[vlc-devel] [PATCH] Addressed items in original AMT code submission and added FQDN support
Wayne Brassem
wbrassem at rogers.com
Fri Jan 18 20:49:47 CET 2019
Great comments. Thank you. I’ll get on it. And next time I’ll try to squash all three files atm.c, amt.h and Makefile.am into a single patch since they need to be applied together.
Wayne.
> On Jan 18, 2019, at 12:34 PM, Tristan Matthews <tmatth at videolan.org> wrote:
>
> Hi,
>
> On Thu, Jan 17, 2019 at 6:41 AM Wayne Brassem <wbrassem at rogers.com <mailto:wbrassem at rogers.com>> wrote:
>>
>> Addressing items raised in https://mailman.videolan.org/pipermail/vlc-devel/2018-November/121776.html and added FQDN support to the AMT code.
>> AMT stands for Automatic Multicast Tunnelling and allow the user to receive multicast streams over an non-multicast enabled network by tunnelling through an AMT relay.
>>
>> From 91ef0bbc4b43eceaa3aea6cb2710232370a67ec8 Mon Sep 17 00:00:00 2001
>> From: Wayne Brassem <wbrassem at rogers.com>
>> Date: Mon, 14 Jan 2019 18:25:02 -0500
>> Subject: [PATCH 1/3] Addressed items in original AMT code submission and added
>> FQDN support
>>
>> ---
>> modules/access/Makefile.am | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/modules/access/Makefile.am b/modules/access/Makefile.am
>> index c56cb8fe3a..792c6efb04 100644
>> --- a/modules/access/Makefile.am
>> +++ b/modules/access/Makefile.am
>> @@ -373,6 +373,10 @@ libudp_plugin_la_SOURCES = access/udp.c
>> libudp_plugin_la_LIBADD = $(SOCKET_LIBS)
>> access_LTLIBRARIES += libudp_plugin.la
>>
>> +libamt_plugin_la_SOURCES = access/amt.c access/amt.h
>> +libamt_plugin_la_LIBADD = $(SOCKET_LIBS)
>> +access_LTLIBRARIES += libamt_plugin.la
>> +
>> libunc_plugin_la_SOURCES = access/unc.c access/smb_common.h
>> libunc_plugin_la_LIBADD = -lmpr -lnetapi32
>> if HAVE_WIN32
>> --
>> 2.17.2 (Apple Git-113)
>>
>> From 91c757f47445095ac8de8574a8b216cca3043898 Mon Sep 17 00:00:00 2001
>> From: Wayne Brassem <wbrassem at rogers.com>
>> Date: Mon, 14 Jan 2019 18:47:06 -0500
>> Subject: [PATCH 2/3] Addressed concerns in first submissions and added support
>> for FQDN
>>
>> ---
>> modules/access/amt.c | 1208 ++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 1208 insertions(+)
>> create mode 100644 modules/access/amt.c
>>
>> diff --git a/modules/access/amt.c b/modules/access/amt.c
>> new file mode 100644
>> index 0000000000..df023be9dc
>> --- /dev/null
>> +++ b/modules/access/amt.c
>> @@ -0,0 +1,1208 @@
>> +/**
>> + * @file amt.c
>> + * @brief Automatic Multicast Tunneling Protocol (AMT) file for VLC media player
>> + * Allows multicast streaming when not in a multicast-enabled network
>> + * Currently IPv4 is supported, but IPv6 is not yet.
>> + *
>> + * Copyright (C) 2018 VLC authors and VideoLAN
>> + * Copyright (c) Juniper Networks, Inc., 2018. All rights reserved.
>> + *
>> + * Authors: Christophe Massiot <massiot at via.ecp.fr> - original UDP code
>> + * Tristan Leteurtre <tooney at via.ecp.fr> - original UDP code
>> + * Laurent Aimar <fenrir at via.ecp.fr> - original UDP code
>> + * Jean-Paul Saman <jpsaman #_at_# m2x dot nl> - original UDP code
>> + * Remi Denis-Courmont - original UDP code
>> + * Natalie Landsberg natalie.landsberg97 at gmail.com - AMT support
>> + * Wayne Brassem <wbrassem at rogers.com> - Added FQDN support
>> + *
>> + * This code is licensed to you under the GNU Lesser General Public License
>> + * version 2.1 or later. You may not use this code except in compliance with
>> + * the GNU Lesser General Public License.
>> + * This code is not an official Juniper product.
>> + *
>> + * This library is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU Lesser General Public License
>> + * as published by the Free Software Foundation; either version 2.1
>> + * of the License, or (at your option) any later version.
>> + *
>> + * This library 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 Lesser General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU Lesser General Public
>> + * License along with this library; if not, write to the Free Software
>> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
>> + ****************************************************************************/
>> +#ifdef HAVE_CONFIG_H
>> +# include "config.h"
>> +#endif
>> +
>> +#include <errno.h>
>> +#include <ctype.h>
>> +#ifdef HAVE_ARPA_INET_H
>> +# include <arpa/inet.h>
>> +#endif
>> +
>> +#ifdef HAVE_SYS_SELECT_H
>> +# include <sys/select.h>
>> +#endif
>> +
>> +#ifdef HAVE_SYS_SOCKET_H
>> +# include <sys/socket.h>
>> +#endif
>> +
>> +#include <vlc_common.h>
>> +#include <vlc_demux.h>
>> +#include <vlc_plugin.h>
>> +#include <vlc_access.h>
>> +#include <vlc_network.h>
>> +#include <vlc_block.h>
>> +#include <vlc_interrupt.h>
>> +#include <vlc_url.h>
>> +
>> +#include "amt.h"
>> +
>> +#ifdef HAVE_POLL
>> + #include <poll.h>
>> +#endif
>> +#ifdef HAVE_SYS_UIO_H
>> + #include <sys/uio.h>
>> +#endif
>> +
>> +#define BUFFER_TEXT N_("Receive buffer")
>> +#define BUFFER_LONGTEXT N_("AMT receive buffer size (bytes)" )
>> +#define TIMEOUT_TEXT N_("Native multicast timeout (sec)")
>> +#define AMT_TIMEOUT_TEXT N_("AMT timeout (sec)")
>> +#define AMT_RELAY_ADDRESS N_("AMT relay (IP address or FQDN)")
>> +#define AMT_RELAY_ADDR_LONG N_("AMT relay anycast address, or specify the relay you want by address or fully qualified domain name")
>> +#define AMT_DEFAULT_RELAY N_("amt-relay.m2icast.net")
>> +
>> +static int Open (vlc_object_t *);
>> +static void Close (vlc_object_t *);
>> +
>> +/* memory leak and packet counters */
>> +static int mem_alloc, packet;
>
> This information should be stored in the access_sys_t struct instead
> of static globals, or just deleted since it seems to be for debugging
> only.
>
>> +
>> +vlc_module_begin ()
>> + set_shortname( N_("AMT" ) )
>> + set_description( N_("AMT input") )
>> + set_category( CAT_INPUT )
>> + set_subcategory( SUBCAT_INPUT_ACCESS )
>> +
>> + add_integer( "amt-timeout", 5, AMT_TIMEOUT_TEXT, NULL, true )
>> + add_integer( "amt-native-timeout", 3, TIMEOUT_TEXT, NULL, true )
>> + add_string( "amt-relay", AMT_DEFAULT_RELAY, AMT_RELAY_ADDRESS, AMT_RELAY_ADDR_LONG, true )
>> +
>> + set_capability( "access", 0 )
>> + add_shortcut( "amt" )
>> +
>> + set_callbacks( Open, Close )
>> +vlc_module_end ()
>> +
>> +/*****************************************************************************
>> + * Control:
>> + *****************************************************************************/
>> +static int Control( stream_t *p_access, int i_query, va_list args )
>> +{
>> + bool *pb_bool;
>> +
>> +/* msg_Dbg( p_access, "Control: mem_alloc = %d", mem_alloc); */
>
> This can be deleted.
>
>> +
>> + switch( i_query )
>> + {
>> + case STREAM_CAN_SEEK:
>> + case STREAM_CAN_FASTSEEK:
>> + case STREAM_CAN_PAUSE:
>> + case STREAM_CAN_CONTROL_PACE:
>> + pb_bool = va_arg( args, bool * );
>> + *pb_bool = false;
>> + break;
>> +
>> + case STREAM_GET_PTS_DELAY:
>> + *va_arg( args, vlc_tick_t * ) =
>> + VLC_TICK_FROM_MS(var_InheritInteger( p_access, "network-caching" ));
>> + break;
>> +
>> + default:
>> + return VLC_EGENERIC;
>> + }
>> + return VLC_SUCCESS;
>> +}
>> +
>> +/*****************************************************************************
>> + * BlockUDP:
>> + *****************************************************************************/
>> +static block_t *BlockUDP(stream_t *p_access, bool *restrict eof)
>> +{
>> + access_sys_t *sys = p_access->p_sys;
>> + ssize_t len;
>> +
>> + block_t *pkt = block_Alloc(sys->mtu);
>> + char *amtpkt = malloc( DEFAULT_MTU );
>> +
>> + packet++;
>> + mem_alloc++; /* do not include *pkt in memory alloc count because it gets freed by caller */
>> +
>> +/* msg_Dbg( p_access, "BlockUDP Enter: packet = %d, mem_alloc = %d, pkt = %016x, amtpkt = %016x", packet, mem_alloc, (int) pkt, (int) amtpkt); */
>> +
>> + if (unlikely(pkt == NULL))
>> + { /* OOM - dequeue and discard one packet */
>> + char dummy;
>> + recv(sys->fd, &dummy, 1, 0);
>> + return NULL;
>> + }
>> +
>> + if (unlikely(amtpkt == NULL))
>> + goto error;
>> +
>> + struct iovec iov = {
>> + .iov_base = pkt->p_buffer,
>> + .iov_len = sys->mtu,
>> + };
>> + struct msghdr msg = {
>> + .msg_iov = &iov,
>> + .msg_iovlen = 1,
>> +#ifdef __linux__
>> + .msg_flags = MSG_TRUNC,
>> +#endif
>> + };
>> +
>> + struct pollfd ufd[1];
>> +
>> + if( sys->tryAMT )
>> + ufd[0].fd = sys->sAMT;
>> + else
>> + ufd[0].fd = sys->fd;
>> + ufd[0].events = POLLIN;
>> +
>> + switch (vlc_poll_i11e(ufd, 1, sys->timeout))
>> + {
>> + case 0:
>> + msg_Err(p_access, "native multicast receive time-out, packet = %d", packet);
>> + net_Close( sys->fd );
>> + if( !sys->tryAMT )
>> + {
>> + if( open_amt_tunnel( p_access ) == false )
>
> You can just do if (!open_amt_tunnel( p_access ))
>
>> + goto error;
>> + break;
>> + }
>> + else
>> + {
>> + msg_Err(p_access, "AMT receive time-out");
>> + *eof = true;
>> + }
>> + /* fall through */
>> + case -1:
>> +/* msg_Dbg(p_access, "Exiting vlc_poll switch, packet = %d", packet); */
>> + goto error;
>> + }
>> +
>> + if( sys->tryAMT )
>> + {
>> + len = recv( sys->sAMT, amtpkt, DEFAULT_MTU, 0 );
>> +
>> + if( len < 0 || amtpkt[0] != AMT_MULT_DATA )
>> + goto error;
>> +
>> + ssize_t shift = IP_HDR_LEN + UDP_HDR_LEN + AMT_HDR_LEN;
>> +
>> + if( len < shift )
>> + {
>> + msg_Err(p_access, "%zd bytes packet truncated (MTU was %zu)",
>> + len, sys->mtu);
>> + pkt->i_flags |= BLOCK_FLAG_CORRUPTED;
>> + sys->mtu = len;
>> + } else {
>> + len -= shift;
>> + }
>> +
>> + memcpy( pkt->p_buffer, &amtpkt[shift], len );
>> + }
>> + else
>> + len = recvmsg(sys->fd, &msg, 0);
>> +
>> +#ifdef MSG_TRUNC
>> + if (msg.msg_flags & MSG_TRUNC)
>> + {
>> + msg_Err(p_access, "%zd bytes packet truncated (MTU was %zu)",
>> + len, sys->mtu);
>> + pkt->i_flags |= BLOCK_FLAG_CORRUPTED;
>> + sys->mtu = len;
>> + }
>> + else
>> +#endif
>> + pkt->i_buffer = len;
>> +
>> + free( amtpkt );
>> + mem_alloc--;
>> +
>> +/* msg_Dbg( p_access, "BlockUDP: Main Exit: mem_alloc = %d, packet = %d", mem_alloc, packet); */
>
> This can be deleted.
>
>> +
>> + return pkt;
>> +
>> +error:
>> + free( amtpkt );
>> + mem_alloc--;
>> +
>> +/* msg_Dbg( p_access, "BlockUDP: Error Exit: mem_alloc = %d, packet = %d", mem_alloc, packet); */
>> +
>> + return NULL;
>> +}
>> +
>> +/*****************************************************************************
>> + * Open: open the socket
>> + *****************************************************************************/
>> +static int Open( vlc_object_t *p_this )
>> +{
>> + stream_t *p_access = (stream_t*) p_this;
>> + access_sys_t *sys = NULL;
>> + struct addrinfo hints, *serverinfo = NULL;
>> + struct sockaddr_in *server_addr;
>> + char *psz_name = NULL, *saveptr, ip_buffer[INET_ADDRSTRLEN];
>> + int i_bind_port = 1234, i_server_port = 0, VLC_ret = VLC_SUCCESS, res;
>> + vlc_url_t url;
>> +
>> + mem_alloc = 0; packet = 0;
>> +/* msg_Dbg( p_access, "Open: Enter: mem_alloc = %d", mem_alloc);
>
> This can be deleted.
>
>> +
>> + if( p_access->b_preparsing )
>> + {
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + sys = vlc_obj_malloc( p_this, sizeof( *sys ) );
>> + mem_alloc++;
>> +
>> + if( unlikely( sys == NULL ) )
>> + {
>> + VLC_ret = VLC_ENOMEM;
>> + goto cleanup;
>> + }
>> + else
>> + memset( sys, 0, sizeof( *sys ));
>> +
>> + p_access->p_sys = sys;
>> +
>> + /* Set up p_access */
>> + ACCESS_SET_CALLBACKS( NULL, BlockUDP, Control, NULL );
>> +
>> + if( !p_access->psz_location )
>> + {
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + psz_name = strdup( p_access->psz_location );
>> + mem_alloc++;
>> + if ( unlikely( psz_name == NULL ) )
>> + {
>> + VLC_ret = VLC_ENOMEM;
>> + goto cleanup;
>> + }
>> +
>> + /* Parse psz_name syntax :
>> + * [serveraddr[:serverport]][@[bindaddr]:[bindport]] */
>> + if( vlc_UrlParse( &url, p_access->psz_url ) != 0 )
>> + {
>> + msg_Err( p_access, "Invalid URL" );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> + mem_alloc++;
>> +
>> + if( url.i_port > 0 )
>> + i_bind_port = url.i_port;
>> +
>> + msg_Dbg( p_access, "opening multicast: %s:%d local=%s:%d",
>> + url.psz_host, i_server_port, url.psz_path, i_bind_port );
>> +
>> + if( ( url.psz_host == NULL ) || ( strlen( url.psz_host ) == 0 ) )
>> + {
>> + msg_Err( p_access, "Please enter a group and/or source address." );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + memset( &hints, 0, sizeof( hints ));
>> + hints.ai_family = AF_INET; /* Setting to AF_UNSPEC accepts both IPv4 and IPv6 */
>> + hints.ai_socktype = SOCK_DGRAM;
>> +
>> + /* retrieve list of multicast addresses matching the multicast group identifier */
>> + res = vlc_getaddrinfo( url.psz_host, AMT_PORT, &hints, &serverinfo );
>> + mem_alloc++;
>> +
>> + if( res )
>> + {
>> + msg_Err( p_access, "Could not find multicast group %s, reason: %s", url.psz_host, gai_strerror(res) );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + /* Convert binary socket address to string */
>> + server_addr = (struct sockaddr_in *) serverinfo->ai_addr;
>> + inet_ntop(AF_INET, &(server_addr->sin_addr), ip_buffer, INET_ADDRSTRLEN);
>> +
>> + /* release the allocated memory */
>> + freeaddrinfo(serverinfo);
>> + serverinfo = NULL;
>> + mem_alloc--;
>> +
>> + msg_Dbg( p_access, "Setting multicast group address to %s", ip_buffer);
>> +
>> + sys->mcastGroup = strdup( ip_buffer );
>> + mem_alloc++;
>> + if( unlikely( sys->mcastGroup == NULL ) )
>> + {
>> + VLC_ret = VLC_ENOMEM;
>> + goto cleanup;
>> + }
>> +
>> + /* The following uses strtok_r() because strtok() is not thread safe */
>> + sys->srcAddr = strdup( strtok_r( psz_name, "@", &saveptr ) );
>
> You may want to do this in 2 steps to check that strok_r worked as expected.
>
>> + mem_alloc++;
>> +
>> + if( unlikely( sys->srcAddr == NULL ) )
>> + {
>> + VLC_ret = VLC_ENOMEM;
>> + goto cleanup;
>> + }
>> +
>> + /* if strings are equal then no multicast source has been specified */
>> + if( strcmp( url.psz_host, sys->srcAddr ) == 0 )
>> + {
>> + strcpy(sys->srcAddr, "0.0.0.0");
>> + msg_Dbg( p_access, "No multicast source address specified, trying ASM...");
>> + }
>> +
>> + /* retrieve list of source addresses matching the multicast source identifier */
>> + res = vlc_getaddrinfo( sys->srcAddr, AMT_PORT, &hints, &serverinfo );
>> + mem_alloc++;
>> +
>> + if( res )
>> + {
>> + msg_Err( p_access, "Could not find multicast source %s, reason: %s", sys->srcAddr, gai_strerror(res) );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + /* Convert binary socket address to string */
>> + server_addr = (struct sockaddr_in *) serverinfo->ai_addr;
>> + inet_ntop(AF_INET, &(server_addr->sin_addr), ip_buffer, INET_ADDRSTRLEN);
>> +
>> + msg_Dbg( p_access, "Setting multicast source address to %s", ip_buffer);
>> +
>> + /* free the original source address buffer (IP or FQDN) and assign it just the IP address */
>> + free(sys->srcAddr);
>> + sys->srcAddr = strdup( ip_buffer );
>> +
>> + if( unlikely( sys->srcAddr == NULL ) )
>> + {
>> + VLC_ret = VLC_ENOMEM;
>> + goto cleanup;
>> + }
>> +
>> + if( strcmp( url.psz_host, sys->srcAddr ) == 0 )
>> + strcpy(sys->srcAddr, "0.0.0.0");
>> +
>> + sys->relayAddr = var_InheritString( p_access, "amt-relay" );
>> +
>> + if( unlikely(sys->relayAddr == NULL ) )
>> + {
>> + msg_Err( p_access, "No relay anycast or unicast address specified." );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + msg_Dbg( p_access, "Addresses: mcastGroup: %s srcAddr: %s relayAddr: %s", \
>> + sys->mcastGroup, sys->srcAddr, sys->relayAddr);
>> +
>> + sys->fd = net_OpenDgram( p_access, sys->mcastGroup, i_bind_port,
>> + sys->srcAddr, i_server_port, IPPROTO_UDP );
>> + if( sys->fd == -1 )
>> + {
>> + msg_Err( p_access, "cannot open socket" );
>> + VLC_ret = VLC_EGENERIC;
>> + goto cleanup;
>> + }
>> +
>> + sys->mtu = 7 * 188;
>> +
>> + sys->timeout = var_InheritInteger( p_access, "amt-native-timeout");
>> + if( sys->timeout > 0)
>> + sys->timeout *= 1000;
>> +
>> + sys->amtTimeout = var_InheritInteger( p_access, "amt-timeout" );
>> + if( sys->amtTimeout > 0)
>> + sys->amtTimeout *= 1000;
>> +
>> + sys->tryAMT = false;
>> + sys->threadReady = false;
>> +
>> +cleanup: /* fall through */
>> +
>> + /* release the allocated memory */
>> + free( psz_name );
>> + vlc_UrlClean( &url );
>> + freeaddrinfo( serverinfo );
>> +
>> + mem_alloc-=3;
>> +
>> + /* if an error occurred free the memory */
>> + if ( VLC_ret != VLC_SUCCESS )
>> + {
>> + free( sys->mcastGroup );
>> + free( sys->srcAddr );
>> + vlc_obj_free( p_this, sys );
>> + mem_alloc -= 3;
>> + }
>> +
>> +/* msg_Dbg( p_access, "Open: Exit: mem_alloc = %d", mem_alloc); */
>> +
>> + return VLC_ret;
>> +}
>> +
>> +/*****************************************************************************
>> + * Close: free unused data structures
>> + *****************************************************************************/
>> +static void Close( vlc_object_t *p_this )
>> +{
>> + char relay_ip[INET_ADDRSTRLEN];
>> + stream_t *p_access = (stream_t*)p_this;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + inet_ntop(AF_INET, &(sys->relayAddrDisco.sin_addr), relay_ip, INET_ADDRSTRLEN);
>> +
>> + if( strcmp(sys->srcAddr, "0.0.0.0") == 0 )
>> + amt_leaveASM_group( p_access );
>> + else
>> + amt_leaveSSM_group( p_access );
>> + amt_send_mem_update( p_access, relay_ip, true );
>> +
>> + if( sys->threadReady )
>> + {
>> + sys->threadReady = false;
>> + vlc_cancel( sys->updateThread );
>> + vlc_join( sys->updateThread, NULL );
>> + }
>> +
>> + free( sys->mcastGroup );
>> + free( sys->srcAddr );
>> + vlc_obj_free( p_this, sys );
>> +
>> + mem_alloc -= 3;
>> + if (mem_alloc)
>> + msg_Err( p_access, "Closing AMT plugin, mem_alloc = %d", mem_alloc);
>> + else
>> + msg_Dbg( p_access, "Closing AMT plugin, mem_alloc = %d", mem_alloc);
>> +
>> + net_Close( sys->fd );
>> + net_Close( sys->sAMT );
>> + net_Close( sys->sQuery );
>> +}
>> +
>> +
>> +bool open_amt_tunnel( stream_t *p_access )
>> +{
>> + struct addrinfo hints, *serverinfo, *server;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + memset( &hints, 0, sizeof( hints ));
>> + hints.ai_family = AF_INET; /* Setting to AF_UNSPEC accepts both IPv4 and IPv6 */
>> + hints.ai_socktype = SOCK_DGRAM;
>> +
>> +/* msg_Dbg( p_access, "open_amt_tunnel: Enter: mem_alloc = %d", mem_alloc); */
>> +
>> + msg_Dbg( p_access, "Attempting AMT to %s...", sys->relayAddr);
>> + sys->tryAMT = true;
>> +
>> + /* retrieve list of addresses matching the AMT relay */
>> + int res = vlc_getaddrinfo( sys->relayAddr, AMT_PORT, &hints, &serverinfo );
>> + mem_alloc++;
>> +
>> + if( res )
>> + {
>> + msg_Err( p_access, "Could not find relay %s, reason: %s", sys->relayAddr, gai_strerror(res) );
>> + goto error;
>> + }
>> +
>> + /* iterate through the list of sockets to find one the works */
>> + for (server = serverinfo; server != NULL; server = server->ai_next)
>> + {
>> + struct sockaddr_in *server_addr = (struct sockaddr_in *) server->ai_addr;
>> + char relay_ip[INET_ADDRSTRLEN];
>> +
>> + inet_ntop(AF_INET, &(server_addr->sin_addr), relay_ip, INET_ADDRSTRLEN);
>> +
>> + msg_Dbg( p_access, "Trying AMT Server: %s", relay_ip);
>> +
>> + sys->relayAddrDisco.sin_addr = server_addr->sin_addr;
>> +
>> + /* if can't open socket try any others in list */
>> + if( amt_sockets_init( p_access ) != 0 )
>> + msg_Err( p_access, "Error initializing socket to %s", relay_ip );
>> +
>> + /* Otherwise negotiate with AMT relay and confirm you can pull a UDP packet */
>> + else
>> + {
>> + amt_send_relay_discovery_msg( p_access, relay_ip );
>> + msg_Dbg( p_access, "Sent relay AMT discovery message to %s", relay_ip );
>> +
>> + if( !amt_rcv_relay_adv( p_access ) )
>> + {
>> + msg_Err( p_access, "Error receiving AMT relay advertisement msg from %s, skipping", relay_ip );
>> + goto error;
>> + }
>> + msg_Dbg( p_access, "Received AMT relay advertisement from %s", relay_ip );
>> +
>> + amt_send_relay_request( p_access, relay_ip );
>> + msg_Dbg( p_access, "Sent AMT relay request message to %s", relay_ip );
>> +
>> + if( !amt_rcv_relay_mem_query( p_access ) )
>> + {
>> + msg_Err( p_access, "Could not receive AMT relay membership query from %s, reason: %s", relay_ip, vlc_strerror(errno));
>> + goto error;
>> + }
>> + msg_Dbg( p_access, "Received AMT relay membership query from %s", relay_ip );
>> +
>> + if( strcmp(sys->srcAddr, "") == 0 )
>> + {
>> + if( amt_joinASM_group( p_access ) != 0 )
>> + {
>> + msg_Err( p_access, "Error joining ASM %s", vlc_strerror(errno) );
>> + goto error;
>> + }
>> + msg_Dbg( p_access, "Joined ASM group: %s", sys->mcastGroup );
>> + }
>> + else {
>> + if( amt_joinSSM_group( p_access ) != 0 )
>> + {
>> + msg_Err( p_access, "Error joining SSM %s", vlc_strerror(errno) );
>> + goto error;
>> + }
>> + msg_Dbg( p_access, "Joined SSM src: %s group: %s", sys->srcAddr, sys->mcastGroup );
>> + }
>> +
>> + bool eof=false;
>> + block_t *pkt;
>> +
>> + /* Confirm that you can pull a UDP packet from the socket */
>> + if ( (pkt = BlockUDP( p_access, &eof )) == false )
>
> A ! here would be sufficient, checking that a pointer == false is not
> really idiomatic.
>
>> + msg_Dbg( p_access, "Unable to receive UDP packet from AMT relay %s for multicast group %s, skipping...", relay_ip, sys->mcastGroup );
>> + else
>> + {
>> + block_Release(pkt); /* don't decrement mem_alloc since pkt not included in count */
>> + msg_Dbg( p_access, "Got UDP packet from multicast group %s via AMT relay %s, continuing...", sys->mcastGroup, relay_ip );
>> + break; /* found an active server sending UDP packets, so exit loop */
>> + }
>> + }
>> + }
>> +
>> + /* if server is NULL then no AMT relay is responding */
>> + if (server == NULL)
>> + {
>> + msg_Err( p_access, "No AMT servers responding" );
>> + goto error;
>> + }
>> +
>> + sys->queryTime = vlc_tick_now() / CLOCK_FREQ;
>> +
>> + /* release the allocated memory */
>> + freeaddrinfo(serverinfo);
>> + mem_alloc--;
>> +
>> +/* msg_Dbg( p_access, "open_amt_tunnel: Exit: mem_alloc = %d", mem_alloc); */
>
> This can be deleted.
>
>> +
>> + return true;
>> +
>> +error:
>> + /* release the allocated memory */
>> + freeaddrinfo(serverinfo);
>> + mem_alloc--;
>> +
>> +/* msg_Dbg( p_access, "open_amt_tunnel: Exit: mem_alloc = %d", mem_alloc); */
>
> This can be deleted.
>
>> +
>> + sys->threadReady = false;
>> + return false;
>> +}
>> +/**
>> + * Calculate checksum
>> + * */
>> +unsigned short getChecksum( unsigned short *buffer, int nLen )
>> +{
>> + int nleft = nLen;
>> + int sum = 0;
>> + unsigned short *w = buffer;
>> + unsigned short answer = 0;
>> +
>> + while (nleft > 1)
>> + {
>> + sum += *w++;
>> + nleft -= 2;
>> + }
>> + if (nleft == 1)
>> + {
>> + *(unsigned char*)(&answer) = *(unsigned char*)w;
>> + sum += answer;
>> + }
>> + sum = (sum >> 16) + (sum & 0xffff);
>> + answer = ~sum;
>> + return (answer);
>> +}
>> +
>> +/**
>> + * Make IGMP Membership report
>> + * */
>> +void makeReport( amt_igmpv3_membership_report_t *mr )
>> +{
>> + mr->type = AMT_IGMPV3_MEMBERSHIP_REPORT_TYPEID;
>> + mr->resv = 0;
>> + mr->checksum = 0;
>> + mr->resv2 = 0;
>> + mr->nGroupRecord = htons(1);
>> +}
>> +
>> +/**
>> + * Make IP header
>> + * */
>> +void makeIPHeader( amt_ip_alert_t *p_ipHead )
>> +{
>> + p_ipHead->ver_ihl = 0x46;
>> + p_ipHead->tos = 0xc0;
>> + p_ipHead->tot_len = htons( IP_HDR_IGMP_LEN + IGMP_REPORT_LEN );
>> + p_ipHead->id = 0x00;
>> + p_ipHead->frag_off = 0x0000;
>> + p_ipHead->ttl = 0x01;
>> + p_ipHead->protocol = 0x02;
>> + p_ipHead->check = 0;
>> + p_ipHead->srcAddr = INADDR_ANY;
>> + p_ipHead->options = 0x0000;
>> +}
>> +
>> +/** Create relay discovery socket, query socket, UDP socket and
>> + * fills in relay anycast address for discovery
>> + * return 0 if successful, -1 if not
>> + */
>> +int amt_sockets_init( stream_t *p_access )
>> +{
>> + struct sockaddr_in rcvAddr;
>> + access_sys_t *sys = p_access->p_sys;
>> + memset( &rcvAddr, 0, sizeof(struct sockaddr_in) );
>> + int enable = 0, res = 0;
>> +
>> + /* Relay anycast address for discovery */
>> + sys->relayAddrDisco.sin_family = AF_INET;
>> + sys->relayAddrDisco.sin_port = htons( AMT_PORT );
>> +
>> + /* create UDP socket */
>> + sys->sAMT = vlc_socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP, true );
>> + if( sys->sAMT == -1 )
>> + {
>> + msg_Err( p_access, "Failed to create UDP socket" );
>> + goto error;
>> + }
>> +
>> + res = setsockopt(sys->sAMT, IPPROTO_IP, IP_PKTINFO, &enable, sizeof(enable));
>> + if(res < 0)
>> + {
>> + msg_Err( p_access, "Couldn't set socket options for IPPROTO_IP, IP_PKTINFO\n %s", vlc_strerror(errno));
>> + goto error;
>> + }
>> +
>> + res = setsockopt(sys->sAMT, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
>> + if(res < 0)
>> + {
>> + msg_Err( p_access, "Couldn't make socket reusable");
>> + goto error;
>> + }
>> +
>> + rcvAddr.sin_family = AF_INET;
>> + rcvAddr.sin_port = htons( 0 );
>> + rcvAddr.sin_addr.s_addr = INADDR_ANY;
>> +
>> + if( bind(sys->sAMT, (struct sockaddr *)&rcvAddr, sizeof(rcvAddr) ) != 0 )
>> + {
>> + msg_Err( p_access, "Failed to bind UDP socket error: %s", vlc_strerror(errno) );
>> + goto error;
>> + }
>> +
>> + sys->sQuery = vlc_socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP, true );
>> + if( sys->sQuery == -1 )
>> + {
>> + msg_Err( p_access, "Failed to create query socket" );
>> + goto error;
>> + }
>> +
>> + /* bind socket to local address */
>> + sys->stLocalAddr.sin_family = AF_INET;
>> + sys->stLocalAddr.sin_port = htons( 0 );
>> + sys->stLocalAddr.sin_addr.s_addr = INADDR_ANY;
>> +
>> + if( bind(sys->sQuery, (struct sockaddr *)&sys->stLocalAddr, sizeof(struct sockaddr) ) != 0 )
>> + {
>> + msg_Err( p_access, "Failed to bind query socket" );
>> + goto error;
>> + }
>> +
>> + sys->stSvrAddr.sin_family = AF_INET;
>> + sys->stSvrAddr.sin_port = htons( 9124 );
>> + res = inet_pton( AF_INET, "127.0.0.1", &sys->stSvrAddr.sin_addr );
>> + if( res == 0 )
>> + {
>> + msg_Err( p_access, "Could not convert loopback address" );
>> + goto error;
>> + }
>> +
>> + return 0;
>> +
>> +error:
>> + net_Close( sys->sAMT );
>> + net_Close( sys->sQuery );
>> + return -1;
>> +}
>> +
>> +/**
>> + * Send a relay discovery message, before 3-way handshake
>> + * */
>> +void amt_send_relay_discovery_msg( stream_t *p_access, char *relay_ip )
>> +{
>> + char chaSendBuffer[AMT_DISCO_MSG_LEN];
>> + unsigned int ulNonce;
>> + int nRet;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + /* initialize variables */
>> + memset( chaSendBuffer, 0, sizeof(chaSendBuffer) );
>> + ulNonce = 0;
>> + nRet = 0;
>> +
>> + /*
>> + * create AMT discovery message format
>> + * +---------------------------------------------------+
>> + * | Msg Type(1Byte)| Reserved (3 byte)| nonce (4byte) |
>> + * +---------------------------------------------------+
>> + */
>> +
>> + chaSendBuffer[0] = AMT_RELAY_DISCO;
>> + chaSendBuffer[1] = 0;
>> + chaSendBuffer[2] = 0;
>> + chaSendBuffer[3] = 0;
>> +
>> + /* create nonce and copy into send buffer */
>> + srand( (unsigned int)time(NULL) );
>> + ulNonce = htonl( rand() );
>> + memcpy( (void*)&chaSendBuffer[4], (void*)&ulNonce, sizeof(ulNonce) );
>> + sys->glob_ulNonce = ulNonce;
>> +
>> + /* send it */
>> + nRet = sendto( sys->sAMT, chaSendBuffer, sizeof(chaSendBuffer), 0,\
>> + (struct sockaddr *)&sys->relayAddrDisco, sizeof(struct sockaddr) );
>> +
>> + if( nRet < 0)
>> + msg_Err( p_access, "Sendto failed to %s with error %d.", relay_ip, errno);
>> +}
>> +
>> +/**
>> + * Send relay request message, stage 2 of handshake
>> + * */
>> +void amt_send_relay_request( stream_t *p_access, char *relay_ip )
>> +{
>> + char chaSendBuffer[AMT_REQUEST_MSG_LEN];
>> + uint32_t ulNonce;
>> + int nRet;
>> + int nRetry;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + memset( chaSendBuffer, 0, sizeof(chaSendBuffer) );
>> +
>> + ulNonce = 0;
>> + nRet = 0;
>> + nRetry = 0;
>> +
>> + /*
>> + * create AMT request message format
>> + * +-----------------------------------------------------------------+
>> + * | Msg Type(1Byte)| Reserved(1byte)|P flag(1byte)|Reserved (2 byte)|
>> + * +-----------------------------------------------------------------+
>> + * | nonce (4byte) |
>> + * +-----------------------------------------------------------------+
>> + *
>> + * The P flag is set to indicate which group membership protocol the
>> + * gateway wishes the relay to use in the Membership Query response:
>> +
>> + * Value Meaning
>> +
>> + * 0 The relay MUST respond with a Membership Query message that
>> + * contains an IPv4 packet carrying an IGMPv3 General Query
>> + * message.
>> + * 1 The relay MUST respond with a Membership Query message that
>> + * contains an IPv6 packet carrying an MLDv2 General Query
>> + * message.
>> + *
>> + */
>> +
>> + chaSendBuffer[0] = AMT_REQUEST;
>> + chaSendBuffer[1] = 0;
>> + chaSendBuffer[2] = 0;
>> + chaSendBuffer[3] = 0;
>> +
>> + ulNonce = sys->glob_ulNonce;
>> + memcpy( (void*)&chaSendBuffer[4], (void*)&ulNonce, sizeof(uint32_t) );
>> +
>> + nRet = send( sys->sAMT, chaSendBuffer, sizeof(chaSendBuffer), 0 );
>> +
>> + if( nRet < 0 )
>> + msg_Err(p_access, "Error sending relay request to %s error: %s", relay_ip, vlc_strerror(errno) );
>> +}
>> +
>> +/*
>> +* create AMT request message format
>> +* +----------------------------------------------------------------------------------+
>> +* | Msg Type(1 byte)| Reserved (1 byte)| MAC (6 byte)| nonce (4 byte) | IGMP packet |
>> +* +----------------------------------------------------------------------------------+
>> +*/
>> +void amt_send_mem_update( stream_t *p_access, char *relay_ip, bool leave)
>> +{
>> + int sendBufSize = IP_HDR_IGMP_LEN + MAC_LEN + NONCE_LEN + AMT_HDR_LEN;
>> + char pSendBuffer[ sendBufSize + IGMP_REPORT_LEN ];
>> + uint32_t ulNonce = 0;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + memset( &pSendBuffer, 0, sizeof(pSendBuffer) );
>> +
>> + pSendBuffer[0] = AMT_MEM_UPD;
>> +
>> + /* copy relay MAC response */
>> + memcpy( (void*)&pSendBuffer[2], (void*)sys->relay_mem_query_msg.uchaMAC, MAC_LEN );
>> +
>> + /* copy nonce */
>> + ulNonce = ntohl(sys->glob_ulNonce);
>> + memcpy( (void*)&pSendBuffer[8], (void*)&ulNonce, NONCE_LEN );
>> +
>> + /* make IP header for IGMP packet */
>> + amt_ip_alert_t p_ipHead;
>> + memset( &p_ipHead, 0, IP_HDR_IGMP_LEN );
>> + makeIPHeader( &p_ipHead );
>> +
>> + struct sockaddr_in temp;
>> + inet_pton( AF_INET, MCAST_ALLHOSTS, &(temp.sin_addr) );
>> + p_ipHead.destAddr = temp.sin_addr.s_addr;
>> + p_ipHead.check = getChecksum( (unsigned short*)&p_ipHead, IP_HDR_IGMP_LEN );
>> +
>> + amt_igmpv3_groupRecord_t groupRcd;
>> + groupRcd.auxDatalen = 0;
>> + inet_pton( AF_INET, sys->mcastGroup, &(temp.sin_addr) );
>> + groupRcd.ssm = temp.sin_addr.s_addr;
>> +
>> + if( strcmp(sys->srcAddr, "0.0.0.0") != 0 )
>> + {
>> + groupRcd.type = leave ? AMT_IGMP_BLOCK:AMT_IGMP_INCLUDE;
>> + groupRcd.nSrc = htons(1);
>> +
>> + inet_pton( AF_INET, sys->srcAddr, &(temp.sin_addr) );
>> + groupRcd.srcIP[0] = temp.sin_addr.s_addr;
>> +
>> + } else {
>> + groupRcd.type = leave ? AMT_IGMP_INCLUDE_CHANGE:AMT_IGMP_EXCLUDE_CHANGE;
>> + groupRcd.nSrc = htons(0);
>> + }
>> +
>> + /* make IGMP membership report */
>> + amt_igmpv3_membership_report_t p_igmpMemRep;
>> + makeReport( &p_igmpMemRep );
>> +
>> + memcpy((void *)&p_igmpMemRep.grp[0], (void *)&groupRcd, (int)sizeof(groupRcd) );
>> + p_igmpMemRep.checksum = getChecksum( (unsigned short*)&p_igmpMemRep, IGMP_REPORT_LEN );
>> +
>> + amt_membership_update_msg_t memUpdateMsg;
>> + memset((void*)&memUpdateMsg, 0, sizeof(memUpdateMsg));
>> + memcpy((void*)&memUpdateMsg.ipHead, (void*)&p_ipHead, sizeof(p_ipHead) );
>> + memcpy((void*)&memUpdateMsg.memReport, (void*)&p_igmpMemRep, sizeof(p_igmpMemRep) );
>> +
>> + memcpy( (void*)&pSendBuffer[12], (void*)&memUpdateMsg, sizeof(memUpdateMsg) );
>> +
>> + send( sys->sAMT, pSendBuffer, sizeof(pSendBuffer), 0 );
>> +
>> + msg_Dbg( p_access, "AMT relay membership report sent to %s", relay_ip );
>> +}
>> +
>> +/**
>> + * Receive relay advertisement message
>> + *
>> + *
>> + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + * | V=0 |Type=2 | Reserved |
>> + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + * | Discovery Nonce |
>> + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + * | |
>> + * ~ Relay Address (IPv4 or IPv6) ~
>> + * | |
>> + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + * */
>> +bool amt_rcv_relay_adv( stream_t *p_access )
>> +{
>> + char pkt[RELAY_ADV_MSG_LEN];
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + memset( &pkt, 0, RELAY_ADV_MSG_LEN );
>> +
>> + struct pollfd ufd[1];
>> +
>> + ufd[0].fd = sys->sAMT;
>> + ufd[0].events = POLLIN;
>> +
>> + switch( vlc_poll_i11e(ufd, 1, sys->timeout) )
>> + {
>> + case 0:
>> + msg_Err(p_access, "AMT relay advertisement receive time-out");
>> + /* fall through */
>> + case -1:
>> + return false;
>> + }
>> +
>> + struct sockaddr temp;
>> + uint32_t temp_size = sizeof( struct sockaddr );
>> + ssize_t len = recvfrom( sys->sAMT, &pkt, RELAY_ADV_MSG_LEN, 0, &temp, &temp_size );
>> +
>> + if (len < 0)
>> + {
>> + msg_Err(p_access, "Received message length less than zero");
>> + return false;
>> + }
>> +
>> + memcpy( (void*)&sys->relay_adv_msg.type, &pkt[0], MSG_TYPE_LEN );
>> + if( sys->relay_adv_msg.type != AMT_RELAY_ADV )
>> + {
>> + msg_Err( p_access, "Received message not an AMT relay advertisement, ignoring. ");
>> + return false;
>> + }
>> +
>> + memcpy( (void*)&sys->relay_adv_msg.ulRcvNonce, &pkt[NONCE_LEN], NONCE_LEN );
>> + if( sys->glob_ulNonce != sys->relay_adv_msg.ulRcvNonce )
>> + {
>> + msg_Err( p_access, "Discovery nonces differ! currNonce:%x rcvd%x", sys->glob_ulNonce, ntohl(sys->relay_adv_msg.ulRcvNonce) );
>> + return false;
>> + }
>> +
>> + memcpy( (void*)&sys->relay_adv_msg.ipAddr, &pkt[8], 4 );
>> +
>> + memset( &sys->relayAddress, 0, sizeof(sys->relayAddress) );
>> + sys->relayAddress.sin_family = AF_INET;
>> + sys->relayAddress.sin_addr.s_addr = sys->relay_adv_msg.ipAddr;
>> + sys->relayAddress.sin_port = htons( AMT_PORT );
>> +
>> + int nRet = connect( sys->sAMT, (struct sockaddr *)&sys->relayAddress, sizeof(sys->relayAddress) );
>> + if( nRet < 0 )
>> + {
>> + msg_Err( p_access, "Error connecting AMT UDP socket: %s", vlc_strerror(errno) );
>> + return false;
>> + }
>> +
>> + return true;
>> +}
>> +
>> +/**
>> + * Receive relay membership query message
>> + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + | V=0 |Type=4 | Reserved |L|G| Response MAC |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
>> + | |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + | Request Nonce |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + | |
>> + | Encapsulated General Query Message |
>> + ~ IPv4:IGMPv3(Membership Query) ~
>> + | IPv6:MLDv2(Listener Query) |
>> + | |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + | Gateway Port Number | |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
>> + | |
>> + + +
>> + | Gateway IP Address (IPv4 or IPv6) |
>> + + +
>> + | |
>> + + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + | |
>> + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> + */
>> +bool amt_rcv_relay_mem_query( stream_t *p_access )
>> +{
>> + char pkt[RELAY_QUERY_MSG_LEN];
>> + memset( &pkt, 0, RELAY_QUERY_MSG_LEN );
>> + struct pollfd ufd[1];
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + ufd[0].fd = sys->sAMT;
>> + ufd[0].events = POLLIN;
>> +
>> + switch( vlc_poll_i11e(ufd, 1, sys->timeout) )
>> + {
>> + case 0:
>> + msg_Err(p_access, "AMT relay membership query receive time-out");
>> + /* fall through */
>> + case -1:
>> + return false;
>> + }
>> +
>> + ssize_t len = recv( sys->sAMT, &pkt, RELAY_QUERY_MSG_LEN, 0 );
>> +
>> + if (len < 0)
>> + {
>> + msg_Err(p_access, "length less than zero");
>> + return false;
>> + }
>> +
>> + memcpy( (void*)&sys->relay_mem_query_msg.type, &pkt[0], MSG_TYPE_LEN );
>> + /* pkt[1] is reserved */
>> + memcpy( (void*)&sys->relay_mem_query_msg.uchaMAC[0], &pkt[AMT_HDR_LEN], MAC_LEN );
>> + memcpy( (void*)&sys->relay_mem_query_msg.ulRcvedNonce, &pkt[AMT_HDR_LEN + MAC_LEN], NONCE_LEN );
>> + if( sys->relay_mem_query_msg.ulRcvedNonce != sys->glob_ulNonce )
>> + {
>> + msg_Warn( p_access, "Nonces are different rcvd: %x glob: %x", sys->relay_mem_query_msg.ulRcvedNonce, sys->glob_ulNonce );
>> + return false;
>> + }
>> +
>> + sys->glob_ulNonce = ntohl(sys->relay_mem_query_msg.ulRcvedNonce);
>> +
>> + int shift = AMT_HDR_LEN + MAC_LEN + NONCE_LEN;
>> + memcpy( (void*)&sys->relay_ip_hdr, (void*)&pkt[shift], IP_HDR_IGMP_LEN );
>> +
>> + shift += IP_HDR_IGMP_LEN;
>> + sys->relay_igmp_query.type = pkt[shift];
>> + shift++;
>> + sys->relay_igmp_query.max_resp_code = pkt[shift];
>> + shift++;
>> + memcpy( (void*)&sys->relay_igmp_query.checksum, &pkt[shift], 2 );
>> + shift += 2;
>> + memcpy( (void*)&sys->relay_igmp_query.ssmIP, &pkt[shift], 4 );
>> + shift += 4;
>> + sys->relay_igmp_query.s_qrv = pkt[shift];
>> + shift++;
>> + if( (int)pkt[shift] == 0 )
>> + sys->relay_igmp_query.qqic = 125;
>> + else if( (int)pkt[shift] < 128 )
>> + sys->relay_igmp_query.qqic = pkt[shift];
>> + else {
>> + int qqic;
>> + qqic = ((pkt[shift]&0x0f) + 0x10) << (((pkt[shift] >> 4)&0x07) + 3);
>> + sys->relay_igmp_query.qqic = qqic;
>> + }
>> +
>> + shift++;
>> + memcpy( (void*)&sys->relay_igmp_query.nSrc, &pkt[shift], 2 );
>> + if( sys->relay_igmp_query.nSrc != 0 )
>> + {
>> + shift += 2;
>> + memcpy( (void*)&sys->relay_igmp_query.srcIP, &pkt[shift], 4 );
>> + }
>> +
>> + /* if a membership thread exists cancel it */
>> + if( sys->threadReady )
>> + {
>> + msg_Dbg( p_access, "Cancelling existing AMT relay membership update thread");
>> +
>> + sys->threadReady = false;
>> + vlc_cancel( sys->updateThread );
>> + vlc_join( sys->updateThread, NULL );
>> + }
>> +
>> + msg_Dbg( p_access, "Spawning AMT relay membership update thread");
>> +
>> + if( vlc_clone( &sys->updateThread, amt_mem_upd, p_access, VLC_THREAD_PRIORITY_LOW) )
>> + {
>> + msg_Err( p_access, "Could not create AMT relay membership update thread" );
>> + return false;
>> + }
>> +
>> + /* set theadReady to true, thread will send periodic membership updates until false */
>> + sys->threadReady = true;
>> + return true;
>> +}
>> +
>> +/**
>> + * Join SSM group based on input addresses, or use the defaults
>> + * */
>> +int amt_joinSSM_group( stream_t *p_access )
>> +{
>> + struct ip_mreq_source imr;
>> + struct sockaddr_in temp;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + inet_pton( AF_INET, sys->mcastGroup, &(temp.sin_addr.s_addr) );
>> + imr.imr_multiaddr.s_addr = temp.sin_addr.s_addr;
>> +
>> + inet_pton( AF_INET, sys->srcAddr, &(temp.sin_addr.s_addr) );
>> + imr.imr_sourceaddr.s_addr = temp.sin_addr.s_addr;
>> + imr.imr_interface.s_addr = INADDR_ANY;
>> +
>> + return setsockopt( sys->sAMT, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP, (char *)&imr, sizeof(imr) );
>> +}
>> +
>> +int amt_joinASM_group( stream_t *p_access )
>> +{
>> + struct ip_mreq imr;
>> + struct sockaddr_in temp;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + inet_pton( AF_INET, sys->mcastGroup, &(temp.sin_addr.s_addr) );
>> + imr.imr_multiaddr.s_addr = temp.sin_addr.s_addr;
>> + imr.imr_interface.s_addr = INADDR_ANY;
>> +
>> + return setsockopt( sys->sAMT, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&imr, sizeof(imr) );
>> +}
>> +
>> +/**
>> + * Leave SSM group that was joined earlier.
>> + * */
>> +int amt_leaveSSM_group( stream_t *p_access )
>> +{
>> + struct ip_mreq_source imr;
>> + struct sockaddr_in temp;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + inet_pton( AF_INET, sys->mcastGroup, &(temp.sin_addr.s_addr) );
>> + imr.imr_multiaddr.s_addr = temp.sin_addr.s_addr;
>> +
>> + inet_pton( AF_INET, sys->srcAddr, &(temp.sin_addr.s_addr) );
>> + imr.imr_sourceaddr.s_addr = temp.sin_addr.s_addr;
>> + imr.imr_interface.s_addr = INADDR_ANY;
>> +
>> + return setsockopt( sys->sAMT, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP, (char *)&imr, sizeof(imr) );
>> +}
>> +
>> +int amt_leaveASM_group( stream_t *p_access )
>> +{
>> + struct ip_mreq imr;
>> + struct sockaddr_in temp;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + inet_pton( AF_INET, sys->mcastGroup, &(temp.sin_addr.s_addr) );
>> + imr.imr_multiaddr.s_addr = temp.sin_addr.s_addr;
>> + imr.imr_interface.s_addr = INADDR_ANY;
>> +
>> + return setsockopt( sys->sAMT, IPPROTO_IP, IP_DROP_MEMBERSHIP, (char *)&imr, sizeof(imr) );
>> +}
>> +
>> +void *amt_mem_upd( void *data )
>> +{
>> + char relay_ip[INET_ADDRSTRLEN];
>> + stream_t *p_access = (stream_t*) data;
>> + access_sys_t *sys = p_access->p_sys;
>> +
>> + msg_Dbg( p_access, "AMT relay membership update thread started" );
>> +
>> + inet_ntop(AF_INET, &(sys->relayAddrDisco.sin_addr), relay_ip, INET_ADDRSTRLEN);
>> +
>> + /* thread sends periodic AMT membership updates until Close() which clears sys->threadReady and terminates thread */
>> + while ( sys->threadReady )
>> + {
>> + amt_send_mem_update( p_access, relay_ip, false );
>> + vlc_tick_sleep( (vlc_tick_t)sys->relay_igmp_query.qqic * CLOCK_FREQ );
>> + }
>> +
>> + return NULL;
>> +}
>> --
>> 2.17.2 (Apple Git-113)
>>
>> From 72ea76afdb7679f11e19b0ac2cba6c81ec1aed33 Mon Sep 17 00:00:00 2001
>> From: Wayne Brassem <wbrassem at rogers.com>
>> Date: Mon, 14 Jan 2019 18:48:17 -0500
>> Subject: [PATCH 3/3] Modifed function declarations
>>
>> ---
>> modules/access/amt.h | 220 +++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 220 insertions(+)
>> create mode 100644 modules/access/amt.h
>>
>> diff --git a/modules/access/amt.h b/modules/access/amt.h
>> new file mode 100644
>> index 0000000000..7c14365cff
>> --- /dev/null
>> +++ b/modules/access/amt.h
>> @@ -0,0 +1,220 @@
>> +/*****************************************************************************
>> + * @file amt.h
>> + * @brief AMT access module structs
>> + *
>> + * Some of this code was pulled from or based off Cisco's open-source
>> + * SSMAMTtools repo.
>> + * Copyright (c) Juniper Networks, Inc., 2018 - 2018. All rights reserved.
>> + *
>> + * This code is licensed to you under the GNU Lesser General Public License
>> + * version 2.1 or later. You may not use this code except in compliance with
>> + * the GNU Lesser General Public License.
>> + * This code is not an official Juniper product.
>> + *
>> + * Authors: Natalie Landsberg <nlandsberg at juniper.net>
>> + * Wayne Brassem <wbrassem at rogers.com>
>> + *
>> + * This library is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU Lesser General Public License
>> + * as published by the Free Software Foundation; either version 2.1
>> + * of the License, or (at your option) any later version.
>> + *
>> + * This library 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 Lesser General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU Lesser General Public
>> + * License along with this library; if not, write to the Free Software
>> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
>> + ****************************************************************************/
>> +
>> +/*****************************************************************************
>> + * Various Lengths of Msgs or Hdrs
>> + *****************************************************************************/
>> +#define MAC_LEN 6 /* length of generated MAC in bytes */
>> +#define NONCE_LEN 4 /* length of nonce in bytes */
>> +
>> +#define MSG_TYPE_LEN 1 /* length of msg type */
>> +#define RELAY_QUERY_MSG_LEN 48 /* total length of relay query */
>> +#define RELAY_ADV_MSG_LEN 12 /* length of relay advertisement message */
>> +#define IGMP_QUERY_LEN 24 /* length of encapsulated IGMP query message */
>> +#define IGMP_REPORT_LEN 20
>> +#define AMT_HDR_LEN 2 /* length of AMT header on a packet */
>> +#define IP_HDR_LEN 20 /* length of standard IP header */
>> +#define IP_HDR_IGMP_LEN 24 /* length of IP header with an IGMP report */
>> +#define UDP_HDR_LEN 8 /* length of standard UDP header */
>> +#define AMT_REQUEST_MSG_LEN 9
>> +#define AMT_DISCO_MSG_LEN 8
>> +
>> +/*****************************************************************************
>> + * Different AMT Message Types
>> + *****************************************************************************/
>> +#define AMT_RELAY_DISCO 1 /* relay discovery */
>> +#define AMT_RELAY_ADV 2 /* relay advertisement */
>> +#define AMT_REQUEST 3 /* request */
>> +#define AMT_MEM_QUERY 4 /* membership query */
>> +#define AMT_MEM_UPD 5 /* membership update */
>> +#define AMT_MULT_DATA 6 /* multicast data */
>> +#define AMT_TEARDOWN 7 /* teardown (not currently supported) */
>> +
>> +/*****************************************************************************
>> + * Different IGMP Message Types
>> + *****************************************************************************/
>> +#define AMT_IGMPV3_MEMBERSHIP_QUERY_TYPEID 0x11
>> +#define AMT_IGMPV3_MEMBERSHIP_REPORT_TYPEID 0x22
>> +/* IGMPv2, interoperability */
>> +#define AMT_IGMPV1_MEMBERSHIP_REPORT_TYPEID 0x12
>> +#define AMT_IGMPV2_MEMBERSHIP_REPORT_TYPEID 0x16
>> +#define AMT_IGMPV2_MEMBERSHIP_LEAVE_TYPEID 0x17
>> +
>> +#define AMT_IGMP_INCLUDE 0x01
>> +#define AMT_IGMP_EXCLUDE 0x02
>> +#define AMT_IGMP_INCLUDE_CHANGE 0x03
>> +#define AMT_IGMP_EXCLUDE_CHANGE 0x04
>> +#define AMT_IGMP_ALLOW 0x05
>> +#define AMT_IGMP_BLOCK 0x06
>> +
>> +#define MCAST_ALLHOSTS "224.0.0.22"
>> +#define AMT_PORT 2268
>> +
>> +#define DEFAULT_MTU (1500u - (20 + 8))
>> +
>> +typedef struct access_sys_t access_sys_t;
>> +
>> +typedef struct _amt_ip {
>> + uint8_t ver_ihl;
>> + uint8_t tos;
>> + uint16_t tot_len;
>> + uint16_t id;
>> + uint16_t frag_off;
>> + uint8_t ttl;
>> + uint8_t protocol;
>> + uint16_t check;
>> + uint32_t srcAddr;
>> + uint32_t destAddr;
>> +} amt_ip_t;
>> +
>> +typedef struct _amt_ip_alert {
>> + uint8_t ver_ihl;
>> + uint8_t tos;
>> + uint16_t tot_len;
>> + uint16_t id;
>> + uint16_t frag_off;
>> + uint8_t ttl;
>> + uint8_t protocol;
>> + uint16_t check;
>> + uint32_t srcAddr;
>> + uint32_t destAddr;
>> + uint32_t options;
>> +} amt_ip_alert_t;
>> +
>> +typedef struct _amt_igmpv3_groupRecord {
>> + uint8_t type;
>> + uint8_t auxDatalen;
>> + uint16_t nSrc;
>> + uint32_t ssm;
>> + uint32_t srcIP[1];
>> +} amt_igmpv3_groupRecord_t;
>> +
>> +typedef struct _amt_igmpv3_membership_report {
>> + uint8_t type;
>> + uint8_t resv;
>> + uint16_t checksum;
>> + uint16_t resv2;
>> + uint16_t nGroupRecord;
>> + amt_igmpv3_groupRecord_t grp[1];
>> +} amt_igmpv3_membership_report_t;
>> +
>> +typedef struct _amt_igmpv3_membership_query {
>> + uint8_t type;
>> + uint8_t max_resp_code; /* in 100ms, Max Resp Time = (mant | 0x10) << (exp + 3) */
>> + uint32_t checksum;
>> + uint32_t ssmIP;
>> + uint8_t s_qrv;
>> + uint8_t qqic; /* in second, query Time = (mant | 0x10) << (exp + 3) */
>> + uint16_t nSrc;
>> + uint32_t srcIP[1];
>> +} amt_igmpv3_membership_query_t;
>> +
>> +typedef struct _amt_membership_update_msg {
>> + amt_ip_alert_t ipHead;
>> + amt_igmpv3_membership_report_t memReport;
>> +} amt_membership_update_msg_t;
>> +
>> +typedef struct _amt_udpHdr {
>> + uint16_t srcPort;
>> + uint16_t dstPort;
>> + uint16_t len;
>> + uint16_t check;
>> +} amt_udpHdr_t;
>> +
>> +typedef struct _amt_multicast_data {
>> + uint8_t type;
>> + uint8_t resv;
>> + amt_ip_t ip;
>> + amt_udpHdr_t udp;
>> + uint8_t *buf;
>> +} amt_multicast_data_t;
>> +
>> +/* AMT Functions */
>> +int amt_sockets_init( stream_t *p_access );
>> +void amt_send_relay_discovery_msg( stream_t *p_access, char *relay_ip );
>> +void amt_send_relay_request( stream_t *p_access, char *relay_ip );
>> +int amt_joinSSM_group( stream_t *p_access );
>> +int amt_joinASM_group( stream_t *p_access );
>> +int amt_leaveASM_group( stream_t *p_access );
>> +int amt_leaveSSM_group( stream_t *p_access );
>> +bool amt_rcv_relay_adv( stream_t *p_access );
>> +bool amt_rcv_relay_mem_query( stream_t *p_access );
>> +void amt_send_mem_update( stream_t *p_access, char *relay_ip, bool leave );
>> +bool open_amt_tunnel( stream_t *p_access );
>> +void *amt_mem_upd( void *data );
>> +
>> +/* Utility functions */
>> +unsigned short getChecksum( unsigned short *buffer, int nLen );
>> +void makeReport( amt_igmpv3_membership_report_t *mr );
>> +void makeIPHeader( amt_ip_alert_t *p_ipHead );
>
> These should be static and only in amt.c if they are not used outside
> of that file. Also we tend to use snake case rather than camel case.
>
>> +
>> +struct access_sys_t
>> +{
>> + int fd;
>> + int sAMT;
>> + int sQuery;
>> + int timeout;
>> + int amtTimeout;
>> + size_t mtu;
>> + bool tryAMT;
>> + bool threadReady;
>> +
>> + vlc_thread_t updateThread;
>> + vlc_tick_t queryTime;
>> +
>> + char *mcastGroup;
>> + char *srcAddr;
>> + char *relayAddr;
>> +
>> + struct sockaddr_in relayAddrDisco;
>> + struct sockaddr_in relayAddress;
>> + struct sockaddr_in stLocalAddr;
>> + struct sockaddr_in stSvrAddr;
>> +
>> + uint32_t glob_ulNonce;
>> + uint32_t ulRelayNonce;
>> +
>> + struct relay_mem_query_msg_t {
>> + uint8_t type;
>> + uint32_t ulRcvedNonce;
>> + uint8_t uchaMAC[MAC_LEN];
>> + uint8_t uchaIGMP[IGMP_QUERY_LEN];
>> + } relay_mem_query_msg;
>> +
>> + struct relay_adv_msg_t {
>> + uint8_t type;
>> + uint32_t ulRcvNonce;
>> + uint32_t ipAddr;
>> + } relay_adv_msg;
>> +
>> + amt_ip_t relay_ip_hdr;
>> + amt_igmpv3_membership_query_t relay_igmp_query;
>> +};
>
> You may want to reorder this: http://www.catb.org/esr/structure-packing/ <http://www.catb.org/esr/structure-packing/>
>
>> --
>> 2.17.2 (Apple Git-113)
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