build: untangle `UNITTESTS` and `DEBUGBUILD` macros

- fix `DEBUGBUILD` guards that should be `UNITTESTS`, in libcurl code
used by unit tests.
- fix guards for libcurl functions use

build: untangle `UNITTESTS` and `DEBUGBUILD` macros

- fix `DEBUGBUILD` guards that should be `UNITTESTS`, in libcurl code
used by unit tests.
- fix guards for libcurl functions used in unit tests only.
- sync `UNITTEST` attribute between declarations and definitions.
- drop `DEBUGBUILD` guard from test `unit2600`.
- fix guards for libcurl HSTS code used by both a unit test (`unit1660`)
and `test0446`.
- update an existing AppVeyor CI job to test the issues fixed.

This fixes building tests with `CURLDEBUG` enabled but `DEBUGBUILD`
disabled. This can happen when building tests with CMake with
`ENABLE_DEBUG=ON` in Release config, or with `ENABLE_CURLDEBUG=ON`
and _without_ `ENABLE_DEBUG=ON`. Possibly also with autotools
when using `--enable-curldebug` without `--enable-debug`.

Test results:
- before:
https://ci.appveyor.com/project/curlorg/curl/builds/49835609
https://ci.appveyor.com/project/curlorg/curl/builds/49898529/job/k8qpbs8idby70smw
https://github.com/curl/curl/actions/runs/9259078835/job/25470318167?pr=13798#step:13:821
- after: https://ci.appveyor.com/project/curlorg/curl/builds/49839255
(the two failures are unrelated, subject to PR #13705)

Ref: #13592 (issue discovery)
Ref: #13689 (CI testing this PR with `DEBUGBUILD`/`CURLDEBUG` combinations)
Closes #13694

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doh: Remove unused function prototype

Closes: #13536
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

TLS: add support for ECH (Encrypted Client Hello)

An EXPERIMENTAL feature used with CURLOPT_ECH and --ech.

Closes #11922

DoH: add trace configuration

- refs #12397 where it is dicussed how to en-/disable verbose output
of DoH operations
- introducing `struct curl_trc_feat` to track a curl feature for

DoH: add trace configuration

- refs #12397 where it is dicussed how to en-/disable verbose output
of DoH operations
- introducing `struct curl_trc_feat` to track a curl feature for
tracing
- adding `data->state.feat` optionally pointing to the feature a
transfer belongs to
- adding trace functions and verbosity checks on features
- using trace feature in DoH code
- documenting `doh` as feature for `--trace-config`

Closes #12411

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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doh: move doh related struct definitions to doh.h

and make 'dnstype' in 'struct dnsprobe' use the DNStype to fix the icc compiler warning:

doh.c(924): error #188: enumerated type

doh: move doh related struct definitions to doh.h

and make 'dnstype' in 'struct dnsprobe' use the DNStype to fix the icc compiler warning:

doh.c(924): error #188: enumerated type mixed with another type

Reported-by: Matthew Thompson
Ref #9156
Closes #9174

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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cleanup: spell DoH with a lowercase o

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

Closes #7413

hostip: remove conn->data from resolver functions

This also moves the 'async' struct from the connectdata struct into the
Curl_easy struct, which seems like a better home for it.

hostip: remove conn->data from resolver functions

This also moves the 'async' struct from the connectdata struct into the
Curl_easy struct, which seems like a better home for it.

Closes #6497

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curl.se: new home

Closes #6172

source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public heade

source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public headers and examples

- Let MD4_CTX, MD5_CTX, and SHA256_CTX typedefs remain as they actually
typedef different types/structs depending on build conditions.

Closes #5338

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dynbuf: introduce internal generic dynamic buffer functions

A common set of functions instead of many separate implementations for
creating buffers that can grow when appending data to t

dynbuf: introduce internal generic dynamic buffer functions

A common set of functions instead of many separate implementations for
creating buffers that can grow when appending data to them. Existing
functionality has been ported over.

In my early basic testing, the total number of allocations seem at
roughly the same amount as before, possibly a few less.

See docs/DYNBUF.md for a description of the API.

Closes #5300

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headers: copyright range fix

doh: Constify some input pointers

Closes #5306

doh: improced both encoding and decoding

Improved estimation of expected_len and updated related comments;
increased strictness of QNAME-encoding, adding error detection for empty
la

doh: improced both encoding and decoding

Improved estimation of expected_len and updated related comments;
increased strictness of QNAME-encoding, adding error detection for empty
labels and names longer than the overall limit; avoided treating DNAME
as unexpected;

updated unit test 1655 with more thorough set of proofs and tests

Closes #4598

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cleanup: remove the 'numsocks' argument used in many places

It was used (intended) to pass in the size of the 'socks' array that is
also passed to these functions, but was rarely actuall

cleanup: remove the 'numsocks' argument used in many places

It was used (intended) to pass in the size of the 'socks' array that is
also passed to these functions, but was rarely actually checked/used and
the array is defined to a fixed size of MAX_SOCKSPEREASYHANDLE entries
that should be used instead.

Closes #4169

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doh: CURL_DISABLE_DOH

headers: end all headers with guard comment

Most headerfiles end with a /* <headerguard> */ comment, but it was
missing from some. The comment isn't the most important part of our
co

headers: end all headers with guard comment

Most headerfiles end with a /* <headerguard> */ comment, but it was
missing from some. The comment isn't the most important part of our
code documentation but consistency has an intrinsic value in itself.
This adds header guard comments to the files that were lacking it.

Closes #3158
Reviewed-by: Jay Satiro <raysatiro@yahoo.com>
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

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doh: keep the IPv4 address in (original) network byte order

Ideally this will fix the reversed order shown in SPARC tests:

resp 8: Expected 127.0.0.1 got 1.0.0.127

Closes

doh: keep the IPv4 address in (original) network byte order

Ideally this will fix the reversed order shown in SPARC tests:

resp 8: Expected 127.0.0.1 got 1.0.0.127

Closes #3091

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DOH: add test case 1650 and 2100

setopt: add CURLOPT_DOH_URL

Closes #2668