src/plugin_nfacct.c

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