/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef prnetdb_h___
#define prnetdb_h___

#include "prtypes.h"
#include "prio.h"

PR_BEGIN_EXTERN_C


/*
 *********************************************************************
 *  Translate an Internet address to/from a character string
 *********************************************************************
 */
NSPR_API(PRStatus) PR_StringToNetAddr(
    const char *string, PRNetAddr *addr);

NSPR_API(PRStatus) PR_NetAddrToString(
    const PRNetAddr *addr, char *string, PRUint32 size);

/*
** Structures returned by network data base library.  All addresses are
** supplied in host order, and returned in network order (suitable for
** use in system calls).
*/
/*
** Beware that WINSOCK.H defines h_addrtype and h_length as short.
** Client code does direct struct copies of hostent to PRHostEnt and
** hence the ifdef.
*/
typedef struct PRHostEnt {
    char *h_name;       /* official name of host */
    char **h_aliases;   /* alias list */
#ifdef WIN32
    PRInt16 h_addrtype; /* host address type */
    PRInt16 h_length;   /* length of address */
#else
    PRInt32 h_addrtype; /* host address type */
    PRInt32 h_length;   /* length of address */
#endif
    char **h_addr_list; /* list of addresses from name server */
} PRHostEnt;

/* A safe size to use that will mostly work... */
#if (defined(AIX) && defined(_THREAD_SAFE))
#define PR_NETDB_BUF_SIZE sizeof(struct protoent_data)
#define PR_MIN_NETDB_BUF_SIZE PR_NETDB_BUF_SIZE
#else
/* PR_NETDB_BUF_SIZE is the recommended buffer size */
#define PR_NETDB_BUF_SIZE 2048
/* PR_MIN_NETDB_BUF_SIZE is the smallest buffer size that the API
 * accepts (for backward compatibility). */
#define PR_MIN_NETDB_BUF_SIZE 1024
#endif

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetHostByName()
** Lookup a host by name.
**
** INPUTS:
**  char *hostname      Character string defining the host name of interest
**  char *buf           A scratch buffer for the runtime to return result.
**                      This buffer is allocated by the caller.
**  PRIntn bufsize      Number of bytes in 'buf'. A recommnded value to
**                      use is PR_NETDB_BUF_SIZE.
** OUTPUTS:
**  PRHostEnt *hostentry
**                      This structure is filled in by the runtime if
**                      the function returns PR_SUCCESS. This structure
**                      is allocated by the caller.
** RETURN:
**  PRStatus            PR_SUCCESS if the lookup succeeds. If it fails
**                      the result will be PR_FAILURE and the reason
**                      for the failure can be retrieved by PR_GetError().
***********************************************************************/
NSPR_API(PRStatus) PR_GetHostByName(
    const char *hostname, char *buf, PRIntn bufsize, PRHostEnt *hostentry);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetIPNodeByName()
** Lookup a host by name. Equivalent to getipnodebyname(AI_DEFAULT)
** of RFC 2553.
**
** INPUTS:
**  char *hostname      Character string defining the host name of interest
**  PRUint16 af         Address family (either PR_AF_INET or PR_AF_INET6)
**  PRIntn flags        Specifies the types of addresses that are searched
**                      for and the types of addresses that are returned.
**                      The only supported flag is PR_AI_DEFAULT.
**  char *buf           A scratch buffer for the runtime to return result.
**                      This buffer is allocated by the caller.
**  PRIntn bufsize      Number of bytes in 'buf'. A recommnded value to
**                      use is PR_NETDB_BUF_SIZE.
** OUTPUTS:
**  PRHostEnt *hostentry
**                      This structure is filled in by the runtime if
**                      the function returns PR_SUCCESS. This structure
**                      is allocated by the caller.
** RETURN:
**  PRStatus            PR_SUCCESS if the lookup succeeds. If it fails
**                      the result will be PR_FAILURE and the reason
**                      for the failure can be retrieved by PR_GetError().
***********************************************************************/


#define PR_AI_ALL         0x08
#define PR_AI_V4MAPPED    0x10
#define PR_AI_ADDRCONFIG  0x20
#define PR_AI_NOCANONNAME 0x8000
#define PR_AI_DEFAULT     (PR_AI_V4MAPPED | PR_AI_ADDRCONFIG)

NSPR_API(PRStatus) PR_GetIPNodeByName(
    const char *hostname,
    PRUint16 af,
    PRIntn flags,
    char *buf,
    PRIntn bufsize,
    PRHostEnt *hostentry);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetHostByAddr()
** Lookup a host entry by its network address.
**
** INPUTS:
**  char *hostaddr      IP address of host in question
**  char *buf           A scratch buffer for the runtime to return result.
**                      This buffer is allocated by the caller.
**  PRIntn bufsize      Number of bytes in 'buf'. A recommnded value to
**                      use is PR_NETDB_BUF_SIZE.
** OUTPUTS:
**  PRHostEnt *hostentry
**                      This structure is filled in by the runtime if
**                      the function returns PR_SUCCESS. This structure
**                      is allocated by the caller.
** RETURN:
**  PRStatus            PR_SUCCESS if the lookup succeeds. If it fails
**                      the result will be PR_FAILURE and the reason
**                      for the failure can be retrieved by PR_GetError().
***********************************************************************/
NSPR_API(PRStatus) PR_GetHostByAddr(
    const PRNetAddr *hostaddr, char *buf, PRIntn bufsize, PRHostEnt *hostentry);

/***********************************************************************
** FUNCTION:    PR_EnumerateHostEnt()
** DESCRIPTION:
**  A stateless enumerator over a PRHostEnt structure acquired from
**  PR_GetHostByName() PR_GetHostByAddr() to evaluate the possible
**  network addresses.
**
** INPUTS:
**  PRIntn  enumIndex   Index of the enumeration. The enumeration starts
**                      and ends with a value of zero.
**
**  PRHostEnt *hostEnt  A pointer to a host entry struct that was
**                      previously returned by PR_GetHostByName() or
**                      PR_GetHostByAddr().
**
**  PRUint16 port       The port number to be assigned as part of the
**                      PRNetAddr.
**
** OUTPUTS:
**  PRNetAddr *address  A pointer to an address structure that will be
**                      filled in by the call to the enumeration if the
**                      result of the call is greater than zero.
**
** RETURN:
**  PRIntn              The value that should be used for the next call
**                      of the enumerator ('enumIndex'). The enumeration
**                      is ended if this value is returned zero.
**                      If a value of -1 is returned, the enumeration
**                      has failed. The reason for the failure can be
**                      retrieved by calling PR_GetError().
***********************************************************************/
NSPR_API(PRIntn) PR_EnumerateHostEnt(
    PRIntn enumIndex, const PRHostEnt *hostEnt, PRUint16 port, PRNetAddr *address);

/***********************************************************************
** FUNCTION: PR_InitializeNetAddr(),
** DESCRIPTION:
**  Initialize the fields of a PRNetAddr, assigning well known values as
**  appropriate.
**
** INPUTS
**  PRNetAddrValue val  The value to be assigned to the IP Address portion
**                      of the network address. This can only specify the
**                      special well known values that are equivalent to
**                      INADDR_ANY and INADDR_LOOPBACK.
**
**  PRUint16 port       The port number to be assigned in the structure.
**
** OUTPUTS:
**  PRNetAddr *addr     The address to be manipulated.
**
** RETURN:
**  PRStatus            To indicate success or failure. If the latter, the
**                      reason for the failure can be retrieved by calling
**                      PR_GetError();
***********************************************************************/
typedef enum PRNetAddrValue
{
    PR_IpAddrNull,      /* do NOT overwrite the IP address */
    PR_IpAddrAny,       /* assign logical INADDR_ANY to IP address */
    PR_IpAddrLoopback,  /* assign logical INADDR_LOOPBACK  */
    PR_IpAddrV4Mapped   /* IPv4 mapped address */
} PRNetAddrValue;

NSPR_API(PRStatus) PR_InitializeNetAddr(
    PRNetAddrValue val, PRUint16 port, PRNetAddr *addr);

/***********************************************************************
** FUNCTION: PR_SetNetAddr(),
** DESCRIPTION:
**  Set the fields of a PRNetAddr, assigning well known values as
**  appropriate. This function is similar to PR_InitializeNetAddr
**  but differs in that the address family is specified.
**
** INPUTS
**  PRNetAddrValue val  The value to be assigned to the IP Address portion
**                      of the network address. This can only specify the
**                      special well known values that are equivalent to
**                      INADDR_ANY and INADDR_LOOPBACK.
**
**  PRUint16 af         The address family (either PR_AF_INET or PR_AF_INET6)
**
**  PRUint16 port       The port number to be assigned in the structure.
**
** OUTPUTS:
**  PRNetAddr *addr     The address to be manipulated.
**
** RETURN:
**  PRStatus            To indicate success or failure. If the latter, the
**                      reason for the failure can be retrieved by calling
**                      PR_GetError();
***********************************************************************/
NSPR_API(PRStatus) PR_SetNetAddr(
    PRNetAddrValue val, PRUint16 af, PRUint16 port, PRNetAddr *addr);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_IsNetAddrType()
** Determine if the network address is of the specified type.
**
** INPUTS:
**  const PRNetAddr *addr   A network address.
**  PRNetAddrValue          The type of network address
**
** RETURN:
**  PRBool                  PR_TRUE if the network address is of the
**                          specified type, else PR_FALSE.
***********************************************************************/
NSPR_API(PRBool) PR_IsNetAddrType(const PRNetAddr *addr, PRNetAddrValue val);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_ConvertIPv4AddrToIPv6()
** Convert an IPv4 addr to an (IPv4-mapped) IPv6 addr
**
** INPUTS:
**  PRUint32    v4addr      IPv4 address
**
** OUTPUTS:
**  PRIPv6Addr *v6addr      The converted IPv6 address
**
** RETURN:
**  void
**
***********************************************************************/
NSPR_API(void) PR_ConvertIPv4AddrToIPv6(PRUint32 v4addr, PRIPv6Addr *v6addr);

/***********************************************************************
** MACRO:
** DESCRIPTION: PR_NetAddrFamily()
** Get the 'family' field of a PRNetAddr union.
**
** INPUTS:
**  const PRNetAddr *addr   A network address.
**
** RETURN:
**  PRUint16                The 'family' field of 'addr'.
***********************************************************************/
#define PR_NetAddrFamily(addr) ((addr)->raw.family)

/***********************************************************************
** MACRO:
** DESCRIPTION: PR_NetAddrInetPort()
** Get the 'port' field of a PRNetAddr union.
**
** INPUTS:
**  const PRNetAddr *addr   A network address.
**
** RETURN:
**  PRUint16                The 'port' field of 'addr'.
***********************************************************************/
#define PR_NetAddrInetPort(addr) \
    ((addr)->raw.family == PR_AF_INET6 ? (addr)->ipv6.port : (addr)->inet.port)

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetProtoByName()
** Lookup a protocol entry based on protocol's name
**
** INPUTS:
**  char *protocolname  Character string of the protocol's name.
**  char *buf           A scratch buffer for the runtime to return result.
**                      This buffer is allocated by the caller.
**  PRIntn bufsize      Number of bytes in 'buf'. A recommnded value to
**                      use is PR_NETDB_BUF_SIZE.
** OUTPUTS:
**  PRHostEnt *PRProtoEnt
**                      This structure is filled in by the runtime if
**                      the function returns PR_SUCCESS. This structure
**                      is allocated by the caller.
** RETURN:
**  PRStatus            PR_SUCCESS if the lookup succeeds. If it fails
**                      the result will be PR_FAILURE and the reason
**                      for the failure can be retrieved by PR_GetError().
***********************************************************************/

typedef struct PRProtoEnt {
    char *p_name;       /* official protocol name */
    char **p_aliases;   /* alias list */
#ifdef WIN32
    PRInt16 p_num;      /* protocol # */
#else
    PRInt32 p_num;      /* protocol # */
#endif
} PRProtoEnt;

NSPR_API(PRStatus) PR_GetProtoByName(
    const char* protocolname, char* buffer, PRInt32 bufsize, PRProtoEnt* result);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetProtoByNumber()
** Lookup a protocol entry based on protocol's number
**
** INPUTS:
**  PRInt32 protocolnumber
**                      Number assigned to the protocol.
**  char *buf           A scratch buffer for the runtime to return result.
**                      This buffer is allocated by the caller.
**  PRIntn bufsize      Number of bytes in 'buf'. A recommnded value to
**                      use is PR_NETDB_BUF_SIZE.
** OUTPUTS:
**  PRHostEnt *PRProtoEnt
**                      This structure is filled in by the runtime if
**                      the function returns PR_SUCCESS. This structure
**                      is allocated by the caller.
** RETURN:
**  PRStatus            PR_SUCCESS if the lookup succeeds. If it fails
**                      the result will be PR_FAILURE and the reason
**                      for the failure can be retrieved by PR_GetError().
***********************************************************************/
NSPR_API(PRStatus) PR_GetProtoByNumber(
    PRInt32 protocolnumber, char* buffer, PRInt32 bufsize, PRProtoEnt* result);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetAddrInfoByName()
**  Look up a host by name. Equivalent to getaddrinfo(host, NULL, ...) of
**  RFC 3493.
**
** INPUTS:
**  char *hostname      Character string defining the host name of interest
**  PRUint16 af         May be PR_AF_UNSPEC or PR_AF_INET.
**  PRIntn flags        May be either PR_AI_ADDRCONFIG or
**                      PR_AI_ADDRCONFIG | PR_AI_NOCANONNAME. Include
**                      PR_AI_NOCANONNAME to suppress the determination of
**                      the canonical name corresponding to hostname.
** RETURN:
**  PRAddrInfo*         Handle to a data structure containing the results
**                      of the host lookup. Use PR_EnumerateAddrInfo to
**                      inspect the PRNetAddr values stored in this object.
**                      When no longer needed, this handle must be destroyed
**                      with a call to PR_FreeAddrInfo.  If a lookup error
**                      occurs, then NULL will be returned.
***********************************************************************/
typedef struct PRAddrInfo PRAddrInfo;

NSPR_API(PRAddrInfo*) PR_GetAddrInfoByName(
    const char *hostname, PRUint16 af, PRIntn flags);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_FreeAddrInfo()
**  Destroy the PRAddrInfo handle allocated by PR_GetAddrInfoByName().
**
** INPUTS:
**  PRAddrInfo *addrInfo
**                      The handle resulting from a successful call to
**                      PR_GetAddrInfoByName().
** RETURN:
**  void
***********************************************************************/
NSPR_API(void) PR_FreeAddrInfo(PRAddrInfo *addrInfo);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_EnumerateAddrInfo()
**  A stateless enumerator over a PRAddrInfo handle acquired from
**  PR_GetAddrInfoByName() to inspect the possible network addresses.
**
** INPUTS:
**  void *enumPtr       Index pointer of the enumeration. The enumeration
**                      starts and ends with a value of NULL.
**  const PRAddrInfo *addrInfo
**                      The PRAddrInfo handle returned by a successful
**                      call to PR_GetAddrInfoByName().
**  PRUint16 port       The port number to be assigned as part of the
**                      PRNetAddr.
** OUTPUTS:
**  PRNetAddr *result   A pointer to an address structure that will be
**                      filled in by the call to the enumeration if the
**                      result of the call is not NULL.
** RETURN:
**  void*               The value that should be used for the next call
**                      of the enumerator ('enumPtr'). The enumeration
**                      is ended if this value is NULL.
***********************************************************************/
NSPR_API(void *) PR_EnumerateAddrInfo(
    void *enumPtr, const PRAddrInfo *addrInfo, PRUint16 port, PRNetAddr *result);

/***********************************************************************
** FUNCTION:
** DESCRIPTION: PR_GetCanonNameFromAddrInfo()
**  Extracts the canonical name of the hostname passed to
**  PR_GetAddrInfoByName().
**
** INPUTS:
**  const PRAddrInfo *addrInfo
**                      The PRAddrInfo handle returned by a successful
**                      call to PR_GetAddrInfoByName().
** RETURN:
**  const char *        A const pointer to the canonical hostname stored
**                      in the given PRAddrInfo handle. This pointer is
**                      invalidated once the PRAddrInfo handle is destroyed
**                      by a call to PR_FreeAddrInfo().
***********************************************************************/
NSPR_API(const char *) PR_GetCanonNameFromAddrInfo(
    const PRAddrInfo *addrInfo);

/***********************************************************************
** FUNCTIONS: PR_ntohs, PR_ntohl, PR_ntohll, PR_htons, PR_htonl, PR_htonll
**
** DESCRIPTION: API entries for the common byte ordering routines.
**
**      PR_ntohs        16 bit conversion from network to host
**      PR_ntohl        32 bit conversion from network to host
**      PR_ntohll       64 bit conversion from network to host
**      PR_htons        16 bit conversion from host to network
**      PR_htonl        32 bit conversion from host to network
**      PR_ntonll       64 bit conversion from host to network
**
***********************************************************************/
NSPR_API(PRUint16) PR_ntohs(PRUint16);
NSPR_API(PRUint32) PR_ntohl(PRUint32);
NSPR_API(PRUint64) PR_ntohll(PRUint64);
NSPR_API(PRUint16) PR_htons(PRUint16);
NSPR_API(PRUint32) PR_htonl(PRUint32);
NSPR_API(PRUint64) PR_htonll(PRUint64);

PR_END_EXTERN_C

#endif /* prnetdb_h___ */