80 lines
3.8 KiB
C
80 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/bits/safemacros.internal.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/macros.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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struct HostsTxtEntry entries[8];
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char strings[64];
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} g_hoststxt_init;
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static textwindows noinline 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 parsed sorted singleton hardcoded hostname→ip4 map.
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*
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* @note yoinking realloc() ensures there's no size limits
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*/
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const struct HostsTxt *gethoststxt(void) {
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struct HostsTxtInitialStaticMemory *init = &g_hoststxt_init;
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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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char pathbuf[PATH_MAX];
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const char *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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FILE *f;
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if (!(f = fopen(path, "r")) || parsehoststxt(g_hoststxt, f) == -1) {
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if (!IsTiny()) fprintf(stderr, "%s: %s: %m\n", "warning", path);
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}
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fclose(f);
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sorthoststxt(g_hoststxt);
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}
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return g_hoststxt;
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}
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