>From af91361c52509a4dc0e910c36ebefd16069d19a5 Mon Sep 17 00:00:00 2001
From: KO Myung-Hun <komh@chollian.net>
Date: Tue, 6 Dec 2011 22:26:43 +0900
Subject: [PATCH 6/9] Add missing getaddrinfo(), freeaddrinfo(), getnameinfo() and gai_strerror() for OS/2

---
 include/vlc_network.h |   34 +++++
 src/Makefile.am       |    1 +
 src/os2/getaddrinfo.c |  354 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 389 insertions(+), 0 deletions(-)
 create mode 100644 src/os2/getaddrinfo.c

diff --git a/include/vlc_network.h b/include/vlc_network.h
index e9b156d..dcf6e21 100644
--- a/include/vlc_network.h
+++ b/include/vlc_network.h
@@ -230,6 +230,40 @@ VLC_API int vlc_poll(struct pollfd *fds, unsigned nfds, int timeout);
 # define AI_NUMERICSERV 0
 #endif
 
+#ifdef __OS2__
+# ifndef NI_NUMERICHOST
+#  define NI_NUMERICHOST 0x01
+#  define NI_NUMERICSERV 0x02
+#  define NI_NOFQDN      0x04
+#  define NI_NAMEREQD    0x08
+#  define NI_DGRAM       0x10
+# endif
+
+struct addrinfo
+{
+    int ai_flags;
+    int ai_family;
+    int ai_socktype;
+    int ai_protocol;
+    size_t ai_addrlen;
+    struct sockaddr *ai_addr;
+    char *ai_canonname;
+    struct addrinfo *ai_next;
+};
+
+# define AI_PASSIVE     1
+# define AI_CANONNAME   2
+# define AI_NUMERICHOST 4
+
+VLC_API const char *gai_strerror( int errnum );
+
+VLC_API int  getaddrinfo ( const char *, const char *,
+                           const struct addrinfo *, struct addrinfo ** );
+VLC_API void freeaddrinfo( struct addrinfo * );
+VLC_API int  getnameinfo ( const struct sockaddr *, socklen_t,
+                           char *, int, char *, int, int );
+#endif
+
 VLC_API int vlc_getnameinfo( const struct sockaddr *, int, char *, int, int *, int );
 VLC_API int vlc_getaddrinfo( vlc_object_t *, const char *, int, const struct addrinfo *, struct addrinfo ** );
 
diff --git a/src/Makefile.am b/src/Makefile.am
index e93961d..68df67a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -277,6 +277,7 @@ SOURCES_libvlc_symbian = \
 	$(NULL)
 
 SOURCES_libvlc_os2 = \
+	os2/getaddrinfo.c \
 	os2/dirs.c \
 	misc/atomic.c \
 	posix/filesystem.c \
diff --git a/src/os2/getaddrinfo.c b/src/os2/getaddrinfo.c
new file mode 100644
index 0000000..6b03f24
--- /dev/null
+++ b/src/os2/getaddrinfo.c
@@ -0,0 +1,354 @@
+/*****************************************************************************
+ * getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
+ *****************************************************************************
+ * Copyright (C) 2005 the VideoLAN team
+ * Copyright (C) 2002-2007 Rémi Denis-Courmont
+ * Copyright (C) 2011 KO Myung-Hun
+ *
+ * Authors: KO Myung-Hun <komh@chollian.net>
+ *          Rémi Denis-Courmont <rem # videolan.org>
+ *
+ * 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 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 <vlc_common.h>
+#include <vlc_network.h>
+
+#include <arpa/inet.h>
+
+static const struct
+{
+    int        code;
+    const char msg[41];
+} gai_errlist[] =
+{
+    { 0,              "Error 0" },
+    { EAI_BADFLAGS,   "Invalid flag used" },
+    { EAI_NONAME,     "Host or service not found" },
+    { EAI_AGAIN,      "Temporary name service failure" },
+    { EAI_FAIL,       "Non-recoverable name service failure" },
+    { EAI_NODATA,     "No data for host name" },
+    { EAI_FAMILY,     "Unsupported address family" },
+    { EAI_SOCKTYPE,   "Unsupported socket type" },
+    { EAI_SERVICE,    "Incompatible service for socket type" },
+    { EAI_ADDRFAMILY, "Unavailable address family for host name" },
+    { EAI_MEMORY,     "Memory allocation failure" },
+    { EAI_OVERFLOW,   "Buffer overflow" },
+    { EAI_SYSTEM,     "System error" },
+    { 0,              "" },
+};
+
+static const char gai_unknownerr[] = "Unrecognized error number";
+
+/****************************************************************************
+ * Converts an EAI_* error code into human readable english text.
+ ****************************************************************************/
+const char *gai_strerror (int errnum)
+{
+    for (unsigned i = 0; *gai_errlist[i].msg; i++)
+        if (errnum == gai_errlist[i].code)
+            return gai_errlist[i].msg;
+
+    return gai_unknownerr;
+}
+
+#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\
+                  NI_DGRAM)
+/*
+ * getnameinfo() non-thread-safe IPv4-only implementation,
+ * Address-family-independent address to hostname translation
+ * (reverse DNS lookup in case of IPv4).
+ *
+ * This is meant for use on old IP-enabled systems that are not IPv6-aware,
+ * and probably do not have getnameinfo(), but have the old gethostbyaddr()
+ * function.
+ */
+int
+getnameinfo (const struct sockaddr *sa, socklen_t salen,
+                 char *host, int hostlen, char *serv, int servlen, int flags)
+{
+    if (((size_t)salen < sizeof (struct sockaddr_in))
+     || (sa->sa_family != AF_INET))
+        return EAI_FAMILY;
+    else if (flags & (~_NI_MASK))
+        return EAI_BADFLAGS;
+    else
+    {
+        const struct sockaddr_in *addr;
+
+        addr = (const struct sockaddr_in *)sa;
+
+        if (host != NULL)
+        {
+            /* host name resolution */
+            if (!(flags & NI_NUMERICHOST))
+            {
+                if (flags & NI_NAMEREQD)
+                    return EAI_NONAME;
+            }
+
+            /* inet_ntoa() is not thread-safe, do not use it */
+            uint32_t ipv4 = ntohl (addr->sin_addr.s_addr);
+
+            if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24,
+                          (ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff,
+                          ipv4 & 0xff) >= (int)hostlen)
+                return EAI_OVERFLOW;
+        }
+
+        if (serv != NULL)
+        {
+            if (snprintf (serv, servlen, "%u",
+                          (unsigned int)ntohs (addr->sin_port)) >= (int)servlen)
+                return EAI_OVERFLOW;
+        }
+    }
+    return 0;
+}
+
+#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
+/*
+ * Converts the current herrno error value into an EAI_* error code.
+ * That error code is normally returned by getnameinfo() or getaddrinfo().
+ */
+static int
+gai_error_from_herrno (void)
+{
+    switch (h_errno)
+    {
+        case HOST_NOT_FOUND:
+            return EAI_NONAME;
+
+        case NO_ADDRESS:
+# if (NO_ADDRESS != NO_DATA)
+        case NO_DATA:
+# endif
+            return EAI_NODATA;
+
+        case NO_RECOVERY:
+            return EAI_FAIL;
+
+        case TRY_AGAIN:
+            return EAI_AGAIN;
+    }
+    return EAI_SYSTEM;
+}
+
+/*
+ * This functions must be used to free the memory allocated by getaddrinfo().
+ */
+void freeaddrinfo (struct addrinfo *res)
+{
+    if (res == NULL)
+        return;
+    free (res->ai_canonname);
+    free (res->ai_addr);
+    free (res->ai_next);
+    free (res);
+}
+
+/*
+ * Internal function that builds an addrinfo struct.
+ */
+static struct addrinfo *
+makeaddrinfo (int af, int type, int proto,
+              const struct sockaddr *addr, size_t addrlen,
+              const char *canonname)
+{
+    struct addrinfo *res;
+
+    res = (struct addrinfo *)malloc (sizeof (struct addrinfo));
+    if (res != NULL)
+    {
+        res->ai_flags = 0;
+        res->ai_family = af;
+        res->ai_socktype = type;
+        res->ai_protocol = proto;
+        res->ai_addrlen = addrlen;
+        res->ai_addr = malloc (addrlen);
+        res->ai_canonname = NULL;
+        res->ai_next = NULL;
+
+        if (res->ai_addr != NULL)
+        {
+            memcpy (res->ai_addr, addr, addrlen);
+
+            if (canonname != NULL)
+            {
+                res->ai_canonname = strdup (canonname);
+                if (res->ai_canonname != NULL)
+                    return res; /* success ! */
+            }
+            else
+                return res;
+        }
+    }
+    /* failsafe */
+    freeaddrinfo (res);
+    return NULL;
+}
+
+static struct addrinfo *
+makeipv4info (int type, int proto, u_long ip, u_short port, const char *name)
+{
+    struct sockaddr_in addr;
+
+    memset (&addr, 0, sizeof (addr));
+    addr.sin_family = AF_INET;
+# ifdef HAVE_SA_LEN
+    addr.sin_len = sizeof (addr);
+# endif
+    addr.sin_port = port;
+    addr.sin_addr.s_addr = ip;
+
+    return makeaddrinfo (AF_INET, type, proto,
+                         (struct sockaddr*)&addr, sizeof (addr), name);
+}
+
+/*
+ * getaddrinfo() non-thread-safe IPv4-only implementation
+ * Address-family-independent hostname to address resolution.
+ *
+ * This is meant for IPv6-unaware systems that do probably not provide
+ * getaddrinfo(), but still have old function gethostbyname().
+ *
+ * Only UDP and TCP over IPv4 are supported here.
+ */
+int
+getaddrinfo (const char *node, const char *service,
+             const struct addrinfo *hints, struct addrinfo **res)
+{
+    struct addrinfo *info;
+    u_long ip;
+    u_short port;
+    int protocol = 0, flags = 0;
+    const char *name = NULL;
+
+    if (hints != NULL)
+    {
+        flags = hints->ai_flags;
+
+        if (flags & ~_AI_MASK)
+            return EAI_BADFLAGS;
+        /* only accept AF_INET and AF_UNSPEC */
+        if (hints->ai_family && (hints->ai_family != AF_INET))
+            return EAI_FAMILY;
+
+        /* protocol sanity check */
+        switch (hints->ai_socktype)
+        {
+            case SOCK_STREAM:
+                protocol = IPPROTO_TCP;
+                break;
+
+            case SOCK_DGRAM:
+                protocol = IPPROTO_UDP;
+                break;
+
+#ifndef SOCK_RAW
+            case SOCK_RAW:
+#endif
+            case 0:
+                break;
+
+            default:
+                return EAI_SOCKTYPE;
+        }
+        if (hints->ai_protocol && protocol
+         && (protocol != hints->ai_protocol))
+            return EAI_SERVICE;
+    }
+
+    *res = NULL;
+
+    /* default values */
+    if (node == NULL)
+    {
+        if (flags & AI_PASSIVE)
+            ip = htonl (INADDR_ANY);
+        else
+            ip = htonl (INADDR_LOOPBACK);
+    }
+    else
+    if ((ip = inet_addr (node)) == INADDR_NONE)
+    {
+        struct hostent *entry = NULL;
+
+        /* hostname resolution */
+        if (!(flags & AI_NUMERICHOST))
+            entry = gethostbyname (node);
+
+        if (entry == NULL)
+            return gai_error_from_herrno ();
+
+        if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET))
+            return EAI_FAMILY;
+
+        ip = *((u_long *) entry->h_addr);
+        if (flags & AI_CANONNAME)
+            name = entry->h_name;
+    }
+
+    if ((flags & AI_CANONNAME) && (name == NULL))
+        name = node;
+
+    /* service resolution */
+    if (service == NULL)
+        port = 0;
+    else
+    {
+        unsigned long d;
+        char *end;
+
+        d = strtoul (service, &end, 0);
+        if (end[0] || (d > 65535u))
+            return EAI_SERVICE;
+
+        port = htons ((u_short)d);
+    }
+
+    /* building results... */
+    if ((!protocol) || (protocol == IPPROTO_UDP))
+    {
+        info = makeipv4info (SOCK_DGRAM, IPPROTO_UDP, ip, port, name);
+        if (info == NULL)
+        {
+            errno = ENOMEM;
+            return EAI_SYSTEM;
+        }
+        if (flags & AI_PASSIVE)
+            info->ai_flags |= AI_PASSIVE;
+        *res = info;
+    }
+    if ((!protocol) || (protocol == IPPROTO_TCP))
+    {
+        info = makeipv4info (SOCK_STREAM, IPPROTO_TCP, ip, port, name);
+        if (info == NULL)
+        {
+            errno = ENOMEM;
+            return EAI_SYSTEM;
+        }
+        info->ai_next = *res;
+        if (flags & AI_PASSIVE)
+            info->ai_flags |= AI_PASSIVE;
+        *res = info;
+    }
+
+    return 0;
+}
-- 
1.7.3.2

