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|
#define BACKEND_NAME "rtpmidi"
//#define DEBUG
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
//mmbackend pulls in windows.h, required before more specific includes
#include "libmmbackend.h"
#include "rtpmidi.h"
#ifdef _WIN32
#include <iphlpapi.h>
#else
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/types.h>
#include <ifaddrs.h>
#endif
//TODO learn peer ssrcs
//TODO default mode?
//TODO internal loop mode
//TODO for some reason, the announce packet generates an exception in the wireshark dns dissector
//TODO rename and document most functions
//TODO timeout non-responsive peers (connected = 0) to allow discovery to reconnect them
/*
* CAVEAT EMPTOR: This is one of the largest backends yet, due to the
* sheer number of protocols involved and their respective complexity.
* The following RFCs may be useful for understanding this backend:
* * RFC 6295 (MIDI Payload for RTP)
* * RFC 1035 (DNS)
* * RFC 6762 (mDNS)
* * RFC 6763 (DNS Service Discovery)
* * RFC 2782 (SRV RR for DNS)
* * To a lesser extent, RFC3550 (RTP)
* Additionally, a strong understanding of the MIDI data stream as well as the details of multicast
* networking for IPv4 and IPv6 are very helpful.
*/
static struct /*_rtpmidi_global*/ {
//mdns is split into v6 and v4 to avoid having to translate ipv6-mapped-ipv4 source addresses
int mdns_fd;
int mdns4_fd;
char* mdns_name;
char* mdns_interface;
#ifdef _WIN32
unsigned mdns_adapter;
unsigned mdns6_adapter;
#endif
uint8_t detect;
uint64_t last_service;
size_t addresses;
rtpmidi_addr* address;
size_t invites;
rtpmidi_invite* invite;
} cfg = {
.mdns_fd = -1,
.mdns4_fd = -1,
.mdns_name = NULL,
.mdns_interface = NULL,
.detect = 0,
.last_service = 0,
.addresses = 0,
.address = NULL,
.invites = 0,
.invite = NULL
};
MM_PLUGIN_API int init(){
backend rtpmidi = {
.name = BACKEND_NAME,
.conf = rtpmidi_configure,
.create = rtpmidi_instance,
.conf_instance = rtpmidi_configure_instance,
.channel = rtpmidi_channel,
.handle = rtpmidi_set,
.interval = rtpmidi_interval,
.process = rtpmidi_handle,
.start = rtpmidi_start,
.shutdown = rtpmidi_shutdown
};
if(sizeof(rtpmidi_channel_ident) != sizeof(uint64_t)){
LOG("Channel identification union out of bounds");
return 1;
}
if(mm_backend_register(rtpmidi)){
LOG("Failed to register backend");
return 1;
}
return 0;
}
static int dns_decode_name(uint8_t* buffer, size_t len, size_t start, dns_name* out){
size_t offset = 0, output_offset = 0;
uint8_t current_label = 0;
uint16_t ptr_target = 0;
//reset output data length and terminate null name
out->length = 0;
if(out->name){
out->name[0] = 0;
}
while(start + offset < len){
current_label = buffer[start + offset];
//if we're at a pointer, move there and stop counting data length
if(DNS_POINTER(current_label)){
if(start + offset + 1 >= len){
LOG("mDNS internal pointer out of bounds");
return 1;
}
//do this before setting the target
if(!ptr_target){
out->length += 2;
}
//calculate pointer target
ptr_target = DNS_LABEL_LENGTH(current_label) << 8 | buffer[start + offset + 1];
if(ptr_target >= len){
LOG("mDNS internal pointer target out of bounds");
return 1;
}
start = ptr_target;
offset = 0;
}
else{
if(DNS_LABEL_LENGTH(current_label) == 0){
if(!ptr_target){
out->length++;
}
break;
}
//check whether we have the bytes we need
if(start + offset + DNS_LABEL_LENGTH(current_label) > len){
LOG("mDNS bytes missing");
return 1;
}
//check whether we have space in the output
if(output_offset + DNS_LABEL_LENGTH(current_label) > out->alloc){
out->name = realloc(out->name, (output_offset + DNS_LABEL_LENGTH(current_label) + 2) * sizeof(uint8_t));
if(!out->name){
LOG("Failed to allocate memory");
return 1;
}
out->alloc = output_offset + DNS_LABEL_LENGTH(current_label);
}
//copy data from this label to output buffer
memcpy(out->name + output_offset, buffer + start + offset + 1, DNS_LABEL_LENGTH(current_label));
output_offset += DNS_LABEL_LENGTH(current_label) + 1;
offset += DNS_LABEL_LENGTH(current_label) + 1;
out->name[output_offset - 1] = '.';
out->name[output_offset] = 0;
if(!ptr_target){
out->length = offset;
}
}
}
return 0;
}
static int dns_encode_name(char* name, dns_name* out){
char* save = NULL, *token = NULL;
out->length = 0;
for(token = strtok_r(name, ".", &save); token; token = strtok_r(NULL, ".", &save)){
//make space for this label, its length and a trailing root label
if(out->alloc < out->length + strlen(token) + 1 + 1 || !out->name){
out->name = realloc(out->name, (out->length + strlen(token) + 2) * sizeof(char));
if(!out->name){
LOG("Failed to allocate memory");
return 1;
}
out->alloc = out->length + strlen(token) + 2;
}
//FIXME check label length before adding
out->name[out->length] = strlen(token);
memcpy(out->name + out->length + 1, token, strlen(token));
out->length += strlen(token) + 1;
}
//last-effort allocate a root buffer
if(!out->alloc){
out->name = calloc(1, sizeof(char));
if(!out->name){
LOG("Failed to allocate memory");
return 1;
}
out->alloc = 1;
}
//add root label
out->name[out->length] = 0;
out->length++;
return 0;
}
static ssize_t dns_push_rr(uint8_t* buffer, size_t length, dns_rr** out, char* name, uint16_t type, uint16_t class, uint32_t ttl, uint16_t len){
dns_rr* rr = NULL;
size_t offset = 0;
dns_name encode = {
.alloc = 0
};
//if requested, encode name
if(name && dns_encode_name(name, &encode)){
LOGPF("Failed to encode DNS name %s", name);
goto bail;
}
if(encode.length + sizeof(dns_rr) > length){
LOGPF("Failed to encode DNS name %s, insufficient space", name);
goto bail;
}
if(name){
//copy encoded name to buffer
memcpy(buffer, encode.name, encode.length);
offset += encode.length;
}
rr = (dns_rr*) (buffer + offset);
rr->rtype = htobe16(type);
rr->rclass = htobe16(class);
rr->ttl = htobe32(ttl);
rr->data = htobe16(len);
offset += sizeof(dns_rr);
if(out){
*out = rr;
}
free(encode.name);
return offset;
bail:
free(encode.name);
return -1;
}
static int rtpmidi_announce_addrs(){
char repr[INET6_ADDRSTRLEN + 1] = "", iface[2048] = "";
union {
struct sockaddr_in* in4;
struct sockaddr_in6* in6;
struct sockaddr* in;
} addr;
#ifdef _WIN32
IP_ADAPTER_UNICAST_ADDRESS_LH* unicast_addr = NULL;
IP_ADAPTER_ADDRESSES addrs[250] , *iter = NULL;
size_t bytes_alloc = sizeof(addrs);
unsigned long status = GetAdaptersAddresses(0, GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER,
NULL, addrs, (unsigned long*) &bytes_alloc);
if(status != ERROR_SUCCESS){
//FIXME might try to resize the result list and retry at some point...
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, status,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), iface, sizeof(iface), NULL);
LOGPF("Failed to query local interface addresses (%lu): %s", status, iface);
return 1;
}
for(iter = addrs; iter; iter = iter->Next){
//friendlyname is a wide string, print it into interface for basic conversion and to avoid implementing wide string handling
snprintf(iface, sizeof(iface), "%S", iter->FriendlyName);
//filter interfaces if requested
if(cfg.mdns_interface && strncmp(iface, cfg.mdns_interface, min(strlen(iface), strlen(cfg.mdns_interface)))){
continue;
}
//for exact matches, use exactly this interface for multicasts
if(!strcmp(iface, cfg.mdns_interface)){
LOGPF("Using interface %s for mDNS discovery", iface);
cfg.mdns_adapter = iter->IfIndex;
cfg.mdns6_adapter = iter->Ipv6IfIndex;
}
for(unicast_addr = (IP_ADAPTER_UNICAST_ADDRESS_LH*) iter->FirstUnicastAddress; unicast_addr; unicast_addr = unicast_addr->Next){
addr.in = unicast_addr->Address.lpSockaddr;
#else
struct ifaddrs* ifa = NULL, *iter = NULL;
if(getifaddrs(&ifa)){
LOGPF("Failed to get adapter address information: %s", mmbackend_socket_strerror(errno));
return 1;
}
for(iter = ifa; iter; iter = iter->ifa_next){
if((!cfg.mdns_interface || !strcmp(cfg.mdns_interface, iter->ifa_name))
&& strcmp(iter->ifa_name, "lo")
&& iter->ifa_addr){
snprintf(iface, sizeof(iface), "%s", iter->ifa_name);
addr.in = iter->ifa_addr;
#endif
if(addr.in->sa_family != AF_INET && addr.in->sa_family != AF_INET6){
continue;
}
cfg.address = realloc(cfg.address, (cfg.addresses + 1) * sizeof(rtpmidi_addr));
if(!cfg.address){
cfg.addresses = 0;
LOG("Failed to allocate memory");
return 1;
}
cfg.address[cfg.addresses].family = addr.in->sa_family;
memcpy(&cfg.address[cfg.addresses].addr,
(addr.in->sa_family == AF_INET) ? (void*) &addr.in4->sin_addr.s_addr : (void*) &addr.in6->sin6_addr.s6_addr,
(addr.in->sa_family == AF_INET) ? 4 : 16);
LOGPF("mDNS announce address %" PRIsize_t ": %s (from %s)", cfg.addresses, mmbackend_sockaddr_ntop(addr.in, repr, sizeof(repr)), iface);
cfg.addresses++;
}
}
#ifndef _WIN32
freeifaddrs(ifa);
#endif
if(!cfg.addresses){
LOG("Failed to gather local IP addresses for mDNS announce");
return 1;
}
return 0;
}
static uint32_t rtpmidi_interval(){
return max(0, (int64_t) RTPMIDI_SERVICE_INTERVAL - (int64_t) (mm_timestamp() - cfg.last_service));
}
static int rtpmidi_configure(char* option, char* value){
if(!strcmp(option, "mdns-name")){
if(cfg.mdns_name){
LOG("Duplicate mdns-name assignment");
return 1;
}
return mmbackend_strdup(&cfg.mdns_name, value);
}
else if(!strcmp(option, "mdns-interface")){
if(cfg.mdns_interface){
LOG("Duplicate mdns-interface assignment");
return 1;
}
return mmbackend_strdup(&cfg.mdns_interface, value);
}
else if(!strcmp(option, "detect")){
cfg.detect = 0;
if(!strcmp(value, "on")){
cfg.detect = 1;
}
return 0;
}
LOGPF("Unknown backend configuration option %s", option);
return 1;
}
static int rtpmidi_bind_instance(instance* inst, rtpmidi_instance_data* data, char* host, char* port){
struct sockaddr_storage sock_addr = {
0
};
socklen_t sock_len = sizeof(sock_addr);
char control_port[32];
//bind to random port if none supplied
data->fd = mmbackend_socket(host, port ? port : "0", SOCK_DGRAM, 1, 0, 1);
if(data->fd < 0){
return 1;
}
if(getsockname(data->fd, (struct sockaddr*) &sock_addr, &sock_len)){
LOGPF("Failed to fetch data port information: %s", mmbackend_socket_strerror(errno));
return 1;
}
//bind control port
if(data->mode == apple){
data->control_port = be16toh(((struct sockaddr_in*) &sock_addr)->sin_port) - 1;
snprintf(control_port, sizeof(control_port), "%d", data->control_port);
data->control_fd = mmbackend_socket(host, control_port, SOCK_DGRAM, 1, 0, 1);
if(data->control_fd < 0){
LOGPF("Failed to bind control port %s for instance %s", control_port, inst->name);
return 1;
}
LOGPF("Apple mode instance %s listening on ports %d (control) and %d (data)", inst->name, data->control_port, data->control_port + 1);
}
else{
data->control_port = be16toh(((struct sockaddr_in*)&sock_addr)->sin_port);
LOGPF("Direct mode instance %s listening on port %d", inst->name, data->control_port);
}
return 0;
}
static char* rtpmidi_type_name(uint8_t type){
switch(type){
case note:
return "note";
case cc:
return "cc";
case pressure:
return "pressure";
case aftertouch:
return "aftertouch";
case pitchbend:
return "pitch";
case program:
return "program";
case rpn:
return "rpn";
case nrpn:
return "nrpn";
}
return "unknown";
}
static int rtpmidi_push_peer(rtpmidi_instance_data* data, struct sockaddr* sock_addr, socklen_t sock_len, uint8_t learned, uint8_t connected, ssize_t invite_reference){
size_t u, p = data->peers;
for(u = 0; u < data->peers; u++){
//check whether the peer is already in the list
//TODO this probably should take into account the invite_reference (-1 for initiator peers or if unknown but may be present)
if(data->peer[u].active
&& sock_len == data->peer[u].dest_len
&& !memcmp(&data->peer[u].dest, sock_addr, sock_len)){
//if yes, update connection flag (but not learned flag because that doesn't change)
data->peer[u].connected = connected;
return 0;
}
if(!data->peer[u].active){
p = u;
}
}
if(p == data->peers){
data->peer = realloc(data->peer, (data->peers + 1) * sizeof(rtpmidi_peer));
if(!data->peer){
LOG("Failed to allocate memory");
data->peers = 0;
return 1;
}
data->peers++;
DBGPF("Extending peer registry to %" PRIsize_t " entries", data->peers);
}
data->peer[p].active = 1;
data->peer[p].learned = learned;
data->peer[p].connected = connected;
data->peer[p].invite = invite_reference;
memcpy(&(data->peer[p].dest), sock_addr, sock_len);
data->peer[p].dest_len = sock_len;
return 0;
}
static int rtpmidi_push_invite(instance* inst, char* peer){
size_t u, p;
//check whether the instance is already in the inviter list
for(u = 0; u < cfg.invites; u++){
if(cfg.invite[u].inst == inst){
break;
}
}
//add to the inviter list
if(u == cfg.invites){
cfg.invite = realloc(cfg.invite, (cfg.invites + 1) * sizeof(rtpmidi_invite));
if(!cfg.invite){
LOG("Failed to allocate memory");
cfg.invites = 0;
return 1;
}
cfg.invite[u].inst = inst;
cfg.invite[u].invites = 0;
cfg.invite[u].name = NULL;
cfg.invites++;
}
//check whether the requested name is already in the invite list for this instance
for(p = 0; p < cfg.invite[u].invites; p++){
if(!strcmp(cfg.invite[u].name[p], peer)){
return 0;
}
}
//extend the invite list
cfg.invite[u].name = realloc(cfg.invite[u].name, (cfg.invite[u].invites + 1) * sizeof(char*));
if(!cfg.invite[u].name){
LOG("Failed to allocate memory");
cfg.invite[u].invites = 0;
return 1;
}
//append the new invitee
cfg.invite[u].name[p] = strdup(peer);
if(!cfg.invite[u].name[p]){
LOG("Failed to allocate memory");
return 1;
}
cfg.invite[u].invites++;
return 0;
}
static int rtpmidi_applecommand(instance* inst, struct sockaddr* dest, socklen_t dest_len, uint8_t control, applemidi_command command, uint32_t token){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
ssize_t bytes = 0;
apple_command* cmd = (apple_command*) &frame;
cmd->res1 = 0xFFFF;
cmd->command = htobe16(command);
cmd->version = htobe32(2);
cmd->token = token ? token : (((uint32_t) rand()) << 16 | rand());
cmd->ssrc = htobe32(data->ssrc);
//append session name to packet
memcpy(frame + sizeof(apple_command), inst->name, strlen(inst->name) + 1);
//FIXME should we match sending/receiving ports? if the reference does this, it should be documented
bytes = sendto(control ? data->control_fd : data->fd, frame, sizeof(apple_command) + strlen(inst->name) + 1, 0, dest, dest_len);
if(bytes != sizeof(apple_command) + strlen(inst->name) + 1){
LOGPF("Failed to transmit session command on %s: %s", inst->name, mmbackend_socket_strerror(errno));
return 1;
}
return 0;
}
static int rtpmidi_peer_applecommand(instance* inst, size_t peer, uint8_t control, applemidi_command command, uint32_t token){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
struct sockaddr_storage dest_addr;
memcpy(&dest_addr, &(data->peer[peer].dest), min(sizeof(dest_addr), data->peer[peer].dest_len));
if(control){
//calculate remote control port from data port
((struct sockaddr_in*) &dest_addr)->sin_port = htobe16(be16toh(((struct sockaddr_in*) &dest_addr)->sin_port) - 1);
}
return rtpmidi_applecommand(inst, (struct sockaddr*) &dest_addr, data->peer[peer].dest_len, control, command, token);
}
static int rtpmidi_configure_instance(instance* inst, char* option, char* value){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
char* host = NULL, *port = NULL;
struct sockaddr_storage sock_addr;
socklen_t sock_len = sizeof(sock_addr);
if(!strcmp(option, "mode")){
if(!strcmp(value, "direct")){
data->mode = direct;
return 0;
}
else if(!strcmp(value, "apple")){
data->mode = apple;
return 0;
}
LOGPF("Unknown instance mode %s for instance %s", value, inst->name);
return 1;
}
else if(!strcmp(option, "epn-tx")){
data->epn_tx_short = 0;
if(!strcmp(value, "short")){
data->epn_tx_short = 1;
}
return 0;
}
else if(!strcmp(option, "ssrc")){
data->ssrc = strtoul(value, NULL, 0);
if(!data->ssrc){
LOGPF("Random SSRC will be generated for instance %s", inst->name);
}
return 0;
}
else if(!strcmp(option, "bind")){
if(data->mode == unconfigured){
LOGPF("Please specify mode for instance %s before setting bind host", inst->name);
return 1;
}
mmbackend_parse_hostspec(value, &host, &port, NULL);
if(!host){
LOGPF("Could not parse bind host specification %s for instance %s", value, inst->name);
return 1;
}
return rtpmidi_bind_instance(inst, data, host, port);
}
else if(!strcmp(option, "learn")){
if(data->mode != direct){
LOG("'learn' option is only valid for direct mode instances");
return 1;
}
data->learn_peers = 0;
if(!strcmp(value, "true")){
data->learn_peers = 1;
}
return 0;
}
else if(!strcmp(option, "peer")){
if(data->mode == unconfigured){
LOGPF("Please specify mode for instance %s before configuring peers", inst->name);
return 1;
}
mmbackend_parse_hostspec(value, &host, &port, NULL);
if(!host || !port){
LOGPF("Invalid peer %s configured on instance %s", value, inst->name);
return 1;
}
if(mmbackend_parse_sockaddr(host, port, &sock_addr, &sock_len)){
LOGPF("Failed to resolve peer %s on instance %s", value, inst->name);
return 1;
}
//apple peers are specified using the control port, but we want to store the data port as peer
if(data->mode == apple){
((struct sockaddr_in*) &sock_addr)->sin_port = htobe16(be16toh(((struct sockaddr_in*) &sock_addr)->sin_port) + 1);
}
return rtpmidi_push_peer(data, (struct sockaddr*) &sock_addr, sock_len, 0, 0, -1);
}
else if(!strcmp(option, "invite")){
if(data->mode != apple){
LOG("'invite' option is only valid for apple mode instances");
return 1;
}
return rtpmidi_push_invite(inst, value);
}
else if(!strcmp(option, "join")){
if(data->mode != apple){
LOG("'join' option is only valid for apple mode instances");
return 1;
}
return mmbackend_strdup(&data->accept, value);
}
LOGPF("Unknown instance configuration option %s on instance %s", option, inst->name);
return 1;
}
static int rtpmidi_instance(instance* inst){
rtpmidi_instance_data* data = calloc(1, sizeof(rtpmidi_instance_data));
if(!data){
LOG("Failed to allocate memory");
return 1;
}
data->fd = -1;
data->control_fd = -1;
inst->impl = data;
return 0;
}
static channel* rtpmidi_channel(instance* inst, char* spec, uint8_t flags){
char* next_token = spec;
rtpmidi_channel_ident ident = {
.label = 0
};
if(!strncmp(spec, "ch", 2)){
next_token += 2;
if(!strncmp(spec, "channel", 7)){
next_token = spec + 7;
}
}
else{
LOGPF("Invalid channel specification %s", spec);
return NULL;
}
ident.fields.channel = strtoul(next_token, &next_token, 10);
if(ident.fields.channel > 15){
LOGPF("Channel out of range in channel spec %s", spec);
return NULL;
}
if(*next_token != '.'){
LOGPF("Channel specification %s does not conform to channel<X>.<control><Y>", spec);
return NULL;
}
next_token++;
if(!strncmp(next_token, "cc", 2)){
ident.fields.type = cc;
next_token += 2;
}
else if(!strncmp(next_token, "note", 4)){
ident.fields.type = note;
next_token += 4;
}
else if(!strncmp(next_token, "rpn", 3)){
ident.fields.type = rpn;
next_token += 3;
}
else if(!strncmp(next_token, "nrpn", 4)){
ident.fields.type = nrpn;
next_token += 4;
}
else if(!strncmp(next_token, "pressure", 8)){
ident.fields.type = pressure;
next_token += 8;
}
else if(!strncmp(next_token, "pitch", 5)){
ident.fields.type = pitchbend;
}
else if(!strncmp(next_token, "aftertouch", 10)){
ident.fields.type = aftertouch;
}
else if(!strncmp(next_token, "program", 7)){
ident.fields.type = program;
}
else{
LOGPF("Unknown control type in spec %s", spec);
return NULL;
}
ident.fields.control = strtoul(next_token, NULL, 10);
if(ident.label){
return mm_channel(inst, ident.label, 1);
}
return NULL;
}
static size_t rtpmidi_push_midi(uint8_t* payload, size_t bytes_left, uint8_t type, uint8_t channel, uint8_t control, uint16_t value){
//FIXME this is a bit simplistic but it works for now
if(bytes_left < 4){
return 0;
}
//encode timestamp
payload[0] = 0;
//encode midi command
payload[1] = type | channel;
payload[2] = control;
payload[3] = value & 0x7F;
if(type == pitchbend){
payload[2] = value & 0x7F;
payload[3] = (value >> 7) & 0x7F;
}
//channel-wides aftertouch and program are only 2 bytes
else if(type == aftertouch || type == program){
payload[2] = payload[3];
return 3;
}
return 4;
}
static int rtpmidi_set(instance* inst, size_t num, channel** c, channel_value* v){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
rtpmidi_header* rtp_header = (rtpmidi_header*) frame;
rtpmidi_command_header* command_header = (rtpmidi_command_header*) (frame + sizeof(rtpmidi_header));
size_t offset = sizeof(rtpmidi_header) + sizeof(rtpmidi_command_header), u = 0;
uint8_t* payload = frame + offset;
rtpmidi_channel_ident ident;
size_t command_length = 0;
rtp_header->vpxcc = RTPMIDI_HEADER_MAGIC;
//some receivers seem to have problems reading rfcs and interpreting the marker bit correctly
rtp_header->mpt = (data->mode == apple ? 0 : 0x80) | RTPMIDI_HEADER_TYPE;
rtp_header->sequence = htobe16(data->sequence++);
rtp_header->timestamp = mm_timestamp() * 10; //just assume 100msec resolution because rfc4695 handwaves it
rtp_header->ssrc = htobe32(data->ssrc);
//midi command section header
//TODO enable the journal bit here
command_header->flags = 0xA0; //extended length header, first entry in list has dtime
//midi list
for(u = 0; u < num; u++){
ident.label = c[u]->ident;
switch(ident.fields.type){
case rpn:
case nrpn:
//transmit parameter number
command_length = rtpmidi_push_midi(payload + offset, sizeof(frame) - offset, cc, ident.fields.channel, (ident.fields.type == rpn) ? 101 : 99, (ident.fields.control >> 7) & 0x7F);
command_length += rtpmidi_push_midi(payload + offset + command_length, sizeof(frame) - offset, cc, ident.fields.channel, (ident.fields.type == rpn) ? 100 : 98, ident.fields.control & 0x7F);
//transmit parameter value
command_length += rtpmidi_push_midi(payload + offset + command_length, sizeof(frame) - offset, cc, ident.fields.channel, 6, (((uint16_t) (v[u].normalised * 16383.0)) >> 7) & 0x7F);
command_length += rtpmidi_push_midi(payload + offset + command_length, sizeof(frame) - offset, cc, ident.fields.channel, 38, ((uint16_t) (v[u].normalised * 16383.0)) & 0x7F);
if(!data->epn_tx_short){
//clear active parameter
command_length += rtpmidi_push_midi(payload + offset + command_length, sizeof(frame) - offset, cc, ident.fields.channel, 101, 127);
command_length += rtpmidi_push_midi(payload + offset + command_length, sizeof(frame) - offset, cc, ident.fields.channel, 100, 127);
}
break;
case pitchbend:
//TODO check whether this works
command_length = rtpmidi_push_midi(payload + offset, sizeof(frame) - offset, ident.fields.type, ident.fields.channel, ident.fields.control, v[u].normalised * 16383.0);
break;
default:
command_length = rtpmidi_push_midi(payload + offset, sizeof(frame) - offset, ident.fields.type, ident.fields.channel, ident.fields.control, v[u].normalised * 127.0);
}
if(command_length == 0){
LOGPF("Transmit buffer size exceeded on %s", inst->name);
break;
}
offset += command_length;
}
//update command section length
//FIXME this might overrun, might check the number of events at some point
command_header->flags |= (((offset - sizeof(rtpmidi_header) - sizeof(rtpmidi_command_header)) & 0x0F00) >> 8);
command_header->length = ((offset - sizeof(rtpmidi_header) - sizeof(rtpmidi_command_header)) & 0xFF);
//TODO journal section
for(u = 0; u < data->peers; u++){
if(data->peer[u].active && data->peer[u].connected){
sendto(data->fd, frame, offset, 0, (struct sockaddr*) &data->peer[u].dest, data->peer[u].dest_len);
}
}
return 0;
}
static int rtpmidi_handle_applemidi(instance* inst, int fd, uint8_t* frame, size_t bytes, struct sockaddr_storage* peer, socklen_t peer_len){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t response[RTPMIDI_PACKET_BUFFER] = "";
apple_command* command = (apple_command*) frame;
char* session_name = (char*) frame + sizeof(apple_command);
size_t n, u;
command->command = be16toh(command->command);
//check command version (except for clock sync and receiver feedback)
if(command->command != apple_sync && command->command != apple_feedback
&& be32toh(command->version) != 2){
LOGPF("Invalid AppleMIDI command version %" PRIu32 " on instance %s", be32toh(command->version), inst->name);
return 0;
}
if(command->command == apple_invite){
//check session name
for(n = sizeof(apple_command); n < bytes; n++){
if(!frame[n]){
break;
}
if(!isprint(frame[n])){
session_name = NULL;
break;
}
}
//unterminated string
if(n == bytes){
session_name = NULL;
}
//FIXME if already in session, reject the invitation
if(data->accept &&
(!strcmp(data->accept, "*") || (session_name && !strcmp(session_name, data->accept)))){
//accept the invitation
LOGPF("Instance %s accepting invitation to session %s%s", inst->name, session_name ? session_name : "UNNAMED", (fd == data->control_fd) ? " (control)":"");
//send accept message
rtpmidi_applecommand(inst, (struct sockaddr*) peer, peer_len, (fd == data->control_fd) ? 1 : 0, apple_accept, command->token);
//push peer
if(fd != data->control_fd){
return rtpmidi_push_peer(data, (struct sockaddr*) peer, peer_len, 1, 1, -1);
}
return 0;
}
else{
//send reject message
LOGPF("Instance %s rejecting invitation to session %s", inst->name, session_name ? session_name : "UNNAMED");
rtpmidi_applecommand(inst, (struct sockaddr*) peer, peer_len, (fd == data->control_fd) ? 1 : 0, apple_reject, command->token);
}
return 0;
}
else if(command->command == apple_accept){
if(fd != data->control_fd){
LOGPF("Instance %s negotiated new peer", inst->name);
return rtpmidi_push_peer(data, (struct sockaddr*) peer, peer_len, 1, 1, -1);
//FIXME store ssrc, start timesync
}
else{
//invite peer data port
LOGPF("Instance %s peer accepted on control port, inviting data port", inst->name);
//calculate data port
((struct sockaddr_in*) peer)->sin_port = htobe16(be16toh(((struct sockaddr_in*) peer)->sin_port) + 1);
//send invite
rtpmidi_applecommand(inst, (struct sockaddr*) peer, peer_len, 0, apple_invite, 0);
}
return 0;
}
else if(command->command == apple_reject){
//just ignore this for now and retry the invitation
LOGPF("Invitation rejected on instance %s", inst->name);
}
else if(command->command == apple_leave){
//remove peer from list - this comes in on the control port, but we need to remove the data port...
((struct sockaddr_in*) peer)->sin_port = htobe16(be16toh(((struct sockaddr_in*) peer)->sin_port) + 1);
for(u = 0; u < data->peers; u++){
if(data->peer[u].dest_len == peer_len
&& !memcmp(&data->peer[u].dest, peer, peer_len)){
LOGPF("Instance %s removed peer", inst->name);
//learned peers are marked inactive, configured peers are marked unconnected
if(data->peer[u].learned){
data->peer[u].active = 0;
}
else{
data->peer[u].connected = 0;
}
}
}
return 0;
}
else if(command->command == apple_sync){
//respond with sync answer
memcpy(response, frame, bytes);
apple_sync_frame* sync = (apple_sync_frame*) response;
DBGPF("Incoming sync on instance %s (%d)", inst->name, sync->count);
sync->command = htobe16(apple_sync);
sync->ssrc = htobe32(data->ssrc);
switch(sync->count){
case 0:
//this happens if we're a participant
sync->count++;
sync->timestamp[1] = htobe64(mm_timestamp() * 10);
break;
case 1:
//this happens if we're an initiator
sync->count++;
sync->timestamp[2] = htobe64(mm_timestamp() * 10);
break;
default:
//ignore this one
return 0;
}
if(sendto(fd, response, sizeof(apple_sync_frame), 0, (struct sockaddr*) peer, peer_len) != sizeof(apple_sync_frame)){
LOG("Failed to output sync frame");
}
return 0;
}
else if(command->command == apple_feedback){
//TODO store this somewhere to properly update the recovery journal
LOGPF("Feedback on instance %s", inst->name);
return 0;
}
else{
LOGPF("Unknown AppleMIDI session command %04X", command->command);
}
return 0;
}
//this state machine was copied more-or-less verbatim from the alsa midi implementation - fixes there will need to be integrated
static void rtpmidi_handle_epn(instance* inst, uint8_t chan, uint16_t control, uint16_t value){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
rtpmidi_channel_ident ident = {
.label = 0
};
channel* changed = NULL;
channel_value val;
//switching between nrpn and rpn clears all valid bits
if(((data->epn_status[chan] & EPN_NRPN) && (control == 101 || control == 100))
|| (!(data->epn_status[chan] & EPN_NRPN) && (control == 99 || control == 98))){
data->epn_status[chan] &= ~(EPN_NRPN | EPN_PARAMETER_LO | EPN_PARAMETER_HI);
}
//setting an address always invalidates the value valid bits
if(control >= 98 && control <= 101){
data->epn_status[chan] &= ~EPN_VALUE_HI;
}
//parameter hi
if(control == 101 || control == 99){
data->epn_control[chan] &= 0x7F;
data->epn_control[chan] |= value << 7;
data->epn_status[chan] |= EPN_PARAMETER_HI | ((control == 99) ? EPN_NRPN : 0);
if(control == 101 && value == 127){
data->epn_status[chan] &= ~EPN_PARAMETER_HI;
}
}
//parameter lo
if(control == 100 || control == 98){
data->epn_control[chan] &= ~0x7F;
data->epn_control[chan] |= value & 0x7F;
data->epn_status[chan] |= EPN_PARAMETER_LO | ((control == 98) ? EPN_NRPN : 0);
if(control == 100 && value == 127){
data->epn_status[chan] &= ~EPN_PARAMETER_LO;
}
}
//value hi, clears low, mark as update candidate
if(control == 6
//check if parameter is set before accepting value update
&& ((data->epn_status[chan] & (EPN_PARAMETER_HI | EPN_PARAMETER_LO)) == (EPN_PARAMETER_HI | EPN_PARAMETER_LO))){
data->epn_value[chan] = value << 7;
data->epn_status[chan] |= EPN_VALUE_HI;
}
//value lo, flush the value
if(control == 38
&& data->epn_status[chan] & EPN_VALUE_HI){
data->epn_value[chan] &= ~0x7F;
data->epn_value[chan] |= value & 0x7F;
data->epn_status[chan] &= ~EPN_VALUE_HI;
if(cfg.detect){
LOGPF("Incoming EPN data on channel %s.ch%d.%s%d", inst->name, chan, data->epn_status[chan] & EPN_NRPN ? "nrpn" : "rpn", data->epn_control[chan]);
}
//find the updated channel
ident.fields.type = data->epn_status[chan] & EPN_NRPN ? nrpn : rpn;
ident.fields.channel = chan;
ident.fields.control = data->epn_control[chan];
val.normalised = (double) data->epn_value[chan] / 16383.0;
//push the new value
changed = mm_channel(inst, ident.label, 0);
if(changed){
mm_channel_event(changed, val);
}
}
}
static int rtpmidi_parse(instance* inst, uint8_t* frame, size_t bytes){
uint16_t length = 0;
size_t offset = 1, decode_time = 0, command_bytes = 0;
uint8_t midi_status = 0;
rtpmidi_channel_ident ident;
channel_value val;
channel* chan = NULL;
if(!bytes){
LOGPF("No command section in data on instance %s", inst->name);
return 1;
}
//calculate midi command section length
length = frame[0] & 0x0F;
if(frame[0] & 0x80){
//extended header
if(bytes < 2){
LOGPF("Short command section (%" PRIsize_t " bytes) on %s, missing extended header", bytes, inst->name);
return 1;
}
length <<= 8;
length |= frame[1];
offset = 2;
}
command_bytes = offset + length;
DBGPF("%u/%" PRIsize_t " bytes of command section on %s, %s header, %s initial dtime",
length, bytes, inst->name,
(frame[0] & 0x80) ? "extended" : "normal",
(frame[0] & 0x20) ? "has" : "no");
if(command_bytes > bytes){
LOGPF("Short command section on %s, indicated %" PRIsize_t ", had %" PRIsize_t, inst->name, command_bytes, bytes);
return 1;
}
if(frame[0] & 0x20){
decode_time = 1;
}
do{
//decode (and ignore) delta-time
if(decode_time){
for(; offset < command_bytes && frame[offset] & 0x80; offset++){
}
offset++;
}
//section 3 of rfc6295 states that the first dtime as well as the last command may be omitted
//this may make sense on a low-speed serial line, but on a network... come on.
if(offset >= command_bytes){
break;
}
//check for a status byte
//TODO filter sysex
if(frame[offset] & 0x80){
midi_status = frame[offset];
offset++;
}
//having variable encoding in each and every component is super annoying to check for...
if(offset >= command_bytes){
break;
}
ident.label = 0;
ident.fields.type = midi_status & 0xF0;
ident.fields.channel = midi_status & 0x0F;
//single byte command
if(ident.fields.type == aftertouch || ident.fields.type == program){
ident.fields.control = 0;
val.normalised = (double) frame[offset] / 127.0;
val.raw.u64 = frame[offset];
offset++;
}
//two-byte command
else{
offset++;
if(offset >= command_bytes){
break;
}
if(ident.fields.type == pitchbend){
ident.fields.control = 0;
val.normalised = (double)((frame[offset] << 7) | frame[offset - 1]) / 16383.0;
val.raw.u64 = (frame[offset] << 7) | frame[offset - 1];
}
else{
ident.fields.control = frame[offset - 1];
val.normalised = (double) frame[offset] / 127.0;
val.raw.u64 = frame[offset];
}
//fix-up note off events
if(ident.fields.type == 0x80){
ident.fields.type = note;
val.normalised = 0;
val.raw.u64 = 0;
}
offset++;
}
DBGPF("Decoded command type %02X channel %d control %d value %f",
ident.fields.type, ident.fields.channel, ident.fields.control, val.normalised);
//forward EPN CCs to the EPN state machine
if(ident.fields.type == cc
&& ((ident.fields.control <= 101 && ident.fields.control >= 98)
|| ident.fields.control == 6
|| ident.fields.control == 38)){
rtpmidi_handle_epn(inst, ident.fields.channel, ident.fields.control, val.raw.u64);
}
if(cfg.detect){
if(ident.fields.type == pitchbend
|| ident.fields.type == aftertouch
|| ident.fields.type == program){
LOGPF("Incoming data on channel %s.ch%d.%s, value %f",
inst->name, ident.fields.channel,
rtpmidi_type_name(ident.fields.type), val.normalised);
}
else{
LOGPF("Incoming data on channel %s.ch%d.%s%d, value %f",
inst->name, ident.fields.channel,
rtpmidi_type_name(ident.fields.type),
ident.fields.control, val.normalised);
}
}
//push event
chan = mm_channel(inst, ident.label, 0);
if(chan){
mm_channel_event(chan, val);
}
decode_time = 1;
} while(offset < command_bytes);
return 0;
}
static int rtpmidi_handle_data(instance* inst){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
struct sockaddr_storage sock_addr;
socklen_t sock_len = sizeof(sock_addr);
rtpmidi_header* rtp_header = (rtpmidi_header*) frame;
ssize_t bytes_recv = recvfrom(data->fd, frame, sizeof(frame), 0, (struct sockaddr*) &sock_addr, &sock_len);
size_t u;
//TODO receive until EAGAIN
if(bytes_recv < 0){
LOGPF("Failed to receive for instance %s", inst->name);
return 1;
}
if(bytes_recv < sizeof(rtpmidi_header)){
LOGPF("Skipping short packet on instance %s", inst->name);
return 0;
}
//FIXME might want to filter data input from sources that are not registered peers
if(data->mode == apple && rtp_header->vpxcc == 0xFF && rtp_header->mpt == 0xFF){
return rtpmidi_handle_applemidi(inst, data->fd, frame, bytes_recv, &sock_addr, sock_len);
}
else if(rtp_header->vpxcc != RTPMIDI_HEADER_MAGIC || RTPMIDI_GET_TYPE(rtp_header->mpt) != RTPMIDI_HEADER_TYPE){
LOGPF("Frame with invalid header magic on %s", inst->name);
return 0;
}
//parse data
if(rtpmidi_parse(inst, frame + sizeof(rtpmidi_header), bytes_recv - sizeof(rtpmidi_header))){
//returning errors here fails the core loop, so just return 0 to have some logging
return 0;
}
//try to learn peers
if(data->learn_peers){
for(u = 0; u < data->peers; u++){
if(data->peer[u].active
&& data->peer[u].dest_len == sock_len
&& !memcmp(&data->peer[u].dest, &sock_addr, sock_len)){
break;
}
}
if(u == data->peers){
LOGPF("Learned new peer on %s", inst->name);
return rtpmidi_push_peer(data, (struct sockaddr*) &sock_addr, sock_len, 1, 1, -1);
}
}
return 0;
}
static int rtpmidi_handle_control(instance* inst){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
struct sockaddr_storage sock_addr;
socklen_t sock_len = sizeof(sock_addr);
ssize_t bytes_recv = recvfrom(data->control_fd, frame, sizeof(frame), 0, (struct sockaddr*) &sock_addr, &sock_len);
if(bytes_recv < 0){
LOGPF("Failed to receive on control socket for instance %s", inst->name);
return 1;
}
//the shortest applemidi packet is still larger than the rtpmidi header, so use that as bar
if(bytes_recv < sizeof(rtpmidi_header)){
LOGPF("Skipping short packet on control socket of instance %s", inst->name);
return 0;
}
if(data->mode == apple && frame[0] == 0xFF && frame[1] == 0xFF){
return rtpmidi_handle_applemidi(inst, data->control_fd, frame, bytes_recv, &sock_addr, sock_len);
}
LOGPF("Unknown session protocol frame received on instance %s", inst->name);
return 0;
}
static int rtpmidi_mdns_broadcast(uint8_t* frame, size_t len){
struct sockaddr_in mcast = {
.sin_family = AF_INET,
.sin_port = htobe16(5353),
.sin_addr.s_addr = htobe32(((uint32_t) 0xe00000fb))
};
struct sockaddr_in6 mcast6 = {
.sin6_family = AF_INET6,
.sin6_port = htobe16(5353),
.sin6_addr.s6_addr = {0xff, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xfb}
};
//send to ipv4 and ipv6 mcasts
sendto(cfg.mdns_fd, frame, len, 0, (struct sockaddr*) &mcast6, sizeof(mcast6));
sendto(cfg.mdns4_fd, frame, len, 0, (struct sockaddr*) &mcast, sizeof(mcast));
return 0;
}
static int rtpmidi_mdns_detach(instance* inst){
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
dns_header* hdr = (dns_header*) frame;
dns_rr* rr = NULL;
dns_name name = {
.alloc = 0
};
size_t offset = 0;
ssize_t bytes = 0;
hdr->id = 0;
hdr->flags[0] = 0x84;
hdr->flags[1] = 0;
hdr->questions = hdr->servers = hdr->additional = 0;
hdr->answers = htobe16(1);
offset = sizeof(dns_header);
//answer 1: _apple-midi PTR FQDN
snprintf((char*) frame + offset, sizeof(frame) - offset, "%s", RTPMIDI_MDNS_DOMAIN);
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, (char*) frame + offset, 12, 1, 0, 0);
if(bytes < 0){
goto bail;
}
offset += bytes;
//TODO length-checks here
frame[offset++] = strlen(inst->name);
memcpy(frame + offset, inst->name, strlen(inst->name));
offset += strlen(inst->name);
frame[offset++] = 0xC0;
frame[offset++] = sizeof(dns_header);
rr->data = htobe16(1 + strlen(inst->name) + 2);
free(name.name);
return rtpmidi_mdns_broadcast(frame, offset);
bail:
free(name.name);
return 1;
}
//FIXME this should not exceed 1500 bytes
static int rtpmidi_mdns_announce(instance* inst){
rtpmidi_instance_data* data = (rtpmidi_instance_data*) inst->impl;
uint8_t frame[RTPMIDI_PACKET_BUFFER] = "";
dns_header* hdr = (dns_header*) frame;
dns_rr* rr = NULL;
dns_rr_srv* srv = NULL;
dns_name name = {
.alloc = 0
};
size_t offset = 0, host_offset = 0, u = 0;
ssize_t bytes = 0;
hdr->id = 0;
hdr->flags[0] = 0x84;
hdr->flags[1] = 0;
hdr->questions = hdr->servers = 0;
hdr->answers = htobe16(4);
hdr->additional = htobe16(cfg.addresses);
offset = sizeof(dns_header);
//answer 1: SRV FQDN
snprintf((char*) frame + offset, sizeof(frame) - offset, "%s.%s", inst->name, RTPMIDI_MDNS_DOMAIN);
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, (char*) frame + offset, 33, 1, 120, 0);
if(bytes < 0){
goto bail;
}
offset += bytes;
srv = (dns_rr_srv*) (frame + offset);
srv->priority = 0;
srv->weight = 0;
srv->port = htobe16(data->control_port);
offset += sizeof(dns_rr_srv);
//rfc2782 (srv) says to not compress `target`, rfc6762 (mdns) 18.14 says to
//we don't do it because i don't want to
snprintf((char*) frame + offset, sizeof(frame) - offset, "%s.local", cfg.mdns_name);
if(dns_encode_name((char*) frame + offset, &name)){
LOGPF("Failed to encode name for %s", frame + offset);
goto bail;
}
memcpy(frame + offset, name.name, name.length);
offset += name.length;
rr->data = htobe16(sizeof(dns_rr_srv) + name.length);
//answer 2: empty TXT (apple asks for it otherwise)
frame[offset++] = 0xC0;
frame[offset++] = sizeof(dns_header);
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, NULL, 16, 1, 4500, 1);
if(bytes < 0){
goto bail;
}
offset += bytes;
frame[offset++] = 0x00; //zero-length TXT
//answer 3: dns-sd PTR _applemidi
snprintf((char*) frame + offset, sizeof(frame) - offset, "%s", RTPMIDI_DNSSD_DOMAIN);
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, (char*) frame + offset, 12, 1, 4500, 2);
if(bytes < 0){
goto bail;
}
offset += bytes;
//add backref for PTR
frame[offset++] = 0xC0;
frame[offset++] = sizeof(dns_header) + frame[sizeof(dns_header)] + 1;
//answer 4: _applemidi PTR FQDN
frame[offset++] = 0xC0;
frame[offset++] = sizeof(dns_header) + frame[sizeof(dns_header)] + 1;
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, NULL, 12, 1, 4500, 2);
if(bytes < 0){
goto bail;
}
offset += bytes;
//add backref for PTR
frame[offset++] = 0xC0;
frame[offset++] = sizeof(dns_header);
//additional 1: first announce addr
host_offset = offset;
snprintf((char*) frame + offset, sizeof(frame) - offset, "%s.local", cfg.mdns_name);
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, (char*) frame + offset,
(cfg.address[0].family == AF_INET) ? 1 : 28, 1, 120,
(cfg.address[0].family == AF_INET) ? 4 : 16);
if(bytes < 0){
return 1;
}
offset += bytes;
memcpy(frame + offset, cfg.address[0].addr, (cfg.address[0].family == AF_INET) ? 4 : 16);
offset += (cfg.address[0].family == AF_INET) ? 4 : 16;
//push all other announce addresses with a pointer
for(u = 1; u < cfg.addresses; u++){
frame[offset++] = 0xC0 | (host_offset >> 8);
frame[offset++] = host_offset & 0xFF;
bytes = dns_push_rr(frame + offset, sizeof(frame) - offset, &rr, (char*) frame + offset,
(cfg.address[u].family == AF_INET) ? 1 : 28, 1, 120,
(cfg.address[u].family == AF_INET) ? 4 : 16);
if(bytes < 0){
return 1;
}
offset += bytes;
memcpy(frame + offset, cfg.address[u].addr, (cfg.address[u].family == AF_INET) ? 4 : 16);
offset += (cfg.address[u].family == AF_INET) ? 4 : 16;
}
data->last_announce = mm_timestamp();
free(name.name);
return rtpmidi_mdns_broadcast(frame, offset);
bail:
free(name.name);
return 1;
}
static int rtpmidi_service(){
size_t n, u, p;
instance** inst = NULL;
rtpmidi_instance_data* data = NULL;
struct sockaddr_storage control_peer;
//prepare commands
apple_sync_frame sync = {
.res1 = 0xFFFF,
.command = htobe16(apple_sync),
.ssrc = 0,
.count = 0,
.timestamp = {
mm_timestamp() * 10
}
};
if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
LOG("Failed to fetch instances");
return 1;
}
for(u = 0; u < n; u++){
data = (rtpmidi_instance_data*) inst[u]->impl;
if(data->mode == apple){
//mdns discovery
if((cfg.mdns_fd >= 0 || cfg.mdns4_fd >= 0)
&& (!data->last_announce || mm_timestamp() - data->last_announce > RTPMIDI_ANNOUNCE_INTERVAL)){
rtpmidi_mdns_announce(inst[u]);
}
for(p = 0; p < data->peers; p++){
if(data->peer[p].active && data->peer[p].connected){
//apple sync
DBGPF("Instance %s initializing sync on peer %" PRIsize_t, inst[u]->name, p);
sync.ssrc = htobe32(data->ssrc);
//calculate remote control port from data port
memcpy(&control_peer, &(data->peer[u].dest), sizeof(control_peer));
((struct sockaddr_in*) &control_peer)->sin_port = htobe16(be16toh(((struct sockaddr_in*) &control_peer)->sin_port) - 1);
if(sendto(data->control_fd, (char*) &sync, sizeof(apple_sync_frame), 0, (struct sockaddr*) &control_peer, data->peer[u].dest_len) != sizeof(apple_sync_frame)){
LOG("Failed to output sync frame");
}
}
else if(data->peer[p].active && !data->peer[p].learned && (mm_timestamp() / 1000) % 10 == 0){
//try to invite pre-defined unconnected applemidi peers
DBGPF("Instance %s inviting configured peer %" PRIsize_t, inst[u]->name, p);
rtpmidi_peer_applecommand(inst[u], p, 1, apple_invite, 0);
}
}
}
}
free(inst);
return 0;
}
static int rtpmidi_apple_peermatch(uint8_t* session_raw, struct sockaddr* peer, socklen_t peer_len, uint16_t control_port){
//due to mdns restrictions, session names can at most be 255 characters long
char session_name[1024] = "";
rtpmidi_instance_data* data = NULL;
size_t u, n, p;
uint8_t done = 0;
//modify peer to match the data port for the indicated control port
((struct sockaddr_in*) peer)->sin_port = htobe16(control_port + 1);
snprintf(session_name, sizeof(session_name), "%.*s", session_raw[0], session_raw + 1);
//find instances that invite exactly this peer
for(u = 0; u < cfg.invites; u++){
for(n = 0; n < cfg.invite[u].invites; n++){
if(strlen(cfg.invite[u].name[n]) == session_raw[0]
&& !strcmp(cfg.invite[u].name[n], session_name)){
done = 1;
data = (rtpmidi_instance_data*) cfg.invite[u].inst->impl;
DBGPF("Peer %s explicitly invited on instance %s", session_name, cfg.invite[u].inst->name);
//check whether this peer (or its equivalent on another protocol) is already connected
for(p = 0; p < data->peers; p++){
//FIXME might want to scan for explicitly configured peers that match the announced peer
if(data->peer[p].active
&& data->peer[p].learned
&& data->peer[p].invite == n){
//we already learned of this peer
break;
}
}
if(p == data->peers){
//push a new peer
if(rtpmidi_push_peer(data, peer, peer_len, 1, 0, n)){
return 1;
}
//find it again
for(p = 0; p < data->peers; p++){
if(data->peer[p].active
&& data->peer[p].learned
&& data->peer[p].invite == n){
//we already learned of this peer
break;
}
}
}
else{
//if connected, we're done for this instance
//if not, at least the family should match
if(data->peer[p].connected
|| data->peer[p].dest.ss_family != peer->sa_family){
break;
}
//if not connected and family matches, overwrite
memcpy(&(data->peer[p].dest), peer, data->peer[p].dest_len);
}
//connect either the pushed or overwritten peer
LOGPF("Inviting peer %s to instance %s", session_name, cfg.invite[u].inst->name);
rtpmidi_peer_applecommand(cfg.invite[u].inst, p, 1, apple_invite, 0);
}
}
}
//if we found at least one match before, we don't check wildcard invites
if(done){
return 0;
}
//find instances with a wildcard invite
for(u = 0; u < cfg.invites; u++){
for(n = 0; n < cfg.invite[u].invites; n++){
if(!strcmp(cfg.invite[u].name[n], "*")){
done = 1;
DBGPF("Peer %s implicitly invited on instance %s, converting to explicit invitation", session_name, cfg.invite[u].inst->name);
if(rtpmidi_push_invite(cfg.invite[u].inst, session_name)){
return 1;
}
}
}
}
//recurse to connect now-explicit invitations
if(done){
rtpmidi_apple_peermatch(session_raw, peer, peer_len, control_port);
}
return 0;
}
//TODO bounds check all accesses
static int rtpmidi_parse_announce(uint8_t* buffer, size_t length, dns_header* hdr, dns_name* name, dns_name* host, struct sockaddr* source, socklen_t source_len){
dns_rr* rr = NULL;
dns_rr_srv* srv = NULL;
size_t u = 0, offset = sizeof(dns_header);
uint8_t* session_name = NULL;
char peer_name[1024];
for(u = 0; u < hdr->questions; u++){
if(dns_decode_name(buffer, length, offset, name)){
LOG("Failed to decode DNS label");
return 1;
}
offset += name->length;
offset += sizeof(dns_question);
}
//look for a SRV answer for ._apple-midi._udp.local.
for(u = 0; u < hdr->answers; u++){
if(dns_decode_name(buffer, length, offset, name)){
LOG("Failed to decode DNS label");
return 1;
}
//store a pointer to the first label in the current path
//since we decoded the name successfully before and dns_decode_name performs bounds checking, this _should_ be ok
session_name = (DNS_POINTER(buffer[offset])) ? buffer + (DNS_LABEL_LENGTH(buffer[offset]) << 8 | buffer[offset + 1]) : buffer + offset;
offset += name->length;
rr = (dns_rr*) (buffer + offset);
offset += sizeof(dns_rr);
if(be16toh(rr->rtype) == 33
&& strlen(name->name) > strlen(RTPMIDI_MDNS_DOMAIN)
&& !strcmp(name->name + (strlen(name->name) - strlen(RTPMIDI_MDNS_DOMAIN)), RTPMIDI_MDNS_DOMAIN)){
//decode the srv data
srv = (dns_rr_srv*) (buffer + offset);
offset += sizeof(dns_rr_srv);
if(dns_decode_name(buffer, length, offset, host)){
LOG("Failed to decode SRV target");
return 1;
}
if(!strncmp(host->name, cfg.mdns_name, strlen(cfg.mdns_name)) && host->name[strlen(cfg.mdns_name)] == '.'){
//ignore loopback packets, we don't care about them
return 0;
}
//we just use the packet's source as peer, because who would announce mdns for another host (also implementing an additional registry for this would bloat this backend further)
LOGPF("Detected possible peer %.*s on %s (%s) Port %d", session_name[0], session_name + 1, host->name, mmbackend_sockaddr_ntop(source, peer_name, sizeof(peer_name)), be16toh(srv->port));
offset -= sizeof(dns_rr_srv);
rtpmidi_apple_peermatch(session_name, source, source_len, be16toh(srv->port));
}
offset += be16toh(rr->data);
}
return 0;
}
static int rtpmidi_handle_mdns(int fd){
uint8_t buffer[RTPMIDI_PACKET_BUFFER];
dns_header* hdr = (dns_header*) buffer;
dns_name name = {
.alloc = 0
}, host = name;
ssize_t bytes = 0;
struct sockaddr_storage peer_addr;
socklen_t peer_len = sizeof(peer_addr);
#ifdef DEBUG
char peer_name[INET6_ADDRSTRLEN + 1];
#endif
for(bytes = recvfrom(fd, buffer, sizeof(buffer), 0, (struct sockaddr*) &peer_addr, &peer_len);
bytes > 0;
bytes = recvfrom(fd, buffer, sizeof(buffer), 0, (struct sockaddr*) &peer_addr, &peer_len)){
if(bytes < sizeof(dns_header)){
continue;
}
//decode basic header
hdr->id = be16toh(hdr->id);
hdr->questions = be16toh(hdr->questions);
hdr->answers = be16toh(hdr->answers);
hdr->servers = be16toh(hdr->servers);
hdr->additional = be16toh(hdr->additional);
//rfc6762 18.3: opcode != 0 -> ignore
//rfc6762 18.11: response code != 0 -> ignore
DBGPF("%" PRIsize_t " bytes on v%c, ID %d, Opcode %d, %s, %d questions, %d answers, %d servers, %d additional, src %s",
bytes, (fd == cfg.mdns_fd ? '6' : '4'), hdr->id,
DNS_OPCODE(hdr->flags[0]), DNS_RESPONSE(hdr->flags[0]) ? "response" : "query",
hdr->questions, hdr->answers, hdr->servers, hdr->additional,
mmbackend_sockaddr_ntop((struct sockaddr*) &peer_addr, peer_name, sizeof(peer_name)));
rtpmidi_parse_announce(buffer, bytes, hdr, &name, &host, (struct sockaddr*) &peer_addr, peer_len);
peer_len = sizeof(peer_addr);
}
free(name.name);
free(host.name);
#ifdef _WIN32
if(WSAGetLastError() == WSAEWOULDBLOCK){
#else
if(errno == EAGAIN){
#endif
return 0;
}
LOGPF("Error reading from mDNS descriptor: %s", mmbackend_socket_strerror(errno));
return 1;
}
static int rtpmidi_handle(size_t num, managed_fd* fds){
size_t u;
int rv = 0;
instance* inst = NULL;
rtpmidi_instance_data* data = NULL;
//handle service tasks (mdns, clock sync, peer connections)
if(mm_timestamp() - cfg.last_service > RTPMIDI_SERVICE_INTERVAL){
//DBGPF("Performing service tasks, delta %" PRIu64, mm_timestamp() - cfg.last_service);
if(rtpmidi_service()){
return 1;
}
cfg.last_service = mm_timestamp();
}
for(u = 0; u < num; u++){
if(!fds[u].impl){
//handle mDNS discovery input
rtpmidi_handle_mdns(fds[u].fd);
}
else{
//handle rtp/control input
inst = (instance*) fds[u].impl;
data = (rtpmidi_instance_data*) inst->impl;
if(fds[u].fd == data->fd){
rv |= rtpmidi_handle_data(inst);
}
else if(fds[u].fd == data->control_fd){
rv |= rtpmidi_handle_control(inst);
}
else{
LOG("Signaled for unknown descriptor");
}
}
}
return rv;
}
static int rtpmidi_start_mdns(){
//use ip_mreqn where possible, but that renames the interface member
#ifdef _WIN32
struct ip_mreq mcast_req = {
.imr_interface.s_addr = INADDR_ANY,
#else
struct ip_mreqn mcast_req = {
.imr_address.s_addr = INADDR_ANY,
#endif
.imr_multiaddr.s_addr = htobe32(((uint32_t) 0xe00000fb))
};
struct ipv6_mreq mcast6_req = {
.ipv6mr_multiaddr.s6_addr = {0xff, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xfb},
.ipv6mr_interface = 0
};
if(!cfg.mdns_name){
LOG("No mDNS name set, disabling AppleMIDI discovery");
return 0;
}
if(cfg.mdns_interface){
#ifdef _WIN32
mcast6_req.ipv6mr_interface = cfg.mdns6_adapter;
mcast_req.imr_interface.s_addr = htobe32(cfg.mdns_adapter);
#else
mcast6_req.ipv6mr_interface = if_nametoindex(cfg.mdns_interface);
mcast_req.imr_ifindex = if_nametoindex(cfg.mdns_interface);
#endif
}
//FIXME might try passing NULL as host here to work around possible windows ipv6 handicaps
cfg.mdns_fd = mmbackend_socket(RTPMIDI_DEFAULT_HOST, RTPMIDI_MDNS_PORT, SOCK_DGRAM, 1, 1, 0);
cfg.mdns4_fd = mmbackend_socket(RTPMIDI_DEFAULT4_HOST, RTPMIDI_MDNS_PORT, SOCK_DGRAM, 1, 1, 0);
if(cfg.mdns_fd < 0 && cfg.mdns4_fd < 0){
LOG("Failed to create requested mDNS descriptors");
return 1;
}
//join ipv4 multicast group
if(cfg.mdns4_fd >= 0 && setsockopt(cfg.mdns4_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (uint8_t*) &mcast_req, sizeof(mcast_req))){
LOGPF("Failed to join IPv4 multicast group for mDNS, discovery may be impaired: %s", mmbackend_socket_strerror(errno));
}
//join ipv6 multicast group
if(cfg.mdns_fd >= 0 && setsockopt(cfg.mdns_fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (uint8_t*) &mcast6_req, sizeof(mcast6_req))){
LOGPF("Failed to join IPv6 multicast group for mDNS, discovery may be impaired: %s", mmbackend_socket_strerror(errno));
}
//register mdns fd to core
return mm_manage_fd(cfg.mdns_fd, BACKEND_NAME, 1, NULL) | mm_manage_fd(cfg.mdns4_fd, BACKEND_NAME, 1, NULL);
}
static int rtpmidi_start(size_t n, instance** inst){
size_t u, p, fds = 0;
rtpmidi_instance_data* data = NULL;
uint8_t mdns_requested = 0;
for(u = 0; u < n; u++){
data = (rtpmidi_instance_data*) inst[u]->impl;
//check whether instances are explicitly configured to a mode
if(data->mode == unconfigured){
LOGPF("Instance %s is missing a mode configuration", inst[u]->name);
return 1;
}
//generate random ssrc's
if(!data->ssrc){
data->ssrc = ((uint32_t) rand()) << 16 | rand();
}
//if not bound, bind to default
if(data->fd < 0 && rtpmidi_bind_instance(inst[u], data, RTPMIDI_DEFAULT_HOST, NULL)){
LOGPF("Failed to bind default sockets for instance %s", inst[u]->name);
return 1;
}
//mark configured peers on direct instances as connected so output is sent
//apple mode instances go through the session negotiation before marking peers as active
if(data->mode == direct){
for(p = 0; p < data->peers; p++){
data->peer[p].connected = 1;
}
}
else if(data->mode == apple){
mdns_requested = 1;
}
//register fds to core
if(mm_manage_fd(data->fd, BACKEND_NAME, 1, inst[u]) || (data->control_fd >= 0 && mm_manage_fd(data->control_fd, BACKEND_NAME, 1, inst[u]))){
LOGPF("Failed to register descriptor for instance %s with core", inst[u]->name);
return 1;
}
fds += (data->control_fd >= 0) ? 2 : 1;
}
if(mdns_requested && (rtpmidi_announce_addrs() || rtpmidi_start_mdns())){
LOG("Failed to set up mDNS discovery, instances may not show up on remote hosts and may not find remote peers");
}
else if(mdns_requested){
fds += 2;
}
LOGPF("Registered %" PRIsize_t " descriptors to core", fds);
return 0;
}
static int rtpmidi_shutdown(size_t n, instance** inst){
rtpmidi_instance_data* data = NULL;
size_t u, p;
for(u = 0; u < n; u++){
data = (rtpmidi_instance_data*) inst[u]->impl;
if((cfg.mdns_fd >= 0 || cfg.mdns4_fd >= 0) && data->mode == apple){
rtpmidi_mdns_detach(inst[u]);
}
if(data->fd >= 0){
close(data->fd);
}
if(data->control_fd >= 0){
close(data->control_fd);
}
free(data->accept);
data->accept = NULL;
free(data->peer);
data->peer = NULL;
data->peers = 0;
free(inst[u]->impl);
inst[u]->impl = NULL;
}
for(u = 0; u < cfg.invites; u++){
for(p = 0; p < cfg.invite[u].invites; p++){
free(cfg.invite[u].name[p]);
}
free(cfg.invite[u].name);
}
free(cfg.invite);
cfg.invite = NULL;
cfg.invites = 0;
free(cfg.address);
cfg.addresses = 0;
free(cfg.mdns_name);
cfg.mdns_name = NULL;
free(cfg.mdns_interface);
cfg.mdns_interface = NULL;
if(cfg.mdns_fd >= 0){
close(cfg.mdns_fd);
}
if(cfg.mdns4_fd >= 0){
close(cfg.mdns4_fd);
}
LOG("Backend shut down");
return 0;
}
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