1 files changed, 77 insertions, 0 deletions
diff --git a/src/common/opcell.c b/src/common/opcell.c
new file mode 100644
index 0000000000..288a355ce8
--- /dev/null
+++ b/src/common/opcell.c
@@ -0,0 +1,77 @@
+/**
+ * opcell.c
+ * Onion Proxy Cell
+ *
+ * Matej Pfajfar <mp292@cam.ac.uk>
+ */
+
+/*
+ * Changes :
+ * $Log$
+ * Revision 1.1  2002/06/26 22:45:50  arma
+ * Initial revision
+ *
+ * Revision 1.1  2002/03/03 12:08:18  mp292
+ * Added a new type of cell - used for data going between the onion proxy and
+ * the first or hop. Payload size identical to that of a normal cell.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h>
+  
+#include <openssl/rand.h>
+
+#include "opcell.h"
+#include "log.h"
+
+opcell_t *new_padding_opcell()
+{
+  opcell_t *c = NULL;
+  int retval;
+  
+  c = malloc(sizeof(opcell_t));
+  if (!c) /* malloc() error */
+    return NULL;
+
+  retval = RAND_pseudo_bytes((unsigned char *)c,sizeof(opcell_t));
+  if (retval == -1) /* RAND_pseudo_bytes() error */
+  {
+    free((void *)c);
+    return NULL;
+  } /* RAND_pseudo_bytes() error */
+
+  c->command = OPCELL_PADDING;
+  
+  return c;
+}
+
+opcell_t *new_data_opcell(unsigned char length, unsigned char *buf)
+{
+  opcell_t *c = NULL;
+  int retval;
+
+  if ((length <= OPCELL_PAYLOAD_SIZE) && (buf)) /* valid parameters */
+  {
+    c = malloc(sizeof(opcell_t));
+    if (!c) /* malloc() error */
+      return NULL;
+    
+    c->command = OPCELL_DATA;
+    c->length = length;
+    
+    memcpy((void *)c->payload, (void *)buf, length);
+    retval = RAND_pseudo_bytes((unsigned char *)(c->payload+length),OPCELL_PAYLOAD_SIZE-length);
+    if (retval == -1) /* RAND_pseudo_bytes() error */
+    {
+      free((void *)c);
+      return NULL;
+    } /* RAND_pseudo_bytes() error */
+    
+    return c;
+  } /* valid parameters */
+  else /* invalid parameters */
+    return NULL;
+}
+