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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 Lesser General Public License version 2.1, with the */
/* special exception on linking described in the 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 value alloc_one_addr_4(char const *a)
{
return caml_alloc_initialized_string(4, a);
}
static value alloc_one_addr_16(char const *a)
{
return caml_alloc_initialized_string(16, a);
}
static value alloc_host_entry(struct hostent *entry)
{
CAMLparam0();
CAMLlocal4(name, aliases, addr_list, adr);
value (*alloc_one_addr)(char const *);
value res;
name = caml_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 = caml_copy_string_array((const char**)entry->h_aliases);
else
aliases = Atom(0);
if (entry->h_length == 16) {
alloc_one_addr = &alloc_one_addr_16;
} else {
CAMLassert(entry->h_length == 4);
alloc_one_addr = &alloc_one_addr_4;
}
addr_list =
caml_alloc_array(alloc_one_addr, (const char**)entry->h_addr_list);
res = caml_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;
CAMLreturn(res);
}
CAMLprim value caml_unix_gethostbyaddr(value a)
{
char * adr;
struct in_addr in4;
struct hostent * hp;
int addr_type = AF_INET;
socklen_t addr_len = 4;
#if HAS_IPV6
struct in6_addr in6;
if (caml_string_length(a) == 16) {
addr_type = AF_INET6;
addr_len = 16;
in6 = GET_INET6_ADDR(a);
adr = (char *)&in6;
} else {
#endif
in4 = GET_INET_ADDR(a);
adr = (char *)&in4;
#if HAS_IPV6
}
#endif
#if HAS_GETHOSTBYADDR_R == 7
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int h_errnop;
caml_enter_blocking_section();
hp = gethostbyaddr_r(adr, addr_len, addr_type,
&h, buffer, sizeof(buffer), &h_errnop);
caml_leave_blocking_section();
#elif HAS_GETHOSTBYADDR_R == 8
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int h_errnop, rc;
caml_enter_blocking_section();
rc = gethostbyaddr_r(adr, addr_len, addr_type,
&h, buffer, sizeof(buffer), &hp, &h_errnop);
caml_leave_blocking_section();
if (rc != 0) hp = NULL;
#else
#ifdef GETHOSTBYADDR_IS_REENTRANT
caml_enter_blocking_section();
#endif
hp = gethostbyaddr(adr, addr_len, addr_type);
#ifdef GETHOSTBYADDR_IS_REENTRANT
caml_leave_blocking_section();
#endif
#endif
if (hp == (struct hostent *) NULL) caml_raise_not_found();
return alloc_host_entry(hp);
}
CAMLprim value caml_unix_gethostbyname(value name)
{
struct hostent * hp;
char * hostname;
#if HAS_GETHOSTBYNAME_R
struct hostent h;
char buffer[NETDB_BUFFER_SIZE];
int err;
#endif
if (! caml_string_is_c_safe(name)) caml_raise_not_found();
hostname = caml_stat_strdup(String_val(name));
#if HAS_GETHOSTBYNAME_R == 5
{
caml_enter_blocking_section();
hp = gethostbyname_r(hostname, &h, buffer, sizeof(buffer), &err);
caml_leave_blocking_section();
}
#elif HAS_GETHOSTBYNAME_R == 6
{
int rc;
caml_enter_blocking_section();
rc = gethostbyname_r(hostname, &h, buffer, sizeof(buffer), &hp, &err);
caml_leave_blocking_section();
if (rc != 0) hp = NULL;
}
#else
#ifdef GETHOSTBYNAME_IS_REENTRANT
caml_enter_blocking_section();
#endif
hp = gethostbyname(hostname);
#ifdef GETHOSTBYNAME_IS_REENTRANT
caml_leave_blocking_section();
#endif
#endif
caml_stat_free(hostname);
if (hp == (struct hostent *) NULL) caml_raise_not_found();
return alloc_host_entry(hp);
}
#else
CAMLprim value caml_unix_gethostbyaddr(value name)
{ caml_invalid_argument("gethostbyaddr not implemented"); }
CAMLprim value caml_unix_gethostbyname(value name)
{ caml_invalid_argument("gethostbyname not implemented"); }
#endif
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