src/plugin_nfacct.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #ifdef INTERNAL_PLUGIN_NFACCT
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <sys/types.h>
   9 #include <dirent.h>
  10 #include <sys/stat.h>
  11 #include <fcntl.h>
  12 #include <unistd.h>
  13 #include <time.h>
  14 #include <errno.h>
  15
  16 #include <libmnl/libmnl.h>
  17 #include <libnetfilter_acct/libnetfilter_acct.h>
  18
  19 #include "global_statistics.h"
  20 #include "common.h"
  21 #include "appconfig.h"
  22 #include "log.h"
  23 #include "rrd.h"
  24 #include "plugin_proc.h"
  25
  26 struct mynfacct {
  27         const char *name;
  28         uint64_t pkts;
  29         uint64_t bytes;
  30         struct nfacct *nfacct;
  31 };
  32
  33 struct nfacct_list {
  34         int size;
  35         int len;
  36         struct mynfacct data[];
  37 } *nfacct_list = NULL;
  38
  39 static int nfacct_callback(const struct nlmsghdr *nlh, void *data) {
  40         if(data) {};
  41
  42         if(!nfacct_list || nfacct_list->len == nfacct_list->size) {
  43                 int size = (nfacct_list) ? nfacct_list->size : 0;
  44                 int len = (nfacct_list) ? nfacct_list->len : 0;
  45                 size++;
  46
  47                 info("nfacct.plugin: increasing nfacct_list to size %d", size);
  48
  49                 nfacct_list = realloc(nfacct_list, sizeof(struct nfacct_list) + (sizeof(struct mynfacct) * size));
  50                 if(!nfacct_list) {
  51                         error("nfacct.plugin: cannot allocate nfacct_list.");
  52                         return MNL_CB_OK;
  53                 }
  54
  55                 nfacct_list->data[len].nfacct = nfacct_alloc();
  56                 if(!nfacct_list->data[size - 1].nfacct) {
  57                         error("nfacct.plugin: nfacct_alloc() failed.");
  58                         free(nfacct_list);
  59                         nfacct_list = NULL;
  60                         return MNL_CB_OK;
  61                 }
  62
  63                 nfacct_list->size = size;
  64                 nfacct_list->len = len;
  65         }
  66
  67         if(nfacct_nlmsg_parse_payload(nlh, nfacct_list->data[nfacct_list->len].nfacct) < 0) {
  68                 error("nfacct.plugin: nfacct_nlmsg_parse_payload() failed.");
  69                 return MNL_CB_OK;
  70         }
  71
  72         nfacct_list->data[nfacct_list->len].name  = nfacct_attr_get_str(nfacct_list->data[nfacct_list->len].nfacct, NFACCT_ATTR_NAME);
  73         nfacct_list->data[nfacct_list->len].pkts  = nfacct_attr_get_u64(nfacct_list->data[nfacct_list->len].nfacct, NFACCT_ATTR_PKTS);
  74         nfacct_list->data[nfacct_list->len].bytes = nfacct_attr_get_u64(nfacct_list->data[nfacct_list->len].nfacct, NFACCT_ATTR_BYTES);
  75
  76         nfacct_list->len++;
  77         return MNL_CB_OK;
  78 }
  79
  80 void *nfacct_main(void *ptr) {
  81         if(ptr) { ; }
  82
  83         info("NFACCT thread created with task id %d", gettid());
  84
  85         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  86                 error("nfacct.plugin: Cannot set pthread cancel type to DEFERRED.");
  87
  88         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  89                 error("nfacct.plugin: Cannot set pthread cancel state to ENABLE.");
  90
  91         char buf[MNL_SOCKET_BUFFER_SIZE];
  92         struct mnl_socket *nl = NULL;
  93         struct nlmsghdr *nlh = NULL;
  94         unsigned int seq = 0, portid = 0;
  95
  96         seq = time(NULL) - 1;
  97
  98         nl  = mnl_socket_open(NETLINK_NETFILTER);
  99         if(!nl) {
 100                 error("nfacct.plugin: mnl_socket_open() failed");
 101                 return NULL;
 102         }
 103
 104         if(mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
 105                 mnl_socket_close(nl);
 106                 error("nfacct.plugin: mnl_socket_bind() failed");
 107                 return NULL;
 108         }
 109         portid = mnl_socket_get_portid(nl);
 110
 111         // ------------------------------------------------------------------------
 112
 113         struct timeval last, now;
 114         unsigned long long usec = 0, susec = 0;
 115         RRDSET *st = NULL;
 116
 117         gettimeofday(&last, NULL);
 118
 119         // ------------------------------------------------------------------------
 120
 121         while(1) {
 122                 seq++;
 123
 124                 nlh = nfacct_nlmsg_build_hdr(buf, NFNL_MSG_ACCT_GET, NLM_F_DUMP, seq);
 125                 if(!nlh) {
 126                         mnl_socket_close(nl);
 127                         error("nfacct.plugin: nfacct_nlmsg_build_hdr() failed");
 128                         return NULL;
 129                 }
 130
 131                 if(mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
 132                         error("nfacct.plugin: mnl_socket_send");
 133                         return NULL;
 134                 }
 135
 136                 if(nfacct_list) nfacct_list->len = 0;
 137
 138                 int ret;
 139                 while((ret = mnl_socket_recvfrom(nl, buf, sizeof(buf))) > 0) {
 140                         if((ret = mnl_cb_run(buf, ret, seq, portid, nfacct_callback, NULL)) <= 0) break;
 141                 }
 142
 143                 if (ret == -1) {
 144                         error("nfacct.plugin: error communicating with kernel.");
 145                         return NULL;
 146                 }
 147
 148                 // --------------------------------------------------------------------
 149
 150                 gettimeofday(&now, NULL);
 151                 usec = usecdiff(&now, &last) - susec;
 152                 debug(D_NFACCT_LOOP, "nfacct.plugin: last loop took %llu usec (worked for %llu, sleeped for %llu).", usec + susec, usec, susec);
 153
 154                 if(usec < (rrd_update_every * 1000000ULL / 2ULL)) susec = (rrd_update_every * 1000000ULL) - usec;
 155                 else susec = rrd_update_every * 1000000ULL / 2ULL;
 156
 157
 158                 // --------------------------------------------------------------------
 159
 160                 if(nfacct_list && nfacct_list->len) {
 161                         int i;
 162
 163                         st = rrdset_find_bytype("nfacct", "packets");
 164                         if(!st) {
 165                                 st = rrdset_create("nfacct", "packets", NULL, "netfilter", "Netfilter Accounting Packets", "packets/s", 1006, rrd_update_every, RRDSET_TYPE_STACKED);
 166
 167                                 for(i = 0; i < nfacct_list->len ; i++)
 168                                         rrddim_add(st, nfacct_list->data[i].name, NULL, 1, rrd_update_every, RRDDIM_INCREMENTAL);
 169                         }
 170                         else rrdset_next(st);
 171
 172                         for(i = 0; i < nfacct_list->len ; i++) {
 173                                 RRDDIM *rd = rrddim_find(st, nfacct_list->data[i].name);
 174
 175                                 if(!rd) rd = rrddim_add(st, nfacct_list->data[i].name, NULL, 1, rrd_update_every, RRDDIM_INCREMENTAL);
 176                                 if(rd) rrddim_set_by_pointer(st, rd, nfacct_list->data[i].pkts);
 177                         }
 178
 179                         rrdset_done(st);
 180
 181                         // ----------------------------------------------------------------
 182
 183                         st = rrdset_find_bytype("nfacct", "bytes");
 184                         if(!st) {
 185                                 st = rrdset_create("nfacct", "bytes", NULL, "netfilter", "Netfilter Accounting Bandwidth", "kilobytes/s", 1007, rrd_update_every, RRDSET_TYPE_STACKED);
 186
 187                                 for(i = 0; i < nfacct_list->len ; i++)
 188                                         rrddim_add(st, nfacct_list->data[i].name, NULL, 1, 1000 * rrd_update_every, RRDDIM_INCREMENTAL);
 189                         }
 190                         else rrdset_next(st);
 191
 192                         for(i = 0; i < nfacct_list->len ; i++) {
 193                                 RRDDIM *rd = rrddim_find(st, nfacct_list->data[i].name);
 194
 195                                 if(!rd) rd = rrddim_add(st, nfacct_list->data[i].name, NULL, 1, 1000 * rrd_update_every, RRDDIM_INCREMENTAL);
 196                                 if(rd) rrddim_set_by_pointer(st, rd, nfacct_list->data[i].bytes);
 197                         }
 198
 199                         rrdset_done(st);
 200                 }
 201
 202                 // --------------------------------------------------------------------
 203
 204                 usleep(susec);
 205
 206                 // copy current to last
 207                 bcopy(&now, &last, sizeof(struct timeval));
 208         }
 209
 210         mnl_socket_close(nl);
 211         return NULL;
 212 }
 213 #endif