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jsonrpc.c
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jsonrpc.c
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/* Code for JSON_RPC API */
/* eg: { "method" : "dev-echo", "params" : [ "hello", "Arabella!" ], "id" : "1" } */
#include <arpa/inet.h>
#include <bitcoin/address.h>
#include <bitcoin/base58.h>
#include <bitcoin/script.h>
#include <ccan/array_size/array_size.h>
#include <ccan/err/err.h>
#include <ccan/io/io.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <common/bech32.h>
#include <common/json_escaped.h>
#include <common/memleak.h>
#include <common/version.h>
#include <common/wallet_tx.h>
#include <common/wireaddr.h>
#include <errno.h>
#include <fcntl.h>
#include <lightningd/chaintopology.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/jsonrpc_errors.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/options.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
struct json_output {
struct list_node list;
const char *json;
};
/* jcon and cmd have separate lifetimes: we detach them on either destruction */
static void destroy_jcon(struct json_connection *jcon)
{
struct command *cmd;
list_for_each(&jcon->commands, cmd, list) {
log_debug(jcon->log, "Abandoning command");
cmd->jcon = NULL;
}
/* Make sure this happens last! */
tal_free(jcon->log);
}
static void destroy_cmd(struct command *cmd)
{
if (cmd->jcon)
list_del_from(&cmd->jcon->commands, &cmd->list);
}
static void json_help(struct command *cmd,
const char *buffer, const jsmntok_t *params);
static const struct json_command help_command = {
"help",
json_help,
"List available commands, or give verbose help on one command.",
.verbose = "help [command]\n"
"Without [command]:\n"
" Outputs an array of objects with 'command' and 'description'\n"
"With [command]:\n"
" Give a single object containing 'verbose', which completely describes\n"
" the command inputs and outputs."
};
AUTODATA(json_command, &help_command);
static void json_stop(struct command *cmd,
const char *buffer UNUSED, const jsmntok_t *params UNUSED)
{
struct json_result *response = new_json_result(cmd);
/* This can't have closed yet! */
cmd->jcon->stop = true;
json_add_string(response, NULL, "Shutting down");
command_success(cmd, response);
}
static const struct json_command stop_command = {
"stop",
json_stop,
"Shut down the lightningd process"
};
AUTODATA(json_command, &stop_command);
#if DEVELOPER
static void json_rhash(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct json_result *response = new_json_result(cmd);
jsmntok_t *secrettok;
struct sha256 secret;
if (!json_get_params(cmd, buffer, params,
"secret", &secrettok,
NULL)) {
return;
}
if (!hex_decode(buffer + secrettok->start,
secrettok->end - secrettok->start,
&secret, sizeof(secret))) {
command_fail(cmd, "'%.*s' is not a valid 32-byte hex value",
secrettok->end - secrettok->start,
buffer + secrettok->start);
return;
}
/* Hash in place. */
sha256(&secret, &secret, sizeof(secret));
json_object_start(response, NULL);
json_add_hex(response, "rhash", &secret, sizeof(secret));
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command dev_rhash_command = {
"dev-rhash",
json_rhash,
"Show SHA256 of {secret}"
};
AUTODATA(json_command, &dev_rhash_command);
static void json_crash(struct command *cmd UNUSED,
const char *buffer UNUSED, const jsmntok_t *params UNUSED)
{
fatal("Crash at user request");
}
static const struct json_command dev_crash_command = {
"dev-crash",
json_crash,
"Crash lightningd by calling fatal()"
};
AUTODATA(json_command, &dev_crash_command);
#endif /* DEVELOPER */
static void json_getinfo(struct command *cmd,
const char *buffer UNUSED, const jsmntok_t *params UNUSED)
{
struct json_result *response = new_json_result(cmd);
json_object_start(response, NULL);
json_add_pubkey(response, "id", &cmd->ld->id);
if (cmd->ld->listen) {
if (deprecated_apis)
json_add_num(response, "port", cmd->ld->portnum);
/* These are the addresses we're announcing */
json_array_start(response, "address");
for (size_t i = 0; i < tal_count(cmd->ld->announcable); i++)
json_add_address(response, NULL, cmd->ld->announcable+i);
json_array_end(response);
/* This is what we're actually bound to. */
json_array_start(response, "binding");
for (size_t i = 0; i < tal_count(cmd->ld->binding); i++)
json_add_address_internal(response, NULL,
cmd->ld->binding+i);
json_array_end(response);
}
json_add_string(response, "version", version());
json_add_num(response, "blockheight", get_block_height(cmd->ld->topology));
json_add_string(response, "network", get_chainparams(cmd->ld)->network_name);
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command getinfo_command = {
"getinfo",
json_getinfo,
"Show information about this node"
};
AUTODATA(json_command, &getinfo_command);
static size_t num_cmdlist;
static struct json_command **get_cmdlist(void)
{
static struct json_command **cmdlist;
if (!cmdlist)
cmdlist = autodata_get(json_command, &num_cmdlist);
return cmdlist;
}
static void json_help(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
unsigned int i;
struct json_result *response = new_json_result(cmd);
struct json_command **cmdlist = get_cmdlist();
jsmntok_t *cmdtok;
if (!json_get_params(cmd, buffer, params, "?command", &cmdtok, NULL)) {
return;
}
json_object_start(response, NULL);
if (cmdtok) {
for (i = 0; i < num_cmdlist; i++) {
if (json_tok_streq(buffer, cmdtok, cmdlist[i]->name)) {
if (!cmdlist[i]->verbose)
json_add_string(response,
"verbose",
"HELP! Please contribute"
" a description for this"
" command!");
else {
struct json_escaped *esc;
esc = json_escape(NULL,
cmdlist[i]->verbose);
json_add_escaped_string(response,
"verbose",
take(esc));
}
goto done;
}
}
command_fail(cmd, "Unknown command '%.*s'",
cmdtok->end - cmdtok->start,
buffer + cmdtok->start);
return;
}
json_array_start(response, "help");
for (i = 0; i < num_cmdlist; i++) {
json_add_object(response,
"command", JSMN_STRING,
cmdlist[i]->name,
"description", JSMN_STRING,
cmdlist[i]->description,
NULL);
}
json_array_end(response);
done:
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command *find_cmd(const char *buffer,
const jsmntok_t *tok)
{
unsigned int i;
struct json_command **cmdlist = get_cmdlist();
/* cmdlist[i]->name can be NULL in test code. */
for (i = 0; i < num_cmdlist; i++)
if (cmdlist[i]->name
&& json_tok_streq(buffer, tok, cmdlist[i]->name))
return cmdlist[i];
return NULL;
}
static void json_done(struct json_connection *jcon,
struct command *cmd,
const char *json TAKES)
{
struct json_output *out = tal(jcon, struct json_output);
out->json = tal_strdup(out, json);
tal_free(cmd);
/* Queue for writing, and wake writer. */
list_add_tail(&jcon->output, &out->list);
io_wake(jcon);
}
static void connection_complete_ok(struct json_connection *jcon,
struct command *cmd,
const char *id,
const struct json_result *result)
{
assert(id != NULL);
assert(result != NULL);
/* This JSON is simple enough that we build manually */
json_done(jcon, cmd, take(tal_fmt(jcon,
"{ \"jsonrpc\": \"2.0\", "
"\"result\" : %s,"
" \"id\" : %s }\n",
json_result_string(result), id)));
}
static void connection_complete_error(struct json_connection *jcon,
struct command *cmd,
const char *id,
const char *errmsg,
int code,
const struct json_result *data)
{
struct json_escaped *esc;
const char *data_str;
esc = json_escape(tmpctx, errmsg);
if (data)
data_str = tal_fmt(tmpctx, ", \"data\" : %s",
json_result_string(data));
else
data_str = "";
assert(id != NULL);
json_done(jcon, cmd, take(tal_fmt(tmpctx,
"{ \"jsonrpc\": \"2.0\", "
" \"error\" : "
"{ \"code\" : %d,"
" \"message\" : \"%s\"%s },"
" \"id\" : %s }\n",
code,
esc->s,
data_str,
id)));
}
struct json_result *null_response(const tal_t *ctx)
{
struct json_result *response;
response = new_json_result(ctx);
json_object_start(response, NULL);
json_object_end(response);
return response;
}
static bool cmd_in_jcon(const struct json_connection *jcon,
const struct command *cmd)
{
const struct command *i;
list_for_each(&jcon->commands, i, list)
if (i == cmd)
return true;
return false;
}
void command_success(struct command *cmd, struct json_result *result)
{
struct json_connection *jcon = cmd->jcon;
if (!jcon) {
log_debug(cmd->ld->log,
"Command returned result after jcon close");
tal_free(cmd);
return;
}
assert(cmd_in_jcon(jcon, cmd));
connection_complete_ok(jcon, cmd, cmd->id, result);
log_debug(jcon->log, "Success");
}
static void command_fail_v(struct command *cmd,
int code,
const struct json_result *data,
const char *fmt, va_list ap)
{
char *error;
struct json_connection *jcon = cmd->jcon;
if (!jcon) {
log_debug(cmd->ld->log,
"Command failed after jcon close");
tal_free(cmd);
return;
}
error = tal_vfmt(cmd, fmt, ap);
log_debug(jcon->log, "Failing: %s", error);
assert(cmd_in_jcon(jcon, cmd));
connection_complete_error(jcon, cmd, cmd->id, error, code, data);
}
void command_fail(struct command *cmd, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
command_fail_v(cmd, -1, NULL, fmt, ap);
va_end(ap);
}
void command_fail_detailed(struct command *cmd,
int code, const struct json_result *data,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
command_fail_v(cmd, code, data, fmt, ap);
va_end(ap);
}
void command_still_pending(struct command *cmd)
{
notleak_with_children(cmd);
notleak(cmd->jcon);
cmd->pending = true;
}
static void json_command_malformed(struct json_connection *jcon,
const char *id,
const char *error)
{
return connection_complete_error(jcon, NULL, id, error,
JSONRPC2_INVALID_REQUEST, NULL);
}
static void parse_request(struct json_connection *jcon, const jsmntok_t tok[])
{
const jsmntok_t *method, *id, *params;
const struct json_command *cmd;
struct command *c;
if (tok[0].type != JSMN_OBJECT) {
json_command_malformed(jcon, "null",
"Expected {} for json command");
return;
}
method = json_get_member(jcon->buffer, tok, "method");
params = json_get_member(jcon->buffer, tok, "params");
id = json_get_member(jcon->buffer, tok, "id");
if (!id) {
json_command_malformed(jcon, "null", "No id");
return;
}
if (id->type != JSMN_STRING && id->type != JSMN_PRIMITIVE) {
json_command_malformed(jcon, "null",
"Expected string/primitive for id");
return;
}
/* This is a convenient tal parent for duration of command
* (which may outlive the conn!). */
c = tal(jcon->ld, struct command);
c->jcon = jcon;
c->ld = jcon->ld;
c->pending = false;
c->id = tal_strndup(c,
json_tok_contents(jcon->buffer, id),
json_tok_len(id));
list_add(&jcon->commands, &c->list);
tal_add_destructor(c, destroy_cmd);
if (!method || !params) {
command_fail_detailed(c,
JSONRPC2_INVALID_REQUEST, NULL,
method ? "No params" : "No method");
return;
}
if (method->type != JSMN_STRING) {
command_fail_detailed(c,
JSONRPC2_INVALID_REQUEST, NULL,
"Expected string for method");
return;
}
cmd = find_cmd(jcon->buffer, method);
if (!cmd) {
command_fail_detailed(c,
JSONRPC2_METHOD_NOT_FOUND, NULL,
"Unknown command '%.*s'",
method->end - method->start,
jcon->buffer + method->start);
return;
}
if (cmd->deprecated && !deprecated_apis) {
command_fail_detailed(c,
JSONRPC2_METHOD_NOT_FOUND, NULL,
"Command '%.*s' is deprecated",
method->end - method->start,
jcon->buffer + method->start);
return;
}
db_begin_transaction(jcon->ld->wallet->db);
cmd->dispatch(c, jcon->buffer, params);
db_commit_transaction(jcon->ld->wallet->db);
/* If they didn't complete it, they must call command_still_pending */
if (cmd_in_jcon(jcon, c))
assert(c->pending);
}
bool json_get_params(struct command *cmd,
const char *buffer, const jsmntok_t param[], ...)
{
va_list ap;
const char **names;
size_t num_names;
/* Uninitialized warnings on p and end */
const jsmntok_t *p = NULL, *end = NULL;
if (param->type == JSMN_ARRAY) {
if (param->size == 0)
p = NULL;
else
p = param + 1;
end = json_next(param);
} else if (param->type != JSMN_OBJECT) {
command_fail_detailed(cmd, JSONRPC2_INVALID_PARAMS, NULL,
"Expected array or object for params");
return false;
}
num_names = 0;
names = tal_arr(cmd, const char *, num_names + 1);
va_start(ap, param);
while ((names[num_names] = va_arg(ap, const char *)) != NULL) {
const jsmntok_t **tokptr = va_arg(ap, const jsmntok_t **);
bool compulsory = true;
if (names[num_names][0] == '?') {
names[num_names]++;
compulsory = false;
}
if (param->type == JSMN_ARRAY) {
*tokptr = p;
if (p) {
p = json_next(p);
if (p == end)
p = NULL;
}
} else {
*tokptr = json_get_member(buffer, param,
names[num_names]);
}
/* Convert 'null' to NULL */
if (*tokptr
&& (*tokptr)->type == JSMN_PRIMITIVE
&& buffer[(*tokptr)->start] == 'n') {
*tokptr = NULL;
}
if (compulsory && !*tokptr) {
va_end(ap);
command_fail_detailed(cmd, JSONRPC2_INVALID_PARAMS, NULL,
"Missing '%s' parameter",
names[num_names]);
return false;
}
num_names++;
tal_resize(&names, num_names + 1);
}
va_end(ap);
/* Now make sure there aren't any params which aren't valid */
if (param->type == JSMN_ARRAY) {
if (param->size > num_names) {
tal_free(names);
command_fail_detailed(cmd, JSONRPC2_INVALID_PARAMS, NULL,
"Too many parameters:"
" got %u, expected %zu",
param->size, num_names);
return false;
}
} else {
const jsmntok_t *t;
end = json_next(param);
/* Find each parameter among the valid names */
for (t = param + 1; t < end; t = json_next(t+1)) {
bool found = false;
for (size_t i = 0; i < num_names; i++) {
if (json_tok_streq(buffer, t, names[i]))
found = true;
}
if (!found) {
tal_free(names);
command_fail_detailed(cmd,
JSONRPC2_INVALID_PARAMS,
NULL,
"Unknown parameter '%.*s'",
t->end - t->start,
buffer + t->start);
return false;
}
}
}
tal_free(names);
return true;
}
static struct io_plan *write_json(struct io_conn *conn,
struct json_connection *jcon)
{
struct json_output *out;
out = list_pop(&jcon->output, struct json_output, list);
if (!out) {
if (jcon->stop) {
log_unusual(jcon->log, "JSON-RPC shutdown");
/* Return us to toplevel lightningd.c */
io_break(jcon->ld);
return io_close(conn);
}
/* Wait for more output. */
return io_out_wait(conn, jcon, write_json, jcon);
}
jcon->outbuf = tal_steal(jcon, out->json);
tal_free(out);
log_io(jcon->log, LOG_IO_OUT, "", jcon->outbuf, strlen(jcon->outbuf));
return io_write(conn,
jcon->outbuf, strlen(jcon->outbuf), write_json, jcon);
}
static struct io_plan *read_json(struct io_conn *conn,
struct json_connection *jcon)
{
jsmntok_t *toks;
bool valid;
log_io(jcon->log, LOG_IO_IN, "",
jcon->buffer + jcon->used, jcon->len_read);
/* Resize larger if we're full. */
jcon->used += jcon->len_read;
if (jcon->used == tal_count(jcon->buffer))
tal_resize(&jcon->buffer, jcon->used * 2);
again:
toks = json_parse_input(jcon->buffer, jcon->used, &valid);
if (!toks) {
if (!valid) {
log_unusual(jcon->ld->log,
"Invalid token in json input: '%.*s'",
(int)jcon->used, jcon->buffer);
json_command_malformed(
jcon, "null",
"Invalid token in json input");
return io_halfclose(conn);
}
/* We need more. */
goto read_more;
}
/* Empty buffer? (eg. just whitespace). */
if (tal_count(toks) == 1) {
jcon->used = 0;
goto read_more;
}
parse_request(jcon, toks);
/* Remove first {}. */
memmove(jcon->buffer, jcon->buffer + toks[0].end,
tal_count(jcon->buffer) - toks[0].end);
jcon->used -= toks[0].end;
tal_free(toks);
/* See if we can parse the rest. */
goto again;
read_more:
tal_free(toks);
return io_read_partial(conn, jcon->buffer + jcon->used,
tal_count(jcon->buffer) - jcon->used,
&jcon->len_read, read_json, jcon);
}
static struct io_plan *jcon_connected(struct io_conn *conn,
struct lightningd *ld)
{
struct json_connection *jcon;
jcon = tal(conn, struct json_connection);
jcon->ld = ld;
jcon->used = 0;
jcon->buffer = tal_arr(jcon, char, 64);
jcon->stop = false;
list_head_init(&jcon->commands);
/* We want to log on destruction, so we free this in destructor. */
jcon->log = new_log(ld->log_book, ld->log_book, "%sjcon fd %i:",
log_prefix(ld->log), io_conn_fd(conn));
list_head_init(&jcon->output);
tal_add_destructor(jcon, destroy_jcon);
return io_duplex(conn,
io_read_partial(conn, jcon->buffer,
tal_count(jcon->buffer),
&jcon->len_read, read_json, jcon),
write_json(conn, jcon));
}
static struct io_plan *incoming_jcon_connected(struct io_conn *conn,
struct lightningd *ld)
{
log_debug(ld->log, "Connected json input");
/* Lifetime of JSON conn is limited to fd connect time. */
return jcon_connected(notleak(conn), ld);
}
void setup_jsonrpc(struct lightningd *ld, const char *rpc_filename)
{
struct sockaddr_un addr;
int fd, old_umask;
if (streq(rpc_filename, ""))
return;
if (streq(rpc_filename, "/dev/tty")) {
fd = open(rpc_filename, O_RDWR);
if (fd == -1)
err(1, "Opening %s", rpc_filename);
/* Technically this is a leak, but there's only one */
notleak(io_new_conn(ld, fd, jcon_connected, ld));
return;
}
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
errx(1, "domain socket creation failed");
}
if (strlen(rpc_filename) + 1 > sizeof(addr.sun_path))
errx(1, "rpc filename '%s' too long", rpc_filename);
strcpy(addr.sun_path, rpc_filename);
addr.sun_family = AF_UNIX;
/* Of course, this is racy! */
if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) == 0)
errx(1, "rpc filename '%s' in use", rpc_filename);
unlink(rpc_filename);
/* This file is only rw by us! */
old_umask = umask(0177);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)))
err(1, "Binding rpc socket to '%s'", rpc_filename);
umask(old_umask);
if (listen(fd, 1) != 0)
err(1, "Listening on '%s'", rpc_filename);
log_debug(ld->log, "Listening on '%s'", rpc_filename);
/* Technically this is a leak, but there's only one */
notleak(io_new_listener(ld, fd, incoming_jcon_connected, ld));
}
/**
* segwit_addr_net_decode - Try to decode a Bech32 address and detect
* testnet/mainnet/regtest
*
* This processes the address and returns a string if it is a Bech32
* address specified by BIP173. The string is set whether it is
* testnet ("tb"), mainnet ("bc"), or regtest ("bcrt")
* It does not check, witness version and program size restrictions.
*
* Out: witness_version: Pointer to an int that will be updated to contain
* the witness program version (between 0 and 16 inclusive).
* witness_program: Pointer to a buffer of size 40 that will be updated
* to contain the witness program bytes.
* witness_program_len: Pointer to a size_t that will be updated to
* contain the length of bytes in witness_program.
* In: addrz: Pointer to the null-terminated address.
* Returns string containing the human readable segment of bech32 address
*/
static const char* segwit_addr_net_decode(int *witness_version,
uint8_t *witness_program,
size_t *witness_program_len,
const char *addrz)
{
const char *network[] = { "bc", "tb", "bcrt" };
for (int i = 0; i < sizeof(network) / sizeof(*network); ++i) {
if (segwit_addr_decode(witness_version,
witness_program, witness_program_len,
network[i], addrz))
return network[i];
}
return NULL;
}
enum address_parse_result
json_tok_address_scriptpubkey(const tal_t *cxt,
const struct chainparams *chainparams,
const char *buffer,
const jsmntok_t *tok, const u8 **scriptpubkey)
{
struct bitcoin_address p2pkh_destination;
struct ripemd160 p2sh_destination;
int witness_version;
/* segwit_addr_net_decode requires a buffer of size 40, and will
* not write to the buffer if the address is too long, so a buffer
* of fixed size 40 will not overflow. */
uint8_t witness_program[40];
size_t witness_program_len;
char *addrz;
const char *bip173;
bool parsed;
bool right_network;
bool testnet;
parsed = false;
if (bitcoin_from_base58(&testnet, &p2pkh_destination,
buffer + tok->start, tok->end - tok->start)) {
*scriptpubkey = scriptpubkey_p2pkh(cxt, &p2pkh_destination);
parsed = true;
right_network = (testnet == chainparams->testnet);
} else if (p2sh_from_base58(&testnet, &p2sh_destination,
buffer + tok->start, tok->end - tok->start)) {
*scriptpubkey = scriptpubkey_p2sh_hash(cxt, &p2sh_destination);
parsed = true;
right_network = (testnet == chainparams->testnet);
}
/* Insert other parsers that accept pointer+len here. */
if (parsed) {
if (right_network)
return ADDRESS_PARSE_SUCCESS;
else
return ADDRESS_PARSE_WRONG_NETWORK;
}
/* Generate null-terminated address. */
addrz = tal_dup_arr(cxt, char, buffer + tok->start, tok->end - tok->start, 1);
addrz[tok->end - tok->start] = '\0';
bip173 = segwit_addr_net_decode(&witness_version, witness_program,
&witness_program_len, addrz);
if (bip173) {
bool witness_ok = false;
if (witness_version == 0 && (witness_program_len == 20 ||
witness_program_len == 32)) {
witness_ok = true;
}
/* Insert other witness versions here. */
if (witness_ok) {
*scriptpubkey = scriptpubkey_witness_raw(cxt, witness_version,
witness_program, witness_program_len);
parsed = true;
right_network = streq(bip173, chainparams->bip173_name);
}
}
/* Insert other parsers that accept null-terminated string here. */
tal_free(addrz);
if (parsed) {
if (right_network)
return ADDRESS_PARSE_SUCCESS;
else
return ADDRESS_PARSE_WRONG_NETWORK;
}
return ADDRESS_PARSE_UNRECOGNIZED;
}
bool json_tok_wtx(struct wallet_tx * tx, const char * buffer,
const jsmntok_t *sattok)
{
if (json_tok_streq(buffer, sattok, "all")) {
tx->all_funds = true;
} else if (!json_tok_u64(buffer, sattok, &tx->amount)) {
command_fail(tx->cmd, "Invalid satoshis");
return false;
}
return true;
}