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#include <assert.h>
#include <ccan/fdpass/fdpass.h>
#include <common/crypto_sync.h>
#include <common/gossip_rcvd_filter.h>
#include <common/gossip_store.h>
#include <common/peer_failed.h>
#include <common/per_peer_state.h>
#include <common/read_peer_msg.h>
#include <common/status.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#include <common/wire_error.h>
#include <errno.h>
#include <gossipd/gen_gossip_peerd_wire.h>
#include <sys/select.h>
#include <unistd.h>
#include <wire/peer_wire.h>
#include <wire/wire_sync.h>
u8 *peer_or_gossip_sync_read(const tal_t *ctx,
struct per_peer_state *pps,
bool *from_gossipd)
{
fd_set readfds;
u8 *msg;
for (;;) {
struct timeval tv, *tptr;
struct timerel trel;
if (time_to_next_gossip(pps, &trel)) {
tv = timerel_to_timeval(trel);
tptr = &tv;
} else
tptr = NULL;
FD_ZERO(&readfds);
FD_SET(pps->peer_fd, &readfds);
FD_SET(pps->gossip_fd, &readfds);
if (select(pps->peer_fd > pps->gossip_fd
? pps->peer_fd + 1 : pps->gossip_fd + 1,
&readfds, NULL, NULL, tptr) != 0)
break;
/* We timed out; look in gossip_store. Failure resets timer. */
msg = gossip_store_next(tmpctx, pps);
if (msg) {
*from_gossipd = true;
return msg;
}
}
if (FD_ISSET(pps->peer_fd, &readfds)) {
msg = sync_crypto_read(ctx, pps);
*from_gossipd = false;
return msg;
}
msg = wire_sync_read(ctx, pps->gossip_fd);
if (!msg)
status_failed(STATUS_FAIL_GOSSIP_IO,
"Error reading gossip msg: %s",
strerror(errno));
*from_gossipd = true;
return msg;
}
bool is_peer_error(const tal_t *ctx, const u8 *msg,
const struct channel_id *channel_id,
char **desc, bool *all_channels)
{
struct channel_id err_chanid;
if (fromwire_peektype(msg) != WIRE_ERROR)
return false;
*desc = sanitize_error(ctx, msg, &err_chanid);
/* BOLT #1:
*
* The channel is referred to by `channel_id`, unless `channel_id` is
* 0 (i.e. all bytes are 0), in which case it refers to all channels.
* ...
* The receiving node:
* - upon receiving `error`:
* - MUST fail the channel referred to by the error message, if that
* channel is with the sending node.
* - if no existing channel is referred to by the message:
* - MUST ignore the message.
*/
*all_channels = channel_id_is_all(&err_chanid);
if (!*all_channels && !channel_id_eq(&err_chanid, channel_id))
*desc = tal_free(*desc);
return true;
}
bool is_wrong_channel(const u8 *msg, const struct channel_id *expected,
struct channel_id *actual)
{
if (!extract_channel_id(msg, actual))
return false;
return !channel_id_eq(expected, actual);
}
void handle_gossip_msg(struct per_peer_state *pps, const u8 *msg TAKES)
{
u8 *gossip;
u64 offset_shorter;
if (fromwire_gossipd_new_store_fd(msg, &offset_shorter)) {
gossip_store_switch_fd(pps, fdpass_recv(pps->gossip_fd),
offset_shorter);
goto out;
} else
/* It's a raw gossip msg: this copies or takes() */
gossip = tal_dup_arr(tmpctx, u8, msg, tal_bytelen(msg), 0);
/* Gossipd can send us gossip messages, OR errors */
if (fromwire_peektype(gossip) == WIRE_ERROR) {
sync_crypto_write(pps, gossip);
peer_failed_connection_lost();
} else {
sync_crypto_write(pps, gossip);
}
out:
if (taken(msg))
tal_free(msg);
}
/* takes iff returns true */
bool handle_timestamp_filter(struct per_peer_state *pps, const u8 *msg TAKES)
{
struct bitcoin_blkid chain_hash; /* FIXME: don't ignore! */
u32 first_timestamp, timestamp_range;
if (!fromwire_gossip_timestamp_filter(msg, &chain_hash,
&first_timestamp,
&timestamp_range)) {
return false;
}
gossip_setup_timestamp_filter(pps, first_timestamp, timestamp_range);
return true;
}
bool handle_peer_gossip_or_error(struct per_peer_state *pps,
const struct channel_id *channel_id,
bool soft_error,
const u8 *msg TAKES)
{
char *err;
bool all_channels;
struct channel_id actual;
#if DEVELOPER
/* Any odd-typed unknown message is handled by the caller, so if we
* find one here it's an error. */
assert(!is_unknown_msg_discardable(msg));
#else
/* BOLT #1:
*
* A receiving node:
* - upon receiving a message of _odd_, unknown type:
* - MUST ignore the received message.
*/
if (is_unknown_msg_discardable(msg))
goto handled;
#endif
if (handle_timestamp_filter(pps, msg))
return true;
else if (is_msg_for_gossipd(msg)) {
gossip_rcvd_filter_add(pps->grf, msg);
wire_sync_write(pps->gossip_fd, msg);
/* wire_sync_write takes, so don't take again. */
return true;
}
if (is_peer_error(tmpctx, msg, channel_id, &err, &all_channels)) {
if (err)
peer_failed_received_errmsg(pps, err,
all_channels
? NULL : channel_id,
soft_error);
/* Ignore unknown channel errors. */
goto handled;
}
/* They're talking about a different channel? */
if (is_wrong_channel(msg, channel_id, &actual)) {
status_debug("Rejecting %s for unknown channel_id %s",
wire_type_name(fromwire_peektype(msg)),
type_to_string(tmpctx, struct channel_id, &actual));
sync_crypto_write(pps,
take(towire_errorfmt(NULL, &actual,
"Multiple channels"
" unsupported")));
goto handled;
}
return false;
handled:
if (taken(msg))
tal_free(msg);
return true;
}