--- /dev/null
+/**
+ * collectd - src/target_replace.c
+ * Copyright (C) 2008 Florian Forster
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; only version 2 of the License is applicable.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors:
+ * Florian Forster <octo at verplant.org>
+ **/
+
+/*
+ * First tell the compiler to stick to the C99 and POSIX standards as close as
+ * possible.
+ */
+#ifndef __STRICT_ANSI__ /* {{{ */
+# define __STRICT_ANSI__
+#endif
+
+#ifndef _ISOC99_SOURCE
+# define _ISOC99_SOURCE
+#endif
+
+#ifdef _POSIX_C_SOURCE
+# undef _POSIX_C_SOURCE
+#endif
+#define _POSIX_C_SOURCE 200112L
+
+#if 0
+/* Single UNIX needed for strdup. */
+#ifdef _XOPEN_SOURCE
+# undef _XOPEN_SOURCE
+#endif
+#define _XOPEN_SOURCE 500
+#endif
+
+#ifndef _REENTRANT
+# define _REENTRANT
+#endif
+
+#ifndef _THREAD_SAFE
+# define _THREAD_SAFE
+#endif
+
+#ifdef _GNU_SOURCE
+# undef _GNU_SOURCE
+#endif
+/* }}} */
+
+#include "collectd.h"
+#include "common.h"
+#include "filter_chain.h"
+#include "utils_subst.h"
+
+#include <regex.h>
+
+struct tr_action_s;
+typedef struct tr_action_s tr_action_t;
+struct tr_action_s
+{
+ regex_t re;
+ char *replacement;
+ int may_be_empty;
+
+ tr_action_t *next;
+};
+
+struct tr_data_s
+{
+ tr_action_t *host;
+ tr_action_t *plugin;
+ tr_action_t *plugin_instance;
+ /* tr_action_t *type; */
+ tr_action_t *type_instance;
+};
+typedef struct tr_data_s tr_data_t;
+
+static char *tr_strdup (const char *orig) /* {{{ */
+{
+ size_t sz;
+ char *dest;
+
+ if (orig == NULL)
+ return (NULL);
+
+ sz = strlen (orig) + 1;
+ dest = (char *) malloc (sz);
+ if (dest == NULL)
+ return (NULL);
+
+ memcpy (dest, orig, sz);
+
+ return (dest);
+} /* }}} char *tr_strdup */
+
+static void tr_action_destroy (tr_action_t *act) /* {{{ */
+{
+ if (act == NULL)
+ return;
+
+ regfree (&act->re);
+ sfree (act->replacement);
+
+ if (act->next != NULL)
+ tr_action_destroy (act->next);
+
+ sfree (act);
+} /* }}} void tr_action_destroy */
+
+static int tr_config_add_action (tr_action_t **dest, /* {{{ */
+ const oconfig_item_t *ci, int may_be_empty)
+{
+ tr_action_t *act;
+ int status;
+
+ if (dest == NULL)
+ return (-EINVAL);
+
+ if ((ci->values_num != 2)
+ || (ci->values[0].type != OCONFIG_TYPE_STRING)
+ || (ci->values[1].type != OCONFIG_TYPE_STRING))
+ {
+ ERROR ("Target `replace': The `%s' option requires exactly two string "
+ "arguments.", ci->key);
+ return (-1);
+ }
+
+ act = (tr_action_t *) malloc (sizeof (*act));
+ if (act == NULL)
+ {
+ ERROR ("tr_config_add_action: malloc failed.");
+ return (-ENOMEM);
+ }
+ memset (act, 0, sizeof (*act));
+
+ act->replacement = NULL;
+ act->may_be_empty = may_be_empty;
+
+ status = regcomp (&act->re, ci->values[0].value.string, REG_EXTENDED);
+ if (status != 0)
+ {
+ char errbuf[1024] = "";
+
+ /* regerror assures null termination. */
+ regerror (status, &act->re, errbuf, sizeof (errbuf));
+ ERROR ("Target `replace': Compiling the regular expression `%s' "
+ "failed: %s.",
+ ci->values[0].value.string, errbuf);
+ sfree (act);
+ return (-EINVAL);
+ }
+
+ act->replacement = tr_strdup (ci->values[1].value.string);
+ if (act->replacement == NULL)
+ {
+ ERROR ("tr_config_add_action: tr_strdup failed.");
+ regfree (&act->re);
+ sfree (act);
+ return (-ENOMEM);
+ }
+
+ /* Insert action at end of list. */
+ if (*dest == NULL)
+ *dest = act;
+ else
+ {
+ tr_action_t *prev;
+
+ prev = *dest;
+ while (prev->next != NULL)
+ prev = prev->next;
+
+ prev->next = act;
+ }
+
+ return (0);
+} /* }}} int tr_config_add_action */
+
+static int tr_action_invoke (tr_action_t *act_head, /* {{{ */
+ char *buffer_in, size_t buffer_in_size, int may_be_empty)
+{
+ tr_action_t *act;
+ int status;
+ char buffer[DATA_MAX_NAME_LEN];
+ regmatch_t matches[8];
+
+ if (act_head == NULL)
+ return (-EINVAL);
+
+ sstrncpy (buffer, buffer_in, sizeof (buffer));
+ memset (matches, 0, sizeof (matches));
+
+ DEBUG ("target_replace plugin: tr_action_invoke: <- buffer = %s;", buffer);
+
+ for (act = act_head; act != NULL; act = act->next)
+ {
+ char temp[DATA_MAX_NAME_LEN];
+ char *subst_status;
+
+ status = regexec (&act->re, buffer,
+ STATIC_ARRAY_SIZE (matches), matches,
+ /* flags = */ 0);
+ if (status == REG_NOMATCH)
+ continue;
+ else if (status != 0)
+ {
+ char errbuf[1024] = "";
+
+ regerror (status, &act->re, errbuf, sizeof (errbuf));
+ ERROR ("Target `replace': Executing a regular expression failed: %s.",
+ errbuf);
+ continue;
+ }
+
+ subst_status = subst (temp, sizeof (temp), buffer,
+ matches[0].rm_so, matches[0].rm_eo, act->replacement);
+ if (subst_status == NULL)
+ {
+ ERROR ("Target `replace': subst (buffer = %s, start = %zu, end = %zu, "
+ "replacement = %s) failed.",
+ buffer, (size_t) matches[0].rm_so, (size_t) matches[0].rm_eo,
+ act->replacement);
+ continue;
+ }
+ sstrncpy (buffer, temp, sizeof (buffer));
+
+ DEBUG ("target_replace plugin: tr_action_invoke: -- buffer = %s;", buffer);
+ } /* for (act = act_head; act != NULL; act = act->next) */
+
+ if ((may_be_empty == 0) && (buffer[0] == 0))
+ {
+ WARNING ("Target `replace': Replacement resulted in an empty string, "
+ "which is not allowed for this buffer (`host' or `plugin').");
+ return (0);
+ }
+
+ DEBUG ("target_replace plugin: tr_action_invoke: -> buffer = %s;", buffer);
+ sstrncpy (buffer_in, buffer, buffer_in_size);
+
+ return (0);
+} /* }}} int tr_action_invoke */
+
+static int tr_destroy (void **user_data) /* {{{ */
+{
+ tr_data_t *data;
+
+ if (user_data == NULL)
+ return (-EINVAL);
+
+ data = *user_data;
+ if (data == NULL)
+ return (0);
+
+ tr_action_destroy (data->host);
+ tr_action_destroy (data->plugin);
+ tr_action_destroy (data->plugin_instance);
+ /* tr_action_destroy (data->type); */
+ tr_action_destroy (data->type_instance);
+ sfree (data);
+
+ return (0);
+} /* }}} int tr_destroy */
+
+static int tr_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
+{
+ tr_data_t *data;
+ int status;
+ int i;
+
+ data = (tr_data_t *) malloc (sizeof (*data));
+ if (data == NULL)
+ {
+ ERROR ("tr_create: malloc failed.");
+ return (-ENOMEM);
+ }
+ memset (data, 0, sizeof (*data));
+
+ data->host = NULL;
+ data->plugin = NULL;
+ data->plugin_instance = NULL;
+ /* data->type = NULL; */
+ data->type_instance = NULL;
+
+ status = 0;
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+
+ if ((strcasecmp ("Host", child->key) == 0)
+ || (strcasecmp ("Hostname", child->key) == 0))
+ status = tr_config_add_action (&data->host, child,
+ /* may be empty = */ 0);
+ else if (strcasecmp ("Plugin", child->key) == 0)
+ status = tr_config_add_action (&data->plugin, child,
+ /* may be empty = */ 0);
+ else if (strcasecmp ("PluginInstance", child->key) == 0)
+ status = tr_config_add_action (&data->plugin_instance, child,
+ /* may be empty = */ 1);
+#if 0
+ else if (strcasecmp ("Type", child->key) == 0)
+ status = tr_config_add_action (&data->type, child,
+ /* may be empty = */ 0);
+#endif
+ else if (strcasecmp ("TypeInstance", child->key) == 0)
+ status = tr_config_add_action (&data->type_instance, child,
+ /* may be empty = */ 1);
+ else
+ {
+ ERROR ("Target `replace': The `%s' configuration option is not understood "
+ "and will be ignored.", child->key);
+ status = 0;
+ }
+
+ if (status != 0)
+ break;
+ }
+
+ /* Additional sanity-checking */
+ while (status == 0)
+ {
+ if ((data->host == NULL)
+ && (data->plugin == NULL)
+ && (data->plugin_instance == NULL)
+ /* && (data->type == NULL) */
+ && (data->type_instance == NULL))
+ {
+ ERROR ("Target `replace': You need to set at lease one of `Host', "
+ "`Plugin', `PluginInstance', `Type', or `TypeInstance'.");
+ status = -1;
+ }
+
+ break;
+ }
+
+ if (status != 0)
+ {
+ tr_destroy ((void *) &data);
+ return (status);
+ }
+
+ *user_data = data;
+ return (0);
+} /* }}} int tr_create */
+
+static int tr_invoke (const data_set_t *ds, value_list_t *vl, /* {{{ */
+ notification_meta_t **meta, void **user_data)
+{
+ tr_data_t *data;
+
+ if ((ds == NULL) || (vl == NULL) || (user_data == NULL))
+ return (-EINVAL);
+
+ data = *user_data;
+ if (data == NULL)
+ {
+ ERROR ("Target `replace': Invoke: `data' is NULL.");
+ return (-EINVAL);
+ }
+
+#define HANDLE_FIELD(f,e) \
+ if (data->f != NULL) \
+ tr_action_invoke (data->f, vl->f, sizeof (vl->f), e)
+ HANDLE_FIELD (host, 0);
+ HANDLE_FIELD (plugin, 0);
+ HANDLE_FIELD (plugin_instance, 1);
+ /* HANDLE_FIELD (type); */
+ HANDLE_FIELD (type_instance, 1);
+
+ return (FC_TARGET_CONTINUE);
+} /* }}} int tr_invoke */
+
+void module_register (void)
+{
+ target_proc_t tproc;
+
+ memset (&tproc, 0, sizeof (tproc));
+ tproc.create = tr_create;
+ tproc.destroy = tr_destroy;
+ tproc.invoke = tr_invoke;
+ fc_register_target ("replace", tproc);
+} /* module_register */
+
+/* vim: set sw=2 sts=2 tw=78 et fdm=marker : */
+
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