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Comments/explanation for #17873

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rl1987 2018-05-16 17:16:46 +02:00 committed by Nick Mathewson
parent 74a474a2e7
commit 9f5431c79f
1 changed files with 19 additions and 0 deletions
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19
src/core/mainloop/connection.c
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@ -133,6 +133,22 @@
#include "feature/nodelist/routerinfo_st.h"
#include "core/or/socks_request_st.h"
/**
* On Windows and Linux we cannot reliably bind() a socket to an
* address and port if: 1) There's already a socket bound to wildcard
* address (0.0.0.0 or ::) with the same port; 2) We try to bind()
* to wildcard address and there's another socket bound to a
* specific address and the same port.
*
* To address this problem on these two platforms we implement a
* routine that:
* 1) Checks if first attempt to bind() a new socket failed with
* EADDRINUSE.
* 2) If so, it will close the appropriate old listener connection and
* 3) Attempts bind()'ing the new listener socket again.
*
* For further information, see ticket #17873.
*/
#if defined(__linux__) || defined(_WIN32)
#define ENABLE_LISTENER_REBIND
#endif
@ -1191,6 +1207,9 @@ tor_listen(tor_socket_t fd)
*
* <b>address</b> is only used for logging purposes and to add the information
* to the conn.
*
* Set <b>addr_in_use</b> to true in case socket binding fails with
* EADDRINUSE.
*/
static connection_t *
connection_listener_new(const struct sockaddr *listensockaddr,