mirror of
https://github.com/jart/cosmopolitan.git
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87 lines
3.8 KiB
C
87 lines
3.8 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/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/dns/hoststxt.h"
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#include "libc/fmt/fmt.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/pushpop.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/systeminfo.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/thread/thread.h"
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static struct HostsTxt *g_hoststxt;
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static struct HostsTxtInitialStaticMemory {
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struct HostsTxt ht;
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pthread_mutex_t lock;
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struct HostsTxtEntry entries[8];
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char strings[64];
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} g_hoststxt_init;
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static textwindows dontinline char *GetNtHostsTxtPath(char *pathbuf,
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uint32_t size) {
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const char *const kWinHostsPath = "\\drivers\\etc\\hosts";
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uint32_t len = GetSystemDirectoryA(&pathbuf[0], size);
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if (len && len + strlen(kWinHostsPath) + 1 < size) {
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if (pathbuf[len] == '\\') pathbuf[len--] = '\0';
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memcpy(&pathbuf[len], kWinHostsPath, strlen(kWinHostsPath) + 1);
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return &pathbuf[0];
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} else {
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return NULL;
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}
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}
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/**
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* Returns hosts.txt map.
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*
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* @note yoinking realloc() ensures there's no size limits
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* @threadsafe
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*/
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const struct HostsTxt *GetHostsTxt(void) {
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FILE *f;
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const char *path;
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char pathbuf[PATH_MAX];
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struct HostsTxtInitialStaticMemory *init;
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init = &g_hoststxt_init;
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pthread_mutex_lock(&init->lock);
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if (!g_hoststxt) {
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g_hoststxt = &init->ht;
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init->ht.entries.n = pushpop(ARRAYLEN(init->entries));
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init->ht.entries.p = init->entries;
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init->ht.strings.n = pushpop(ARRAYLEN(init->strings));
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init->ht.strings.p = init->strings;
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__cxa_atexit(FreeHostsTxt, &g_hoststxt, NULL);
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path = "/etc/hosts";
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if (IsWindows()) {
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path = firstnonnull(GetNtHostsTxtPath(pathbuf, ARRAYLEN(pathbuf)), path);
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}
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if (fileexists(path) && (f = fopen(path, "r"))) {
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if (ParseHostsTxt(g_hoststxt, f) == -1) {
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/* TODO(jart): Elevate robustness. */
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}
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fclose(f);
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}
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}
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pthread_mutex_unlock(&init->lock);
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return g_hoststxt;
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}
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