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canonical names
We'll need this later when putting together RR serializations to
checksum.
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Some calls used ENOBUFS to indicate too-short result buffers, others
used ENOSPC. Let's unify this on ENOBUFS.
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Let's better be safe than sorry.
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domain
The root domain consists of zero labels, and we should be able to encode
that.
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Make sure dns_name_normalize(), dns_name_concat(), dns_name_is_valid()
do not accept/generate invalidly long hostnames, i.e. longer than 253
characters.
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Labels of zero length are not OK, refuse them early on. The concept of a
"zero-length label" doesn't exist, a zero-length full domain name
however does (representing the root domain). See RFC 2181, Section 11.
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The new dns_label_escape() call now operates on a buffer passed in,
similar to dns_label_unescape(). This should make decoding a bit faster,
and nicer.
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For similar reasons as dns_name_is_root() got changed in the previous
commit.
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Let's change the return value to bool. If we encounter an error while
parsing, return "false" instead of the actual parsing error, after all
the specified hostname does not qualify for what the function is
supposed to test.
Dealing with the additional error codes was always cumbersome, and
easily misused, like for example in the DHCP code.
Let's also rename the functions from dns_name_root() to
dns_name_is_root(), to indicate that this function checks something and
returns a bool. Similar for dns_name_is_signal_label().
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Most servers apparently always implicitly convert DNAME to CNAME, but
some servers don't, hence implement this properly, as this is required
by edns0.
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This adds dns_service_join() and dns_service_split() which may be used
to concatenate a DNS-SD service name, am SRV service type string, and a
domain name into a full resolvable DNS domain name string. If the
service name is specified as NULL, only the type and domain are
appended, to implement classic, non-DNS-SD SRV lookups.
The reverse is dns_service_split() which takes the full name, and split
it into the three components again.
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The function converts a domain name string to the wire format
described in RFC 1035 Section 3.1.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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This is specifically useful for appending the mDNS ".local" suffix to a
single-label hostname in the most correct way. (used in later commit)
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We already refuse to resolve "localhost", hence we should also refuse
resolving "127.0.0.1" and friends.
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Given three DNS names this function indicates if the second argument lies
strictly between the first and the third according to the canonical DNS
name order. Note that the order is circular, so the last name is
considered to be before the first.
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Intended to be called repeatedly, and returns then successive unescaped labels
from the most to the least significant (left to right).
This is slightly inefficient as it scans the string three times (two would be
sufficient): once to find the end of the string, once to find the beginning
of each label and lastly once to do the actual unescaping. The latter two
could be done in one go, but that seemed unnecessarily convoluted.
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