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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
#include <common/ping.h>
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#include <common/status.h>
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#include <common/version.h>
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#include <wire/gen_peer_wire.h>
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bool check_ping_make_pong(const tal_t *ctx, const u8 *ping, u8 **pong)
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{
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u16 num_pong_bytes;
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u8 *ignored;
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if (!fromwire_ping(ctx, ping, &num_pong_bytes, &ignored))
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return false;
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tal_free(ignored);
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/* FIXME: */
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/* BOLT #1:
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*
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* A node receiving a `ping` message SHOULD fail the channels if it
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* has received significantly in excess of one `ping` per 30 seconds,
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*/
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/* BOLT #1:
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*
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* ... otherwise if `num_pong_bytes` is less than 65532 it MUST
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* respond by sending a `pong` message with `byteslen` equal to
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* `num_pong_bytes`, otherwise it MUST ignore the `ping`.
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*/
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if (num_pong_bytes < 65532) {
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/* BOLT #1:
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*
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* A node sending `pong` or `ping` SHOULD set `ignored` to
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* zeroes, but MUST NOT set `ignored` to sensitive data such
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* as secrets, or portions of initialized memory.
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*/
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ignored = tal_arrz(ctx, u8, num_pong_bytes);
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#if DEVELOPER
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/* Embed version */
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strncpy((char *)ignored, version(), num_pong_bytes);
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#endif
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*pong = towire_pong(ctx, ignored);
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tal_free(ignored);
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} else
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*pong = NULL;
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return true;
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}
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u8 *make_ping(const tal_t *ctx, u16 num_pong_bytes, u16 padlen)
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{
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/* BOLT #1:
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*
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* A node sending `pong` or `ping` SHOULD set `ignored` to zeroes, but
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* MUST NOT set `ignored` to sensitive data such as secrets, or
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* portions of initialized memory.
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*/
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u8 *ping, *ignored = tal_arrz(ctx, u8, padlen);
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ping = towire_ping(ctx, num_pong_bytes, ignored);
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tal_free(ignored);
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return ping;
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}
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const char *got_pong(const u8 *pong, size_t *num_pings_outstanding)
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{
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u8 *ignored;
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int i;
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if (!fromwire_pong(pong, pong, &ignored))
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return "Bad pong";
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if (*num_pings_outstanding == 0)
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return "Unexpected pong";
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for (i = 0; i < tal_len(ignored); i++) {
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if (ignored[i] < ' ' || ignored[i] == 127)
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break;
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}
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status_trace("Got pong %zu bytes (%.*s...)",
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tal_len(ignored), i, (char *)ignored);
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(*num_pings_outstanding)--;
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return NULL;
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}
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