mirror of
https://github.com/jart/cosmopolitan.git
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2fc507c98f
* modelines: tw -> sw shiftwidth, not textwidth. * space-surround modelines * fix irregular modelines * Fix modeline in titlegen.c
78 lines
3.8 KiB
C
78 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clock.h"
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#include "third_party/musl/resolv.internal.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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int __res_mkquery(int op, const char *dname, int class, int type,
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const unsigned char *data, int datalen,
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const unsigned char *newrr, unsigned char *buf, int buflen)
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{
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int id, i, j;
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unsigned char q[280];
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struct timespec ts;
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size_t l = strnlen(dname, 255);
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int n;
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if (l && dname[l-1]=='.') l--;
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if (l && dname[l-1]=='.') return -1;
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n = 17+l+!!l;
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if (l>253 || buflen<n || op>15u || class>255u || type>255u)
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return -1;
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/* Construct query template - ID will be filled later */
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memset(q, 0, n);
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q[2] = op*8 + 1;
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q[3] = 32; /* AD */
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q[5] = 1;
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memcpy((char *)q+13, dname, l);
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for (i=13; q[i]; i=j+1) {
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for (j=i; q[j] && q[j] != '.'; j++);
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if (j-i-1u > 62u) return -1;
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q[i-1] = j-i;
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}
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q[i+1] = type;
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q[i+3] = class;
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/* Make a reasonably unpredictable id */
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clock_gettime(CLOCK_REALTIME, &ts);
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id = (ts.tv_nsec + ts.tv_nsec/65536UL) & 0xffff;
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q[0] = id/256;
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q[1] = id;
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memcpy(buf, q, n);
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return n;
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}
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__weak_reference(__res_mkquery, res_mkquery);
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