From 1cb1ebbfe030b0fe7c2d369140a5ae5581af4ce3 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Wed, 30 May 2007 07:18:00 +0000
Subject: [PATCH]  r13090@catbus:  nickm | 2007-05-30 03:17:57 -0400  If the
 user makes a torrc that exceeds the bandwidth cap by one byte, let them have
 it.

svn:r10411
---
 ChangeLog       |  2 ++
 src/or/config.c | 21 +++++++++++++--------
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index db3a77a222..75e36c4728 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -119,6 +119,8 @@ Changes in version 0.2.0.1-alpha - 2007-??-??
       patterns can be reconfigured with AutomapHostsSuffixes.
     - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
       now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
+    - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb, minus 1
+      byte: the actual maximum declared bandwidth.
 
   o Removed features:
     - Removed support for the old binary "version 0" controller protocol.
diff --git a/src/or/config.c b/src/or/config.c
index 961d6887ef..165b2e5340 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -2322,13 +2322,18 @@ validate_ports_csv(smartlist_t *sl, const char *name, char **msg)
  * Else return 0.
  */
 static int
-ensure_bandwidth_cap(uint64_t value, const char *desc, char **msg)
+ensure_bandwidth_cap(uint64_t *value, const char *desc, char **msg)
 {
   int r;
   char buf[1024];
-  if (value > ROUTER_MAX_DECLARED_BANDWIDTH) {
+  if (*value == ROUTER_MAX_DECLARED_BANDWIDTH) {
+    /* This handles an understandable special case where somebody says "2gb"
+     * whereas our actual maximum is 2gb-1 (INT_MAX) */
+    --*value;
+  }
+  if (*value > ROUTER_MAX_DECLARED_BANDWIDTH) {
     r = tor_snprintf(buf, sizeof(buf), "%s ("U64_FORMAT") must be at most %d",
-                     desc, U64_PRINTF_ARG(value),
+                     desc, U64_PRINTF_ARG(*value),
                      ROUTER_MAX_DECLARED_BANDWIDTH);
     *msg = tor_strdup(r >= 0 ? buf : "internal error");
     return -1;
@@ -2761,19 +2766,19 @@ options_validate(or_options_t *old_options, or_options_t *options,
   if (options->KeepalivePeriod < 1)
     REJECT("KeepalivePeriod option must be positive.");
 
-  if (ensure_bandwidth_cap(options->BandwidthRate,
+  if (ensure_bandwidth_cap(&options->BandwidthRate,
                            "BandwidthRate", msg) < 0)
     return -1;
-  if (ensure_bandwidth_cap(options->BandwidthBurst,
+  if (ensure_bandwidth_cap(&options->BandwidthBurst,
                            "BandwidthBurst", msg) < 0)
     return -1;
-  if (ensure_bandwidth_cap(options->MaxAdvertisedBandwidth,
+  if (ensure_bandwidth_cap(&options->MaxAdvertisedBandwidth,
                            "MaxAdvertisedBandwidth", msg) < 0)
     return -1;
-  if (ensure_bandwidth_cap(options->RelayBandwidthRate,
+  if (ensure_bandwidth_cap(&options->RelayBandwidthRate,
                            "RelayBandwidthRate", msg) < 0)
     return -1;
-  if (ensure_bandwidth_cap(options->RelayBandwidthBurst,
+  if (ensure_bandwidth_cap(&options->RelayBandwidthBurst,
                            "RelayBandwidthBurst", msg) < 0)
     return -1;