| 1 | /* |
| 2 | * Copyright (c) 1993 Christopher G. Demetriou |
| 3 | * Copyright (c) 1988, 1990 Regents of the University of California. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. All advertising materials mentioning features or use of this software |
| 15 | * must display the following acknowledgement: |
| 16 | * This product includes software developed by the University of |
| 17 | * California, Berkeley and its contributors. |
| 18 | * 4. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #ifndef lint |
| 36 | static const char copyright[] = |
| 37 | "@(#) Copyright (c) 1988 Regents of the University of California.\n\ |
| 38 | All rights reserved.\n"; |
| 39 | #endif /* not lint */ |
| 40 | |
| 41 | #ifndef lint |
| 42 | #if 0 |
| 43 | static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; |
| 44 | #endif |
| 45 | static const char rcsid[] = |
| 46 | "$FreeBSD: src/usr.bin/rwall/rwall.c,v 1.8.2.1 2001/02/18 02:27:54 kris Exp $"; |
| 47 | #endif /* not lint */ |
| 48 | |
| 49 | /* |
| 50 | * This program is not related to David Wall, whose Stanford Ph.D. thesis |
| 51 | * is entitled "Mechanisms for Broadcast and Selective Broadcast". |
| 52 | */ |
| 53 | |
| 54 | #include <sys/param.h> |
| 55 | #include <sys/stat.h> |
| 56 | #include <sys/time.h> |
| 57 | #include <sys/uio.h> |
| 58 | #include <err.h> |
| 59 | #include <paths.h> |
| 60 | #include <pwd.h> |
| 61 | #include <stdio.h> |
| 62 | #include <stdlib.h> |
| 63 | #include <string.h> |
| 64 | #include <time.h> |
| 65 | #include <unistd.h> |
| 66 | #include <utmp.h> |
| 67 | |
| 68 | #include <rpc/rpc.h> |
| 69 | #include <rpcsvc/rwall.h> |
| 70 | |
| 71 | int mbufsize; |
| 72 | char *mbuf; |
| 73 | |
| 74 | void makemsg __P((char *)); |
| 75 | static void usage __P((void)); |
| 76 | char *ttymsg __P((struct iovec *, int, char *, int)); |
| 77 | |
| 78 | /* ARGSUSED */ |
| 79 | int |
| 80 | main(argc, argv) |
| 81 | int argc; |
| 82 | char **argv; |
| 83 | { |
| 84 | char *wallhost, res; |
| 85 | CLIENT *cl; |
| 86 | struct timeval tv; |
| 87 | |
| 88 | if ((argc < 2) || (argc > 3)) |
| 89 | usage(); |
| 90 | |
| 91 | wallhost = argv[1]; |
| 92 | |
| 93 | makemsg(argv[2]); |
| 94 | |
| 95 | /* |
| 96 | * Create client "handle" used for calling MESSAGEPROG on the |
| 97 | * server designated on the command line. We tell the rpc package |
| 98 | * to use the "tcp" protocol when contacting the server. |
| 99 | */ |
| 100 | cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); |
| 101 | if (cl == NULL) { |
| 102 | /* |
| 103 | * Couldn't establish connection with server. |
| 104 | * Print error message and die. |
| 105 | */ |
| 106 | errx(1, "%s", clnt_spcreateerror(wallhost)); |
| 107 | } |
| 108 | |
| 109 | tv.tv_sec = 15; /* XXX ?? */ |
| 110 | tv.tv_usec = 0; |
| 111 | if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, tv) != RPC_SUCCESS) { |
| 112 | /* |
| 113 | * An error occurred while calling the server. |
| 114 | * Print error message and die. |
| 115 | */ |
| 116 | errx(1, "%s", clnt_sperror(cl, wallhost)); |
| 117 | } |
| 118 | |
| 119 | exit(0); |
| 120 | } |
| 121 | |
| 122 | static void |
| 123 | usage() |
| 124 | { |
| 125 | (void)fprintf(stderr, "usage: rwall hostname [file]\n"); |
| 126 | exit(1); |
| 127 | } |
| 128 | |
| 129 | void |
| 130 | makemsg(fname) |
| 131 | char *fname; |
| 132 | { |
| 133 | struct tm *lt; |
| 134 | struct passwd *pw; |
| 135 | struct stat sbuf; |
| 136 | time_t now; |
| 137 | FILE *fp; |
| 138 | int fd; |
| 139 | char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; |
| 140 | const char *whom; |
| 141 | |
| 142 | (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); |
| 143 | if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) |
| 144 | err(1, "can't open temporary file"); |
| 145 | (void)unlink(tmpname); |
| 146 | |
| 147 | if (!(whom = getlogin())) |
| 148 | whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; |
| 149 | (void)gethostname(hostname, sizeof(hostname)); |
| 150 | (void)time(&now); |
| 151 | lt = localtime(&now); |
| 152 | |
| 153 | /* |
| 154 | * all this stuff is to blank out a square for the message; |
| 155 | * we wrap message lines at column 79, not 80, because some |
| 156 | * terminals wrap after 79, some do not, and we can't tell. |
| 157 | * Which means that we may leave a non-blank character |
| 158 | * in column 80, but that can't be helped. |
| 159 | */ |
| 160 | (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", |
| 161 | whom, hostname); |
| 162 | tty = ttyname(STDERR_FILENO); |
| 163 | if (tty == NULL) |
| 164 | tty = "no tty"; |
| 165 | (void)fprintf(fp, " (%s) at %d:%02d ...\n", tty, |
| 166 | lt->tm_hour, lt->tm_min); |
| 167 | |
| 168 | putc('\n', fp); |
| 169 | |
| 170 | if (fname && !(freopen(fname, "r", stdin))) |
| 171 | err(1, "can't read %s", fname); |
| 172 | while (fgets(lbuf, sizeof(lbuf), stdin)) |
| 173 | fputs(lbuf, fp); |
| 174 | rewind(fp); |
| 175 | |
| 176 | if (fstat(fd, &sbuf)) |
| 177 | err(1, "can't stat temporary file"); |
| 178 | mbufsize = sbuf.st_size; |
| 179 | if (!(mbuf = malloc((u_int)mbufsize))) |
| 180 | err(1, "out of memory"); |
| 181 | if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) |
| 182 | err(1, "can't read temporary file"); |
| 183 | (void)close(fd); |
| 184 | } |