Added basic collectd-exec example.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

4 files changed, 350 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index 9df1ac1cf..56e0c00ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # c executables
 /nDPId
 /nDPIsrvd
+/examples/c-collectd/c-collectd
 /examples/c-captured/c-captured
 /examples/c-json-stdout/c-json-stdout
 
diff --git a/Makefile b/Makefile
index 452e5105f..61ea2a6e9 100644
--- a/Makefile
+++ b/Makefile
@@ -68,7 +68,7 @@ endif
 
 all: help nDPId nDPIsrvd examples
 
-examples: examples/c-captured/c-captured examples/c-json-stdout/c-json-stdout examples/go-dashboard/go-dashboard
+examples: examples/c-collectd/c-collectd examples/c-captured/c-captured examples/c-json-stdout/c-json-stdout examples/go-dashboard/go-dashboard
 
 nDPId: nDPId.c utils.c
 	$(CC) $(PROJECT_CFLAGS) $(CFLAGS) $(PC_CFLAGS) $^ -o $@ $(LDFLAGS) $(PC_LDFLAGS) $(STATIC_NDPI_LIB) $(LIBS)
@@ -76,6 +76,9 @@ nDPId: nDPId.c utils.c
 nDPIsrvd: nDPIsrvd.c utils.c
 	$(CC) $(PROJECT_CFLAGS) $(CFLAGS) $(DEPS_CFLAGS) $^ -o $@ $(LDFLAGS) $(STATIC_NDPI_LIB) $(LIBS)
 
+examples/c-collectd/c-collectd: examples/c-collectd/c-collectd.c
+	$(CC) $(PROJECT_CFLAGS) $(CFLAGS) $(DEPS_CFLAGS) $@.c -o $@ $(LDFLAGS) $(LIBS)
+
 examples/c-captured/c-captured: examples/c-captured/c-captured.c utils.c
 	$(CC) $(PROJECT_CFLAGS) $(CFLAGS) $(DEPS_CFLAGS) $^ -o $@ $(LDFLAGS) $(LIBS)
 
@@ -101,7 +104,7 @@ ifneq ($(GOCC),)
 endif
 
 clean:
-	$(RM) -f nDPId nDPIsrvd examples/c-captured/c-captured examples/c-json-stdout/c-json-stdout examples/go-dashboard/go-dashboard
+	$(RM) -f nDPId nDPIsrvd examples/c-collectd/c-collectd examples/c-captured/c-captured examples/c-json-stdout/c-json-stdout examples/go-dashboard/go-dashboard
 
 help:
 	@echo '------------------------------------'
diff --git a/examples/c-collectd/c-collectd.c b/examples/c-collectd/c-collectd.c
new file mode 100644
index 000000000..c4f6686ad
--- /dev/null
+++ b/examples/c-collectd/c-collectd.c
@@ -0,0 +1,339 @@
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <sys/epoll.h>
+#include <sys/timerfd.h>
+#include <unistd.h>
+
+#include "nDPIsrvd.h"
+
+static struct nDPIsrvd_socket * sock = NULL;
+static int main_thread_shutdown = 0;
+static int collectd_timerfd = -1;
+
+static char * serv_optarg = NULL;
+static char * collectd_hostname = NULL;
+static char * collectd_interval = NULL;
+static nDPIsrvd_ull collectd_interval_ull = 0uL;
+
+static struct {
+    uint64_t flow_new_count;
+    uint64_t flow_end_count;
+    uint64_t flow_idle_count;
+    uint64_t flow_guessed_count;
+    uint64_t flow_detected_count;
+    uint64_t flow_detection_update_count;
+    uint64_t flow_not_detected_count;
+} collectd_statistics = {};
+
+static int set_collectd_timer(void)
+{
+    const time_t interval = collectd_interval_ull * 1000;
+    struct itimerspec its;
+    its.it_value.tv_sec = interval / 1000;
+    its.it_value.tv_nsec = (interval % 1000) * 1000000;
+    its.it_interval.tv_nsec = 0;
+    its.it_interval.tv_sec = 0;
+
+    errno = 0;
+    return timerfd_settime(collectd_timerfd, 0, &its, NULL);
+}
+
+static int create_collectd_timer(void)
+{
+    collectd_timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+    if (collectd_timerfd < 0)
+    {
+        return 1;
+    }
+
+    return set_collectd_timer();
+}
+
+static void sighandler(int signum)
+{
+    syslog(LOG_DAEMON | LOG_NOTICE, "Received SIGNAL %d", signum);
+
+    if (main_thread_shutdown == 0)
+    {
+        syslog(LOG_DAEMON | LOG_NOTICE, "Shutting down ..");
+        main_thread_shutdown = 1;
+    }
+    else
+    {
+        syslog(LOG_DAEMON | LOG_NOTICE, "Reader threads are already shutting down, please be patient.");
+    }
+}
+
+static int parse_options(int argc, char ** argv)
+{
+    int opt;
+
+    static char const usage[] =
+        "Usage: %s "
+        "[-s host] [-i interval]\n\n"
+        "\t-s\tDestination where nDPIsrvd is listening on.\n"
+        "\t-c\tCollectd hostname.\n"
+        "\t  \tThis value defaults to the environment variable COLLECTD_HOSTNAME.\n"
+        "\t-i\tInterval between print statistics to stdout.\n"
+        "\t  \tThis value defaults to the environment variable COLLECTD_INTERVAL.\n";
+
+    while ((opt = getopt(argc, argv, "hs:c:i:")) != -1)
+    {
+        switch (opt)
+        {
+            case 's':
+                free(serv_optarg);
+                serv_optarg = strdup(optarg);
+                break;
+            case 'c':
+                free(collectd_hostname);
+                collectd_hostname =  strdup(optarg);
+                break;
+            case 'i':
+                free(collectd_interval);
+                collectd_interval = strdup(optarg);
+                break;
+            default:
+                fprintf(stderr, usage, argv[0]);
+                return 1;
+        }
+    }
+
+    if (serv_optarg == NULL)
+    {
+        serv_optarg = strdup(DISTRIBUTOR_UNIX_SOCKET);
+    }
+
+    if (collectd_hostname == NULL)
+    {
+        collectd_hostname = getenv("COLLECTD_HOSTNAME");
+        if (collectd_hostname == NULL)
+        {
+            collectd_hostname = strdup("localhost");
+        }
+    }
+
+    if (collectd_interval == NULL)
+    {
+        collectd_interval = getenv("COLLECTD_INTERVAL");
+        if (collectd_interval == NULL)
+        {
+            collectd_interval = strdup("60");
+        }
+    }
+
+    if (str_value_to_ull(collectd_interval, &collectd_interval_ull) != CONVERSION_OK)
+    {
+        fprintf(stderr, "%s: Collectd interval `%s' is not a valid number\n", argv[0], collectd_interval);
+        return 1;
+    }
+
+    if (nDPIsrvd_setup_address(&sock->address, serv_optarg) != 0)
+    {
+        fprintf(stderr, "%s: Could not parse address `%s'\n", argv[0], serv_optarg);
+        return 1;
+    }
+
+    if (optind < argc)
+    {
+        fprintf(stderr, "Unexpected argument after options\n\n");
+        fprintf(stderr, usage, argv[0]);
+        return 1;
+    }
+
+    return 0;
+}
+
+#define COLLECTD_PUTVAL_N_FORMAT(name) "PUTVAL %s/nDPId/" #name " interval=%llu N:%llu\n"
+#define COLLECTD_PUTVAL_N(value) collectd_hostname, collectd_interval_ull, (unsigned long long int)collectd_statistics.value
+static void print_collectd_exec_output(void)
+{
+    printf(COLLECTD_PUTVAL_N_FORMAT(flow_new_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_end_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_idle_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_guessed_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_detected_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_detection_update_count)
+           COLLECTD_PUTVAL_N_FORMAT(flow_not_detected_count),
+
+           COLLECTD_PUTVAL_N(flow_new_count),
+           COLLECTD_PUTVAL_N(flow_end_count),
+           COLLECTD_PUTVAL_N(flow_idle_count),
+           COLLECTD_PUTVAL_N(flow_guessed_count),
+           COLLECTD_PUTVAL_N(flow_detected_count),
+           COLLECTD_PUTVAL_N(flow_detection_update_count),
+           COLLECTD_PUTVAL_N(flow_not_detected_count));
+
+    memset(&collectd_statistics, 0, sizeof(collectd_statistics));
+}
+
+static int mainloop(int epollfd)
+{
+    struct epoll_event events[32];
+    size_t const events_size = sizeof(events) / sizeof(events[0]);
+
+    while (main_thread_shutdown == 0)
+    {
+        int nready = epoll_wait(epollfd, events, events_size, -1);
+
+        for (int i = 0; i < nready; i++)
+        {
+            if (events[i].events & EPOLLERR)
+            {
+                syslog(LOG_DAEMON | LOG_ERR, "Epoll event error: %s", (errno != 0 ? strerror(errno) : "EPOLLERR"));
+                break;
+            }
+
+            if (events[i].data.fd == collectd_timerfd)
+            {
+                uint64_t expirations;
+
+                errno = 0;
+                if (read(collectd_timerfd, &expirations, sizeof(expirations)) != sizeof(expirations))
+                {
+                    syslog(LOG_DAEMON | LOG_ERR, "Could not read timer expirations: %s", strerror(errno));
+                    return 1;
+                }
+                if (set_collectd_timer() != 0)
+                {
+                    syslog(LOG_DAEMON | LOG_ERR, "Could not set timer: %s", strerror(errno));
+                    return 1;
+                }
+
+                print_collectd_exec_output();
+            }
+            else if (events[i].data.fd == sock->fd)
+            {
+                errno = 0;
+                enum nDPIsrvd_read_return read_ret = nDPIsrvd_read(sock);
+                if (read_ret != READ_OK)
+                {
+                    syslog(LOG_DAEMON | LOG_ERR, "nDPIsrvd read failed with: %s", nDPIsrvd_enum_to_string(read_ret));
+                    return 1;
+                }
+
+                enum nDPIsrvd_parse_return parse_ret = nDPIsrvd_parse(sock);
+                if (parse_ret != PARSE_OK)
+                {
+                    syslog(LOG_DAEMON | LOG_ERR, "nDPIsrvd parse failed with: %s", nDPIsrvd_enum_to_string(parse_ret));
+                    return 1;
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+static enum nDPIsrvd_callback_return captured_json_callback(struct nDPIsrvd_socket * const sock,
+                                                            struct nDPIsrvd_flow * const flow)
+{
+    (void)sock;
+    (void)flow;
+
+    struct nDPIsrvd_json_token const * const flow_event_name = TOKEN_GET_SZ(sock, "flow_event_name");
+
+    if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "new") != 0)
+    {
+        collectd_statistics.flow_new_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "end") != 0)
+    {
+        collectd_statistics.flow_end_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "idle") != 0)
+    {
+        collectd_statistics.flow_idle_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "guessed") != 0)
+    {
+        collectd_statistics.flow_guessed_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "detected") != 0)
+    {
+        collectd_statistics.flow_detected_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "detection-update") != 0)
+    {
+        collectd_statistics.flow_detection_update_count++;
+    } else if (TOKEN_VALUE_EQUALS_SZ(flow_event_name, "not-detected") != 0)
+    {
+        collectd_statistics.flow_not_detected_count++;
+    }
+
+    return CALLBACK_OK;
+}
+
+int main(int argc, char ** argv)
+{
+    int retval = 1;
+
+    sock = nDPIsrvd_init(0, 0, captured_json_callback, NULL);
+    if (sock == NULL)
+    {
+        fprintf(stderr, "%s: nDPIsrvd socket memory allocation failed!\n", argv[0]);
+        return 1;
+    }
+
+    if (parse_options(argc, argv) != 0)
+    {
+        return 1;
+    }
+
+    printf("Recv buffer size: %u\n", NETWORK_BUFFER_MAX_SIZE);
+    printf("Connecting to `%s'..\n", serv_optarg);
+
+    enum nDPIsrvd_connect_return connect_ret = nDPIsrvd_connect(sock);
+    if (connect_ret != CONNECT_OK)
+    {
+        fprintf(stderr, "%s: nDPIsrvd socket connect to %s failed!\n", argv[0], serv_optarg);
+        nDPIsrvd_free(&sock);
+        return 1;
+    }
+
+    signal(SIGINT, sighandler);
+    signal(SIGTERM, sighandler);
+    signal(SIGPIPE, SIG_IGN);
+
+    openlog("nDPIsrvd-collectd", LOG_CONS, LOG_DAEMON);
+
+    int epollfd = epoll_create1(0);
+    if (epollfd < 0)
+    {
+        syslog(LOG_DAEMON | LOG_ERR, "Error creating epoll: %s", strerror(errno));
+        return 1;
+    }
+
+    if (create_collectd_timer() != 0)
+    {
+        syslog(LOG_DAEMON | LOG_ERR, "Error creating timer: %s", strerror(errno));
+        return 1;
+    }
+
+    {
+        struct epoll_event timer_event = {.data.fd = collectd_timerfd, .events = EPOLLIN};
+        if (epoll_ctl(epollfd, EPOLL_CTL_ADD, collectd_timerfd, &timer_event) < 0)
+        {
+            syslog(LOG_DAEMON | LOG_ERR, "Error adding JSON fd to epoll: %s", strerror(errno));
+            return 1;
+        }
+    }
+
+    {
+        struct epoll_event socket_event = {.data.fd = sock->fd, .events = EPOLLIN};
+        if (epoll_ctl(epollfd, EPOLL_CTL_ADD, sock->fd, &socket_event) < 0)
+        {
+            syslog(LOG_DAEMON | LOG_ERR, "Error adding nDPIsrvd socket fd to epoll: %s", strerror(errno));
+            return 1;
+        }
+    }
+
+    syslog(LOG_DAEMON | LOG_NOTICE, "%s", "Initialization succeeded.");
+    retval = mainloop(epollfd);
+
+    nDPIsrvd_free(&sock);
+    close(collectd_timerfd);
+    close(epollfd);
+    closelog();
+
+    return retval;
+}
diff --git a/examples/c-collectd/plugin_nDPIsrvd.conf b/examples/c-collectd/plugin_nDPIsrvd.conf
new file mode 100644
index 000000000..0177e89a8
--- /dev/null
+++ b/examples/c-collectd/plugin_nDPIsrvd.conf
@@ -0,0 +1,5 @@
+# nDPIsrvd collectd config file
+LoadPlugin exec
+<Plugin exec>
+  Exec "ndpi" "/usr/bin/nDPIsrvd-collectd"
+</Plugin>