Commit b376f505 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

vlc_getaddrinfo, vlc_getnameinfo and vlc_gai_strerror replacements

parent 81c348d6
......@@ -395,6 +395,7 @@ SOURCES_libvlc_common = \
src/misc/variables.c \
src/misc/error.c \
src/misc/net.c \
src/misc/getaddrinfo.c \
src/misc/vlm.c \
src/misc/xml.c \
src/extras/libc.c \
......
/*****************************************************************************
* getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
*****************************************************************************
* Copyright (C) 2005 VideoLAN
* Copyright (C) 2002-2004 Rémi Denis-Courmont
* $Id$
*
* Author: Rémi Denis-Courmont <rem # videolan.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#include <vlc/vlc.h>
#include "network.h"
#include <stddef.h> /* size_t */
#include <string.h> /* strncpy(), strlen(), memcpy(), memset(), strchr() */
#include <stdlib.h> /* malloc(), free(), strtoul() */
#include <sys/types.h>
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <errno.h>
#if defined (UNDER_CE)
# include <winsock.h>
#elif defined WIN32
# include <winsock2.h>
# include <ws2tcpip.h>
#else
# include <netdb.h>
#endif
#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\
NI_DGRAM)
# define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
#ifndef HAVE_GAI_STRERROR
static struct
{
int code;
const char *msg;
} const __gai_errlist[] =
{
{ 0, "Error 0" },
{ EAI_BADFLAGS, "Invalid flag used" },
{ EAI_NONAME, "Host or service not found" },
{ EAI_AGAIN, "Temporary name service failure" },
{ EAI_FAIL, "Non-recoverable name service failure" },
{ EAI_NODATA, "No data for host name" },
{ EAI_FAMILY, "Unsupported address family" },
{ EAI_SOCKTYPE, "Unsupported socket type" },
{ EAI_SERVICE, "Incompatible service for socket type" },
{ EAI_ADDRFAMILY, "Unavailable address family for host name" },
{ EAI_MEMORY, "Memory allocation failure" },
{ EAI_SYSTEM, "System error" },
{ 0, NULL }
};
static const char *__gai_unknownerr = "Unrecognized error number";
/****************************************************************************
* Converts an EAI_* error code into human readable english text.
****************************************************************************/
const char *vlc_gai_strerror( int errnum )
{
int i;
for (i = 0; __gai_errlist[i].msg != NULL; i++)
if (errnum == __gai_errlist[i].code)
return __gai_errlist[i].msg;
return __gai_unknownerr;
}
# undef _EAI_POSITIVE_MAX
#else /* ifndef HAVE_GAI_STRERROR */
const char *vlc_gai_strerror( int errnum )
{
return gai_strerror( errnum );
}
#endif
#if !(defined (HAVE_GETNAMEINFO) && defined (HAVE_GETADDRINFO))
/*
* Converts the current herrno error value into an EAI_* error code.
* That error code is normally returned by getnameinfo() or getaddrinfo().
*/
static int
gai_error_from_herrno( void )
{
switch(h_errno)
{
case HOST_NOT_FOUND:
return EAI_NONAME;
case NO_ADDRESS:
# if (NO_ADDRESS != NO_DATA)
case NO_DATA:
# endif
return EAI_NODATA;
case NO_RECOVERY:
return EAI_FAIL;
case TRY_AGAIN:
return EAI_AGAIN;
}
return EAI_SYSTEM;
}
#endif /* if !(HAVE_GETNAMEINFO && HAVE_GETADDRINFO) */
#ifndef HAVE_GETNAMEINFO
/*
* getnameinfo() non-thread-safe IPv4-only implementation,
* Address-family-independant address to hostname translation
* (reverse DNS lookup in case of IPv4).
*
* This is meant for use on old IP-enabled systems that are not IPv6-aware,
* and probably do not have getnameinfo(), but have the old gethostbyaddr()
* function.
*
* GNU C library 2.0.x is known to lack this function, even though it defines
* getaddrinfo().
*/
static int
__getnameinfo( const struct sockaddr *sa, socklen_t salen,
char *host, int hostlen, char *serv, int servlen, int flags )
{
if (((unsigned)salen < sizeof (struct sockaddr_in))
|| (sa->sa_family != AF_INET))
return EAI_FAMILY;
else if (flags & (~_NI_MASK))
return EAI_BADFLAGS;
else
{
const struct sockaddr_in *addr;
addr = (const struct sockaddr_in *)sa;
if (host != NULL)
{
int solved = 0;
/* host name resolution */
if (!(flags & NI_NUMERICHOST))
{
struct hostent *hent;
hent = gethostbyaddr ((const void*)&addr->sin_addr,
4, AF_INET);
if (hent != NULL)
{
strncpy (host, hent->h_name, hostlen);
host[hostlen - 1] = '\0';
/*
* only keep first part of hostname
* if user don't want fully qualified
* domain name
*/
if (flags & NI_NOFQDN)
{
char *ptr;
ptr = strchr (host, '.');
if (ptr != NULL)
*ptr = 0;
}
solved = 1;
}
else if (flags & NI_NAMEREQD)
return gai_error_from_herrno ();
}
if (!solved)
{
/* inet_ntoa() can't fail */
strncpy (host, inet_ntoa (addr->sin_addr), hostlen);
host[hostlen - 1] = '\0';
}
}
if (serv != NULL)
{
struct servent *sent = NULL;
int solved = 0;
/* service name resolution */
if (!(flags & NI_NUMERICSERV))
{
sent = getservbyport(addr->sin_port,
(flags & NI_DGRAM)
? "udp" : "tcp");
if (sent != NULL)
{
strncpy (serv, sent->s_name, servlen);
serv[servlen - 1] = 0;
solved = 1;
}
}
if (sent == NULL)
{
snprintf (serv, servlen, "%u",
(unsigned int)ntohs (addr->sin_port));
serv[servlen - 1] = '\0';
}
}
}
return 0;
}
#endif /* if !HAVE_GETNAMEINFO */
#ifndef HAVE_GETADDRINFO
/*
* This functions must be used to free the memory allocated by getaddrinfo().
*/
static void
__freeaddrinfo (struct addrinfo *res)
{
if (res != NULL)
{
if (res->ai_canonname != NULL)
free (res->ai_canonname);
if (res->ai_addr != NULL)
free (res->ai_addr);
if (res->ai_next != NULL)
free (res->ai_next);
free (res);
}
}
/*
* Internal function that builds an addrinfo struct.
*/
static struct addrinfo *
makeaddrinfo (int af, int type, int proto,
const struct sockaddr *addr, size_t addrlen,
const char *canonname)
{
struct addrinfo *res;
res = (struct addrinfo *)malloc (sizeof (struct addrinfo));
if (res != NULL)
{
res->ai_flags = 0;
res->ai_family = af;
res->ai_socktype = type;
res->ai_protocol = proto;
res->ai_addrlen = addrlen;
res->ai_addr = malloc (addrlen);
res->ai_canonname = NULL;
res->ai_next = NULL;
if (res->ai_addr != NULL)
{
memcpy (res->ai_addr, addr, addrlen);
if (canonname != NULL)
{
res->ai_canonname = strdup (canonname);
if (res->ai_canonname != NULL)
return res; /* success ! */
}
else
return res;
}
}
/* failsafe */
freeaddrinfo (res);
return NULL;
}
static struct addrinfo *
makeipv4info (int type, int proto, u_long ip, u_short port, const char *name)
{
struct sockaddr_in addr;
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
# ifdef HAVE_SA_LEN
addr.sin_len = sizeof (addr);
# endif
addr.sin_port = port;
addr.sin_addr.s_addr = ip;
return makeaddrinfo (PF_INET, type, proto,
(struct sockaddr*)&addr, sizeof (addr), name);
}
/*
* getaddrinfo() non-thread-safe IPv4-only implementation
* Address-family-independant hostname to address resolution.
*
* This is meant for IPv6-unaware systems that do probably not provide
* getaddrinfo(), but still have old function gethostbyname().
*
* Only UDP and TCP over IPv4 are supported here.
*/
static int
__getaddrinfo (const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res)
{
struct addrinfo *info;
u_long ip;
u_short port;
int protocol = 0, flags = 0;
const char *name = NULL;
if (hints != NULL)
{
flags = hints->ai_flags;
if (flags & ~_AI_MASK)
return EAI_BADFLAGS;
/* only accept AF_INET and AF_UNSPEC */
if (hints->ai_family && (hints->ai_family != AF_INET))
return EAI_FAMILY;
/* protocol sanity check */
switch (hints->ai_socktype)
{
case SOCK_STREAM:
protocol = IPPROTO_TCP;
break;
case SOCK_DGRAM:
protocol = IPPROTO_UDP;
break;
case SOCK_RAW:
case 0:
break;
default:
return EAI_SOCKTYPE;
}
if (hints->ai_protocol && protocol
&& (protocol != hints->ai_protocol))
return EAI_SERVICE;
}
*res = NULL;
/* default values */
if (node == NULL)
{
if (flags & AI_PASSIVE)
ip = htonl (INADDR_ANY);
else
ip = htonl (INADDR_LOOPBACK);
}
else
if ((ip = inet_addr (node)) == INADDR_NONE)
{
struct hostent *entry = NULL;
/* hostname resolution */
if (!(flags & AI_NUMERICHOST))
entry = gethostbyname (node);
if (entry == NULL)
return EAI_NONAME;
if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET))
return EAI_FAMILY;
ip = *((u_long *) entry->h_addr);
if (flags & AI_CANONNAME)
name = entry->h_name;
}
if ((flags & AI_CANONNAME) && (name == NULL))
name = node;
/* service resolution */
if (service == NULL)
port = 0;
else
{
long d;
char *end;
d = strtoul (service, &end, 0);
if (end[0] /* service is not a number */
|| (d > 65535))
{
struct servent *entry;
const char *protoname;
switch (protocol)
{
case IPPROTO_TCP:
protoname = "tcp";
break;
case IPPROTO_UDP:
protoname = "udp";
break;
default:
protoname = NULL;
}
entry = getservbyname (service, protoname);
if (entry == NULL)
return EAI_SERVICE;
port = entry->s_port;
}
else
port = htons ((u_short)d);
}
/* building results... */
if ((!protocol) || (protocol == IPPROTO_UDP))
{
info = makeipv4info (SOCK_DGRAM, IPPROTO_UDP, ip, port, name);
if (info == NULL)
{
errno = ENOMEM;
return EAI_SYSTEM;
}
if (flags & AI_PASSIVE)
info->ai_flags |= AI_PASSIVE;
*res = info;
}
if ((!protocol) || (protocol == IPPROTO_TCP))
{
info = makeipv4info (SOCK_STREAM, IPPROTO_TCP, ip, port, name);
if (info == NULL)
{
errno = ENOMEM;
return EAI_SYSTEM;
}
info->ai_next = *res;
if (flags & AI_PASSIVE)
info->ai_flags |= AI_PASSIVE;
*res = info;
}
return 0;
}
#endif /* if !HAVE_GETADDRINFO */
int vlc_getnameinfo( vlc_object_t *p_this, const struct sockaddr *sa, int salen,
char *host, int hostlen, char *serv, int servlen, int flags )
{
#ifdef WIN32
/*
* Here is the kind of kludge you need to keep binary compatibility among
* varying OS versions...
*/
typedef int (CALLBACK * GETNAMEINFO) ( const struct sockaddr*, socklen_t,
char*, DWORD, char*, DWORD, int );
HINSTANCE wship6_module;
GETNAMEINFO ws2_getnameinfo;
wship6_module = LoadLibrary( "wship6.dll" );
if( wship6_module != NULL )
{
ws2_getnameinfo = (GETNAMEINFO)GetProcAddress( wship6_module,
"getnameinfo" );
if( ws2_getnameinfo != NULL )
{
int i_val;
i_val = ws2_getnameinfo( sa, salen, host, hostlen, serv, servlen,
flags );
FreeLibrary( wship6_module );
return i_val;
}
FreeLibrary( wship6_module );
}
#endif
#if HAVE_GETNAMEINFO
return getnameinfo( sa, salen, host, hostlen, serv, servlen, flags );
#else
{
vlc_value_t lock;
int i_val;
/* my getnameinfo implementation is not thread-safe as it uses
* gethostbyaddr and the likes */
var_Create( p_this->p_libvlc, "getnameinfo_mutex", VLC_VAR_MUTEX );
var_Get( p_this->p_libvlc, "getnameinfo_mutex", &lock );
vlc_mutex_lock( lock.p_address );
i_val = __getnameinfo( sa, salen, host, hostlen, serv, servlen, flags );
vlc_mutex_unlock( lock.p_address );
return i_val;
}
#endif
}
/* TODO: support for setting sin6_scope_id */
int vlc_getaddrinfo( vlc_object_t *p_this, const char *node,
const char *service, const struct addrinfo *p_hints,
struct addrinfo **res )
{
struct addrinfo hints;
char psz_buf[NI_MAXHOST], *psz_node;
/* Check if we have to force ipv4 or ipv6 */
if( p_hints == NULL )
memset( &hints, 0, sizeof( hints ) );
else
memcpy( &hints, p_hints, sizeof( hints ) );
if( hints.ai_family == AF_UNSPEC )
{
vlc_value_t val;
var_Create( p_this, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
var_Get( p_this, "ipv4", &val );
if( val.b_bool )
hints.ai_family = AF_INET;
var_Create( p_this, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
var_Get( p_this, "ipv6", &val );
if( val.b_bool )
hints.ai_family = AF_INET6;
}
/*
* VLC extensions :
* - accept "" as NULL
* - ignore square brackets
*/
if( ( node == NULL ) || (node[0] == '\0' ) )
psz_node = NULL;
else
{
strncpy( psz_buf, node, NI_MAXHOST );
psz_buf[NI_MAXHOST - 1] = '\0';
psz_node = psz_buf;
if( psz_buf[0] == '[' )
{
char *ptr;
ptr = strrchr( psz_buf, ']' );
if( ( ptr != NULL ) && (ptr[1] == '\0' ) )
{
*ptr = '\0';
psz_node++;
}
}
}
if( ( service != NULL ) && ( *service == '\0' ) )
/* We could put NULL, but you can't have both node and service NULL */
service = "0";
#ifdef WIN32
typedef int (CALLBACK * GETADDRINFO) ( const char *, const char *,
const struct addrinfo *,
struct addrinfo ** );
HINSTANCE wship6_module;
GETADDRINFO ws2_getaddrinfo;
wship6_module = LoadLibrary( "wship6.dll" );
if( wship6_module != NULL )
{
ws2_getaddrinfo = (GETADDRINFO)GetProcAddress( wship6_module,
"getaddrinfo" );
if( ws2_getaddrinfo != NULL )
{
int i_ret;
i_ret = ws2_getaddrinfo( psz_node, service, &hints, res );
FreeLibrary( wship6_module ); /* is this wise ? */
return i_ret;
}
FreeLibrary( wship6_module );
}
#endif
#if HAVE_GETADDRINFO
return getaddrinfo( psz_node, service, &hints, res );
#else
{
int i_ret;
vlc_value_t lock;
var_Create( p_this->p_libvlc, "getaddrinfo_mutex", VLC_VAR_MUTEX );
var_Get( p_this->p_libvlc, "getaddrinfo_mutex", &lock );
vlc_mutex_lock( lock.p_address );
i_ret = __getaddrinfo( psz_node, service, &hints, res );
vlc_mutex_unlock( lock.p_address );
return i_ret;
}
#endif
}
void vlc_freeaddrinfo( struct addrinfo *infos )
{
#ifdef WIN32
typedef void (CALLBACK * FREEADDRINFO) ( struct addrinfo * );
HINSTANCE wship6_module;
FREEADDRINFO ws2_freeaddrinfo;
wship6_module = LoadLibrary( "wship6.dll" );
if( wship6_module != NULL )
{
ws2_freeaddrinfo = (FREEADDRINFO)GetProcAddress( wship6_module,
"freeaddrinfo" );
/*
* NOTE: it is assumed that wship6.dll defines either both
* getaddrinfo and freeaddrinfo or none of them.
*/
if( ws2_freeaddrinfo != NULL )
{
ws2_freeaddrinfo( infos );
FreeLibrary( wship6_module );
return;