![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/unixsock.c b/src/unixsock.c
--- /dev/null
+++ b/src/unixsock.c
@@ -0,0 +1,497 @@
+/**
+ * collectd - src/unixsock.c
+ * Copyright (C) 2007,2008 Florian octo 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 octo Forster <octo at collectd.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+#include "configfile.h"
+
+#include "utils_cmd_flush.h"
+#include "utils_cmd_getval.h"
+#include "utils_cmd_getthreshold.h"
+#include "utils_cmd_listval.h"
+#include "utils_cmd_putval.h"
+#include "utils_cmd_putnotif.h"
+
+/* Folks without pthread will need to disable this plugin. */
+#include <pthread.h>
+
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+
+#include <grp.h>
+
+#ifndef UNIX_PATH_MAX
+# define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
+#endif
+
+#define US_DEFAULT_PATH LOCALSTATEDIR"/run/"PACKAGE_NAME"-unixsock"
+
+/*
+ * Private variables
+ */
+/* valid configuration file keys */
+static const char *config_keys[] =
+{
+ "SocketFile",
+ "SocketGroup",
+ "SocketPerms",
+ "DeleteSocket"
+};
+static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
+
+static int loop = 0;
+
+/* 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 _Bool delete_socket = 0;
+
+static pthread_t listen_thread = (pthread_t) 0;
+
+/*
+ * Functions
+ */
+static int us_open_socket (void)
+{
+ struct sockaddr_un sa;
+ int status;
+
+ sock_fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (sock_fd < 0)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: socket failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (-1);
+ }
+
+ memset (&sa, '\0', sizeof (sa));
+ sa.sun_family = AF_UNIX;
+ sstrncpy (sa.sun_path, (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
+ sizeof (sa.sun_path));
+
+ DEBUG ("unixsock plugin: socket path = %s", sa.sun_path);
+
+ if (delete_socket)
+ {
+ errno = 0;
+ status = unlink (sa.sun_path);
+ if ((status != 0) && (errno != ENOENT))
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: Deleting socket file \"%s\" failed: %s",
+ sa.sun_path,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+ else if (status == 0)
+ {
+ INFO ("unixsock plugin: Successfully deleted socket file \"%s\".",
+ sa.sun_path);
+ }
+ }
+
+ status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa));
+ if (status != 0)
+ {
+ char errbuf[1024];
+ sstrerror (errno, errbuf, sizeof (errbuf));
+ ERROR ("unixsock plugin: bind failed: %s", errbuf);
+ close (sock_fd);
+ sock_fd = -1;
+ return (-1);
+ }
+
+ chmod (sa.sun_path, sock_perms);
+
+ status = listen (sock_fd, 8);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: listen failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (sock_fd);
+ sock_fd = -1;
+ return (-1);
+ }
+
+ do
+ {
+ char *grpname;
+ struct group *g;
+ struct group sg;
+ char grbuf[2048];
+
+ grpname = (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME;
+ g = NULL;
+
+ status = getgrnam_r (grpname, &sg, grbuf, sizeof (grbuf), &g);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: getgrnam_r (%s) failed: %s", grpname,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ break;
+ }
+ if (g == NULL)
+ {
+ WARNING ("unixsock plugin: No such group: `%s'",
+ grpname);
+ break;
+ }
+
+ if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
+ (uid_t) -1, g->gr_gid) != 0)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: chown (%s, -1, %i) failed: %s",
+ (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
+ (int) g->gr_gid,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+ } while (0);
+
+ return (0);
+} /* int us_open_socket */
+
+static void *us_handle_client (void *arg)
+{
+ int fdin;
+ int fdout;
+ FILE *fhin, *fhout;
+
+ fdin = *((int *) arg);
+ free (arg);
+ arg = NULL;
+
+ DEBUG ("unixsock plugin: us_handle_client: Reading from fd #%i", fdin);
+
+ fdout = dup (fdin);
+ if (fdout < 0)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: dup failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (fdin);
+ pthread_exit ((void *) 1);
+ }
+
+ fhin = fdopen (fdin, "r");
+ if (fhin == NULL)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: fdopen failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (fdin);
+ close (fdout);
+ pthread_exit ((void *) 1);
+ return ((void *) 1);
+ }
+
+ fhout = fdopen (fdout, "w");
+ if (fhout == NULL)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: fdopen failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ fclose (fhin); /* this closes fdin as well */
+ close (fdout);
+ pthread_exit ((void *) 1);
+ return ((void *) 1);
+ }
+
+ /* change output buffer to line buffered mode */
+ if (setvbuf (fhout, NULL, _IOLBF, 0) != 0)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: setvbuf failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ fclose (fhin);
+ fclose (fhout);
+ pthread_exit ((void *) 1);
+ return ((void *) 0);
+ }
+
+ while (42)
+ {
+ char buffer[1024];
+ char buffer_copy[1024];
+ char *fields[128];
+ int fields_num;
+ int len;
+
+ errno = 0;
+ if (fgets (buffer, sizeof (buffer), fhin) == NULL)
+ {
+ if ((errno == EINTR) || (errno == EAGAIN))
+ continue;
+
+ if (errno != 0)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: failed to read from socket #%i: %s",
+ fileno (fhin),
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+ break;
+ }
+
+ len = strlen (buffer);
+ while ((len > 0)
+ && ((buffer[len - 1] == '\n') || (buffer[len - 1] == '\r')))
+ buffer[--len] = '\0';
+
+ if (len == 0)
+ continue;
+
+ sstrncpy (buffer_copy, buffer, sizeof (buffer_copy));
+
+ fields_num = strsplit (buffer_copy, fields,
+ sizeof (fields) / sizeof (fields[0]));
+ if (fields_num < 1)
+ {
+ fprintf (fhout, "-1 Internal error\n");
+ fclose (fhin);
+ fclose (fhout);
+ pthread_exit ((void *) 1);
+ return ((void *) 1);
+ }
+
+ if (strcasecmp (fields[0], "getval") == 0)
+ {
+ handle_getval (fhout, buffer);
+ }
+ else if (strcasecmp (fields[0], "getthreshold") == 0)
+ {
+ handle_getthreshold (fhout, buffer);
+ }
+ else if (strcasecmp (fields[0], "putval") == 0)
+ {
+ handle_putval (fhout, buffer);
+ }
+ else if (strcasecmp (fields[0], "listval") == 0)
+ {
+ handle_listval (fhout, buffer);
+ }
+ else if (strcasecmp (fields[0], "putnotif") == 0)
+ {
+ handle_putnotif (fhout, buffer);
+ }
+ else if (strcasecmp (fields[0], "flush") == 0)
+ {
+ handle_flush (fhout, buffer);
+ }
+ else
+ {
+ if (fprintf (fhout, "-1 Unknown command: %s\n", fields[0]) < 0)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: failed to write to socket #%i: %s",
+ fileno (fhout),
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ break;
+ }
+ }
+ } /* while (fgets) */
+
+ DEBUG ("unixsock plugin: us_handle_client: Exiting..");
+ fclose (fhin);
+ fclose (fhout);
+
+ pthread_exit ((void *) 0);
+ return ((void *) 0);
+} /* void *us_handle_client */
+
+static void *us_server_thread (void __attribute__((unused)) *arg)
+{
+ int status;
+ int *remote_fd;
+ pthread_t th;
+ pthread_attr_t th_attr;
+
+ pthread_attr_init (&th_attr);
+ pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED);
+
+ if (us_open_socket () != 0)
+ pthread_exit ((void *) 1);
+
+ while (loop != 0)
+ {
+ DEBUG ("unixsock plugin: Calling accept..");
+ status = accept (sock_fd, NULL, NULL);
+ if (status < 0)
+ {
+ char errbuf[1024];
+
+ if (errno == EINTR)
+ continue;
+
+ ERROR ("unixsock plugin: accept failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (sock_fd);
+ sock_fd = -1;
+ pthread_attr_destroy (&th_attr);
+ pthread_exit ((void *) 1);
+ }
+
+ remote_fd = (int *) malloc (sizeof (int));
+ if (remote_fd == NULL)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: malloc failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (status);
+ continue;
+ }
+ *remote_fd = status;
+
+ DEBUG ("Spawning child to handle connection on fd #%i", *remote_fd);
+
+ status = plugin_thread_create (&th, &th_attr,
+ us_handle_client, (void *) remote_fd);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ WARNING ("unixsock plugin: pthread_create failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (*remote_fd);
+ free (remote_fd);
+ continue;
+ }
+ } /* while (loop) */
+
+ close (sock_fd);
+ sock_fd = -1;
+ pthread_attr_destroy (&th_attr);
+
+ status = unlink ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ NOTICE ("unixsock plugin: unlink (%s) failed: %s",
+ (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+
+ return ((void *) 0);
+} /* void *us_server_thread */
+
+static int us_config (const char *key, const char *val)
+{
+ if (strcasecmp (key, "SocketFile") == 0)
+ {
+ char *new_sock_file = strdup (val);
+ if (new_sock_file == NULL)
+ return (1);
+
+ sfree (sock_file);
+ sock_file = new_sock_file;
+ }
+ else if (strcasecmp (key, "SocketGroup") == 0)
+ {
+ char *new_sock_group = strdup (val);
+ if (new_sock_group == NULL)
+ return (1);
+
+ sfree (sock_group);
+ sock_group = new_sock_group;
+ }
+ else if (strcasecmp (key, "SocketPerms") == 0)
+ {
+ sock_perms = (int) strtol (val, NULL, 8);
+ }
+ else if (strcasecmp (key, "DeleteSocket") == 0)
+ {
+ if (IS_TRUE (val))
+ delete_socket = 1;
+ else
+ delete_socket = 0;
+ }
+ else
+ {
+ return (-1);
+ }
+
+ return (0);
+} /* int us_config */
+
+static int us_init (void)
+{
+ static int have_init = 0;
+
+ int status;
+
+ /* Initialize only once. */
+ if (have_init != 0)
+ return (0);
+ have_init = 1;
+
+ loop = 1;
+
+ status = plugin_thread_create (&listen_thread, NULL,
+ us_server_thread, NULL);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ ERROR ("unixsock plugin: pthread_create failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (-1);
+ }
+
+ return (0);
+} /* int us_init */
+
+static int us_shutdown (void)
+{
+ void *ret;
+
+ loop = 0;
+
+ if (listen_thread != (pthread_t) 0)
+ {
+ pthread_kill (listen_thread, SIGTERM);
+ pthread_join (listen_thread, &ret);
+ listen_thread = (pthread_t) 0;
+ }
+
+ plugin_unregister_init ("unixsock");
+ plugin_unregister_shutdown ("unixsock");
+
+ return (0);
+} /* int us_shutdown */
+
+void module_register (void)
+{
+ plugin_register_config ("unixsock", us_config,
+ config_keys, config_keys_num);
+ plugin_register_init ("unixsock", us_init);
+ plugin_register_shutdown ("unixsock", us_shutdown);
+} /* void module_register (void) */
+
+/* vim: set sw=4 ts=4 sts=4 tw=78 : */