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client.c
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client.c
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#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define BUFFER_SIZE 256
#define MAX_CLIENT 5
void error(const char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
if (argc < 3) {
fprintf(stderr, "port no not provided. program terminated\n");
exit(1);
}
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[BUFFER_SIZE];
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
error("error opening socket");
}
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr, "error no such host");
}
bzero((char *)&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
// copy n bytes from *server to serv_addr
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) {
error("socket failed to connect ");
}
while (1) {
bzero(buffer, 255);
fgets(buffer, 255, stdin);
n = write(sockfd, buffer, strlen(buffer));
if (n < 0) {
error("error on writing");
}
bzero(buffer, 255);
n = read(sockfd, buffer, 255);
if (n < 0) {
error("error while reading");
}
printf("server: %s", buffer);
int i = strncmp("bye", buffer, 3);
if (i == 0) {
break;
}
}
close(sockfd);
return 0;
}