Change #266605

Comments

ECH: cleanups

- passing an unknown string to CURLOPT_ECH now returns error

  To properly allow applications to spot if they pass in a typo or
  something to libcurl.

- CURLECH_DISABLE is now a plain zero internally, not a dedicated bit which
  simplifies checks for when ECH is enabled

- Dropped the CURLECH_CLA_CFG bit, and just check STRING_ECH_CONFIG

- Turn grease/enable/hard into three different numerical values, no bitmask
  needed

- Convert the struct field 'tls_ech' from an int to a byte.

Closes #21532

Changed files

• lib/setopt.c
• lib/urldata.h
• lib/vtls/openssl.c
• lib/vtls/rustls.c
• lib/vtls/vtls.h
• lib/vtls/wolfssl.c
• tests/libtest/mk-lib1521.pl