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discoverInterfaces() correctly ignore non-IPv4 addresses

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Must check sa_family early, before attempting to copy
in case sockaddr needs more storage than sockaddr_in.
This commit is contained in:
Michael Davidsaver
2020-11-20 12:23:18 -08:00
parent 684da91675
commit fc4e3c5d44
1 changed files with 27 additions and 38 deletions
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65
src/utils/inetAddressUtil.cpp
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@ -200,8 +200,6 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
struct ifconf ifconf;
struct ifreq *pIfreqList;
struct ifreq *pIfreqListEnd;
struct ifreq *pifreq;
struct ifreq *pnextifreq;
int match;
/*
@ -210,13 +208,13 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
* nelem is set to the maximum interfaces
* on one machine here
*/
pIfreqList = (struct ifreq *) calloc ( nelem, sizeof(*pifreq) );
pIfreqList = (struct ifreq *) calloc ( nelem, sizeof(*pIfreqList) );
if (!pIfreqList) {
errlogPrintf ("discoverInterfaces(): no memory to complete request\n");
return -1;
}
ifconf.ifc_len = nelem * sizeof(*pifreq);
ifconf.ifc_len = nelem * sizeof(*pIfreqList);
ifconf.ifc_req = pIfreqList;
status = socket_ioctl (socket, SIOCGIFCONF, &ifconf);
if (status < 0 || ifconf.ifc_len == 0) {
@ -226,30 +224,21 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
}
pIfreqListEnd = (struct ifreq *) (ifconf.ifc_len + (char *) pIfreqList);
pIfreqListEnd--;
for ( pifreq = pIfreqList; pifreq <= pIfreqListEnd; pifreq = pnextifreq ) {
uint32_t current_ifreqsize;
for (struct ifreq *pifreq = pIfreqList; pifreq < pIfreqListEnd; pifreq = ifreqNext (pifreq) ) {
union {
ifreq req;
// struct ifreq is a tuple of (ifname, union data)
// To accommodate targets with sockaddr::sa_len, make sure
// we have enough storage.
char alloc[sizeof(pIfreqList->ifr_name) + sizeof(sockaddr_in)];
}scratch;
/*
* find the next ifreq
*/
pnextifreq = ifreqNext (pifreq);
/* determine ifreq size */
current_ifreqsize = ifreqSize ( pifreq );
/* copy current ifreq to aligned bufferspace (to start of pIfreqList buffer) */
/* be careful as we re-use part of this space several times below.
* Any member other than ifr_name is invalidated by an ioctl() call
*/
memmove(pIfreqList, pifreq, current_ifreqsize);
/*
* If its not an internet interface then dont use it
*/
if ( pIfreqList->ifr_addr.sa_family != AF_INET ) {
if(pifreq->ifr_addr.sa_family != AF_INET)
continue;
}
// copy to ensure aligned access
memcpy(&scratch.req, pifreq, ifreqSize ( pifreq ));
/*
* if it isnt a wildcarded interface then look for
@ -261,7 +250,7 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
continue;
}
if ( pMatchAddr->ia.sin_addr.s_addr != htonl (INADDR_ANY) ) {
struct sockaddr_in *pInetAddr = (struct sockaddr_in *) &pIfreqList->ifr_addr;
struct sockaddr_in *pInetAddr = (struct sockaddr_in *) &scratch.req.ifr_addr;
if ( pInetAddr->sin_addr.s_addr != pMatchAddr->ia.sin_addr.s_addr ) {
continue;
}
@ -271,15 +260,15 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
}
ifaceNode node;
node.addr.sa = pIfreqList->ifr_addr;
node.addr.sa = scratch.req.ifr_addr;
status = socket_ioctl ( socket, SIOCGIFFLAGS, pIfreqList );
status = socket_ioctl ( socket, SIOCGIFFLAGS, &scratch.req );
if ( status ) {
errlogPrintf ("discoverInterfaces(): net intf flags fetch for \"%s\" failed\n", pIfreqList->ifr_name);
errlogPrintf ("discoverInterfaces(): net intf flags fetch for \"%s\" failed\n", scratch.req.ifr_name);
continue;
}
unsigned short ifflags = pIfreqList->ifr_flags;
unsigned short ifflags = scratch.req.ifr_flags;
node.loopback = ifflags & IFF_LOOPBACK;
/*
@ -309,19 +298,19 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
* interface.
*/
if ( ifflags & IFF_BROADCAST ) {
status = socket_ioctl (socket, SIOCGIFBRDADDR, pIfreqList);
status = socket_ioctl (socket, SIOCGIFBRDADDR, &scratch.req);
if ( status ) {
errlogPrintf ("discoverInterfaces(): net intf \"%s\": bcast addr fetch fail\n", pIfreqList->ifr_name);
errlogPrintf ("discoverInterfaces(): net intf \"%s\": bcast addr fetch fail\n", scratch.req.ifr_name);
continue;
}
node.bcast.sa = pIfreqList->ifr_broadaddr;
node.bcast.sa = scratch.req.ifr_broadaddr;
status = socket_ioctl (socket, SIOCGIFNETMASK, pIfreqList);
status = socket_ioctl (socket, SIOCGIFNETMASK, &scratch.req);
if ( status ) {
errlogPrintf ("discoverInterfaces(): net intf \"%s\": netmask fetch fail\n", pIfreqList->ifr_name);
errlogPrintf ("discoverInterfaces(): net intf \"%s\": netmask fetch fail\n", scratch.req.ifr_name);
continue;
}
node.mask.sa = pIfreqList->ifr_netmask;
node.mask.sa = scratch.req.ifr_netmask;
checkNode(node);
@ -329,11 +318,11 @@ int discoverInterfaces(IfaceNodeVector &list, SOCKET socket, const osiSockAddr *
}
#if defined (IFF_POINTOPOINT)
else if ( ifflags & IFF_POINTOPOINT ) {
status = socket_ioctl ( socket, SIOCGIFDSTADDR, pIfreqList);
status = socket_ioctl ( socket, SIOCGIFDSTADDR, &scratch.req);
if ( status ) {
continue;
}
node.peer.sa = pIfreqList->ifr_dstaddr;
node.peer.sa = scratch.req.ifr_dstaddr;
node.validP2P = true;
}
#endif