[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/sysklogd/klogd.c b/ap/app/busybox/src/sysklogd/klogd.c
new file mode 100644
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+++ b/ap/app/busybox/src/sysklogd/klogd.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini klogd implementation for busybox
+ *
+ * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
+ * Changes: Made this a standalone busybox module which uses standalone
+ * syslog() client interface.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
+ *
+ * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
+ *
+ * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//usage:#define klogd_trivial_usage
+//usage: "[-c N] [-n]"
+//usage:#define klogd_full_usage "\n\n"
+//usage: "Kernel logger\n"
+//usage: "\n -c N Print to console messages more urgent than prio N (1-8)"
+//usage: "\n -n Run in foreground"
+
+#include "libbb.h"
+#include <syslog.h>
+
+
+/* The Linux-specific klogctl(3) interface does not rely on the filesystem and
+ * allows us to change the console loglevel. Alternatively, we read the
+ * messages from _PATH_KLOG. */
+
+#if ENABLE_FEATURE_KLOGD_KLOGCTL
+
+# include <sys/klog.h>
+
+static void klogd_open(void)
+{
+ /* "Open the log. Currently a NOP" */
+ klogctl(1, NULL, 0);
+}
+
+static void klogd_setloglevel(int lvl)
+{
+ /* "printk() prints a message on the console only if it has a loglevel
+ * less than console_loglevel". Here we set console_loglevel = lvl. */
+ klogctl(8, NULL, lvl);
+}
+
+static int klogd_read(char *bufp, int len)
+{
+ return klogctl(2, bufp, len);
+}
+# define READ_ERROR "klogctl(2) error"
+
+static void klogd_close(void)
+{
+ /* FYI: cmd 7 is equivalent to setting console_loglevel to 7
+ * via klogctl(8, NULL, 7). */
+ klogctl(7, NULL, 0); /* "7 -- Enable printk's to console" */
+ klogctl(0, NULL, 0); /* "0 -- Close the log. Currently a NOP" */
+}
+
+#else
+
+# include <paths.h>
+# ifndef _PATH_KLOG
+# ifdef __GNU__
+# define _PATH_KLOG "/dev/klog"
+# else
+# error "your system's _PATH_KLOG is unknown"
+# endif
+# endif
+# define PATH_PRINTK "/proc/sys/kernel/printk"
+
+enum { klogfd = 3 };
+
+static void klogd_open(void)
+{
+ int fd = xopen(_PATH_KLOG, O_RDONLY);
+ xmove_fd(fd, klogfd);
+}
+
+static void klogd_setloglevel(int lvl)
+{
+ FILE *fp = fopen_or_warn(PATH_PRINTK, "w");
+ if (fp) {
+ /* This changes only first value:
+ * "messages with a higher priority than this
+ * [that is, with numerically lower value]
+ * will be printed to the console".
+ * The other three values in this pseudo-file aren't changed.
+ */
+ fprintf(fp, "%u\n", lvl);
+ fclose(fp);
+ }
+}
+
+static int klogd_read(char *bufp, int len)
+{
+ return read(klogfd, bufp, len);
+}
+# define READ_ERROR "read error"
+
+static void klogd_close(void)
+{
+ klogd_setloglevel(7);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(klogfd);
+}
+
+#endif
+
+#define log_buffer bb_common_bufsiz1
+enum {
+ KLOGD_LOGBUF_SIZE = sizeof(log_buffer),
+ OPT_LEVEL = (1 << 0),
+ OPT_FOREGROUND = (1 << 1),
+};
+
+/* TODO: glibc openlog(LOG_KERN) reverts to LOG_USER instead,
+ * because that's how they interpret word "default"
+ * in the openlog() manpage:
+ * LOG_USER (default)
+ * generic user-level messages
+ * and the fact that LOG_KERN is a constant 0.
+ * glibc interprets it as "0 in openlog() call means 'use default'".
+ * I think it means "if openlog wasn't called before syslog() is called,
+ * use default".
+ * Convincing glibc maintainers otherwise is, as usual, nearly impossible.
+ * Should we open-code syslog() here to use correct facility?
+ */
+
+int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int klogd_main(int argc UNUSED_PARAM, char **argv)
+{
+ int i = 0;
+ char *opt_c;
+ int opt;
+ int used;
+
+ opt = getopt32(argv, "c:n", &opt_c);
+ if (opt & OPT_LEVEL) {
+ /* Valid levels are between 1 and 8 */
+ i = xatou_range(opt_c, 1, 8);
+ }
+ if (!(opt & OPT_FOREGROUND)) {
+ bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
+ }
+
+ logmode = LOGMODE_SYSLOG;
+
+ /* klogd_open() before openlog(), since it might use fixed fd 3,
+ * and openlog() also may use the same fd 3 if we swap them:
+ */
+ klogd_open();
+ openlog("kernel", 0, LOG_KERN);
+ /*
+ * glibc problem: for some reason, glibc changes LOG_KERN to LOG_USER
+ * above. The logic behind this is that standard
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/syslog.html
+ * says the following about openlog and syslog:
+ * "LOG_USER
+ * Messages generated by arbitrary processes.
+ * This is the default facility identifier if none is specified."
+ *
+ * I believe glibc misinterpreted this text as "if openlog's
+ * third parameter is 0 (=LOG_KERN), treat it as LOG_USER".
+ * Whereas it was meant to say "if *syslog* is called with facility
+ * 0 in its 1st parameter without prior call to openlog, then perform
+ * implicit openlog(LOG_USER)".
+ *
+ * As a result of this, eh, feature, standard klogd was forced
+ * to open-code its own openlog and syslog implementation (!).
+ *
+ * Note that prohibiting openlog(LOG_KERN) on libc level does not
+ * add any security: any process can open a socket to "/dev/log"
+ * and write a string "<0>Voila, a LOG_KERN + LOG_EMERG message"
+ *
+ * Google code search tells me there is no widespread use of
+ * openlog("foo", 0, 0), thus fixing glibc won't break userspace.
+ *
+ * The bug against glibc was filed:
+ * bugzilla.redhat.com/show_bug.cgi?id=547000
+ */
+
+ if (i)
+ klogd_setloglevel(i);
+
+ signal(SIGHUP, SIG_IGN);
+ /* We want klogd_read to not be restarted, thus _norestart: */
+ bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
+
+ syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
+
+ write_pidfile(CONFIG_PID_FILE_PATH "/klogd.pid");
+
+ used = 0;
+ while (!bb_got_signal) {
+ int n;
+ int priority;
+ char *start;
+
+ /* "2 -- Read from the log." */
+ start = log_buffer + used;
+ n = klogd_read(start, KLOGD_LOGBUF_SIZE-1 - used);
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ bb_perror_msg(READ_ERROR);
+ break;
+ }
+ start[n] = '\0';
+
+ /* Process each newline-terminated line in the buffer */
+ start = log_buffer;
+ while (1) {
+ char *newline = strchrnul(start, '\n');
+
+ if (*newline == '\0') {
+ /* This line is incomplete */
+
+ /* move it to the front of the buffer */
+ overlapping_strcpy(log_buffer, start);
+ used = newline - start;
+ if (used < KLOGD_LOGBUF_SIZE-1) {
+ /* buffer isn't full */
+ break;
+ }
+ /* buffer is full, log it anyway */
+ used = 0;
+ newline = NULL;
+ } else {
+ *newline++ = '\0';
+ }
+
+ /* Extract the priority */
+ priority = LOG_INFO;
+ if (*start == '<') {
+ start++;
+ if (*start)
+ priority = strtoul(start, &start, 10);
+ if (*start == '>')
+ start++;
+ }
+ /* Log (only non-empty lines) */
+ if (*start)
+ syslog(priority, "%s", start);
+
+ if (!newline)
+ break;
+ start = newline;
+ }
+ }
+
+ klogd_close();
+ syslog(LOG_NOTICE, "klogd: exiting");
+ remove_pidfile(CONFIG_PID_FILE_PATH "/klogd.pid");
+ if (bb_got_signal)
+ kill_myself_with_sig(bb_got_signal);
+ return EXIT_FAILURE;
+}