signed-int
 * UB.  2^28 is still well above any plausible real transfer's deletion count. */
#define MAX_WIRE_DEL_STAT      ((int32)1 << 28)

#define ROUND_UP_1024(siz) ((siz) & (1024-1) ? ((siz) | (1024-1)) + 1 : (siz))

#define IOERR_GENERAL	(1<<0) /* For backward compatibility, this must == 1 */
#define IOERR_VANISHED	(1<<1)
#define IOERR_DEL_LIMIT (1<<2)

/* Mask of all currently defined IOERR_* bits.  Used to sanitize values
 * received from a peer via MSG_IO_ERROR so a malicious peer cannot set
 * arbitrary (undefined) bits in the local io_error, which would then be
 * stored and re-forwarded upstream.  (Undefined bits never reach the exit
 * code: cleanup.c maps only these defined bits onto RERR_* values.) */
#define IOERR_VALID_MASK (IOERR_GENERAL | IOERR_VANISHED | IOERR_DEL_LIMIT)

#define MAX_ARGS 1000
#define MAX_BASIS_DIRS 20
#define MAX_SERVER_ARGS (MAX_BASIS_DIRS*2 + 100)

#define COMPARE_DEST 1
#define COPY_DEST 2
#define LINK_DEST 3

#define MPLEX_BASE 7

#define NO_FILTERS	0
#define SERVER_FILTERS	1
#define ALL_FILTERS	2

#define XFLG_FATAL_ERRORS	(1<<0)
#define XFLG_OLD_PREFIXES	(1<<1)
#define XFLG_ANCHORED2ABS	(1<<2) /* leading slash indicates absolute */
#define XFLG_ABS_IF_SLASH	(1<<3) /* leading or interior slash is absolute */
#define XFLG_DIR2WILD3		(1<<4) /* dir/ match gets trailing *** added */

#define ATTRS_REPORT		(1<<0)
#define ATTRS_SKIP_MTIME	(1<<1)
#define ATTRS_ACCURATE_TIME	(1<<2)
#define ATTRS_SKIP_ATIME	(1<<3)
#define ATTRS_SKIP_CRTIME	(1<<5)

#define MSG_FLUSH	2
#define FULL_FLUSH	1
#define NORMAL_FLUSH	0

#define PDIR_CREATE	1
#define PDIR_DELETE	0

/* Note: 0x00 - 0x7F are used for basis_dir[] indexes! */
#define FNAMECMP_BASIS_DIR_LOW	0x00 /* Must remain 0! */
#define FNAMECMP_BASIS_DIR_HIGH 0x7F
#define FNAMECMP_FNAME		0x80
#define FNAMECMP_PARTIAL_DIR	0x81
#define FNAMECMP_BACKUP 	0x82
#define FNAMECMP_FUZZY		0x83

/* For use by the itemize_changes code */
#define ITEM_REPORT_ATIME (1<<0)
#define ITEM_REPORT_CHANGE (1<<1)
#define ITEM_REPORT_SIZE (1<<2)     /* regular files only */
#define ITEM_REPORT_TIMEFAIL (1<<2) /* symlinks only */
#define ITEM_REPORT_TIME (1<<3)
#define ITEM_REPORT_PERMS (1<<4)
#define ITEM_REPORT_OWNER (1<<5)
#define ITEM_REPORT_GROUP (1<<6)
#define ITEM_REPORT_ACL (1<<7)
#define ITEM_REPORT_XATTR (1<<8)
#define ITEM_REPORT_CRTIME (1<<10)
#define ITEM_BASIS_TYPE_FOLLOWS (1<<11)
#define ITEM_XNAME_FOLLOWS (1<<12)
#define ITEM_IS_NEW (1<<13)
#define ITEM_LOCAL_CHANGE (1<<14)
#define ITEM_TRANSFER (1<<15)
/* These are outside the range of the transmitted flags. */
#define ITEM_MISSING_DATA (1<<16)	   /* used by log_formatted() */
#define ITEM_DELETED (1<<17)		   /* used by log_formatted() */
#define ITEM_MATCHED (1<<18)		   /* used by itemize() */

#define SIGNIFICANT_ITEM_FLAGS (~(\
	ITEM_BASIS_TYPE_FOLLOWS | ITEM_XNAME_FOLLOWS | ITEM_LOCAL_CHANGE))

#define CFN_KEEP_DOT_DIRS (1<<0)
#define CFN_KEEP_TRAILING_SLASH (1<<1)
#define CFN_DROP_TRAILING_DOT_DIR (1<<2)
#define CFN_COLLAPSE_DOT_DOT_DIRS (1<<3)
#define CFN_REFUSE_DOT_DOT_DIRS (1<<4)

#define SP_DEFAULT 0
#define SP_KEEP_DOT_DIRS (1<<0)

#define CD_NORMAL 0
#define CD_SKIP_CHDIR 1

/* Log-message categories.  FLOG only goes to the log file, not the client;
 * FCLIENT is the opposite. */
enum logcode {
    FNONE=0, /* never sent */
    FERROR_XFER=1, FINFO=2, /* sent over socket for any protocol */
    FERROR=3, FWARNING=4, /* sent over socket for protocols >= 30 */
    FERROR_SOCKET=5, FLOG=6, /* only sent via receiver -> generator pipe */
    FERROR_UTF8=8, /* only sent via receiver -> generator pipe */
    FCLIENT=7 /* never transmitted (e.g. server converts to FINFO) */
};

/* Messages types that are sent over the message channel.  The logcode
 * values must all be present here with identical numbers. */
enum msgcode {
	MSG_DATA=0,	/* raw data on the multiplexed stream */
	MSG_ERROR_XFER=FERROR_XFER, MSG_INFO=FINFO, /* remote logging */
	MSG_ERROR=FERROR, MSG_WARNING=FWARNING, /* protocol-30 remote logging */
	MSG_ERROR_SOCKET=FERROR_SOCKET, /* sibling logging */
	MSG_ERROR_UTF8=FERROR_UTF8, /* sibling logging */
	MSG_LOG=FLOG, MSG_CLIENT=FCLIENT, /* sibling logging */
	MSG_REDO=9,	/* reprocess indicated flist index */
	MSG_STATS=10,	/* message has stats data for generator */
	MSG_IO_ERROR=22,/* the sending side had an I/O error */
	MSG_IO_TIMEOUT=33,/* tell client about a daemon's timeout value */
	MSG_NOOP=42,	/* a do-nothing message (legacy protocol-30 only) */
	MSG_ERROR_EXIT=86, /* synchronize an error exit (siblings and protocol >= 31) */
	MSG_SUCCESS=100,/* successfully updated indicated flist index */
	MSG_DELETED=101,/* successfully deleted a file on receiving side */
	MSG_NO_SEND=102,/* sender failed to open a file we wanted */
};

enum filetype {
	FT_UNSUPPORTED, FT_REG, FT_DIR, FT_SYMLINK, FT_SPECIAL, FT_DEVICE
};

#define NDX_DONE -1
#define NDX_FLIST_EOF -2
#define NDX_DEL_STATS -3
#define NDX_FLIST_OFFSET -101

/* For calling delete_item() and delete_dir_contents(). */
#define DEL_NO_UID_WRITE 	(1<<0) /* file/dir has our uid w/o write perm */
#define DEL_RECURSE		(1<<1) /* if dir, delete all contents */
#define DEL_DIR_IS_EMPTY	(1<<2) /* internal delete_FUNCTIONS use only */
#define DEL_FOR_FILE		(1<<3) /* making room for a replacement file */
#define DEL_FOR_DIR		(1<<4) /* making room for a replacement dir */
#define DEL_FOR_SYMLINK 	(1<<5) /* making room for a replacement symlink */
#define DEL_FOR_DEVICE		(1<<6) /* making room for a replacement device */
#define DEL_FOR_SPECIAL 	(1<<7) /* making room for a replacement special */
#define DEL_FOR_BACKUP	 	(1<<8) /* the delete is for a backup operation */

#define DEL_MAKE_ROOM (DEL_FOR_FILE|DEL_FOR_DIR|DEL_FOR_SYMLINK|DEL_FOR_DEVICE|DEL_FOR_SPECIAL)

enum delret {
	DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
};

/* Defines for make_path() */
#define MKP_DROP_NAME		(1<<0) /* drop trailing filename or trailing slash */
#define MKP_SKIP_SLASH		(1<<1) /* skip one or more leading slashes */

/* Defines for maybe_send_keepalive() */
#define MSK_ALLOW_FLUSH 	(1<<0)
#define MSK_ACTIVE_RECEIVER 	(1<<1)

#include "errcode.h"

#include "config.h"

/* The default RSYNC_RSH is always set in config.h. */

#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
#  include <stdlib.h>
# endif
#endif
#ifdef HAVE_STRING_H
# if !defined STDC_HEADERS && defined HAVE_MEMORY_H
#  include <memory.h>
# endif
# include <string.h>
#endif
#ifdef HAVE_BSD_STRING_H
# include <bsd/string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#if defined HAVE_MALLOC_H && (defined HAVE_MALLINFO || !defined HAVE_STDLIB_H)
#include <malloc.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#else
#ifdef HAVE_SYS_FCNTL_H
#include <sys/fcntl.h>
#endif
#endif

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif

#include <signal.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#include <errno.h>

/* O_NOFOLLOW refuses a final-component symlink with ELOOP on Linux, EMLINK on
 * FreeBSD, and EFTYPE on NetBSD/OpenBSD. Treat all three as "hit a symlink". A
 * genuine EMLINK (too many hard links) is harmless where this is used: callers
 * fall through to a readlink/lstat, which restores the real error. */
#ifdef EFTYPE
# define NOFOLLOW_HIT_SYMLINK(e) ((e) == ELOOP || (e) == EMLINK || (e) == EFTYPE)
#else
# define NOFOLLOW_HIT_SYMLINK(e) ((e) == ELOOP || (e) == EMLINK)
#endif

#ifdef HAVE_UTIME_H
#include <utime.h>
#endif

#if defined HAVE_UTIMENSAT || defined HAVE_LUTIMES || defined HAVE_SETATTRLIST
#define CAN_SET_SYMLINK_TIMES 1
#endif

#if defined HAVE_LCHOWN || defined CHOWN_MODIFIES_SYMLINK
#define CAN_CHOWN_SYMLINK 1
#endif

#if defined HAVE_LCHMOD || defined HAVE_SETATTRLIST
#define CAN_CHMOD_SYMLINK 1
#endif

#if defined HAVE_UTIMENSAT || defined HAVE_SETATTRLIST
#define CAN_SET_NSEC 1
#endif

#ifdef CAN_SET_NSEC
#ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
#define ST_MTIME_NSEC st_mtim.tv_nsec
#define ST_ATIME_NSEC st_atim.tv_nsec
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
#define ST_MTIME_NSEC st_mtimensec
#define ST_ATIME_NSEC st_atimensec
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
#define ST_MTIME_NSEC st_mtimespec.tv_nsec
#define ST_ATIME_NSEC st_atimespec.tv_nsec
#endif
#endif

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#ifdef HAVE_SYS_MODE_H
/* apparently AIX needs this for S_ISLNK */
#ifndef S_ISLNK
#include <sys/mode.h>
#endif
#endif

/* these are needed for the uid/gid mapping code */
#include <pwd.h>
#include <grp.h>

#include <stdarg.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <syslog.h>
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif

#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
# if !defined makedev && (defined mkdev || defined _WIN32 || defined __WIN32__)
#  define makedev mkdev
# endif
#elif defined MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif

#ifdef MAKEDEV_TAKES_3_ARGS
#define MAKEDEV(devmajor,devminor) makedev(0,devmajor,devminor)
#else
#ifndef __TANDEM
#define MAKEDEV(devmajor,devminor) makedev(devmajor,devminor)
#else
# define major DEV_TO_MAJOR
# define minor DEV_TO_MINOR
# define MAKEDEV MAJORMINOR_TO_DEV
#endif
#endif

#ifdef __TANDEM
# include <floss.h(floss_read,floss_write,floss_fork,floss_execvp)>
# include <floss.h(floss_getpwuid,floss_select,floss_seteuid)>
# define S_IEXEC S_IXUSR
# define ROOT_UID 65535
#else
# define ROOT_UID 0
#endif

#ifdef HAVE_COMPAT_H
#include <compat.h>
#endif

#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif

#if defined USE_ICONV_OPEN && defined HAVE_ICONV_H
#include <iconv.h>
#ifndef ICONV_CONST
#define ICONV_CONST
#endif
#else
#ifdef ICONV_CONST
#undef ICONV_CONST
#endif
#ifdef ICONV_OPTION
#undef ICONV_OPTION
#endif
#ifdef iconv_t
#undef iconv_t
#endif
#define iconv_t int
#endif

#include <assert.h>

#include "lib/pool_alloc.h"

#ifndef HAVE_ID_T
typedef unsigned int id_t;
#endif
#ifndef HAVE_PID_T
typedef int pid_t;
#endif
#ifndef HAVE_MODE_T
typedef unsigned int mode_t;
#endif
#ifndef HAVE_OFF_T
typedef long off_t;
#undef SIZEOF_OFF_T
#define SIZEOF_OFF_T SIZEOF_LONG
#endif
#ifndef HAVE_SIZE_T
typedef unsigned int size_t;
#endif

#define BOOL int

#ifndef uchar
#define uchar unsigned char
#endif

#ifdef SIGNED_CHAR_OK
#define schar signed char
#else
#define schar char
#endif

#ifndef int16
#if SIZEOF_INT16_T == 2
# define int16 int16_t
#else
# define int16 short
#endif
#endif

#ifndef uint16
#if SIZEOF_UINT16_T == 2
# define uint16 uint16_t
#else
# define uint16 unsigned int16
#endif
#endif

#if !defined __APPLE__ || defined HAVE_GETATTRLIST
#define SUPPORT_ATIMES 1
#endif

#if defined HAVE_GETATTRLIST || defined __CYGWIN__
#define SUPPORT_CRTIMES 1
#endif

/* Find a variable that is either exactly 32-bits or longer.
 * If some code depends on 32-bit truncation, it will need to
 * take special action in a "#if SIZEOF_INT32 > 4" section. */
#ifndef int32
#if SIZEOF_INT32_T == 4
# define int32 int32_t
# define SIZEOF_INT32 4
#elif SIZEOF_INT == 4
# define int32 int
# define SIZEOF_INT32 4
#elif SIZEOF_LONG == 4
# define int32 long
# define SIZEOF_INT32 4
#elif SIZEOF_SHORT == 4
# define int32 short
# define SIZEOF_INT32 4
#elif SIZEOF_INT > 4
# define int32 int
# define SIZEOF_INT32 SIZEOF_INT
#elif SIZEOF_LONG > 4
# define int32 long
# define SIZEOF_INT32 SIZEOF_LONG
#else
# error Could not find a 32-bit integer variable
#endif
#else
# define SIZEOF_INT32 4
#endif

#ifndef uint32
#if SIZEOF_UINT32_T == 4
# define uint32 uint32_t
#else
# define uint32 unsigned int32
#endif
#endif

#if SIZEOF_OFF_T == 8 || !SIZEOF_OFF64_T || !defined HAVE_STRUCT_STAT64
#define OFF_T off_t
#define STRUCT_STAT struct stat
#define SIZEOF_CAPITAL_OFF_T SIZEOF_OFF_T
#else
#define OFF_T off64_t
#define STRUCT_STAT struct stat64
#define USE_STAT64_FUNCS 1
#define SIZEOF_CAPITAL_OFF_T SIZEOF_OFF64_T
#endif

/* CAVEAT: on some systems, int64 will really be a 32-bit integer IFF
 * that's the maximum size the file system can handle and there is no
 * 64-bit type available.  The rsync source must therefore take steps
 * to ensure that any code that really requires a 64-bit integer has
 * it (e.g. the checksum code uses two 32-bit integers for its 64-bit
 * counter). */
#if SIZEOF_INT64_T == 8
# define int64 int64_t
# define SIZEOF_INT64 8
#elif SIZEOF_LONG == 8
# define int64 long
# define SIZEOF_INT64 8
#elif SIZEOF_INT == 8
# define int64 int
# define SIZEOF_INT64 8
#elif SIZEOF_LONG_LONG == 8
# define int64 long long
# define SIZEOF_INT64 8
#elif SIZEOF_OFF64_T == 8
# define int64 off64_t
# define SIZEOF_INT64 8
#elif SIZEOF_OFF_T == 8
# define int64 off_t
# define SIZEOF_INT64 8
#elif SIZEOF_INT > 8
# define int64 int
# define SIZEOF_INT64 SIZEOF_INT
#elif SIZEOF_LONG > 8
# define int64 long
# define SIZEOF_INT64 SIZEOF_LONG
#elif SIZEOF_LONG_LONG > 8
# define int64 long long
# define SIZEOF_INT64 SIZEOF_LONG_LONG
#else
/* As long as it gets... */
# define int64 off_t
# define SIZEOF_INT64 SIZEOF_OFF_T
#endif

#define MAX_INT32 ((int32)0x7fffffff)

#define HT_KEY32 0
#define HT_KEY64 1

struct hashtable {
	void *nodes;
	int32 size, entries;
	uint32 node_size;
	short key64;
};

struct ht_int32_node {
	void *data;
	int32 key;
};

struct ht_int64_node {
	void *data;
	int64 key;
};

#define HT_NODE(tbl, bkts, i) ((void*)((char*)(bkts) + (size_t)(i)*(tbl)->node_size))
#define HT_KEY(node, k64) ((k64)? ((struct ht_int64_node*)(node))->key \
			 : (int64)((struct ht_int32_node*)(node))->key)

#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif

#ifndef MAX
#define MAX(a,b) ((a)>(b)?(a):(b))
#endif

#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 256
#endif

#define SUM_LENGTH 16
#define SHORT_SUM_LENGTH 2
#define BLOCKSUM_BIAS 10

#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif

/* We want a roomy line buffer that can hold more than MAXPATHLEN,
 * and significantly more than an overly short MAXPATHLEN. */
#if MAXPATHLEN < 4096
#define BIGPATHBUFLEN (4096+1024)
#else
#define BIGPATHBUFLEN (MAXPATHLEN+1024)
#endif

#ifndef NAME_MAX
#define NAME_MAX 255
#endif

#ifndef SIZE_MAX
#define SIZE_MAX ((size_t)-1)
#endif

#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif

#ifndef IN_LOOPBACKNET
#define IN_LOOPBACKNET 127
#endif

#if HAVE_UNIXWARE_ACLS|HAVE_SOLARIS_ACLS|HAVE_HPUX_ACLS
#define ACLS_NEED_MASK 1
#endif

#if defined HAVE_FALLOCATE || HAVE_SYS_FALLOCATE
#ifdef HAVE_LINUX_FALLOC_H
#include <linux/falloc.h>
#endif
#ifdef FALLOC_FL_KEEP_SIZE
#define SUPPORT_PREALLOCATION 1
#elif defined HAVE_FTRUNCATE
#define SUPPORT_PREALLOCATION 1
#define PREALLOCATE_NEEDS_TRUNCATE 1
#endif
#else /* !fallocate */
#if defined HAVE_EFFICIENT_POSIX_FALLOCATE && defined HAVE_FTRUNCATE
#define SUPPORT_PREALLOCATION 1
#define PREALLOCATE_NEEDS_TRUNCATE 1
#endif
#endif

#if SIZEOF_CHARP == 4
# define PTRS_ARE_32 1
# define PTR_EXTRA_CNT 1
#elif SIZEOF_CHARP == 8
# define PTRS_ARE_64 1
# define PTR_EXTRA_CNT EXTRA64_CNT
#else
# error Character pointers are not 4 or 8 bytes.
#endif

#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
#define USE_FLEXIBLE_ARRAY 1
#define SIZE_T_FMT_MOD "z" /* printf supports %zd */
#define SIZE_T_FMT_CAST size_t
#else
#define SIZE_T_FMT_MOD "l" /* printf supports %ld */
#define SIZE_T_FMT_CAST long
#endif

union file_extras {
	int32 num;
	uint32 unum;
#ifdef PTRS_ARE_32
	const char* ptr;
#endif
};

union file_extras64 {
	int64 num;
#ifdef PTRS_ARE_64
	const char* ptr;
#endif
};

struct file_struct {
	const char *dirname;	/* The dir info inside the transfer */
	time_t modtime;		/* When the item was last modified */
	uint32 len32;		/* Lowest 32 bits of the file's length */
	uint16 mode;		/* The item's type and permissions */
	uint16 flags;		/* The FLAG_* bits for this item */
#ifdef USE_FLEXIBLE_ARRAY
	const char basename[];	/* The basename (AKA filename) follows */
#else
	const char basename[1];	/* A kluge that should work like a flexible array */
#endif
};

extern int file_extra_cnt;
extern int inc_recurse;
extern int atimes_ndx;
extern int crtimes_ndx;
extern int pathname_ndx;
extern int depth_ndx;
extern int uid_ndx;
extern int gid_ndx;
extern int acls_ndx;
extern int xattrs_ndx;
extern int file_sum_extra_cnt;

#ifdef USE_FLEXIBLE_ARRAY
#define FILE_STRUCT_LEN (sizeof (struct file_struct))
#else
#define FILE_STRUCT_LEN (offsetof(struct file_struct, basename))
#endif
#define EXTRA_LEN (sizeof (union file_extras))
#define DEV_EXTRA_CNT 2
#define DIRNODE_EXTRA_CNT 3
#define EXTRA64_CNT ((sizeof (union file_extras64) + EXTRA_LEN - 1) / EXTRA_LEN)
#define SUM_EXTRA_CNT file_sum_extra_cnt

#define REQ_EXTRA(f,ndx) ((union file_extras*)(f) - (ndx))
#define OPT_EXTRA(f,bump) ((union file_extras*)(f) - file_extra_cnt - 1 - (bump))

/* These are guaranteed to be allocated first in the array so that they
 * are aligned for direct int64-pointer access. */
#define REQ_EXTRA64(f,ndx) ((union file_extras64*)REQ_EXTRA(f,ndx))

#define NSEC_BUMP(f) ((f)->flags & FLAG_MOD_NSEC ? 1 : 0)
#define LEN64_BUMP(f) ((f)->flags & FLAG_LENGTH64 ? 1 : 0)
#define START_BUMP(f) (NSEC_BUMP(f) + LEN64_BUMP(f))
#define HLINK_BUMP(f) ((f)->flags & (FLAG_HLINKED|FLAG_HLINK_DONE) ? inc_recurse+1 : 0)
#define ACL_BUMP(f) (acls_ndx ? 1 : 0)

/* The length applies to all items. */
#if SIZEOF_INT64 < 8
#define F_LENGTH(f) ((int64)(f)->len32)
#else
#define F_HIGH_LEN(f) (OPT_EXTRA(f, NSEC_BUMP(f))->unum)
#define F_LENGTH(f) ((int64)(f)->len32 + ((f)->flags & FLAG_LENGTH64 ? (int64)F_HIGH_LEN(f) << 32 : 0))
#endif

#define F_MOD_NSEC(f) OPT_EXTRA(f, 0)->unum
#define F_MOD_NSEC_or_0(f) ((f)->flags & FLAG_MOD_NSEC ? F_MOD_NSEC(f) : 0)

/* If there is a symlink string, it is always right after the basename */
#define F_SYMLINK(f) ((f)->basename + strlen((f)->basename) + 1)

/* The sending side always has this available: */
#ifdef PTRS_ARE_32
#define F_PATHNAME(f) REQ_EXTRA(f, pathname_ndx)->ptr
#else
#define F_PATHNAME(f) REQ_EXTRA64(f, pathname_ndx)->ptr
#endif

/* The receiving side always has this available: */
#define F_DEPTH(f) REQ_EXTRA(f, depth_ndx)->num

/* When the associated option is on, all entries will have these present: */
#define F_OWNER(f) REQ_EXTRA(f, uid_ndx)->unum
#define F_GROUP(f) REQ_EXTRA(f, gid_ndx)->unum
#define F_ACL(f) REQ_EXTRA(f, acls_ndx)->num
#define F_XATTR(f) REQ_EXTRA(f, xattrs_ndx)->num
#define F_NDX(f) REQ_EXTRA(f, unsort_ndx)->num
#define F_ATIME(f) REQ_EXTRA64(f, atimes_ndx)->num
#define F_CRTIME(f) REQ_EXTRA64(f, crtimes_ndx)->num

/* These items are per-entry optional: */
#define F_HL_GNUM(f) OPT_EXTRA(f, START_BUMP(f))->num /* non-dirs */
#define F_HL_PREV(f) OPT_EXTRA(f, START_BUMP(f)+inc_recurse)->num /* non-dirs */
#define F_DIR_NODE_P(f) (&OPT_EXTRA(f, START_BUMP(f) \
				+ DIRNODE_EXTRA_CNT - 1)->num) /* sender dirs */
#define F_DIR_RELNAMES_P(f) (&OPT_EXTRA(f, START_BUMP(f) + DIRNODE_EXTRA_CNT \
				+ PTR_EXTRA_CNT - 1)->num) /* sender dirs */
#define F_DIR_DEFACL(f) OPT_EXTRA(f, START_BUMP(f))->unum /* receiver dirs */
#define F_DIR_DEV_P(f) (&OPT_EXTRA(f, START_BUMP(f) + ACL_BUMP(f) \
				+ DEV_EXTRA_CNT - 1)->unum) /* receiver dirs */

/* This optional item might follow an F_HL_*() item. */
#define F_RDEV_P(f) (&OPT_EXTRA(f, START_BUMP(f) + HLINK_BUMP(f) + DEV_EXTRA_CNT - 1)->unum)

/* The sum is only present on regular files. */
#define F_SUM(f) ((char*)OPT_EXTRA(f, START_BUMP(f) + HLINK_BUMP(f) \
				    + SUM_EXTRA_CNT - 1))

/* Some utility defines: */
#define F_IS_ACTIVE(f) (f)->basename[0]
#define F_IS_HLINKED(f) ((f)->flags & FLAG_HLINKED)

#define F_HLINK_NOT_FIRST(f) BITS_SETnUNSET((f)->flags, FLAG_HLINKED, FLAG_HLINK_FIRST)
#define F_HLINK_NOT_LAST(f) BITS_SETnUNSET((f)->flags, FLAG_HLINKED, FLAG_HLINK_LAST)

/* These access the F_DIR_DEV_P() and F_RDEV_P() values: */
#define DEV_MAJOR(a) (a)[0]
#define DEV_MINOR(a) (a)[1]

/* These access the F_DIRS_NODE_P() values: */
#define DIR_PARENT(a) (a)[0]
#define DIR_FIRST_CHILD(a) (a)[1]
#define DIR_NEXT_SIBLING(a) (a)[2]

#define IS_MISSING_FILE(statbuf) ((statbuf).st_mode == 0)

/*
 * Start the flist array at FLIST_START entries and grow it
 * by doubling until FLIST_LINEAR then grow by FLIST_LINEAR
 */
#define FLIST_START		(32)
#define FLIST_START_LARGE	(32 * 1024)
#define FLIST_LINEAR		(FLIST_START_LARGE * 512)

/*
 * Extent size for allocation pools: A minimum size of 128KB
 * is needed to mmap them so that freeing will release the
 * space to the OS.
 *
 * Larger sizes reduce leftover fragments and speed free calls
 * (when they happen). Smaller sizes increase the chance of
 * freed allocations freeing whole extents.
 */
#define NORMAL_EXTENT	(256 * 1024)
#define SMALL_EXTENT	(128 * 1024)

#define FLIST_TEMP	(1<<1)

struct file_list {
	struct file_list *next, *prev;
	struct file_struct **files, **sorted;
	alloc_pool_t file_pool;
	void *pool_boundary;
	int used, malloced;
	int low, high;  /* 0-relative index values excluding empties */
	int ndx_start;  /* the start offset for inc_recurse mode */
	int flist_num;  /* 1-relative file_list number or 0 */
	int parent_ndx; /* dir_flist index of parent directory */
	int in_progress, to_redo;
};

#define SUMFLG_SAME_OFFSET	(1<<0)

struct sum_buf {
	OFF_T offset;		/**< offset in file of this chunk */
	int32 len;		/**< length of chunk of file */
	uint32 sum1;	        /**< simple checksum */
	int32 chain;		/**< next hash-table collision */
	short flags;		/**< flag bits */
};

struct sum_struct {
	OFF_T flength;		/**< total file length */
	struct sum_buf *sums;	/**< points to info for each chunk */
	char *sum2_array;	/**< checksums of length xfer_sum_len */
	int32 count;		/**< how many chunks */
	int32 blength;		/**< block_length */
	int32 remainder;	/**< flength % block_length */
	int s2length;		/**< sum2_length */
};

struct map_struct {
	OFF_T file_size;	/* File size (from stat)		*/
	OFF_T p_offset;		/* Window start				*/
	OFF_T p_fd_offset;	/* offset of cursor in fd ala lseek	*/
	char *p;		/* Window pointer			*/
	int32 p_size;		/* Largest window size we allocated	*/
	int32 p_len;		/* Latest (rounded) window size		*/
	int32 def_window_size;	/* Default window size			*/
	int fd;			/* File Descriptor			*/
	int status;		/* first errno from read errors		*/
};

#define sum2_at(s, i)	((s)->sum2_array + ((size_t)(i) * xfer_sum_len))

#define NAME_IS_FILE		(0)    /* filter name as a file */
#define NAME_IS_DIR		(1<<0) /* filter name as a dir */
#define NAME_IS_XATTR		(1<<2) /* filter name as an xattr */

#define FILTRULE_WILD		(1<<0) /* pattern has '*', '[', and/or '?' */
#define FILTRULE_WILD2		(1<<1) /* pattern has '**' */
#define FILTRULE_WILD2_PREFIX	(1<<2) /* pattern starts with "**" */
#define FILTRULE_WILD3_SUFFIX	(1<<3) /* pattern ends with "***" */
#define FILTRULE_ABS_PATH	(1<<4) /* path-match on absolute path */
#define FILTRULE_INCLUDE	(1<<5) /* this is an include, not an exclude */
#define FILTRULE_DIRECTORY	(1<<6) /* this matches only directories */
#define FILTRULE_WORD_SPLIT	(1<<7) /* split rules on whitespace */
#define FILTRULE_NO_INHERIT	(1<<8) /* don't inherit these rules */
#define FILTRULE_NO_PREFIXES	(1<<9) /* parse no prefixes from patterns */
#define FILTRULE_MERGE_FILE	(1<<10)/* specifies a file to merge */
#define FILTRULE_PERDIR_MERGE	(1<<11)/* merge-file is searched per-dir */
#define FILTRULE_EXCLUDE_SELF	(1<<12)/* merge-file name should be excluded */
#define FILTRULE_FINISH_SETUP	(1<<13)/* per-dir merge file needs setup */
#define FILTRULE_NEGATE 	(1<<14)/* rule matches when pattern does not */
#define FILTRULE_CVS_IGNORE	(1<<15)/* rule was -C or :C */
#define FILTRULE_SENDER_SIDE	(1<<16)/* rule applies to the sending side */
#define FILTRULE_RECEIVER_SIDE	(1<<17)/* rule applies to the receiving side */
#define FILTRULE_CLEAR_LIST	(1<<18)/* this item is the "!" token */
#define FILTRULE_PERISHABLE	(1<<19)/* perishable if parent dir goes away */
#define FILTRULE_XATTR		(1<<20)/* rule only applies to xattr names */
#define FILTRULE_FROM_FILE	(1<<21)/* pattern text came from a file's contents */

#define FILTRULES_SIDES (FILTRULE_SENDER_SIDE | FILTRULE_RECEIVER_SIDE)

typedef struct filter_struct {
	struct filter_struct *next;
	char *pattern;
	uint32 rflags;
	union {
		int slash_cnt;
		struct filter_list_struct *mergelist;
	} u;
	uchar elide;
} filter_rule;

typedef struct filter_list_struct {
	filter_rule *head;
	filter_rule *tail;
	char *debug_type;
} filter_rule_list;

struct stats {
	int64 total_size;
	int64 total_transferred_size;
	int64 total_written;
	int64 total_read;
	int64 literal_data;
	int64 matched_data;
	int64 flist_buildtime;
	int64 flist_xfertime;
	int64 flist_size;
	int num_files, num_dirs, num_symlinks, num_devices, num_specials;
	int created_files, created_dirs, created_symlinks, created_devices, created_specials;
	int deleted_files, deleted_dirs, deleted_symlinks, deleted_devices, deleted_specials;
	int xferred_files;
};

struct chmod_mode_struct;

struct flist_ndx_item {
	struct flist_ndx_item *next;
	int ndx;
};

typedef struct {
	struct flist_ndx_item *head, *tail;
} flist_ndx_list;

#define EMPTY_ITEM_LIST {NULL, 0, 0}

typedef struct {
	void *items;
	size_t count;
	size_t malloced;
} item_list;

#define EXPAND_ITEM_LIST(lp, type, incr) \
	(type*)expand_item_list(lp, sizeof (type), #type, incr)

#define EMPTY_XBUF {NULL, 0, 0, 0}

typedef struct {
	char *buf;
	size_t pos;  /* pos = read pos in the buf */
	size_t len;  /* len = chars following pos */
	size_t size; /* size = total space in buf */
} xbuf;

#define INIT_XBUF(xb, str, ln, sz) (xb).buf = (str), (xb).len = (ln), (xb).size = (sz), (xb).pos = 0
#define INIT_XBUF_STRLEN(xb, str) (xb).buf = (str), (xb).len = strlen((xb).buf), (xb).size = (size_t)-1, (xb).pos = 0
/* This one is used to make an output xbuf based on a char[] buffer: */
#define INIT_CONST_XBUF(xb, bf) (xb).buf = (bf), (xb).size = sizeof (bf), (xb).len = (xb).pos = 0

#define ICB_EXPAND_OUT (1<<0)
#define ICB_INCLUDE_BAD (1<<1)
#define ICB_INCLUDE_INCOMPLETE (1<<2)
#define ICB_CIRCULAR_OUT (1<<3)
#define ICB_INIT (1<<4)

#define IOBUF_KEEP_BUFS 0
#define IOBUF_FREE_BUFS 1

#define MPLX_SWITCHING IOBUF_KEEP_BUFS
#define MPLX_ALL_DONE IOBUF_FREE_BUFS
#define MPLX_TO_BUFFERED 2

#define RL_EOL_NULLS (1<<0)
#define RL_DUMP_COMMENTS (1<<1)
#define RL_CONVERT (1<<2)

typedef struct {
	char name_type;
#ifdef USE_FLEXIBLE_ARRAY
	char fname[]; /* has variable size */
#else
	char fname[1]; /* A kluge that should work like a flexible array */
#endif
} relnamecache;

#ifdef USE_FLEXIBLE_ARRAY
#define RELNAMECACHE_LEN (sizeof (relnamecache))
#else
#define RELNAMECACHE_LEN (offsetof(relnamecache, fname))
#endif

#include "byteorder.h"
#include "lib/mdigest.h"
#include "lib/wildmatch.h"
#include "lib/permstring.h"
#include "lib/addrinfo.h"

#ifndef __GNUC__
#define __attribute__(x)
#else
# if __GNUC__ <= 2
# define NORETURN
# endif
#endif

#define UNUSED(x) x __attribute__((__unused__))
#ifndef NORETURN
#define NORETURN __attribute__((__noreturn__))
#endif

/* Under --enable-coverage, gcov flushes counters via an atexit handler that
 * _exit() bypasses.  Forked helpers that terminate via _exit() -- the
 * pre/post-xfer-exec children, the become_daemon original process, the
 * per-connection accept-loop child on early return -- must dump explicitly
 * or their counters are lost, which systematically under-reports daemon-side
 * coverage.  cleanup.c and main.c already inline this for the two main exit
 * paths; this macro covers the rest.  No-op when not a coverage build. */
#ifdef GCOV_COVERAGE
extern void __gcov_dump(void);
#define gcov_flush() __gcov_dump()
#else
#define gcov_flush() ((void)0)
#endif

typedef struct {
    STRUCT_STAT st;
    time_t crtime;
#ifdef SUPPORT_ACLS
    struct rsync_acl *acc_acl; /* access ACL */
    struct rsync_acl *def_acl; /* default ACL */
#endif
#ifdef SUPPORT_XATTRS
    item_list *xattr;
#endif
} stat_x;

#define ACL_READY(sx) ((sx).acc_acl != NULL)
#define XATTR_READY(sx) ((sx).xattr != NULL)

#define CLVL_NOT_SPECIFIED INT_MIN

#define CPRES_AUTO (-1)
#define CPRES_NONE 0
#define CPRES_ZLIB 1
#define CPRES_ZLIBX 2
#define CPRES_LZ4 3
#define CPRES_ZSTD 4

#define NSTR_CHECKSUM 0
#define NSTR_COMPRESS 1

struct name_num_item {
	int num, flags;
	const char *name;
	struct name_num_item *main_nni;
};

struct name_num_obj {
	const char *type;
	struct name_num_item *negotiated_nni;
	uchar *saw;
	int saw_len;
	struct name_num_item *list;
};

#ifdef EXTERNAL_ZLIB
#define read_buf read_buf_
#endif

#ifndef __cplusplus
#include "proto.h"
#endif

#ifndef SUPPORT_XATTRS
#define x_stat(fn,fst,xst) do_stat(fn,fst)
#define x_lstat(fn,fst,xst) do_lstat(fn,fst)
#define x_fstat(fd,fst,xst) do_fstat(fd,fst)
#endif

/* We have replacement versions of these if they're missing. */
#ifndef HAVE_ASPRINTF
int asprintf(char **ptr, const char *format, ...);
#endif

#ifndef HAVE_VASPRINTF
int vasprintf(char **ptr, const char *format, va_list ap);
#endif

#if !defined HAVE_VSNPRINTF || !defined HAVE_C99_VSNPRINTF
#define vsnprintf rsync_vsnprintf
int vsnprintf(char *str, size_t count, const char *fmt, va_list args);
#endif

#if !defined HAVE_SNPRINTF || !defined HAVE_C99_VSNPRINTF
#define snprintf rsync_snprintf
int snprintf(char *str, size_t count, const char *fmt,...);
#endif

#ifndef HAVE_STRERROR
extern char *sys_errlist[];
#define strerror(i) sys_errlist[i]
#endif

#ifndef HAVE_STRCHR
# define strchr                 index
# define strrchr                rindex
#endif

#ifndef HAVE_ERRNO_DECL
extern int errno;
#endif

#ifdef HAVE_READLINK
#define SUPPORT_LINKS 1
#if !defined NO_SYMLINK_XATTRS && !defined NO_SYMLINK_USER_XATTRS
#define do_readlink(path, buf, bufsiz) readlink(path, buf, bufsiz)
#endif
#endif
#ifdef HAVE_LINK
#define SUPPORT_HARD_LINKS 1
#endif

#ifdef HAVE_SIGACTION
#define SIGACTION(n,h) sigact.sa_handler=(h), sigaction((n),&sigact,NULL)
#define signal(n,h) we_need_to_call_SIGACTION_not_signal(n,h)
#else
#define SIGACTION(n,h) signal(n,h)
#endif

#ifndef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif

#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif

#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif

#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif

#ifndef S_IRUSR
#define S_IRUSR 0400
#endif

#ifndef S_IWUSR
#define S_IWUSR 0200
#endif

#ifndef ACCESSPERMS
#define ACCESSPERMS 0777
#endif

#ifndef S_ISVTX
#define S_ISVTX 0
#endif

#define CHMOD_BITS (S_ISUID | S_ISGID | S_ISVTX | ACCESSPERMS)

#ifndef _S_IFMT
#define _S_IFMT        0170000
#endif

#ifndef _S_IFLNK
#define _S_IFLNK  0120000
#endif

#ifndef S_ISLNK
#define S_ISLNK(mode) (((mode) & (_S_IFMT)) == (_S_IFLNK))
#endif

#ifndef S_ISBLK
#define S_ISBLK(mode) (((mode) & (_S_IFMT)) == (_S_IFBLK))
#endif

#ifndef S_ISCHR
#define S_ISCHR(mode) (((mode) & (_S_IFMT)) == (_S_IFCHR))
#endif

#ifndef S_ISSOCK
#ifdef _S_IFSOCK
#define S_ISSOCK(mode) (((mode) & (_S_IFMT)) == (_S_IFSOCK))
#else
#define S_ISSOCK(mode) (0)
#endif
#endif

#ifndef S_ISFIFO
#ifdef _S_IFIFO
#define S_ISFIFO(mode) (((mode) & (_S_IFMT)) == (_S_IFIFO))
#else
#define S_ISFIFO(mode) (0)
#endif
#endif

#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & (_S_IFMT)) == (_S_IFDIR))
#endif

#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & (_S_IFMT)) == (_S_IFREG))
#endif

/* work out what fcntl flag to use for non-blocking */
#ifdef O_NONBLOCK
# define NONBLOCK_FLAG O_NONBLOCK
#elif defined SYSV
# define NONBLOCK_FLAG O_NDELAY
#else
# define NONBLOCK_FLAG FNDELAY
#endif

#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7f000001
#endif

#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif

#define IS_SPECIAL(mode) (S_ISSOCK(mode) || S_ISFIFO(mode))
#define IS_DEVICE(mode) (S_ISCHR(mode) || S_ISBLK(mode))

/* Initial mask on permissions given to temporary files.  Mask off setuid
     bits and group access because of potential race-condition security
     holes, and mask other access because mode 707 is bizarre */
#define INITACCESSPERMS 0700

/* handler for null strings in printf format */
#define NS(s) ((s)?(s):"<NULL>")

extern char *do_calloc;

/* Convenient wrappers for malloc and realloc.  Use them. */
#define new(type) ((type*)my_alloc(NULL, sizeof (type), 1, __FILE__, __LINE__))
#define new0(type) ((type*)my_alloc(do_calloc, sizeof (type), 1, __FILE__, __LINE__))
#define realloc_buf(ptr, num) my_alloc((ptr), (num), 1, __FILE__, __LINE__)

#define new_array(type, num) ((type*)my_alloc(NULL, (num), sizeof (type), __FILE__, __LINE__))
#define new_array0(type, num) ((type*)my_alloc(do_calloc, (num), sizeof (type), __FILE__, __LINE__))
#define realloc_array(ptr, type, num) ((type*)my_alloc((ptr), (num), sizeof (type), __FILE__, __LINE__))

#undef strdup
#define strdup(s) my_strdup(s, __FILE__, __LINE__)

#define out_of_memory(msg) _out_of_memory(msg, __FILE__, __LINE__)
#define overflow_exit(msg) _overflow_exit(msg, __FILE__, __LINE__)

/* use magic gcc attributes to catch format errors */
 void rprintf(enum logcode , const char *, ...)
     __attribute__((format (printf, 2, 3)))
;

/* This is just like rprintf, but it also tries to print some
 * representation of the error code.  Normally errcode = errno. */
void rsyserr(enum logcode, int, const char *, ...)
     __attribute__((format (printf, 3, 4)))
     ;

/* Make sure that the O_BINARY flag is defined. */
#ifndef O_BINARY
#define O_BINARY 0
#endif

#ifndef HAVE_STRLCPY
size_t strlcpy(char *d, const char *s, size_t bufsize);
#endif

#ifndef HAVE_STRLCAT
size_t strlcat(char *d, const char *s, size_t bufsize);
#endif

#ifndef WEXITSTATUS
#define	WEXITSTATUS(stat)	((int)(((stat)>>8)&0xFF))
#endif
#ifndef WIFEXITED
#define	WIFEXITED(stat)		((int)((stat)&0xFF) == 0)
#endif

#define exit_cleanup(code) _exit_cleanup(code, __FILE__, __LINE__)

#ifdef HAVE_GETEUID
#define MY_UID() geteuid()
#else
#define MY_UID() getuid()
#endif

#ifdef HAVE_GETEGID
#define MY_GID() getegid()
#else
#define MY_GID() getgid()
#endif

#ifdef FORCE_FD_ZERO_MEMSET
#undef FD_ZERO
#define FD_ZERO(fdsetp) memset(fdsetp, 0, sizeof (fd_set))
#endif

extern short info_levels[], debug_levels[];

#define INFO_GTE(flag, lvl) (info_levels[INFO_##flag] >= (lvl))
#define INFO_EQ(flag, lvl) (info_levels[INFO_##flag] == (lvl))
#define DEBUG_GTE(flag, lvl) (debug_levels[DEBUG_##flag] >= (lvl))
#define DEBUG_EQ(flag, lvl) (debug_levels[DEBUG_##flag] == (lvl))

#define INFO_BACKUP 0
#define INFO_COPY (INFO_BACKUP+1)
#define INFO_DEL (INFO_COPY+1)
#define INFO_FLIST (INFO_DEL+1)
#define INFO_MISC (INFO_FLIST+1)
#define INFO_MOUNT (INFO_MISC+1)
#define INFO_NAME (INFO_MOUNT+1)
#define INFO_NONREG (INFO_NAME+1)
#define INFO_PROGRESS (INFO_NONREG+1)
#define INFO_REMOVE (INFO_PROGRESS+1)
#define INFO_SKIP (INFO_REMOVE+1)
#define INFO_STATS (INFO_SKIP+1)
#define INFO_SYMSAFE (INFO_STATS+1)

#define COUNT_INFO (INFO_SYMSAFE+1)

#define DEBUG_ACL 0
#define DEBUG_BACKUP (DEBUG_ACL+1)
#define DEBUG_BIND (DEBUG_BACKUP+1)
#define DEBUG_CHDIR (DEBUG_BIND+1)
#define DEBUG_CONNECT (DEBUG_CHDIR+1)
#define DEBUG_CMD (DEBUG_CONNECT+1)
#define DEBUG_DEL (DEBUG_CMD+1)
#define DEBUG_DELTASUM (DEBUG_DEL+1)
#define DEBUG_DUP (DEBUG_DELTASUM+1)
#define DEBUG_EXIT (DEBUG_DUP+1)
#define DEBUG_FILTER (DEBUG_EXIT+1)
#define DEBUG_FLIST (DEBUG_FILTER+1)
#define DEBUG_FUZZY (DEBUG_FLIST+1)
#define DEBUG_GENR (DEBUG_FUZZY+1)
#define DEBUG_HASH (DEBUG_GENR+1)
#define DEBUG_HLINK (DEBUG_HASH+1)
#define DEBUG_ICONV (DEBUG_HLINK+1)
#define DEBUG_IO (DEBUG_ICONV+1)
#define DEBUG_NSTR (DEBUG_IO+1)
#define DEBUG_OWN (DEBUG_NSTR+1)
#define DEBUG_PROTO (DEBUG_OWN+1)
#define DEBUG_RECV (DEBUG_PROTO+1)
#define DEBUG_SEND (DEBUG_RECV+1)
#define DEBUG_TIME (DEBUG_SEND+1)

#define COUNT_DEBUG (DEBUG_TIME+1)

#ifndef HAVE_INET_NTOP
const char *inet_ntop(int af, const void *src, char *dst, size_t size);
#endif

#ifndef HAVE_INET_PTON
int inet_pton(int af, const char *src, void *dst);
#endif

#ifndef HAVE_GETPASS
char *getpass(const char *prompt);
#endif

#ifdef MAINTAINER_MODE
const char *get_panic_action(void);
#endif

#define NOISY_DEATH(msg) do { \
    fprintf(stderr, "%s in %s at line %d\n", msg, __FILE__, __LINE__); \
    exit_cleanup(RERR_UNSUPPORTED); \
} while (0)

#ifdef HAVE_MALLINFO2
#define MEM_ALLOC_INFO mallinfo2
#elif defined HAVE_MALLINFO
#define MEM_ALLOC_INFO mallinfo
#endif
