File:  [DragonFly] / src / libexec / rpc.rwalld / rwalld.c
Revision 1.3: download - view: text, annotated - select for diffs
Fri Nov 14 03:54:31 2003 UTC (10 years, 10 months ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_Stable, DragonFly_Snap29Sep2004, DragonFly_Snap13Sep2004, DragonFly_RELEASE_2_0_Slip, DragonFly_RELEASE_2_0, DragonFly_RELEASE_1_8_Slip, DragonFly_RELEASE_1_8, DragonFly_RELEASE_1_6_Slip, DragonFly_RELEASE_1_6, DragonFly_RELEASE_1_4_Slip, DragonFly_RELEASE_1_4, DragonFly_RELEASE_1_2_Slip, DragonFly_RELEASE_1_2, DragonFly_RELEASE_1_12_Slip, DragonFly_RELEASE_1_12, DragonFly_RELEASE_1_10_Slip, DragonFly_RELEASE_1_10, DragonFly_Preview, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
__P removal.

Submitted-by: Craig Dooley <craig@xlnx-x.net>

    1: /*
    2:  * Copyright (c) 1993 Christopher G. Demetriou
    3:  * All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  * 3. The name of the author may not be used to endorse or promote
   14:  *    products derived from this software without specific prior written
   15:  *    permission.
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
   18:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   19:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   21:  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27:  * SUCH DAMAGE.
   28:  *
   29:  * $FreeBSD: src/libexec/rpc.rwalld/rwalld.c,v 1.8 1999/08/28 00:09:57 peter Exp $
   30:  * $DragonFly: src/libexec/rpc.rwalld/rwalld.c,v 1.3 2003/11/14 03:54:31 dillon Exp $
   31:  */
   32: 
   33: #include <err.h>
   34: #include <pwd.h>
   35: #include <signal.h>
   36: #include <stdio.h>
   37: #include <stdlib.h>
   38: #include <string.h>
   39: #include <syslog.h>
   40: #include <rpc/rpc.h>
   41: #include <rpc/pmap_clnt.h>
   42: #include <rpcsvc/rwall.h>
   43: #include <sys/socket.h>
   44: #include <sys/types.h>
   45: #include <sys/wait.h>
   46: #include <unistd.h>
   47: 
   48: #ifdef OSF
   49: #define WALL_CMD "/usr/sbin/wall"
   50: #else
   51: #define WALL_CMD "/usr/bin/wall -n"
   52: #endif
   53: 
   54: void wallprog_1();
   55: void possess();
   56: void killkids();
   57: static void usage (void);
   58: 
   59: int nodaemon = 0;
   60: int from_inetd = 1;
   61: 
   62: int
   63: main(argc, argv)
   64: 	int argc;
   65: 	char *argv[];
   66: {
   67: 	SVCXPRT *transp;
   68: 	int s, salen;
   69: 	struct sockaddr_in sa;
   70:         int sock = 0;
   71:         int proto = 0;
   72: 
   73: 	if (argc == 2 && !strcmp(argv[1], "-n"))
   74: 		nodaemon = 1;
   75: 	if (argc != 1 && !nodaemon)
   76: 		usage();
   77: 
   78: 	if (geteuid() == 0) {
   79: 		struct passwd *pep = getpwnam("nobody");
   80: 		if (pep)
   81: 			setuid(pep->pw_uid);
   82: 		else
   83: 			setuid(getuid());
   84: 	}
   85: 
   86:         /*
   87:          * See if inetd started us
   88:          */
   89: 	salen = sizeof(sa);
   90:         if (getsockname(0, (struct sockaddr *)&sa, &salen) < 0) {
   91:                 from_inetd = 0;
   92:                 sock = RPC_ANYSOCK;
   93:                 proto = IPPROTO_UDP;
   94:         }
   95: 
   96:         if (!from_inetd) {
   97:                 if (!nodaemon)
   98:                         possess();
   99: 
  100:                 (void)pmap_unset(WALLPROG, WALLVERS);
  101:                 if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
  102:                         err(1, "socket");
  103:                 bzero((char *)&sa, sizeof sa);
  104:                 if (bind(s, (struct sockaddr *)&sa, sizeof sa) < 0)
  105:                         err(1, "bind");
  106: 
  107:                 salen = sizeof sa;
  108:                 if (getsockname(s, (struct sockaddr *)&sa, &salen))
  109:                         err(1, "getsockname");
  110: 
  111:                 pmap_set(WALLPROG, WALLVERS, IPPROTO_UDP, ntohs(sa.sin_port));
  112:                 if (dup2(s, 0) < 0)
  113:                         err(1, "dup2");
  114:                 (void)pmap_unset(WALLPROG, WALLVERS);
  115:         }
  116: 
  117: 	(void)signal(SIGCHLD, killkids);
  118: 
  119: 	openlog("rpc.rwalld", LOG_CONS|LOG_PID, LOG_DAEMON);
  120: 
  121: 	transp = svcudp_create(sock);
  122: 	if (transp == NULL) {
  123: 		syslog(LOG_ERR, "cannot create udp service");
  124: 		exit(1);
  125: 	}
  126: 	if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, proto)) {
  127: 		syslog(LOG_ERR, "unable to register (WALLPROG, WALLVERS, %s)", proto?"udp":"(inetd)");
  128: 		exit(1);
  129: 	}
  130: 	svc_run();
  131: 	syslog(LOG_ERR, "svc_run returned");
  132: 	exit(1);
  133: }
  134: 
  135: static void
  136: usage()
  137: {
  138: 	fprintf(stderr, "usage: rpc.rwalld [-n]\n");
  139: 	exit(1);
  140: }
  141: 
  142: void possess()
  143: {
  144: 	daemon(0, 0);
  145: }
  146: 
  147: void killkids()
  148: {
  149: 	while(wait4(-1, NULL, WNOHANG, NULL) > 0)
  150: 		;
  151: }
  152: 
  153: void *wallproc_wall_1_svc(s, rqstp)
  154: 	wrapstring		*s;
  155: 	struct svc_req		*rqstp;
  156: {
  157: 	static void		*dummy = NULL;
  158: 
  159: 	/* fork, popen wall with special option, and send the message */
  160: 	if (fork() == 0) {
  161: 		FILE *pfp;
  162: 
  163: 		pfp = popen(WALL_CMD, "w");
  164: 		if (pfp != NULL) {
  165: 			fprintf(pfp, "\007\007%s", *s);
  166: 			pclose(pfp);
  167: 			exit(0);
  168: 		}
  169: 	}
  170: 	return(&dummy);
  171: }
  172: 
  173: void
  174: wallprog_1(rqstp, transp)
  175: 	struct svc_req *rqstp;
  176: 	SVCXPRT *transp;
  177: {
  178: 	union {
  179: 		char *wallproc_wall_1_arg;
  180: 	} argument;
  181: 	char *result;
  182: 	bool_t (*xdr_argument)(), (*xdr_result)();
  183: 	char *(*local)();
  184: 
  185: 	switch (rqstp->rq_proc) {
  186: 	case NULLPROC:
  187: 		(void)svc_sendreply(transp, xdr_void, (char *)NULL);
  188: 		goto leave;
  189: 
  190: 	case WALLPROC_WALL:
  191: 		xdr_argument = xdr_wrapstring;
  192: 		xdr_result = xdr_void;
  193: 		local = (char *(*)()) wallproc_wall_1_svc;
  194: 		break;
  195: 
  196: 	default:
  197: 		svcerr_noproc(transp);
  198: 		goto leave;
  199: 	}
  200: 	bzero((char *)&argument, sizeof(argument));
  201: 	if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument)) {
  202: 		svcerr_decode(transp);
  203: 		goto leave;
  204: 	}
  205: 	result = (*local)(&argument, rqstp);
  206: 	if (result != NULL && !svc_sendreply(transp, xdr_result, result)) {
  207: 		svcerr_systemerr(transp);
  208: 	}
  209: 	if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument)) {
  210: 		syslog(LOG_ERR, "unable to free arguments");
  211: 		exit(1);
  212: 	}
  213: leave:
  214:         if (from_inetd)
  215:                 exit(0);
  216: }