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Pretty up doifaddrs() same as lsif().

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This commit is contained in:
Daniel O'Connor 2012-06-08 17:00:50 +09:30
parent ea9993dc91
commit 9d8d6ed94f
1 changed files with 34 additions and 23 deletions
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57
lsif.c
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@ -184,34 +184,45 @@ lsif(void) {
#endif
#ifdef HAVE_IFADDRS_H
int doifaddrs(void) {
struct ifaddrs *ifaddr,*ifa;
int family;
int
doifaddrs(void) {
struct ifaddrs *ifaddr, *ifa;
char addrtxt[INET_ADDRSTRLEN], bcasttxt[INET_ADDRSTRLEN];
char *name;
struct sockaddr_in local, netmask, broadcast;
if (debug & DEBUG_OVERLAYINTERFACES) INFOF("called");
if (getifaddrs(&ifaddr) == -1) {
WHY_perror("getifaddr()");
return WHY("getifaddrs() failed");
}
if (getifaddrs(&ifaddr) == -1)
return WHY_perror("getifaddr()");
/* Check through actual network interfaces */
for (ifa=ifaddr;ifa!=NULL;ifa=ifa->ifa_next) {
family=ifa->ifa_addr->sa_family;
switch(family) {
case AF_INET:
{
unsigned char *name=(unsigned char *)ifa->ifa_name;
struct sockaddr_in local=*(struct sockaddr_in *)ifa->ifa_addr;
struct sockaddr_in netmask=*(struct sockaddr_in *)ifa->ifa_netmask;
struct sockaddr_in broadcast=local;
broadcast.sin_addr.s_addr|=(~netmask.sin_addr.s_addr);
if (debug&DEBUG_OVERLAYINTERFACES) printf("%s: %08x %08x %08x\n",name,local.sin_addr.s_addr,netmask.sin_addr.s_addr,broadcast.sin_addr.s_addr);
overlay_interface_register(name,local,broadcast);
break;
}
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) INFOF("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) INFOF("Skipping non-broadcast address on %s", ifa->ifa_name);
continue;
}
name = ifa->ifa_name;
local = *(struct sockaddr_in *)ifa->ifa_addr;
netmask = *(struct sockaddr_in *)ifa->ifa_netmask;
broadcast = local;
/* Compute broadcast address */
broadcast.sin_addr.s_addr |= (~netmask.sin_addr.s_addr);
assert(inet_ntop(AF_INET, (const void *)&local.sin_addr, addrtxt, INET_ADDRSTRLEN) != NULL);
assert(inet_ntop(AF_INET, (const void *)&broadcast.sin_addr, bcasttxt, INET_ADDRSTRLEN) != NULL);
if (debug & DEBUG_OVERLAYINTERFACES) INFOF("name=%s addr=%s broad=%s", name, addrtxt, bcasttxt);
overlay_interface_register(name,local,broadcast);
}
freeifaddrs(ifaddr);