Feature Request: Make fakeip-ttl Configurable

[Medium1992]

Please add a configurable fakeip-ttl.
In some setups the default value of 1 second causes freezes. I had to rebuild the binary with ENV FAKEIP_TTL so I could set it to something other than 1 — I’m using 10 seconds without issues. After switching back to the original binary, the freezes returned (e.g., YouTube hangs completely).

My setup: Mihomo in fakeip mode, while Mikrotik sends DNS requests via DNS static FWD. In configurations where clients don’t receive Mihomo’s DNS directly, DNS static forwarding is very convenient — but the 1-second TTL breaks everything. Looks like I’ll have to patch it again.

Example patch from Dockerfile

# --- Добавляем helper-файл в пакет dns ---
RUN cat > dns/envttl.go <<'EOF'
package dns

import (
  "os"
  "strconv"
)

func fakeipTTL() int {
  if v := os.Getenv("TTL_FAKEIP"); v != "" {
    if i, err := strconv.Atoi(v); err == nil && i > 0 {
      return i
    }
  }
  return 1
}
EOF

# --- Патчим middleware.go: setMsgTTL(msg, 1) -> setMsgTTL(msg, uint32(fakeipTTL())) ---
RUN awk 'BEGIN{done=0} { \
  if(!done && $0 ~ /setMsgTTL\([[:space:]]*msg,[[:space:]]*1[[:space:]]*\)/){ \
    sub(/setMsgTTL\([[:space:]]*msg,[[:space:]]*1[[:space:]]*\)/, "setMsgTTL(msg, uint32(fakeipTTL()))"); done=1 \
  } \
  print \
} END { if(done==0){ exit 1 } }' dns/middleware.go > /tmp/mw.go && \
    mv /tmp/mw.go dns/middleware.go && \
    grep -q 'setMsgTTL(msg, uint32(fakeipTTL()))' dns/middleware.go

[wwqgtxx]

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