From: Guus Sliepen <guus@tinc-vpn.org>
Date: Mon, 6 Jun 2011 14:26:11 +0000 (+0200)
Subject: Improved --logfile option.
X-Git-Tag: release-1.0.15~2
X-Git-Url: https://tinc-vpn.org/git/browse?a=commitdiff_plain;h=4b3fd94b1cc79c24c4092b6b10ed4627a2648d26;p=tinc

Improved --logfile option.

Instead of UNIX time, the log messages now start with the time in RFC3339
format, which human-readable and still easy for the computer to parse and sort.
The HUP signal will also cause the log file to be closed and reopened, which is
useful when log rotation is used. If there is an error while opening the log
file, this is logged to stderr.
---

diff --git a/configure.in b/configure.in
index 45db5471..1421b16a 100644
--- a/configure.in
+++ b/configure.in
@@ -101,7 +101,7 @@ dnl Checks for header files.
 dnl We do this in multiple stages, because unlike Linux all the other operating systems really suck and don't include their own dependencies.
 
 AC_HEADER_STDC
-AC_CHECK_HEADERS([stdbool.h syslog.h sys/file.h sys/ioctl.h sys/mman.h sys/param.h sys/resource.h sys/socket.h sys/time.h sys/uio.h sys/wait.h netdb.h arpa/inet.h dirent.h])
+AC_CHECK_HEADERS([stdbool.h syslog.h sys/file.h sys/ioctl.h sys/mman.h sys/param.h sys/resource.h sys/socket.h sys/time.h time.h sys/uio.h sys/wait.h netdb.h arpa/inet.h dirent.h])
 AC_CHECK_HEADERS([net/if.h net/if_types.h linux/if_tun.h net/if_tun.h net/tun/if_tun.h net/if_tap.h net/tap/if_tap.h net/ethernet.h net/if_arp.h netinet/in_systm.h netinet/in.h netinet/in6.h],
   [], [], [#include "have.h"]
 )
diff --git a/doc/tinc.texi b/doc/tinc.texi
index 6bbc2e24..52a0eccf 100644
--- a/doc/tinc.texi
+++ b/doc/tinc.texi
@@ -1638,6 +1638,8 @@ it defaults to the maximum time of 15 minutes.
 Partially rereads configuration files.
 Connections to hosts whose host config file are removed are closed.
 New outgoing connections specified in @file{tinc.conf} will be made.
+If the --logfile option is used, this will also close and reopen the log file,
+useful when log rotation is used.
 
 @item INT
 Temporarily increases debug level to 5.
diff --git a/doc/tincd.8.in b/doc/tincd.8.in
index a8ef2fb8..5ea08c01 100644
--- a/doc/tincd.8.in
+++ b/doc/tincd.8.in
@@ -130,6 +130,10 @@ Connections to hosts whose host config file are removed are closed.
 New outgoing connections specified in
 .Pa tinc.conf
 will be made.
+If the
+.Fl -logfile
+option is used, this will also close and reopen the log file,
+useful when log rotation is used.
 .It INT
 Temporarily increases debug level to 5.
 Send this signal again to revert to the original level.
diff --git a/have.h b/have.h
index 073fbaa3..72af0698 100644
--- a/have.h
+++ b/have.h
@@ -71,6 +71,10 @@
 #include <sys/time.h>
 #endif
 
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
diff --git a/src/logger.c b/src/logger.c
index bc20438c..f886ba4c 100644
--- a/src/logger.c
+++ b/src/logger.c
@@ -44,14 +44,18 @@ void openlogger(const char *ident, logmode_t mode) {
 		case LOGMODE_FILE:
 			logpid = getpid();
 			logfile = fopen(logfilename, "a");
-			if(!logfile)
+			if(!logfile) {
+				fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 				logmode = LOGMODE_NULL;
+			}
 			break;
 		case LOGMODE_SYSLOG:
 #ifdef HAVE_MINGW
 			loghandle = RegisterEventSource(NULL, logident);
-			if(!loghandle)
+			if(!loghandle) {
+				fprintf(stderr, "Could not open log handle!");
 				logmode = LOGMODE_NULL;
+			}
 			break;
 #else
 #ifdef HAVE_SYSLOG_H
@@ -64,8 +68,24 @@ void openlogger(const char *ident, logmode_t mode) {
 	}
 }
 
+void reopenlogger() {
+	if(logmode != LOGMODE_FILE)
+		return;
+
+	fflush(logfile);
+	FILE *newfile = fopen(logfilename, "a");
+	if(!newfile) {
+		logger(LOG_ERR, "Unable to reopen log file %s: %s\n", logfilename, strerror(errno));
+		return;
+	}
+	fclose(logfile);
+	logfile = newfile;
+}
+
 void logger(int priority, const char *format, ...) {
 	va_list ap;
+	char timestr[32] = "";
+	time_t now;
 
 	va_start(ap, format);
 
@@ -76,7 +96,9 @@ void logger(int priority, const char *format, ...) {
 			fflush(stderr);
 			break;
 		case LOGMODE_FILE:
-			fprintf(logfile, "%ld %s[%ld]: ", time(NULL), logident, (long)logpid);
+			now = time(NULL);
+			strftime(timestr, sizeof timestr, "%Y-%m-%d %H:%M:%S", localtime(&now));
+			fprintf(logfile, "%s %s[%ld]: ", timestr, logident, (long)logpid);
 			vfprintf(logfile, format, ap);
 			fprintf(logfile, "\n");
 			fflush(logfile);
diff --git a/src/logger.h b/src/logger.h
index 9c20eada..ff2cb345 100644
--- a/src/logger.h
+++ b/src/logger.h
@@ -47,6 +47,7 @@ enum {
 
 extern debug_t debug_level;
 extern void openlogger(const char *, logmode_t);
+extern void reopenlogger(void);
 extern void logger(int, const char *, ...) __attribute__ ((__format__(printf, 2, 3)));
 extern void closelogger(void);
 
diff --git a/src/net.c b/src/net.c
index c2f70220..c5193c5d 100644
--- a/src/net.c
+++ b/src/net.c
@@ -501,6 +501,8 @@ int main_loop(void) {
 			struct stat s;
 			
 			sighup = false;
+
+			reopenlogger();
 			
 			/* Reread our own configuration file */