diff options
Diffstat (limited to 'usr.bin/rwall/rwall.c')
| -rw-r--r-- | usr.bin/rwall/rwall.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/usr.bin/rwall/rwall.c b/usr.bin/rwall/rwall.c new file mode 100644 index 000000000000..f4df2580d166 --- /dev/null +++ b/usr.bin/rwall/rwall.c @@ -0,0 +1,172 @@ +/*- + * SPDX-License-Identifier: BSD-4-Clause + * + * 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. + */ + +/* + * This program is not related to David Wall, whose Stanford Ph.D. thesis + * is entitled "Mechanisms for Broadcast and Selective Broadcast". + */ + +#include <sys/param.h> +#include <sys/stat.h> +#include <sys/uio.h> +#include <rpc/rpc.h> +#include <rpcsvc/rwall.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> + +static char *mbuf; + +static char notty[] = "no tty"; + +static void makemsg(const char *); +static void usage(void) __dead2; + +/* ARGSUSED */ +int +main(int argc, char *argv[]) +{ + char *wallhost, res; + CLIENT *cl; + struct timeval tv; + + if ((argc < 2) || (argc > 3)) + usage(); + + 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. + */ + errx(1, "%s", clnt_spcreateerror(wallhost)); + } + + tv.tv_sec = 15; /* XXX ?? */ + tv.tv_usec = 0; + if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, + (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { + /* + * An error occurred while calling the server. + * Print error message and die. + */ + errx(1, "%s", clnt_sperror(cl, wallhost)); + } + + return (0); +} + +static void +usage(void) +{ + fprintf(stderr, "usage: rwall host [file]\n"); + exit(1); +} + +static void +makemsg(const char *fname) +{ + struct tm *lt; + struct passwd *pw; + struct stat sbuf; + time_t now; + FILE *fp; + int fd; + size_t mbufsize; + char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; + const char *whom; + + 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"); + unlink(tmpname); + + whom = getlogin(); + if (!whom) { + pw = getpwuid(getuid()); + whom = pw ? pw->pw_name : "???"; + } + gethostname(hostname, sizeof(hostname)); + 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. + */ + fprintf(fp, "Remote Broadcast Message from %s@%s\n", + whom, hostname); + tty = ttyname(STDERR_FILENO); + if (tty == NULL) + tty = notty; + fprintf(fp, " (%s) at %d:%02d ...\n", tty, + lt->tm_hour, lt->tm_min); + + putc('\n', fp); + + if (fname && !(freopen(fname, "r", stdin))) + err(1, "can't read %s", fname); + while (fgets(lbuf, sizeof(lbuf), stdin)) + fputs(lbuf, fp); + rewind(fp); + + if (fstat(fd, &sbuf)) + err(1, "can't stat temporary file"); + mbufsize = (size_t)sbuf.st_size; + mbuf = malloc(mbufsize); + if (mbuf == NULL) + err(1, "out of memory"); + if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) + err(1, "can't read temporary file"); + close(fd); +} |