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tor/src/or/directory.c
Nick Mathewson 210beff55a r13266@catbus: nickm | 2007-06-05 16:38:08 -0400 
Patch from peter palfrader: control interface via unix domain socket


svn:r10504
2007-06-05 20:54:49 +00:00

2302 lines
82 KiB
C
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/* Copyright 2001-2004 Roger Dingledine.
* Copyright 2004-2007 Roger Dingledine, Nick Mathewson. */
/* See LICENSE for licensing information */
/* $Id$ */
const char directory_c_id[] =
"$Id$";
#include "or.h"
/**
* \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);
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 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 dir_networkstatus_download_failed(smartlist_t *failed,
int status_code);
static void dir_routerdesc_download_failed(smartlist_t *failed,
int status_code,
int was_extrainfo);
static void note_request(const char *key, size_t bytes);
/********* 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 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 purpose)
{
if (get_options()->AllDirActionsPrivate)
return 1;
if (purpose == DIR_PURPOSE_FETCH_DIR ||
purpose == DIR_PURPOSE_UPLOAD_DIR ||
purpose == DIR_PURPOSE_FETCH_RUNNING_LIST ||
purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS ||
purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
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 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);
local_routerstatus_t *lrs;
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) {
lrs = router_get_combined_status_by_digest(identity_digest);
if (lrs && lrs->status.version_supports_extrainfo_upload)
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 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(dirservers, trusted_dir_server_t *, ds,
{
routerstatus_t *rs = &(ds->fake_status.status);
size_t upload_len = payload_len;
if ((type & ds->type) == 0)
continue;
found = 1; /* at least one authority of this type was listed */
if (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);
}
post_via_tor = purpose_needs_anonymity(purpose) ||
!fascist_firewall_allows_address_dir(ds->addr, ds->dir_port);
directory_initiate_command_routerstatus(rs, purpose, post_via_tor,
NULL, payload, upload_len);
});
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 'purpose' and requesting 'resource'.
* If <b>retry_if_no_servers</b>, then if all the possible servers seem
* down, mark them up and try again.
*/
void
directory_get_from_dirserver(uint8_t purpose, const char *resource,
int retry_if_no_servers)
{
routerstatus_t *rs = NULL;
or_options_t *options = get_options();
int prefer_authority = server_mode(options) && options->DirPort != 0;
int directconn = !purpose_needs_anonymity(purpose);
authority_type_t type;
/* FFFF we could break this switch into its own function, and call
* it elsewhere in directory.c. -RD */
switch (purpose) {
case DIR_PURPOSE_FETCH_EXTRAINFO:
type = EXTRAINFO_CACHE | V2_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_NETWORKSTATUS:
case DIR_PURPOSE_FETCH_SERVERDESC:
type = V2_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_DIR:
case DIR_PURPOSE_FETCH_RUNNING_LIST:
type = V1_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_RENDDESC:
type = HIDSERV_AUTHORITY;
break;
default:
log_warn(LD_BUG, "Unexpected purpose %d", (int)purpose);
return;
}
if (!options->FetchServerDescriptors && type != HIDSERV_AUTHORITY)
return;
if (directconn) {
if (prefer_authority) {
/* only ask authdirservers, and don't ask myself */
rs = router_pick_trusteddirserver(type, 1, 1,
retry_if_no_servers);
}
if (!rs) {
/* anybody with a non-zero dirport will do */
rs = router_pick_directory_server(1, 1, type,
retry_if_no_servers);
if (!rs) {
const char *which;
if (purpose == DIR_PURPOSE_FETCH_DIR)
which = "directory";
else if (purpose == DIR_PURPOSE_FETCH_RUNNING_LIST)
which = "status list";
else if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS)
which = "network status";
else // if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS)
which = "server descriptors";
log_info(LD_DIR,
"No router found for %s; falling back to dirserver list",
which);
rs = router_pick_trusteddirserver(type, 1, 1,
retry_if_no_servers);
if (!rs)
directconn = 0; /* last resort: try routing it via Tor */
}
}
}
if (!directconn) {
/* Never use fascistfirewall; we're going via Tor. */
if (purpose == DIR_PURPOSE_FETCH_RENDDESC) {
/* only ask hidserv authorities, any of them will do */
rs = router_pick_trusteddirserver(HIDSERV_AUTHORITY, 0, 0,
retry_if_no_servers);
} else {
/* anybody with a non-zero dirport will do. Disregard firewalls. */
rs = router_pick_directory_server(1, 0, type,
retry_if_no_servers);
/* 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, purpose, !directconn,
resource, NULL, 0);
else {
log_notice(LD_DIR,
"While fetching directory info, "
"no running dirservers known. Will try again later. "
"(purpose %d)", purpose);
if (!purpose_needs_anonymity(purpose)) {
/* remember we tried them all and failed. */
directory_all_unreachable(time(NULL));
}
}
}
/** Launch a new connection to the directory server <b>status</b> to upload or
* download a server or rendezvous descriptor. <b>purpose</b> determines what
* kind of directory connection we're launching, and must be one of
* DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC}.
*
* 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 purpose,
int anonymized_connection,
const char *resource,
const char *payload,
size_t payload_len)
{
routerinfo_t *router;
char address_buf[INET_NTOA_BUF_LEN+1];
struct in_addr in;
const char *address;
if ((router = router_get_by_digest(status->identity_digest))) {
address = router->address;
} else {
in.s_addr = htonl(status->addr);
tor_inet_ntoa(&in, address_buf, sizeof(address_buf));
address = address_buf;
}
directory_initiate_command(address, status->addr,
status->or_port, status->dir_port,
status->version_supports_begindir,
status->identity_digest,
purpose, anonymized_connection, resource,
payload, payload_len);
}
/** 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) &&
me->addr == conn->_base.addr &&
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. */
}
router_set_status(conn->identity_digest, 0); /* don't try him again */
if (conn->_base.purpose == DIR_PURPOSE_FETCH_DIR ||
conn->_base.purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
log_info(LD_DIR, "Giving up on directory server at '%s:%d'; retrying",
conn->_base.address, conn->_base.port);
directory_get_from_dirserver(conn->_base.purpose, NULL,
0 /* don't retry_if_no_servers */);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_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);
}
}
/** 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,
++ds->n_networkstatus_failures);
directory_get_from_dirserver(conn->_base.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 seconds (DESCRIPTOR_RETRY_INTERVAL) in main.c. */
tor_assert(conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
(void) conn;
}
/** Helper for directory_initiate_command_(router|trusted_dir): 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, uint32_t addr,
uint16_t or_port, uint16_t dir_port,
int supports_begindir,
const char *digest, uint8_t purpose,
int anonymized_connection, const char *resource,
const char *payload, size_t payload_len)
{
dir_connection_t *conn;
or_options_t *options = get_options();
int want_to_tunnel = options->TunnelDirConns && supports_begindir &&
!anonymized_connection && or_port &&
fascist_firewall_allows_address_or(addr, or_port);
tor_assert(address);
tor_assert(addr);
tor_assert(dir_port);
tor_assert(digest);
log_debug(LD_DIR, "anonymized %d, want_to_tunnel %d.",
anonymized_connection, want_to_tunnel);
switch (purpose) {
case DIR_PURPOSE_FETCH_DIR:
log_debug(LD_DIR,"initiating directory fetch");
break;
case DIR_PURPOSE_FETCH_RENDDESC:
log_debug(LD_DIR,"initiating hidden-service descriptor fetch");
break;
case DIR_PURPOSE_UPLOAD_DIR:
log_debug(LD_OR,"initiating server descriptor upload");
break;
case DIR_PURPOSE_UPLOAD_RENDDESC:
log_debug(LD_REND,"initiating hidden-service descriptor upload");
break;
case DIR_PURPOSE_FETCH_RUNNING_LIST:
log_debug(LD_DIR,"initiating running-routers fetch");
break;
case DIR_PURPOSE_FETCH_NETWORKSTATUS:
log_debug(LD_DIR,"initiating network-status fetch");
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
log_debug(LD_DIR,"initiating server descriptor fetch");
break;
case DIR_PURPOSE_FETCH_EXTRAINFO:
log_debug(LD_DIR,"initiating extra-info fetch");
break;
default:
log_err(LD_BUG, "Unrecognized directory connection purpose.");
tor_assert(0);
}
conn = TO_DIR_CONN(connection_new(CONN_TYPE_DIR, AF_INET));
/* set up conn so it's got all the data we need to remember */
conn->_base.addr = addr;
conn->_base.port = want_to_tunnel ? or_port : dir_port;
conn->_base.address = tor_strdup(address);
memcpy(conn->identity_digest, digest, DIGEST_LEN);
conn->_base.purpose = purpose;
/* give it an initial state */
conn->_base.state = DIR_CONN_STATE_CONNECTING;
if (!anonymized_connection && !want_to_tunnel) {
/* then we want to connect directly */
conn->dirconn_direct = 1;
if (options->HttpProxy) {
addr = options->HttpProxyAddr;
dir_port = options->HttpProxyPort;
}
switch (connection_connect(TO_CONN(conn), conn->_base.address, addr,
dir_port)) {
case -1:
connection_dir_request_failed(conn); /* retry if we want */
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, purpose, 1, resource,
payload, payload_len);
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 tor */
edge_connection_t *linked_conn;
/* make an AP connection
* populate it and add it at the right state
* hook up both sides
*/
conn->dirconn_direct = 0;
linked_conn =
connection_ap_make_bridge(conn->_base.address, conn->_base.port,
digest,
anonymized_connection ?
SOCKS_COMMAND_CONNECT :
SOCKS_COMMAND_CONNECT_DIR);
if (!linked_conn) {
log_warn(LD_NET,"Making AP bridge 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 AP bridge 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, purpose, 0, resource,
payload, payload_len);
connection_watch_events(TO_CONN(conn), EV_READ | EV_WRITE);
connection_start_reading(TO_CONN(linked_conn));
}
}
/** 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)
{
char proxystring[256];
char proxyauthstring[256];
char hoststring[128];
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);
}
/* 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_DIR:
tor_assert(!resource);
tor_assert(!payload);
httpcommand = "GET";
url = tor_strdup("/tor/dir.z");
break;
case DIR_PURPOSE_FETCH_RUNNING_LIST:
tor_assert(!resource);
tor_assert(!payload);
httpcommand = "GET";
url = tor_strdup("/tor/running-routers");
break;
case DIR_PURPOSE_FETCH_NETWORKSTATUS:
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/status/%s", resource);
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
httpcommand = "GET";
len = strlen(resource)+32;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/server/%s", resource);
break;
case DIR_PURPOSE_FETCH_EXTRAINFO:
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_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);
/* This breaks the function abstraction. */
strlcpy(conn->rend_query, resource, sizeof(conn->rend_query));
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_UPLOAD_RENDDESC:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/rendezvous/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\r\n\r\n",
hoststring,
proxyauthstring);
} else {
tor_snprintf(request, sizeof(request),
" HTTP/1.0\r\nContent-Length: %lu\r\nHost: %s%s\r\n\r\n",
payload ? (unsigned long)payload_len : 0,
hoststring,
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 (!strcmpstart(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;
}
}
/** We are a client, and we've finished reading the server's
* response. Parse and 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;
int 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);
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 (abs(delta)>ALLOW_DIRECTORY_TIME_SKEW) {
int trusted = router_digest_is_trusted_dir(conn->identity_digest);
log_fn(trusted ? LOG_WARN : LOG_INFO,
LD_HTTP,
"Received directory with skewed time (server '%s:%d'): "
"we are %d minutes %s, or the directory is %d minutes %s.",
conn->_base.address, conn->_base.port,
abs(delta)/60, delta>0 ? "ahead" : "behind",
abs(delta)/60, 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=%d 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 %d seconds skewed. (That's okay.)", delta);
}
}
(void) skewed; /* skewed isn't used yet. */
if (status_code == 503) {
local_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_combined_status_by_digest(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;
}
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_DIR) {
/* fetch/process the directory to cache it. */
log_info(LD_DIR,"Received directory (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 directory. I'll try again soon.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
if (router_parse_directory(body) < 0) {
log_notice(LD_DIR,"I failed to parse the directory I fetched from "
"'%s:%d'. Ignoring.", conn->_base.address, conn->_base.port);
}
note_request(was_compressed?"dl/dir.z":"dl/dir", orig_len);
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
/* just update our list of running routers, if this list is new info */
log_info(LD_DIR,"Received running-routers list (size %d)", (int)body_len);
if (status_code != 200) {
log_warn(LD_DIR,"Received http status code %d (%s) from server "
"'%s:%d' while fetching running-routers. I'll try again soon.",
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
if (router_parse_runningrouters(body)<0) {
log_warn(LD_DIR,
"Bad running-routers from server '%s:%d'. I'll try again soon.",
conn->_base.address, conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
return -1;
}
note_request(was_compressed?"dl/running-routers.z":
"dl/running-routers", orig_len);
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) {
smartlist_t *which = NULL;
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) {
/* XXXX020 This warning tends to freak out clients who get a 403. */
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;
}
note_request(was_compressed?"dl/status.z":"dl/status", orig_len);
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 {
/* 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(cp, now, source, which)<0)
break;
if (next) {
next[1] = 'n';
cp = next+1;
} else
break;
}
routers_update_all_from_networkstatus(now); /*launches router downloads*/
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_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;
log_info(LD_DIR,"Received %s (size %d) from server '%s:%d'",
was_ei ? "server info" : "extra server info",
(int)body_len, conn->_base.address, conn->_base.port);
if (was_ei)
note_request(was_compressed?"dl/extra.z":"dl/extra", orig_len);
else
note_request(was_compressed?"dl/server.z":"dl/server", orig_len);
if (conn->requested_resource &&
!strcmpstart(conn->requested_resource,"d/")) {
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+2,
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. */
/* XXXX020 This warning tends to freak out clients who get a 403. */
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, was_ei);
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".
* Right now, we only use "authority" to fetch ourself, so we don't want
* to risk replacing ourself with a router running at the addr:port we
* think we have.
*/
if (which || (conn->requested_resource &&
!strcmpstart(conn->requested_resource, "all"))) {
/* as we learn from them, we remove them from 'which' */
if (was_ei) {
router_load_extrainfo_from_string(body, NULL, SAVED_NOWHERE, which);
} else {
router_load_routers_from_string(body, NULL, SAVED_NOWHERE, which);
directory_info_has_arrived(now, 0);
}
}
if (which) { /* mark remaining ones as failed */
log_info(LD_DIR, "Received %d/%d routers requested from %s:%d",
n_asked_for-smartlist_len(which), n_asked_for,
conn->_base.address, (int)conn->_base.port);
if (smartlist_len(which)) {
dir_routerdesc_download_failed(which, status_code, was_ei);
}
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: {
int all_done = 1;
trusted_dir_server_t *ds =
router_get_trusteddirserver_by_digest(conn->identity_digest);
smartlist_t *servers;
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;
servers = router_get_trusted_dir_servers();
SMARTLIST_FOREACH(servers, trusted_dir_server_t *, d, {
if ((d->type & (V1_AUTHORITY|V2_AUTHORITY)) &&
!d->has_accepted_serverdesc) {
all_done = 0;
break;
}
});
if (all_done)
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;
case 403:
log_warn(LD_GENERAL,
"http status 403 (%s) response from dirserver "
"'%s:%d'. Is your clock skewed? Have you mailed us your key "
"fingerprint? Are you using the right key? Are you using a "
"private IP address? See http://tor.eff.org/doc/"
"tor-doc-server.html",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_FETCH_RENDDESC) {
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) < 0) {
log_warn(LD_REND,"Failed to store rendezvous descriptor.");
/* alice's ap_stream will notice when connection_mark_for_close
* cleans it up */
} else {
/* success. notify pending connections about this. */
conn->_base.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
rend_client_desc_here(conn->rend_query);
}
break;
case 404:
/* not there. pending connections will be notified when
* connection_mark_for_close cleans it 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_UPLOAD_RENDDESC) {
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;
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;
}
}
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(dir_connection_t *conn, ssize_t length,
const char *type, const char *encoding,
int cache_lifetime)
{
char date[RFC1123_TIME_LEN+1];
char tmp[1024];
char *cp;
time_t now = time(NULL);
tor_assert(conn);
tor_assert(type);
format_rfc1123_time(date, now);
cp = tmp;
tor_snprintf(cp, sizeof(tmp),
"HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Type: %s\r\n",
date, type);
cp += strlen(tmp);
if (!is_internal_IP(conn->_base.addr, 0)) {
/* Don't report the source address for a localhost/private connection. */
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 {
/* 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 (sizeof(tmp)-(cp-tmp) > 3)
memcpy(cp, "\r\n", 3);
else
tor_assert(0);
connection_write_to_buf(tmp, strlen(tmp), TO_CONN(conn));
}
/** Helper function: return 1 if there are any dir conns of purpose
* <b>purpose</b> that are going elsewhere than our own ORPort/Dirport.
* Else return 0.
*/
static int
already_fetching_directory(int purpose)
{
smartlist_t *conns = get_connection_array();
SMARTLIST_FOREACH(conns, connection_t *, conn,
{
if (conn->type == CONN_TYPE_DIR &&
conn->purpose == purpose &&
!conn->marked_for_close &&
!router_digest_is_me(TO_DIR_CONN(conn)->identity_digest))
return 1;
});
return 0;
}
#undef INSTRUMENT_DOWNLOADS
#ifdef INSTRUMENT_DOWNLOADS
/** 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 uint64_t. */
static strmap_t *request_bytes_map = NULL;
/** 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. */
static void
note_request(const char *key, size_t bytes)
{
uint64_t *n;
if (!request_bytes_map)
request_bytes_map = strmap_new();
n = strmap_get(request_bytes_map, key);
if (!n) {
n = tor_malloc_zero(sizeof(uint64_t));
strmap_set(request_bytes_map, key, n);
}
*n += bytes;
}
/** 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;
if (!request_bytes_map)
request_bytes_map = strmap_new();
lines = smartlist_create();
for (iter = strmap_iter_init(request_bytes_map);
!strmap_iter_done(iter);
iter = strmap_iter_next(request_bytes_map, iter)) {
const char *key;
void *val;
uint64_t *n;
strmap_iter_get(iter, &key, &val);
n = val;
tor_snprintf(tmp, sizeof(tmp), "%s "U64_FORMAT"\n",
key, U64_PRINTF_ARG(*n));
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_request(const char *key, size_t bytes)
{
(void)key;
(void)bytes;
}
char *
directory_dump_request_log(void)
{
return tor_strdup("Not supported.");
}
#endif
/** 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 = NULL;
or_options_t *options = get_options();
time_t if_modified_since = 0;
char *header;
/* 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);
if (!strcmp(url,"/tor/") || !strcmp(url,"/tor/dir.z")) { /* dir fetch */
int deflated = !strcmp(url,"/tor/dir.z");
cached_dir_t *d = dirserv_get_directory();
if (!d) {
log_notice(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");
/* try to get a new one now */
if (!already_fetching_directory(DIR_PURPOSE_FETCH_DIR))
directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1);
tor_free(url);
return 0;
}
if (d->published < if_modified_since) {
write_http_status_line(conn, 304, "Not modified");
tor_free(url);
return 0;
}
dlen = deflated ? d->dir_z_len : d->dir_len;
if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
log_info(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");
tor_free(url);
return 0;
}
note_request(url, dlen);
tor_free(url);
log_debug(LD_DIRSERV,"Dumping %sdirectory to client.",
deflated?"deflated ":"");
write_http_response_header(conn, dlen,
deflated?"application/octet-stream":"text/plain",
deflated?"deflate":"identity",
FULL_DIR_CACHE_LIFETIME);
conn->cached_dir = d;
conn->cached_dir_offset = 0;
if (! deflated)
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);
return 0;
}
if (!strcmp(url,"/tor/running-routers") ||
!strcmp(url,"/tor/running-routers.z")) { /* running-routers fetch */
int deflated = !strcmp(url,"/tor/running-routers.z");
cached_dir_t *d = dirserv_get_runningrouters();
if (!d) {
write_http_status_line(conn, 503, "Directory unavailable");
/* try to get a new one now */
if (!already_fetching_directory(DIR_PURPOSE_FETCH_RUNNING_LIST))
directory_get_from_dirserver(DIR_PURPOSE_FETCH_RUNNING_LIST, NULL, 1);
tor_free(url);
return 0;
}
if (d->published < if_modified_since) {
write_http_status_line(conn, 304, "Not modified");
tor_free(url);
return 0;
}
dlen = deflated ? 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");
tor_free(url);
return 0;
}
note_request(url, dlen);
tor_free(url);
write_http_response_header(conn, dlen,
deflated?"application/octet-stream":"text/plain",
deflated?"deflate":"identity",
RUNNINGROUTERS_CACHE_LIFETIME);
connection_write_to_buf(deflated ? d->dir_z : d->dir, dlen, TO_CONN(conn));
return 0;
}
if (!strcmpstart(url,"/tor/status/")) {
/* v2 network status fetch. */
size_t url_len = strlen(url);
int deflated = !strcmp(url+url_len-2, ".z");
smartlist_t *dir_fps = smartlist_create();
const char *request_type = NULL;
const char *key = url + strlen("/tor/status/");
if (deflated)
url[url_len-2] = '\0';
dirserv_get_networkstatus_v2_fingerprints(dir_fps, key);
if (!strcmpstart(key, "fp/"))
request_type = deflated?"/tor/status/fp.z":"/tor/status/fp";
else if (!strcmpstart(key, "authority"))
request_type = deflated?"/tor/status/authority.z":
"/tor/status/authority";
else if (!strcmpstart(key, "all"))
request_type = deflated?"/tor/status/all.z":"/tor/status/all";
else
request_type = "/tor/status/?";
tor_free(url);
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);
return 0;
}
if (dirserv_statuses_are_old(dir_fps, if_modified_since)) {
write_http_status_line(conn, 304, "Not modified");
smartlist_free(dir_fps);
return 0;
}
dlen = dirserv_estimate_data_size(dir_fps, 0, deflated);
if (global_write_bucket_low(TO_CONN(conn), dlen, 2)) {
log_info(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);
return 0;
}
// note_request(request_type,dlen);
(void) request_type;
write_http_response_header(conn, -1,
deflated?"application/octet_stream":"text/plain",
deflated?"deflate":NULL,
smartlist_len(dir_fps) == 1 ? NETWORKSTATUS_CACHE_LIFETIME:0);
conn->fingerprint_stack = dir_fps;
if (! deflated)
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);
return 0;
}
if (!strcmpstart(url,"/tor/server/") ||
!strcmpstart(url,"/tor/extra/")) {
char *url_mem = url;
size_t url_len = strlen(url);
int deflated = !strcmp(url+url_len-2, ".z");
int res;
const char *msg;
const char *request_type = NULL;
int cache_lifetime = 0;
int is_extra = !strcmpstart(url,"/tor/extra/");
if (deflated)
url[url_len-2] = '\0';
url += is_extra ? strlen("/tor/extra/") : strlen("/tor/server/");
conn->fingerprint_stack = smartlist_create();
res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url,
&msg);
if (!strcmpstart(url, "fp/")) {
request_type = deflated?"/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 = deflated?"/tor/server/authority.z":
"/tor/server/authority";
cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
} else if (!strcmpstart(url, "all")) {
request_type = deflated?"/tor/server/all.z":"/tor/server/all";
cache_lifetime = FULL_DIR_CACHE_LIFETIME;
} else if (!strcmpstart(url, "d/")) {
request_type = deflated?"/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;
tor_free(url_mem);
if (res < 0)
write_http_status_line(conn, 404, msg);
else {
dlen = dirserv_estimate_data_size(conn->fingerprint_stack,
1, deflated);
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");
return 0;
}
write_http_response_header(conn, -1,
deflated?"application/octet_stream":"text/plain",
deflated?"deflate":NULL, cache_lifetime);
if (deflated)
conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
/* Prime the connection with some data. */
connection_dirserv_flushed_some(conn);
}
return 0;
}
if (options->HSAuthoritativeDir &&
(!strcmpstart(url,"/tor/rendezvous/") ||
!strcmpstart(url,"/tor/rendezvous1/"))) {
/* rendezvous descriptor fetch */
const char *descp;
size_t desc_len;
int versioned = !strcmpstart(url,"/tor/rendezvous1/");
const char *query = url+strlen("/tor/rendezvous/")+(versioned?1:0);
switch (rend_cache_lookup_desc(query, versioned?-1:0, &descp, &desc_len)) {
case 1: /* valid */
write_http_response_header(conn, desc_len, "application/octet-stream",
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;
}
tor_free(url);
return 0;
}
if (!strcmpstart(url,"/tor/bytes.txt")) {
char *bytes = directory_dump_request_log();
size_t len = strlen(bytes);
write_http_response_header(conn, len, "text/plain", NULL, 0);
connection_write_to_buf(bytes, len, TO_CONN(conn));
tor_free(bytes);
tor_free(url);
return 0;
}
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, "text/plain", NULL,
ROBOTS_CACHE_LIFETIME);
connection_write_to_buf(robots, len, TO_CONN(conn));
tor_free(url);
return 0;
}
if (!strcmp(url,"/tor/dir-all-weaselhack") &&
(conn->_base.addr == 0x7f000001ul) &&
authdir_mode_v2(options) &&
!authdir_mode_bridge(options)) {
/* until weasel rewrites his scripts at noreply */
char *new_directory=NULL;
if (dirserv_dump_directory_to_string(&new_directory,
get_identity_key(), 1)) {
log_warn(LD_BUG, "Error creating full v1 directory.");
tor_free(new_directory);
write_http_status_line(conn, 503, "Directory unavailable");
return 0;
}
dlen = strlen(new_directory);
write_http_response_header(conn, dlen, "text/plain", "identity", 0);
connection_write_to_buf(new_directory, dlen, TO_CONN(conn));
tor_free(new_directory);
tor_free(url);
return 0;
}
/* we didn't recognize the url */
write_http_status_line(conn, 404, "Not found");
tor_free(url);
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 (!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");
return 0;
}
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);
if (authdir_mode_handles_descs(options) &&
!strcmp(url,"/tor/")) { /* server descriptor post */
const char *msg = NULL;
int r = dirserv_add_multiple_descriptors(body, &msg);
tor_assert(msg);
if (r > 0)
dirserv_get_directory(); /* rebuild and write to disk */
switch (r) {
case -2:
case -1:
case 1:
log_notice(LD_DIRSERV,
"Rejected router descriptor or extra-info from %s.",
conn->_base.address);
/* malformed descriptor, or something wrong */
write_http_status_line(conn, 400, msg);
break;
case 0: /* accepted but discarded */
case 2: /* accepted */
write_http_status_line(conn, 200, msg);
break;
}
goto done;
}
if (options->HSAuthoritativeDir &&
!strcmpstart(url,"/tor/rendezvous/publish")) {
/* rendezvous descriptor post */
if (rend_cache_store(body, body_len, 1) < 0) {
// char tmp[1024*2+1];
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 service descriptor rejected");
} else {
write_http_status_line(conn, 200, "Service descriptor stored");
}
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;
base16_decode(digest, DIGEST_LEN, fp, strlen(fp));
dir = router_get_trusteddirserver_by_digest(digest);
if (dir)
++dir->n_networkstatus_failures;
});
}
/** Called when one or more routerdesc (or extrainfo, if <b>was_extrainfo</b>)
* fetches have failed (with uppercase fingerprints listed in
* <b>failed</b>). */
static void
dir_routerdesc_download_failed(smartlist_t *failed, int status_code,
int was_extrainfo)
{
char digest[DIGEST_LEN];
time_t now = time(NULL);
int server = server_mode(get_options()) && get_options()->DirPort;
SMARTLIST_FOREACH(failed, const char *, cp,
{
download_status_t *dls = NULL;
base16_decode(digest, DIGEST_LEN, cp, strlen(cp));
if (was_extrainfo) {
signed_descriptor_t *sd =
router_get_by_extrainfo_digest(digest);
if (sd)
dls = &sd->ei_dl_status;
} else {
local_routerstatus_t *rs =
router_get_combined_status_by_descriptor_digest(digest);
if (rs)
dls = &rs->dl_status;
}
if (!dls || dls->n_download_failures >= MAX_ROUTERDESC_DOWNLOAD_FAILURES)
continue;
if (status_code != 503 || server)
++dls->n_download_failures;
if (server) {
switch (dls->n_download_failures) {
case 0: dls->next_attempt_at = 0; break;
case 1: dls->next_attempt_at = 0; break;
case 2: dls->next_attempt_at = 0; break;
case 3: dls->next_attempt_at = now+60; break;
case 4: dls->next_attempt_at = now+60; break;
case 5: dls->next_attempt_at = now+60*2; break;
case 6: dls->next_attempt_at = now+60*5; break;
case 7: dls->next_attempt_at = now+60*15; break;
default: dls->next_attempt_at = TIME_MAX; break;
}
} else {
switch (dls->n_download_failures) {
case 0: dls->next_attempt_at = 0; break;
case 1: dls->next_attempt_at = 0; break;
case 2: dls->next_attempt_at = now+60; break;
case 3: dls->next_attempt_at = now+60*5; break;
case 4: dls->next_attempt_at = now+60*10; break;
default: dls->next_attempt_at = TIME_MAX; break;
}
}
if (dls->next_attempt_at == 0)
log_debug(LD_DIR, "%s failed %d time(s); I'll try again immediately.",
cp, (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.",
cp, (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.",
cp, (int)dls->n_download_failures);
});
/* No need to relaunch descriptor downloads here: we already do it
* every 10 seconds (DESCRIPTOR_RETRY_INTERVAL) in main.c. */
}
/** 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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