mirror of
https://gitlab.isc.org/isc-projects/bind9
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a3ba95116e
When the fragmentation is disabled on UDP sockets, the uv_udp_send() call can fail with UV_EMSGSIZE for messages larger than path MTU. Previously, this error would end with just discarding the response. In this commit, a proper handling of such case is added and on such error, a new DNS response with truncated bit set is generated and sent to the client. This change allows us to disable the fragmentation on the UDP sockets again.
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#include <stdbool.h>
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#include <uv.h>
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#include <isc/result.h>
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#include <isc/strerr.h>
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#include <isc/string.h>
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#include <isc/util.h>
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#include "netmgr-int.h"
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/*%
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* Convert a libuv error value into an isc_result_t. The
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* list of supported error values is not complete; new users
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* of this function should add any expected errors that are
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* not already there.
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*/
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isc_result_t
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isc___nm_uverr2result(int uverr, bool dolog, const char *file,
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unsigned int line, const char *func) {
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switch (uverr) {
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case 0:
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return (ISC_R_SUCCESS);
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case UV_ENOTDIR:
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case UV_ELOOP:
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case UV_EINVAL: /* XXX sometimes this is not for files */
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case UV_ENAMETOOLONG:
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case UV_EBADF:
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return (ISC_R_INVALIDFILE);
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case UV_ENOENT:
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return (ISC_R_FILENOTFOUND);
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case UV_EAGAIN:
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return (ISC_R_NOCONN);
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case UV_EACCES:
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case UV_EPERM:
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return (ISC_R_NOPERM);
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case UV_EEXIST:
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return (ISC_R_FILEEXISTS);
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case UV_EIO:
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return (ISC_R_IOERROR);
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case UV_ENOMEM:
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return (ISC_R_NOMEMORY);
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case UV_ENFILE:
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case UV_EMFILE:
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return (ISC_R_TOOMANYOPENFILES);
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case UV_ENOSPC:
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return (ISC_R_DISCFULL);
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case UV_EPIPE:
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case UV_ECONNRESET:
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case UV_ECONNABORTED:
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return (ISC_R_CONNECTIONRESET);
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case UV_ENOTCONN:
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return (ISC_R_NOTCONNECTED);
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case UV_ETIMEDOUT:
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return (ISC_R_TIMEDOUT);
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case UV_ENOBUFS:
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return (ISC_R_NORESOURCES);
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case UV_EAFNOSUPPORT:
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return (ISC_R_FAMILYNOSUPPORT);
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case UV_ENETDOWN:
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return (ISC_R_NETDOWN);
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case UV_EHOSTDOWN:
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return (ISC_R_HOSTDOWN);
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case UV_ENETUNREACH:
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return (ISC_R_NETUNREACH);
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case UV_EHOSTUNREACH:
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return (ISC_R_HOSTUNREACH);
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case UV_EADDRINUSE:
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return (ISC_R_ADDRINUSE);
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case UV_EADDRNOTAVAIL:
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return (ISC_R_ADDRNOTAVAIL);
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case UV_ECONNREFUSED:
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return (ISC_R_CONNREFUSED);
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case UV_ECANCELED:
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return (ISC_R_CANCELED);
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case UV_EOF:
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return (ISC_R_EOF);
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case UV_EMSGSIZE:
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return (ISC_R_MAXSIZE);
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default:
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if (dolog) {
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UNEXPECTED_ERROR(
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file, line,
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"unable to convert libuv "
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"error code in %s to isc_result: %d: %s",
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func, uverr, uv_strerror(uverr));
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}
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return (ISC_R_UNEXPECTED);
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}
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}
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