message from client to server in C - c

Question

I have such a task, I need to write the “client” code so that the message from the “client” is sent to the server (which was created by my teacher, ip “127.0.0.1”). After the message arrives at the server (for example, “Nursultan Nazarbayev”, the server will reply “ok” and the client should send “quit”)
I'm just learning C. How to make a break with the server? I wanted to send "quit", but this did not work, there was a constant error, how can I do this?
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char **argv)
{
char message[2048];//=(char*)malloc(sizeof(char));// transmission message
char buf[sizeof(message)];
int port,ch;
//----------------------------------------------------------------------------
if(argc!=3){
printf("Wrong number of arguments!\nThere must be 2 arguments (Port, server ip-address)!\n");
exit(0);
}
int sock; // socket descriptor
struct sockaddr_in addr; // structure with address
struct hostent* hostinfo;
port = atoi(argv[1]);
hostinfo = argv[2];
sock = socket(AF_INET, SOCK_STREAM, 0); // create TCP socket
if(sock < 0)
{
perror("socket");
exit(1);
}
// Specify server parameters
addr.sin_family = AF_INET; // Internet domains
addr.sin_port = htons(port); // or any other port ...
addr.sin_addr.s_addr=inet_addr("hostinfo");
// addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
//addr.sin_addr.s_addr = inet_addr(host_ip);
if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) // establishing a connection to the server
{
perror("Connection");
exit(2);
}
while(1){//WHILE <---
//----------------------------------------------------------------------------
printf("Enter a message to the server (To exit: quit): ");
if (!strcmp(gets(message), "quit")){close(sock);return 0;}
//----------------------------------------------------------------------------
printf("sending a message to the server...\n");
send(sock, message, sizeof(message), 0); // sending a message to the server
int bytes_read = 0;
printf("Message Waiting\n");
bytes_read = recv(sock, buf, sizeof(message), 0);
printf("received %d bytes\tMessage: %s\n", bytes_read, buf); // receiving a message from the server
}//END_WHILE
return 0;
}

Answer 1

This probably is wrong:
addr.sin_addr.s_addr=inet_addr("hostinfo");
You are passing the literal string, "hostinfo" to the inet_addr() function. Meanwhile, you have a variable named hostinfo, to which you assign a string value, but you never use it anywhere in the program.
Maybe you meant to do this instead:
addr.sin_addr.s_addr=inet_addr(hostinfo);
P.S., I like long, descriptive names. If that was my program, the name of the variable would be something like, server_address_as_string.