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/**
* @class ProtoSocketStandaloneExample
*
* @brief This file illustrates ProtoSocket stand-alone usage in a
* very simple "client" or "server" application. The
* ProtoSocket class is used in a non-async fashion.
*
* (Note the "protoExample.cpp" file contains a more complex
* example using Protolib sockets and timers asynchronously
* by deriving from the ProtoApp base class which uses
* a "ProtoDispatcher" instance in its main loop.)
*
* To build this "simple" app (after making libProtokit.a) use:
* g++ -DUNIX -DHAVE_IPV6 -o simple simpleTcpExample.cpp ../unix/libProtokit.a
*
* (it can also be similarly built with -DWIN32 instead of -DUNIX)
*/
#include "protoSocket.h"
#include <stdio.h>
inline void usage()
{
fprintf(stderr, "Usage: simple {listen <port> | connect <serverAddr> <serverPort>}\n");
}
int main(int argc, char* argv[])
{
UINT16 serverPort = 0;
ProtoAddress serverAddr;
if (3 == argc) // "simple listen <portNumber>"
{
if (!strncmp("listen", argv[1], strlen(argv[1])))
{
if (1 != (sscanf(argv[2], "%hu", &serverPort)))
{
fprintf(stderr, "simple: bad <port>\n");
serverPort = 0;
}
}
}
else if (4 == argc) // "simple connect <serverAddr> <serverPort>
{
if (!strncmp("connect", argv[1], strlen(argv[1])))
{
if (1 != (sscanf(argv[3], "%hu", &serverPort)))
{
fprintf(stderr, "simple: bad <serverPort>\n");
serverPort = 0;
}
else if (!serverAddr.ResolveFromString(argv[2]))
{
fprintf(stderr, "simple: bad <serverAddr>\n");
serverPort = 0;
}
else
{
serverAddr.SetPort(serverPort);
}
}
}
if (!serverAddr.IsValid() && (0 == serverPort))
{
usage();
return -1;
}
if (serverAddr.IsValid()) // connect to server address as a "client" and make a request
{
ProtoSocket clientSocket(ProtoSocket::TCP);
fprintf(stderr, "simple: client connecting to server: %s/%hu ...\n",
serverAddr.GetHostString(), serverAddr.GetPort());
if (!clientSocket.Connect(serverAddr))
{
fprintf(stderr, "simple: error connecting to server: %s/%hu\n",
serverAddr.GetHostString(),
serverAddr.GetPort());
return -1;
}
fprintf(stderr, "simple: client sending request to server ...\n");
const char* clientRequest = "Hello Server, this is a simple protolib client!";
unsigned int length = strlen(clientRequest) + 1;
unsigned int sent = 0;
while (sent < length)
{
unsigned int numBytes = length - sent;
if (!clientSocket.Send(clientRequest+sent, numBytes))
{
fprintf(stderr, "simple: error sending to server\n");
clientSocket.Close();
return -1;
}
else
{
sent += numBytes;
}
}
fprintf(stderr, "simple: client awaiting response from server ...\n");
bool receiving = true;
while (receiving)
{
char buffer[256];
buffer[255] = '\0';
unsigned int numBytes = 255;
if (!clientSocket.Recv(buffer, numBytes))
{
fprintf(stderr, "simple: error receiving from server\n");
clientSocket.Close();
return -1;
}
else if (numBytes > 0)
{
fprintf(stdout, "simple: client recvd \"%s\" from server: %s/%hu\n",
buffer,
serverAddr.GetHostString(),
serverAddr.GetPort());
}
else
{
fprintf(stderr, "simple: server shutdown connection.\n");
receiving = false;
}
} // end while(receiving)
clientSocket.Close();
}
else // act as a "server" listening to the indicated port, responding to requests
{
for (;;)
{
ProtoSocket serverSocket(ProtoSocket::TCP);
if (!serverSocket.Listen(serverPort))
{
fprintf(stderr, "simple: server error listening\n");
serverSocket.Close();
return -1;
}
else
{
fprintf(stderr, "simple: server listening on port:%hu ... (use <CTRL-C> to exit)\n", serverPort);
if (!serverSocket.Accept())
{
fprintf(stderr, "simple: server error accepting connection\n");
serverSocket.Close();
return -1;
}
fprintf(stderr, "simple: server accepted connection from client: %s/%hu ...\n",
serverSocket.GetDestination().GetHostString(),
serverSocket.GetDestination().GetPort());
bool receiving = true;
while (receiving)
{
char buffer[256];
buffer[255] = '\0';
unsigned int numBytes = 255;
if (!serverSocket.Recv(buffer, numBytes))
{
fprintf(stderr, "simple: error receiving from client\n");
serverSocket.Close();
return -1;
}
else if (numBytes > 0)
{
fprintf(stdout, "simple: server recvd \"%s\" from client: %s/%hu\n",
buffer,
serverSocket.GetDestination().GetHostString(),
serverSocket.GetDestination().GetPort());
if (NULL != strchr(buffer, '!'))
{
fprintf(stderr, "simple: server recvd EOT character '!' from client ...\n");
receiving = false;
}
break;
}
else
{
fprintf(stderr, "simple: client closed connection\n");
receiving = false;
}
}
fprintf(stderr, "simple: server sending response to client ...\n");
const char* serverResponse = "Hi there Client, this is a simple protolib server";
unsigned int length = strlen(serverResponse) + 1;
unsigned int sent = 0;
while (sent < length)
{
unsigned int numBytes = length - sent;
if (!serverSocket.Send(serverResponse+sent, numBytes))
{
fprintf(stderr, "simple: error sending to client\n");
serverSocket.Close();
return -1;
}
else
{
sent += numBytes;
}
}
serverSocket.Shutdown();
// After "Shutdown" on a blocking socket, ProtoSocket::Recv() will unblock upon
// receiving "FIN" from client TCP
char buffer[8];
unsigned int numBytes = 8;
serverSocket.Recv(buffer, numBytes);
if (0!= numBytes)
fprintf(stderr, "simple: server received extra data from client?\n\n");
else
fprintf(stderr, "simple: server transmission complete.\n\n");
}
serverSocket.Close();
} // end for (;;)
}
} // end main();