1 files changed, 355 insertions, 0 deletions

diff --git a/src/unixstream.c b/src/unixstream.c
new file mode 100644
index 0000000..02aced9
--- /dev/null
+++ b/src/unixstream.c
@@ -0,0 +1,355 @@
+/*=========================================================================*\
+* Unix domain socket stream sub module
+* LuaSocket toolkit
+\*=========================================================================*/
+#include "luasocket.h"
+
+#include "auxiliar.h"
+#include "socket.h"
+#include "options.h"
+#include "unixstream.h"
+
+#include <string.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 *unixstream_tryconnect(p_unix un, const char *path);
+static const char *unixstream_trybind(p_unix un, const char *path);
+
+/* unixstream object methods */
+static luaL_Reg unixstream_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[] = {
+    {"stream", global_create},
+    {NULL, NULL}
+};
+
+/*-------------------------------------------------------------------------*\
+* Initializes module
+\*-------------------------------------------------------------------------*/
+int unixstream_open(lua_State *L)
+{
+    /* create classes */
+    auxiliar_newclass(L, "unixstream{master}", unixstream_methods);
+    auxiliar_newclass(L, "unixstream{client}", unixstream_methods);
+    auxiliar_newclass(L, "unixstream{server}", unixstream_methods);
+
+    /* create class groups */
+    auxiliar_add2group(L, "unixstream{master}", "unixstream{any}");
+    auxiliar_add2group(L, "unixstream{client}", "unixstream{any}");
+    auxiliar_add2group(L, "unixstream{server}", "unixstream{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, "unixstream{client}", 1);
+    return buffer_meth_send(L, &un->buf);
+}
+
+static int meth_receive(lua_State *L) {
+    p_unix un = (p_unix) auxiliar_checkclass(L, "unixstream{client}", 1);
+    return buffer_meth_receive(L, &un->buf);
+}
+
+static int meth_getstats(lua_State *L) {
+    p_unix un = (p_unix) auxiliar_checkclass(L, "unixstream{client}", 1);
+    return buffer_meth_getstats(L, &un->buf);
+}
+
+static int meth_setstats(lua_State *L) {
+    p_unix un = (p_unix) auxiliar_checkclass(L, "unixstream{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, "unixstream{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, "unixstream{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, "unixstream{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, "unixstream{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, "unixstream{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, "unixstream{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 *unixstream_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, "unixstream{master}", 1);
+    const char *path =  luaL_checkstring(L, 2);
+    const char *err = unixstream_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, "unixstream{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 unixstream object into a client object.
+\*-------------------------------------------------------------------------*/
+static const char *unixstream_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, "unixstream{master}", 1);
+    const char *path =  luaL_checkstring(L, 2);
+    const char *err = unixstream_tryconnect(un, path);
+    if (err) {
+        lua_pushnil(L);
+        lua_pushstring(L, err);
+        return 2;
+    }
+    /* turn master object into a client object */
+    auxiliar_setclass(L, "unixstream{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, "unixstream{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, "unixstream{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, "unixstream{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 stream = (p_unix) auxiliar_checkclass(L, "unixstream{client}", 1);
+    int how = luaL_checkoption(L, 2, "both", methods);
+    socket_shutdown(&stream->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, "unixstream{any}", 1);
+    return timeout_meth_settimeout(L, &un->tm);
+}
+
+/*=========================================================================*\
+* Library functions
+\*=========================================================================*/
+/*-------------------------------------------------------------------------*\
+* Creates a master unixstream 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 unixstream object */
+        p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
+        /* set its type as master object */
+        auxiliar_setclass(L, "unixstream{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;
+    }
+}