1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* $OpenBSD: ttylog.c,v 1.6 2017/09/11 18:21:08 bluhm Exp $ */
/*
* Copyright (c) 2015 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/ioctl.h>
#include <sys/sockio.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include <utmp.h>
__dead void usage(void);
void redirect(void);
void restore(void);
void timeout(int);
void terminate(int);
void iostdin(int);
FILE *lg;
char *console, *username, *tty;
int sfd;
__dead void
usage()
{
fprintf(stderr, "usage: %s /dev/console|username logfile\n",
getprogname());
exit(2);
}
int
main(int argc, char *argv[])
{
char buf[8192], ptyname[16], *logfile;
struct sigaction act;
sigset_t set;
ssize_t n;
int mfd;
if (argc != 3)
usage();
if (strcmp(argv[1], "/dev/console") == 0)
console = argv[1];
else
username = argv[1];
logfile = argv[2];
sigemptyset(&set);
sigaddset(&set, SIGTERM);
sigaddset(&set, SIGIO);
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
err(1, "sigprocmask block init");
if ((lg = fopen(logfile, "w")) == NULL)
err(1, "fopen %s", logfile);
if (setvbuf(lg, NULL, _IOLBF, 0) != 0)
err(1, "setlinebuf");
memset(&act, 0, sizeof(act));
act.sa_mask = set;
act.sa_flags = SA_RESTART;
act.sa_handler = terminate;
if (sigaction(SIGTERM, &act, NULL) == -1)
err(1, "sigaction SIGTERM");
if (sigaction(SIGINT, &act, NULL) == -1)
err(1, "sigaction SIGINT");
if (openpty(&mfd, &sfd, ptyname, NULL, NULL) == -1)
err(1, "openpty");
fprintf(lg, "openpty %s\n", ptyname);
if ((tty = strrchr(ptyname, '/')) == NULL)
errx(1, "tty: %s", ptyname);
tty++;
/* login(3) searches for a controlling tty, use the created one */
if (dup2(sfd, 1) == -1)
err(1, "dup2 stdout");
redirect();
act.sa_handler = iostdin;
if (sigaction(SIGIO, &act, NULL) == -1)
err(1, "sigaction SIGIO");
if (setpgid(0, 0) == -1)
err(1, "setpgid");
if (fcntl(0, F_SETOWN, getpid()) == -1)
err(1, "fcntl F_SETOWN");
if (fcntl(0, F_SETFL, O_ASYNC) == -1)
err(1, "fcntl O_ASYNC");
act.sa_handler = timeout;
if (sigaction(SIGALRM, &act, NULL) == -1)
err(1, "sigaction SIGALRM");
if (alarm(30) == (unsigned int)-1)
err(1, "alarm");
fprintf(lg, "%s: started\n", getprogname());
if (sigprocmask(SIG_UNBLOCK, &set, NULL) == -1)
err(1, "sigprocmask unblock init");
/* do not block signals during read, it has to be interrupted */
while ((n = read(mfd, buf, sizeof(buf))) > 0) {
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
err(1, "sigprocmask block write");
fprintf(lg, ">>> ");
if (fwrite(buf, 1, n, lg) != (size_t)n)
err(1, "fwrite %s", logfile);
if (buf[n-1] != '\n')
fprintf(lg, "\n");
if (sigprocmask(SIG_UNBLOCK, &set, NULL) == -1)
err(1, "sigprocmask unblock write");
}
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
err(1, "sigprocmask block exit");
if (n < 0)
err(1, "read %s", ptyname);
fprintf(lg, "EOF %s\n", ptyname);
restore();
errx(3, "EOF");
}
void
redirect(void)
{
struct utmp utmp;
int fd, on;
if (console) {
/* first remove any existing console redirection */
on = 0;
if ((fd = open("/dev/console", O_WRONLY)) == -1)
err(1, "open /dev/console");
if (ioctl(fd, TIOCCONS, &on) == -1)
err(1, "ioctl TIOCCONS");
close(fd);
/* then redirect console to our pseudo tty */
on = 1;
if (ioctl(sfd, TIOCCONS, &on) == -1)
err(1, "ioctl TIOCCONS on");
fprintf(lg, "console %s on %s\n", console, tty);
}
if (username) {
memset(&utmp, 0, sizeof(utmp));
strlcpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
strlcpy(utmp.ut_name, username, sizeof(utmp.ut_name));
time(&utmp.ut_time);
login(&utmp);
fprintf(lg, "login %s %s\n", username, tty);
}
}
void
restore(void)
{
int on;
if (tty == NULL)
return;
if (console) {
on = 0;
if (ioctl(sfd, TIOCCONS, &on) == -1)
err(1, "ioctl TIOCCONS off");
fprintf(lg, "console %s off\n", tty);
}
if (username) {
if (logout(tty) == 0)
errx(1, "logout %s", tty);
fprintf(lg, "logout %s\n", tty);
}
}
void
timeout(int sig)
{
fprintf(lg, "signal timeout %d\n", sig);
restore();
errx(3, "timeout");
}
void
terminate(int sig)
{
fprintf(lg, "signal terminate %d\n", sig);
restore();
errx(3, "terminate");
}
void
iostdin(int sig)
{
char buf[8192];
ssize_t n;
fprintf(lg, "signal iostdin %d\n", sig);
if ((n = read(0, buf, sizeof(buf))) < 0)
err(1, "read stdin");
restore();
if (n > 0)
errx(3, "read stdin %zd bytes", n);
exit(0);
}
|
