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* 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.

* 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().

#if 0

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <arpa/nameser.h>

#include <netdb.h>

#include <resolv.h>

#include <string.h>

#include <stddef.h>

#include "addrinfo.h"

#endif

#ifdef HAVE_NETDB_H

#define HAVE_GETNAMEINFO 1

#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 [] = {

#ifdef ENABLE_IPV6

{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 0

#define ENI_NOSERVNAME 1

#define ENI_NOHOSTNAME 2

#define ENI_MEMORY 3

#define ENI_SYSTEM 4

#define ENI_FAMILY 5

#define ENI_SALEN 6

int

getnameinfo(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;

#ifdef ENABLE_IPV6

u_char pfx;

int h_error;

#endif

char numserv[512];

char numaddr[512];

if (sa == NULL)

return ENI_NOSOCKET;

#ifdef 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) {

sprintf(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;

#ifdef ENABLE_IPV6

case AF_INET6:

pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[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 {

#ifdef ENABLE_IPV6

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);

#endif

if (hp) {

if (flags & NI_NOFQDN) {

p = strchr(hp->h_name, '.');

if (p) *p = '\0';

}

if (strlen(hp->h_name) > hostlen) {

#ifdef ENABLE_IPV6

freehostent(hp);

#endif

return ENI_MEMORY;

}

strcpy(host, hp->h_name);

#ifdef ENABLE_IPV6

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_NETDB_H

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