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Add tcp syn packet fingerprinting to redbean

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This change also fixes bugs in enoprotoopt reporting with setsockopt and
getsockopt error returns.
This commit is contained in:
Justine Tunney 2022-07-17 02:40:39 -07:00
parent 866b21a151
commit 4d25f8c3c9
75 changed files with 1551 additions and 115 deletions
Download patch file Download diff file Expand all files Collapse all files

29
third_party/lua/lunix.c vendored
View file

@ -1085,6 +1085,7 @@ static bool IsSockoptBool(int l, int x) {
return x == TCP_NODELAY || //
x == TCP_CORK || //
x == TCP_QUICKACK || //
x == TCP_SAVE_SYN || //
x == TCP_FASTOPEN_CONNECT || //
x == TCP_DEFER_ACCEPT; //
} else if (l = SOL_IP) {
@ -1136,6 +1137,11 @@ static int LuaUnixSetsockopt(lua_State *L) {
fd = luaL_checkinteger(L, 1);
level = luaL_checkinteger(L, 2);
optname = luaL_checkinteger(L, 3);
if (level == -1 || optname == 0) {
NoProtocolOption:
enoprotoopt();
return SysretErrno(L, "setsockopt", olderr);
}
if (IsSockoptBool(level, optname)) {
// unix.setsockopt(fd:int, level:int, optname:int, value:bool)
// ├─→ true
@ -1167,14 +1173,14 @@ static int LuaUnixSetsockopt(lua_State *L) {
optval = &l;
optsize = sizeof(l);
} else {
einval();
return SysretErrno(L, "setsockopt", olderr);
goto NoProtocolOption;
}
return SysretBool(L, "setsockopt", olderr,
setsockopt(fd, level, optname, optval, optsize));
}
static int LuaUnixGetsockopt(lua_State *L) {
char *p;
uint32_t size;
struct linger l;
struct timeval tv;
@ -1182,6 +1188,11 @@ static int LuaUnixGetsockopt(lua_State *L) {
fd = luaL_checkinteger(L, 1);
level = luaL_checkinteger(L, 2);
optname = luaL_checkinteger(L, 3);
if (level == -1 || optname == 0) {
NoProtocolOption:
enoprotoopt();
return SysretErrno(L, "setsockopt", olderr);
}
if (IsSockoptBool(level, optname) || IsSockoptInt(level, optname)) {
// unix.getsockopt(fd:int, level:int, optname:int)
// ├─→ value:int
@ -1214,8 +1225,20 @@ static int LuaUnixGetsockopt(lua_State *L) {
lua_pushboolean(L, !!l.l_onoff);
return 1;
}
} else if (level == SOL_TCP && optname == TCP_SAVED_SYN) {
// unix.getsockopt(fd:int, unix.SOL_TCP, unix.SO_SAVED_SYN)
// ├─→ syn_packet_bytes:str
// └─→ nil, unix.Errno
if ((p = malloc((size = 1500)))) {
if (getsockopt(fd, level, optname, p, &size) != -1) {
lua_pushlstring(L, p, size);
free(p);
return 1;
}
free(p);
}
} else {
einval();
goto NoProtocolOption;
}
return SysretErrno(L, "getsockopt", olderr);
}