1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  *
22*7c478bd9Sstevel@tonic-gate  * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
23*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
24*7c478bd9Sstevel@tonic-gate  */
25*7c478bd9Sstevel@tonic-gate 
26*7c478bd9Sstevel@tonic-gate /*
27*7c478bd9Sstevel@tonic-gate  * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
28*7c478bd9Sstevel@tonic-gate  * All Rights Reserved.
29*7c478bd9Sstevel@tonic-gate  */
30*7c478bd9Sstevel@tonic-gate 
31*7c478bd9Sstevel@tonic-gate /*
32*7c478bd9Sstevel@tonic-gate  * University Copyright- Copyright (c) 1982, 1986, 1988
33*7c478bd9Sstevel@tonic-gate  * The Regents of the University of California.
34*7c478bd9Sstevel@tonic-gate  * All Rights Reserved.
35*7c478bd9Sstevel@tonic-gate  *
36*7c478bd9Sstevel@tonic-gate  * University Acknowledgment- Portions of this document are derived from
37*7c478bd9Sstevel@tonic-gate  * software developed by the University of California, Berkeley, and its
38*7c478bd9Sstevel@tonic-gate  * contributors.
39*7c478bd9Sstevel@tonic-gate  */
40*7c478bd9Sstevel@tonic-gate 
41*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
42*7c478bd9Sstevel@tonic-gate 
43*7c478bd9Sstevel@tonic-gate /*
44*7c478bd9Sstevel@tonic-gate  * Invoked by the Internet daemon to handle talk requests
45*7c478bd9Sstevel@tonic-gate  * Processes talk requests until MAX_LIFE seconds go by with
46*7c478bd9Sstevel@tonic-gate  * no action, then dies.
47*7c478bd9Sstevel@tonic-gate  */
48*7c478bd9Sstevel@tonic-gate 
49*7c478bd9Sstevel@tonic-gate #include <stdio.h>
50*7c478bd9Sstevel@tonic-gate #include <errno.h>
51*7c478bd9Sstevel@tonic-gate #include <sys/ioctl.h>
52*7c478bd9Sstevel@tonic-gate #include <sys/time.h>
53*7c478bd9Sstevel@tonic-gate #include <sys/systeminfo.h>
54*7c478bd9Sstevel@tonic-gate #include <sys/wait.h>
55*7c478bd9Sstevel@tonic-gate #include <unistd.h>
56*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
57*7c478bd9Sstevel@tonic-gate #include <string.h>
58*7c478bd9Sstevel@tonic-gate #include "talkd_impl.h"
59*7c478bd9Sstevel@tonic-gate 
60*7c478bd9Sstevel@tonic-gate static CTL_MSG request;
61*7c478bd9Sstevel@tonic-gate static CTL_RESPONSE response;
62*7c478bd9Sstevel@tonic-gate 
63*7c478bd9Sstevel@tonic-gate char hostname[HOST_NAME_LENGTH];
64*7c478bd9Sstevel@tonic-gate int debug = 0;
65*7c478bd9Sstevel@tonic-gate 
66*7c478bd9Sstevel@tonic-gate static CTL_MSG swapmsg(CTL_MSG req);
67*7c478bd9Sstevel@tonic-gate 
68*7c478bd9Sstevel@tonic-gate int
main()69*7c478bd9Sstevel@tonic-gate main()
70*7c478bd9Sstevel@tonic-gate {
71*7c478bd9Sstevel@tonic-gate 	struct sockaddr_in from;
72*7c478bd9Sstevel@tonic-gate 	socklen_t from_size = (socklen_t)sizeof (from);
73*7c478bd9Sstevel@tonic-gate 	int cc;
74*7c478bd9Sstevel@tonic-gate 	int name_length = sizeof (hostname);
75*7c478bd9Sstevel@tonic-gate 	fd_set rfds;
76*7c478bd9Sstevel@tonic-gate 	struct timeval tv;
77*7c478bd9Sstevel@tonic-gate 
78*7c478bd9Sstevel@tonic-gate 	(void) sysinfo(SI_HOSTNAME, hostname, name_length);
79*7c478bd9Sstevel@tonic-gate 
80*7c478bd9Sstevel@tonic-gate 	for (;;) {
81*7c478bd9Sstevel@tonic-gate 		tv.tv_sec = MAX_LIFE;
82*7c478bd9Sstevel@tonic-gate 		tv.tv_usec = 0;
83*7c478bd9Sstevel@tonic-gate 		FD_ZERO(&rfds);
84*7c478bd9Sstevel@tonic-gate 		FD_SET(0, &rfds);
85*7c478bd9Sstevel@tonic-gate 		if (select(1, &rfds, 0, 0, &tv) <= 0)
86*7c478bd9Sstevel@tonic-gate 			return (0);
87*7c478bd9Sstevel@tonic-gate 		cc = recvfrom(0, (char *)&request, sizeof (request), 0,
88*7c478bd9Sstevel@tonic-gate 		    (struct sockaddr *)&from, &from_size);
89*7c478bd9Sstevel@tonic-gate 
90*7c478bd9Sstevel@tonic-gate 		if (cc != sizeof (request)) {
91*7c478bd9Sstevel@tonic-gate 			if (cc < 0 && errno != EINTR) {
92*7c478bd9Sstevel@tonic-gate 				print_error("receive");
93*7c478bd9Sstevel@tonic-gate 			}
94*7c478bd9Sstevel@tonic-gate 		} else {
95*7c478bd9Sstevel@tonic-gate 
96*7c478bd9Sstevel@tonic-gate 			if (debug) {
97*7c478bd9Sstevel@tonic-gate 				(void) printf("Request received : \n");
98*7c478bd9Sstevel@tonic-gate 				(void) print_request(&request);
99*7c478bd9Sstevel@tonic-gate 			}
100*7c478bd9Sstevel@tonic-gate 
101*7c478bd9Sstevel@tonic-gate 			request = swapmsg(request);
102*7c478bd9Sstevel@tonic-gate 			process_request(&request, &response);
103*7c478bd9Sstevel@tonic-gate 
104*7c478bd9Sstevel@tonic-gate 			if (debug) {
105*7c478bd9Sstevel@tonic-gate 				(void) printf("Response sent : \n");
106*7c478bd9Sstevel@tonic-gate 				print_response(&response);
107*7c478bd9Sstevel@tonic-gate 			}
108*7c478bd9Sstevel@tonic-gate 
109*7c478bd9Sstevel@tonic-gate 			/*
110*7c478bd9Sstevel@tonic-gate 			 * Can block here, is this what I want?
111*7c478bd9Sstevel@tonic-gate 			 */
112*7c478bd9Sstevel@tonic-gate 			cc = sendto(0, (char *)&response, sizeof (response), 0,
113*7c478bd9Sstevel@tonic-gate 			    (struct sockaddr *)&request.ctl_addr,
114*7c478bd9Sstevel@tonic-gate 			    (socklen_t)sizeof (request.ctl_addr));
115*7c478bd9Sstevel@tonic-gate 
116*7c478bd9Sstevel@tonic-gate 			if (cc != sizeof (response)) {
117*7c478bd9Sstevel@tonic-gate 				print_error("Send");
118*7c478bd9Sstevel@tonic-gate 			}
119*7c478bd9Sstevel@tonic-gate 		}
120*7c478bd9Sstevel@tonic-gate 	}
121*7c478bd9Sstevel@tonic-gate }
122*7c478bd9Sstevel@tonic-gate 
123*7c478bd9Sstevel@tonic-gate void
print_error(char * string)124*7c478bd9Sstevel@tonic-gate print_error(char *string)
125*7c478bd9Sstevel@tonic-gate {
126*7c478bd9Sstevel@tonic-gate 	FILE *cons;
127*7c478bd9Sstevel@tonic-gate 	char *err_dev = "/dev/console";
128*7c478bd9Sstevel@tonic-gate 	char *sys;
129*7c478bd9Sstevel@tonic-gate 	pid_t val, pid;
130*7c478bd9Sstevel@tonic-gate 
131*7c478bd9Sstevel@tonic-gate 	if (debug)
132*7c478bd9Sstevel@tonic-gate 		err_dev = "/dev/tty";
133*7c478bd9Sstevel@tonic-gate 
134*7c478bd9Sstevel@tonic-gate 	if ((sys = strerror(errno)) == (char *)NULL)
135*7c478bd9Sstevel@tonic-gate 	    sys = "Unknown error";
136*7c478bd9Sstevel@tonic-gate 
137*7c478bd9Sstevel@tonic-gate 	/* don't ever open tty's directly, let a child do it */
138*7c478bd9Sstevel@tonic-gate 	if ((pid = fork()) == 0) {
139*7c478bd9Sstevel@tonic-gate 		cons = fopen(err_dev, "a");
140*7c478bd9Sstevel@tonic-gate 		if (cons != NULL) {
141*7c478bd9Sstevel@tonic-gate 			(void) fprintf(cons, "Talkd : %s : %s(%d)\n\r", string,
142*7c478bd9Sstevel@tonic-gate 			    sys, errno);
143*7c478bd9Sstevel@tonic-gate 			(void) fclose(cons);
144*7c478bd9Sstevel@tonic-gate 		}
145*7c478bd9Sstevel@tonic-gate 		exit(0);
146*7c478bd9Sstevel@tonic-gate 	} else {
147*7c478bd9Sstevel@tonic-gate 		/* wait for the child process to return */
148*7c478bd9Sstevel@tonic-gate 		do {
149*7c478bd9Sstevel@tonic-gate 			val = wait(0);
150*7c478bd9Sstevel@tonic-gate 			if (val == (pid_t)-1) {
151*7c478bd9Sstevel@tonic-gate 				if (errno == EINTR) {
152*7c478bd9Sstevel@tonic-gate 					continue;
153*7c478bd9Sstevel@tonic-gate 				} else if (errno == ECHILD) {
154*7c478bd9Sstevel@tonic-gate 					break;
155*7c478bd9Sstevel@tonic-gate 				}
156*7c478bd9Sstevel@tonic-gate 			}
157*7c478bd9Sstevel@tonic-gate 		} while (val != pid);
158*7c478bd9Sstevel@tonic-gate 	}
159*7c478bd9Sstevel@tonic-gate }
160*7c478bd9Sstevel@tonic-gate 
161*7c478bd9Sstevel@tonic-gate #define	swapshort(a) (((a << 8) | ((unsigned short) a >> 8)) & 0xffff)
162*7c478bd9Sstevel@tonic-gate #define	swaplong(a) ((swapshort(a) << 16) | (swapshort(((unsigned)a >> 16))))
163*7c478bd9Sstevel@tonic-gate 
164*7c478bd9Sstevel@tonic-gate /*
165*7c478bd9Sstevel@tonic-gate  * Heuristic to detect if need to swap bytes.
166*7c478bd9Sstevel@tonic-gate  */
167*7c478bd9Sstevel@tonic-gate 
168*7c478bd9Sstevel@tonic-gate static CTL_MSG
swapmsg(CTL_MSG req)169*7c478bd9Sstevel@tonic-gate swapmsg(CTL_MSG req)
170*7c478bd9Sstevel@tonic-gate {
171*7c478bd9Sstevel@tonic-gate 	CTL_MSG swapreq;
172*7c478bd9Sstevel@tonic-gate 
173*7c478bd9Sstevel@tonic-gate 	if (req.ctl_addr.sin_family == swapshort(AF_INET)) {
174*7c478bd9Sstevel@tonic-gate 		swapreq = req;
175*7c478bd9Sstevel@tonic-gate 		swapreq.id_num = swaplong(req.id_num);
176*7c478bd9Sstevel@tonic-gate 		swapreq.pid = swaplong(req.pid);
177*7c478bd9Sstevel@tonic-gate 		swapreq.addr.sin_family = swapshort(req.addr.sin_family);
178*7c478bd9Sstevel@tonic-gate 		swapreq.ctl_addr.sin_family =
179*7c478bd9Sstevel@tonic-gate 			swapshort(req.ctl_addr.sin_family);
180*7c478bd9Sstevel@tonic-gate 		return (swapreq);
181*7c478bd9Sstevel@tonic-gate 	} else {
182*7c478bd9Sstevel@tonic-gate 		return (req);
183*7c478bd9Sstevel@tonic-gate 	}
184*7c478bd9Sstevel@tonic-gate }
185