/*-----------------------------------------------------------------------
*
* Program: chatclient
* Purpose: contact a chatserver and allow users to chat
* Usage: chatclient <compname> <appnum>
*
*-----------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
computer comp;
connection conn;
char buff[BUFFSIZE];
int len;
if (argc != 3) {
(void) fprintf(stderr, "usage: %s <compname> <appnum>\n",
argv[0]);
exit(1);
}
/* convert the compname to binary form comp */
comp = cname_to_comp(argv[1]);
if (comp == -1)
exit(1);
/* make a connection to the chatserver */
conn = make_contact(comp, (appnum) atoi(argv[2]));
if (conn < 0)
exit(1);
(void) printf("Chat Connection Established.\n");
(void) printf(INPUT_PROMPT);
(void) fflush(stdout);
/* iterate, reading from local user and then from chatserver */
while((len = readln(buff, BUFFSIZE)) > 0) {
buff[len - 1] = '\n';
(void) send(conn, buff, len, 0);
/* receive and print a line from the chatserver */
if ((len = recvln(conn, buff, BUFFSIZE)) < 1)
break;
(void) printf(RECEIVED_PROMPT);
(void) fflush(stdout);
(void) write(STDOUT_FILENO, buff, len);
(void) printf(INPUT_PROMPT);
(void) fflush(stdout);
}
/* iteration ends when stdin or the connection indicates EOF */
(void) printf("\nChat Connection Closed.\n");
(void) send_eof(conn);
exit(0);
}
/*-----------------------------------------------------------------------
*
* Program: echoclient
* Purpose: contact echoserver, send user input and print server response
* Usage: echoclient <compname> [appnum]
* Note: Appnum is optional. If not specified the standard echo appnum
* (7) is used.
*
*-----------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
computer comp;
appnum app;
connection conn;
char buff[BUFFSIZE];
int expect, received, len;
if (argc < 2 || argc > 3) {
(void) fprintf(stderr, "usage: %s <compname> [appnum]\n",
argv[0]);
exit(1);
}
/* convert the arguments to binary format comp and appnum */
comp = cname_to_comp(argv[1]);
if (comp == -1)
exit(1);
if (argc == 3)
app = (appnum) atoi(argv[2]);
else if ((app = appname_to_appnum("echo")) == -1)
exit(1);
/* form a connection with the echoserver */
conn = make_contact(comp, app);
if (conn < 0)
exit(1);
(void) printf(INPUT_PROMPT);
(void) fflush(stdout);
/* iterate: read input from the user, send to the server, */
/* receive reply from the server, and display for user */
while((len = readln(buff, BUFFSIZE)) > 0) {
/* send the input to the echoserver */
(void) send(conn, buff, len, 0);
(void) printf(RECEIVED_PROMPT);
(void) fflush(stdout);
/* read and print same no. of bytes from echo server */
expect = len;
for (received = 0; received < expect;) {
len = recv(conn, buff, (expect - received) < BUFFSIZE ?
(expect - received) : BUFFSIZE, 0);
if (len < 0) {
send_eof(conn);
return 1;
}
(void) write(STDOUT_FILENO, buff, len);
received += len;
}
(void) printf("\n");
(void) printf(INPUT_PROMPT);
(void) fflush(stdout);
}
/* iteration ends when EOF found on stdin */
(void) send_eof(conn);
(void) printf("\n");
return 0;
}
int main(int argc, char *argv[])
{
// valid input?
if(argc <= 2){
printf("usage: echoclient <computername> <appnum>\n");
return 0;
}
// this is the host - ip for example. looks strange, is aber so.
computer serverComputer;
// application number - this directly translates to port.
appnum applicationIdentifier;
// probably something from netinet in a new struct?
connection serverConnection;
// get server name
serverComputer = cname_to_comp(argv[1]);
if(serverComputer == -1){
printf("Bad host entered, try 127.0.0.1\n");
return 0;
}
// get application id
applicationIdentifier = atoi(argv[2]);
//try to contact the server
serverConnection = make_contact(
serverComputer,
applicationIdentifier);
// check connection validity
if(serverConnection == -1){
printf("could not connect\n");
return 0;
}
else
printf("connection established, id: %i\n", serverConnection);
// used for input from stdin
char userBuffer[1024];
size_t userMsgLength;
// used for input from network
char serverBuffer[1024];
int serverMsgLength;
while(1){
// check stdin for new input
if((userMsgLength = read(0, userBuffer, 1024)) > 0){
// write to connection
write(serverConnection, userBuffer, userMsgLength);
}
// check network for new output
if((serverMsgLength = read(serverConnection, serverBuffer, sizeof(serverBuffer) - 1)) > 0){
printf("Echo from server:\n");
// welcome to c - end string
serverBuffer[serverMsgLength] = 0;
// write server input to stdout
fputs(serverBuffer, stdout);
}
}
// write(serverConnection, "test", 4);
return 0;
}
