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When requesting or serving resources via fingerprint/digest, request and respond in-order, removing duplicates.

Browse Source 
svn:r6673
This commit is contained in:
Nick Mathewson 2006-06-21 04:57:12 +00:00
parent 03bea739f8
commit e2697a62ac
6 changed files with 65 additions and 23 deletions
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14
src/common/container.c
View File

@ -461,6 +461,20 @@ smartlist_sort_strings(smartlist_t *sl)
smartlist_sort(sl, _compare_string_ptrs);
}
/** Helper: compare two DIGEST_LEN digests. */
static int
_compare_digests(const void **_a, const void **_b)
{
return memcmp((const char*)*_a, (const char*)*_b, DIGEST_LEN);
}
/** Sort the list of DIGEST_LEN-byte digests into ascending order. */
void
smartlist_sort_digests(smartlist_t *sl)
{
smartlist_sort(sl, _compare_string_ptrs);
}
#define DEFINE_MAP_STRUCTS(maptype, keydecl, prefix) \
typedef struct prefix ## entry_t { \
HT_ENTRY(prefix ## entry_t) node; \

1
src/common/container.h
View File

@ -72,6 +72,7 @@ void smartlist_insert(smartlist_t *sl, int idx, void *val);
void smartlist_sort(smartlist_t *sl,
int (*compare)(const void **a, const void **b));
void smartlist_sort_strings(smartlist_t *sl);
void smartlist_sort_digests(smartlist_t *sl);
void *smartlist_bsearch(smartlist_t *sl, const void *key,
int (*compare)(const void *key, const void **member));

54
src/or/directory.c
View File

@ -306,7 +306,7 @@ connection_dir_download_networkstatus_failed(connection_t *conn)
* failed, and possibly retry them later.*/
smartlist_t *failed = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+3,
failed, NULL, 0);
failed, NULL, 0, 0);
if (smartlist_len(failed)) {
dir_networkstatus_download_failed(failed);
SMARTLIST_FOREACH(failed, char *, cp, tor_free(cp));
@ -997,7 +997,7 @@ connection_dir_client_reached_eof(connection_t *conn)
!strcmpstart(conn->requested_resource,"fp/")) {
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+3,
which, NULL, 0);
which, NULL, 0, 0);
} else if (conn->requested_resource &&
!strcmpstart(conn->requested_resource, "all")) {
which = smartlist_create();
@ -1045,7 +1045,7 @@ connection_dir_client_reached_eof(connection_t *conn)
!strcmpstart(conn->requested_resource,"d/")) {
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+2,
which, NULL, 0);
which, NULL, 0, 0);
n_asked_for = smartlist_len(which);
}
if (status_code != 200) {
@ -1906,21 +1906,21 @@ dir_routerdesc_download_failed(smartlist_t *failed)
* 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.
* 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 decode_hex, int sort_uniq)
{
int old_len;
smartlist_t *fp_tmp = smartlist_create();
tor_assert(fp_out);
old_len = smartlist_len(fp_out);
smartlist_split_string(fp_out, resource, "+", 0, 0);
smartlist_split_string(fp_tmp, resource, "+", 0, 0);
if (compressed_out)
*compressed_out = 0;
if (smartlist_len(fp_out) > old_len) {
char *last = smartlist_get(fp_out,smartlist_len(fp_out)-1);
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';
@ -1931,27 +1931,51 @@ dir_split_resource_into_fingerprints(const char *resource,
if (decode_hex) {
int i;
char *cp, *d = NULL;
for (i = old_len; i < smartlist_len(fp_out); ++i) {
cp = smartlist_get(fp_out, i);
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(fp_out, i--);
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(fp_out, i--);
smartlist_del_keeporder(fp_tmp, i--);
goto again;
}
smartlist_set(fp_out, i, d);
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;
}

13
src/or/dirserv.c
View File

@ -1533,11 +1533,12 @@ dirserv_get_networkstatus_v2_fingerprints(smartlist_t *result,
smartlist_add(result, tor_memdup(ident, DIGEST_LEN));
iter = digestmap_iter_next(cached_v2_networkstatus, iter);
}
smartlist_sort_digests(result);
if (smartlist_len(result) == 0)
log_warn(LD_DIRSERV,
"Client requested 'all' network status objects; we have none.");
} else if (!strcmpstart(key, "fp/")) {
dir_split_resource_into_fingerprints(key+3, result, NULL, 1);
dir_split_resource_into_fingerprints(key+3, result, NULL, 1, 1);
}
}
@ -1586,7 +1587,7 @@ dirserv_get_networkstatus_v2(smartlist_t *result,
"Client requested 'all' network status objects; we have none.");
} else if (!strcmpstart(key, "fp/")) {
smartlist_t *digests = smartlist_create();
dir_split_resource_into_fingerprints(key+3, digests, NULL, 1);
dir_split_resource_into_fingerprints(key+3, digests, NULL, 1, 1);
SMARTLIST_FOREACH(digests, char *, cp,
{
cached_dir_t *cached;
@ -1629,10 +1630,10 @@ dirserv_get_routerdesc_fingerprints(smartlist_t *fps_out, const char *key,
tor_memdup(ri->cache_info.identity_digest, DIGEST_LEN));
} else if (!strcmpstart(key, "/tor/server/d/")) {
key += strlen("/tor/server/d/");
dir_split_resource_into_fingerprints(key, fps_out, NULL, 1);
dir_split_resource_into_fingerprints(key, fps_out, NULL, 1, 1);
} else if (!strcmpstart(key, "/tor/server/fp/")) {
key += strlen("/tor/server/fp/");
dir_split_resource_into_fingerprints(key, fps_out, NULL, 1);
dir_split_resource_into_fingerprints(key, fps_out, NULL, 1, 1);
} else {
*msg = "Key not recognized";
return -1;
@ -1680,7 +1681,7 @@ dirserv_get_routerdescs(smartlist_t *descs_out, const char *key,
} else if (!strcmpstart(key, "/tor/server/d/")) {
smartlist_t *digests = smartlist_create();
key += strlen("/tor/server/d/");
dir_split_resource_into_fingerprints(key, digests, NULL, 1);
dir_split_resource_into_fingerprints(key, digests, NULL, 1, 1);
SMARTLIST_FOREACH(digests, const char *, d,
{
signed_descriptor_t *sd = router_get_by_descriptor_digest(d);
@ -1693,7 +1694,7 @@ dirserv_get_routerdescs(smartlist_t *descs_out, const char *key,
smartlist_t *digests = smartlist_create();
time_t cutoff = time(NULL) - ROUTER_MAX_AGE_TO_PUBLISH;
key += strlen("/tor/server/fp/");
dir_split_resource_into_fingerprints(key, digests, NULL, 1);
dir_split_resource_into_fingerprints(key, digests, NULL, 1, 1);
SMARTLIST_FOREACH(digests, const char *, d,
{
if (router_digest_is_me(d)) {

2
src/or/or.h
View File

@ -1910,7 +1910,7 @@ int connection_dir_finished_connecting(connection_t *conn);
void connection_dir_request_failed(connection_t *conn);
int dir_split_resource_into_fingerprints(const char *resource,
smartlist_t *fp_out, int *compresseed_out,
int decode_hex);
int decode_hex, int sort_uniq);
char *directory_dump_request_log(void);
/********************************* dirserv.c ***************************/

4
src/or/routerlist.c
View File

@ -2507,6 +2507,7 @@ update_networkstatus_client_downloads(time_t now)
resource = tor_malloc(resource_len);
memcpy(resource, "fp/", 3);
cp = resource+3;
smartlist_sort_digests(missing);
needed = smartlist_len(missing);
SMARTLIST_FOREACH(missing, const char *, d,
{
@ -3252,7 +3253,7 @@ list_pending_descriptor_downloads(digestmap_t *result)
!conn->marked_for_close) {
if (!strcmpstart(conn->requested_resource, prefix))
dir_split_resource_into_fingerprints(conn->requested_resource+p_len,
tmp, NULL, 1);
tmp, NULL, 1, 0);
}
}
SMARTLIST_FOREACH(tmp, char *, d,
@ -3487,6 +3488,7 @@ update_router_descriptor_client_downloads(time_t now)
(n_downloadable+n_per_request-1)/n_per_request,
n_downloadable>n_per_request?"s":"",
n_downloadable, n_downloadable>1?"s":"", n_per_request);
smartlist_sort_digests(downloadable);
for (i=0; i < n_downloadable; i += n_per_request) {
initiate_descriptor_downloads(NULL, downloadable, i, i+n_per_request);
}