385 lines
11 KiB
C
385 lines
11 KiB
C
/* Code for talking to bitcoind. We use bitcoin-cli. */
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#include "bitcoin/base58.h"
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#include "bitcoin/shadouble.h"
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#include "bitcoin/tx.h"
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#include "bitcoind.h"
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#include "json.h"
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#include "lightningd.h"
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#include "log.h"
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#include <ccan/cast/cast.h>
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#include <ccan/io/io.h>
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#include <ccan/pipecmd/pipecmd.h>
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#include <ccan/str/hex/hex.h>
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#include <ccan/tal/grab_file/grab_file.h>
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#include <ccan/tal/path/path.h>
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#include <ccan/tal/str/str.h>
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#include <ccan/tal/tal.h>
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#include <errno.h>
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#include <inttypes.h>
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#define BITCOIN_CLI "bitcoin-cli"
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static char **gather_args(const tal_t *ctx, const char *cmd, va_list ap)
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{
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size_t n = 2;
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char **args = tal_arr(ctx, char *, n+1);
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args[0] = BITCOIN_CLI;
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args[1] = cast_const(char *, cmd);
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while ((args[n] = va_arg(ap, char *)) != NULL) {
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args[n] = tal_strdup(args, args[n]);
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n++;
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tal_resize(&args, n + 1);
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}
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return args;
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}
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struct bitcoin_cli {
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struct list_node list;
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struct lightningd_state *dstate;
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int fd;
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pid_t pid;
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char **args;
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char *output;
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size_t output_bytes;
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size_t new_output;
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void (*process)(struct bitcoin_cli *);
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void *cb;
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void *cb_arg;
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};
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static struct io_plan *read_more(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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bcli->output_bytes += bcli->new_output;
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if (bcli->output_bytes == tal_count(bcli->output))
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tal_resize(&bcli->output, bcli->output_bytes * 2);
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return io_read_partial(conn, bcli->output + bcli->output_bytes,
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tal_count(bcli->output) - bcli->output_bytes,
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&bcli->new_output, read_more, bcli);
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}
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static struct io_plan *output_init(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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bcli->output_bytes = bcli->new_output = 0;
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bcli->output = tal_arr(bcli, char, 100);
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return read_more(conn, bcli);
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}
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static void next_bcli(struct lightningd_state *dstate);
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static void bcli_finished(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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int ret, status;
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struct lightningd_state *dstate = bcli->dstate;
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/* FIXME: If we waited for SIGCHILD, this could never hang! */
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ret = waitpid(bcli->pid, &status, 0);
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if (ret != bcli->pid)
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fatal("bitcoind: '%s' '%s' %s",
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bcli->args[0], bcli->args[1],
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ret == 0 ? "not exited?" : strerror(errno));
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if (!WIFEXITED(status))
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fatal("bitcoind: '%s' '%s' died with signal %i",
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bcli->args[0], bcli->args[1],
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WTERMSIG(status));
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if (WEXITSTATUS(status) != 0)
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fatal("bitcoind: '%s' '%s' failed (%i '%.*s')",
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bcli->args[0], bcli->args[1], WEXITSTATUS(status),
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(int)bcli->output_bytes, bcli->output);
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log_debug(dstate->base_log, "reaped %u: %s", ret, bcli->args[1]);
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dstate->bitcoin_req_running = false;
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bcli->process(bcli);
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next_bcli(dstate);
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}
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static void next_bcli(struct lightningd_state *dstate)
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{
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struct bitcoin_cli *bcli;
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struct io_conn *conn;
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if (dstate->bitcoin_req_running)
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return;
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bcli = list_pop(&dstate->bitcoin_req, struct bitcoin_cli, list);
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if (!bcli)
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return;
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log_debug(bcli->dstate->base_log, "starting: %s", bcli->args[1]);
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bcli->pid = pipecmdarr(&bcli->fd, NULL, &bcli->fd, bcli->args);
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if (bcli->pid < 0)
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fatal("%s exec failed: %s", bcli->args[0], strerror(errno));
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dstate->bitcoin_req_running = true;
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conn = io_new_conn(dstate, bcli->fd, output_init, bcli);
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tal_steal(conn, bcli);
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io_set_finish(conn, bcli_finished, bcli);
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}
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static void
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start_bitcoin_cli(struct lightningd_state *dstate,
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void (*process)(struct bitcoin_cli *),
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void *cb, void *cb_arg,
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char *cmd, ...)
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{
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va_list ap;
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struct bitcoin_cli *bcli = tal(dstate, struct bitcoin_cli);
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bcli->dstate = dstate;
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bcli->process = process;
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bcli->cb = cb;
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bcli->cb_arg = cb_arg;
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va_start(ap, cmd);
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bcli->args = gather_args(bcli, cmd, ap);
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va_end(ap);
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list_add_tail(&dstate->bitcoin_req, &bcli->list);
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next_bcli(dstate);
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}
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static void process_importaddress(struct bitcoin_cli *bcli)
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{
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if (bcli->output_bytes != 0)
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fatal("bitcoind: '%s' '%s' unexpeced output '%.*s'",
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bcli->args[0], bcli->args[1],
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(int)bcli->output_bytes, bcli->output);
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}
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void bitcoind_watch_addr(struct lightningd_state *dstate,
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const struct ripemd160 *redeemhash)
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{
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char *p2shaddr = p2sh_to_base58(dstate, dstate->config.testnet,
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redeemhash);
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start_bitcoin_cli(dstate, process_importaddress, NULL, NULL,
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"importaddress", p2shaddr, "", "false", NULL);
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tal_free(p2shaddr);
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}
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static void process_transactions(struct bitcoin_cli *bcli)
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{
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const jsmntok_t *tokens, *t, *end;
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bool valid;
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void (*cb)(struct lightningd_state *dstate,
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const struct sha256_double *txid,
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int confirmations, bool is_coinbase) = bcli->cb;
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tokens = json_parse_input(bcli->output, bcli->output_bytes, &valid);
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if (!tokens)
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fatal("bitcoind: '%s' '%s' %s response",
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bcli->args[0], bcli->args[1],
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valid ? "partial" : "invalid");
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if (tokens[0].type != JSMN_ARRAY)
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fatal("listtransactions: '%s' '%s' gave non-array (%.*s)?",
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bcli->args[0], bcli->args[1],
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(int)bcli->output_bytes, bcli->output);
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end = json_next(tokens);
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for (t = tokens + 1; t < end; t = json_next(t)) {
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struct sha256_double txid;
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const jsmntok_t *txidtok, *conftok, *blkindxtok;
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unsigned int conf;
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bool is_coinbase;
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txidtok = json_get_member(bcli->output, t, "txid");
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conftok = json_get_member(bcli->output, t, "confirmations");
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blkindxtok = json_get_member(bcli->output, t, "blockindex");
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if (!txidtok || !conftok)
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fatal("listtransactions: no %s field!",
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txidtok ? "confirmations" : "txid");
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if (!bitcoin_txid_from_hex(bcli->output + txidtok->start,
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txidtok->end - txidtok->start,
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&txid)) {
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fatal("listtransactions: bad txid '%.*s'",
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(int)(txidtok->end - txidtok->start),
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bcli->output + txidtok->start);
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}
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if (!json_tok_number(bcli->output, conftok, &conf))
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fatal("listtransactions: bad confirmations '%.*s'",
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(int)(conftok->end - conftok->start),
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bcli->output + conftok->start);
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/* This can happen with zero conf. */
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blkindxtok = json_get_member(bcli->output, t, "blockindex");
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if (!blkindxtok)
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is_coinbase = false;
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else {
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unsigned int blkidx;
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if (!json_tok_number(bcli->output, blkindxtok, &blkidx))
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fatal("listtransactions: bad blockindex '%.*s'",
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(int)(blkindxtok->end - blkindxtok->start),
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bcli->output + blkindxtok->start);
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is_coinbase = (blkidx == 0);
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}
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/* FIXME: log txid */
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log_debug(bcli->dstate->base_log,
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"txid %02x%02x%02x%02x..., conf %u, coinbase %u",
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txid.sha.u.u8[0], txid.sha.u.u8[1],
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txid.sha.u.u8[2], txid.sha.u.u8[3],
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conf, is_coinbase);
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cb(bcli->dstate, &txid, conf, is_coinbase);
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}
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}
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void bitcoind_poll_transactions(struct lightningd_state *dstate,
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void (*cb)(struct lightningd_state *dstate,
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const struct sha256_double *txid,
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int confirmations,
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bool is_coinbase))
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{
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/* FIXME: Iterate and detect duplicates. */
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start_bitcoin_cli(dstate, process_transactions, cb, NULL,
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"listtransactions", "*", "100000", "0", "true",
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NULL);
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}
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static void process_rawtx(struct bitcoin_cli *bcli)
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{
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struct bitcoin_tx *tx;
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void (*cb)(struct lightningd_state *dstate,
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const struct bitcoin_tx *tx, void *arg) = bcli->cb;
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tx = bitcoin_tx_from_hex(bcli, bcli->output, bcli->output_bytes);
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if (!tx)
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fatal("Unknown txid (output %.*s)",
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(int)bcli->output_bytes, (char *)bcli->output);
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cb(bcli->dstate, tx, bcli->cb_arg);
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}
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/* FIXME: Cache! */
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void bitcoind_txid_lookup_(struct lightningd_state *dstate,
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const struct sha256_double *txid,
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void (*cb)(struct lightningd_state *dstate,
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const struct bitcoin_tx *tx,
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void *arg),
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void *arg)
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{
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char txidhex[hex_str_size(sizeof(*txid))];
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if (!bitcoin_txid_to_hex(txid, txidhex, sizeof(txidhex)))
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fatal("Incorrect txid size");
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start_bitcoin_cli(dstate, process_rawtx, cb, arg,
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"getrawtransaction", txidhex, NULL);
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}
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static void process_sendrawrx(struct bitcoin_cli *bcli)
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{
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struct sha256_double txid;
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const char *out = (char *)bcli->output;
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/* We expect a txid, plus \n */
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if (bcli->output_bytes == 0
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|| !bitcoin_txid_from_hex(out, bcli->output_bytes-1, &txid))
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fatal("sendrawtransaction failed: %.*s",
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(int)bcli->output_bytes, out);
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log_debug(bcli->dstate->base_log, "sendrawtx gave %.*s",
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(int)bcli->output_bytes, out);
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/* FIXME: Compare against expected txid? */
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}
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void bitcoind_send_tx(struct lightningd_state *dstate,
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const struct bitcoin_tx *tx)
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{
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u8 *raw = linearize_tx(dstate, tx);
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char *hex = tal_arr(raw, char, hex_str_size(tal_count(raw)));
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hex_encode(raw, tal_count(raw), hex, tal_count(hex));
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start_bitcoin_cli(dstate, process_sendrawrx, NULL, NULL,
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"sendrawtransaction", hex, NULL);
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tal_free(raw);
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}
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static void process_sendtoaddress(struct bitcoin_cli *bcli)
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{
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const char *out = (char *)bcli->output;
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char *txidstr;
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/* We expect a txid (followed by \n, vs hex_str_size including \0) */
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if (bcli->output_bytes != hex_str_size(sizeof(struct sha256_double)))
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fatal("sendtoaddress failed: %.*s",
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(int)bcli->output_bytes, out);
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txidstr = tal_strndup(bcli, out, bcli->output_bytes-1);
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log_debug(bcli->dstate->base_log, "sendtoaddress gave %s", txidstr);
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/* Now we need the raw transaction. */
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start_bitcoin_cli(bcli->dstate, process_rawtx, bcli->cb, bcli->cb_arg,
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"getrawtransaction", txidstr, NULL);
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}
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void bitcoind_create_payment(struct lightningd_state *dstate,
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const char *addr,
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u64 satoshis,
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void (*cb)(struct lightningd_state *dstate,
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const struct bitcoin_tx *tx,
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struct peer *peer),
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struct peer *peer)
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{
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char amtstr[STR_MAX_CHARS(satoshis) * 2 + 1];
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sprintf(amtstr, "%"PRIu64 "." "%08"PRIu64,
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satoshis / 100000000, satoshis % 100000000);
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start_bitcoin_cli(dstate, process_sendtoaddress, cb, peer,
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"sendtoaddress", addr, amtstr, NULL);
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}
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/* We make sure they have walletbroadcast=0, so we don't broadcast
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* the anchor. */
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void check_bitcoind_config(struct lightningd_state *dstate)
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{
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void *ctx = tal(dstate, char);
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char *path, *config, **lines;
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size_t i;
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bool nowalletbroadcast = false;
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int testnet = -1, regtest = -1;
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path = path_simplify(ctx, path_join(ctx, path_cwd(ctx),
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"../.bitcoin/bitcoin.conf"));
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config = grab_file(ctx, path);
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if (!config) {
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log_unusual(dstate->base_log, "Could not open %s to check it",
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path);
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goto out;
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}
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lines = tal_strsplit(ctx, config, "\n", STR_NO_EMPTY);
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for (i = 0; lines[i]; i++) {
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char *str;
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if (tal_strreg(ctx, lines[i],
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"^[ \t]*walletbroadcast[ \t]*=[ \t]*0"))
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nowalletbroadcast = true;
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else if (tal_strreg(ctx, lines[i],
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"^[ \t]*testnet[ \t]*=[ \t]*([01])", &str))
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testnet = atoi(str);
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else if (tal_strreg(ctx, lines[i],
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"^[ \t]*regtest[ \t]*=[ \t]*([01])", &str))
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regtest = atoi(str);
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}
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if (!nowalletbroadcast)
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log_unusual(dstate->base_log,
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"%s does not contain walletbroadcast=0",
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path);
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if (dstate->config.testnet) {
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if (testnet != 1 && regtest != 1)
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log_unusual(dstate->base_log,
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"%s does not set testnet/regtest,"
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" but we are on testnet.",
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path);
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} else if (testnet == 1 || regtest == 1)
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log_unusual(dstate->base_log,
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"%s sets %s, but we are not on testnet",
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path, testnet == 1 ? "testnet" : "regtest");
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out:
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tal_free(ctx);
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}
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