support warning and critical environment variables

Like the mainline plugins do.

tools/munin-plugins-busybox/common.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+extern char **environ;
 
 int writeyes(void) {
 	puts("yes");
@@ -21,3 +25,42 @@ int getenvint(const char *name, int defvalue) {
 		return defvalue;
 	return atoi(value);
 }
+
+const char *getenv_composed(const char *name1, const char *name2) {
+	char **p;
+	size_t len1 = strlen(name1), len2 = strlen(name2);
+	for(p = environ; *p; ++p) {
+		if(0 == strncmp(*p, name1, len1) &&
+				0 == strncmp(len1 + *p, name2, len2) &&
+				(*p)[len1 + len2] == '=')
+			return len1 + len2 + 1 + *p;
+	}
+	return NULL;
+}
+
+void print_warning(const char *name) {
+	const char *p;
+	p = getenv_composed(name, "_warning");
+	if(p == NULL)
+		p = getenv("warning");
+	if(p == NULL)
+		return;
+
+	printf("%s.warning %s\n", name, p);
+}
+
+void print_critical(const char *name) {
+	const char *p;
+	p = getenv_composed(name, "_critical");
+	if(p == NULL)
+		p = getenv("critical");
+	if(p == NULL)
+		return;
+
+	printf("%s.critial %s\n", name, p);
+}
+
+void print_warncrit(const char *name) {
+	print_warning(name);
+	print_critical(name);
+}

tools/munin-plugins-busybox/common.h

@@ -6,5 +6,9 @@
 int writeyes(void);
 int writeno(const char *);
 int getenvint(const char *, int);
+const char *getenv_composed(const char *, const char *);
+void print_warning(const char *);
+void print_critical(const char *);
+void print_warncrit(const char *);
 
 #endif

tools/munin-plugins-busybox/entropy.c

@@ -17,6 +17,7 @@ int entropy(int argc, char **argv) {
 				"graph_info This graph shows the amount of entropy available in the system.\n"
 				"entropy.label entropy\n"
 				"entropy.info The number of random bytes available. This is typically used by cryptographic applications.");
+			print_warncrit("entropy");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf"))

tools/munin-plugins-busybox/forks.c

@@ -18,6 +18,7 @@ int forks(int argc, char **argv) {
 				"forks.min 0\n"
 				"forks.max 100000\n"
 				"forks.info The number of forks per second.");
+			print_warncrit("forks");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {

tools/munin-plugins-busybox/if_err_.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include "common.h"
 
 #define PROC_NET_DEV "/proc/net/dev"
 
@@ -74,6 +75,8 @@ int if_err_(int argc, char **argv) {
 				"trans.type COUNTER\n"
 				"trans.negative rcvd\n"
 				"trans.warning 1");
+			print_warncrit("rcvd");
+			print_warncrit("trans");
 			return 0;
 		}
 	}

tools/munin-plugins-busybox/interrupts.c

@@ -23,6 +23,8 @@ int interrupts(int argc, char **argv) {
 				"ctx.max 100000\n"
 				"intr.min 0\n"
 				"ctx.min 0");
+			print_warncrit("intr");
+			print_warncrit("ctx");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {

tools/munin-plugins-busybox/load.c

@@ -16,9 +16,7 @@ int load(int argc, char **argv) {
 				"graph_scale no\n"
 				"graph_category system\n"
 				"load.label load");
-			printf("load.warning %d\nload.critical %d\n",
-					getenvint("load_warn", 10),
-					getenvint("load_crit", 120));
+			print_warncrit("load");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf"))

tools/munin-plugins-busybox/open_inodes.c

@@ -19,7 +19,8 @@ int open_inodes(int argc, char **argv) {
 				"used.info The number of currently open inodes.\n"
 				"max.label inode table size\n"
 				"max.info The size of the system inode table. This is dynamically adjusted by the kernel.");
-
+			print_warncrit("used");
+			print_warncrit("max");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {

tools/munin-plugins-busybox/swap.c

@@ -23,7 +23,8 @@ int swap(int argc, char **argv) {
 				"swap_out.max 100000\n"
 				"swap_out.min 0\n"
 				"swap_out.negative swap_in");
-
+			print_warncrit("swap_in");
+			print_warncrit("swap_out");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {

tools/munin-plugins-busybox/uptime.c

@@ -12,6 +12,7 @@ int uptime(int argc, char **argv) {
 				"graph_vlabel uptime in days\n"
 				"uptime.label uptime\n"
 				"uptime.draw AREA");
+			print_warncrit("uptime");
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf"))