Merge bitcoin/bitcoin#30230: fuzz: add I2P harness

193c748e44f8647a056121fc9cbb9c2efbcbfc49 fuzz: add I2P harness (marcofleon)

Pull request description:

  Addresses https://github.com/bitcoin/bitcoin/issues/28803. This updated harness sets mock time at the beginning of each iteration and deletes the private key file at the end of each iteration. Mock time is used to make the fuzz test more stable, as `GetTime` is called at points in `i2p`. Deleting the private key file ensures that each iteration is independent from the last. Now, a new key is generated in `i2p` every time, so the fuzzer can eventually make progress through the target code.

  Re-working this harness also led me and dergoegge to resolve a couple of issues in `FuzzedSock`, which allows for full coverage of the `i2p` code. Those changes can be seen in https://github.com/bitcoin/bitcoin/pull/30211.

  The SAM protocol for interacting with I2P requires some specifc inputs so it's best to use a dictionary when running this harness.

  <details>
  <summary>I2P dict</summary>

  ```
  "HELLO VERSION"
  "HELLO REPLY RESULT=OK VERSION="
  "HELLO REPLY RESULT=NOVERSION"
  "HELLO REPLY RESULT=I2P_ERROR"
  "SESSION CREATE"
  "SESSION STATUS RESULT=OK DESTINATION="
  "SESSION STATUS RESULT=DUPLICATED_ID"
  "SESSION STATUS RESULT=DUPLICATED_DEST"
  "SESSION STATUS RESULT=INVALID_ID"
  "SESSION STATUS RESULT=INVALID_KEY"
  "SESSION STATUS RESULT=I2P_ERROR MESSAGE="
  "SESSION ADD"
  "SESSION REMOVE"
  "STREAM CONNECT"
  "STREAM STATUS RESULT=OK"
  "STREAM STATUS RESULT=INVALID_ID"
  "STREAM STATUS RESULT=INVALID_KEY"
  "STREAM STATUS RESULT=CANT_REACH_PEER"
  "STREAM STATUS RESULT=I2P_ERROR MESSAGE="
  "STREAM ACCEPT"
  "STREAM FORWARD"
  "DATAGRAM SEND"
  "RAW SEND"
  "DEST GENERATE"
  "DEST REPLY PUB= PRIV="
  "DEST REPLY RESULT=I2P_ERROR"
  "NAMING LOOKUP"
  "NAMING REPLY RESULT=OK NAME= VALUE="
  "DATAGRAM RECEIVED DESTINATION= SIZE="
  "RAW RECEIVED SIZE="
  "NAMING REPLY RESULT=INVALID_KEY NAME="
  "NAMING REPLY RESULT=KEY_NOT_FOUND NAME="
  "MIN"
  "MAX"
  "STYLE"
  "ID"
  "SILENT"
  "DESTINATION"
  "NAME"
  "SIGNATURE_TYPE"
  "CRYPTO_TYPE"
  "SIZE"
  "HOST"
  "PORT"
  "FROM_PORT"
  "TRANSIENT"
  "STREAM"
  "DATAGRAM"
  "RAW"
  "MASTER"
  "true"
  "false"
  ```

  </details>

  I'll add this dict to qa-assets later on.

ACKs for top commit:
  dergoegge:
    tACK 193c748e44f8647a056121fc9cbb9c2efbcbfc49
  brunoerg:
    ACK 193c748e44f8647a056121fc9cbb9c2efbcbfc49
  vasild:
    ACK 193c748e44f8647a056121fc9cbb9c2efbcbfc49

Tree-SHA512: 09ae4b3fa0738aa6f159f4d920493bdbce786b489bc8148e7a135a881e9dba93d727b40f5400c9510e218dd2cfdccc7ce2d3ac9450654fb29c78aac59af92ec3

1 files changed, 1 insertions, 0 deletions

diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index bde62a1502..c41faa117d 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -328,6 +328,7 @@ test_fuzz_fuzz_SOURCES = \
  test/fuzz/headerssync.cpp \
  test/fuzz/hex.cpp \
  test/fuzz/http_request.cpp \
+ test/fuzz/i2p.cpp \
  test/fuzz/integer.cpp \
  test/fuzz/key.cpp \
  test/fuzz/key_io.cpp \