rwall.c revision 1.15
1 /* $NetBSD: rwall.c,v 1.15 2003/08/07 11:15:46 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1990 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1993 Christopher G. Demetriou 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by the University of 46 * California, Berkeley and its contributors. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 #ifndef lint 66 __COPYRIGHT("@(#) Copyright (c) 1988 Regents of the University of California.\n\ 67 All rights reserved.\n"); 68 #endif /* not lint */ 69 70 #ifndef lint 71 #if 0 72 static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; 73 #else 74 __RCSID("$NetBSD: rwall.c,v 1.15 2003/08/07 11:15:46 agc Exp $"); 75 #endif 76 #endif /* not lint */ 77 78 /* 79 * This program is not related to David Wall, whose Stanford Ph.D. thesis 80 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 81 */ 82 #include <sys/types.h> 83 #include <sys/param.h> 84 #include <sys/stat.h> 85 #include <err.h> 86 #include <paths.h> 87 #include <pwd.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <time.h> 92 #include <unistd.h> 93 94 #include <rpc/rpc.h> 95 #include <rpcsvc/rwall.h> 96 97 struct timeval timeout = { 25, 0 }; 98 int mbufsize; 99 char *mbuf; 100 101 int main __P((int, char **)); 102 void makemsg __P((char *)); 103 104 int 105 main(argc, argv) 106 int argc; 107 char **argv; 108 { 109 char *wallhost, res; 110 CLIENT *cl; 111 112 if ((argc < 2) || (argc > 3)) { 113 fprintf(stderr, "usage: %s hostname [file]\n", argv[0]); 114 exit(1); 115 } 116 117 wallhost = argv[1]; 118 119 makemsg(argv[2]); 120 121 /* 122 * Create client "handle" used for calling MESSAGEPROG on the 123 * server designated on the command line. We tell the rpc package 124 * to use the "tcp" protocol when contacting the server. 125 */ 126 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 127 if (cl == NULL) { 128 /* 129 * Couldn't establish connection with server. 130 * Print error message and die. 131 */ 132 clnt_pcreateerror(wallhost); 133 exit(1); 134 } 135 136 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, (caddr_t)&mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) { 137 /* 138 * An error occurred while calling the server. 139 * Print error message and die. 140 */ 141 clnt_perror(cl, wallhost); 142 exit(1); 143 } 144 145 exit(0); 146 } 147 148 void 149 makemsg(fname) 150 char *fname; 151 { 152 struct tm *lt; 153 struct passwd *pw; 154 struct stat sbuf; 155 time_t now; 156 FILE *fp; 157 int fd; 158 const char *whom; 159 char *tty, tmpname[32], lbuf[100], hostname[MAXHOSTNAMELEN + 1]; 160 161 (void)strcpy(tmpname, _PATH_TMP); 162 (void)strcat(tmpname, "/wall.XXXXXX"); 163 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 164 err(1, "can't open temporary file."); 165 (void)unlink(tmpname); 166 167 if (!(whom = getlogin())) 168 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 169 (void)gethostname(hostname, sizeof(hostname)); 170 hostname[sizeof(hostname) - 1] = '\0'; 171 (void)time(&now); 172 lt = localtime(&now); 173 174 /* 175 * all this stuff is to blank out a square for the message; 176 * we wrap message lines at column 79, not 80, because some 177 * terminals wrap after 79, some do not, and we can't tell. 178 * Which means that we may leave a non-blank character 179 * in column 80, but that can't be helped. 180 */ 181 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", 182 whom, hostname); 183 tty = ttyname(STDERR_FILENO); 184 if (tty == NULL) 185 tty = "??"; 186 (void)fprintf(fp, " (%s) at %d:%02d ...\n", tty, lt->tm_hour, 187 lt->tm_min); 188 189 putc('\n', fp); 190 191 if (fname && !(freopen(fname, "r", stdin))) 192 err(1, "can't read %s.", fname); 193 while (fgets(lbuf, sizeof(lbuf), stdin)) 194 fputs(lbuf, fp); 195 rewind(fp); 196 197 if (fstat(fd, &sbuf)) 198 err(1, "can't stat temporary file."); 199 mbufsize = sbuf.st_size; 200 if (!(mbuf = malloc((u_int)mbufsize))) 201 err(1, "malloc"); 202 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 203 err(1, "can't read temporary file."); 204 (void)close(fd); 205 } 206
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