zebra/if_proc.c

   1 /* Interface name and statistics get function using proc file system
   2  * Copyright (C) 1999 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra 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
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "if.h"
  25 #include "prefix.h"
  26 #include "log.h"
  27
  28 #include "zebra/ioctl.h"
  29 #include "zebra/connected.h"
  30 #include "zebra/interface.h"
  31
  32 /* Proc filesystem one line buffer. */
  33 #define PROCBUFSIZ                  1024
  34
  35 /* Path to device proc file system. */
  36 #ifndef _PATH_PROC_NET_DEV
  37 #define _PATH_PROC_NET_DEV        "/proc/net/dev"
  38 #endif /* _PATH_PROC_NET_DEV */
  39
  40 /* Return statistics data pointer. */
  41 static char *
  42 interface_name_cut (char *buf, char **name)
  43 {
  44   char *stat;
  45
  46   /* Skip white space.  Line will include header spaces. */
  47   while (*buf == ' ')
  48     buf++;
  49   *name = buf;
  50
  51   /* Cut interface name. */
  52   stat = strrchr (buf, ':');
  53   *stat++ = '\0';
  54
  55   return stat;
  56 }
  57
  58 /* Fetch each statistics field. */
  59 static int
  60 ifstat_dev_fields (int version, char *buf, struct interface *ifp)
  61 {
  62   switch (version)
  63     {
  64     case 3:
  65       sscanf(buf,
  66              "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld",
  67              &ifp->stats.rx_bytes,
  68              &ifp->stats.rx_packets,
  69              &ifp->stats.rx_errors,
  70              &ifp->stats.rx_dropped,
  71              &ifp->stats.rx_fifo_errors,
  72              &ifp->stats.rx_frame_errors,
  73              &ifp->stats.rx_compressed,
  74              &ifp->stats.rx_multicast,
  75
  76              &ifp->stats.tx_bytes,
  77              &ifp->stats.tx_packets,
  78              &ifp->stats.tx_errors,
  79              &ifp->stats.tx_dropped,
  80              &ifp->stats.tx_fifo_errors,
  81              &ifp->stats.collisions,
  82              &ifp->stats.tx_carrier_errors,
  83              &ifp->stats.tx_compressed);
  84       break;
  85     case 2:
  86       sscanf(buf, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld",
  87              &ifp->stats.rx_bytes,
  88              &ifp->stats.rx_packets,
  89              &ifp->stats.rx_errors,
  90              &ifp->stats.rx_dropped,
  91              &ifp->stats.rx_fifo_errors,
  92              &ifp->stats.rx_frame_errors,
  93
  94              &ifp->stats.tx_bytes,
  95              &ifp->stats.tx_packets,
  96              &ifp->stats.tx_errors,
  97              &ifp->stats.tx_dropped,
  98              &ifp->stats.tx_fifo_errors,
  99              &ifp->stats.collisions,
 100              &ifp->stats.tx_carrier_errors);
 101       ifp->stats.rx_multicast = 0;
 102       break;
 103     case 1:
 104       sscanf(buf, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld",
 105              &ifp->stats.rx_packets,
 106              &ifp->stats.rx_errors,
 107              &ifp->stats.rx_dropped,
 108              &ifp->stats.rx_fifo_errors,
 109              &ifp->stats.rx_frame_errors,
 110
 111              &ifp->stats.tx_packets,
 112              &ifp->stats.tx_errors,
 113              &ifp->stats.tx_dropped,
 114              &ifp->stats.tx_fifo_errors,
 115              &ifp->stats.collisions,
 116              &ifp->stats.tx_carrier_errors);
 117       ifp->stats.rx_bytes = 0;
 118       ifp->stats.tx_bytes = 0;
 119       ifp->stats.rx_multicast = 0;
 120       break;
 121     }
 122   return 0;
 123 }
 124
 125 /* Update interface's statistics. */
 126 int
 127 ifstat_update_proc ()
 128 {
 129   FILE *fp;
 130   char buf[PROCBUFSIZ];
 131   int version;
 132   struct interface *ifp;
 133   char *stat;
 134   char *name;
 135
 136   /* Open /proc/net/dev. */
 137   fp = fopen (_PATH_PROC_NET_DEV, "r");
 138   if (fp == NULL)
 139     {
 140       zlog_warn ("Can't open proc file %s: %s",
 141                  _PATH_PROC_NET_DEV, safe_strerror (errno));
 142       return -1;
 143     }
 144
 145   /* Drop header lines. */
 146   fgets (buf, PROCBUFSIZ, fp);
 147   fgets (buf, PROCBUFSIZ, fp);
 148
 149   /* To detect proc format veresion, parse second line. */
 150   if (strstr (buf, "compressed"))
 151     version = 3;
 152   else if (strstr (buf, "bytes"))
 153     version = 2;
 154   else
 155     version = 1;
 156
 157   /* Update each interface's statistics. */
 158   while (fgets (buf, PROCBUFSIZ, fp) != NULL)
 159     {
 160       stat = interface_name_cut (buf, &name);
 161       ifp = if_get_by_name (name);
 162       ifstat_dev_fields (version, stat, ifp);
 163     }
 164   fclose(fp);
 165   return 0;
 166 }
 167
 168 /* Interface structure allocation by proc filesystem. */
 169 int
 170 interface_list_proc ()
 171 {
 172   FILE *fp;
 173   char buf[PROCBUFSIZ];
 174   struct interface *ifp;
 175   char *name;
 176
 177   /* Open /proc/net/dev. */
 178   fp = fopen (_PATH_PROC_NET_DEV, "r");
 179   if (fp == NULL)
 180     {
 181       zlog_warn ("Can't open proc file %s: %s",
 182                  _PATH_PROC_NET_DEV, safe_strerror (errno));
 183       return -1;
 184     }
 185
 186   /* Drop header lines. */
 187   fgets (buf, PROCBUFSIZ, fp);
 188   fgets (buf, PROCBUFSIZ, fp);
 189
 190   /* Only allocate interface structure.  Other jobs will be done in
 191      if_ioctl.c. */
 192   while (fgets (buf, PROCBUFSIZ, fp) != NULL)
 193     {
 194       interface_name_cut (buf, &name);
 195       ifp = if_get_by_name (name);
 196       if_add_update (ifp);
 197     }
 198   fclose(fp);
 199   return 0;
 200 }
 201 \f
 202 #if defined(HAVE_IPV6) && defined(HAVE_PROC_NET_IF_INET6)
 203
 204 #ifndef _PATH_PROC_NET_IF_INET6
 205 #define _PATH_PROC_NET_IF_INET6          "/proc/net/if_inet6"
 206 #endif /* _PATH_PROC_NET_IF_INET6 */
 207
 208 int
 209 ifaddr_proc_ipv6 ()
 210 {
 211   FILE *fp;
 212   char buf[PROCBUFSIZ];
 213   int n;
 214   char addr[33];
 215   char ifname[21];
 216   int ifindex, plen, scope, status;
 217   struct interface *ifp;
 218   struct prefix_ipv6 p;
 219
 220   /* Open proc file system. */
 221   fp = fopen (_PATH_PROC_NET_IF_INET6, "r");
 222   if (fp == NULL)
 223     {
 224       zlog_warn ("Can't open proc file %s: %s",
 225                  _PATH_PROC_NET_IF_INET6, safe_strerror (errno));
 226       return -1;
 227     }
 228
 229   /* Get interface's IPv6 address. */
 230   while (fgets (buf, PROCBUFSIZ, fp) != NULL)
 231     {
 232       n = sscanf (buf, "%32s %02x %02x %02x %02x %20s",
 233                   addr, &ifindex, &plen, &scope, &status, ifname);
 234       if (n != 6)
 235         continue;
 236
 237       ifp = if_get_by_name (ifname);
 238
 239       /* Fetch interface's IPv6 address. */
 240       str2in6_addr (addr, &p.prefix);
 241       p.prefixlen = plen;
 242
 243       connected_add_ipv6 (ifp, &p.prefix, p.prefixlen, NULL, ifname);
 244     }
 245   fclose (fp);
 246   return 0;
 247 }
 248 #endif /* HAVE_IPV6 && HAVE_PROC_NET_IF_INET6 */