1 files changed, 118 insertions, 0 deletions
diff --git a/src/lib/protocols/git.c b/src/lib/protocols/git.c
new file mode 100644
index 000000000..63479b26a
--- /dev/null
+++ b/src/lib/protocols/git.c
@@ -0,0 +1,118 @@
+/*
+ * git.c
+ *
+ * Copyright (C) 2012-16 - ntop.org
+ *
+ * This module 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.
+ *
+ * This module 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.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <stdlib.h>
+#include "ndpi_api.h"
+
+#ifdef NDPI_PROTOCOL_GIT
+
+#define GIT_PORT 9418
+
+/* read all the length even if there is a null byte inside */
+u_int16_t read_all_len(char * s, u_int16_t git_len)
+{
+  char * p = s;
+  int c = 0;
+  while(*p && c < git_len-4) {
+    c++;
+    p++;
+    if(!*p) {
+      if(c < git_len-4)	{
+	p++;
+	c++;
+      }
+    }
+  }
+  return c;
+}
+
+void ndpi_search_git(struct ndpi_detection_module_struct *ndpi_struct,
+		      struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct * packet = &flow->packet;
+  const u_int8_t * pp = packet->payload;
+  u_int16_t payload_len = packet->payload_packet_len;
+  
+  u_int8_t * git_pkt_len_buff = NULL;
+  u_int8_t * git_pkt_data = NULL;
+  u_int16_t git_len = 0, count = 0 , is_git = 0;
+
+  if(packet->tcp != NULL) {
+
+    if((ntohs(packet->tcp->source) == GIT_PORT ||
+	ntohs(packet->tcp->dest) == GIT_PORT)) {
+
+      git_pkt_len_buff = malloc(4 * sizeof(u_int8_t));
+
+      do {
+	 memcpy(git_pkt_len_buff, pp, 4);
+	 git_len = (int)strtol(git_pkt_len_buff, NULL, 16);
+	 
+	 if(git_pkt_len_buff[0] == 48 &&
+	    git_pkt_len_buff[1] == 48 &&
+	    git_pkt_len_buff[2] == 48 &&
+	    git_pkt_len_buff[3] == 48)
+	   /* Terminator packet */
+	   count += 4;
+	 else {
+	      git_pkt_data = malloc((git_len-4) * sizeof(u_int8_t));
+	      memcpy(git_pkt_data, pp+4, git_len-4);
+	      u_int16_t data_len = read_all_len(git_pkt_data, git_len);
+	      free(git_pkt_data);
+	      
+	      if(git_len != data_len+4)
+		    goto no_git;
+	      else {
+		    count += git_len;
+		    pp += git_len;
+	      }
+	 }
+      } while(count < payload_len);
+    }
+    else goto no_git;
+  }
+  else goto no_git;
+  
+  NDPI_LOG(NDPI_PROTOCOL_GIT, ndpi_struct, NDPI_LOG_DEBUG, "found Git.\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_GIT, NDPI_PROTOCOL_UNKNOWN);
+  return;
+
+ no_git:
+  NDPI_LOG(NDPI_PROTOCOL_GIT, ndpi_struct, NDPI_LOG_DEBUG, "exclude Git.\n");
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_GIT);
+}
+
+
+/* ***************************************************************** */
+
+
+void init_git_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+			 NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("Git", ndpi_struct, detection_bitmask, *id,
+				      NDPI_PROTOCOL_GIT,
+				      ndpi_search_git,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_TCP_WITH_PAYLOAD,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+
+#endif /* NDPI_PROTOCOL_GIT */