/**
* Encrypt a block with the supplied key.
*
* @param res where result is stored
* @param key the encryption key
* @param value the value to encrypt
*/
static void G_HOT
t_encrypt(tea_block_t *res, const tea_key_t *key, const tea_block_t *value)
{
uint32 v0, v1, sum = 0;
int i;
uint32 delta = TEA_CONSTANT;
uint32 k0, k1, k2, k3; /* cache key */
v0 = peek_le32(&value->v[0]);
v1 = peek_le32(&value->v[4]);
k0 = peek_le32(&key->v[0]);
k1 = peek_le32(&key->v[4]);
k2 = peek_le32(&key->v[8]);
k3 = peek_le32(&key->v[12]);
#define TEA_ROUND_ESTEP \
sum += delta; \
v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1); \
v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
for (i = 0; i < TEA_ROUNDS / 4; i++) {
TEA_ROUND_ESTEP;
TEA_ROUND_ESTEP;
TEA_ROUND_ESTEP;
TEA_ROUND_ESTEP;
}
poke_le32(&res->v[0], v0);
poke_le32(&res->v[4], v1);
}
/**
* Build a Local Node Info message.
*
* @return a /LNI message.
*/
pmsg_t *
g2_build_lni(void)
{
g2_tree_t *t;
pmsg_t *mb;
t = g2_tree_alloc_empty(G2_NAME(LNI));
/* LS -- library statistics */
{
uint32 files, kbytes;
char payload[8];
void *p = payload;
g2_tree_t *c;
files = MIN(shared_files_scanned(), ~((uint32) 0U));
kbytes = MIN(shared_kbytes_scanned(), ~((uint32) 0U));
p = poke_le32(p, files);
p = poke_le32(p, kbytes);
c = g2_tree_alloc_copy("LS", payload, sizeof payload);
g2_tree_add_child(t, c);
}
g2_build_add_firewalled(t); /* FW -- whether servent is firewalled */
g2_build_add_uptime(t); /* UP -- servent uptime */
g2_build_add_vendor(t); /* V -- vendor code */
g2_build_add_guid(t); /* GU -- the GUID of this node */
g2_build_add_node_address(t); /* NA -- the IP:port of this node */
g2_build_add_tls(t); /* TLS -- whether TLS is supported */
mb = g2_build_pmsg(t);
g2_tree_free_null(&t);
return mb;
}
/**
* Build a QHT RESET message.
*
* @param slots amount of slots in the table (power of 2)
* @param inf_val infinity value (1)
*
* @return a /QHT message with a RESET payload.
*/
pmsg_t *
g2_build_qht_reset(int slots, int inf_val)
{
g2_tree_t *t;
char body[6];
void *p = &body[0];
pmsg_t *mb;
g_assert(is_pow2(slots));
g_assert(1 == inf_val); /* Only 1-bit patches in G2 */
p = poke_u8(p, G2_QHT_RESET);
p = poke_le32(p, slots);
p = poke_u8(p, inf_val);
t = g2_tree_alloc(G2_NAME(QHT), body, sizeof body);
mb = g2_build_pmsg(t);
g2_tree_free_null(&t);
return mb;
}
/**
* Add file to the current query hit.
*
* @return TRUE if we kept the file, FALSE if we did not include it in the hit.
*/
static bool
g2_build_qh2_add(struct g2_qh2_builder *ctx, const shared_file_t *sf)
{
const sha1_t *sha1;
g2_tree_t *h, *c;
shared_file_check(sf);
/*
* Make sure the file is still in the library.
*/
if (0 == shared_file_index(sf))
return FALSE;
/*
* On G2, the H/URN child is required, meaning we need the SHA1 at least.
*/
if (!sha1_hash_available(sf))
return FALSE;
/*
* Do not send duplicates, as determined by the SHA1 of the resource.
*
* A user may share several files with different names but the same SHA1,
* and if all of them are hits, we only want to send one instance.
*
* When generating hits for host-browsing, we do not care about duplicates
* and ctx->hs is NULL then.
*/
sha1 = shared_file_sha1(sf); /* This is an atom */
if (ctx->hs != NULL) {
if (hset_contains(ctx->hs, sha1))
return FALSE;
hset_insert(ctx->hs, sha1);
}
/*
* Create the "H" child and attach it to the current tree.
*/
if (NULL == ctx->t)
g2_build_qh2_start(ctx);
h = g2_tree_alloc_empty("H");
g2_tree_add_child(ctx->t, h);
/*
* URN -- Universal Resource Name
*
* If there is a known TTH, then we can generate a bitprint, otherwise
* we just convey the SHA1.
*/
{
const tth_t * const tth = shared_file_tth(sf);
char payload[SHA1_RAW_SIZE + TTH_RAW_SIZE + sizeof G2_URN_BITPRINT];
char *p = payload;
if (NULL == tth) {
p = mempcpy(p, G2_URN_SHA1, sizeof G2_URN_SHA1);
p += clamp_memcpy(p, sizeof payload - ptr_diff(p, payload),
sha1, SHA1_RAW_SIZE);
} else {
p = mempcpy(p, G2_URN_BITPRINT, sizeof G2_URN_BITPRINT);
p += clamp_memcpy(p, sizeof payload - ptr_diff(p, payload),
sha1, SHA1_RAW_SIZE);
p += clamp_memcpy(p, sizeof payload - ptr_diff(p, payload),
tth, TTH_RAW_SIZE);
}
g_assert(ptr_diff(p, payload) <= sizeof payload);
c = g2_tree_alloc_copy("URN", payload, ptr_diff(p, payload));
g2_tree_add_child(h, c);
}
/*
* URL -- empty to indicate that we share the file via uri-res.
*/
if (ctx->flags & QHIT_F_G2_URL) {
uint known;
uint16 csc;
c = g2_tree_alloc_empty("URL");
g2_tree_add_child(h, c);
/*
* CSC -- if we know alternate sources, indicate how many in "CSC".
*
* This child is only emitted when they requested "URL".
*/
known = dmesh_count(sha1);
csc = MIN(known, MAX_INT_VAL(uint16));
if (csc != 0) {
char payload[2];
poke_le16(payload, csc);
c = g2_tree_alloc_copy("CSC", payload, sizeof payload);
g2_tree_add_child(h, c);
}
/*
* PART -- if we only have a partial file, indicate how much we have.
*
* This child is only emitted when they requested "URL".
*/
if (shared_file_is_partial(sf) && !shared_file_is_finished(sf)) {
filesize_t available = shared_file_available(sf);
char payload[8]; /* If we have to encode file size as 64-bit */
uint32 av32;
time_t mtime = shared_file_modification_time(sf);
c = g2_tree_alloc_empty("PART");
g2_tree_add_child(h, c);
av32 = available;
if (av32 == available) {
/* Fits within a 32-bit quantity */
poke_le32(payload, av32);
g2_tree_set_payload(c, payload, sizeof av32, TRUE);
} else {
/* Encode as a 64-bit quantity then */
poke_le64(payload, available);
g2_tree_set_payload(c, payload, sizeof payload, TRUE);
}
/*
* GTKG extension: encode the last modification time of the
* partial file in an "MT" child. This lets the other party
* determine whether the host is still able to actively complete
* the file.
*/
poke_le32(payload, (uint32) mtime);
g2_tree_add_child(c,
g2_tree_alloc_copy("MT", payload, sizeof(uint32)));
}
/*
* CT -- creation time of the resource (GTKG extension).
*/
{
time_t create_time = shared_file_creation_time(sf);
if ((time_t) -1 != create_time) {
char payload[8];
int n;
create_time = MAX(0, create_time);
n = vlint_encode(create_time, payload);
g2_tree_add_child(h,
g2_tree_alloc_copy("CT", payload, n)); /* No trailing 0s */
}
}
}
/*
* DN -- distinguished name.
*
* Note that the presence of DN also governs the presence of SZ if the
* file length does not fit a 32-bit unsigned quantity.
*/
if (ctx->flags & QHIT_F_G2_DN) {
char payload[8]; /* If we have to encode file size as 64-bit */
uint32 fs32;
filesize_t fs = shared_file_size(sf);
const char *name;
const char *rp;
c = g2_tree_alloc_empty("DN");
fs32 = fs;
if (fs32 == fs) {
/* Fits within a 32-bit quantity */
poke_le32(payload, fs32);
g2_tree_set_payload(c, payload, sizeof fs32, TRUE);
} else {
/* Does not fit a 32-bit quantity, emit a SZ child */
poke_le64(payload, fs);
g2_tree_add_child(h,
g2_tree_alloc_copy("SZ", payload, sizeof payload));
}
name = shared_file_name_nfc(sf);
g2_tree_append_payload(c, name, shared_file_name_nfc_len(sf));
g2_tree_add_child(h, c);
/*
* GTKG extension: if there is a file path, expose it as a "P" child
* under the DN node.
*/
rp = shared_file_relative_path(sf);
if (rp != NULL) {
g2_tree_add_child(c, g2_tree_alloc_copy("P", rp, strlen(rp)));
}
}
/*
* GTKG extension: if they requested alt-locs in the /Q2/I with "A", then
* send them some known alt-locs in an "ALT" child.
*
* Note that these alt-locs can be for Gnutella hosts: since both Gnutella
* and G2 share a common HTTP-based file transfer mechanism with compatible
* extra headers, there is no need to handle them separately.
*/
if (ctx->flags & QHIT_F_G2_ALT) {
gnet_host_t hvec[G2_BUILD_QH2_MAX_ALT];
int hcnt = 0;
hcnt = dmesh_fill_alternate(sha1, hvec, N_ITEMS(hvec));
if (hcnt > 0) {
int i;
c = g2_tree_alloc_empty("ALT");
for (i = 0; i < hcnt; i++) {
host_addr_t addr;
uint16 port;
addr = gnet_host_get_addr(&hvec[i]);
port = gnet_host_get_port(&hvec[i]);
if (host_addr_is_ipv4(addr)) {
char payload[6];
host_ip_port_poke(payload, addr, port, NULL);
g2_tree_append_payload(c, payload, sizeof payload);
}
}
/*
* If the payload is still empty, then drop the "ALT" child.
* Otherwise, attach it to the "H" node.
*/
if (NULL == g2_tree_node_payload(c, NULL)) {
g2_tree_free_null(&c);
} else {
g2_tree_add_child(h, c);
}
}
}
/*
* Update the size of the query hit we're generating.
*/
ctx->current_size += g2_frame_serialize(h, NULL, 0);
return TRUE;
}
/**
* Close the layer, flushing all the data there is.
* Once this is done, invoke the supplied callback.
*/
static void
tx_deflate_close(txdrv_t *tx, tx_closed_t cb, void *arg)
{
struct attr *attr = tx->opaque;
g_assert(tx->flags & TX_CLOSING);
if (tx_deflate_debugging(9)) {
g_debug("TX %s: (%s) send=%d buffer #%d, nagle %s, "
"unflushed %zu) [%c%c]", G_STRFUNC,
gnet_host_to_string(&tx->host), attr->send_idx, attr->fill_idx,
(attr->flags & DF_NAGLE) ? "on" : "off", attr->unflushed,
(attr->flags & DF_FLOWC) ? 'C' : '-',
(attr->flags & DF_FLUSH) ? 'f' : '-');
}
/*
* Flush whatever we can.
*/
tx_deflate_flush(tx);
if (attr->gzip.enabled && 0 == tx_deflate_pending(tx)) {
/* See RFC 1952 - GZIP file format specification version 4.3 */
struct buffer *b;
uint32 trailer[2]; /* 0: CRC32, 1: SIZE % (1 << 32) */
/* We don't want to send the trailer more than once */
attr->gzip.enabled = FALSE;
attr->send_idx = 0;
b = &attr->buf[attr->send_idx];
poke_le32(&trailer[0], (uint32) attr->gzip.crc);
poke_le32(&trailer[1], attr->gzip.size);
g_assert(sizeof trailer <= (size_t) (b->end - b->wptr));
b->wptr = mempcpy(b->wptr, trailer, sizeof trailer);
deflate_send(tx);
}
if (0 == tx_deflate_pending(tx)) {
if (tx_deflate_debugging(9)) {
g_debug("TX %s: flushed everything immediately", G_STRFUNC);
}
(*cb)(tx, arg);
return;
}
/*
* We were unable to flush everything.
*/
attr->closed = cb;
attr->closed_arg = arg;
if (tx_deflate_debugging(9)) {
g_debug("TX %s: (%s) delayed! send=%d buffer #%d, nagle %s, "
"flushed %zu, unflushed %zu) [%c%c]",
G_STRFUNC, gnet_host_to_string(&tx->host),
attr->send_idx, attr->fill_idx,
(attr->flags & DF_NAGLE) ? "on" : "off",
attr->flushed, attr->unflushed,
(attr->flags & DF_FLOWC) ? 'C' : '-',
(attr->flags & DF_FLUSH) ? 'f' : '-');
}
}
