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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
#include <string.h>
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/signals.h>
#include "unixsupport.h"
#ifdef HAS_SOCKETS
#include "socketaddr.h"
#ifndef _WIN32
#include <sys/types.h>
#include <netdb.h>
#endif
#define NETDB_BUFFER_SIZE 10000
#ifdef _WIN32
#define GETHOSTBYADDR_IS_REENTRANT 1
#define GETHOSTBYNAME_IS_REENTRANT 1
#endif
static int entry_h_length;
extern int socket_domain_table[];
static value alloc_one_addr(char const *a)
{
struct in_addr addr;
#ifdef HAS_IPV6
struct in6_addr addr6;
if (entry_h_length == 16) {
memmove(&addr6, a, 16);
return alloc_inet6_addr(&addr6);
}
#endif
memmove (&addr, a, 4);
return alloc_inet_addr(&addr);
}
static value alloc_host_entry(struct hostent *entry)
{
value res;
value name = Val_unit, aliases = Val_unit;
value addr_list = Val_unit, adr = Val_unit;
Begin_roots4 (name, aliases, addr_list, adr);
name = copy_string((char *)(entry->h_name));
/* PR#4043: protect against buggy implementations of gethostbyname()
that return a NULL pointer in h_aliases */
if (entry->h_aliases)
aliases = copy_string_array((const char**)entry->h_aliases);
else
aliases = Atom(0);
entry_h_length = entry->h_length;
#ifdef h_addr
addr_list = alloc_array(alloc_one_addr, (const char**)entry->h_addr_list);
#else
adr = alloc_one_addr(entry->h_addr);
addr_list = alloc_small(1, 0);
Field(addr_list, 0) = adr;
#endif
res = alloc_small(4, 0);
Field(res, 0) = name;
Field(res, 1) = aliases;
switch (entry->h_addrtype) {
case PF_UNIX: Field(res, 2) = Val_int(0); break;
case PF_INET: Field(res, 2) = Val_int(1); break;
default: /*PF_INET6 */ Field(res, 2) = Val_int(2); break;
}
Field(res, 3) = addr_list;
End_roots();
return res;
}
CAMLprim value unix_gethostbyaddr(value a)
{
struct in_addr adr = GET_INET_ADDR(a);
struct hostent * hp;
#if HAS_GETHOSTBYADDR_R == 7
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int h_errnop;
enter_blocking_section();
hp = gethostbyaddr_r((char *) &adr, 4, AF_INET,
&h, buffer, sizeof(buffer), &h_errnop);
leave_blocking_section();
#elif HAS_GETHOSTBYADDR_R == 8
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int h_errnop, rc;
enter_blocking_section();
rc = gethostbyaddr_r((char *) &adr, 4, AF_INET,
&h, buffer, sizeof(buffer), &hp, &h_errnop);
leave_blocking_section();
if (rc != 0) hp = NULL;
#else
#ifdef GETHOSTBYADDR_IS_REENTRANT
enter_blocking_section();
#endif
hp = gethostbyaddr((char *) &adr, 4, AF_INET);
#ifdef GETHOSTBYADDR_IS_REENTRANT
leave_blocking_section();
#endif
#endif
if (hp == (struct hostent *) NULL) raise_not_found();
return alloc_host_entry(hp);
}
CAMLprim value unix_gethostbyname(value name)
{
struct hostent * hp;
char * hostname;
#if HAS_GETHOSTBYNAME_R
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int h_errno;
#endif
#if HAS_GETHOSTBYNAME_R || GETHOSTBYNAME_IS_REENTRANT
hostname = caml_strdup(String_val(name));
#else
hostname = String_val(name);
#endif
#if HAS_GETHOSTBYNAME_R == 5
{
enter_blocking_section();
hp = gethostbyname_r(hostname, &h, buffer, sizeof(buffer), &h_errno);
leave_blocking_section();
}
#elif HAS_GETHOSTBYNAME_R == 6
{
int rc;
enter_blocking_section();
rc = gethostbyname_r(hostname, &h, buffer, sizeof(buffer), &hp, &h_errno);
leave_blocking_section();
if (rc != 0) hp = NULL;
}
#else
#ifdef GETHOSTBYNAME_IS_REENTRANT
enter_blocking_section();
#endif
hp = gethostbyname(hostname);
#ifdef GETHOSTBYNAME_IS_REENTRANT
leave_blocking_section();
#endif
#endif
#if HAS_GETHOSTBYNAME_R || GETHOSTBYNAME_IS_REENTRANT
stat_free(hostname);
#endif
if (hp == (struct hostent *) NULL) raise_not_found();
return alloc_host_entry(hp);
}
#else
CAMLprim value unix_gethostbyaddr(value name)
{ invalid_argument("gethostbyaddr not implemented"); }
CAMLprim value unix_gethostbyname(value name)
{ invalid_argument("gethostbyname not implemented"); }
#endif
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