From a13b233b0ac23495df52fa80dddd02f24ce71491 Mon Sep 17 00:00:00 2001
From: Fredrik Tolf <fredrik@dolda2000.com>
Date: Sat, 9 Aug 2008 20:45:15 +0200
Subject: [PATCH] Added daemonization and syslogging.

---
 src/mctap.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/mctap.c b/src/mctap.c
index 2bec00f..842a9d6 100644
--- a/src/mctap.c
+++ b/src/mctap.c
@@ -11,12 +11,13 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/poll.h>
+#include <syslog.h>
 
 #include "utils.h"
 
 static void usage(FILE *out)
 {
-    fprintf(out, "usage: mctap [-h] [-D TAPNAME] MCASTGROUP PORT\n");
+    fprintf(out, "usage: mctap [-hd] [-D TAPNAME] MCASTGROUP PORT\n");
 }
 
 static __attribute__ ((unused)) char *formataddress(struct sockaddr *arg, socklen_t arglen)
@@ -126,7 +127,7 @@ static void bridge(int sock, int tap, struct sockaddr *dst, socklen_t dstlen)
 	ret = poll(pfds, 2, -1);
 	if(ret < 0) {
 	    if(errno != EINTR) {
-		fprintf(stderr, "mctap: poll: %s\n", strerror(errno));
+		syslog(LOG_ERR, "mctap: poll: %s", strerror(errno));
 		exit(1);
 	    }
 	    continue;
@@ -135,7 +136,7 @@ static void bridge(int sock, int tap, struct sockaddr *dst, socklen_t dstlen)
 	    ret = read(sock, buf, sizeof(buf));
 	    if(ret < 0) {
 		if((errno != EINTR) && (errno != EAGAIN)) {
-		    fprintf(stderr, "mctap: mcast packet: %s\n", strerror(errno));
+		    syslog(LOG_ERR, "mctap: mcast packet: %s", strerror(errno));
 		    exit(1);
 		}
 	    } else {
@@ -154,7 +155,7 @@ static void bridge(int sock, int tap, struct sockaddr *dst, socklen_t dstlen)
 	    ret = read(tap, buf, sizeof(buf));
 	    if(ret < 0) {
 		if((errno != EINTR) && (errno != EAGAIN)) {
-		    fprintf(stderr, "mctap: mcast packet: %s\n", strerror(errno));
+		    syslog(LOG_ERR, "mctap: mcast packet: %s", strerror(errno));
 		    exit(1);
 		}
 	    } else {
@@ -195,14 +196,19 @@ int main(int argc, char **argv)
     struct in_addr group;
     int port;
     char *tapname;
+    int daemonize;
     struct sockaddr_in dst;
     
     tapname = "mctap";
-    while((c = getopt(argc, argv, "hD:")) >= 0) {
+    daemonize = 0;
+    while((c = getopt(argc, argv, "hD:d")) >= 0) {
 	switch(c) {
 	case 'D':
 	    tapname = optarg;
 	    break;
+	case 'd':
+	    daemonize = 1;
+	    break;
 	case 'h':
 	    usage(stdout);
 	    return(0);
@@ -228,6 +234,10 @@ int main(int argc, char **argv)
 	fprintf(stderr, "mctap: could not create TAP device: %s\n", strerror(errno));
 	exit(1);
     }
+    openlog(sprintf2("mctap-%s", tapname), LOG_PID, LOG_DAEMON);
+    
+    if(daemonize)
+	daemon(0, 0);
     
     memset(&dst, 0, sizeof(dst));
     dst.sin_family = AF_INET;
-- 
2.11.0