128 lines
3.4 KiB
Diff
128 lines
3.4 KiB
Diff
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From 51634fd77c836e3cb5acd9b9b72e7ede20321d56 Mon Sep 17 00:00:00 2001
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From: Patrick Venture <venture@google.com>
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Date: Tue, 4 Dec 2018 16:47:09 -0800
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Subject: [PATCH] open: checking received msg id against expectation
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Check the received IPMI response message id against
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the id expected given the IPMI request. They need to
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match. It is possible that request A times out,
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request B is sent, and then request A responds to the
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request B. The value for request B may be behind it
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in the queue.
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Note: This may only be possible if the file is kept
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open between multiple IPMI messages (a common
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occurrence).
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Resolves: #82
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Signed-off-by: Patrick Venture <venture@google.com>
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---
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src/plugins/open/open.c | 83 ++++++++++++++++++++++++-----------------
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1 file changed, 48 insertions(+), 35 deletions(-)
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diff --git a/src/plugins/open/open.c b/src/plugins/open/open.c
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index 4fdabeb..8761a6d 100644
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--- a/src/plugins/open/open.c
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+++ b/src/plugins/open/open.c
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@@ -342,48 +342,61 @@ ipmi_openipmi_send_cmd(struct ipmi_intf *intf, struct ipmi_rq *req)
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read_timeout.tv_sec = IPMI_OPENIPMI_READ_TIMEOUT;
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read_timeout.tv_usec = 0;
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do {
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- retval = select(intf->fd + 1, &rset, NULL, NULL, &read_timeout);
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- } while (retval < 0 && errno == EINTR);
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- if (retval < 0) {
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- lperror(LOG_ERR, "I/O Error");
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- if (data) {
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- free(data);
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- data = NULL;
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- }
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- return NULL;
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- } else if (retval == 0) {
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- lprintf(LOG_ERR, "No data available");
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- if (data) {
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- free(data);
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- data = NULL;
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- }
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- return NULL;
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- }
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- if (FD_ISSET(intf->fd, &rset) == 0) {
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- lprintf(LOG_ERR, "No data available");
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- if (data) {
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- free(data);
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- data = NULL;
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+ do {
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+ retval = select(intf->fd + 1, &rset, NULL, NULL, &read_timeout);
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+ } while (retval < 0 && errno == EINTR);
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+ if (retval < 0) {
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+ lperror(LOG_ERR, "I/O Error");
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+ if (data) {
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+ free(data);
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+ data = NULL;
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+ }
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+ return NULL;
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+ } else if (retval == 0) {
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+ lprintf(LOG_ERR, "No data available");
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+ if (data) {
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+ free(data);
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+ data = NULL;
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+ }
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+ return NULL;
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}
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- return NULL;
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- }
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-
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- recv.addr = (unsigned char *)&addr;
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- recv.addr_len = sizeof(addr);
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- recv.msg.data = rsp.data;
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- recv.msg.data_len = sizeof(rsp.data);
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-
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- /* get data */
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- if (ioctl(intf->fd, IPMICTL_RECEIVE_MSG_TRUNC, &recv) < 0) {
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- lperror(LOG_ERR, "Error receiving message");
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- if (errno != EMSGSIZE) {
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+ if (FD_ISSET(intf->fd, &rset) == 0) {
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+ lprintf(LOG_ERR, "No data available");
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if (data) {
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free(data);
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data = NULL;
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}
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return NULL;
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}
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- }
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+
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+ recv.addr = (unsigned char *)&addr;
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+ recv.addr_len = sizeof(addr);
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+ recv.msg.data = rsp.data;
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+ recv.msg.data_len = sizeof(rsp.data);
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+
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+ /* get data */
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+ if (ioctl(intf->fd, IPMICTL_RECEIVE_MSG_TRUNC, &recv) < 0) {
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+ lperror(LOG_ERR, "Error receiving message");
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+ if (errno != EMSGSIZE) {
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+ if (data) {
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+ free(data);
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+ data = NULL;
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+ }
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+ return NULL;
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+ }
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+ }
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+
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+ /* If the message received wasn't expected, try to grab the
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+ * next message until it's out of messages. -EAGAIN is
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+ * returned if the list empty, but basically if it returns a
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+ * message, check if it's alright.
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+ */
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+ if (_req.msgid != recv.msgid) {
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+ lprintf(LOG_NOTICE,
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+ "Received a response with unexpected ID %ld vs. %ld",
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+ recv.msgid, _req.msgid);
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+ }
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+ } while (_req.msgid != recv.msgid);
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if (verbose > 4) {
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fprintf(stderr, "Got message:");
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--
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2.40.1
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