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fix(unix): Pass correct path length for abstract sockets (#430)
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@Zash
Zash authored May 24, 2024
1 parent 93eef50 commit e3ca4a7
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Showing 2 changed files with 42 additions and 41 deletions.
59 changes: 30 additions & 29 deletions src/unixdgram.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -16,13 +16,6 @@

#define UNIXDGRAM_DATAGRAMSIZE 8192

/* provide a SUN_LEN macro if sys/un.h doesn't (e.g. Android) */
#ifndef SUN_LEN
#define SUN_LEN(ptr) \
((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+ strlen ((ptr)->sun_path))
#endif

/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
Expand All @@ -42,8 +35,8 @@ static int meth_receivefrom(lua_State *L);
static int meth_sendto(lua_State *L);
static int meth_getsockname(lua_State *L);

static const char *unixdgram_tryconnect(p_unix un, const char *path);
static const char *unixdgram_trybind(p_unix un, const char *path);
static const char *unixdgram_tryconnect(p_unix un, const char *path, size_t len);
static const char *unixdgram_trybind(p_unix un, const char *path, size_t len);

/* unixdgram object methods */
static luaL_Reg unixdgram_methods[] = {
Expand Down Expand Up @@ -133,13 +126,12 @@ static int meth_send(lua_State *L)
static int meth_sendto(lua_State *L)
{
p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
size_t count, sent = 0;
size_t count, sent, len = 0;
const char *data = luaL_checklstring(L, 2, &count);
const char *path = luaL_checkstring(L, 3);
const char *path = luaL_checklstring(L, 3, &len);
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);
Expand All @@ -148,7 +140,7 @@ static int meth_sendto(lua_State *L)
}

memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
memcpy(remote.sun_path, path, len);
remote.sun_family = AF_UNIX;
timeout_markstart(tm);
#ifdef UNIX_HAS_SUN_LEN
Expand Down Expand Up @@ -264,27 +256,32 @@ static int meth_dirty(lua_State *L) {
/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unixdgram_trybind(p_unix un, const char *path) {
static const char *unixdgram_trybind(p_unix un, const char *path, size_t len) {
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);
memcpy(local.sun_path, path, len);
local.sun_family = AF_UNIX;
size_t addrlen = SUN_LEN(&local);
#ifdef UNIX_HAS_SUN_LEN
local.sun_len = addrlen + 1;
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
int err = socket_bind(&un->sock, (SA *) &local, addrlen);
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, "unixdgram{unconnected}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixdgram_trybind(un, path);
size_t len;
const char *path = luaL_checklstring(L, 2, &len);
const char *err = unixdgram_trybind(un, path, len);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
Expand Down Expand Up @@ -313,29 +310,33 @@ static int meth_getsockname(lua_State *L)
/*-------------------------------------------------------------------------*\
* Turns a master unixdgram object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unixdgram_tryconnect(p_unix un, const char *path)
static const char *unixdgram_tryconnect(p_unix un, const char *path, size_t len)
{
struct sockaddr_un remote;
size_t len = strlen(path);
int err;
if (len >= sizeof(remote.sun_path)) return "path too long";
memset(&remote, 0, sizeof(remote));
strcpy(remote.sun_path, path);
memcpy(remote.sun_path, path, len);
remote.sun_family = AF_UNIX;
timeout_markstart(&un->tm);
size_t addrlen = SUN_LEN(&remote);
#ifdef UNIX_HAS_SUN_LEN
remote.sun_len = addrlen + 1;
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
int err = socket_connect(&un->sock, (SA *) &remote, addrlen, &un->tm);
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, "unixdgram{any}", 1);
const char *path = luaL_checkstring(L, 2);
const char *err = unixdgram_tryconnect(un, path);
size_t len;
const char *path = luaL_checklstring(L, 2, &len);
const char *err = unixdgram_tryconnect(un, path, len);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
Expand Down
24 changes: 12 additions & 12 deletions src/unixstream.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -33,8 +33,8 @@ 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);
static const char *unixstream_tryconnect(p_unix un, const char *path, size_t len);
static const char *unixstream_trybind(p_unix un, const char *path, size_t len);

/* unixstream object methods */
static luaL_Reg unixstream_methods[] = {
Expand Down Expand Up @@ -181,13 +181,12 @@ static int meth_accept(lua_State *L) {
/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unixstream_trybind(p_unix un, const char *path) {
static const char *unixstream_trybind(p_unix un, const char *path, size_t len) {
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);
memcpy(local.sun_path, path, len);
local.sun_family = AF_UNIX;
#ifdef UNIX_HAS_SUN_LEN
local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
Expand All @@ -204,8 +203,9 @@ static const char *unixstream_trybind(p_unix un, const char *path) {

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);
size_t len;
const char *path = luaL_checklstring(L, 2, &len);
const char *err = unixstream_trybind(un, path, len);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
Expand Down Expand Up @@ -234,14 +234,13 @@ static int meth_getsockname(lua_State *L)
/*-------------------------------------------------------------------------*\
* Turns a master unixstream object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unixstream_tryconnect(p_unix un, const char *path)
static const char *unixstream_tryconnect(p_unix un, const char *path, size_t len)
{
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);
memcpy(remote.sun_path, path, len);
remote.sun_family = AF_UNIX;
timeout_markstart(&un->tm);
#ifdef UNIX_HAS_SUN_LEN
Expand All @@ -259,8 +258,9 @@ static const char *unixstream_tryconnect(p_unix un, const char *path)
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);
size_t len;
const char *path = luaL_checklstring(L, 2, &len);
const char *err = unixstream_tryconnect(un, path, len);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
Expand Down

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