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fetchinvoice.c
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fetchinvoice.c
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#include "config.h"
#include <bitcoin/chainparams.h>
#include <ccan/array_size/array_size.h>
#include <ccan/cast/cast.h>
#include <ccan/json_out/json_out.h>
#include <ccan/mem/mem.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <common/blindedpath.h>
#include <common/bolt12_merkle.h>
#include <common/dijkstra.h>
#include <common/gossmap.h>
#include <common/json_stream.h>
#include <common/json_tok.h>
#include <common/memleak.h>
#include <common/overflows.h>
#include <common/route.h>
#include <common/type_to_string.h>
#include <errno.h>
#include <plugins/libplugin.h>
#include <secp256k1_schnorrsig.h>
#include <sodium.h>
static struct gossmap *global_gossmap;
static struct pubkey local_id;
static bool disable_connect = false;
static LIST_HEAD(sent_list);
struct sent {
/* We're in sent_invreqs, awaiting reply. */
struct list_node list;
/* The alias used by reply */
struct pubkey *reply_alias;
/* The command which sent us. */
struct command *cmd;
/* The offer we are trying to get an invoice/payment for. */
struct tlv_offer *offer;
/* Path to use (including self) */
struct pubkey *path;
/* The invreq we sent, OR the invoice we sent */
struct tlv_invoice_request *invreq;
struct tlv_invoice *inv;
struct preimage inv_preimage;
struct json_escape *inv_label;
/* How long to wait for response before giving up. */
u32 wait_timeout;
};
static struct sent *find_sent_by_alias(const struct pubkey *alias)
{
struct sent *i;
list_for_each(&sent_list, i, list) {
if (i->reply_alias && pubkey_eq(i->reply_alias, alias))
return i;
}
return NULL;
}
static const char *field_diff_(struct plugin *plugin,
const tal_t *a, const tal_t *b,
const char *fieldname)
{
/* One is set and the other isn't? */
if ((a == NULL) != (b == NULL)) {
plugin_log(plugin, LOG_DBG, "field_diff %s: a is %s, b is %s",
fieldname, a ? "set": "unset", b ? "set": "unset");
return fieldname;
}
if (!memeq(a, tal_bytelen(a), b, tal_bytelen(b))) {
plugin_log(plugin, LOG_DBG, "field_diff %s: a=%s, b=%s",
fieldname, tal_hex(tmpctx, a), tal_hex(tmpctx, b));
return fieldname;
}
return NULL;
}
#define field_diff(a, b, fieldname) \
field_diff_((cmd)->plugin, a->fieldname, b->fieldname, #fieldname)
/* Returns true if b is a with something appended. */
static bool description_is_appended(const char *a, const char *b)
{
if (!a || !b)
return false;
if (tal_bytelen(b) < tal_bytelen(a))
return false;
return memeq(a, tal_bytelen(a), b, tal_bytelen(a));
}
/* Hack to suppress warnings when we finish a different command */
static void discard_result(struct command_result *ret)
{
}
/* Returns NULL if it wasn't an error. */
static struct command_result *handle_error(struct command *cmd,
struct sent *sent,
const char *buf,
const jsmntok_t *om)
{
const u8 *data;
size_t dlen;
struct tlv_invoice_error *err;
struct json_out *details;
const jsmntok_t *errtok;
errtok = json_get_member(buf, om, "invoice_error");
if (!errtok)
return NULL;
data = json_tok_bin_from_hex(cmd, buf, errtok);
dlen = tal_bytelen(data);
details = json_out_new(cmd);
plugin_log(cmd->plugin, LOG_DBG, "errtok = %.*s",
json_tok_full_len(errtok),
json_tok_full(buf, errtok));
json_out_start(details, NULL, '{');
err = fromwire_tlv_invoice_error(cmd, &data, &dlen);
if (!err) {
plugin_log(cmd->plugin, LOG_DBG,
"Invalid invoice_error %.*s",
json_tok_full_len(errtok),
json_tok_full(buf, errtok));
json_out_addstr(details, "invoice_error_hex",
tal_strndup(tmpctx,
buf + errtok->start,
errtok->end - errtok->start));
} else {
char *failstr;
/* FIXME: with a bit more generate-wire.py support,
* we could have fieldnames and even types. */
if (err->erroneous_field)
json_out_add(details, "erroneous_field", false,
"%"PRIu64, *err->erroneous_field);
if (err->suggested_value)
json_out_addstr(details, "suggested_value",
tal_hex(tmpctx,
err->suggested_value));
/* If they don't include this, it'll be empty */
failstr = tal_strndup(tmpctx,
err->error,
tal_bytelen(err->error));
json_out_addstr(details, "error", failstr);
}
json_out_end(details, '}');
discard_result(command_done_err(sent->cmd,
OFFER_BAD_INVREQ_REPLY,
"Remote node sent failure message",
details));
return command_hook_success(cmd);
}
static struct command_result *handle_invreq_response(struct command *cmd,
struct sent *sent,
const char *buf,
const jsmntok_t *om)
{
const u8 *invbin;
const jsmntok_t *invtok;
size_t len;
struct tlv_invoice *inv;
struct sha256 merkle, sighash;
struct json_stream *out;
const char *badfield;
u64 *expected_amount;
invtok = json_get_member(buf, om, "invoice");
if (!invtok) {
plugin_log(cmd->plugin, LOG_UNUSUAL,
"Neither invoice nor invoice_request_failed in reply %.*s",
json_tok_full_len(om),
json_tok_full(buf, om));
discard_result(command_fail(sent->cmd,
OFFER_BAD_INVREQ_REPLY,
"Neither invoice nor invoice_request_failed in reply %.*s",
json_tok_full_len(om),
json_tok_full(buf, om)));
return command_hook_success(cmd);
}
invbin = json_tok_bin_from_hex(cmd, buf, invtok);
len = tal_bytelen(invbin);
inv = fromwire_tlv_invoice(cmd, &invbin, &len);
if (!inv) {
badfield = "invoice";
goto badinv;
}
#if DEVELOPER
/* Raw send? Just fwd reply. */
if (!sent->offer) {
out = jsonrpc_stream_success(sent->cmd);
json_add_string(out, "invoice", invoice_encode(tmpctx, inv));
discard_result(command_finished(sent->cmd, out));
return command_hook_success(cmd);
}
#endif /* DEVELOPER */
/* BOLT-offers #12:
* - MUST reject the invoice unless `node_id` is equal to the offer.
*/
if (!point32_eq(sent->offer->node_id, inv->node_id)) {
badfield = "node_id";
goto badinv;
}
/* BOLT-offers #12:
* - MUST reject the invoice if `signature` is not a valid signature
* using `node_id` as described in [Signature Calculation]
*/
merkle_tlv(inv->fields, &merkle);
sighash_from_merkle("invoice", "signature", &merkle, &sighash);
if (!inv->signature
|| secp256k1_schnorrsig_verify(secp256k1_ctx, inv->signature->u8,
sighash.u.u8, &inv->node_id->pubkey) != 1) {
badfield = "signature";
goto badinv;
}
/* BOLT-offers #12:
* - MUST reject the invoice if `msat` is not present.
*/
if (!inv->amount) {
badfield = "amount";
goto badinv;
}
/* BOLT-offers #12:
* - MUST reject the invoice unless `offer_id` is equal to the id of the
* offer.
*/
if ((badfield = field_diff(sent->invreq, inv, offer_id)))
goto badinv;
/* BOLT-offers #12:
* - if the invoice is a reply to an `invoice_request`:
*...
* - MUST reject the invoice unless the following fields are equal or
* unset exactly as they are in the `invoice_request:`
* - `quantity`
* - `payer_key`
* - `payer_info`
*/
/* BOLT-offers-recurrence #12:
* - if the invoice is a reply to an `invoice_request`:
*...
* - MUST reject the invoice unless the following fields are equal or
* unset exactly as they are in the `invoice_request:`
* - `quantity`
* - `recurrence_counter`
* - `recurrence_start`
* - `payer_key`
* - `payer_info`
*/
if ((badfield = field_diff(sent->invreq, inv, quantity)))
goto badinv;
if ((badfield = field_diff(sent->invreq, inv, recurrence_counter)))
goto badinv;
if ((badfield = field_diff(sent->invreq, inv, recurrence_start)))
goto badinv;
if ((badfield = field_diff(sent->invreq, inv, payer_key)))
goto badinv;
if ((badfield = field_diff(sent->invreq, inv, payer_info)))
goto badinv;
/* Get the amount we expected: firstly, if that's what we sent,
* secondly, if specified in the invoice. */
if (sent->invreq->amount) {
expected_amount = tal_dup(tmpctx, u64, sent->invreq->amount);
} else if (sent->offer->amount && !sent->offer->currency) {
expected_amount = tal(tmpctx, u64);
*expected_amount = *sent->offer->amount;
if (sent->invreq->quantity) {
/* We should never have sent this! */
if (mul_overflows_u64(*expected_amount,
*sent->invreq->quantity)) {
badfield = "quantity overflow";
goto badinv;
}
*expected_amount *= *sent->invreq->quantity;
}
} else
expected_amount = NULL;
/* BOLT-offers-recurrence #12:
* - if the offer contained `recurrence`:
* - MUST reject the invoice if `recurrence_basetime` is not set.
*/
if (sent->invreq->recurrence_counter && !inv->recurrence_basetime) {
badfield = "recurrence_basetime";
goto badinv;
}
/* BOLT-offers #12:
* - SHOULD confirm authorization if the `description` does not exactly
* match the `offer`
* - MAY highlight if `description` has simply had a change appended.
*/
/* We highlight these changes to the caller, for them to handle */
out = jsonrpc_stream_success(sent->cmd);
json_add_string(out, "invoice", invoice_encode(tmpctx, inv));
json_object_start(out, "changes");
if (field_diff(sent->offer, inv, description)) {
/* Did they simply append? */
if (description_is_appended(sent->offer->description,
inv->description)) {
size_t off = tal_bytelen(sent->offer->description);
json_add_stringn(out, "description_appended",
inv->description + off,
tal_bytelen(inv->description) - off);
} else if (!inv->description)
json_add_stringn(out, "description_removed",
sent->offer->description,
tal_bytelen(sent->offer->description));
else
json_add_stringn(out, "description",
inv->description,
tal_bytelen(inv->description));
}
/* BOLT-offers #12:
* - SHOULD confirm authorization if `issuer` does not exactly
* match the `offer`
*/
if (field_diff(sent->offer, inv, issuer)) {
if (!inv->issuer)
json_add_stringn(out, "issuer_removed",
sent->offer->issuer,
tal_bytelen(sent->offer->issuer));
else
json_add_stringn(out, "issuer",
inv->issuer,
tal_bytelen(inv->issuer));
}
/* BOLT-offers #12:
* - SHOULD confirm authorization if `msat` is not within the amount
* range authorized.
*/
/* We always tell them this unless it's trivial to calc and
* exactly as expected. */
if (!expected_amount || *inv->amount != *expected_amount)
json_add_amount_msat_only(out, "msat",
amount_msat(*inv->amount));
json_object_end(out);
/* We tell them about next period at this point, if any. */
if (sent->offer->recurrence) {
u64 next_counter, next_period_idx;
u64 paywindow_start, paywindow_end;
next_counter = *sent->invreq->recurrence_counter + 1;
if (sent->invreq->recurrence_start)
next_period_idx = *sent->invreq->recurrence_start
+ next_counter;
else
next_period_idx = next_counter;
/* If this was the last, don't tell them about a next! */
if (!sent->offer->recurrence_limit
|| next_period_idx <= *sent->offer->recurrence_limit) {
json_object_start(out, "next_period");
json_add_u64(out, "counter", next_counter);
json_add_u64(out, "starttime",
offer_period_start(*inv->recurrence_basetime,
next_period_idx,
sent->offer->recurrence));
json_add_u64(out, "endtime",
offer_period_start(*inv->recurrence_basetime,
next_period_idx + 1,
sent->offer->recurrence) - 1);
offer_period_paywindow(sent->offer->recurrence,
sent->offer->recurrence_paywindow,
sent->offer->recurrence_base,
*inv->recurrence_basetime,
next_period_idx,
&paywindow_start, &paywindow_end);
json_add_u64(out, "paywindow_start", paywindow_start);
json_add_u64(out, "paywindow_end", paywindow_end);
json_object_end(out);
}
}
discard_result(command_finished(sent->cmd, out));
return command_hook_success(cmd);
badinv:
plugin_log(cmd->plugin, LOG_DBG, "Failed invoice due to %s", badfield);
discard_result(command_fail(sent->cmd,
OFFER_BAD_INVREQ_REPLY,
"Incorrect %s field in %.*s",
badfield,
json_tok_full_len(invtok),
json_tok_full(buf, invtok)));
return command_hook_success(cmd);
}
static struct command_result *recv_modern_onion_message(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
const jsmntok_t *om, *aliastok;
struct sent *sent;
struct pubkey alias;
struct command_result *err;
om = json_get_member(buf, params, "onion_message");
aliastok = json_get_member(buf, om, "our_alias");
if (!aliastok || !json_to_pubkey(buf, aliastok, &alias))
return command_hook_success(cmd);
sent = find_sent_by_alias(&alias);
if (!sent) {
plugin_log(cmd->plugin, LOG_DBG,
"No match for modern onion %.*s",
json_tok_full_len(om),
json_tok_full(buf, om));
return command_hook_success(cmd);
}
plugin_log(cmd->plugin, LOG_DBG, "Received modern onion message: %.*s",
json_tok_full_len(params),
json_tok_full(buf, params));
err = handle_error(cmd, sent, buf, om);
if (err)
return err;
if (sent->invreq)
return handle_invreq_response(cmd, sent, buf, om);
return command_hook_success(cmd);
}
static void destroy_sent(struct sent *sent)
{
list_del(&sent->list);
}
/* We've received neither a reply nor a payment; return failure. */
static void timeout_sent_invreq(struct sent *sent)
{
/* This will free sent! */
discard_result(command_fail(sent->cmd, OFFER_TIMEOUT,
"Timeout waiting for response"));
}
static struct command_result *sendonionmsg_done(struct command *cmd,
const char *buf UNUSED,
const jsmntok_t *result UNUSED,
struct sent *sent)
{
tal_steal(cmd, plugin_timer(cmd->plugin,
time_from_sec(sent->wait_timeout),
timeout_sent_invreq, sent));
sent->cmd = cmd;
list_add_tail(&sent_list, &sent->list);
tal_add_destructor(sent, destroy_sent);
return command_still_pending(cmd);
}
static void init_gossmap(struct plugin *plugin)
{
size_t num_cupdates_rejected;
global_gossmap
= notleak_with_children(gossmap_load(NULL,
GOSSIP_STORE_FILENAME,
&num_cupdates_rejected));
if (!global_gossmap)
plugin_err(plugin, "Could not load gossmap %s: %s",
GOSSIP_STORE_FILENAME, strerror(errno));
if (num_cupdates_rejected)
plugin_log(plugin, LOG_DBG,
"gossmap ignored %zu channel updates",
num_cupdates_rejected);
}
static struct gossmap *get_gossmap(struct plugin *plugin)
{
if (!global_gossmap)
init_gossmap(plugin);
else
gossmap_refresh(global_gossmap, NULL);
return global_gossmap;
}
static struct command_result *param_offer(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct tlv_offer **offer)
{
char *fail;
/* BOLT-offers #12:
* - if `features` contains unknown _odd_ bits that are non-zero:
* - MUST ignore the bit.
* - if `features` contains unknown _even_ bits that are non-zero:
* - MUST NOT respond to the offer.
* - SHOULD indicate the unknown bit to the user.
*/
/* BOLT-offers #12:
* - MUST NOT set or imply any `chain_hash` not set or implied by
* the offer.
*/
*offer = offer_decode(cmd, buffer + tok->start, tok->end - tok->start,
plugin_feature_set(cmd->plugin), chainparams,
&fail);
if (!*offer)
return command_fail_badparam(cmd, name, buffer, tok,
tal_fmt(cmd,
"Unparsable offer: %s",
fail));
/* BOLT-offers #12:
*
* - if `node_id` or `description` is not set:
* - MUST NOT respond to the offer.
*/
if (!(*offer)->node_id)
return command_fail_badparam(cmd, name, buffer, tok,
"Offer does not contain a node_id");
if (!(*offer)->description)
return command_fail_badparam(cmd, name, buffer, tok,
"Offer does not contain a description");
return NULL;
}
static bool can_carry_onionmsg(const struct gossmap *map,
const struct gossmap_chan *c,
int dir,
struct amount_msat amount UNUSED,
void *arg UNUSED)
{
const struct gossmap_node *n;
/* Don't use it if either side says it's disabled */
if (!c->half[dir].enabled || !c->half[!dir].enabled)
return false;
/* Check features of recipient */
n = gossmap_nth_node(map, c, !dir);
/* 102/103 was the old EXPERIMENTAL feature bit: remove soon! */
return gossmap_node_get_feature(map, n, OPT_ONION_MESSAGES) != -1
|| gossmap_node_get_feature(map, n, 102) != -1;
}
enum nodeid_parity {
nodeid_parity_even = SECP256K1_TAG_PUBKEY_EVEN,
nodeid_parity_odd = SECP256K1_TAG_PUBKEY_ODD,
nodeid_parity_unknown = 1,
};
static enum nodeid_parity node_parity(const struct gossmap *gossmap,
const struct gossmap_node *node)
{
struct node_id id;
gossmap_node_get_id(gossmap, node, &id);
return id.k[0];
}
static void node_id_from_point32(struct node_id *nid,
const struct point32 *node32_id,
enum nodeid_parity parity)
{
assert(parity == SECP256K1_TAG_PUBKEY_EVEN
|| parity == SECP256K1_TAG_PUBKEY_ODD);
nid->k[0] = parity;
secp256k1_xonly_pubkey_serialize(secp256k1_ctx, nid->k+1,
&node32_id->pubkey);
}
/* Create path to node which can carry onion messages (including
* self); if it can't find one, returns NULL. Fills in nodeid_parity
* for 33rd nodeid byte. */
static struct pubkey *path_to_node(const tal_t *ctx,
struct plugin *plugin,
const struct point32 *node32_id,
enum nodeid_parity *parity)
{
struct route_hop *r;
const struct dijkstra *dij;
const struct gossmap_node *src;
const struct gossmap_node *dst;
struct node_id dstid, local_nodeid;
struct pubkey *nodes;
struct gossmap *gossmap = get_gossmap(plugin);
/* We try both parities. */
*parity = nodeid_parity_even;
node_id_from_point32(&dstid, node32_id, *parity);
dst = gossmap_find_node(gossmap, &dstid);
if (!dst) {
*parity = nodeid_parity_odd;
node_id_from_point32(&dstid, node32_id, *parity);
dst = gossmap_find_node(gossmap, &dstid);
if (!dst) {
*parity = nodeid_parity_unknown;
return NULL;
}
}
*parity = node_parity(gossmap, dst);
/* If we don't exist in gossip, routing can't happen. */
node_id_from_pubkey(&local_nodeid, &local_id);
src = gossmap_find_node(gossmap, &local_nodeid);
if (!src)
return NULL;
dij = dijkstra(tmpctx, gossmap, dst, AMOUNT_MSAT(0), 0,
can_carry_onionmsg, route_score_shorter, NULL);
r = route_from_dijkstra(tmpctx, gossmap, dij, src, AMOUNT_MSAT(0), 0);
if (!r)
return NULL;
nodes = tal_arr(ctx, struct pubkey, tal_count(r) + 1);
nodes[0] = local_id;
for (size_t i = 0; i < tal_count(r); i++) {
if (!pubkey_from_node_id(&nodes[i+1], &r[i].node_id)) {
plugin_err(plugin, "Could not convert nodeid %s",
type_to_string(tmpctx, struct node_id,
&r[i].node_id));
}
}
return nodes;
}
/* Marshal arguments for sending onion messages */
struct sending {
struct sent *sent;
const char *msgfield;
const u8 *msgval;
struct tlv_obs2_onionmsg_payload_reply_path *obs2_reply_path;
struct command_result *(*done)(struct command *cmd,
const char *buf UNUSED,
const jsmntok_t *result UNUSED,
struct sent *sent);
};
static struct command_result *
send_obs2_message(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct sending *sending)
{
struct sent *sent = sending->sent;
struct privkey blinding_iter;
struct pubkey fwd_blinding, *node_alias;
size_t nhops = tal_count(sent->path);
struct tlv_obs2_onionmsg_payload **payloads;
struct out_req *req;
/* Now create enctlvs for *forward* path. */
randombytes_buf(&blinding_iter, sizeof(blinding_iter));
if (!pubkey_from_privkey(&blinding_iter, &fwd_blinding))
return command_fail(cmd, LIGHTNINGD,
"Could not convert blinding %s to pubkey!",
type_to_string(tmpctx, struct privkey,
&blinding_iter));
/* We overallocate: this node (0) doesn't have payload or alias */
payloads = tal_arr(cmd, struct tlv_obs2_onionmsg_payload *, nhops);
node_alias = tal_arr(cmd, struct pubkey, nhops);
for (size_t i = 1; i < nhops - 1; i++) {
payloads[i] = tlv_obs2_onionmsg_payload_new(payloads);
payloads[i]->enctlv = create_obs2_enctlv(payloads[i],
&blinding_iter,
&sent->path[i],
&sent->path[i+1],
/* FIXME: Pad? */
0,
NULL,
&blinding_iter,
&node_alias[i]);
}
/* Final payload contains the actual data. */
payloads[nhops-1] = tlv_obs2_onionmsg_payload_new(payloads);
/* We don't include enctlv in final, but it gives us final alias */
if (!create_obs2_final_enctlv(tmpctx, &blinding_iter, &sent->path[nhops-1],
/* FIXME: Pad? */ 0,
NULL,
&node_alias[nhops-1])) {
/* Should not happen! */
return command_fail(cmd, LIGHTNINGD,
"Could create final enctlv");
}
/* FIXME: This interface is a string for sendobsonionmessage! */
if (streq(sending->msgfield, "invoice_request")) {
payloads[nhops-1]->invoice_request
= cast_const(u8 *, sending->msgval);
} else {
assert(streq(sending->msgfield, "invoice"));
payloads[nhops-1]->invoice
= cast_const(u8 *, sending->msgval);
}
payloads[nhops-1]->reply_path = sending->obs2_reply_path;
req = jsonrpc_request_start(cmd->plugin, cmd, "sendobs2onionmessage",
sending->done,
forward_error,
sending->sent);
json_add_pubkey(req->js, "first_id", &sent->path[1]);
json_add_pubkey(req->js, "blinding", &fwd_blinding);
json_array_start(req->js, "hops");
for (size_t i = 1; i < nhops; i++) {
u8 *tlv;
json_object_start(req->js, NULL);
json_add_pubkey(req->js, "id", &node_alias[i]);
tlv = tal_arr(tmpctx, u8, 0);
towire_tlv_obs2_onionmsg_payload(&tlv, payloads[i]);
json_add_hex_talarr(req->js, "tlv", tlv);
json_object_end(req->js);
}
json_array_end(req->js);
return send_outreq(cmd->plugin, req);
}
static struct command_result *
send_modern_message(struct command *cmd,
struct tlv_onionmsg_payload_reply_path *reply_path,
struct sending *sending)
{
struct sent *sent = sending->sent;
struct privkey blinding_iter;
struct pubkey fwd_blinding, *node_alias;
size_t nhops = tal_count(sent->path);
struct tlv_onionmsg_payload **payloads;
struct out_req *req;
/* Now create enctlvs for *forward* path. */
randombytes_buf(&blinding_iter, sizeof(blinding_iter));
if (!pubkey_from_privkey(&blinding_iter, &fwd_blinding))
return command_fail(cmd, LIGHTNINGD,
"Could not convert blinding %s to pubkey!",
type_to_string(tmpctx, struct privkey,
&blinding_iter));
/* We overallocate: this node (0) doesn't have payload or alias */
payloads = tal_arr(cmd, struct tlv_onionmsg_payload *, nhops);
node_alias = tal_arr(cmd, struct pubkey, nhops);
for (size_t i = 1; i < nhops - 1; i++) {
payloads[i] = tlv_onionmsg_payload_new(payloads);
payloads[i]->encrypted_data_tlv = create_enctlv(payloads[i],
&blinding_iter,
&sent->path[i],
&sent->path[i+1],
/* FIXME: Pad? */
0,
NULL,
&blinding_iter,
&node_alias[i]);
}
/* Final payload contains the actual data. */
payloads[nhops-1] = tlv_onionmsg_payload_new(payloads);
/* We don't include enctlv in final, but it gives us final alias */
if (!create_final_enctlv(tmpctx, &blinding_iter, &sent->path[nhops-1],
/* FIXME: Pad? */ 0,
NULL,
&node_alias[nhops-1])) {
/* Should not happen! */
return command_fail(cmd, LIGHTNINGD,
"Could create final enctlv");
}
/* FIXME: This interface is a string for sendobsonionmessage! */
if (streq(sending->msgfield, "invoice_request")) {
payloads[nhops-1]->invoice_request
= cast_const(u8 *, sending->msgval);
} else {
assert(streq(sending->msgfield, "invoice"));
payloads[nhops-1]->invoice
= cast_const(u8 *, sending->msgval);
}
payloads[nhops-1]->reply_path = reply_path;
req = jsonrpc_request_start(cmd->plugin, cmd, "sendonionmessage",
/* Try sending older version next */
send_obs2_message,
forward_error,
sending);
json_add_pubkey(req->js, "first_id", &sent->path[1]);
json_add_pubkey(req->js, "blinding", &fwd_blinding);
json_array_start(req->js, "hops");
for (size_t i = 1; i < nhops; i++) {
u8 *tlv;
json_object_start(req->js, NULL);
json_add_pubkey(req->js, "id", &node_alias[i]);
tlv = tal_arr(tmpctx, u8, 0);
towire_tlv_onionmsg_payload(&tlv, payloads[i]);
json_add_hex_talarr(req->js, "tlv", tlv);
json_object_end(req->js);
}
json_array_end(req->js);
return send_outreq(cmd->plugin, req);
}
/* Lightningd gives us reply path, since we don't know secret to put
* in final so it will recognize it. */
static struct command_result *use_reply_path(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct sending *sending)
{
struct tlv_onionmsg_payload_reply_path *rpath;
rpath = json_to_reply_path(cmd, buf,
json_get_member(buf, result, "blindedpath"));
if (!rpath)
plugin_err(cmd->plugin,
"could not parse reply path %.*s?",
json_tok_full_len(result),
json_tok_full(buf, result));
sending->obs2_reply_path = json_to_obs2_reply_path(cmd, buf,
json_get_member(buf, result,
"obs2blindedpath"));
if (!sending->obs2_reply_path)
plugin_err(cmd->plugin,
"could not parse obs2 reply path %.*s?",
json_tok_full_len(result),
json_tok_full(buf, result));
/* Remember our alias we used so we can recognize reply */
sending->sent->reply_alias
= tal_dup(sending->sent, struct pubkey,
&rpath->path[tal_count(rpath->path)-1]->node_id);
return send_modern_message(cmd, rpath, sending);
}
static struct command_result *make_reply_path(struct command *cmd,
struct sending *sending)
{
struct out_req *req;
size_t nhops = tal_count(sending->sent->path);
/* FIXME: Maybe we should allow this? */
if (tal_count(sending->sent->path) == 1)
return command_fail(cmd, PAY_ROUTE_NOT_FOUND,
"Refusing to talk to ourselves");
req = jsonrpc_request_start(cmd->plugin, cmd, "blindedpath",
use_reply_path,
forward_error,
sending);
/* FIXME: Could create an independent reply path, not just
* reverse existing. */
json_array_start(req->js, "ids");
for (int i = nhops - 2; i >= 0; i--)
json_add_pubkey(req->js, NULL, &sending->sent->path[i]);
json_array_end(req->js);
return send_outreq(cmd->plugin, req);
}
static struct command_result *send_message(struct command *cmd,
struct sent *sent,
const char *msgfield TAKES,
const u8 *msgval TAKES,
struct command_result *(*done)
(struct command *cmd,
const char *buf UNUSED,
const jsmntok_t *result UNUSED,
struct sent *sent))
{
struct sending *sending = tal(cmd, struct sending);
sending->sent = sent;
sending->msgfield = tal_strdup(sending, msgfield);
sending->msgval = tal_dup_talarr(sending, u8, msgval);
sending->done = done;
return make_reply_path(cmd, sending);
}
/* We've received neither a reply nor a payment; return failure. */
static void timeout_sent_inv(struct sent *sent)
{
struct json_out *details = json_out_new(sent);
json_out_start(details, NULL, '{');
json_out_addstr(details, "invstring", invoice_encode(tmpctx, sent->inv));
json_out_end(details, '}');
/* This will free sent! */
discard_result(command_done_err(sent->cmd, OFFER_TIMEOUT,
"Failed: timeout waiting for response",
details));
}
static struct command_result *prepare_inv_timeout(struct command *cmd,
const char *buf UNUSED,
const jsmntok_t *result UNUSED,
struct sent *sent)
{
tal_steal(cmd, plugin_timer(cmd->plugin,
time_from_sec(sent->wait_timeout),
timeout_sent_inv, sent));
return sendonionmsg_done(cmd, buf, result, sent);
}
/* We've connected (if we tried), so send the invreq. */
static struct command_result *
sendinvreq_after_connect(struct command *cmd,
const char *buf UNUSED,
const jsmntok_t *result UNUSED,
struct sent *sent)
{
u8 *rawinvreq = tal_arr(tmpctx, u8, 0);
towire_tlv_invoice_request(&rawinvreq, sent->invreq);
return send_message(cmd, sent, "invoice_request", rawinvreq,
sendonionmsg_done);
}
struct connect_attempt {
struct node_id node_id;
struct command_result *(*cb)(struct command *command,
const char *buf,
const jsmntok_t *result,
struct sent *sent);
struct sent *sent;
};
static struct command_result *connected(struct command *command,
const char *buf,
const jsmntok_t *result,
struct connect_attempt *ca)
{
return ca->cb(command, buf, result, ca->sent);
}
static struct command_result *connect_failed(struct command *command,
const char *buf,
const jsmntok_t *result,
struct connect_attempt *ca)
{
return command_done_err(command, OFFER_ROUTE_NOT_FOUND,
"Failed: could not route, could not connect",
NULL);
}
/* Offers contain only a 32-byte id. If we can't find the address, we
* don't know if it's 02 or 03, so we try both. If we're here, we
* failed 02. */
static struct command_result *try_other_parity(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct connect_attempt *ca)
{
struct out_req *req;
/* Flip parity */
ca->node_id.k[0] = SECP256K1_TAG_PUBKEY_ODD;
/* Path is us -> them, so they're second entry */
if (!pubkey_from_node_id(&ca->sent->path[1], &ca->node_id)) {
/* Should not happen!
* Pieter Wuille points out:
* y^2 = x^3 + 7 mod p
* negating y doesn’t change the left hand side
*/
return command_done_err(cmd, LIGHTNINGD,
"Failed: could not convert inverted pubkey?",
NULL);
}
req = jsonrpc_request_start(cmd->plugin, cmd, "connect", connected,
connect_failed, ca);
json_add_node_id(req->js, "id", &ca->node_id);
return send_outreq(cmd->plugin, req);
}
/* We can't find a route, so we're going to try to connect, then just blast it
* to them. */
static struct command_result *
connect_direct(struct command *cmd,
const struct point32 *dst,
enum nodeid_parity parity,
struct command_result *(*cb)(struct command *command,
const char *buf,
const jsmntok_t *result,
struct sent *sent),
struct sent *sent)
{
struct out_req *req;
struct connect_attempt *ca = tal(cmd, struct connect_attempt);