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Initial revision

    1: /* $Id: getifstats.c,v 1.1 2012/02/21 23:16:02 misho Exp $ */
    2: /* MiniUPnP project
    3:  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
    4:  * (c) 2006,2007 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 "../getifstats.h"
   15: #include "../config.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: #ifdef ENABLE_GETIFSTATS_CACHING
   26: 	static time_t cache_timestamp = 0;
   27: 	static struct ifdata cache_data;
   28: 	time_t current_time;
   29: #endif
   30: 	if(!data)
   31: 		return -1;
   32: 	data->baudrate = 4200000;
   33: 	data->opackets = 0;
   34: 	data->ipackets = 0;
   35: 	data->obytes = 0;
   36: 	data->ibytes = 0;
   37: 	if(!ifname || ifname[0]=='\0')
   38: 		return -1;
   39: #ifdef ENABLE_GETIFSTATS_CACHING
   40: 	current_time = time(NULL);
   41: 	if(current_time == ((time_t)-1)) {
   42: 		syslog(LOG_ERR, "getifstats() : time() error : %m");
   43: 	} else {
   44: 		if(current_time < cache_timestamp + GETIFSTATS_CACHING_DURATION) {
   45: 			memcpy(data, &cache_data, sizeof(struct ifdata));
   46: 			return 0;
   47: 		}
   48: 	}
   49: #endif
   50: 	f = fopen("/proc/net/dev", "r");
   51: 	if(!f) {
   52: 		syslog(LOG_ERR, "getifstats() : cannot open /proc/net/dev : %m");
   53: 		return -1;
   54: 	}
   55: 	/* discard the two header lines */
   56: 	if(!fgets(line, sizeof(line), f) || !fgets(line, sizeof(line), f)) {
   57: 		syslog(LOG_ERR, "getifstats() : error reading /proc/net/dev : %m");
   58: 	}
   59: 	while(fgets(line, sizeof(line), f)) {
   60: 		p = line;
   61: 		while(*p==' ') p++;
   62: 		i = 0;
   63: 		while(ifname[i] == *p) {
   64: 			p++; i++;
   65: 		}
   66: 		/* TODO : how to handle aliases ? */
   67: 		if(ifname[i] || *p != ':')
   68: 			continue;
   69: 		p++;
   70: 		while(*p==' ') p++;
   71: 		data->ibytes = strtoul(p, &p, 0);
   72: 		while(*p==' ') p++;
   73: 		data->ipackets = strtoul(p, &p, 0);
   74: 		/* skip 6 columns */
   75: 		for(i=6; i>0 && *p!='\0'; i--) {
   76: 			while(*p==' ') p++;
   77: 			while(*p!=' ' && *p) p++;
   78: 		}
   79: 		while(*p==' ') p++;
   80: 		data->obytes = strtoul(p, &p, 0);
   81: 		while(*p==' ') p++;
   82: 		data->opackets = strtoul(p, &p, 0);
   83: 		r = 0;
   84: 		break;
   85: 	}
   86: 	fclose(f);
   87: #ifdef ENABLE_GETIFSTATS_CACHING
   88: 	if(r==0 && current_time!=((time_t)-1)) {
   89: 		cache_timestamp = current_time;
   90: 		memcpy(&cache_data, data, sizeof(struct ifdata));
   91: 	}
   92: #endif
   93: 	return r;
   94: }
   95: