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su_addrinfo.c

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#include <sofia-sip/su.h>
#include <sofia-sip/su_addrinfo.h>

#ifndef IN_LOOPBACKNET
#define IN_LOOPBACKNET          127
#endif

#ifndef IN_EXPERIMENTAL
#define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
#endif

#if !HAVE_GETADDRINFO

#include <string.h>
#include <stddef.h>
#include <stdlib.h>
#include <ctype.h>

#ifndef EAI_NODATA
#define EAI_NODATA 7
#endif

/*
 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
 *
 * Issues to be discussed:
 * - Thread safe-ness must be checked.
 * - Return values.  There are nonstandard return values defined and used
 *   in the source code.  This is because RFC2133 is silent about which error
 *   code must be returned for which situation.
 * - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag.
 */

#if defined(__KAME__) && defined(INET6)
# define FAITH
#endif

#define SUCCESS 0
#define GAI_ANY 0
#define YES 1
#define NO  0

#undef SU_HAVE_IN6

#ifdef FAITH
static int translate = NO;
static struct in6_addr faith_prefix = IN6ADDR_GAI_ANY_INIT;
#endif

static const char in_addrany[] = { 0, 0, 0, 0 };
static const char in6_addrany[] = {
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

};
static const char in_loopback[] = { 127, 0, 0, 1 }; 
static const char in6_loopback[] = {
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
};

struct sockinet {
      u_char      si_len;
      u_char      si_family;
      u_short     si_port;
};

static struct gai_afd {
      int a_af;
      int a_addrlen;
      int a_socklen;
      int a_off;
      const char *a_addrany;
      const char *a_loopback; 
} gai_afdl [] = {
#if SU_HAVE_IN6
#define N_INET6 0
      {PF_INET6, sizeof(struct in6_addr),
       sizeof(struct sockaddr_in6),
       offsetof(struct sockaddr_in6, sin6_addr),
       in6_addrany, in6_loopback},
#define N_INET  1
#else
#define N_INET  0
#endif
      {PF_INET, sizeof(struct in_addr),
       sizeof(struct sockaddr_in),
       offsetof(struct sockaddr_in, sin_addr),
       in_addrany, in_loopback},
      {0, 0, 0, 0, NULL, NULL},
};

#if SU_HAVE_IN6
#define PTON_MAX  16
#else
#define PTON_MAX  4
#endif

#if SU_HAVE_IN6 && !defined(s6_addr8)
#  define s6_addr8 s6_addr
#endif

#if !SU_HAVE_IN6
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
#else
extern int h_errno;
#endif
#endif

static int get_name(const char *, struct gai_afd *,
                struct addrinfo **, char *, struct addrinfo *,
                int);
static int get_addr(const char *, int, struct addrinfo **,
                struct addrinfo *, int);
static int str_isnumber(const char *);
      
#define GET_CANONNAME(ai, str) \
if (pai->ai_flags & AI_CANONNAME) {\
      if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
            strcpy((ai)->ai_canonname, (str));\
      } else {\
            error = EAI_MEMORY;\
            goto free;\
      }\
}

#if SU_HAVE_SOCKADDR_SA_LEN
#define GET_AI(ai, gai_afd, addr, port) {\
      char *p;\
      if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
                                    ((gai_afd)->a_socklen)))\
          == NULL) goto free;\
      memcpy(ai, pai, sizeof(struct addrinfo));\
      (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
      memset((ai)->ai_addr, 0, (gai_afd)->a_socklen);\
      (ai)->ai_addr->sa_len = (ai)->ai_addrlen = (gai_afd)->a_socklen;\
      (ai)->ai_addr->sa_family = (ai)->ai_family = (gai_afd)->a_af;\
      ((struct sockinet *)(ai)->ai_addr)->si_port = port;\
      p = (char *)((ai)->ai_addr);\
      memcpy(p + (gai_afd)->a_off, (addr), (gai_afd)->a_addrlen);\
}
#else
#define GET_AI(ai, gai_afd, addr, port) {\
      char *p;\
      if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
                                    ((gai_afd)->a_socklen)))\
          == NULL) goto free;\
      memcpy(ai, pai, sizeof(struct addrinfo));\
      (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
      memset((ai)->ai_addr, 0, (gai_afd)->a_socklen);\
      (ai)->ai_addrlen = (gai_afd)->a_socklen; \
      (ai)->ai_addr->sa_family = (ai)->ai_family = (gai_afd)->a_af;\
      ((struct sockinet *)(ai)->ai_addr)->si_port = port;\
      p = (char *)((ai)->ai_addr);\
      memcpy(p + (gai_afd)->a_off, (addr), (gai_afd)->a_addrlen);\
}
#endif

#define ERR(err) { error = (err); goto bad; }

static int
str_isnumber(p)
      const char *p;
{
      char *q = (char *)p;
      while (*q) {
            if (! isdigit(*q))
                  return NO;
            q++;
      }
      return YES;
}

static
int
getaddrinfo(hostname, servname, hints, res)
      const char *hostname, *servname;
      const struct addrinfo *hints;
      struct addrinfo **res;
{
      struct addrinfo sentinel;
      struct addrinfo *top = NULL;
      struct addrinfo *cur;
      int i, error = 0;
      char pton[PTON_MAX];
      struct addrinfo ai;
      struct addrinfo *pai;
      u_short port;

#ifdef FAITH
      static int firsttime = 1;

      if (firsttime) {
            /* translator hack */
            {
                  char *q = getenv("GAI");
                  if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
                        translate = YES;
            }
            firsttime = 0;
      }
#endif

      /* initialize file static vars */
      sentinel.ai_next = NULL;
      cur = &sentinel;
      pai = &ai;
      pai->ai_flags = 0;
      pai->ai_family = PF_UNSPEC;
      pai->ai_socktype = GAI_ANY;
      pai->ai_protocol = GAI_ANY;
      pai->ai_addrlen = 0;
      pai->ai_canonname = NULL;
      pai->ai_addr = NULL;
      pai->ai_next = NULL;
      port = GAI_ANY;
      
      if (hostname == NULL && servname == NULL)
            return EAI_NONAME;
      if (hints) {
            /* error check for hints */
            if (hints->ai_addrlen || hints->ai_canonname ||
                hints->ai_addr || hints->ai_next)
                  ERR(EAI_BADHINTS); /* xxx */
            if (hints->ai_flags & ~AI_MASK)
                  ERR(EAI_BADFLAGS);
            switch (hints->ai_family) {
            case PF_UNSPEC:
            case PF_INET:
#if SU_HAVE_IN6
            case PF_INET6:
#endif
                  break;
            default:
                  ERR(EAI_FAMILY);
            }
            memcpy(pai, hints, sizeof(*pai));
            switch (pai->ai_socktype) {
            case GAI_ANY:
                  switch (pai->ai_protocol) {
                  case GAI_ANY:
                        break;
                  case IPPROTO_UDP:
                        pai->ai_socktype = SOCK_DGRAM;
                        break;
                  case IPPROTO_TCP:
                        pai->ai_socktype = SOCK_STREAM;
                        break;
#if HAVE_SCTP
                  case IPPROTO_SCTP:
                        pai->ai_socktype = SOCK_STREAM;
                        break;
#endif
                  default:
                        pai->ai_socktype = SOCK_RAW;
                        break;
                  }
                  break;
            case SOCK_RAW:
                  break;
            case SOCK_DGRAM:
                  if (pai->ai_protocol != IPPROTO_UDP &&
#if HAVE_SCTP
                      pai->ai_protocol != IPPROTO_SCTP &&
#endif
                      pai->ai_protocol != GAI_ANY)
                        ERR(EAI_BADHINTS);      /*xxx*/
                  if (pai->ai_protocol == GAI_ANY)
                        pai->ai_protocol = IPPROTO_UDP;
                  break;
            case SOCK_STREAM:
                  if (pai->ai_protocol != IPPROTO_TCP &&
#if HAVE_SCTP
                      pai->ai_protocol != IPPROTO_SCTP &&
#endif
                      pai->ai_protocol != GAI_ANY)
                        ERR(EAI_BADHINTS);      /*xxx*/
                  if (pai->ai_protocol == GAI_ANY)
                        pai->ai_protocol = IPPROTO_TCP;
                  break;
#if HAVE_SCTP
            case SOCK_SEQPACKET:
                  if (pai->ai_protocol != IPPROTO_SCTP &&
                      pai->ai_protocol != GAI_ANY)
                        ERR(EAI_BADHINTS);      /*xxx*/

                  if (pai->ai_protocol == GAI_ANY)
                        pai->ai_protocol = IPPROTO_SCTP;
                  break;
#endif
            default:
                  ERR(EAI_SOCKTYPE);
                  break;
            }
      }

      /*
       * service port
       */
      if (servname) {
            if (str_isnumber(servname)) {
                  if (pai->ai_socktype == GAI_ANY) {
                        /* caller accept *GAI_ANY* socktype */
                        pai->ai_socktype = SOCK_DGRAM;
                        pai->ai_protocol = IPPROTO_UDP;
                  }
                  port = htons(atoi(servname));
            } else {
                  struct servent *sp;
                  char *proto;

                  proto = NULL;
                  switch (pai->ai_socktype) {
                  case GAI_ANY:
                        proto = NULL;
                        break;
                  case SOCK_DGRAM:
                        proto = "udp";
                        break;
                  case SOCK_STREAM:
                        proto = "tcp";
                        break;
                  default:
                        fprintf(stderr, "panic!\n");
                        break;
                  }
                  if ((sp = getservbyname(servname, proto)) == NULL)
                        ERR(EAI_SERVICE);
                  port = sp->s_port;
                  if (pai->ai_socktype == GAI_ANY) {
                        if (strcmp(sp->s_proto, "udp") == 0) {
                              pai->ai_socktype = SOCK_DGRAM;
                              pai->ai_protocol = IPPROTO_UDP;
                        } else if (strcmp(sp->s_proto, "tcp") == 0) {
                              pai->ai_socktype = SOCK_STREAM;
                              pai->ai_protocol = IPPROTO_TCP;
#if HAVE_SCTP
                        } else if (strcmp(sp->s_proto, "sctp") == 0) {
                              pai->ai_socktype = SOCK_STREAM;
                              pai->ai_protocol = IPPROTO_SCTP;
#endif
                        } else
                              ERR(EAI_PROTOCOL);      /*xxx*/
                  }
            }
      }
      
      /*
       * hostname == NULL.
       * passive socket -> anyaddr (0.0.0.0 or ::)
       * non-passive socket -> localhost (127.0.0.1 or ::1)
       */
      if (hostname == NULL) {
            struct gai_afd *gai_afd;

            for (gai_afd = &gai_afdl[0]; gai_afd->a_af; gai_afd++) {
                  if (!(pai->ai_family == PF_UNSPEC
                     || pai->ai_family == gai_afd->a_af)) {
                        continue;
                  }

                  if (pai->ai_flags & AI_PASSIVE) {
                        GET_AI(cur->ai_next, gai_afd, gai_afd->a_addrany, port);
                        /* xxx meaningless?
                         * GET_CANONNAME(cur->ai_next, "anyaddr");
                         */
                  } else {
                        GET_AI(cur->ai_next, gai_afd, gai_afd->a_loopback,
                              port);
                        /* xxx meaningless?
                         * GET_CANONNAME(cur->ai_next, "localhost");
                         */
                  }
                  cur = cur->ai_next;
            }
            top = sentinel.ai_next;
            if (top)
                  goto good;
            else
                  ERR(EAI_FAMILY);
      }
      
      /* hostname as numeric name */
      for (i = 0; gai_afdl[i].a_af; i++) {
            if (inet_pton(gai_afdl[i].a_af, hostname, pton)) {
                  u_long v4a;
                  u_char pfx;

                  switch (gai_afdl[i].a_af) {
                  case AF_INET:
                        v4a = ((struct in_addr *)pton)->s_addr;
                        if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
                              pai->ai_flags &= ~AI_CANONNAME;
                        v4a >>= IN_CLASSA_NSHIFT;
                        if (v4a == 0 || v4a == IN_LOOPBACKNET)
                              pai->ai_flags &= ~AI_CANONNAME;
                        break;
#if SU_HAVE_IN6
                  case AF_INET6:
                        pfx = ((struct in6_addr *)pton)->s6_addr8[0];
                        if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
                              pai->ai_flags &= ~AI_CANONNAME;
                        break;
#endif
                  }
                  
                  if (pai->ai_family == gai_afdl[i].a_af ||
                      pai->ai_family == PF_UNSPEC) {
                        if (! (pai->ai_flags & AI_CANONNAME)) {
                              GET_AI(top, &gai_afdl[i], pton, port);
                              goto good;
                        }
                        /*
                         * if AI_CANONNAME and if reverse lookup
                         * fail, return ai anyway to pacify
                         * calling application.
                         *
                         * XXX getaddrinfo() is a name->address
                         * translation function, and it looks strange
                         * that we do addr->name translation here.
                         */
                        get_name(pton, &gai_afdl[i], &top, pton, pai, port);
                        goto good;
                  } else 
                        ERR(EAI_FAMILY);  /*xxx*/
            }
      }

      if (pai->ai_flags & AI_NUMERICHOST)
            ERR(EAI_NONAME);

      /* hostname as alphabetical name */
      error = get_addr(hostname, pai->ai_family, &top, pai, port);
      if (error == 0) {
            if (top) {
 good:
                  *res = top;
                  return SUCCESS;
            } else
                  error = EAI_FAIL;
      }
 free:
      if (top)
            freeaddrinfo(top);
 bad:
      *res = NULL;
      return error;
}

static int
get_name(addr, gai_afd, res, numaddr, pai, port0)
      const char *addr;
      struct gai_afd *gai_afd;
      struct addrinfo **res;
      char *numaddr;
      struct addrinfo *pai;
      int port0;
{
      u_short port = port0 & 0xffff;
      struct hostent *hp;
      struct addrinfo *cur;
      int error = 0, h_error;
      
#if SU_HAVE_IN6
      hp = getipnodebyaddr(addr, gai_afd->a_addrlen, gai_afd->a_af, &h_error);
#else
      hp = gethostbyaddr(addr, gai_afd->a_addrlen, AF_INET);
#endif
      if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
            GET_AI(cur, gai_afd, hp->h_addr_list[0], port);
            GET_CANONNAME(cur, hp->h_name);
      } else
            GET_AI(cur, gai_afd, numaddr, port);
      
#if SU_HAVE_IN6
      if (hp)
            freehostent(hp);
#endif
      *res = cur;
      return SUCCESS;
 free:
      if (cur)
            freeaddrinfo(cur);
#if SU_HAVE_IN6
      if (hp)
            freehostent(hp);
#endif
 /* bad: */
      *res = NULL;
      return error;
}

static int
get_addr(hostname, af, res, pai, port0)
      const char *hostname;
      int af;
      struct addrinfo **res;
      struct addrinfo *pai;
      int port0;
{
      u_short port = port0 & 0xffff;
      struct addrinfo sentinel;
      struct hostent *hp;
      struct addrinfo *top, *cur;
      struct gai_afd *gai_afd;
      int i, error = 0, h_error;
      char *ap;

      top = NULL;
      sentinel.ai_next = NULL;
      cur = &sentinel;
#if SU_HAVE_IN6
      if (af == AF_UNSPEC) {
            hp = getipnodebyname(hostname, AF_INET6,
                        AI_ADDRCONFIG|AI_ALL|AI_V4MAPPED, &h_error);
      } else
            hp = getipnodebyname(hostname, af, AI_ADDRCONFIG, &h_error);
#else
      hp = gethostbyname(hostname);
      h_error = h_errno;
#endif
      if (hp == NULL) {
            switch (h_error) {
            case HOST_NOT_FOUND:
            case NO_DATA:
                  error = EAI_NODATA;
                  break;
            case TRY_AGAIN:
                  error = EAI_AGAIN;
                  break;
            case NO_RECOVERY:
            default:
                  error = EAI_FAIL;
                  break;
            }
            goto bad;
      }

      if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
          (hp->h_addr_list[0] == NULL))
            ERR(EAI_FAIL);
      
      for (i = 0; (ap = hp->h_addr_list[i]) != NULL; i++) {
            switch (af) {
#if SU_HAVE_IN6
            case AF_INET6:
                  gai_afd = &gai_afdl[N_INET6];
                  break;
#endif
#ifndef INET6
            default:    /* AF_UNSPEC */
#endif
            case AF_INET:
                  gai_afd = &gai_afdl[N_INET];
                  break;
#if SU_HAVE_IN6
            default:    /* AF_UNSPEC */
                  if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
                        ap += sizeof(struct in6_addr) -
                              sizeof(struct in_addr);
                        gai_afd = &gai_afdl[N_INET];
                  } else
                        gai_afd = &gai_afdl[N_INET6];
                  break;
#endif
            }
#ifdef FAITH
            if (translate && gai_afd->a_af == AF_INET) {
                  struct in6_addr *in6;

                  GET_AI(cur->ai_next, &gai_afdl[N_INET6], ap, port);
                  in6 = &((struct sockaddr_in6 *)cur->ai_next->ai_addr)->sin6_addr;
                  memcpy(&in6->s6_addr32[0], &faith_prefix,
                      sizeof(struct in6_addr) - sizeof(struct in_addr));
                  memcpy(&in6->s6_addr32[3], ap, sizeof(struct in_addr));
            } else
#endif /* FAITH */
            GET_AI(cur->ai_next, gai_afd, ap, port);
            if (cur == &sentinel) {
                  top = cur->ai_next;
                  GET_CANONNAME(top, hp->h_name);
            }
            cur = cur->ai_next;
      }
#if SU_HAVE_IN6
      freehostent(hp);
#endif
      *res = top;
      return SUCCESS;
 free:
      if (top)
            freeaddrinfo(top);
#if SU_HAVE_IN6
      if (hp)
            freehostent(hp);
#endif
 bad:
      *res = NULL;
      return error;
}

/*
 * Issues to be discussed:
 * - Thread safe-ness must be checked
 * - Return values.  There seems to be no standard for return value (RFC2133)
 *   but INRIA implementation returns EAI_xxx defined for getaddrinfo().
 */

#define SUCCESS 0
#define YES 1
#define NO  0

static struct gni_afd {
      int a_af;
      int a_addrlen;
      int a_socklen;
      int a_off;
} gni_afdl [] = {
#if SU_HAVE_IN6
      {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
            offsetof(struct sockaddr_in6, sin6_addr)},
#endif
      {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
            offsetof(struct sockaddr_in, sin_addr)},
      {0, 0, 0},
};

struct gni_sockinet {
      u_char      si_len;
      u_char      si_family;
      u_short     si_port;
};

#define ENI_NOSOCKET    EAI_FAIL
#define ENI_NOSERVNAME  EAI_NONAME
#define ENI_NOHOSTNAME  EAI_NONAME
#define ENI_MEMORY      EAI_MEMORY
#define ENI_SYSTEM      EAI_SYSTEM
#define ENI_FAMILY      EAI_FAMILY
#define ENI_SALEN EAI_MEMORY

static
int
getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
      const struct sockaddr *sa;
      size_t salen;
      char *host;
      size_t hostlen;
      char *serv;
      size_t servlen;
      int flags;
{
      struct gni_afd *gni_afd;
      struct servent *sp;
      struct hostent *hp;
      u_short port;
      int family, len, i;
      char *addr, *p;
      u_long v4a;
      u_char pfx;
      int h_error;
      char numserv[512];
      char numaddr[512];

      if (sa == NULL)
            return ENI_NOSOCKET;

#if SU_HAVE_SOCKADDR_SA_LEN
      len = sa->sa_len;
      if (len != salen) return ENI_SALEN;
#else
      len = salen;
#endif
      
      family = sa->sa_family;
      for (i = 0; gni_afdl[i].a_af; i++)
            if (gni_afdl[i].a_af == family) {
                  gni_afd = &gni_afdl[i];
                  goto found;
            }
      return ENI_FAMILY;
      
 found:
      if (len != gni_afd->a_socklen) return ENI_SALEN;
      
      port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */
      addr = (char *)sa + gni_afd->a_off;

      if (serv == NULL || servlen == 0) {
            /* what we should do? */
      } else if (flags & NI_NUMERICSERV) {
            snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
            if (strlen(numserv) > servlen)
                  return ENI_MEMORY;
            strcpy(serv, numserv);
      } else {
            sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
            if (sp) {
                  if (strlen(sp->s_name) > servlen)
                        return ENI_MEMORY;
                  strcpy(serv, sp->s_name);
            } else
                  return ENI_NOSERVNAME;
      }

      switch (sa->sa_family) {
      case AF_INET:
            v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
            if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
                  flags |= NI_NUMERICHOST;
            v4a >>= IN_CLASSA_NSHIFT;
            if (v4a == 0 || v4a == IN_LOOPBACKNET)
                  flags |= NI_NUMERICHOST;                  
            break;
#if SU_HAVE_IN6
      case AF_INET6:
            pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0];
            if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
                  flags |= NI_NUMERICHOST;
            break;
#endif
      }
      if (host == NULL || hostlen == 0) {
            /* what should we do? */
      } else if (flags & NI_NUMERICHOST) {
            if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
                == NULL)
                  return ENI_SYSTEM;
            if (strlen(numaddr) > hostlen)
                  return ENI_MEMORY;
            strcpy(host, numaddr);
      } else {
#if SU_HAVE_IN6
            hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);
#else
            hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);
            h_error = h_errno;
#endif

            if (hp) {
                  if (flags & NI_NOFQDN) {
                        p = strchr(hp->h_name, '.');
                        if (p) *p = '\0';
                  }
                  if (strlen(hp->h_name) > hostlen) {
#if SU_HAVE_IN6
                        freehostent(hp);
#endif
                        return ENI_MEMORY;
                  }
                  strcpy(host, hp->h_name);
#if SU_HAVE_IN6
                  freehostent(hp);
#endif
            } else {
                  if (flags & NI_NAMEREQD)
                        return ENI_NOHOSTNAME;
                  if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
                      == NULL)
                        return ENI_NOHOSTNAME;
                  if (strlen(numaddr) > hostlen)
                        return ENI_MEMORY;
                  strcpy(host, numaddr);
            }
      }
      return SUCCESS;
}

#endif      /* !HAVE_GETNAMEINFO */

#if !HAVE_FREEADDRINFO
static 
void
freeaddrinfo(ai)
      struct addrinfo *ai;
{
      struct addrinfo *next;

      do {
            next = ai->ai_next;
            if (ai->ai_canonname)
                  free(ai->ai_canonname);
            /* no need to free(ai->ai_addr) */
            free(ai);
      } while ((ai = next) != NULL);
}
#endif

#if !HAVE_GAI_STRERROR
static 
char *
gai_strerror(ecode)
      int ecode;
{
  switch (ecode) {
  case 0: 
    return "success.";
#if defined(EAI_ADDRFAMILY)
  case EAI_ADDRFAMILY:
    return "address family for hostname not supported.";
#endif
#if defined(EAI_AGAIN)
  case EAI_AGAIN:
    return "temporary failure in name resolution.";
#endif
#if defined(EAI_BADFLAGS)
  case EAI_BADFLAGS:
    return "invalid value for ai_flags.";
#endif
#if defined(EAI_FAIL)
  case EAI_FAIL:
    return "non-recoverable failure in name resolution.";
#endif
#if defined(EAI_FAMILY)
  case EAI_FAMILY:
    return "ai_family not supported.";
#endif
#if defined(EAI_MEMORY)
  case EAI_MEMORY:
    return "memory allocation failure.";
#endif
#if defined(EAI_NODATA)
  case EAI_NODATA:
    return "no address associated with hostname.";
#endif
#if defined(EAI_NONAME)
  case EAI_NONAME:
    return "hostname nor servname provided, or not known.";
#endif
#if defined(EAI_SERVICE)
  case EAI_SERVICE:
    return "servname not supported for ai_socktype.";
#endif
#if defined(EAI_SOCKTYPE)
  case EAI_SOCKTYPE:
    return "ai_socktype not supported.";
#endif
#if defined(EAI_SYSTEM)
  case EAI_SYSTEM:
    return "system error returned in errno.";
#endif
#if defined(EAI_BADHINTS)
  case EAI_BADHINTS:
    return "invalid value for hints.";
#endif
#if defined(EAI_PROTOCOL)
  case EAI_PROTOCOL:
    return "resolved protocol is unknown.";
#endif
  default:
    return "unknown error.";
  }
}
#endif


/** Translate address and service.
 *
 * This is a getaddrinfo() supporting SCTP and other exotic protocols.
 */
00890 int su_getaddrinfo(char const *node, char const *service,
               su_addrinfo_t const *hints,
               su_addrinfo_t **res)
{
  int retval;
  su_addrinfo_t *ai;

  if (!service || service[0] == '\0')
    service = "0";

#if HAVE_SCTP
  if (res && hints && hints->ai_protocol == IPPROTO_SCTP) {
    su_addrinfo_t system_hints[1];
    int socktype;

    socktype = hints->ai_socktype;
    
    if (!(socktype == 0 ||
        socktype == SOCK_SEQPACKET ||
        socktype == SOCK_STREAM ||
        socktype == SOCK_DGRAM))
      return EAI_SOCKTYPE;

    *system_hints = *hints;
    system_hints->ai_protocol = IPPROTO_TCP;
    system_hints->ai_socktype = SOCK_STREAM;

    retval = getaddrinfo(node, service, system_hints, res);
    if (retval)
      return retval;

    if (socktype == 0)
      socktype = SOCK_STREAM;

    for (ai = *res; ai; ai = ai->ai_next) {
      ai->ai_protocol = IPPROTO_SCTP;
      ai->ai_socktype = socktype;
    }

    return 0;
  }
#endif

  retval = getaddrinfo(node, service, hints, res);

  if (retval == 0) {
    for (ai = *res; ai; ai = ai->ai_next) {
      if (ai->ai_protocol)
      continue;

      if (hints && hints->ai_protocol) {
      ai->ai_protocol = hints->ai_protocol;
      continue;
      }

      if (ai->ai_family != AF_INET 
#if SU_HAVE_IN6
        && ai->ai_family != AF_INET6
#endif
        ) continue;

      if (ai->ai_socktype == SOCK_STREAM)
      ai->ai_protocol = IPPROTO_TCP;
      else if (ai->ai_socktype == SOCK_DGRAM)
      ai->ai_protocol = IPPROTO_UDP;
    }
  }
  return retval;
}

/** Free su_addrinfo_t structure allocated by su_getaddrinfo(). */
00961 void su_freeaddrinfo(su_addrinfo_t *res)
{
  freeaddrinfo(res);
}

/** Return string describing address translation error. */
00967 char const *su_gai_strerror(int errcode)
{
      return (char const *)gai_strerror(errcode);
}

/** Resolve socket address into hostname and service name.
 *
 * @note
 * This function uses now @RFC2133 prototype. The @RFC3493 redefines the
 * prototype as well as ai_addrlen to use socklen_t instead of size_t.
 * If your application allocates more than 2 gigabytes for resolving the
 * hostname, you probably lose.
 */
int
su_getnameinfo(const su_sockaddr_t *su, size_t sulen,
             char *return_host, size_t hostlen,
             char *return_serv, size_t servlen,
             int flags)
{
  return getnameinfo(&su->su_sa, (socklen_t)sulen,
                 return_host, (socklen_t)hostlen, 
                 return_serv, (socklen_t)servlen, 
                 flags);
}

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