feat: implement local IP address retrieval function

fixes: #1381

- Add a function to get all local IP addresses

Signed-off-by: Zewen Xu <zevin9427@gmail.com>

src/cluster/cluster.cc

@@ -26,7 +26,9 @@
 #include <cstring>
 #include <fstream>
 #include <memory>
-
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <arpa/inet.h>
 #include "commands/commander.h"
 #include "fmt/format.h"
 #include "parse_util.h"
@@ -157,7 +159,34 @@ Status Cluster::SetSlot(int slot, const std::string &node_id, int64_t new_versio
 
   return Status::OK();
 }
+// Get all local IP addresses.
+std::vector<std::string> getLocalIPAddresses() {
+  std::vector<std::string> ipAddresses;
+
+  struct ifaddrs *ifAddrStruct = NULL;
+  struct ifaddrs *ifa = NULL;
+  void *tmpAddrPtr = NULL;
+
+  getifaddrs(&ifAddrStruct);
 
+  for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
+    if (!ifa->ifa_addr) {
+      continue;
+    }
+    if (ifa->ifa_addr->sa_family == AF_INET) {
+      // check it is IP4 and not a loopback address
+      tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
+      char addressBuffer[INET_ADDRSTRLEN];
+      inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
+      std::string ipAddress(addressBuffer);
+      ipAddresses.push_back(move(ipAddress));
+    }
+  }
+
+  if (ifAddrStruct != NULL) freeifaddrs(ifAddrStruct);
+
+  return ipAddresses;
+}
 // cluster setnodes $all_nodes_info $version $force
 // one line of $all_nodes: $node_id $host $port $role $master_node_id $slot_range
 Status Cluster::SetClusterNodes(const std::string &nodes_str, int64_t version, bool force) {
@@ -201,14 +230,20 @@ Status Cluster::SetClusterNodes(const std::string &nodes_str, int64_t version, b
   }
 
   // Find myself
+  // Get all local IP addresses.
+  std::vector<std::string> localhost = getLocalIPAddresses();
   if (myid_.empty() || force) {
     for (auto &n : nodes_) {
-      if (n.second->port == port_ && std::find(binds_.begin(), binds_.end(), n.second->host) != binds_.end()) {
-        myid_ = n.first;
+      //If the IP being listened on is 0.0.0.0, we need to compare the node's IP address with all local IP addresses.
+      if (n.second->port == port_ &&
+          (std::find(binds_.begin(), binds_.end(), n.second->host) != binds_.end() ||
+           std::find(localhost.begin(), localhost.end(), n.second->host) != localhost.end())) {
+        myid_ = n.first;  
         break;
       }
     }
   }
+
   myself_ = nullptr;
   if (!myid_.empty() && nodes_.find(myid_) != nodes_.end()) {
     myself_ = nodes_[myid_];