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client.c
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84 lines (70 loc) · 1.97 KB
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/* TCP client
* August 15, 2021 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#define BUF 256
#define PORT 5001
/* Execute like this to connect to server:
* $ ./client 127.0.0.1 5001 */
int main(int argc, char **argv) {
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char hostname[BUF];
char buffer[BUF];
portno = ((argc < 3) ? PORT : atoi(argv[2]));
bzero(hostname, BUF);
sprintf(hostname, "%s", ((argc < 2) ? "127.0.0.1" : argv[1]));
if (argc < 3) {
printf("Using default port %d\n", PORT);
}
if (argc < 2) {
printf("Using default host 127.0.0.1\n");
}
/* create a socket point */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
fprintf(stderr, "Error opening socket\n");
return 1;
}
if (!(server = gethostbyname(hostname))) {
fprintf(stderr, "Error: No such host '%s'\n", hostname);
return 2;
}
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);
/* connect to the server */
if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
fprintf(stderr, "Error connecting\n");
return 3;
}
/* ask for a message from the user, this message will be read by the server */
printf("Please enter a message for the server: ");
bzero(buffer, BUF);
fgets(buffer, BUF, stdin);
/* send message to the server */
if ((n = write(sockfd, buffer, strlen(buffer))) < 0) {
fprintf(stderr, "Error writing to socket\n");
return 4;
} else {
printf("Wrote %d bytes\n", n);
}
/* now read server response */
bzero(buffer, BUF);
if ((n = read(sockfd, buffer, BUF-1)) < 0) {
fprintf(stderr, "Error reading from socket\n");
return 4;
} else {
printf("Read %d bytes\n", n);
}
close(sockfd);
printf("Your message: %s", buffer);
return 0;
}