mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-06-01 18:22:27 +00:00
Add libresolv from Musl Libc
Locally modified to get nameservers from Windows Registry when `\etc\resolv.conf` isn't defined.
This commit is contained in:
Justine Tunney
parent
8874a37abc
commit
1a96de6eda
36 changed files with 2313 additions and 73 deletions
201
third_party/musl/ns_parse.c
vendored
Normal file
201
third_party/musl/ns_parse.c
vendored
Normal file
|
|
@ -0,0 +1,201 @@
|
|||
/*-*- 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/errno.h"
|
||||
#include "third_party/musl/resolv.h"
|
||||
#include "third_party/musl/nameser.h"
|
||||
|
||||
asm(".ident\t\"\\n\\n\
|
||||
Musl libc (MIT License)\\n\
|
||||
Copyright 2005-2014 Rich Felker, et. al.\"");
|
||||
asm(".include \"libc/disclaimer.inc\"");
|
||||
|
||||
const struct _ns_flagdata _ns_flagdata[16] = {
|
||||
{ 0x8000, 15 },
|
||||
{ 0x7800, 11 },
|
||||
{ 0x0400, 10 },
|
||||
{ 0x0200, 9 },
|
||||
{ 0x0100, 8 },
|
||||
{ 0x0080, 7 },
|
||||
{ 0x0040, 6 },
|
||||
{ 0x0020, 5 },
|
||||
{ 0x0010, 4 },
|
||||
{ 0x000f, 0 },
|
||||
{ 0x0000, 0 },
|
||||
{ 0x0000, 0 },
|
||||
{ 0x0000, 0 },
|
||||
{ 0x0000, 0 },
|
||||
{ 0x0000, 0 },
|
||||
{ 0x0000, 0 },
|
||||
};
|
||||
|
||||
unsigned ns_get16(const unsigned char *cp)
|
||||
{
|
||||
return cp[0]<<8 | cp[1];
|
||||
}
|
||||
|
||||
unsigned long ns_get32(const unsigned char *cp)
|
||||
{
|
||||
return (unsigned)cp[0]<<24 | cp[1]<<16 | cp[2]<<8 | cp[3];
|
||||
}
|
||||
|
||||
void ns_put16(unsigned s, unsigned char *cp)
|
||||
{
|
||||
*cp++ = s>>8;
|
||||
*cp++ = s;
|
||||
}
|
||||
|
||||
void ns_put32(unsigned long l, unsigned char *cp)
|
||||
{
|
||||
*cp++ = l>>24;
|
||||
*cp++ = l>>16;
|
||||
*cp++ = l>>8;
|
||||
*cp++ = l;
|
||||
}
|
||||
|
||||
int ns_initparse(const unsigned char *msg, int msglen, ns_msg *handle)
|
||||
{
|
||||
int i, r;
|
||||
|
||||
handle->_msg = msg;
|
||||
handle->_eom = msg + msglen;
|
||||
if (msglen < (2 + ns_s_max) * NS_INT16SZ) goto bad;
|
||||
NS_GET16(handle->_id, msg);
|
||||
NS_GET16(handle->_flags, msg);
|
||||
for (i = 0; i < ns_s_max; i++) NS_GET16(handle->_counts[i], msg);
|
||||
for (i = 0; i < ns_s_max; i++) {
|
||||
if (handle->_counts[i]) {
|
||||
handle->_sections[i] = msg;
|
||||
r = ns_skiprr(msg, handle->_eom, i, handle->_counts[i]);
|
||||
if (r < 0) return -1;
|
||||
msg += r;
|
||||
} else {
|
||||
handle->_sections[i] = NULL;
|
||||
}
|
||||
}
|
||||
if (msg != handle->_eom) goto bad;
|
||||
handle->_sect = ns_s_max;
|
||||
handle->_rrnum = -1;
|
||||
handle->_msg_ptr = NULL;
|
||||
return 0;
|
||||
bad:
|
||||
errno = EMSGSIZE;
|
||||
return -1;
|
||||
}
|
||||
|
||||
int ns_skiprr(const unsigned char *ptr, const unsigned char *eom, ns_sect section, int count)
|
||||
{
|
||||
const unsigned char *p = ptr;
|
||||
int r;
|
||||
|
||||
while (count--) {
|
||||
r = dn_skipname(p, eom);
|
||||
if (r < 0) goto bad;
|
||||
if (r + 2 * NS_INT16SZ > eom - p) goto bad;
|
||||
p += r + 2 * NS_INT16SZ;
|
||||
if (section != ns_s_qd) {
|
||||
if (NS_INT32SZ + NS_INT16SZ > eom - p) goto bad;
|
||||
p += NS_INT32SZ;
|
||||
NS_GET16(r, p);
|
||||
if (r > eom - p) goto bad;
|
||||
p += r;
|
||||
}
|
||||
}
|
||||
return p - ptr;
|
||||
bad:
|
||||
errno = EMSGSIZE;
|
||||
return -1;
|
||||
}
|
||||
|
||||
int ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr)
|
||||
{
|
||||
int r;
|
||||
|
||||
if (section < 0 || section >= ns_s_max) goto bad;
|
||||
if (section != handle->_sect) {
|
||||
handle->_sect = section;
|
||||
handle->_rrnum = 0;
|
||||
handle->_msg_ptr = handle->_sections[section];
|
||||
}
|
||||
if (rrnum == -1) rrnum = handle->_rrnum;
|
||||
if (rrnum < 0 || rrnum >= handle->_counts[section]) goto bad;
|
||||
if (rrnum < handle->_rrnum) {
|
||||
handle->_rrnum = 0;
|
||||
handle->_msg_ptr = handle->_sections[section];
|
||||
}
|
||||
if (rrnum > handle->_rrnum) {
|
||||
r = ns_skiprr(handle->_msg_ptr, handle->_eom, section, rrnum - handle->_rrnum);
|
||||
if (r < 0) return -1;
|
||||
handle->_msg_ptr += r;
|
||||
handle->_rrnum = rrnum;
|
||||
}
|
||||
r = ns_name_uncompress(handle->_msg, handle->_eom, handle->_msg_ptr, rr->name, NS_MAXDNAME);
|
||||
if (r < 0) return -1;
|
||||
handle->_msg_ptr += r;
|
||||
if (2 * NS_INT16SZ > handle->_eom - handle->_msg_ptr) goto size;
|
||||
NS_GET16(rr->type, handle->_msg_ptr);
|
||||
NS_GET16(rr->rr_class, handle->_msg_ptr);
|
||||
if (section != ns_s_qd) {
|
||||
if (NS_INT32SZ + NS_INT16SZ > handle->_eom - handle->_msg_ptr) goto size;
|
||||
NS_GET32(rr->ttl, handle->_msg_ptr);
|
||||
NS_GET16(rr->rdlength, handle->_msg_ptr);
|
||||
if (rr->rdlength > handle->_eom - handle->_msg_ptr) goto size;
|
||||
rr->rdata = handle->_msg_ptr;
|
||||
handle->_msg_ptr += rr->rdlength;
|
||||
} else {
|
||||
rr->ttl = 0;
|
||||
rr->rdlength = 0;
|
||||
rr->rdata = NULL;
|
||||
}
|
||||
handle->_rrnum++;
|
||||
if (handle->_rrnum > handle->_counts[section]) {
|
||||
handle->_sect = section + 1;
|
||||
if (handle->_sect == ns_s_max) {
|
||||
handle->_rrnum = -1;
|
||||
handle->_msg_ptr = NULL;
|
||||
} else {
|
||||
handle->_rrnum = 0;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
bad:
|
||||
errno = ENODEV;
|
||||
return -1;
|
||||
size:
|
||||
errno = EMSGSIZE;
|
||||
return -1;
|
||||
}
|
||||
|
||||
int ns_name_uncompress(const unsigned char *msg, const unsigned char *eom,
|
||||
const unsigned char *src, char *dst, size_t dstsiz)
|
||||
{
|
||||
int r;
|
||||
r = dn_expand(msg, eom, src, dst, dstsiz);
|
||||
if (r < 0) errno = EMSGSIZE;
|
||||
return r;
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue