/*
 * Don't forget to update my definitions of BASE, OWNER_UID, OWNER_GID
 * and the PATH to "CVS" in the execl() system call to match the 
 * definitions you're using.
 */

/*
 *          TITLE: run-cvs.c
 *
 *          Author: Joseph L. Kizzier
 *
 *          Date: April 04, 2001
 *
 * ---------------------------------------------------------------------
 *
 *  This program automates the "chroot" of the network CVS server.
 *
 *  The executable is placed in
 *
 *      /usr/local/sbin
 *
 *  and is called from
 *
 *      /etc/inetd.conf
 *
 *  with the following entry:
 *
 *      cvspserver stream tcp nowait root /usr/local/sbin/run-cvs  cvs
 *
 * ---------------------------------------------------------------------
 *
 * Global Constants: MIN, ERROR, ARGLIM, BASE, OWNER_UID, OWNER_GID
 *
 *     Dependencies: never
 *
 *    Global Macros: none
 *
 *  Global Typedefs: none
 *
 * ---------------------------------------------------------------------
 *
 */

/* $Id: run-cvs.c,v 1.3 2001/04/05 16:06:25 markd Exp $ */

#ifndef __runcvsc__
#define __runcvsc__

#include  <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include  <errno.h>

/* Literal constants                                                 */
#define   MIN   0
#define ERROR  -1
#define ARGLIM  1

/* You'll need to modify these constants to match your configuration */
#define BASE "/home/cvsowner/cvs-server-root/"  /* your CVS server root */
#define OWNER_UID 6000                       /* your cvsowner UID    */
#define OWNER_GID 350                        /* your CVS GID         */

/* Function prototypes                                               */
extern int chroot_filesys(int, int, char *, char *);
extern int                            usage(char *);

#endif


int chroot_filesys(res, ret, buffer, progname)
    int            res;
    int                 ret;
    char *                   buffer;
    char *                           progname;
{
    res = chdir(BASE);
    if (res == ERROR) {
        sprintf(buffer, "%s: (chdir) %s\n", progname, strerror(errno));
        return(ERROR);
    }

    res = chroot(BASE);
    if (res == ERROR) {
        sprintf(buffer, "%s: (chroot) %s\n", progname, strerror(errno));
        return(ERROR);
    }

    res = setgid(OWNER_GID);
    if (res == ERROR) {
        sprintf(buffer, "%s: (setgid) %s\n", progname, strerror(errno));
        return(ERROR);
    }

    res = setuid(OWNER_UID);
    if (res == ERROR) {
        sprintf(buffer, "%s: (setuid) %s\n", progname, strerror(errno));
        return(ERROR);
    }

    /* If you have "cvs" in a different location, make the change here. */
    /* NOTE: this PATH is relative to $CVSROOT!                         */
    ret = execl("/usr/local/bin/cvs", "cvs",
          "--allow-root=/cvsweb", "pserver", NULL);

    if (ret == ERROR) {
        sprintf(buffer, "%s: (execl) %s\n", progname, strerror(errno));
        return(ERROR);
    }
    return(MIN);
}


int  usage(progname)
    char * progname;
{
    fprintf(stderr, "Usage: %s\n", progname);
    return(ERROR);
}


int main(argc, argv)
    int  argc;
    char **    argv;
{
    int                 res;
    int                 ret;
    int                   i;

    char *           buffer;
    char * progname = *argv;

    if (argc > ARGLIM) {
        usage(progname);
        return(ERROR);
    }

    if ((i = chroot_filesys(res, ret, buffer, progname)) == ERROR) {
        fprintf(stderr, "%s\n", buffer);
        return(ERROR);
    }
    return(MIN);
}