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synced 2024-11-10 21:23:58 +01:00
Decide compression method in the various handle_* functions().
See: https://bugs.torproject.org/21667
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@ -3706,6 +3706,22 @@ find_best_diff(const smartlist_t *digests, int flav,
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return NULL;
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}
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/** Try to find the best supported compression method possible from a given
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* <b>compression_methods</b>. Return NO_METHOD if no mutually supported
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* compression method could be found. */
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static compress_method_t
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find_best_compression_method(unsigned compression_methods)
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{
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unsigned u;
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for (u = 0; u < ARRAY_LENGTH(srv_meth_pref_precompressed); ++u) {
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compress_method_t method = srv_meth_pref_precompressed[u];
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if (compression_methods & (1u<<method))
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return method;
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}
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return NO_METHOD;
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}
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/** Helper function for GET /tor/status-vote/current/consensus
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*/
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static int
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@ -3713,7 +3729,8 @@ handle_get_current_consensus(dir_connection_t *conn,
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const get_handler_args_t *args)
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{
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const char *url = args->url;
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const int compressed = args->compression_supported & (1u << ZLIB_METHOD);
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const compress_method_t compress_method =
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find_best_compression_method(args->compression_supported);
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const time_t if_modified_since = args->if_modified_since;
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int clear_spool = 0;
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@ -3786,11 +3803,11 @@ handle_get_current_consensus(dir_connection_t *conn,
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} else if (flavor) {
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spooled = spooled_resource_new(DIR_SPOOL_NETWORKSTATUS,
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(uint8_t*)flavor, strlen(flavor));
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compression_used = compressed ? ZLIB_METHOD : NO_METHOD;
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compression_used = compress_method;
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} else {
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spooled = spooled_resource_new(DIR_SPOOL_NETWORKSTATUS,
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NULL, 0);
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compression_used = compressed ? ZLIB_METHOD : NO_METHOD;
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compression_used = compress_method;
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}
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tor_free(flavor);
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smartlist_add(conn->spool, spooled);
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@ -3806,7 +3823,7 @@ handle_get_current_consensus(dir_connection_t *conn,
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size_t size_guess = 0;
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int n_expired = 0;
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dirserv_spool_remove_missing_and_guess_size(conn, if_modified_since,
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compressed,
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compress_method != NO_METHOD,
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&size_guess,
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&n_expired);
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@ -3848,8 +3865,8 @@ handle_get_current_consensus(dir_connection_t *conn,
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write_http_response_header(conn, -1,
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compression_used,
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smartlist_len(conn->spool) == 1 ? lifetime : 0);
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if (! compressed)
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conn->compress_state = tor_compress_new(0, ZLIB_METHOD,
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if (compress_method != NO_METHOD)
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conn->compress_state = tor_compress_new(0, compress_method,
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HIGH_COMPRESSION);
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/* Prime the connection with some data. */
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@ -3870,7 +3887,8 @@ static int
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handle_get_status_vote(dir_connection_t *conn, const get_handler_args_t *args)
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{
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const char *url = args->url;
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const int compressed = args->compression_supported & (1u << ZLIB_METHOD);
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const compress_method_t compress_method =
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find_best_compression_method(args->compression_supported);
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{
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int current;
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ssize_t body_len = 0;
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@ -3927,13 +3945,13 @@ handle_get_status_vote(dir_connection_t *conn, const get_handler_args_t *args)
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goto vote_done;
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}
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SMARTLIST_FOREACH(dir_items, cached_dir_t *, d,
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body_len += compressed
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body_len += compress_method != NO_METHOD
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? d->dir_compressed_len
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: d->dir_len);
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estimated_len += body_len;
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SMARTLIST_FOREACH(items, const char *, item, {
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size_t ln = strlen(item);
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if (compressed) {
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if (compress_method != NO_METHOD) {
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estimated_len += ln/2;
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} else {
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body_len += ln; estimated_len += ln;
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@ -3945,12 +3963,12 @@ handle_get_status_vote(dir_connection_t *conn, const get_handler_args_t *args)
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goto vote_done;
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}
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write_http_response_header(conn, body_len ? body_len : -1,
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compressed ? ZLIB_METHOD : NO_METHOD,
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compress_method,
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lifetime);
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if (smartlist_len(items)) {
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if (compressed) {
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conn->compress_state = tor_compress_new(1, ZLIB_METHOD,
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if (compress_method != NO_METHOD) {
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conn->compress_state = tor_compress_new(1, compress_method,
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choose_compression_level(estimated_len));
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SMARTLIST_FOREACH(items, const char *, c,
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connection_write_to_buf_compress(c, strlen(c), conn, 0));
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@ -3961,9 +3979,9 @@ handle_get_status_vote(dir_connection_t *conn, const get_handler_args_t *args)
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}
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} else {
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SMARTLIST_FOREACH(dir_items, cached_dir_t *, d,
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connection_write_to_buf(compressed
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connection_write_to_buf(compress_method != NO_METHOD
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? d->dir_compressed : d->dir,
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compressed
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compress_method != NO_METHOD
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? d->dir_compressed_len : d->dir_len,
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TO_CONN(conn)));
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}
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@ -3982,7 +4000,8 @@ static int
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handle_get_microdesc(dir_connection_t *conn, const get_handler_args_t *args)
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{
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const char *url = args->url;
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const int compressed = args->compression_supported & (1u << ZLIB_METHOD);
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const compress_method_t compress_method =
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find_best_compression_method(args->compression_supported);
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int clear_spool = 1;
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{
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conn->spool = smartlist_new();
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@ -3993,7 +4012,8 @@ handle_get_microdesc(dir_connection_t *conn, const get_handler_args_t *args)
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DSR_DIGEST256|DSR_BASE64|DSR_SORT_UNIQ);
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size_t size_guess = 0;
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dirserv_spool_remove_missing_and_guess_size(conn, 0, compressed,
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dirserv_spool_remove_missing_and_guess_size(conn, 0,
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compress_method != NO_METHOD,
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&size_guess, NULL);
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if (smartlist_len(conn->spool) == 0) {
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write_http_status_line(conn, 404, "Not found");
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@ -4009,11 +4029,11 @@ handle_get_microdesc(dir_connection_t *conn, const get_handler_args_t *args)
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clear_spool = 0;
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write_http_response_header(conn, -1,
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compressed ? ZLIB_METHOD : NO_METHOD,
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compress_method,
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MICRODESC_CACHE_LIFETIME);
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if (compressed)
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conn->compress_state = tor_compress_new(1, ZLIB_METHOD,
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if (compress_method != NO_METHOD)
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conn->compress_state = tor_compress_new(1, compress_method,
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choose_compression_level(size_guess));
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const int initial_flush_result = connection_dirserv_flushed_some(conn);
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@ -4034,7 +4054,8 @@ static int
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handle_get_descriptor(dir_connection_t *conn, const get_handler_args_t *args)
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{
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const char *url = args->url;
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const int compressed = args->compression_supported & (1u << ZLIB_METHOD);
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const compress_method_t compress_method =
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find_best_compression_method(args->compression_supported);
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const or_options_t *options = get_options();
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int clear_spool = 1;
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if (!strcmpstart(url,"/tor/server/") ||
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@ -4073,8 +4094,8 @@ handle_get_descriptor(dir_connection_t *conn, const get_handler_args_t *args)
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size_t size_guess = 0;
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int n_expired = 0;
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dirserv_spool_remove_missing_and_guess_size(conn, publish_cutoff,
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compressed, &size_guess,
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&n_expired);
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compress_method != NO_METHOD,
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&size_guess, &n_expired);
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/* If we are the bridge authority and the descriptor is a bridge
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* descriptor, remember that we served this descriptor for desc stats. */
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@ -4104,11 +4125,9 @@ handle_get_descriptor(dir_connection_t *conn, const get_handler_args_t *args)
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dir_conn_clear_spool(conn);
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goto done;
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}
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write_http_response_header(conn, -1,
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compressed ? ZLIB_METHOD : NO_METHOD,
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cache_lifetime);
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if (compressed)
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conn->compress_state = tor_compress_new(1, ZLIB_METHOD,
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write_http_response_header(conn, -1, compress_method, cache_lifetime);
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if (compress_method != NO_METHOD)
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conn->compress_state = tor_compress_new(1, compress_method,
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choose_compression_level(size_guess));
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clear_spool = 0;
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/* Prime the connection with some data. */
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@ -4129,7 +4148,8 @@ static int
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handle_get_keys(dir_connection_t *conn, const get_handler_args_t *args)
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{
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const char *url = args->url;
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const int compressed = args->compression_supported & (1u << ZLIB_METHOD);
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const compress_method_t compress_method =
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find_best_compression_method(args->compression_supported);
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const time_t if_modified_since = args->if_modified_since;
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{
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smartlist_t *certs = smartlist_new();
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@ -4192,16 +4212,19 @@ handle_get_keys(dir_connection_t *conn, const get_handler_args_t *args)
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SMARTLIST_FOREACH(certs, authority_cert_t *, c,
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len += c->cache_info.signed_descriptor_len);
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if (global_write_bucket_low(TO_CONN(conn), compressed?len/2:len, 2)) {
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if (global_write_bucket_low(TO_CONN(conn),
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compress_method != NO_METHOD ? len/2 : len,
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2)) {
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write_http_status_line(conn, 503, "Directory busy, try again later");
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goto keys_done;
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}
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write_http_response_header(conn, compressed?-1:len,
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compressed ? ZLIB_METHOD : NO_METHOD,
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write_http_response_header(conn,
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compress_method != NO_METHOD ? -1 : len,
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compress_method,
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60*60);
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if (compressed) {
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conn->compress_state = tor_compress_new(1, ZLIB_METHOD,
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if (compress_method != NO_METHOD) {
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conn->compress_state = tor_compress_new(1, compress_method,
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choose_compression_level(len));
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SMARTLIST_FOREACH(certs, authority_cert_t *, c,
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connection_write_to_buf_compress(
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