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
228
229
230
231
232
233
234
235
|
/*
rc-logger.c
Spawns a logging daemon to capture stdout and stderr so we can log
them to a buffer and/or files.
Copyright 2007 Gentoo Foundation
Released under the GPLv2
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#ifdef __linux__
# include <pty.h>
#else
# include <libutil.h>
#endif
#include "einfo.h"
#include "rc-logger.h"
#include "rc-misc.h"
#include "rc.h"
#define LOGFILE RC_SVCDIR "/rc.log"
#define PERMLOG "/var/log/rc.log"
#define MOVELOG "mv " LOGFILE " " PERMLOG ".$$.tmp && cat " PERMLOG \
".$$.tmp >>" PERMLOG " 2>/dev/null && rm -f " PERMLOG ".$$.tmp"
static int signal_pipe[2] = { -1, -1 };
static int fd_stdout = -1;
static int fd_stderr = -1;
static const char *runlevel = NULL;
static bool in_escape = false;
static bool in_term = false;
static char *logbuf = NULL;
static size_t logbuf_size = 0;
static size_t logbuf_len = 0;
pid_t rc_logger_pid = -1;
int rc_logger_tty = -1;
bool rc_in_logger = false;
static void write_log (int logfd, const char *buffer, size_t bytes)
{
const char *p = buffer;
while ((size_t) (p - buffer) < bytes) {
switch (*p) {
case '\r':
goto cont;
case '\033':
in_escape = true;
in_term = false;
goto cont;
case '\n':
in_escape = in_term = false;
break;
case '[':
if (in_escape)
in_term = true;
break;
}
if (! in_escape) {
write (logfd, p++, 1);
continue;
}
if (! in_term || isalpha (*p))
in_escape = in_term = false;
cont:
p++;
}
}
static void write_time (FILE *f, const char *s)
{
time_t now = time (NULL);
struct tm *tm = localtime (&now);
fprintf (f, "\nrc %s logging %s at %s\n", runlevel, s, asctime (tm));
fflush (f);
}
void rc_logger_close ()
{
if (signal_pipe[1] > -1) {
int sig = SIGTERM;
write (signal_pipe[1], &sig, sizeof (sig));
close (signal_pipe[1]);
signal_pipe[1] = -1;
}
if (rc_logger_pid > 0)
waitpid (rc_logger_pid, 0, 0);
if (fd_stdout > -1)
dup2 (fd_stdout, STDOUT_FILENO);
if (fd_stderr > -1)
dup2 (fd_stderr, STDERR_FILENO);
}
void rc_logger_open (const char *level)
{
int slave_tty;
struct termios tt;
struct winsize ws;
char *buffer;
fd_set rset;
int s = 0;
size_t bytes;
int selfd;
int i;
FILE *log = NULL;
if (! isatty (STDOUT_FILENO))
return;
if (! rc_env_bool ("RC_LOGGER"))
return;
if (pipe (signal_pipe) == -1)
eerrorx ("pipe: %s", strerror (errno));
for (i = 0; i < 2; i++)
if ((s = fcntl (signal_pipe[i], F_GETFD, 0) == -1 ||
fcntl (signal_pipe[i], F_SETFD, s | FD_CLOEXEC) == -1))
eerrorx ("fcntl: %s", strerror (errno));
tcgetattr (STDOUT_FILENO, &tt);
ioctl (STDOUT_FILENO, TIOCGWINSZ, &ws);
/* /dev/pts may not be available yet */
if (openpty (&rc_logger_tty, &slave_tty, NULL, &tt, &ws))
return;
rc_logger_pid = fork ();
switch (rc_logger_pid) {
case -1:
eerror ("forkpty: %s", strerror (errno));
break;
case 0:
rc_in_logger = true;
close (signal_pipe[1]);
signal_pipe[1] = -1;
runlevel = level;
if ((log = fopen (LOGFILE, "a")))
write_time (log, "started");
else {
free (logbuf);
logbuf_size = RC_LINEBUFFER * 10;
logbuf = xmalloc (sizeof (char) * logbuf_size);
logbuf_len = 0;
}
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
selfd = rc_logger_tty > signal_pipe[0] ? rc_logger_tty : signal_pipe[0];
while (1) {
FD_ZERO (&rset);
FD_SET (rc_logger_tty, &rset);
FD_SET (signal_pipe[0], &rset);
if ((s = select (selfd + 1, &rset, NULL, NULL, NULL)) == -1) {
eerror ("select: %s", strerror (errno));
break;
}
if (s > 0) {
if (FD_ISSET (rc_logger_tty, &rset)) {
memset (buffer, 0, RC_LINEBUFFER);
bytes = read (rc_logger_tty, buffer, RC_LINEBUFFER);
write (STDOUT_FILENO, buffer, bytes);
if (log)
write_log (fileno (log), buffer, bytes);
else {
if (logbuf_size - logbuf_len < bytes) {
logbuf_size += RC_LINEBUFFER * 10;
logbuf = xrealloc (logbuf, sizeof (char ) *
logbuf_size);
}
memcpy (logbuf + logbuf_len, buffer, bytes);
logbuf_len += bytes;
}
}
/* Only SIGTERMS signals come down this pipe */
if (FD_ISSET (signal_pipe[0], &rset))
break;
}
}
free (buffer);
if (logbuf) {
if ((log = fopen (LOGFILE, "a"))) {
write_time (log, "started");
write_log (fileno (log), logbuf, logbuf_len);
}
free (logbuf);
}
if (log) {
write_time (log, "stopped");
fclose (log);
}
/* Try and cat our new logfile to a more permament location and then
* punt it */
system (MOVELOG);
exit (0);
default:
setpgid (rc_logger_pid, 0);
fd_stdout = dup (STDOUT_FILENO);
fd_stderr = dup (STDERR_FILENO);
dup2 (slave_tty, STDOUT_FILENO);
dup2 (slave_tty, STDERR_FILENO);
if (slave_tty != STDIN_FILENO &&
slave_tty != STDOUT_FILENO &&
slave_tty != STDERR_FILENO)
close (slave_tty);
close (signal_pipe[0]);
signal_pipe[0] = -1;
break;
}
}
|
