- if (group_writestring(g, x, (char *)buf_u, sizeof(buf_u)))
- return ("<failed>");
- return ((const char *)buf_u);
+ uint32 qbit;
+ uint32 n;
+
+ if (q < s->seq) {
+ a_warn(service, "replay", "old-sequence", A_END);
+ return (-1);
+ }
+ if (q >= s->seq + SEQ_WINSZ) {
+ n = q - (s->seq + SEQ_WINSZ - 1);
+ if (n < SEQ_WINSZ)
+ s->win >>= n;
+ else
+ s->win = 0;
+ s->seq += n;
+ }
+ qbit = 1 << (q - s->seq);
+ if (s->win & qbit) {
+ a_warn(service, "replay", "duplicated-sequence", A_END);
+ return (-1);
+ }
+ s->win |= qbit;
+ return (0);