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Support previous protocol version in chronyc

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This adds compatibility with chronyd using the previous protocol version
(chrony versions 1.27, 1.28, 1.29).
This commit is contained in:
Miroslav Lichvar 2014-01-24 15:49:18 +01:00
parent dba458d50c
commit d537ed11fd
1 changed files with 16 additions and 2 deletions
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18
client.c
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@ -1242,6 +1242,7 @@ static unsigned long token = 0;
static int max_retries = 2;
static int initial_timeout = 1000;
static int proto_version = PROTO_VERSION_NUMBER;
/* This is the core protocol module. Complete particular fields in
the outgoing packet, send it, wait for a response, handle retries,
@ -1267,7 +1268,6 @@ submit_request(CMD_Request *request, CMD_Reply *reply, int *reply_auth_ok)
int n_attempts;
fd_set rdfd, wrfd, exfd;
request->version = PROTO_VERSION_NUMBER;
request->pkt_type = PKT_TYPE_CMD_REQUEST;
request->res1 = 0;
request->res2 = 0;
@ -1282,6 +1282,7 @@ submit_request(CMD_Request *request, CMD_Reply *reply, int *reply_auth_ok)
n_attempts = 0;
do {
request->version = proto_version;
command_length = PKL_CommandLength(request);
padding_length = PKL_CommandPaddingLength(request);
assert(command_length > 0 && command_length > padding_length);
@ -1404,7 +1405,7 @@ submit_request(CMD_Request *request, CMD_Reply *reply, int *reply_auth_ok)
continue;
}
bad_header = ((reply->version != PROTO_VERSION_NUMBER &&
bad_header = ((reply->version != proto_version &&
!(reply->version >= PROTO_VERSION_MISMATCH_COMPAT_CLIENT &&
ntohs(reply->status) == STT_BADPKTVERSION)) ||
(reply->pkt_type != PKT_TYPE_CMD_REPLY) ||
@ -1420,6 +1421,19 @@ submit_request(CMD_Request *request, CMD_Reply *reply, int *reply_auth_ok)
continue;
}
#if PROTO_VERSION_NUMBER == 6
/* Protocol version 5 is similar to 6 except there is no padding.
If a version 5 reply with STT_BADPKTVERSION is received,
switch our version and try again. */
if (proto_version == PROTO_VERSION_NUMBER &&
reply->version == PROTO_VERSION_NUMBER - 1) {
proto_version = PROTO_VERSION_NUMBER - 1;
continue;
}
#else
#error unknown compatibility with PROTO_VERSION - 1
#endif
/* Good packet received, print out results */
#if 0
printf("Reply cmd=%d reply=%d stat=%d num=%d tot=%d seq=%d utok=%08lx tok=%d\n",