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Commit 781bcc96 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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- Include proper source IP address in SAP header (longstanding FIXME) 

  (btw, fixes SAP to link-local multicast IPv6)
- Fix scoped IPv6 address in SDP
- Cleanup multicast address determination and others
parent e18ee6e3
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Showing with 85 additions and 89 deletions
src/stream_output/sap.c
View file @ 781bcc96
......@@ -254,90 +254,112 @@ static void RunThread( vlc_object_t *p_this)
static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
session_descriptor_t *p_session )
{
int i;
const char *psz_type = "application/sdp";
int i_header_size;
char *psz_head;
int i_header_size, i;
char *psz_head, psz_addr[NI_MAXNUMERICHOST];
vlc_bool_t b_ipv6 = VLC_FALSE;
sap_session_t *p_sap_session;
mtime_t i_hash;
char psz_buf[NI_MAXNUMERICHOST], *ptr;
const char *psz_addr;
struct addrinfo hints, *res;
struct sockaddr_storage addr;
vlc_mutex_lock( &p_sap->object_lock );
if( p_session->psz_uri == NULL )
{
vlc_mutex_unlock( &p_sap->object_lock );
msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
msg_Err( p_sap, "This should not happen. VLC needs fixing." );
vlc_mutex_unlock( &p_sap->object_lock );
return VLC_EGENERIC;
}
/* Determine SAP multicast address automatically (FIXME: gruik) */
/* Canonicalize IP address (e.g. 224.00.010.1 => 224.0.10.1) */
/* Determine SAP multicast address automatically */
memset( &hints, 0, sizeof( hints ) );
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_NUMERICHOST;
i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, 0,
&hints, &res );
if( i == 0 )
if( i )
{
i = vlc_getnameinfo( res->ai_addr, res->ai_addrlen, psz_buf,
sizeof( psz_buf ), NULL, NI_NUMERICHOST );
vlc_freeaddrinfo( res );
vlc_mutex_unlock( &p_sap->object_lock );
msg_Err( p_sap, "Invalid URI for SAP announce: %s: %s",
p_session->psz_uri, vlc_gai_strerror( i ) );
return VLC_EGENERIC;
}
if( i )
if( (unsigned)res->ai_addrlen > sizeof( addr ) )
{
msg_Err( p_sap, "Invalid URI for SAP announce : %s : %s",
p_session->psz_uri, vlc_gai_strerror( i ) );
vlc_mutex_unlock( &p_sap->object_lock );
vlc_freeaddrinfo( res );
msg_Err( p_sap, "Unsupported address family of size %d > %u",
res->ai_addrlen, sizeof( addr ) );
return VLC_EGENERIC;
}
/* Remove interface specification if present */
ptr = strchr( psz_buf, '%' );
if( ptr != NULL )
*ptr = '\0';
memcpy( &addr, res->ai_addr, res->ai_addrlen );
if( strchr( psz_buf, ':' ) != NULL )
switch( addr.ss_family )
{
b_ipv6 = VLC_TRUE;
#if defined (HAVE_GETADDRINFO) || defined (WIN32)
case AF_INET6:
{
/* See RFC3513 for list of valid IPv6 scopes */
struct in6_addr *a6 = &((struct sockaddr_in6 *)&addr)->sin6_addr;
memcpy( a6->s6_addr + 2, "\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x02\x7f\xfe", 14 );
if( IN6_IS_ADDR_MULTICAST( a6 ) )
/* force flags to zero, preserve scope */
a6->s6_addr[1] &= 0xf;
else
/* Unicast IPv6 - assume global scope */
memcpy( a6->s6_addr, "\xff\x0e", 2 );
b_ipv6 = VLC_TRUE;
break;
}
#endif
/* See RFC3513 for list of valid IPv6 scopes */
if( ( tolower( psz_buf[0] ) == 'f' )
&& ( tolower( psz_buf[1] ) == 'f' )
&& isxdigit( psz_buf[2] ) && isxdigit( psz_buf[3] ) )
case AF_INET:
{
/* Multicast IPv6 */
psz_buf[2] = '0'; /* force flags to zero */
/* keep scope in psz_addr[3] */
memcpy( &psz_buf[4], "::2:7ffe", sizeof( "::2:7ffe" ) );
psz_addr = psz_buf;
/* See RFC2365 for IPv4 scopes */
uint32_t ipv4;
ipv4 = ntohl( ((struct sockaddr_in *)&addr)->sin_addr.s_addr );
/* 224.0.0.0/24 => 224.0.0.255 */
if ((ipv4 & 0xffffff00) == 0xe0000000)
ipv4 = 0xe00000ff;
else
/* 239.255.0.0/16 => 239.255.255.255 */
if ((ipv4 & 0xffff0000) == 0xefff0000)
ipv4 = 0xefffffff;
else
/* 239.192.0.0/14 => 239.195.255.255 */
if ((ipv4 & 0xfffc0000) == 0xefc00000)
ipv4 = 0xefc3ffff;
else
/* other addresses => 224.2.127.254 */
ipv4 = 0xe0027ffe;
break;
}
else
/* Unicast IPv6 - assume global scope */
psz_addr = "ff0e::2:7ffe";
default:
vlc_mutex_unlock( &p_sap->object_lock );
vlc_freeaddrinfo( res );
msg_Err( p_sap, "Address family %d not supported by SAP",
addr.ss_family );
return VLC_EGENERIC;
}
else
i = vlc_getnameinfo( (struct sockaddr *)&addr, res->ai_addrlen,
psz_addr, sizeof( psz_addr ), NULL, NI_NUMERICHOST );
vlc_freeaddrinfo( res );
if( i )
{
/* See RFC2365 for IPv4 scopes */
if( memcmp( psz_buf, "224.0.0.", 8 ) == 0 )
psz_addr = "224.0.0.255";
else
if( memcmp( psz_buf, "239.255.", 8 ) == 0 )
psz_addr = "239.255.255.255";
else
if( ( memcmp( psz_buf, "239.19", 6 ) == 0 )
&& ( ( psz_buf[6] >= '2' ) && ( psz_buf[6] <= '5' ) ) )
psz_addr = "239.195.255.255";
else
/* assume global scope */
psz_addr = "224.2.127.254";
vlc_mutex_unlock( &p_sap->object_lock );
msg_Err( p_sap, "%s", vlc_gai_strerror( i ) );
return VLC_EGENERIC;
}
msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
......@@ -371,9 +393,16 @@ static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
p_address->i_port );
if( p_address->i_wfd != -1 )
{
char *ptr;
net_StopRecv( p_address->i_wfd );
net_GetSockAddress( p_sap, p_address->i_wfd,
p_address->psz_machine, NULL );
/* removes scope if present */
ptr = strchr( p_address->psz_machine, '%' );
if( ptr != NULL )
*ptr = '\0';
}
if( p_sap->b_control == VLC_TRUE )
......@@ -412,7 +441,7 @@ static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
/* Build the SAP Headers */
i_header_size = ( b_ipv6 ? 20 : 8 ) + strlen( psz_type ) + 1;
i_header_size = ( b_ipv6 ? 16 : 4 ) + 20;
psz_head = (char *) malloc( i_header_size * sizeof( char ) );
if( psz_head == NULL )
{
......@@ -420,51 +449,18 @@ static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
return VLC_ENOMEM;
}
psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
/* SAPv1, not encrypted, not compressed */
psz_head[0] = b_ipv6 ? 0x30 : 0x20;
psz_head[1] = 0x00; /* No authentification length */
i_hash = mdate();
psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
psz_head[3] = (i_hash & 0xFF); /* Msg id hash 2 */
if( b_ipv6 )
{
/* in_addr_t ip_server = inet_addr( ip ); */
psz_head[0] |= 0x10; /* Set IPv6 */
psz_head[4] = 0x01; /* Source IP FIXME: we should get the real address */
psz_head[5] = 0x02; /* idem */
psz_head[6] = 0x03; /* idem */
psz_head[7] = 0x04; /* idem */
psz_head[8] = 0x01; /* Source IP FIXME: we should get the real address */
psz_head[9] = 0x02; /* idem */
psz_head[10] = 0x03; /* idem */
psz_head[11] = 0x04; /* idem */
psz_head[12] = 0x01; /* Source IP FIXME: we should get the real address */
psz_head[13] = 0x02; /* idem */
psz_head[14] = 0x03; /* idem */
psz_head[15] = 0x04; /* idem */
psz_head[16] = 0x01; /* Source IP FIXME: we should get the real address */
psz_head[17] = 0x02; /* idem */
psz_head[18] = 0x03; /* idem */
psz_head[19] = 0x04; /* idem */
strncpy( psz_head + 20, psz_type, 15 );
}
else
{
/* in_addr_t ip_server = inet_addr( ip) */
/* Source IP FIXME: we should get the real address */
psz_head[4] = 0x01; /* ip_server */
psz_head[5] = 0x02; /* ip_server>>8 */
psz_head[6] = 0x03; /* ip_server>>16 */
psz_head[7] = 0x04; /* ip_server>>24 */
strncpy( psz_head + 8, psz_type, 15 );
}
inet_pton( b_ipv6 ? AF_INET6 : AF_INET, /* can't fail */
p_sap_session->p_address->psz_machine, psz_head + 4 );
memcpy( psz_head + (b_ipv6 ? 20 : 8), "application/sdp", 15 );
/* If needed, build the SDP */
if( p_session->psz_sdp == NULL )
......
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