Created
March 29, 2016 01:54
-
-
Save evanharmon/ddfa2f0850a29fc81879 to your computer and use it in GitHub Desktop.
SImple base client in C
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <netdb.h> | |
| #include <netinet/in.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| /* adapted from http://www.cs.rpi.edu/~moorthy/Courses/os98/Pgms/socket.html */ | |
| int main(int argc, char *argv[]) { | |
| int sockfd, portno, n; | |
| struct sockaddr_in serv_addr; | |
| struct hostent *server; | |
| char buffer[256]; | |
| if (argc < 3) { | |
| fprintf(stderr, "usage %s hostname port\n", argv[0]); | |
| exit(0); | |
| } | |
| portno = atoi(argv[2]); | |
| /* Create a socket point */ | |
| sockfd = socket(AF_INET, SOCK_STREAM, 0); | |
| if (sockfd < 0) { | |
| perror("Error opening socket"); | |
| exit(1); | |
| } | |
| server = gethostbyname(argv[1]); | |
| if (server == NULL) { | |
| fprintf(stderr, "Error, no such host\n"); | |
| exit(0); | |
| } | |
| 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 server */ | |
| if (connect(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0) { | |
| perror("Error connecting"); | |
| exit(1); | |
| } | |
| /* Ask for message from user, will be read on server */ | |
| printf("Please enter the message: "); | |
| bzero(buffer, 256); | |
| fgets(buffer, 255, stdin); | |
| /* Send message to server */ | |
| n = write(sockfd, buffer, strlen(buffer)); | |
| if (n < 0) { | |
| perror("Error writing to socket"); | |
| exit(1); | |
| } | |
| /* Read response from server */ | |
| bzero(buffer, 265); | |
| n = read(sockfd, buffer, 255); | |
| if (n < 0) { | |
| perror("Error writing to socket"); | |
| exit(1); | |
| } | |
| printf("%s\n", buffer); | |
| return 0; | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment