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Merge pull request #181 from enginix/master

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Add support for datagram unix domain sockets
This commit is contained in:
Diego Nehab 2016-07-22 14:06:30 -03:00 committed by GitHub
commit 316a9455b9
10 changed files with 842 additions and 316 deletions
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3
src/makefile
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@ -307,6 +307,9 @@ UNIX_OBJS=\
timeout.$(O) \
io.$(O) \
usocket.$(O) \
unixtcp.$(O) \
unixudp.$(O) \
compat.$(O) \
unix.$(O)
#------

328
src/unix.c
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@ -2,329 +2,29 @@
* Unix domain socket
* LuaSocket toolkit
\*=========================================================================*/
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "auxiliar.h"
#include "socket.h"
#include "options.h"
#include "unix.h"
#include <sys/un.h>
#include "unixtcp.h"
#include "unixudp.h"
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_listen(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_shutdown(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_accept(lua_State *L);
static int meth_close(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);
static int meth_getstats(lua_State *L);
static int meth_setstats(lua_State *L);
static const char *unix_tryconnect(p_unix un, const char *path);
static const char *unix_trybind(p_unix un, const char *path);
/* unix object methods */
static luaL_Reg unix_methods[] = {
{"__gc", meth_close},
{"__tostring", auxiliar_tostring},
{"accept", meth_accept},
{"bind", meth_bind},
{"close", meth_close},
{"connect", meth_connect},
{"dirty", meth_dirty},
{"getfd", meth_getfd},
{"getstats", meth_getstats},
{"setstats", meth_setstats},
{"listen", meth_listen},
{"receive", meth_receive},
{"send", meth_send},
{"setfd", meth_setfd},
{"setoption", meth_setoption},
{"setpeername", meth_connect},
{"setsockname", meth_bind},
{"settimeout", meth_settimeout},
{"shutdown", meth_shutdown},
{NULL, NULL}
};
/* socket option handlers */
static t_opt optset[] = {
{"keepalive", opt_set_keepalive},
{"reuseaddr", opt_set_reuseaddr},
{"linger", opt_set_linger},
{NULL, NULL}
/*-------------------------------------------------------------------------*\
* Modules and functions
\*-------------------------------------------------------------------------*/
static const luaL_Reg mod[] = {
{"tcp", unixtcp_open},
{"udp", unixudp_open},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int luaopen_socket_unix(lua_State *L) {
/* create classes */
auxiliar_newclass(L, "unix{master}", unix_methods);
auxiliar_newclass(L, "unix{client}", unix_methods);
auxiliar_newclass(L, "unix{server}", unix_methods);
/* create class groups */
auxiliar_add2group(L, "unix{master}", "unix{any}");
auxiliar_add2group(L, "unix{client}", "unix{any}");
auxiliar_add2group(L, "unix{server}", "unix{any}");
/* return the function instead of the 'socket' table */
lua_pushcfunction(L, global_create);
return 1;
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Just call buffered IO methods
\*-------------------------------------------------------------------------*/
static int meth_send(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
return buffer_meth_send(L, &un->buf);
}
static int meth_receive(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
return buffer_meth_receive(L, &un->buf);
}
static int meth_getstats(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
return buffer_meth_getstats(L, &un->buf);
}
static int meth_setstats(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
return buffer_meth_setstats(L, &un->buf);
}
/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
return opt_meth_setoption(L, optset, &un->sock);
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_getfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
lua_pushnumber(L, (int) un->sock);
return 1;
}
/* this is very dangerous, but can be handy for those that are brave enough */
static int meth_setfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
un->sock = (t_socket) luaL_checknumber(L, 2);
return 0;
}
static int meth_dirty(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
lua_pushboolean(L, !buffer_isempty(&un->buf));
return 1;
}
/*-------------------------------------------------------------------------*\
* Waits for and returns a client object attempting connection to the
* server object
\*-------------------------------------------------------------------------*/
static int meth_accept(lua_State *L) {
p_unix server = (p_unix) auxiliar_checkclass(L, "unix{server}", 1);
p_timeout tm = timeout_markstart(&server->tm);
t_socket sock;
int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
/* if successful, push client socket */
if (err == IO_DONE) {
p_unix clnt = (p_unix) lua_newuserdata(L, sizeof(t_unix));
auxiliar_setclass(L, "unix{client}", -1);
/* initialize structure fields */
socket_setnonblocking(&sock);
clnt->sock = sock;
io_init(&clnt->io, (p_send)socket_send, (p_recv)socket_recv,
(p_error) socket_ioerror, &clnt->sock);
timeout_init(&clnt->tm, -1, -1);
buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
return 1;
} else {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
}
/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unix_trybind(p_unix un, const char *path) {
struct sockaddr_un local;
size_t len = strlen(path);
int err;
if (len >= sizeof(local.sun_path)) return "path too long";
memset(&local, 0, sizeof(local));
strcpy(local.sun_path, path);
local.sun_family = AF_UNIX;
#ifdef UNIX_HAS_SUN_LEN
local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
+ len + 1;
err = socket_bind(&un->sock, (SA *) &local, local.sun_len);
#else
err = socket_bind(&un->sock, (SA *) &local,
sizeof(local.sun_family) + len);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
}
static int meth_bind(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unix_trybind(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Turns a master unix object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unix_tryconnect(p_unix un, const char *path)
int luaopen_socket_unix(lua_State *L)
{
struct sockaddr_un remote;
int err;
size_t len = strlen(path);
if (len >= sizeof(remote.sun_path)) return "path too long";
memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
remote.sun_family = AF_UNIX;
timeout_markstart(&un->tm);
#ifdef UNIX_HAS_SUN_LEN
remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
+ len + 1;
err = socket_connect(&un->sock, (SA *) &remote, remote.sun_len, &un->tm);
#else
err = socket_connect(&un->sock, (SA *) &remote,
sizeof(remote.sun_family) + len, &un->tm);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
int i;
lua_newtable(L);
for (i = 0; mod[i].name; i++) mod[i].func(L);
return 1;
}
static int meth_connect(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unix_tryconnect(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* turn master object into a client object */
auxiliar_setclass(L, "unix{client}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
socket_destroy(&un->sock);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Puts the sockt in listen mode
\*-------------------------------------------------------------------------*/
static int meth_listen(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
int backlog = (int) luaL_optnumber(L, 2, 32);
int err = socket_listen(&un->sock, backlog);
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
/* turn master object into a server object */
auxiliar_setclass(L, "unix{server}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Shuts the connection down partially
\*-------------------------------------------------------------------------*/
static int meth_shutdown(lua_State *L)
{
/* SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, so we can use method index directly */
static const char* methods[] = { "receive", "send", "both", NULL };
p_unix tcp = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
int how = luaL_checkoption(L, 2, "both", methods);
socket_shutdown(&tcp->sock, how);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
return timeout_meth_settimeout(L, &un->tm);
}
/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master unix object
\*-------------------------------------------------------------------------*/
static int global_create(lua_State *L) {
t_socket sock;
int err = socket_create(&sock, AF_UNIX, SOCK_STREAM, 0);
/* try to allocate a system socket */
if (err == IO_DONE) {
/* allocate unix object */
p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
/* set its type as master object */
auxiliar_setclass(L, "unix{master}", -1);
/* initialize remaining structure fields */
socket_setnonblocking(&sock);
un->sock = sock;
io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
(p_error) socket_ioerror, &un->sock);
timeout_init(&un->tm, -1, -1);
buffer_init(&un->buf, &un->io, &un->tm);
return 1;
} else {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
}

357
src/unixtcp.c Normal file
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@ -0,0 +1,357 @@
/*=========================================================================*\
* Unix domain socket tcp sub module
* LuaSocket toolkit
\*=========================================================================*/
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "compat.h"
#include "auxiliar.h"
#include "socket.h"
#include "options.h"
#include "unixtcp.h"
#include <sys/un.h>
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_listen(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_shutdown(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_accept(lua_State *L);
static int meth_close(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);
static int meth_getstats(lua_State *L);
static int meth_setstats(lua_State *L);
static int meth_getsockname(lua_State *L);
static const char *unixtcp_tryconnect(p_unix un, const char *path);
static const char *unixtcp_trybind(p_unix un, const char *path);
/* unixtcp object methods */
static luaL_Reg unixtcp_methods[] = {
{"__gc", meth_close},
{"__tostring", auxiliar_tostring},
{"accept", meth_accept},
{"bind", meth_bind},
{"close", meth_close},
{"connect", meth_connect},
{"dirty", meth_dirty},
{"getfd", meth_getfd},
{"getstats", meth_getstats},
{"setstats", meth_setstats},
{"listen", meth_listen},
{"receive", meth_receive},
{"send", meth_send},
{"setfd", meth_setfd},
{"setoption", meth_setoption},
{"setpeername", meth_connect},
{"setsockname", meth_bind},
{"getsockname", meth_getsockname},
{"settimeout", meth_settimeout},
{"shutdown", meth_shutdown},
{NULL, NULL}
};
/* socket option handlers */
static t_opt optset[] = {
{"keepalive", opt_set_keepalive},
{"reuseaddr", opt_set_reuseaddr},
{"linger", opt_set_linger},
{NULL, NULL}
};
/* functions in library namespace */
static luaL_Reg func[] = {
{"tcp", global_create},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int unixtcp_open(lua_State *L)
{
/* create classes */
auxiliar_newclass(L, "unixtcp{master}", unixtcp_methods);
auxiliar_newclass(L, "unixtcp{client}", unixtcp_methods);
auxiliar_newclass(L, "unixtcp{server}", unixtcp_methods);
/* create class groups */
auxiliar_add2group(L, "unixtcp{master}", "unixtcp{any}");
auxiliar_add2group(L, "unixtcp{client}", "unixtcp{any}");
auxiliar_add2group(L, "unixtcp{server}", "unixtcp{any}");
luaL_setfuncs(L, func, 0);
return 0;
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Just call buffered IO methods
\*-------------------------------------------------------------------------*/
static int meth_send(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{client}", 1);
return buffer_meth_send(L, &un->buf);
}
static int meth_receive(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{client}", 1);
return buffer_meth_receive(L, &un->buf);
}
static int meth_getstats(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{client}", 1);
return buffer_meth_getstats(L, &un->buf);
}
static int meth_setstats(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{client}", 1);
return buffer_meth_setstats(L, &un->buf);
}
/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
return opt_meth_setoption(L, optset, &un->sock);
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_getfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
lua_pushnumber(L, (int) un->sock);
return 1;
}
/* this is very dangerous, but can be handy for those that are brave enough */
static int meth_setfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
un->sock = (t_socket) luaL_checknumber(L, 2);
return 0;
}
static int meth_dirty(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
lua_pushboolean(L, !buffer_isempty(&un->buf));
return 1;
}
/*-------------------------------------------------------------------------*\
* Waits for and returns a client object attempting connection to the
* server object
\*-------------------------------------------------------------------------*/
static int meth_accept(lua_State *L) {
p_unix server = (p_unix) auxiliar_checkclass(L, "unixtcp{server}", 1);
p_timeout tm = timeout_markstart(&server->tm);
t_socket sock;
int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
/* if successful, push client socket */
if (err == IO_DONE) {
p_unix clnt = (p_unix) lua_newuserdata(L, sizeof(t_unix));
auxiliar_setclass(L, "unixtcp{client}", -1);
/* initialize structure fields */
socket_setnonblocking(&sock);
clnt->sock = sock;
io_init(&clnt->io, (p_send)socket_send, (p_recv)socket_recv,
(p_error) socket_ioerror, &clnt->sock);
timeout_init(&clnt->tm, -1, -1);
buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
return 1;
} else {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
}
/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unixtcp_trybind(p_unix un, const char *path) {
struct sockaddr_un local;
size_t len = strlen(path);
int err;
if (len >= sizeof(local.sun_path)) return "path too long";
memset(&local, 0, sizeof(local));
strcpy(local.sun_path, path);
local.sun_family = AF_UNIX;
#ifdef UNIX_HAS_SUN_LEN
local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
+ len + 1;
err = socket_bind(&un->sock, (SA *) &local, local.sun_len);
#else
err = socket_bind(&un->sock, (SA *) &local,
sizeof(local.sun_family) + len);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
}
static int meth_bind(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{master}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixtcp_trybind(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
static int meth_getsockname(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
struct sockaddr_un peer = {0};
socklen_t peer_len = sizeof(peer);
if (getsockname(un->sock, (SA *) &peer, &peer_len) < 0) {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(errno));
return 2;
}
lua_pushstring(L, peer.sun_path);
return 1;
}
/*-------------------------------------------------------------------------*\
* Turns a master unixtcp object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unixtcp_tryconnect(p_unix un, const char *path)
{
struct sockaddr_un remote;
int err;
size_t len = strlen(path);
if (len >= sizeof(remote.sun_path)) return "path too long";
memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
remote.sun_family = AF_UNIX;
timeout_markstart(&un->tm);
#ifdef UNIX_HAS_SUN_LEN
remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
+ len + 1;
err = socket_connect(&un->sock, (SA *) &remote, remote.sun_len, &un->tm);
#else
err = socket_connect(&un->sock, (SA *) &remote,
sizeof(remote.sun_family) + len, &un->tm);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
}
static int meth_connect(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{master}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixtcp_tryconnect(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* turn master object into a client object */
auxiliar_setclass(L, "unixtcp{client}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
socket_destroy(&un->sock);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Puts the sockt in listen mode
\*-------------------------------------------------------------------------*/
static int meth_listen(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixtcp{master}", 1);
int backlog = (int) luaL_optnumber(L, 2, 32);
int err = socket_listen(&un->sock, backlog);
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
/* turn master object into a server object */
auxiliar_setclass(L, "unixtcp{server}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Shuts the connection down partially
\*-------------------------------------------------------------------------*/
static int meth_shutdown(lua_State *L)
{
/* SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, so we can use method index directly */
static const char* methods[] = { "receive", "send", "both", NULL };
p_unix tcp = (p_unix) auxiliar_checkclass(L, "unixtcp{client}", 1);
int how = luaL_checkoption(L, 2, "both", methods);
socket_shutdown(&tcp->sock, how);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixtcp{any}", 1);
return timeout_meth_settimeout(L, &un->tm);
}
/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master unixtcp object
\*-------------------------------------------------------------------------*/
static int global_create(lua_State *L) {
t_socket sock;
int err = socket_create(&sock, AF_UNIX, SOCK_STREAM, 0);
/* try to allocate a system socket */
if (err == IO_DONE) {
/* allocate unixtcp object */
p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
/* set its type as master object */
auxiliar_setclass(L, "unixtcp{master}", -1);
/* initialize remaining structure fields */
socket_setnonblocking(&sock);
un->sock = sock;
io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
(p_error) socket_ioerror, &un->sock);
timeout_init(&un->tm, -1, -1);
buffer_init(&un->buf, &un->io, &un->tm);
return 1;
} else {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
}

21
src/unixtcp.h Normal file
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@ -0,0 +1,21 @@
#ifndef UNIXTCP_H
#define UNIXTCP_H
/*=========================================================================*\
* UNIX TCP object
* LuaSocket toolkit
*
* The unixtcp.h module is basicly a glue that puts together modules buffer.h,
* timeout.h socket.h and inet.h to provide the LuaSocket UNIX TCP (AF_UNIX,
* SOCK_STREAM) support.
*
* Three classes are defined: master, client and server. The master class is
* a newly created unixtcp object, that has not been bound or connected. Server
* objects are unixtcp objects bound to some local address. Client objects are
* unixtcp objects either connected to some address or returned by the accept
* method of a server object.
\*=========================================================================*/
#include "unix.h"
int unixtcp_open(lua_State *L);
#endif /* UNIXTCP_H */

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/*=========================================================================*\
* Unix domain socket udp submodule
* LuaSocket toolkit
\*=========================================================================*/
#include <string.h>
#include <stdlib.h>
#include "lua.h"
#include "lauxlib.h"
#include "compat.h"
#include "auxiliar.h"
#include "socket.h"
#include "options.h"
#include "unix.h"
#include <sys/un.h>
#define UNIXUDP_DATAGRAMSIZE 8192
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_close(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_gettimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);
static int meth_receivefrom(lua_State *L);
static int meth_sendto(lua_State *L);
static int meth_getsockname(lua_State *L);
static const char *unixudp_tryconnect(p_unix un, const char *path);
static const char *unixudp_trybind(p_unix un, const char *path);
/* unixudp object methods */
static luaL_Reg unixudp_methods[] = {
{"__gc", meth_close},
{"__tostring", auxiliar_tostring},
{"bind", meth_bind},
{"close", meth_close},
{"connect", meth_connect},
{"dirty", meth_dirty},
{"getfd", meth_getfd},
{"send", meth_send},
{"sendto", meth_sendto},
{"receive", meth_receive},
{"receivefrom", meth_receivefrom},
{"setfd", meth_setfd},
{"setoption", meth_setoption},
{"setpeername", meth_connect},
{"setsockname", meth_bind},
{"getsockname", meth_getsockname},
{"settimeout", meth_settimeout},
{"gettimeout", meth_gettimeout},
{NULL, NULL}
};
/* socket option handlers */
static t_opt optset[] = {
{"reuseaddr", opt_set_reuseaddr},
{NULL, NULL}
};
/* functions in library namespace */
static luaL_Reg func[] = {
{"udp", global_create},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int unixudp_open(lua_State *L)
{
/* create classes */
auxiliar_newclass(L, "unixudp{connected}", unixudp_methods);
auxiliar_newclass(L, "unixudp{unconnected}", unixudp_methods);
/* create class groups */
auxiliar_add2group(L, "unixudp{connected}", "unixudp{any}");
auxiliar_add2group(L, "unixudp{unconnected}", "unixudp{any}");
auxiliar_add2group(L, "unixudp{connected}", "select{able}");
auxiliar_add2group(L, "unixudp{unconnected}", "select{able}");
luaL_setfuncs(L, func, 0);
return 0;
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
static const char *unixudp_strerror(int err)
{
/* a 'closed' error on an unconnected means the target address was not
* accepted by the transport layer */
if (err == IO_CLOSED) return "refused";
else return socket_strerror(err);
}
static int meth_send(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixudp{connected}", 1);
p_timeout tm = &un->tm;
size_t count, sent = 0;
int err;
const char *data = luaL_checklstring(L, 2, &count);
timeout_markstart(tm);
err = socket_send(&un->sock, data, count, &sent, tm);
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, unixudp_strerror(err));
return 2;
}
lua_pushnumber(L, (lua_Number) sent);
return 1;
}
/*-------------------------------------------------------------------------*\
* Send data through unconnected unixudp socket
\*-------------------------------------------------------------------------*/
static int meth_sendto(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixudp{unconnected}", 1);
size_t count, sent = 0;
const char *data = luaL_checklstring(L, 2, &count);
const char *path = luaL_checkstring(L, 3);
p_timeout tm = &un->tm;
int err;
struct sockaddr_un remote;
size_t len = strlen(path);
if (len >= sizeof(remote.sun_path)) {
lua_pushnil(L);
lua_pushstring(L, "path too long");
return 2;
}
memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
remote.sun_family = AF_UNIX;
timeout_markstart(tm);
#ifdef UNIX_HAS_SUN_LEN
remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
+ len + 1;
err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote, remote.sun_len, tm);
#else
err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote,
sizeof(remote.sun_family) + len, tm);
#endif
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, unixudp_strerror(err));
return 2;
}
lua_pushnumber(L, (lua_Number) sent);
return 1;
}
static int meth_receive(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
char buf[UNIXUDP_DATAGRAMSIZE];
size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
int err;
p_timeout tm = &un->tm;
timeout_markstart(tm);
if (!dgram) {
lua_pushnil(L);
lua_pushliteral(L, "out of memory");
return 2;
}
err = socket_recv(&un->sock, dgram, wanted, &got, tm);
/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
if (err != IO_DONE && err != IO_CLOSED) {
lua_pushnil(L);
lua_pushstring(L, unixudp_strerror(err));
if (wanted > sizeof(buf)) free(dgram);
return 2;
}
lua_pushlstring(L, dgram, got);
if (wanted > sizeof(buf)) free(dgram);
return 1;
}
/*-------------------------------------------------------------------------*\
* Receives data and sender from a UDP socket
\*-------------------------------------------------------------------------*/
static int meth_receivefrom(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkclass(L, "unixudp{unconnected}", 1);
char buf[UNIXUDP_DATAGRAMSIZE];
size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
struct sockaddr_un addr;
socklen_t addr_len = sizeof(addr);
int err;
p_timeout tm = &un->tm;
timeout_markstart(tm);
if (!dgram) {
lua_pushnil(L);
lua_pushliteral(L, "out of memory");
return 2;
}
err = socket_recvfrom(&un->sock, dgram, wanted, &got, (SA *) &addr,
&addr_len, tm);
/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
if (err != IO_DONE && err != IO_CLOSED) {
lua_pushnil(L);
lua_pushstring(L, unixudp_strerror(err));
if (wanted > sizeof(buf)) free(dgram);
return 2;
}
lua_pushlstring(L, dgram, got);
/* the path may be empty, when client send without bind */
lua_pushstring(L, addr.sun_path);
if (wanted > sizeof(buf)) free(dgram);
return 2;
}
/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
return opt_meth_setoption(L, optset, &un->sock);
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_getfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
lua_pushnumber(L, (int) un->sock);
return 1;
}
/* this is very dangerous, but can be handy for those that are brave enough */
static int meth_setfd(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
un->sock = (t_socket) luaL_checknumber(L, 2);
return 0;
}
static int meth_dirty(lua_State *L) {
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
(void) un;
lua_pushboolean(L, 0);
return 1;
}
/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unixudp_trybind(p_unix un, const char *path) {
struct sockaddr_un local;
size_t len = strlen(path);
int err;
if (len >= sizeof(local.sun_path)) return "path too long";
memset(&local, 0, sizeof(local));
strcpy(local.sun_path, path);
local.sun_family = AF_UNIX;
#ifdef UNIX_HAS_SUN_LEN
local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
+ len + 1;
err = socket_bind(&un->sock, (SA *) &local, local.sun_len);
#else
err = socket_bind(&un->sock, (SA *) &local,
sizeof(local.sun_family) + len);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
}
static int meth_bind(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixudp{unconnected}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixudp_trybind(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
static int meth_getsockname(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
struct sockaddr_un peer = {0};
socklen_t peer_len = sizeof(peer);
if (getsockname(un->sock, (SA *) &peer, &peer_len) < 0) {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(errno));
return 2;
}
lua_pushstring(L, peer.sun_path);
return 1;
}
/*-------------------------------------------------------------------------*\
* Turns a master unixudp object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unixudp_tryconnect(p_unix un, const char *path)
{
struct sockaddr_un remote;
int err;
size_t len = strlen(path);
if (len >= sizeof(remote.sun_path)) return "path too long";
memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
remote.sun_family = AF_UNIX;
timeout_markstart(&un->tm);
#ifdef UNIX_HAS_SUN_LEN
remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
+ len + 1;
err = socket_connect(&un->sock, (SA *) &remote, remote.sun_len, &un->tm);
#else
err = socket_connect(&un->sock, (SA *) &remote,
sizeof(remote.sun_family) + len, &un->tm);
#endif
if (err != IO_DONE) socket_destroy(&un->sock);
return socket_strerror(err);
}
static int meth_connect(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixudp_tryconnect(un, path);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* turn unconnected object into a connected object */
auxiliar_setclass(L, "unixudp{connected}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
socket_destroy(&un->sock);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
return timeout_meth_settimeout(L, &un->tm);
}
static int meth_gettimeout(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkgroup(L, "unixudp{any}", 1);
return timeout_meth_gettimeout(L, &un->tm);
}
/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master unixudp object
\*-------------------------------------------------------------------------*/
static int global_create(lua_State *L)
{
t_socket sock;
int err = socket_create(&sock, AF_UNIX, SOCK_DGRAM, 0);
/* try to allocate a system socket */
if (err == IO_DONE) {
/* allocate unixudp object */
p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
/* set its type as master object */
auxiliar_setclass(L, "unixudp{unconnected}", -1);
/* initialize remaining structure fields */
socket_setnonblocking(&sock);
un->sock = sock;
io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
(p_error) socket_ioerror, &un->sock);
timeout_init(&un->tm, -1, -1);
buffer_init(&un->buf, &un->io, &un->tm);
return 1;
} else {
lua_pushnil(L);
lua_pushstring(L, socket_strerror(err));
return 2;
}
}

20
src/unixudp.h Normal file
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#ifndef UNIXUDP_H
#define UNIXUDP_H
/*=========================================================================*\
* UDP object
* LuaSocket toolkit
*
* The udp.h module provides LuaSocket with support for UDP protocol
* (AF_INET, SOCK_DGRAM).
*
* Two classes are defined: connected and unconnected. UDP objects are
* originally unconnected. They can be "connected" to a given address
* with a call to the setpeername function. The same function can be used to
* break the connection.
\*=========================================================================*/
#include "unix.h"
int unixudp_open(lua_State *L);
#endif /* UNIXUDP_H */

2
test/unixclnt.lua → test/unixtcpclnt.lua
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@ -1,6 +1,6 @@
socket = require"socket"
socket.unix = require"socket.unix"
c = assert(socket.unix())
c = assert(socket.unix.tcp())
assert(c:connect("/tmp/foo"))
while 1 do
local l = io.read()

2
test/unixsrvr.lua → test/unixtcpsrvr.lua
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@ -1,6 +1,6 @@
socket = require"socket"
socket.unix = require"socket.unix"
u = assert(socket.unix())
u = assert(socket.unix.tcp())
assert(u:bind("/tmp/foo"))
assert(u:listen())
c = assert(u:accept())

9
test/unixudpclnt.lua Normal file
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@ -0,0 +1,9 @@
socket = require"socket"
socket.unix = require"socket.unix"
c = assert(socket.unix.udp())
c:bind("/tmp/bar")
while 1 do
local l = io.read("*l")
assert(c:sendto(l, "/tmp/foo"))
print(assert(c:receivefrom()))
end

9
test/unixudpsrvr.lua Normal file
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@ -0,0 +1,9 @@
socket = require"socket"
socket.unix = require"socket.unix"
u = assert(socket.unix.udp())
assert(u:bind("/tmp/foo"))
while 1 do
x, r = assert(u:receivefrom())
print(x, r)
assert(u:sendto(">" .. x, r))
end