-moving friends file parsing logic into its own library

1 files changed, 165 insertions, 0 deletions

diff --git a/src/topology/friends.c b/src/topology/friends.c
new file mode 100644
index 000000000..c0915fa15
--- /dev/null
+++ b/src/topology/friends.c
@@ -0,0 +1,165 @@
+/*
+     This file is part of GNUnet.
+     (C) 2013 Christian Grothoff
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file topology/friends.c
+ * @brief library to read and write the FRIENDS file
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_friends_lib.h"
+
+
+/**
+ * Parse the FRIENDS file.
+ *
+ * @param cfg our configuration
+ * @param cb function to call on each friend found
+ * @param cb_cls closure for @a cb
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on parsing errors
+ */
+int
+GNUNET_FRIENDS_parse (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                      GNUNET_FRIENDS_Callback cb,
+                      void *cb_cls)
+{
+  char *fn;
+  char *data;
+  size_t pos;
+  size_t start;
+  struct GNUNET_PeerIdentity pid;
+  uint64_t fsize;
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                               "topology", "FRIENDS");
+    return GNUNET_SYSERR;
+  }
+  if ( (GNUNET_OK != GNUNET_DISK_file_test (fn)) &&
+       (GNUNET_OK != GNUNET_DISK_fn_write (fn, NULL, 0,
+                                           GNUNET_DISK_PERM_USER_READ |
+                                           GNUNET_DISK_PERM_USER_WRITE)) )
+      GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
+  if ( (GNUNET_OK !=
+        GNUNET_DISK_file_size (fn,
+                               &fsize,
+                               GNUNET_NO, GNUNET_YES)) ||
+       (0 == fsize) )
+  {
+    GNUNET_free (fn);
+    return GNUNET_OK;
+  }
+  data = GNUNET_malloc_large (fsize);
+  if (NULL == data)
+  {
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "malloc");
+    GNUNET_free (fn);
+    return GNUNET_SYSERR;
+  }
+  if (fsize != GNUNET_DISK_fn_read (fn, data, fsize))
+  {
+    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "read", "fn");
+    GNUNET_free (fn);
+    GNUNET_free (data);
+    return GNUNET_SYSERR;
+  }
+  start = 0;
+  pos = 0;
+  while (pos < fsize)
+  {
+    while ((pos < fsize) && isspace ((unsigned char) data[pos]))
+      pos++;
+    if (GNUNET_OK !=
+        GNUNET_CRYPTO_ecc_public_sign_key_from_string (&data[start],
+                                                       pos - start,
+                                                       &pid.public_key))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                  _("Syntax error in topology specification at offset %llu, skipping bytes `%.*s'.\n"),
+                  (unsigned long long) pos,
+                  (int) (pos - start),
+                  &data[start]);
+      pos++;
+      start = pos;
+      continue;
+    }
+    pos++;
+    start = pos;
+    cb (cb_cls, &pid);
+  }
+  GNUNET_free (data);
+  GNUNET_free (fn);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Handle for writing a friends file.
+ */
+struct GNUNET_FRIENDS_Writer
+{
+};
+
+
+/**
+ * Start writing a fresh FRIENDS file.  Will make a backup of the
+ * old one.
+ *
+ * @param cfg configuration to use.
+ * @return NULL on error
+ */
+struct GNUNET_FRIENDS_Writer *
+GNUNET_FRIENDS_write_start (const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  return NULL;
+}
+
+
+/**
+ * Finish writing out the friends file.
+ *
+ * @param w write handle
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+GNUNET_FRIENDS_write_stop (struct GNUNET_FRIENDS_Writer *w)
+{
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Add a friend to the friends file.
+ *
+ * @param w write handle
+ * @param friend friend to add
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+GNUNET_FRIENDS_write (struct GNUNET_FRIENDS_Writer *w,
+                      const struct GNUNET_PeerIdentity *friend)
+{
+  return GNUNET_SYSERR;
+}
+
+
+/* end of friends.c */