Rewrite inet_pton() and inet_ntop() into compat

This should correct error handling cases.

compat/inet_pton.c

+/*****************************************************************************
+ * inet_pton.c: POSIX/IETF inet_pton() and inet_ntop() replacements
+ *****************************************************************************
+ * Copyright © 2011 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <sys/types.h>
+#ifndef WIN32
+# include <sys/socket.h>
+#else
+# include <winsock2.h>
+# define EAFNOSUPPORT WSAEAFNOSUPPORT
+#endif
+
+int inet_pton (int af, const char *src, void *dst)
+{
+    unsigned char *b = dst;
+
+    switch (af)
+    {
+        case AF_INET:
+            return sscanf (src, "%hhu.%hhu.%hhu.%hhu",
+                           b + 0, b + 1, b + 2, b + 3) == 4;
+    }
+    errno = EAFNOSUPPORT;
+    return -1;
+}
+
+const char *inet_ntop (int af, const void *src, char *dst, int len)
+{
+    const unsigned char *b = src;
+
+    switch (af)
+    {
+        case AF_INET:
+            if (snprintf (dst, len, "%hhu.%hhu.%hhu.%hhu",
+                          b[0], b[1], b[2], b[3]) <= len)
+            {
+                errno = ENOSPC;
+                return NULL;
+            }
+            return dst;
+    }
+    errno = EAFNOSUPPORT;
+    return NULL;
+}

configure.ac

@@ -559,7 +559,7 @@ need_libc=false
 dnl Check for usual libc functions
 AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
 AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r if_nameindex if_nametoindex isatty lstat memalign mmap openat pread posix_fadvise posix_madvise setlocale stricmp strnicmp uselocale])
-AC_REPLACE_FUNCS([asprintf atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r lldiv localtime_r nrand48 rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy vasprintf])
+AC_REPLACE_FUNCS([asprintf atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r inet_pton lldiv localtime_r nrand48 rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy vasprintf])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
 ])
@@ -1645,22 +1645,6 @@ AS_IF([test "${enable_vlm}" != "no"], [
 AM_CONDITIONAL([ENABLE_VLM], [test "${enable_vlm}" != "no"])
 
 
-dnl
-dnl  ipv6 support
-dnl
-have_ipv6=no
-AC_CHECK_FUNCS(inet_pton,[have_ipv6=yes],[
-  AC_CHECK_LIB(nsl,inet_pton, [have_ipv6=yes])
-])
-
-AS_IF([test "${have_ipv6}" = "yes"], [
-  AC_DEFINE(HAVE_INET_PTON, 1, [Define to 1 if you have inet_pton().])])
-
-
-AC_CHECK_FUNCS(inet_ntop,[
-  AC_DEFINE(HAVE_INET_NTOP, 1, [Define to 1 if you have inet_ntop().])])
-
-
 dnl
 dnl  Input plugins
 dnl

include/vlc_fixups.h

@@ -250,11 +250,8 @@ void swab (const void *, void *, ssize_t);
 
 /* Socket stuff */
 #ifndef HAVE_INET_PTON
-# define inet_pton vlc_inet_pton
-#endif
-
-#ifndef HAVE_INET_NTOP
-# define inet_ntop vlc_inet_ntop
+int inet_pton(int, const char *, void *);
+const char *inet_ntop(int, const void *, char *, int);
 #endif
 
 #ifndef HAVE_STRUCT_POLLFD

include/vlc_network.h

@@ -163,9 +163,6 @@ VLC_API ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *, co
 VLC_API ssize_t net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *, const char *psz_fmt, va_list args );
 #define net_vaPrintf(a,b,c,d,e) net_vaPrintf(VLC_OBJECT(a),b,c,d,e)
 
-VLC_API int vlc_inet_pton(int af, const char *src, void *dst);
-VLC_API const char *vlc_inet_ntop(int af, const void *src,
-                                  char *dst, socklen_t cnt);
 struct pollfd;
 VLC_API int vlc_poll(struct pollfd *fds, unsigned nfds, int timeout);
 

src/libvlccore.sym

@@ -549,8 +549,6 @@ vlc_hold
 vlc_iconv
 vlc_iconv_close
 vlc_iconv_open
-vlc_inet_ntop
-vlc_inet_pton
 vlc_join
 vlc_list_children
 vlc_list_release

src/network/getaddrinfo.c

@@ -189,88 +189,3 @@ out:
     LocaleFree (node);
     return ret;
 }
-
-
-/**
- * inet_pton() replacement
- */
-int vlc_inet_pton (int af, const char *src, void *dst)
-{
-#ifndef HAVE_INET_PTON
-    /* Windows Vista has inet_pton(), but not XP. */
-    /* We have a pretty good example of abstraction inversion here... */
-    struct addrinfo hints = {
-        .ai_family = af,
-        .ai_socktype = SOCK_DGRAM, /* make sure we have... */
-        .ai_protocol = IPPROTO_UDP, /* ...only one response */
-        .ai_flags = AI_NUMERICHOST,
-    }, *res;
-
-    if (getaddrinfo (src, NULL, &hints, &res))
-        return 0;
-
-    const void *data;
-    size_t len;
-
-    switch (af)
-    {
-        case AF_INET:
-            data = &((const struct sockaddr_in *)res->ai_addr)->sin_addr;
-            len = sizeof (struct in_addr);
-            break;
-#ifdef AF_INET6
-        case AF_INET6:
-            data = &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
-            len = sizeof (struct in6_addr);
-            break;
-#endif
-        default:
-            freeaddrinfo (res);
-            return -1;
-    }
-    memcpy (dst, data, len);
-    freeaddrinfo (res);
-    return 1;
-#else /* HAVE_INET_PTON */
-    return inet_pton( af, src, dst );
-#endif /* HAVE_INET_PTON */
-}
-
-/**
- * inet_ntop() replacement
- */
-const char *vlc_inet_ntop (int af, const void *src, char *dst, socklen_t cnt)
-{
-#ifndef HAVE_INET_NTOP
-    int ret = EAI_FAMILY;
-
-    switch (af)
-    {
-#ifdef AF_INET6
-        case AF_INET6:
-            {
-                struct sockaddr_in6 addr;
-                memset (&addr, 0, sizeof(addr));
-                addr.sin6_family = AF_INET6;
-                addr.sin6_addr = *(struct in6_addr *)src;
-                ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr),
-                                   dst, cnt, NULL, 0, NI_NUMERICHOST);
-            }
-
-#endif
-        case AF_INET:
-            {
-                struct sockaddr_in addr;
-                memset(&addr, 0, sizeof(addr));
-                addr.sin_family = AF_INET;
-                addr.sin_addr = *(struct in_addr *)src;
-                ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr),
-                                   dst, cnt, NULL, 0, NI_NUMERICHOST);
-            }
-    }
-    return (ret == 0) ? dst : NULL;
-#else /* HAVE_INET_NTOP */
-    return inet_ntop( af, src, dst, cnt );
-#endif /* HAVE_INET_NTOP */
-}
-