/**
* Handle reception of a /Q2
*/
static void
g2_node_handle_q2(gnutella_node_t *n, const g2_tree_t *t)
{
const guid_t *muid;
size_t paylen;
const g2_tree_t *c;
char *dn = NULL;
char *md = NULL;
uint32 iflags = 0;
search_request_info_t sri;
bool has_interest = FALSE;
node_inc_rx_query(n);
/*
* As a G2 leaf, we cannot handle queries coming from UDP because we
* are not supposed to get any!
*/
if (NODE_IS_UDP(n)) {
g2_node_drop(G_STRFUNC, n, t, "coming from UDP");
return;
}
/*
* The MUID of the query is the payload of the root node.
*/
muid = g2_tree_node_payload(t, &paylen);
if (paylen != GUID_RAW_SIZE) {
g2_node_drop(G_STRFUNC, n, t, "missing MUID");
return;
}
/*
* Make sure we have never seen this query already.
*
* To be able to leverage on Gnutella's routing table to detect duplicates
* over a certain lifespan, we are going to fake a minimal Gnutella header
* with a message type of GTA_MSG_G2_SEARCH, which is never actually used
* on the network.
*
* The TTL and hops are set to 1 and 0 initially, so that the message seems
* to come from a neighbouring host and cannot be forwarded.
*
* When that is done, we will be able to call route_message() and have
* all the necessary bookkeeping done for us.
*/
{
struct route_dest dest;
gnutella_header_set_muid(&n->header, muid);
gnutella_header_set_function(&n->header, GTA_MSG_G2_SEARCH);
gnutella_header_set_ttl(&n->header, 1);
gnutella_header_set_hops(&n->header, 0);
if (!route_message(&n, &dest))
return; /* Already accounted as duplicated, and logged */
}
/*
* Setup request information so that we can call search_request()
* to process our G2 query.
*/
ZERO(&sri);
sri.magic = SEARCH_REQUEST_INFO_MAGIC;
/*
* Handle the children of /Q2.
*/
G2_TREE_CHILD_FOREACH(t, c) {
enum g2_q2_child ct = TOKENIZE(g2_tree_name(c), g2_q2_children);
const char *payload;
switch (ct) {
case G2_Q2_DN:
payload = g2_tree_node_payload(c, &paylen);
if (payload != NULL && NULL == dn) {
uint off = 0;
/* Not NUL-terminated, need to h_strndup() it */
dn = h_strndup(payload, paylen);
if (!query_utf8_decode(dn, &off)) {
gnet_stats_count_dropped(n, MSG_DROP_MALFORMED_UTF_8);
goto done; /* Drop the query */
}
sri.extended_query = dn + off;
sri.search_len = paylen - off; /* In bytes */
}
break;
case G2_Q2_I:
if (!has_interest)
iflags = g2_node_extract_interest(c);
has_interest = TRUE;
break;
case G2_Q2_MD:
payload = g2_tree_node_payload(c, &paylen);
if (payload != NULL && NULL == md) {
/* Not NUL-terminated, need to h_strndup() it */
md = h_strndup(payload, paylen);
}
break;
case G2_Q2_NAT:
sri.flags |= QUERY_F_FIREWALLED;
break;
case G2_Q2_SZR: /* Size limits */
if (g2_node_extract_size_request(c, &sri.minsize, &sri.maxsize))
sri.size_restrictions = TRUE;
break;
case G2_Q2_UDP:
if (!sri.oob)
g2_node_extract_udp(c, &sri, n);
break;
case G2_Q2_URN:
g2_node_extract_urn(c, &sri);
break;
}
}
/*
* When there is no /Q2/I, return a default set of information.
*/
if (!has_interest)
iflags = G2_Q2_F_DFLT;
/*
* If there are meta-data, try to intuit which media types there are
* looking for.
*
* The payload is XML looking like "<audio/>" or "<video/>" but there
* can be attributes and we don't want to do a full XML parsing there.
* Hence we'll base our analysis on simple lexical parsing, which is
* why we call a routine to "intuit", not to "extract".
*
* Also, this is poorer than Gnutella's GGEP "M" because apparently there
* can be only one single type, since the XML payload must obey some
* kind of schema and there is an audio schema, a video schema, etc...
* XML was just a wrong design choice there.
*/
if (md != NULL)
sri.media_types = g2_node_intuit_media_type(md);
/*
* Validate the return address if OOB hit delivery is configured.
*/
if (sri.oob && !search_oob_is_allowed(n, &sri))
goto done;
/*
* Update statistics, as done in search_request_preprocess() for Gnutella.
*/
if (sri.exv_sha1cnt) {
gnet_stats_inc_general(GNR_QUERY_G2_SHA1);
if (NULL == dn) {
int i;
for (i = 0; i < sri.exv_sha1cnt; i++) {
search_request_listener_emit(QUERY_SHA1,
sha1_base32(&sri.exv_sha1[i].sha1), n->addr, n->port);
}
}
}
if (dn != NULL && !is_ascii_string(dn))
gnet_stats_inc_general(GNR_QUERY_G2_UTF8);
if (dn != NULL)
search_request_listener_emit(QUERY_STRING, dn, n->addr, n->port);
if (!search_is_valid(n, 0, &sri))
goto done;
/*
* Perform the query.
*/
sri.g2_query = TRUE;
sri.partials = booleanize(iflags & G2_Q2_F_PFS);
sri.g2_wants_url = booleanize(iflags & G2_Q2_F_URL);
sri.g2_wants_alt = booleanize(iflags & G2_Q2_F_A);
sri.g2_wants_dn = booleanize(iflags & G2_Q2_F_DN);
search_request(n, &sri, NULL);
done:
HFREE_NULL(dn);
HFREE_NULL(md);
}
void CServer::handle_request(const char *request)
{
const char *p;
int cmd_len;
int ok;
logger->log(3, "Got request: %s", request);
p = strchr(request,' ');
if (p == 0) {
p = request + strlen(request);
}
cmd_len = p - request;
while (*p == ' ') {
p++;
}
ok = 0;
if (cmd_len == 0) {
logger->log(2, "Empty request!");
return;
}
char *command = new char[cmd_len+1];
memcpy(command, request, cmd_len);
command[cmd_len] = 0;
try {
if (strcmp(command, "SEARCH") == 0) {
ok = 1;
search_request(p);
}
if (strcmp(command, "COUNT") == 0) {
ok = 1;
count_request();
}
if (strcmp(command, "DELETEHOST") == 0) {
ok = 1;
delete_request(p);
}
if (strcmp(command, "LOAD") == 0) {
ok = 1;
load_request(p);
}
if (strcmp(command, "STATUS") == 0) {
ok = 1;
status_request();
}
if (strcmp(command, "HOSTINFO") == 0) {
ok = 1;
host_info_request(p);
}
if (strcmp(command, "HOSTSTAT") == 0) {
ok = 1;
host_stat_request(p);
}
if (strcmp(command, "CACHEINFO") == 0) {
ok = 1;
cache_info_request();
}
if (strcmp(command, "UPDATEHOSTS") == 0) {
ok = 1;
update_hosts_request(p);
}
if (strcmp(command, "SERVERSTAT") == 0) {
ok = 1;
server_stat_request();
}
if (strcmp(command, "DEBUG") == 0) {
ok = 1;
debug_request(p);
}
if (strcmp(command, "DUMP") == 0) {
ok = 1;
dump_state_request();
}
if (strcmp(command, "FULLSCAN") == 0) {
ok = 1;
enable_full_request(p);
}
if (strcmp(command, "WORDORDER") == 0) {
ok = 1;
word_order_request();
}
if (strcmp(command, "CLEARPAGECACHE") == 0) {
ok = 1;
clear_pagecache_request();
}
if (strcmp(command, "CLEARQUERYCACHE") == 0) {
ok = 1;
clear_querycache_request();
}
if (strcmp(command, "DUMPFILES") == 0) {
ok = 1;
dump_files_request(p);
}
if (strcmp(command, "DUMPINDEX") == 0) {
ok = 1;
dump_index_request(p);
}
if (!ok) {
throw std::runtime_error(std::string("Unrecognized request: ") + request);
}
}
catch (std::runtime_error &e) {
logger->log(1, "Error: %s", e.what());
send_string("ERROR");
}
delete[] command;
m_request_count++;
}
