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tor/src/or/directory.c

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/* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2008, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#include "or.h"
#if defined(EXPORTMALLINFO) && defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO)
#ifndef OPENBSD
#include <malloc.h>
#endif
#endif
/**
* \file directory.c
* \brief Code to send and fetch directories and router
* descriptors via HTTP. Directories use dirserv.c to generate the
* results; clients use routers.c to parse them.
**/
/* In-points to directory.c:
*
* - directory_post_to_dirservers(), called from
* router_upload_dir_desc_to_dirservers() in router.c
* upload_service_descriptor() in rendservice.c
* - directory_get_from_dirserver(), called from
* rend_client_refetch_renddesc() in rendclient.c
* run_scheduled_events() in main.c
* do_hup() in main.c
* - connection_dir_process_inbuf(), called from
* connection_process_inbuf() in connection.c
* - connection_dir_finished_flushing(), called from
* connection_finished_flushing() in connection.c
* - connection_dir_finished_connecting(), called from
* connection_finished_connecting() in connection.c
*/
static void directory_send_command(dir_connection_t *conn,
int purpose, int direct, const char *resource,
const char *payload, size_t payload_len,
int supports_conditional_consensus,
time_t if_modified_since);
static int directory_handle_command(dir_connection_t *conn);
static int body_is_plausible(const char *body, size_t body_len, int purpose);
static int purpose_needs_anonymity(uint8_t dir_purpose,
uint8_t router_purpose);
static char *http_get_header(const char *headers, const char *which);
static void http_set_address_origin(const char *headers, connection_t *conn);
static void connection_dir_download_networkstatus_failed(
dir_connection_t *conn, int status_code);
static void connection_dir_download_routerdesc_failed(dir_connection_t *conn);
static void connection_dir_download_cert_failed(
dir_connection_t *conn, int status_code);
static void dir_networkstatus_download_failed(smartlist_t *failed,
int status_code);
static void dir_routerdesc_download_failed(smartlist_t *failed,
int status_code,
int router_purpose,
int was_extrainfo,
int was_descriptor_digests);
static void note_client_request(int purpose, int compressed, size_t bytes);
static int client_likes_consensus(networkstatus_t *v, const char *want_url);
static void directory_initiate_command_rend(const char *address,
const tor_addr_t *addr,
uint16_t or_port,
uint16_t dir_port,
int supports_conditional_consensus,
int supports_begindir,
const char *digest,
uint8_t dir_purpose,
uint8_t router_purpose,
int anonymized_connection,
const char *resource,
const char *payload,
size_t payload_len,
time_t if_modified_since,
const rend_data_t *rend_query);
/********* START VARIABLES **********/
/** How far in the future do we allow a directory server to tell us it is
* before deciding that one of us has the wrong time? */
#define ALLOW_DIRECTORY_TIME_SKEW (30*60)
#define X_ADDRESS_HEADER "X-Your-Address-Is: "
/** HTTP cache control: how long do we tell proxies they can cache each
* kind of document we serve? */
#define FULL_DIR_CACHE_LIFETIME (60*60)
#define RUNNINGROUTERS_CACHE_LIFETIME (20*60)
#define DIRPORTFRONTPAGE_CACHE_LIFETIME (20*60)
#define NETWORKSTATUS_CACHE_LIFETIME (5*60)
#define ROUTERDESC_CACHE_LIFETIME (30*60)
#define ROUTERDESC_BY_DIGEST_CACHE_LIFETIME (48*60*60)
#define ROBOTS_CACHE_LIFETIME (24*60*60)
/********* END VARIABLES ************/
/** Return true iff the directory purpose 'purpose' must use an
* anonymous connection to a directory. */
static int
purpose_needs_anonymity(uint8_t dir_purpose, uint8_t router_purpose)
{
if (get_options()->AllDirActionsPrivate)
return 1;
if (router_purpose == ROUTER_PURPOSE_BRIDGE && has_completed_circuit)
return 1; /* if no circuits yet, we may need this info to bootstrap. */
if (dir_purpose == DIR_PURPOSE_UPLOAD_DIR ||
dir_purpose == DIR_PURPOSE_UPLOAD_VOTE ||
dir_purpose == DIR_PURPOSE_UPLOAD_SIGNATURES ||
dir_purpose == DIR_PURPOSE_FETCH_V2_NETWORKSTATUS ||
dir_purpose == DIR_PURPOSE_FETCH_STATUS_VOTE ||
dir_purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES ||
dir_purpose == DIR_PURPOSE_FETCH_CONSENSUS ||
dir_purpose == DIR_PURPOSE_FETCH_CERTIFICATE ||
dir_purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
dir_purpose == DIR_PURPOSE_FETCH_EXTRAINFO)
return 0;
return 1;
}
/** Return a newly allocated string describing <b>auth</b>. */
char *
authority_type_to_string(authority_type_t auth)
{
char *result;
smartlist_t *lst = smartlist_create();
if (auth & V1_AUTHORITY)
smartlist_add(lst, (void*)"V1");
if (auth & V2_AUTHORITY)
smartlist_add(lst, (void*)"V2");
if (auth & BRIDGE_AUTHORITY)
smartlist_add(lst, (void*)"Bridge");
if (auth & HIDSERV_AUTHORITY)
smartlist_add(lst, (void*)"Hidden service");
if (smartlist_len(lst)) {
result = smartlist_join_strings(lst, ", ", 0, NULL);
} else {
result = tor_strdup("[Not an authority]");
}
smartlist_free(lst);
return result;
}
/** Return a string describing a given directory connection purpose. */
static const char *
dir_conn_purpose_to_string(int purpose)
{
switch (purpose)
{
case DIR_PURPOSE_FETCH_RENDDESC:
return "hidden-service descriptor fetch";
case DIR_PURPOSE_UPLOAD_DIR:
return "server descriptor upload";
case DIR_PURPOSE_UPLOAD_RENDDESC:
return "hidden-service descriptor upload";
case DIR_PURPOSE_UPLOAD_VOTE:
return "server vote upload";
case DIR_PURPOSE_UPLOAD_SIGNATURES:
return "consensus signature upload";
case DIR_PURPOSE_FETCH_V2_NETWORKSTATUS:
return "network-status fetch";
case DIR_PURPOSE_FETCH_SERVERDESC:
return "server descriptor fetch";
case DIR_PURPOSE_FETCH_EXTRAINFO:
return "extra-info fetch";
case DIR_PURPOSE_FETCH_CONSENSUS:
return "consensus network-status fetch";
case DIR_PURPOSE_FETCH_CERTIFICATE:
return "authority cert fetch";
case DIR_PURPOSE_FETCH_STATUS_VOTE:
return "status vote fetch";
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
return "consensus signature fetch";
case DIR_PURPOSE_FETCH_RENDDESC_V2:
return "hidden-service v2 descriptor fetch";
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
return "hidden-service v2 descriptor upload";
}
log_warn(LD_BUG, "Called with unknown purpose %d", purpose);
return "(unknown)";
}
/** Return true iff <b>identity_digest</b> is the digest of a router we
* believe to support extrainfo downloads. (If <b>is_authority</b> we do
* additional checking that's only valid for authorities.) */
int
router_supports_extrainfo(const char *identity_digest, int is_authority)
{
routerinfo_t *ri = router_get_by_digest(identity_digest);
if (ri) {
if (ri->caches_extra_info)
return 1;
if (is_authority && ri->platform &&
tor_version_as_new_as(ri->platform, "Tor 0.2.0.0-alpha-dev (r10070)"))
return 1;
}
if (is_authority) {
routerstatus_t *rs = router_get_consensus_status_by_id(identity_digest);
if (rs && rs->version_supports_extrainfo_upload)
return 1;
}
return 0;
}
/** Return true iff any trusted directory authority has accepted our
* server descriptor.
*
* We consider any authority sufficient because waiting for all of
* them means it never happens while any authority is down; we don't
* go for something more complex in the middle (like \>1/3 or \>1/2 or
* \>=1/2) because that doesn't seem necessary yet.
*/
int
directories_have_accepted_server_descriptor(void)
{
smartlist_t *servers = router_get_trusted_dir_servers();
or_options_t *options = get_options();
SMARTLIST_FOREACH(servers, trusted_dir_server_t *, d, {
if ((d->type & options->_PublishServerDescriptor) &&
d->has_accepted_serverdesc) {
return 1;
}
});
return 0;
}
/** Start a connection to every suitable directory authority, using
* connection purpose 'purpose' and uploading the payload 'payload'
* (length 'payload_len'). The purpose should be one of
* 'DIR_PURPOSE_UPLOAD_DIR' or 'DIR_PURPOSE_UPLOAD_RENDDESC'.
*
* <b>type</b> specifies what sort of dir authorities (V1, V2,
* HIDSERV, BRIDGE) we should upload to.
*
* If <b>extrainfo_len</b> is nonzero, the first <b>payload_len</b> bytes of
* <b>payload</b> hold a router descriptor, and the next <b>extrainfo_len</b>
* bytes of <b>payload</b> hold an extra-info document. Upload the descriptor
* to all authorities, and the extra-info document to all authorities that
* support it.
*/
void
directory_post_to_dirservers(uint8_t dir_purpose, uint8_t router_purpose,
authority_type_t type,
const char *payload,
size_t payload_len, size_t extrainfo_len)
{
int post_via_tor;
smartlist_t *dirservers = router_get_trusted_dir_servers();
int found = 0;
tor_assert(dirservers);
/* This tries dirservers which we believe to be down, but ultimately, that's
* harmless, and we may as well err on the side of getting things uploaded.
*/
SMARTLIST_FOREACH_BEGIN(dirservers, trusted_dir_server_t *, ds) {
routerstatus_t *rs = &(ds->fake_status);
size_t upload_len = payload_len;
tor_addr_t ds_addr;
if ((type & ds->type) == 0)
continue;
found = 1; /* at least one authority of this type was listed */
if (dir_purpose == DIR_PURPOSE_UPLOAD_DIR)
ds->has_accepted_serverdesc = 0;
if (extrainfo_len && router_supports_extrainfo(ds->digest, 1)) {
upload_len += extrainfo_len;
log_info(LD_DIR, "Uploading an extrainfo (length %d)",
(int) extrainfo_len);
}
tor_addr_from_ipv4h(&ds_addr, ds->addr);
post_via_tor = purpose_needs_anonymity(dir_purpose, router_purpose) ||
!fascist_firewall_allows_address_dir(&ds_addr, ds->dir_port);
directory_initiate_command_routerstatus(rs, dir_purpose,
router_purpose,
post_via_tor,
NULL, payload, upload_len, 0);
} SMARTLIST_FOREACH_END(ds);
if (!found) {
char *s = authority_type_to_string(type);
log_warn(LD_DIR, "Publishing server descriptor to directory authorities "
"of type '%s', but no authorities of that type listed!", s);
tor_free(s);
}
}
/** Start a connection to a random running directory server, using
* connection purpose <b>dir_purpose</b>, intending to fetch descriptors
* of purpose <b>router_purpose</b>, and requesting <b>resource</b>.
* Use <b>pds_flags</b> as arguments to router_pick_directory_server()
* or router_pick_trusteddirserver().
*/
void
directory_get_from_dirserver(uint8_t dir_purpose, uint8_t router_purpose,
const char *resource, int pds_flags)
{
routerstatus_t *rs = NULL;
or_options_t *options = get_options();
int prefer_authority = directory_fetches_from_authorities(options);
int get_via_tor = purpose_needs_anonymity(dir_purpose, router_purpose);
authority_type_t type;
time_t if_modified_since = 0;
/* FFFF we could break this switch into its own function, and call
* it elsewhere in directory.c. -RD */
switch (dir_purpose) {
case DIR_PURPOSE_FETCH_EXTRAINFO:
type = EXTRAINFO_CACHE |
(router_purpose == ROUTER_PURPOSE_BRIDGE ? BRIDGE_AUTHORITY :
V2_AUTHORITY);
break;
case DIR_PURPOSE_FETCH_V2_NETWORKSTATUS:
case DIR_PURPOSE_FETCH_SERVERDESC:
type = (router_purpose == ROUTER_PURPOSE_BRIDGE ? BRIDGE_AUTHORITY :
V2_AUTHORITY);
break;
case DIR_PURPOSE_FETCH_RENDDESC:
type = HIDSERV_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_STATUS_VOTE:
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
type = V3_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_CONSENSUS:
case DIR_PURPOSE_FETCH_CERTIFICATE:
type = V3_AUTHORITY;
break;
default:
log_warn(LD_BUG, "Unexpected purpose %d", (int)dir_purpose);
return;
}
if (DIR_PURPOSE_FETCH_CONSENSUS) {
networkstatus_t *v = networkstatus_get_latest_consensus();
if (v)
if_modified_since = v->valid_after + 180;
}
if (!options->FetchServerDescriptors && type != HIDSERV_AUTHORITY)
return;
if (!get_via_tor) {
if (options->UseBridges && type != BRIDGE_AUTHORITY) {
/* want to ask a running bridge for which we have a descriptor. */
/* XXX022 we assume that all of our bridges can answer any
* possible directory question. This won't be true forever. -RD */
/* It certainly is not true with conditional consensus downloading,
* so, for now, never assume the server supports that. */
routerinfo_t *ri = choose_random_entry(NULL);
if (ri) {
tor_addr_t addr;
tor_addr_from_ipv4h(&addr, ri->addr);
directory_initiate_command(ri->address, &addr,
ri->or_port, 0,
0, /* don't use conditional consensus url */
1, ri->cache_info.identity_digest,
dir_purpose,
router_purpose,
0, resource, NULL, 0, if_modified_since);
} else
log_notice(LD_DIR, "Ignoring directory request, since no bridge "
"nodes are available yet.");
return;
} else {
if (prefer_authority || type == BRIDGE_AUTHORITY) {
/* only ask authdirservers, and don't ask myself */
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs == NULL && (pds_flags & PDS_NO_EXISTING_SERVERDESC_FETCH)) {
/* We don't want to fetch from any authorities that we're currently
* fetching server descriptors from, and we got no match. Did we
* get no match because all the authorities have connections
* fetching server descriptors (in which case we should just
* return,) or because all the authorities are down or on fire or
* unreachable or something (in which case we should go on with
* our fallback code)? */
pds_flags &= ~PDS_NO_EXISTING_SERVERDESC_FETCH;
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs) {
log_debug(LD_DIR, "Deferring serverdesc fetch: all authorities "
"are in use.");
return;
}
}
}
if (!rs && type != BRIDGE_AUTHORITY) {
/* anybody with a non-zero dirport will do */
rs = router_pick_directory_server(type, pds_flags);
if (!rs) {
log_info(LD_DIR, "No router found for %s; falling back to "
"dirserver list.", dir_conn_purpose_to_string(dir_purpose));
rs = router_pick_trusteddirserver(type, pds_flags);
if (!rs)
get_via_tor = 1; /* last resort: try routing it via Tor */
}
}
}
} else { /* get_via_tor */
/* Never use fascistfirewall; we're going via Tor. */
if (dir_purpose == DIR_PURPOSE_FETCH_RENDDESC) {
/* only ask hidserv authorities, any of them will do */
pds_flags |= PDS_IGNORE_FASCISTFIREWALL|PDS_ALLOW_SELF;
rs = router_pick_trusteddirserver(HIDSERV_AUTHORITY, pds_flags);
} else {
/* anybody with a non-zero dirport will do. Disregard firewalls. */
pds_flags |= PDS_IGNORE_FASCISTFIREWALL;
rs = router_pick_directory_server(type, pds_flags);
/* If we have any hope of building an indirect conn, we know some router
* descriptors. If (rs==NULL), we can't build circuits anyway, so
* there's no point in falling back to the authorities in this case. */
}
}
if (rs)
directory_initiate_command_routerstatus(rs, dir_purpose,
router_purpose,
get_via_tor,
resource, NULL, 0,
if_modified_since);
else {
log_notice(LD_DIR,
"While fetching directory info, "
"no running dirservers known. Will try again later. "
"(purpose %d)", dir_purpose);
if (!purpose_needs_anonymity(dir_purpose, router_purpose)) {
/* remember we tried them all and failed. */
directory_all_unreachable(time(NULL));
}
}
}
/** As directory_get_from_dirserver, but initiates a request to <i>every</i>
* directory authority other than ourself. Only for use by authorities when
* searching for missing information while voting. */
void
directory_get_from_all_authorities(uint8_t dir_purpose,
uint8_t router_purpose,
const char *resource)
{
tor_assert(dir_purpose == DIR_PURPOSE_FETCH_STATUS_VOTE ||
dir_purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES);
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
trusted_dir_server_t *, ds,
{
routerstatus_t *rs;
if (router_digest_is_me(ds->digest))
continue;
if (!(ds->type & V3_AUTHORITY))
continue;
rs = &ds->fake_status;
directory_initiate_command_routerstatus(rs, dir_purpose, router_purpose,
0, resource, NULL, 0, 0);
});
}
/** Same as directory_initiate_command_routerstatus(), but accepts
* rendezvous data to fetch a hidden service descriptor. */
void
directory_initiate_command_routerstatus_rend(routerstatus_t *status,
uint8_t dir_purpose,
uint8_t router_purpose,
int anonymized_connection,
const char *resource,
const char *payload,
size_t payload_len,
time_t if_modified_since,
const rend_data_t *rend_query)
{
routerinfo_t *router;
char address_buf[INET_NTOA_BUF_LEN+1];
struct in_addr in;
const char *address;
tor_addr_t addr;
router = router_get_by_digest(status->identity_digest);
if (!router && anonymized_connection) {
log_info(LD_DIR, "Not sending anonymized request to directory '%s'; we "
"don't have its router descriptor.", status->nickname);
return;
} else if (router) {
address = router->address;
} else {
in.s_addr = htonl(status->addr);
tor_inet_ntoa(&in, address_buf, sizeof(address_buf));
address = address_buf;
}
tor_addr_from_ipv4h(&addr, status->addr);
directory_initiate_command_rend(address, &addr,
status->or_port, status->dir_port,
status->version_supports_conditional_consensus,
status->version_supports_begindir,
status->identity_digest,
dir_purpose, router_purpose,
anonymized_connection, resource,
payload, payload_len, if_modified_since,
rend_query);
}
/** Launch a new connection to the directory server <b>status</b> to
* upload or download a server or rendezvous
* descriptor. <b>dir_purpose</b> determines what
* kind of directory connection we're launching, and must be one of
* DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC|RENDDESC_V2}. <b>router_purpose</b>
* specifies the descriptor purposes we have in mind (currently only
* used for FETCH_DIR).
*
* When uploading, <b>payload</b> and <b>payload_len</b> determine the content
* of the HTTP post. Otherwise, <b>payload</b> should be NULL.
*
* When fetching a rendezvous descriptor, <b>resource</b> is the service ID we
* want to fetch.
*/
void
directory_initiate_command_routerstatus(routerstatus_t *status,
uint8_t dir_purpose,
uint8_t router_purpose,
int anonymized_connection,
const char *resource,
const char *payload,
size_t payload_len,
time_t if_modified_since)
{
directory_initiate_command_routerstatus_rend(status, dir_purpose,
router_purpose,
anonymized_connection, resource,
payload, payload_len,
if_modified_since, NULL);
}
/** Return true iff <b>conn</b> is the client side of a directory connection
* we launched to ourself in order to determine the reachability of our
* dir_port. */
static int
directory_conn_is_self_reachability_test(dir_connection_t *conn)
{
if (conn->requested_resource &&
!strcmpstart(conn->requested_resource,"authority")) {
routerinfo_t *me = router_get_my_routerinfo();
if (me &&
router_digest_is_me(conn->identity_digest) &&
tor_addr_eq_ipv4h(&conn->_base.addr, me->addr) && /*XXXX prop 118*/
me->dir_port == conn->_base.port)
return 1;
}
return 0;
}
/** Called when we are unable to complete the client's request to a directory
* server due to a network error: Mark the router as down and try again if
* possible.
*/
void
connection_dir_request_failed(dir_connection_t *conn)
{
if (directory_conn_is_self_reachability_test(conn)) {
routerinfo_t *me = router_get_my_routerinfo();
if (me)
control_event_server_status(LOG_WARN,
"REACHABILITY_FAILED DIRADDRESS=%s:%d",
me->address, me->dir_port);
return; /* this was a test fetch. don't retry. */
}
if (entry_list_can_grow(get_options()))
router_set_status(conn->identity_digest, 0); /* don't try him again */
if (conn->_base.purpose == DIR_PURPOSE_FETCH_V2_NETWORKSTATUS) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
conn->_base.address);
connection_dir_download_networkstatus_failed(conn, -1);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
conn->_base.address);
connection_dir_download_routerdesc_failed(conn);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
networkstatus_consensus_download_failed(0);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_CERTIFICATE) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
conn->_base.address);
connection_dir_download_cert_failed(conn, 0);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES) {
log_info(LD_DIR, "Giving up downloading detached signatures from '%s'",
conn->_base.address);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE) {
log_info(LD_DIR, "Giving up downloading votes from '%s'",
conn->_base.address);
}
}
/** Called when an attempt to download one or more network status
* documents on connection <b>conn</b> failed. Decide whether to
* retry the fetch now, later, or never.
*/
static void
connection_dir_download_networkstatus_failed(dir_connection_t *conn,
int status_code)
{
if (!conn->requested_resource) {
/* We never reached directory_send_command, which means that we never
* opened a network connection. Either we're out of sockets, or the
* network is down. Either way, retrying would be pointless. */
return;
}
if (!strcmpstart(conn->requested_resource, "all")) {
/* We're a non-authoritative directory cache; try again. Ignore status
* code, since we don't want to keep trying forever in a tight loop
* if all the authorities are shutting us out. */
smartlist_t *trusted_dirs = router_get_trusted_dir_servers();
SMARTLIST_FOREACH(trusted_dirs, trusted_dir_server_t *, ds,
download_status_failed(&ds->v2_ns_dl_status, 0));
directory_get_from_dirserver(conn->_base.purpose, conn->router_purpose,
"all.z", 0 /* don't retry_if_no_servers */);
} else if (!strcmpstart(conn->requested_resource, "fp/")) {
/* We were trying to download by fingerprint; mark them all as having
* failed, and possibly retry them later.*/
smartlist_t *failed = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+3,
failed, NULL, 0, 0);
if (smartlist_len(failed)) {
dir_networkstatus_download_failed(failed, status_code);
SMARTLIST_FOREACH(failed, char *, cp, tor_free(cp));
}
smartlist_free(failed);
}
}
/** Called when an attempt to download one or more router descriptors
* or extra-info documents on connection <b>conn</b> failed.
*/
static void
connection_dir_download_routerdesc_failed(dir_connection_t *conn)
{
/* No need to increment the failure count for routerdescs, since
* it's not their fault. */
/* No need to relaunch descriptor downloads here: we already do it
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
tor_assert(conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
(void) conn;
}
/** Called when an attempt to fetch a certificate fails. */
static void
connection_dir_download_cert_failed(dir_connection_t *conn, int status)
{
smartlist_t *failed;
tor_assert(conn->_base.purpose == DIR_PURPOSE_FETCH_CERTIFICATE);
if (!conn->requested_resource)
return;
failed = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+3,
failed, NULL, 1, 0);
SMARTLIST_FOREACH(failed, char *, cp,
{
authority_cert_dl_failed(cp, status);
tor_free(cp);
});
smartlist_free(failed);
update_certificate_downloads(time(NULL));
}
/** Evaluate the situation and decide if we should use an encrypted
* "begindir-style" connection for this directory request.
* 1) If or_port is 0, or it's a direct conn and or_port is firewalled
* or we're a dir mirror, no.
* 2) If we prefer to avoid begindir conns, and we're not fetching or
* publishing a bridge relay descriptor, no.
* 3) Else yes.
*/
static int
directory_command_should_use_begindir(or_options_t *options,
const tor_addr_t *addr,
int or_port, uint8_t router_purpose,
int anonymized_connection)
{
if (!or_port)
return 0; /* We don't know an ORPort -- no chance. */
if (!anonymized_connection)
if (!fascist_firewall_allows_address_or(addr, or_port) ||
directory_fetches_from_authorities(options))
return 0; /* We're firewalled or are acting like a relay -- also no. */
if (!options->TunnelDirConns &&
router_purpose != ROUTER_PURPOSE_BRIDGE)
return 0; /* We prefer to avoid using begindir conns. Fine. */
return 1;
}
/** Helper for directory_initiate_command_routerstatus: send the
* command to a server whose address is <b>address</b>, whose IP is
* <b>addr</b>, whose directory port is <b>dir_port</b>, whose tor version
* <b>supports_begindir</b>, and whose identity key digest is
* <b>digest</b>. */
void
directory_initiate_command(const char *address, const tor_addr_t *_addr,
uint16_t or_port, uint16_t dir_port,
int supports_conditional_consensus,
int supports_begindir, const char *digest,
uint8_t dir_purpose, uint8_t router_purpose,
int anonymized_connection, const char *resource,
const char *payload, size_t payload_len,
time_t if_modified_since)
{
directory_initiate_command_rend(address, _addr, or_port, dir_port,
supports_conditional_consensus,
supports_begindir, digest, dir_purpose,
router_purpose, anonymized_connection,
resource, payload, payload_len,
if_modified_since, NULL);
}
/** Same as directory_initiate_command(), but accepts rendezvous data to
* fetch a hidden service descriptor. */
static void
directory_initiate_command_rend(const char *address, const tor_addr_t *_addr,
uint16_t or_port, uint16_t dir_port,
int supports_conditional_consensus,
int supports_begindir, const char *digest,
uint8_t dir_purpose, uint8_t router_purpose,
int anonymized_connection,
const char *resource,
const char *payload, size_t payload_len,
time_t if_modified_since,
const rend_data_t *rend_query)
{
dir_connection_t *conn;
or_options_t *options = get_options();
int socket_error = 0;
int use_begindir = supports_begindir &&
directory_command_should_use_begindir(options, _addr,
or_port, router_purpose, anonymized_connection);
tor_addr_t addr;
tor_assert(address);
tor_assert(_addr);
tor_assert(or_port || dir_port);
tor_assert(digest);
tor_addr_copy(&addr, _addr);
log_debug(LD_DIR, "anonymized %d, use_begindir %d.",
anonymized_connection, use_begindir);
log_debug(LD_DIR, "Initiating %s", dir_conn_purpose_to_string(dir_purpose));
conn = dir_connection_new(AF_INET);
/* set up conn so it's got all the data we need to remember */
tor_addr_copy(&conn->_base.addr, &addr);
conn->_base.port = use_begindir ? or_port : dir_port;
conn->_base.address = tor_strdup(address);
memcpy(conn->identity_digest, digest, DIGEST_LEN);
conn->_base.purpose = dir_purpose;
conn->router_purpose = router_purpose;
/* give it an initial state */
conn->_base.state = DIR_CONN_STATE_CONNECTING;
/* decide whether we can learn our IP address from this conn */
conn->dirconn_direct = !anonymized_connection;
/* copy rendezvous data, if any */
if (rend_query)
conn->rend_data = rend_data_dup(rend_query);
if (!anonymized_connection && !use_begindir) {
/* then we want to connect to dirport directly */
if (options->HttpProxy) {
tor_addr_from_ipv4h(&addr, options->HttpProxyAddr);
dir_port = options->HttpProxyPort;
}
switch (connection_connect(TO_CONN(conn), conn->_base.address, &addr,
dir_port, &socket_error)) {
case -1:
connection_dir_request_failed(conn); /* retry if we want */
/* XXX we only pass 'conn' above, not 'resource', 'payload',
* etc. So in many situations it can't retry! -RD */
connection_free(TO_CONN(conn));
return;
case 1:
/* start flushing conn */
conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING;
/* fall through */
case 0:
/* queue the command on the outbuf */
directory_send_command(conn, dir_purpose, 1, resource,
payload, payload_len,
supports_conditional_consensus,
if_modified_since);
connection_watch_events(TO_CONN(conn), EV_READ | EV_WRITE);
/* writable indicates finish, readable indicates broken link,
error indicates broken link in windowsland. */
}
} else { /* we want to connect via a tor connection */
edge_connection_t *linked_conn;
/* If it's an anonymized connection, remember the fact that we
* wanted it for later: maybe we'll want it again soon. */
if (anonymized_connection && use_begindir)
rep_hist_note_used_internal(time(NULL), 0, 1);
else if (anonymized_connection && !use_begindir)
rep_hist_note_used_port(time(NULL), conn->_base.port);
/* make an AP connection
* populate it and add it at the right state
* hook up both sides
*/
linked_conn =
connection_ap_make_link(conn->_base.address, conn->_base.port,
digest, use_begindir, conn->dirconn_direct);
if (!linked_conn) {
log_warn(LD_NET,"Making tunnel to dirserver failed.");
connection_mark_for_close(TO_CONN(conn));
return;
}
connection_link_connections(TO_CONN(conn), TO_CONN(linked_conn));
if (connection_add(TO_CONN(conn)) < 0) {
log_warn(LD_NET,"Unable to add connection for link to dirserver.");
connection_mark_for_close(TO_CONN(conn));
return;
}
conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING;
/* queue the command on the outbuf */
directory_send_command(conn, dir_purpose, 0, resource,
payload, payload_len,
supports_conditional_consensus,
if_modified_since);
connection_watch_events(TO_CONN(conn), EV_READ | EV_WRITE);
connection_start_reading(TO_CONN(linked_conn));
}
}
/** Return true iff anything we say on <b>conn</b> is being encrypted before
* we send it to the client/server. */
int
connection_dir_is_encrypted(dir_connection_t *conn)
{
/* Right now it's sufficient to see if conn is or has been linked, since
* the only thing it could be linked to is an edge connection on a
* circuit, and the only way it could have been unlinked is at the edge
* connection getting closed.
*/
return TO_CONN(conn)->linked;
}
/** Helper for sorting
*
* sort strings alphabetically
*/
static int
_compare_strs(const void **a, const void **b)
{
const char *s1 = *a, *s2 = *b;
return strcmp(s1, s2);
}
#define CONDITIONAL_CONSENSUS_FPR_LEN 3
#if (CONDITIONAL_CONSENSUS_FPR_LEN > DIGEST_LEN)
#error "conditional consensus fingerprint length is larger than digest length"
#endif
/** Return the URL we should use for a consensus download.
*
* This url depends on whether or not the server we go to
* is sufficiently new to support conditional consensus downloading,
* i.e. GET .../consensus/<b>fpr</b>+<b>fpr</b>+<b>fpr</b>
*/
static char *
directory_get_consensus_url(int supports_conditional_consensus)
{
char *url;
int len;
if (supports_conditional_consensus) {
char *authority_id_list;
smartlist_t *authority_digets = smartlist_create();
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
trusted_dir_server_t *, ds,
{
char *hex;
if (!(ds->type & V3_AUTHORITY))
continue;
hex = tor_malloc(2*CONDITIONAL_CONSENSUS_FPR_LEN+1);
base16_encode(hex, 2*CONDITIONAL_CONSENSUS_FPR_LEN+1,
ds->v3_identity_digest, CONDITIONAL_CONSENSUS_FPR_LEN);
smartlist_add(authority_digets, hex);
});
smartlist_sort(authority_digets, _compare_strs);
authority_id_list = smartlist_join_strings(authority_digets,
"+", 0, NULL);
len = strlen(authority_id_list)+64;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/status-vote/current/consensus/%s.z",
authority_id_list);
SMARTLIST_FOREACH(authority_digets, char *, cp, tor_free(cp));
smartlist_free(authority_digets);
tor_free(authority_id_list);
} else {
url = tor_strdup("/tor/status-vote/current/consensus.z");
}
return url;
}
/** Queue an appropriate HTTP command on conn-\>outbuf. The other args
* are as in directory_initiate_command.
*/
static void
directory_send_command(dir_connection_t *conn,
int purpose, int direct, const char *resource,
const char *payload, size_t payload_len,
int supports_conditional_consensus,
time_t if_modified_since)
{
char proxystring[256];
char proxyauthstring[256];
char hoststring[128];
char imsstring[RFC1123_TIME_LEN+32];
char *url;
char request[8192];
const char *httpcommand = NULL;
size_t len;
tor_assert(conn);
tor_assert(conn->_base.type == CONN_TYPE_DIR);
tor_free(conn->requested_resource);
if (resource)
conn->requested_resource = tor_strdup(resource);
/* come up with a string for which Host: we want */
if (conn->_base.port == 80) {
strlcpy(hoststring, conn->_base.address, sizeof(hoststring));
} else {
tor_snprintf(hoststring, sizeof(hoststring),"%s:%d",
conn->_base.address, conn->_base.port);
}
/* Format if-modified-since */
if (!if_modified_since) {
imsstring[0] = '\0';
} else {
char b[RFC1123_TIME_LEN+1];
format_rfc1123_time(b, if_modified_since);
tor_snprintf(imsstring, sizeof(imsstring), "\r\nIf-Modified-Since: %s", b);
}
/* come up with some proxy lines, if we're using one. */
if (direct && get_options()->HttpProxy) {
char *base64_authenticator=NULL;
const char *authenticator = get_options()->HttpProxyAuthenticator;
tor_snprintf(proxystring, sizeof(proxystring),"http://%s", hoststring);
if (authenticator) {
base64_authenticator = alloc_http_authenticator(authenticator);
if (!base64_authenticator)
log_warn(LD_BUG, "Encoding http authenticator failed");
}
if (base64_authenticator) {
tor_snprintf(proxyauthstring, sizeof(proxyauthstring),
"\r\nProxy-Authorization: Basic %s",
base64_authenticator);
tor_free(base64_authenticator);
} else {
proxyauthstring[0] = 0;
}
} else {
proxystring[0] = 0;
proxyauthstring[0] = 0;
}
switch (purpose) {
case DIR_PURPOSE_FETCH_V2_NETWORKSTATUS:
tor_assert(resource);
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/status/%s", resource);
break;
case DIR_PURPOSE_FETCH_CONSENSUS:
tor_assert(!resource);
tor_assert(!payload);
httpcommand = "GET";
url = directory_get_consensus_url(supports_conditional_consensus);
log_info(LD_DIR, "Downloading consensus from %s using %s",
hoststring, url);
break;
case DIR_PURPOSE_FETCH_CERTIFICATE:
tor_assert(resource);
tor_assert(!payload);
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/keys/%s", resource);
break;
case DIR_PURPOSE_FETCH_STATUS_VOTE:
tor_assert(resource);
tor_assert(!payload);
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/status-vote/next/%s.z", resource);
break;
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
tor_assert(!resource);
tor_assert(!payload);
httpcommand = "GET";
url = tor_strdup("/tor/status-vote/next/consensus-signatures.z");
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
tor_assert(resource);
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/server/%s", resource);
break;
case DIR_PURPOSE_FETCH_EXTRAINFO:
tor_assert(resource);
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/extra/%s", resource);
break;
case DIR_PURPOSE_UPLOAD_DIR:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/");
break;
case DIR_PURPOSE_UPLOAD_VOTE:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/post/vote");
break;
case DIR_PURPOSE_UPLOAD_SIGNATURES:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/post/consensus-signature");
break;
case DIR_PURPOSE_FETCH_RENDDESC:
tor_assert(resource);
tor_assert(!payload);
/* this must be true or we wouldn't be doing the lookup */
tor_assert(strlen(resource) <= REND_SERVICE_ID_LEN_BASE32);
/* This breaks the function abstraction. */
conn->rend_data = tor_malloc_zero(sizeof(rend_data_t));
strlcpy(conn->rend_data->onion_address, resource,
sizeof(conn->rend_data->onion_address));
conn->rend_data->rend_desc_version = 0;
httpcommand = "GET";
/* Request the most recent versioned descriptor. */
// (XXXX We were going to switch this to fetch rendezvous1 descriptors,
// but that never got testing, and it wasn't a good design.)
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/rendezvous/%s", resource);
break;
case DIR_PURPOSE_FETCH_RENDDESC_V2:
tor_assert(resource);
tor_assert(strlen(resource) <= REND_DESC_ID_V2_LEN_BASE32);
tor_assert(!payload);
conn->rend_data->rend_desc_version = 2;
httpcommand = "GET";
len = strlen(resource) + 32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/rendezvous2/%s", resource);
break;
case DIR_PURPOSE_UPLOAD_RENDDESC:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/rendezvous/publish");
break;
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/rendezvous2/publish");
break;
default:
tor_assert(0);
return;
}
if (strlen(proxystring) + strlen(url) >= 4096) {
log_warn(LD_BUG,
"Squid does not like URLs longer than 4095 bytes, and this "
"one is %d bytes long: %s%s",
(int)(strlen(proxystring) + strlen(url)), proxystring, url);
}
tor_snprintf(request, sizeof(request), "%s %s", httpcommand, proxystring);
connection_write_to_buf(request, strlen(request), TO_CONN(conn));
connection_write_to_buf(url, strlen(url), TO_CONN(conn));
tor_free(url);
if (!strcmp(httpcommand, "GET") && !payload) {
tor_snprintf(request, sizeof(request),
" HTTP/1.0\r\nHost: %s%s%s\r\n\r\n",
hoststring,
imsstring,
proxyauthstring);
} else {
tor_snprintf(request, sizeof(request),
" HTTP/1.0\r\nContent-Length: %lu\r\nHost: %s%s%s\r\n\r\n",
payload ? (unsigned long)payload_len : 0,
hoststring,
imsstring,
proxyauthstring);
}
connection_write_to_buf(request, strlen(request), TO_CONN(conn));
if (payload) {
/* then send the payload afterwards too */
connection_write_to_buf(payload, payload_len, TO_CONN(conn));
}
}
/** Parse an HTTP request string <b>headers</b> of the form
* \verbatim
* "\%s [http[s]://]\%s HTTP/1..."
* \endverbatim
* If it's well-formed, strdup the second \%s into *<b>url</b>, and
* nul-terminate it. If the url doesn't start with "/tor/", rewrite it
* so it does. Return 0.
* Otherwise, return -1.
*/
static int
parse_http_url(const char *headers, char **url)
{
char *s, *start, *tmp;
s = (char *)eat_whitespace_no_nl(headers);
if (!*s) return -1;
s = (char *)find_whitespace(s); /* get past GET/POST */
if (!*s) return -1;
s = (char *)eat_whitespace_no_nl(s);
if (!*s) return -1;
start = s; /* this is it, assuming it's valid */
s = (char *)find_whitespace(start);
if (!*s) return -1;
/* tolerate the http[s] proxy style of putting the hostname in the url */
if (s-start >= 4 && !strcmpstart(start,"http")) {
tmp = start + 4;
if (*tmp == 's')
tmp++;
if (s-tmp >= 3 && !strcmpstart(tmp,"://")) {
tmp = strchr(tmp+3, '/');
if (tmp && tmp < s) {
log_debug(LD_DIR,"Skipping over 'http[s]://hostname' string");
start = tmp;
}
}
}
if (s-start < 5 || strcmpstart(start,"/tor/")) { /* need to rewrite it */
*url = tor_malloc(s - start + 5);
strlcpy(*url,"/tor", s-start+5);
strlcat((*url)+4, start, s-start+1);
} else {
*url = tor_strndup(start, s-start);
}
return 0;
}
/** Return a copy of the first HTTP header in <b>headers</b> whose key is
* <b>which</b>. The key should be given with a terminating colon and space;
* this function copies everything after, up to but not including the
* following \\r\\n. */
static char *
http_get_header(const char *headers, const char *which)
{
const char *cp = headers;
while (cp) {
if (!strcasecmpstart(cp, which)) {
char *eos;
cp += strlen(which);
if ((eos = strchr(cp,'\r')))
return tor_strndup(cp, eos-cp);
else
return tor_strdup(cp);
}
cp = strchr(cp, '\n');
if (cp)
++cp;
}
return NULL;
}
/** If <b>headers</b> indicates that a proxy was involved, then rewrite
* <b>conn</b>-\>address to describe our best guess of the address that
* originated this HTTP request. */
static void
http_set_address_origin(const char *headers, connection_t *conn)
{
char *fwd;
fwd = http_get_header(headers, "Forwarded-For: ");
if (!fwd)
fwd = http_get_header(headers, "X-Forwarded-For: ");
if (fwd) {
struct in_addr in;
if (!tor_inet_aton(fwd, &in) || is_internal_IP(ntohl(in.s_addr), 0)) {
log_debug(LD_DIR, "Ignoring unrecognized or internal IP %s",
escaped(fwd));
tor_free(fwd);
return;
}
tor_free(conn->address);
conn->address = tor_strdup(fwd);
tor_free(fwd);
}
}
/** Parse an HTTP response string <b>headers</b> of the form
* \verbatim
* "HTTP/1.\%d \%d\%s\r\n...".
* \endverbatim
*
* If it's well-formed, assign the status code to *<b>code</b> and
* return 0. Otherwise, return -1.
*
* On success: If <b>date</b> is provided, set *date to the Date
* header in the http headers, or 0 if no such header is found. If
* <b>compression</b> is provided, set *<b>compression</b> to the
* compression method given in the Content-Encoding header, or 0 if no
* such header is found, or -1 if the value of the header is not
* recognized. If <b>reason</b> is provided, strdup the reason string
* into it.
*/
int
parse_http_response(const char *headers, int *code, time_t *date,
compress_method_t *compression, char **reason)
{
int n1, n2;
char datestr[RFC1123_TIME_LEN+1];
smartlist_t *parsed_headers;
tor_assert(headers);
tor_assert(code);
while (TOR_ISSPACE(*headers)) headers++; /* tolerate leading whitespace */
if (sscanf(headers, "HTTP/1.%d %d", &n1, &n2) < 2 ||
(n1 != 0 && n1 != 1) ||
(n2 < 100 || n2 >= 600)) {
log_warn(LD_HTTP,"Failed to parse header %s",escaped(headers));
return -1;
}
*code = n2;
parsed_headers = smartlist_create();
smartlist_split_string(parsed_headers, headers, "\n",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
if (reason) {
smartlist_t *status_line_elements = smartlist_create();
tor_assert(smartlist_len(parsed_headers));
smartlist_split_string(status_line_elements,
smartlist_get(parsed_headers, 0),
" ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 3);
tor_assert(smartlist_len(status_line_elements) <= 3);
if (smartlist_len(status_line_elements) == 3) {
*reason = smartlist_get(status_line_elements, 2);
smartlist_set(status_line_elements, 2, NULL); /* Prevent free */
}
SMARTLIST_FOREACH(status_line_elements, char *, cp, tor_free(cp));
smartlist_free(status_line_elements);
}
if (date) {
*date = 0;
SMARTLIST_FOREACH(parsed_headers, const char *, s,
if (!strcmpstart(s, "Date: ")) {
strlcpy(datestr, s+6, sizeof(datestr));
/* This will do nothing on failure, so we don't need to check
the result. We shouldn't warn, since there are many other valid
date formats besides the one we use. */
parse_rfc1123_time(datestr, date);
break;
});
}
if (compression) {
const char *enc = NULL;
SMARTLIST_FOREACH(parsed_headers, const char *, s,
if (!strcmpstart(s, "Content-Encoding: ")) {
enc = s+18; break;
});
if (!enc || !strcmp(enc, "identity")) {
*compression = NO_METHOD;
} else if (!strcmp(enc, "deflate") || !strcmp(enc, "x-deflate")) {
*compression = ZLIB_METHOD;
} else if (!strcmp(enc, "gzip") || !strcmp(enc, "x-gzip")) {
*compression = GZIP_METHOD;
} else {
log_info(LD_HTTP, "Unrecognized content encoding: %s. Trying to deal.",
escaped(enc));
*compression = UNKNOWN_METHOD;
}
}
SMARTLIST_FOREACH(parsed_headers, char *, s, tor_free(s));
smartlist_free(parsed_headers);
return 0;
}
/** Return true iff <b>body</b> doesn't start with a plausible router or
* running-list or directory opening. This is a sign of possible compression.
**/
static int
body_is_plausible(const char *body, size_t len, int purpose)
{
int i;
if (len == 0)
return 1; /* empty bodies don't need decompression */
if (len < 32)
return 0;
if (purpose != DIR_PURPOSE_FETCH_RENDDESC) {
if (!strcmpstart(body,"router") ||
!strcmpstart(body,"signed-directory") ||
!strcmpstart(body,"network-status") ||
!strcmpstart(body,"running-routers"))
return 1;
for (i=0;i<32;++i) {
if (!TOR_ISPRINT(body[i]) && !TOR_ISSPACE(body[i]))
return 0;
}
return 1;
} else {
return 1;
}
}
/** Called when we've just fetched a bunch of router descriptors in
* <b>body</b>. The list <b>which</b>, if present, holds digests for
* descriptors we requested: descriptor digests if <b>descriptor_digests</b>
* is true, or identity digests otherwise. Parse the descriptors, validate
* them, and annotate them as having purpose <b>purpose</b> and as having been
* downloaded from <b>source</b>.
*
* Return the number of routers actually added. */
static int
load_downloaded_routers(const char *body, smartlist_t *which,
int descriptor_digests,
int router_purpose,
const char *source)
{
char buf[256];
char time_buf[ISO_TIME_LEN+1];
int added = 0;
int general = router_purpose == ROUTER_PURPOSE_GENERAL;
format_iso_time(time_buf, time(NULL));
tor_assert(source);
if (tor_snprintf(buf, sizeof(buf),
"@downloaded-at %s\n"
"@source %s\n"
"%s%s%s", time_buf, escaped(source),
!general ? "@purpose " : "",
!general ? router_purpose_to_string(router_purpose) : "",
!general ? "\n" : "")<0)
return added;
added = router_load_routers_from_string(body, NULL, SAVED_NOWHERE, which,
descriptor_digests, buf);
control_event_bootstrap(BOOTSTRAP_STATUS_LOADING_DESCRIPTORS,
count_loading_descriptors_progress());
return added;
}
/** We are a client, and we've finished reading the server's
* response. Parse it and act appropriately.
*
* If we're still happy with using this directory server in the future, return
* 0. Otherwise return -1; and the caller should consider trying the request
* again.
*
* The caller will take care of marking the connection for close.
*/
static int
connection_dir_client_reached_eof(dir_connection_t *conn)
{
char *body;
char *headers;
char *reason = NULL;
size_t body_len=0, orig_len=0;
int status_code;
time_t date_header=0;
long delta;
compress_method_t compression;
int plausible;
int skewed=0;
int allow_partial = (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
int was_compressed=0;
time_t now = time(NULL);
switch (fetch_from_buf_http(conn->_base.inbuf,
&headers, MAX_HEADERS_SIZE,
&body, &body_len, MAX_DIR_DL_SIZE,
allow_partial)) {
case -1: /* overflow */
log_warn(LD_PROTOCOL,
"'fetch' response too large (server '%s:%d'). Closing.",
conn->_base.address, conn->_base.port);
return -1;
case 0:
log_info(LD_HTTP,
"'fetch' response not all here, but we're at eof. Closing.");
return -1;
/* case 1, fall through */
}
orig_len = body_len;
if (parse_http_response(headers, &status_code, &date_header,
&compression, &reason) < 0) {
log_warn(LD_HTTP,"Unparseable headers (server '%s:%d'). Closing.",
conn->_base.address, conn->_base.port);
tor_free(body); tor_free(headers);
return -1;
}
if (!reason) reason = tor_strdup("[no reason given]");
log_debug(LD_DIR,
"Received response from directory server '%s:%d': %d %s",
conn->_base.address, conn->_base.port, status_code,
escaped(reason));
/* now check if it's got any hints for us about our IP address. */
if (conn->dirconn_direct) {
char *guess = http_get_header(headers, X_ADDRESS_HEADER);
if (guess) {
router_new_address_suggestion(guess, conn);
tor_free(guess);
}
}
if (date_header > 0) {
/* The date header was written very soon after we sent our request,
* so compute the skew as the difference between sending the request
* and the date header. (We used to check now-date_header, but that's
* inaccurate if we spend a lot of time downloading.)
*/
delta = conn->_base.timestamp_lastwritten - date_header;
if (labs(delta)>ALLOW_DIRECTORY_TIME_SKEW) {
char dbuf[64];
int trusted = router_digest_is_trusted_dir(conn->identity_digest);
format_time_interval(dbuf, sizeof(dbuf), delta);
log_fn(trusted ? LOG_WARN : LOG_INFO,
LD_HTTP,
"Received directory with skewed time (server '%s:%d'): "
"It seems that our clock is %s by %s, or that theirs is %s. "
"Tor requires an accurate clock to work: please check your time, "
"timezone, and date settings.",
conn->_base.address, conn->_base.port,
delta>0 ? "ahead" : "behind", dbuf,
delta>0 ? "behind" : "ahead");
skewed = 1; /* don't check the recommended-versions line */
control_event_general_status(trusted ? LOG_WARN : LOG_NOTICE,
"CLOCK_SKEW SKEW=%ld SOURCE=DIRSERV:%s:%d",
delta, conn->_base.address, conn->_base.port);
} else {
log_debug(LD_HTTP, "Time on received directory is within tolerance; "
"we are %ld seconds skewed. (That's okay.)", delta);
}
}
(void) skewed; /* skewed isn't used yet. */
if (status_code == 503 && body_len < 16) {
routerstatus_t *rs;
trusted_dir_server_t *ds;
log_info(LD_DIR,"Received http status code %d (%s) from server "
"'%s:%d'. I'll try again soon.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
if ((rs = router_get_consensus_status_by_id(conn->identity_digest)))
rs->last_dir_503_at = now;
if ((ds = router_get_trusteddirserver_by_digest(conn->identity_digest)))
ds->fake_status.last_dir_503_at = now;
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
} else if (status_code == 503) {
/* XXXX022 Remove this once every server with bug 539 is obsolete. */
log_info(LD_DIR, "Server at '%s:%d' sent us a 503 response, but included "
"a body anyway. We'll pretend it gave us a 200.",
conn->_base.address, conn->_base.port);
status_code = 200;
}
plausible = body_is_plausible(body, body_len, conn->_base.purpose);
if (compression != NO_METHOD || !plausible) {
char *new_body = NULL;
size_t new_len = 0;
compress_method_t guessed = detect_compression_method(body, body_len);
if (compression == UNKNOWN_METHOD || guessed != compression) {
/* Tell the user if we don't believe what we're told about compression.*/
const char *description1, *description2;
if (compression == ZLIB_METHOD)
description1 = "as deflated";
else if (compression == GZIP_METHOD)
description1 = "as gzipped";
else if (compression == NO_METHOD)
description1 = "as uncompressed";
else
description1 = "with an unknown Content-Encoding";
if (guessed == ZLIB_METHOD)
description2 = "deflated";
else if (guessed == GZIP_METHOD)
description2 = "gzipped";
else if (!plausible)
description2 = "confusing binary junk";
else
description2 = "uncompressed";
log_info(LD_HTTP, "HTTP body from server '%s:%d' was labeled %s, "
"but it seems to be %s.%s",
conn->_base.address, conn->_base.port, description1,
description2,
(compression>0 && guessed>0)?" Trying both.":"");
}
/* Try declared compression first if we can. */
if (compression == GZIP_METHOD || compression == ZLIB_METHOD)
tor_gzip_uncompress(&new_body, &new_len, body, body_len, compression,
!allow_partial, LOG_PROTOCOL_WARN);
/* Okay, if that didn't work, and we think that it was compressed
* differently, try that. */
if (!new_body &&
(guessed == GZIP_METHOD || guessed == ZLIB_METHOD) &&
compression != guessed)
tor_gzip_uncompress(&new_body, &new_len, body, body_len, guessed,
!allow_partial, LOG_PROTOCOL_WARN);
/* If we're pretty sure that we have a compressed directory, and
* we didn't manage to uncompress it, then warn and bail. */
if (!plausible && !new_body) {
log_fn(LOG_PROTOCOL_WARN, LD_HTTP,
"Unable to decompress HTTP body (server '%s:%d').",
conn->_base.address, conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
if (new_body) {
tor_free(body);
body = new_body;
body_len = new_len;
was_compressed = 1;
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_V2_NETWORKSTATUS) {
smartlist_t *which = NULL;
v2_networkstatus_source_t source;
char *cp;
log_info(LD_DIR,"Received networkstatus objects (size %d) from server "
"'%s:%d'",(int) body_len, conn->_base.address, conn->_base.port);
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/status/%s\". I'll try again soon.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port, conn->requested_resource);
tor_free(body); tor_free(headers); tor_free(reason);
connection_dir_download_networkstatus_failed(conn, status_code);
return -1;
}
if (conn->requested_resource &&
!strcmpstart(conn->requested_resource,"fp/")) {
source = NS_FROM_DIR_BY_FP;
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+3,
which, NULL, 0, 0);
} else if (conn->requested_resource &&
!strcmpstart(conn->requested_resource, "all")) {
source = NS_FROM_DIR_ALL;
which = smartlist_create();
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
trusted_dir_server_t *, ds,
{
char *hex = tor_malloc(HEX_DIGEST_LEN+1);
base16_encode(hex, HEX_DIGEST_LEN+1, ds->digest, DIGEST_LEN);
smartlist_add(which, hex);
});
} else {
/* XXXX Can we even end up here? -- weasel*/
source = NS_FROM_DIR_BY_FP;
log_warn(LD_BUG, "We received a networkstatus but we didn't ask "
"for it by fp, nor did we ask for all.");
}
cp = body;
while (*cp) {
char *next = strstr(cp, "\nnetwork-status-version");
if (next)
next[1] = '\0';
/* learn from it, and then remove it from 'which' */
if (router_set_networkstatus_v2(cp, now, source, which)<0)
break;
if (next) {
next[1] = 'n';
cp = next+1;
} else
break;
}
/* launches router downloads as needed */
routers_update_all_from_networkstatus(now, 2);
directory_info_has_arrived(now, 0);
if (which) {
if (smartlist_len(which)) {
dir_networkstatus_download_failed(which, status_code);
}
SMARTLIST_FOREACH(which, char *, s, tor_free(s));
smartlist_free(which);
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
int r;
if (status_code != 200) {
int severity = (status_code == 304) ? LOG_INFO : LOG_WARN;
log(severity, LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching consensus directory.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
networkstatus_consensus_download_failed(status_code);
return -1;
}
log_info(LD_DIR,"Received consensus directory (size %d) from server "
"'%s:%d'",(int) body_len, conn->_base.address, conn->_base.port);
if ((r=networkstatus_set_current_consensus(body, 0))<0) {
log_fn(r<-1?LOG_WARN:LOG_INFO, LD_DIR,
"Unable to load consensus directory downloaded from "
"server '%s:%d'. I'll try again soon.",
conn->_base.address, conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
networkstatus_consensus_download_failed(0);
return -1;
}
/* launches router downloads as needed */
routers_update_all_from_networkstatus(now, 3);
directory_info_has_arrived(now, 0);
log_info(LD_DIR, "Successfully loaded consensus.");
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_CERTIFICATE) {
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/keys/%s\".",
status_code, escaped(reason), conn->_base.address,
conn->_base.port, conn->requested_resource);
connection_dir_download_cert_failed(conn, status_code);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
log_info(LD_DIR,"Received authority certificates (size %d) from server "
"'%s:%d'",(int) body_len, conn->_base.address, conn->_base.port);
if (trusted_dirs_load_certs_from_string(body, 0, 1)<0) {
log_warn(LD_DIR, "Unable to parse fetched certificates");
connection_dir_download_cert_failed(conn, status_code);
} else {
directory_info_has_arrived(now, 0);
log_info(LD_DIR, "Successfully loaded certificates from fetch.");
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE) {
const char *msg;
int st;
log_info(LD_DIR,"Got votes (size %d) from server %s:%d",
(int) body_len, conn->_base.address, conn->_base.port);
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/status-vote/next/%s.z\".",
status_code, escaped(reason), conn->_base.address,
conn->_base.port, conn->requested_resource);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
dirvote_add_vote(body, &msg, &st);
if (st > 299) {
log_warn(LD_DIR, "Error adding retrieved vote: %s", msg);
} else {
log_info(LD_DIR, "Added vote(s) successfully [msg: %s]", msg);
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES) {
const char *msg = NULL;
log_info(LD_DIR,"Got detached signatures (size %d) from server %s:%d",
(int) body_len, conn->_base.address, conn->_base.port);
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/status-vote/consensus-signatures.z\".",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
if (dirvote_add_signatures(body, conn->_base.address, &msg)<0) {
log_warn(LD_DIR, "Problem adding detached signatures from %s:%d: %s",
conn->_base.address, conn->_base.port, msg?msg:"???");
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO) {
int was_ei = conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO;
smartlist_t *which = NULL;
int n_asked_for = 0;
int descriptor_digests = conn->requested_resource &&
!strcmpstart(conn->requested_resource,"d/");
log_info(LD_DIR,"Received %s (size %d) from server '%s:%d'",
was_ei ? "extra server info" : "server info",
(int)body_len, conn->_base.address, conn->_base.port);
if (conn->requested_resource &&
(!strcmpstart(conn->requested_resource,"d/") ||
!strcmpstart(conn->requested_resource,"fp/"))) {
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource +
(descriptor_digests ? 2 : 3),
which, NULL, 0, 0);
n_asked_for = smartlist_len(which);
}
if (status_code != 200) {
int dir_okay = status_code == 404 ||
(status_code == 400 && !strcmp(reason, "Servers unavailable."));
/* 404 means that it didn't have them; no big deal.
* Older (pre-0.1.1.8) servers said 400 Servers unavailable instead. */
log_fn(dir_okay ? LOG_INFO : LOG_WARN, LD_DIR,
"Received http status code %d (%s) from server '%s:%d' "
"while fetching \"/tor/server/%s\". I'll try again soon.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port, conn->requested_resource);
if (!which) {
connection_dir_download_routerdesc_failed(conn);
} else {
dir_routerdesc_download_failed(which, status_code,
conn->router_purpose,
was_ei, descriptor_digests);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
tor_free(body); tor_free(headers); tor_free(reason);
return dir_okay ? 0 : -1;
}
/* Learn the routers, assuming we requested by fingerprint or "all"
* or "authority".
*
* We use "authority" to fetch our own descriptor for
* testing, and to fetch bridge descriptors for bootstrapping. Ignore
* the output of "authority" requests unless we are using bridges,
* since otherwise they'll be the response from reachability tests,
* and we don't really want to add that to our routerlist. */
if (which || (conn->requested_resource &&
(!strcmpstart(conn->requested_resource, "all") ||
(!strcmpstart(conn->requested_resource, "authority") &&
get_options()->UseBridges)))) {
/* as we learn from them, we remove them from 'which' */
if (was_ei) {
router_load_extrainfo_from_string(body, NULL, SAVED_NOWHERE, which,
descriptor_digests);
} else {
//router_load_routers_from_string(body, NULL, SAVED_NOWHERE, which,
// descriptor_digests, conn->router_purpose);
if (load_downloaded_routers(body, which, descriptor_digests,
conn->router_purpose,
conn->_base.address))
directory_info_has_arrived(now, 0);
}
}
if (which) { /* mark remaining ones as failed */
log_info(LD_DIR, "Received %d/%d %s requested from %s:%d",
n_asked_for-smartlist_len(which), n_asked_for,
was_ei ? "extra-info documents" : "router descriptors",
conn->_base.address, (int)conn->_base.port);
if (smartlist_len(which)) {
dir_routerdesc_download_failed(which, status_code,
conn->router_purpose,
was_ei, descriptor_digests);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
if (directory_conn_is_self_reachability_test(conn))
router_dirport_found_reachable();
}
if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_DIR) {
switch (status_code) {
case 200: {
trusted_dir_server_t *ds =
router_get_trusteddirserver_by_digest(conn->identity_digest);
char *rejected_hdr = http_get_header(headers,
"X-Descriptor-Not-New: ");
int rejected = 0;
if (rejected_hdr) {
if (!strcmp(rejected_hdr, "Yes")) {
/* XXXX use this information; be sure to upload next one
* sooner. -NM */
/* XXXX021 On further thought, the task above implies that we're
* basing our regenerate-descriptor time on when we uploaded the
* last descriptor, not on the published time of the last
* descriptor. If those are different, that's a bad thing to
* do. -NM */
rejected = 1;
}
tor_free(rejected_hdr);
}
log_info(LD_GENERAL,"eof (status 200) after uploading server "
"descriptor: finished.");
control_event_server_status(
LOG_NOTICE, "ACCEPTED_SERVER_DESCRIPTOR DIRAUTH=%s:%d",
conn->_base.address, conn->_base.port);
ds->has_accepted_serverdesc = 1;
if (directories_have_accepted_server_descriptor())
control_event_server_status(LOG_NOTICE, "GOOD_SERVER_DESCRIPTOR");
}
break;
case 400:
log_warn(LD_GENERAL,"http status 400 (%s) response from "
"dirserver '%s:%d'. Please correct.",
escaped(reason), conn->_base.address, conn->_base.port);
control_event_server_status(LOG_WARN,
"BAD_SERVER_DESCRIPTOR DIRAUTH=%s:%d REASON=\"%s\"",
conn->_base.address, conn->_base.port, escaped(reason));
break;
default:
log_warn(LD_GENERAL,
"http status %d (%s) reason unexpected while uploading "
"descriptor to server '%s:%d').",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
}
if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_VOTE) {
switch (status_code) {
case 200: {
log_notice(LD_DIR,"Uploaded a vote to dirserver %s:%d",
conn->_base.address, conn->_base.port);
}
break;
case 400:
log_warn(LD_DIR,"http status 400 (%s) response after uploading "
"vote to dirserver '%s:%d'. Please correct.",
escaped(reason), conn->_base.address, conn->_base.port);
break;
default:
log_warn(LD_GENERAL,
"http status %d (%s) reason unexpected while uploading "
"vote to server '%s:%d').",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
}
if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_SIGNATURES) {
switch (status_code) {
case 200: {
log_notice(LD_DIR,"Uploaded signature(s) to dirserver %s:%d",
conn->_base.address, conn->_base.port);
}
break;
case 400:
log_warn(LD_DIR,"http status 400 (%s) response after uploading "
"signatures to dirserver '%s:%d'. Please correct.",
escaped(reason), conn->_base.address, conn->_base.port);
break;
default:
log_warn(LD_GENERAL,
"http status %d (%s) reason unexpected while uploading "
"signatures to server '%s:%d').",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_RENDDESC) {
tor_assert(conn->rend_data);
log_info(LD_REND,"Received rendezvous descriptor (size %d, status %d "
"(%s))",
(int)body_len, status_code, escaped(reason));
switch (status_code) {
case 200:
if (rend_cache_store(body, body_len, 0) < -1) {
log_warn(LD_REND,"Failed to parse rendezvous descriptor.");
/* Any pending rendezvous attempts will notice when
* connection_about_to_close_connection()
* cleans this dir conn up. */
/* We could retry. But since v0 descriptors are going out of
* style, it isn't worth the hassle. We'll do better in v2. */
} else {
/* Success, or at least there's a v2 descriptor already
* present. Notify pending connections about this. */
conn->_base.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
rend_client_desc_trynow(conn->rend_data->onion_address, -1);
}
break;
case 404:
/* Not there. Pending connections will be notified when
* connection_about_to_close_connection() cleans this conn up. */
break;
case 400:
log_warn(LD_REND,
"http status 400 (%s). Dirserver didn't like our "
"rendezvous query?", escaped(reason));
break;
default:
log_warn(LD_REND,"http status %d (%s) response unexpected while "
"fetching hidden service descriptor (server '%s:%d').",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_RENDDESC_V2) {
tor_assert(conn->rend_data);
log_info(LD_REND,"Received rendezvous descriptor (size %d, status %d "
"(%s))",
(int)body_len, status_code, escaped(reason));
switch (status_code) {
case 200:
switch (rend_cache_store_v2_desc_as_client(body, conn->rend_data)) {
case -2:
log_warn(LD_REND,"Fetching v2 rendezvous descriptor failed. "
"Retrying at another directory.");
/* We'll retry when connection_about_to_close_connection()
* cleans this dir conn up. */
break;
case -1:
/* We already have a v0 descriptor here. Ignoring this one
* and _not_ performing another request. */
log_info(LD_REND, "Successfully fetched v2 rendezvous "
"descriptor, but we already have a v0 descriptor.");
conn->_base.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
break;
default:
/* success. notify pending connections about this. */
log_info(LD_REND, "Successfully fetched v2 rendezvous "
"descriptor.");
conn->_base.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
rend_client_desc_trynow(conn->rend_data->onion_address, -1);
break;
}
break;
case 404:
/* Not there. We'll retry when
* connection_about_to_close_connection() cleans this conn up. */
log_info(LD_REND,"Fetching v2 rendezvous descriptor failed: "
"Retrying at another directory.");
break;
case 400:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
"http status 400 (%s). Dirserver didn't like our "
"v2 rendezvous query? Retrying at another directory.",
escaped(reason));
break;
default:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
"http status %d (%s) response unexpected while "
"fetching v2 hidden service descriptor (server '%s:%d'). "
"Retrying at another directory.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
}
if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_RENDDESC ||
conn->_base.purpose == DIR_PURPOSE_UPLOAD_RENDDESC_V2) {
log_info(LD_REND,"Uploaded rendezvous descriptor (status %d "
"(%s))",
status_code, escaped(reason));
switch (status_code) {
case 200:
log_info(LD_REND,
"Uploading rendezvous descriptor: finished with status "
"200 (%s)", escaped(reason));
break;
case 400:
log_warn(LD_REND,"http status 400 (%s) response from dirserver "
"'%s:%d'. Malformed rendezvous descriptor?",
escaped(reason), conn->_base.address, conn->_base.port);
break;
case 503:
log_info(LD_REND,"http status 503 (%s) response from dirserver "
"'%s:%d'. Node is (currently) not acting as v2 hidden "
"service directory.",
escaped(reason), conn->_base.address, conn->_base.port);
break;
default:
log_warn(LD_REND,"http status %d (%s) response unexpected (server "
"'%s:%d').",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
break;
}
}
note_client_request(conn->_base.purpose, was_compressed, orig_len);
tor_free(body); tor_free(headers); tor_free(reason);
return 0;
}
/** Called when a directory connection reaches EOF. */
int
connection_dir_reached_eof(dir_connection_t *conn)
{
int retval;
if (conn->_base.state != DIR_CONN_STATE_CLIENT_READING) {
log_info(LD_HTTP,"conn reached eof, not reading. [state=%d] Closing.",
conn->_base.state);
connection_close_immediate(TO_CONN(conn)); /* error: give up on flushing */
connection_mark_for_close(TO_CONN(conn));
return -1;
}
retval = connection_dir_client_reached_eof(conn);
if (retval == 0) /* success */
conn->_base.state = DIR_CONN_STATE_CLIENT_FINISHED;
connection_mark_for_close(TO_CONN(conn));
return retval;
}
/** If any directory object is arriving, and it's over 10MB large, we're
* getting DoS'd. (As of 0.1.2.x, raw directories are about 1MB, and we never
* ask for more than 96 router descriptors at a time.)
*/
#define MAX_DIRECTORY_OBJECT_SIZE (10*(1<<20))
/** Read handler for directory connections. (That's connections <em>to</em>
* directory servers and connections <em>at</em> directory servers.)
*/
int
connection_dir_process_inbuf(dir_connection_t *conn)
{
tor_assert(conn);
tor_assert(conn->_base.type == CONN_TYPE_DIR);
/* Directory clients write, then read data until they receive EOF;
* directory servers read data until they get an HTTP command, then
* write their response (when it's finished flushing, they mark for
* close).
*/
/* If we're on the dirserver side, look for a command. */
if (conn->_base.state == DIR_CONN_STATE_SERVER_COMMAND_WAIT) {
if (directory_handle_command(conn) < 0) {
connection_mark_for_close(TO_CONN(conn));
return -1;
}
return 0;
}
if (buf_datalen(conn->_base.inbuf) > MAX_DIRECTORY_OBJECT_SIZE) {
log_warn(LD_HTTP, "Too much data received from directory connection: "
"denial of service attempt, or you need to upgrade?");
connection_mark_for_close(TO_CONN(conn));
return -1;
}
if (!conn->_base.inbuf_reached_eof)
log_debug(LD_HTTP,"Got data, not eof. Leaving on inbuf.");
return 0;
}
/** Create an http response for the client <b>conn</b> out of
* <b>status</b> and <b>reason_phrase</b>. Write it to <b>conn</b>.
*/
static void
write_http_status_line(dir_connection_t *conn, int status,
const char *reason_phrase)
{
char buf[256];
if (tor_snprintf(buf, sizeof(buf), "HTTP/1.0 %d %s\r\n\r\n",
status, reason_phrase ? reason_phrase : "OK") < 0) {
log_warn(LD_BUG,"status line too long.");
return;
}
connection_write_to_buf(buf, strlen(buf), TO_CONN(conn));
}
/** Write the header for an HTTP/1.0 response onto <b>conn</b>-\>outbuf,
* with <b>type</b> as the Content-Type.
*
* If <b>length</b> is nonnegative, it is the Content-Length.
* If <b>encoding</b> is provided, it is the Content-Encoding.
* If <b>cache_lifetime</b> is greater than 0, the content may be cached for
* up to cache_lifetime seconds. Otherwise, the content may not be cached. */
static void
write_http_response_header_impl(dir_connection_t *conn, ssize_t length,
const char *type, const char *encoding,
const char *extra_headers,
long cache_lifetime)
{
char date[RFC1123_TIME_LEN+1];
char tmp[1024];
char *cp;
time_t now = time(NULL);
tor_assert(conn);
format_rfc1123_time(date, now);
cp = tmp;
tor_snprintf(cp, sizeof(tmp),
"HTTP/1.0 200 OK\r\nDate: %s\r\n",
date);
cp += strlen(tmp);
if (type) {
tor_snprintf(cp, sizeof(tmp)-(cp-tmp), "Content-Type: %s\r\n", type);
cp += strlen(cp);
}
if (!is_local_addr(&conn->_base.addr)) {
/* Don't report the source address for a nearby/private connection.
* Otherwise we tend to mis-report in cases where incoming ports are
* being forwarded to a Tor server running behind the firewall. */
tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
X_ADDRESS_HEADER "%s\r\n", conn->_base.address);
cp += strlen(cp);
}
if (encoding) {
tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
"Content-Encoding: %s\r\n", encoding);
cp += strlen(cp);
}
if (length >= 0) {
tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
"Content-Length: %ld\r\n", (long)length);
cp += strlen(cp);
}
if (cache_lifetime > 0) {
char expbuf[RFC1123_TIME_LEN+1];
format_rfc1123_time(expbuf, now + cache_lifetime);
/* We could say 'Cache-control: max-age=%d' here if we start doing
* http/1.1 */
tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
"Expires: %s\r\n", expbuf);
cp += strlen(cp);
} else if (cache_lifetime == 0) {
/* We could say 'Cache-control: no-cache' here if we start doing
* http/1.1 */
strlcpy(cp, "Pragma: no-cache\r\n", sizeof(tmp)-(cp-tmp));
cp += strlen(cp);
}
if (extra_headers) {
strlcpy(cp, extra_headers, sizeof(tmp)-(cp-tmp));
cp += strlen(cp);
}
if (sizeof(tmp)-(cp-tmp) > 3)
memcpy(cp, "\r\n", 3);
else
tor_assert(0);
connection_write_to_buf(tmp, strlen(tmp), TO_CONN(conn));
}
/** As write_http_response_header_impl, but sets encoding and content-typed
* based on whether the response will be <b>compressed</b> or not. */
static void
write_http_response_header(dir_connection_t *conn, ssize_t length,
int compressed, long cache_lifetime)
{
write_http_response_header_impl(conn, length,
compressed?"application/octet-stream":"text/plain",
compressed?"deflate":"identity",
NULL,
cache_lifetime);
}
#ifdef INSTRUMENT_DOWNLOADS
typedef struct request_t {
uint64_t bytes; /**< How many bytes have we transferred? */
uint64_t count; /**< How many requests have we made? */
} request_t;
/** Map used to keep track of how much data we've up/downloaded in what kind
* of request. Maps from request type to pointer to request_t. */
static strmap_t *request_map = NULL;
/** Record that a client request of <b>purpose</b> was made, and that
* <b>bytes</b> bytes of possibly <b>compressed</b> data were sent/received.
* Used to keep track of how much we've up/downloaded in what kind of
* request. */
static void
note_client_request(int purpose, int compressed, size_t bytes)
{
char *key;
const char *kind = NULL;
switch (purpose) {
case DIR_PURPOSE_FETCH_V2_NETWORKSTATUS: kind = "dl/status"; break;
case DIR_PURPOSE_FETCH_CONSENSUS: kind = "dl/consensus"; break;
case DIR_PURPOSE_FETCH_CERTIFICATE: kind = "dl/cert"; break;
case DIR_PURPOSE_FETCH_STATUS_VOTE: kind = "dl/vote"; break;
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES: kind = "dl/detached_sig";
break;
case DIR_PURPOSE_FETCH_SERVERDESC: kind = "dl/server"; break;
case DIR_PURPOSE_FETCH_EXTRAINFO: kind = "dl/extra"; break;
case DIR_PURPOSE_UPLOAD_DIR: kind = "dl/ul-dir"; break;
case DIR_PURPOSE_UPLOAD_VOTE: kind = "dl/ul-vote"; break;
case DIR_PURPOSE_UPLOAD_SIGNATURES: kind = "dl/ul-sig"; break;
case DIR_PURPOSE_FETCH_RENDDESC: kind = "dl/rend"; break;
case DIR_PURPOSE_FETCH_RENDDESC_V2: kind = "dl/rend2"; break;
case DIR_PURPOSE_UPLOAD_RENDDESC: kind = "dl/ul-rend"; break;
case DIR_PURPOSE_UPLOAD_RENDDESC_V2: kind = "dl/ul-rend2"; break;
}
if (kind) {
key = tor_malloc(256);
tor_snprintf(key, 256, "%s%s", kind, compressed?".z":"");
} else {
key = tor_malloc(256);
tor_snprintf(key, 256, "unknown purpose (%d)%s",
purpose, compressed?".z":"");
}
note_request(key, bytes);
tor_free(key);
}
/** Helper: initialize the request map to instrument downloads. */
static void
ensure_request_map_initialized(void)
{
if (!request_map)
request_map = strmap_new();
}
/** Called when we just transmitted or received <b>bytes</b> worth of data
* because of a request of type <b>key</b> (an arbitrary identifier): adds
* <b>bytes</b> to the total associated with key. */
void
note_request(const char *key, size_t bytes)
{
request_t *r;
ensure_request_map_initialized();
r = strmap_get(request_map, key);
if (!r) {
r = tor_malloc_zero(sizeof(request_t));
strmap_set(request_map, key, r);
}
r->bytes += bytes;
r->count++;
}
/** Return a newly allocated string holding a summary of bytes used per
* request type. */
char *
directory_dump_request_log(void)
{
smartlist_t *lines;
char tmp[256];
char *result;
strmap_iter_t *iter;
ensure_request_map_initialized();
lines = smartlist_create();
for (iter = strmap_iter_init(request_map);
!strmap_iter_done(iter);
iter = strmap_iter_next(request_map, iter)) {
const char *key;
void *val;
request_t *r;
strmap_iter_get(iter, &key, &val);
r = val;
tor_snprintf(tmp, sizeof(tmp), "%s "U64_FORMAT" "U64_FORMAT"\n",
key, U64_PRINTF_ARG(r->bytes), U64_PRINTF_ARG(r->count));
smartlist_add(lines, tor_strdup(tmp));
}
smartlist_sort_strings(lines);
result = smartlist_join_strings(lines, "", 0, NULL);
SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
smartlist_free(lines);
return result;
}
#else
static void
note_client_request(int purpose, int compressed, size_t bytes)
{
(void)purpose;
(void)compressed;
(void)bytes;
}
void
note_request(const char *key, size_t bytes)
{
(void)key;
(void)bytes;
}
char *
directory_dump_request_log(void)
{
return tor_strdup("Not supported.");
}
#endif
/** Decide whether a client would accept the consensus we have
*
* Clients can say they only want a consensus if it's signed by more
* than half the authorities in a list. They pass this list in
* the url as "...consensus/<b>fpr</b>+<b>fpr</b>+<b>fpr</b>".
*
* <b>fpr</b> may be an abbreviated fingerprint, i.e. only a left substring
* of the full authority identity digest. (Only strings of even length,
* i.e. encodings of full bytes, are handled correctly. In the case
* of an odd number of hex digits the last one is silently ignored.)
*
* Returns 1 if more than half of the requested authorities signed the
* consensus, 0 otherwise.
*/
int
client_likes_consensus(networkstatus_t *v, const char *want_url)
{
smartlist_t *want_authorities = smartlist_create();
int need_at_least;
int have = 0;
dir_split_resource_into_fingerprints(want_url, want_authorities, NULL, 0, 0);
need_at_least = smartlist_len(want_authorities)/2+1;
SMARTLIST_FOREACH(want_authorities, const char *, d, {
char want_digest[DIGEST_LEN];
int want_len = strlen(d)/2;
if (want_len > DIGEST_LEN)
want_len = DIGEST_LEN;
if (base16_decode(want_digest, DIGEST_LEN, d, want_len*2) < 0) {
log_warn(LD_DIR,"Failed to decode requested authority digest %s.", d);
continue;
};
SMARTLIST_FOREACH(v->voters, networkstatus_voter_info_t *, vi, {
if (vi->signature &&
!memcmp(vi->identity_digest, want_digest, want_len)) {
have++;
break;
};
});
/* early exit, if we already have enough */
if (have >= need_at_least)
break;
});
SMARTLIST_FOREACH(want_authorities, char *, d, tor_free(d));
smartlist_free(want_authorities);
return (have >= need_at_least);
}
/** Helper function: called when a dirserver gets a complete HTTP GET
* request. Look for a request for a directory or for a rendezvous
* service descriptor. On finding one, write a response into
* conn-\>outbuf. If the request is unrecognized, send a 400.
* Always return 0. */
static int
directory_handle_command_get(dir_connection_t *conn, const char *headers,
const char *body, size_t body_len)
{
size_t dlen;
char *url, *url_mem, *header;
or_options_t *options = get_options();
time_t if_modified_since = 0;
int compressed;
size_t url_len;
/* We ignore the body of a GET request. */
(void)body;
(void)body_len;
log_debug(LD_DIRSERV,"Received GET command.");
conn->_base.state = DIR_CONN_STATE_SERVER_WRITING;
if (parse_http_url(headers, &url) < 0) {
write_http_status_line(conn, 400, "Bad request");
return 0;
}
if ((header = http_get_header(headers, "If-Modified-Since: "))) {
struct tm tm;
if (parse_http_time(header, &tm) == 0) {
if_modified_since = tor_timegm(&tm);
}
/* The correct behavior on a malformed If-Modified-Since header is to
* act as if no If-Modified-Since header had been given. */
tor_free(header);
}
log_debug(LD_DIRSERV,"rewritten url as '%s'.", url);
url_mem = url;
url_len = strlen(url);
compressed = url_len > 2 && !strcmp(url+url_len-2, ".z");
if (compressed) {
url[url_len-2] = '\0';
url_len -= 2;
}
if (!strcmp(url,"/tor/")) {
const char *frontpage = get_dirportfrontpage();
if (frontpage) {
dlen = strlen(frontpage);
/* Let's return a disclaimer page (users shouldn't use V1 anymore,
and caches don't fetch '/', so this is safe). */
if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
log_info(LD_DIRSERV,
"Client asked for DirPortFrontPage content, but we've been "
"writing too many bytes lately. Sending 503 Dir busy.");
write_http_status_line(conn, 503, "Directory busy, try again later");
goto done;
}
note_request(url, dlen);
write_http_response_header_impl(conn, dlen, "text/html", "identity",
NULL, DIRPORTFRONTPAGE_CACHE_LIFETIME);
connection_write_to_buf(frontpage, dlen, TO_CONN(conn));
goto done;
}
/* if no disclaimer file, fall through and continue */
}
if (!strcmp(url,"/tor/") || !strcmp(url,"/tor/dir")) { /* v1 dir fetch */
cached_dir_t *d = dirserv_get_directory();
if (!d) {
log_info(LD_DIRSERV,"Client asked for the mirrored directory, but we "
"don't have a good one yet. Sending 503 Dir not available.");
write_http_status_line(conn, 503, "Directory unavailable");
goto done;
}
if (d->published < if_modified_since) {
write_http_status_line(conn, 304, "Not modified");
goto done;
}
dlen = compressed ? d->dir_z_len : d->dir_len;
if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
log_debug(LD_DIRSERV,
"Client asked for the mirrored directory, but we've been "
"writing too many bytes lately. Sending 503 Dir busy.");
write_http_status_line(conn, 503, "Directory busy, try again later");
goto done;
}
note_request(url, dlen);
log_debug(LD_DIRSERV,"Dumping %sdirectory to client.",
compressed?"compressed ":"");
write_http_response_header(conn, dlen, compressed,
FULL_DIR_CACHE_LIFETIME);
conn->cached_dir = d;
conn->cached_dir_offset = 0;
if (!compressed)
conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD);
++d->refcnt;
/* Prime the connection with some data. */
conn->dir_spool_src = DIR_SPOOL_CACHED_DIR;
connection_dirserv_flushed_some(conn);
goto done;
}
if (!strcmp(url,"/tor/running-routers")) { /* running-routers fetch */
cached_dir_t *d = dirserv_get_runningrouters();
if (!d) {
write_http_status_line(conn, 503, "Directory unavailable");
goto done;
}
if (d->published < if_modified_since) {
write_http_status_line(conn, 304, "Not modified");
goto done;
}
dlen = compressed ? d->dir_z_len : d->dir_len;
if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
log_info(LD_DIRSERV,
"Client asked for running-routers, but we've been "
"writing too many bytes lately. Sending 503 Dir busy.");
write_http_status_line(conn, 503, "Directory busy, try again later");
goto done;
}
note_request(url, dlen);
write_http_response_header(conn, dlen, compressed,
RUNNINGROUTERS_CACHE_LIFETIME);
connection_write_to_buf(compressed ? d->dir_z : d->dir, dlen,
TO_CONN(conn));
goto done;
}
if (!strcmpstart(url,"/tor/status/")
|| !strcmpstart(url, "/tor/status-vote/current/consensus")) {
/* v2 or v3 network status fetch. */
smartlist_t *dir_fps = smartlist_create();
int is_v3 = !strcmpstart(url, "/tor/status-vote");
const char *request_type = NULL;
const char *key = url + strlen("/tor/status/");
long lifetime = NETWORKSTATUS_CACHE_LIFETIME;
if (!is_v3) {
dirserv_get_networkstatus_v2_fingerprints(dir_fps, key);
if (!strcmpstart(key, "fp/"))
request_type = compressed?"/tor/status/fp.z":"/tor/status/fp";
else if (!strcmpstart(key, "authority"))
request_type = compressed?"/tor/status/authority.z":
"/tor/status/authority";
else if (!strcmpstart(key, "all"))
request_type = compressed?"/tor/status/all.z":"/tor/status/all";
else
request_type = "/tor/status/?";
} else {
networkstatus_t *v = networkstatus_get_latest_consensus();
time_t now = time(NULL);
#define CONSENSUS_URL_PREFIX "/tor/status-vote/current/consensus/"
if (v &&
!strcmpstart(url, CONSENSUS_URL_PREFIX) &&
!client_likes_consensus(v, url + strlen(CONSENSUS_URL_PREFIX))) {
write_http_status_line(conn, 404, "Consensus not signed by sufficient "
"number of requested authorities");
smartlist_free(dir_fps);
goto done;
}
smartlist_add(dir_fps, tor_memdup("\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0", 20));
request_type = compressed?"v3.z":"v3";
lifetime = (v && v->fresh_until > now) ? v->fresh_until - now : 0;
}
if (!smartlist_len(dir_fps)) { /* we failed to create/cache cp */
write_http_status_line(conn, 503, "Network status object unavailable");
smartlist_free(dir_fps);
goto done;
}
if (!dirserv_remove_old_statuses(dir_fps, if_modified_since)) {
write_http_status_line(conn, 404, "Not found");
SMARTLIST_FOREACH(dir_fps, char *, cp, tor_free(cp));
smartlist_free(dir_fps);
goto done;
} else if (!smartlist_len(dir_fps)) {
write_http_status_line(conn, 304, "Not modified");
SMARTLIST_FOREACH(dir_fps, char *, cp, tor_free(cp));
smartlist_free(dir_fps);
goto done;
}
dlen = dirserv_estimate_data_size(dir_fps, 0, compressed);
if (global_write_bucket_low(TO_CONN(conn), dlen, 2)) {
log_debug(LD_DIRSERV,
"Client asked for network status lists, but we've been "
"writing too many bytes lately. Sending 503 Dir busy.");
write_http_status_line(conn, 503, "Directory busy, try again later");
SMARTLIST_FOREACH(dir_fps, char *, fp, tor_free(fp));
smartlist_free(dir_fps);
goto done;
}
#ifdef ENABLE_GEOIP_STATS
{
geoip_client_action_t act =
is_v3 ? GEOIP_CLIENT_NETWORKSTATUS : GEOIP_CLIENT_NETWORKSTATUS_V2;
struct in_addr in;
if (!tor_inet_aton((TO_CONN(conn))->address, &in))
geoip_note_client_seen(act, ntohl(in.s_addr), time(NULL));
}
#endif
// note_request(request_type,dlen);
(void) request_type;
write_http_response_header(conn, -1, compressed,
smartlist_len(dir_fps) == 1 ? lifetime : 0);
conn->fingerprint_stack = dir_fps;
if (! compressed)
conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD);
/* Prime the connection with some data. */
conn->dir_spool_src = DIR_SPOOL_NETWORKSTATUS;
connection_dirserv_flushed_some(conn);
goto done;
}
if (!strcmpstart(url,"/tor/status-vote/current/") ||
!strcmpstart(url,"/tor/status-vote/next/")) {
/* XXXX If-modified-since is only implemented for the current
* consensus: that's probably fine, since it's the only vote document
* people fetch much.*/
int current;
ssize_t body_len = 0;
ssize_t estimated_len = 0;
smartlist_t *items = smartlist_create();
smartlist_t *dir_items = smartlist_create();
int lifetime = 60; /* XXXX022 should actually use vote intervals. */
url += strlen("/tor/status-vote/");
current = !strcmpstart(url, "current/");
url = strchr(url, '/');
tor_assert(url);
++url;
if (!strcmp(url, "consensus")) {
const char *item;
tor_assert(!current); /* we handle current consensus specially above,
* since it wants to be spooled. */
if ((item = dirvote_get_pending_consensus()))
smartlist_add(items, (char*)item);
} else if (!current && !strcmp(url, "consensus-signatures")) {
/* XXXX the spec says that we should implement
* current/consensus-signatures too. It doesn't seem to be needed,
* though. */
const char *item;
if ((item=dirvote_get_pending_detached_signatures()))
smartlist_add(items, (char*)item);
} else if (!strcmp(url, "authority")) {
const cached_dir_t *d;
int flags = DGV_BY_ID |
(current ? DGV_INCLUDE_PREVIOUS : DGV_INCLUDE_PENDING);
if ((d=dirvote_get_vote(NULL, flags)))
smartlist_add(dir_items, (cached_dir_t*)d);
} else {
const cached_dir_t *d;
smartlist_t *fps = smartlist_create();
int flags;
if (!strcmpstart(url, "d/")) {
url += 2;
flags = DGV_INCLUDE_PENDING | DGV_INCLUDE_PREVIOUS;
} else {
flags = DGV_BY_ID |
(current ? DGV_INCLUDE_PREVIOUS : DGV_INCLUDE_PENDING);
}
dir_split_resource_into_fingerprints(url, fps, NULL, 1, 1);
SMARTLIST_FOREACH(fps, char *, fp, {
if ((d = dirvote_get_vote(fp, flags)))
smartlist_add(dir_items, (cached_dir_t*)d);
tor_free(fp);
});
smartlist_free(fps);
}
if (!smartlist_len(dir_items) && !smartlist_len(items)) {
write_http_status_line(conn, 404, "Not found");
goto vote_done;
}
SMARTLIST_FOREACH(dir_items, cached_dir_t *, d,
body_len += compressed ? d->dir_z_len : d->dir_len);
estimated_len += body_len;
SMARTLIST_FOREACH(items, const char *, item, {
size_t ln = strlen(item);
if (compressed) {
estimated_len += ln/2;
} else {
body_len += ln; estimated_len += ln;
}
});
if (global_write_bucket_low(TO_CONN(conn), estimated_len, 1)) {
write_http_status_line(conn, 503, "Directory busy, try again later.");
goto vote_done;
}
write_http_response_header(conn, body_len ? body_len : -1, compressed,
lifetime);
if (smartlist_len(items)) {
if (compressed) {
conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
SMARTLIST_FOREACH(items, const char *, c,
connection_write_to_buf_zlib(c, strlen(c), conn, 0));
connection_write_to_buf_zlib("", 0, conn, 1);
} else {
SMARTLIST_FOREACH(items, const char *, c,
connection_write_to_buf(c, strlen(c), TO_CONN(conn)));
}
} else {
SMARTLIST_FOREACH(dir_items, cached_dir_t *, d,
connection_write_to_buf(compressed ? d->dir_z : d->dir,
compressed ? d->dir_z_len : d->dir_len,
TO_CONN(conn)));
}
vote_done:
smartlist_free(items);
smartlist_free(dir_items);
goto done;
}
if (!strcmpstart(url,"/tor/server/") ||
(!options->BridgeAuthoritativeDir &&
!options->BridgeRelay && !strcmpstart(url,"/tor/extra/"))) {
int res;
const char *msg;
const char *request_type = NULL;
int cache_lifetime = 0;
int is_extra = !strcmpstart(url,"/tor/extra/");
url += is_extra ? strlen("/tor/extra/") : strlen("/tor/server/");
conn->fingerprint_stack = smartlist_create();
res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url,
&msg,
!connection_dir_is_encrypted(conn),
is_extra);
if (!strcmpstart(url, "fp/")) {
request_type = compressed?"/tor/server/fp.z":"/tor/server/fp";
if (smartlist_len(conn->fingerprint_stack) == 1)
cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
} else if (!strcmpstart(url, "authority")) {
request_type = compressed?"/tor/server/authority.z":
"/tor/server/authority";
cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
} else if (!strcmpstart(url, "all")) {
request_type = compressed?"/tor/server/all.z":"/tor/server/all";
cache_lifetime = FULL_DIR_CACHE_LIFETIME;
} else if (!strcmpstart(url, "d/")) {
request_type = compressed?"/tor/server/d.z":"/tor/server/d";
if (smartlist_len(conn->fingerprint_stack) == 1)
cache_lifetime = ROUTERDESC_BY_DIGEST_CACHE_LIFETIME;
} else {
request_type = "/tor/server/?";
}
(void) request_type; /* usable for note_request. */
if (!strcmpstart(url, "d/"))
conn->dir_spool_src =
is_extra ? DIR_SPOOL_EXTRA_BY_DIGEST : DIR_SPOOL_SERVER_BY_DIGEST;
else
conn->dir_spool_src =
is_extra ? DIR_SPOOL_EXTRA_BY_FP : DIR_SPOOL_SERVER_BY_FP;
if (!dirserv_have_any_serverdesc(conn->fingerprint_stack,
conn->dir_spool_src)) {
res = -1;
msg = "Not found";
}
if (res < 0)
write_http_status_line(conn, 404, msg);
else {
dlen = dirserv_estimate_data_size(conn->fingerprint_stack,
1, compressed);
if (global_write_bucket_low(TO_CONN(conn), dlen, 2)) {
log_info(LD_DIRSERV,
"Client asked for server descriptors, but we've been "
"writing too many bytes lately. Sending 503 Dir busy.");
write_http_status_line(conn, 503, "Directory busy, try again later");
conn->dir_spool_src = DIR_SPOOL_NONE;
goto done;
}
write_http_response_header(conn, -1, compressed, cache_lifetime);
if (compressed)
conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
/* Prime the connection with some data. */
connection_dirserv_flushed_some(conn);
}
goto done;
}
if (!strcmpstart(url,"/tor/keys/")) {
smartlist_t *certs = smartlist_create();
ssize_t len = -1;
if (!strcmp(url, "/tor/keys/all")) {
authority_cert_get_all(certs);
} else if (!strcmp(url, "/tor/keys/authority")) {
authority_cert_t *cert = get_my_v3_authority_cert();
if (cert)
smartlist_add(certs, cert);
} else if (!strcmpstart(url, "/tor/keys/fp/")) {
smartlist_t *fps = smartlist_create();
dir_split_resource_into_fingerprints(url+strlen("/tor/keys/fp/"),
fps, NULL, 1, 1);
SMARTLIST_FOREACH(fps, char *, d, {
authority_cert_t *c = authority_cert_get_newest_by_id(d);
if (c) smartlist_add(certs, c);
tor_free(d);
});
smartlist_free(fps);
} else if (!strcmpstart(url, "/tor/keys/sk/")) {
smartlist_t *fps = smartlist_create();
dir_split_resource_into_fingerprints(url+strlen("/tor/keys/sk/"),
fps, NULL, 1, 1);
SMARTLIST_FOREACH(fps, char *, d, {
authority_cert_t *c = authority_cert_get_by_sk_digest(d);
if (c) smartlist_add(certs, c);
tor_free(d);
});
smartlist_free(fps);
} else if (!strcmpstart(url, "/tor/keys/fp-sk/")) {
smartlist_t *fp_sks = smartlist_create();
dir_split_resource_into_fingerprint_pairs(url+strlen("/tor/keys/fp-sk/"),
fp_sks);
SMARTLIST_FOREACH(fp_sks, fp_pair_t *, pair, {
authority_cert_t *c = authority_cert_get_by_digests(pair->first,
pair->second);
if (c) smartlist_add(certs, c);
tor_free(pair);
});
smartlist_free(fp_sks);
} else {
write_http_status_line(conn, 400, "Bad request");
goto keys_done;
}
if (!smartlist_len(certs)) {
write_http_status_line(conn, 404, "Not found");
goto keys_done;
}
SMARTLIST_FOREACH(certs, authority_cert_t *, c,
if (c->cache_info.published_on < if_modified_since)
SMARTLIST_DEL_CURRENT(certs, c));
if (!smartlist_len(certs)) {
write_http_status_line(conn, 304, "Not modified");
goto keys_done;
}
len = 0;
SMARTLIST_FOREACH(certs, authority_cert_t *, c,
len += c->cache_info.signed_descriptor_len);
if (global_write_bucket_low(TO_CONN(conn), compressed?len/2:len, 1)) {
write_http_status_line(conn, 503, "Directory busy, try again later.");
goto keys_done;
}
write_http_response_header(conn, compressed?-1:len, compressed, 60*60);
if (compressed) {
conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
SMARTLIST_FOREACH(certs, authority_cert_t *, c,
connection_write_to_buf_zlib(c->cache_info.signed_descriptor_body,
c->cache_info.signed_descriptor_len,
conn, 0));
connection_write_to_buf_zlib("", 0, conn, 1);
} else {
SMARTLIST_FOREACH(certs, authority_cert_t *, c,
connection_write_to_buf(c->cache_info.signed_descriptor_body,
c->cache_info.signed_descriptor_len,
TO_CONN(conn)));
}
keys_done:
smartlist_free(certs);
goto done;
}
if (options->HidServDirectoryV2 &&
!strcmpstart(url,"/tor/rendezvous2/")) {
/* Handle v2 rendezvous descriptor fetch request. */
const char *descp;
const char *query = url + strlen("/tor/rendezvous2/");
if (strlen(query) == REND_DESC_ID_V2_LEN_BASE32) {
log_info(LD_REND, "Got a v2 rendezvous descriptor request for ID '%s'",
safe_str(query));
switch (rend_cache_lookup_v2_desc_as_dir(query, &descp)) {
case 1: /* valid */
write_http_response_header(conn, strlen(descp), 0, 0);
connection_write_to_buf(descp, strlen(descp), TO_CONN(conn));
break;
case 0: /* well-formed but not present */
write_http_status_line(conn, 404, "Not found");
break;
case -1: /* not well-formed */
write_http_status_line(conn, 400, "Bad request");
break;
}
} else { /* not well-formed */
write_http_status_line(conn, 400, "Bad request");
}
goto done;
}
if (options->HSAuthoritativeDir && !strcmpstart(url,"/tor/rendezvous/")) {
/* rendezvous descriptor fetch */
const char *descp;
size_t desc_len;
const char *query = url+strlen("/tor/rendezvous/");
log_info(LD_REND, "Handling rendezvous descriptor get");
switch (rend_cache_lookup_desc(query, 0, &descp, &desc_len)) {
case 1: /* valid */
write_http_response_header_impl(conn, desc_len,
"application/octet-stream",
NULL, NULL, 0);
note_request("/tor/rendezvous?/", desc_len);
/* need to send descp separately, because it may include nuls */
connection_write_to_buf(descp, desc_len, TO_CONN(conn));
/* report successful fetch to statistic */
if (options->HSAuthorityRecordStats) {
hs_usage_note_fetch_total(query, time(NULL));
hs_usage_note_fetch_successful(query, time(NULL));
}
break;
case 0: /* well-formed but not present */
write_http_status_line(conn, 404, "Not found");
/* report (unsuccessful) fetch to statistic */
if (options->HSAuthorityRecordStats) {
hs_usage_note_fetch_total(query, time(NULL));
}
break;
case -1: /* not well-formed */
write_http_status_line(conn, 400, "Bad request");
break;
}
goto done;
}
if (options->BridgeAuthoritativeDir &&
options->BridgePassword &&
connection_dir_is_encrypted(conn) &&
!strcmp(url,"/tor/networkstatus-bridges")) {
char *status;
char *secret = alloc_http_authenticator(options->BridgePassword);
header = http_get_header(headers, "Authorization: Basic ");
/* now make sure the password is there and right */
if (!header || strcmp(header, secret)) {
write_http_status_line(conn, 404, "Not found");
tor_free(secret);
tor_free(header);
goto done;
}
tor_free(secret);
tor_free(header);
/* all happy now. send an answer. */
status = networkstatus_getinfo_by_purpose("bridge", time(NULL));
dlen = strlen(status);
write_http_response_header(conn, dlen, 0, 0);
connection_write_to_buf(status, dlen, TO_CONN(conn));
tor_free(status);
goto done;
}
if (!strcmpstart(url,"/tor/bytes.txt")) {
char *bytes = directory_dump_request_log();
size_t len = strlen(bytes);
write_http_response_header(conn, len, 0, 0);
connection_write_to_buf(bytes, len, TO_CONN(conn));
tor_free(bytes);
goto done;
}
if (!strcmp(url,"/tor/robots.txt")) { /* /robots.txt will have been
rewritten to /tor/robots.txt */
char robots[] = "User-agent: *\r\nDisallow: /\r\n";
size_t len = strlen(robots);
write_http_response_header(conn, len, 0, ROBOTS_CACHE_LIFETIME);
connection_write_to_buf(robots, len, TO_CONN(conn));
goto done;
}
if (!strcmp(url,"/tor/dbg-stability.txt")) {
const char *stability;
size_t len;
if (! authdir_mode_tests_reachability(options) ||
! (stability = rep_hist_get_router_stability_doc(time(NULL)))) {
write_http_status_line(conn, 404, "Not found.");
goto done;
}
len = strlen(stability);
write_http_response_header(conn, len, 0, 0);
connection_write_to_buf(stability, len, TO_CONN(conn));
goto done;
}
#if defined(EXPORTMALLINFO) && defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO)
#define ADD_MALLINFO_LINE(x) do { \
tor_snprintf(tmp, sizeof(tmp), "%s %d\n", #x, mi.x); \
smartlist_add(lines, tor_strdup(tmp)); \
}while(0);
if (!strcmp(url,"/tor/mallinfo.txt") &&
(tor_addr_eq_ipv4h(&conn->_base.addr, 0x7f000001ul))) {
char *result;
size_t len;
struct mallinfo mi;
smartlist_t *lines;
char tmp[256];
memset(&mi, 0, sizeof(mi));
mi = mallinfo();
lines = smartlist_create();
ADD_MALLINFO_LINE(arena)
ADD_MALLINFO_LINE(ordblks)
ADD_MALLINFO_LINE(smblks)
ADD_MALLINFO_LINE(hblks)
ADD_MALLINFO_LINE(hblkhd)
ADD_MALLINFO_LINE(usmblks)
ADD_MALLINFO_LINE(fsmblks)
ADD_MALLINFO_LINE(uordblks)
ADD_MALLINFO_LINE(fordblks)
ADD_MALLINFO_LINE(keepcost)
result = smartlist_join_strings(lines, "", 0, NULL);
SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
smartlist_free(lines);
len = strlen(result);
write_http_response_header(conn, len, 0, 0);
connection_write_to_buf(result, len, TO_CONN(conn));
tor_free(result);
goto done;
}
#endif
/* we didn't recognize the url */
write_http_status_line(conn, 404, "Not found");
done:
tor_free(url_mem);
return 0;
}
/** Helper function: called when a dirserver gets a complete HTTP POST
* request. Look for an uploaded server descriptor or rendezvous
* service descriptor. On finding one, process it and write a
* response into conn-\>outbuf. If the request is unrecognized, send a
* 400. Always return 0. */
static int
directory_handle_command_post(dir_connection_t *conn, const char *headers,
const char *body, size_t body_len)
{
char *url = NULL;
or_options_t *options = get_options();
log_debug(LD_DIRSERV,"Received POST command.");
conn->_base.state = DIR_CONN_STATE_SERVER_WRITING;
if (parse_http_url(headers, &url) < 0) {
write_http_status_line(conn, 400, "Bad request");
return 0;
}
log_debug(LD_DIRSERV,"rewritten url as '%s'.", url);
/* Handle v2 rendezvous service publish request. */
if (options->HidServDirectoryV2 &&
!strcmpstart(url,"/tor/rendezvous2/publish")) {
switch (rend_cache_store_v2_desc_as_dir(body)) {
case -2:
log_info(LD_REND, "Rejected v2 rend descriptor (length %d) from %s "
"since we're not currently a hidden service directory.",
(int)body_len, conn->_base.address);
write_http_status_line(conn, 503, "Currently not acting as v2 "
"hidden service directory");
break;
case -1:
log_warn(LD_REND, "Rejected v2 rend descriptor (length %d) from %s.",
(int)body_len, conn->_base.address);
write_http_status_line(conn, 400,
"Invalid v2 service descriptor rejected");
break;
default:
write_http_status_line(conn, 200, "Service descriptor (v2) stored");
log_info(LD_REND, "Handled v2 rendezvous descriptor post: accepted");
}
goto done;
}
if (!authdir_mode(options)) {
/* we just provide cached directories; we don't want to
* receive anything. */
write_http_status_line(conn, 400, "Nonauthoritative directory does not "
"accept posted server descriptors");
goto done;
}
if (authdir_mode_handles_descs(options, -1) &&
!strcmp(url,"/tor/")) { /* server descriptor post */
const char *msg = "[None]";
uint8_t purpose = authdir_mode_bridge(options) ?
ROUTER_PURPOSE_BRIDGE : ROUTER_PURPOSE_GENERAL;
was_router_added_t r = dirserv_add_multiple_descriptors(body, purpose,
conn->_base.address, &msg);
tor_assert(msg);
if (WRA_WAS_ADDED(r))
dirserv_get_directory(); /* rebuild and write to disk */
if (r == ROUTER_ADDED_NOTIFY_GENERATOR) {
/* Accepted with a message. */
log_info(LD_DIRSERV,
"Problematic router descriptor or extra-info from %s "
"(\"%s\").",
conn->_base.address, msg);
write_http_status_line(conn, 400, msg);
} else if (r == ROUTER_ADDED_SUCCESSFULLY) {
write_http_status_line(conn, 200, msg);
} else if (WRA_WAS_OUTDATED(r)) {
write_http_response_header_impl(conn, -1, NULL, NULL,
"X-Descriptor-Not-New: Yes\r\n", -1);
} else {
log_info(LD_DIRSERV,
"Rejected router descriptor or extra-info from %s "
"(\"%s\").",
conn->_base.address, msg);
write_http_status_line(conn, 400, msg);
}
goto done;
}
if (options->HSAuthoritativeDir &&
!strcmpstart(url,"/tor/rendezvous/publish")) {
/* rendezvous descriptor post */
log_info(LD_REND, "Handling rendezvous descriptor post.");
if (rend_cache_store(body, body_len, 1) < 0) {
log_fn(LOG_PROTOCOL_WARN, LD_DIRSERV,
"Rejected rend descriptor (length %d) from %s.",
(int)body_len, conn->_base.address);
write_http_status_line(conn, 400,
"Invalid v0 service descriptor rejected");
} else {
write_http_status_line(conn, 200, "Service descriptor (v0) stored");
}
goto done;
}
if (authdir_mode_v3(options) &&
!strcmp(url,"/tor/post/vote")) { /* v3 networkstatus vote */
const char *msg = "OK";
int status;
if (dirvote_add_vote(body, &msg, &status)) {
write_http_status_line(conn, status, "Vote stored");
} else {
tor_assert(msg);
write_http_status_line(conn, status, msg);
}
goto done;
}
if (authdir_mode_v3(options) &&
!strcmp(url,"/tor/post/consensus-signature")) { /* sigs on consensus. */
const char *msg = NULL;
if (dirvote_add_signatures(body, conn->_base.address, &msg)>=0) {
write_http_status_line(conn, 200, msg?msg:"Signatures stored");
} else {
log_warn(LD_DIR, "Unable to store signatures posted by %s: %s",
conn->_base.address, msg?msg:"???");
write_http_status_line(conn, 400, msg?msg:"Unable to store signatures");
}
goto done;
}
/* we didn't recognize the url */
write_http_status_line(conn, 404, "Not found");
done:
tor_free(url);
return 0;
}
/** Called when a dirserver receives data on a directory connection;
* looks for an HTTP request. If the request is complete, remove it
* from the inbuf, try to process it; otherwise, leave it on the
* buffer. Return a 0 on success, or -1 on error.
*/
static int
directory_handle_command(dir_connection_t *conn)
{
char *headers=NULL, *body=NULL;
size_t body_len=0;
int r;
tor_assert(conn);
tor_assert(conn->_base.type == CONN_TYPE_DIR);
switch (fetch_from_buf_http(conn->_base.inbuf,
&headers, MAX_HEADERS_SIZE,
&body, &body_len, MAX_DIR_UL_SIZE, 0)) {
case -1: /* overflow */
log_warn(LD_DIRSERV,
"Invalid input from address '%s'. Closing.",
conn->_base.address);
return -1;
case 0:
log_debug(LD_DIRSERV,"command not all here yet.");
return 0;
/* case 1, fall through */
}
http_set_address_origin(headers, TO_CONN(conn));
//log_debug(LD_DIRSERV,"headers %s, body %s.", headers, body);
if (!strncasecmp(headers,"GET",3))
r = directory_handle_command_get(conn, headers, body, body_len);
else if (!strncasecmp(headers,"POST",4))
r = directory_handle_command_post(conn, headers, body, body_len);
else {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Got headers %s with unknown command. Closing.",
escaped(headers));
r = -1;
}
tor_free(headers); tor_free(body);
return r;
}
/** Write handler for directory connections; called when all data has
* been flushed. Close the connection or wait for a response as
* appropriate.
*/
int
connection_dir_finished_flushing(dir_connection_t *conn)
{
tor_assert(conn);
tor_assert(conn->_base.type == CONN_TYPE_DIR);
switch (conn->_base.state) {
case DIR_CONN_STATE_CLIENT_SENDING:
log_debug(LD_DIR,"client finished sending command.");
conn->_base.state = DIR_CONN_STATE_CLIENT_READING;
connection_stop_writing(TO_CONN(conn));
return 0;
case DIR_CONN_STATE_SERVER_WRITING:
log_debug(LD_DIRSERV,"Finished writing server response. Closing.");
connection_mark_for_close(TO_CONN(conn));
return 0;
default:
log_warn(LD_BUG,"called in unexpected state %d.",
conn->_base.state);
tor_fragile_assert();
return -1;
}
return 0;
}
/** Connected handler for directory connections: begin sending data to the
* server */
int
connection_dir_finished_connecting(dir_connection_t *conn)
{
tor_assert(conn);
tor_assert(conn->_base.type == CONN_TYPE_DIR);
tor_assert(conn->_base.state == DIR_CONN_STATE_CONNECTING);
log_debug(LD_HTTP,"Dir connection to router %s:%u established.",
conn->_base.address,conn->_base.port);
conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */
return 0;
}
/** Called when one or more networkstatus fetches have failed (with uppercase
* fingerprints listed in <b>failed</b>). Mark those fingerprints as having
* failed once, unless they failed with status code 503. */
static void
dir_networkstatus_download_failed(smartlist_t *failed, int status_code)
{
if (status_code == 503)
return;
SMARTLIST_FOREACH(failed, const char *, fp,
{
char digest[DIGEST_LEN];
trusted_dir_server_t *dir;
if (base16_decode(digest, DIGEST_LEN, fp, strlen(fp))<0) {
log_warn(LD_BUG, "Called with bad fingerprint in list: %s",
escaped(fp));
continue;
}
dir = router_get_trusteddirserver_by_digest(digest);
if (dir)
download_status_failed(&dir->v2_ns_dl_status, status_code);
});
}
/** Schedule for when servers should download things in general. */
static const int server_dl_schedule[] = {
0, 0, 0, 60, 60, 60*2, 60*5, 60*15, INT_MAX
};
/** Schedule for when clients should download things in general. */
static const int client_dl_schedule[] = {
0, 0, 60, 60*5, 60*10, INT_MAX
};
/** Schedule for when servers should download consensuses. */
static const int server_consensus_dl_schedule[] = {
0, 0, 60, 60*5, 60*10, 60*30, 60*30, 60*30, 60*30, 60*30, 60*60, 60*60*2
};
/** Schedule for when clients should download consensuses. */
static const int client_consensus_dl_schedule[] = {
0, 0, 60, 60*5, 60*10, 60*30, 60*60, 60*60, 60*60, 60*60*3, 60*60*6, 60*60*12
};
/** Schedule for when clients should download bridge descriptors. */
static const int bridge_dl_schedule[] = {
60*60, 15*60, 15*60, 60*60
};
/** Decide which download schedule we want to use, and then return a
* pointer to it along with a pointer to its length. Helper function for
* download_status_increment_failure() and download_status_reset(). */
static void
find_dl_schedule_and_len(download_status_t *dls, int server,
const int **schedule, size_t *schedule_len)
{
switch (dls->schedule) {
case DL_SCHED_GENERIC:
if (server) {
*schedule = server_dl_schedule;
*schedule_len = sizeof(server_dl_schedule)/sizeof(int);
} else {
*schedule = client_dl_schedule;
*schedule_len = sizeof(client_dl_schedule)/sizeof(int);
}
break;
case DL_SCHED_CONSENSUS:
if (server) {
*schedule = server_consensus_dl_schedule;
*schedule_len = sizeof(server_consensus_dl_schedule)/sizeof(int);
} else {
*schedule = client_consensus_dl_schedule;
*schedule_len = sizeof(client_consensus_dl_schedule)/sizeof(int);
}
break;
case DL_SCHED_BRIDGE:
*schedule = bridge_dl_schedule;
*schedule_len = sizeof(bridge_dl_schedule)/sizeof(int);
break;
default:
tor_assert(0);
}
}
/** Called when an attempt to download <b>dls</b> has failed with HTTP status
* <b>status_code</b>. Increment the failure count (if the code indicates a
* real failure) and set <b>dls</b>-\>next_attempt_at to an appropriate time
* in the future. */
time_t
download_status_increment_failure(download_status_t *dls, int status_code,
const char *item, int server, time_t now)
{
const int *schedule;
size_t schedule_len;
int increment;
tor_assert(dls);
if (status_code != 503 || server) {
if (dls->n_download_failures < IMPOSSIBLE_TO_DOWNLOAD-1)
++dls->n_download_failures;
}
find_dl_schedule_and_len(dls, server, &schedule, &schedule_len);
if (dls->n_download_failures < schedule_len)
increment = schedule[dls->n_download_failures];
else if (dls->n_download_failures == IMPOSSIBLE_TO_DOWNLOAD)
increment = INT_MAX;
else
increment = schedule[schedule_len-1];
if (increment < INT_MAX)
dls->next_attempt_at = now+increment;
else
dls->next_attempt_at = TIME_MAX;
if (item) {
if (increment == 0)
log_debug(LD_DIR, "%s failed %d time(s); I'll try again immediately.",
item, (int)dls->n_download_failures);
else if (dls->next_attempt_at < TIME_MAX)
log_debug(LD_DIR, "%s failed %d time(s); I'll try again in %d seconds.",
item, (int)dls->n_download_failures,
(int)(dls->next_attempt_at-now));
else
log_debug(LD_DIR, "%s failed %d time(s); Giving up for a while.",
item, (int)dls->n_download_failures);
}
return dls->next_attempt_at;
}
/** Reset <b>dls</b> so that it will be considered downloadable
* immediately, and/or to show that we don't need it anymore.
*
* (We find the zeroth element of the download schedule, and set
* next_attempt_at to be the appropriate offset from 'now'. In most
* cases this means setting it to 'now', so the item will be immediately
* downloadable; in the case of bridge descriptors, the zeroth element
* is an hour from now.) */
void
download_status_reset(download_status_t *dls)
{
const int *schedule;
size_t schedule_len;
find_dl_schedule_and_len(dls, get_options()->DirPort,
&schedule, &schedule_len);
dls->n_download_failures = 0;
dls->next_attempt_at = time(NULL) + schedule[0];
}
/** Called when one or more routerdesc (or extrainfo, if <b>was_extrainfo</b>)
* fetches have failed (with uppercase fingerprints listed in <b>failed</b>,
* either as descriptor digests or as identity digests based on
* <b>was_descriptor_digests</b>).
*/
static void
dir_routerdesc_download_failed(smartlist_t *failed, int status_code,
int router_purpose,
int was_extrainfo, int was_descriptor_digests)
{
char digest[DIGEST_LEN];
time_t now = time(NULL);
int server = directory_fetches_from_authorities(get_options());
if (!was_descriptor_digests) {
if (router_purpose == ROUTER_PURPOSE_BRIDGE) {
tor_assert(!was_extrainfo); /* not supported yet */
SMARTLIST_FOREACH(failed, const char *, cp,
{
if (base16_decode(digest, DIGEST_LEN, cp, strlen(cp))<0) {
log_warn(LD_BUG, "Malformed fingerprint in list: %s",
escaped(cp));
continue;
}
retry_bridge_descriptor_fetch_directly(digest);
});
}
return; /* FFFF should implement for other-than-router-purpose someday */
}
SMARTLIST_FOREACH(failed, const char *, cp,
{
download_status_t *dls = NULL;
if (base16_decode(digest, DIGEST_LEN, cp, strlen(cp)) < 0) {
log_warn(LD_BUG, "Malformed fingerprint in list: %s", escaped(cp));
continue;
}
if (was_extrainfo) {
signed_descriptor_t *sd =
router_get_by_extrainfo_digest(digest);
if (sd)
dls = &sd->ei_dl_status;
} else {
dls = router_get_dl_status_by_descriptor_digest(digest);
}
if (!dls || dls->n_download_failures >= MAX_ROUTERDESC_DOWNLOAD_FAILURES)
continue;
download_status_increment_failure(dls, status_code, cp, server, now);
});
/* No need to relaunch descriptor downloads here: we already do it
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
}
/** Helper. Compare two fp_pair_t objects, and return -1, 0, or 1 as
* appropriate. */
static int
_compare_pairs(const void **a, const void **b)
{
const fp_pair_t *fp1 = *a, *fp2 = *b;
int r;
if ((r = memcmp(fp1->first, fp2->first, DIGEST_LEN)))
return r;
else
return memcmp(fp1->second, fp2->second, DIGEST_LEN);
}
/** Divide a string <b>res</b> of the form FP1-FP2+FP3-FP4...[.z], where each
* FP is a hex-encoded fingerprint, into a sequence of distinct sorted
* fp_pair_t. Skip malformed pairs. On success, return 0 and add those
* fp_pair_t into <b>pairs_out</b>. On failure, return -1. */
int
dir_split_resource_into_fingerprint_pairs(const char *res,
smartlist_t *pairs_out)
{
smartlist_t *pairs_tmp = smartlist_create();
smartlist_t *pairs_result = smartlist_create();
smartlist_split_string(pairs_tmp, res, "+", 0, 0);
if (smartlist_len(pairs_tmp)) {
char *last = smartlist_get(pairs_tmp,smartlist_len(pairs_tmp)-1);
size_t last_len = strlen(last);
if (last_len > 2 && !strcmp(last+last_len-2, ".z")) {
last[last_len-2] = '\0';
}
}
SMARTLIST_FOREACH_BEGIN(pairs_tmp, char *, cp) {
if (strlen(cp) != HEX_DIGEST_LEN*2+1) {
log_info(LD_DIR,
"Skipping digest pair %s with non-standard length.", escaped(cp));
} else if (cp[HEX_DIGEST_LEN] != '-') {
log_info(LD_DIR,
"Skipping digest pair %s with missing dash.", escaped(cp));
} else {
fp_pair_t pair;
if (base16_decode(pair.first, DIGEST_LEN, cp, HEX_DIGEST_LEN)<0 ||
base16_decode(pair.second,
DIGEST_LEN, cp+HEX_DIGEST_LEN+1, HEX_DIGEST_LEN)<0) {
log_info(LD_DIR, "Skipping non-decodable digest pair %s", escaped(cp));
} else {
smartlist_add(pairs_result, tor_memdup(&pair, sizeof(pair)));
}
}
tor_free(cp);
} SMARTLIST_FOREACH_END(cp);
smartlist_free(pairs_tmp);
/* Uniq-and-sort */
smartlist_sort(pairs_result, _compare_pairs);
smartlist_uniq(pairs_result, _compare_pairs, _tor_free);
smartlist_add_all(pairs_out, pairs_result);
smartlist_free(pairs_result);
return 0;
}
/** Given a directory <b>resource</b> request, containing zero
* or more strings separated by plus signs, followed optionally by ".z", store
* the strings, in order, into <b>fp_out</b>. If <b>compressed_out</b> is
* non-NULL, set it to 1 if the resource ends in ".z", else set it to 0. If
* decode_hex is true, then delete all elements that aren't hex digests, and
* decode the rest. If sort_uniq is true, then sort the list and remove
* all duplicates.
*/
int
dir_split_resource_into_fingerprints(const char *resource,
smartlist_t *fp_out, int *compressed_out,
int decode_hex, int sort_uniq)
{
smartlist_t *fp_tmp = smartlist_create();
tor_assert(fp_out);
smartlist_split_string(fp_tmp, resource, "+", 0, 0);
if (compressed_out)
*compressed_out = 0;
if (smartlist_len(fp_tmp)) {
char *last = smartlist_get(fp_tmp,smartlist_len(fp_tmp)-1);
size_t last_len = strlen(last);
if (last_len > 2 && !strcmp(last+last_len-2, ".z")) {
last[last_len-2] = '\0';
if (compressed_out)
*compressed_out = 1;
}
}
if (decode_hex) {
int i;
char *cp, *d = NULL;
for (i = 0; i < smartlist_len(fp_tmp); ++i) {
cp = smartlist_get(fp_tmp, i);
if (strlen(cp) != HEX_DIGEST_LEN) {
log_info(LD_DIR,
"Skipping digest %s with non-standard length.", escaped(cp));
smartlist_del_keeporder(fp_tmp, i--);
goto again;
}
d = tor_malloc_zero(DIGEST_LEN);
if (base16_decode(d, DIGEST_LEN, cp, HEX_DIGEST_LEN)<0) {
log_info(LD_DIR, "Skipping non-decodable digest %s", escaped(cp));
smartlist_del_keeporder(fp_tmp, i--);
goto again;
}
smartlist_set(fp_tmp, i, d);
d = NULL;
again:
tor_free(cp);
tor_free(d);
}
}
if (sort_uniq) {
smartlist_t *fp_tmp2 = smartlist_create();
int i;
if (decode_hex)
smartlist_sort_digests(fp_tmp);
else
smartlist_sort_strings(fp_tmp);
if (smartlist_len(fp_tmp))
smartlist_add(fp_tmp2, smartlist_get(fp_tmp, 0));
for (i = 1; i < smartlist_len(fp_tmp); ++i) {
char *cp = smartlist_get(fp_tmp, i);
char *last = smartlist_get(fp_tmp2, smartlist_len(fp_tmp2)-1);
if ((decode_hex && memcmp(cp, last, DIGEST_LEN))
|| (!decode_hex && strcasecmp(cp, last)))
smartlist_add(fp_tmp2, cp);
else
tor_free(cp);
}
smartlist_free(fp_tmp);
fp_tmp = fp_tmp2;
}
smartlist_add_all(fp_out, fp_tmp);
smartlist_free(fp_tmp);
return 0;
}
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