From: Florian Forster Date: Sun, 28 Jan 2007 11:22:17 +0000 (+0100) Subject: unixsock plugin: Added a first version of a UNIX-socket output plugin. X-Git-Tag: collectd-4.0.0~211^2~13 X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=86090b3d409634d016da7bbb0cbe43ed5a851d30 unixsock plugin: Added a first version of a UNIX-socket output plugin. The goal is to build a nagios-interface on top of this. --- diff --git a/configure.in b/configure.in index 0b0aa890..23f0e59e 100644 --- a/configure.in +++ b/configure.in @@ -1005,6 +1005,7 @@ AC_COLLECTD([serial], [disable], [module], [serial statistics]) AC_COLLECTD([swap], [disable], [module], [swap statistics]) AC_COLLECTD([tape], [disable], [module], [tape statistics]) AC_COLLECTD([traffic], [disable], [module], [system traffic statistics]) +AC_COLLECTD([unixsock], [disable], [module], [UNIX socket plugin]) AC_COLLECTD([users], [disable], [module], [user count statistics]) AC_COLLECTD([vserver], [disable], [module], [vserver statistics]) AC_COLLECTD([wireless], [disable], [module], [wireless link statistics]) @@ -1061,6 +1062,7 @@ Configuration: swap . . . . . . . $enable_swap tape . . . . . . . $enable_tape traffic . . . . . . $enable_traffic + unixsock . . . . . $enable_unixsock users . . . . . . . $enable_users vserver . . . . . . $enable_vserver wireless . . . . . $enable_wireless diff --git a/src/Makefile.am b/src/Makefile.am index 87dcec07..d9d90ef1 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -18,6 +18,7 @@ collectd_SOURCES = collectd.c collectd.h \ plugin.c plugin.h \ configfile.c configfile.h collectd_CPPFLAGS = $(LTDLINCL) +collectd_CPPFLAGS += -DPREFIX='"${prefix}"' collectd_CPPFLAGS += -DCONFIGFILE='"${sysconfdir}/${PACKAGE_NAME}.conf"' collectd_CPPFLAGS += -DPKGLOCALSTATEDIR='"${localstatedir}/lib/${PACKAGE_NAME}"' if BUILD_FEATURE_DAEMON @@ -430,6 +431,17 @@ traffic_la_LDFLAGS += -lstatgrab endif endif +if BUILD_MODULE_UNIXSOCK +pkglib_LTLIBRARIES += unixsock.la +unixsock_la_SOURCES = unixsock.c +unixsock_la_LDFLAGS = -module -avoid-version +if BUILD_WITH_LIBPTHREAD +unixsock_la_LDFLAGS += -lpthread +endif +collectd_LDADD += "-dlopen" unixsock.la +collectd_DEPENDENCIES += unixsock.la +endif + if BUILD_MODULE_USERS pkglib_LTLIBRARIES += users.la users_la_SOURCES = users.c diff --git a/src/unixsock.c b/src/unixsock.c new file mode 100644 index 00000000..84d49fd6 --- /dev/null +++ b/src/unixsock.c @@ -0,0 +1,656 @@ +/** + * collectd - src/unixsock.c + * Copyright (C) 2007 Florian octo 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 + * + * Author: + * Florian octo Forster + **/ + +#include "collectd.h" +#include "common.h" +#include "plugin.h" +#include "configfile.h" +#include "utils_debug.h" + +/* Folks without pthread will need to disable this plugin. */ +#include + +#include +#include +#include + +#include + +#ifndef UNIX_PATH_MAX +# define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path) +#endif + +#define US_DEFAULT_PATH PREFIX"/var/run/"PACKAGE_NAME"-unixsock" + +/* + * Private data structures + */ +/* linked list of cached values */ +typedef struct value_cache_s +{ + char name[4*DATA_MAX_NAME_LEN]; + int values_num; + gauge_t *gauge; + counter_t *counter; + time_t time; + struct value_cache_s *next; +} value_cache_t; + +/* + * Private variables + */ +/* valid configuration file keys */ +static const char *config_keys[] = +{ + "SocketFile", + "SocketGroup", + "SocketPerms", + NULL +}; +static int config_keys_num = 3; + +/* socket configuration */ +static int sock_fd = -1; +static char *sock_file = NULL; +static char *sock_group = NULL; +static int sock_perms = S_IRWXU | S_IRWXG; + +static pthread_t listen_thread = -1; + +/* Linked list and auxilliary variables for saving values */ +static value_cache_t *cache_head = NULL; +static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER; +static unsigned int cache_oldest = UINT_MAX; + +/* + * Functions + */ +static value_cache_t *cache_search (const char *name) +{ + value_cache_t *vc; + + for (vc = cache_head; vc != NULL; vc = vc->next) + { + if (strcmp (vc->name, name) == 0) + break; + } /* for vc = cache_head .. NULL */ + + return (vc); +} /* value_cache_t *cache_search */ + +static int cache_alloc_name (char *ret, int ret_len, + const char *plugin, const char *plugin_instance, + const char *type, const char *type_instance) +{ + int status; + + assert (plugin != NULL); + assert (type != NULL); + + if ((plugin_instance == NULL) || (strlen (plugin_instance) == 0)) + { + if ((type_instance == NULL) || (strlen (type_instance) == 0)) + status = snprintf (ret, ret_len, "%s/%s", + plugin, type); + else + status = snprintf (ret, ret_len, "%s/%s-%s", + plugin, type, type_instance); + } + else + { + if ((type_instance == NULL) || (strlen (type_instance) == 0)) + status = snprintf (ret, ret_len, "%s-%s/%s", + plugin, plugin_instance, type); + else + status = snprintf (ret, ret_len, "%s-%s/%s-%s", + plugin, plugin_instance, + type, type_instance); + } + + if ((status < 1) || (status >= ret_len)) + return (-1); + return (0); +} /* int cache_alloc_name */ + +static int cache_insert (const data_set_t *ds, const value_list_t *vl) +{ + /* We're called from `cache_update' so we don't need to lock the mutex */ + value_cache_t *vc; + int i; + + DBG ("ds->ds_num = %i; vl->values_len = %i;", + ds->ds_num, vl->values_len); + assert (ds->ds_num == vl->values_len); + + vc = (value_cache_t *) malloc (sizeof (value_cache_t)); + if (vc == NULL) + { + pthread_mutex_unlock (&cache_lock); + syslog (LOG_ERR, "unixsock plugin: malloc failed: %s", + strerror (errno)); + return (-1); + } + + vc->gauge = (gauge_t *) malloc (sizeof (gauge_t) * vl->values_len); + if (vc->gauge == NULL) + { + pthread_mutex_unlock (&cache_lock); + syslog (LOG_ERR, "unixsock plugin: malloc failed: %s", + strerror (errno)); + free (vc); + return (-1); + } + + vc->counter = (counter_t *) malloc (sizeof (counter_t) * vl->values_len); + if (vc->counter == NULL) + { + pthread_mutex_unlock (&cache_lock); + syslog (LOG_ERR, "unixsock plugin: malloc failed: %s", + strerror (errno)); + free (vc->gauge); + free (vc); + return (-1); + } + + if (cache_alloc_name (vc->name, sizeof (vc->name), + vl->plugin, vl->plugin_instance, + ds->type, vl->type_instance) != 0) + { + pthread_mutex_unlock (&cache_lock); + syslog (LOG_ERR, "unixsock plugin: cache_alloc_name failed."); + free (vc->counter); + free (vc->gauge); + free (vc); + return (-1); + } + + for (i = 0; i < ds->ds_num; i++) + { + if (ds->ds[i].type == DS_TYPE_COUNTER) + { + vc->gauge[i] = 0.0; + vc->counter[i] = vl->values[i].counter; + } + else if (ds->ds[i].type == DS_TYPE_GAUGE) + { + vc->gauge[i] = vl->values[i].gauge; + vc->counter[i] = 0; + } + else + { + vc->gauge[i] = 0.0; + vc->counter[i] = 0; + } + } + vc->values_num = ds->ds_num; + + vc->next = cache_head; + cache_head = vc; + + vc->time = vl->time; + if (vc->time < cache_oldest) + cache_oldest = vc->time; + + pthread_mutex_unlock (&cache_lock); + return (0); +} /* int cache_insert */ + +static int cache_update (const data_set_t *ds, const value_list_t *vl) +{ + char name[4*DATA_MAX_NAME_LEN];; + value_cache_t *vc; + int i; + + if (cache_alloc_name (name, sizeof (name), + vl->plugin, vl->plugin_instance, + ds->type, vl->type_instance) != 0) + return (-1); + + pthread_mutex_lock (&cache_lock); + + vc = cache_search (name); + + if (vc == NULL) + return (cache_insert (ds, vl)); + + assert (vc->values_num == ds->ds_num); + assert (vc->values_num == vl->values_len); + + /* + * Update the values. This is possibly a lot more that you'd expect + * because we honor min and max values and handle counter overflows here. + */ + for (i = 0; i < ds->ds_num; i++) + { + if (ds->ds[i].type == DS_TYPE_COUNTER) + { + if (vl->values[i].counter < vc->counter[i]) + { + if (vl->values[i].counter <= 4294967295U) + { + vc->gauge[i] = ((4294967295U - vl->values[i].counter) + + vc->counter[i]) / (vl->time - vc->time); + } + else + { + vc->gauge[i] = ((18446744073709551615ULL - vl->values[i].counter) + + vc->counter[i]) / (vl->time - vc->time); + } + } + else + { + vc->gauge[i] = (vl->values[i].counter - vc->counter[i]) + / (vl->time - vc->time); + } + + DBG ("name = %s; old counter: %llu; new counter: %llu; rate: %lf;", + name, + vc->counter[i], vl->values[i].counter, + vc->gauge[i]); + + vc->counter[i] = vl->values[i].counter; + } + else if (ds->ds[i].type == DS_TYPE_GAUGE) + { + vc->gauge[i] = vl->values[i].gauge; + vc->counter[i] = 0; + + DBG ("name, %s; gauge: %lf;", + name, vc->gauge[i]); + } + else + { + vc->gauge[i] = NAN; + vc->counter[i] = 0; + } + + if ((vc->gauge[i] == NAN) + || ((ds->ds[i].min != NAN) && (vc->gauge[i] < ds->ds[i].min)) + || ((ds->ds[i].max != NAN) && (vc->gauge[i] > ds->ds[i].max))) + vc->gauge[i] = NAN; + } /* for i = 0 .. ds->ds_num */ + + vc->time = vl->time; + + if (vc->time < cache_oldest) + cache_oldest = vc->time; + + pthread_mutex_unlock (&cache_lock); + return (0); +} /* int cache_update */ + +static void cache_flush (int max_age) +{ + value_cache_t *this; + value_cache_t *prev; + time_t now; + + pthread_mutex_lock (&cache_lock); + + now = time (NULL); + + if ((now - cache_oldest) <= max_age) + { + pthread_mutex_unlock (&cache_lock); + return; + } + + cache_oldest = now; + + prev = NULL; + this = cache_head; + + while (this != NULL) + { + if ((now - this->time) <= max_age) + { + if (this->time < cache_oldest) + cache_oldest = this->time; + + prev = this; + this = this->next; + continue; + } + + if (prev == NULL) + cache_head = this->next; + else + prev->next = this->next; + + free (this->gauge); + free (this->counter); + free (this); + + if (prev == NULL) + this = cache_head; + else + this = prev->next; + } /* while (this != NULL) */ + + pthread_mutex_unlock (&cache_lock); +} /* int cache_flush */ + +static int us_open_socket (void) +{ + struct sockaddr_un sa; + int status; + + sock_fd = socket (PF_UNIX, SOCK_STREAM, 0); + if (sock_fd < 0) + { + syslog (LOG_ERR, "unixsock plugin: socket failed: %s", + strerror (errno)); + return (-1); + } + + memset (&sa, '\0', sizeof (sa)); + sa.sun_family = AF_UNIX; + strncpy (sa.sun_path, (sock_file != NULL) ? sock_file : US_DEFAULT_PATH, + sizeof (sa.sun_path) - 1); + /* unlink (sa.sun_path); */ + + status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa)); + if (status != 0) + { + DBG ("bind failed: %s; sa.sun_path = %s", + strerror (errno), sa.sun_path); + syslog (LOG_ERR, "unixsock plugin: bind failed: %s", + strerror (errno)); + close (sock_fd); + sock_fd = -1; + return (-1); + } + + status = listen (sock_fd, 8); + if (status != 0) + { + syslog (LOG_ERR, "unixsock plugin: listen failed: %s", + strerror (errno)); + close (sock_fd); + sock_fd = -1; + return (-1); + } + + do + { + struct group *g; + + errno = 0; + g = getgrnam ((sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME); + + if (errno != 0) + { + syslog (LOG_WARNING, "unixsock plugin: getgrnam (%s) failed: %s", + (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME, + strerror (errno)); + break; + } + + if (g == NULL) + break; + + if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH, + (uid_t) -1, g->gr_gid) != 0) + { + syslog (LOG_WARNING, "unixsock plugin: chown (%s, -1, %i) failed: %s", + (sock_file != NULL) ? sock_file : US_DEFAULT_PATH, + (int) g->gr_gid, + strerror (errno)); + } + } while (0); + + return (0); +} /* int us_open_socket */ + +static int us_handle_getval (FILE *fh, char **fields, int fields_num) +{ + char *plugin = fields[1]; + char *plugin_instance; + char *type; + char *type_instance; + char name[4*DATA_MAX_NAME_LEN]; + value_cache_t *vc; + int status; + int i; + + if (fields_num != 2) + return (-1); + + type = strchr (plugin, '/'); + if (type == NULL) + return (-1); + *type = '\0'; type++; + + plugin_instance = strchr (plugin, '-'); + if (plugin_instance != NULL) + { + *plugin_instance = '\0'; + plugin_instance++; + } + + type_instance = strchr (type, '-'); + if (type_instance != NULL) + { + *type_instance = '\0'; + type_instance++; + } + + status = cache_alloc_name (name, sizeof (name), + plugin, plugin_instance, type, type_instance); + if (status != 0) + return (-1); + + pthread_mutex_lock (&cache_lock); + + vc = cache_search (name); + + fprintf (fh, "%i", vc->values_num); + for (i = 0; i < vc->values_num; i++) + { + if (vc->gauge[i] == NAN) + fprintf (fh, " NaN"); + else + fprintf (fh, " %12e", vc->gauge[i]); + } + + /* Free the mutex as soon as possible and definitely before flushing */ + pthread_mutex_unlock (&cache_lock); + + fprintf (fh, "\n"); + fflush (fh); + + return (0); +} /* int us_handle_getval */ + +static void *us_handle_client (void *arg) +{ + int fd; + FILE *fh; + char buffer[1024]; + char *fields[128]; + int fields_num; + + fd = *((int *) arg); + free (arg); + arg = NULL; + + DBG ("Reading from fd #%i", fd); + + fh = fdopen (fd, "r+"); + if (fh == NULL) + { + syslog (LOG_ERR, "unixsock plugin: fdopen failed: %s", + strerror (errno)); + close (fd); + pthread_exit ((void *) 1); + } + + while (fgets (buffer, sizeof (buffer), fh) != NULL) + { + DBG ("fgets -> buffer = %s", buffer); + + fields_num = strsplit (buffer, fields, + sizeof (fields) / sizeof (fields[0])); + + if (fields_num < 1) + { + close (fd); + break; + } + + if (strcasecmp (fields[0], "getval") == 0) + { + us_handle_getval (fh, fields, fields_num); + } + else + { + fprintf (fh, "Unknown command: %s\n", fields[0]); + fflush (fh); + } + } /* while (fgets) */ + + DBG ("Exiting.."); + close (fd); + + pthread_exit ((void *) 0); +} /* void *us_handle_client */ + +static void *us_server_thread (void *arg) +{ + int status; + int *remote_fd; + pthread_t th; + + if (us_open_socket () != 0) + pthread_exit ((void *) 1); + + while (42) + { + DBG ("Calling accept.."); + status = accept (sock_fd, NULL, NULL); + if (status < 0) + { + if (errno == EINTR) + continue; + + syslog (LOG_ERR, "unixsock plugin: accept failed: %s", + strerror (errno)); + close (sock_fd); + sock_fd = -1; + pthread_exit ((void *) 1); + } + + remote_fd = (int *) malloc (sizeof (int)); + if (remote_fd == NULL) + { + syslog (LOG_WARNING, "unixsock plugin: malloc failed: %s", + strerror (errno)); + close (status); + continue; + } + *remote_fd = status; + + DBG ("Spawning child to handle connection on fd #%i", *remote_fd); + + status = pthread_create (&th, NULL, us_handle_client, (void *) remote_fd); + if (status != 0) + { + syslog (LOG_WARNING, "unixsock plugin: pthread_create failed: %s", + strerror (status)); + close (*remote_fd); + free (remote_fd); + continue; + } + } /* while (42) */ + + return ((void *) 0); +} /* void *us_server_thread */ + +static int us_config (const char *key, const char *val) +{ + if (strcasecmp (key, "SocketFile") == 0) + { + sfree (sock_file); + sock_file = strdup (val); + } + else if (strcasecmp (key, "SocketGroup") == 0) + { + sfree (sock_group); + sock_group = strdup (val); + } + else if (strcasecmp (key, "SocketPerms") == 0) + { + sock_perms = (int) strtol (val, NULL, 8); + } + else + { + return (-1); + } + + return (0); +} /* int us_config */ + +static int us_init (void) +{ + int status; + + status = pthread_create (&listen_thread, NULL, us_server_thread, NULL); + if (status != 0) + { + syslog (LOG_ERR, "unixsock plugin: pthread_create failed: %s", + strerror (status)); + return (-1); + } + + return (0); +} /* int us_init */ + +static int us_shutdown (void) +{ + void *ret; + + if (listen_thread >= 0) + { + pthread_kill (listen_thread, SIGTERM); + pthread_join (listen_thread, &ret); + } + + return (0); +} /* int us_shutdown */ + +static int us_write (const data_set_t *ds, const value_list_t *vl) +{ + cache_update (ds, vl); + cache_flush (2 * atoi (COLLECTD_STEP)); + + return (0); +} + +void module_register (void) +{ + plugin_register_config ("unixsock", us_config, + config_keys, config_keys_num); + plugin_register_init ("unixsock", us_init); + plugin_register_write ("unixsock", us_write); + plugin_register_shutdown ("unixsock", us_shutdown); +} /* void module_register (void) */ + +/* vim: set sw=4 ts=4 sts=4 tw=78 : */