Added new API calls

- ndpi_load_domain_suffixes()
- ndpi_get_host_domain_suffix()

whose goal is to find the domain name of a hostname. Example:

www.bbc.co.uk   -> co.uk
mail.apple.com  -> com

1 files changed, 93 insertions, 0 deletions

diff --git a/src/lib/ndpi_domains.c b/src/lib/ndpi_domains.c
new file mode 100644
index 000000000..12f735b36
--- /dev/null
+++ b/src/lib/ndpi_domains.c
@@ -0,0 +1,93 @@
+/*
+ * ndpi_domains.c
+ *
+ * Copyright (C) 2011-24 - ntop.org and contributors
+ *
+ * nDPI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * nDPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ndpi_config.h"
+#include "ndpi_api.h"
+#include "ndpi_includes.h"
+#include "ndpi_private.h"
+
+/* ******************************* */
+
+int ndpi_load_domain_suffixes(struct ndpi_detection_module_struct *ndpi_str,
+			      char *public_suffix_list_path) {
+  char buf[256], *line;
+  FILE *fd;
+  bool do_trace = false;
+  u_int num_domains = 0;
+  
+  if(public_suffix_list_path == NULL)
+    return(-1);
+
+  if((fd = fopen(public_suffix_list_path, "r")) == NULL)
+    return(-2);
+  
+  if(ndpi_str->public_domain_suffixes != NULL) {
+    /* An existing license was aleady loaded: free it and start over */
+    ndpi_domain_classify_free(ndpi_str->public_domain_suffixes);
+  }
+
+  if((ndpi_str->public_domain_suffixes = ndpi_domain_classify_alloc()) == NULL)
+    return(-3);
+
+  while((line = fgets(buf, sizeof(buf), fd)) != NULL) {
+    u_int offset, len;
+    
+    /* Skip empty lines or comments */
+    if((line[0] == '\0') || (line[0] == '/') || (line[0] == '\n') || (line[0] == '\r'))
+      continue;
+
+    if((line[0] == '*') && (line[1] == '.') && (line[2] != '\0'))
+      offset = 2;
+    else
+      offset = 0;
+
+    len = strlen(line) - 1;
+    while((len > 0) && (line[len] == '\n'))
+      line[len--] = '\0';
+
+    if(!ndpi_domain_classify_add(ndpi_str->public_domain_suffixes,
+				 1 /* dummy */, &line[offset])) {
+      if(do_trace) printf("Error while processing domain %s\n", &line[offset]);
+    } else
+      num_domains++;
+  }
+
+  if(!ndpi_domain_classify_finalize(ndpi_str->public_domain_suffixes)) {
+    if(do_trace) printf("Error while finalizing domain processing\n");
+  }
+
+  if(do_trace) printf("Loaded %u domains\n", num_domains);
+  
+  return(0);
+}
+
+/* ******************************* */
+
+const char* ndpi_get_host_domain_suffix(struct ndpi_detection_module_struct *ndpi_str,
+					const char *hostname) {
+  if(ndpi_str->public_domain_suffixes == NULL)
+    return(hostname);
+  else {
+    u_int8_t class_id;
+    
+    return(ndpi_domain_classify_longest_prefix(ndpi_str->public_domain_suffixes,
+					       &class_id, hostname));
+  }
+}