int readInterfaces(HSP *sp)
{
if(sp->adaptorList == NULL) sp->adaptorList = adaptorListNew();
else adaptorListMarkAll(sp->adaptorList);
// Walk the interfaces and collect the non-loopback interfaces so that we
// have a list of MAC addresses for each interface (usually only 1).
//
// May need to come back and run a variation of this where we supply
// a domain and collect the virtual interfaces for that domain in a
// similar way. It looks like we do that by just parsing the numbers
// out of the interface name.
int fd = socket (PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
fprintf (stderr, "error opening socket: %d (%s)\n", errno, strerror(errno));
return 0;
}
FILE *procFile = fopen("/proc/net/dev", "r");
if(procFile) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
char line[MAX_PROC_LINE_CHARS];
while(fgets(line, MAX_PROC_LINE_CHARS, procFile)) {
if(debug) myLog(LOG_INFO, "/proc/net/dev line: %s", line);
// the device name is always the token before the ":"
char *devName = strtok(line, ":");
if(devName) {
devName = trimWhitespace(devName);
if(devName && strlen(devName) < IFNAMSIZ) {
// we set the ifr_name field to make our queries
strcpy(ifr.ifr_name, devName);
if(debug > 1) {
myLog(LOG_INFO, "reading interface %s", devName);
}
// Get the flags for this interface
if(ioctl(fd,SIOCGIFFLAGS, &ifr) != 0) {
myLog(LOG_ERR, "device %s Get SIOCGIFFLAGS failed : %s",
devName,
strerror(errno));
}
else {
int up = (ifr.ifr_flags & IFF_UP) ? YES : NO;
int loopback = (ifr.ifr_flags & IFF_LOOPBACK) ? YES : NO;
int promisc = (ifr.ifr_flags & IFF_PROMISC) ? YES : NO;
int bond_master = (ifr.ifr_flags & IFF_MASTER) ? YES : NO;
//int hasBroadcast = (ifr.ifr_flags & IFF_BROADCAST);
//int pointToPoint = (ifr.ifr_flags & IFF_POINTOPOINT);
// used to igore loopback interfaces here, but now those
// are filtered at the point where we roll together the
// counters.
if(up) {
// Get the MAC Address for this interface
if(ioctl(fd,SIOCGIFHWADDR, &ifr) != 0) {
myLog(LOG_ERR, "device %s Get SIOCGIFHWADDR failed : %s",
devName,
strerror(errno));
}
// for now just assume that each interface has only one MAC. It's not clear how we can
// learn multiple MACs this way anyhow. It seems like there is just one per ifr record.
// find or create a new "adaptor" entry
SFLAdaptor *adaptor = adaptorListAdd(sp->adaptorList, devName, (u_char *)&ifr.ifr_hwaddr.sa_data, sizeof(HSPAdaptorNIO));
// clear the mark so we don't free it below
adaptor->marked = NO;
// this flag might belong in the adaptorNIO struct
adaptor->promiscuous = promisc;
// remember some useful flags in the userData structure
HSPAdaptorNIO *adaptorNIO = (HSPAdaptorNIO *)adaptor->userData;
adaptorNIO->loopback = loopback;
adaptorNIO->bond_master = bond_master;
adaptorNIO->vlan = HSP_VLAN_ALL; // may be modified below
// Try and get the ifIndex for this interface
if(ioctl(fd,SIOCGIFINDEX, &ifr) != 0) {
// only complain about this if we are debugging
if(debug) {
myLog(LOG_ERR, "device %s Get SIOCGIFINDEX failed : %s",
devName,
strerror(errno));
}
}
else {
adaptor->ifIndex = ifr.ifr_ifindex;
}
// Try to get the IP address for this interface
if(ioctl(fd,SIOCGIFADDR, &ifr) != 0) {
// only complain about this if we are debugging
if(debug) {
myLog(LOG_ERR, "device %s Get SIOCGIFADDR failed : %s",
devName,
strerror(errno));
}
}
else {
if (ifr.ifr_addr.sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)&ifr.ifr_addr;
// IP addr is now s->sin_addr
adaptorNIO->ipAddr.type = SFLADDRESSTYPE_IP_V4;
adaptorNIO->ipAddr.address.ip_v4.addr = s->sin_addr.s_addr;
}
//else if (ifr.ifr_addr.sa_family == AF_INET6) {
// not sure this ever happens - on a linux system IPv6 addresses
// are picked up from /proc/net/if_inet6
// struct sockaddr_in6 *s = (struct sockaddr_in6 *)&ifr.ifr_addr;
// IP6 addr is now s->sin6_addr;
//}
}
// Try to get the ethtool info for this interface so we can infer the
// ifDirection and ifSpeed. Learned from openvswitch (http://www.openvswitch.org).
struct ethtool_cmd ecmd = { 0 };
ecmd.cmd = ETHTOOL_GSET;
ifr.ifr_data = (char *)&ecmd;
if(ioctl(fd, SIOCETHTOOL, &ifr) == 0) {
adaptor->ifDirection = ecmd.duplex ? 1 : 2;
uint64_t ifSpeed_mb = ecmd.speed;
// ethtool_cmd_speed(&ecmd) is available in newer systems and uses the
// speed_hi field too, but we would need to run autoconf-style
// tests to see if it was there and we are trying to avoid that.
if(ifSpeed_mb == (uint16_t)-1 ||
ifSpeed_mb == (uint32_t)-1) {
// unknown
adaptor->ifSpeed = 0;
}
else {
adaptor->ifSpeed = ifSpeed_mb * 1000000;
}
}
}
}
}
}
}
fclose(procFile);
}
close (fd);
// now remove and free any that are still marked
adaptorListFreeMarked(sp->adaptorList);
// check in case any of the survivors are specific
// to a particular VLAN
readVLANs(sp);
// now that we have the evidence gathered together, we can
// set the L3 address priorities (used for auto-selecting
// the sFlow-agent-address if requrired to by the config.
setAddressPriorities(sp);
// now we can read IPv6 addresses too - they come from a
// different place. Depending on the address priorities this
// may cause the adaptor's best-choice ipAddress to be
// overwritten.
readIPv6Addresses(sp);
return sp->adaptorList->num_adaptors;
}
int readInterfaces(HSP *sp, uint32_t *p_added, uint32_t *p_removed, uint32_t *p_cameup, uint32_t *p_wentdown, uint32_t *p_changed)
{
uint32_t ad_added=0, ad_removed=0, ad_cameup=0, ad_wentdown=0, ad_changed=0;
if(sp->adaptorList == NULL) sp->adaptorList = adaptorListNew();
else adaptorListMarkAll(sp->adaptorList);
// Walk the interfaces and collect the non-loopback interfaces so that we
// have a list of MAC addresses for each interface (usually only 1).
//
// May need to come back and run a variation of this where we supply
// a domain and collect the virtual interfaces for that domain in a
// similar way. It looks like we do that by just parsing the numbers
// out of the interface name.
int fd = socket (PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
fprintf (stderr, "error opening socket: %d (%s)\n", errno, strerror(errno));
return 0;
}
FILE *procFile = fopen("/proc/net/dev", "r");
if(procFile) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
char line[MAX_PROC_LINE_CHARS];
int lineNo = 0;
while(fgets(line, MAX_PROC_LINE_CHARS, procFile)) {
if(lineNo++ < 2) continue; // skip headers
// the device name is always the first token before the ":"
char buf[MAX_PROC_LINE_CHARS];
char *p = line;
char *devName = parseNextTok(&p, " \t:", NO, '\0', NO, buf, MAX_PROC_LINE_CHARS);
if(devName && my_strlen(devName) < IFNAMSIZ) {
devName = trimWhitespace(devName);
if(devName && strlen(devName) < IFNAMSIZ) {
// we set the ifr_name field to make our queries
strncpy(ifr.ifr_name, devName, sizeof(ifr.ifr_name));
if(debug > 1) {
myLog(LOG_INFO, "reading interface %s", devName);
}
// Get the flags for this interface
if(ioctl(fd,SIOCGIFFLAGS, &ifr) < 0) {
myLog(LOG_ERR, "device %s Get SIOCGIFFLAGS failed : %s",
devName,
strerror(errno));
}
else {
int up = (ifr.ifr_flags & IFF_UP) ? YES : NO;
int loopback = (ifr.ifr_flags & IFF_LOOPBACK) ? YES : NO;
int promisc = (ifr.ifr_flags & IFF_PROMISC) ? YES : NO;
int bond_master = (ifr.ifr_flags & IFF_MASTER) ? YES : NO;
int bond_slave = (ifr.ifr_flags & IFF_SLAVE) ? YES : NO;
//int hasBroadcast = (ifr.ifr_flags & IFF_BROADCAST);
//int pointToPoint = (ifr.ifr_flags & IFF_POINTOPOINT);
// used to ignore loopback interfaces here, and interfaces
// that are currently marked down, but now those are
// filtered at the point where we roll together the
// counters, or build the list for export
// Get the MAC Address for this interface
if(ioctl(fd,SIOCGIFHWADDR, &ifr) < 0) {
myLog(LOG_ERR, "device %s Get SIOCGIFHWADDR failed : %s",
devName,
strerror(errno));
}
// for now just assume that each interface has only one MAC. It's not clear how we can
// learn multiple MACs this way anyhow. It seems like there is just one per ifr record.
// find or create a new "adaptor" entry
SFLAdaptor *adaptor = adaptorListGet(sp->adaptorList, devName);
if(adaptor == NULL) {
ad_added++;
adaptor = adaptorListAdd(sp->adaptorList, devName, (u_char *)&ifr.ifr_hwaddr.sa_data, sizeof(HSPAdaptorNIO));
}
// clear the mark so we don't free it below
adaptor->marked = NO;
// this flag might belong in the adaptorNIO struct
adaptor->promiscuous = promisc;
// remember some useful flags in the userData structure
HSPAdaptorNIO *adaptorNIO = (HSPAdaptorNIO *)adaptor->userData;
if(adaptorNIO->up != up) {
if(up) ad_cameup++;
else ad_wentdown++;
if(debug) {
myLog(LOG_INFO, "adaptor %s %s",
adaptor->deviceName,
up ? "came up" : "went down");
}
}
adaptorNIO->up = up;
adaptorNIO->loopback = loopback;
adaptorNIO->bond_master = bond_master;
adaptorNIO->bond_slave = bond_slave;
adaptorNIO->vlan = HSP_VLAN_ALL; // may be modified below
#ifdef HSP_SWITCHPORT_REGEX
if(regexec(&sp->swp_regex, devName, 0, NULL, 0) == 0) {
adaptorNIO->switchPort = YES;
}
#endif
// Try and get the ifIndex for this interface
if(ioctl(fd,SIOCGIFINDEX, &ifr) < 0) {
// only complain about this if we are debugging
if(debug) {
myLog(LOG_ERR, "device %s Get SIOCGIFINDEX failed : %s",
devName,
strerror(errno));
}
}
else {
adaptor->ifIndex = ifr.ifr_ifindex;
}
// Try to get the IP address for this interface
if(ioctl(fd,SIOCGIFADDR, &ifr) < 0) {
// only complain about this if we are debugging
if(debug) {
myLog(LOG_ERR, "device %s Get SIOCGIFADDR failed : %s",
devName,
strerror(errno));
}
}
else {
if (ifr.ifr_addr.sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)&ifr.ifr_addr;
// IP addr is now s->sin_addr
adaptorNIO->ipAddr.type = SFLADDRESSTYPE_IP_V4;
adaptorNIO->ipAddr.address.ip_v4.addr = s->sin_addr.s_addr;
}
//else if (ifr.ifr_addr.sa_family == AF_INET6) {
// not sure this ever happens - on a linux system IPv6 addresses
// are picked up from /proc/net/if_inet6
// struct sockaddr_in6 *s = (struct sockaddr_in6 *)&ifr.ifr_addr;
// IP6 addr is now s->sin6_addr;
//}
}
// use ethtool to get info about direction/speed and more
if(read_ethtool_info(&ifr, fd, adaptor) == YES) {
ad_changed++;
}
}
}
}
}
fclose(procFile);
}
close (fd);
// now remove and free any that are still marked
ad_removed = adaptorListFreeMarked(sp->adaptorList);
// check in case any of the survivors are specific
// to a particular VLAN
readVLANs(sp);
// now that we have the evidence gathered together, we can
// set the L3 address priorities (used for auto-selecting
// the sFlow-agent-address if requrired to by the config.
setAddressPriorities(sp);
// now we can read IPv6 addresses too - they come from a
// different place. Depending on the address priorities this
// may cause the adaptor's best-choice ipAddress to be
// overwritten.
readIPv6Addresses(sp);
if(p_added) *p_added = ad_added;
if(p_removed) *p_removed = ad_removed;
if(p_cameup) *p_cameup = ad_cameup;
if(p_wentdown) *p_wentdown = ad_wentdown;
if(p_changed) *p_changed = ad_changed;
return sp->adaptorList->num_adaptors;
}
