Line data    Source code

       1             : /*
       2             :  * Logging - Filtered file log target
       3             :  * Copyright (C) 2019 Cumulus Networks, Inc.
       4             :  *                    Stephen Worley
       5             :  *
       6             :  * This program is free software; you can redistribute it and/or modify it
       7             :  * under the terms of the GNU General Public License as published by the Free
       8             :  * Software Foundation; either version 2 of the License, or (at your option)
       9             :  * any later version.
      10             :  *
      11             :  * This program is distributed in the hope that it will be useful, but WITHOUT
      12             :  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13             :  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
      14             :  * more details.
      15             :  *
      16             :  * You should have received a copy of the GNU General Public License along
      17             :  * with this program; see the file COPYING; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include <zebra.h>
      22             : 
      23             : #include "frr_pthread.h"
      24             : #include "log.h"
      25             : 
      26             : static pthread_mutex_t logfilterlock = PTHREAD_MUTEX_INITIALIZER;
      27             : static char zlog_filters[ZLOG_FILTERS_MAX][ZLOG_FILTER_LENGTH_MAX + 1];
      28             : static uint8_t zlog_filter_count;
      29             : 
      30             : /*
      31             :  * look for a match on the filter in the current filters,
      32             :  * logfilterlock must be held
      33             :  */
      34           0 : static int zlog_filter_lookup(const char *lookup)
      35             : {
      36           0 :         for (int i = 0; i < zlog_filter_count; i++) {
      37           0 :                 if (strncmp(lookup, zlog_filters[i], sizeof(zlog_filters[0]))
      38             :                     == 0)
      39           0 :                         return i;
      40             :         }
      41             :         return -1;
      42             : }
      43             : 
      44           0 : void zlog_filter_clear(void)
      45             : {
      46           0 :         frr_with_mutex (&logfilterlock) {
      47           0 :                 zlog_filter_count = 0;
      48             :         }
      49           0 : }
      50             : 
      51           0 : int zlog_filter_add(const char *filter)
      52             : {
      53           0 :         frr_with_mutex (&logfilterlock) {
      54           0 :                 if (zlog_filter_count >= ZLOG_FILTERS_MAX)
      55             :                         return 1;
      56             : 
      57           0 :                 if (zlog_filter_lookup(filter) != -1)
      58             :                         /* Filter already present */
      59             :                         return -1;
      60             : 
      61           0 :                 strlcpy(zlog_filters[zlog_filter_count], filter,
      62             :                         sizeof(zlog_filters[0]));
      63             : 
      64           0 :                 if (zlog_filters[zlog_filter_count][0] == '\0')
      65             :                         /* Filter was either empty or didn't get copied
      66             :                          * correctly
      67             :                          */
      68             :                         return -1;
      69             : 
      70           0 :                 zlog_filter_count++;
      71             :         }
      72           0 :         return 0;
      73             : }
      74             : 
      75           0 : int zlog_filter_del(const char *filter)
      76             : {
      77           0 :         frr_with_mutex (&logfilterlock) {
      78           0 :                 int found_idx = zlog_filter_lookup(filter);
      79           0 :                 int last_idx = zlog_filter_count - 1;
      80             : 
      81           0 :                 if (found_idx == -1)
      82             :                         /* Didn't find the filter to delete */
      83           0 :                         return -1;
      84             : 
      85             :                 /* Adjust the filter array */
      86           0 :                 memmove(zlog_filters[found_idx], zlog_filters[found_idx + 1],
      87           0 :                         (last_idx - found_idx) * sizeof(zlog_filters[0]));
      88             : 
      89           0 :                 zlog_filter_count--;
      90             :         }
      91           0 :         return 0;
      92             : }
      93             : 
      94             : /* Dump all filters to buffer, delimited by new line */
      95           0 : int zlog_filter_dump(char *buf, size_t max_size)
      96             : {
      97           0 :         int len = 0;
      98             : 
      99           0 :         frr_with_mutex (&logfilterlock) {
     100           0 :                 for (int i = 0; i < zlog_filter_count; i++) {
     101           0 :                         int ret;
     102             : 
     103           0 :                         ret = snprintf(buf + len, max_size - len, " %s\n",
     104           0 :                                        zlog_filters[i]);
     105           0 :                         len += ret;
     106           0 :                         if ((ret < 0) || ((size_t)len >= max_size))
     107           0 :                                 return -1;
     108             :                 }
     109             :         }
     110             : 
     111           0 :         return len;
     112             : }
     113             : 
     114           0 : static int search_buf(const char *buf, size_t len)
     115             : {
     116           0 :         char *found = NULL;
     117             : 
     118           0 :         frr_with_mutex (&logfilterlock) {
     119           0 :                 for (int i = 0; i < zlog_filter_count; i++) {
     120           0 :                         found = memmem(buf, len, zlog_filters[i],
     121           0 :                                        strlen(zlog_filters[i]));
     122           0 :                         if (found != NULL)
     123           0 :                                 return 0;
     124             :                 }
     125             :         }
     126             : 
     127           0 :         return -1;
     128             : }
     129             : 
     130           0 : static void zlog_filterfile_fd(struct zlog_target *zt, struct zlog_msg *msgs[],
     131             :                                size_t nmsgs)
     132           0 : {
     133           0 :         struct zlog_msg *msgfilt[nmsgs];
     134           0 :         size_t i, o = 0;
     135           0 :         const char *text;
     136           0 :         size_t text_len;
     137             : 
     138           0 :         for (i = 0; i < nmsgs; i++) {
     139           0 :                 if (zlog_msg_prio(msgs[i]) >= LOG_DEBUG) {
     140           0 :                         text = zlog_msg_text(msgs[i], &text_len);
     141           0 :                         if (search_buf(text, text_len) < 0)
     142           0 :                                 continue;
     143             :                 }
     144           0 :                 msgfilt[o++] = msgs[i];
     145             :         }
     146             : 
     147           0 :         if (o)
     148           0 :                 zlog_fd(zt, msgfilt, o);
     149           0 : }
     150             : 
     151         190 : void zlog_filterfile_init(struct zlog_cfg_filterfile *zcf)
     152             : {
     153         190 :         zlog_file_init(&zcf->parent);
     154         190 :         zcf->parent.zlog_wrap = zlog_filterfile_fd;
     155         190 : }
     156             : 
     157           0 : void zlog_filterfile_fini(struct zlog_cfg_filterfile *zcf)
     158             : {
     159           0 :         zlog_file_fini(&zcf->parent);
     160           0 : }