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cli: don't crash when there's no argument

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This should provide the default help message and exit, but was
resulting in a segmentation fault from freeing pointers passed to
the default config.

Changelog-Fixed: lightning-cli properly returns help without argument
This commit is contained in:
Alex Myers 2023-08-09 12:10:44 -05:00 • committed by Rusty Russell
parent 5531c9d460
commit bd4a001279
4 changed files with 14 additions and 7 deletions
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5
cli/lightning-cli.c
View file

@ -650,7 +650,7 @@ int main(int argc, char *argv[])
jsmntok_t *toks;
const jsmntok_t *result, *error, *id;
const tal_t *ctx = tal(NULL, char);
char *net_dir, *rpc_filename;
char *config_filename, *base_dir, *net_dir, *rpc_filename;
jsmn_parser parser;
int parserr;
enum format format = DEFAULT_FORMAT;
@ -668,7 +668,8 @@ int main(int argc, char *argv[])
setup_option_allocators();
opt_exitcode = ERROR_USAGE;
minimal_config_opts(ctx, argc, argv, &net_dir, &rpc_filename);
minimal_config_opts(ctx, argc, argv, &config_filename, &base_dir,
&net_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");

10
common/configdir.c
View file

@ -281,16 +281,18 @@ static struct configvar **gather_cmdline_args(const tal_t *ctx,
void minimal_config_opts(const tal_t *ctx,
int argc, char *argv[],
char **config_filename,
char **basedir,
char **config_netdir,
char **rpc_filename)
{
char *unused_filename, *unused_basedir;
initial_config_opts(tmpctx, &argc, argv, false,
&unused_filename,
&unused_basedir,
config_filename,
basedir,
config_netdir,
rpc_filename);
tal_steal(ctx, *config_filename);
tal_steal(ctx, *basedir);
tal_steal(ctx, *config_netdir);
tal_steal(ctx, *rpc_filename);
}

2
common/configdir.h
View file

@ -15,6 +15,8 @@ void setup_option_allocators(void);
/* Minimal config parsing for tools: use opt_early_parse/opt_parse after */
void minimal_config_opts(const tal_t *ctx,
int argc, char *argv[],
char **config_filename,
char **basedir,
char **config_netdir,
char **rpc_filename);

4
devtools/checkchannels.c
View file

@ -109,6 +109,7 @@ static void copy_column(void *dst, size_t size,
int main(int argc, char *argv[])
{
char *config_filename, *base_dir;
char *net_dir, *rpc_filename, *hsmfile, *dbfile;
sqlite3 *sql;
sqlite3_stmt *stmt;
@ -124,7 +125,8 @@ int main(int argc, char *argv[])
setup_option_allocators();
minimal_config_opts(top_ctx, argc, argv, &net_dir, &rpc_filename);
minimal_config_opts(top_ctx, argc, argv, &config_filename, &base_dir,
&net_dir, &rpc_filename);
opt_register_noarg("-v|--verbose", opt_set_bool, &verbose,
"Print everything");