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Home ► Lab Exercise ► Network Lab Exercise Programs► Reading IP and port ID from command line and sending message to server▼
Reading IP and port ID from command line and sending message to server: |
| Algorithm Steps:
Step 1: start
Step 2: Read the any IP address and port ID and message on the command line
Step3: Create a socket with address family AE_INET type SOCK_STREAM and default protocol.
Step 4: Initialize the socket and set its attribute set required port no.
Step 5: Connect to server using connect () function to initiate the request.
Step 6: If command line argument count equal to 4 then send the message to server.
Step 7: Receive the string from the server and print it at the console.
Step 8: stop.
C Program To Read IP and port ID from command line and send message to server
#include
#include
#include
#include
#include
#include
#include
#include
#define MAXBUF 1024
int main(int Count, char *Strings[])
{ int sockfd, bytes_read;
struct sockaddr_in dest;
char buffer[MAXBUF];
/*---Make sure we have the right number of parameters---*/
if ( Count < 3 || Count > 4 )
{
fprintf(stderr, "usage: %s []\n", Strings[0]);
exit(0);
}
/*---Create socket for streaming---*/
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("Socket");
exit(errno);
}
/*---Initialize server address/port struct---*/
bzero(&dest, sizeof(dest));
dest.sin_family = AF_INET;
if ( inet_addr(Strings[1], &dest.sin_addr.s_addr) == 0 )
{
perror(Strings[1]);
exit(errno);
}
dest.sin_port = htons(atoi(Strings[2]));
/*---Connect to server---*/
if ( connect(sockfd, (struct sockaddr *)&dest, sizeof(dest)) != 0 )
{
perror("Connect");
exit(errno);
}
/*---If there is a message to send server, send it with a '\n' (newline)---*/
if ( Count == 4 )
{
sprintf(buffer, "%s\n", Strings[3]);
send(sockfd, buffer, strlen(buffer), 0);
}
/*---While there's data, read and print it---*/
do
{
bzero(buffer, MAXBUF);
bytes_read = recv(sockfd, buffer, MAXBUF, 0);
if ( bytes_read > 0 )
printf("%s", buffer);
}
while ( bytes_read > 0 );
/*---Clean up---*/
close(sockfd);
return 0;
}
SAMPLE INPUT OUTPUT:
$ gcc test-port-client.c -o test.exe
$ test.exe 127.0.0.1 25
connected
$ gcc test-port-client.c -o test.exe
$ test.exe 127.0.0.1 25 HAI
connected
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