mirror of https://github.com/c-ares/c-ares.git
Brad House
7 months ago
parent
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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_setup.h" |
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#include "ares.h" |
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#include "ares_private.h" |
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#include "ares_event.h" |
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static void ares_event_configchg_reload(ares_channel_t *channel) |
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{ |
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/* XXX: dispatch via thread so we don't block events */ |
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ares_reinit(channel); |
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} |
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#ifdef __LINUX__ |
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# include <sys/inotify.h> |
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struct ares_event_configchg { |
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int inotify_fd; |
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ares_event_t *event; |
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}; |
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void ares_event_configchg_destroy(ares_event_configchg_t *configchg, , ares_event_thread *e) |
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{ |
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if (configchg == NULL || configchg->inotify_fd == -1) { |
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return; |
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} |
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ares_event_update(NULL, e, ARES_EVENT_FLAG_NONE, NULL, configchg->inotify_fd, NULL, NULL); |
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} |
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static void ares_event_configchg_free(void *data) |
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{ |
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ares_event_configchg_t *configchg = data; |
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if (configchg == NULL) |
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return; |
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if (configchg->inotify_fd >= 0) { |
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close(configchg->inotify_fd); |
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configchg->inotify_fd = -1; |
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} |
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ares_free(configchg); |
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} |
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void ares_event_configchg_cb(ares_event_thread_t *e, ares_socket_t fd, |
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void *data, ares_event_flags_t flags) |
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{ |
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ares_event_configchg_t *configchg = data; |
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/* Some systems cannot read integer variables if they are not
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properly aligned. On other systems, incorrect alignment may |
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decrease performance. Hence, the buffer used for reading from |
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the inotify file descriptor should have the same alignment as |
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struct inotify_event. */ |
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char buf[4096] __attribute__ ((aligned(__alignof__(struct inotify_event)))); |
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const struct inotify_event *event; |
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ssize_t len; |
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ares_bool_t triggered = ARES_FALSE; |
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while (1) { |
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const char *ptr; |
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len = read(fd, buf, sizeof(buf)); |
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if (len <= 0) { |
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break; |
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} |
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/* Loop over all events in the buffer. */ |
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for (ptr = buf; ptr < buf + len; |
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ptr += sizeof(struct inotify_event) + event->len) { |
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event = (const struct inotify_event *)ptr; |
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if (event->name == NULL) |
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continue; |
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if (strcasecmp(name, "resolv.conf") == 0 || |
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strcasecmp(name, "nsswitch.conf") == 0) { |
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triggered = ARES_TRUE; |
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} |
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} |
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} |
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if (triggered) { |
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ares_event_configchg_reload(e->channel); |
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} |
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} |
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ares_status_t ares_event_configchg_init(ares_event_configchg_t **configchg, ares_event_thread *e) |
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{ |
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ares_status_t status = ARES_SUCCESS; |
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*configchg = ares_malloc_zero(sizeof(**configchg)); |
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if (*configchg == NULL) { |
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return ARES_ENOMEM; |
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} |
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*configchg->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
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if (*configchg->inotify_fd == -1) { |
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status = ARES_ESERVFAIL; |
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goto done; |
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} |
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/* We need to monitor /etc/resolv.conf, /etc/nsswitch.conf */ |
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if (inotify_add_watch(*configchg->inotify_fd, "/etc", IN_CREATE|IN_MODIFY|IN_MOVED_TO|IN_ONLYDIR) == -1) { |
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status = ARES_ESERVFAIL; |
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goto done; |
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} |
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status = ares_event_update(&(*configchg)->event, e, ARES_EVENT_FLAG_READ, |
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cb, *configchg->inotify_fd, |
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ares_event_configchg_free, NULL); |
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done: |
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if (status != ARES_SUCCESS) { |
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ares_event_configchg_destroy(*configchg); |
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*configchg = NULL; |
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} |
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return status; |
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} |
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#elif defined(_WIN32) |
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#elif defined(__APPLE__) |
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#else |
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#endif |
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