Il CD di internet/CD.iso/SOURCE/N/TCPIP/NETKIT-B.05/NETKIT-B/NetKit-B-0.05/rwall/rwall.c

C/C++ Source or Header | 1993-12-17 | 5.1 KB | 178 lines

/*
 * Copyright (c) 1993 Christopher G. Demetriou
 * Copyright (c) 1988, 1990 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*static char sccsid[] = "from: @(#)wall.c    5.14 (Berkeley) 3/2/91";*/
static char rcsid[] = "$Id: rwall.c,v 1.5 1993/12/10 19:24:39 jtc Exp $";
#endif /* not lint */

/*
 * This program is not related to David Wall, whose Stanford Ph.D. thesis
 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include <paths.h>

#include <rpc/rpc.h>
#include <rpcsvc/rwall.h>

struct timeval timeout = { 25, 0 };
int mbufsize;
char *mbuf;

void makemsg ();

int
main(argc, argv)
    int argc;
    char **argv;
{
    char *wallhost, res;
    CLIENT *cl;

    if ((argc < 2) || (argc > 3)) {
        fprintf(stderr, "usage: %s hostname [file]\n", argv[0]);
        exit(1);
    }

    wallhost = argv[1];

    makemsg(argv[2]);

    /*
     * Create client "handle" used for calling MESSAGEPROG on the
     * server designated on the command line. We tell the rpc package
     * to use the "tcp" protocol when contacting the server.
    */
    cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
    if (cl == NULL) {
        /*
         * Couldn't establish connection with server.
         * Print error message and die.
         */
        clnt_pcreateerror(wallhost);
        exit(1);
    }

    if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) {
        /*
         * An error occurred while calling the server.
         * Print error message and die.
         */
        clnt_perror(cl, wallhost);
        exit(1);
    }

    exit(0);
}

void
makemsg(fname)
    char *fname;
{
    struct tm *lt;
    struct passwd *pw;
    struct stat sbuf;
    time_t now;
    FILE *fp;
    int fd;
    char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[32];

    (void)strcpy(tmpname, _PATH_TMP);
    (void)strcat(tmpname, "/wall.XXXXXX");
    if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) {
        (void)fprintf(stderr, "wall: can't open temporary file.\n");
        exit(1);
    }
    (void)unlink(tmpname);

    if (!(whom = getlogin()))
        whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    (void)gethostname(hostname, sizeof(hostname));
    (void)time(&now);
    lt = localtime(&now);

    /*
     * all this stuff is to blank out a square for the message;
     * we wrap message lines at column 79, not 80, because some
     * terminals wrap after 79, some do not, and we can't tell.
     * Which means that we may leave a non-blank character
     * in column 80, but that can't be helped.
     */
    (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
        whom, hostname);
    (void)fprintf(fp, "        (%s) at %d:%02d ...\n", ttyname(2),
        lt->tm_hour, lt->tm_min);

    putc('\n', fp);

    if (fname && !(freopen(fname, "r", stdin))) {
        (void)fprintf(stderr, "wall: can't read %s.\n", fname);
        exit(1);
    }
    while (fgets(lbuf, sizeof(lbuf), stdin))
        fputs(lbuf, fp);
    rewind(fp);

    if (fstat(fd, &sbuf)) {
        (void)fprintf(stderr, "wall: can't stat temporary file.\n");
        exit(1);
    }
    mbufsize = sbuf.st_size;
    if (!(mbuf = malloc((u_int)mbufsize))) {
        (void)fprintf(stderr, "wall: out of memory.\n");
        exit(1);
    }
    if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
        (void)fprintf(stderr, "wall: can't read temporary file.\n");
        exit(1);
    }
    (void)close(fd);
}