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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/dns/pascalifydnsname.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dns/dns.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
/**
* Writes dotted hostname to DNS message wire.
*
* The wire format is basically a sequence of Pascal strings, for each
* label in the name. We only do enough validation to maintain protocol
* invariants.
*
* @param name is a dotted NUL-terminated hostname string
* @return bytes written (excluding NUL) or -1 w/ errno
*/
int pascalifydnsname(uint8_t *buf, size_t size, const char *name) {
size_t i = 0;
size_t namelen = strlen(name);
if (namelen > DNS_NAME_MAX) return enametoolong();
if (size || namelen) {
if (namelen + 1 > size) return enospc();
buf[0] = '\0';
size_t j = 0;
for (;;) {
size_t k;
for (k = 0; name[j + k] && name[j + k] != '.'; ++k) {
buf[i + k + 1] = name[j + k];
}
if (k) {
if (k > DNS_LABEL_MAX) return enametoolong();
buf[i] = k;
i += k + 1;
}
j += k + 1;
if (!name[j - 1]) {
break;
}
}
buf[i] = '\0';
}
return i;
}