initial fixing

slsSupportLib/include/UdpSocket.h

@@ -0,0 +1,56 @@
+
+#include <cstdint>
+#include <errno.h>
+#include <iostream>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "sls_detector_exceptions.h"
+
+namespace sls {
+
+class UdpSocket {
+    int port;
+    size_t packet_size;
+    size_t buffer_size;
+    int fd = -1;
+
+  public:
+    UdpSocket(int port, size_t packet_size)
+        : port(port), packet_size(packet_size) {
+        const char *hostname = 0; /* wildcard */
+        const std::string portname = std::to_string(port);
+        struct addrinfo hints;
+        memset(&hints, 0, sizeof(hints));
+        hints.ai_family = AF_UNSPEC;
+        hints.ai_socktype = SOCK_DGRAM;
+        hints.ai_protocol = 0;
+        hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
+        struct addrinfo *res = 0;
+        if (getaddrinfo(hostname, portname.c_str(), &hints, &res)){
+            throw RuntimeError("Failed getaddinfo");
+        }
+        fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+        if(fd==-1){
+            throw RuntimeError("Failed creating socket");
+        }
+        if (bind(fd, res->ai_addr, res->ai_addrlen) == -1) {
+            throw RuntimeError("Failed to bind socket");
+        }
+        freeaddrinfo(res);
+    }
+
+    int ReceivePacket() {
+        char buffer[549];
+        struct sockaddr_storage src_addr;
+        socklen_t src_addr_len = sizeof(src_addr);
+        ssize_t count = recvfrom(fd, buffer, sizeof(buffer), 0,
+                                 (struct sockaddr *)&src_addr, &src_addr_len);
+        return count;
+    }
+};
+
+} // namespace sls