lib: preparations for RFC5424 syslog support

doc/user/basic.rst

@@ -174,11 +174,17 @@ Basic Config Commands
    is used to start the daemon then this command is turned on by default
    and cannot be turned off and the [no] form of the command is dissallowed.
 
-.. clicmd:: log-filter WORD [DAEMON]
+.. clicmd:: log filtered-file [FILENAME [LEVEL]]
+
+   Configure a destination file for filtered logs with the
+   :clicmd:`log filter-text WORD` command.
+
+.. clicmd:: log filter-text WORD
 
    This command forces logs to be filtered on a specific string. A log message
    will only be printed if it matches on one of the filters in the log-filter
-   table. Can be daemon independent.
+   table.  The filter only applies to file logging targets configured with
+   :clicmd:`log filtered-file [FILENAME [LEVEL]]`.
 
    .. note::
 
@@ -187,10 +193,15 @@ Basic Config Commands
       Log filters prevent this but you should still expect a small performance
       hit due to filtering each of all those logs.
 
-.. clicmd:: log-filter clear [DAEMON]
+   .. note::
+
+      This setting is not saved to ``frr.conf`` and not shown in
+      :clicmd:`show running-config`.  It is intended for ephemeral debugging
+      purposes only.
+
+.. clicmd:: clear log filter-text
 
-   This command clears all current filters in the log-filter table. Can be
-   daemon independent.
+   This command clears all current filters in the log-filter table.
 
 
 .. clicmd:: log immediate-mode

lib/compiler.h

@@ -356,7 +356,11 @@ extern "C" {
 #define PRIx64 "Lx"
 
 #else /* !_FRR_ATTRIBUTE_PRINTFRR */
+#ifdef __NetBSD__
+#define PRINTFRR(a, b) __attribute__((format(gnu_syslog, a, b)))
+#else
 #define PRINTFRR(a, b) __attribute__((format(printf, a, b)))
+#endif
 
 /* frr-format plugin is C-only for now, so no point in doing these shenanigans
  * for C++...  (also they can break some C++ stuff...)

lib/log_filter.c

@@ -111,13 +111,14 @@ int zlog_filter_dump(char *buf, size_t max_size)
 	return len;
 }
 
-static int search_buf(const char *buf)
+static int search_buf(const char *buf, size_t len)
 {
 	char *found = NULL;
 
 	frr_with_mutex(&logfilterlock) {
 		for (int i = 0; i < zlog_filter_count; i++) {
-			found = strstr(buf, zlog_filters[i]);
+			found = memmem(buf, len, zlog_filters[i],
+				       strlen(zlog_filters[i]));
 			if (found != NULL)
 				return 0;
 		}
@@ -131,12 +132,15 @@ static void zlog_filterfile_fd(struct zlog_target *zt, struct zlog_msg *msgs[],
 {
 	struct zlog_msg *msgfilt[nmsgs];
 	size_t i, o = 0;
+	const char *text;
+	size_t text_len;
 
 	for (i = 0; i < nmsgs; i++) {
-		if (zlog_msg_prio(msgs[i]) >= LOG_DEBUG
-		    && search_buf(zlog_msg_text(msgs[i], NULL)) < 0)
-			continue;
-
+		if (zlog_msg_prio(msgs[i]) >= LOG_DEBUG) {
+			text = zlog_msg_text(msgs[i], &text_len);
+			if (search_buf(text, text_len) < 0)
+				continue;
+		}
 		msgfilt[o++] = msgs[i];
 	}
 

lib/log_vty.c

@@ -34,6 +34,7 @@
 #define ZLOG_MAXLVL(a, b) MAX(a, b)
 
 DEFINE_HOOK(zlog_rotate, (), ());
+DEFINE_HOOK(zlog_cli_show, (struct vty * vty), (vty));
 
 static const int log_default_lvl = LOG_DEBUG;
 
@@ -57,7 +58,7 @@ static struct zlog_cfg_filterfile zt_filterfile = {
 	},
 };
 
-static const char *zlog_progname;
+const char *zlog_progname;
 static const char *zlog_protoname;
 
 static const struct facility_map {
@@ -94,7 +95,14 @@ static const char * const zlog_priority[] = {
 	"notifications", "informational", "debugging", NULL,
 };
 
-static const char *facility_name(int facility)
+const char *zlog_priority_str(int priority)
+{
+	if (priority > LOG_DEBUG)
+		return "???";
+	return zlog_priority[priority];
+}
+
+const char *facility_name(int facility)
 {
 	const struct facility_map *fm;
 
@@ -104,7 +112,7 @@ static const char *facility_name(int facility)
 	return "";
 }
 
-static int facility_match(const char *str)
+int facility_match(const char *str)
 {
 	const struct facility_map *fm;
 
@@ -194,6 +202,8 @@ DEFUN_NOSH (show_logging,
 	vty_out(vty, "Record priority: %s\n",
 		(zt_file.record_priority ? "enabled" : "disabled"));
 	vty_out(vty, "Timestamp precision: %d\n", zt_file.ts_subsec);
+
+	hook_call(zlog_cli_show, vty);
 	return CMD_SUCCESS;
 }
 
@@ -588,8 +598,9 @@ DEFUN (no_config_log_filterfile,
 
 DEFPY (log_filter,
        log_filter_cmd,
-       "[no] log-filter WORD$filter",
+       "[no] log filter-text WORD$filter",
        NO_STR
+       "Logging control\n"
        FILTER_LOG_STR
        "String to filter by\n")
 {
@@ -616,8 +627,9 @@ DEFPY (log_filter,
 /* Clear all log filters */
 DEFPY (log_filter_clear,
        log_filter_clear_cmd,
-       "clear log-filter",
+       "clear log filter-text",
        CLEAR_STR
+       "Logging control\n"
        FILTER_LOG_STR)
 {
 	zlog_filter_clear();
@@ -627,8 +639,9 @@ DEFPY (log_filter_clear,
 /* Show log filter */
 DEFPY (show_log_filter,
        show_log_filter_cmd,
-       "show log-filter",
+       "show logging filter-text",
        SHOW_STR
+       "Show current logging configuration\n"
        FILTER_LOG_STR)
 {
 	char log_filters[ZLOG_FILTERS_MAX * (ZLOG_FILTER_LENGTH_MAX + 3)] = "";

lib/log_vty.h

@@ -34,9 +34,14 @@ extern void log_config_write(struct vty *vty);
 extern int log_level_match(const char *s);
 extern void log_show_syslog(struct vty *vty);
 
+extern int facility_match(const char *str);
+extern const char *facility_name(int facility);
+
 DECLARE_HOOK(zlog_rotate, (), ());
 extern void zlog_rotate(void);
 
+DECLARE_HOOK(zlog_cli_show, (struct vty * vty), (vty));
+
 #ifdef __cplusplus
 }
 #endif