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#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#include <common/wire_error.h>
#include <wire/peer_wire.h>
u8 *towire_errorfmtv(const tal_t *ctx,
const struct channel_id *channel,
const char *fmt,
va_list ap)
{
/* BOLT #1:
*
* The channel is referred to by `channel_id`, unless `channel_id` is
* 0 (i.e. all bytes are 0), in which case it refers to all
* channels. */
static const struct channel_id all_channels;
char *estr;
u8 *msg;
estr = tal_vfmt(ctx, fmt, ap);
/* We need tal_len to work, so we use copy. */
msg = towire_error(ctx, channel ? channel : &all_channels,
(u8 *)tal_dup_arr(estr, char, estr, strlen(estr), 0));
tal_free(estr);
return msg;
}
u8 *towire_errorfmt(const tal_t *ctx,
const struct channel_id *channel,
const char *fmt, ...)
{
va_list ap;
u8 *msg;
va_start(ap, fmt);
msg = towire_errorfmtv(ctx, channel, fmt, ap);
va_end(ap);
return msg;
}
bool channel_id_is_all(const struct channel_id *channel_id)
{
return memeqzero(channel_id, sizeof(*channel_id));
}
char *sanitize_error(const tal_t *ctx, const u8 *errmsg,
struct channel_id *channel_id)
{
struct channel_id dummy;
u8 *data;
size_t i;
if (!channel_id)
channel_id = &dummy;
if (!fromwire_error(ctx, errmsg, channel_id, &data))
return tal_fmt(ctx, "Invalid ERROR message '%s'",
tal_hex(ctx, errmsg));
/* BOLT #1:
*
* The receiving node:
*...
* - if `data` is not composed solely of printable ASCII characters
* (For reference: the printable character set includes byte values 32
* through 126, inclusive):
* - SHOULD NOT print out `data` verbatim.
*/
for (i = 0; i < tal_count(data); i++) {
if (data[i] < 32 || data[i] > 127) {
/* Convert to hex, minus NUL term */
data = (u8 *)tal_hex(ctx, data);
tal_resize(&data, strlen((const char *)data));
break;
}
}
return tal_fmt(ctx, "channel %s: %.*s",
channel_id_is_all(channel_id)
? "ALL"
: type_to_string(ctx, struct channel_id, channel_id),
(int)tal_count(data), (char *)data);
}