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simple_server.c
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simple_server.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#define PORT "3490" // the port users will be connecting to
#define BACKLOG 10 // how many pending connections queue will hold
#define MAXDATASIZE 100 // max number of bytes we can get at once
int main(void)
{
int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
struct addrinfo hints, *servinfo, *p;
struct sockaddr_in their_addr; // connector's address information
socklen_t sin_size;
int yes=1;
char s[INET6_ADDRSTRLEN];
int rv;
char buf[MAXDATASIZE];
int numbytes;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // use my IP
if ((rv = getaddrinfo(NULL, PORT, &hints, &servinfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// loop through all the results and bind to the first we can
for(p = servinfo; p != NULL; p = p->ai_next) {
if ((sockfd = socket(p->ai_family, p->ai_socktype,p->ai_protocol)) == -1) {
perror("server: socket");
continue;
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
close(sockfd);
perror("server: bind");
continue;
}
break;
}
if (p == NULL) {
fprintf(stderr, "server: failed to bind\n");
return 2;
}
freeaddrinfo(servinfo); // all done with this structure
if (listen(sockfd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
printf("server: waiting for connections...\n");
sin_size = sizeof their_addr;
while(1){
new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
if (new_fd == -1) {
perror("accept");
return;
}
inet_ntop(their_addr.sin_family,(struct sockaddr *)&their_addr.sin_addr,s, sizeof s);
printf("server: got connection from %s port: %d\n", s,their_addr.sin_port);
if ((numbytes = recv(new_fd, buf, 256, 0)) == -1) {
perror("recv");
exit(1);
}else if (numbytes == 0) {
// connection closed
printf("Client socket %s hung up\n",s );
}else{
printf("received:%s",buf);
}
if (send(new_fd, buf, numbytes, 0) == -1) {
perror("send");
}
// printf("send data: %s",buf);
// memset(buf,'\0',256);
close(new_fd); // accept socket
printf("Client socket %s closed\n",s );
}
close(sockfd); // listen socket
return 0;
}