add: version.h

fix: refactor

src/helpers/open_discovery_socket.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <netdb.h>
+#include <sys/socket.h>
+
+#include <logger.h>
+#include <helpers.h>
+
+int
+helper_open_discovery_socket(uint16_t discovery_port)
+{
+    struct addrinfo hints, *res;
+    int fd, status;
+
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_INET; // use ipv4
+    hints.ai_socktype = SOCK_DGRAM; //set socket flag
+    hints.ai_flags = AI_PASSIVE; // get my IP
+
+    char discovery_port_str[6];
+    sprintf(discovery_port_str, "%u", discovery_port);
+
+    //get connection info for our computer
+    if ((status = getaddrinfo(NULL, discovery_port_str, &hints, &res)) != 0)
+    {
+        LOG_FATAL("getaddrinfo: %s\n", gai_strerror(status));
+        freeaddrinfo(res);
+        exit(EXIT_FAILURE);
+    }
+
+    //creating socket
+    fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+    int yes = 1;
+
+    // lose the pesky "Address already in use" error message
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
+    {
+        LOG_FATAL("setsockopt: %s\n", strerror(errno));
+        freeaddrinfo(res);
+        exit(EXIT_FAILURE);
+    }
+
+    if (bind(fd, res->ai_addr, res->ai_addrlen) == -1)
+    {
+        LOG_FATAL("bind: %s\n", strerror(errno));
+        freeaddrinfo(res);
+        exit(EXIT_FAILURE);
+    }
+
+    freeaddrinfo(res);
+
+    LOG_INFO("opened discovery socket on port %u\n", discovery_port);
+
+    return fd;
+}