* getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
*****************************************************************************
* Copyright (C) 2005 the VideoLAN team
- * Copyright (C) 2002-2004 Rémi Denis-Courmont
+ * Copyright (C) 2002-2007 Rémi Denis-Courmont
* $Id$
*
* Author: Rémi Denis-Courmont <rem # videolan.org>
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <vlc/vlc.h>
#include <stddef.h> /* size_t */
-#include <string.h> /* strncpy(), strlen(), memcpy(), memset(), strchr() */
+#include <string.h> /* strlen(), memcpy(), memset(), strchr() */
#include <stdlib.h> /* malloc(), free(), strtoul() */
#include <errno.h>
# include <unistd.h>
#endif
-#include "network.h"
+#include <vlc_network.h>
#ifndef NO_ADDRESS
# define NO_ADDRESS NO_DATA
# define AF_UNSPEC 0
#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
{ EAI_SERVICE, "Incompatible service for socket type" },
{ EAI_ADDRFAMILY, "Unavailable address family for host name" },
{ EAI_MEMORY, "Memory allocation failure" },
+ { EAI_OVERFLOW, "Buffer overflow" },
{ EAI_SYSTEM, "System error" },
{ 0, NULL }
};
/****************************************************************************
* Converts an EAI_* error code into human readable english text.
****************************************************************************/
-const char *vlc_gai_strerror( int errnum )
+const char *vlc_gai_strerror (int errnum)
{
- int i;
-
- for (i = 0; __gai_errlist[i].msg != NULL; i++)
+ for (unsigned 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 )
+const char *vlc_gai_strerror (int errnum)
{
- return gai_strerror( 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
+#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\
+ NI_DGRAM)
/*
* getnameinfo() non-thread-safe IPv4-only implementation,
* Address-family-independant address to hostname translation
* GNU C library 2.0.x is known to lack this function, even though it defines
* getaddrinfo().
*/
+#ifdef WIN32
+static int WSAAPI
+getnameinfo (const struct sockaddr *sa, socklen_t salen,
+ char *host, DWORD hostlen, char *serv, DWORD servlen, int flags)
+#else
static int
-__getnameinfo( const struct sockaddr *sa, socklen_t salen,
- char *host, int hostlen, char *serv, int servlen, int flags )
+getnameinfo (const struct sockaddr *sa, socklen_t salen,
+ char *host, int hostlen, char *serv, int servlen, int flags)
+#endif
{
- if (((unsigned)salen < sizeof (struct sockaddr_in))
+ if (((size_t)salen < sizeof (struct sockaddr_in))
|| (sa->sa_family != AF_INET))
return EAI_FAMILY;
else if (flags & (~_NI_MASK))
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 (flags & NI_NAMEREQD)
+ return EAI_NONAME;
}
- if (!solved)
- {
- /* inet_ntoa() can't fail */
- strncpy (host, inet_ntoa (addr->sin_addr), hostlen);
- host[hostlen - 1] = '\0';
- }
+ /* inet_ntoa() is not thread-safe, do not use it */
+ uint32_t ipv4 = ntohl (addr->sin_addr.s_addr);
+
+ if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24,
+ (ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff,
+ ipv4 & 0xff) >= (int)hostlen)
+ return EAI_OVERFLOW;
}
if (serv != NULL)
{
- struct servent *sent = NULL;
-
-#ifndef SYS_BEOS /* No getservbyport() */
- 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;
- }
- }
-#else
- sent = NULL;
-#endif
- if (sent == NULL)
- {
- snprintf (serv, servlen, "%u",
- (unsigned int)ntohs (addr->sin_port));
- serv[servlen - 1] = '\0';
- }
+ if (snprintf (serv, servlen, "%u",
+ (unsigned int)ntohs (addr->sin_port)) >= (int)servlen)
+ return EAI_OVERFLOW;
}
}
return 0;
#endif /* if !HAVE_GETNAMEINFO */
-
#ifndef HAVE_GETADDRINFO
+#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
+/*
+ * 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;
+}
+
/*
* This functions must be used to free the memory allocated by getaddrinfo().
*/
-static void
-__freeaddrinfo (struct addrinfo *res)
+#ifdef WIN32
+static void WSAAPI freeaddrinfo (struct addrinfo *res)
+#else
+static void freeaddrinfo (struct addrinfo *res)
+#endif
{
if (res != NULL)
{
*
* Only UDP and TCP over IPv4 are supported here.
*/
+#ifdef WIN32
+static int WSAAPI
+getaddrinfo (const char *node, const char *service,
+ const struct addrinfo *hints, struct addrinfo **res)
+#else
static int
-__getaddrinfo (const char *node, const char *service,
- const struct addrinfo *hints, struct addrinfo **res)
+getaddrinfo (const char *node, const char *service,
+ const struct addrinfo *hints, struct addrinfo **res)
+#endif
{
struct addrinfo *info;
u_long ip;
int protocol = 0, flags = 0;
const char *name = NULL;
+#ifdef WIN32
+ /*
+ * Maybe you knew already that Winsock does not handle TCP/RST packets
+ * properly, so that when a TCP connection fails, it will wait until it
+ * times out even if the remote host did return a TCP/RST. However, it
+ * still sees the TCP/RST as the error code is 10061 instead of 10060.
+ * Basically, we have the stupid brainfucked behavior with DNS queries...
+ * When the recursive DNS server returns an error, Winsock waits about
+ * 2 seconds before it returns to the callers, even though it should know
+ * that is pointless. I'd like to know how come this hasn't been fixed
+ * for the past decade, or maybe not.
+ *
+ * Anyway, this is causing a severe delay when the SAP listener tries
+ * to resolve more than ten IPv6 numeric addresses. Modern systems will
+ * eventually realize that it is an IPv6 address, and won't try to resolve
+ * it as a IPv4 address via the Domain Name Service. Old systems
+ * (including Windows XP without the IPv6 stack) will not. It is normally
+ * not an issue as the DNS server usually returns an error very quickly.
+ * But it IS a severe issue on Windows, given the bug explained above.
+ * So here comes one more bug-to-bug Windows compatibility fix.
+ */
+ if ((node != NULL) && (strchr (node, ':') != NULL))
+ return EAI_NONAME;
+#endif
+
if (hints != NULL)
{
flags = hints->ai_flags;
protocol = IPPROTO_UDP;
break;
-#ifndef SYS_BEOS
+#ifndef SOCK_RAW
case SOCK_RAW:
#endif
case 0:
entry = gethostbyname (node);
if (entry == NULL)
- return EAI_NONAME;
+ return gai_error_from_herrno ();
if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET))
return EAI_FAMILY;
port = 0;
else
{
- long d;
+ unsigned 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;
+ if (end[0] || (d > 65535u))
+ return EAI_SERVICE;
- port = entry->s_port;
- }
- else
- port = htons ((u_short)d);
+ port = htons ((u_short)d);
}
/* building results... */
}
#endif /* if !HAVE_GETADDRINFO */
-
-int vlc_getnameinfo( const struct sockaddr *sa, int salen,
- char *host, int hostlen, int *portnum, int flags )
-{
- char psz_servbuf[6], *psz_serv;
- int i_servlen, i_val;
#if defined( WIN32 ) && !defined( UNDER_CE )
/*
* 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;
+typedef int (WSAAPI * GETNAMEINFO) ( const struct sockaddr FAR *, socklen_t,
+ char FAR *, DWORD, char FAR *, DWORD, int );
+typedef int (WSAAPI * GETADDRINFO) (const char FAR *, const char FAR *,
+ const struct addrinfo FAR *,
+ struct addrinfo FAR * FAR *);
+
+typedef void (WSAAPI * FREEADDRINFO) ( struct addrinfo FAR * );
+
+static int WSAAPI _ws2_getnameinfo_bind ( const struct sockaddr FAR *, socklen_t,
+ char FAR *, DWORD, char FAR *, DWORD, int );
+static int WSAAPI _ws2_getaddrinfo_bind (const char FAR *, const char FAR *,
+ const struct addrinfo FAR *,
+ struct addrinfo FAR * FAR *);
+
+static GETNAMEINFO ws2_getnameinfo = _ws2_getnameinfo_bind;
+static GETADDRINFO ws2_getaddrinfo = _ws2_getaddrinfo_bind;
+static FREEADDRINFO ws2_freeaddrinfo;
+
+static FARPROC ws2_find_api (LPCTSTR name)
+{
+ FARPROC f = NULL;
+
+ HMODULE m = GetModuleHandle (TEXT("WS2_32"));
+ if (m != NULL)
+ f = GetProcAddress (m, name);
+
+ if (f == NULL)
+ {
+ /* Windows 2K IPv6 preview */
+ m = LoadLibrary (TEXT("WSHIP6"));
+ if (m != NULL)
+ f = GetProcAddress (m, name);
+ }
+
+ return f;
+}
+
+static WSAAPI int _ws2_getnameinfo_bind( const struct sockaddr FAR * sa, socklen_t salen,
+ char FAR *host, DWORD hostlen, char FAR *serv, DWORD servlen, int flags )
+{
+ GETNAMEINFO entry = (GETNAMEINFO)ws2_find_api (TEXT("getnameinfo"));
+ int result;
+
+ if (entry == NULL)
+ {
+ /* not found, use replacement API instead */
+ entry = getnameinfo;
+
+ }
+ /* call API before replacing function pointer to avoid crash */
+ result = entry (sa, salen, host, hostlen, serv, servlen, flags);
+ ws2_getnameinfo = entry;
+ return result;
+}
+#undef getnameinfo
+#define getnameinfo ws2_getnameinfo
+
+static WSAAPI int _ws2_getaddrinfo_bind(const char FAR *node, const char FAR *service,
+ const struct addrinfo FAR *hints, struct addrinfo FAR * FAR *res)
+{
+ GETADDRINFO entry;
+ FREEADDRINFO freentry;
+ int result;
+
+ entry = (GETADDRINFO)ws2_find_api (TEXT("getaddrinfo"));
+ freentry = (FREEADDRINFO)ws2_find_api (TEXT("freeaddrinfo"));
+
+ if ((entry == NULL) || (freentry == NULL))
+ {
+ /* not found, use replacement API instead */
+ entry = getaddrinfo;
+ freentry = freeaddrinfo;
+ }
+ /* call API before replacing function pointer to avoid crash */
+ result = entry (node, service, hints, res);
+ ws2_freeaddrinfo = freentry;
+ ws2_getaddrinfo = entry;
+ return result;
+}
+#undef getaddrinfo
+#undef freeaddrinfo
+#define getaddrinfo ws2_getaddrinfo
+#define freeaddrinfo ws2_freeaddrinfo
+#define HAVE_GETADDRINFO
#endif
+
+
+int vlc_getnameinfo( const struct sockaddr *sa, int salen,
+ char *host, int hostlen, int *portnum, int flags )
+{
+ char psz_servbuf[6], *psz_serv;
+ int i_servlen, i_val;
+
flags |= NI_NUMERICSERV;
if( portnum != NULL )
{
psz_serv = NULL;
i_servlen = 0;
}
-#if defined( WIN32 ) && !defined( UNDER_CE )
- wship6_module = LoadLibrary( "wship6.dll" );
- if( wship6_module != NULL )
- {
- ws2_getnameinfo = (GETNAMEINFO)GetProcAddress( wship6_module,
- "getnameinfo" );
- if( ws2_getnameinfo != NULL )
- {
- i_val = ws2_getnameinfo( sa, salen, host, hostlen, psz_serv,
- i_servlen, flags );
- FreeLibrary( wship6_module );
-
- if( portnum != NULL )
- *portnum = atoi( psz_serv );
- return i_val;
- }
-
- FreeLibrary( wship6_module );
- }
-#endif
-#if defined( HAVE_GETNAMEINFO ) || defined( UNDER_CE )
i_val = getnameinfo(sa, salen, host, hostlen, psz_serv, i_servlen, flags);
-#else
- {
-# ifdef HAVE_USABLE_MUTEX_THAT_DONT_NEED_LIBVLC_POINTER
- static vlc_value_t lock;
-
- /* my getnameinfo implementation is not thread-safe as it uses
- * gethostbyaddr and the likes */
- vlc_mutex_lock( lock.p_address );
-#else
-//# warning FIXME : This is not thread-safe!
-#endif
- i_val = __getnameinfo( sa, salen, host, hostlen, psz_serv, i_servlen,
- flags );
-# ifdef HAVE_USABLE_MUTEX_THAT_DONT_NEED_LIBVLC_POINTER
- vlc_mutex_unlock( lock.p_address );
-# endif
- }
-#endif
if( portnum != NULL )
*portnum = atoi( psz_serv );
}
-/* TODO: support for setting sin6_scope_id */
int vlc_getaddrinfo( vlc_object_t *p_this, const char *node,
int i_port, const struct addrinfo *p_hints,
struct addrinfo **res )
snprintf( psz_service, 6, "%d", i_port );
/* 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 ) );
+ memset (&hints, 0, sizeof (hints));
+ if (p_hints != NULL)
+ {
+ const int safe_flags =
+ AI_PASSIVE |
+ AI_CANONNAME |
+ AI_NUMERICHOST |
+#ifdef AI_NUMERICSERV
+ AI_NUMERICSERV |
+#endif
+#ifdef AI_ALL
+ AI_ALL |
+#endif
+#ifdef AI_ADDRCONFIG
+ AI_ADDRCONFIG |
+#endif
+#ifdef AI_V4MAPPED
+ AI_V4MAPPED |
+#endif
+ 0;
+
+ hints.ai_family = p_hints->ai_family;
+ hints.ai_socktype = p_hints->ai_socktype;
+ hints.ai_protocol = p_hints->ai_protocol;
+ /* Unfortunately, some flags chang the layout of struct addrinfo, so
+ * they cannot be copied blindly from p_hints to &hints. Therefore, we
+ * only copy flags that we know for sure are "safe".
+ */
+ hints.ai_flags = p_hints->ai_flags & safe_flags;
+ }
+
+#ifdef AI_NUMERICSERV
+ /* We only ever use port *numbers* */
+ hints.ai_flags |= AI_NUMERICSERV;
+#endif
if( hints.ai_family == AF_UNSPEC )
{
#endif
}
- /*
+ /*
* VLC extensions :
* - accept "" as NULL
* - ignore square brackets
}
else
{
- strncpy( psz_buf, node, NI_MAXHOST );
- psz_buf[NI_MAXHOST - 1] = '\0';
+ strlcpy( psz_buf, node, NI_MAXHOST );
psz_node = psz_buf;
}
}
-#if defined( WIN32 ) && !defined( UNDER_CE )
+#ifdef WIN32
+ /*
+ * Winsock tries to resolve numerical IPv4 addresses as AAAA
+ * and IPv6 addresses as A... There comes the bug-to-bug fix.
+ */
+ if ((hints.ai_flags & AI_NUMERICHOST) == 0)
{
- 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;
+ hints.ai_flags |= AI_NUMERICHOST;
- i_ret = ws2_getaddrinfo( psz_node, psz_service, &hints, res );
- FreeLibrary( wship6_module ); /* is this wise ? */
- return i_ret;
- }
+ if (getaddrinfo (psz_node, psz_service, &hints, res) == 0)
+ return 0;
- FreeLibrary( wship6_module );
- }
+ hints.ai_flags &= ~AI_NUMERICHOST;
}
#endif
-#if defined( HAVE_GETADDRINFO ) || defined( UNDER_CE )
+#if defined (HAVE_GETADDRINFO)
# ifdef AI_IDN
/* Run-time I18n Domain Names support */
- {
- static vlc_bool_t i_idn = VLC_TRUE; /* beware of thread-safety */
-
- if( i_idn )
- {
- int i_ret;
+ static vlc_bool_t b_idn = VLC_TRUE; /* beware of thread-safety */
- hints.ai_flags |= AI_IDN;
- i_ret = getaddrinfo( psz_node, psz_service, &hints, res );
-
- if( i_ret != EAI_BADFLAGS )
- return i_ret;
+ if (b_idn)
+ {
+ hints.ai_flags |= AI_IDN;
+ int ret = getaddrinfo (psz_node, psz_service, &hints, res);
- /* libidn not available: disable and retry without it */
+ if (ret != EAI_BADFLAGS)
+ return ret;
- /* NOTE: Using i_idn here would not be thread-safe */
- hints.ai_flags &= ~AI_IDN;
- i_idn = VLC_FALSE;
- msg_Dbg( p_this, "I18n Domain Names not supported - disabled" );
- }
+ /* IDN not available: disable and retry without it */
+ hints.ai_flags &= ~AI_IDN;
+ b_idn = VLC_FALSE;
+ msg_Info (p_this, "International Domain Names not supported");
}
# endif
- return getaddrinfo( psz_node, psz_service, &hints, res );
+ return getaddrinfo (psz_node, psz_service, &hints, res);
#else
-{
- int i_ret;
-
+ int 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 );
+ 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, psz_service, &hints, res );
- vlc_mutex_unlock( lock.p_address );
- return i_ret;
-}
+ ret = getaddrinfo (psz_node, psz_service, &hints, res);
+ vlc_mutex_unlock (lock.p_address);
+ return ret;
#endif
}
void vlc_freeaddrinfo( struct addrinfo *infos )
{
-#if defined( WIN32 ) && !defined( UNDER_CE )
- 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;
- }
-
- FreeLibrary( wship6_module );
- }
-#endif
-#if defined( HAVE_GETADDRINFO ) || defined( UNDER_CE )
- freeaddrinfo( infos );
-#else
- __freeaddrinfo( infos );
-#endif
+ freeaddrinfo (infos);
}
projects / vlc / blobdiff