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
26 /*
27 * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
28 * All Rights Reserved.
29 */
30
31 /*
32 * University Copyright- Copyright (c) 1982, 1986, 1988
33 * The Regents of the University of California.
34 * All Rights Reserved.
35 *
36 * University Acknowledgment- Portions of this document are derived from
37 * software developed by the University of California, Berkeley, and its
38 * contributors.
39 */
40
41 #pragma ident "%Z%%M% %I% %E% SMI"
42
43 /*
44 * Invoked by the Internet daemon to handle talk requests
45 * Processes talk requests until MAX_LIFE seconds go by with
46 * no action, then dies.
47 */
48
49 #include <stdio.h>
50 #include <errno.h>
51 #include <sys/ioctl.h>
52 #include <sys/time.h>
53 #include <sys/systeminfo.h>
54 #include <sys/wait.h>
55 #include <unistd.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include "talkd_impl.h"
59
60 static CTL_MSG request;
61 static CTL_RESPONSE response;
62
63 char hostname[HOST_NAME_LENGTH];
64 int debug = 0;
65
66 static CTL_MSG swapmsg(CTL_MSG req);
67
68 int
main()69 main()
70 {
71 struct sockaddr_in from;
72 socklen_t from_size = (socklen_t)sizeof (from);
73 int cc;
74 int name_length = sizeof (hostname);
75 fd_set rfds;
76 struct timeval tv;
77
78 (void) sysinfo(SI_HOSTNAME, hostname, name_length);
79
80 for (;;) {
81 tv.tv_sec = MAX_LIFE;
82 tv.tv_usec = 0;
83 FD_ZERO(&rfds);
84 FD_SET(0, &rfds);
85 if (select(1, &rfds, 0, 0, &tv) <= 0)
86 return (0);
87 cc = recvfrom(0, (char *)&request, sizeof (request), 0,
88 (struct sockaddr *)&from, &from_size);
89
90 if (cc != sizeof (request)) {
91 if (cc < 0 && errno != EINTR) {
92 print_error("receive");
93 }
94 } else {
95
96 if (debug) {
97 (void) printf("Request received : \n");
98 (void) print_request(&request);
99 }
100
101 request = swapmsg(request);
102 process_request(&request, &response);
103
104 if (debug) {
105 (void) printf("Response sent : \n");
106 print_response(&response);
107 }
108
109 /*
110 * Can block here, is this what I want?
111 */
112 cc = sendto(0, (char *)&response, sizeof (response), 0,
113 (struct sockaddr *)&request.ctl_addr,
114 (socklen_t)sizeof (request.ctl_addr));
115
116 if (cc != sizeof (response)) {
117 print_error("Send");
118 }
119 }
120 }
121 }
122
123 void
print_error(char * string)124 print_error(char *string)
125 {
126 FILE *cons;
127 char *err_dev = "/dev/console";
128 char *sys;
129 pid_t val, pid;
130
131 if (debug)
132 err_dev = "/dev/tty";
133
134 if ((sys = strerror(errno)) == (char *)NULL)
135 sys = "Unknown error";
136
137 /* don't ever open tty's directly, let a child do it */
138 if ((pid = fork()) == 0) {
139 cons = fopen(err_dev, "a");
140 if (cons != NULL) {
141 (void) fprintf(cons, "Talkd : %s : %s(%d)\n\r", string,
142 sys, errno);
143 (void) fclose(cons);
144 }
145 exit(0);
146 } else {
147 /* wait for the child process to return */
148 do {
149 val = wait(0);
150 if (val == (pid_t)-1) {
151 if (errno == EINTR) {
152 continue;
153 } else if (errno == ECHILD) {
154 break;
155 }
156 }
157 } while (val != pid);
158 }
159 }
160
161 #define swapshort(a) (((a << 8) | ((unsigned short) a >> 8)) & 0xffff)
162 #define swaplong(a) ((swapshort(a) << 16) | (swapshort(((unsigned)a >> 16))))
163
164 /*
165 * Heuristic to detect if need to swap bytes.
166 */
167
168 static CTL_MSG
swapmsg(CTL_MSG req)169 swapmsg(CTL_MSG req)
170 {
171 CTL_MSG swapreq;
172
173 if (req.ctl_addr.sin_family == swapshort(AF_INET)) {
174 swapreq = req;
175 swapreq.id_num = swaplong(req.id_num);
176 swapreq.pid = swaplong(req.pid);
177 swapreq.addr.sin_family = swapshort(req.addr.sin_family);
178 swapreq.ctl_addr.sin_family =
179 swapshort(req.ctl_addr.sin_family);
180 return (swapreq);
181 } else {
182 return (req);
183 }
184 }
185