commit 3f97c665aa8b0fee06b22160e3c10ef7d896618d Author: Nick Mathewson nickm@torproject.org Date: Tue Jun 28 15:06:56 2011 -0400

Document feature3116 fns and improve output

- We were reporting the _bottom_ N failing states, not the top N. - With bufferevents enabled, we logged all TLS states as being "in bufferevent", which isn't actually informative. - When we had nothing to report, we reported nothing too loudly. - Also, we needed documentation. --- src/common/tortls.c | 13 ++++++++----- src/or/connection_or.c | 34 +++++++++++++++++++++------------- 2 files changed, 29 insertions(+), 18 deletions(-)

diff --git a/src/common/tortls.c b/src/common/tortls.c index 8db47a6..a208bc7 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -222,7 +222,8 @@ ssl_state_to_string(int ssl_state) return buf; }

-/** DOCDOC 3116 */ +/** Write a description of the current state of <b>tls</b> into the + * <b>sz</b>-byte buffer at <b>buf</b>. */ void tor_tls_get_state_description(tor_tls_t *tls, char *buf, size_t sz) { @@ -236,21 +237,23 @@ tor_tls_get_state_description(tor_tls_t *tls, char *buf, size_t sz)

ssl_state = ssl_state_to_string(tls->ssl->state); switch (tls->state) { -#define CASE(st) case TOR_TLS_ST_##st: tortls_state = #st ; break +#define CASE(st) case TOR_TLS_ST_##st: tortls_state = " in "#st ; break CASE(HANDSHAKE); CASE(OPEN); CASE(GOTCLOSE); CASE(SENTCLOSE); CASE(CLOSED); CASE(RENEGOTIATE); - CASE(BUFFEREVENT); #undef CASE + case TOR_TLS_ST_BUFFEREVENT: + tortls_state = ""; + break; default: - tortls_state = "unknown"; + tortls_state = " in unknown TLS state"; break; }

- tor_snprintf(buf, sz, "%s in %s", ssl_state, tortls_state); + tor_snprintf(buf, sz, "%s%s", ssl_state, tortls_state); }

void diff --git a/src/or/connection_or.c b/src/or/connection_or.c index b5cd68a..e755c7e 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -152,10 +152,13 @@ connection_or_set_identity_digest(or_connection_t *conn, const char *digest)

/**************************************************************/

-/** DOCDOC */ +/** Map from a string describing what a non-open OR connection was doing when + * failed, to an intptr_t describing the count of connections that failed that + * way. Note that the count is stored _as_ the pointer. + */ static strmap_t *broken_connection_counts;

-/** DOCDOC */ +/** Record that an OR connection failed in <b>state</b>. */ static void note_broken_connection(const char *state) { @@ -171,7 +174,7 @@ note_broken_connection(const char *state) strmap_set(broken_connection_counts, state, ptr); }

-/** DOCDOC */ +/** Forget all recorded states for failed connections. */ void clear_broken_connection_map(void) { @@ -180,7 +183,10 @@ clear_broken_connection_map(void) broken_connection_counts = NULL; }

-/** DOCDOC */ +/** Write a detailed description the state of <b>orconn</b> into the + * <b>buflen</b>-byte buffer at <b>buf</b>. This description includes not + * only the OR-conn level state but also the TLS state. It's useful for + * diagnosing broken handshakes. */ static void connection_or_get_state_description(or_connection_t *orconn, char *buf, size_t buflen) @@ -197,7 +203,8 @@ connection_or_get_state_description(or_connection_t *orconn, tor_snprintf(buf, buflen, "%s with SSL state %s", conn_state, tls_state); }

-/** DOCDOC */ +/** Record the current state of <b>orconn</b> as the state of a broken + * connection. */ static void connection_or_note_state_when_broken(or_connection_t *orconn) { @@ -207,34 +214,35 @@ connection_or_note_state_when_broken(or_connection_t *orconn) note_broken_connection(buf); }

-/** DOCDOC */ +/** Helper type used to sort connection states and find the most frequent. */ typedef struct broken_state_count_t { intptr_t count; const char *state; } broken_state_count_t;

-/** DOCDOC */ +/** Helper function used to sort broken_state_count_t by frequency. */ static int broken_state_count_compare(const void **a_ptr, const void **b_ptr) { const broken_state_count_t *a = *a_ptr, *b = *b_ptr; - return a->count - b->count; + return b->count - a->count; }

-/** DOCDOC */ +/** Upper limit on the number of different states to report for connection + * failure. */ #define MAX_REASONS_TO_REPORT 10

-/** DOCDOC */ +/** Report a list of the top states for failed OR connections at log level + * <b>severity</b>, in log domain <b>domain</b>. */ void connection_or_report_broken_states(int severity, int domain) { int total = 0; smartlist_t *items;

- if (!broken_connection_counts) { - log(severity, domain, "No broken connections reported"); + if (!broken_connection_counts) return; - } + items = smartlist_create(); STRMAP_FOREACH(broken_connection_counts, state, void *, countptr) { broken_state_count_t *c = tor_malloc(sizeof(broken_state_count_t));