All things related to multicast

hi,

reminded of another local patch we had to the minisapserver

we noted when looking at SAP through the Cisco kit (when
we had the SAP viewer enabled....we dont anymore! ;-) )
that the software threw out a bogus source IP address
of 1.2.3.4 - why?  - who knows! anyway, heres a unified
diff patch to fix that and use the IP address of the system
on the interface being used:

--- minisapserver-0.3.4-orig/sapserver.cpp      2008-02-05 12:25:47.000000000 
+0000
+++ minisapserver-0.3.4-jpk/sapserver.cpp       2008-02-05 15:30:29.000000000 
+0000
@@ -42,7 +42,11 @@
 #ifdef HAVE_GETOPT_H
 # include <getopt.h>
 #endif
-
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
 using namespace std;

 #include "sapserver.h"
@@ -221,8 +225,20 @@
                 return 1;
             }

+            /* Work out the address of the interface in use */
+           int sockfd = socket(PF_INET,SOCK_DGRAM,0);
+           struct sockaddr_in *sin;
+           struct ifreq ifr;
+           strncpy(ifr.ifr_name,config.GetInterface (), IFNAMSIZ);
+           ioctl(sockfd,SIOCGIFADDR,&ifr);
+           close(sockfd);
+           sin = (struct sockaddr_in *) ((struct sockaddr *)
+                                         &(ifr.ifr_addr));
+           char * src_addr = inet_ntoa(sin->sin_addr);
+           printf("+ src IP address = %s\n",src_addr);
+
             /* Create a new message */
-            Message *message = new Message(0x4212+i, "1.2.3.4");
+            Message *message = new Message(0x4212+i, src_addr);
             /* Add the program */
             message->AddProgram(config.Programs[i]);





alan