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client_functions.c
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client_functions.c
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#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include "client_functions.h"
void error(const char *msg) {
perror(msg);
exit(-1);
}
void send_to_server(int sockfd, const char *msg) {
// lets send number of bytes we want to send
int length = strlen(msg);
char *len_text = calloc(9, 1);
sprintf(len_text, "%08d", length);
if (write(sockfd, len_text, 8) < 0)
error("ERROR writing");
free(len_text);
// and only then send this number of bytes
if (write(sockfd, msg, length) < 0)
error("ERROR writing");
}
int setup_socket(char *hostname, int portno) {
struct hostent *server;
struct sockaddr_in serv_addr;
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
fprintf(stderr, "ERROR opening socket\n");
return -1;
}
server = gethostbyname(hostname);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
return -1;
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) {
fprintf(stderr, "ERROR connecting\n");
return -1;
}
return sockfd;
}