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lightning/lightningd/invoice.c

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#include "invoice.h"
#include "json.h"
#include "jsonrpc.h"
#include "lightningd.h"
#include <bitcoin/address.h>
#include <bitcoin/base58.h>
#include <bitcoin/script.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <common/bech32.h>
#include <common/bolt11.h>
#include <common/json_command.h>
#include <common/json_escaped.h>
#include <common/jsonrpc_errors.h>
#include <common/param.h>
#include <common/pseudorand.h>
#include <common/utils.h>
#include <errno.h>
#include <gossipd/gen_gossip_wire.h>
#include <hsmd/gen_hsm_wire.h>
#include <inttypes.h>
#include <lightningd/channel.h>
#include <lightningd/hsm_control.h>
#include <lightningd/log.h>
#include <lightningd/options.h>
#include <lightningd/peer_control.h>
#include <lightningd/subd.h>
#include <sodium/randombytes.h>
#include <wire/wire_sync.h>
static const char *invoice_status_str(const struct invoice_details *inv)
{
if (inv->state == PAID)
return "paid";
if (inv->state == EXPIRED)
return "expired";
return "unpaid";
}
static void json_add_invoice(struct json_stream *response,
const struct invoice_details *inv)
{
json_object_start(response, NULL);
json_add_escaped_string(response, "label", inv->label);
json_add_string(response, "bolt11", inv->bolt11);
json_add_hex(response, "payment_hash", &inv->rhash, sizeof(inv->rhash));
if (inv->msatoshi)
json_add_u64(response, "msatoshi", *inv->msatoshi);
json_add_string(response, "status", invoice_status_str(inv));
if (inv->state == PAID) {
json_add_u64(response, "pay_index", inv->pay_index);
json_add_u64(response, "msatoshi_received",
inv->msatoshi_received);
json_add_u64(response, "paid_at", inv->paid_timestamp);
}
if (inv->description)
json_add_string(response, "description", inv->description);
json_add_u64(response, "expires_at", inv->expiry_time);
json_object_end(response);
}
static struct command_result *tell_waiter(struct command *cmd,
const struct invoice *inv)
{
struct json_stream *response;
const struct invoice_details *details;
details = wallet_invoice_details(cmd, cmd->ld->wallet, *inv);
if (details->state == PAID) {
response = json_stream_success(cmd);
json_add_invoice(response, details);
return command_success(cmd, response);
} else {
/* FIXME: -2 should be a constant in jsonrpc_errors.h. */
response = json_stream_fail(cmd, -2,
"invoice expired during wait");
json_add_invoice(response, details);
return command_failed(cmd, response);
}
}
static void tell_waiter_deleted(struct command *cmd)
{
was_pending(command_fail(cmd, LIGHTNINGD,
"Invoice deleted during wait"));
}
static void wait_on_invoice(const struct invoice *invoice, void *cmd)
{
if (invoice)
tell_waiter((struct command *) cmd, invoice);
else
tell_waiter_deleted((struct command *) cmd);
}
static bool hsm_sign_b11(const u5 *u5bytes,
const u8 *hrpu8,
secp256k1_ecdsa_recoverable_signature *rsig,
struct lightningd *ld)
{
u8 *msg = towire_hsm_sign_invoice(NULL, u5bytes, hrpu8);
if (!wire_sync_write(ld->hsm_fd, take(msg)))
fatal("Could not write to HSM: %s", strerror(errno));
msg = wire_sync_read(tmpctx, ld->hsm_fd);
if (!fromwire_hsm_sign_invoice_reply(msg, rsig))
fatal("HSM gave bad sign_invoice_reply %s",
tal_hex(msg, msg));
return true;
}
static struct command_result *parse_fallback(struct command *cmd,
const char *buffer,
const jsmntok_t *fallback,
const u8 **fallback_script)
{
enum address_parse_result fallback_parse;
fallback_parse
= json_tok_address_scriptpubkey(cmd,
get_chainparams(cmd->ld),
buffer, fallback,
fallback_script);
if (fallback_parse == ADDRESS_PARSE_UNRECOGNIZED) {
return command_fail(cmd, LIGHTNINGD,
"Fallback address not valid");
} else if (fallback_parse == ADDRESS_PARSE_WRONG_NETWORK) {
return command_fail(cmd, LIGHTNINGD,
"Fallback address does not match our network %s",
get_chainparams(cmd->ld)->network_name);
}
return NULL;
}
/* BOLT11 struct wants an array of arrays (can provide multiple routes) */
static struct route_info **select_inchan(const tal_t *ctx,
struct lightningd *ld,
u64 capacity_needed,
const struct route_info *inchans,
bool *any_offline)
{
const struct route_info *r = NULL;
struct route_info **ret;
*any_offline = false;
/* Weighted reservoir sampling.
* Based on https://en.wikipedia.org/wiki/Reservoir_sampling
* Algorithm A-Chao
*/
u64 wsum = 0;
for (size_t i = 0; i < tal_count(inchans); i++) {
struct peer *peer;
struct channel *c;
u64 msatoshi_avail;
/* Do we know about this peer? */
peer = peer_by_id(ld, &inchans[i].pubkey);
if (!peer)
continue;
/* Does it have a channel in state CHANNELD_NORMAL */
c = peer_normal_channel(peer);
if (!c)
continue;
/* Does it have sufficient capacity. */
msatoshi_avail = c->funding_satoshi * 1000 - c->our_msatoshi;
/* Even after reserve taken into account */
if (c->our_config.channel_reserve_satoshis * 1000
> msatoshi_avail)
continue;
msatoshi_avail -= c->our_config.channel_reserve_satoshis * 1000;
if (msatoshi_avail < capacity_needed)
continue;
/* Is it offline? */
if (c->owner == NULL) {
*any_offline = true;
continue;
}
/* Avoid divide-by-zero corner case. */
wsum += (msatoshi_avail - capacity_needed + 1);
if (pseudorand(1ULL << 32)
<= ((msatoshi_avail - capacity_needed + 1) << 32) / wsum)
r = &inchans[i];
}
if (!r)
return NULL;
ret = tal_arr(ctx, struct route_info *, 1);
ret[0] = tal_dup(ret, struct route_info, r);
return ret;
}
/* Encapsulating struct while we wait for gossipd to give us incoming channels */
struct invoice_info {
struct command *cmd;
struct preimage payment_preimage;
struct bolt11 *b11;
struct json_escaped *label;
};
static void gossipd_incoming_channels_reply(struct subd *gossipd,
const u8 *msg,
const int *fs,
struct invoice_info *info)
{
struct json_stream *response;
struct route_info *inchans;
bool any_offline;
struct invoice invoice;
char *b11enc;
const struct invoice_details *details;
struct wallet *wallet = info->cmd->ld->wallet;
if (!fromwire_gossip_get_incoming_channels_reply(tmpctx, msg, &inchans))
fatal("Gossip gave bad GOSSIP_GET_INCOMING_CHANNELS_REPLY %s",
tal_hex(msg, msg));
info->b11->routes
= select_inchan(info->b11,
info->cmd->ld,
info->b11->msatoshi ? *info->b11->msatoshi : 1,
inchans,
&any_offline);
/* FIXME: add private routes if necessary! */
b11enc = bolt11_encode(info, info->b11, false,
hsm_sign_b11, info->cmd->ld);
/* Check duplicate preimage (unlikely unless they specified it!) */
if (wallet_invoice_find_by_rhash(wallet,
&invoice, &info->b11->payment_hash)) {
was_pending(command_fail(info->cmd,
INVOICE_PREIMAGE_ALREADY_EXISTS,
"preimage already used"));
return;
}
if (!wallet_invoice_create(wallet,
&invoice,
info->b11->msatoshi,
info->label,
info->b11->expiry,
b11enc,
info->b11->description,
&info->payment_preimage,
&info->b11->payment_hash)) {
was_pending(command_fail(info->cmd, INVOICE_LABEL_ALREADY_EXISTS,
"Duplicate label '%s'",
info->label->s));
return;
}
/* Get details */
details = wallet_invoice_details(info, wallet, invoice);
response = json_stream_success(info->cmd);
json_object_start(response, NULL);
json_add_hex(response, "payment_hash", details->rhash.u.u8,
sizeof(details->rhash));
json_add_u64(response, "expires_at", details->expiry_time);
json_add_string(response, "bolt11", details->bolt11);
/* Warn if there's not sufficient incoming capacity. */
if (tal_count(info->b11->routes) == 0) {
log_unusual(info->cmd->ld->log,
"invoice: insufficient incoming capacity for %"PRIu64
" msatoshis%s",
info->b11->msatoshi ? *info->b11->msatoshi : 0,
any_offline
? " (among currently connected peers)" : "");
if (any_offline)
json_add_string(response, "warning_offline",
"No peers with sufficient"
" incoming capacity are connected");
else
json_add_string(response, "warning_capacity",
"No channels have sufficient"
" incoming capacity");
}
json_object_end(response);
was_pending(command_success(info->cmd, response));
}
static struct command_result *json_invoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const jsmntok_t *fallbacks;
const jsmntok_t *preimagetok;
u64 *msatoshi_val;
struct invoice_info *info;
const char *desc_val;
const u8 **fallback_scripts = NULL;
u64 *expiry;
struct sha256 rhash;
info = tal(cmd, struct invoice_info);
info->cmd = cmd;
if (!param(cmd, buffer, params,
p_req("msatoshi", param_msat, &msatoshi_val),
p_req("label", param_label, &info->label),
p_req("description", param_escaped_string, &desc_val),
p_opt_def("expiry", param_u64, &expiry, 3600),
p_opt("fallbacks", param_array, &fallbacks),
p_opt("preimage", param_tok, &preimagetok),
NULL))
return command_param_failed();
if (strlen(info->label->s) > INVOICE_MAX_LABEL_LEN) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Label '%s' over %u bytes", info->label->s,
INVOICE_MAX_LABEL_LEN);
}
if (strlen(desc_val) >= BOLT11_FIELD_BYTE_LIMIT) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Descriptions greater than %d bytes "
"not yet supported "
"(description length %zu)",
BOLT11_FIELD_BYTE_LIMIT,
strlen(desc_val));
}
if (fallbacks) {
const jsmntok_t *i, *end = json_next(fallbacks);
fallback_scripts = tal_arr(cmd, const u8 *, 0);
for (i = fallbacks + 1; i < end; i = json_next(i)) {
struct command_result *r;
r = parse_fallback(cmd, buffer, i,
tal_arr_expand(&fallback_scripts));
if (r)
return r;
}
}
if (preimagetok) {
/* Get secret preimage from user. */
if (!hex_decode(buffer + preimagetok->start,
preimagetok->end - preimagetok->start,
&info->payment_preimage,
sizeof(info->payment_preimage))) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"preimage must be 64 hex digits");
}
} else
/* Generate random secret preimage. */
randombytes_buf(&info->payment_preimage,
sizeof(info->payment_preimage));
/* Generate preimage hash. */
sha256(&rhash, &info->payment_preimage, sizeof(info->payment_preimage));
/* Construct bolt11 string. */
info->b11 = new_bolt11(info, msatoshi_val);
info->b11->chain = get_chainparams(cmd->ld);
info->b11->timestamp = time_now().ts.tv_sec;
info->b11->payment_hash = rhash;
info->b11->receiver_id = cmd->ld->id;
info->b11->min_final_cltv_expiry = cmd->ld->config.cltv_final;
info->b11->expiry = *expiry;
info->b11->description = tal_steal(info->b11, desc_val);
info->b11->description_hash = NULL;
if (fallback_scripts)
info->b11->fallbacks = tal_steal(info->b11, fallback_scripts);
subd_req(cmd, cmd->ld->gossip,
take(towire_gossip_get_incoming_channels(NULL)),
-1, 0, gossipd_incoming_channels_reply, info);
return command_still_pending(cmd);
}
static const struct json_command invoice_command = {
"invoice", json_invoice, "Create an invoice for {msatoshi} with {label} "
"and {description} with optional {expiry} seconds "
"(default 1 hour), optional {fallbacks} address list"
"(default empty list) and optional {preimage} "
"(default autogenerated)"};
AUTODATA(json_command, &invoice_command);
static void json_add_invoices(struct json_stream *response,
struct wallet *wallet,
const struct json_escaped *label)
{
struct invoice_iterator it;
const struct invoice_details *details;
/* Don't iterate entire db if we're just after one. */
if (label) {
struct invoice invoice;
if (wallet_invoice_find_by_label(wallet, &invoice, label)) {
details = wallet_invoice_details(response, wallet, invoice);
json_add_invoice(response, details);
}
return;
}
memset(&it, 0, sizeof(it));
while (wallet_invoice_iterate(wallet, &it)) {
details = wallet_invoice_iterator_deref(response, wallet, &it);
json_add_invoice(response, details);
}
}
static struct command_result *json_listinvoices(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct json_escaped *label;
struct json_stream *response;
struct wallet *wallet = cmd->ld->wallet;
if (!param(cmd, buffer, params,
p_opt("label", param_label, &label),
NULL))
return command_param_failed();
response = json_stream_success(cmd);
json_object_start(response, NULL);
json_array_start(response, "invoices");
json_add_invoices(response, wallet, label);
json_array_end(response);
json_object_end(response);
return command_success(cmd, response);
}
static const struct json_command listinvoices_command = {
"listinvoices",
json_listinvoices,
"Show invoice {label} (or all, if no {label})"
};
AUTODATA(json_command, &listinvoices_command);
static struct command_result *json_delinvoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct invoice i;
const struct invoice_details *details;
struct json_stream *response;
const char *status, *actual_status;
struct json_escaped *label;
struct wallet *wallet = cmd->ld->wallet;
if (!param(cmd, buffer, params,
p_req("label", param_label, &label),
p_req("status", param_string, &status),
NULL))
return command_param_failed();
if (!wallet_invoice_find_by_label(wallet, &i, label)) {
return command_fail(cmd, LIGHTNINGD, "Unknown invoice");
}
details = wallet_invoice_details(cmd, cmd->ld->wallet, i);
/* This is time-sensitive, so only call once; otherwise error msg
* might not make sense if it changed! */
actual_status = invoice_status_str(details);
if (!streq(actual_status, status)) {
return command_fail(cmd, LIGHTNINGD,
"Invoice status is %s not %s",
actual_status, status);
}
if (!wallet_invoice_delete(wallet, i)) {
log_broken(cmd->ld->log,
"Error attempting to remove invoice %"PRIu64,
i.id);
return command_fail(cmd, LIGHTNINGD, "Database error");
}
response = json_stream_success(cmd);
json_add_invoice(response, details);
return command_success(cmd, response);
}
static const struct json_command delinvoice_command = {
"delinvoice",
json_delinvoice,
"Delete unpaid invoice {label} with {status}",
};
AUTODATA(json_command, &delinvoice_command);
static struct command_result *json_delexpiredinvoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
u64 *maxexpirytime;
if (!param(cmd, buffer, params,
p_opt_def("maxexpirytime", param_u64, &maxexpirytime,
time_now().ts.tv_sec),
NULL))
return command_param_failed();
wallet_invoice_delete_expired(cmd->ld->wallet, *maxexpirytime);
return command_success(cmd, null_response(cmd));
}
static const struct json_command delexpiredinvoice_command = {
"delexpiredinvoice",
json_delexpiredinvoice,
"Delete all expired invoices that expired as of given {maxexpirytime} (a UNIX epoch time), or all expired invoices if not specified"
};
AUTODATA(json_command, &delexpiredinvoice_command);
static struct command_result *json_autocleaninvoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
u64 *cycle;
u64 *exby;
if (!param(cmd, buffer, params,
p_opt_def("cycle_seconds", param_u64, &cycle, 3600),
p_opt_def("expired_by", param_u64, &exby, 86400),
NULL))
return command_param_failed();
wallet_invoice_autoclean(cmd->ld->wallet, *cycle, *exby);
return command_success(cmd, null_response(cmd));
}
static const struct json_command autocleaninvoice_command = {
"autocleaninvoice",
json_autocleaninvoice,
"Set up autoclean of expired invoices. "
"Perform cleanup every {cycle_seconds} (default 3600), or disable autoclean if 0. "
"Clean up expired invoices that have expired for {expired_by} seconds (default 86400). "
};
AUTODATA(json_command, &autocleaninvoice_command);
static struct command_result *json_waitanyinvoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
u64 *pay_index;
struct wallet *wallet = cmd->ld->wallet;
if (!param(cmd, buffer, params,
p_opt_def("lastpay_index", param_u64, &pay_index, 0),
NULL))
return command_param_failed();
/* Set command as pending. We do not know if
* wallet_invoice_waitany will return immediately
* or not, so indicating pending is safest. */
fixme_ignore(command_still_pending(cmd));
/* Find next paid invoice. */
wallet_invoice_waitany(cmd, wallet, *pay_index,
&wait_on_invoice, (void*) cmd);
return command_its_complicated("wallet_invoice_waitany might complete"
" immediately, but we also call it as a"
" callback so plumbing through the return"
" is non-trivial.");
}
static const struct json_command waitanyinvoice_command = {
"waitanyinvoice",
json_waitanyinvoice,
"Wait for the next invoice to be paid, after {lastpay_index} (if supplied)"
};
AUTODATA(json_command, &waitanyinvoice_command);
/* Wait for an incoming payment matching the `label` in the JSON
* command. This will either return immediately if the payment has
* already been received or it may add the `cmd` to the list of
* waiters, if the payment is still pending.
*/
static struct command_result *json_waitinvoice(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct invoice i;
const struct invoice_details *details;
struct wallet *wallet = cmd->ld->wallet;
struct json_escaped *label;
if (!param(cmd, buffer, params,
p_req("label", param_label, &label),
NULL))
return command_param_failed();
if (!wallet_invoice_find_by_label(wallet, &i, label)) {
return command_fail(cmd, LIGHTNINGD, "Label not found");
}
details = wallet_invoice_details(cmd, cmd->ld->wallet, i);
/* If paid or expired return immediately */
if (details->state == PAID || details->state == EXPIRED) {
return tell_waiter(cmd, &i);
} else {
/* There is an unpaid one matching, let's wait... */
fixme_ignore(command_still_pending(cmd));
wallet_invoice_waitone(cmd, wallet, i,
&wait_on_invoice, (void *) cmd);
return command_its_complicated("wallet_invoice_waitone might"
" complete immediately");
}
}
static const struct json_command waitinvoice_command = {
"waitinvoice",
json_waitinvoice,
"Wait for an incoming payment matching the invoice with {label}, or if the invoice expires"
};
AUTODATA(json_command, &waitinvoice_command);
static void json_add_fallback(struct json_stream *response,
const char *fieldname,
const u8 *fallback,
const struct chainparams *chain)
{
struct bitcoin_address pkh;
struct ripemd160 sh;
struct sha256 wsh;
json_object_start(response, fieldname);
if (is_p2pkh(fallback, &pkh)) {
json_add_string(response, "type", "P2PKH");
json_add_string(response, "addr",
bitcoin_to_base58(tmpctx, chain->testnet, &pkh));
} else if (is_p2sh(fallback, &sh)) {
json_add_string(response, "type", "P2SH");
json_add_string(response, "addr",
p2sh_to_base58(tmpctx, chain->testnet, &sh));
} else if (is_p2wpkh(fallback, &pkh)) {
char out[73 + strlen(chain->bip173_name)];
json_add_string(response, "type", "P2WPKH");
if (segwit_addr_encode(out, chain->bip173_name, 0,
(const u8 *)&pkh, sizeof(pkh)))
json_add_string(response, "addr", out);
} else if (is_p2wsh(fallback, &wsh)) {
char out[73 + strlen(chain->bip173_name)];
json_add_string(response, "type", "P2WSH");
if (segwit_addr_encode(out, chain->bip173_name, 0,
(const u8 *)&wsh, sizeof(wsh)))
json_add_string(response, "addr", out);
}
json_add_hex_talarr(response, "hex", fallback);
json_object_end(response);
}
static struct command_result *json_decodepay(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct bolt11 *b11;
struct json_stream *response;
const char *str, *desc;
char *fail;
if (!param(cmd, buffer, params,
p_req("bolt11", param_string, &str),
p_opt("description", param_string, &desc),
NULL))
return command_param_failed();
b11 = bolt11_decode(cmd, str, desc, &fail);
if (!b11) {
return command_fail(cmd, LIGHTNINGD, "Invalid bolt11: %s", fail);
}
response = json_stream_success(cmd);
json_object_start(response, NULL);
json_add_string(response, "currency", b11->chain->bip173_name);
json_add_u64(response, "created_at", b11->timestamp);
json_add_u64(response, "expiry", b11->expiry);
json_add_pubkey(response, "payee", &b11->receiver_id);
if (b11->msatoshi)
json_add_u64(response, "msatoshi", *b11->msatoshi);
if (b11->description) {
struct json_escaped *esc = json_escape(NULL, b11->description);
json_add_escaped_string(response, "description", take(esc));
}
if (b11->description_hash)
json_add_hex(response, "description_hash",
b11->description_hash,
sizeof(*b11->description_hash));
json_add_num(response, "min_final_cltv_expiry",
b11->min_final_cltv_expiry);
if (tal_count(b11->fallbacks)) {
json_array_start(response, "fallbacks");
for (size_t i = 0; i < tal_count(b11->fallbacks); i++)
json_add_fallback(response, NULL,
b11->fallbacks[i], b11->chain);
json_array_end(response);
}
if (tal_count(b11->routes)) {
size_t i, n;
json_array_start(response, "routes");
for (i = 0; i < tal_count(b11->routes); i++) {
json_array_start(response, NULL);
for (n = 0; n < tal_count(b11->routes[i]); n++) {
json_object_start(response, NULL);
json_add_pubkey(response, "pubkey",
&b11->routes[i][n].pubkey);
json_add_short_channel_id(response,
"short_channel_id",
&b11->routes[i][n]
.short_channel_id);
json_add_u64(response, "fee_base_msat",
b11->routes[i][n].fee_base_msat);
json_add_u64(response, "fee_proportional_millionths",
b11->routes[i][n].fee_proportional_millionths);
json_add_num(response, "cltv_expiry_delta",
b11->routes[i][n]
.cltv_expiry_delta);
json_object_end(response);
}
json_array_end(response);
}
json_array_end(response);
}
if (!list_empty(&b11->extra_fields)) {
struct bolt11_field *extra;
json_array_start(response, "extra");
list_for_each(&b11->extra_fields, extra, list) {
char *data = tal_arr(cmd, char, tal_count(extra->data)+1);
size_t i;
for (i = 0; i < tal_count(extra->data); i++)
data[i] = bech32_charset[extra->data[i]];
data[i] = '\0';
json_object_start(response, NULL);
json_add_string(response, "tag",
tal_fmt(data, "%c", extra->tag));
json_add_string(response, "data", data);
tal_free(data);
json_object_end(response);
}
json_array_end(response);
}
json_add_hex(response, "payment_hash",
&b11->payment_hash, sizeof(b11->payment_hash));
json_add_string(response, "signature",
type_to_string(cmd, secp256k1_ecdsa_signature,
&b11->sig));
json_object_end(response);
return command_success(cmd, response);
}
static const struct json_command decodepay_command = {
"decodepay",
json_decodepay,
"Decode {bolt11}, using {description} if necessary"
};
AUTODATA(json_command, &decodepay_command);