C++ Server Connection Issue - c++

Question

Firstly, the code I will share is the basis of my code(found it in another site, open source), I added functions and threads later to improve.
In the office, we have local network and another 3 computer cannot connect to my server. Especially have a look at that line. 26010 is random port number that I want to listen. According to data I found in the other topics, NULL and 127.0.0.1 are the localhost ip.I tried my own ip number instead of NULL, but it didn't work. I can send data from my client code to other computers, but can't get any connections.
Code is listening connections properly, and can get info if I open another 3 terminal and try to connect it from my computer through my client code. How to fix that?
Thanks in advance.
status = getaddrinfo(NULL, "26010", &host_info, &host_info_list);
int main()
{
int status;
struct addrinfo host_info; // The struct that getaddrinfo() fills up with data.
struct addrinfo *host_info_list; // Pointer to the to the linked list of host_info's.
memset(&host_info, 0, sizeof host_info);
std::cout << "Setting up the structs..." << std::endl;
host_info.ai_family = AF_UNSPEC; // IP version not specified. Can be both.
host_info.ai_socktype = SOCK_STREAM; // Use SOCK_STREAM for TCP or SOCK_DGRAM for UDP.
host_info.ai_flags = AI_PASSIVE;
**status = getaddrinfo(NULL, "26010", &host_info, &host_info_list);**
// getaddrinfo returns 0 on succes, or some other value when an error occured.
// (translated into human readable text by the gai_gai_strerror function).
if (status != 0) std::cout << "getaddrinfo error" << gai_strerror(status) ;
std::cout << "Creating a socket..." << std::endl;
int socketfd ; // The socket descripter
socketfd = socket(host_info_list->ai_family, host_info_list->ai_socktype,
host_info_list->ai_protocol);
if (socketfd == -1) std::cout << "socket error " ;
std::cout << "Binding socket..." << std::endl;
int yes = 1;
status = setsockopt(socketfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
status = bind(socketfd, host_info_list->ai_addr, host_info_list->ai_addrlen);
if (status == -1) std::cout << "bind error" << std::endl ;
std::cout << "Listen()ing for connections..." << std::endl;
status = listen(socketfd, 5);
if (status == -1) std::cout << "listen error" << std::endl ;
int new_sd;
struct sockaddr_storage their_addr;
socklen_t addr_size = sizeof(their_addr);
new_sd = accept(socketfd, (struct sockaddr *)&their_addr, &addr_size);
if (new_sd == -1)
{
std::cout << "listen error" << std::endl ;
}
else
{
std::cout << "Connection accepted. Using new socketfd : " << new_sd << std::endl;
}
std::cout << "Waiting to recieve data..." << std::endl;
ssize_t bytes_recieved;
char incomming_data_buffer[1000];
bytes_recieved = recv(new_sd, incomming_data_buffer,1000, 0);
// If no data arrives, the program will just wait here until some data arrives.
...
std::cout << "send()ing back a message..." << std::endl;
return 0 ;
}

Answer 1

Your problem is your call to getaddrinfo(). This function returns information in the host_info_list member. What you're reading is the hint (host_info) which is not changed by getaddrinfo(). You would need to use host_info_list to read the what's returned by getaddrinfo. You never use it and you never free it (by calling freeaddrinfo).
I am not sure why you'd want to use getaddrinfo() to listen for connection. You can just build the sockaddr yourself. It's easy:
struct sockaddr_in listenAddr;
memset(&listenAddr, 0, sizeof(listenAddr));
/* IPv4 address */
listenAddr.sin_family = AF_INET;
/* your port number */
listenAddr.sin_port = htons(26010);
/* listen on all interfaces */
listenAddr.sin_addr.s_addr = htonl(INADDR_ANY);
/* TCP socket */
socketfd = socket(PF_INET, SOCK_STREAM, 0);
/* your error code, omitted here */
status = bind(SocketFD,(struct sockaddr *) &listenAddr, sizeof(listenAddr))