/*****************************************************************************
 *
 * $Id$
 * Purpose ...............: Execute subprogram
 *
 *****************************************************************************
 * Copyright (C) 1997-2004
 *   
 * Michiel Broek		FIDO:	2:280/2802
 * Beekmansbos 10
 * 1971 BV IJmuiden
 * the Netherlands
 *
 * This file is part of MBSE BBS.
 *
 * This BBS is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * MBSE BBS is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MBSE BBS; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "../config.h"
#include "libs.h"
#include "structs.h"
#include "clcomm.h"
#include "mberrors.h"
#include "common.h"


int	e_pid = 0;		/* Execute child pid	*/



int execute(char *cmd, char *file, char *pkt, char *in, char *out, char *err)
{
    char    buf[PATH_MAX];
    char    *vector[16];
    int	    i, pid, status = 0, rc = 0;

    if (pkt == NULL)
	sprintf(buf, "%s %s", cmd, file);
    else
	sprintf(buf, "%s %s %s", cmd, file, pkt);
    Syslog('+', "Execute: %s",buf);

#ifdef __linux__
    /*
     * Linux has async diskwrites by default.
     */
    sync();
#endif
    
    memset(vector, 0, sizeof(vector));
    i = 0;
    vector[i++] = strtok(buf," \t\n");
    while ((vector[i++] = strtok(NULL," \t\n")) && (i<16));
    vector[15] = NULL;
    fflush(stdout);
    fflush(stderr);

    if ((pid = fork()) == 0) {
	if (in) {
	    close(0);
	    if (open(in,O_RDONLY) != 0) {
		WriteError("$Reopen of stdin to %s failed", MBSE_SS(in));
		exit(MBERR_EXEC_FAILED);
	    }
	}
	if (out) {
	    close(1);
	    if (open(out,O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
		WriteError("$Reopen of stdout to %s failed", MBSE_SS(out));
		exit(MBERR_EXEC_FAILED);
	    }
	}
	if (err) {
	    close(2);
	    if (open(err,O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
		WriteError("$Reopen of stderr to %s failed", MBSE_SS(err));
		exit(MBERR_EXEC_FAILED);
	    }
	}
	errno = 0;
	rc = getpriority(PRIO_PROCESS, 0);
	if (errno == 0) {
	    rc = setpriority(PRIO_PROCESS, 0, 15);
	    if (rc)
		WriteError("$execv can't set priority to 15");
	}
	rc = execv(vector[0],vector);
	WriteError("$execv \"%s\" returned %d", MBSE_SS(vector[0]), rc);
	setpriority(PRIO_PROCESS, 0, 0);
	exit(MBERR_EXEC_FAILED);
    }

    e_pid = pid;

    do {
	rc = wait(&status);
	e_pid = 0;
    } while (((rc > 0) && (rc != pid)) || ((rc == -1) && (errno == EINTR)));

    setpriority(PRIO_PROCESS, 0, 0);

#ifdef __linux__
    sync();
#endif
    
    switch (rc) {
	case -1:
		WriteError("$Wait returned %d, status %d,%d", rc,status>>8,status&0xff);
		return MBERR_EXEC_FAILED;
	case 0:
		return 0;
	default:
		if (WIFEXITED(status)) {
		    rc = WEXITSTATUS(status);
		    if (rc) {
			WriteError("Execute: returned error %d", rc);
			return (rc + MBERR_EXTERNAL);
		    }
		}
		if (WIFSIGNALED(status)) {
		    rc = WTERMSIG(status);
		    WriteError("Wait stopped on signal %d", rc);
		    return rc;
		}
		if (rc)
		    WriteError("Wait stopped unknown, rc=%d", rc);
		return rc;	
    }
    return 0;
}


#define SHELL "/bin/sh"


int execsh(char *cmd, char *in, char *out, char *err)
{
    int	pid, status, rc, sverr;

    Syslog('+', "Execute shell: %s", MBSE_SS(cmd));
    fflush(stdout);
    fflush(stderr);

#ifdef __linux__
    sync();
#endif

    if ((pid = fork()) == 0) {
	if (in) {
	    close(0);
	    if (open(in, O_RDONLY) != 0) {
		WriteError("$Reopen of stdin to %s failed",MBSE_SS(in));
		exit(MBERR_EXEC_FAILED);
	    }
	}
	if (out) {
	    close(1);
	    if (open(out, O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
		WriteError("$Reopen of stdout to %s failed",MBSE_SS(out));
		exit(MBERR_EXEC_FAILED);
	    }
	}
	if (err) {
	    close(2);
	    if (open(err, O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
		WriteError("$Reopen of stderr to %s failed",MBSE_SS(err));
		exit(MBERR_EXEC_FAILED);
	    }
	}

	rc = execl(SHELL, "sh", "-c", cmd, NULL);
	WriteError("$execl \"%s\" returned %d", MBSE_SS(cmd), rc);
	exit(MBERR_EXEC_FAILED);
    }

    e_pid = pid;

    do {
	rc = wait(&status);
	e_pid = 0;
	sverr = errno;
	if (status)
	    WriteError("$Wait returned %d, status %d,%d", rc, status >> 8, status & 0xff);
    }

    while (((rc > 0) && (rc != pid)) || ((rc == -1) && (sverr == EINTR))); 
    if (rc == -1) {
	WriteError("$Wait returned %d, status %d,%d", rc, status >> 8, status & 0xff);
	return MBERR_EXEC_FAILED;
    }

#ifdef __linux__
    sync();
#endif

    return status;
}