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1.8

    1: /* $Id: getifstats.c,v 1.1.1.3 2013/07/22 00:32:35 misho Exp $ */
    2: /* MiniUPnP project
    3:  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
    4:  * (c) 2006-2012 Thomas Bernard
    5:  * This software is subject to the conditions detailed
    6:  * in the LICENCE file provided within the distribution */
    7: 
    8: #include <stdio.h>
    9: #include <stdlib.h>
   10: #include <syslog.h>
   11: #include <string.h>
   12: #include <time.h>
   13: 
   14: #include "../config.h"
   15: #include "../getifstats.h"
   16: 
   17: int
   18: getifstats(const char * ifname, struct ifdata * data)
   19: {
   20: 	FILE *f;
   21: 	char line[512];
   22: 	char * p;
   23: 	int i;
   24: 	int r = -1;
   25: 	char fname[64];
   26: #ifdef ENABLE_GETIFSTATS_CACHING
   27: 	static time_t cache_timestamp = 0;
   28: 	static struct ifdata cache_data;
   29: 	time_t current_time;
   30: #endif
   31: 	if(!data)
   32: 		return -1;
   33: 	data->baudrate = 4200000;	/* that is the answer */
   34: 	data->opackets = 0;
   35: 	data->ipackets = 0;
   36: 	data->obytes = 0;
   37: 	data->ibytes = 0;
   38: 	if(!ifname || ifname[0]=='\0')
   39: 		return -1;
   40: #ifdef ENABLE_GETIFSTATS_CACHING
   41: 	current_time = time(NULL);
   42: 	if(current_time == ((time_t)-1)) {
   43: 		syslog(LOG_ERR, "getifstats() : time() error : %m");
   44: 	} else {
   45: 		if(current_time < cache_timestamp + GETIFSTATS_CACHING_DURATION) {
   46: 			/* return cached data */
   47: 			memcpy(data, &cache_data, sizeof(struct ifdata));
   48: 			return 0;
   49: 		}
   50: 	}
   51: #endif
   52: 	f = fopen("/proc/net/dev", "r");
   53: 	if(!f) {
   54: 		syslog(LOG_ERR, "getifstats() : cannot open /proc/net/dev : %m");
   55: 		return -1;
   56: 	}
   57: 	/* discard the two header lines */
   58: 	if(!fgets(line, sizeof(line), f) || !fgets(line, sizeof(line), f)) {
   59: 		syslog(LOG_ERR, "getifstats() : error reading /proc/net/dev : %m");
   60: 	}
   61: 	while(fgets(line, sizeof(line), f)) {
   62: 		p = line;
   63: 		while(*p==' ') p++;
   64: 		i = 0;
   65: 		while(ifname[i] == *p) {
   66: 			p++; i++;
   67: 		}
   68: 		/* TODO : how to handle aliases ? */
   69: 		if(ifname[i] || *p != ':')
   70: 			continue;
   71: 		p++;
   72: 		while(*p==' ') p++;
   73: 		data->ibytes = strtoul(p, &p, 0);
   74: 		while(*p==' ') p++;
   75: 		data->ipackets = strtoul(p, &p, 0);
   76: 		/* skip 6 columns */
   77: 		for(i=6; i>0 && *p!='\0'; i--) {
   78: 			while(*p==' ') p++;
   79: 			while(*p!=' ' && *p) p++;
   80: 		}
   81: 		while(*p==' ') p++;
   82: 		data->obytes = strtoul(p, &p, 0);
   83: 		while(*p==' ') p++;
   84: 		data->opackets = strtoul(p, &p, 0);
   85: 		r = 0;
   86: 		break;
   87: 	}
   88: 	fclose(f);
   89: 	/* get interface speed */
   90: 	snprintf(fname, sizeof(fname), "/sys/class/net/%s/speed", ifname);
   91: 	f = fopen(fname, "r");
   92: 	if(f) {
   93: 		if(fgets(line, sizeof(line), f)) {
   94: 			i = atoi(line);	/* 65535 means unknown */
   95: 			if(i > 0 && i < 65535)
   96: 				data->baudrate = 1000000*i;
   97: 		}
   98: 		fclose(f);
   99: 	} else {
  100: 		syslog(LOG_WARNING, "cannot read %s file : %m", fname);
  101: 	}
  102: #ifdef ENABLE_GETIFSTATS_CACHING
  103: 	if(r==0 && current_time!=((time_t)-1)) {
  104: 		/* cache the new data */
  105: 		cache_timestamp = current_time;
  106: 		memcpy(&cache_data, data, sizeof(struct ifdata));
  107: 	}
  108: #endif
  109: 	return r;
  110: }
  111: