[PATCH v2] zcip: Add environment variable for overriding log functionality

Michel Stam m.stam at fugro.nl
Tue Nov 4 11:05:07 UTC 2014


Signed-off-by: Michel Stam <m.stam at fugro.nl>
---
 docs/logging_and_backgrounding.txt |  2 ++
 include/libbb.h                    |  1 +
 libbb/Kbuild.src                   |  3 +++
 libbb/logenv.c                     | 27 +++++++++++++++++++++++++++
 networking/zcip.c                  |  6 ++++++
 5 files changed, 39 insertions(+)
 create mode 100644 libbb/logenv.c

diff --git a/docs/logging_and_backgrounding.txt b/docs/logging_and_backgrounding.txt
index 7e68855..0609a14 100644
--- a/docs/logging_and_backgrounding.txt
+++ b/docs/logging_and_backgrounding.txt
@@ -45,6 +45,8 @@ udhcpc - auto-backgrounds unless -f after lease is obtained,
 udhcpd - auto-backgrounds and do not log to stderr unless -f,
     otherwise logs to stderr, but option -S makes it log *also* to syslog
 zcip - auto-backgrounds and logs *also* to syslog unless -f
+    behaviour can be overridden with experimental LOGGING env.var
+    (can be set to either none or syslog)
 
 Total: 13 applets (+1 obsolete),
  4 log to syslog by default (crond fakeidentd inetd zcip),
diff --git a/include/libbb.h b/include/libbb.h
index d57f00e..cc2bea3 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1104,6 +1104,7 @@ extern void bb_perror_nomsg_and_die(void) NORETURN FAST_FUNC;
 extern void bb_perror_nomsg(void) FAST_FUNC;
 extern void bb_info_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
 extern void bb_verror_msg(const char *s, va_list p, const char *strerr) FAST_FUNC;
+extern void bb_logenv_override(void) FAST_FUNC;
 
 /* We need to export XXX_main from libbusybox
  * only if we build "individual" binaries
diff --git a/libbb/Kbuild.src b/libbb/Kbuild.src
index 0a9e803..f204816 100644
--- a/libbb/Kbuild.src
+++ b/libbb/Kbuild.src
@@ -187,3 +187,6 @@ lib-$(CONFIG_PGREP) += xregcomp.o
 lib-$(CONFIG_PKILL) += xregcomp.o
 lib-$(CONFIG_DEVFSD) += xregcomp.o
 lib-$(CONFIG_FEATURE_FIND_REGEX) += xregcomp.o
+
+# Add the experimental logging functionality, only used by zcip
+lib-$(CONFIG_ZCIP) += logenv.o
diff --git a/libbb/logenv.c b/libbb/logenv.c
new file mode 100644
index 0000000..5b81749
--- /dev/null
+++ b/libbb/logenv.c
@@ -0,0 +1,27 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2014 by Fugro Intersite B.V. <m.stam at fugro.nl>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include <stdlib.h>
+#include <string.h>
+
+void FAST_FUNC bb_logenv_override(void)
+{
+	const char* mode = getenv("LOGGING");
+
+	if (mode == NULL)
+		return;
+
+	if (!strcmp(mode, "none"))
+		logmode = LOGMODE_NONE;
+# if ENABLE_FEATURE_SYSLOG
+	else if (!strcmp(mode, "syslog"))
+		logmode |= LOGMODE_SYSLOG;
+# endif
+}
diff --git a/networking/zcip.c b/networking/zcip.c
index 635d660..51ff588 100644
--- a/networking/zcip.c
+++ b/networking/zcip.c
@@ -35,6 +35,10 @@
 //usage:     "\n"
 //usage:     "\nWith no -q, runs continuously monitoring for ARP conflicts,"
 //usage:     "\nexits only on I/O errors (link down etc)"
+//usage:     "\n"
+//usage:     "\nUse the LOGGING environment variable to override default"
+//usage:     "\nlogging behaviour (none to disable logging, syslog to log"
+//usage:     "\nto syslog as well"
 
 #include "libbb.h"
 #include <netinet/ether.h>
@@ -249,6 +253,8 @@ int zcip_main(int argc UNUSED_PARAM, char **argv)
 		openlog(applet_name, 0, LOG_DAEMON);
 		logmode |= LOGMODE_SYSLOG;
 	}
+	bb_logenv_override( );
+
 	{ // -l n.n.n.n
 		struct in_addr net;
 		if (inet_aton(l_opt, &net) == 0
-- 
1.7.12.1



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