/* -*-  mode:c; tab-width:8; c-basic-offset:8; indent-tabs-mode:nil;  -*- */
/*
   Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>

   This program 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.

   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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _LIBNFS_PRIVATE_H_
#define _LIBNFS_PRIVATE_H_

#ifdef HAVE_CONFIG_H
#include "config.h"  /* HAVE_SOCKADDR_STORAGE ? */
#endif

#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif

#ifndef WIN32
#include <sys/socket.h>  /* struct sockaddr_storage */
#endif

#if defined(WIN32) && !defined(IFNAMSIZ)
#define IFNAMSIZ 255
#endif

#include "libnfs-zdr.h"
#include "../nfs/libnfs-raw-nfs.h"
#include "../nfs4/libnfs-raw-nfs4.h"

#ifdef __cplusplus
extern "C" {
#endif

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

#if !defined(HAVE_SOCKADDR_STORAGE) && !defined(WIN32)
/*
 * RFC 2553: protocol-independent placeholder for socket addresses
 */
#define _SS_MAXSIZE	128
#define _SS_ALIGNSIZE	(sizeof(double))
#define _SS_PAD1SIZE	(_SS_ALIGNSIZE - sizeof(unsigned char) * 2)
#define _SS_PAD2SIZE	(_SS_MAXSIZE - sizeof(unsigned char) * 2 - \
				_SS_PAD1SIZE - _SS_ALIGNSIZE)

struct sockaddr_storage {
#ifdef HAVE_SOCKADDR_LEN
	unsigned char ss_len;		/* address length */
	unsigned char ss_family;	/* address family */
#else
	unsigned short ss_family;
#endif
	char	__ss_pad1[_SS_PAD1SIZE];
	double	__ss_align;	/* force desired structure storage alignment */
	char	__ss_pad2[_SS_PAD2SIZE];
};
#endif


struct rpc_fragment {
	struct rpc_fragment *next;
	uint32_t size;
	char *data;
};

#define RPC_CONTEXT_MAGIC 0xc6e46435
#define RPC_PARAM_UNDEFINED -1

/*
 * Queue is singly-linked but we hold on to the tail
 */
struct rpc_queue {
	struct rpc_pdu *head, *tail;
};

#define HASHES 1024
#define NFS_RA_TIMEOUT 5
#define NFS_MAX_XFER_SIZE (1024 * 1024)
#define ZDR_ENCODE_OVERHEAD 1024
#define ZDR_ENCODEBUF_MINSIZE 4096

struct rpc_endpoint {
        struct rpc_endpoint *next;
        int program;
        int version;
        struct service_proc *procs;
        int num_procs;
};

struct rpc_context {
	uint32_t magic;
	int fd;
	int old_fd;
	int is_connected;
	int is_nonblocking;

	char *error_string;

	rpc_cb connect_cb;
	void *connect_data;

	struct AUTH *auth;
	uint32_t xid;

	struct rpc_queue outqueue;
	struct sockaddr_storage udp_src;
	struct rpc_queue waitpdu[HASHES];
	uint32_t waitpdu_len;

	uint32_t inpos;
	char rm_buf[4];
	char *inbuf;

	/* special fields for UDP, which can sometimes be BROADCASTed */
	int is_udp;
	struct sockaddr_storage udp_dest;
	int is_broadcast;

	/* track the address we connect to so we can auto-reconnect on session failure */
	struct sockaddr_storage s;
	int auto_reconnect;
	int num_retries;

	/* fragment reassembly */
	struct rpc_fragment *fragments;

	/* parameters passable via URL */
	int tcp_syncnt;
	int uid;
	int gid;
	uint32_t readahead;
	uint32_t pagecache;
	uint32_t pagecache_ttl;
	int debug;
	int timeout;
	char ifname[IFNAMSIZ];

        /* Is a server context ? */
        int is_server_context;
        struct rpc_endpoint *endpoints;
};

struct rpc_pdu {
	struct rpc_pdu *next;

	uint32_t xid;
	ZDR zdr;

	uint32_t written;
	struct rpc_data outdata;

	rpc_cb cb;
	void *private_data;

	/* function to decode the zdr reply data and buffer to decode into */
	zdrproc_t zdr_decode_fn;
	caddr_t zdr_decode_buf;
	uint32_t zdr_decode_bufsize;

#define PDU_DISCARD_AFTER_SENDING 0x00000001
        uint32_t flags;

	uint64_t timeout;
};

void rpc_reset_queue(struct rpc_queue *q);
void rpc_enqueue(struct rpc_queue *q, struct rpc_pdu *pdu);
void rpc_return_to_queue(struct rpc_queue *q, struct rpc_pdu *pdu);
unsigned int rpc_hash_xid(uint32_t xid);

struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, zdrproc_t zdr_decode_fn, int zdr_bufsize);
struct rpc_pdu *rpc_allocate_pdu2(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, zdrproc_t zdr_decode_fn, int zdr_bufsize, size_t alloc_hint);
void rpc_free_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu);
int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu);
uint32_t rpc_get_pdu_size(char *buf);
int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size);
void rpc_error_all_pdus(struct rpc_context *rpc, const char *error);

void rpc_set_error(struct rpc_context *rpc, const char *error_string, ...)
#ifdef __GNUC__
 __attribute__((format(printf, 2, 3)))
#endif
;

void nfs_set_error(struct nfs_context *nfs, char *error_string, ...)
#ifdef __GNUC__
 __attribute__((format(printf, 2, 3)))
#endif
;

#define RPC_LOG(rpc, level, format, ...) \
	do { \
		if (level <= rpc->debug) { \
			fprintf(stderr, "libnfs:%d " format "\n", level, ## __VA_ARGS__); \
		} \
	} while (0)

const char *nfs_get_server(struct nfs_context *nfs);
const char *nfs_get_export(struct nfs_context *nfs);

/* we dont want to expose UDP to normal applications/users  this is private to libnfs to use exclusively for broadcast RPC */
int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port);
int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast);
struct rpc_context *rpc_init_udp_context(void);
struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc);

void rpc_set_autoreconnect(struct rpc_context *rpc, int num_retries);

void rpc_set_interface(struct rpc_context *rpc, const char *ifname);

void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v);
void rpc_set_pagecache(struct rpc_context *rpc, uint32_t v);
void rpc_set_pagecache_ttl(struct rpc_context *rpc, uint32_t v);
void rpc_set_readahead(struct rpc_context *rpc, uint32_t v);
void rpc_set_debug(struct rpc_context *rpc, int level);
void rpc_set_timeout(struct rpc_context *rpc, int timeout);
int rpc_get_timeout(struct rpc_context *rpc);
int rpc_add_fragment(struct rpc_context *rpc, char *data, uint32_t size);
void rpc_free_all_fragments(struct rpc_context *rpc);
int rpc_is_udp_socket(struct rpc_context *rpc);
uint64_t rpc_current_time(void);

void *zdr_malloc(ZDR *zdrs, uint32_t size);


struct nfs_cb_data;
void free_nfs_cb_data(struct nfs_cb_data *data);

struct nfs_specdata {
        uint32_t specdata1;
        uint32_t specdata2;
};
struct nfs_time {
        uint32_t seconds;
        uint32_t nseconds;
};
struct nfs_attr {
        uint32_t type;
        uint32_t mode;
        uint32_t uid;
        uint32_t gid;
        uint32_t nlink;
        uint64_t size;
        uint64_t used;
        uint64_t fsid;
        struct nfs_specdata rdev;
        struct nfs_time atime;
        struct nfs_time mtime;
        struct nfs_time ctime;
};

struct nfs_fh {
        int len;
        char *val;
};

struct nfs_context {
       struct rpc_context *rpc;
       char *server;
       char *export;
       struct nfs_fh rootfh;
       uint64_t readmax;
       uint64_t writemax;
       char *cwd;
       int dircache_enabled;
       int auto_reconnect;
       struct nfsdir *dircache;
       uint16_t	mask;

       int auto_traverse_mounts;
       struct nested_mounts *nested_mounts;

        int version;
        int nfsport;
        int mountport;

        /* NFSv4 specific fields */
        verifier4 verifier;
        char *client_name;
        uint64_t clientid;
        verifier4 setclientid_confirm;
        uint32_t seqid;
        int has_lock_owner;
};

typedef int (*continue_func)(struct nfs_context *nfs, struct nfs_attr *attr,
			     struct nfs_cb_data *data);

struct nfs_cb_data {
       struct nfs_context *nfs;
       struct nfsfh *nfsfh;
       char *saved_path, *path;
       int link_count, no_follow;

       nfs_cb cb;
       void *private_data;

       continue_func continue_cb;
       void *continue_data;
       void (*free_continue_data)(void *);
       uint64_t continue_int;

       struct nfs_fh fh;

       /* for multi-read/write calls. */
       int error;
       int cancel;
       int oom;
       int num_calls;
       size_t count, org_count;
       uint64_t offset, max_offset, org_offset;
       char *buffer;
       int not_my_buffer;
       const char *usrbuf;
       int update_pos;
};

struct nested_mounts {
       struct nested_mounts *next;
       char *path;
       struct nfs_fh fh;
       struct nfs_attr attr;
};

#define MAX_DIR_CACHE 128
#define MAX_LINK_COUNT 40

struct nfsdir {
       struct nfs_fh fh;
       struct nfs_attr attr;
       struct nfsdir *next;

       struct nfsdirent *entries;
       struct nfsdirent *current;
};

struct nfs_readahead {
       uint64_t fh_offset;
       uint32_t cur_ra;
};

struct nfs_pagecache_entry {
       char buf[NFS_BLKSIZE];
       uint64_t offset;
       time_t ts;
};

struct nfs_pagecache {
       struct nfs_pagecache_entry *entries;
       uint32_t num_entries;
       time_t ttl;
};

struct stateid {
        uint32_t seqid;
        char other[12];
};

struct nfsfh {
        struct nfs_fh fh;
        int is_sync;
        int is_append;
        int is_dirty;
        uint64_t offset;
        struct nfs_readahead ra;
        struct nfs_pagecache pagecache;

        /* NFSv4 */
        struct stateid stateid;
        /* locking */
        uint32_t lock_seqid;
        struct stateid lock_stateid;
};

const struct nfs_fh *nfs_get_rootfh(struct nfs_context *nfs);

int nfs_normalize_path(struct nfs_context *nfs, char *path);
void nfs_free_nfsdir(struct nfsdir *nfsdir);
void nfs_free_nfsfh(struct nfsfh *nfsfh);

void nfs_dircache_add(struct nfs_context *nfs, struct nfsdir *nfsdir);
struct nfsdir *nfs_dircache_find(struct nfs_context *nfs, struct nfs_fh *fh);
void nfs_dircache_drop(struct nfs_context *nfs, struct nfs_fh *fh);

char * nfs_pagecache_get(struct nfs_pagecache *pagecache, uint64_t offset);
void nfs_pagecache_put(struct nfs_pagecache *pagecache, uint64_t offset,
                       const char *buf, size_t len);

int nfs3_access_async(struct nfs_context *nfs, const char *path, int mode,
                      nfs_cb cb, void *private_data);
int nfs3_access2_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs3_chdir_async(struct nfs_context *nfs, const char *path,
                     nfs_cb cb, void *private_data);
int nfs3_chmod_async_internal(struct nfs_context *nfs, const char *path,
                              int no_follow, int mode, nfs_cb cb,
                              void *private_data);
int nfs3_chown_async_internal(struct nfs_context *nfs, const char *path,
                              int no_follow, int uid, int gid,
                              nfs_cb cb, void *private_data);
int nfs3_close_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                     void *private_data);
int nfs3_create_async(struct nfs_context *nfs, const char *path, int flags,
                      int mode, nfs_cb cb, void *private_data);
int nfs3_fchmod_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode,
                      nfs_cb cb, void *private_data);
int nfs3_fchown_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid,
                      int gid, nfs_cb cb, void *private_data);
int nfs3_fstat_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                     void *private_data);
int nfs3_fstat64_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                       void *private_data);
int nfs3_fsync_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                     void *private_data);
int nfs3_ftruncate_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                         uint64_t length, nfs_cb cb, void *private_data);
int nfs3_link_async(struct nfs_context *nfs, const char *oldpath,
		    const char *newpath, nfs_cb cb, void *private_data);
int nfs3_lseek_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     int64_t offset, int whence, nfs_cb cb, void *private_data);
int nfs3_mkdir2_async(struct nfs_context *nfs, const char *path, int mode,
                      nfs_cb cb, void *private_data);
int nfs3_mknod_async(struct nfs_context *nfs, const char *path, int mode,
                     int dev, nfs_cb cb, void *private_data);
int nfs3_mount_async(struct nfs_context *nfs, const char *server,
		     const char *export, nfs_cb cb, void *private_data);
int nfs3_open_async(struct nfs_context *nfs, const char *path, int flags,
                    int mode, nfs_cb cb, void *private_data);
int nfs3_opendir_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs3_pread_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh,
                              uint64_t offset, size_t count, nfs_cb cb,
                              void *private_data, int update_pos);
int nfs3_pwrite_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh,
                               uint64_t offset, size_t count, const char *buf,
                               nfs_cb cb, void *private_data, int update_pos);
int nfs3_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                        void *private_data);
int nfs3_rename_async(struct nfs_context *nfs, const char *oldpath,
		      const char *newpath, nfs_cb cb, void *private_data);
int nfs3_rmdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                     void *private_data);
int nfs3_stat_async(struct nfs_context *nfs, const char *path,
                    nfs_cb cb, void *private_data);
int nfs3_stat64_async(struct nfs_context *nfs, const char *path,
                      int no_follow, nfs_cb cb, void *private_data);
int nfs3_statvfs_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs3_statvfs64_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                         void *private_data);
int nfs3_symlink_async(struct nfs_context *nfs, const char *oldpath,
                       const char *newpath, nfs_cb cb, void *private_data);
int nfs3_truncate_async(struct nfs_context *nfs, const char *path,
                        uint64_t length, nfs_cb cb, void *private_data);
int nfs3_umount_async(struct nfs_context *nfs, nfs_cb cb, void *private_data);
int nfs3_unlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                      void *private_data);
int nfs3_utime_async(struct nfs_context *nfs, const char *path,
                     struct utimbuf *times, nfs_cb cb, void *private_data);
int nfs3_utimes_async_internal(struct nfs_context *nfs, const char *path,
                               int no_follow, struct timeval *times,
                               nfs_cb cb, void *private_data);
int nfs3_write_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     uint64_t count, const void *buf, nfs_cb cb,
                     void *private_data);
   
int nfs4_access_async(struct nfs_context *nfs, const char *path, int mode,
                      nfs_cb cb, void *private_data);
int nfs4_access2_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs4_chdir_async(struct nfs_context *nfs, const char *path,
                     nfs_cb cb, void *private_data);
int nfs4_chmod_async_internal(struct nfs_context *nfs, const char *path,
                              int no_follow, int mode, nfs_cb cb,
                              void *private_data);
int nfs4_chown_async_internal(struct nfs_context *nfs, const char *path,
                              int no_follow, int uid, int gid,
                              nfs_cb cb, void *private_data);
int nfs4_close_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                     void *private_data);
int nfs4_create_async(struct nfs_context *nfs, const char *path, int flags,
                      int mode, nfs_cb cb, void *private_data);
int nfs4_fchmod_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode,
                      nfs_cb cb, void *private_data);
int nfs4_fchown_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid,
                      int gid, nfs_cb cb, void *private_data);
int nfs4_fcntl_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     enum nfs4_fcntl_op cmd, void *arg,
                     nfs_cb cb, void *private_data);
int nfs4_fstat64_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                       void *private_data);
int nfs4_fsync_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb,
                     void *private_data);
int nfs4_ftruncate_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                         uint64_t length, nfs_cb cb, void *private_data);
int nfs4_link_async(struct nfs_context *nfs, const char *oldpath,
		    const char *newpath, nfs_cb cb, void *private_data);
int nfs4_lseek_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     int64_t offset, int whence, nfs_cb cb, void *private_data);
int nfs4_lockf_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     enum nfs4_lock_op op, uint64_t count,
                     nfs_cb cb, void *private_data);
int nfs4_mkdir2_async(struct nfs_context *nfs, const char *path, int mode,
                      nfs_cb cb, void *private_data);
int nfs4_mknod_async(struct nfs_context *nfs, const char *path, int mode,
                     int dev, nfs_cb cb, void *private_data);
int nfs4_mount_async(struct nfs_context *nfs, const char *server,
		     const char *export, nfs_cb cb, void *private_data);
int nfs4_open_async(struct nfs_context *nfs, const char *path, int flags,
                    int mode, nfs_cb cb, void *private_data);
int nfs4_opendir_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs4_pread_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh,
                              uint64_t offset, size_t count, nfs_cb cb,
                              void *private_data, int update_pos);
int nfs4_pwrite_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh,
                               uint64_t offset, size_t count, const char *buf,
                               nfs_cb cb, void *private_data, int update_pos);
int nfs4_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                        void *private_data);
int nfs4_rename_async(struct nfs_context *nfs, const char *oldpath,
		      const char *newpath, nfs_cb cb, void *private_data);
int nfs4_rmdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                     void *private_data);
int nfs4_stat64_async(struct nfs_context *nfs, const char *path,
                      int no_follow, nfs_cb cb, void *private_data);
int nfs4_statvfs_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                       void *private_data);
int nfs4_statvfs64_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                         void *private_data);
int nfs4_symlink_async(struct nfs_context *nfs, const char *oldpath,
                       const char *newpath, nfs_cb cb, void *private_data);
int nfs4_truncate_async(struct nfs_context *nfs, const char *path,
                        uint64_t length, nfs_cb cb, void *private_data);
int nfs4_unlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb,
                      void *private_data);
int nfs4_utime_async(struct nfs_context *nfs, const char *path,
                     struct utimbuf *times, nfs_cb cb, void *private_data);
int nfs4_utimes_async_internal(struct nfs_context *nfs, const char *path,
                               int no_follow, struct timeval *times,
                               nfs_cb cb, void *private_data);
int nfs4_write_async(struct nfs_context *nfs, struct nfsfh *nfsfh,
                     uint64_t count, const void *buf, nfs_cb cb,
                     void *private_data);

#ifdef __cplusplus
}
#endif

#endif /* !_LIBNFS_PRIVATE_H_ */
