I forgot to add these. Part of the patch from vodz

include/inet_common.h

@@ -0,0 +1,30 @@
+/*
+ * stolen from net-tools-1.59 and stripped down for busybox by
+ *                      Erik Andersen <andersee@debian.org>
+ *
+ * Heavily modified by Manuel Novoa III       Mar 12, 2001
+ *
+ * Version:     $Id: inet_common.h,v 1.1 2001/11/10 12:18:42 andersen Exp $
+ *
+ */
+
+#include <features.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+
+extern const char bb_INET_default[];    /* = "default" */
+
+/* hostfirst!=0 If we expect this to be a hostname,
+   try hostname database first
+ */
+extern int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst);
+
+
+/* numeric: & 0x8000: default instead of *,
+ *          & 0x4000: host instead of net,
+ *          & 0x0fff: don't resolve
+ */
+extern int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
+			 int numeric, unsigned int netmask);

libbb/inet_common.c

@@ -0,0 +1,174 @@
+/*
+ * stolen from net-tools-1.59 and stripped down for busybox by
+ *                      Erik Andersen <andersee@debian.org>
+ *
+ * Heavily modified by Manuel Novoa III       Mar 12, 2001
+ *
+ * Version:     $Id: inet_common.c,v 1.1 2001/11/10 12:18:42 andersen Exp $
+ *
+ */
+
+#include "inet_common.h"
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "libbb.h"
+
+const char bb_INET_default[]="default";
+
+int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
+{
+    struct hostent *hp;
+    struct netent *np;
+
+    /* Grmpf. -FvK */
+    s_in->sin_family = AF_INET;
+    s_in->sin_port = 0;
+
+    /* Default is special, meaning 0.0.0.0. */
+    if (!strcmp(name, bb_INET_default)) {
+	s_in->sin_addr.s_addr = INADDR_ANY;
+	return (1);
+    }
+    /* Look to see if it's a dotted quad. */
+    if (inet_aton(name, &s_in->sin_addr)) {
+	return 0;
+    }
+    /* If we expect this to be a hostname, try hostname database first */
+#ifdef DEBUG
+    if (hostfirst) fprintf (stderr, "gethostbyname (%s)\n", name);
+#endif
+    if (hostfirst &&
+	(hp = gethostbyname(name)) != (struct hostent *) NULL) {
+	memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
+		sizeof(struct in_addr));
+	return 0;
+    }
+    /* Try the NETWORKS database to see if this is a known network. */
+#ifdef DEBUG
+    fprintf (stderr, "getnetbyname (%s)\n", name);
+#endif
+    if ((np = getnetbyname(name)) != (struct netent *) NULL) {
+	s_in->sin_addr.s_addr = htonl(np->n_net);
+	return 1;
+    }
+    if (hostfirst) {
+	/* Don't try again */
+	errno = h_errno;
+	return -1;
+    }
+#ifdef DEBUG
+    res_init();
+    _res.options |= RES_DEBUG;
+#endif
+
+#ifdef DEBUG
+    fprintf (stderr, "gethostbyname (%s)\n", name);
+#endif
+    if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
+	errno = h_errno;
+	return -1;
+    }
+    memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
+	   sizeof(struct in_addr));
+
+    return 0;
+}
+
+/* cache */
+struct addr {
+    struct sockaddr_in addr;
+    char *name;
+    int host;
+    struct addr *next;
+};
+
+static struct addr *INET_nn = NULL;     /* addr-to-name cache           */
+
+/* numeric: & 0x8000: default instead of *,
+ *          & 0x4000: host instead of net,
+ *          & 0x0fff: don't resolve
+ */
+int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
+			 int numeric, unsigned int netmask)
+{
+    struct hostent *ent;
+    struct netent *np;
+    struct addr *pn;
+    unsigned long ad, host_ad;
+    int host = 0;
+
+    /* Grmpf. -FvK */
+    if (s_in->sin_family != AF_INET) {
+#ifdef DEBUG
+	fprintf(stderr, _("rresolve: unsupport address family %d !\n"), s_in->sin_family);
+#endif
+	errno = EAFNOSUPPORT;
+	return (-1);
+    }
+    ad = (unsigned long) s_in->sin_addr.s_addr;
+#ifdef DEBUG
+    fprintf (stderr, "rresolve: %08lx, mask %08x, num %08x \n", ad, netmask, numeric);
+#endif
+    if (ad == INADDR_ANY) {
+	if ((numeric & 0x0FFF) == 0) {
+	    if (numeric & 0x8000)
+		safe_strncpy(name, bb_INET_default, len);
+	    else
+		safe_strncpy(name, "*", len);
+	    return (0);
+	}
+    }
+    if (numeric & 0x0FFF) {
+	safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
+	return (0);
+    }
+
+    if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
+	host = 1;
+#if 0
+    INET_nn = NULL;
+#endif
+    pn = INET_nn;
+    while (pn != NULL) {
+	if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
+	    safe_strncpy(name, pn->name, len);
+#ifdef DEBUG
+	    fprintf (stderr, "rresolve: found %s %08lx in cache\n", (host? "host": "net"), ad);
+#endif
+	    return (0);
+	}
+	pn = pn->next;
+    }
+
+    host_ad = ntohl(ad);
+    np = NULL;
+    ent = NULL;
+    if (host) {
+#ifdef DEBUG
+	fprintf (stderr, "gethostbyaddr (%08lx)\n", ad);
+#endif
+	ent = gethostbyaddr((char *) &ad, 4, AF_INET);
+	if (ent != NULL)
+	    safe_strncpy(name, ent->h_name, len);
+    } else {
+#ifdef DEBUG
+	fprintf (stderr, "getnetbyaddr (%08lx)\n", host_ad);
+#endif
+	np = getnetbyaddr(host_ad, AF_INET);
+	if (np != NULL)
+	    safe_strncpy(name, np->n_name, len);
+    }
+    if ((ent == NULL) && (np == NULL))
+	safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
+    pn = (struct addr *) xmalloc(sizeof(struct addr));
+    pn->addr = *s_in;
+    pn->next = INET_nn;
+    pn->host = host;
+    pn->name = xstrdup(name);
+    INET_nn = pn;
+
+    return (0);
+}