2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
17 #include <sys/types.h>
18 #include <sys/socket.h>
29 #include <libubox/uloop.h>
30 #include <libubox/usock.h>
31 #include <libubox/ustream.h>
36 #define LOG_DEFAULT_SIZE (16 * 1024)
37 #define LOG_DEFAULT_SOCKET "/dev/log"
38 #define LOG_LINE_LEN 256
39 #define SYSLOG_PADDING 16
41 #define KLOG_DEFAULT_PROC "/proc/kmsg"
43 #define PAD(x) (x % 4) ? (((x) - (x % 4)) + 4) : (x)
45 static char *log_dev
= LOG_DEFAULT_SOCKET
;
46 static int log_size
= LOG_DEFAULT_SIZE
;
47 static struct log_head
*log
, *log_end
, *oldest
, *newest
;
48 static int current_id
= 0;
52 static struct log_head
*log_next(struct log_head
*h
, int size
)
54 struct log_head
*n
= (struct log_head
*) &h
->data
[PAD(sizeof(struct log_head
) + size
)];
56 return (n
>= log_end
) ? (log
) : (n
);
59 void log_add(char *buf
, int size
, int source
)
61 regmatch_t matches
[4];
62 struct log_head
*next
;
66 /* strip trailing newline */
67 if (buf
[size
- 2] == '\n') {
72 /* strip the priority */
73 ret
= regexec(&pat_prio
, buf
, 3, matches
, 0);
75 priority
= atoi(&buf
[matches
[1].rm_so
]);
76 size
-= matches
[2].rm_so
;
77 buf
+= matches
[2].rm_so
;
81 /* strip kernel timestamp */
82 ret
= regexec(&pat_tstamp
,buf
, 4, matches
, 0);
83 if ((source
== SOURCE_KLOG
) && !ret
) {
84 size
-= matches
[3].rm_so
;
85 buf
+= matches
[3].rm_so
;
89 /* strip syslog timestamp */
90 if ((source
== SOURCE_SYSLOG
) && (size
> SYSLOG_PADDING
) && (buf
[SYSLOG_PADDING
- 1] == ' ')) {
91 size
-= SYSLOG_PADDING
;
92 buf
+= SYSLOG_PADDING
;
95 DEBUG(2, "-> %d - %s\n", priority
, buf
);
97 /* find new oldest entry */
98 next
= log_next(newest
, size
);
100 while ((oldest
> newest
) && (oldest
<= next
) && (oldest
!= log
))
101 oldest
= log_next(oldest
, oldest
->size
);
103 DEBUG(2, "Log wrap\n");
105 next
= log_next(log
, size
);
106 for (oldest
= log
; oldest
<= next
; oldest
= log_next(oldest
, oldest
->size
))
111 /* add the log message */
113 newest
->id
= current_id
++;
114 newest
->priority
= priority
;
115 newest
->source
= source
;
116 clock_gettime(CLOCK_REALTIME
, &newest
->ts
);
117 strcpy(newest
->data
, buf
);
119 ubus_notify_log(newest
);
124 static void slog_cb(struct ustream
*s
, int bytes
)
126 struct ustream_buf
*buf
= s
->r
.head
;
131 str
= ustream_get_read_buf(s
, NULL
);
134 len
= strlen(buf
->data
);
137 ustream_consume(s
, 1);
140 log_add(buf
->data
, len
+ 1, SOURCE_SYSLOG
);
141 ustream_consume(s
, len
);
146 static void klog_cb(struct ustream
*s
, int bytes
)
148 struct ustream_buf
*buf
= s
->r
.head
;
153 str
= ustream_get_read_buf(s
, NULL
);
156 newline
= strchr(buf
->data
, '\n');
160 len
= newline
+ 1 - str
;
161 log_add(buf
->data
, len
, SOURCE_KLOG
);
162 ustream_consume(s
, len
);
166 struct ustream_fd slog
= {
167 .stream
.string_data
= true,
168 .stream
.notify_read
= slog_cb
,
171 struct ustream_fd klog
= {
172 .stream
.string_data
= true,
173 .stream
.notify_read
= klog_cb
,
176 static int klog_open(void)
180 DEBUG(1, "Opening %s\n", KLOG_DEFAULT_PROC
);
181 fd
= open(KLOG_DEFAULT_PROC
, O_RDONLY
| O_NONBLOCK
);
183 ERROR("Failed to open %s\n", KLOG_DEFAULT_PROC
);
186 fcntl(fd
, F_SETFD
, fcntl(fd
, F_GETFD
) | FD_CLOEXEC
);
187 ustream_fd_init(&klog
, fd
);
191 static int syslog_open(void)
195 DEBUG(1, "Opening %s\n", log_dev
);
197 fd
= usock(USOCK_UNIX
| USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
, log_dev
, NULL
);
199 ERROR("Failed to open %s\n", log_dev
);
202 chmod(log_dev
, 0666);
203 ustream_fd_init(&slog
, fd
);
207 struct log_head
* log_list(int count
, struct log_head
*h
)
209 unsigned int min
= count
;
212 min
= (count
< current_id
) ? (current_id
- count
) : (0);
213 if (!h
&& oldest
->id
>= min
)
218 while (h
!= newest
) {
219 h
= log_next(h
, h
->size
);
220 if (!h
->size
&& (h
> newest
))
222 if (h
->id
>= min
&& (h
!= newest
))
229 int log_buffer_init(int size
)
231 struct log_head
*_log
= malloc(size
);
234 ERROR("Failed to initialize log buffer with size %d\n", log_size
);
238 memset(_log
, 0, size
);
240 if (log
&& ((log_size
+ sizeof(struct log_head
)) < size
)) {
241 struct log_head
*start
= _log
;
242 struct log_head
*end
= ((void*) _log
) + size
;
245 l
= log_list(0, NULL
);
246 while ((start
< end
) && l
&& l
->size
) {
247 memcpy(start
, l
, PAD(sizeof(struct log_head
) + l
->size
));
248 start
= (struct log_head
*) &l
->data
[PAD(l
->size
)];
255 log_end
= ((void*) log
) + size
;
257 oldest
= newest
= log
= _log
;
258 log_end
= ((void*) log
) + size
;
265 int log_buffer_size(void)
272 regcomp(&pat_prio
, "^<([0-9]*)>(.*)", REG_EXTENDED
);
273 regcomp(&pat_tstamp
, "^\[[ 0]*([0-9]*).([0-9]*)] (.*)", REG_EXTENDED
);
275 if (log_buffer_init(log_size
)) {
276 ERROR("Failed to allocate log memory\n");
282 openlog("procd", LOG_PID
, LOG_DAEMON
);