-int metakey_h(connection_t *c)
-{
- char buffer[MAX_STRING_SIZE];
- int cipher, digest, maclength, compression;
- int len;
-
- cp();
-
- if(sscanf
- (c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength,
- &compression, buffer) != 5) {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
- c->hostname);
- return -1;
+static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
+
+ if(type == 128)
+ return true;
+
+ if(type == 1 && c->status.invitation_used)
+ return finalize_invitation(mesh, c, data, len);
+
+ if(type != 0 || len != 18 || c->status.invitation_used)
+ return false;
+
+ // Recover the filename from the cookie and the key
+ char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
+ char hash[64];
+ char hashbuf[18 + strlen(fingerprint)];
+ char cookie[25];
+ memcpy(hashbuf, data, 18);
+ memcpy(hashbuf + 18, fingerprint, sizeof hashbuf - 18);
+ sha512(hashbuf, sizeof hashbuf, hash);
+ b64encode_urlsafe(hash, cookie, 18);
+ free(fingerprint);
+
+ char filename[PATH_MAX], usedname[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookie);
+ snprintf(usedname, sizeof usedname, "%s" SLASH "invitations" SLASH "%s.used", mesh->confbase, cookie);
+
+ // Atomically rename the invitation file
+ if(rename(filename, usedname)) {
+ if(errno == ENOENT)
+ logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
+ else
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
+ return false;