Getting info on a client when they connect to the server

[Finchie_88]

I'm writing some server code at the moment, and was wondering if there was a function that will give me some information on the client connected, like the IP and connection speed they are running at.

[kuphryn]

One solution to determining the remote socket IP is via getpeername() and getnameinfo().

Kuphryn

[Quantum1024]

You can also have accept() fill a buffer with the address of the connecting client.

[xErath]

you can't know the peer's connection speed unless you try to flood the peer and check the amount of data sent (very bad !) plus, that result wouldn't be, in any way, accurate, because speed always varies a bit, and the client may have other programs using his line.
when you do connect() you know the ip and port, of course. when accepting connections where's a small and accurate example, to the get the ip of the peer

//you may want this for better portability
#ifndef WIN32
typedef int SOCKET;
#define closesocket close
#endif


//get your socket
SOCKET sock = socket(AF_INET,SOCK_STREAM,IPPROTO_IP);//you can and should use 0 instead, in the 3rd parameter

//setup for listening incoming connections
struct sockaddr_in my_info;
my_info.sin_family = AF_INET;
my_info.sin_addr.s_addr = htonl(INADDR_ANY);	
my_info.sin_port = htons(80);//HTTP perhaps ? :P
bind(sock,(struct sockaddr *)&my_info,sizeof(struct sockaddr_in));
listen(sock,4);

//now try to accept a peer's connection
socklen_t sizeof_sockaddr = sizeof(struct sockaddr_in);
sockaddr_in peer_info;
SOCKET new_sock = accept(sock,(struct sockaddr*)&peer_info,&sizeof_sockaddr)

printf("the peer's adress is %s\n",inet_ntoa(peer_info.sin_adr.s_addr));

closesocket(sock);
closesocket(new_sock);

[rajatkochhar]

For getting host Ip address , port number,name and other
parameters one can use functions like:

1.gethostbyaddr
2.gethostbyname
3.getservbyname
4.getservbyport
These database functions are defined in the interface header
file netdb.h