diff options
Diffstat (limited to 'nbd/client.c')
| -rw-r--r-- | nbd/client.c | 63 |
1 files changed, 33 insertions, 30 deletions
diff --git a/nbd/client.c b/nbd/client.c index a9d8d32..b9dc829 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016-2018 Red Hat, Inc. + * Copyright (C) 2016-2019 Red Hat, Inc. * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> * * Network Block Device Client Side @@ -142,17 +142,18 @@ static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt, return 0; } -/* If reply represents success, return 1 without further action. - * If reply represents an error, consume the optional payload of - * the packet on ioc. Then return 0 for unsupported (so the client - * can fall back to other approaches), or -1 with errp set for other - * errors. +/* + * If reply represents success, return 1 without further action. If + * reply represents an error, consume the optional payload of the + * packet on ioc. Then return 0 for unsupported (so the client can + * fall back to other approaches), where @strict determines if only + * ERR_UNSUP or all errors fit that category, or -1 with errp set for + * other errors. */ static int nbd_handle_reply_err(QIOChannel *ioc, NBDOptionReply *reply, - Error **errp) + bool strict, Error **errp) { - char *msg = NULL; - int result = -1; + g_autofree char *msg = NULL; if (!(reply->type & (1 << 31))) { return 1; @@ -163,26 +164,28 @@ static int nbd_handle_reply_err(QIOChannel *ioc, NBDOptionReply *reply, error_setg(errp, "server error %" PRIu32 " (%s) message is too long", reply->type, nbd_rep_lookup(reply->type)); - goto cleanup; + goto err; } msg = g_malloc(reply->length + 1); if (nbd_read(ioc, msg, reply->length, NULL, errp) < 0) { error_prepend(errp, "Failed to read option error %" PRIu32 " (%s) message: ", reply->type, nbd_rep_lookup(reply->type)); - goto cleanup; + goto err; } msg[reply->length] = '\0'; trace_nbd_server_error_msg(reply->type, nbd_reply_type_lookup(reply->type), msg); } - switch (reply->type) { - case NBD_REP_ERR_UNSUP: - trace_nbd_reply_err_unsup(reply->option, nbd_opt_lookup(reply->option)); - result = 0; - goto cleanup; + if (reply->type == NBD_REP_ERR_UNSUP || !strict) { + trace_nbd_reply_err_ignored(reply->option, + nbd_opt_lookup(reply->option), + reply->type, nbd_rep_lookup(reply->type)); + return 0; + } + switch (reply->type) { case NBD_REP_ERR_POLICY: error_setg(errp, "Denied by server for option %" PRIu32 " (%s)", reply->option, nbd_opt_lookup(reply->option)); @@ -227,12 +230,9 @@ static int nbd_handle_reply_err(QIOChannel *ioc, NBDOptionReply *reply, error_append_hint(errp, "server reported: %s\n", msg); } - cleanup: - g_free(msg); - if (result < 0) { - nbd_send_opt_abort(ioc); - } - return result; + err: + nbd_send_opt_abort(ioc); + return -1; } /* nbd_receive_list: @@ -257,7 +257,7 @@ static int nbd_receive_list(QIOChannel *ioc, char **name, char **description, if (nbd_receive_option_reply(ioc, NBD_OPT_LIST, &reply, errp) < 0) { return -1; } - error = nbd_handle_reply_err(ioc, &reply, errp); + error = nbd_handle_reply_err(ioc, &reply, true, errp); if (error <= 0) { return error; } @@ -363,7 +363,7 @@ static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t opt, if (nbd_receive_option_reply(ioc, opt, &reply, errp) < 0) { return -1; } - error = nbd_handle_reply_err(ioc, &reply, errp); + error = nbd_handle_reply_err(ioc, &reply, true, errp); if (error <= 0) { return error; } @@ -538,12 +538,15 @@ static int nbd_receive_query_exports(QIOChannel *ioc, } } -/* nbd_request_simple_option: Send an option request, and parse the reply +/* + * nbd_request_simple_option: Send an option request, and parse the reply. + * @strict controls whether ERR_UNSUP or all errors produce 0 status. * return 1 for successful negotiation, * 0 if operation is unsupported, * -1 with errp set for any other error */ -static int nbd_request_simple_option(QIOChannel *ioc, int opt, Error **errp) +static int nbd_request_simple_option(QIOChannel *ioc, int opt, bool strict, + Error **errp) { NBDOptionReply reply; int error; @@ -555,7 +558,7 @@ static int nbd_request_simple_option(QIOChannel *ioc, int opt, Error **errp) if (nbd_receive_option_reply(ioc, opt, &reply, errp) < 0) { return -1; } - error = nbd_handle_reply_err(ioc, &reply, errp); + error = nbd_handle_reply_err(ioc, &reply, strict, errp); if (error <= 0) { return error; } @@ -587,7 +590,7 @@ static QIOChannel *nbd_receive_starttls(QIOChannel *ioc, QIOChannelTLS *tioc; struct NBDTLSHandshakeData data = { 0 }; - ret = nbd_request_simple_option(ioc, NBD_OPT_STARTTLS, errp); + ret = nbd_request_simple_option(ioc, NBD_OPT_STARTTLS, true, errp); if (ret <= 0) { if (ret == 0) { error_setg(errp, "Server don't support STARTTLS option"); @@ -687,7 +690,7 @@ static int nbd_receive_one_meta_context(QIOChannel *ioc, return -1; } - ret = nbd_handle_reply_err(ioc, &reply, errp); + ret = nbd_handle_reply_err(ioc, &reply, false, errp); if (ret <= 0) { return ret; } @@ -943,7 +946,7 @@ static int nbd_start_negotiate(AioContext *aio_context, QIOChannel *ioc, if (structured_reply) { result = nbd_request_simple_option(ioc, NBD_OPT_STRUCTURED_REPLY, - errp); + false, errp); if (result < 0) { return -EINVAL; } |