gethostbyname initial support

1 files changed, 43 insertions, 0 deletions

diff --git a/src/library.js b/src/library.js
index d072d946..5d97b41f 100644
--- a/src/library.js
+++ b/src/library.js
@@ -6344,6 +6344,49 @@ LibraryManager.library = {
   },
 
   // ==========================================================================
+  // netdb.h
+  // ==========================================================================
+
+  // All we can do is alias names to ips. you give this a name, it returns an
+  // "ip" that we later know to use as a name. There is no way to do actual
+  // name resolving clientside in a browser.
+  // we do the aliasing in 172.29.*.*, giving us 65536 possibilities
+  // note: lots of leaking here!
+  gethostbyname: function(name) {
+    name = Pointer_stringify(name);
+    if (!_gethostbyname.hostent_layout) {
+      _gethostbyname.hostent_layout = Runtime.generateStructInfo([
+        ['i8*', 'h_name'],
+        ['i8**', 'h_aliases'],
+        ['i32', 'h_addrtype'],
+        ['i32', 'h_length'],
+        ['i8**', 'h_addr_list'],
+      ]);
+      _gethostbyname.table = {};
+      _gethostbyname.id = 0;
+    }
+    var id = _gethostbyname.id++;
+    assert(id < 65535);
+    _gethostbyname.table[id] = name;
+    // generate hostent
+    var ret = _malloc(_gethostbyname.hostent_layout.__size__);
+    var nameBuf = _malloc(name.length+1);
+    writeStringToMemory(name, nameBuf);
+    setValue(ret+_gethostbyname.hostent_layout.h_name, nameBuf, 'i8*');
+    var aliasesBuf = _malloc(4);
+    setValue(aliasesBuf, 0, 'i8*');
+    setValue(ret+_gethostbyname.hostent_layout.h_aliases, aliasesBuf, 'i8**');
+    setValue(ret+_gethostbyname.hostent_layout.h_addrtype, {{{ cDefine("AF_INET") }}}, 'i32');
+    setValue(ret+_gethostbyname.hostent_layout.h_length, 4, 'i32');
+    var addrListBuf = _malloc(12);
+    setValue(addrListBuf, addrListBuf+8, 'i32*');
+    setValue(addrListBuf+4, 0, 'i32*');
+    setValue(addrListBuf+8, 172 | (29 << 8) | ((id & 0xff) << 16) | ((id & 0xff00) << 24), 'i32');
+    setValue(ret+_gethostbyname.hostent_layout.h_addr_list, addrListBuf, 'i8**');
+    return ret;
+  },
+
+  // ==========================================================================
   // sockets
   // ==========================================================================