- client: (unix): if host name lookup fails, call res_init().

This is an attempt to fix a problem on Linux where,
    if the client starts before a VPN is set up, it can never communicate

svn path=/trunk/boinc/; revision=17711

checkin_notes

@@ -3486,3 +3486,13 @@ David  30 Mar 2009
 
     lib/
         gui_rpc_client_ops.cpp
+
+David  31 Mar 2009
+    - client: (unix): if host name lookup fails, call res_init().
+        This is an attempt to fix a problem on Linux where,
+        if the client starts before a VPN is set up, it can never communicate
+
+    client/
+        http_curl.cpp
+    lib/
+        network.cpp,h

client/http_curl.cpp

@@ -1038,6 +1038,7 @@ void HTTP_OP::handle_messages(CURLMsg *pcurlMsg) {
         strcpy(error_msg, curl_easy_strerror(CurlResult));
         switch(CurlResult) {
         case CURLE_COULDNT_RESOLVE_HOST:
+            reset_dns();
             http_op_retval = ERR_GETHOSTBYNAME;
             break;
         case CURLE_COULDNT_CONNECT:

lib/network.cpp

@@ -38,6 +38,7 @@
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif
+#include <resolv.h>
 #include <netdb.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -199,6 +200,11 @@ int WinsockCleanup() {
     return WSACleanup();
 }
 
-
 #endif
+
+void reset_dns() {
+#ifndef _WIN32
+    res_init();
+#endif
+}
 const char *BOINC_RCSID_557bf0741f="$Id$";

lib/network.h

@@ -46,6 +46,7 @@ extern int boinc_socket_asynch(int sock, bool asynch);
 extern void boinc_close_socket(int sock);
 extern int get_socket_error(int fd);
 extern const char* socket_error_str();
+extern void reset_dns();
 
 #if defined(_WIN32) && defined(USE_WINSOCK)
 typedef int boinc_socklen_t;