From c20b177f6f1a5542d750d30ffdc96e18c5090d24 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <esmil@mailme.dk>
Date: Wed, 16 Jan 2013 11:41:14 +0100
Subject: io: add stream:getpeer()

---
 lem/io/core.c   |  7 ++++-
 lem/io/stream.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/htest.lua  |  9 ++++++-
 3 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/lem/io/core.c b/lem/io/core.c
index 867c745..459fa2a 100644
--- a/lem/io/core.c
+++ b/lem/io/core.c
@@ -16,6 +16,7 @@
  * License along with LEM.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
@@ -32,6 +33,7 @@
 
 #if defined(__FreeBSD__) || defined(__APPLE__)
 #include <sys/un.h>
+#include <sys/ucred.h>
 #include <netinet/in.h>
 #ifndef UNIX_PATH_MAX
 #define UNIX_PATH_MAX 104
@@ -319,6 +321,9 @@ luaopen_lem_io_core(lua_State *L)
 	/* mt.uncork = <stream_uncork> */
 	lua_pushcfunction(L, stream_uncork);
 	lua_setfield(L, -2, "uncork");
+	/* mt.getpeer = <stream_getpeer> */
+	lua_pushcfunction(L, stream_getpeer);
+	lua_setfield(L, -2, "getpeer");
 	/* mt.sendfile = <stream_sendfile> */
 	lua_pushcfunction(L, stream_sendfile);
 	lua_setfield(L, -2, "sendfile");
@@ -402,7 +407,7 @@ luaopen_lem_io_core(lua_State *L)
 	lua_getfield(L, -2, "Server"); /* upvalue 1 = Server */
 	lua_pushcclosure(L, unix_listen, 1);
 	lua_setfield(L, -2, "listen");
-	/* insert the tcp table */
+	/* insert the unix table */
 	lua_setfield(L, -2, "unix");
 
 	return 1;
diff --git a/lem/io/stream.c b/lem/io/stream.c
index b988278..1c37eaa 100644
--- a/lem/io/stream.c
+++ b/lem/io/stream.c
@@ -325,6 +325,87 @@ stream_uncork(lua_State *T)
 	return stream_setcork(T, 0);
 }
 
+static int
+stream_getpeer(lua_State *T)
+{
+	struct stream *s;
+	union {
+		struct sockaddr all;
+		struct sockaddr_in in;
+		struct sockaddr_in6 in6;
+	} addr;
+	socklen_t len;
+
+	luaL_checktype(T, 1, LUA_TUSERDATA);
+	s = lua_touserdata(T, 1);
+	if (!s->open)
+		return io_closed(T);
+
+	len = sizeof(addr);
+	if (getpeername(s->r.fd, &addr.all, &len))
+		return io_strerror(T, errno);
+
+	switch (addr.all.sa_family) {
+	case AF_UNIX: {
+#if defined(__FreeBSD__) || defined(__APPLE__)
+			struct xucred cred;
+
+			len = sizeof(struct xucred);
+			if (getsockopt(s->r.fd, 0, LOCAL_PEERCRED, &cred, &len))
+				return io_strerror(T, errno);
+
+			if (len != sizeof(struct xucred) ||
+					cred.cr_version != XUCRED_VERSION) {
+				lua_pushnil(T);
+				lua_pushliteral(T, "version mismatch");
+				return 2;
+			}
+
+			lua_pushliteral(T, "*unix");
+			lua_pushnumber(T, cred.cr_uid);
+			lua_pushnumber(T, cred.cr_gid);
+#else
+			struct ucred cred;
+
+			len = sizeof(struct ucred);
+			if (getsockopt(s->r.fd, SOL_SOCKET, SO_PEERCRED, &cred, &len))
+				return io_strerror(T, errno);
+
+			lua_pushliteral(T, "*unix");
+			lua_pushnumber(T, cred.uid);
+			lua_pushnumber(T, cred.gid);
+#endif
+			return 3;
+		}
+
+	case AF_INET: {
+			char buf[INET_ADDRSTRLEN];
+
+			if (inet_ntop(addr.in.sin_family, &addr.in.sin_addr,
+						buf, sizeof(buf)) == NULL)
+				return io_strerror(T, errno);
+
+			lua_pushstring(T, buf);
+			lua_pushnumber(T, ntohs(addr.in.sin_port));
+			return 2;
+		}
+
+	case AF_INET6: {
+			char buf[INET6_ADDRSTRLEN];
+
+			if (inet_ntop(addr.in6.sin6_family, &addr.in6.sin6_addr,
+						buf, sizeof(buf)) == NULL)
+				return io_strerror(T, errno);
+
+			lua_pushstring(T, buf);
+			lua_pushnumber(T, ntohs(addr.in6.sin6_port));
+			return 2;
+		}
+	}
+
+	return io_strerror(T, EINVAL);
+}
+
 struct sfhandle {
 	struct lem_async a;
 	struct stream *s;
diff --git a/test/htest.lua b/test/htest.lua
index 2be8e6c..a94e4c6 100755
--- a/test/htest.lua
+++ b/test/htest.lua
@@ -21,10 +21,12 @@ package.path = '?.lua'
 package.cpath = '?.so'
 
 local utils    = require 'lem.utils'
+local io       = require 'lem.io'
 local hathaway = require 'lem.hathaway'
 hathaway.import()
 
 GET('/', function(req, res)
+	print(req.client:getpeer())
 	res.status = 302
 	res.headers['Location'] = '/dump'
 end)
@@ -145,7 +147,12 @@ GETM('^/hello/([^/]+)$', function(req, res, name)
 end)
 
 hathaway.debug = print
-Hathaway('*', arg[1] or 8080)
+if arg[1] == 'socket' then
+	local sock = assert(io.unix.listen('socket', 666))
+	Hathaway(sock)
+else
+	Hathaway('*', arg[1] or '8080')
+end
 utils.exit(0) -- otherwise open connections will keep us running
 
 -- vim: syntax=lua ts=2 sw=2 noet:
-- 
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