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  1.  Home
  2. C400-L
  3. June 2000

One more example for today !

  • Subject: One more example for today !
  • From: "Phil Hall" <hallp@xxxxxxxx>
  • Date: Tue, 13 Jun 2000 16:58:29 -0500
 
Here's a little example of using the Dynamic Screen Manager (DSM) API's. It
requests a user supplied number of ephemeral ports from OS/400 - I used it
to test a error when the OS returned negative port numbers on a old release,
but what it does, doesn't really matter it's real use now is for showing the
DSM API's

Create the program as PORTGRAB, then call it. If you call it with zero
parameters, a usage message is displayed.

Using DSM is real fun !

[Sorry if the long lines are split]

--phil

/*-------------------------------------------------
 * includes
 *------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <qsnapi.h>

/*-------------------------------------------------
 * defines
 *------------------------------------------------*/
#define TRUE   1
#define FALSE  1

/*-------------------------------------------------
 * prototypes
 *------------------------------------------------*/
void DrawBasicWindow(const Qsn_Cmd_Buf_T *cmdBuffer, const Qsn_Win_T
*window);
void DrawWindow(const Qsn_Win_T *window, const Qsn_Cmd_Buf_T *cmdBuffer);
void DisplayUsageData(Qsn_Win_T *window);

/*-------------------------------------------------
 * structures
 *------------------------------------------------*/
typedef struct storage
{
    Qsn_Ssn_Desc_T sessDesc;
    char           buffer[100];
} storage;

/*-------------------------------------------------
 * global/static
 *------------------------------------------------*/

/*-------------------------------------------------
 * main()
 *------------------------------------------------*/
int main(int argc, char **argv)
{
    Qsn_Win_Ext_Inf_T extWinInf = { NULL, NULL, NULL, NULL, NULL, NULL };
    Qsn_Win_Desc_T winDesc;
    Qsn_Win_T      theWindow;
    Q_Bin4         winDescLen = sizeof(winDesc);
    Qsn_Cmd_Buf_T  cmdBuffer;
    char           textBuffer[60] = "";
    char           aid;

    long           counter = 0;
    long           tries = 1;

    /*-- set up session window --*/
    QsnInzWinD(&winDesc, winDescLen, NULL);
    winDesc.GUI_support = '0';
    winDesc.top_row = 3;
    winDesc.left_col = 10;
    winDesc.num_rows = 12;
    winDesc.num_cols = 60;
    extWinInf.draw_fp = DrawWindow;

    theWindow = QsnCrtWin( &winDesc,
         winDescLen,
         &extWinInf,
         sizeof(extWinInf),
         '1',
         NULL, 0, NULL, NULL);

    /*-- sanity check for parameters --*/
    switch ( argc )
    {
        case 2:
        {
            tries = atoi( argv[1] );
            if ( tries < 1 )
            {
                DisplayUsageData(&theWindow);
                exit( 99 );
            }
            break;
        }

        default:
        {
            DisplayUsageData(&theWindow);
            exit( 99 );
        }
    }

    cmdBuffer = QsnCrtCmdBuf(100, 20, 0, NULL, NULL);
    sprintf(textBuffer, "TCP/IP Port Grabber started...");
    QsnWrtDta(textBuffer, strlen(textBuffer), 0, 3, 1, QSN_SA_HI,
QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
    sprintf(textBuffer, "Settings: iterations = %ld", tries);
    QsnWrtDta(textBuffer, strlen(textBuffer), 0, 5, 3, QSN_SA_HI,
QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
    QsnPutBuf(cmdBuffer, 0, 0);

    for ( counter = 0; counter < tries; counter++)
    {
        unsigned short thePort = 0;
        int            theSock = 0;
        int            struct_size = 0;
        struct         sockaddr_in addr, serv_addr;

        if ( (theSock = socket(AF_INET, SOCK_STREAM, 0)) <0 )
        {
            sprintf(textBuffer, "Unable to create socket");
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 7, 3, QSN_SA_HI,
QSN_SA_NORM,
                      QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
            sprintf(textBuffer, "TCP/IP Port Grabber ended.");
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 9, 1, QSN_SA_HI,
QSN_SA_NORM,
                       QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow,
NULL);
            QsnPutBuf(cmdBuffer, 0, 0);
            aid = QsnGetAID(NULL, 0, NULL);
            return -1;
        }

        memset(&serv_addr, 0, sizeof(serv_addr) );
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
        serv_addr.sin_port = htons(thePort);

        if ( bind( theSock, (struct sockaddr *)&serv_addr,
sizeof(serv_addr)) < 0)
        {
            struct_size = sizeof(serv_addr);
            getsockname(theSock, (struct sockaddr *) &serv_addr,
&struct_size);
            thePort = ntohs(serv_addr.sin_port);
            close(theSock);
            sprintf(textBuffer, "Unable to bind to socket number %d, on port
%d", theSock, thePort);
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 7, 3, QSN_SA_HI,
QSN_SA_NORM,
                      QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
            sprintf(textBuffer, "TCP/IP Port Grabber ended.");
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 9, 1, QSN_SA_HI,
QSN_SA_NORM,
                       QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow,
NULL);
            QsnPutBuf(cmdBuffer, 0, 0);
            aid = QsnGetAID(NULL, 0, NULL);
            return -1;
        }

        struct_size = sizeof(serv_addr);
        getsockname(theSock, (struct sockaddr *) &serv_addr, &struct_size);
        thePort = ntohs(serv_addr.sin_port);

        if ( thePort < 0 )
        {
            close(theSock);
            sprintf(textBuffer, "Negative port returned by OS/400, after %ld
iterations", counter);
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 7, 3, QSN_SA_HI,
QSN_SA_NORM,
                      QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
            sprintf(textBuffer, "TCP/IP Port Grabber ended.");
            QsnWrtDta(textBuffer, strlen(textBuffer), 0, 9, 1, QSN_SA_HI,
QSN_SA_NORM,
                       QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow,
NULL);
            QsnPutBuf(cmdBuffer, 0, 0);
            aid = QsnGetAID(NULL, 0, NULL);
            return -1;
        }

        /*-- finished with the socket --*/
        close( theSock );
    }

    /*-- finished our test --*/
    sprintf(textBuffer, "OS/400 successfully returned %ld port numbers.",
counter);
    QsnWrtDta(textBuffer, strlen(textBuffer), 0, 7, 3, QSN_SA_HI,
QSN_SA_NORM,
              QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
    sprintf(textBuffer, "TCP/IP Port Grabber ended.");
    QsnWrtDta(textBuffer, strlen(textBuffer), 0, 9, 1, QSN_SA_HI,
QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, theWindow, NULL);
    QsnPutBuf(cmdBuffer, 0, 0);
    aid = QsnGetAID(NULL, 0, NULL);
    return 0;
}

void DrawBasicWindow(const Qsn_Cmd_Buf_T *cmdBuffer, const Qsn_Win_T
*window)
{
    char           *f_keys = "F3=Exit";
    char           *title  = "TCP/IP Port Grabber";

    QsnWrtDta( title, strlen(title), 0, 1, 20, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_WHT, QSN_SA_NORM, *cmdBuffer, *window, NULL);
    QsnWrtDta( f_keys, strlen(f_keys), 0, -1, 1, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_BLU, QSN_SA_NORM, *cmdBuffer, *window, NULL);
    return;
}

void DrawWindow(const Qsn_Win_T *window, const Qsn_Cmd_Buf_T *cmdBuffer)
{
    DrawBasicWindow(cmdBuffer, window);
    return;
}

void DisplayUsageData(Qsn_Win_T *window)
{
    char aid;
    Qsn_Cmd_Buf_T cmdBuffer;
    char *m1 = "Usage PORTGRAB 'iterations'";
    char *m2 = "Where:";
    char *m3 = "  'iterations' is the number of times to request";
    char *m4 = "               OS/400 to generate a port number.";
    char *m5 = "Example: PORTGRAB '500'";

    cmdBuffer = QsnCrtCmdBuf(100, 20, 0, NULL, NULL);
    QsnWrtDta( m1, strlen(m1), 0, 3, 2, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, *window, NULL);
    QsnWrtDta( m2, strlen(m2), 0, 5, 2, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, *window, NULL);
    QsnWrtDta( m3, strlen(m3), 0, 6, 2, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, *window, NULL);
    QsnWrtDta( m4, strlen(m4), 0, 7, 2, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, *window, NULL);
    QsnWrtDta( m5, strlen(m5), 0, 9, 2, QSN_SA_HI, QSN_SA_NORM,
               QSN_SA_NORM, QSN_SA_NORM, cmdBuffer, *window, NULL);

    QsnPutBuf(cmdBuffer, 0, 0);
    aid = QsnGetAID(NULL, 0, NULL);
    return;
}


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