commit 9018da06c783dbc8a6d1e10b0c3ae2790d052981 Author: Nick Mathewson nickm@torproject.org Date: Tue Jun 20 11:46:54 2017 -0400

Short-circuit the no-decompression-needed case, for clarity

This commit is mostly just deindentation. --- src/or/directory.c | 157 +++++++++++++++++++++++++++-------------------------- 1 file changed, 80 insertions(+), 77 deletions(-)

diff --git a/src/or/directory.c b/src/or/directory.c index 52a24e0..89e4bbc4 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -2205,88 +2205,91 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp, conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC);

int plausible = body_is_plausible(body, body_len, conn->base_.purpose); - if (compression != NO_METHOD || !plausible) { - int severity = LOG_DEBUG; - char *new_body = NULL; - size_t new_len = 0; - const char *description1, *description2; - int want_to_try_both = 0; - int tried_both = 0; - compress_method_t guessed = detect_compression_method(body, body_len); - - description1 = compression_method_get_human_name(compression); - - if (BUG(description1 == NULL)) - description1 = compression_method_get_human_name(UNKNOWN_METHOD); - - if (guessed == UNKNOWN_METHOD && !plausible) - description2 = "confusing binary junk"; - else - description2 = compression_method_get_human_name(guessed);

- /* Tell the user if we don't believe what we're told about compression.*/ - want_to_try_both = (compression == UNKNOWN_METHOD || - guessed != compression); - if (want_to_try_both) { - severity = LOG_INFO; - } + if (plausible && compression == NO_METHOD) { + return 0; + }

- tor_log(severity, LD_HTTP, - "HTTP body from server '%s:%d' was labeled as %s, " - "%s it seems to be %s.%s", - conn->base_.address, conn->base_.port, description1, - guessed != compression?"but":"and", - description2, - (compression>0 && guessed>0 && want_to_try_both)? - " Trying both.":""); - - /* Try declared compression first if we can. - * tor_compress_supports_method() also returns true for NO_METHOD. - * Ensure that the server is not sending us data compressed using a - * compression method that is not allowed for anonymous connections. */ - if (anonymized_connection && - ! allowed_anonymous_connection_compression_method(compression)) { - warn_disallowed_anonymous_compression_method(compression); - rv = -1; - goto done; - } + int severity = LOG_DEBUG; + char *new_body = NULL; + size_t new_len = 0; + const char *description1, *description2; + int want_to_try_both = 0; + int tried_both = 0; + compress_method_t guessed = detect_compression_method(body, body_len);

- if (tor_compress_supports_method(compression)) - tor_uncompress(&new_body, &new_len, body, body_len, compression, - !allow_partial, LOG_PROTOCOL_WARN); + description1 = compression_method_get_human_name(compression);

- /* Okay, if that didn't work, and we think that it was compressed - * differently, try that. */ - if (anonymized_connection && - ! allowed_anonymous_connection_compression_method(guessed)) { - warn_disallowed_anonymous_compression_method(guessed); - rv = -1; - goto done; - } + if (BUG(description1 == NULL)) + description1 = compression_method_get_human_name(UNKNOWN_METHOD);

- if (!new_body && tor_compress_supports_method(guessed) && - compression != guessed) { - tor_uncompress(&new_body, &new_len, body, body_len, guessed, - !allow_partial, LOG_PROTOCOL_WARN); - tried_both = 1; - } - /* 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 (tried %s%s%s, server '%s:%d').", - description1, - tried_both?" and ":"", - tried_both?description2:"", - conn->base_.address, conn->base_.port); - rv = -1; - goto done; - } - if (new_body) { - tor_free(*bodyp); - *bodyp = new_body; - *bodylenp = new_len; - } + if (guessed == UNKNOWN_METHOD && !plausible) + description2 = "confusing binary junk"; + else + description2 = compression_method_get_human_name(guessed); + + /* Tell the user if we don't believe what we're told about compression.*/ + want_to_try_both = (compression == UNKNOWN_METHOD || + guessed != compression); + if (want_to_try_both) { + severity = LOG_INFO; + } + + tor_log(severity, LD_HTTP, + "HTTP body from server '%s:%d' was labeled as %s, " + "%s it seems to be %s.%s", + conn->base_.address, conn->base_.port, description1, + guessed != compression?"but":"and", + description2, + (compression>0 && guessed>0 && want_to_try_both)? + " Trying both.":""); + + /* Try declared compression first if we can. + * tor_compress_supports_method() also returns true for NO_METHOD. + * Ensure that the server is not sending us data compressed using a + * compression method that is not allowed for anonymous connections. */ + if (anonymized_connection && + ! allowed_anonymous_connection_compression_method(compression)) { + warn_disallowed_anonymous_compression_method(compression); + rv = -1; + goto done; + } + + if (tor_compress_supports_method(compression)) + tor_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 (anonymized_connection && + ! allowed_anonymous_connection_compression_method(guessed)) { + warn_disallowed_anonymous_compression_method(guessed); + rv = -1; + goto done; + } + + if (!new_body && tor_compress_supports_method(guessed) && + compression != guessed) { + tor_uncompress(&new_body, &new_len, body, body_len, guessed, + !allow_partial, LOG_PROTOCOL_WARN); + tried_both = 1; + } + /* 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 (tried %s%s%s, server '%s:%d').", + description1, + tried_both?" and ":"", + tried_both?description2:"", + conn->base_.address, conn->base_.port); + rv = -1; + goto done; + } + if (new_body) { + tor_free(*bodyp); + *bodyp = new_body; + *bodylenp = new_len; }

done: