stubby (getdns): needs to be compiled against WolfSSL vs OpenSSL

[birdie-github]

Maintainer: no one
Environment: (put here arch, model, OpenWrt version) 22.03.0 r19685-512e76967f , TP-Link TL-WDR3600 v1.

Description: stubby is compiled against libopenssl1.1 which is a very big package. After installing just two packages on my device, stubby and sudo, I now have just 156KB of free space which is horrible.

# opkg install stubby
Installing stubby (0.4.0-6) to root...
Downloading https://downloads.openwrt.org/releases/22.03.0/packages/mips_24kc/packages/stubby_0.4.0-6_mips_24kc.ipk
Installing libyaml (0.2.5-1) to root...
Downloading https://downloads.openwrt.org/releases/22.03.0/packages/mips_24kc/packages/libyaml_0.2.5-1_mips_24kc.ipk
Installing libopenssl1.1 (1.1.1q-1) to root...
Downloading https://downloads.openwrt.org/releases/22.03.0/packages/mips_24kc/base/libopenssl1.1_1.1.1q-1_mips_24kc.ipk
Installing getdns (1.7.0-2) to root...
Downloading https://downloads.openwrt.org/releases/22.03.0/packages/mips_24kc/packages/getdns_1.7.0-2_mips_24kc.ipk
Configuring libopenssl1.1.
Configuring getdns.
Configuring libyaml.
Configuring stubby.

# opkg install sudo
Installing sudo (1.9.10-1) to root...
Downloading https://downloads.openwrt.org/releases/22.03.0/packages/mips_24kc/packages/sudo_1.9.10-1_mips_24kc.ipk
Configuring sudo.

# df /
Filesystem           1K-blocks      Used Available Use% Mounted on
overlayfs:/overlay        2112      1956       156  93% /

I guess this is an upstream issue but I'll leave it here anyways: getdnsapi/stubby#311

[Oppen]

This is my attempt at a fix upstream since I had a similar issue: getdnsapi/getdns#552
When that's done I plan to send a PR for a separate package for getdns-mbedtls that provides getdns. Does that make sense?

In my case openssl simply does not fit the free ROM, so it was either fixing it myself or being unable to use stubby at all. It uses mbedtls rather than wolfssl, but resolves the same problem.