From: michael <michael>
Date: Sat, 1 Jul 2006 18:07:29 +0000 (+0000)
Subject: implement (probably working) multicast
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/record-dvb/commitdiff_plain/fbc24ab023eb1ae6572fccff3fa1140c3e01c8b7

implement (probably working) multicast
---

diff --git a/common.c b/common.c
index 97ec807..80327f5 100644
--- a/common.c
+++ b/common.c
@@ -2,6 +2,9 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
 
 #include "common.h"
 
@@ -62,3 +65,28 @@ struct dvb_host *parse(char *urlpart, char *defport)
 
 	return dvbhost;
 }
+
+int resolve(struct dvb_host *dvbhost, struct sockaddr_in *server)
+{
+	struct addrinfo *s_addrinfo, addrhints;
+	int res;
+
+	bzero(&addrhints, sizeof(struct addrinfo));
+	addrhints.ai_family = PF_INET;
+	addrhints.ai_socktype = dvbhost->socktype;
+
+	if ((res = getaddrinfo(dvbhost->hostname, dvbhost->port, &addrhints, &s_addrinfo))) {
+		fprintf(stderr,"getaddrinfo: %s\n",gai_strerror(res));
+		return -1;
+	}
+
+	bzero(server, sizeof(struct sockaddr_in));
+	server->sin_family = AF_INET;
+	server->sin_addr.s_addr = ((struct sockaddr_in*)(s_addrinfo->ai_addr))->sin_addr.s_addr;
+	server->sin_port = ((struct sockaddr_in*)(s_addrinfo->ai_addr))->sin_port;
+
+	freeaddrinfo(s_addrinfo);
+
+	return 0;
+}
+
diff --git a/common.h b/common.h
index 5f7b1f8..b7015da 100644
--- a/common.h
+++ b/common.h
@@ -2,6 +2,8 @@ struct dvb_host {
 	char *hostname;
 	char *port;
 	char *location;
+	int socktype;
 };
 
 struct dvb_host *parse(char *urlpart, char *defport);
+int resolve(struct dvb_host *dvbhost, struct sockaddr_in *server);
diff --git a/http.c b/http.c
index 65c1238..ca756bd 100644
--- a/http.c
+++ b/http.c
@@ -6,7 +6,6 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <netdb.h>
 
 #include "common.h"
 #include "http.h"
@@ -28,22 +27,19 @@ int open_http(char *url)
 {
 	int fd;
 	struct sockaddr_in server;
-	struct dvb_host *dvbhost;
-	struct addrinfo *s_addrinfo, addrhints;
+	static struct dvb_host *dvbhost = NULL;
 	char buffer[BUFFSIZE];
 	int i;
 
 	if(!is_http(url))
 		return -1;
 
-	dvbhost = parse(&(url[7]), "80");
-
-	bzero(&addrhints, sizeof(struct addrinfo));
-	addrhints.ai_family = PF_INET;
-	addrhints.ai_socktype = SOCK_STREAM;
+	if (!dvbhost) {
+		dvbhost = parse(&(url[7]), "80");
+		dvbhost->socktype = SOCK_STREAM;
+	}
 
-	if ((i = getaddrinfo(dvbhost->hostname, dvbhost->port, &addrhints, &s_addrinfo))) {
-		fprintf(stderr,"getaddrinfo: %s\n",gai_strerror(i));
+	if (resolve(dvbhost, &server) < 0) {
 		return -1;
 	}
 
@@ -52,19 +48,11 @@ int open_http(char *url)
 		return -1;
 	}
 
-	bzero(&server, sizeof(struct sockaddr_in));
-	server.sin_family = AF_INET;
-	server.sin_addr.s_addr = ((struct sockaddr_in*)(s_addrinfo->ai_addr))->sin_addr.s_addr;
-	server.sin_port = ((struct sockaddr_in*)(s_addrinfo->ai_addr))->sin_port;
-
 	if (connect(fd, (struct sockaddr*) &server, sizeof(server)) < 0) {
 		perror("connect");
 		return -1;
 	}
 
-	freeaddrinfo(s_addrinfo);
-
-
 	snprintf(buffer, BUFFSIZE-1, "GET /%s HTTP/1.0\n\n",dvbhost->location);
 	buffer[BUFFSIZE-1] = 0;
 	send(fd, buffer, strlen(buffer), 0);
diff --git a/mcast.c b/mcast.c
index e328932..5f7dadc 100644
--- a/mcast.c
+++ b/mcast.c
@@ -2,6 +2,9 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
 
 #include "common.h"
 #include "mcast.h"
@@ -19,16 +22,41 @@ int is_mcast(char *url)
 
 int open_mcast(char *url)
 {
-	struct dvb_host *dvbhost;
+	static struct dvb_host *dvbhost = NULL;
+	struct sockaddr_in server;
+	struct ip_mreq mreq;
 	int fd;
 
 	if(!is_mcast(url))
 		return -1;
 
-	dvbhost = parse(&(url[6]), "2000");
+	if (!dvbhost) {
+		dvbhost = parse(&(url[6]), "2000");
+		dvbhost->socktype = SOCK_DGRAM;
+	}
 
-	fprintf(stderr,"multicast currently unimplemented!\n");
-	return -1;
+	if (resolve(dvbhost, &server) < 0) {
+		return -1;
+	}
+
+	bzero(&mreq, sizeof(mreq));
+	mreq.imr_multiaddr = server.sin_addr;
+	mreq.imr_interface.s_addr = htonl(INADDR_ANY);
+
+	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+		perror("socket");
+		return -1;
+	}
+
+	if (bind(fd, (struct sockaddr*)&server, sizeof(server)) < 0) {
+		perror("bind");
+		return -1;
+	}
+
+	if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
+		perror("setsockopt");
+		return -1;
+	}
 
 	return fd;
 }
diff --git a/record-dvb.c b/record-dvb.c
index d32eba1..b27ce74 100644
--- a/record-dvb.c
+++ b/record-dvb.c
@@ -40,7 +40,8 @@ void record(int(*open_fn)(char *), char *url, char *outfile, int duration)
 	do {
 		if ((bytes = recv(in, buffer, CHUNKSIZE, 0)) < 1) {
 			/* TODO: Insert better connection-loss recovery here */
-			in = (*open_fn)(url);
+			if ((in = (*open_fn)(url)) < 0)
+				sleep(1);
 		}
 		written = 0;
 		do {