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Handle more errnos from accept() without closing the connection. This may fix a bug that could close OR listeners when (a) TCP connections were hung up before accept() could be called, or (b) during FD exhaustion.

Browse Source 
svn:r2579
This commit is contained in:
Nick Mathewson 2004-10-24 00:55:18 +00:00
parent 78a2c3aa39
commit 5d53828c57
2 changed files with 18 additions and 2 deletions
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10
src/common/util.h
View File

@ -269,12 +269,22 @@ int parse_addr_and_port_range(const char *s, uint32_t *addr_out,
/** Return true if e is EINPROGRESS or the local equivalent as returned by
* a call to connect(). */
#define ERRNO_IS_CONN_EINPROGRESS(e) ((e) == WSAEINPROGRESS || (e)== WSAEINVAL)
/** Return true if e is EAGAIN or another error indicating that a call to
* accept() has no pending connections to return. */
#define ERRNO_IS_ACCEPT_EAGAIN(e) ERRNO_IS_EAGAIN(e)
/** Return true if e is EMFILE or another error indicating that a call to
* accept() has failed because we're out of fds or something. */
#define ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e) \
((e) == WSAEMFILE || (e) == WSAENOBUFS)
int tor_socket_errno(int sock);
const char *tor_socket_strerror(int e);
#else
#define ERRNO_IS_EAGAIN(e) ((e) == EAGAIN)
#define ERRNO_IS_EINPROGRESS(e) ((e) == EINPROGRESS)
#define ERRNO_IS_CONN_EINPROGRESS(e) ((e) == EINPROGRESS)
#define ERRNO_IS_ACCEPT_EAGAIN(e) ((e) == EAGAIN || (e) == ECONNABORTED)
#define ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e) \
((e) == EMFILE || (e) == ENFILE || (e) == ENOBUFS || (e) == ENOMEM)
#define tor_socket_errno(sock) (errno)
#define tor_socket_strerror(e) strerror(e)
#endif

10
src/or/connection.c
View File

@ -385,11 +385,17 @@ static int connection_handle_listener_read(connection_t *conn, int new_type) {
news = accept(conn->s,(struct sockaddr *)&remote,&remotelen);
if (news == -1) { /* accept() error */
if(ERRNO_IS_EAGAIN(tor_socket_errno(conn->s))) {
int e = tor_socket_errno(conn->s);
if (ERRNO_IS_ACCEPT_EAGAIN(e)) {
return 0; /* he hung up before we could accept(). that's fine. */
} else if (ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e)) {
log_fn(LOG_WARN,"accept failed: %s. Dropping incomming connection.",
tor_socket_strerror(e));
return 0;
}
/* else there was a real error. */
log_fn(LOG_WARN,"accept() failed. Closing listener.");
log_fn(LOG_WARN,"accept() failed: %s. Closing listener.",
tor_socket_strerror(e));
connection_mark_for_close(conn);
return -1;
}