fixed looking up interface

slsSupportLib/include/UdpRxSocket.h

@@ -53,6 +53,8 @@ class UdpRxSocket {
         hints.ai_protocol = 0;
         hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
         struct addrinfo *res = 0;
+
+        std::cout << "HOSTNAME: " << hostname << '\n';
         if (getaddrinfo(hostname, portname.c_str(), &hints, &res)) {
             throw RuntimeError("Failed getaddinfo");
         }
@@ -106,15 +108,28 @@ class UdpRxSocket {
 
     // Not sure we keep this
     bool ReceivePacket(char *dst) {
+        
         ssize_t count = recvfrom(fd, buff, packet_size, 0, nullptr, nullptr);
         return count == packet_size;
     }
 
     // Only for backwards compatibility will be removed
     ssize_t ReceiveDataOnly(char *dst) {
-        return recvfrom(fd, dst, packet_size, 0, nullptr, nullptr);
+        // TODO! Clean up?
+        // which detector do have a header packet?
+        // logic should probably be in another place? 
+        ssize_t r = 0;
+        r = recvfrom(fd, dst, packet_size, 0, nullptr, nullptr);
+
+        // if we read an eiger header pkg read again
+        if (r==40){
+            r = recvfrom(fd, dst, packet_size, 0, nullptr, nullptr);
+        }
+        return r;
     }
 
+
+
     ssize_t getBufferSize() const {
         uint64_t ret_size = 0;
         socklen_t optlen = sizeof(uint64_t);

slsSupportLib/src/network_utils.cpp

@@ -125,8 +125,7 @@ IpAddr InterfaceNameToIp(const std::string &ifn) {
     char host[NI_MAXHOST];
 
     if (getifaddrs(&ifaddr) == -1) {
-        perror("getifaddrs");
-        exit(EXIT_FAILURE);
+        return {};
     }
 
     for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
@@ -138,6 +137,10 @@ IpAddr InterfaceNameToIp(const std::string &ifn) {
 
         if ((strcmp(ifa->ifa_name, ifn.c_str()) == 0) &&
             (ifa->ifa_addr->sa_family == AF_INET)) {
+            if (s != 0) {
+                return {};
+            }
+            break;
         }
     }