Created
April 27, 2017 14:01
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#include <stdio.h> | |
#include <sys/types.h> | |
#include <sys/socket.h> | |
#include <netinet/in.h> | |
#include <netdb.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
void error(char *msg) | |
{ | |
perror(msg); | |
exit(0); | |
} | |
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]); | |
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\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); | |
if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) | |
error("ERROR connecting"); | |
printf("Please enter the message: "); | |
bzero(buffer,256); | |
fgets(buffer,255,stdin); | |
n = write(sockfd,buffer,strlen(buffer)); | |
if (n < 0) | |
error("ERROR writing to socket"); | |
bzero(buffer,256); | |
n = read(sockfd,buffer,255); | |
if (n < 0) | |
error("ERROR reading from socket"); | |
printf("%s\n",buffer); | |
return 0; | |
} |
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