--- /dev/null
+/*
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/un.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <fcntl.h>
+#include <regex.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <syslog.h>
+
+#include <libubox/uloop.h>
+#include <libubox/usock.h>
+#include <libubox/ustream.h>
+
+#include "syslog.h"
+
+#define LOG_DEFAULT_SIZE (16 * 1024)
+#define LOG_DEFAULT_SOCKET "/dev/log"
+#define LOG_LINE_LEN 256
+#define SYSLOG_PADDING 16
+
+#define KLOG_DEFAULT_PROC "/proc/kmsg"
+
+#define PAD(x) (x % 4) ? (((x) - (x % 4)) + 4) : (x)
+
+static char *log_dev = LOG_DEFAULT_SOCKET;
+static int log_size = LOG_DEFAULT_SIZE;
+static struct log_head *log, *log_end, *oldest, *newest;
+static int current_id = 0;
+static regex_t pat_prio;
+static regex_t pat_tstamp;
+
+static struct log_head*
+log_next(struct log_head *h, int size)
+{
+ struct log_head *n = (struct log_head *) &h->data[PAD(sizeof(struct log_head) + size)];
+
+ return (n >= log_end) ? (log) : (n);
+}
+
+void
+log_add(char *buf, int size, int source)
+{
+ regmatch_t matches[4];
+ struct log_head *next;
+ int priority = 0;
+ int ret;
+
+ /* bounce out if we don't have init'ed yet (regmatch etc will blow) */
+ if (!log) {
+ fprintf(stderr, buf);
+ return;
+ }
+
+ /* strip trailing newline */
+ if (buf[size - 2] == '\n') {
+ buf[size - 2] = '\0';
+ size -= 1;
+ }
+
+ /* strip the priority */
+ ret = regexec(&pat_prio, buf, 3, matches, 0);
+ if (!ret) {
+ priority = atoi(&buf[matches[1].rm_so]);
+ size -= matches[2].rm_so;
+ buf += matches[2].rm_so;
+ }
+
+#if 0
+ /* strip kernel timestamp */
+ ret = regexec(&pat_tstamp,buf, 4, matches, 0);
+ if ((source == SOURCE_KLOG) && !ret) {
+ size -= matches[3].rm_so;
+ buf += matches[3].rm_so;
+ }
+#endif
+
+ /* strip syslog timestamp */
+ if ((source == SOURCE_SYSLOG) && (size > SYSLOG_PADDING) && (buf[SYSLOG_PADDING - 1] == ' ')) {
+ size -= SYSLOG_PADDING;
+ buf += SYSLOG_PADDING;
+ }
+
+ //fprintf(stderr, "-> %d - %s\n", priority, buf);
+
+ /* find new oldest entry */
+ next = log_next(newest, size);
+ if (next > newest) {
+ while ((oldest > newest) && (oldest <= next) && (oldest != log))
+ oldest = log_next(oldest, oldest->size);
+ } else {
+ //fprintf(stderr, "Log wrap\n");
+ newest->size = 0;
+ next = log_next(log, size);
+ for (oldest = log; oldest <= next; oldest = log_next(oldest, oldest->size))
+ ;
+ newest = log;
+ }
+
+ /* add the log message */
+ newest->size = size;
+ newest->id = current_id++;
+ newest->priority = priority;
+ newest->source = source;
+ clock_gettime(CLOCK_REALTIME, &newest->ts);
+ strcpy(newest->data, buf);
+
+ ubus_notify_log(newest);
+
+ newest = next;
+}
+
+static void
+slog_cb(struct ustream *s, int bytes)
+{
+ struct ustream_buf *buf = s->r.head;
+ char *str;
+ int len;
+
+ do {
+ str = ustream_get_read_buf(s, NULL);
+ if (!str)
+ break;
+ len = strlen(buf->data);
+ if (!len) {
+ bytes -= 1;
+ ustream_consume(s, 1);
+ continue;
+ }
+ log_add(buf->data, len + 1, SOURCE_SYSLOG);
+ ustream_consume(s, len);
+ bytes -= len;
+ } while (bytes > 0);
+}
+
+static void
+klog_cb(struct ustream *s, int bytes)
+{
+ struct ustream_buf *buf = s->r.head;
+ char *newline, *str;
+ int len;
+
+ do {
+ str = ustream_get_read_buf(s, NULL);
+ if (!str)
+ break;
+ newline = strchr(buf->data, '\n');
+ if (!newline)
+ break;
+ *newline = 0;
+ len = newline + 1 - str;
+ log_add(buf->data, len, SOURCE_KLOG);
+ ustream_consume(s, len);
+ } while (1);
+}
+
+struct ustream_fd slog = {
+ .stream.string_data = true,
+ .stream.notify_read = slog_cb,
+};
+
+struct ustream_fd klog = {
+ .stream.string_data = true,
+ .stream.notify_read = klog_cb,
+};
+
+static int
+klog_open(void)
+{
+ int fd;
+
+ fd = open(KLOG_DEFAULT_PROC, O_RDONLY | O_NONBLOCK);
+ if (fd < 0) {
+ fprintf(stderr, "Failed to open %s\n", KLOG_DEFAULT_PROC);
+ return -1;
+ }
+ fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
+ ustream_fd_init(&klog, fd);
+ return 0;
+}
+
+static int
+syslog_open(void)
+{
+ int fd;
+
+ unlink(log_dev);
+ fd = usock(USOCK_UNIX | USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK, log_dev, NULL);
+ if (fd < 0) {
+ fprintf(stderr,"Failed to open %s\n", log_dev);
+ return -1;
+ }
+ chmod(log_dev, 0666);
+ ustream_fd_init(&slog, fd);
+ return 0;
+}
+
+struct log_head*
+log_list(int count, struct log_head *h)
+{
+ unsigned int min = count;
+
+ if (count)
+ min = (count < current_id) ? (current_id - count) : (0);
+ if (!h && oldest->id >= min)
+ return oldest;
+ if (!h)
+ h = oldest;
+
+ while (h != newest) {
+ h = log_next(h, h->size);
+ if (!h->size && (h > newest))
+ h = log;
+ if (h->id >= min && (h != newest))
+ return h;
+ }
+
+ return NULL;
+}
+
+int
+log_buffer_init(int size)
+{
+ struct log_head *_log = malloc(size);
+
+ if (!_log) {
+ fprintf(stderr, "Failed to initialize log buffer with size %d\n", log_size);
+ return -1;
+ }
+
+ memset(_log, 0, size);
+
+ if (log && ((log_size + sizeof(struct log_head)) < size)) {
+ struct log_head *start = _log;
+ struct log_head *end = ((void*) _log) + size;
+ struct log_head *l;
+
+ l = log_list(0, NULL);
+ while ((start < end) && l && l->size) {
+ memcpy(start, l, PAD(sizeof(struct log_head) + l->size));
+ start = (struct log_head *) &l->data[PAD(l->size)];
+ l = log_list(0, l);
+ }
+ free(log);
+ newest = start;
+ newest->size = 0;
+ oldest = log = _log;
+ log_end = ((void*) log) + size;
+ } else {
+ oldest = newest = log = _log;
+ log_end = ((void*) log) + size;
+ }
+ log_size = size;
+
+ return 0;
+}
+
+void
+log_init(void)
+{
+ regcomp(&pat_prio, "^<([0-9]*)>(.*)", REG_EXTENDED);
+ regcomp(&pat_tstamp, "^\[[ 0]*([0-9]*).([0-9]*)] (.*)", REG_EXTENDED);
+
+ if (log_buffer_init(log_size)) {
+ fprintf(stderr, "Failed to allocate log memory\n");
+ exit(-1);
+ }
+
+ syslog_open();
+ klog_open();
+ openlog("sysinit", LOG_CONS, LOG_DAEMON);
+}
+
+void
+log_shutdown(void)
+{
+ ustream_free(&slog.stream);
+ ustream_free(&klog.stream);
+ close(slog.fd.fd);
+ close(klog.fd.fd);
+}
projects / project / ubox.git / blobdiff