/*
 *	$Source$
 *	$Header$
 */
/*  (c) Copyright 1988 by the Massachusetts Institute of Technology. */
/*  For copying and distribution information, please see the file */
/*  <mit-copyright.h>. */

#ifndef lint
static char *rcsid_send_file_c = "$Header$";
#endif	lint

#include <mit-copyright.h>
#include <stdio.h>
#include <com_err.h>
#include <gdb.h>
#include <dcm.h>
#include <moira.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <des.h>
#include <krb.h>
#include <update.h>


extern CONNECTION conn;
extern int errno;
char buf[BUFSIZ];
extern C_Block session;

/*
 * syntax:
 * (already sent) pathname file_size checksum
 * <<< (int)code			can we send it?
 * >>> data
 * <<< 0
 * >>> data
 * <<< 0
 * ....
 * >>> data				(last block)
 * <<< 0	(on final write, close, sync, checksum)
 *
 * returns:
 *  0 on success
 *  1 on error (file not found, etc)
 */

int
send_file(pathname, target_path, encrypt)
char *pathname;
char *target_path;
int  encrypt;
{
    int n, fd, code, n_to_send, i;
    STRING data;
    unsigned char dst[UPDATE_BUFSIZ + 8], *src;
    struct stat statb;
    des_key_schedule sched;
    des_cblock ivec;

    /* send file over */
    fd = open(pathname, O_RDONLY, 0);
    if (fd < 0) {
	com_err(whoami, errno, "unable to open %s for read", pathname);
	return(MR_OCONFIG);
    }
    if (fstat(fd, &statb)) {
	com_err(whoami, errno, "unable to stat %s", pathname);
	close(fd);
	return(MR_OCONFIG);
    }
    n_to_send = statb.st_size;
    
    string_alloc(&data, UPDATE_BUFSIZ);
    sprintf(STRING_DATA(data), "XFER_00%c %d %d %s",
	    (encrypt ? '3' : '2'), n_to_send,
	    checksum_file(pathname), target_path);
    code = send_object(conn, (char *)&data, STRING_T);
    if (code) {
	com_err(whoami, code, " sending XFER request");
	close(fd);
	return(code);
    }
    code = receive_object(conn, (char *)&n, INTEGER_T);
    if (code) {
	com_err(whoami, code, " getting reply from XFER request");
	close(fd);
	return(code);
    }
    if (n) {
	com_err(whoami, n, " transfer request (XFER) rejected");
	close(fd);
	return(n);
    }
    
    code = receive_object(conn, (char *)&n, INTEGER_T);
    if (code) {
	com_err(whoami, connection_errno(conn), ": lost connection");
	close(fd);
	return(code);
    }
    if (n) {
	com_err(whoami, n, " from remote server: can't update %s",
		pathname);
	close(fd);
	return(n);
    }

    if (encrypt) {
#ifdef DEBUG
	printf("Session key %02x %02x %02x %02x  %02x %02x %02x %02x\n",
	       session[0], session[1], session[2], session[3], 
	       session[4], session[5], session[6], session[7]);
#endif /* DEBUG */
	des_key_sched(session, sched);
	bcopy(session, ivec, sizeof(ivec));
    }

    while (n_to_send > 0) {
#ifdef	DEBUG
	printf("n_to_send = %d\n", n_to_send);
#endif	/* DEBUG */
	n = read(fd, STRING_DATA(data), UPDATE_BUFSIZ);
	if (n < 0) {
	    com_err(whoami, errno, " reading %s for transmission", pathname);
	    close(fd);
	    return(MR_ABORTED);
	}
	MAX_STRING_SIZE(data) = n;
	if (encrypt) {
	    src = (unsigned char *)STRING_DATA(data);
	    bcopy(src, dst, n);
	    bzero(dst + n, 7);
	    /* encrypt! */
	    des_pcbc_encrypt(dst, src, n, sched, ivec, 0);
	    /* save vector to continue chaining */
	    for (i = 0; i < 8; i++)
	      ivec[i] = dst[n - 8 + i] ^ src[n - 8 + i];
	    /* round up to multiple of 8 */
	    data.length = (data.length + 7) & 0xfffffff8;
	}
	code = send_object(conn, (char *)&data, STRING_T);
	if (code) {
	    com_err(whoami, connection_errno(conn), " transmitting file %s",
		    pathname);
	    close(fd);
	    return(code);
	}
	n_to_send -= n;
	code = receive_object(conn, (char *)&n, INTEGER_T);
	if (code) {
	    com_err(whoami, connection_errno(conn),
		    " awaiting ACK remote server during transmission of %s",
		    pathname);
	    close(fd);
	    return(code);
	}
	if (n) {
	    com_err(whoami, n, " from remote server during transmission of %s",
		    pathname);
	    close(fd);
	    return(n);
	}
    }
    if (statb.st_size == 0) {
	code = receive_object(conn, (char *)&n, INTEGER_T);
	if (code) {
	    com_err(whoami, connection_errno(conn),
		    " awaiting ACK remote server after transmission of %s",
		    pathname);
	    close(fd);
	    return(code);
	}
	if (n) {
	    com_err(whoami, n, " from remote server after transmission of %s",
		    pathname);
	    close(fd);
	    return(n);
	}
    }
    close(fd);
    return(MR_SUCCESS);
}