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invoice.c
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invoice.c
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#include "invoice.h"
#include <bitcoin/address.h>
#include <bitcoin/base58.h>
#include <bitcoin/script.h>
#include <ccan/array_size/array_size.h>
#include <ccan/json_escape/json_escape.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <common/amount.h>
#include <common/bech32.h>
#include <common/bolt11.h>
#include <common/configdir.h>
#include <common/features.h>
#include <common/json_command.h>
#include <common/json_helpers.h>
#include <common/jsonrpc_errors.h>
#include <common/overflows.h>
#include <common/param.h>
#include <common/pseudorand.h>
#include <common/timeout.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/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/plugin_hook.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_add_escaped_string(response, "label", inv->label);
json_add_string(response, "bolt11", inv->bolt11);
json_add_sha256(response, "payment_hash", &inv->rhash);
if (inv->msat)
json_add_amount_msat_compat(response, *inv->msat,
"msatoshi", "amount_msat");
json_add_string(response, "status", invoice_status_str(inv));
if (inv->state == PAID) {
json_add_u64(response, "pay_index", inv->pay_index);
json_add_amount_msat_compat(response, inv->received,
"msatoshi_received",
"amount_received_msat");
json_add_u64(response, "paid_at", inv->paid_timestamp);
json_add_preimage(response, "payment_preimage", &inv->r);
}
if (inv->description)
json_add_string(response, "description", inv->description);
json_add_u64(response, "expires_at", inv->expiry_time);
}
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 {
response = json_stream_fail(cmd, INVOICE_EXPIRED_DURING_WAIT,
"invoice expired during wait");
json_add_invoice(response, details);
json_object_end(response);
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 void wait_timed_out(struct command *cmd)
{
was_pending(command_fail(cmd, INVOICE_WAIT_TIMED_OUT,
"Timed out while waiting "
"for invoice to be paid"));
}
/* We derive invoice secret using 1-way function from payment_preimage
* (just a different one from the payment_hash!) */
static void invoice_secret(const struct preimage *payment_preimage,
struct secret *payment_secret)
{
struct preimage modified;
struct sha256 secret;
modified = *payment_preimage;
modified.r[0] ^= 1;
sha256(&secret, modified.r,
ARRAY_SIZE(modified.r) * sizeof(*modified.r));
BUILD_ASSERT(sizeof(secret.u.u8) == sizeof(payment_secret->data));
memcpy(payment_secret->data, secret.u.u8, sizeof(secret.u.u8));
}
struct invoice_payment_hook_payload {
struct lightningd *ld;
/* Set to NULL if it is deleted while waiting for plugin */
struct htlc_set *set;
/* What invoice it's trying to pay. */
const struct json_escape *label;
/* Amount it's offering. */
struct amount_msat msat;
/* Preimage we'll give it if succeeds. */
struct preimage preimage;
/* FIXME: Include raw payload! */
};
static void
invoice_payment_serialize(struct invoice_payment_hook_payload *payload,
struct json_stream *stream)
{
json_object_start(stream, "payment");
json_add_escaped_string(stream, "label", payload->label);
json_add_preimage(stream, "preimage", &payload->preimage);
json_add_string(stream, "msat",
type_to_string(tmpctx, struct amount_msat,
&payload->msat));
json_object_end(stream); /* .payment */
}
/* Set times out or HTLC deleted? Remove set ptr from payload so we
* know to ignore plugin return */
static void invoice_payload_remove_set(struct htlc_set *set,
struct invoice_payment_hook_payload *payload)
{
assert(payload->set == set);
payload->set = NULL;
}
static bool hook_gives_failcode(struct log *log,
const char *buffer,
const jsmntok_t *toks,
enum onion_type *failcode)
{
const jsmntok_t *resulttok;
const jsmntok_t *t;
unsigned int val;
/* No plugin registered on hook at all? */
if (!buffer)
return false;
resulttok = json_get_member(buffer, toks, "result");
if (resulttok) {
if (json_tok_streq(buffer, resulttok, "continue")) {
return false;
} else if (json_tok_streq(buffer, resulttok, "reject")) {
*failcode = WIRE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS;
return true;
} else
fatal("Invalid invoice_payment hook result: %.*s",
toks[0].end - toks[0].start, buffer);
}
t = json_get_member(buffer, toks, "failure_code");
#ifdef COMPAT_V080
if (!t && deprecated_apis) {
static bool warned = false;
if (!warned) {
warned = true;
log_unusual(log,
"Plugin did not return object with "
"'result' or 'failure_code' fields. "
"This is now deprecated and you should "
"return {'result': 'continue' } or "
"{'result': 'reject'} or "
"{'failure_code': 42} instead.");
}
return false;
}
#endif /* defined(COMPAT_V080) */
if (!t)
fatal("Invalid invoice_payment_hook response, expecting "
"'result' or 'failure_code' field: %.*s",
toks[0].end - toks[0].start, buffer);
if (!json_to_number(buffer, t, &val))
fatal("Invalid invoice_payment_hook failure_code: %.*s",
toks[0].end - toks[1].start, buffer);
/* UPDATE isn't valid for final nodes to return, and I think
* we assert elsewhere that we don't do this! */
if (val & UPDATE)
fatal("Invalid invoice_payment_hook UPDATE failure_code: %.*s",
toks[0].end - toks[1].start, buffer);
*failcode = val;
return true;
}
static void
invoice_payment_hook_cb(struct invoice_payment_hook_payload *payload,
const char *buffer,
const jsmntok_t *toks)
{
struct lightningd *ld = payload->ld;
struct invoice invoice;
enum onion_type failcode;
/* We notify here to benefit from the payload and because the hook callback is
* called even if the hook is not registered. */
notify_invoice_payment(ld, payload->msat, payload->preimage, payload->label);
tal_del_destructor2(payload->set, invoice_payload_remove_set, payload);
/* We want to free this, whatever happens. */
tal_steal(tmpctx, payload);
/* If peer dies or something, this can happen. */
if (!payload->set) {
log_debug(ld->log, "invoice '%s' paying htlc_in has gone!",
payload->label->s);
return;
}
/* If invoice gets paid meanwhile (plugin responds out-of-order?) then
* we can also fail */
if (!wallet_invoice_find_by_label(ld->wallet, &invoice, payload->label)) {
failcode = WIRE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS;
htlc_set_fail(payload->set, failcode);
return;
}
/* Did we have a hook result? */
if (hook_gives_failcode(ld->log, buffer, toks, &failcode)) {
htlc_set_fail(payload->set, failcode);
return;
}
log_info(ld->log, "Resolved invoice '%s' with amount %s in %zu htlcs",
payload->label->s,
type_to_string(tmpctx, struct amount_msat, &payload->msat),
tal_count(payload->set->htlcs));
wallet_invoice_resolve(ld->wallet, invoice, payload->msat);
htlc_set_fulfill(payload->set, &payload->preimage);
}
REGISTER_PLUGIN_HOOK(invoice_payment,
PLUGIN_HOOK_SINGLE,
invoice_payment_hook_cb,
struct invoice_payment_hook_payload *,
invoice_payment_serialize,
struct invoice_payment_hook_payload *);
const struct invoice_details *
invoice_check_payment(const tal_t *ctx,
struct lightningd *ld,
const struct sha256 *payment_hash,
const struct amount_msat msat,
const struct secret *payment_secret)
{
struct invoice invoice;
const struct invoice_details *details;
/* BOLT #4:
* - if the payment hash has already been paid:
* - MAY treat the payment hash as unknown.
* - MAY succeed in accepting the HTLC.
*...
* - if the payment hash is unknown:
* - MUST fail the HTLC.
* - MUST return an `incorrect_or_unknown_payment_details` error.
*/
if (!wallet_invoice_find_unpaid(ld->wallet, &invoice, payment_hash))
return NULL;
details = wallet_invoice_details(ctx, ld->wallet, invoice);
/* BOLT #4:
* - if the `payment_secret` doesn't match the expected value for that
* `payment_hash`, or the `payment_secret` is required and is not
* present:
* - MUST fail the HTLC.
*/
if (feature_is_set(details->features, COMPULSORY_FEATURE(OPT_VAR_ONION))
&& !payment_secret)
return tal_free(details);
if (payment_secret) {
struct secret expected;
invoice_secret(&details->r, &expected);
if (!secret_eq_consttime(payment_secret, &expected))
return tal_free(details);
}
/* BOLT #4:
*
* An _intermediate hop_ MUST NOT, but the _final node_:
*...
* - if the amount paid is less than the amount expected:
* - MUST fail the HTLC.
*/
if (details->msat != NULL) {
struct amount_msat twice;
if (amount_msat_less(msat, *details->msat))
return tal_free(details);
if (amount_msat_add(&twice, *details->msat, *details->msat)
&& amount_msat_greater(msat, twice)) {
/* BOLT #4:
*
* - if the amount paid is more than twice the amount
* expected:
* - SHOULD fail the HTLC.
*/
return tal_free(details);
}
}
return details;
}
void invoice_try_pay(struct lightningd *ld,
struct htlc_set *set,
const struct invoice_details *details)
{
struct invoice_payment_hook_payload *payload;
payload = tal(ld, struct invoice_payment_hook_payload);
payload->ld = ld;
payload->label = tal_steal(payload, details->label);
payload->msat = set->so_far;
payload->preimage = details->r;
payload->set = set;
tal_add_destructor2(set, invoice_payload_remove_set, payload);
plugin_hook_call_invoice_payment(ld, payload, payload);
}
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_to_address_scriptpubkey(cmd,
chainparams,
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",
chainparams->network_name);
}
return NULL;
}
/*
* From array of incoming channels [inchan], find suitable ones for
* a payment-to-us of [amount_needed], using criteria:
* 1. Channel's peer is known, in state CHANNELD_NORMAL and is online.
* 2. Channel's peer capacity to pay us is sufficient.
*
* Then use weighted reservoir sampling, which makes probing channel balances
* harder, to choose one channel from the set of suitable channels. It favors
* channels that have less balance on our side as fraction of their capacity.
*
* [any_offline] is set if the peer of any suitable channel appears offline.
*/
static struct route_info **select_inchan(const tal_t *ctx,
struct lightningd *ld,
struct amount_msat amount_needed,
const struct route_info *inchans,
const bool *deadends,
bool *any_offline)
{
/* BOLT11 struct wants an array of arrays (can provide multiple routes) */
struct route_info **R;
double wsum, p;
struct sample {
const struct route_info *route;
double weight;
};
struct sample *S = tal_arr(tmpctx, struct sample, 0);
*any_offline = false;
/* Collect suitable channels and assign each a weight. */
for (size_t i = 0; i < tal_count(inchans); i++) {
struct peer *peer;
struct channel *c;
struct sample sample;
struct amount_msat their_msat, capacity_to_pay_us, excess, capacity;
struct amount_sat cumulative_reserve;
double excess_frac;
/* 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;
/* Is it a dead-end? */
if (deadends[i])
continue;
/* Channel balance as seen by our node:
|<----------------- capacity ----------------->|
. .
. |<------------------ their_msat -------------------->|
. | . |
. |<----- capacity_to_pay_us ----->|<- their_reserve ->|
. | | |
. |<- amount_needed --><- excess ->| |
. | | |
|-------|-------------|--------------------------------|-------------------|
0 ^ ^ ^ funding
our_reserve our_msat */
/* Does the peer have sufficient balance to pay us. */
if (!amount_sat_sub_msat(&their_msat, c->funding, c->our_msat)) {
log_broken(ld->log,
"underflow: funding %s - our_msat %s",
type_to_string(tmpctx, struct amount_sat,
&c->funding),
type_to_string(tmpctx, struct amount_msat,
&c->our_msat));
continue;
}
/* Even after taken into account their reserve */
if (!amount_msat_sub_sat(&capacity_to_pay_us, their_msat,
c->our_config.channel_reserve))
continue;
if (!amount_msat_sub(&excess, capacity_to_pay_us, amount_needed))
continue;
/* Is it offline? */
if (c->owner == NULL) {
*any_offline = true;
continue;
}
/* Find capacity and calculate its excess fraction */
if (!amount_sat_add(&cumulative_reserve,
c->our_config.channel_reserve,
c->channel_info.their_config.channel_reserve)
|| !amount_sat_to_msat(&capacity, c->funding)
|| !amount_msat_sub_sat(&capacity, capacity, cumulative_reserve)) {
log_broken(ld->log, "Channel %s capacity overflow!",
type_to_string(tmpctx, struct short_channel_id, c->scid));
continue;
}
excess_frac = (double)excess.millisatoshis / capacity.millisatoshis; /* Raw: double fraction */
sample.route = &inchans[i];
sample.weight = excess_frac;
tal_arr_expand(&S, sample);
}
if (!tal_count(S))
return NULL;
/* Use weighted reservoir sampling, see:
* https://en.wikipedia.org/wiki/Reservoir_sampling#Algorithm_A-Chao
* But (currently) the result will consist of only one sample (k=1) */
R = tal_arr(ctx, struct route_info *, 1);
R[0] = tal_dup(R, struct route_info, S[0].route);
wsum = S[0].weight;
for (size_t i = 1; i < tal_count(S); i++) {
wsum += S[i].weight;
p = S[i].weight / wsum;
double random_1 = pseudorand_double(); /* range [0,1) */
if (random_1 <= p)
R[0] = tal_dup(R, struct route_info, S[i].route);
}
return R;
}
/* Encapsulating struct while we wait for gossipd to give us incoming channels */
struct chanhints {
bool expose_all_private;
struct short_channel_id *hints;
};
struct invoice_info {
struct command *cmd;
struct preimage payment_preimage;
struct bolt11 *b11;
struct json_escape *label;
struct chanhints *chanhints;
};
static void append_routes(struct route_info **dst, const struct route_info *src)
{
size_t n = tal_count(*dst);
tal_resize(dst, n + tal_count(src));
memcpy(*dst + n, src, tal_count(src) * sizeof(*src));
}
static void append_bools(bool **dst, const bool *src)
{
size_t n = tal_count(*dst);
tal_resize(dst, n + tal_count(src));
memcpy(*dst + n, src, tal_count(src) * sizeof(*src));
}
static bool all_true(const bool *barr, size_t n)
{
for (size_t i = 0; i < n; i++) {
if (!barr[i])
return false;
}
return true;
}
static bool scid_in_arr(const struct short_channel_id *scidarr,
const struct short_channel_id *scid)
{
for (size_t i = 0; i < tal_count(scidarr); i++)
if (short_channel_id_eq(&scidarr[i], scid))
return true;
return false;
}
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, *private;
bool *inchan_deadends, *private_deadends;
bool any_offline;
struct invoice invoice;
char *b11enc;
const struct invoice_details *details;
struct wallet *wallet = info->cmd->ld->wallet;
const struct chanhints *chanhints = info->chanhints;
if (!fromwire_gossip_get_incoming_channels_reply(tmpctx, msg,
&inchans,
&inchan_deadends,
&private,
&private_deadends))
fatal("Gossip gave bad GOSSIP_GET_INCOMING_CHANNELS_REPLY %s",
tal_hex(msg, msg));
/* fromwire explicitly makes empty arrays into NULL */
if (!inchans) {
inchans = tal_arr(tmpctx, struct route_info, 0);
inchan_deadends = tal_arr(tmpctx, bool, 0);
}
if (chanhints && chanhints->expose_all_private) {
append_routes(&inchans, private);
append_bools(&inchan_deadends, private_deadends);
} else if (chanhints && chanhints->hints) {
/* Start by considering all channels as candidates */
append_routes(&inchans, private);
append_bools(&inchan_deadends, private_deadends);
/* Consider only hints they gave */
for (size_t i = 0; i < tal_count(inchans); i++) {
if (!scid_in_arr(chanhints->hints,
&inchans[i].short_channel_id)) {
tal_arr_remove(&inchans, i);
tal_arr_remove(&inchan_deadends, i);
}
}
/* If they told us to use scids and we couldn't, fail. */
if (tal_count(inchans) == 0
&& tal_count(chanhints->hints) != 0) {
was_pending(command_fail(info->cmd,
INVOICE_HINTS_GAVE_NO_ROUTES,
"None of those hints were suitable local channels"));
return;
}
} else {
assert(!chanhints);
/* By default, only consider private channels if there are
* no public channels *at all* */
if (tal_count(inchans) == 0) {
append_routes(&inchans, private);
append_bools(&inchan_deadends, private_deadends);
}
}
#if DEVELOPER
/* dev-routes overrides this. */
any_offline = false;
if (!info->b11->routes)
#endif
info->b11->routes
= select_inchan(info->b11,
info->cmd->ld,
info->b11->msat ? *info->b11->msat : AMOUNT_MSAT(1),
inchans,
inchan_deadends,
&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->msat,
info->label,
info->b11->expiry,
b11enc,
info->b11->description,
info->b11->features,
&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_add_sha256(response, "payment_hash", &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 %s%s",
info->b11->msat
? type_to_string(tmpctx, struct amount_msat,
info->b11->msat)
: "0",
any_offline
? " (among currently connected peers)" : "");
if (tal_count(inchans) == 0)
json_add_string(response, "warning_capacity",
"No channels");
else if (all_true(inchan_deadends, tal_count(inchans)))
json_add_string(response, "warning_deadends",
"No channel with a peer that is not a dead end");
else if (any_offline)
json_add_string(response, "warning_offline",
"No channel with a peer that is currently connected"
" has sufficient incoming capacity");
else
json_add_string(response, "warning_capacity",
"No channel with a peer that has sufficient incoming capacity");
}
was_pending(command_success(info->cmd, response));
}
#if DEVELOPER
/* Since this is a dev-only option, we will crash if dev-routes is not
* an array-of-arrays-of-correct-items. */
static struct route_info *unpack_route(const tal_t *ctx,
const char *buffer,
const jsmntok_t *routetok)
{
const jsmntok_t *t;
size_t i;
struct route_info *route = tal_arr(ctx, struct route_info, routetok->size);
json_for_each_arr(i, t, routetok) {
const jsmntok_t *pubkey, *fee_base, *fee_prop, *scid, *cltv;
struct route_info *r = &route[i];
u32 cltv_u32;
pubkey = json_get_member(buffer, t, "id");
scid = json_get_member(buffer, t, "short_channel_id");
fee_base = json_get_member(buffer, t, "fee_base_msat");
fee_prop = json_get_member(buffer, t,
"fee_proportional_millionths");
cltv = json_get_member(buffer, t, "cltv_expiry_delta");
if (!json_to_node_id(buffer, pubkey, &r->pubkey)
|| !json_to_short_channel_id(buffer, scid,
&r->short_channel_id)
|| !json_to_number(buffer, fee_base, &r->fee_base_msat)
|| !json_to_number(buffer, fee_prop,
&r->fee_proportional_millionths)
|| !json_to_number(buffer, cltv, &cltv_u32))
abort();
/* We don't have a json_to_u16 */
r->cltv_expiry_delta = cltv_u32;
}
return route;
}
static struct route_info **unpack_routes(const tal_t *ctx,
const char *buffer,
const jsmntok_t *routestok)
{
struct route_info **routes;
const jsmntok_t *t;
size_t i;
if (!routestok)
return NULL;
routes = tal_arr(ctx, struct route_info *, routestok->size);
json_for_each_arr(i, t, routestok)
routes[i] = unpack_route(routes, buffer, t);
return routes;
}
#endif /* DEVELOPER */
static struct command_result *param_msat_or_any(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct amount_msat **msat)
{
if (json_tok_streq(buffer, tok, "any")) {
*msat = NULL;
return NULL;
}
*msat = tal(cmd, struct amount_msat);
if (parse_amount_msat(*msat, buffer + tok->start, tok->end - tok->start))
return NULL;
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be millisatoshis or 'any', not '%.*s'",
name,
tok->end - tok->start,
buffer + tok->start);
}
/* Parse time with optional suffix, return seconds */
static struct command_result *param_time(struct command *cmd, const char *name,
const char *buffer,
const jsmntok_t *tok,
uint64_t **secs)
{
/* We need to manipulate this, so make copy */
jsmntok_t timetok = *tok;
u64 mul;
char s;
struct {
char suffix;
u64 mul;
} suffixes[] = {
{ 's', 1 },
{ 'm', 60 },
{ 'h', 60*60 },
{ 'd', 24*60*60 },
{ 'w', 7*24*60*60 } };
mul = 1;
if (timetok.end == timetok.start)
s = '\0';
else
s = buffer[timetok.end - 1];
for (size_t i = 0; i < ARRAY_SIZE(suffixes); i++) {
if (s == suffixes[i].suffix) {
mul = suffixes[i].mul;
timetok.end--;
break;
}
}
*secs = tal(cmd, uint64_t);
if (json_to_u64(buffer, &timetok, *secs)) {
if (mul_overflows_u64(**secs, mul)) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' string '%.*s' is too large",
name, tok->end - tok->start,
buffer + tok->start);
}
**secs *= mul;
return NULL;
}
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a number with optional {s,m,h,d,w} suffix, not '%.*s'",
name, tok->end - tok->start, buffer + tok->start);
}
static struct command_result *param_chanhints(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct chanhints **chanhints)
{
bool boolhint;
*chanhints = tal(cmd, struct chanhints);
/* Could be simply "true" or "false" */
if (json_to_bool(buffer, tok, &boolhint)) {
(*chanhints)->expose_all_private = boolhint;
(*chanhints)->hints
= tal_arr(*chanhints, struct short_channel_id, 0);
return NULL;
}
(*chanhints)->expose_all_private = false;
/* Could be a single short_channel_id or an array */
if (tok->type == JSMN_ARRAY) {
size_t i;
const jsmntok_t *t;
(*chanhints)->hints
= tal_arr(*chanhints, struct short_channel_id,
tok->size);
json_for_each_arr(i, t, tok) {
if (!json_to_short_channel_id(buffer, t,
&(*chanhints)->hints[i])) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be a short channel id, not '%.*s'",
name, json_tok_full_len(t),
json_tok_full(buffer, t));
}
}
return NULL;
}
/* Otherwise should be a short_channel_id */
return param_short_channel_id(cmd, name, buffer, tok,
&(*chanhints)->hints);
}
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;
struct amount_msat *msatoshi_val;
struct invoice_info *info;
const char *desc_val;
const u8 **fallback_scripts = NULL;
u64 *expiry;
struct sha256 rhash;
struct secret payment_secret;
#if DEVELOPER
const jsmntok_t *routes;
#endif
info = tal(cmd, struct invoice_info);
info->cmd = cmd;
if (!param(cmd, buffer, params,
p_req("msatoshi", param_msat_or_any, &msatoshi_val),
p_req("label", param_label, &info->label),
p_req("description", param_escaped_string, &desc_val),
p_opt_def("expiry", param_time, &expiry, 3600*24*7),
p_opt("fallbacks", param_array, &fallbacks),
p_opt("preimage", param_tok, &preimagetok),
p_opt("exposeprivatechannels", param_chanhints,
&info->chanhints),
#if DEVELOPER
p_opt("dev-routes", param_array, &routes),
#endif
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 (msatoshi_val
&& amount_msat_greater(*msatoshi_val, chainparams->max_payment)) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"msatoshi cannot exceed %s",
type_to_string(tmpctx, struct amount_msat,
&chainparams->max_payment));
}
if (fallbacks) {
size_t i;
const jsmntok_t *t;
fallback_scripts = tal_arr(cmd, const u8 *, fallbacks->size);
json_for_each_arr(i, t, fallbacks) {
struct command_result *r;
r = parse_fallback(cmd, buffer, t, &fallback_scripts[i]);
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));
/* Generate payment secret. */
invoice_secret(&info->payment_preimage, &payment_secret);
info->b11 = new_bolt11(info, msatoshi_val);
info->b11->chain = chainparams;
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;