/* $NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $ */

/*
* 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. 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.
*/

/*
* Copyright (c) 1993 Christopher G. Demetriou
*
* 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988\
Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "from: @(#)wall.c        5.14 (Berkeley) 3/2/91";
#else
__RCSID("$NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $");
#endif
#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 <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

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

static struct timeval timeout = { 25, 0 };

static char *makemsg(const char *);

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

       setprogname(*argv);

       if ((argc < 2) || (argc > 3)) {
               (void)fprintf(stderr,
                   "Usage: %s hostname <file>\n", getprogname());
               return 1;
       }

       wallhost = argv[1];

       /*
        * 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);
               return 1;
       }

       mbuf = makemsg(argv[2]);

       if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, (void *)&mbuf,
           xdr_void, &res, timeout) != RPC_SUCCESS) {
               free(mbuf);
               /*
                * An error occurred while calling the server.
                * Print error message and die.
                */
               clnt_perror(cl, wallhost);
               return 1;
       }
       free(mbuf);
       return 0;
}

static char *
makemsg(const char *fname)
{
       struct tm *lt;
       struct passwd *pw;
       struct stat sbuf;
       time_t now;
       size_t mbufsize;
       char *mbuf;
       FILE *fp;
       int fd;
       const char *whom;
       const char *tty;
       char tmpname[MAXPATHLEN], lbuf[BUFSIZ], hostname[MAXHOSTNAMELEN + 1];

       (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
       if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL)
               err(1, "Can't open temporary file");
       (void)unlink(tmpname);

       if (!(whom = getlogin()))
               whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
       (void)gethostname(hostname, sizeof(hostname));
       hostname[sizeof(hostname) - 1] = '\0';
       (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);
       tty = ttyname(STDERR_FILENO);
       if (tty == NULL)
               tty = "??";
       (void)fprintf(fp, "        (%s) at %d:%02d ...\n", tty, lt->tm_hour,
           lt->tm_min);

       (void)putc('\n', fp);

       if (fname && !(freopen(fname, "r", stdin)))
               err(1, "Can't open `%s'", fname);
       while (fgets(lbuf, sizeof(lbuf), stdin))
               (void)fputs(lbuf, fp);
       rewind(fp);

       if (fstat(fd, &sbuf) == -1)
               err(1, "Can't stat temporary file.");
       mbufsize = (size_t)sbuf.st_size;
       if (!(mbuf = malloc((u_int)mbufsize)))
               err(1, "malloc");
       if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
               err(1, "Can't read temporary file.");
       (void)close(fd);
       return mbuf;
}

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