core-lightning/lightningd/options.c

#include <bitcoin/chainparams.h>
#include <ccan/array_size/array_size.h>
#include <ccan/err/err.h>
#include <ccan/mem/mem.h>
#include <ccan/opt/opt.h>
#include <ccan/opt/private.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/grab_file/grab_file.h>
#include <ccan/tal/path/path.h>
#include <ccan/tal/str/str.h>
#include <common/configdir.h>
#include <common/memleak.h>
#include <common/version.h>
#include <common/wireaddr.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <lightningd/bitcoind.h>
#include <lightningd/chaintopology.h>
#include <lightningd/json.h>
#include <lightningd/json_escaped.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/jsonrpc_errors.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/options.h>
#include <lightningd/param.h>
#include <lightningd/subd.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <wire/wire.h>

bool deprecated_apis = true;

/* Tal wrappers for opt. */
static void *opt_allocfn(size_t size)
{
	return tal_arr_label(NULL, char, size, TAL_LABEL("opt_allocfn", ""));
}

static void *tal_reallocfn(void *ptr, size_t size)
{
	if (!ptr) {
		/* realloc(NULL) call is to allocate opt_table */
		static bool opt_table_alloced = false;
		if (!opt_table_alloced) {
			opt_table_alloced = true;
			return notleak(opt_allocfn(size));
		}
		return opt_allocfn(size);
	}
	tal_resize_(&ptr, 1, size, false);
	return ptr;
}

static void tal_freefn(void *ptr)
{
	tal_free(ptr);
}

/* FIXME: Put into ccan/time. */
#define TIME_FROM_SEC(sec) { { .tv_nsec = 0, .tv_sec = sec } }
#define TIME_FROM_MSEC(msec) \
	{ { .tv_nsec = ((msec) % 1000) * 1000000, .tv_sec = (msec) / 1000 } }

static char *opt_set_u64(const char *arg, u64 *u)
{
	char *endp;
	unsigned long long l;

	assert(arg != NULL);

	/* This is how the manpage says to do it.  Yech. */
	errno = 0;
	l = strtoull(arg, &endp, 0);
	if (*endp || !arg[0])
		return tal_fmt(NULL, "'%s' is not a number", arg);
	*u = l;
	if (errno || *u != l)
		return tal_fmt(NULL, "'%s' is out of range", arg);
	return NULL;
}
static char *opt_set_u32(const char *arg, u32 *u)
{
	char *endp;
	unsigned long l;

	assert(arg != NULL);

	/* This is how the manpage says to do it.  Yech. */
	errno = 0;
	l = strtoul(arg, &endp, 0);
	if (*endp || !arg[0])
		return tal_fmt(NULL, "'%s' is not a number", arg);
	*u = l;
	if (errno || *u != l)
		return tal_fmt(NULL, "'%s' is out of range", arg);
	return NULL;
}

static char *opt_set_s32(const char *arg, s32 *u)
{
	char *endp;
	long l;

	assert(arg != NULL);

	/* This is how the manpage says to do it.  Yech. */
	errno = 0;
	l = strtol(arg, &endp, 0);
	if (*endp || !arg[0])
		return tal_fmt(NULL, "'%s' is not a number", arg);
	*u = l;
	if (errno || *u != l)
		return tal_fmt(NULL, "'%s' is out of range", arg);
	return NULL;
}

static char *opt_add_addr_withtype(const char *arg,
				   struct lightningd *ld,
				   enum addr_listen_announce ala,
				   bool wildcard_ok)
{
	char const *err_msg;

	assert(arg != NULL);

	*tal_arr_expand(&ld->proposed_listen_announce) = ala;
	if (!parse_wireaddr_internal(arg, tal_arr_expand(&ld->proposed_wireaddr),
				     ld->portnum,
				     wildcard_ok, !ld->use_proxy_always, false,
				     &err_msg)) {
		return tal_fmt(NULL, "Unable to parse address '%s': %s", arg, err_msg);
	}

	return NULL;

}

static char *opt_add_addr(const char *arg, struct lightningd *ld)
{
	return opt_add_addr_withtype(arg, ld, ADDR_LISTEN_AND_ANNOUNCE, true);
}

static char *opt_add_bind_addr(const char *arg, struct lightningd *ld)
{
	return opt_add_addr_withtype(arg, ld, ADDR_LISTEN, true);
}

static char *opt_add_announce_addr(const char *arg, struct lightningd *ld)
{
	const struct wireaddr *wn;
	size_t n = tal_count(ld->proposed_wireaddr);
	char *err = opt_add_addr_withtype(arg, ld, ADDR_ANNOUNCE, false);
	if (err)
		return err;

	/* Can't announce anything that's not a normal wireaddr. */
	if (ld->proposed_wireaddr[n].itype != ADDR_INTERNAL_WIREADDR)
		return tal_fmt(NULL, "address '%s' is not announcable",
			       arg);

	/* gossipd will refuse to announce the second one, sure, but it's
	 * better to check and fail now if they've explicitly asked for it. */
	wn = &ld->proposed_wireaddr[n].u.wireaddr;
	for (size_t i = 0; i < n; i++) {
		const struct wireaddr *wi;

		if (ld->proposed_listen_announce[i] != ADDR_ANNOUNCE)
			continue;
		assert(ld->proposed_wireaddr[i].itype == ADDR_INTERNAL_WIREADDR);
		wi = &ld->proposed_wireaddr[i].u.wireaddr;

		if (wn->type != wi->type)
			continue;
		return tal_fmt(NULL, "Cannot announce address %s;"
			       " already have %s which is the same type",
			       type_to_string(tmpctx, struct wireaddr, wn),
			       type_to_string(tmpctx, struct wireaddr, wi));
	}
	return NULL;
}

static void opt_show_u64(char buf[OPT_SHOW_LEN], const u64 *u)
{
	snprintf(buf, OPT_SHOW_LEN, "%"PRIu64, *u);
}
static void opt_show_u32(char buf[OPT_SHOW_LEN], const u32 *u)
{
	snprintf(buf, OPT_SHOW_LEN, "%"PRIu32, *u);
}

static void opt_show_s32(char buf[OPT_SHOW_LEN], const s32 *u)
{
	snprintf(buf, OPT_SHOW_LEN, "%"PRIi32, *u);
}

static char *opt_set_network(const char *arg, struct lightningd *ld)
{
	assert(arg != NULL);

	ld->topology->bitcoind->chainparams = chainparams_for_network(arg);
	if (!ld->topology->bitcoind->chainparams)
		return tal_fmt(NULL, "Unknown network name '%s'", arg);
	return NULL;
}

static char *opt_set_testnet(struct lightningd *ld)
{
	return opt_set_network("testnet", ld);
}

static char *opt_set_mainnet(struct lightningd *ld)
{
	return opt_set_network("bitcoin", ld);
}

static void opt_show_network(char buf[OPT_SHOW_LEN],
			     const struct lightningd *ld)
{
	snprintf(buf, OPT_SHOW_LEN, "%s", get_chainparams(ld)->network_name);
}

static char *opt_set_rgb(const char *arg, struct lightningd *ld)
{
	assert(arg != NULL);

	ld->rgb = tal_free(ld->rgb);
	/* BOLT #7:
	 *
	 *    - Note: the first byte of `rgb_color` is the red value, the second
	 *      byte is the green value, and the last byte is the blue value.
	 */
	ld->rgb = tal_hexdata(ld, arg, strlen(arg));
	if (!ld->rgb || tal_count(ld->rgb) != 3)
		return tal_fmt(NULL, "rgb '%s' is not six hex digits", arg);
	return NULL;
}

static char *opt_set_alias(const char *arg, struct lightningd *ld)
{
	assert(arg != NULL);

	ld->alias = tal_free(ld->alias);
	/* BOLT #7:
	 *
	 *    * [`32`:`alias`]
	 *...
	 *  - MUST set `alias` to a valid UTF-8 string, with any
	 *   `alias` trailing-bytes equal to 0.
	 */
	if (strlen(arg) > 32)
		return tal_fmt(NULL, "Alias '%s' is over 32 characters", arg);
	ld->alias = tal_arrz(ld, u8, 33);
	strncpy((char*)ld->alias, arg, 32);
	return NULL;
}

static char *opt_set_offline(struct lightningd *ld)
{
	ld->reconnect = false;
	ld->listen = false;

	return NULL;
}

static char *opt_add_proxy_addr(const char *arg, struct lightningd *ld)
{
	bool needed_dns = false;
	tal_free(ld->proxyaddr);

	/* We use a tal_arr here, so we can marshal it to gossipd */
	ld->proxyaddr = tal_arr(ld, struct wireaddr, 1);

	if (!parse_wireaddr(arg, ld->proxyaddr, 9050,
			    ld->use_proxy_always ? &needed_dns : NULL,
			    NULL)) {
		return tal_fmt(NULL, "Unable to parse Tor proxy address '%s' %s",
			       arg, needed_dns ? " (needed dns)" : "");
	}
	return NULL;
}

static void config_register_opts(struct lightningd *ld)
{
	opt_register_early_arg("--conf=<file>", opt_set_talstr, NULL,
		&ld->config_filename,
		"Specify configuration file. Relative paths will be prefixed by lightning-dir location. (default: config)");
	opt_register_noarg("--daemon", opt_set_bool, &ld->daemon,
			 "Run in the background, suppress stdout/stderr");
	opt_register_arg("--ignore-fee-limits", opt_set_bool_arg, opt_show_bool,
			 &ld->config.ignore_fee_limits,
			 "(DANGEROUS) allow peer to set any feerate");
	opt_register_arg("--watchtime-blocks", opt_set_u32, opt_show_u32,
			 &ld->config.locktime_blocks,
			 "Blocks before peer can unilaterally spend funds");
	opt_register_arg("--max-locktime-blocks", opt_set_u32, opt_show_u32,
			 &ld->config.locktime_max,
			 "Maximum blocks funds may be locked for");
	opt_register_arg("--funding-confirms", opt_set_u32, opt_show_u32,
			 &ld->config.anchor_confirms,
			 "Confirmations required for funding transaction");
	opt_register_arg("--commit-fee-min=<percent>", opt_set_u32, opt_show_u32,
			 &ld->config.commitment_fee_min_percent,
			 "Minimum percentage of fee to accept for commitment");
	opt_register_arg("--commit-fee-max=<percent>", opt_set_u32, opt_show_u32,
			 &ld->config.commitment_fee_max_percent,
			 "Maximum percentage of fee to accept for commitment (0 for unlimited)");
	opt_register_arg("--commit-fee=<percent>", opt_set_u32, opt_show_u32,
			 &ld->config.commitment_fee_percent,
			 "Percentage of fee to request for their commitment");
	opt_register_arg("--cltv-delta", opt_set_u32, opt_show_u32,
			 &ld->config.cltv_expiry_delta,
			 "Number of blocks for cltv_expiry_delta");
	opt_register_arg("--cltv-final", opt_set_u32, opt_show_u32,
			 &ld->config.cltv_final,
			 "Number of blocks for final cltv_expiry");
	opt_register_arg("--commit-time=<millseconds>",
			 opt_set_u32, opt_show_u32,
			 &ld->config.commit_time_ms,
			 "Time after changes before sending out COMMIT");
	opt_register_arg("--fee-base", opt_set_u32, opt_show_u32,
			 &ld->config.fee_base,
			 "Millisatoshi minimum to charge for HTLC");
	opt_register_arg("--rescan", opt_set_s32, opt_show_s32,
			 &ld->config.rescan,
			 "Number of blocks to rescan from the current head, or "
			 "absolute blockheight if negative");
	opt_register_arg("--fee-per-satoshi", opt_set_s32, opt_show_s32,
			 &ld->config.fee_per_satoshi,
			 "Microsatoshi fee for every satoshi in HTLC");
	opt_register_arg("--addr", opt_add_addr, NULL,
			 ld,
			 "Set an IP address (v4 or v6) to listen on and announce to the network for incoming connections");
	opt_register_arg("--bind-addr", opt_add_bind_addr, NULL,
			 ld,
			 "Set an IP address (v4 or v6) to listen on, but not announce");
	opt_register_arg("--announce-addr", opt_add_announce_addr, NULL,
			 ld,
			 "Set an IP address (v4 or v6) or .onion v2/v3 to announce, but not listen on");

	opt_register_noarg("--offline", opt_set_offline, ld,
			   "Start in offline-mode (do not automatically reconnect and do not accept incoming connections)");
	opt_register_arg("--autolisten", opt_set_bool_arg, opt_show_bool,
			 &ld->autolisten,
			 "If true, listen on default port and announce if it seems to be a public interface");

	opt_register_early_arg("--network", opt_set_network, opt_show_network,
			       ld,
			       "Select the network parameters (bitcoin, testnet,"
			       " regtest, litecoin or litecoin-testnet)");
	opt_register_early_noarg("--testnet", opt_set_testnet, ld,
				 "Alias for --network=testnet");
	opt_register_early_noarg("--mainnet", opt_set_mainnet, ld,
				 "Alias for --network=bitcoin");
	opt_register_early_arg("--allow-deprecated-apis",
			       opt_set_bool_arg, opt_show_bool,
			       &deprecated_apis,
			       "Enable deprecated options, JSONRPC commands, fields, etc.");
	opt_register_arg("--autocleaninvoice-cycle",
			 opt_set_u64, opt_show_u64,
			 &ld->ini_autocleaninvoice_cycle,
			 "Perform cleanup of expired invoices every given seconds, or do not autoclean if 0");
	opt_register_arg("--autocleaninvoice-expired-by",
			 opt_set_u64, opt_show_u64,
			 &ld->ini_autocleaninvoice_cycle,
			 "If expired invoice autoclean enabled, invoices that have expired for at least this given seconds are cleaned");
	opt_register_arg("--proxy", opt_add_proxy_addr, NULL,
			ld,"Set a socks v5 proxy IP address and port");
	opt_register_arg("--tor-service-password", opt_set_talstr, NULL,
			 &ld->tor_service_password,
			 "Set a Tor hidden service password");

	/* Early, as it suppresses DNS lookups from cmdline too. */
	opt_register_early_arg("--always-use-proxy",
			       opt_set_bool_arg, opt_show_bool,
			       &ld->use_proxy_always, "Use the proxy always");

	opt_register_noarg("--disable-dns", opt_set_invbool, &ld->config.use_dns,
			   "Disable DNS lookups of peers");

#if DEVELOPER
	opt_register_arg("--dev-max-funding-unconfirmed-blocks",
			 opt_set_u32, opt_show_u32,
			 &ld->max_funding_unconfirmed,
			 "Maximum number of blocks we wait for a channel "
			 "funding transaction to confirm, if we are the "
			 "fundee.");
#endif
}

#if DEVELOPER
static void dev_register_opts(struct lightningd *ld)
{
	opt_register_noarg("--dev-no-reconnect", opt_set_invbool,
			   &ld->reconnect,
			   "Disable automatic reconnect attempts");
	opt_register_noarg("--dev-fail-on-subdaemon-fail", opt_set_bool,
			   &ld->dev_subdaemon_fail, opt_hidden);
	opt_register_arg("--dev-debugger=<subdaemon>", opt_subd_debug, NULL,
			 ld, "Invoke gdb at start of <subdaemon>");
	opt_register_arg("--dev-broadcast-interval=<ms>", opt_set_uintval,
			 opt_show_uintval, &ld->config.broadcast_interval_msec,
			 "Time between gossip broadcasts in milliseconds");
	opt_register_arg("--dev-disconnect=<filename>", opt_subd_dev_disconnect,
			 NULL, ld, "File containing disconnection points");
	opt_register_noarg("--dev-allow-localhost", opt_set_bool,
			   &ld->dev_allow_localhost,
			   "Announce and allow announcments for localhost address");
	opt_register_arg("--dev-bitcoind-poll", opt_set_u32, opt_show_u32,
			 &ld->topology->poll_seconds,
			 "Time between polling for new transactions");
	opt_register_arg("--dev-max-fee-multiplier", opt_set_u32, opt_show_u32,
			 &ld->config.max_fee_multiplier,
			 "Allow the fee proposed by the remote end to be up to "
			 "multiplier times higher than our own. Small values "
			 "will cause channels to be closed more often due to "
			 "fee fluctuations, large values may result in large "
			 "fees.");

	opt_register_arg(
	    "--dev-channel-update-interval=<s>", opt_set_u32, opt_show_u32,
	    &ld->config.channel_update_interval,
	    "Time in seconds between channel updates for our own channels.");
}
#endif

static const struct config testnet_config = {
	/* 6 blocks to catch cheating attempts. */
	.locktime_blocks = 6,

	/* They can have up to 14 days, maximumu value that lnd will ask for by default. */
	/* FIXME Convince lnd to use more reasonable defaults... */
	.locktime_max = 14 * 24 * 6,

	/* We're fairly trusting, under normal circumstances. */
	.anchor_confirms = 1,

	/* Testnet fees are crazy, allow infinite feerange. */
	.commitment_fee_min_percent = 0,
	.commitment_fee_max_percent = 0,

	/* We offer to pay 5 times 2-block fee */
	.commitment_fee_percent = 500,

	/* Be aggressive on testnet. */
	.cltv_expiry_delta = 6,
	.cltv_final = 10,

	/* Send commit 10msec after receiving; almost immediately. */
	.commit_time_ms = 10,

	/* Allow dust payments */
	.fee_base = 1,
	/* Take 0.001% */
	.fee_per_satoshi = 10,

	/* BOLT #7:
	 *
	 *   - SHOULD flush outgoing gossip messages once every 60
	 *     seconds, independently of the arrival times of the messages.
	 */
	.broadcast_interval_msec = 60000,

	/* Send a keepalive update at least every week, prune every twice that */
	.channel_update_interval = 1209600/2,

	/* Testnet sucks */
	.ignore_fee_limits = true,

	/* Rescan 5 hours of blocks on testnet, it's reorg happy */
	.rescan = 30,

	/* Fees may be in the range our_fee - 10*our_fee */
	.max_fee_multiplier = 10,

	.use_dns = true,
};

/* aka. "Dude, where's my coins?" */
static const struct config mainnet_config = {
	/* ~one day to catch cheating attempts. */
	.locktime_blocks = 6 * 24,

	/* They can have up to 14 days, maximumu value that lnd will ask for by default. */
	/* FIXME Convince lnd to use more reasonable defaults... */
	.locktime_max = 14 * 24 * 6,

	/* We're fairly trusting, under normal circumstances. */
	.anchor_confirms = 3,

	/* Insist between 2 and 20 times the 2-block fee. */
	.commitment_fee_min_percent = 200,
	.commitment_fee_max_percent = 2000,

	/* We offer to pay 5 times 2-block fee */
	.commitment_fee_percent = 500,

	/* BOLT #2:
	 *
	 * 1. the `cltv_expiry_delta` for channels, `3R+2G+2S`: if in doubt, a
	 *   `cltv_expiry_delta` of 12 is reasonable (R=2, G=1, S=2)
	 */
	/* R = 2, G = 1, S = 3 */
	.cltv_expiry_delta = 14,

	/* BOLT #2:
	 *
	 * 4. the minimum `cltv_expiry` accepted for terminal payments: the
	 *    worst case for the terminal node C is `2R+G+S` blocks */
	.cltv_final = 10,

	/* Send commit 10msec after receiving; almost immediately. */
	.commit_time_ms = 10,

	/* Discourage dust payments */
	.fee_base = 1000,
	/* Take 0.001% */
	.fee_per_satoshi = 10,

	/* BOLT #7:
	 *
	 *   - SHOULD flush outgoing gossip messages once every 60
	 *     seconds, independently of the arrival times of the messages.
	 */
	.broadcast_interval_msec = 60000,

	/* Send a keepalive update at least every week, prune every twice that */
	.channel_update_interval = 1209600/2,

	/* Mainnet should have more stable fees */
	.ignore_fee_limits = false,

	/* Rescan 2.5 hours of blocks on startup, it's not so reorg happy */
	.rescan = 15,

	/* Fees may be in the range our_fee - 10*our_fee */
	.max_fee_multiplier = 10,

	.use_dns = true,
};

static void check_config(struct lightningd *ld)
{
	/* We do this by ensuring it's less than the minimum we would accept. */
	if (ld->config.commitment_fee_max_percent != 0
	    && ld->config.commitment_fee_max_percent
	    < ld->config.commitment_fee_min_percent)
		fatal("Commitment fee invalid min-max %u-%u",
		      ld->config.commitment_fee_min_percent,
		      ld->config.commitment_fee_max_percent);

	if (ld->config.anchor_confirms == 0)
		fatal("anchor-confirms must be greater than zero");

	if (ld->use_proxy_always && !ld->proxyaddr)
		fatal("--always-use-proxy needs --proxy");
}

static void setup_default_config(struct lightningd *ld)
{
	if (get_chainparams(ld)->testnet)
		ld->config = testnet_config;
	else
		ld->config = mainnet_config;

	/* Set default PID file name to be per-network */
	tal_free(ld->pidfile);
	ld->pidfile = tal_fmt(ld, "lightningd-%s.pid", get_chainparams(ld)->network_name);
}


/* FIXME: make this nicer! */
static int config_parse_line_number = 0;

static void config_log_stderr_exit(const char *fmt, ...)
{
	char *msg;
	va_list ap;

	va_start(ap, fmt);

	/* This is the format we expect:*/
	if (streq(fmt, "%s: %.*s: %s")) {
		const char *argv0 = va_arg(ap, const char *);
		unsigned int len = va_arg(ap, unsigned int);
		const char *arg = va_arg(ap, const char *);
		const char *problem = va_arg(ap, const char *);

		assert(argv0 != NULL);
		assert(arg != NULL);
		assert(problem != NULL);
		/*mangle it to remove '--' and add the line number.*/
		msg = tal_fmt(NULL, "%s line %d: %.*s: %s",
			      argv0, config_parse_line_number, len-2, arg+2, problem);
	} else {
		msg = tal_vfmt(NULL, fmt, ap);
	}
	va_end(ap);

	fatal("%s", msg);
}

/* We turn the config file into cmdline arguments. */
static void opt_parse_from_config(struct lightningd *ld)
{
	char *contents, **lines;
	char **all_args; /*For each line: either argument string or NULL*/
	char *argv[3];
	int i, argc;
	char *filename;

	if (ld->config_filename != NULL)
		filename = ld->config_filename;
	else
		filename = path_join(tmpctx, ld->config_dir, "config");

	contents = grab_file(ld, filename);

	/* The default config doesn't have to exist, but if the config was
	 * specified on the command line it has to exist. */
	if (!contents) {
		if ((errno != ENOENT) || (ld->config_filename != NULL))
			fatal("Opening and reading %s: %s",
			      filename, strerror(errno));
		/* Now we can set up defaults, since no config file. */
		setup_default_config(ld);
		return;
	}

	lines = tal_strsplit(contents, contents, "\r\n", STR_NO_EMPTY);

	/* We have to keep all_args around, since opt will point into it */
	all_args = tal_arr(ld, char *, tal_count(lines) - 1);

	for (i = 0; i < tal_count(lines) - 1; i++) {
		if (strstarts(lines[i], "#")) {
			all_args[i] = NULL;
		}
		else {
			/* Only valid forms are "foo" and "foo=bar" */
			all_args[i] = tal_fmt(all_args, "--%s", lines[i]);
		}
	}

	/*
	For each line we construct a fake argc,argv commandline.
	argv[1] is the only element that changes between iterations.
	*/
	argc = 2;
	argv[0] = "lightning config file";
	argv[argc] = NULL;

	for (i = 0; i < tal_count(all_args); i++) {
		if(all_args[i] != NULL) {
			config_parse_line_number = i + 1;
			argv[1] = all_args[i];
			opt_early_parse(argc, argv, config_log_stderr_exit);
		}
	}

	/* Now we can set up defaults, depending on whether testnet or not */
	setup_default_config(ld);

	for (i = 0; i < tal_count(all_args); i++) {
		if(all_args[i] != NULL) {
			config_parse_line_number = i + 1;
			argv[1] = all_args[i];
			opt_parse(&argc, argv, config_log_stderr_exit);
			argc = 2; /* opt_parse might have changed it  */
		}
	}

	tal_free(contents);
}

static char *test_subdaemons_and_exit(struct lightningd *ld)
{
	test_subdaemons(ld);
	exit(0);
	return NULL;
}

static char *opt_lightningd_usage(struct lightningd *ld)
{
	/* Reload config so that --help has the correct network defaults
	 * to display before it exits */
	setup_default_config(ld);
	char *extra = tal_fmt(NULL, "\nA bitcoin lightning daemon (default "
			"values shown for network: %s).",
	                get_chainparams(ld)->network_name);
	opt_usage_and_exit(extra);
	tal_free(extra);
	return NULL;
}

void register_opts(struct lightningd *ld)
{
	opt_set_alloc(opt_allocfn, tal_reallocfn, tal_freefn);

	opt_register_early_noarg("--help|-h", opt_lightningd_usage, ld,
				 "Print this message.");
	opt_register_early_noarg("--test-daemons-only",
				 test_subdaemons_and_exit,
				 ld, opt_hidden);

	opt_register_arg("--bitcoin-datadir", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->datadir,
			 "-datadir arg for bitcoin-cli");
	opt_register_arg("--rgb", opt_set_rgb, NULL, ld,
			 "RRGGBB hex color for node");
	opt_register_arg("--alias", opt_set_alias, NULL, ld,
			 "Up to 32-byte alias for node");

	opt_register_arg("--bitcoin-cli", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->cli,
			 "bitcoin-cli pathname");
	opt_register_arg("--bitcoin-rpcuser", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->rpcuser,
			 "bitcoind RPC username");
	opt_register_arg("--bitcoin-rpcpassword", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->rpcpass,
			 "bitcoind RPC password");
	opt_register_arg("--bitcoin-rpcconnect", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->rpcconnect,
			 "bitcoind RPC host to connect to");
	opt_register_arg("--bitcoin-rpcport", opt_set_talstr, NULL,
			 &ld->topology->bitcoind->rpcport,
			 "bitcoind RPC port");
	opt_register_arg("--pid-file=<file>", opt_set_talstr, opt_show_charp,
			 &ld->pidfile,
			 "Specify pid file");

	opt_register_logging(ld);
	opt_register_version();

	configdir_register_opts(ld, &ld->config_dir, &ld->rpc_filename);
	config_register_opts(ld);
#if DEVELOPER
	dev_register_opts(ld);
#endif
}

/* Names stolen from https://github.com/ternus/nsaproductgenerator/blob/master/nsa.js */
static const char *codename_adjective[]
= { "LOUD", "RED", "BLUE", "GREEN", "YELLOW", "IRATE", "ANGRY", "PEEVED",
    "HAPPY", "SLIMY", "SLEEPY", "JUNIOR", "SLICKER", "UNITED", "SOMBER",
    "BIZARRE", "ODD", "WEIRD", "WRONG", "LATENT", "CHILLY", "STRANGE", "LOUD",
    "SILENT", "HOPPING", "ORANGE", "VIOLET", "VIOLENT", "LIGHTNING" };

static const char *codename_noun[]
= { "WHISPER", "FELONY", "MOON", "SUCKER", "PENGUIN", "WAFFLE", "MAESTRO",
    "NIGHT", "TRINITY", "DEITY", "MONKEY", "ARK", "SQUIRREL", "IRON", "BOUNCE",
    "FARM", "CHEF", "TROUGH", "NET", "TRAWL", "GLEE", "WATER", "SPORK", "PLOW",
    "FEED", "SOUFFLE", "ROUTE", "BAGEL", "MONTANA", "ANALYST", "AUTO", "WATCH",
    "PHOTO", "YARD", "SOURCE", "MONKEY", "SEAGULL", "TOLL", "SPAWN", "GOPHER",
    "CHIPMUNK", "SET", "CALENDAR", "ARTIST", "CHASER", "SCAN", "TOTE", "BEAM",
    "ENTOURAGE", "GENESIS", "WALK", "SPATULA", "RAGE", "FIRE", "MASTER" };

void setup_color_and_alias(struct lightningd *ld)
{
	u8 der[PUBKEY_DER_LEN];
	pubkey_to_der(der, &ld->id);

	if (!ld->rgb)
		/* You can't get much red by default */
		ld->rgb = tal_dup_arr(ld, u8, der, 3, 0);

	if (!ld->alias) {
		u64 adjective, noun;
		char *name;

		memcpy(&adjective, der+3, sizeof(adjective));
		memcpy(&noun, der+3+sizeof(adjective), sizeof(noun));
		noun %= ARRAY_SIZE(codename_noun);
		adjective %= ARRAY_SIZE(codename_adjective);

		/* Only use 32 characters */
		name = tal_fmt(ld, "%s%s",
			       codename_adjective[adjective],
			       codename_noun[noun]);
#if DEVELOPER
		assert(strlen(name) < 32);
		int taillen = 31 - strlen(name);
		if (taillen > strlen(version()))
			taillen = strlen(version());
		/* Fit as much of end of version() as possible */
		tal_append_fmt(&name, "-%s",
			       version() + strlen(version()) - taillen);
#endif
		assert(strlen(name) <= 32);
		ld->alias = tal_arrz(ld, u8, 33);
		strcpy((char*)ld->alias, name);
		tal_free(name);
	}
}

void handle_opts(struct lightningd *ld, int argc, char *argv[])
{
	/* Load defaults. The actual values loaded here will be overwritten
	 * later by opt_parse_from_config. */
	setup_default_config(ld);

	/* Get any configdir/testnet options first. */
	opt_early_parse(argc, argv, opt_log_stderr_exit);

	/* Now look for config file */
	opt_parse_from_config(ld);

	/* Move to config dir, to save ourselves the hassle of path manip. */
	if (chdir(ld->config_dir) != 0) {
		log_unusual(ld->log, "Creating configuration directory %s",
			    ld->config_dir);
		if (mkdir(ld->config_dir, 0700) != 0)
			fatal("Could not make directory %s: %s",
			      ld->config_dir, strerror(errno));
		if (chdir(ld->config_dir) != 0)
			fatal("Could not change directory %s: %s",
			      ld->config_dir, strerror(errno));
	}

	opt_parse(&argc, argv, opt_log_stderr_exit);
	if (argc != 1)
		errx(1, "no arguments accepted");

	/* We keep a separate variable rather than overriding use_proxy_always,
	 * so listconfigs shows the correct thing. */
	if (tal_count(ld->proposed_wireaddr) != 0
	    && all_tor_addresses(ld->proposed_wireaddr)) {
		ld->pure_tor_setup = true;
		if (!ld->proxyaddr)
			log_info(ld->log, "Pure Tor setup with no --proxy:"
				 " you won't be able to make connections out");
	}
	check_config(ld);
}

/* FIXME: This is a hack!  Expose somehow in ccan/opt.*/
/* Returns string after first '-'. */
static const char *first_name(const char *names, unsigned *len)
{
	*len = strcspn(names + 1, "|= ");
	return names + 1;
}

static const char *next_name(const char *names, unsigned *len)
{
	names += *len;
	if (names[0] == ' ' || names[0] == '=' || names[0] == '\0')
		return NULL;
	return first_name(names + 1, len);
}

static void json_add_opt_addrs(struct json_stream *response,
			       const char *name0,
			       const struct wireaddr_internal *wireaddrs,
			       const enum addr_listen_announce *listen_announce,
			       enum addr_listen_announce ala)
{
	for (size_t i = 0; i < tal_count(wireaddrs); i++) {
		if (listen_announce[i] != ala)
			continue;
		json_add_string(response,
				name0,
				fmt_wireaddr_internal(name0, wireaddrs+i));
	}
}

static void add_config(struct lightningd *ld,
		       struct json_stream *response,
		       const struct opt_table *opt,
		       const char *name, size_t len)
{
	char *name0 = tal_strndup(response, name, len);
	const char *answer = NULL;

	if (opt->type & OPT_NOARG) {
		if (opt->cb == (void *)opt_usage_and_exit
		    || opt->cb == (void *)version_and_exit
		    /* These two show up as --network= */
		    || opt->cb == (void *)opt_set_testnet
		    || opt->cb == (void *)opt_set_mainnet
		    || opt->cb == (void *)opt_lightningd_usage
		    || opt->cb == (void *)test_subdaemons_and_exit) {
			/* These are not important */
		} else if (opt->cb == (void *)opt_set_bool) {
			const bool *b = opt->u.carg;
			answer = tal_fmt(name0, "%s", *b ? "true" : "false");
		} else if (opt->cb == (void *)opt_set_invbool) {
			const bool *b = opt->u.carg;
			answer = tal_fmt(name0, "%s", !*b ? "true" : "false");
		} else if (opt->cb == (void *)opt_set_offline) {
			answer = tal_fmt(name0, "%s",
					 (!ld->reconnect && !ld->listen)
					 ? "true" : "false");
		} else {
			/* Insert more decodes here! */
			assert(!"A noarg option was added but was not handled");
		}
	} else if (opt->type & OPT_HASARG) {
		if (opt->desc == opt_hidden) {
			/* Ignore hidden options (deprecated) */
		} else if (opt->show) {
			char *buf = tal_arr(name0, char, OPT_SHOW_LEN+1);
			opt->show(buf, opt->u.carg);

			if (streq(buf, "true") || streq(buf, "false")
			    || strspn(buf, "0123456789.") == strlen(buf)) {
				/* Let pure numbers and true/false through as
				 * literals. */
				json_add_literal(response, name0,
						 buf, strlen(buf));
				return;
			}

			/* opt_show_charp surrounds with "", strip them */
			if (strstarts(buf, "\"")) {
				buf[strlen(buf)-1] = '\0';
				answer = buf + 1;
			} else
				answer = buf;
		} else if (opt->cb_arg == (void *)opt_set_talstr
			   || opt->cb_arg == (void *)opt_set_charp) {
			const char *arg = *(char **)opt->u.carg;
			if (arg)
				answer = tal_fmt(name0, "%s", arg);
		} else if (opt->cb_arg == (void *)opt_set_rgb) {
			if (ld->rgb)
				answer = tal_hexstr(name0, ld->rgb, 3);
		} else if (opt->cb_arg == (void *)opt_set_alias) {
			answer = (const char *)ld->alias;
		} else if (opt->cb_arg == (void *)arg_log_to_file) {
			answer = ld->logfile;
		} else if (opt->cb_arg == (void *)opt_add_addr) {
			json_add_opt_addrs(response, name0,
					   ld->proposed_wireaddr,
					   ld->proposed_listen_announce,
					   ADDR_LISTEN_AND_ANNOUNCE);
			return;
		} else if (opt->cb_arg == (void *)opt_add_bind_addr) {
			json_add_opt_addrs(response, name0,
					   ld->proposed_wireaddr,
					   ld->proposed_listen_announce,
					   ADDR_LISTEN);
			return;
		} else if (opt->cb_arg == (void *)opt_add_announce_addr) {
			json_add_opt_addrs(response, name0,
					   ld->proposed_wireaddr,
					   ld->proposed_listen_announce,
					   ADDR_ANNOUNCE);
			return;
		} else if (opt->cb_arg == (void *)opt_add_proxy_addr) {
			if (ld->proxyaddr)
				answer = fmt_wireaddr(name0, ld->proxyaddr);
#if DEVELOPER
		} else if (strstarts(name, "dev-")) {
			/* Ignore dev settings */
#endif
		} else {
			/* Insert more decodes here! */
			abort();
		}
	}

	if (answer) {
		struct json_escaped *esc = json_escape(NULL, answer);
		json_add_escaped_string(response, name0, take(esc));
	}
	tal_free(name0);
}

static void json_listconfigs(struct command *cmd,
			     const char *buffer, const jsmntok_t *params)
{
	size_t i;
	struct json_stream *response = NULL;
	const jsmntok_t *configtok;

	if (!param(cmd, buffer, params,
		   p_opt("config", json_tok_tok, &configtok),
		   NULL))
		return;

	if (!configtok) {
		response = json_stream_success(cmd);
		json_object_start(response, NULL);
		json_add_string(response, "# version", version());
	}

	for (i = 0; i < opt_count; i++) {
		unsigned int len;
		const char *name;

		/* FIXME: Print out comment somehow? */
		if (opt_table[i].type == OPT_SUBTABLE)
			continue;

		for (name = first_name(opt_table[i].names, &len);
		     name;
		     name = next_name(name, &len)) {
			/* Skips over first -, so just need to look for one */
			if (name[0] != '-')
				continue;

			if (configtok
			    && !memeq(buffer + configtok->start,
				      configtok->end - configtok->start,
				      name + 1, len - 1))
				continue;

			if (!response) {
				response = json_stream_success(cmd);
				json_object_start(response, NULL);
			}
			add_config(cmd->ld, response, &opt_table[i],
				   name+1, len-1);
		}
	}

	if (configtok && !response) {
		command_fail(cmd, JSONRPC2_INVALID_PARAMS,
			     "Unknown config option '%.*s'",
			     configtok->end - configtok->start,
			     buffer + configtok->start);
		return;
	}
	json_object_end(response);
	command_success(cmd, response);
}

static const struct json_command listconfigs_command = {
	"listconfigs",
	json_listconfigs,
	"List all configuration options, or with [config], just that one.",

	.verbose = "listconfigs [config]\n"
	"Outputs an object, with each field a config options\n"
	"(Option names which start with # are comments)\n"
	"With [config], object only has that field"
};
AUTODATA(json_command, &listconfigs_command);