Basic interface for using libnl3 (for interface monitoring)

Makefile

@@ -16,6 +16,9 @@ CFLAGS += -Wno-error=sign-conversion
 CXXFLAGS += -Wno-error=sign-conversion
 endif
 
+CFLAGS += `pkg-config --cflags libnl-3.0`
+CXXFLAGS += `pkg-config --cflags libnl-3.0`
+
 CC ?= gcc
 CXX ?= g++
 

src/app/mumta.cpp

@@ -4,6 +4,7 @@
 #include <thread>
 
 #include "lib/ev/ev.hpp"
+#include "lib/nl/nl.hpp"
 
 #include "mumta/evloop.hpp"
 
@@ -14,6 +15,9 @@ int main() {
     if(!check_version_libev()) {
         return 1;
     }
+    if (!check_version_libnl()) {
+        return 1;
+    }
 
     dctl_status_msg("Initializing");
     dctl_status_msg("Reading configuration");

src/app/mumta.ldflags

 `pkg-config --cflags --libs libsystemd`
+`pkg-config --cflags --libs libnl-3.0`
 -lev
 -pthread

src/lib/nl/nl.cpp

+#include <lib/nl/nl.hpp>
+
+#include <iomanip>
+#include <sstream>
+#include <string>
+
+#include <netlink/utils.h>
+
+#include "service/daemonctl.hpp"
+
+bool check_version_libnl()
+{
+    auto nl_major{nl_ver_maj};
+    auto nl_minor{nl_ver_min};
+
+    constexpr auto exp_major{LIBNL_VER_MAJ};
+    constexpr auto exp_minor{LIBNL_VER_MIN};
+
+    std::stringstream str;
+    str << "Checking dependency: libnl: detected " << std::dec << nl_major << "." << std::setw(2) << std::setfill('0') << nl_minor << ", compiled " << std::dec << exp_major << "." << std::setw(2) << std::setfill('0') << exp_minor;
+    dctl_status_msg(str.str().c_str());
+
+    if (nl_major != exp_major) {
+        dctl_status_err("Checking dependency: libnl: failed version check: Major API version mismatch.\n");
+        return false;
+    }
+
+    if (nl_minor < exp_minor) {
+        dctl_status_err("Checking dependency: libnl: failed version check: Minor API version too old.\n");
+        return false;
+    }
+
+    return true;
+}

src/lib/nl/nl.hpp

+#pragma once
+
+bool check_version_libnl();