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New FallbackDir option to add extra directories for bootstraping

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This replaces the old FallbackConsensus notion, and should provide a
way -- assuming we pick reasonable nodes! -- to give clients
suggestions of placs to go to get their first consensus.
This commit is contained in:
Nick Mathewson 2012-09-10 18:13:28 -04:00
parent 46a62e3256
commit 90f6071d8d
7 changed files with 155 additions and 20 deletions
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9
changes/fallback_dirsource Normal file
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@ -0,0 +1,9 @@
o Major features:
- Add a new FallbackDir option to use when we can't use a directory
from the consensus (either because we lack a consensus, or because
they're all down). Currently, all authorities are fallbacks by
default, and there are no other default fallbacks, but that will
change. This option will allow us to give clients a longer list
of servers to try to get a consensus from when first connecting
to the Tor network, and thereby reduce load on the directory
authorities.

5
doc/tor.1.txt
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@ -292,6 +292,11 @@ GENERAL OPTIONS
**DataDirectory** __DIR__::
Store working data in DIR (Default: @LOCALSTATEDIR@/lib/tor)
**FallbackDir** __address__:__port__ orport=__port__ id=__fingerprint__::
When we're unable to connect to any directory cache for directory info
(usually because we don't know about any yet) we try a FallbackDir.
By default, the directory authorities are also FallbackDirs.
**DirAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__::
Use a nonstandard authoritative directory server at the provided address
and port, with the specified key fingerprint. This option can be repeated

136
src/or/config.c
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@ -228,6 +228,7 @@ static config_var_t option_vars_[] = {
V(ExitPortStatistics, BOOL, "0"),
V(ExtendAllowPrivateAddresses, BOOL, "0"),
V(ExtraInfoStatistics, BOOL, "1"),
V(FallbackDir, LINELIST, NULL),
#if defined (WINCE)
V(FallbackNetworkstatusFile, FILENAME, "fallback-consensus"),
@ -474,6 +475,8 @@ static char *get_bindaddr_from_transport_listen_line(const char *line,
static int parse_dir_authority_line(const char *line,
dirinfo_type_t required_type,
int validate_only);
static int parse_dir_fallback_line(const char *line,
int validate_only);
static void port_cfg_free(port_cfg_t *port);
static int parse_ports(or_options_t *options, int validate_only,
char **msg_out, int *n_ports_out);
@ -756,7 +759,7 @@ static void
add_default_trusted_dir_authorities(dirinfo_type_t type)
{
int i;
const char *dirservers[] = {
const char *authorities[] = {
"moria1 orport=9101 no-v2 "
"v3ident=D586D18309DED4CD6D57C18FDB97EFA96D330566 "
"128.31.0.39:9131 9695 DFC3 5FFE B861 329B 9F1A B04C 4639 7020 CE31",
@ -785,10 +788,27 @@ add_default_trusted_dir_authorities(dirinfo_type_t type)
"154.35.32.5:80 CF6D 0AAF B385 BE71 B8E1 11FC 5CFF 4B47 9237 33BC",
NULL
};
for (i=0; dirservers[i]; i++) {
if (parse_dir_authority_line(dirservers[i], type, 0)<0) {
log_err(LD_BUG, "Couldn't parse internal dirserver line %s",
dirservers[i]);
for (i=0; authorities[i]; i++) {
if (parse_dir_authority_line(authorities[i], type, 0)<0) {
log_err(LD_BUG, "Couldn't parse internal DirAuthority line %s",
authorities[i]);
}
}
}
/** Add the default fallback directory servers into the fallback directory
* server list. */
static void
add_default_fallback_dir_servers(void)
{
int i;
const char *fallback[] = {
NULL
};
for (i=0; fallback[i]; i++) {
if (parse_dir_fallback_line(fallback[i], 0)<0) {
log_err(LD_BUG, "Couldn't parse internal FallbackDir line %s",
fallback[i]);
}
}
}
@ -798,7 +818,7 @@ add_default_trusted_dir_authorities(dirinfo_type_t type)
* user if we changed any dangerous ones.
*/
static int
validate_dir_authorities(or_options_t *options, or_options_t *old_options)
validate_dir_servers(or_options_t *options, or_options_t *old_options)
{
config_line_t *cl;
@ -842,6 +862,9 @@ validate_dir_authorities(or_options_t *options, or_options_t *old_options)
for (cl = options->AlternateHSAuthority; cl; cl = cl->next)
if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
return -1;
for (cl = options->FallbackDir; cl; cl = cl->next)
if (parse_dir_fallback_line(cl->value, 1)<0)
return -1;
return 0;
}
@ -849,14 +872,15 @@ validate_dir_authorities(or_options_t *options, or_options_t *old_options)
* as appropriate.
*/
static int
consider_adding_dir_authorities(const or_options_t *options,
const or_options_t *old_options)
consider_adding_dir_servers(const or_options_t *options,
const or_options_t *old_options)
{
config_line_t *cl;
int need_to_update =
!smartlist_len(router_get_trusted_dir_servers()) ||
!smartlist_len(router_get_fallback_dir_servers()) || !old_options ||
!config_lines_eq(options->DirAuthorities, old_options->DirAuthorities) ||
!config_lines_eq(options->FallbackDir, old_options->FallbackDir) ||
!config_lines_eq(options->AlternateBridgeAuthority,
old_options->AlternateBridgeAuthority) ||
!config_lines_eq(options->AlternateDirAuthority,
@ -882,6 +906,8 @@ consider_adding_dir_authorities(const or_options_t *options,
type |= HIDSERV_DIRINFO;
add_default_trusted_dir_authorities(type);
}
if (!options->FallbackDir)
add_default_fallback_dir_servers();
for (cl = options->DirAuthorities; cl; cl = cl->next)
if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
@ -895,6 +921,9 @@ consider_adding_dir_authorities(const or_options_t *options,
for (cl = options->AlternateHSAuthority; cl; cl = cl->next)
if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
return -1;
for (cl = options->FallbackDir; cl; cl = cl->next)
if (parse_dir_fallback_line(cl->value, 0)<0)
return -1;
return 0;
}
@ -1217,7 +1246,7 @@ options_act(const or_options_t *old_options)
return -1;
}
if (consider_adding_dir_authorities(options, old_options) < 0)
if (consider_adding_dir_servers(options, old_options) < 0)
return -1;
#ifdef NON_ANONYMOUS_MODE_ENABLED
@ -2844,8 +2873,9 @@ options_validate(or_options_t *old_options, or_options_t *options,
if (validate_addr_policies(options, msg) < 0)
return -1;
if (validate_dir_authorities(options, old_options) < 0)
REJECT("Directory authority line did not parse. See logs for details.");
if (validate_dir_servers(options, old_options) < 0)
REJECT("Directory authority/fallback line did not parse. See logs "
"for details.");
if (options->UseBridges && !options->Bridges)
REJECT("If you set UseBridges, you must specify at least one bridge.");
@ -4439,7 +4469,7 @@ parse_dir_authority_line(const char *line, dirinfo_type_t required_type,
log_debug(LD_DIR, "Trusted %d dirserver at %s:%d (%s)", (int)type,
address, (int)dir_port, (char*)smartlist_get(items,0));
if (!(ds = trusted_dir_server_new(nickname, address, dir_port, or_port,
digest, v3_digest, type)))
digest, v3_digest, type, 1.0)))
goto err;
dir_server_add(ds);
}
@ -4460,6 +4490,88 @@ parse_dir_authority_line(const char *line, dirinfo_type_t required_type,
return r;
}
/** Read the contents of a FallbackDir line from <b>line</b>. If
* <b>validate_only</b> is 0, and the line is well-formed, then add the
* dirserver described in the line as a fallback directory. Return 0 on
* success, or -1 if the line isn't well-formed or if we can't add it. */
static int
parse_dir_fallback_line(const char *line,
int validate_only)
{
int r = -1;
smartlist_t *items = smartlist_new(), *positional = smartlist_new();
int orport = -1;
uint16_t dirport;
tor_addr_t addr;
int ok;
char id[DIGEST_LEN];
char *address=NULL;
memset(id, 0, sizeof(id));
smartlist_split_string(items, line, NULL,
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
SMARTLIST_FOREACH_BEGIN(items, const char *, cp) {
const char *eq = strchr(cp, '=');
ok = 1;
if (! eq) {
smartlist_add(positional, (char*)cp);
continue;
}
if (!strcmpstart(cp, "orport="))
orport = (int)tor_parse_long(cp+strlen("orport="), 10,
1, 65535, &ok, NULL);
else if (!strcmpstart(cp, "id="))
ok = !base16_decode(id, DIGEST_LEN,
cp+strlen("id="), strlen(cp)-strlen("id="));
if (!ok) {
log_warn(LD_CONFIG, "Bad FallbackDir option %s", escaped(cp));
goto end;
}
} SMARTLIST_FOREACH_END(cp);
if (smartlist_len(positional) != 1) {
log_warn(LD_CONFIG, "Couldn't parse FallbackDir line %s", escaped(line));
goto end;
}
if (tor_digest_is_zero(id)) {
log_warn(LD_CONFIG, "Missing identity on FallbackDir line");
goto end;
}
if (orport <= 0) {
log_warn(LD_CONFIG, "Missing orport on FallbackDir line");
goto end;
}
if (tor_addr_port_split(LOG_INFO, smartlist_get(positional, 0),
&address, &dirport) < 0 ||
tor_addr_parse(&addr, address)<0) {
log_warn(LD_CONFIG, "Couldn't parse address:port %s on FallbackDir line",
(const char*)smartlist_get(positional, 0));
goto end;
}
if (!validate_only) {
dir_server_t *ds;
ds = fallback_dir_server_new(&addr, dirport, orport, id, 1.0);
if (!ds) {
log_warn(LD_CONFIG, "Couldn't create FallbackDir %s", escaped(line));
goto end;
}
dir_server_add(ds);
}
r = 0;
end:
SMARTLIST_FOREACH(items, char *, cp, tor_free(cp));
smartlist_free(items);
smartlist_free(positional);
tor_free(address);
return r;
}
/** Free all storage held in <b>port</b> */
static void
port_cfg_free(port_cfg_t *port)

4
src/or/or.h
View File

@ -3428,6 +3428,9 @@ typedef struct {
* use the "Alternate*Authority" options below instead. */
config_line_t *DirAuthorities;
/** List of fallback directory servers */
config_line_t *FallbackDir;
/** If set, use these main (currently v3) directory authorities and
* not the default ones. */
config_line_t *AlternateDirAuthority;
@ -4496,6 +4499,7 @@ typedef struct dir_server_t {
uint32_t addr; /**< IPv4 address. */
uint16_t dir_port; /**< Directory port. */
uint16_t or_port; /**< OR port: Used for tunneling connections. */
double weight; /** Weight used when selecting this node at random */
char digest[DIGEST_LEN]; /**< Digest of identity key. */
char v3_identity_digest[DIGEST_LEN]; /**< Digest of v3 (authority only,
* high-security) identity key. */

2
src/or/router.c
View File

@ -737,7 +737,7 @@ init_keys(void)
router_get_advertised_or_port(options),
digest,
v3_digest,
type);
type, 0.0);
if (!ds) {
log_err(LD_GENERAL,"We want to be a directory authority, but we "
"couldn't add ourselves to the authority list. Failing.");

15
src/or/routerlist.c
View File

@ -3785,12 +3785,16 @@ dir_server_new(int is_authority,
const char *hostname,
uint16_t dir_port, uint16_t or_port,
const char *digest, const char *v3_auth_digest,
dirinfo_type_t type)
dirinfo_type_t type,
double weight)
{
dir_server_t *ent;
uint32_t a;
char *hostname_ = NULL;
if (weight < 0)
return NULL;
if (tor_addr_family(addr) == AF_INET)
a = tor_addr_to_ipv4h(addr);
else
@ -3810,6 +3814,7 @@ dir_server_new(int is_authority,
ent->is_running = 1;
ent->is_authority = is_authority;
ent->type = type;
ent->weight = weight;
memcpy(ent->digest, digest, DIGEST_LEN);
if (v3_auth_digest && (type & V3_DIRINFO))
memcpy(ent->v3_identity_digest, v3_auth_digest, DIGEST_LEN);
@ -3842,7 +3847,7 @@ dir_server_t *
trusted_dir_server_new(const char *nickname, const char *address,
uint16_t dir_port, uint16_t or_port,
const char *digest, const char *v3_auth_digest,
dirinfo_type_t type)
dirinfo_type_t type, double weight)
{
uint32_t a;
tor_addr_t addr;
@ -3869,7 +3874,7 @@ trusted_dir_server_new(const char *nickname, const char *address,
result = dir_server_new(1, nickname, &addr, hostname,
dir_port, or_port, digest,
v3_auth_digest, type);
v3_auth_digest, type, weight);
tor_free(hostname);
return result;
}
@ -3880,10 +3885,10 @@ trusted_dir_server_new(const char *nickname, const char *address,
dir_server_t *
fallback_dir_server_new(const tor_addr_t *addr,
uint16_t dir_port, uint16_t or_port,
const char *id_digest)
const char *id_digest, double weight)
{
return dir_server_new(0, NULL, addr, NULL, dir_port, or_port, id_digest,
NULL, ALL_DIRINFO);
NULL, ALL_DIRINFO, weight);
}
/** Add a directory server to the global list(s). */

4
src/or/routerlist.h
View File

@ -136,10 +136,10 @@ int router_exit_policy_rejects_all(const routerinfo_t *router);
dir_server_t *trusted_dir_server_new(const char *nickname, const char *address,
uint16_t dir_port, uint16_t or_port,
const char *digest, const char *v3_auth_digest,
dirinfo_type_t type);
dirinfo_type_t type, double weight);
dir_server_t *fallback_dir_server_new(const tor_addr_t *addr,
uint16_t dir_port, uint16_t or_port,
const char *id_digest);
const char *id_digest, double weight);
void dir_server_add(dir_server_t *ent);
void authority_cert_free(authority_cert_t *cert);