net: add new method Sock::GetSockName() that wraps getsockname()

This will help to increase `Sock` usage and make more code mockable.

5 files changed, 34 insertions, 0 deletions

diff --git a/src/test/fuzz/util.cpp b/src/test/fuzz/util.cpp
index 883698aff1..76a85b7a13 100644
--- a/src/test/fuzz/util.cpp
+++ b/src/test/fuzz/util.cpp
@@ -206,6 +206,20 @@ int FuzzedSock::SetSockOpt(int, int, const void*, socklen_t) const
     return 0;
 }
 
+int FuzzedSock::GetSockName(sockaddr* name, socklen_t* name_len) const
+{
+    constexpr std::array getsockname_errnos{
+        ECONNRESET,
+        ENOBUFS,
+    };
+    if (m_fuzzed_data_provider.ConsumeBool()) {
+        SetFuzzedErrNo(m_fuzzed_data_provider, getsockname_errnos);
+        return -1;
+    }
+    *name_len = m_fuzzed_data_provider.ConsumeData(name, *name_len);
+    return 0;
+}
+
 bool FuzzedSock::Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred) const
 {
     constexpr std::array wait_errnos{
diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
index 66d00b1767..9ac7347d8b 100644
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -69,6 +69,8 @@ public:
 
     int SetSockOpt(int level, int opt_name, const void* opt_val, socklen_t opt_len) const override;
 
+    int GetSockName(sockaddr* name, socklen_t* name_len) const override;
+
     bool Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred = nullptr) const override;
 
     bool WaitMany(std::chrono::milliseconds timeout, EventsPerSock& events_per_sock) const override;
diff --git a/src/test/util/net.h b/src/test/util/net.h
index 37d278645a..ec3c2894ce 100644
--- a/src/test/util/net.h
+++ b/src/test/util/net.h
@@ -152,6 +152,12 @@ public:
 
     int SetSockOpt(int, int, const void*, socklen_t) const override { return 0; }
 
+    int GetSockName(sockaddr* name, socklen_t* name_len) const override
+    {
+        std::memset(name, 0x0, *name_len);
+        return 0;
+    }
+
     bool Wait(std::chrono::milliseconds timeout,
               Event requested,
               Event* occurred = nullptr) const override
diff --git a/src/util/sock.cpp b/src/util/sock.cpp
index 7d5069423a..b4c0aa4205 100644
--- a/src/util/sock.cpp
+++ b/src/util/sock.cpp
@@ -111,6 +111,11 @@ int Sock::SetSockOpt(int level, int opt_name, const void* opt_val, socklen_t opt
     return setsockopt(m_socket, level, opt_name, static_cast<const char*>(opt_val), opt_len);
 }
 
+int Sock::GetSockName(sockaddr* name, socklen_t* name_len) const
+{
+    return getsockname(m_socket, name, name_len);
+}
+
 bool Sock::Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred) const
 {
     // We need a `shared_ptr` owning `this` for `WaitMany()`, but don't want
diff --git a/src/util/sock.h b/src/util/sock.h
index 3245820995..96d0b3b56b 100644
--- a/src/util/sock.h
+++ b/src/util/sock.h
@@ -126,6 +126,13 @@ public:
                                          const void* opt_val,
                                          socklen_t opt_len) const;
 
+    /**
+     * getsockname(2) wrapper. Equivalent to
+     * `getsockname(this->Get(), name, name_len)`. Code that uses this
+     * wrapper can be unit tested if this method is overridden by a mock Sock implementation.
+     */
+    [[nodiscard]] virtual int GetSockName(sockaddr* name, socklen_t* name_len) const;
+
     using Event = uint8_t;
 
     /**