add tests

maxscale-system-test/get_my_ip.cpp

@@ -0,0 +1,59 @@
+/*
+ * Find local ip used as source ip in ip packets.
+ * Use getsockname and a udp connection
+ */
+
+#include<stdio.h> //printf
+#include<string.h>    //memset
+#include<errno.h> //errno
+#include<sys/socket.h>    //socket
+#include<netinet/in.h> //sockaddr_in
+#include<arpa/inet.h> //getsockname
+#include<unistd.h>    //close
+
+#include "get_my_ip.h"
+
+int get_my_ip(char * remote_ip, char * my_ip )
+{
+
+    int dns_port = 53;
+
+    struct sockaddr_in serv;
+
+    int sock = socket ( AF_INET, SOCK_DGRAM, 0);
+
+    //Socket could not be created
+    if (sock < 0)
+    {
+        return 1;
+    }
+
+    memset( &serv, 0, sizeof(serv) );
+    serv.sin_family = AF_INET;
+    serv.sin_addr.s_addr = inet_addr( remote_ip );
+    serv.sin_port = htons( dns_port );
+
+    int err = connect( sock , (const struct sockaddr*) &serv , sizeof(serv) );
+
+    struct sockaddr_in name;
+    socklen_t namelen = sizeof(name);
+    err = getsockname(sock, (struct sockaddr*) &name, &namelen);
+
+    char buffer[100];
+    const char* p = inet_ntop(AF_INET, &name.sin_addr, buffer, 100);
+
+    if (p != NULL)
+    {
+        //printf("Local ip is : %s \n" , buffer);
+        strcpy(my_ip, buffer);
+        close(sock);
+        return 0;
+    }
+    else
+    {
+        //Some error
+        printf ("Error number : %d . Error message : %s \n" , errno , strerror(errno));
+        close(sock);
+        return 2;
+    }
+}