Added getifaddrs()

lib/ip/Makefile.in

@@ -22,6 +22,7 @@ libc_FILES=" \
 	gethnmadr.c \
 	gethostent.c \
 	gethostname.c \
+	getifaddrs.c \
 	getnetbyaddr.c \
 	getnetbyname.c \
 	getnetent.c \

lib/ip/getifaddrs.c

@@ -0,0 +1,71 @@
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <ifaddrs.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+
+#include <net/gen/in.h>
+#include <net/gen/ip_io.h>
+#include <net/gen/tcp.h>
+#include <net/gen/tcp_io.h>
+#include <net/gen/udp.h>
+#include <net/gen/udp_io.h>
+
+int
+getifaddrs(struct ifaddrs **ifap)
+{
+	static int fd = -1;
+	nwio_ipconf_t ipconf;
+	int flags, err, r;
+	static struct ifaddrs ifa;
+	static struct sockaddr_in addr, netmask;
+
+	memset(&ifa, 0, sizeof(ifa));
+	memset(&addr, 0, sizeof(addr));
+	memset(&netmask, 0, sizeof(netmask));
+	ifa.ifa_next = NULL;
+	ifa.ifa_name = "ip";
+	addr.sin_family = netmask.sin_family = AF_INET;
+	ifa.ifa_addr = (struct sockaddr *) &addr;
+	ifa.ifa_netmask = (struct sockaddr *) &netmask;
+	addr.sin_addr.s_addr = 0;
+	netmask.sin_addr.s_addr = 0;
+
+	if(fd < 0) {
+		char *ipd;
+		if(!(ipd=getenv("IP_DEVICE")))
+			ipd="/dev/ip";
+		if((fd = open(ipd, O_RDWR)) < 0)
+			return -1;
+	}
+
+	/* Code taken from commands/simple/ifconfig.c. */
+
+	if((flags = fcntl(fd, F_GETFL)) < 0 ||
+	   fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 ||
+	   ioctl(fd, NWIOGIPCONF, &ipconf))
+		return 0;	/* Report interface as down. */
+
+	addr.sin_addr.s_addr = ipconf.nwic_ipaddr;
+	netmask.sin_addr.s_addr = ipconf.nwic_netmask;
+	if(addr.sin_addr.s_addr) ifa.ifa_flags = IFF_UP;
+
+	/* Just report on this interface. */
+
+	*ifap = &ifa;
+
+	return 0;
+}
+
+void
+freeifaddrs(struct ifaddrs *ifp)
+{
+	/* getifaddrs points to static data, so no need to free. */
+	;
+}
+