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|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2018-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*
* ----------------------------------------------------------------------
* Purpose : The NIF (C) part of the net interface
* This is a module of miscellaneous functions.
* ----------------------------------------------------------------------
*
*/
#define STATIC_ERLANG_NIF 1
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* If we HAVE_SCTP_H and Solaris, we need to define the following in
* order to get SCTP working:
*/
#if (defined(HAVE_SCTP_H) && defined(__sun) && defined(__SVR4))
#define SOLARIS10 1
/* WARNING: This is not quite correct, it may also be Solaris 11! */
#define _XPG4_2
#define __EXTENSIONS__
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#include <sys/types.h>
#include <errno.h>
#include <netinet/ip.h>
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif
#ifdef HAVE_IFADDRS_H
#include <ifaddrs.h>
#endif
#ifdef HAVE_NETPACKET_PACKET_H
#include <netpacket/packet.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
/* SENDFILE STUFF HERE IF WE NEED IT... */
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
#define __DARWIN__ 1
#endif
#ifdef __WIN32__
#define STRNCASECMP strncasecmp
#define INCL_WINSOCK_API_TYPEDEFS 1
#ifndef WINDOWS_H_INCLUDES_WINSOCK2_H
#include <winsock2.h>
#endif
#include <windows.h>
#include <Ws2tcpip.h> /* NEED VC 6.0 or higher */
/* Visual studio 2008+: NTDDI_VERSION needs to be set for iphlpapi.h
* to define the right structures. It needs to be set to WINXP (or LONGHORN)
* for IPV6 to work and it's set lower by default, so we need to change it.
*/
#ifdef HAVE_SDKDDKVER_H
# include <sdkddkver.h>
# ifdef NTDDI_VERSION
# undef NTDDI_VERSION
# endif
# define NTDDI_VERSION NTDDI_WINXP
#endif
#include <iphlpapi.h>
#undef WANT_NONBLOCKING
#include "sys.h"
#else /* !__WIN32__ */
#include <sys/time.h>
#ifdef NETDB_H_NEEDS_IN_H
#include <netinet/in.h>
#endif
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef DEF_INADDR_LOOPBACK_IN_RPC_TYPES_H
#include <rpc/types.h>
#endif
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <arpa/inet.h>
#include <sys/param.h>
#ifdef HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <net/if.h>
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#ifdef HAVE_SETNS_H
#include <setns.h>
#endif
#define HAVE_UDP
#ifndef WANT_NONBLOCKING
#define WANT_NONBLOCKING
#endif
#include "sys.h"
#endif
#include <erl_nif.h>
#include "socket_dbg.h"
#include "socket_int.h"
#include "socket_util.h"
/* All platforms fail on malloc errors. */
#define FATAL_MALLOC
#ifdef __WIN32__
#define net_gethostname(__buf__, __bufSz__) gethostname((__buf__), (__bufSz__))
#else
#define net_gethostname(__buf__, __bufSz__) gethostname((__buf__), (__bufSz__))
#endif // __WIN32__
/* *** Misc macros and defines *** */
#ifdef __WIN32__
#define get_errno() WSAGetLastError()
#else
#define get_errno() errno
#endif
#define HOSTNAME_LEN 256
#define SERVICE_LEN 256
/* MAXHOSTNAMELEN could be 64 or 255 depending
* on the platform. Instead, use INET_MAXHOSTNAMELEN
* which is always 255 across all platforms
*/
#define NET_MAXHOSTNAMELEN 255
/* =================================================================== *
* *
* Various enif macros *
* *
* =================================================================== */
#ifdef HAVE_SOCKLEN_T
# define SOCKLEN_T socklen_t
#else
# define SOCKLEN_T size_t
#endif
#define NDBG( proto ) ESOCK_DBG_PRINTF( data.debug , proto )
typedef struct {
BOOLEAN_T debug;
} NetData;
/* =================================================================== *
* *
* Static data *
* *
* =================================================================== */
static NetData data;
/* ----------------------------------------------------------------------
* F o r w a r d s
* ----------------------------------------------------------------------
*/
/* THIS IS JUST TEMPORARY */
extern char* erl_errno_id(int error);
static ERL_NIF_TERM nif_is_loaded(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_info(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_command(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_gethostname(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_getnameinfo(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_getaddrinfo(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_if_name2index(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_if_index2name(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM nif_if_names(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM ncommand(ErlNifEnv* env,
ERL_NIF_TERM cmd);
static ERL_NIF_TERM ngethostname(ErlNifEnv* env);
static ERL_NIF_TERM ngetnameinfo(ErlNifEnv* env,
const SocketAddress* saP,
SOCKLEN_T saLen,
int flags);
static ERL_NIF_TERM ngetaddrinfo(ErlNifEnv* env,
char* host,
char* serv);
static ERL_NIF_TERM nif_name2index(ErlNifEnv* env,
char* ifn);
static ERL_NIF_TERM nif_index2name(ErlNifEnv* env,
unsigned int id);
static ERL_NIF_TERM nif_names(ErlNifEnv* env);
static unsigned int nif_names_length(struct if_nameindex* p);
/*
static void net_dtor(ErlNifEnv* env, void* obj);
static void net_stop(ErlNifEnv* env,
void* obj,
int fd,
int is_direct_call);
static void net_down(ErlNifEnv* env,
void* obj,
const ErlNifPid* pid,
const ErlNifMonitor* mon);
*/
static BOOLEAN_T decode_nameinfo_flags(ErlNifEnv* env,
const ERL_NIF_TERM eflags,
int* flags);
static BOOLEAN_T decode_nameinfo_flags_list(ErlNifEnv* env,
const ERL_NIF_TERM eflags,
int* flags);
static
BOOLEAN_T decode_addrinfo_string(ErlNifEnv* env,
const ERL_NIF_TERM eString,
char** stringP);
static ERL_NIF_TERM decode_bool(ErlNifEnv* env,
ERL_NIF_TERM eBool,
BOOLEAN_T* bool);
static ERL_NIF_TERM encode_address_infos(ErlNifEnv* env,
struct addrinfo* addrInfo);
static ERL_NIF_TERM encode_address_info(ErlNifEnv* env,
struct addrinfo* addrInfoP);
static unsigned int address_info_length(struct addrinfo* addrInfoP);
static ERL_NIF_TERM encode_address_info_family(ErlNifEnv* env,
int family);
static ERL_NIF_TERM encode_address_info_type(ErlNifEnv* env,
int socktype);
static ERL_NIF_TERM encode_address_info_proto(ErlNifEnv* env,
int proto);
static char* make_address_info(ErlNifEnv* env,
ERL_NIF_TERM fam,
ERL_NIF_TERM sockType,
ERL_NIF_TERM proto,
ERL_NIF_TERM addr,
ERL_NIF_TERM* ai);
static int on_load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info);
#if HAVE_IN6
# if ! defined(HAVE_IN6ADDR_ANY) || ! HAVE_IN6ADDR_ANY
# if HAVE_DECL_IN6ADDR_ANY_INIT
static const struct in6_addr in6addr_any = { { IN6ADDR_ANY_INIT } };
# else
static const struct in6_addr in6addr_any =
{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
# endif /* HAVE_IN6ADDR_ANY_INIT */
# endif /* ! HAVE_DECL_IN6ADDR_ANY */
# if ! defined(HAVE_IN6ADDR_LOOPBACK) || ! HAVE_IN6ADDR_LOOPBACK
# if HAVE_DECL_IN6ADDR_LOOPBACK_INIT
static const struct in6_addr in6addr_loopback =
{ { IN6ADDR_LOOPBACK_INIT } };
# else
static const struct in6_addr in6addr_loopback =
{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } };
# endif /* HAVE_IN6ADDR_LOOPBACk_INIT */
# endif /* ! HAVE_DECL_IN6ADDR_LOOPBACK */
#endif /* HAVE_IN6 */
/* *** String constants *** */
static char str_address_info[] = "address_info";
static char str_debug[] = "debug";
static char str_idn[] = "idn";
static char str_idna_allow_unassigned[] = "idna_allow_unassigned";
static char str_idna_use_std3_ascii_rules[] = "idna_use_std3_ascii_rules";
static char str_namereqd[] = "namereqd";
static char str_name_info[] = "name_info";
static char str_nofqdn[] = "nofqdn";
static char str_numerichost[] = "numerichost";
static char str_numericserv[] = "numericserv";
/* (special) error string constants */
static char str_eaddrfamily[] = "eaddrfamily";
static char str_ebadflags[] = "ebadflags";
static char str_efail[] = "efail";
static char str_efamily[] = "efamily";
static char str_efault[] = "efault";
static char str_emem[] = "emem";
static char str_enametoolong[] = "enametoolong";
static char str_enodata[] = "enodata";
static char str_enoname[] = "enoname";
static char str_enxio[] = "enxio";
static char str_eoverflow[] = "eoverflow";
static char str_eservice[] = "eservice";
static char str_esocktype[] = "esocktype";
static char str_esystem[] = "esystem";
/* *** Atoms *** */
static ERL_NIF_TERM atom_address_info;
static ERL_NIF_TERM atom_debug;
static ERL_NIF_TERM atom_idn;
static ERL_NIF_TERM atom_idna_allow_unassigned;
static ERL_NIF_TERM atom_idna_use_std3_ascii_rules;
static ERL_NIF_TERM atom_namereqd;
static ERL_NIF_TERM atom_name_info;
static ERL_NIF_TERM atom_nofqdn;
static ERL_NIF_TERM atom_numerichost;
static ERL_NIF_TERM atom_numericserv;
static ERL_NIF_TERM atom_eaddrfamily;
// static ERL_NIF_TERM atom_eagain;
static ERL_NIF_TERM atom_ebadflags;
static ERL_NIF_TERM atom_efail;
static ERL_NIF_TERM atom_efamily;
static ERL_NIF_TERM atom_efault;
static ERL_NIF_TERM atom_emem;
static ERL_NIF_TERM atom_enametoolong;
static ERL_NIF_TERM atom_enodata;
static ERL_NIF_TERM atom_enoname;
static ERL_NIF_TERM atom_enxio;
static ERL_NIF_TERM atom_eoverflow;
static ERL_NIF_TERM atom_eservice;
static ERL_NIF_TERM atom_esocktype;
static ERL_NIF_TERM atom_esystem;
/* *** net *** */
static ErlNifResourceType* net;
/* Maybe all of these whould be NULL? */
static ErlNifResourceTypeInit netInit = {
NULL, // net_dtor,
NULL, // net_stop,
NULL // (ErlNifResourceDown*) net_down
};
/* ----------------------------------------------------------------------
* N I F F u n c t i o n s
* ----------------------------------------------------------------------
*
* Utility and admin functions:
* ----------------------------
* nif_is_loaded/0
* nif_info/0
*
* The "proper" net functions:
* ------------------------------
* nif_gethostname/0
* nif_getnameinfo/2
* nif_getaddrinfo/3
* nif_if_name2index/1
* nif_if_index2name/1
* nif_if_names/0
*
*/
/* ----------------------------------------------------------------------
* nif_is_loaded
*
* Description:
* This functions only purpose is to return the atom 'true'.
* This will happen *if* the (socket) nif library is loaded.
* If its not, the erlang (nif_is_loaded) will instead return
* 'false'.
*/
static
ERL_NIF_TERM nif_is_loaded(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
if (argc != 0)
return enif_make_badarg(env);
return esock_atom_true;
}
/* ----------------------------------------------------------------------
* nif_info
*
* Description:
* This is currently just a placeholder...
*/
static
ERL_NIF_TERM nif_info(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM info, tmp;
NDBG( ("NET", "info -> entry\r\n") );
tmp = enif_make_new_map(env);
if (!enif_make_map_put(env, tmp, atom_debug, BOOL2ATOM(data.debug), &info))
info = tmp;
NDBG( ("NET", "info -> done: %T\r\n", info) );
return info;
}
/* ----------------------------------------------------------------------
* nif_command
*
* Description:
* This is a general purpose utility function.
*
* Arguments:
* Command - This is a general purpose command, of any type.
* Currently, the only supported command is:
*
* {debug, boolean()}
*/
static
ERL_NIF_TERM nif_command(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM ecmd, result;
NDBG( ("NET", "command -> entry (%d)\r\n", argc) );
if (argc != 1)
return enif_make_badarg(env);
ecmd = argv[0];
NDBG( ("NET", "command -> ecmd: %T\r\n", ecmd) );
result = ncommand(env, ecmd);
NDBG( ("NET", "command -> result: %T\r\n", result) );
return result;
}
/*
* The command can, in principle, be anything, though currently we only
* support a debug command.
*/
static
ERL_NIF_TERM ncommand(ErlNifEnv* env,
ERL_NIF_TERM cmd)
{
const ERL_NIF_TERM* t;
int tsz;
if (IS_TUPLE(env, cmd)) {
/* Could be the debug tuple */
if (!GET_TUPLE(env, cmd, &tsz, &t))
return esock_make_error(env, esock_atom_einval);
if (tsz != 2)
return esock_make_error(env, esock_atom_einval);
/* First element should be the atom 'debug' */
if (COMPARE(t[0], atom_debug) != 0)
return esock_make_error(env, esock_atom_einval);
return decode_bool(env, t[1], &data.debug);
} else {
return esock_make_error(env, esock_atom_einval);
}
}
/* ----------------------------------------------------------------------
* nif_gethostname
*
* Description:
* Access the hostname of the current processor.
*
*/
static
ERL_NIF_TERM nif_gethostname(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM result;
NDBG( ("NET", "nif_gethostname -> entry (%d)\r\n", argc) );
if (argc != 0)
return enif_make_badarg(env);
result = ngethostname(env);
NDBG( ("NET", "nif_gethostname -> done when result: %T\r\n", result) );
return result;
}
static
ERL_NIF_TERM ngethostname(ErlNifEnv* env)
{
ERL_NIF_TERM result;
char buf[NET_MAXHOSTNAMELEN + 1];
int res;
res = net_gethostname(buf, sizeof(buf));
NDBG( ("NET", "ngethostname -> gethostname res: %d\r\n", res) );
switch (res) {
case 0:
result = esock_make_ok2(env, MKS(env, buf));
break;
case EFAULT:
result = esock_make_error(env, atom_efault);
break;
case EINVAL:
result = esock_make_error(env, esock_atom_einval);
break;
case ENAMETOOLONG:
result = esock_make_error(env, atom_enametoolong);
break;
default:
result = esock_make_error(env, MKI(env, res));
break;
}
return result;
}
/* ----------------------------------------------------------------------
* nif_getnameinfo
*
* Description:
* Address-to-name translation in protocol-independent manner.
*
* Arguments:
* SockAddr - Socket Address (address and port)
* Flags - The flags argument modifies the behavior of getnameinfo().
*/
static
ERL_NIF_TERM nif_getnameinfo(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM result;
ERL_NIF_TERM eSockAddr, eFlags;
int flags = 0; // Just in case...
SocketAddress sa;
SOCKLEN_T saLen = 0; // Just in case...
NDBG( ("NET", "nif_getnameinfo -> entry (%d)\r\n", argc) );
if (argc != 2)
return enif_make_badarg(env);
eSockAddr = argv[0];
eFlags = argv[1];
NDBG( ("NET",
"nif_getnameinfo -> "
"\r\n SockAddr: %T"
"\r\n Flags: %T"
"\r\n", eSockAddr, eFlags) );
if (!esock_decode_sockaddr(env, eSockAddr, &sa, &saLen))
return enif_make_badarg(env);
if (!decode_nameinfo_flags(env, eFlags, &flags))
return enif_make_badarg(env);
result = ngetnameinfo(env, &sa, saLen, flags);
NDBG( ("NET",
"nif_getnameinfo -> done when result: "
"\r\n %T\r\n", result) );
return result;
}
/* Given the provided sock(et) address (and honts), retreive the host and
* service info.
*/
static
ERL_NIF_TERM ngetnameinfo(ErlNifEnv* env,
const SocketAddress* saP,
SOCKLEN_T saLen,
int flags)
{
ERL_NIF_TERM result;
char host[HOSTNAME_LEN];
SOCKLEN_T hostLen = sizeof(host);
char serv[SERVICE_LEN];
SOCKLEN_T servLen = sizeof(serv);
int res = getnameinfo((struct sockaddr*) saP, saLen,
host, hostLen,
serv, servLen,
flags);
NDBG( ("NET", "ngetnameinfo -> res: %d\r\n", res) );
switch (res) {
case 0:
{
ERL_NIF_TERM info = MKT3(env,
atom_name_info,
MKS(env, host),
MKS(env, serv));
result = esock_make_ok2(env, info);
}
break;
case EAI_AGAIN:
result = esock_make_error(env, esock_atom_eagain);
break;
case EAI_BADFLAGS:
result = esock_make_error(env, atom_ebadflags);
break;
case EAI_FAIL:
result = esock_make_error(env, atom_efail);
break;
case EAI_FAMILY:
result = esock_make_error(env, atom_efamily);
break;
case EAI_MEMORY:
result = esock_make_error(env, atom_emem);
break;
case EAI_NONAME:
result = esock_make_error(env, atom_enoname);
break;
case EAI_OVERFLOW:
result = esock_make_error(env, atom_eoverflow);
break;
case EAI_SYSTEM:
result = esock_make_error_errno(env, get_errno());
break;
default:
result = esock_make_error(env, esock_atom_einval);
break;
}
return result;
}
/* ----------------------------------------------------------------------
* nif_getaddrinfo
*
* Description:
* Network address and service translation.
*
* Arguments:
* Host - Host name (either a string or the atom undefined)
* Service - Service name (either a string or the atom undefined)
* Hints - Hints for the lookup (address info record) (currently *ignored*)
*/
static
ERL_NIF_TERM nif_getaddrinfo(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM result, eHostName, eServName; //, eHints;
char* hostName;
char* servName;
// struct addrinfo* hints;
NDBG( ("NET", "nif_getaddrinfo -> entry (%d)\r\n", argc) );
if (argc != 3) {
return enif_make_badarg(env);
}
eHostName = argv[0];
eServName = argv[1];
// eHints = argv[2];
NDBG( ("NET",
"nif_getaddrinfo -> "
"\r\n ehost: %T"
"\r\n eservice: %T"
"\r\n ehints: %T"
"\r\n", argv[0], argv[1], argv[2]) );
if (!decode_addrinfo_string(env, eHostName, &hostName))
return enif_make_badarg(env);
if (!decode_addrinfo_string(env, eServName, &servName))
return enif_make_badarg(env);
/*
if (decode_addrinfo_hints(env, eHints, &hints))
return enif_make_badarg(env);
*/
if ((hostName == NULL) && (servName == NULL))
return enif_make_badarg(env);
result = ngetaddrinfo(env, hostName, servName);
if (hostName != NULL)
FREE(hostName);
if (servName != NULL)
FREE(servName);
/*
if (hints != NULL)
FREE(hints);
*/
NDBG( ("NET",
"nif_getaddrinfo -> done when result: "
"\r\n %T\r\n", result) );
return result;
}
static
ERL_NIF_TERM ngetaddrinfo(ErlNifEnv* env,
char* host,
char* serv)
{
ERL_NIF_TERM result;
struct addrinfo* addrInfoP;
int res;
NDBG( ("NET", "ngetaddrinfo -> entry with"
"\r\n host: %s"
"\r\n serv: %s"
"\r\n",
((host == NULL) ? "NULL" : host),
((serv == NULL) ? "NULL" : serv)) );
res = getaddrinfo(host, serv, NULL, &addrInfoP);
NDBG( ("NET", "ngetaddrinfo -> res: %d\r\n", res) );
switch (res) {
case 0:
{
ERL_NIF_TERM addrInfo = encode_address_infos(env, addrInfoP);
freeaddrinfo(addrInfoP);
result = esock_make_ok2(env, addrInfo);
}
break;
case EAI_ADDRFAMILY:
result = esock_make_error(env, atom_eaddrfamily);
break;
case EAI_AGAIN:
result = esock_make_error(env, esock_atom_eagain);
break;
case EAI_BADFLAGS:
result = esock_make_error(env, atom_ebadflags);
break;
case EAI_FAIL:
result = esock_make_error(env, atom_efail);
break;
case EAI_FAMILY:
result = esock_make_error(env, atom_efamily);
break;
case EAI_MEMORY:
result = esock_make_error(env, atom_emem);
break;
case EAI_NODATA:
result = esock_make_error(env, atom_enodata);
break;
case EAI_NONAME:
result = esock_make_error(env, atom_enoname);
break;
case EAI_SERVICE:
result = esock_make_error(env, atom_eservice);
break;
case EAI_SOCKTYPE:
result = esock_make_error(env, atom_esocktype);
break;
case EAI_SYSTEM:
result = esock_make_error(env, atom_esystem);
break;
default:
result = esock_make_error(env, esock_atom_einval);
break;
}
return result;
}
/* ----------------------------------------------------------------------
* nif_if_name2index
*
* Description:
* Perform a Interface Name to Interface Index translation.
*
* Arguments:
* Ifn - Interface name to be translated.
*/
static
ERL_NIF_TERM nif_if_name2index(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM eifn, result;
char ifn[IF_NAMESIZE+1];
NDBG( ("NET", "nif_if_name2index -> entry (%d)\r\n", argc) );
if (argc != 1) {
return enif_make_badarg(env);
}
eifn = argv[0];
NDBG( ("NET",
"nif_if_name2index -> "
"\r\n Ifn: %T"
"\r\n", argv[0]) );
if (0 >= GET_STR(env, eifn, ifn, sizeof(ifn)))
return esock_make_error(env, esock_atom_einval);
result = nif_name2index(env, ifn);
NDBG( ("NET", "nif_if_name2index -> done when result: %T\r\n", result) );
return result;
}
static
ERL_NIF_TERM nif_name2index(ErlNifEnv* env,
char* ifn)
{
unsigned int idx;
NDBG( ("NET", "nif_name2index -> entry with ifn: %s\r\n", ifn) );
idx = if_nametoindex(ifn);
NDBG( ("NET", "nif_name2index -> idx: %d\r\n", idx) );
if (idx == 0)
return esock_make_error_errno(env, get_errno());
else
return esock_make_ok2(env, MKI(env, idx));
}
/* ----------------------------------------------------------------------
* nif_if_index2name
*
* Description:
* Perform a Interface Index to Interface Name translation.
*
* Arguments:
* Idx - Interface index to be translated.
*/
static
ERL_NIF_TERM nif_if_index2name(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM result;
unsigned int idx;
NDBG( ("NET", "nif_if_index2name -> entry (%d)\r\n", argc) );
if ((argc != 1) ||
!GET_UINT(env, argv[0], &idx)) {
return enif_make_badarg(env);
}
NDBG( ("NET", "nif_index2name -> "
"\r\n Idx: %T"
"\r\n", argv[0]) );
result = nif_index2name(env, idx);
NDBG( ("NET", "nif_if_index2name -> done when result: %T\r\n", result) );
return result;
}
static
ERL_NIF_TERM nif_index2name(ErlNifEnv* env,
unsigned int idx)
{
ERL_NIF_TERM result;
char* ifn = MALLOC(IF_NAMESIZE+1);
if (ifn == NULL)
return enif_make_badarg(env); // PLACEHOLDER
if (NULL != if_indextoname(idx, ifn)) {
result = esock_make_ok2(env, MKS(env, ifn));
} else {
result = esock_make_error(env, atom_enxio);
}
FREE(ifn);
return result;
}
/* ----------------------------------------------------------------------
* nif_if_names
*
* Description:
* Get network interface names and indexes.
*
*/
static
ERL_NIF_TERM nif_if_names(ErlNifEnv* env,
int argc,
const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM result;
NDBG( ("NET", "nif_if_names -> entry (%d)\r\n", argc) );
if (argc != 0) {
return enif_make_badarg(env);
}
result = nif_names(env);
NDBG( ("NET", "nif_if_names -> done when result: %T\r\n", result) );
return result;
}
static
ERL_NIF_TERM nif_names(ErlNifEnv* env)
{
ERL_NIF_TERM result;
struct if_nameindex* ifs = if_nameindex();
NDBG( ("NET", "nif_names -> ifs: 0x%lX\r\n", ifs) );
if (ifs == NULL) {
result = esock_make_error_errno(env, get_errno());
} else {
/*
* We got some interfaces:
* 1) Calculate how many - the only way is to iterate through the list
* until its end (which is indicated by an entry with index = zero
* and if_name = NULL).
* 2) Allocate an ERL_NIF_TERM array of the calculated length.
* 3) Iterate through the array of interfaces and for each create
* a two tuple: {Idx, If}
*
* Or shall we instead build a list in reverse order and then when
* its done, reverse that? Check
*/
unsigned int len = nif_names_length(ifs);
NDBG( ("NET", "nif_names -> len: %d\r\n", len) );
if (len > 0) {
ERL_NIF_TERM* array = MALLOC(len * sizeof(ERL_NIF_TERM));
unsigned int i;
for (i = 0; i < len; i++) {
array[i] = MKT2(env,
MKI(env, ifs[i].if_index),
MKS(env, ifs[i].if_name));
}
result = esock_make_ok2(env, MKLA(env, array, len));
FREE(array);
} else {
result = esock_make_ok2(env, enif_make_list(env, 0));
}
}
if (ifs != NULL)
if_freenameindex(ifs);
return result;
}
static
unsigned int nif_names_length(struct if_nameindex* p)
{
unsigned int len = 0;
BOOLEAN_T done = FALSE;
while (!done) {
NDBG( ("NET", "nif_names_length -> %d: "
"\r\n if_index: %d"
"\r\n if_name: 0x%lX"
"\r\n", len, p[len].if_index, p[len].if_name) );
if ((p[len].if_index == 0) && (p[len].if_name == NULL))
done = TRUE;
else
len++;
}
return len;
}
/* ----------------------------------------------------------------------
* U t i l i t y F u n c t i o n s
* ----------------------------------------------------------------------
*/
/* The erlang format for a set of flags is a list of atoms.
* A special case is when there is no flags, which is
* represented by the atom undefined.
*/
static
BOOLEAN_T decode_nameinfo_flags(ErlNifEnv* env,
const ERL_NIF_TERM eflags,
int* flags)
{
BOOLEAN_T result;
if (IS_ATOM(env, eflags)) {
if (COMPARE(eflags, esock_atom_undefined) == 0) {
*flags = 0;
result = TRUE;
} else {
result = FALSE;
}
} else if (IS_LIST(env, eflags)) {
NDBG( ("NET", "decode_nameinfo_flags -> is atom\r\n") );
result = decode_nameinfo_flags_list(env, eflags, flags);
} else {
result = FALSE;
}
return result;
}
static
BOOLEAN_T decode_nameinfo_flags_list(ErlNifEnv* env,
const ERL_NIF_TERM eflags,
int* flags)
{
ERL_NIF_TERM elem, tail, list = eflags;
int tmp = 0;
BOOLEAN_T done = FALSE;
while (!done) {
if (GET_LIST_ELEM(env, list, &elem, &tail)) {
if (COMPARE(elem, atom_namereqd) == 0) {
tmp |= NI_NAMEREQD;
} else if (COMPARE(elem, esock_atom_dgram) == 0) {
tmp |= NI_DGRAM;
} else if (COMPARE(elem, atom_nofqdn) == 0) {
tmp |= NI_NOFQDN;
} else if (COMPARE(elem, atom_numerichost) == 0) {
tmp |= NI_NUMERICHOST;
} else if (COMPARE(elem, atom_numericserv) == 0) {
tmp |= NI_NUMERICSERV;
/* Starting with glibc 2.3.4: */
#if defined(NI_IDN)
} else if (COMPARE(elem, atom_idn) == 0) {
tmp |= NI_IDN;
#endif
#if defined(NI_IDN_ALLOW_UNASSIGNED)
} else if (COMPARE(elem, atom_idna_allow_unassigned) == 0) {
tmp |= NI_IDN_ALLOW_UNASSIGNED;
#endif
#if defined(NI_IDN_USE_STD3_ASCII_RULES)
} else if (COMPARE(elem, atom_idna_use_std3_ascii_rules) == 0) {
tmp |= NI_IDN_USE_STD3_ASCII_RULES;
#endif
} else {
return FALSE;
}
list = tail;
} else {
done = TRUE;
}
}
*flags = tmp;
return TRUE;
}
/* Decode the address info string (hostname or service name)
* The string is either the atom undefined or an actual string.
*/
static
BOOLEAN_T decode_addrinfo_string(ErlNifEnv* env,
const ERL_NIF_TERM eString,
char** stringP)
{
BOOLEAN_T result;
if (IS_ATOM(env, eString)) {
if (COMPARE(eString, esock_atom_undefined) == 0) {
*stringP = NULL;
result = TRUE;
} else {
*stringP = NULL;
result = FALSE;
}
} else {
result = esock_decode_string(env, eString, stringP);
}
return result;
}
static
ERL_NIF_TERM decode_bool(ErlNifEnv* env,
ERL_NIF_TERM eBool,
BOOLEAN_T* bool)
{
if (COMPARE(eBool, esock_atom_true) == 0) {
*bool = TRUE;
return esock_atom_ok;
} else if (COMPARE(eBool, esock_atom_false) == 0) {
*bool = FALSE;
return esock_atom_ok;
} else {
return esock_make_error(env, esock_atom_einval);
}
}
/* Encode the address info
* The address info is a linked list och address info, which
* will result in the result being a list of zero or more length.
*/
static
ERL_NIF_TERM encode_address_infos(ErlNifEnv* env,
struct addrinfo* addrInfo)
{
ERL_NIF_TERM result;
unsigned int len = address_info_length(addrInfo);
NDBG( ("NET", "encode_address_infos -> len: %d\r\n", len) );
if (len > 0) {
ERL_NIF_TERM* array = MALLOC(len * sizeof(ERL_NIF_TERM)); // LEAK?
unsigned int i = 0;
struct addrinfo* p = addrInfo;
while (i < len) {
array[i] = encode_address_info(env, p);
p = p->ai_next;
i++;
}
result = MKLA(env, array, len);
} else {
result = MKEL(env);
}
NDBG( ("NET", "encode_address_infos -> result: "
"\r\n %T\r\n", result) );
return result;
}
/* Calculate the length of the adress info linked list
* The list is NULL-terminated, so the only way is to
* iterate through the list until we find next = NULL.
*/
static
unsigned int address_info_length(struct addrinfo* addrInfoP)
{
unsigned int len = 1;
struct addrinfo* tmp;
BOOLEAN_T done = FALSE;
tmp = addrInfoP;
while (!done) {
if (tmp->ai_next != NULL) {
len++;
tmp = tmp->ai_next;
} else {
done = TRUE;
}
}
return len;
}
/* Create one (erlang) instance of the address info record
* Should we have address info as a record or as a map?
*
* {address_info, Fam, Type, Proto, Addr}
*/
static
ERL_NIF_TERM encode_address_info(ErlNifEnv* env,
struct addrinfo* addrInfoP)
{
ERL_NIF_TERM fam, type, proto, addr, addrInfo;
fam = encode_address_info_family(env, addrInfoP->ai_family);
type = encode_address_info_type(env, addrInfoP->ai_socktype);
proto = encode_address_info_proto(env, addrInfoP->ai_protocol);
esock_encode_sockaddr(env,
(SocketAddress*) addrInfoP->ai_addr,
addrInfoP->ai_addrlen,
&addr);
if (make_address_info(env, fam, type, proto, addr, &addrInfo) == NULL)
return addrInfo;
else
return esock_atom_undefined; // We should to better...
}
/* Convert an "native" family to an erlang family (=domain).
* Note that this is not currently exhaustive, but only supports
* inet and inet6. Other values will be returned as is, that is
* in the form of an integer.
*/
static
ERL_NIF_TERM encode_address_info_family(ErlNifEnv* env,
int family)
{
ERL_NIF_TERM efam;
if (NULL != esock_encode_domain(env, family, &efam))
efam = MKI(env, family);
return efam;
}
/* Convert an "native" socket type to an erlang socket type.
* Note that this is not currently exhaustive, but only supports
* stream and dgram. Other values will be returned as is, that is
* in the form of an integer.
*/
static
ERL_NIF_TERM encode_address_info_type(ErlNifEnv* env,
int socktype)
{
ERL_NIF_TERM etype;
if (NULL != esock_encode_type(env, socktype, &etype))
etype = MKI(env, socktype);
return etype;
}
/* Convert an "native" protocol to an erlang protocol.
* Note that this is not currently exhaustive, but only supports
* tcp and udp. Other values will be returned as is, that is
* in the form of an integer.
*/
static
ERL_NIF_TERM encode_address_info_proto(ErlNifEnv* env,
int proto)
{
ERL_NIF_TERM eproto;
if (NULL != esock_encode_protocol(env, proto, &eproto))
eproto = MKI(env, proto);
return eproto;
}
static
char* make_address_info(ErlNifEnv* env,
ERL_NIF_TERM fam,
ERL_NIF_TERM sockType,
ERL_NIF_TERM proto,
ERL_NIF_TERM addr,
ERL_NIF_TERM* ai)
{
ERL_NIF_TERM keys[] = {esock_atom_family,
esock_atom_type,
esock_atom_protocol,
esock_atom_addr};
ERL_NIF_TERM vals[] = {fam, sockType, proto, addr};
unsigned int numKeys = sizeof(keys) / sizeof(ERL_NIF_TERM);
unsigned int numVals = sizeof(vals) / sizeof(ERL_NIF_TERM);
ESOCK_ASSERT( (numKeys == numVals) );
if (!MKMA(env, keys, vals, numKeys, ai)) {
*ai = esock_atom_undefined;
return ESOCK_STR_EINVAL;
} else {
return NULL;
}
}
/* ----------------------------------------------------------------------
* C a l l b a c k F u n c t i o n s
* ----------------------------------------------------------------------
*/
/* =========================================================================
* net_dtor - Callback function for resource destructor
*
*/
/*
static
void net_dtor(ErlNifEnv* env, void* obj)
{
}
*/
/* =========================================================================
* net_stop - Callback function for resource stop
*
*/
/*
static
void net_stop(ErlNifEnv* env, void* obj, int fd, int is_direct_call)
{
}
*/
/* =========================================================================
* net_down - Callback function for resource down (monitored processes)
*
*/
/*
static
void net_down(ErlNifEnv* env,
void* obj,
const ErlNifPid* pid,
const ErlNifMonitor* mon)
{
}
*/
/* ----------------------------------------------------------------------
* L o a d / u n l o a d / u p g r a d e F u n c t i o n s
* ----------------------------------------------------------------------
*/
static
ErlNifFunc net_funcs[] =
{
// Some utility functions
{"nif_is_loaded", 0, nif_is_loaded, 0},
{"nif_info", 0, nif_info, 0},
{"nif_command", 1, nif_command, 0}, // Shall we let this be dirty?
/* get/set hostname */
{"nif_gethostname", 0, nif_gethostname, 0},
/* address and name translation in protocol-independent manner */
{"nif_getnameinfo", 2, nif_getnameinfo, 0},
{"nif_getaddrinfo", 3, nif_getaddrinfo, 0},
/* Network interface (name and/or index) functions */
{"nif_if_name2index", 1, nif_if_name2index, 0},
{"nif_if_index2name", 1, nif_if_index2name, 0},
{"nif_if_names", 0, nif_if_names, 0}
};
/* =======================================================================
* load_info - A map of misc info (e.g global debug)
*/
static
int on_load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
// We should make it possible to use load_info to get default values
data.debug = TRUE;
NDBG( ("NET", "on_load -> entry\r\n") );
/* +++ Misc atoms +++ */
atom_address_info = MKA(env, str_address_info);
atom_debug = MKA(env, str_debug);
atom_idn = MKA(env, str_idn);
atom_idna_allow_unassigned = MKA(env, str_idna_allow_unassigned);
atom_idna_use_std3_ascii_rules = MKA(env, str_idna_use_std3_ascii_rules);
atom_namereqd = MKA(env, str_namereqd);
atom_name_info = MKA(env, str_name_info);
atom_nofqdn = MKA(env, str_nofqdn);
atom_numerichost = MKA(env, str_numerichost);
atom_numericserv = MKA(env, str_numericserv);
/* Error codes */
atom_eaddrfamily = MKA(env, str_eaddrfamily);
atom_ebadflags = MKA(env, str_ebadflags);
atom_efail = MKA(env, str_efail);
atom_efamily = MKA(env, str_efamily);
atom_efault = MKA(env, str_efault);
atom_emem = MKA(env, str_emem);
atom_enametoolong = MKA(env, str_enametoolong);
atom_enodata = MKA(env, str_enodata);
atom_enoname = MKA(env, str_enoname);
atom_enxio = MKA(env, str_enxio);
atom_eoverflow = MKA(env, str_eoverflow);
atom_eservice = MKA(env, str_eservice);
atom_esocktype = MKA(env, str_esocktype);
atom_esystem = MKA(env, str_esystem);
// For storing "global" things...
// data.env = enif_alloc_env(); // We should really check
// data.version = MKA(env, ERTS_VERSION);
// data.buildDate = MKA(env, ERTS_BUILD_DATE);
net = enif_open_resource_type_x(env,
"net",
&netInit,
ERL_NIF_RT_CREATE,
NULL);
NDBG( ("NET", "on_load -> done\r\n") );
return !net;
}
ERL_NIF_INIT(net, net_funcs, on_load, NULL, NULL, NULL)
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