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/* $Id: getifstats.c,v 1.16 2020/05/10 17:51:00 nanard Exp $ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2020 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <time.h>
#include "config.h"
#include "../getifstats.h"
#ifdef GET_WIRELESS_STATS
#include <unistd.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <linux/wireless.h>
#endif /* GET_WIRELESS_STATS */
/* that is the answer */
#define BAUDRATE_DEFAULT 4200000
/* this custom implementation of strtoul() rollover
* this is needed by the UPnP standard */
static unsigned long my_strtoul(const char * p, char ** endptr, int base)
{
unsigned long value;
if (base == 0) {
/* autodetect base :
* 0xnnnnn is hexadecimal
* 0nnnnnn is octal
* everything else is decimal */
if (*p == '0') {
p++;
if (*p == 'x') {
p++;
base = 16;
} else {
base = 8;
}
} else {
base = 10;
}
}
for (value = 0; *p >= '0'; p++) {
value *= (unsigned long)base;
if (*p <= '9') {
if (base < 10 && *p >= ('0' + base))
break;
value += (unsigned long)(*p - '0'); /* 0-9 */
} else if (base <= 10 || *p < 'A') {
break;
} else if (*p < ('A' + base - 10)) {
value += (unsigned long)(*p - 'A' + 10); /* A-F */
} else if (*p >= 'a' && *p < ('a' + base - 10)) {
value += (unsigned long)(*p - 'a' + 10); /* a-f */
} else {
break;
}
}
if (endptr != NULL)
*endptr = (char *)p;
return value;
}
int
getifstats(const char * ifname, struct ifdata * data)
{
FILE *f;
char line[512];
char * p;
int i;
int r = -1;
char fname[64];
#ifdef ENABLE_GETIFSTATS_CACHING
static time_t cache_timestamp = 0;
static struct ifdata cache_data;
time_t current_time;
#endif /* ENABLE_GETIFSTATS_CACHING */
if(!data)
return -1;
data->baudrate = BAUDRATE_DEFAULT;
data->opackets = 0;
data->ipackets = 0;
data->obytes = 0;
data->ibytes = 0;
if(!ifname || ifname[0]=='\0')
return -1;
#ifdef ENABLE_GETIFSTATS_CACHING
current_time = upnp_time();
if(current_time == ((time_t)-1)) {
syslog(LOG_ERR, "getifstats() : time() error : %m");
} else {
if(current_time < cache_timestamp + GETIFSTATS_CACHING_DURATION) {
/* return cached data */
memcpy(data, &cache_data, sizeof(struct ifdata));
return 0;
}
}
#endif /* ENABLE_GETIFSTATS_CACHING */
f = fopen("/proc/net/dev", "r");
if(!f) {
syslog(LOG_ERR, "getifstats() : cannot open /proc/net/dev : %m");
return -1;
}
/* discard the two header lines */
if(!fgets(line, sizeof(line), f) || !fgets(line, sizeof(line), f)) {
syslog(LOG_ERR, "getifstats() : error reading /proc/net/dev : %m");
}
while(fgets(line, sizeof(line), f)) {
p = line;
while(*p==' ') p++;
i = 0;
while(ifname[i] == *p) {
p++; i++;
}
/* TODO : how to handle aliases ? */
if(ifname[i] || *p != ':')
continue;
p++;
while(*p==' ') p++;
data->ibytes = my_strtoul(p, &p, 0);
while(*p==' ') p++;
data->ipackets = my_strtoul(p, &p, 0);
/* skip 6 columns */
for(i=6; i>0 && *p!='\0'; i--) {
while(*p==' ') p++;
while(*p!=' ' && *p) p++;
}
while(*p==' ') p++;
data->obytes = my_strtoul(p, &p, 0);
while(*p==' ') p++;
data->opackets = my_strtoul(p, &p, 0);
r = 0;
break;
}
fclose(f);
/* get interface speed */
snprintf(fname, sizeof(fname), "/sys/class/net/%s/speed", ifname);
f = fopen(fname, "r");
if(f) {
if(fgets(line, sizeof(line), f)) {
i = atoi(line); /* 65535 means unknown */
if(i > 0 && i < 65535)
data->baudrate = 1000000*i;
}
fclose(f);
} else {
syslog(LOG_INFO, "cannot read %s file : %m", fname);
}
#ifdef GET_WIRELESS_STATS
if(data->baudrate == BAUDRATE_DEFAULT) {
struct iwreq iwr;
int s;
s = socket(AF_INET, SOCK_DGRAM, 0);
if(s >= 0) {
strncpy(iwr.ifr_name, ifname, IFNAMSIZ);
if(ioctl(s, SIOCGIWRATE, &iwr) >= 0) {
data->baudrate = iwr.u.bitrate.value;
}
close(s);
}
}
#endif /* GET_WIRELESS_STATS */
#ifdef ENABLE_GETIFSTATS_CACHING
if(r==0 && current_time!=((time_t)-1)) {
/* cache the new data */
cache_timestamp = current_time;
memcpy(&cache_data, data, sizeof(struct ifdata));
}
#endif /* ENABLE_GETIFSTATS_CACHING */
return r;
}
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