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94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
#include <ccan/mem/mem.h>
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#include <ccan/tal/str/str.h>
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#include <common/type_to_string.h>
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#include <common/utils.h>
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#include <common/wire_error.h>
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#include <wire/gen_peer_wire.h>
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u8 *towire_errorfmtv(const tal_t *ctx,
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const struct channel_id *channel,
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const char *fmt,
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va_list ap)
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{
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/* BOLT #1:
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*
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* The channel is referred to by `channel_id` unless `channel_id` is
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* zero (ie. all bytes zero), in which case it refers to all
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* channels. */
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static const struct channel_id all_channels;
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char *estr;
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u8 *msg;
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estr = tal_vfmt(ctx, fmt, ap);
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/* We need tal_len to work, so we use copy. */
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msg = towire_error(ctx, channel ? channel : &all_channels,
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(u8 *)tal_dup_arr(estr, char, estr, strlen(estr), 0));
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tal_free(estr);
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va_end(ap);
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return msg;
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}
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u8 *towire_errorfmt(const tal_t *ctx,
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const struct channel_id *channel,
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const char *fmt, ...)
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{
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va_list ap;
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u8 *msg;
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va_start(ap, fmt);
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msg = towire_errorfmtv(ctx, channel, fmt, ap);
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va_end(ap);
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return msg;
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}
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bool is_all_channels(const struct channel_id *channel_id)
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{
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/* BOLT #1:
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*
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* A node receiving `error` MUST fail the channel referred to by the
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* message, or if `channel_id` is zero, it MUST fail all channels and
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* MUST close the connection. If no existing channel is referred to
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* by the message, the receiver MUST ignore the message.
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*/
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return memeqzero(channel_id, sizeof(*channel_id));
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}
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char *sanitize_error(const tal_t *ctx, const u8 *errmsg,
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struct channel_id *channel_id)
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{
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struct channel_id dummy;
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u8 *data;
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size_t i;
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if (!channel_id)
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channel_id = &dummy;
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if (!fromwire_error(ctx, errmsg, NULL, channel_id, &data))
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return tal_fmt(ctx, "Invalid ERROR message '%s'",
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tal_hex(ctx, errmsg));
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/* BOLT #1:
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*
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* A receiving node SHOULD only print out `data` verbatim if the
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* string is composed solely of printable ASCII characters. For
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* reference, the printable character set includes byte values 32
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* through 127 inclusive.
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*/
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for (i = 0; i < tal_len(data); i++) {
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if (data[i] < 32 || data[i] > 127) {
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/* Convert to hex, minus NUL term */
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data = (u8 *)tal_hex(ctx, data);
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tal_resize(&data, tal_len(data)-1);
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break;
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}
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}
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return tal_fmt(ctx, "channel %s: %.*s",
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is_all_channels(channel_id)
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? "ALL"
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: type_to_string(ctx, struct channel_id, channel_id),
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(int)tal_len(data), (char *)data);
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}
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