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core-lightning/lightningd/pay.c
Rusty Russell 2aad3ffcf8 common: tal_dup_talarr() helper. 
This is a common thing to do, so create a macro.

Unfortunately, it still needs the type arg, because the paramter may
be const, and the return cannot be, and C doesn't have a general
"(-const)" cast.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2020-02-27 14:16:16 +10:30

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#include "pay.h"
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <common/bolt11.h>
#include <common/json_command.h>
#include <common/json_helpers.h>
#include <common/jsonrpc_errors.h>
#include <common/onion.h>
#include <common/onionreply.h>
#include <common/param.h>
#include <common/timeout.h>
#include <gossipd/gen_gossip_wire.h>
#include <lightningd/chaintopology.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/notification.h>
#include <lightningd/options.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_htlcs.h>
#include <lightningd/subd.h>
#include <sodium/randombytes.h>
/* Routing failure object */
struct routing_failure {
unsigned int erring_index;
enum onion_type failcode;
const struct node_id *erring_node;
const struct short_channel_id *erring_channel;
int channel_dir;
/* If remote sent us a message, this is it. */
const u8 *msg;
};
/* sendpay command */
struct sendpay_command {
struct list_node list;
struct sha256 payment_hash;
u64 partid;
struct command *cmd;
};
static void destroy_sendpay_command(struct sendpay_command *pc)
{
list_del(&pc->list);
}
/* Owned by cmd, if cmd is deleted, then sendpay_success/sendpay_fail will
* no longer be called. */
static void
add_sendpay_waiter(struct lightningd *ld,
struct command *cmd,
const struct sha256 *payment_hash,
u64 partid)
{
struct sendpay_command *pc = tal(cmd, struct sendpay_command);
pc->payment_hash = *payment_hash;
pc->partid = partid;
pc->cmd = cmd;
list_add(&ld->sendpay_commands, &pc->list);
tal_add_destructor(pc, destroy_sendpay_command);
}
/* Owned by cmd, if cmd is deleted, then sendpay_success/sendpay_fail will
* no longer be called. */
static void
add_waitsendpay_waiter(struct lightningd *ld,
struct command *cmd,
const struct sha256 *payment_hash,
u64 partid)
{
struct sendpay_command *pc = tal(cmd, struct sendpay_command);
pc->payment_hash = *payment_hash;
pc->partid = partid;
pc->cmd = cmd;
list_add(&ld->waitsendpay_commands, &pc->list);
tal_add_destructor(pc, destroy_sendpay_command);
}
/* Outputs fields, not a separate object*/
void json_add_payment_fields(struct json_stream *response,
const struct wallet_payment *t)
{
json_add_u64(response, "id", t->id);
json_add_sha256(response, "payment_hash", &t->payment_hash);
if (t->partid)
json_add_u64(response, "partid", t->partid);
if (t->destination != NULL)
json_add_node_id(response, "destination", t->destination);
/* If we have a 0 amount delivered at the remote end we simply don't
* know since the onion was generated externally. */
if (amount_msat_greater(t->msatoshi, AMOUNT_MSAT(0)))
json_add_amount_msat_compat(response, t->msatoshi, "msatoshi",
"amount_msat");
else
json_add_null(response, "amount_msat");
json_add_amount_msat_compat(response, t->msatoshi_sent,
"msatoshi_sent", "amount_sent_msat");
json_add_u64(response, "created_at", t->timestamp);
switch (t->status) {
case PAYMENT_PENDING:
json_add_string(response, "status", "pending");
break;
case PAYMENT_COMPLETE:
json_add_string(response, "status", "complete");
break;
case PAYMENT_FAILED:
json_add_string(response, "status", "failed");
break;
}
if (t->payment_preimage)
json_add_preimage(response, "payment_preimage",
t->payment_preimage);
if (t->label)
json_add_string(response, "label", t->label);
if (t->bolt11)
json_add_string(response, "bolt11", t->bolt11);
if (t->failonion)
json_add_hex(response, "erroronion", t->failonion,
tal_count(t->failonion));
}
static struct command_result *sendpay_success(struct command *cmd,
const struct wallet_payment *payment)
{
struct json_stream *response;
assert(payment->status == PAYMENT_COMPLETE);
response = json_stream_success(cmd);
json_add_payment_fields(response, payment);
return command_success(cmd, response);
}
static void
json_add_routefail_info(struct json_stream *js,
unsigned int erring_index,
enum onion_type failcode,
const struct node_id *erring_node,
const struct short_channel_id *erring_channel,
int channel_dir,
const u8 *msg)
{
const char *failcodename = onion_type_name(failcode);
json_add_num(js, "erring_index", erring_index);
json_add_num(js, "failcode", failcode);
/* FIXME: Better way to detect this? */
if (!strstarts(failcodename, "INVALID "))
json_add_string(js, "failcodename", failcodename);
if (erring_node != NULL)
json_add_node_id(js, "erring_node", erring_node);
if (erring_channel != NULL) {
json_add_short_channel_id(js, "erring_channel", erring_channel);
json_add_num(js, "erring_direction", channel_dir);
}
if (msg)
json_add_hex_talarr(js, "raw_message", msg);
}
void json_sendpay_fail_fields(struct json_stream *js,
const struct wallet_payment *payment,
errcode_t pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail)
{
/* "immediate_routing_failure" is before payment creation. */
if (payment)
json_add_payment_fields(js, payment);
if (pay_errcode == PAY_UNPARSEABLE_ONION && onionreply)
json_add_hex_talarr(js, "onionreply", onionreply->contents);
else
json_add_routefail_info(js,
fail->erring_index,
fail->failcode,
fail->erring_node,
fail->erring_channel,
fail->channel_dir,
fail->msg);
}
static const char *sendpay_errmsg_fmt(const tal_t *ctx, errcode_t pay_errcode,
const struct routing_failure *fail,
const char *details)
{
char *errmsg;
if (pay_errcode == PAY_UNPARSEABLE_ONION)
errmsg = "Malformed error reply";
else {
assert(fail);
errmsg = tal_fmt(ctx, "failed: %s (%s)",
onion_type_name(fail->failcode), details);
}
return errmsg;
}
/* onionreply used if pay_errcode == PAY_UNPARSEABLE_ONION */
static struct command_result *
sendpay_fail(struct command *cmd,
const struct wallet_payment *payment,
errcode_t pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail,
const char *errmsg)
{
struct json_stream *data;
data = json_stream_fail(cmd, pay_errcode,
errmsg);
json_sendpay_fail_fields(data,
payment,
pay_errcode,
onionreply,
fail);
json_object_end(data);
return command_failed(cmd, data);
}
/* We defer sendpay "success" until we know it's pending; consumes cmd */
static struct command_result *
json_sendpay_in_progress(struct command *cmd,
const struct wallet_payment *payment)
{
struct json_stream *response = json_stream_success(cmd);
json_add_string(response, "message",
"Monitor status with listpays or waitsendpay");
json_add_payment_fields(response, payment);
return command_success(cmd, response);
}
static void tell_waiters_failed(struct lightningd *ld,
const struct sha256 *payment_hash,
const struct wallet_payment *payment,
errcode_t pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail,
const char *details)
{
struct sendpay_command *pc;
struct sendpay_command *next;
const char *errmsg =
sendpay_errmsg_fmt(tmpctx, pay_errcode, fail, details);
/* Careful: sendpay_fail deletes cmd */
list_for_each_safe(&ld->waitsendpay_commands, pc, next, list) {
if (!sha256_eq(payment_hash, &pc->payment_hash))
continue;
if (payment->partid != pc->partid)
continue;
sendpay_fail(pc->cmd, payment, pay_errcode, onionreply, fail,
errmsg);
}
notify_sendpay_failure(ld,
payment,
pay_errcode,
onionreply,
fail,
errmsg);
}
static void tell_waiters_success(struct lightningd *ld,
const struct sha256 *payment_hash,
struct wallet_payment *payment)
{
struct sendpay_command *pc;
struct sendpay_command *next;
/* Careful: sendpay_success deletes cmd */
list_for_each_safe(&ld->waitsendpay_commands, pc, next, list) {
if (!sha256_eq(payment_hash, &pc->payment_hash))
continue;
if (payment->partid != pc->partid)
continue;
sendpay_success(pc->cmd, payment);
}
notify_sendpay_success(ld, payment);
}
void payment_succeeded(struct lightningd *ld, struct htlc_out *hout,
const struct preimage *rval)
{
struct wallet_payment *payment;
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
hout->partid,
PAYMENT_COMPLETE, rval);
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
&hout->payment_hash,
hout->partid);
assert(payment);
tell_waiters_success(ld, &hout->payment_hash, payment);
}
/* Return a struct routing_failure for an immediate failure
* (returned directly from send_htlc_out). The returned
* failure is allocated from the given context. */
static struct routing_failure*
immediate_routing_failure(const tal_t *ctx,
const struct lightningd *ld,
enum onion_type failcode,
const struct short_channel_id *channel0,
const struct node_id *dstid)
{
struct routing_failure *routing_failure;
assert(failcode);
routing_failure = tal(ctx, struct routing_failure);
routing_failure->erring_index = 0;
routing_failure->failcode = failcode;
routing_failure->erring_node =
tal_dup(routing_failure, struct node_id, &ld->id);
routing_failure->erring_channel =
tal_dup(routing_failure, struct short_channel_id, channel0);
routing_failure->channel_dir = node_id_idx(&ld->id, dstid);
routing_failure->msg = NULL;
return routing_failure;
}
/* Return a struct routing_failure for a local failure allocated
* from the given context. */
static struct routing_failure*
local_routing_failure(const tal_t *ctx,
const struct lightningd *ld,
const struct htlc_out *hout,
const struct wallet_payment *payment)
{
struct routing_failure *routing_failure;
routing_failure = tal(ctx, struct routing_failure);
routing_failure->erring_index = 0;
routing_failure->failcode = fromwire_peektype(hout->failmsg);
routing_failure->erring_node =
tal_dup(routing_failure, struct node_id, &ld->id);
if (payment->route_nodes != NULL && payment->route_channels != NULL) {
routing_failure->erring_channel =
tal_dup(routing_failure, struct short_channel_id,
&payment->route_channels[0]);
routing_failure->channel_dir =
node_id_idx(&ld->id, &payment->route_nodes[0]);
} else {
routing_failure->erring_channel = NULL;
}
routing_failure->msg = NULL;
log_debug(hout->key.channel->log, "local_routing_failure: %u (%s)",
routing_failure->failcode,
onion_type_name(routing_failure->failcode));
return routing_failure;
}
/* Fills in *pay_errcode with PAY_TRY_OTHER_ROUTE or PAY_DESTINATION_PERM_FAIL */
static struct routing_failure*
remote_routing_failure(const tal_t *ctx,
struct lightningd *ld,
const struct wallet_payment *payment,
const u8 *failuremsg,
int origin_index,
struct log *log,
errcode_t *pay_errcode)
{
enum onion_type failcode = fromwire_peektype(failuremsg);
struct routing_failure *routing_failure;
const struct node_id *route_nodes;
const struct node_id *erring_node;
const struct short_channel_id *route_channels;
const struct short_channel_id *erring_channel;
int dir;
routing_failure = tal(ctx, struct routing_failure);
route_nodes = payment->route_nodes;
route_channels = payment->route_channels;
assert(route_nodes == NULL || origin_index < tal_count(route_nodes));
/* Either we have both channels and nodes, or neither */
assert((route_nodes == NULL) == (route_channels == NULL));
if (route_nodes == NULL) {
/* This means we have the `shared_secrets`, but cannot infer
* the erring channel and node since we don't have them. This
* can happen if the payment was initialized using `sendonion`
* and the `shared_secrets` where specified. */
dir = 0;
erring_channel = NULL;
erring_node = NULL;
/* We don't know if there's another route, that'd depend on
* where the failure occured and whether it was a node
* failure. Let's assume it wasn't a terminal one, and have
* the sendonion caller deal with the actual decision. */
*pay_errcode = PAY_TRY_OTHER_ROUTE;
} else if (origin_index == tal_count(route_nodes) - 1) {
/* If any channel is to blame, it's the last one. */
erring_channel = &route_channels[origin_index];
/* Single hop? */
if (origin_index == 0)
dir = node_id_idx(&ld->id,
&route_nodes[origin_index]);
else
dir = node_id_idx(&route_nodes[origin_index - 1],
&route_nodes[origin_index]);
/* BOLT #4:
*
* - if the _final node_ is returning the error:
* - if the PERM bit is set:
* - SHOULD fail the payment.
* */
if (failcode & BADONION)
*pay_errcode = PAY_UNPARSEABLE_ONION;
else if (failcode & PERM)
*pay_errcode = PAY_DESTINATION_PERM_FAIL;
else
/* FIXME: not right for WIRE_FINAL_EXPIRY_TOO_SOON */
*pay_errcode = PAY_TRY_OTHER_ROUTE;
erring_node = &route_nodes[origin_index];
} else {
u8 *gossip_msg;
*pay_errcode = PAY_TRY_OTHER_ROUTE;
/* Report the *next* channel as failing. */
erring_channel = &route_channels[origin_index + 1];
dir = node_id_idx(&route_nodes[origin_index],
&route_nodes[origin_index+1]);
/* If the error is a BADONION, then it's on behalf of the
* following node. */
if (failcode & BADONION) {
log_debug(log, "failcode %u from onionreply %s",
failcode, tal_hex(tmpctx, failuremsg));
erring_node = &route_nodes[origin_index + 1];
} else
erring_node = &route_nodes[origin_index];
/* Tell gossipd: it may want to remove channels or even nodes
* in response to this, and there may be a channel_update
* embedded too */
gossip_msg = towire_gossip_payment_failure(NULL,
erring_node,
erring_channel,
dir,
failuremsg);
subd_send_msg(ld->gossip, take(gossip_msg));
}
routing_failure->erring_index = (unsigned int) (origin_index + 1);
routing_failure->failcode = failcode;
routing_failure->msg = tal_dup_talarr(routing_failure, u8, failuremsg);
if (erring_node != NULL)
routing_failure->erring_node =
tal_dup(routing_failure, struct node_id, erring_node);
else
routing_failure->erring_node = NULL;
if (erring_channel != NULL) {
routing_failure->erring_channel = tal_dup(
routing_failure, struct short_channel_id, erring_channel);
routing_failure->channel_dir = dir;
} else {
routing_failure->erring_channel = NULL;
routing_failure->channel_dir = 0;
}
return routing_failure;
}
void payment_store(struct lightningd *ld, struct wallet_payment *payment TAKES)
{
struct sendpay_command *pc;
struct sendpay_command *next;
/* Need to remember here otherwise wallet_payment_store will free us. */
bool ptaken = taken(payment);
wallet_payment_store(ld->wallet, payment);
/* Trigger any sendpay commands waiting for the store to occur. */
list_for_each_safe(&ld->sendpay_commands, pc, next, list) {
if (!sha256_eq(&payment->payment_hash, &pc->payment_hash))
continue;
/* Deletes from list, frees pc */
json_sendpay_in_progress(pc->cmd, payment);
}
if (ptaken)
tal_free(payment);
}
void payment_failed(struct lightningd *ld, const struct htlc_out *hout,
const char *localfail)
{
struct wallet_payment *payment;
struct routing_failure* fail = NULL;
const char *failstr;
errcode_t pay_errcode;
const u8 *failmsg;
int origin_index;
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
&hout->payment_hash,
hout->partid);
#ifdef COMPAT_V052
/* Prior to "pay: delete HTLC when we delete payment." we would
* delete a payment on retry, but leave the HTLC. */
if (!payment) {
log_unusual(hout->key.channel->log,
"No payment for %s:"
" was this an old database?",
type_to_string(tmpctx, struct sha256,
&hout->payment_hash));
return;
}
#else
assert(payment);
#endif
assert((payment->route_channels == NULL) == (payment->route_nodes == NULL));
/* This gives more details than a generic failure message */
if (localfail) {
fail = local_routing_failure(tmpctx, ld, hout, payment);
failstr = localfail;
pay_errcode = PAY_TRY_OTHER_ROUTE;
} else if (payment->path_secrets == NULL) {
/* This was a payment initiated with `sendonion`, we therefore
* don't have the path secrets and cannot decode the error
* onion. Let's store it and hope whatever called `sendonion`
* knows how to deal with these. */
pay_errcode = PAY_UNPARSEABLE_ONION;
fail = NULL;
failstr = NULL;
} else if (hout->failmsg) {
/* This can happen when a direct peer told channeld it's a
* malformed onion using update_fail_malformed_htlc. */
failstr = "local failure";
failmsg = hout->failmsg;
origin_index = 0;
pay_errcode = PAY_TRY_OTHER_ROUTE;
goto use_failmsg;
} else {
/* Must be normal remote fail with an onion-wrapped error. */
failstr = "reply from remote";
/* Try to parse reply. */
struct secret *path_secrets = payment->path_secrets;
failmsg = unwrap_onionreply(tmpctx, path_secrets,
tal_count(path_secrets),
hout->failonion, &origin_index);
if (!failmsg) {
log_info(hout->key.channel->log,
"htlc %"PRIu64" failed with bad reply (%s)",
hout->key.id,
tal_hex(tmpctx, hout->failonion->contents));
/* Cannot record failure. */
fail = NULL;
pay_errcode = PAY_UNPARSEABLE_ONION;
} else {
enum onion_type failcode;
use_failmsg:
failcode = fromwire_peektype(failmsg);
log_info(hout->key.channel->log,
"htlc %"PRIu64" "
"failed from %ith node "
"with code 0x%04x (%s)",
hout->key.id,
origin_index,
failcode, onion_type_name(failcode));
fail = remote_routing_failure(tmpctx, ld,
payment, failmsg,
origin_index,
hout->key.channel->log,
&pay_errcode);
}
}
/* Save to DB */
payment_store(ld, payment);
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
hout->partid,
PAYMENT_FAILED, NULL);
wallet_payment_set_failinfo(ld->wallet,
&hout->payment_hash,
hout->partid,
fail ? NULL : hout->failonion,
pay_errcode == PAY_DESTINATION_PERM_FAIL,
fail ? fail->erring_index : -1,
fail ? fail->failcode : 0,
fail ? fail->erring_node : NULL,
fail ? fail->erring_channel : NULL,
NULL,
failstr,
fail ? fail->channel_dir : 0);
tell_waiters_failed(ld, &hout->payment_hash, payment, pay_errcode,
hout->failonion, fail, failstr);
}
/* Wait for a payment. If cmd is deleted, then wait_payment()
* no longer be called.
* Return callback if we called already, otherwise NULL. */
static struct command_result *wait_payment(struct lightningd *ld,
struct command *cmd,
const struct sha256 *payment_hash,
u64 partid)
{
struct wallet_payment *payment;
struct onionreply *failonionreply;
bool faildestperm;
int failindex;
enum onion_type failcode;
struct node_id *failnode;
struct short_channel_id *failchannel;
u8 *failupdate;
char *faildetail;
struct routing_failure *fail;
int faildirection;
errcode_t rpcerrorcode;
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
payment_hash, partid);
if (!payment) {
return command_fail(cmd, PAY_NO_SUCH_PAYMENT,
"Never attempted payment part %"PRIu64
" for '%s'",
partid,
type_to_string(tmpctx, struct sha256,
payment_hash));
}
log_debug(cmd->ld->log, "Payment part %"PRIu64"/%"PRIu64" status %u",
partid, payment->partid, payment->status);
switch (payment->status) {
case PAYMENT_PENDING:
add_waitsendpay_waiter(ld, cmd, payment_hash, partid);
return NULL;
case PAYMENT_COMPLETE:
return sendpay_success(cmd, payment);
case PAYMENT_FAILED:
/* Get error from DB */
wallet_payment_get_failinfo(tmpctx, ld->wallet,
payment_hash,
partid,
&failonionreply,
&faildestperm,
&failindex,
&failcode,
&failnode,
&failchannel,
&failupdate,
&faildetail,
&faildirection);
/* Old DB might not save failure information */
if (!failonionreply && !failnode) {
return command_fail(cmd, PAY_UNSPECIFIED_ERROR,
"Payment failure reason unknown");
} else if (failonionreply) {
/* failed to parse returned onion error */
return sendpay_fail(
cmd, payment, PAY_UNPARSEABLE_ONION, failonionreply,
NULL,
sendpay_errmsg_fmt(tmpctx, PAY_UNPARSEABLE_ONION,
NULL, faildetail));
} else {
/* Parsed onion error, get its details */
assert(failnode);
assert(failchannel);
fail = tal(tmpctx, struct routing_failure);
fail->erring_index = failindex;
fail->failcode = failcode;
fail->erring_node =
tal_dup(fail, struct node_id, failnode);
fail->erring_channel =
tal_dup(fail, struct short_channel_id, failchannel);
fail->channel_dir = faildirection;
/* FIXME: We don't store this! */
fail->msg = NULL;
rpcerrorcode = faildestperm ? PAY_DESTINATION_PERM_FAIL
: PAY_TRY_OTHER_ROUTE;
return sendpay_fail(
cmd, payment, rpcerrorcode, NULL, fail,
sendpay_errmsg_fmt(tmpctx, rpcerrorcode, fail,
faildetail));
}
}
/* Impossible. */
abort();
}
static bool should_use_tlv(enum route_hop_style style)
{
switch (style) {
case ROUTE_HOP_TLV:
return true;
/* Otherwise fall thru */
case ROUTE_HOP_LEGACY:
return false;
}
abort();
}
/* Returns failmsg on failure, tallocated off ctx */
static const u8 *send_onion(const tal_t *ctx, struct lightningd *ld,
const struct onionpacket *packet,
const struct route_hop *first_hop,
const struct sha256 *payment_hash,
u64 partid,
struct channel *channel,
struct htlc_out **hout)
{
const u8 *onion;
unsigned int base_expiry;
base_expiry = get_block_height(ld->topology) + 1;
onion = serialize_onionpacket(tmpctx, packet);
return send_htlc_out(ctx, channel, first_hop->amount,
base_expiry + first_hop->delay,
payment_hash, partid, onion, NULL, hout);
}
/* destination/route_channels/route_nodes are NULL (and path_secrets may be NULL)
* if we're sending a raw onion. */
static struct command_result *
send_payment_core(struct lightningd *ld,
struct command *cmd,
const struct sha256 *rhash,
u64 partid,
const struct route_hop *first_hop,
struct amount_msat msat,
struct amount_msat total_msat,
const char *label TAKES,
const char *b11str TAKES,
const struct onionpacket *packet,
const struct node_id *destination,
struct node_id *route_nodes TAKES,
struct short_channel_id *route_channels TAKES,
struct secret *path_secrets)
{
const struct wallet_payment **payments, *old_payment = NULL;
struct channel *channel;
const u8 *failmsg;
struct htlc_out *hout;
struct routing_failure *fail;
struct amount_msat msat_already_pending = AMOUNT_MSAT(0);
/* Now, do we already have one or more payments? */
payments = wallet_payment_list(tmpctx, ld->wallet, rhash);
for (size_t i = 0; i < tal_count(payments); i++) {
log_debug(ld->log, "Payment %zu/%zu: %s %s",
i, tal_count(payments),
type_to_string(tmpctx, struct amount_msat,
&payments[i]->msatoshi),
payments[i]->status == PAYMENT_COMPLETE ? "COMPLETE"
: payments[i]->status == PAYMENT_PENDING ? "PENDING"
: "FAILED");
switch (payments[i]->status) {
case PAYMENT_COMPLETE:
if (payments[i]->partid != partid)
continue;
/* Must match successful payment parameters. */
if (!amount_msat_eq(payments[i]->msatoshi, msat)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already succeeded "
"with amount %s",
type_to_string(tmpctx,
struct amount_msat,
&payments[i]->msatoshi));
}
if (payments[i]->destination && destination
&& !node_id_eq(payments[i]->destination,
destination)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already succeeded to %s",
type_to_string(tmpctx,
struct node_id,
payments[i]->destination));
}
return sendpay_success(cmd, payments[i]);
case PAYMENT_PENDING:
/* Can't mix non-parallel and parallel payments! */
if (!payments[i]->partid != !partid) {
return command_fail(cmd, PAY_IN_PROGRESS,
"Already have %s payment in progress",
payments[i]->partid ? "parallel" : "non-parallel");
}
if (payments[i]->partid == partid)
return json_sendpay_in_progress(cmd, payments[i]);
/* You shouldn't change your mind about amount being
* sent, since we'll use it in onion! */
else if (!amount_msat_eq(payments[i]->total_msat,
total_msat))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"msatoshi was previously %s, now %s",
type_to_string(tmpctx,
struct amount_msat,
&payments[i]->total_msat),
type_to_string(tmpctx,
struct amount_msat,
&total_msat));
if (!amount_msat_add(&msat_already_pending,
msat_already_pending,
payments[i]->msatoshi)) {
return command_fail(cmd, LIGHTNINGD,
"Internal amount overflow!"
" %s + %s in %zu/%zu",
type_to_string(tmpctx,
struct amount_msat,
&msat_already_pending),
type_to_string(tmpctx,
struct amount_msat,
&payments[i]->msatoshi),
i, tal_count(payments));
}
break;
case PAYMENT_FAILED:
if (payments[i]->partid == partid)
old_payment = payments[i];
}
}
/* BOLT #4:
*
* - MUST NOT send another HTLC if the total `amount_msat` of the HTLC
* set is already greater or equal to `total_msat`.
*/
/* We don't do this for single 0-value payments (sendonion does this) */
if (!amount_msat_eq(total_msat, AMOUNT_MSAT(0))
&& amount_msat_greater_eq(msat_already_pending, total_msat)) {
return command_fail(cmd, PAY_IN_PROGRESS,
"Already have %s of %s payments in progress",
type_to_string(tmpctx, struct amount_msat,
&msat_already_pending),
type_to_string(tmpctx, struct amount_msat,
&total_msat));
}
channel = active_channel_by_id(ld, &first_hop->nodeid, NULL);
if (!channel) {
struct json_stream *data
= json_stream_fail(cmd, PAY_TRY_OTHER_ROUTE,
"No connection to first "
"peer found");
json_add_routefail_info(data, 0, WIRE_UNKNOWN_NEXT_PEER,
&ld->id, &first_hop->channel_id,
node_id_idx(&ld->id, &first_hop->nodeid),
NULL);
json_object_end(data);
return command_failed(cmd, data);
}
failmsg = send_onion(tmpctx, ld, packet, first_hop, rhash, partid,
channel, &hout);
if (failmsg) {
fail = immediate_routing_failure(cmd, ld,
fromwire_peektype(failmsg),
&first_hop->channel_id,
&channel->peer->id);
return sendpay_fail(
cmd, old_payment, PAY_TRY_OTHER_ROUTE, NULL, fail,
sendpay_errmsg_fmt(tmpctx, PAY_TRY_OTHER_ROUTE, fail,
"First peer not ready"));
}
/* If we're retrying, delete all trace of previous one. We delete
* outgoing HTLC, too, otherwise it gets reported to onchaind as
* a possibility, and we end up in handle_missing_htlc_output->
* onchain_failed_our_htlc->payment_failed with no payment.
*/
if (old_payment) {
wallet_payment_delete(ld->wallet, rhash, partid);
wallet_local_htlc_out_delete(ld->wallet, channel, rhash,
partid);
}
/* If hout fails, payment should be freed too. */
struct wallet_payment *payment = tal(hout, struct wallet_payment);
payment->id = 0;
payment->payment_hash = *rhash;
payment->partid = partid;
if (destination)
payment->destination = tal_dup(payment, struct node_id, destination);
else
payment->destination = NULL;
payment->status = PAYMENT_PENDING;
payment->msatoshi = msat;
payment->msatoshi_sent = first_hop->amount;
payment->total_msat = total_msat;
payment->timestamp = time_now().ts.tv_sec;
payment->payment_preimage = NULL;
payment->path_secrets = tal_steal(payment, path_secrets);
if (route_nodes)
payment->route_nodes = tal_steal(payment, route_nodes);
else
payment->route_nodes = NULL;
if (route_channels)
payment->route_channels = tal_steal(payment, route_channels);
else
payment->route_channels = NULL;
payment->failonion = NULL;
if (label != NULL)
payment->label = tal_strdup(payment, label);
else
payment->label = NULL;
if (b11str != NULL)
payment->bolt11 = tal_strdup(payment, b11str);
else
payment->bolt11 = NULL;
/* We write this into db when HTLC is actually sent. */
wallet_payment_setup(ld->wallet, payment);
add_sendpay_waiter(ld, cmd, rhash, partid);
return command_still_pending(cmd);
}
static struct command_result *
send_payment(struct lightningd *ld,
struct command *cmd,
const struct sha256 *rhash,
u64 partid,
const struct route_hop *route,
struct amount_msat msat,
struct amount_msat total_msat,
const char *label TAKES,
const char *b11str TAKES,
const struct secret *payment_secret)
{
unsigned int base_expiry;
struct onionpacket *packet;
struct secret *path_secrets;
size_t i, n_hops = tal_count(route);
struct node_id *ids = tal_arr(tmpctx, struct node_id, n_hops);
struct short_channel_id *channels;
struct sphinx_path *path;
struct pubkey pubkey;
bool final_tlv, ret;
u8 *onion;
/* Expiry for HTLCs is absolute. And add one to give some margin. */
base_expiry = get_block_height(ld->topology) + 1;
path = sphinx_path_new(tmpctx, rhash->u.u8);
/* Extract IDs for each hop: create_onionpacket wants array. */
for (i = 0; i < n_hops; i++)
ids[i] = route[i].nodeid;
/* Create sphinx path */
for (i = 0; i < n_hops - 1; i++) {
ret = pubkey_from_node_id(&pubkey, &ids[i]);
assert(ret);
sphinx_add_hop(path, &pubkey,
take(onion_nonfinal_hop(NULL,
should_use_tlv(route[i].style),
&route[i + 1].channel_id,
route[i + 1].amount,
base_expiry + route[i + 1].delay)));
}
/* And finally set the final hop to the special values in
* BOLT04 */
ret = pubkey_from_node_id(&pubkey, &ids[i]);
assert(ret);
final_tlv = should_use_tlv(route[i].style);
/* BOLT #4:
* - Unless `node_announcement`, `init` message or the
* [BOLT #11](11-payment-encoding.md#tagged-fields) offers feature
* `var_onion_optin`:
* - MUST use the legacy payload format instead.
*/
/* In our case, we don't use it unless we also have a payment_secret;
* everyone should support this eventually */
if (!final_tlv && payment_secret)
final_tlv = true;
/* Parallel payments are invalid for legacy. */
if (partid && !final_tlv)
return command_fail(cmd, PAY_DESTINATION_PERM_FAIL,
"Cannot do parallel payments to legacy node");
onion = onion_final_hop(cmd,
final_tlv,
route[i].amount,
base_expiry + route[i].delay,
total_msat, payment_secret);
if (!onion) {
return command_fail(cmd, PAY_DESTINATION_PERM_FAIL,
"Destination does not support"
" payment_secret");
}
sphinx_add_hop(path, &pubkey, onion);
/* Copy channels used along the route. */
channels = tal_arr(tmpctx, struct short_channel_id, n_hops);
for (i = 0; i < n_hops; ++i)
channels[i] = route[i].channel_id;
log_info(ld->log, "Sending %s over %zu hops to deliver %s",
type_to_string(tmpctx, struct amount_msat, &route[0].amount),
n_hops, type_to_string(tmpctx, struct amount_msat, &msat));
packet = create_onionpacket(tmpctx, path, &path_secrets);
return send_payment_core(ld, cmd, rhash, partid, &route[0],
msat, total_msat, label, b11str,
packet, &ids[n_hops - 1], ids,
channels, path_secrets);
}
static struct command_result *
param_route_hop(struct command *cmd, const char *name, const char *buffer,
const jsmntok_t *tok, struct route_hop **hop)
{
const jsmntok_t *idtok, *channeltok, *directiontok, *amounttok, *delaytok;
struct route_hop *res;
res = tal(cmd, struct route_hop);
idtok = json_get_member(buffer, tok, "id");
channeltok = json_get_member(buffer, tok, "channel");
directiontok = json_get_member(buffer, tok, "direction");
amounttok = json_get_member(buffer, tok, "amount_msat");
delaytok = json_get_member(buffer, tok, "delay");
/* General verification that all fields that we need are present. */
if (!idtok && !channeltok)
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Either 'id' or 'channel' is required for a route_hop");
if (channeltok && !directiontok)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"When specifying a channel you must also "
"specify the direction");
if (!amounttok)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'amount_msat' is required");
if (!delaytok)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'delay' is required");
/* Parsing of actual values including sanity check for all parsed
* values. */
if (!idtok) {
memset(&res->nodeid, 0, sizeof(struct node_id));
} else if (!json_to_node_id(buffer, idtok, &res->nodeid)) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a node_id, not '%.*s'",
name, tok->end - tok->start,
buffer + tok->start);
}
if (!channeltok) {
memset(&res->channel_id, 0, sizeof(struct node_id));
} else if (!json_to_short_channel_id(buffer, channeltok, &res->channel_id)) {
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a short_channel_id, not '%.*s'", name,
tok->end - tok->start, buffer + tok->start);
}
if (directiontok && (!json_to_int(buffer, directiontok, &res->direction) ||
res->direction > 1 || res->direction < 0))
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be an integer in [0,1], not '%.*s'", name,
tok->end - tok->start, buffer + tok->start);
if (!json_to_msat(buffer, amounttok, &res->amount))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a valid amount_msat, not '%.*s'",
name, tok->end - tok->start,
buffer + tok->start);
if (!json_to_number(buffer, delaytok, &res->delay) || res->delay < 1)
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a positive, non-zero, number, not '%.*s'",
name, tok->end - tok->start, buffer + tok->start);
*hop = res;
return NULL;
}
static struct command_result *json_sendonion(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
u8 *onion;
struct onionpacket packet;
enum onion_type failcode;
struct route_hop *first_hop;
struct sha256 *payment_hash;
struct lightningd *ld = cmd->ld;
const char *label;
struct secret *path_secrets;
u64 *partid;
if (!param(cmd, buffer, params,
p_req("onion", param_bin_from_hex, &onion),
p_req("first_hop", param_route_hop, &first_hop),
p_req("payment_hash", param_sha256, &payment_hash),
p_opt("label", param_escaped_string, &label),
p_opt("shared_secrets", param_secrets_array, &path_secrets),
p_opt_def("partid", param_u64, &partid, 0),
NULL))
return command_param_failed();
failcode = parse_onionpacket(onion, tal_bytelen(onion), &packet);
if (failcode != 0)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Could not parse the onion. Parsing failed "
"with failcode=%d",
failcode);
return send_payment_core(ld, cmd, payment_hash, *partid,
first_hop, AMOUNT_MSAT(0), AMOUNT_MSAT(0),
label, NULL, &packet, NULL, NULL, NULL,
path_secrets);
}
static const struct json_command sendonion_command = {
"sendonion",
"payment",
json_sendonion,
"Send a payment with a pre-computed onion."
};
AUTODATA(json_command, &sendonion_command);
/*-----------------------------------------------------------------------------
JSON-RPC sendpay interface
-----------------------------------------------------------------------------*/
static struct command_result *param_route_hop_style(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
enum route_hop_style **style)
{
*style = tal(cmd, enum route_hop_style);
if (json_tok_streq(buffer, tok, "legacy")) {
**style = ROUTE_HOP_LEGACY;
return NULL;
} else if (json_tok_streq(buffer, tok, "tlv")) {
**style = ROUTE_HOP_TLV;
return NULL;
}
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a legacy or tlv, not '%.*s'",
name, json_tok_full_len(tok),
json_tok_full(buffer, tok));
}
static struct command_result *json_sendpay(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const jsmntok_t *routetok;
const jsmntok_t *t;
size_t i;
struct sha256 *rhash;
struct route_hop *route;
struct amount_msat *msat;
const char *b11str, *label = NULL;
u64 *partid;
struct secret *payment_secret;
/* For generating help, give new-style. */
if (!params || !deprecated_apis) {
if (!param(cmd, buffer, params,
p_req("route", param_array, &routetok),
p_req("payment_hash", param_sha256, &rhash),
p_opt("label", param_escaped_string, &label),
p_opt("msatoshi", param_msat, &msat),
p_opt("bolt11", param_string, &b11str),
p_opt("payment_secret", param_secret,
&payment_secret),
p_opt_def("partid", param_u64, &partid, 0),
NULL))
return command_param_failed();
} else if (params->type == JSMN_ARRAY) {
if (!param(cmd, buffer, params,
p_req("route", param_array, &routetok),
p_req("payment_hash", param_sha256, &rhash),
p_opt("label_or_description", param_escaped_string, &label),
p_opt("msatoshi", param_msat, &msat),
p_opt("bolt11", param_string, &b11str),
p_opt("payment_secret", param_secret,
&payment_secret),
p_opt_def("partid", param_u64, &partid, 0),
NULL))
return command_param_failed();
} else {
const char *desc = NULL;
if (!param(cmd, buffer, params,
p_req("route", param_array, &routetok),
p_req("payment_hash", param_sha256, &rhash),
p_opt("label", param_escaped_string, &label),
p_opt("description", param_escaped_string, &desc),
p_opt("msatoshi", param_msat, &msat),
p_opt("bolt11", param_string, &b11str),
p_opt("payment_secret", param_secret,
&payment_secret),
p_opt_def("partid", param_u64, &partid, 0),
NULL))
return command_param_failed();
if (!label && desc)
label = desc;
}
if (routetok->size == 0)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Empty route");
route = tal_arr(cmd, struct route_hop, routetok->size);
json_for_each_arr(i, t, routetok) {
struct amount_msat *msat, *amount_msat;
struct node_id *id;
struct short_channel_id *channel;
unsigned *delay, *direction;
enum route_hop_style *style;
if (!param(cmd, buffer, t,
/* Only *one* of these is required */
p_opt("msatoshi", param_msat, &msat),
p_opt("amount_msat", param_msat, &amount_msat),
/* These three actually required */
p_opt("id", param_node_id, &id),
p_opt("delay", param_number, &delay),
p_opt("channel", param_short_channel_id, &channel),
p_opt("direction", param_number, &direction),
p_opt_def("style", param_route_hop_style, &style,
ROUTE_HOP_LEGACY),
NULL))
return command_param_failed();
if (!msat && !amount_msat)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"route[%zi]: must have msatoshi"
" or amount_msat", i);
if (!id || !channel || !delay)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"route[%zi]: must have id, channel"
" and delay", i);
if (msat && amount_msat && !amount_msat_eq(*msat, *amount_msat))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"route[%zi]: msatoshi %s != amount_msat %s",
i,
type_to_string(tmpctx,
struct amount_msat,
msat),
type_to_string(tmpctx,
struct amount_msat,
amount_msat));
if (!msat)
msat = amount_msat;
route[i].amount = *msat;
route[i].nodeid = *id;
route[i].delay = *delay;
route[i].channel_id = *channel;
route[i].style = *style;
/* FIXME: Actually ignored by sending code! */
route[i].direction = direction ? *direction : 0;
}
if (*partid && !msat)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Must specify msatoshi with partid");
const struct amount_msat final_amount = route[routetok->size-1].amount;
if (msat && !*partid && !amount_msat_eq(*msat, final_amount))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Do not specify msatoshi (%s) without"
" partid: if you do, it must be exactly"
" the final amount (%s)",
type_to_string(tmpctx, struct amount_msat,
msat),
type_to_string(tmpctx, struct amount_msat,
&final_amount));
/* For MPP, the total we send must *exactly* equal the amount
* we promise to send (msatoshi). So no single payment can be
* > than that. */
if (*partid) {
if (amount_msat_greater(final_amount, *msat))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Final amount %s is greater than"
" %s, despite MPP",
type_to_string(tmpctx,
struct amount_msat,
&final_amount),
type_to_string(tmpctx,
struct amount_msat,
msat));
}
if (*partid && !payment_secret)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"partid requires payment_secret");
return send_payment(cmd->ld, cmd, rhash, *partid,
route,
final_amount,
msat ? *msat : final_amount,
label, b11str, payment_secret);
}
static const struct json_command sendpay_command = {
"sendpay",
"payment",
json_sendpay,
"Send along {route} in return for preimage of {payment_hash}"
};
AUTODATA(json_command, &sendpay_command);
static void waitsendpay_timeout(struct command *cmd)
{
was_pending(command_fail(cmd, PAY_IN_PROGRESS,
"Timed out while waiting"));
}
static struct command_result *json_waitsendpay(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct sha256 *rhash;
unsigned int *timeout;
struct command_result *res;
u64 *partid;
if (!param(cmd, buffer, params,
p_req("payment_hash", param_sha256, &rhash),
p_opt("timeout", param_number, &timeout),
p_opt_def("partid", param_u64, &partid, 0),
NULL))
return command_param_failed();
res = wait_payment(cmd->ld, cmd, rhash, *partid);
if (res)
return res;
if (timeout)
new_reltimer(cmd->ld->timers, cmd, time_from_sec(*timeout),
&waitsendpay_timeout, cmd);
return command_still_pending(cmd);
}
static const struct json_command waitsendpay_command = {
"waitsendpay",
"payment",
json_waitsendpay,
"Wait for payment attempt on {payment_hash} to succeed or fail, "
"but only up to {timeout} seconds."
};
AUTODATA(json_command, &waitsendpay_command);
static struct command_result *json_listsendpays(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const struct wallet_payment **payments;
struct json_stream *response;
struct sha256 *rhash;
const char *b11str;
if (!param(cmd, buffer, params,
p_opt("bolt11", param_string, &b11str),
p_opt("payment_hash", param_sha256, &rhash),
NULL))
return command_param_failed();
if (rhash && b11str) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Can only specify one of"
" {bolt11} or {payment_hash}");
}
if (b11str) {
struct bolt11 *b11;
char *fail;
b11 = bolt11_decode(cmd, b11str, NULL, &fail);
if (!b11) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Invalid bolt11: %s", fail);
}
rhash = &b11->payment_hash;
}
payments = wallet_payment_list(cmd, cmd->ld->wallet, rhash);
response = json_stream_success(cmd);
json_array_start(response, "payments");
for (size_t i = 0; i < tal_count(payments); i++) {
json_object_start(response, NULL);
json_add_payment_fields(response, payments[i]);
json_object_end(response);
}
json_array_end(response);
return command_success(cmd, response);
}
static const struct json_command listsendpays_command = {
"listsendpays",
"payment",
json_listsendpays,
"Show sendpay, old and current, optionally limiting to {bolt11} or {payment_hash}."
};
AUTODATA(json_command, &listsendpays_command);
static struct command_result *json_createonion(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct json_stream *response;
struct secret *session_key, *shared_secrets;
struct sphinx_path *sp;
u8 *assocdata, *serialized;
struct onionpacket *packet;
struct sphinx_hop *hops;
if (!param(cmd, buffer, params,
p_req("hops", param_hops_array, &hops),
p_req("assocdata", param_bin_from_hex, &assocdata),
p_opt("session_key", param_secret, &session_key),
NULL)) {
return command_param_failed();
}
if (session_key == NULL)
sp = sphinx_path_new(cmd, assocdata);
else
sp = sphinx_path_new_with_key(cmd, assocdata, session_key);
for (size_t i=0; i<tal_count(hops); i++)
sphinx_add_hop(sp, &hops[i].pubkey, hops[i].raw_payload);
if (sphinx_path_payloads_size(sp) > ROUTING_INFO_SIZE)
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Payloads exceed maximum onion packet size.");
packet = create_onionpacket(cmd, sp, &shared_secrets);
if (!packet)
return command_fail(cmd, LIGHTNINGD,
"Could not create onion packet");
serialized = serialize_onionpacket(cmd, packet);
response = json_stream_success(cmd);
json_add_hex(response, "onion", serialized, tal_bytelen(serialized));
json_array_start(response, "shared_secrets");
for (size_t i=0; i<tal_count(hops); i++) {
json_add_secret(response, NULL, &shared_secrets[i]);
}
json_array_end(response);
return command_success(cmd, response);
}
static const struct json_command createonion_command = {
"createonion",
"payment",
json_createonion,
"Create an onion going through the provided nodes, each with its own payload"
};
AUTODATA(json_command, &createonion_command);
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