/** Free the storage held by the service descriptor <b>desc</b>.
*/
void
rend_service_descriptor_free(rend_service_descriptor_t *desc)
{
if (!desc)
return;
if (desc->pk)
crypto_pk_free(desc->pk);
if (desc->intro_nodes) {
SMARTLIST_FOREACH(desc->intro_nodes, rend_intro_point_t *, intro,
rend_intro_point_free(intro););
/** Parse the encoded introduction points in <b>intro_points_encoded</b> of
* length <b>intro_points_encoded_size</b> and write the result to the
* descriptor in <b>parsed</b>; return the number of successfully parsed
* introduction points or -1 in case of a failure. */
int
rend_parse_introduction_points(rend_service_descriptor_t *parsed,
const char *intro_points_encoded,
size_t intro_points_encoded_size)
{
const char *current_ipo, *end_of_intro_points;
smartlist_t *tokens = NULL;
directory_token_t *tok;
rend_intro_point_t *intro;
extend_info_t *info;
int result, num_ok=1;
memarea_t *area = NULL;
tor_assert(parsed);
/** Function may only be invoked once. */
tor_assert(!parsed->intro_nodes);
if (!intro_points_encoded || intro_points_encoded_size == 0) {
log_warn(LD_REND, "Empty or zero size introduction point list");
goto err;
}
/* Consider one intro point after the other. */
current_ipo = intro_points_encoded;
end_of_intro_points = intro_points_encoded + intro_points_encoded_size;
tokens = smartlist_new();
parsed->intro_nodes = smartlist_new();
area = memarea_new();
while (!fast_memcmpstart(current_ipo, end_of_intro_points-current_ipo,
"introduction-point ")) {
/* Determine end of string. */
const char *eos = tor_memstr(current_ipo, end_of_intro_points-current_ipo,
"\nintroduction-point ");
if (!eos)
eos = end_of_intro_points;
else
eos = eos+1;
tor_assert(eos <= intro_points_encoded+intro_points_encoded_size);
/* Free tokens and clear token list. */
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_clear(tokens);
memarea_clear(area);
/* Tokenize string. */
if (tokenize_string(area, current_ipo, eos, tokens, ipo_token_table, 0)) {
log_warn(LD_REND, "Error tokenizing introduction point");
goto err;
}
/* Advance to next introduction point, if available. */
current_ipo = eos;
/* Check minimum allowed length of introduction point. */
if (smartlist_len(tokens) < 5) {
log_warn(LD_REND, "Impossibly short introduction point.");
goto err;
}
/* Allocate new intro point and extend info. */
intro = tor_malloc_zero(sizeof(rend_intro_point_t));
info = intro->extend_info = tor_malloc_zero(sizeof(extend_info_t));
/* Parse identifier. */
tok = find_by_keyword(tokens, R_IPO_IDENTIFIER);
if (base32_decode(info->identity_digest, DIGEST_LEN,
tok->args[0], REND_INTRO_POINT_ID_LEN_BASE32) < 0) {
log_warn(LD_REND, "Identity digest contains illegal characters: %s",
tok->args[0]);
rend_intro_point_free(intro);
goto err;
}
/* Write identifier to nickname. */
info->nickname[0] = '$';
base16_encode(info->nickname + 1, sizeof(info->nickname) - 1,
info->identity_digest, DIGEST_LEN);
/* Parse IP address. */
tok = find_by_keyword(tokens, R_IPO_IP_ADDRESS);
if (tor_addr_parse(&info->addr, tok->args[0])<0) {
log_warn(LD_REND, "Could not parse introduction point address.");
rend_intro_point_free(intro);
goto err;
}
if (tor_addr_family(&info->addr) != AF_INET) {
log_warn(LD_REND, "Introduction point address was not ipv4.");
rend_intro_point_free(intro);
goto err;
}
/* Parse onion port. */
tok = find_by_keyword(tokens, R_IPO_ONION_PORT);
info->port = (uint16_t) tor_parse_long(tok->args[0],10,1,65535,
&num_ok,NULL);
if (!info->port || !num_ok) {
log_warn(LD_REND, "Introduction point onion port %s is invalid",
escaped(tok->args[0]));
rend_intro_point_free(intro);
goto err;
}
/* Parse onion key. */
tok = find_by_keyword(tokens, R_IPO_ONION_KEY);
if (!crypto_pk_public_exponent_ok(tok->key)) {
log_warn(LD_REND,
"Introduction point's onion key had invalid exponent.");
rend_intro_point_free(intro);
goto err;
}
info->onion_key = tok->key;
tok->key = NULL; /* Prevent free */
/* Parse service key. */
tok = find_by_keyword(tokens, R_IPO_SERVICE_KEY);
if (!crypto_pk_public_exponent_ok(tok->key)) {
log_warn(LD_REND,
"Introduction point key had invalid exponent.");
rend_intro_point_free(intro);
goto err;
}
intro->intro_key = tok->key;
tok->key = NULL; /* Prevent free */
/* Add extend info to list of introduction points. */
smartlist_add(parsed->intro_nodes, intro);
}
result = smartlist_len(parsed->intro_nodes);
goto done;
err:
result = -1;
done:
/* Free tokens and clear token list. */
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
}
if (area)
memarea_drop_all(area);
return result;
}
