mirror of
https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
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/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/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/thread/thread.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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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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