107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
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/* $Id: linux.c,v 1.1 2003/08/24 20:01:48 bwalle Exp $ */
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/*****************************************************************************
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*
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* checkinterface()
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*
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* check if a given interface exists and is up.
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* return TRUE if found, FALSE if not
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*
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****************************************************************************/
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int checkinterface(void)
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{
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int interfacefound = FALSE;
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unsigned int i;
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struct if_nameindex *ifs;
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if ((ifs = if_nameindex()) == NULL)
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return FALSE;
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for (i = 0; ifs[i].if_index; i++)
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{
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if (strcmp(ifs[i].if_name, ifdata.if_name) == 0)
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{
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interfacefound = TRUE;
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break;
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}
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}
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return interfacefound;
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}
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/******************************************************************************
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*
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* get_stat()
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*
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* read the network statistics from /proc/net/dev (PATH_NET_DEV)
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* if the file is not open open it. fseek() to the beginning and parse
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* each line until we've found the right interface
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*
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* returns 0 if successful, 1 in case of error
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*
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*****************************************************************************/
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int get_stat(void)
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{
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static int opened = 0;
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char buffer[BUFSIZE];
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char *ptr;
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char *devname;
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int dump;
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int interfacefound;
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unsigned long rx_o, tx_o;
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if (opened != 1)
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{
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if ((proc_net_dev = fopen(PATH_NET_DEV, "r")) == NULL)
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{
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fprintf(stderr, "cannot open %s!\nnot running Linux?\n",
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PATH_NET_DEV);
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exit(1);
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}
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opened++;
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}
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/* backup old rx/tx values */
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rx_o = stats.rx_bytes; tx_o = stats.tx_bytes;
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/* do not parse the first two lines as they only contain static garbage */
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fseek(proc_net_dev, 0, SEEK_SET);
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fgets(buffer, BUFSIZ-1, proc_net_dev);
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fgets(buffer, BUFSIZ-1, proc_net_dev);
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interfacefound = 0;
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while (fgets(buffer, BUFSIZ-1, proc_net_dev) != NULL)
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{
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/* find the device name and substitute ':' with '\0' */
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ptr = buffer;
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while (*ptr == ' ')
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ptr++;
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devname = ptr;
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while (*ptr != ':')
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ptr++;
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*ptr = '\0';
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ptr++;
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if (!strcmp(devname, (char *) ifdata.if_name))
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{
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/* read stats and fill struct */
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sscanf(ptr, "%lg %lu %lu %d %d %d %d %d %lg %lu %lu %d %d %d %d %d",
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&stats.rx_bytes, &stats.rx_packets, &stats.rx_errors,
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&dump, &dump, &dump, &dump, &dump,
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&stats.tx_bytes, &stats.tx_packets, &stats.tx_errors,
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&dump, &dump, &dump, &dump, &dump);
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interfacefound = 1;
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continue; /* break, as we won't get any new information */
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}
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}
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if (interfacefound)
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{
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if (rx_o > stats.rx_bytes)
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stats.rx_over++;
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if (tx_o > stats.tx_bytes)
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stats.tx_over++;
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}
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return (interfacefound == 1)? 0 : 1;
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}
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