This makes a number of changes to improve error reporting while connecting
a new spliced socket:
* We use flow_err() and similar functions so all messages include info
on which specific flow was affected
* We use strerror() to interpret raw error values
* We now report errors on connection (at "trace" level, since this would
allow spamming the logs)
* We also look up and report some details on EPOLLERR events, which can
include connection errors, since we use a non-blocking connect(). Again
we use "trace" level since this can spam the logs.
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
tcp_splice.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/tcp_splice.c b/tcp_splice.c
index 5ba9c8ea..49075e5c 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -349,8 +349,9 @@ static int tcp_splice_connect(const struct ctx *c, struct
tcp_splice_conn *conn,
ASSERT(0);
if (conn->s[1] < 0) {
- warn("Couldn't open connectable socket for splice (%d)",
- conn->s[1]);
+ flow_err(conn,
+ "Couldn't open connectable socket for splice: %s",
+ strerror(-conn->s[1]));
return conn->s[1];
}
@@ -369,8 +370,11 @@ static int tcp_splice_connect(const struct ctx *c, struct
tcp_splice_conn *conn,
}
if (connect(conn->s[1], sa, sl)) {
- if (errno != EINPROGRESS)
+ if (errno != EINPROGRESS) {
+ flow_trace(conn, "Couldn't connect socket for splice: %s",
+ strerror(errno));
return -errno;
+ }
conn_event(c, conn, SPLICE_CONNECT);
} else {
conn_event(c, conn, SPLICE_ESTABLISHED);
@@ -457,8 +461,20 @@ void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
if (conn->events == SPLICE_CLOSED)
return;
- if (events & EPOLLERR)
+ if (events & EPOLLERR) {
+ int err, rc;
+ socklen_t sl = sizeof(err);
+
+ rc = getsockopt(ref.fd, SOL_SOCKET, SO_ERROR, &err, &sl);
+ if (rc)
+ flow_err(conn, "Error retrieving SO_ERROR: %s",
+ strerror(errno));
+ else
+ flow_trace(conn, "Error event on socket: %s",
+ strerror(err));
+
goto close;
+ }
if (conn->events == SPLICE_CONNECT) {
if (!(events & EPOLLOUT))
--
2.43.0