mirror of https://github.com/c-ares/c-ares.git
Improve socket function replacement subsystem (#894)
Some external users swap out the entire IP stack, such as [Seastar](https://github.com/scylladb/seastar) that uses DPDK. So we need to allow them to override all network stack functions used by c-ares. Since we don't know what network functions may be needed in the future, we need to make a versioned structure that can be expanded. We'll need to disable any features in the future if the versioned interface is less than is required to support any new features. We recently had a regression when we added DNS Cookie support as we relied on `getsockname()` to get the local source ip address, but we were calling the native version since there was no registered callback available. We will mark this as optional and just skip this step in DNS Cookie invalidation if its not available for the legacy api users. Supersedes #893 Authored-By: Brad House (@bradh352)pull/895/head
Brad House
2 months ago
committed by
GitHub
parent
759343ae00
commit
02745437e6
29 changed files with 1447 additions and 594 deletions
@ -0,0 +1,3 @@ |
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.\" Copyright (C) 2024 The c-ares project and its contributors. |
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.\" SPDX-License-Identifier: MIT |
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.so man3/ares_set_socket_functions.3 |
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@ -0,0 +1,586 @@ |
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/* MIT License
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* |
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* Copyright (c) 2024 Brad House |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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* SPDX-License-Identifier: MIT |
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*/ |
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#include "ares_private.h" |
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#ifdef HAVE_SYS_UIO_H |
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# include <sys/uio.h> |
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#endif |
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#ifdef HAVE_NETINET_IN_H |
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# include <netinet/in.h> |
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#endif |
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#ifdef HAVE_NETINET_TCP_H |
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# include <netinet/tcp.h> |
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#endif |
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#ifdef HAVE_NETDB_H |
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# include <netdb.h> |
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#endif |
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#ifdef HAVE_ARPA_INET_H |
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# include <arpa/inet.h> |
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#endif |
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#ifdef HAVE_STRINGS_H |
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# include <strings.h> |
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#endif |
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#ifdef HAVE_SYS_IOCTL_H |
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# include <sys/ioctl.h> |
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#endif |
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#ifdef NETWARE |
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# include <sys/filio.h> |
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#endif |
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#include <assert.h> |
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#include <fcntl.h> |
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#include <limits.h> |
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#if defined(__linux__) && defined(TCP_FASTOPEN_CONNECT) |
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# define TFO_SUPPORTED 1 |
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# define TFO_SKIP_CONNECT 0 |
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# define TFO_USE_SENDTO 0 |
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# define TFO_USE_CONNECTX 0 |
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# define TFO_CLIENT_SOCKOPT TCP_FASTOPEN_CONNECT |
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#elif defined(__FreeBSD__) && defined(TCP_FASTOPEN) |
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# define TFO_SUPPORTED 1 |
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# define TFO_SKIP_CONNECT 1 |
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# define TFO_USE_SENDTO 1 |
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# define TFO_USE_CONNECTX 0 |
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# define TFO_CLIENT_SOCKOPT TCP_FASTOPEN |
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#elif defined(__APPLE__) && defined(HAVE_CONNECTX) |
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# define TFO_SUPPORTED 1 |
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# define TFO_SKIP_CONNECT 0 |
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# define TFO_USE_SENDTO 0 |
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# define TFO_USE_CONNECTX 1 |
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# undef TFO_CLIENT_SOCKOPT |
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#else |
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# define TFO_SUPPORTED 0 |
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#endif |
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#ifndef HAVE_WRITEV |
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/* Structure for scatter/gather I/O. */ |
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struct iovec { |
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void *iov_base; /* Pointer to data. */ |
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size_t iov_len; /* Length of data. */ |
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}; |
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#endif |
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ares_status_t |
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ares_set_socket_functions_ex(ares_channel_t *channel, |
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const struct ares_socket_functions_ex *funcs, |
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void *user_data) |
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{ |
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unsigned int known_versions[] = { 1 }; |
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size_t i; |
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if (channel == NULL || funcs == NULL) { |
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return ARES_EFORMERR; |
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} |
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/* Check to see if we know the version referenced */ |
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for (i = 0; i < sizeof(known_versions) / sizeof(*known_versions); i++) { |
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if (funcs->version == known_versions[i]) { |
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break; |
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} |
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} |
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if (i == sizeof(known_versions) / sizeof(*known_versions)) { |
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return ARES_EFORMERR; |
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} |
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memset(&channel->sock_funcs, 0, sizeof(channel->sock_funcs)); |
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/* Copy individually for ABI compliance. memcpy() with a sizeof would do
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* invalid reads */ |
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if (funcs->version >= 1) { |
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if (funcs->asocket == NULL || funcs->aclose == NULL || |
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funcs->asetsockopt == NULL || funcs->aconnect == NULL || |
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funcs->arecvfrom == NULL || funcs->asendto == NULL) { |
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return ARES_EFORMERR; |
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} |
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channel->sock_funcs.version = funcs->version; |
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channel->sock_funcs.flags = funcs->flags; |
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channel->sock_funcs.asocket = funcs->asocket; |
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channel->sock_funcs.aclose = funcs->aclose; |
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channel->sock_funcs.asetsockopt = funcs->asetsockopt; |
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channel->sock_funcs.aconnect = funcs->aconnect; |
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channel->sock_funcs.arecvfrom = funcs->arecvfrom; |
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channel->sock_funcs.asendto = funcs->asendto; |
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channel->sock_funcs.agetsockname = funcs->agetsockname; |
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channel->sock_funcs.abind = funcs->abind; |
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} |
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/* Implement newer versions here ...*/ |
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channel->sock_func_cb_data = user_data; |
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return ARES_SUCCESS; |
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} |
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static int setsocknonblock(ares_socket_t sockfd, /* operate on this */ |
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int nonblock /* TRUE or FALSE */) |
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{ |
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#if defined(HAVE_FCNTL_O_NONBLOCK) |
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/* most recent unix versions */ |
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int flags; |
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flags = fcntl(sockfd, F_GETFL, 0); |
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if (nonblock) { |
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return fcntl(sockfd, F_SETFL, flags | O_NONBLOCK); |
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} else { |
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return fcntl(sockfd, F_SETFL, flags & (~O_NONBLOCK)); /* LCOV_EXCL_LINE */ |
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} |
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#elif defined(HAVE_IOCTL_FIONBIO) |
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/* older unix versions */ |
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int flags = nonblock ? 1 : 0; |
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return ioctl(sockfd, FIONBIO, &flags); |
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#elif defined(HAVE_IOCTLSOCKET_FIONBIO) |
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# ifdef WATT32 |
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char flags = nonblock ? 1 : 0; |
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# else |
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/* Windows */ |
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unsigned long flags = nonblock ? 1UL : 0UL; |
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# endif |
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return ioctlsocket(sockfd, (long)FIONBIO, &flags); |
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#elif defined(HAVE_IOCTLSOCKET_CAMEL_FIONBIO) |
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/* Amiga */ |
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long flags = nonblock ? 1L : 0L; |
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return IoctlSocket(sockfd, FIONBIO, flags); |
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#elif defined(HAVE_SETSOCKOPT_SO_NONBLOCK) |
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/* BeOS */ |
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long b = nonblock ? 1L : 0L; |
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return setsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b)); |
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#else |
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# error "no non-blocking method was found/used/set" |
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#endif |
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} |
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static int default_aclose(ares_socket_t sock, void *user_data) |
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{ |
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(void)user_data; |
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#if defined(HAVE_CLOSESOCKET) |
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return closesocket(sock); |
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#elif defined(HAVE_CLOSESOCKET_CAMEL) |
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return CloseSocket(sock); |
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#elif defined(HAVE_CLOSE_S) |
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return close_s(sock); |
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#else |
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return close(sock); |
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#endif |
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} |
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static ares_socket_t default_asocket(int domain, int type, int protocol, |
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void *user_data) |
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{ |
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ares_socket_t s; |
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(void)user_data; |
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s = socket(domain, type, protocol); |
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if (s == ARES_SOCKET_BAD) { |
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return s; |
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} |
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if (setsocknonblock(s, 1) != 0) { |
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goto fail; /* LCOV_EXCL_LINE */ |
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} |
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#if defined(FD_CLOEXEC) && !defined(MSDOS) |
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/* Configure the socket fd as close-on-exec. */ |
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if (fcntl(s, F_SETFD, FD_CLOEXEC) != 0) { |
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goto fail; /* LCOV_EXCL_LINE */ |
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} |
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#endif |
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/* No need to emit SIGPIPE on socket errors */ |
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#if defined(SO_NOSIGPIPE) |
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{ |
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int opt = 1; |
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(void)setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, (void *)&opt, sizeof(opt)); |
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} |
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#endif |
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if (type == SOCK_STREAM) { |
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int opt = 1; |
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#ifdef TCP_NODELAY |
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/*
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* Disable the Nagle algorithm (only relevant for TCP sockets, and thus not |
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* in configure_socket). In general, in DNS lookups we're pretty much |
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* interested in firing off a single request and then waiting for a reply, |
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* so batching isn't very interesting. |
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*/ |
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if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *)&opt, sizeof(opt)) != |
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0) { |
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goto fail; |
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} |
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#endif |
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} |
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#if defined(IPV6_V6ONLY) && defined(USE_WINSOCK) |
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/* Support for IPv4-mapped IPv6 addresses.
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* Linux kernel, NetBSD, FreeBSD and Darwin: default is off; |
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* Windows Vista and later: default is on; |
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* DragonFly BSD: acts like off, and dummy setting; |
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* OpenBSD and earlier Windows: unsupported. |
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* Linux: controlled by /proc/sys/net/ipv6/bindv6only. |
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*/ |
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if (domain == PF_INET6) { |
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int on = 0; |
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(void)setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&on, sizeof(on)); |
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} |
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#endif |
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return s; |
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fail: |
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default_aclose(s, user_data); |
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return ARES_SOCKET_BAD; |
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} |
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static int default_asetsockopt(ares_socket_t sock, ares_socket_opt_t opt, |
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void *val, ares_socklen_t val_size, |
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void *user_data) |
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{ |
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switch (opt) { |
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case ARES_SOCKET_OPT_SENDBUF_SIZE: |
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if (val_size != sizeof(int)) { |
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SET_SOCKERRNO(EINVAL); |
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return -1; |
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} |
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return setsockopt(sock, SOL_SOCKET, SO_SNDBUF, val, val_size); |
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case ARES_SOCKET_OPT_RECVBUF_SIZE: |
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if (val_size != sizeof(int)) { |
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SET_SOCKERRNO(EINVAL); |
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return -1; |
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} |
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return setsockopt(sock, SOL_SOCKET, SO_RCVBUF, val, val_size); |
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case ARES_SOCKET_OPT_BIND_DEVICE: |
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if (!ares_str_isprint(val, (size_t)val_size)) { |
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SET_SOCKERRNO(EINVAL); |
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return -1; |
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} |
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#ifdef SO_BINDTODEVICE |
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return setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, val, val_size); |
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#else |
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SET_SOCKERRNO(ENOSYS); |
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return -1; |
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#endif |
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case ARES_SOCKET_OPT_TCP_FASTOPEN: |
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if (val_size != sizeof(ares_bool_t)) { |
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SET_SOCKERRNO(EINVAL); |
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return -1; |
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} |
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#if defined(TFO_CLIENT_SOCKOPT) |
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{ |
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int oval; |
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ares_bool_t *pval = val; |
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oval = (int)*pval; |
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return setsockopt(sock, IPPROTO_TCP, TFO_CLIENT_SOCKOPT, (void *)&oval, |
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sizeof(oval)); |
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} |
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#elif TFO_SUPPORTED |
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return 0; |
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#else |
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SET_SOCKERRNO(ENOSYS); |
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return -1; |
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#endif |
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}; |
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(void)user_data; |
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SET_SOCKERRNO(ENOSYS); |
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return -1; |
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} |
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static int default_aconnect(ares_socket_t sock, const struct sockaddr *address, |
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ares_socklen_t address_len, unsigned int flags, |
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void *user_data) |
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{ |
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(void)user_data; |
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#if defined(TFO_SKIP_CONNECT) && TFO_SKIP_CONNECT |
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if (flags & ARES_SOCKET_CONN_TCP_FASTOPEN) { |
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return 0; |
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} |
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return connect(sock, address, address_len); |
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#elif defined(TFO_USE_CONNECTX) && TFO_USE_CONNECTX |
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if (flags & ARES_SOCKET_CONN_TCP_FASTOPEN) { |
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sa_endpoints_t endpoints; |
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memset(&endpoints, 0, sizeof(endpoints)); |
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endpoints.sae_dstaddr = address; |
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endpoints.sae_dstaddrlen = address_len; |
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return connectx(sock, &endpoints, SAE_ASSOCID_ANY, |
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CONNECT_DATA_IDEMPOTENT | CONNECT_RESUME_ON_READ_WRITE, |
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NULL, 0, NULL, NULL); |
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} else { |
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return connect(sock, address, address_len); |
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} |
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#else |
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(void)flags; |
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return connect(sock, address, address_len); |
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#endif |
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} |
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static ares_ssize_t default_arecvfrom(ares_socket_t sock, void *buffer, |
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size_t length, int flags, |
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struct sockaddr *address, |
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ares_socklen_t *address_len, |
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void *user_data) |
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{ |
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(void)user_data; |
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#ifdef HAVE_RECVFROM |
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return (ares_ssize_t)recvfrom(sock, buffer, (RECVFROM_TYPE_ARG3)length, flags, |
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address, address_len); |
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#else |
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if (address != NULL && address_len != NULL) { |
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memset(address, 0, (size_t)*address_len); |
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address->sa_family = AF_UNSPEC; |
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} |
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return (ares_ssize_t)recv(sock, buffer, (RECVFROM_TYPE_ARG3)length, flags); |
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#endif |
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} |
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static ares_ssize_t default_asendto(ares_socket_t sock, const void *buffer, |
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size_t length, int flags, |
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const struct sockaddr *address, |
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ares_socklen_t address_len, void *user_data) |
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{ |
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(void)user_data; |
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if (address != NULL) { |
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#ifdef HAVE_SENDTO |
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return (ares_ssize_t)sendto((SEND_TYPE_ARG1)sock, (SEND_TYPE_ARG2)buffer, |
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(SEND_TYPE_ARG3)length, (SEND_TYPE_ARG4)flags, |
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address, address_len); |
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#else |
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(void)address_len; |
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#endif |
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} |
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return (ares_ssize_t)send((SEND_TYPE_ARG1)sock, (SEND_TYPE_ARG2)buffer, |
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(SEND_TYPE_ARG3)length, (SEND_TYPE_ARG4)flags); |
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} |
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static int default_agetsockname(ares_socket_t sock, struct sockaddr *address, |
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ares_socklen_t *address_len, void *user_data) |
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{ |
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(void)user_data; |
||||||
|
return getsockname(sock, address, address_len); |
||||||
|
} |
||||||
|
|
||||||
|
static int default_abind(ares_socket_t sock, unsigned int flags, |
||||||
|
const struct sockaddr *address, socklen_t address_len, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
(void)user_data; |
||||||
|
|
||||||
|
#ifdef IP_BIND_ADDRESS_NO_PORT |
||||||
|
if (flags & ARES_SOCKET_BIND_TCP && flags & ARES_SOCKET_BIND_CLIENT) { |
||||||
|
int opt = 1; |
||||||
|
(void)setsockopt(sock, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &opt, sizeof(opt)); |
||||||
|
} |
||||||
|
#else |
||||||
|
(void)flags; |
||||||
|
#endif |
||||||
|
|
||||||
|
return bind(sock, address, address_len); |
||||||
|
} |
||||||
|
|
||||||
|
static unsigned int default_aif_nametoindex(const char *ifname, void *user_data) |
||||||
|
{ |
||||||
|
(void)user_data; |
||||||
|
return ares_os_if_nametoindex(ifname); |
||||||
|
} |
||||||
|
|
||||||
|
static const char *default_aif_indextoname(unsigned int ifindex, |
||||||
|
char *ifname_buf, |
||||||
|
size_t ifname_buf_len, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
(void)user_data; |
||||||
|
return ares_os_if_indextoname(ifindex, ifname_buf, ifname_buf_len); |
||||||
|
} |
||||||
|
|
||||||
|
static const struct ares_socket_functions_ex default_socket_functions = { |
||||||
|
1, |
||||||
|
ARES_SOCKFUNC_FLAG_NONBLOCKING, |
||||||
|
default_asocket, |
||||||
|
default_aclose, |
||||||
|
default_asetsockopt, |
||||||
|
default_aconnect, |
||||||
|
default_arecvfrom, |
||||||
|
default_asendto, |
||||||
|
default_agetsockname, |
||||||
|
default_abind, |
||||||
|
default_aif_nametoindex, |
||||||
|
default_aif_indextoname |
||||||
|
}; |
||||||
|
|
||||||
|
void ares_set_socket_functions_default(ares_channel_t *channel) |
||||||
|
{ |
||||||
|
ares_set_socket_functions_ex(channel, &default_socket_functions, NULL); |
||||||
|
} |
||||||
|
|
||||||
|
static int legacycb_aclose(ares_socket_t sock, void *user_data) |
||||||
|
{ |
||||||
|
ares_channel_t *channel = user_data; |
||||||
|
|
||||||
|
if (channel->legacy_sock_funcs != NULL && |
||||||
|
channel->legacy_sock_funcs->aclose != NULL) { |
||||||
|
return channel->legacy_sock_funcs->aclose( |
||||||
|
sock, channel->legacy_sock_funcs_cb_data); |
||||||
|
} |
||||||
|
|
||||||
|
return default_aclose(sock, NULL); |
||||||
|
} |
||||||
|
|
||||||
|
static ares_socket_t legacycb_asocket(int domain, int type, int protocol, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
ares_channel_t *channel = user_data; |
||||||
|
|
||||||
|
if (channel->legacy_sock_funcs != NULL && |
||||||
|
channel->legacy_sock_funcs->asocket != NULL) { |
||||||
|
return channel->legacy_sock_funcs->asocket( |
||||||
|
domain, type, protocol, channel->legacy_sock_funcs_cb_data); |
||||||
|
} |
||||||
|
|
||||||
|
return default_asocket(domain, type, protocol, NULL); |
||||||
|
} |
||||||
|
|
||||||
|
static int legacycb_asetsockopt(ares_socket_t sock, ares_socket_opt_t opt, |
||||||
|
void *val, ares_socklen_t val_size, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
(void)sock; |
||||||
|
(void)opt; |
||||||
|
(void)val; |
||||||
|
(void)val_size; |
||||||
|
(void)user_data; |
||||||
|
SET_SOCKERRNO(ENOSYS); |
||||||
|
return -1; |
||||||
|
} |
||||||
|
|
||||||
|
static int legacycb_aconnect(ares_socket_t sock, const struct sockaddr *address, |
||||||
|
ares_socklen_t address_len, unsigned int flags, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
ares_channel_t *channel = user_data; |
||||||
|
|
||||||
|
if (channel->legacy_sock_funcs != NULL && |
||||||
|
channel->legacy_sock_funcs->aconnect != NULL) { |
||||||
|
return channel->legacy_sock_funcs->aconnect( |
||||||
|
sock, address, address_len, channel->legacy_sock_funcs_cb_data); |
||||||
|
} |
||||||
|
|
||||||
|
return default_aconnect(sock, address, address_len, flags, NULL); |
||||||
|
} |
||||||
|
|
||||||
|
static ares_ssize_t legacycb_arecvfrom(ares_socket_t sock, void *buffer, |
||||||
|
size_t length, int flags, |
||||||
|
struct sockaddr *address, |
||||||
|
ares_socklen_t *address_len, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
ares_channel_t *channel = user_data; |
||||||
|
|
||||||
|
if (channel->legacy_sock_funcs != NULL && |
||||||
|
channel->legacy_sock_funcs->arecvfrom != NULL) { |
||||||
|
if (address != NULL && address_len != NULL) { |
||||||
|
memset(address, 0, (size_t)*address_len); |
||||||
|
address->sa_family = AF_UNSPEC; |
||||||
|
} |
||||||
|
return channel->legacy_sock_funcs->arecvfrom( |
||||||
|
sock, buffer, length, flags, address, address_len, |
||||||
|
channel->legacy_sock_funcs_cb_data); |
||||||
|
} |
||||||
|
|
||||||
|
return default_arecvfrom(sock, buffer, length, flags, address, address_len, |
||||||
|
NULL); |
||||||
|
} |
||||||
|
|
||||||
|
static ares_ssize_t legacycb_asendto(ares_socket_t sock, const void *buffer, |
||||||
|
size_t length, int flags, |
||||||
|
const struct sockaddr *address, |
||||||
|
ares_socklen_t address_len, |
||||||
|
void *user_data) |
||||||
|
{ |
||||||
|
ares_channel_t *channel = user_data; |
||||||
|
|
||||||
|
if (channel->legacy_sock_funcs != NULL && |
||||||
|
channel->legacy_sock_funcs->asendv != NULL) { |
||||||
|
struct iovec vec; |
||||||
|
vec.iov_base = (void *)((size_t)buffer); /* Cast off const */ |
||||||
|
vec.iov_len = length; |
||||||
|
return channel->legacy_sock_funcs->asendv( |
||||||
|
sock, &vec, 1, channel->legacy_sock_funcs_cb_data); |
||||||
|
} |
||||||
|
|
||||||
|
return default_asendto(sock, buffer, length, flags, address, address_len, |
||||||
|
NULL); |
||||||
|
} |
||||||
|
|
||||||
|
|
||||||
|
static const struct ares_socket_functions_ex legacy_socket_functions = { |
||||||
|
1, |
||||||
|
0, |
||||||
|
legacycb_asocket, |
||||||
|
legacycb_aclose, |
||||||
|
legacycb_asetsockopt, |
||||||
|
legacycb_aconnect, |
||||||
|
legacycb_arecvfrom, |
||||||
|
legacycb_asendto, |
||||||
|
NULL, /* agetsockname */ |
||||||
|
NULL, /* abind */ |
||||||
|
NULL, /* aif_nametoindex */ |
||||||
|
NULL /* aif_indextoname */ |
||||||
|
}; |
||||||
|
|
||||||
|
void ares_set_socket_functions(ares_channel_t *channel, |
||||||
|
const struct ares_socket_functions *funcs, |
||||||
|
void *data) |
||||||
|
{ |
||||||
|
if (channel == NULL || channel->optmask & ARES_OPT_EVENT_THREAD) { |
||||||
|
return; |
||||||
|
} |
||||||
|
|
||||||
|
channel->legacy_sock_funcs = funcs; |
||||||
|
channel->legacy_sock_funcs_cb_data = data; |
||||||
|
ares_set_socket_functions_ex(channel, &legacy_socket_functions, channel); |
||||||
|
} |
||||||
Loading…
Reference in new issue