client.c: Created print_update_link() to get and print the update link

print_update_link() calls the server to get the link needed by the collect
agent to update, printing the link to the standard output.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>

src/client.c

@@ -35,6 +35,7 @@
  *          7) Server returned an empty version string
  *          8) Server returned an invalid version string
  *          9) Server did not find the version file
+ *         10) Server returned an empty update link
  */
 int main(int argc, char **argv)
 {
@@ -183,6 +184,41 @@ static char *read_version_file(char *basedir)
     return version;
 }
 
+/*----------------------------------------------------------------------------
+ * Summary: Contact webservice server to receive the update link.
+ * Parameters:
+ *      soap            SOAP struct
+ *      url             URL of the contacted webservice server
+ * Return: void
+ */
+void print_update_link(struct soap *soap, char *url)
+{
+    char *updateLink;
+
+    if (soap_call_ns1__getUpdateLink(soap, url, "", &updateLink) != SOAP_OK)
+    {
+        soap_print_fault(soap, stderr);
+        exit(2);
+    }
+
+    /* Get update link from response */
+    if (DEBUG)
+    {
+        printf("UpdateLink: %s\n", updateLink);
+    }
+
+    /* Verify received update link and print appropriate messages */
+    if (updateLink == NULL)
+    {
+        fprintf(stderr, "Get update link error (server returned NULL).\n");
+        /* Server returned an empty update link */
+        exit(10);
+    }
+
+    /* Print to stdout the update link string */
+    fprintf(stdout, "%s\n", updateLink);
+}
+
 /*----------------------------------------------------------------------------
  * Summary: Contact webservice server to verify client version.
  * Parameters: