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client.c
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client.c
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#define _GNU_SOURCE
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
#include <signal.h>
#include <regex.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <fcntl.h>
pthread_t result_thread;
int pid_xterm = -2;
/* Signal handler to close external xterm window when socket closes */
void sockClosed(int signo)
{
if (signo == SIGPIPE)
{
if(pid_xterm > 0){
kill(pid_xterm, SIGTERM);
}
write(STDOUT_FILENO, "SOCKET CLOSED\n", 14);
exit(0);
}
}
/* Thread responsible for displaying output that comes in socked
* It first creates a pseudo-terminal to redirect that output to
* Then attaches it to xterm which displays the output
*/
void *result_printer(void *ptr)
{
/* Code for preparing xterm window start */
int pt = posix_openpt(O_RDWR);
if (pt == -1)
{
perror("posix_openpt");
}
char* ptname = ptsname(pt);
if (!ptname)
{
perror("ptsname");
}
if (unlockpt(pt) == -1)
{
perror("unlockpt");
}
pid_xterm = fork();
char xterm_argument[40];
int bWritten = sprintf(xterm_argument,"-S%s/%d", ptname,pt);
xterm_argument[bWritten]=0;
if(pid_xterm == 0){
execlp("xterm","xterm",xterm_argument,"-geometry", "110x65",
"-fa", "<truetype font>" ,"-fs" ,"10","-fg","green", NULL);
}
int xterm_fd1 = open(ptname,O_RDWR);
/* Code for preparing xterm window end */
int socketFd;
socketFd = *(int *)ptr;
char resBuff[1500];
int resRead = 0;
while (read(socketFd, &resBuff[resRead], 1) > 0)
{
if (resBuff[resRead] == ';')
{
if(write(xterm_fd1, resBuff, resRead) < 0){
perror("Xterm");
}
write(xterm_fd1, "\n", 1);
resBuff[resRead] = 0;
if (strcmp(resBuff, "exited\n") == 0)
{
kill(pid_xterm, SIGTERM);
close(xterm_fd1);
exit(0);
}
resRead = 0;
continue;
}
resRead++;
if (resRead >= 800)
{
write(xterm_fd1, resBuff, resRead);
resRead = 0;
}
}
if (resRead == 0 && resBuff[resRead] != ';')
{
sockClosed(SIGPIPE);
}
}
/* client method which is responsible for taking input from user
* and sending it to server
*/
int client(int socketFd)
{
signal(SIGPIPE, sockClosed);
char input[4096], operator[6];
char *token;
pthread_create(&result_thread, NULL, result_printer, (void *)&socketFd);
char supportedCommandsPrompt[] = "Supported commands:\n1)Add/Sub/Mult/Div\n2)Run\n3)List\n4)Kill\n5)Print\n6)Clear\n7)Exit\n\n";
write(STDOUT_FILENO, supportedCommandsPrompt, strlen(supportedCommandsPrompt));
char prompt[] = {"\nEnter your command:-\n"};
char inputcpy[4096];
while (true)
{
write(STDOUT_FILENO, prompt, sizeof(prompt) - 1);
int strReadSize = read(STDIN_FILENO, input, 4096);
if (strReadSize > 1)
{
input[strReadSize - 1] = 0;
strcpy(inputcpy, input);
inputcpy[strReadSize - 1] = ';';
inputcpy[strReadSize] = 0;
token = strtok(input, " ");
if (strcmp(token, "clear") == 0)
{
system("clear");
write(STDOUT_FILENO, supportedCommandsPrompt, strlen(supportedCommandsPrompt));
}
else
{
write(socketFd, inputcpy, strReadSize);
if (strcasecmp(token, "exit") == 0)
{
break;
}
else
continue;
}
}
else
{
token = "";
char incorrectInp[] = {"Incorrect input.\n"};
write(STDOUT_FILENO, incorrectInp, sizeof(incorrectInp) - 1);
continue;
}
}
pthread_join(result_thread, NULL);
return 0;
}
/* Sets up socket, connects to server and calls client method */
int main(int argc, char *argv[])
{
int sock;
struct sockaddr_in server;
struct hostent *hp;
char buf[1024];
int defaulPort = 32768;
char ipPrompt[] = "Enter server ip: ";
write(STDOUT_FILENO, ipPrompt, sizeof(ipPrompt) - 1);
char ipAdd[15];
int bread = read(STDIN_FILENO, ipAdd, 15);
ipAdd[bread - 1] = 0;
/* Create socket */
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror("opening stream socket");
exit(1);
}
/* Connect socket using name specified by command line. */
server.sin_family = AF_INET;
hp = gethostbyname(ipAdd);
if (hp == 0)
{
fprintf(stderr, "%s: unknown host\n", ipAdd);
exit(2);
}
bcopy(hp->h_addr, &server.sin_addr, hp->h_length);
server.sin_port = htons(defaulPort);
if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0)
{
perror("connecting stream socket");
exit(1);
}
int socketFd;
socketFd = sock;
client(socketFd);
close(sock);
}