/src/target_replace.c
C | 565 lines | 431 code | 98 blank | 36 comment | 157 complexity | dccb948d2a38769d9a67e8bbbd3c2e30 MD5 | raw file
Possible License(s): GPL-2.0
- /**
- * collectd - src/target_replace.c
- * Copyright (C) 2008 Florian Forster
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- * Florian Forster <octo at collectd.org>
- **/
- #include "collectd.h"
- #include "filter_chain.h"
- #include "utils/common/common.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;
- bool may_be_empty;
- tr_action_t *next;
- };
- struct tr_meta_data_action_s;
- typedef struct tr_meta_data_action_s tr_meta_data_action_t;
- struct tr_meta_data_action_s {
- char *key;
- regex_t re;
- char *replacement;
- tr_meta_data_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;
- tr_meta_data_action_t *meta;
- };
- 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 = 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 void tr_meta_data_action_destroy(tr_meta_data_action_t *act) /* {{{ */
- {
- if (act == NULL)
- return;
- sfree(act->key);
- regfree(&act->re);
- sfree(act->replacement);
- if (act->next != NULL)
- tr_meta_data_action_destroy(act->next);
- sfree(act);
- } /* }}} void tr_meta_data_action_destroy */
- static int tr_config_add_action(tr_action_t **dest, /* {{{ */
- const oconfig_item_t *ci, bool 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 = calloc(1, sizeof(*act));
- if (act == NULL) {
- ERROR("tr_config_add_action: calloc failed.");
- return -ENOMEM;
- }
- 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.");
- tr_action_destroy(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_config_add_meta_action(tr_meta_data_action_t **dest, /* {{{ */
- const oconfig_item_t *ci,
- bool should_delete) {
- tr_meta_data_action_t *act;
- int status;
- if (dest == NULL)
- return -EINVAL;
- if (should_delete) {
- 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;
- }
- } else {
- if ((ci->values_num != 3) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
- (ci->values[1].type != OCONFIG_TYPE_STRING) ||
- (ci->values[2].type != OCONFIG_TYPE_STRING)) {
- ERROR("Target `replace': The `%s' option requires exactly three string "
- "arguments.",
- ci->key);
- return -1;
- }
- }
- if (strlen(ci->values[0].value.string) == 0) {
- ERROR("Target `replace': The `%s' option does not accept empty string as "
- "first argument.",
- ci->key);
- return -1;
- }
- act = calloc(1, sizeof(*act));
- if (act == NULL) {
- ERROR("tr_config_add_meta_action: calloc failed.");
- return -ENOMEM;
- }
- act->key = NULL;
- act->replacement = NULL;
- status = regcomp(&act->re, ci->values[1].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[1].value.string, errbuf);
- sfree(act->key);
- sfree(act);
- return -EINVAL;
- }
- act->key = tr_strdup(ci->values[0].value.string);
- if (act->key == NULL) {
- ERROR("tr_config_add_meta_action: tr_strdup failed.");
- tr_meta_data_action_destroy(act);
- return -ENOMEM;
- }
- if (!should_delete) {
- act->replacement = tr_strdup(ci->values[2].value.string);
- if (act->replacement == NULL) {
- ERROR("tr_config_add_meta_action: tr_strdup failed.");
- tr_meta_data_action_destroy(act);
- return -ENOMEM;
- }
- }
- /* Insert action at end of list. */
- if (*dest == NULL)
- *dest = act;
- else {
- tr_meta_data_action_t *prev;
- prev = *dest;
- while (prev->next != NULL)
- prev = prev->next;
- prev->next = act;
- }
- return 0;
- } /* }}} int tr_config_add_meta_action */
- static int tr_action_invoke(tr_action_t *act_head, /* {{{ */
- char *buffer_in, size_t buffer_in_size,
- bool may_be_empty) {
- int status;
- char buffer[DATA_MAX_NAME_LEN];
- regmatch_t matches[8] = {[0] = {0}};
- if (act_head == NULL)
- return -EINVAL;
- sstrncpy(buffer, buffer_in, sizeof(buffer));
- DEBUG("target_replace plugin: tr_action_invoke: <- buffer = %s;", buffer);
- for (tr_action_t *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, (size_t)matches[0].rm_so,
- (size_t)matches[0].rm_eo, act->replacement);
- if (subst_status == NULL) {
- ERROR("Target `replace': subst (buffer = %s, start = %" PRIsz
- ", end = %" PRIsz ", "
- "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 == false) && (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_meta_data_action_invoke(/* {{{ */
- tr_meta_data_action_t *act_head,
- meta_data_t **dest) {
- int status;
- regmatch_t matches[8] = {[0] = {0}};
- if (act_head == NULL)
- return -EINVAL;
- if ((*dest) == NULL) /* nothing to do */
- return 0;
- for (tr_meta_data_action_t *act = act_head; act != NULL; act = act->next) {
- char temp[DATA_MAX_NAME_LEN];
- char *subst_status;
- int value_type;
- int meta_data_status;
- char *value;
- meta_data_t *result;
- value_type = meta_data_type(*dest, act->key);
- if (value_type == 0) /* not found */
- continue;
- if (value_type != MD_TYPE_STRING) {
- WARNING("Target `replace': Attempting replace on metadata key `%s', "
- "which isn't a string.",
- act->key);
- continue;
- }
- meta_data_status = meta_data_get_string(*dest, act->key, &value);
- if (meta_data_status != 0) {
- ERROR("Target `replace': Unable to retrieve metadata value for `%s'.",
- act->key);
- return meta_data_status;
- }
- DEBUG("target_replace plugin: tr_meta_data_action_invoke: `%s' "
- "old value = `%s'",
- act->key, value);
- status = regexec(&act->re, value, STATIC_ARRAY_SIZE(matches), matches,
- /* flags = */ 0);
- if (status == REG_NOMATCH) {
- sfree(value);
- 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);
- sfree(value);
- continue;
- }
- if (act->replacement == NULL) {
- /* no replacement; delete the key */
- DEBUG("target_replace plugin: tr_meta_data_action_invoke: "
- "deleting `%s'",
- act->key);
- meta_data_delete(*dest, act->key);
- sfree(value);
- continue;
- }
- subst_status = subst(temp, sizeof(temp), value, (size_t)matches[0].rm_so,
- (size_t)matches[0].rm_eo, act->replacement);
- if (subst_status == NULL) {
- ERROR("Target `replace': subst (value = %s, start = %" PRIsz
- ", end = %" PRIsz ", "
- "replacement = %s) failed.",
- value, (size_t)matches[0].rm_so, (size_t)matches[0].rm_eo,
- act->replacement);
- sfree(value);
- continue;
- }
- DEBUG("target_replace plugin: tr_meta_data_action_invoke: `%s' "
- "value `%s' -> `%s'",
- act->key, value, temp);
- if ((result = meta_data_create()) == NULL) {
- ERROR("Target `replace': failed to create metadata for `%s'.", act->key);
- sfree(value);
- return -ENOMEM;
- }
- meta_data_status = meta_data_add_string(result, act->key, temp);
- if (meta_data_status != 0) {
- ERROR("Target `replace': Unable to set metadata value for `%s'.",
- act->key);
- meta_data_destroy(result);
- sfree(value);
- return meta_data_status;
- }
- meta_data_clone_merge(dest, result);
- meta_data_destroy(result);
- sfree(value);
- } /* for (act = act_head; act != NULL; act = act->next) */
- return 0;
- } /* }}} int tr_meta_data_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);
- tr_meta_data_action_destroy(data->meta);
- 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;
- data = calloc(1, sizeof(*data));
- if (data == NULL) {
- ERROR("tr_create: calloc failed.");
- return -ENOMEM;
- }
- data->host = NULL;
- data->plugin = NULL;
- data->plugin_instance = NULL;
- /* data->type = NULL; */
- data->type_instance = NULL;
- data->meta = NULL;
- status = 0;
- for (int 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 = */ false);
- else if (strcasecmp("Plugin", child->key) == 0)
- status = tr_config_add_action(&data->plugin, child,
- /* may be empty = */ false);
- else if (strcasecmp("PluginInstance", child->key) == 0)
- status = tr_config_add_action(&data->plugin_instance, child,
- /* may be empty = */ true);
- #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 = */ true);
- else if (strcasecmp("MetaData", child->key) == 0)
- status = tr_config_add_meta_action(&data->meta, child,
- /* should delete = */ false);
- else if (strcasecmp("DeleteMetaData", child->key) == 0)
- status = tr_config_add_meta_action(&data->meta, child,
- /* should delete = */ true);
- 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) && (data->meta == NULL)) {
- ERROR("Target `replace': You need to set at least one of `Host', "
- "`Plugin', `PluginInstance' 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 __attribute__((unused)) * *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;
- }
- if (data->meta != NULL) {
- tr_meta_data_action_invoke(data->meta, &(vl->meta));
- }
- #define HANDLE_FIELD(f, e) \
- if (data->f != NULL) \
- tr_action_invoke(data->f, vl->f, sizeof(vl->f), e)
- HANDLE_FIELD(host, false);
- HANDLE_FIELD(plugin, false);
- HANDLE_FIELD(plugin_instance, true);
- /* HANDLE_FIELD (type, false); */
- HANDLE_FIELD(type_instance, true);
- return FC_TARGET_CONTINUE;
- } /* }}} int tr_invoke */
- void module_register(void) {
- target_proc_t tproc = {0};
- tproc.create = tr_create;
- tproc.destroy = tr_destroy;
- tproc.invoke = tr_invoke;
- fc_register_target("replace", tproc);
- } /* module_register */