#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Tal wrappers for opt. */ static void *opt_allocfn(size_t size) { return tal_alloc_(NULL, size, false, false, TAL_LABEL("opt_allocfn", "")); } static void *tal_reallocfn(void *ptr, size_t size) { if (!ptr) 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; /* 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; /* 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_u16(const char *arg, u16 *u) { char *endp; unsigned long l; /* 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; /* 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; } /* FIXME: Rename ipaddr and hoist up */ bool parse_ipaddr(const char *arg, struct ipaddr *addr) { struct in6_addr v6; struct in_addr v4; /* FIXME: change arg to addr[:port] and use getaddrinfo? */ if (streq(arg, "localhost")) arg = "127.0.0.1"; else if (streq(arg, "ip6-localhost")) arg = "::1"; memset(&addr->addr, 0, sizeof(addr->addr)); if (inet_pton(AF_INET, arg, &v4) == 1) { addr->type = ADDR_TYPE_IPV4; addr->addrlen = 4; memcpy(&addr->addr, &v4, addr->addrlen); return true; } else if (inet_pton(AF_INET6, arg, &v6) == 1) { addr->type = ADDR_TYPE_IPV6; addr->addrlen = 16; memcpy(&addr->addr, &v6, addr->addrlen); return true; } return false; } static char *opt_set_ipaddr(const char *arg, struct ipaddr *addr) { if (parse_ipaddr(arg, addr)) return NULL; return tal_fmt(NULL, "Unable to parse IP address '%s'", arg); } 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 void opt_show_u16(char buf[OPT_SHOW_LEN], const u16 *u) { snprintf(buf, OPT_SHOW_LEN, "%u", *u); } static char *opt_set_network(const char *arg, struct lightningd *ld) { ld->topology->bitcoind->chainparams = chainparams_for_network(arg); if (!ld->topology->bitcoind->chainparams) return tal_fmt(NULL, "Unknown network name '%s'", arg); return NULL; } /* FIXME: Uncomment once legacy daemon has been removed */ /* static void opt_show_network(char buf[OPT_SHOW_LEN], const struct lightningd *ld) { snprintf(buf, OPT_SHOW_LEN, "%s", ld->chainparams->network_name); } */ static void config_register_opts(struct lightningd *ld) { opt_register_arg("--locktime-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 seconds peer can lock up our funds"); opt_register_arg("--anchor-onchain", opt_set_u32, opt_show_u32, &ld->config.anchor_onchain_wait, "Blocks before we give up on pending anchor transaction"); opt_register_arg("--anchor-confirms", opt_set_u32, opt_show_u32, &ld->config.anchor_confirms, "Confirmations required for anchor transaction"); opt_register_arg("--max-anchor-confirms", opt_set_u32, opt_show_u32, &ld->config.anchor_confirms_max, "Maximum confirmations other side can wait for anchor transaction"); opt_register_arg("--forever-confirms", opt_set_u32, opt_show_u32, &ld->config.forever_confirms, "Confirmations after which we consider a reorg impossible"); opt_register_arg("--commit-fee-min=", 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=", 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=", opt_set_u32, opt_show_u32, &ld->config.commitment_fee_percent, "Percentage of fee to request for their commitment"); opt_register_arg("--override-fee-rate", opt_set_u64, opt_show_u64, &ld->topology->override_fee_rate, "Force a specific rate in satoshis per kb regardless of estimated fees"); opt_register_arg("--default-fee-rate", opt_set_u64, opt_show_u64, &ld->topology->default_fee_rate, "Satoshis per kb if can't estimate fees"); opt_register_arg("--min-htlc-expiry", opt_set_u32, opt_show_u32, &ld->config.min_htlc_expiry, "Minimum number of blocks to accept an HTLC before expiry"); opt_register_arg("--max-htlc-expiry", opt_set_u32, opt_show_u32, &ld->config.max_htlc_expiry, "Maximum number of blocks to accept an HTLC before expiry"); opt_register_arg("--deadline-blocks", opt_set_u32, opt_show_u32, &ld->config.deadline_blocks, "Number of blocks before HTLC timeout before we drop connection"); opt_register_arg("--bitcoind-poll", opt_set_time, opt_show_time, &ld->config.poll_time, "Time between polling for new transactions"); opt_register_arg("--commit-time", opt_set_time, opt_show_time, &ld->config.commit_time, "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("--fee-per-satoshi", opt_set_s32, opt_show_s32, &ld->config.fee_per_satoshi, "Microsatoshi fee for every satoshi in HTLC"); opt_register_noarg("--no-reconnect", opt_set_bool, &ld->config.no_reconnect, "Disable automatic reconnect attempts"); opt_register_arg("--ipaddr", opt_set_ipaddr, NULL, &ld->config.ipaddr, "Set the IP address (v4 or v6) to announce to the network for incoming connections"); /* FIXME: Register opt_show_network with the option */ opt_register_early_arg("--network", opt_set_network, NULL, ld, "Select the network parameters (bitcoin, testnet, " "regtest, or litecoin)"); } static void dev_register_opts(struct lightningd *ld) { opt_register_noarg("--dev-no-broadcast", opt_set_bool, &ld->topology->dev_no_broadcast, opt_hidden); opt_register_noarg("--dev-fail-on-subdaemon-fail", opt_set_bool, &ld->dev_subdaemon_fail, opt_hidden); opt_register_arg("--dev-debugger=", opt_subd_debug, NULL, ld, "Wait for gdb attach at start of "); opt_register_arg("--dev-broadcast-interval=", opt_set_uintval, opt_show_uintval, &ld->broadcast_interval, "Time between gossip broadcasts in milliseconds (default: 30000)"); opt_register_arg("--dev-disconnect=", opt_subd_dev_disconnect, NULL, ld, "File containing disconnection points"); } static const struct config testnet_config = { /* 6 blocks to catch cheating attempts. */ .locktime_blocks = 6, /* They can have up to 3 days. */ .locktime_max = 3 * 6 * 24, /* Testnet can have long runs of empty blocks. */ .anchor_onchain_wait = 100, /* We're fairly trusting, under normal circumstances. */ .anchor_confirms = 1, /* More than 10 confirms seems overkill. */ .anchor_confirms_max = 10, /* At some point, you've got to let it go... */ /* FIXME-OLD #onchain: * * Outputs... are considered *irrevocably resolved* once they * are included in a block at least 100 deep on the most-work * blockchain. 100 blocks is far greater than the longest * known bitcoin fork, and the same value used to wait for * confirmations of miner's rewards[1]. */ .forever_confirms = 10, /* 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, /* Don't bother me unless I have 6 hours to collect. */ .min_htlc_expiry = 6 * 6, /* Don't lock up channel for more than 5 days. */ .max_htlc_expiry = 5 * 6 * 24, /* If we're closing on HTLC expiry, and you're unresponsive, we abort. */ .deadline_blocks = 4, /* How often to bother bitcoind. */ .poll_time = TIME_FROM_SEC(10), /* Send commit 10msec after receiving; almost immediately. */ .commit_time = TIME_FROM_MSEC(10), /* Allow dust payments */ .fee_base = 1, /* Take 0.001% */ .fee_per_satoshi = 10, /* Do not advertise any IP */ .ipaddr.type = 0, /* Automatically reconnect */ .no_reconnect = false, }; /* 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 3 days. */ .locktime_max = 3 * 6 * 24, /* You should get in within 10 blocks. */ .anchor_onchain_wait = 10, /* We're fairly trusting, under normal circumstances. */ .anchor_confirms = 3, /* More than 10 confirms seems overkill. */ .anchor_confirms_max = 10, /* At some point, you've got to let it go... */ /* FIXME-OLD #onchain: * * Outputs... are considered *irrevocably resolved* once they * are included in a block at least 100 deep on the most-work * blockchain. 100 blocks is far greater than the longest * known bitcoin fork, and the same value used to wait for * confirmations of miner's rewards[1]. */ .forever_confirms = 100, /* 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, /* Don't bother me unless I have 6 hours to collect. */ .min_htlc_expiry = 6 * 6, /* Don't lock up channel for more than 5 days. */ .max_htlc_expiry = 5 * 6 * 24, /* If we're closing on HTLC expiry, and you're unresponsive, we abort. */ .deadline_blocks = 10, /* How often to bother bitcoind. */ .poll_time = TIME_FROM_SEC(30), /* Send commit 10msec after receiving; almost immediately. */ .commit_time = TIME_FROM_MSEC(10), /* Discourage dust payments */ .fee_base = 546000, /* Take 0.001% */ .fee_per_satoshi = 10, /* Do not advertise any IP */ .ipaddr.type = 0, /* Automatically reconnect */ .no_reconnect = false, }; 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.forever_confirms < 100 && !get_chainparams(ld)->testnet) log_unusual(ld->log, "Warning: forever-confirms of %u is less than 100!", ld->config.forever_confirms); if (ld->config.anchor_confirms == 0) fatal("anchor-confirms must be greater than zero"); /* FIXME-OLD #2: * * a node MUST estimate the deadline for successful redemption * for each HTLC it offers. A node MUST NOT offer a HTLC * after this deadline */ if (ld->config.deadline_blocks >= ld->config.min_htlc_expiry) fatal("Deadline %u can't be more than minimum expiry %u", ld->config.deadline_blocks, ld->config.min_htlc_expiry); } static void setup_default_config(struct lightningd *ld) { if (get_chainparams(ld)->testnet) ld->config = testnet_config; else ld->config = mainnet_config; } /* FIXME: make this nicer! */ static void config_log_stderr_exit(const char *fmt, ...) { char *msg; va_list ap; va_start(ap, fmt); /* This is the format we expect: mangle it to remove '--'. */ 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 *); msg = tal_fmt(NULL, "%s line %s: %.*s: %s", argv0, arg+strlen(arg)+1, 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 **argv; int i, argc; contents = grab_file(ld, "config"); /* Doesn't have to exist. */ if (!contents) { if (errno != ENOENT) fatal("Opening and reading config: %s", 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 argv around, since opt will point into it */ argv = tal_arr(ld, char *, argc = 1); argv[0] = "lightning config file"; for (i = 0; i < tal_count(lines) - 1; i++) { if (strstarts(lines[i], "#")) continue; /* Only valid forms are "foo" and "foo=bar" */ tal_resize(&argv, argc+1); /* Stash line number after nul. */ argv[argc++] = tal_fmt(argv, "--%s%c%u", lines[i], 0, i+1); } tal_resize(&argv, argc+1); argv[argc] = NULL; 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); opt_parse(&argc, argv, config_log_stderr_exit); tal_free(contents); } void register_opts(struct lightningd *ld) { opt_set_alloc(opt_allocfn, tal_reallocfn, tal_freefn); opt_register_early_noarg("--help|-h", opt_usage_and_exit, "\n" "A bitcoin lightning daemon.", "Print this message."); opt_register_arg("--port", opt_set_u16, opt_show_u16, &ld->portnum, "Port to bind to (0 means don't listen)"); opt_register_arg("--bitcoin-datadir", opt_set_charp, NULL, &ld->topology->bitcoind->datadir, "-datadir arg for bitcoin-cli"); opt_register_logging(ld->log); opt_register_version(); configdir_register_opts(ld, &ld->config_dir, &ld->rpc_filename); config_register_opts(ld); dev_register_opts(ld); } bool handle_opts(struct lightningd *ld, int argc, char *argv[]) { bool newdir = false; /* Get any configdir/testnet options first. */ opt_early_parse(argc, argv, opt_log_stderr_exit); /* Move to config dir, to save ourselves the hassle of path manip. */ if (chdir(ld->config_dir) != 0) { log_unusual(ld->log, "Creating lightningd dir %s" " (because chdir gave %s)", ld->config_dir, strerror(errno)); 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)); newdir = true; } /* Now look for config file */ opt_parse_from_config(ld); ld->config.ipaddr.port = ld->portnum; opt_parse(&argc, argv, opt_log_stderr_exit); if (argc != 1) errx(1, "no arguments accepted"); check_config(ld); return newdir; }