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lightningd: forward onion messages.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-04-01 14:23:22 +10:30
parent dd690553b8
commit f7fe8a952d
4 changed files with 109 additions and 3 deletions
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1
lightningd/Makefile
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@ -75,6 +75,7 @@ LIGHTNINGD_SRC := \
lightningd/channel_control.c \
lightningd/closing_control.c \
lightningd/connect_control.c \
lightningd/onion_message.c \
lightningd/gossip_control.c \
lightningd/gossip_msg.c \
lightningd/hsm_control.c \

13
lightningd/channel_control.c
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@ -21,6 +21,7 @@
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/onion_message.h>
#include <lightningd/peer_control.h>
#include <lightningd/subd.h>
#include <wire/gen_common_wire.h>
@ -319,11 +320,17 @@ static unsigned channel_msg(struct subd *sd, const u8 *msg, const int *fds)
case WIRE_CHANNEL_SEND_ERROR_REPLY:
handle_error_channel(sd->channel, msg);
break;
#if EXPERIMENTAL_FEATURES
case WIRE_GOT_ONIONMSG_TO_US:
handle_onionmsg_to_us(sd->channel, msg);
break;
case WIRE_GOT_ONIONMSG_FORWARD:
handle_onionmsg_forward(sd->channel, msg);
break;
#else
case WIRE_GOT_ONIONMSG_TO_US:
case WIRE_GOT_ONIONMSG_FORWARD:
/* FIXME */
break;
#endif
/* And we never get these from channeld. */
case WIRE_CHANNEL_INIT:
case WIRE_CHANNEL_FUNDING_DEPTH:

87
lightningd/onion_message.c Normal file
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@ -0,0 +1,87 @@
#include <channeld/gen_channel_wire.h>
#include <lightningd/channel.h>
#include <lightningd/lightningd.h>
#include <lightningd/onion_message.h>
#include <lightningd/peer_control.h>
#include <lightningd/subd.h>
#if EXPERIMENTAL_FEATURES
/* Returns false if we can't tell it */
static bool make_peer_send(struct lightningd *ld,
struct channel *dst, const u8 *msg TAKES)
{
/* Take ownership of msg (noop if it's taken) */
msg = tal_dup_talarr(tmpctx, u8, msg);
if (!dst) {
log_debug(ld->log, "Can't send %s: no channel",
channel_wire_type_name(fromwire_peektype(msg)));
return false;
}
if (!dst->owner) {
log_debug(ld->log, "Can't send %s: not connected",
channel_wire_type_name(fromwire_peektype(msg)));
return false;
}
/* FIXME: We should allow this for closingd too, and we should
* allow incoming via openingd!. */
if (!streq(dst->owner->name, "channeld")) {
log_debug(ld->log, "Can't send %s: owned by %s",
channel_wire_type_name(fromwire_peektype(msg)),
dst->owner->name);
return false;
}
subd_send_msg(dst->owner, take(msg));
return true;
}
void handle_onionmsg_to_us(struct channel *channel, const u8 *msg)
{
struct pubkey *reply_blinding;
struct onionmsg_path **reply_path;
if (!fromwire_got_onionmsg_to_us(msg, msg,
&reply_blinding, &reply_path)) {
channel_internal_error(channel, "bad got_onionmsg_tous: %s",
tal_hex(tmpctx, msg));
return;
}
log_info(channel->log, "Got onionmsg%s%s",
reply_blinding ? " reply_blinding": "",
reply_path ? " reply_path": "");
}
void handle_onionmsg_forward(struct channel *channel, const u8 *msg)
{
struct lightningd *ld = channel->peer->ld;
struct short_channel_id *next_scid;
struct node_id *next_node;
struct pubkey *next_blinding;
u8 onion[TOTAL_PACKET_SIZE];
struct channel *outchan;
if (!fromwire_got_onionmsg_forward(msg, msg, &next_scid, &next_node,
&next_blinding, onion)) {
channel_internal_error(channel, "bad got_onionmsg_forward: %s",
tal_hex(tmpctx, msg));
return;
}
if (next_scid)
outchan = active_channel_by_scid(ld, next_scid);
else if (next_node) {
struct peer *p = peer_by_id(ld, next_node);
if (p)
outchan = peer_active_channel(p);
else
outchan = NULL;
} else
outchan = NULL;
make_peer_send(ld, outchan,
take(towire_send_onionmsg(NULL, onion, next_blinding)));
}
#endif /* EXPERIMENTAL_FEATURES */

11
lightningd/onion_message.h Normal file
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@ -0,0 +1,11 @@
#ifndef LIGHTNING_LIGHTNINGD_ONION_MESSAGE_H
#define LIGHTNING_LIGHTNINGD_ONION_MESSAGE_H
#include "config.h"
#include <ccan/short_types/short_types.h>
struct channel;
void handle_onionmsg_to_us(struct channel *channel, const u8 *msg);
void handle_onionmsg_forward(struct channel *channel, const u8 *msg);
#endif /* LIGHTNING_LIGHTNINGD_ONION_MESSAGE_H */