int
doifaddrs(void) {
struct ifaddrs *ifaddr, *ifa;
char *name;
struct socket_address addr, broadcast;
struct in_addr netmask;
bzero(&addr, sizeof(addr));
bzero(&broadcast, sizeof(broadcast));
if (config.debug.overlayinterfaces) DEBUGF("called");
if (getifaddrs(&ifaddr) == -1)
return WHY_perror("getifaddr()");
broadcast.addrlen = sizeof(addr.inet);
broadcast.inet.sin_family = AF_INET;
for (ifa = ifaddr; ifa != NULL ; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr || !ifa->ifa_netmask)
continue;
/* We're only interested in IPv4 addresses */
if (ifa->ifa_addr->sa_family != AF_INET) {
if (config.debug.overlayinterfaces) DEBUGF("Skipping non-AF_INET address on %s", ifa->ifa_name);
continue;
}
/* Not broadcast? Not interested.. */
if ((ifa->ifa_flags & IFF_BROADCAST) == 0) {
if (config.debug.overlayinterfaces) DEBUGF("Skipping non-broadcast address on %s", ifa->ifa_name);
continue;
}
name = ifa->ifa_name;
addr.addrlen = sizeof(addr.inet);
bcopy(ifa->ifa_addr, &addr.addr, addr.addrlen);
netmask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
broadcast.inet.sin_addr.s_addr=addr.inet.sin_addr.s_addr | ~netmask.s_addr;
overlay_interface_register(name, &addr, &broadcast);
}
freeifaddrs(ifaddr);
return 0;
}
/* for when all other options fail, as can happen on Android,
if the permissions for the socket-based method are broken.
Down side is that it while it gets the interface name and
broadcast, it doesn't get the local address for that
interface.
*/
int scrapeProcNetRoute()
{
if (config.debug.overlayinterfaces) DEBUG("called");
FILE *f=fopen("/proc/net/route","r");
if (!f)
return WHY_perror("fopen(\"/proc/net/route\")");
char line[1024],name[1024],dest[1024],mask[1024];
/* skip header line */
line[0] = '\0';
if (fgets(line,1024,f) == NULL)
return WHYF_perror("fgets(%p,1024,\"/proc/net/route\")", line);
line[0] = '\0';
if (fgets(line,1024,f) == NULL)
return WHYF_perror("fgets(%p,1024,\"/proc/net/route\")", line);
struct socket_address addr, broadcast;
bzero(&addr, sizeof(addr));
bzero(&broadcast, sizeof(broadcast));
addr.addrlen = sizeof(addr.inet);
addr.inet.sin_family = AF_INET;
broadcast.addrlen = sizeof(addr.inet);
broadcast.inet.sin_family = AF_INET;
while(line[0]) {
int r;
if ((r=sscanf(line,"%s %s %*s %*s %*s %*s %*s %s",name,dest,mask))==3) {
addr.inet.sin_addr.s_addr=strtol(dest,NULL,16);
struct in_addr netmask = {.s_addr=strtol(mask,NULL,16)};
broadcast.inet.sin_addr.s_addr=addr.inet.sin_addr.s_addr | ~netmask.s_addr;
overlay_interface_register(name,&addr,&broadcast);
}
line[0] = '\0';
if (fgets(line,1024,f) == NULL)
return WHYF_perror("fgets(%p,1024,\"/proc/net/route\")", line);
}
fclose(f);
return 0;
}
int
lsif(void) {
char buf[8192];
struct ifconf ifc;
int sck;
struct ifreq *ifr;
struct in_addr netmask;
struct socket_address addr, broadcast;
bzero(&addr, sizeof(addr));
bzero(&broadcast, sizeof(broadcast));
if (config.debug.overlayinterfaces) DEBUG("called");
/* Get a socket handle. */
sck = socket(PF_INET, SOCK_DGRAM, 0);
if(sck < 0) {
WHY_perror("socket");
return 1;
}
/* Query available interfaces. */
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = buf;
if(ioctl(sck, SIOCGIFCONF, &ifc) < 0) {
WHY_perror("ioctl(SIOCGIFCONF)");
close(sck);
return 1;
}
broadcast.addrlen = sizeof(addr.inet);
broadcast.inet.sin_family = AF_INET;
/* Iterate through the list of interfaces. */
unsigned nInterfaces = 0;
unsigned ofs = 0;
while (ofs < (unsigned)ifc.ifc_len && ofs < sizeof buf) {
ifr = (struct ifreq *)(ifc.ifc_ifcu.ifcu_buf + ofs);
ofs += _SIZEOF_ADDR_IFREQ(*ifr);
/* We're only interested in IPv4 addresses */
if (ifr->ifr_ifru.ifru_addr.sa_family != AF_INET) {
if (config.debug.overlayinterfaces) DEBUGF("Skipping non-AF_INET address on %s", ifr->ifr_name);
continue;
}
addr.addrlen = sizeof(addr.inet);
bcopy(&ifr->ifr_ifru.ifru_addr, &addr.addr, addr.addrlen);
/* Get interface flags */
if (ioctl(sck, SIOCGIFFLAGS, ifr) == -1)
FATAL_perror("ioctl(SIOCGIFFLAGS)");
/* Not broadcast? Not interested.. */
if ((ifr->ifr_ifru.ifru_flags & IFF_BROADCAST) == 0) {
if (config.debug.overlayinterfaces) DEBUGF("Skipping non-broadcast address on %s", ifr->ifr_name);
continue;
}
/* Get netmask */
if (ioctl(sck, SIOCGIFNETMASK, ifr, sizeof(*ifr)) != 0) {
WHY_perror("ioctl(SIOCGIFNETMASK)");
continue;
}
netmask = ((struct sockaddr_in *)&ifr->ifr_ifru.ifru_addr)->sin_addr;
broadcast.inet.sin_addr.s_addr=addr.inet.sin_addr.s_addr | ~netmask.s_addr;
overlay_interface_register(ifr->ifr_name, &addr, &broadcast);
nInterfaces++;
}
if (config.debug.overlayinterfaces) DEBUGF("Examined %u interface addresses", nInterfaces);
close(sck);
return 0;
}
/* for when all other options fail, as can happen on Android,
if the permissions for the socket-based method are broken.
Down side is that it while it gets the interface name and
broadcast, it doesn't get the local address for that
interface.
*/
int scrapeProcNetRoute()
{
if (debug & DEBUG_OVERLAYINTERFACES) DEBUG("called");
FILE *f=fopen("/proc/net/route","r");
if (!f) return WHY_perror("fopen(\"/proc/net/route\")");
char line[1024],name[1024],dest[1024],mask[1024];
/* skip header line */
line[0]=0; fgets(line,1024,f);
line[0]=0; fgets(line,1024,f);
while(line[0]) {
int r;
if ((r=sscanf(line,"%s %s %*s %*s %*s %*s %*s %s",name,dest,mask))==3)
{
struct in_addr addr = {.s_addr=strtol(dest,NULL,16)};
struct in_addr netmask = {.s_addr=strtol(mask,NULL,16)};
overlay_interface_register(name,addr,netmask);
}
line[0]=0; fgets(line,1024,f);
}
fclose(f);
return 0;
}
#endif
#ifdef SIOCGIFCONF
/* Not present in Linux */
#ifndef _SIZEOF_ADDR_IFREQ
#define _SIZEOF_ADDR_IFREQ(x) sizeof(struct ifreq)
#endif
int
lsif(void) {
char buf[8192];
struct ifconf ifc;
int sck, nInterfaces, ofs;
struct ifreq *ifr;
struct in_addr addr, netmask;
if (debug & DEBUG_OVERLAYINTERFACES) DEBUG("called");
/* Get a socket handle. */
sck = socket(PF_INET, SOCK_DGRAM, 0);
if(sck < 0) {
WHY_perror("socket");
return 1;
}
/* Query available interfaces. */
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if(ioctl(sck, SIOCGIFCONF, &ifc) < 0) {
WHY_perror("ioctl(SIOCGIFCONF)");
close(sck);
return 1;
}
/* Iterate through the list of interfaces. */
nInterfaces = 0;
ofs = 0;
while (ofs < ifc.ifc_len && ofs < sizeof(buf)) {
ifr = (struct ifreq *)(ifc.ifc_ifcu.ifcu_buf + ofs);
ofs += _SIZEOF_ADDR_IFREQ(*ifr);
/* We're only interested in IPv4 addresses */
if (ifr->ifr_ifru.ifru_addr.sa_family != AF_INET) {
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("Skipping non-AF_INET address on %s", ifr->ifr_name);
continue;
}
addr = ((struct sockaddr_in *)&ifr->ifr_ifru.ifru_addr)->sin_addr;
/* Get interface flags */
if (ioctl(sck, SIOCGIFFLAGS, ifr) == -1)
FATAL_perror("ioctl(SIOCGIFFLAGS)");
/* Not broadcast? Not interested.. */
if ((ifr->ifr_ifru.ifru_flags & IFF_BROADCAST) == 0) {
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("Skipping non-broadcast address on %s", ifr->ifr_name);
continue;
}
/* Get netmask */
if (ioctl(sck, SIOCGIFNETMASK, ifr, sizeof(*ifr)) != 0) {
WHY_perror("ioctl(SIOCGIFNETMASK)");
continue;
}
netmask = ((struct sockaddr_in *)&ifr->ifr_ifru.ifru_addr)->sin_addr;
overlay_interface_register(ifr->ifr_name, addr, netmask);
nInterfaces++;
}
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("Examined %d interface addresses", nInterfaces);
close(sck);
return 0;
}
#endif
#ifdef HAVE_IFADDRS_H
int
doifaddrs(void) {
struct ifaddrs *ifaddr, *ifa;
char *name;
struct in_addr addr, netmask;
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("called");
if (getifaddrs(&ifaddr) == -1)
return WHY_perror("getifaddr()");
for (ifa = ifaddr; ifa != NULL ; ifa = ifa->ifa_next) {
/* We're only interested in IPv4 addresses */
if (ifa->ifa_addr->sa_family != AF_INET) {
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("Skipping non-AF_INET address on %s", ifa->ifa_name);
continue;
}
/* Not broadcast? Not interested.. */
if ((ifa->ifa_flags & IFF_BROADCAST) == 0) {
if (debug & DEBUG_OVERLAYINTERFACES) DEBUGF("Skipping non-broadcast address on %s", ifa->ifa_name);
continue;
}
name = ifa->ifa_name;
addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
netmask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
overlay_interface_register(name, addr, netmask);
}
freeifaddrs(ifaddr);
return 0;
}
