Annotation of src/usr.bin/rwall/rwall.c, Revision 1.1
1.1 ! deraadt 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: 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: /*static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/
! 43: static char rcsid[] = "$Id: rwall.c,v 1.5 1993/12/10 19:24:39 jtc Exp $";
! 44: #endif /* not lint */
! 45:
! 46: /*
! 47: * This program is not related to David Wall, whose Stanford Ph.D. thesis
! 48: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
! 49: */
! 50:
! 51: #include <stdio.h>
! 52: #include <stdlib.h>
! 53: #include <string.h>
! 54: #include <time.h>
! 55: #include <sys/param.h>
! 56: #include <sys/types.h>
! 57: #include <sys/stat.h>
! 58: #include <pwd.h>
! 59: #include <unistd.h>
! 60: #include <paths.h>
! 61:
! 62: #include <rpc/rpc.h>
! 63: #include <rpcsvc/rwall.h>
! 64:
! 65: struct timeval timeout = { 25, 0 };
! 66: int mbufsize;
! 67: char *mbuf;
! 68:
! 69: void makemsg ();
! 70:
! 71: int
! 72: main(argc, argv)
! 73: int argc;
! 74: char **argv;
! 75: {
! 76: char *wallhost, res;
! 77: CLIENT *cl;
! 78:
! 79: if ((argc < 2) || (argc > 3)) {
! 80: fprintf(stderr, "usage: %s hostname [file]\n", argv[0]);
! 81: exit(1);
! 82: }
! 83:
! 84: wallhost = argv[1];
! 85:
! 86: makemsg(argv[2]);
! 87:
! 88: /*
! 89: * Create client "handle" used for calling MESSAGEPROG on the
! 90: * server designated on the command line. We tell the rpc package
! 91: * to use the "tcp" protocol when contacting the server.
! 92: */
! 93: cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
! 94: if (cl == NULL) {
! 95: /*
! 96: * Couldn't establish connection with server.
! 97: * Print error message and die.
! 98: */
! 99: clnt_pcreateerror(wallhost);
! 100: exit(1);
! 101: }
! 102:
! 103: if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) {
! 104: /*
! 105: * An error occurred while calling the server.
! 106: * Print error message and die.
! 107: */
! 108: clnt_perror(cl, wallhost);
! 109: exit(1);
! 110: }
! 111:
! 112: exit(0);
! 113: }
! 114:
! 115: void
! 116: makemsg(fname)
! 117: char *fname;
! 118: {
! 119: struct tm *lt;
! 120: struct passwd *pw;
! 121: struct stat sbuf;
! 122: time_t now;
! 123: FILE *fp;
! 124: int fd;
! 125: char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[32];
! 126:
! 127: (void)strcpy(tmpname, _PATH_TMP);
! 128: (void)strcat(tmpname, "/wall.XXXXXX");
! 129: if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) {
! 130: (void)fprintf(stderr, "wall: can't open temporary file.\n");
! 131: exit(1);
! 132: }
! 133: (void)unlink(tmpname);
! 134:
! 135: if (!(whom = getlogin()))
! 136: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
! 137: (void)gethostname(hostname, sizeof(hostname));
! 138: (void)time(&now);
! 139: lt = localtime(&now);
! 140:
! 141: /*
! 142: * all this stuff is to blank out a square for the message;
! 143: * we wrap message lines at column 79, not 80, because some
! 144: * terminals wrap after 79, some do not, and we can't tell.
! 145: * Which means that we may leave a non-blank character
! 146: * in column 80, but that can't be helped.
! 147: */
! 148: (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
! 149: whom, hostname);
! 150: (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2),
! 151: lt->tm_hour, lt->tm_min);
! 152:
! 153: putc('\n', fp);
! 154:
! 155: if (fname && !(freopen(fname, "r", stdin))) {
! 156: (void)fprintf(stderr, "wall: can't read %s.\n", fname);
! 157: exit(1);
! 158: }
! 159: while (fgets(lbuf, sizeof(lbuf), stdin))
! 160: fputs(lbuf, fp);
! 161: rewind(fp);
! 162:
! 163: if (fstat(fd, &sbuf)) {
! 164: (void)fprintf(stderr, "wall: can't stat temporary file.\n");
! 165: exit(1);
! 166: }
! 167: mbufsize = sbuf.st_size;
! 168: if (!(mbuf = malloc((u_int)mbufsize))) {
! 169: (void)fprintf(stderr, "wall: out of memory.\n");
! 170: exit(1);
! 171: }
! 172: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
! 173: (void)fprintf(stderr, "wall: can't read temporary file.\n");
! 174: exit(1);
! 175: }
! 176: (void)close(fd);
! 177: }
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