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client.c
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client.c
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#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <poll.h>
#define PORT (22000)
#define MAXMESSAGE (512)
//message type, sender, message, newline and a null character.
#define MAXBUFFER (1+1+MAXMESSAGE+1+1)
#define MAX_USER (16)
#define MAX_NAME (20)
#define TIMEOUT (1024 * 1024)
#define POLL_ERR (-1)
#define POLL_EXPIRE (0)
//Message types
#define USERNAME (1)
#define MESSAGE (2)
#define DISCONNECT (3 )
int main(int argc,char **argv)
{
int i, j = 0;
char buffer[MAXBUFFER];
memset(buffer, 0, MAXBUFFER);
char UserNames[MAX_USER][MAX_NAME+1]; // +1 = null terminator
memset(UserNames, 0, MAX_USER*(MAX_NAME+1));
struct pollfd pfds[2];
pfds[0].fd = 0; // 0 = stdin
pfds[0].events = POLLIN;
pfds[1].events = POLLIN;
struct sockaddr_in servaddr;
pfds[1].fd = socket(AF_INET,SOCK_STREAM,0);
bzero(&servaddr,sizeof servaddr);
servaddr.sin_family=AF_INET;
servaddr.sin_port=htons(22000);
char ServerAddressString[16] = "127.0.0.1";
if(argc > 1)
{
int VarLength = strlen(argv[1]);
for(int i = 0; i < 16; i++)
{
if(i < VarLength)
{
ServerAddressString[i] = argv[1][i];
}
else
{
ServerAddressString[i] = '\0';
}
}
}
inet_pton(AF_INET, ServerAddressString, &(servaddr.sin_addr));
connect(pfds[1].fd,(struct sockaddr *)&servaddr,sizeof(servaddr));
printf("Set user name:\n");
fgets((buffer + 2),MAX_NAME,stdin); //stdin = 0
buffer[0] = USERNAME;
buffer[1] = 1; // 1 = not null. This is here to make the server have a spot to mark userid.
write(pfds[1].fd,buffer,strlen(buffer)+1);
while(1)
{
j = poll(pfds, 2u, TIMEOUT);
switch( j )
{
case POLL_EXPIRE:
printf("Timeout has expired !\n");
break;
case POLL_ERR:
perror("Error on poll");
default:
//Send message
if(pfds[0].revents & POLLIN)
{
while(1) //loop until all splits of message are sent.
{
memset(buffer, 0, MAXBUFFER);
buffer[0] = MESSAGE;
buffer[1] = 1; // 1 = not null. This is here to make the server have a spot to mark userid.
fgets((buffer + 2),MAXMESSAGE+1,stdin); // +1 = null characters, stdin = 0
if(buffer[MAXBUFFER-3] != '\n' && buffer[MAXBUFFER-3] != 0) //max or more length, include the new line manually
{
buffer[MAXBUFFER-2] = '\n';
buffer[MAXBUFFER-1] = '\0';
write(pfds[1].fd,buffer,strlen(buffer)+1);
}
else //Message short => it is the last one.
{
write(pfds[1].fd,buffer,strlen(buffer)+1);
break;
}
}
}
//Receive message
if(pfds[1].revents & POLLIN)
{
memset(buffer, 0, MAXBUFFER);
read(pfds[1].fd, buffer, MAXBUFFER);
switch(buffer[0])
{
case MESSAGE:
printf("%s: %s", UserNames[buffer[1]-1], &(buffer[2]));
break;
case USERNAME: ;
int index = 0;
while(index < MAXBUFFER && buffer[index] != 0)
{
//If we don't cleanup we might leave a portion of the old name if the new one is shorter
memset(UserNames[buffer[index + 1]-1], 0, MAX_NAME+1);
//this leaves out the newline
for(int i = 0; i < MAX_NAME && i < strlen(&buffer[index + 2])-1; i++)
{
UserNames[buffer[index + 1]-1][i] = buffer[index + 2 + i];
}
printf("%s has entered the chat\n", UserNames[buffer[index + 1]-1]);
index += strlen(buffer + index)+1;
}
break;
case DISCONNECT:
printf("%s has left the chat\n", UserNames[buffer[1]-1]);
break;
default:
printf("WARNING: UNKOWN MESSAGE TYPE; %i\n ", buffer[0]);
break;
}
}
} //Switch
} //While
}