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-rw-r--r--backends/rtpmidi.c170
1 files changed, 165 insertions, 5 deletions
diff --git a/backends/rtpmidi.c b/backends/rtpmidi.c
index f77f93b..6a8032a 100644
--- a/backends/rtpmidi.c
+++ b/backends/rtpmidi.c
@@ -1,5 +1,11 @@
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netdb.h>
#include <string.h>
+#include <errno.h>
#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
#include "rtpmidi.h"
@@ -58,10 +64,118 @@ int init(){
return 0;
}
+static int rtpmidi_listener(char* host, char* port){
+ int fd = -1, status, yes = 1, flags;
+ struct addrinfo hints = {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_DGRAM,
+ .ai_flags = AI_PASSIVE
+ };
+ struct addrinfo* info;
+ struct addrinfo* addr_it;
+
+ status = getaddrinfo(host, port, &hints, &info);
+ if(status){
+ fprintf(stderr, "Failed to get socket info for %s port %s: %s\n", host, port, gai_strerror(status));
+ return -1;
+ }
+
+ for(addr_it = info; addr_it != NULL; addr_it = addr_it->ai_next){
+ fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
+ if(fd < 0){
+ continue;
+ }
+
+ yes = 1;
+ if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0){
+ fprintf(stderr, "Failed to set SO_REUSEADDR on socket\n");
+ }
+
+ yes = 1;
+ if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (void*)&yes, sizeof(yes)) < 0){
+ fprintf(stderr, "Failed to set SO_BROADCAST on socket\n");
+ }
+
+ yes = 0;
+ if(setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void*)&yes, sizeof(yes)) < 0){
+ fprintf(stderr, "Failed to unset IP_MULTICAST_LOOP option: %s\n", strerror(errno));
+ }
+
+ status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
+ if(status < 0){
+ close(fd);
+ continue;
+ }
+
+ break;
+ }
+
+ freeaddrinfo(info);
+
+ if(!addr_it){
+ fprintf(stderr, "Failed to create listening socket for %s port %s\n", host, port);
+ return -1;
+ }
+
+ //set nonblocking
+ flags = fcntl(fd, F_GETFL, 0);
+ if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
+ fprintf(stderr, "Failed to set rtpMIDI descriptor nonblocking\n");
+ close(fd);
+ return -1;
+ }
+ return 0;
+}
+
+static int rtpmidi_parse_addr(char* host, char* port, struct sockaddr_storage* addr, socklen_t* len){
+ struct addrinfo* head;
+ struct addrinfo hints = {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_DGRAM
+ };
+
+ int error = getaddrinfo(host, port, &hints, &head);
+ if(error || !head){
+ fprintf(stderr, "Failed to parse address %s port %s: %s\n", host, port, gai_strerror(error));
+ return 1;
+ }
+
+ memcpy(addr, head->ai_addr, head->ai_addrlen);
+ *len = head->ai_addrlen;
+
+ freeaddrinfo(head);
+ return 0;
+}
+
+static int rtpmidi_separate_hostspec(char* in, char** host, char** port, char* default_port){
+ size_t u;
+
+ if(!in || !host || !port){
+ return 1;
+ }
+
+ for(u = 0; in[u] && !isspace(in[u]); u++){
+ }
+
+ //guess
+ *host = in;
+
+ if(in[u]){
+ in[u] = 0;
+ *port = in + u + 1;
+ }
+ else{
+ //no port given
+ *port = default_port;
+ }
+ return 0;
+}
+
static int rtpmidi_configure(char* option, char* value){
if(!strcmp(option, "mdns-name")){
if(cfg.mdns_name){
- free(cfg.mdns_name);
+ fprintf(stderr, "Duplicate mdns-name assignment\n");
+ return 1;
}
cfg.mdns_name = strdup(value);
@@ -69,11 +183,22 @@ static int rtpmidi_configure(char* option, char* value){
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
- //TODO this should create the mdns broadcaster and responder socket
return 0;
}
+ else if(!strcmp(option, "mdns-bind")){
+ if(cfg.mdns_fd >= 0){
+ fprintf(stderr, "Only one mDNS discovery bind is supported\n");
+ return 1;
+ }
+
+
+ //TODO create mdns broadcast/responder socket
+ }
else if(!strcmp(option, "bind")){
- //TODO open listening control and data fds
+ //TODO open listening data fd for raw rtpmidi instance
+ }
+ else if(!strcmp(option, "apple-bind")){
+ //TODO open control and data fd for applemidi session/rtpmidi+apple-extensions instance
}
fprintf(stderr, "Unknown rtpMIDI backend option %s\n", option);
@@ -101,13 +226,48 @@ static int rtpmidi_set(instance* inst, size_t num, channel** c, channel_value* v
}
static int rtpmidi_handle(size_t num, managed_fd* fds){
+ //TODO handle discovery
+
+ if(!num){
+ return 0;
+ }
+
//TODO
return 1;
}
static int rtpmidi_start(){
- //TODO
- return 1;
+ size_t n, u, p;
+ int rv = 1;
+ instance** inst = NULL;
+ rtpmidi_instance_data* data = NULL;
+
+ //fetch all defined instances
+ if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
+ fprintf(stderr, "Failed to fetch instance list\n");
+ return 1;
+ }
+
+ if(!n){
+ free(inst);
+ return 0;
+ }
+
+ if(!cfg.nfds){
+ fprintf(stderr, "Failed to start rtpMIDI backend: no descriptors bound\n");
+ goto bail;
+ }
+
+ if(cfg.mdns_fd < 0){
+ fprintf(stderr, "No mDNS discovery interface bound, APPLEMIDI session support disabled\n");
+ }
+
+ //TODO initialize all instances
+
+ rv = 0;
+bail:
+ free(inst);
+ return rv;
}
static int rtpmidi_shutdown(){