Another hack for SO_LINGER in Linux. - geomyidae - A small C-based gopherd.
HTML git clone git://bitreich.org/geomyidae/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/geomyidae/
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---
DIR commit 1908f14b2d4df2a0530fc4c7ca308220c89871c0
DIR parent 2c95cfddd2b4d2aca43bdcad09cdadd3214a10c9
HTML Author: Christoph Lohmann <20h@r-36.net>
Date: Sun, 18 Feb 2018 09:33:39 +0100
Another hack for SO_LINGER in Linux.
In case some connection stalled, wait 30 seconds until it is closed.
DDoS is still possible, but that is not geomyidae's fault.
Diffstat:
M ind.c | 40 ++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 4 deletions(-)
---
DIR diff --git a/ind.c b/ind.c
@@ -57,12 +57,22 @@ filetype type[] = {
int
pendingbytes(int sock)
{
- int pending;
+ int pending, rval;
pending = 0;
+ rval = 0;
#ifdef TIOCOUTQ
- ioctl(sock, TIOCOUTQ, &pending);
+ rval = ioctl(sock, TIOCOUTQ, &pending);
+#else
+#ifdef SIOCOUTQ
+ rval = ioctl(sock, SIOCOUTQ, &pending);
#endif
+#endif
+
+ if (rval != 0) {
+ printf("rval = %d\n", rval);
+ return 0;
+ }
return pending;
}
@@ -70,8 +80,30 @@ pendingbytes(int sock)
void
waitforpendingbytes(int sock)
{
- while (pendingbytes(sock) > 0)
- usleep(10);
+ int npending, opending, tries;
+
+ npending = opending = tries = 0;
+
+ /*
+ * Wait until there is nothing pending or the connection stalled for
+ * 30 seconds.
+ */
+ while ((npending = pendingbytes(sock)) > 0 && tries < 30000000) {
+ if (opending != 0) {
+ if (opending != npending) {
+ tries = 0;
+ } else {
+ if (tries == 0) {
+ tries = 1;
+ } else {
+ tries += tries;
+ }
+ }
+ }
+ opending = npending;
+
+ usleep(tries);
+ }
}
int