/** Parse a file containing router descriptors and load them to our
routerlist. This function is used to setup an artificial network
so that we can conduct tests on it. */
void
helper_setup_fake_routerlist(void)
{
int retval;
routerlist_t *our_routerlist = NULL;
smartlist_t *our_nodelist = NULL;
/* Read the file that contains our test descriptors. */
/* We need to mock this function otherwise the descriptors will not
accepted as they are too old. */
MOCK(router_descriptor_is_older_than,
router_descriptor_is_older_than_replacement);
/* Load all the test descriptors to the routerlist. */
retval = router_load_routers_from_string(TEST_DESCRIPTORS,
NULL, SAVED_IN_JOURNAL,
NULL, 0, NULL);
tt_int_op(retval, ==, HELPER_NUMBER_OF_DESCRIPTORS);
/* Sanity checking of routerlist and nodelist. */
our_routerlist = router_get_routerlist();
tt_int_op(smartlist_len(our_routerlist->routers), ==,
HELPER_NUMBER_OF_DESCRIPTORS);
routerlist_assert_ok(our_routerlist);
our_nodelist = nodelist_get_list();
tt_int_op(smartlist_len(our_nodelist), ==, HELPER_NUMBER_OF_DESCRIPTORS);
/* Mark all routers as non-guards but up and running! */
SMARTLIST_FOREACH_BEGIN(our_nodelist, node_t *, node) {
node->is_running = 1;
node->is_valid = 1;
node->is_possible_guard = 0;
} SMARTLIST_FOREACH_END(node);
/* replacement for torflow in Tor. for now just grab the bandwidth we configured
* in the XML and use that as the measured bandwidth value. since our configured
* bandwidth doesnt change over time, this could just be run once (by setting the
* time far in the future so the file is not seen as outdated). but we need to
* run it after all routers are loaded, so its best to re-run periodically.
*
* eventually we will want an option to run something similar to the actual
* torflow scripts that download files over Tor and computes bandwidth values.
* in that case it needs to run more often to keep monitoring the actual state
* of the network.
*
* torflow writes a few things to the v3bwfile. all Tor currently uses is:
*
* 0123456789
* node_id=$0123456789ABCDEF0123456789ABCDEF01234567 bw=12345
* ...
*
* where 0123456789 is the time, 0123456789ABCDEF0123456789ABCDEF01234567 is
* the relay's fingerprint, and 12345 is the measured bandwidth in ?.
*/
void scalliontor_init_v3bw(ScallionTor* stor) {
/* open the bw file, clearing it if it exists */
FILE *v3bw = fopen(stor->v3bw_name, "w");
if(v3bw == NULL) {
stor->shadowlibFuncs->log(SHADOW_LOG_LEVEL_MESSAGE, __FUNCTION__,
"v3bandwidth file not updated: can not open file '%s'\n", stor->v3bw_name);
return;
}
time_t maxtime = -1;
/* print time part on first line */
if(fprintf(v3bw, "%lu\n", maxtime) < 0) {
/* uhhhh... */
stor->shadowlibFuncs->log(SHADOW_LOG_LEVEL_MESSAGE, __FUNCTION__,
"v3bandwidth file not updated: can write time '%u' to file '%s'\n", maxtime, stor->v3bw_name);
return;
}
routerlist_t *rlist = router_get_routerlist();
routerinfo_t *rinfo;
/* print an entry for each router */
for (int i=0; i < smartlist_len(rlist->routers); i++) {
rinfo = smartlist_get(rlist->routers, i);
/* get the fingerprint from its digest */
char node_id[HEX_DIGEST_LEN+1];
base16_encode(node_id, HEX_DIGEST_LEN+1, rinfo->cache_info.identity_digest, DIGEST_LEN);
/* the network address */
in_addr_t netaddr = htonl(rinfo->addr);
/* ask shadow for this node's configured bandwidth */
guint bwdown = 0, bwup = 0;
stor->shadowlibFuncs->getBandwidth(netaddr, &bwdown, &bwup);
/* XXX careful here! shadow bandwidth may be different than the consensus
* right now i believe this v3bw file is not used to compute the consensus
* "w Bandwidth" line, and
* intercept_rep_hist_bandwidth_assess and
* intercept_router_get_advertised_bandwidth_capped
* takes care of things. so leave it for now.
*/
guint bw = MIN(bwup, bwdown);
if(fprintf(v3bw, "node_id=$%s bw=%u\n", node_id, bw) < 0) {
/* uhhhh... */
stor->shadowlibFuncs->log(SHADOW_LOG_LEVEL_MESSAGE, __FUNCTION__,
"v3bandwidth file not updated: can write line 'node_id=$%s bw=%u\n' to file '%s'\n", node_id, bw, stor->v3bw_name);
return;
}
}
fclose(v3bw);
/* reschedule */
stor->shadowlibFuncs->createCallback((ShadowPluginCallbackFunc)scalliontor_init_v3bw, (gpointer)stor, VTORFLOW_SCHED_PERIOD);
}
/** As dirserv_get_routerdescs(), but instead of getting signed_descriptor_t
* pointers, adds copies of digests to fps_out, and doesn't use the
* /tor/server/ prefix. For a /d/ request, adds descriptor digests; for other
* requests, adds identity digests.
*/
int
dirserv_get_routerdesc_spool(smartlist_t *spool_out,
const char *key,
dir_spool_source_t source,
int conn_is_encrypted,
const char **msg_out)
{
*msg_out = NULL;
if (!strcmp(key, "all")) {
const routerlist_t *rl = router_get_routerlist();
SMARTLIST_FOREACH_BEGIN(rl->routers, const routerinfo_t *, r) {
spooled_resource_t *spooled;
spooled = spooled_resource_new(source,
(const uint8_t *)r->cache_info.identity_digest,
DIGEST_LEN);
/* Treat "all" requests as if they were unencrypted */
conn_is_encrypted = 0;
smartlist_add(spool_out, spooled);
} SMARTLIST_FOREACH_END(r);
} else if (!strcmp(key, "authority")) {
