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Add libresolv from Musl Libc

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Locally modified to get nameservers from Windows Registry when
`\etc\resolv.conf` isn't defined.
This commit is contained in:
Justine Tunney 2023-12-08 20:03:03 -08:00
parent 8874a37abc
commit 1a96de6eda
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GPG key ID: BE714B4575D6E328
36 changed files with 2313 additions and 73 deletions
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78
third_party/musl/res_mkquery.c vendored Normal file
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
│ vi: set noet ft=c ts=8 tw=8 fenc=utf-8 :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│ │
│ Musl Libc │
│ Copyright © 2005-2014 Rich Felker, et al. │
│ │
│ Permission is hereby granted, free of charge, to any person obtaining │
│ a copy of this software and associated documentation files (the │
│ "Software"), to deal in the Software without restriction, including │
│ without limitation the rights to use, copy, modify, merge, publish, │
│ distribute, sublicense, and/or sell copies of the Software, and to │
│ permit persons to whom the Software is furnished to do so, subject to │
│ the following conditions: │
│ │
│ The above copyright notice and this permission notice shall be │
│ included in all copies or substantial portions of the Software. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
│ │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/timespec.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/musl/resolv.internal.h"
asm(".ident\t\"\\n\\n\
Musl libc (MIT License)\\n\
Copyright 2005-2014 Rich Felker, et. al.\"");
asm(".include \"libc/disclaimer.inc\"");
int __res_mkquery(int op, const char *dname, int class, int type,
const unsigned char *data, int datalen,
const unsigned char *newrr, unsigned char *buf, int buflen)
{
int id, i, j;
unsigned char q[280];
struct timespec ts;
size_t l = strnlen(dname, 255);
int n;
if (l && dname[l-1]=='.') l--;
if (l && dname[l-1]=='.') return -1;
n = 17+l+!!l;
if (l>253 || buflen<n || op>15u || class>255u || type>255u)
return -1;
/* Construct query template - ID will be filled later */
memset(q, 0, n);
q[2] = op*8 + 1;
q[3] = 32; /* AD */
q[5] = 1;
memcpy((char *)q+13, dname, l);
for (i=13; q[i]; i=j+1) {
for (j=i; q[j] && q[j] != '.'; j++);
if (j-i-1u > 62u) return -1;
q[i-1] = j-i;
}
q[i+1] = type;
q[i+3] = class;
/* Make a reasonably unpredictable id */
clock_gettime(CLOCK_REALTIME, &ts);
id = (ts.tv_nsec + ts.tv_nsec/65536UL) & 0xffff;
q[0] = id/256;
q[1] = id;
memcpy(buf, q, n);
return n;
}
__weak_reference(__res_mkquery, res_mkquery);