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Add an option to weight down authorities when choosing a fallback

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This commit is contained in:
Nick Mathewson 2012-09-12 13:56:36 -04:00
parent 06cd62266f
commit a8d491a8fd
4 changed files with 18 additions and 2 deletions
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6
doc/tor.1.txt
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@ -322,6 +322,12 @@ GENERAL OPTIONS
distinguishable from other users, because you won't believe the same
authorities they do.
**DirAuthorityFallbackRate** __NUM__::
When configured to use both directory authorities and fallback
directories, the directory authorities also work as fallbacks. They are
chosen with their regular weights, multiplied by this number, which
should be 1.0 or less. (Default: 1.0)
**DynamicDHGroups** **0**|**1**::
If this option is set to 1, when running as a server, generate our
own Diffie-Hellman group instead of using the one from Apache's mod_ssl.

1
src/or/config.c
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@ -208,6 +208,7 @@ static config_var_t option_vars_[] = {
OBSOLETE("DirRecordUsageSaveInterval"),
V(DirReqStatistics, BOOL, "1"),
VAR("DirAuthority", LINELIST, DirAuthorities, NULL),
V(DirAuthorityFallbackRate, DOUBLE, "1.0"),
V(DisableAllSwap, BOOL, "0"),
V(DisableDebuggerAttachment, BOOL, "1"),
V(DisableIOCP, BOOL, "1"),

4
src/or/or.h
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@ -3431,6 +3431,10 @@ typedef struct {
/** List of fallback directory servers */
config_line_t *FallbackDir;
/** Weight to apply to all directory authority rates if considering them
* along with fallbackdirs */
double DirAuthorityFallbackRate;
/** If set, use these main (currently v3) directory authorities and
* not the default ones. */
config_line_t *AlternateDirAuthority;

9
src/or/routerlist.c
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@ -1252,7 +1252,7 @@ router_pick_directory_server_impl(dirinfo_type_t type, int flags)
/** Pick a random element from a list of dir_server_t, weighting by their
* <b>weight</b> field. */
static const dir_server_t *
dirserver_choose_by_weight(const smartlist_t *servers)
dirserver_choose_by_weight(const smartlist_t *servers, double authority_weight)
{
int n = smartlist_len(servers);
int i;
@ -1263,6 +1263,8 @@ dirserver_choose_by_weight(const smartlist_t *servers)
for (i = 0; i < n; ++i) {
ds = smartlist_get(servers, i);
weights[i].dbl = ds->weight;
if (ds->is_authority)
weights[i].dbl *= authority_weight;
}
scale_array_elements_to_u64(weights, n, NULL);
@ -1290,6 +1292,8 @@ router_pick_trusteddirserver_impl(const smartlist_t *sourcelist,
const int prefer_tunnel = (flags & PDS_PREFER_TUNNELED_DIR_CONNS_);
const int no_serverdesc_fetching =(flags & PDS_NO_EXISTING_SERVERDESC_FETCH);
const int no_microdesc_fetching =(flags & PDS_NO_EXISTING_MICRODESC_FETCH);
const double auth_weight = (sourcelist == fallback_dir_servers) ?
options->DirAuthorityFallbackRate : 1.0;
smartlist_t *pick_from;
int n_busy = 0;
int try_excluding = 1, n_excluded = 0;
@ -1368,7 +1372,8 @@ router_pick_trusteddirserver_impl(const smartlist_t *sourcelist,
}
{
const dir_server_t *selection = dirserver_choose_by_weight(pick_from);
const dir_server_t *selection =
dirserver_choose_by_weight(pick_from, auth_weight);
if (selection)
result = &selection->fake_status;