1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 * 22 * Copyright 2002 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 26 /* All Rights Reserved */ 27 /* 28 * University Copyright- Copyright (c) 1982, 1986, 1988 29 * The Regents of the University of California 30 * All Rights Reserved 31 * 32 * University Acknowledgment- Portions of this document are derived from 33 * software developed by the University of California, Berkeley, and its 34 * contributors. 35 */ 36 37 #pragma ident "%Z%%M% %I% %E% SMI" 38 39 /* 40 * rwall_subr.c 41 * The server procedure for rwalld 42 */ 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <rpc/rpc.h> 48 #include <thread.h> 49 #include <rpcsvc/rwall.h> 50 #include <sys/types.h> 51 #include <sys/stat.h> 52 #include <syslog.h> 53 #include <string.h> 54 55 #define WALL_PROG "/usr/sbin/wall" 56 57 static mutex_t wall_mutex = DEFAULTMUTEX; 58 static char *oldmsg; 59 60 /* ARGSUSED */ 61 bool_t 62 wallproc_wall_1_svc(wrapstring *argp, void *res, struct svc_req *rqstp) 63 { 64 char *msg; 65 FILE *fp; 66 int rval; 67 struct stat wall; 68 69 msg = *argp; 70 71 /* 72 * Do not wall the same message twice in case of a retransmission 73 * in the rare case that two walls arrive close enough with 74 * a retransmission we might get a duplicate, but that is OK. 75 */ 76 (void) mutex_lock(&wall_mutex); 77 if ((oldmsg != 0) && (strcmp(msg, oldmsg) == 0)) { 78 (void) mutex_unlock(&wall_mutex); 79 return (TRUE); 80 } 81 82 if (oldmsg) 83 free(oldmsg); 84 oldmsg = strdup(msg); 85 86 rval = stat(WALL_PROG, &wall); 87 88 /* 89 * Make sure the wall programs exists, is executeable, and runs 90 */ 91 if (rval == -1 || (wall.st_mode & S_IXUSR) == 0 || 92 (fp = popen(WALL_PROG, "w")) == NULL) { 93 syslog(LOG_NOTICE, 94 "rwall message received but could not execute %s", 95 WALL_PROG); 96 syslog(LOG_NOTICE, "%s", msg); 97 #ifdef DEBUG 98 (void) fprintf(stderr, 99 "rwall message received but could not execute %s", 100 WALL_PROG); 101 (void) fprintf(stderr, "%s", msg); 102 #endif 103 (void) mutex_unlock(&wall_mutex); 104 return (TRUE); 105 } 106 107 (void) fprintf(fp, "%s", msg); 108 (void) pclose(fp); 109 (void) mutex_unlock(&wall_mutex); 110 111 return (TRUE); 112 } 113 114 /* ARGSUSED */ 115 int 116 wallprog_1_freeresult(SVCXPRT *transp, xdrproc_t proc, caddr_t arg) 117 { 118 return (TRUE); 119 } 120