1 files changed, 249 insertions, 0 deletions

diff --git a/busybox/libbb/inet_common.c b/busybox/libbb/inet_common.c
new file mode 100644
index 000000000..321322d1f
--- /dev/null
+++ b/busybox/libbb/inet_common.c
@@ -0,0 +1,249 @@
+/*
+ * stolen from net-tools-1.59 and stripped down for busybox by
+ *                      Erik Andersen <andersen@codepoet.org>
+ *
+ * Heavily modified by Manuel Novoa III       Mar 12, 2001
+ *
+ * Version:     $Id: inet_common.c,v 1.8 2004/03/10 07:42:38 mjn3 Exp $
+ *
+ */
+
+#include "inet_common.h"
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "libbb.h"
+
+#ifdef DEBUG
+# include <resolv.h>
+#endif
+
+
+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) {
+                bb_error_msg("gethostbyname (%s)", 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
+        bb_error_msg("getnetbyname (%s)", 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
+        bb_error_msg("gethostbyname (%s)", 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
+                bb_error_msg("rresolve: unsupport address family %d !",
+                                  s_in->sin_family);
+#endif
+                errno = EAFNOSUPPORT;
+                return (-1);
+        }
+        ad = (unsigned long) s_in->sin_addr.s_addr;
+#ifdef DEBUG
+        bb_error_msg("rresolve: %08lx, mask %08x, num %08x", 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
+                        bb_error_msg("rresolve: found %s %08lx in cache",
+                                          (host ? "host" : "net"), ad);
+#endif
+                        return (0);
+                }
+                pn = pn->next;
+        }
+
+        host_ad = ntohl(ad);
+        np = NULL;
+        ent = NULL;
+        if (host) {
+#ifdef DEBUG
+                bb_error_msg("gethostbyaddr (%08lx)", ad);
+#endif
+                ent = gethostbyaddr((char *) &ad, 4, AF_INET);
+                if (ent != NULL) {
+                        safe_strncpy(name, ent->h_name, len);
+                }
+        } else {
+#ifdef DEBUG
+                bb_error_msg("getnetbyaddr (%08lx)", 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 = bb_xstrdup(name);
+        INET_nn = pn;
+
+        return (0);
+}
+
+#ifdef CONFIG_FEATURE_IPV6
+
+int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
+{
+        struct addrinfo req, *ai;
+        int s;
+
+        memset(&req, '\0', sizeof req);
+        req.ai_family = AF_INET6;
+        if ((s = getaddrinfo(name, NULL, &req, &ai))) {
+                bb_error_msg("getaddrinfo: %s: %d", name, s);
+                return -1;
+        }
+        memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
+
+        freeaddrinfo(ai);
+
+        return (0);
+}
+
+#ifndef IN6_IS_ADDR_UNSPECIFIED
+# define IN6_IS_ADDR_UNSPECIFIED(a) \
+        (((__u32 *) (a))[0] == 0 && ((__u32 *) (a))[1] == 0 && \
+         ((__u32 *) (a))[2] == 0 && ((__u32 *) (a))[3] == 0)
+#endif
+
+
+int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
+                                   int numeric)
+{
+        int s;
+
+        /* Grmpf. -FvK */
+        if (sin6->sin6_family != AF_INET6) {
+#ifdef DEBUG
+                bb_error_msg(_("rresolve: unsupport address family %d !\n"),
+                                  sin6->sin6_family);
+#endif
+                errno = EAFNOSUPPORT;
+                return (-1);
+        }
+        if (numeric & 0x7FFF) {
+                inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
+                return (0);
+        }
+        if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
+                if (numeric & 0x8000) {
+                        strcpy(name, "default");
+                } else {
+                        strcpy(name, "*");
+                }
+                return (0);
+        }
+
+        s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0);
+        if (s) {
+                bb_error_msg("getnameinfo failed");
+                return -1;
+        }
+        return (0);
+}
+
+#endif                                                  /* CONFIG_FEATURE_IPV6 */