1 files changed, 111 insertions, 0 deletions
diff --git a/src/common/ip.cpp b/src/common/ip.cpp
new file mode 100644
index 0000000..4734a8b
--- /dev/null
+++ b/src/common/ip.cpp
@@ -0,0 +1,111 @@
+#include "ip.hpp"
+//    ip.cpp - Implementation of IP address functions.
+//
+//    Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 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 General Public License
+//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "cxxstdio.hpp"
+
+#include "../poison.hpp"
+
+bool extract(XString str, IP4Address *rv)
+{
+    if (str.endswith('.'))
+        return false;
+    uint8_t buf[4];
+    if (extract(str, record<'.'>(&buf[0], &buf[1], &buf[2], &buf[3])))
+    {
+        *rv = IP4Address(buf);
+        return true;
+    }
+    return false;
+}
+
+bool extract(XString str, IP4Mask *rv)
+{
+    IP4Address a, m;
+    unsigned b;
+    XString l, r;
+    if (str.endswith('/'))
+        return false;
+    if (extract(str, record<'/'>(&l, &r)))
+    {
+        // a.b.c.d/e.f.g.h or a.b.c.d/n
+        if (!extract(l, &a))
+            return false;
+        if (extract(r, &m))
+        {
+            *rv = IP4Mask(a, m);
+            return true;
+        }
+        if (!extract(r, &b) || b > 32)
+            return false;
+    }
+    else
+    {
+        // a.b.c.d or a.b.c.d. or a.b.c. or a.b. or a.
+        if (extract(str, &a))
+        {
+            *rv = IP4Mask(a, IP4_BROADCAST);
+            return true;
+        }
+        if (!str.endswith('.'))
+            return false;
+        uint8_t d[4] {};
+        if (extract(str, record<'.'>(&d[0], &d[1], &d[2], &d[3])))
+            b = 32;
+        else if (extract(str, record<'.'>(&d[0], &d[1], &d[2])))
+            b = 24;
+        else if (extract(str, record<'.'>(&d[0], &d[1])))
+            b = 16;
+        else if (extract(str, record<'.'>(&d[0])))
+            b = 8;
+        else
+            return false;
+        a = IP4Address(d);
+    }
+    // a is set; need to construct m from b
+    if (b == 0)
+        m = IP4Address();
+    else if (b == 32)
+        m = IP4_BROADCAST;
+    else
+    {
+        uint32_t s = -1;
+        s <<= (32 - b);
+        m = IP4Address({
+                static_cast<uint8_t>(s >> 24),
+                static_cast<uint8_t>(s >> 16),
+                static_cast<uint8_t>(s >> 8),
+                static_cast<uint8_t>(s >> 0),
+        });
+    }
+    *rv = IP4Mask(a, m);
+    return true;
+}
+
+VString<15> convert_for_printf(IP4Address a_)
+{
+    const uint8_t *a = a_.bytes();
+    return STRNPRINTF(16, "%hhu.%hhu.%hhu.%hhu", a[0], a[1], a[2], a[3]);
+}
+
+VString<31> convert_for_printf(IP4Mask a)
+{
+    return STRNPRINTF(32, "%s/%s",
+            a.addr(), a.mask());
+}