Extract IP from connection that listen and accept in socket programming in Linux in c

Question

In the following code I would like to extract the IP address of the connected client after accepting an incoming connection. What should I do after the accept() to achieve it?

int sockfd, newsockfd, portno, clilen;
portno = 8090;
clilen = 0;
pthread_t serverIn;
struct sockaddr_in serv_addr, cli_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
    perror("ERROR opening socket");
}
bzero((char *) & serv_addr, sizeof (serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(portno);
serv_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sockfd, (struct sockaddr *) & serv_addr, sizeof (serv_addr)) < 0)
{
    perror("ERROR on binding");
}

listen(sockfd, 5);
clilen = sizeof (cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) & cli_addr, &clilen);

Answer 1

getpeername()

See the helpful description of how to use it over at the indispensable Beej's Guide to Network Programming.

Answer 2

Your cli_addr already contains the IP address and port of the connected client after accept() returns successfully, in the same format as your serv_addr variable. Use inet_ntop to convert IP to a string.