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Make evconnlistener work around bug in older Linux when getting nmapped

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Older Linuxes sometimes respond to some nmap probes by having accept()
return a success but with socklen 0.  That can lead to confusing behavior
when you go to process the sockaddr.
This commit is contained in:
Nick Mathewson 2012-01-09 11:49:41 -05:00
parent f032516718
commit ecfc720a4f
1 changed files with 6 additions and 0 deletions
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6
listener.c
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@ -390,6 +390,12 @@ listener_read_cb(evutil_socket_t fd, short what, void *p)
evutil_socket_t new_fd = accept(fd, (struct sockaddr*)&ss, &socklen); evutil_socket_t new_fd = accept(fd, (struct sockaddr*)&ss, &socklen);
if (new_fd < 0) if (new_fd < 0)
break; break;
if (socklen == 0) {
/* This can happen with some older linux kernels in
* response to nmap. */
evutil_closesocket(new_fd);
continue;
}
if (!(lev->flags & LEV_OPT_LEAVE_SOCKETS_BLOCKING)) if (!(lev->flags & LEV_OPT_LEAVE_SOCKETS_BLOCKING))
evutil_make_socket_nonblocking(new_fd); evutil_make_socket_nonblocking(new_fd);