NP Lab Programs:
This contains programs of 4,5,7,8 weeks
Note: 4th and 5th week programs are same.
Write two questions of 4th and 5th and start writing the same program.
Week - 4 -iterative
Concurrent Server-client Reverse
Name: tcpClientReverse.c and tcpServerReverse.c
Week - 5 -Interactive
Concurrent Server-client Reverse
Name: tcpClientReverse.c and tcpServerReverse.c
Week - 7
Concurrent Server-Client Upper Case
Name:
tcpClientUpper.c & tcpServerUpper.c
Week - 8
Concurrent Server-Client Using Poll
Name: tcpClientPoll.c and tcpServerPoll.c
This contains programs of 4,5,7,8 weeks
Note: 4th and 5th week programs are same.
Write two questions of 4th and 5th and start writing the same program.
Week - 4 -iterative
Concurrent Server-client Reverse
Name: tcpClientReverse.c and tcpServerReverse.c
Week - 5 -Interactive
Concurrent Server-client Reverse
Name: tcpClientReverse.c and tcpServerReverse.c
Week - 7
Concurrent Server-Client Upper Case
Name:
tcpClientUpper.c & tcpServerUpper.c
Week - 8
Concurrent Server-Client Using Poll
Name: tcpClientPoll.c and tcpServerPoll.c
/***************************************************************************
TcpClientReverse
* FILENAME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#include < stdio.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#define MAXBUFFER 1024
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
*
FUNCTION NAME:sendstring
*
DESCRIPTION: sends a string over the socket .
*
NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{
int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
TcpClientReverseUsingSelect
* FILENAME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#include < stdio.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#define MAXBUFFER 1024
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
*
FUNCTION NAME:sendstring
*
DESCRIPTION: sends a string over the socket .
*
NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{
int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
TcpServerReverse
#include < stdio.h >
#include < stdlib.h>
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < sys/wait.h >
#include < fcntl.h >
#include < unistd.h >
#include < stdlib.h>
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < sys/wait.h >
#include < fcntl.h >
#include < unistd.h >
#define MYPORT 13154 /*The port users will be connecting to*/
void readstring(int,char *);
int main(int C, char *V[] )
{
int listensocket,connectionsocket,retbind;
struct sockaddr_in
serveraddress,cliaddr;
socklen_t len;
char buf[100],databuf[1024];
listensocket = socket(AF_INET, SOCK_STREAM, 0 );
if (listensocket < 0 )
{
perror("socket" );
exit(1);
}
memset(&serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(MYPORT);/*PORT NO*/
serveraddress.sin_addr.s_addr = htonl(INADDR_ANY);/*ADDRESS*/
retbind=bind(listensocket,(struct sockaddr*)&serveraddress,
sizeof(serveraddress));
/*Check the return value of bind for error*/
if(-1==retbind)
{
perror("BIND ERROR\n");
exit(1);
}
listen(listensocket,5);
/*Beginning of the Main Server Processing Loop*/
for (;;)
{
printf("Server:I am waiting-----Start of Main Loop\n");
len=sizeof(cliaddr);
connectionsocket=accept(listensocket,
(struct sockaddr*)&cliaddr,&len);
if (connectionsocket < 0)
{
if (errno == EINTR)
printf("Interrupted system call ??");
continue;
}
printf("Connection from %s\n",
inet_ntop(AF_INET,&cliaddr.sin_addr,buf,sizeof(buf)));
readstring(connectionsocket , databuf);
close(connectionsocket);
printf("Finished Serving One Client\n");
}
}
/********************************************************************
* FUNCTION NAME:readstring
* DESCRIPTION: Reads the string sent by the client over the
* socket and stores it in the array fname .
* NOTES : No Error Checking is done .
* RETURNS :void
*********************************************************************/
void readstring(
int connectionsocket, /*Socket Descriptor*/
char *fname) /*Array , to be populated by the string from client*/
/********************************************************************/
{
int pointer=0,n;
int len=0,a,b;
char rev[50],temp[50],temp1[50];
int k,i;
while ((n=read(connectionsocket,(fname + pointer),1024))>0)
{
pointer=pointer+n;
}
fname[pointer]='\0';
printf("enter the string\n");
printf("Server :Received %s\n " ,fname);
//strcpy(temp,fname);
k=strlen(fname);
// for(k=0;temp[k]!=0;k++);
// len=k;
a=0;
for(i=k-1;i>=0;i--)
temp[a++]=fname[i];
temp[a]='\0';
printf("\nrev is %s\n", temp);
}
/**********************************************************************/
#include < stdio.h >
#include < stdlib.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < sys/wait.h >
#include < fcntl.h >
#include < unistd.h >
#include < stdlib.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < sys/wait.h >
#include < fcntl.h >
#include < unistd.h >
#define MYPORT 13154 /*The port users will be connecting to*/
void readstring(int,char *);
int main(int C, char *V[] )
{
int listensocket,connectionsocket,retbind;
struct sockaddr_in
serveraddress,cliaddr;
socklen_t len;
char buf[100],databuf[1024];
listensocket = socket(AF_INET, SOCK_STREAM, 0 );
if (listensocket < 0 )
{
perror("socket" );
exit(1);
}
memset(&serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(MYPORT);/*PORT NO*/
serveraddress.sin_addr.s_addr = htonl(INADDR_ANY);/*ADDRESS*/
retbind=bind(listensocket,(struct sockaddr*)&serveraddress,
sizeof(serveraddress));
/*Check the return value of bind for error*/
if(-1==retbind)
{
perror("BIND ERROR\n");
exit(1);
}
listen(listensocket,5);
/*Beginning of the Main Server Processing Loop*/
for (;;)
{
printf("Server:I am waiting-----Start of Main Loop\n");
len=sizeof(cliaddr);
connectionsocket=accept(listensocket,
(struct sockaddr*)&cliaddr,&len);
if (connectionsocket < 0)
{
if (errno == EINTR)
printf("Interrupted system call ??");
continue;
}
printf("Connection from %s\n",
inet_ntop(AF_INET,&cliaddr.sin_addr,buf,sizeof(buf)));
readstring(connectionsocket , databuf);
close(connectionsocket);
printf("Finished Serving One Client\n");
}
}
/********************************************************************
* FUNCTION NAME:readstring
* DESCRIPTION: Reads the string sent by the client over the
* socket and stores it in the array fname .
* NOTES : No Error Checking is done .
* RETURNS :void
*********************************************************************/
void readstring(
int connectionsocket, /*Socket Descriptor*/
char *fname) /*Array , to be populated by the string from client*/
/********************************************************************/
{
int pointer=0,n;
int len=0,a,b;
char rev[50],temp[50],temp1[50];
int k,i;
while ((n=read(connectionsocket,(fname + pointer),1024))>0)
{
pointer=pointer+n;
}
fname[pointer]='\0';
printf("enter the string\n");
printf("Server :Received %s\n " ,fname);
//strcpy(temp,fname);
k=strlen(fname);
// for(k=0;temp[k]!=0;k++);
// len=k;
a=0;
for(i=k-1;i>=0;i--)
temp[a++]=fname[i];
temp[a]='\0';
printf("\nrev is %s\n", temp);
}
/**********************************************************************/
tcpClientUpper
/*
*ME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#define MAXBUFFER 1024
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
* FUNCTION NAME:sendstring
* DESCRIPTION: sends a string over the socket .
* NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{ int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
*ME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#include < stdio.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
* FUNCTION NAME:sendstring
* DESCRIPTION: sends a string over the socket .
* NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{ int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
tcpServerUpper
#include < stdlib.h >
#include < stdio.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/select.h >
#include < sys/time.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < stdio.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/select.h >
#include < sys/time.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#define MAXLINE 100
#define SERV_PORT 13153
int main(int argc, char **argv)
{
int k, i, maxi, maxfd, listenfd, connfd, sockfd;
int nready, client[FD_SETSIZE];
ssize_t n;
fd_set rset, allset;
char line[MAXLINE],buf[100];
socklen_t clilen;
struct sockaddr_in cliaddr, servaddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd < 0 )
{
perror("socket" );
exit(1);
}
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
listen(listenfd,5);
maxfd = listenfd; /* initialize */
maxi = -1; /* index into client[] array */
for (i = 0; i < FD_SETSIZE; i++)
client[i] = -1; /* -1 indicates available entry */
FD_ZERO(&allset);
FD_SET(listenfd, &allset);
/* end fig01 */
/* include fig02 */
for ( ; ; ) {
printf("Server:I am waiting-----Start of Main Loop\n");
rset = allset; /* structure assignment */
nready = select(maxfd+1, &rset, NULL, NULL, NULL);
if (FD_ISSET(listenfd, &rset)) { /* new client connection */
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr *) &cliaddr, &clilen);
#ifdef NOTDEF
printf("new client: %s, port %d\n",
inet_ntop(AF_INET, &cliaddr.sin_addr, buf, NULL),
ntohs(cliaddr.sin_port));
#endif
for (i = 0; i < FD_SETSIZE; i++)
if (client[i] < 0) {
client[i] = connfd; /* save descriptor */
break;
}
if (i == FD_SETSIZE)
{
printf("too many clients");
exit(0);
}
FD_SET(connfd, &allset); /* add new descriptor to set */
if (connfd > maxfd)
maxfd = connfd; /* for select */
if (i > maxi)
maxi = i; /* max index in client[] array */
if (--nready <= 0)
continue; /* no more readable descriptors
*/
}
for (i = 0; i <= maxi; i++) { /* check all clients for data */
if ( (sockfd = client[i]) < 0)
continue;
if (FD_ISSET(sockfd, &rset)) {
if ( (n = read(sockfd, line, MAXLINE)) == 0) {
/*4connection closed by client */
close(sockfd);
FD_CLR(sockfd, &allset);
client[i] = -1;
} else
{
printf("\n output at server\n");
for(k=0;line[k]!='\0';k++)
printf("%c",toupper(line[k]));
write(sockfd, line, n);
}
if (--nready <= 0)
break; /* no more readable descriptors
*/
}
}
}
}
/* end fig02 */
-----------------------------------------------------------------
tcpClientPoll
/***************************************************************************
* FILENAME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#define MAXBUFFER 1024
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
*
FUNCTION NAME:sendstring
*
DESCRIPTION: sends a string over the socket .
*
NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{
int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
* FILENAME : democlient.c
* DESCRIPTION:Contains Code for a client that will send a string
* to a server process and exits.
* Invoke the Executable as a.out IPAddress PortNo string
* Copyright 2007 Aricent
*****************************************************************************/
#include < stdio.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < stdlib.h >
#include < unistd.h >
#include < errno.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
void sendstring(int , char *);
int main( int C, char *V[] )
{
int sd,fd;
char c;
struct sockaddr_in serveraddress;
char text[100];
int i=0;
sd = socket( AF_INET, SOCK_STREAM, 0 );
if( sd <0 ) {
perror( "socket" );
exit( 1 );
}
if (V[1] == NULL ) {
printf ("PL specfiy the server's IP Address \n");
exit(0);
}
if (V[2] == NULL ) {
printf ("PL specify the server's Port No \n");
exit(0);
}
// if (V[3] == NULL ) {
// printf ("PL specfiy the string to be send to the server \n");
// exit(0);
// }
memset( &serveraddress, 0, sizeof(serveraddress) );
serveraddress.sin_family = AF_INET;
serveraddress.sin_port = htons(atoi(V[2]));//PORT NO
serveraddress.sin_addr.s_addr = inet_addr(V[1]);//ADDRESS
if (connect(sd,(struct sockaddr*)&serveraddress,
sizeof(serveraddress))<0)
{
printf("Cannot Connect to server");
exit(1);
}
printf("enter sentence to end enter #");
while(1)
{
c=getchar();
if(c=='#')
break;
text[i++]=c;
}
text[i]='\0';
sendstring(sd,text);
close(sd);
return 0;
}
/************************************************************************
*
FUNCTION NAME:sendstring
*
DESCRIPTION: sends a string over the socket .
*
NOTES : No Error Checking is done .
* RETURNS :void
************************************************************************/
void sendstring(
int sd, /*Socket Descriptor*/
char *fname) /*Array Containing the string */
/*************************************************************************/
{
int n , byteswritten=0 , written ;
char buffer[MAXBUFFER];
strcpy(buffer , fname);
n=strlen(buffer);
while (byteswritten
{
written=write(sd , buffer+byteswritten,(n-byteswritten));
byteswritten+=written;
}
printf("String : %s sent to server \n",buffer);
}
/****************************************************************************/
tcpServerPoll
#include < stdlib.h >
#include < stdio.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < limits.h > /* for OPEN_MAX */
#include < poll.h >
#include < errno.h >
#include < stdio.h >
#include < string.h >
#include < sys/types.h >
#include < sys/stat.h >
#include < sys/socket.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < fcntl.h >
#include < limits.h > /* for OPEN_MAX */
#include < poll.h >
#include < errno.h >
#define SERV_PORT 13154
#define POLLRDNORM 5
#define INFTIM 5
#define OPEN_MAX 5
int main(int argc, char **argv)
{
int k, i, maxi, listenfd, connfd, sockfd;
int nready;
ssize_t n;
char line[MAXLINE];
socklen_t clilen;
struct pollfd client[OPEN_MAX];
struct sockaddr_in cliaddr, servaddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
listen(listenfd, 5);
client[0].fd = listenfd;
client[0].events = POLLRDNORM;
for (i = 1; i < OPEN_MAX; i++)
client[i].fd = -1; /* -1 indicates available entry */
maxi = 0; /* max index into client[] array */
/* end fig01 */
/* include fig02 */
for ( ; ; )
{
nready = poll(client, maxi+1, INFTIM);
if (client[0].revents & POLLRDNORM)
{
/* new client connection */
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr *) &cliaddr, &clilen);
#ifdef NOTDEF
printf("new client: %s\n", sock_ntop((struct sockaddr *) &cliaddr,clilen));
#endif
for (i = 1; i < OPEN_MAX; i++)
if (client[i].fd < 0)
{
client[i].fd = connfd; /* save descriptor */
break;
}
if (i == OPEN_MAX)
{
printf("too many clients");
exit(0);
}
client[i].events = POLLRDNORM;
if (i > maxi)
maxi = i; /* max index in client[] array */
if (--nready <= 0)
continue; /* no more readable descriptors */
}
for (i = 1; i <= maxi; i++)
{
/* check all clients for data */
if ( (sockfd = client[i].fd) < 0)
continue;
if (client[i].revents & (POLLRDNORM | POLLERR))
{
if ( (n = read(sockfd, line, MAXLINE)) < 0)
{
if (errno == ECONNRESET)
{
/*4connection reset by client */
#ifdef NOTDEF
printf("client[%d] aborted connection\n", i);
#endif
close(sockfd);
client[i].fd = -1;
}
else
printf("readline error");
}
else if (n== 0)
{
/*4connection closed by client */
#ifdef NOTDEF
printf("client[%d] closed connection\n", i);
#endif
close(sockfd);
client[i].fd = -1;
}
else
{
printf("\n data from client is \n");
k=strlen(line);
printf(" length=%d data = %s\n", k,line);
//write(sockfd, line, n);
strcpy(line," ");
}
if (--nready <= 0)
break; /* no more readable descriptors */
}
}
}
}
/* end fig02 */
KUMCLIENT
#include < stdio.h >
#include < stdlib.h >
#include < error.h >
#include < unistd.h >
#include < sys/socket.h >
#include < sys/types.h >
#include < netinet/in.h >
#include < string.h >
#include < arpa/inet.h >
#include < stdlib.h >
#include < error.h >
#include < unistd.h >
#include < sys/socket.h >
#include < sys/types.h >
#include < netinet/in.h >
#include < string.h >
#include < arpa/inet.h >
#define BUFFER 1024
main(int argc, char **argv)
{
struct sockaddr_in remote_server;
int sock;
char input[BUFFER];
char output[BUFFER];
int len;
if((sock = socket(AF_INET, SOCK_STREAM, 0)) == ERROR)
{
perror("socket");
exit(-1);
}
remote_server.sin_family = AF_INET;
remote_server.sin_port = htons(atoi(argv[2]));
remote_server.sin_addr.s_addr = inet_addr(argv[1]);
bzero(&remote_server.sin_zero, 8);
if((connect(sock, (struct sockaddr *) &remote_server, sizeof(struct sockaddr_in))) == ERROR)
{
perror("connect");
exit(-1);
}
while(1)
{
fgets(input, BUFFER, stdin);
send(sock, input, strlen(input), 0);
len = recv(sock, output, BUFFER,0);
output[len] = '\0';
printf("%s\n",output);
}
close(sock);
}
KUMSERVER
#include < stdio.h >
#include < stdlib.h >
#include < sys/socket.h >
#include < unistd.h >
#include < sys/types.h >
#include < strings.h >
#include < error.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#include < stdlib.h >
#include < sys/socket.h >
#include < unistd.h >
#include < sys/types.h >
#include < strings.h >
#include < error.h >
#include < netinet/in.h >
#include < arpa/inet.h >
#define MAX_CLIENTS 2
#define MAX_DATA 1024
main(int argc, char **argv)
{
struct sockaddr_in server;
struct sockaddr_in client;
int sock;
int new;
int sockaddr_len = sizeof(struct sockaddr_in);
int data_len;
char data[MAX_DATA];
if((sock = socket(AF_INET, SOCK_STREAM, 0)) == ERROR)
{
perror(" server socket:");
exit(-1);
}
server.sin_family =AF_INET;
server.sin_port =htons(atoi(argv[1]));
server.sin_addr.s_addr = INADDR_ANY;
bzero(&server.sin_zero,8);
if((bind(sock,(struct sockaddr*)&server,sockaddr_len)) == ERROR)
{
perror("bind:");
exit(-1);
}
if((listen(sock,MAX_CLIENTS)) == ERROR)
{
perror("listen:");
exit(-1);
}
while(1) //better signal handling required//
{
if ((new = accept(sock,(struct sockaddr*)&client,&sockaddr_len))==ERROR)
{
perror("accept:");
exit(-1);
}
printf("NEW client connected from port no %d and IP %s\n", ntohs(client.sin_port),inet_ntoa(client.sin_addr));
data_len = 1;
while(data_len)
{
data_len = recv(new,data,MAX_DATA,0);
if(data_len)
{
send(new, data, data_len, 0);
data[data_len] = '\0';
printf("sent mesg: %s", data);
}
}
printf("client disconnected\n");
close(new);
}
}
No comments:
Post a Comment