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/*
* Helper to submit via JSON-RPC and get back response.
*/
#include <ccan/err/err.h>
#include <ccan/opt/opt.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/str/str.h>
#include <ccan/tal/str/str.h>
#include <common/configdir.h>
#include <common/json.h>
#include <common/utils.h>
#include <common/version.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#define NO_ERROR 0
#define ERROR_FROM_LIGHTNINGD 1
#define ERROR_TALKING_TO_LIGHTNINGD 2
#define ERROR_USAGE 3
/* 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);
}
struct netaddr;
/* Returns number of tokens digested */
static size_t human_readable(const char *buffer, const jsmntok_t *t, char term)
{
size_t i, n;
switch (t->type) {
case JSMN_PRIMITIVE:
case JSMN_STRING:
for (i = t->start; i < t->end; i++) {
/* We only translate \n and \t. */
if (buffer[i] == '\\' && i + 1 < t->end) {
if (buffer[i+1] == 'n') {
fputc('\n', stdout);
i++;
continue;
} else if (buffer[i+1] == 't') {
fputc('\t', stdout);
i++;
continue;
}
}
fputc(buffer[i], stdout);
}
fputc(term, stdout);
return 1;
case JSMN_ARRAY:
n = 1;
for (i = 0; i < t->size; i++)
n += human_readable(buffer, t + n, '\n');
return n;
case JSMN_OBJECT:
/* Elide single-field objects */
if (t->size == 1)
return human_readable(buffer, t + 2, '\n') + 3;
n = 1;
for (i = 0; i < t->size; i++) {
n += human_readable(buffer, t + n, '=');
n += human_readable(buffer, t + n, '\n');
}
return n;
case JSMN_UNDEFINED:
break;
}
abort();
}
static void human_help(const char *buffer, const jsmntok_t *result) {
int i;
const jsmntok_t * help_array = result + 2;
/* the first command object */
const jsmntok_t * curr = help_array + 1;
/* iterate through all commands, printing the name and description */
for (i = 0; i<help_array->size; i++) {
curr += 2;
printf("%.*s\n", curr->end - curr->start, buffer + curr->start);
curr += 2;
printf(" %.*s\n\n", curr->end - curr->start, buffer + curr->start);
/* advance to next command */
curr++;
}
}
enum format {
JSON,
HUMAN,
DEFAULT_FORMAT
};
static char *opt_set_human(enum format *format)
{
*format = HUMAN;
return NULL;
}
static char *opt_set_json(enum format *format)
{
*format = JSON;
return NULL;
}
enum input {
KEYWORDS,
ORDERED,
DEFAULT_INPUT
};
static char *opt_set_keywords(enum input *input)
{
*input = KEYWORDS;
return NULL;
}
static char *opt_set_ordered(enum input *input)
{
*input = ORDERED;
return NULL;
}
static bool is_literal(const char *arg)
{
size_t arglen = strlen(arg);
return strspn(arg, "0123456789") == arglen
|| streq(arg, "true")
|| streq(arg, "false")
|| streq(arg, "null")
|| (arg[0] == '{' && arg[arglen - 1] == '}')
|| (arg[0] == '[' && arg[arglen - 1] == ']')
|| (arg[0] == '"' && arg[arglen - 1] == '"');
}
static void add_input(char **cmd, const char *input,
int i, int argc)
{
/* Numbers, bools, objects and arrays are left unquoted,
* and quoted things left alone. */
if (is_literal(input))
tal_append_fmt(cmd, "%s", input);
else
tal_append_fmt(cmd, "\"%s\"", input);
if (i != argc - 1)
tal_append_fmt(cmd, ", ");
}
int main(int argc, char *argv[])
{
setup_locale();
int fd, i, off;
const char *method;
char *cmd, *resp, *idstr, *rpc_filename;
struct sockaddr_un addr;
jsmntok_t *toks;
const jsmntok_t *result, *error, *id;
char *lightning_dir;
const tal_t *ctx = tal(NULL, char);
jsmn_parser parser;
int parserr;
enum format format = DEFAULT_FORMAT;
enum input input = DEFAULT_INPUT;
err_set_progname(argv[0]);
jsmn_init(&parser);
opt_set_alloc(opt_allocfn, tal_reallocfn, tal_freefn);
configdir_register_opts(ctx, &lightning_dir, &rpc_filename);
opt_register_noarg("--help|-h", opt_usage_and_exit,
"<command> [<params>...]", "Show this message. Use the command help (without hyphens -- \"lightning-cli help\") to get a list of all RPC commands");
opt_register_noarg("-H|--human-readable", opt_set_human, &format,
"Human-readable output (default for 'help')");
opt_register_noarg("-J|--json", opt_set_json, &format,
"JSON output (default unless 'help')");
opt_register_noarg("-k|--keywords", opt_set_keywords, &input,
"Use format key=value for <params>");
opt_register_noarg("-o|--order", opt_set_ordered, &input,
"Use params in order for <params>");
opt_register_version();
opt_early_parse(argc, argv, opt_log_stderr_exit);
opt_parse(&argc, argv, opt_log_stderr_exit);
method = argv[1];
if (!method) {
char *usage = opt_usage(argv[0], NULL);
printf("%s\n", usage);
tal_free(usage);
printf("Querying lightningd for available RPC commands (\"lightning-cli help\"):\n\n");
method = "help";
}
if (format == DEFAULT_FORMAT) {
if (streq(method, "help"))
format = HUMAN;
else
format = JSON;
}
if (chdir(lightning_dir) != 0)
err(ERROR_TALKING_TO_LIGHTNINGD, "Moving into '%s'",
lightning_dir);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (strlen(rpc_filename) + 1 > sizeof(addr.sun_path))
errx(ERROR_USAGE, "rpc filename '%s' too long", rpc_filename);
strcpy(addr.sun_path, rpc_filename);
addr.sun_family = AF_UNIX;
if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) != 0)
err(ERROR_TALKING_TO_LIGHTNINGD,
"Connecting to '%s'", rpc_filename);
idstr = tal_fmt(ctx, "lightning-cli-%i", getpid());
cmd = tal_fmt(ctx,
"{ \"method\" : \"%s\", \"id\" : \"%s\", \"params\" : ",
method, idstr);
if (input == DEFAULT_INPUT) {
/* Hacky autodetect; only matters if more than single arg */
if (argc > 2 && strchr(argv[2], '='))
input = KEYWORDS;
else
input = ORDERED;
}
if (input == KEYWORDS) {
tal_append_fmt(&cmd, "{ ");
for (i = 2; i < argc; i++) {
const char *eq = strchr(argv[i], '=');
if (!eq)
err(ERROR_USAGE, "Expected key=value in '%s'",
argv[i]);
tal_append_fmt(&cmd, "\"%.*s\" : ",
(int)(eq - argv[i]), argv[i]);
add_input(&cmd, eq + 1, i, argc);
}
tal_append_fmt(&cmd, "} }");
} else {
tal_append_fmt(&cmd, "[ ");
for (i = 2; i < argc; i++)
add_input(&cmd, argv[i], i, argc);
tal_append_fmt(&cmd, "] }");
}
if (!write_all(fd, cmd, strlen(cmd)))
err(ERROR_TALKING_TO_LIGHTNINGD, "Writing command");
/* Start with 1000 characters, 100 tokens. */
resp = tal_arr(ctx, char, 1000);
toks = tal_arr(ctx, jsmntok_t, 100);
off = 0;
parserr = 0;
while (parserr <= 0) {
/* Read more if parser says, or we have 0 tokens. */
if (parserr == 0 || parserr == JSMN_ERROR_PART) {
i = read(fd, resp + off, tal_count(resp) - 1 - off);
if (i <= 0)
err(ERROR_TALKING_TO_LIGHTNINGD,
"reading response");
off += i;
/* NUL terminate */
resp[off] = '\0';
}
/* (Continue) parsing */
parserr = jsmn_parse(&parser, resp, off, toks, tal_count(toks));
switch (parserr) {
case JSMN_ERROR_INVAL:
errx(ERROR_TALKING_TO_LIGHTNINGD,
"Malformed response '%s'", resp);
case JSMN_ERROR_NOMEM:
/* Need more tokens, double it */
tal_resize(&toks, tal_count(toks) * 2);
break;
case JSMN_ERROR_PART:
/* Need more data: make room if necessary */
if (off == tal_count(resp) - 1)
tal_resize(&resp, tal_count(resp) * 2);
break;
}
}
if (toks->type != JSMN_OBJECT)
errx(ERROR_TALKING_TO_LIGHTNINGD,
"Non-object response '%s'", resp);
result = json_get_member(resp, toks, "result");
error = json_get_member(resp, toks, "error");
if (!error && !result)
errx(ERROR_TALKING_TO_LIGHTNINGD,
"Either 'result' or 'error' must be returned in response '%s'", resp);
id = json_get_member(resp, toks, "id");
if (!id)
errx(ERROR_TALKING_TO_LIGHTNINGD,
"Missing 'id' in response '%s'", resp);
if (!json_tok_streq(resp, id, idstr))
errx(ERROR_TALKING_TO_LIGHTNINGD,
"Incorrect 'id' in response: %.*s",
json_tok_len(id), json_tok_contents(resp, id));
if (!error || json_tok_is_null(resp, error)) {
if (format == HUMAN)
if (streq(method, "help")) human_help(resp, result);
else human_readable(resp, result, '\n');
else
printf("%.*s\n",
json_tok_len(result),
json_tok_contents(resp, result));
tal_free(lightning_dir);
tal_free(rpc_filename);
tal_free(ctx);
opt_free_table();
return 0;
}
printf("%.*s\n",
json_tok_len(error), json_tok_contents(resp, error));
tal_free(lightning_dir);
tal_free(rpc_filename);
tal_free(ctx);
opt_free_table();
return 1;
}