Move gethostname_str to utils

src/util/addr_util.cpp

@@ -245,3 +245,13 @@ int create_and_bind_socket(std::string bind_address, int bind_port, int listen_b
 
     return listen_fd;
 }
+
+std::string gethostname_str()
+{
+    std::string hostname;
+    hostname.resize(1024);
+    while (gethostname((char*)hostname.data(), hostname.size()) < 0 && errno == ENAMETOOLONG)
+        hostname.resize(hostname.size()+1024);
+    hostname.resize(strnlen(hostname.data(), hostname.size()));
+    return hostname;
+}

src/util/addr_util.h

@@ -21,3 +21,4 @@ bool cidr6_match(const in6_addr &address, const in6_addr &network, uint8_t bits)
 bool cidr_sockaddr_match(const sockaddr_storage &addr, const addr_mask_t &mask);
 std::vector<std::string> getifaddr_list(const std::vector<addr_mask_t> & masks = std::vector<addr_mask_t>(), bool include_v6 = false);
 int create_and_bind_socket(std::string bind_address, int bind_port, int listen_backlog, int *listening_port);
+std::string gethostname_str();