* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
- * Florian octo Forster <octo at verplant.org>
+ * Florian octo Forster <octo at collectd.org>
* Michael Stapelberg <michael+git at stapelberg.de>
**/
#endif
#if KERNEL_LINUX
+# include <asm/types.h>
+/* sys/socket.h is necessary to compile when using netlink on older systems. */
+# include <sys/socket.h>
+# include <linux/netlink.h>
+#if HAVE_LINUX_INET_DIAG_H
+# include <linux/inet_diag.h>
+#endif
+# include <sys/socket.h>
+# include <arpa/inet.h>
/* #endif KERNEL_LINUX */
#elif HAVE_SYSCTLBYNAME
#endif /* KERNEL_AIX */
#if KERNEL_LINUX
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
+struct nlreq {
+ struct nlmsghdr nlh;
+ struct inet_diag_req r;
+};
+#endif
+
static const char *tcp_state[] =
{
"", /* 0 */
"CLOSED",
"LISTEN",
"SYN_SENT",
- "SYN_RCVD",
+ "SYN_RECV",
"ESTABLISHED",
"CLOSE_WAIT",
- "FIN_WAIT_1",
+ "FIN_WAIT1",
"CLOSING",
"LAST_ACK",
- "FIN_WAIT_2",
+ "FIN_WAIT2",
"TIME_WAIT"
};
{
"ListeningPorts",
"LocalPort",
- "RemotePort"
+ "RemotePort",
+ "AllPortsSummary"
};
static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
static int port_collect_listening = 0;
+static int port_collect_total = 0;
static port_entry_t *port_list_head = NULL;
+static uint32_t count_total[TCP_STATE_MAX + 1];
+
+#if KERNEL_LINUX
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
+/* This depends on linux inet_diag_req because if this structure is missing,
+ * sequence_number is useless and we get a compilation warning.
+ */
+static uint32_t sequence_number = 0;
+#endif
+
+enum
+{
+ SRC_DUNNO,
+ SRC_NETLINK,
+ SRC_PROC
+} linux_source = SRC_DUNNO;
+#endif
+
+static void conn_prepare_vl (value_list_t *vl, value_t *values)
+{
+ vl->values = values;
+ vl->values_len = 1;
+ sstrncpy (vl->host, hostname_g, sizeof (vl->host));
+ sstrncpy (vl->plugin, "tcpconns", sizeof (vl->plugin));
+ sstrncpy (vl->type, "tcp_connections", sizeof (vl->type));
+}
static void conn_submit_port_entry (port_entry_t *pe)
{
value_list_t vl = VALUE_LIST_INIT;
int i;
- vl.values = values;
- vl.values_len = 1;
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "tcpconns", sizeof (vl.plugin));
- sstrncpy (vl.type, "tcp_connections", sizeof (vl.type));
+ conn_prepare_vl (&vl, values);
if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
|| (pe->flags & PORT_COLLECT_LOCAL))
}
} /* void conn_submit */
+static void conn_submit_port_total (void)
+{
+ value_t values[1];
+ value_list_t vl = VALUE_LIST_INIT;
+ int i;
+
+ conn_prepare_vl (&vl, values);
+
+ sstrncpy (vl.plugin_instance, "all", sizeof (vl.plugin_instance));
+
+ for (i = 1; i <= TCP_STATE_MAX; i++)
+ {
+ vl.values[0].gauge = count_total[i];
+
+ sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
+
+ plugin_dispatch_values (&vl);
+ }
+}
+
static void conn_submit_all (void)
{
port_entry_t *pe;
+ if (port_collect_total)
+ conn_submit_port_total ();
+
for (pe = port_list_head; pe != NULL; pe = pe->next)
conn_submit_port_entry (pe);
} /* void conn_submit_all */
port_entry_t *prev = NULL;
port_entry_t *pe = port_list_head;
+ memset (&count_total, '\0', sizeof(count_total));
+
while (pe != NULL)
{
/* If this entry was created while reading the files (ant not when handling
* the configuration) remove it now. */
if ((pe->flags & (PORT_COLLECT_LOCAL
- | PORT_COLLECT_REMOTE
- | PORT_IS_LISTENING)) == 0)
+ | PORT_COLLECT_REMOTE
+ | PORT_IS_LISTENING)) == 0)
{
port_entry_t *next = pe->next;
DEBUG ("tcpconns plugin: Removing temporary entry "
- "for listening port %"PRIu16, pe->port);
+ "for listening port %"PRIu16, pe->port);
if (prev == NULL)
- port_list_head = next;
+ port_list_head = next;
else
- prev->next = next;
+ prev->next = next;
sfree (pe);
pe = next;
memset (pe->count_remote, '\0', sizeof (pe->count_remote));
pe->flags &= ~PORT_IS_LISTENING;
+ prev = pe;
pe = pe->next;
}
} /* void conn_reset_port_entry */
return (-1);
}
+ count_total[state]++;
+
/* Listening sockets */
if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
{
} /* int conn_handle_ports */
#if KERNEL_LINUX
+/* Returns zero on success, less than zero on socket error and greater than
+ * zero on other errors. */
+static int conn_read_netlink (void)
+{
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
+ int fd;
+ struct sockaddr_nl nladdr;
+ struct nlreq req;
+ struct msghdr msg;
+ struct iovec iov;
+ struct inet_diag_msg *r;
+ char buf[8192];
+
+ /* If this fails, it's likely a permission problem. We'll fall back to
+ * reading this information from files below. */
+ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
+ if (fd < 0)
+ {
+ ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
+ "NETLINK_INET_DIAG) failed: %s",
+ sstrerror (errno, buf, sizeof (buf)));
+ return (-1);
+ }
+
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+
+ memset(&req, 0, sizeof(req));
+ req.nlh.nlmsg_len = sizeof(req);
+ req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
+ /* NLM_F_ROOT: return the complete table instead of a single entry.
+ * NLM_F_MATCH: return all entries matching criteria (not implemented)
+ * NLM_F_REQUEST: must be set on all request messages */
+ req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+ req.nlh.nlmsg_pid = 0;
+ /* The sequence_number is used to track our messages. Since netlink is not
+ * reliable, we don't want to end up with a corrupt or incomplete old
+ * message in case the system is/was out of memory. */
+ req.nlh.nlmsg_seq = ++sequence_number;
+ req.r.idiag_family = AF_INET;
+ req.r.idiag_states = 0xfff;
+ req.r.idiag_ext = 0;
+
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = &req;
+ iov.iov_len = sizeof(req);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = (void*)&nladdr;
+ msg.msg_namelen = sizeof(nladdr);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+
+ if (sendmsg (fd, &msg, 0) < 0)
+ {
+ ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
+ sstrerror (errno, buf, sizeof (buf)));
+ close (fd);
+ return (-1);
+ }
+
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ while (1)
+ {
+ int status;
+ struct nlmsghdr *h;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = (void*)&nladdr;
+ msg.msg_namelen = sizeof(nladdr);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+
+ status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
+ if (status < 0)
+ {
+ if ((errno == EINTR) || (errno == EAGAIN))
+ continue;
+
+ ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
+ sstrerror (errno, buf, sizeof (buf)));
+ close (fd);
+ return (-1);
+ }
+ else if (status == 0)
+ {
+ close (fd);
+ DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
+ "reply from netlink socket.");
+ return (0);
+ }
+
+ h = (struct nlmsghdr*)buf;
+ while (NLMSG_OK(h, status))
+ {
+ if (h->nlmsg_seq != sequence_number)
+ {
+ h = NLMSG_NEXT(h, status);
+ continue;
+ }
+
+ if (h->nlmsg_type == NLMSG_DONE)
+ {
+ close (fd);
+ return (0);
+ }
+ else if (h->nlmsg_type == NLMSG_ERROR)
+ {
+ struct nlmsgerr *msg_error;
+
+ msg_error = NLMSG_DATA(h);
+ WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
+ msg_error->error);
+
+ close (fd);
+ return (1);
+ }
+
+ r = NLMSG_DATA(h);
+
+ /* This code does not (need to) distinguish between IPv4 and IPv6. */
+ conn_handle_ports (ntohs(r->id.idiag_sport),
+ ntohs(r->id.idiag_dport),
+ r->idiag_state);
+
+ h = NLMSG_NEXT(h, status);
+ } /* while (NLMSG_OK) */
+ } /* while (1) */
+
+ /* Not reached because the while() loop above handles the exit condition. */
+ return (0);
+#else
+ return (1);
+#endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
+} /* int conn_read_netlink */
+
static int conn_handle_line (char *buffer)
{
char *fields[32];
else
pe->flags |= PORT_COLLECT_REMOTE;
}
+ else if (strcasecmp (key, "AllPortsSummary") == 0)
+ {
+ if (IS_TRUE (value))
+ port_collect_total = 1;
+ else
+ port_collect_total = 0;
+ }
else
{
return (-1);
#if KERNEL_LINUX
static int conn_init (void)
{
- if (port_list_head == NULL)
+ if (port_collect_total == 0 && port_list_head == NULL)
port_collect_listening = 1;
return (0);
static int conn_read (void)
{
- int errors_num = 0;
+ int status;
conn_reset_port_entry ();
- if (conn_read_file ("/proc/net/tcp") != 0)
- errors_num++;
- if (conn_read_file ("/proc/net/tcp6") != 0)
- errors_num++;
-
- if (errors_num < 2)
+ if (linux_source == SRC_NETLINK)
{
- conn_submit_all ();
+ status = conn_read_netlink ();
}
- else
+ else if (linux_source == SRC_PROC)
{
- ERROR ("tcpconns plugin: Neither /proc/net/tcp nor /proc/net/tcp6 "
- "coult be read.");
- return (-1);
+ int errors_num = 0;
+
+ if (conn_read_file ("/proc/net/tcp") != 0)
+ errors_num++;
+ if (conn_read_file ("/proc/net/tcp6") != 0)
+ errors_num++;
+
+ if (errors_num < 2)
+ status = 0;
+ else
+ status = ENOENT;
}
+ else /* if (linux_source == SRC_DUNNO) */
+ {
+ /* Try to use netlink for getting this data, it is _much_ faster on systems
+ * with a large amount of connections. */
+ status = conn_read_netlink ();
+ if (status == 0)
+ {
+ INFO ("tcpconns plugin: Reading from netlink succeeded. "
+ "Will use the netlink method from now on.");
+ linux_source = SRC_NETLINK;
+ }
+ else
+ {
+ INFO ("tcpconns plugin: Reading from netlink failed. "
+ "Will read from /proc from now on.");
+ linux_source = SRC_PROC;
+
+ /* return success here to avoid the "plugin failed" message. */
+ return (0);
+ }
+ }
+
+ if (status == 0)
+ conn_submit_all ();
+ else
+ return (status);
return (0);
} /* int conn_read */
static int conn_read (void)
{
struct inpcbtable table;
+#if !defined(__OpenBSD__) && (defined(__NetBSD_Version__) && __NetBSD_Version__ <= 699002700)
struct inpcb *head;
+#endif
struct inpcb *next;
struct inpcb inpcb;
struct tcpcb tcpcb;
if (status != 0)
return (-1);
+#if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
+ /* inpt_queue is a TAILQ on OpenBSD */
+ /* Get the first pcb */
+ next = (struct inpcb *)TAILQ_FIRST (&table.inpt_queue);
+ while (next)
+#else
/* Get the `head' pcb */
head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
/* Get the first pcb */
next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
while (next != head)
+#endif
{
/* Read the pcb pointed to by `next' into `inpcb' */
kread ((u_long) next, &inpcb, sizeof (inpcb));
/* Advance `next' */
+#if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
+ /* inpt_queue is a TAILQ on OpenBSD */
+ next = (struct inpcb *)TAILQ_NEXT (&inpcb, inp_queue);
+#else
next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
+#endif
/* Ignore sockets, that are not connected. */
#ifdef __NetBSD__
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