mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
68c7c9c1e0
- Use good ELF technique in cosmo_dlopen() - Make strerror() conform more to other libc impls - Introduce __clear_cache() and use it in cosmo_dlopen() - Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)
84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/cxxabi.h"
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#include "libc/dce.h"
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#include "libc/dns/resolvconf.h"
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#include "libc/intrin/pushpop.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/stdio/stdio.h"
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#include "libc/thread/thread.h"
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static struct ResolvConf *g_resolvconf;
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static struct ResolvConfInitialStaticMemory {
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struct ResolvConf rv;
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pthread_mutex_t lock;
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struct sockaddr_in nameservers[3];
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} g_resolvconf_init;
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/**
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* Returns singleton with DNS server address.
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*/
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const struct ResolvConf *GetResolvConf(void) {
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int rc;
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FILE *f;
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struct ResolvConfInitialStaticMemory *init;
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init = &g_resolvconf_init;
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pthread_mutex_lock(&init->lock);
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if (!g_resolvconf) {
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g_resolvconf = &init->rv;
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pushmov(&init->rv.nameservers.n, ARRAYLEN(init->nameservers));
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init->rv.nameservers.p = init->nameservers;
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__cxa_atexit((void *)FreeResolvConf, &g_resolvconf, NULL);
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if (!IsWindows()) {
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if ((f = fopen("/etc/resolv.conf", "r"))) {
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rc = ParseResolvConf(g_resolvconf, f);
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} else {
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rc = -1;
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}
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fclose(f);
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} else {
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rc = GetNtNameServers(g_resolvconf);
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}
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if (rc == -1 && !IsTiny()) {
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/* TODO(jart): Elevate robustness. */
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}
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}
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pthread_mutex_unlock(&init->lock);
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return g_resolvconf;
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}
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/**
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* Frees resolv.conf data structure populated by ParseResolvConf().
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*/
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void FreeResolvConf(struct ResolvConf **rvp) {
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if (*rvp) {
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if ((*rvp)->nameservers.p != g_resolvconf_init.nameservers) {
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free((*rvp)->nameservers.p);
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}
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if (*rvp != &g_resolvconf_init.rv) {
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free(*rvp);
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}
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*rvp = 0;
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}
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}
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