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test_protocol.c
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/* Simple simulator for protocol. */
#include "config.h"
#include <assert.h>
#include <ccan/array_size/array_size.h>
#include <ccan/err/err.h>
#include <ccan/opt/opt.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/short_types/short_types.h>
#include <ccan/str/str.h>
#include <ccan/structeq/structeq.h>
#include <ccan/tal/tal.h>
#include <ccan/tal/str/str.h>
#include <common/utils.h>
#include <inttypes.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/uio.h>
#include <unistd.h>
#define A_LINEX 100
#define B_LINEX 245
#define A_TEXTX 95
#define B_TEXTX 250
#define LINE_HEIGHT 5
#define TEXT_HEIGHT 4
#define STEP_HEIGHT 10
#define LETTER_WIDTH 3
#define TEXT_STYLE "style=\"font-size:4;\""
static bool verbose = false;
struct commit_tx {
/* inhtlcs = htlcs they offered, outhtlcs = htlcs we offered */
u32 inhtlcs, outhtlcs;
/* This is a simple counter, reflecting fee updates. */
u32 fee;
};
/* We keep one for them, one for us. */
struct commit_info {
struct commit_info *prev;
/* How deep we are */
unsigned int number;
/* Have sent/received revocation secret. */
bool revoked;
/* Have their signature, ie. can be broadcast */
bool counterparty_signed;
u16 pad;
/* num_commit_or_revoke when we sent/received this. */
size_t order;
};
/* A "signature" is a copy of the commit tx state, for easy diagnosis. */
struct signature {
struct commit_tx f;
};
/* What are we doing: adding or removing? */
#define ADDING 0x1000
#define REMOVING 0x2000
#define PENDING 0x001 /* Change is pending. */
#define COMMITTED 0x002 /* HTLC is in commit_tx */
#define REVOKED 0x004 /* Old pre-change tx revoked */
#define OWNER 0x020 /* This side owns it */
#define OURS LOCAL(OWNER)
#define THEIRS REMOTE(OWNER)
#define LOCAL_ 0
#define REMOTE_ 6
#define SIDE(flag,local_or_remote) ((flag) << local_or_remote)
#define OTHER_SIDE(flag,local_or_remote) ((flag) << (6 - local_or_remote))
#define LOCAL(flag) SIDE(flag, LOCAL_)
#define REMOTE(flag) SIDE(flag, REMOTE_)
enum htlc_state {
NONEXISTENT = 0,
/* When we add a new htlc, it goes in this order. */
SENT_ADD_HTLC = ADDING + OURS + REMOTE(PENDING),
SENT_ADD_COMMIT = SENT_ADD_HTLC - REMOTE(PENDING) + REMOTE(COMMITTED),
RECV_ADD_REVOCATION = SENT_ADD_COMMIT + REMOTE(REVOKED),
RECV_ADD_ACK_COMMIT = RECV_ADD_REVOCATION + LOCAL(COMMITTED),
SENT_ADD_ACK_REVOCATION = RECV_ADD_ACK_COMMIT + LOCAL(REVOKED) - ADDING,
/* When they remove an htlc, it goes from SENT_ADD_ACK_REVOCATION: */
RECV_REMOVE_HTLC = REMOVING + OURS + LOCAL(PENDING)
+ LOCAL(COMMITTED) + REMOTE(COMMITTED),
RECV_REMOVE_COMMIT = RECV_REMOVE_HTLC - LOCAL(PENDING) - LOCAL(COMMITTED),
SENT_REMOVE_REVOCATION = RECV_REMOVE_COMMIT + LOCAL(REVOKED),
SENT_REMOVE_ACK_COMMIT = SENT_REMOVE_REVOCATION - REMOTE(COMMITTED),
RECV_REMOVE_ACK_REVOCATION = SENT_REMOVE_ACK_COMMIT - REMOVING + REMOTE(REVOKED),
/* When they add a new htlc, it goes in this order. */
RECV_ADD_HTLC = ADDING + THEIRS + LOCAL(PENDING),
RECV_ADD_COMMIT = RECV_ADD_HTLC - LOCAL(PENDING) + LOCAL(COMMITTED),
SENT_ADD_REVOCATION = RECV_ADD_COMMIT + LOCAL(REVOKED),
SENT_ADD_ACK_COMMIT = SENT_ADD_REVOCATION + REMOTE(COMMITTED),
RECV_ADD_ACK_REVOCATION = SENT_ADD_ACK_COMMIT + REMOTE(REVOKED),
/* When we remove an htlc, it goes from RECV_ADD_ACK_REVOCATION: */
SENT_REMOVE_HTLC = REMOVING + THEIRS + REMOTE(PENDING)
+ LOCAL(COMMITTED) + REMOTE(COMMITTED),
SENT_REMOVE_COMMIT = SENT_REMOVE_HTLC - REMOTE(PENDING) - REMOTE(COMMITTED),
RECV_REMOVE_REVOCATION = SENT_REMOVE_COMMIT + REMOTE(REVOKED),
RECV_REMOVE_ACK_COMMIT = RECV_REMOVE_REVOCATION - LOCAL(COMMITTED),
SENT_REMOVE_ACK_REVOCATION = RECV_REMOVE_ACK_COMMIT + LOCAL(REVOKED) - REMOVING
};
static const char *htlc_statename(enum htlc_state state)
{
switch (state) {
case NONEXISTENT: return "NONEXISTENT";
case SENT_ADD_HTLC: return "SENT_ADD_HTLC";
case SENT_ADD_COMMIT: return "SENT_ADD_COMMIT";
case RECV_ADD_REVOCATION: return "RECV_ADD_REVOCATION";
case RECV_ADD_ACK_COMMIT: return "RECV_ADD_ACK_COMMIT";
case SENT_ADD_ACK_REVOCATION: return "SENT_ADD_ACK_REVOCATION";
case RECV_REMOVE_HTLC: return "RECV_REMOVE_HTLC";
case RECV_REMOVE_COMMIT: return "RECV_REMOVE_COMMIT";
case SENT_REMOVE_REVOCATION: return "SENT_REMOVE_REVOCATION";
case SENT_REMOVE_ACK_COMMIT: return "SENT_REMOVE_ACK_COMMIT";
case RECV_REMOVE_ACK_REVOCATION: return "RECV_REMOVE_ACK_REVOCATION";
case RECV_ADD_HTLC: return "RECV_ADD_HTLC";
case RECV_ADD_COMMIT: return "RECV_ADD_COMMIT";
case SENT_ADD_REVOCATION: return "SENT_ADD_REVOCATION";
case SENT_ADD_ACK_COMMIT: return "SENT_ADD_ACK_COMMIT";
case RECV_ADD_ACK_REVOCATION: return "RECV_ADD_ACK_REVOCATION";
case SENT_REMOVE_HTLC: return "SENT_REMOVE_HTLC";
case SENT_REMOVE_COMMIT: return "SENT_REMOVE_COMMIT";
case RECV_REMOVE_REVOCATION: return "RECV_REMOVE_REVOCATION";
case RECV_REMOVE_ACK_COMMIT: return "RECV_REMOVE_ACK_COMMIT";
case SENT_REMOVE_ACK_REVOCATION: return "SENT_REMOVE_ACK_REVOCATION";
}
return tal_fmt(NULL, "UNKNOWN STATE %i", state);
}
static const char *htlc_stateflags(const tal_t *ctx, enum htlc_state state)
{
char *flags = tal_strdup(ctx, "");
#define ADD_STATE(flags, flag) \
if (state & flag) \
tal_append_fmt(&flags, #flag ",");
ADD_STATE(flags, ADDING);
ADD_STATE(flags, REMOVING);
ADD_STATE(flags, OURS);
ADD_STATE(flags, THEIRS);
ADD_STATE(flags, LOCAL(PENDING));
ADD_STATE(flags, LOCAL(COMMITTED));
ADD_STATE(flags, LOCAL(REVOKED));
ADD_STATE(flags, REMOTE(PENDING));
ADD_STATE(flags, REMOTE(COMMITTED));
ADD_STATE(flags, REMOTE(REVOKED));
if (strends(flags, ","))
flags[strlen(flags)-1] = '\0';
return flags;
}
struct htlc {
enum htlc_state state;
/* 0 means this is actually a new fee, not a HTLC. */
unsigned int id;
};
static u32 htlc_mask(unsigned int htlc)
{
if (htlc > 32)
errx(1, "HTLC number %u too large", htlc);
if (!htlc)
errx(1, "HTLC number can't be zero");
return (1U << (htlc-1));
}
/* Make commit tx for local/remote */
static struct commit_tx make_commit_tx(struct htlc **htlcs, int local_or_remote)
{
size_t i, n = tal_count(htlcs);
int committed_flag = SIDE(COMMITTED, local_or_remote);
struct commit_tx tx = { 0, 0, 0 };
for (i = 0; i < n; i++) {
if (!(htlcs[i]->state & committed_flag))
continue;
if (!(htlcs[i]->state & SIDE(OWNER, local_or_remote))) {
/* We don't apply fee changes to each other. */
if (htlcs[i]->id)
tx.outhtlcs |= htlc_mask(htlcs[i]->id);
} else {
if (!htlcs[i]->id)
tx.fee++;
else
tx.inhtlcs |= htlc_mask(htlcs[i]->id);
}
}
return tx;
}
struct database {
/* This keeps *all* our HTLCs, including expired ones. */
size_t num_htlcs;
struct htlc htlcs[100];
/* This counts the number of received commit and revocation pkts. */
size_t last_recv;
size_t last_sent;
/* We keep remote_prev because it might not be revoked, and this
* makes our receive_revoke logic simpler. */
struct commit_info local, remote, remote_prev;
};
struct peer {
const char *name;
int infd, outfd, cmdfd, cmddonefd;
/* For drawing svg */
char *info;
/* What we save on disk. */
struct database db;
/* All htlcs. */
struct htlc **htlcs;
/* Last one is the one we're changing. */
struct commit_info *local, *remote;
};
static void db_update_htlc(struct database *db, const struct htlc *htlc)
{
size_t i;
for (i = 0; i < db->num_htlcs; i++) {
if ((db->htlcs[i].state & (OURS|THEIRS))
!= (htlc->state & (OURS|THEIRS)))
continue;
/* FIXME: This isn't quite right for multiple fee changes. */
if (db->htlcs[i].id == htlc->id)
break;
}
if (i == db->num_htlcs) {
db->num_htlcs++;
if (db->num_htlcs > ARRAY_SIZE(db->htlcs))
errx(1, "Too many htlcs");
}
db->htlcs[i] = *htlc;
}
static void db_recv_local_commit(struct database *db,
const struct commit_info *ci)
{
db->last_recv++;
db->local = *ci;
}
static void db_send_remote_commit(struct peer *peer,
struct database *db,
const struct commit_info *ci,
struct signature sig)
{
if (ci->prev)
db->remote_prev = *ci->prev;
db->remote = *ci;
db->remote.order = ++db->last_sent;
}
static void db_send_local_revoke(struct database *db,
const struct commit_info *ci)
{
db->last_sent++;
}
static void db_recv_remote_revoke(struct database *db,
const struct commit_info *ci)
{
assert(ci->revoked);
db->last_recv++;
db->remote_prev.revoked = true;
/* A real db would save the previous revocation hash here too */
}
static struct htlc *find_htlc(struct peer *peer, unsigned int htlc_id, int side)
{
size_t i, n = tal_count(peer->htlcs);
for (i = 0; i < n; i++) {
if ((peer->htlcs[i]->state & side)
&& peer->htlcs[i]->id == htlc_id)
return peer->htlcs[i];
}
return NULL;
}
static struct htlc *new_htlc(struct peer *peer, unsigned int htlc_id, int side)
{
size_t n = tal_count(peer->htlcs);
/* Fee changes don't have to be unique. */
if (htlc_id && find_htlc(peer, htlc_id, side))
errx(1, "%s: %s duplicate new htlc %u", peer->name,
side == OURS ? "Our" : "Their", htlc_id);
tal_resize(&peer->htlcs, n+1);
peer->htlcs[n] = tal(peer, struct htlc);
peer->htlcs[n]->state = NONEXISTENT;
peer->htlcs[n]->id = htlc_id;
return peer->htlcs[n];
}
static void htlc_changestate(struct peer *peer,
struct htlc *htlc,
bool commit,
enum htlc_state old,
enum htlc_state new)
{
if (htlc->state != old)
errx(1, "%s: htlc was in state %s not %s", peer->name,
htlc_statename(htlc->state), htlc_statename(old));
if (htlc->id) {
if (verbose)
printf("%s: HTLC %u -> %s\n",
peer->name, htlc->id, htlc_statename(new));
tal_append_fmt(&peer->info, "%u:%s\n",
htlc->id, htlc_statename(new));
} else {
if (verbose)
printf("%s: FEE -> %s\n",
peer->name, htlc_statename(new));
tal_append_fmt(&peer->info, "FEE:%s\n",
htlc_statename(new));
}
htlc->state = new;
if (commit)
db_update_htlc(&peer->db, htlc);
}
struct state_table {
enum htlc_state from, to;
};
static bool change_htlcs_(struct peer *peer, bool commit,
const struct state_table *table,
size_t n_table)
{
size_t i, n = tal_count(peer->htlcs);
bool changed = false;
for (i = 0; i < n; i++) {
size_t t;
for (t = 0; t < n_table; t++) {
if (peer->htlcs[i]->state == table[t].from) {
htlc_changestate(peer, peer->htlcs[i], commit,
table[t].from, table[t].to);
changed = true;
break;
}
}
}
return changed;
}
#define change_htlcs(peer, table, commit) \
change_htlcs_((peer), (commit), (table), ARRAY_SIZE(table))
static struct commit_info *new_commit_info(const struct peer *peer,
struct commit_info *prev)
{
struct commit_info *ci = tal(peer, struct commit_info);
ci->prev = prev;
ci->revoked = false;
ci->counterparty_signed = false;
ci->pad = 0;
ci->order = 0;
if (prev)
ci->number = prev->number + 1;
else
ci->number = 0;
return ci;
}
static struct signature commit_sig(const struct commit_tx *commit_tx)
{
struct signature sig;
sig.f = *commit_tx;
return sig;
}
static void write_out(int fd, const void *p, size_t len)
{
if (!write_all(fd, p, len))
err(1, "Writing to peer");
}
static void dump_htlcs(struct htlc **htlcs,
const char *prefix,
bool verbose,
int flags_inc, int flags_exc)
{
size_t i, n = tal_count(htlcs);
const tal_t *ctx = tal_tmpctx(htlcs);
bool printed = false;
for (i = 0; i < n; i++) {
if ((htlcs[i]->state & flags_inc) != flags_inc)
continue;
if (htlcs[i]->state & flags_exc)
continue;
if (!htlcs[i]->id && !verbose)
continue;
if (!printed) {
printf("%s", prefix);
printed = true;
}
if (!htlcs[i]->id)
printf(" FEE");
else
printf(" %u", htlcs[i]->id);
if (verbose) {
printf(" (%s - %s)",
htlc_statename(htlcs[i]->state),
htlc_stateflags(ctx, htlcs[i]->state));
}
}
if (printed)
printf("\n");
tal_free(ctx);
}
static void dump_commit_info(const struct peer *peer,
const struct commit_info *ci,
int local_or_remote)
{
struct commit_tx tx;
int committed_flag = SIDE(COMMITTED, local_or_remote);
tx = make_commit_tx(peer->htlcs, local_or_remote);
printf(" Commit %u:\n", ci->number);
dump_htlcs(peer->htlcs, " Our htlcs:", false,
OURS|committed_flag, 0);
dump_htlcs(peer->htlcs, " Their htlcs:", false,
THEIRS|committed_flag, 0);
/* Don't clutter output if fee level untouched. */
if (tx.fee)
printf(" Fee level %u\n", tx.fee);
dump_htlcs(peer->htlcs, "Pending unacked:", true,
SIDE(PENDING, local_or_remote), committed_flag);
dump_htlcs(peer->htlcs, "Pending acked:", true,
OTHER_SIDE(COMMITTED, local_or_remote), committed_flag);
if (ci->counterparty_signed)
printf(" SIGNED\n");
if (ci->revoked)
printf(" REVOKED\n");
fflush(stdout);
}
static void dump_peer(const struct peer *peer, bool all)
{
printf("LOCAL COMMIT:\n");
dump_commit_info(peer, peer->local, LOCAL_);
printf("REMOTE COMMIT:\n");
dump_commit_info(peer, peer->remote, REMOTE_);
if (all)
dump_htlcs(peer->htlcs, "OLD HTLCs:", true,
0, LOCAL(COMMITTED)|REMOTE(COMMITTED));
}
static void read_in(int fd, void *p, size_t len)
{
alarm(5);
if (!read_all(fd, p, len))
err(1, "Reading from peer");
alarm(0);
}
static void read_peer(struct peer *peer, const char *str, const char *cmd)
{
char *p = tal_arr(peer, char, strlen(str)+1);
read_in(peer->infd, p, strlen(str));
p[strlen(str)] = '\0';
if (!streq(p, str))
errx(1, "%s: %s: Expected %s from peer, got %s",
peer->name, cmd, str, p);
tal_free(p);
}
static void PRINTF_FMT(2,3) record_send(struct peer *peer, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
tal_append_fmt(&peer->info, ">");
tal_append_vfmt(&peer->info, fmt, ap);
tal_append_fmt(&peer->info, "\n");
va_end(ap);
if (verbose) {
va_start(ap, fmt);
printf("%s: SEND ", peer->name);
vprintf(fmt, ap);
printf("\n");
va_end(ap);
}
}
static void PRINTF_FMT(2,3) record_recv(struct peer *peer, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
tal_append_fmt(&peer->info, "<");
tal_append_vfmt(&peer->info, fmt, ap);
tal_append_fmt(&peer->info, "\n");
va_end(ap);
if (verbose) {
va_start(ap, fmt);
printf("%s: RECEIVE ", peer->name);
vprintf(fmt, ap);
printf("\n");
va_end(ap);
}
}
static void xmit_add_htlc(struct peer *peer, const struct htlc *h)
{
record_send(peer, "add_htlc %u", h->id);
write_out(peer->outfd, "+", 1);
write_out(peer->outfd, &h->id, sizeof(h->id));
}
static void xmit_remove_htlc(struct peer *peer, const struct htlc *h)
{
record_send(peer, "fulfill_htlc %u", h->id);
write_out(peer->outfd, "-", 1);
write_out(peer->outfd, &h->id, sizeof(h->id));
}
static void xmit_feechange(struct peer *peer)
{
record_send(peer, "update_fee");
write_out(peer->outfd, "F", 1);
}
static void xmit_commit(struct peer *peer, struct signature sig)
{
record_send(peer, "update_commit");
write_out(peer->outfd, "C", 1);
write_out(peer->outfd, &sig, sizeof(sig));
}
static void xmit_revoke(struct peer *peer, unsigned int number)
{
record_send(peer, "update_revocation");
write_out(peer->outfd, "R", 1);
write_out(peer->outfd, &number, sizeof(number));
}
static void send_offer(struct peer *peer, unsigned int htlc)
{
struct htlc *h = new_htlc(peer, htlc, OURS);
htlc_changestate(peer, h, false, NONEXISTENT, SENT_ADD_HTLC);
xmit_add_htlc(peer, h);
}
static void send_remove(struct peer *peer, unsigned int htlc)
{
struct htlc *h = find_htlc(peer, htlc, THEIRS);
if (!h)
errx(1, "%s: send_remove: htlc %u does not exist",
peer->name, htlc);
htlc_changestate(peer, h, false, RECV_ADD_ACK_REVOCATION, SENT_REMOVE_HTLC);
xmit_remove_htlc(peer, h);
}
static void send_feechange(struct peer *peer)
{
struct htlc *fee = new_htlc(peer, 0, OURS);
htlc_changestate(peer, fee, false, NONEXISTENT, SENT_ADD_HTLC);
xmit_feechange(peer);
}
/*
* We don't enforce the rule that commits have to wait for revoke response
* before the next one.
*/
static struct commit_info *last_unrevoked(struct commit_info *ci)
{
struct commit_info *next = NULL;
/* If this is already revoked, all are. */
if (ci->revoked)
return NULL;
/* Find revoked commit; one we hit before that was last unrevoked. */
for (; ci; next = ci, ci = ci->prev) {
if (ci->revoked)
break;
}
return next;
}
static void send_commit(struct peer *peer)
{
struct commit_tx tx;
struct signature sig;
static const struct state_table changes[] = {
{ SENT_ADD_HTLC, SENT_ADD_COMMIT },
{ SENT_REMOVE_REVOCATION, SENT_REMOVE_ACK_COMMIT },
{ SENT_ADD_REVOCATION, SENT_ADD_ACK_COMMIT},
{ SENT_REMOVE_HTLC, SENT_REMOVE_COMMIT}
};
/* FIXME-OLD #2:
*
* An implementation MAY choose not to send an `update_commit`
* until it receives the `update_revocation` response to the
* previous `update_commit`, so there is only ever one
* unrevoked local commitment. */
if (peer->remote->prev && !peer->remote->prev->revoked)
errx(1, "%s: commit: must wait for previous commit", peer->name);
/* FIXME-OLD #2:
*
* ...a sending node MUST apply all remote acked and unacked
* changes except unacked fee changes to the remote commitment
* before generating `sig`.
*/
if (!change_htlcs(peer, changes, true)) {
/* FIXME-OLD #2:
*
* A node MUST NOT send an `update_commit` message which does
* not include any updates.
*/
errx(1, "%s: commit: no changes to commit", peer->name);
}
tx = make_commit_tx(peer->htlcs, REMOTE_);
sig = commit_sig(&tx);
peer->remote = new_commit_info(peer, peer->remote);
peer->remote->counterparty_signed = true;
db_send_remote_commit(peer, &peer->db, peer->remote, sig);
/* Tell other side about commit and result (it should agree!) */
xmit_commit(peer, sig);
}
static void receive_revoke(struct peer *peer, u32 number)
{
static const struct state_table changes[] = {
{ SENT_ADD_COMMIT, RECV_ADD_REVOCATION },
{ SENT_REMOVE_ACK_COMMIT, RECV_REMOVE_ACK_REVOCATION },
{ SENT_ADD_ACK_COMMIT, RECV_ADD_ACK_REVOCATION },
{ SENT_REMOVE_COMMIT, RECV_REMOVE_REVOCATION }
};
struct commit_info *ci = last_unrevoked(peer->remote);
if (!ci)
errx(1, "%s: receive_revoke: no commit to revoke", peer->name);
if (ci->number != number)
errx(1, "%s: receive_revoke: revoked %u but %u is next",
peer->name, number, ci->number);
/* This shouldn't happen if we don't allow multiple commits. */
if (ci != peer->remote->prev)
errx(1, "%s: receive_revoke: always revoke previous?",
peer->name);
if (ci->revoked)
errx(1, "%s: receive_revoke: already revoked?", peer->name);
record_recv(peer, "update_revocation");
ci->revoked = true;
if (!ci->counterparty_signed)
errx(1, "%s: receive_revoke: revoked unsigned commit?",
peer->name);
if (!change_htlcs(peer, changes, true))
errx(1, "%s: receive_revoke: no changes?", peer->name);
db_recv_remote_revoke(&peer->db, ci);
}
/* FIXME-OLD #2:
*
* the receiving node MUST add the HTLC addition to the unacked
* changeset for its local commitment.
*/
static void receive_offer(struct peer *peer, unsigned int htlc)
{
struct htlc *h = new_htlc(peer, htlc, THEIRS);
htlc_changestate(peer, h, false, NONEXISTENT, RECV_ADD_HTLC);
record_recv(peer, "add_htlc %u", h->id);
}
/* FIXME-OLD #2:
*
* the receiving node MUST add the HTLC fulfill/fail to the unacked
* changeset for its local commitment.
*/
static void receive_remove(struct peer *peer, unsigned int htlc)
{
struct htlc *h = find_htlc(peer, htlc, OURS);
if (!h)
errx(1, "%s: recv_remove: htlc %u does not exist",
peer->name, htlc);
htlc_changestate(peer, h, false, SENT_ADD_ACK_REVOCATION, RECV_REMOVE_HTLC);
record_recv(peer, "fulfill_htlc %u", h->id);
}
/* FIXME-OLD #2:
*
* the receiving node MUST add the fee change to the unacked changeset
* for its local commitment.
*/
static void receive_feechange(struct peer *peer)
{
struct htlc *fee = new_htlc(peer, 0, THEIRS);
htlc_changestate(peer, fee, false, NONEXISTENT, RECV_ADD_HTLC);
record_recv(peer, "update_fee");
}
/* Send revoke.
* - Queue changes to them.
*/
static void send_revoke(struct peer *peer, struct commit_info *ci)
{
static const struct state_table changes[] = {
{ RECV_ADD_ACK_COMMIT, SENT_ADD_ACK_REVOCATION },
{ RECV_REMOVE_COMMIT, SENT_REMOVE_REVOCATION },
{ RECV_ADD_COMMIT, SENT_ADD_REVOCATION },
{ RECV_REMOVE_ACK_COMMIT, SENT_REMOVE_ACK_REVOCATION }
};
/* We always revoke in order. */
assert(!ci->prev || ci->prev->revoked);
assert(ci->counterparty_signed);
assert(!ci->revoked);
ci->revoked = true;
if (!change_htlcs(peer, changes, true))
errx(1, "%s: update_revocation: no changes?", peer->name);
db_send_local_revoke(&peer->db, ci);
xmit_revoke(peer, ci->number);
}
/* Receive commit:
* - Apply changes to us.
*/
static void receive_commit(struct peer *peer, const struct signature *sig)
{
struct commit_tx commit_tx;
struct signature oursig;
static const struct state_table changes[] = {
{ RECV_ADD_REVOCATION, RECV_ADD_ACK_COMMIT },
{ RECV_REMOVE_HTLC, RECV_REMOVE_COMMIT },
{ RECV_ADD_HTLC, RECV_ADD_COMMIT },
{ RECV_REMOVE_REVOCATION, RECV_REMOVE_ACK_COMMIT }
};
record_recv(peer, "update_commit");
/* FIXME-OLD #2:
*
* A node MUST NOT send an `update_commit` message which does
* not include any updates.
*/
if (!change_htlcs(peer, changes, true))
errx(1, "%s: receive_commit: no changes to commit", peer->name);
commit_tx = make_commit_tx(peer->htlcs, LOCAL_);
oursig = commit_sig(&commit_tx);
if (!structeq(sig, &oursig))
errx(1, "%s: Commit state %#x/%#x/%u, they gave %#x/%#x/%u",
peer->name,
sig->f.inhtlcs, sig->f.outhtlcs, sig->f.fee,
oursig.f.inhtlcs, oursig.f.outhtlcs, oursig.f.fee);
peer->local = new_commit_info(peer, peer->local);
peer->local->counterparty_signed = true;
db_recv_local_commit(&peer->db, peer->local);
send_revoke(peer, peer->local->prev);
}
static void resend_updates(struct peer *peer)
{
size_t i;
/* Re-transmit our add, removes and fee changes. */
for (i = 0; i < tal_count(peer->htlcs); i++) {
switch (peer->htlcs[i]->state) {
case SENT_ADD_COMMIT:
if (peer->htlcs[i]->id)
xmit_add_htlc(peer, peer->htlcs[i]);
else
xmit_feechange(peer);
break;
case SENT_REMOVE_COMMIT:
xmit_remove_htlc(peer, peer->htlcs[i]);
break;
default:
break;
}
}
}
static void restore_state(struct peer *peer)
{
size_t i, sent, num_revokes, revoke_idx;
peer->htlcs = tal_arr(peer, struct htlc *, peer->db.num_htlcs);
for (i = 0; i < peer->db.num_htlcs; i++) {
peer->htlcs[i] = tal_dup(peer->htlcs, struct htlc,
&peer->db.htlcs[i]);
if (verbose)
printf("%s: HTLC %u %s\n",
peer->name, peer->htlcs[i]->id,
htlc_statename(peer->htlcs[i]->state));
}
*peer->local = peer->db.local;
peer->local->prev = NULL;
*peer->remote = peer->db.remote;
if (peer->remote->number != 0) {
peer->remote->prev = tal(peer, struct commit_info);
*peer->remote->prev = peer->db.remote_prev;
peer->remote->prev->prev = NULL;
} else
peer->remote->prev = NULL;
/* Tell peer where we've received. */
write_out(peer->outfd, "!", 1);
write_out(peer->outfd, &peer->db.last_recv, sizeof(peer->db.last_recv));
/* Find out where peer is up to. */
read_peer(peer, "!", "restore");
read_in(peer->infd, &sent, sizeof(sent));
if (verbose)
printf("%s: peer is up to %zu/%zu: last commit at %zu\n",
peer->name, sent, peer->db.last_sent,peer->remote->order);
if (sent > peer->db.last_sent)
errx(1, "%s: peer said up to %zu, but we only sent %zu",
peer->name, sent, peer->db.last_sent);
/* All up to date? Nothing to do. */
if (sent == peer->db.last_sent)
return;
/* Since we wait for revocation replies, only one of the missing
* could be our update; the rest must be revocations. */
num_revokes = peer->db.last_sent - sent - (sent < peer->remote->order);
if (num_revokes > peer->local->number)
errx(1, "%s: can't rexmit %zu revoke txs at %u",
peer->name, num_revokes, peer->local->number);
revoke_idx = peer->local->number - num_revokes;
/* If we sent a revocation before the commit. */
if (sent + 1 < peer->remote->order) {
xmit_revoke(peer, revoke_idx++);
num_revokes--;
sent++;
}
/* If they didn't get the last commit, re-send all. */
if (sent + 1 == peer->remote->order) {
struct commit_tx tx;
struct signature sig;
resend_updates(peer);
tx = make_commit_tx(peer->htlcs, REMOTE_);
sig = commit_sig(&tx);
xmit_commit(peer, sig);
sent++;
}
/* Now send any revocations after the commit. */
if (sent + 1 == peer->db.last_sent) {
num_revokes--;
xmit_revoke(peer, revoke_idx++);
sent++;
}
if (sent != peer->db.last_sent)
errx(1, "%s: could not catch up %zu to %zu",
peer->name, sent, peer->db.last_sent);
assert(num_revokes == 0);
}
static void do_cmd(struct peer *peer)
{
char cmd[80];
int i;
unsigned int htlc;
struct commit_info *ci;
i = read(peer->cmdfd, cmd, sizeof(cmd)-1);
if (i <= 0)
err(1, "%s: reading command", peer->name);
if (cmd[i-1] != '\0')
errx(1, "%s: Unterminated command", peer->name);
if (i == 1) {
fflush(stdout);
exit(0);
}
peer->info = tal_strdup(peer, "");
if (sscanf(cmd, "offer %u", &htlc) == 1)
send_offer(peer, htlc);
else if (sscanf(cmd, "remove %u", &htlc) == 1)
send_remove(peer, htlc);
else if (streq(cmd, "feechange"))
send_feechange(peer);
else if (streq(cmd, "commit"))
send_commit(peer);
else if (streq(cmd, "recvrevoke")) {
u32 number;
read_peer(peer, "R", cmd);
read_in(peer->infd, &number, sizeof(number));
receive_revoke(peer, number);
} else if (streq(cmd, "recvoffer")) {
read_peer(peer, "+", cmd);
read_in(peer->infd, &htlc, sizeof(htlc));
receive_offer(peer, htlc);
} else if (streq(cmd, "recvremove")) {
read_peer(peer, "-", cmd);
read_in(peer->infd, &htlc, sizeof(htlc));
receive_remove(peer, htlc);
} else if (streq(cmd, "recvfeechange")) {
read_peer(peer, "F", cmd);
receive_feechange(peer);
} else if (streq(cmd, "recvcommit")) {
struct signature sig;
read_peer(peer, "C", cmd);
read_in(peer->infd, &sig, sizeof(sig));
receive_commit(peer, &sig);
} else if (streq(cmd, "save")) {
write_all(peer->cmddonefd, &peer->db, sizeof(peer->db));
return;
} else if (streq(cmd, "restore")) {
write_all(peer->cmddonefd, "", 1);
/* Ack, then read in blob */
if (!read_all(peer->cmdfd, &peer->db, sizeof(peer->db))) {
errx(1, "Read failed for command \"restore\"");
}
restore_state(peer);
} else if (streq(cmd, "checksync")) {
struct commit_tx ours, theirs;
ours = make_commit_tx(peer->htlcs, LOCAL_);
theirs = make_commit_tx(peer->htlcs, REMOTE_);
write_all(peer->cmddonefd, &ours, sizeof(ours));
write_all(peer->cmddonefd, &theirs, sizeof(theirs));
return;
} else if (streq(cmd, "dump")) {
dump_peer(peer, false);
} else if (streq(cmd, "dumpall")) {
dump_peer(peer, true);
} else