Give more detailed reasons for certificate failures where available in
gnutls and wolfssi to allow user to understand the cause of the failure.
Closes#14501
`data->id` is unique in *most* situations, but not in all. If a libcurl
application uses more than one connection cache, they will overlap. This
is a rare situations, but libcurl apps do crazy things. However, for
informative things, like tracing, `data->id` is superior, since it
assigns new ids in curl's serial curl_easy_perform() use.
Introduce `data->mid` which is a unique identifer inside one multi
instance, assigned on multi_add_handle() and cleared on
multi_remove_handle().
Use the `mid` in DoH operations and also in h2/h3 stream hashes.
Reported-by: 罗朝辉
Fixes#14414Closes#14499
`SHA512_256_BLOCK_SIZE`, `SHA512_256_DIGEST_SIZE` macros were both
defined within curl and also in the nettle library required by GnuTLS.
Fix it by namespacing the curl macros.
Cherry-picked from #14495Closes#14514
Already used in `vtls.h`. Prefer this curl-namespaced name over the
unprefixed `SHA256_DIGEST_LENGTH`. The latter is also defined by TLS
backends with a potential to cause issues.
Also stop relying on externel headers setting this constant. It's
already defined in `vtls.h` on curl's behalf, do this also for `lib`.
Cherry-picked from #14495Closes#14513
Both of these projects define the same `SHA*` macros via headers
included by curl (in MultiSSL builds, possibly only in Unity builds),
causing redefinition compiler warnings.
Fix it by disabling compatibility macros in wolfSSL.
```
Building C object lib/CMakeFiles/libcurl_static.dir/Unity/unity_0_c.c.o
In file included from _bld/lib/CMakeFiles/libcurl_static.dir/Unity/unity_0_c.c:202:
In file included from lib/http_aws_sigv4.c:33:
In file included from lib/curl_sha256.h:40:
In file included from /usr/local/Cellar/wolfssl/5.7.2/include/wolfssl/openssl/sha.h:30:
/usr/local/Cellar/wolfssl/5.7.2/include/wolfssl/wolfcrypt/sha256.h:117:13: warning: 'SHA256_BLOCK_SIZE' macro redefined [-Wmacro-redefined]
#define SHA256_BLOCK_SIZE WC_SHA256_BLOCK_SIZE
^
/usr/local/Cellar/nettle/3.10/include/nettle/sha2.h:70:9: note: previous definition is here
#define SHA256_BLOCK_SIZE 64
^
In file included from _bld/lib/CMakeFiles/libcurl_static.dir/Unity/unity_0_c.c:202:
In file included from lib/http_aws_sigv4.c:33:
In file included from lib/curl_sha256.h:40:
In file included from /usr/local/Cellar/wolfssl/5.7.2/include/wolfssl/openssl/sha.h:30:
[...]
#define SHA256_DIGEST_SIZE WC_SHA256_DIGEST_SIZE
#define SHA224_BLOCK_SIZE WC_SHA224_BLOCK_SIZE
#define SHA224_DIGEST_SIZE WC_SHA224_DIGEST_SIZE
#define SHA512_BLOCK_SIZE WC_SHA512_BLOCK_SIZE
#define SHA512_DIGEST_SIZE WC_SHA512_DIGEST_SIZE
#define SHA384_BLOCK_SIZE WC_SHA384_BLOCK_SIZE
#define SHA384_DIGEST_SIZE WC_SHA384_DIGEST_SIZE
```
Cherry-picked from #14495Closes#14511
E.g. with Homebrew wolfssl 5.7.2 on macOS:
```
In file included from _bld/lib/CMakeFiles/libcurl_static.dir/Unity/unity_0_c.c:85:
lib/curl_ntlm_core.c:157:27: error: unknown type name 'DES_key_schedule'
DES_key_schedule DESKEYARG(ks))
^
lib/curl_ntlm_core.c:159:3: error: use of undeclared identifier 'DES_cblock'
DES_cblock key;
^
[...]
```
Earlier patch addressing this for OpenSSL:
802d864450#7808
Cherry-picked from #14495Closes#14512
When using CMake Unity build.
- use unique name for `set_ssl_version_min_max()`
Fixes collision between GnuTLS, mbedTLS and SecureTransport.
```
lib\vtls\mbedtls.c(317,1): error C2084: function 'CURLcode set_ssl_version_min_max(Curl_easy *,ssl_peer *,ssl_primary_config *,const char **,const char *)' already has a body
lib\vtls\mbedtls.c(837,49): warning C4133: 'function': incompatible types - from 'Curl_cfilter *' to 'Curl_easy *'
lib\vtls\mbedtls.c(837,53): warning C4133: 'function': incompatible types - from 'Curl_easy *' to 'ssl_peer *'
lib\vtls\mbedtls.c(837,25): error C2198: 'set_ssl_version_min_max': too few arguments for call
```
- use unique name for `do_file_type()`
Fixes collision between GnuTLS, OpenSSL and wolfSSL.
```
lib\vtls\openssl.c(1053,12): error C2084: function 'gnutls_x509_crt_fmt_t do_file_type(const char *)' already has a body
```
Ref: https://github.com/curl/curl/actions/runs/10341162641/job/28622681573?pr=14484#step:10:31
Cherry-picked from #14495Closes#14516
Silence bogus MSVC warning C4232. Use the method already used
for similar cases earlier.
Also fixup existing suppressions to use pragma push/pop.
```
lib\vquic\curl_ngtcp2.c(709,40): error C2220: the following warning is treated as an error
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'client_initial': address of dllimport 'ngtcp2_crypto_client_initial_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'recv_crypto_data': address of dllimport 'ngtcp2_crypto_recv_crypto_data_cb' is not static, identity not guaran
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'encrypt': address of dllimport 'ngtcp2_crypto_encrypt_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'decrypt': address of dllimport 'ngtcp2_crypto_decrypt_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'hp_mask': address of dllimport 'ngtcp2_crypto_hp_mask_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'recv_retry': address of dllimport 'ngtcp2_crypto_recv_retry_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'update_key': address of dllimport 'ngtcp2_crypto_update_key_cb' is not static, identity not guaranteed
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'delete_crypto_aead_ctx': address of dllimport 'ngtcp2_crypto_delete_crypto_aead_ctx_cb' is not static, identit
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'delete_crypto_cipher_ctx': address of dllimport 'ngtcp2_crypto_delete_crypto_cipher_ctx_cb' is not static, ide
lib\vquic\curl_ngtcp2.c(709,40): warning C4232: nonstandard extension used: 'get_path_challenge_data': address of dllimport 'ngtcp2_crypto_get_path_challenge_data_cb' is not static, ident
```
Ref: https://github.com/curl/curl/actions/runs/10343459009/job/28627621355#step:10:30
Cherry-picked from #14495
Co-authored-by: Tal Regev
Ref: #14383Closes#14510
Members of the filter context, like stream hash and buffers, need to be
initialized early and protected by a flag to also avoid double cleanup.
This allow the context to be used safely before a connect() is started
and the other parts of the context are set up.
Closes#14505
Before, setting CURLOPT_SSLVERSION with wolfSSL restricted the the tls
proto to just the specified version. Now it properly supports a range.
So it can set the min and max tls proto (max requires wolfSSL 4.2.0).
Bump the absolute minimum required version of wolfSSL to 3.4.6 (released
2015) because it is needed for the wolfSSL_CTX_SetMinVersion() function.
Closes#14480
When using `curl_ws_send()`, perform a blocking send of the data under
the following conditions:
- the websocket is in raw mode and the call is done from within a curl
callback. A partial write of the data could subsequently mess up the
ws framing, as a callback has a hard time handling this.
- the websocket is encoding the data itself, has added it to its
internal sendbuf. A partial flush of the buffer has unclear semantics
for the caller, as they will have no idea what to send again.
Fixes WebSockets tests with CURL_DBG_SOCK_WBLOCK=90 set.
Closes#14458
Channel Bindings are used to tie the session context to a specific TLS
channel. This is to provide additional proof of valid identity,
mitigating authentication relay attacks.
Major web servers have the ability to require (None/Accept/Require)
GSSAPI channel binding, rendering Curl unable to connect to such
websites unless support for channel bindings is implemented.
IIS calls this feature Extended Protection (EPA), which is used in
Enterprise environments using Kerberos for authentication.
This change require krb5 >= 1.19, otherwise channel bindings won't be
forwarded through SPNEGO.
Co-Authored-By: Steffen Kieß <947515+steffen-kiess@users.noreply.github.com>
Closes#13098
Rename internal macros to match their `libcurl.pc` metadata counterpart.
Also apply these to the `curl-config.in` template.
- `CPPFLAG_CURL_STATICLIB` -> `LIBCURL_PC_CFLAGS`
- `LIBCURL_LIBS` -> `LIBCURL_PC_LIBS_PRIVATE`
- `LIBCURL_NO_SHARED` -> `LIBCURL_PC_LIBS`
Closes#14476
- Turned them all into functions to also do asserts etc.
- The llist related structs got all their fields renamed in order to make
sure no existing code remains using direct access.
- Each list node struct now points back to the list it "lives in", so
Curl_node_remove() no longer needs the list pointer.
- Rename the node struct and some of the access functions.
- Added lots of ASSERTs to verify API being used correctly
- Fix some cases of API misuse
Add docs/LLIST.md documenting the internal linked list API.
Closes#14485
Instead of having an especially "unique" linked list handler for the
main list of easy handles within the multi handle, this now uses a
regular Curl_llist for this as well.
With this change, it is also clearer that every easy handle added to a
multi handle belongs to one and only one out of three different lists:
process - the general one for normal transfer processing
pending - queued up waiting to get a connection (MSTATE_PENDING)
msgsent - transfer completed (MSTATE_MSGSENT)
An easy handle must therefore be removed from the current list before it
gets added to another.
Closes#14474
- memdebug: replace keyword `malloc` with `__malloc__` to
not interfere with envs where `malloc` is redefined. Also apply
the fix to `alloc_size`.
Fixes:
```
lib/memdebug.h:107:13: warning: unknown attribute 'vec_malloc' ignored [-Wunknown-attributes]
CURL_EXTERN ALLOC_FUNC FILE *curl_dbg_fdopen(int filedes, const char *mode,
^~~~~~~~~~
lib/memdebug.h:37:37: note: expanded from macro 'ALLOC_FUNC'
# define ALLOC_FUNC __attribute__((malloc))
^~~~~~
/usr/include/stdlib.h:753:16: note: expanded from macro 'malloc'
#define malloc vec_malloc
^~~~~~~~~~
```
- memdebug: always undef before defining.
Also do this for the rest of functions redefined in the same block.
Avoids warning on AIX:
```
lib/memdebug.h:117:9: warning: 'malloc' macro redefined [-Wmacro-redefined]
#define malloc(size) curl_dbg_malloc(size, __LINE__, __FILE__)
^
/usr/include/stdlib.h:753:9: note: previous definition is here
#define malloc vec_malloc
^
```
- easy: fix `-Wformat` warning on AIX by adding a cast.
```
lib/easy.c:608:47: warning: format specifies type 'int' but the argument has type 'long' [-Wformat]
"%" CURL_FORMAT_SOCKET_T ")", fds[i].fd);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
```
- if2ip: silence compiler warning inside AIX system header.
```
/lib/if2ip.c:219:19: warning: signed shift result (0x80000000) sets the sign bit of the shift expression's type ('int') and becomes negative [-Wshift-sign-overflow]
if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
^~~~~~~~~~~
/usr/include/sys/ioctl.h:401:26: note: expanded from macro 'SIOCGIFADDR'
#define SIOCGIFADDR (int)_IOWR('i',33, struct oifreq) /* get ifnet address */
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/sys/ioctl.h:174:23: note: expanded from macro '_IOWR'
#define _IOWR(x,y,t) (IOC_INOUT|((sizeof(t)&IOCPARM_MASK)<<16)|(x<<8)|y)
^~~~~~~~~
/usr/include/sys/ioctl.h:168:20: note: expanded from macro 'IOC_INOUT'
#define IOC_INOUT (IOC_IN|IOC_OUT)
^~~~~~
/usr/include/sys/ioctl.h:167:28: note: expanded from macro 'IOC_IN'
#define IOC_IN (0x40000000<<1) /* copy in parameters */
~~~~~~~~~~^ ~
```
Ref: https://curl.se/dev/log.cgi?id=20240808180420-3809007
Assisted-by: Dan Fandrich
Closes#14464
Fix FTP protocol to flush the pingpong's send buffer before receiving a
response from the server, as it may never come otherwise.
Fixes FTP/FTPS tests with `CURL_DBG_SOCK_WBLOCK=90` set.
Closes#14452
- tidy up two `MATCHES` expression by avoiding macros expansion and
adding quotes. Then convert then to `STREQUAL` to match other places
in the code doing the same checks.
- fix setting `_ALL_SOURCE` for AIX to match what autotools does.
- delete stray `_ALL_SOURCE` reference from `lib/config_riscos.h`
- simplify/fix two `STREQUAL ""` checks.
The one in the `openssl_check_symbol_exists()` macro succeeded
regardless of the value. The other could return TRUE when
`CMAKE_OSX_SYSROOT` was undefined.
- delete code for CMake versions (<3.7) we no longer support.
- prefer `LIST(APPEND ...)` to extend `CURL_LIBS`.
- use `CURL_LIBS` to add the `network` lib for Haiku.
Before this patch it was done via raw C flags. I could not test this.
- move `_WIN32_WINNT`-related code next to each other.
It also moves detection to the top, allowing more code to use
the result.
- merge two `WIN32` blocks.
- rename internal variables to underscore + lowercase.
- unwrap a line, indent, whitespace.
Closes#14450
- quote string literals.
In the hope it improves syntax-highlighting and readability.
- use lowercase, underscore-prefixed local var names.
As a hint for scope, to help readability.
- prefer `pkg_search_module` (over `pkg_check_modules`).
They are the same, but `pkg_search_module` stops searching
at the first hit.
- more `IN LISTS` in `foreach()`.
- OtherTests.cmake: clear `CMAKE_EXTRA_INCLUDE_FILES` after use.
- add `PROJECT_LABEL` for http/client and unit test targets.
- sync `Find*` module comments and formatting.
- drop a few local variables.
- drop bogus `CARES_LIBRARIES` from comment.
- unquote numeric literal.
Follow-up to acbc6b703f#14197Closes#14388
- rely on the new flush to handle blocked sends. No longer
do simulated EAGAIN on (partially) blocked sends with their
need to handle repeats.
- fix some debug handling CURL_SMALLREQSEND env var
- add some assertings in request.c for affirming we do it right
- enhance assertion output in test_16 for easier analysis
Closes#14435
```
lib/krb5.c:343:39: warning: cast from 'void **' to 'unsigned char **' increases required alignment from 2 to 8 [-Wcast-align]
(unsigned char **)&_gssresp.value,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
Seen on macOS Intel with Apple clang and brew heimdal 7.8.0_1.
Closes#14433
- make mentioning `-v` on the curl command line increase the
verbosity of the trace output
- related discussion https://github.com/curl/curl/discussions/13810
- make a single -v revert all previous -v+ changes
- make --no-verbose also reset all trace configs
Closes#13977
- sync build-dir/source-dir header path order with autotools, by
including build-dir first, then source-dir.
This prevents out-of-tree builds breaking due to leftover generated
headers in the source tree.
- tests/unit: move `src` ahead of `libtest` in header path, syncing with
autotools.
- stop adding non-existing generated `include` dir to header path.
There are no generated `include` headers and this directory is either
missing in out-of-tree builds or the same as the one already added
globally via the root `CMakeLists.txt`.
- lib: stop adding a duplicate source include directory to the header
path.
It's already added globally via the root `CMakeLists.txt`.
- lib: stop adding the project root to the header path.
- docs/examples: drop internal header paths.
Examples do not and should not use internal headers.
- replace `curl_setup_once.h` in comments with `curl_setup.h`,
the header actually used, and also referred to in autotools comments.
- add comment why we need `src` in include path for `tests/server`.
- add quotes around header directories.
Closes#14416
Replicate the method used by autotools and cmake to enable libidn2.
This way `lib/curl_setup.h` sets `USE_LIBIDN2` automatically.
Before this patch, `USE_LIBIDN2` was enabled directly, shortcutting
internal logic prioritizing IDN backends.
(This is academic now because `Makefile.mk` no longer supports
other IDN backends. But still useful for clarity.)
Closes#14421
Also use an `#undef` hack for CMake Unity builds to avoid the previously
included `memdebug.h` header messing up the declarations pulled in by
`uv.h`:
```
In file included from ~/curl/bld/src/CMakeFiles/curl.dir/Unity/unity_0_c.c:88:
In file included from ~/curl/src/tool_operate.c:54:
In file included from /usr/local/Cellar/libuv/1.48.0/include/uv.h:71:
In file included from /usr/local/Cellar/libuv/1.48.0/include/uv/unix.h:34:
/Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk/usr/include/netdb.h:269:7: error: expected parameter declarator
void freeaddrinfo(struct addrinfo *);
^
~/curl/lib/memdebug.h:167:31: note: expanded from macro 'freeaddrinfo'
curl_dbg_freeaddrinfo(data, __LINE__, __FILE__)
^
```
Follow-up to 38d334e3e1#14298Closes#14399
If a request containing two headers that have equivalent prefixes (ex.
"x-amz-meta-test:test" and "x-amz-meta-test-two:test2") AWS expects the
header with the shorter name to come first. The previous implementation
used `strcmp` on the full header. Using the example, this would result
in a comparison between the ':' and '-' chars and sort
"x-amz-meta-test-two" before "x-amz-meta-test", which produces a
different "StringToSign" than the one calculated by AWS.
Test 1976 verifies
Closes#14370
Bring setting ciphers with WolfSSL in line with other SSL backends,
to make the curl interface more consistent across the backends.
Now the tls1.3 ciphers are set with the --tls13-ciphers option, when
not set the default tls1.3 ciphers are used. The tls1.2 (1.1, 1.0)
ciphers are set with the --ciphers option, when not set the default
tls1.2 ciphers are used. The ciphers available for the connection
are now a union of the tls1.3 and tls1.2 ciphers.
This changes the behaviour for WolfSSL when --ciphers is set, but
--tls13-ciphers is not set. Now the ciphers set with --ciphers
are combined with the default tls1.3 ciphers, whereas before solely
the ciphers of --ciphers were used.
Thus before when no tls1.3 ciphers were specified in --ciphers,
tls1.3 was completely disabled. This might not be what the user
expected, especially as this does not happen with OpenSSL.
Closes#14385
Bring setting ciphers with mbedTLS in line with other SSL backends,
to make the curl interface more consistent across the backends.
Now the tls1.3 ciphers are set with the --tls13-ciphers option, when
not set the default tls1.3 ciphers are used. The tls1.2 (1.1, 1.0)
ciphers are set with the --ciphers option, when not set the default
tls1.2 ciphers are used. The ciphers available for the connection
are now a union of the tls1.3 and tls1.2 ciphers.
This changes the behaviour for mbedTLS when --ciphers is set, but
--tls13-ciphers is not set. Now the ciphers set with --ciphers
are combined with the default tls1.3 ciphers, whereas before solely
the ciphers of --ciphers were used.
Thus before when no tls1.3 ciphers were specified in --ciphers,
tls1.3 was completely disabled. This might not be what the user
expected, especially as this does not happen with OpenSSL.
Closes#14384
- replace the counting of upload lengths with the new eos send flag
- improve frequency of stream draining to happen less on events where it
is not needed
- this PR is based on #14220
http2, cf-h2-proxy: fix EAGAINed out buffer
- in adjust pollset and shutdown handling, a non-empty `ctx->outbufq`
must trigger send polling, irregardless of http/2 flow control
- in http2, fix retry handling of blocked GOAWAY frame
test case improvement:
- let client 'upload-pausing' handle http versions
Closes#14253
Improve handling of shutdown when sending gets blocked.
Add workaround for <https://github.com/wolfSSL/wolfssl/issues/7784>
where wolfSSL keeps on adding close notify messages to its outgoing
buffer on ever attempt.
Closes#14376
Make sure that `io_need` is cleared and set at the filter operations.
Add some more tracing for shutdown situations.
Improve shutdown handling for blocked sends. OpenSSL is a bit tricksy
here that it only reports WANT_WRITE on SSL_shutdown(), but never on
SSL_read() on blocked sends. So we need to use both.
At last, set SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER when available since we
are not always retrying sends from the very same address, as testing
showed.
Closes#14375
Initializes 'no_signal' to TRUE, so that a call to sigpipe_apply() after
init ignores the signal (unless CURLOPT_NOSIGNAL) is set.
I have read the existing code multiple times now and I think it gets the
initial state reversed this missing to ignore.
Regression from 17e6f06ea3
Reported-by: Rasmus Thomsen
Fixes#14344Closes#14390
wolfSSL supports setting certificates/private keys from memory blobs
which allow us to implement both CURLOPT_SSLCERT_BLOB and
CURLOPT_SSLKEY_BLOB options.
Closes#14018
Implement the `--enable-versioned-symbols` feature available in
`./configure` for CMake.
Enable with `-DCURL_LIBCURL_VERSIONED_SYMBOLS=ON`. Customize the version
prefix with `-DCURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX=MYPREFIX_`. By
default the prefix matches what autotools uses.
When enabled, the feature is detected and a warning shown if
unavailable. (E.g. on Apple and Windows, it isn't.)
Included `HIDDEN {};` to match autotools, though I don't know if it's
necessary, useful or making any difference.
Differences from the autotools implementation:
- soversion is dynamic instead of hard-coded.
- omits referencing non-curl symbols.
- allows prefix/flavour override.
- more universal feature detection.
- doesn't rely on the in-repo `lib/libcurl.vers.in` file.
Also:
- add mbedTLS and BearSSL versioned symbol prefix support to autotools.
- enable this option in an old-linux job.
Follow-up to 7cc2e8b349Fixes#14349Closes#14378
- Determine which connection cache is or will be used by the easy handle
and perform connection upkeep on that cache.
This change allows curl_easy_upkeep to be effective on easy handles that
are using a shared connection cache, either from a user created shared
connection cache or a user created multi which has its own shared
connection cache.
Prior to this change curl_easy_upkeep would upkeep the connection cache
for the easy handle only if that cache was from the multi owned by the
easy handle (ie curl_easy_perform was previously called and there's a
connection cache exclusive to the easy handle in
data->multi_easy->conn_cache).
Ref: https://curl.se/mail/lib-2024-01/0016.html
Closes https://github.com/curl/curl/pull/12677
- For HTTPS if http2-prior-knowledge is set then only offer h2 (HTTP/2)
alpn to the server for protocol negotiation.
Prior to this change both HTTP/2 ("h2") and HTTP/1.1 ("http/1.1") were
offered for ALPN when http2-prior-knowledge was set.
CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE (tool: --http2-prior-knowledge) is
meant to send non-TLS HTTP requests HTTP/2 when it is known the server
supports them. However when HTTPS is used then it attempts to first
negotiate the connection with ALPN. In that case the user likely does
not want to offer http/1.1 to the server as an acceptable protocol.
Reported-by: kit-ty-kate@users.noreply.github.com
Fixes https://github.com/curl/curl/issues/9963
Closes https://github.com/curl/curl/pull/14266
Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.
Mostly OS names and a few more.
Also a couple of other minor text fixups.
Closes#14360
