110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
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/* $Id: getifstats.c,v 1.9 2011/05/25 22:22:57 nanard Exp $ */
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/* MiniUPnP project
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* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
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* (c) 2006-2011 Thomas Bernard
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* This software is subject to the conditions detailed
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* in the LICENCE file provided within the distribution */
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#include <stdio.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <string.h>
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#include <time.h>
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#include "../config.h"
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#include "../getifstats.h"
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int
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getifstats(const char * ifname, struct ifdata * data)
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{
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FILE *f;
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char line[512];
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char * p;
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int i;
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int r = -1;
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char fname[64];
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#ifdef ENABLE_GETIFSTATS_CACHING
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static time_t cache_timestamp = 0;
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static struct ifdata cache_data;
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time_t current_time;
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#endif
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if(!data)
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return -1;
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data->baudrate = 4200000; /* that is the answer */
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data->opackets = 0;
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data->ipackets = 0;
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data->obytes = 0;
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data->ibytes = 0;
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if(!ifname || ifname[0]=='\0')
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return -1;
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#ifdef ENABLE_GETIFSTATS_CACHING
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current_time = time(NULL);
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if(current_time == ((time_t)-1)) {
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syslog(LOG_ERR, "getifstats() : time() error : %m");
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} else {
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if(current_time < cache_timestamp + GETIFSTATS_CACHING_DURATION) {
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/* return cached data */
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memcpy(data, &cache_data, sizeof(struct ifdata));
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return 0;
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}
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}
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#endif
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f = fopen("/proc/net/dev", "r");
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if(!f) {
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syslog(LOG_ERR, "getifstats() : cannot open /proc/net/dev : %m");
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return -1;
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}
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/* discard the two header lines */
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if(!fgets(line, sizeof(line), f) || !fgets(line, sizeof(line), f)) {
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syslog(LOG_ERR, "getifstats() : error reading /proc/net/dev : %m");
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}
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while(fgets(line, sizeof(line), f)) {
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p = line;
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while(*p==' ') p++;
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i = 0;
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while(ifname[i] == *p) {
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p++; i++;
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}
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/* TODO : how to handle aliases ? */
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if(ifname[i] || *p != ':')
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continue;
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p++;
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while(*p==' ') p++;
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data->ibytes = strtoul(p, &p, 0);
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while(*p==' ') p++;
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data->ipackets = strtoul(p, &p, 0);
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/* skip 6 columns */
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for(i=6; i>0 && *p!='\0'; i--) {
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while(*p==' ') p++;
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while(*p!=' ' && *p) p++;
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}
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while(*p==' ') p++;
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data->obytes = strtoul(p, &p, 0);
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while(*p==' ') p++;
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data->opackets = strtoul(p, &p, 0);
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r = 0;
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break;
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}
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fclose(f);
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/* get interface speed */
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snprintf(fname, sizeof(fname), "/sys/class/net/%s/speed", ifname);
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f = fopen(fname, "r");
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if(f) {
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if(fgets(line, sizeof(line), f)) {
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data->baudrate = 1000000*atoi(line);
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}
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fclose(f);
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} else {
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syslog(LOG_WARNING, "cannot read %s file : %m", fname);
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}
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#ifdef ENABLE_GETIFSTATS_CACHING
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if(r==0 && current_time!=((time_t)-1)) {
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/* cache the new data */
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cache_timestamp = current_time;
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memcpy(&cache_data, data, sizeof(struct ifdata));
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}
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#endif
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return r;
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}
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