methods/rfc2553emu.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: rfc2553emu.h,v 1.4 2000/06/18 06:04:45 jgg Exp $
   4 /* ######################################################################
   5
   6    RFC 2553 Emulation - Provides emulation for RFC 2553 getaddrinfo,
   7                         freeaddrinfo and getnameinfo
   8
   9    These functions are necessary to write portable protocol independent
  10    networking. They transparently support IPv4, IPv6 and probably many
  11    other protocols too. This implementation is needed when the host does
  12    not support these standards. It implements a simple wrapper that
  13    basically supports only IPv4.
  14
  15    Perfect emulation is not provided, but it is passable..
  16
  17    Originally written by Jason Gunthorpe <jgg@debian.org> and placed into
  18    the Public Domain, do with it what you will.
  19
  20    ##################################################################### */
  21                                                                         /*}}}*/
  22 #ifndef RFC2553EMU_H
  23 #define RFC2553EMU_H
  24
  25 #include <netdb.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28
  29 // Autosense getaddrinfo
  30 #if defined(AI_PASSIVE) && defined(EAI_NONAME)
  31 #define HAVE_GETADDRINFO
  32 #endif
  33
  34 // Autosense getnameinfo
  35 #if defined(NI_NUMERICHOST)
  36 #define HAVE_GETNAMEINFO
  37 #endif
  38
  39 // getaddrinfo support?
  40 #ifndef HAVE_GETADDRINFO
  41   // Renamed to advoid type clashing.. (for debugging)
  42   struct addrinfo_emu
  43   {
  44      int     ai_flags;     /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
  45      int     ai_family;    /* PF_xxx */
  46      int     ai_socktype;  /* SOCK_xxx */
  47      int     ai_protocol;  /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
  48      size_t  ai_addrlen;   /* length of ai_addr */
  49      char   *ai_canonname; /* canonical name for nodename */
  50      struct sockaddr  *ai_addr; /* binary address */
  51      struct addrinfo_emu  *ai_next; /* next structure in linked list */
  52   };
  53   #define addrinfo addrinfo_emu
  54
  55   int getaddrinfo(const char *nodename, const char *servname,
  56                   const struct addrinfo *hints,
  57                   struct addrinfo **res);
  58   void freeaddrinfo(struct addrinfo *ai);
  59
  60   #ifndef AI_PASSIVE
  61   #define AI_PASSIVE (1<<1)
  62   #endif
  63
  64   #ifndef EAI_NONAME
  65   #define EAI_NONAME     -1
  66   #define EAI_AGAIN      -2
  67   #define EAI_FAIL       -3
  68   #define EAI_NODATA     -4
  69   #define EAI_FAMILY     -5
  70   #define EAI_SOCKTYPE   -6
  71   #define EAI_SERVICE    -7
  72   #define EAI_ADDRFAMILY -8
  73   #define EAI_SYSTEM     -10
  74   #define EAI_MEMORY     -11
  75   #endif
  76
  77   /* If we don't have getaddrinfo then we probably don't have
  78      sockaddr_storage either (same RFC) so we definately will not be
  79      doing any IPv6 stuff. Do not use the members of this structure to
  80      retain portability, cast to a sockaddr. */
  81   #define sockaddr_storage sockaddr_in
  82 #endif
  83
  84 // getnameinfo support (glibc2.0 has getaddrinfo only)
  85 #ifndef HAVE_GETNAMEINFO
  86
  87   int getnameinfo(const struct sockaddr *sa, socklen_t salen,
  88                   char *host, size_t hostlen,
  89                   char *serv, size_t servlen,
  90                   int flags);
  91
  92   #ifndef NI_MAXHOST
  93   #define NI_MAXHOST 1025
  94   #define NI_MAXSERV 32
  95   #endif
  96
  97   #ifndef NI_NUMERICHOST
  98   #define NI_NUMERICHOST (1<<0)
  99   #define NI_NUMERICSERV (1<<1)
 100 //  #define NI_NOFQDN (1<<2)
 101   #define NI_NAMEREQD (1<<3)
 102   #define NI_DATAGRAM (1<<4)
 103   #endif
 104
 105   #define sockaddr_storage sockaddr_in
 106 #endif
 107
 108 // Glibc 2.0.7 misses this one
 109 #ifndef AI_NUMERICHOST
 110 #define AI_NUMERICHOST 0
 111 #endif
 112
 113 #endif