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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file defines the lua interface into
* FRRouting.
*
* Copyright (C) 2016-2019 Cumulus Networks, Inc.
* Donald Sharp, Quentin Young
*/
#include <zebra.h>
#ifdef HAVE_SCRIPTING
#include "prefix.h"
#include "frrlua.h"
#include "log.h"
#include "buffer.h"
DEFINE_MTYPE(LIB, SCRIPT_RES, "Scripting results");
/* Lua stuff */
/*
* FRR convenience functions.
*
* This section has convenience functions used to make interacting with the Lua
* stack easier.
*/
int frrlua_table_get_integer(lua_State *L, const char *key)
{
int result;
lua_pushstring(L, key);
lua_gettable(L, -2);
result = lua_tointeger(L, -1);
lua_pop(L, 1);
return result;
}
/*
* This section has functions that convert internal FRR datatypes into Lua
* datatypes: one encoder function and two decoder functions for each type.
*
*/
void lua_pushprefix(lua_State *L, const struct prefix *prefix)
{
char buffer[PREFIX_STRLEN];
lua_newtable(L);
lua_pushstring(L, prefix2str(prefix, buffer, PREFIX_STRLEN));
lua_setfield(L, -2, "network");
lua_pushinteger(L, prefix->prefixlen);
lua_setfield(L, -2, "length");
lua_pushinteger(L, prefix->family);
lua_setfield(L, -2, "family");
}
void lua_decode_prefix(lua_State *L, int idx, struct prefix *prefix)
{
lua_getfield(L, idx, "network");
(void)str2prefix(lua_tostring(L, -1), prefix);
lua_pop(L, 1);
/* pop the table */
lua_pop(L, 1);
}
void *lua_toprefix(lua_State *L, int idx)
{
struct prefix *p = XCALLOC(MTYPE_SCRIPT_RES, sizeof(struct prefix));
lua_decode_prefix(L, idx, p);
return p;
}
void lua_pushinterface(lua_State *L, const struct interface *ifp)
{
lua_newtable(L);
lua_pushstring(L, ifp->name);
lua_setfield(L, -2, "name");
lua_pushinteger(L, ifp->ifindex);
lua_setfield(L, -2, "ifindex");
lua_pushinteger(L, ifp->status);
lua_setfield(L, -2, "status");
lua_pushinteger(L, ifp->flags);
lua_setfield(L, -2, "flags");
lua_pushinteger(L, ifp->metric);
lua_setfield(L, -2, "metric");
lua_pushinteger(L, ifp->speed);
lua_setfield(L, -2, "speed");
lua_pushinteger(L, ifp->mtu);
lua_setfield(L, -2, "mtu");
lua_pushinteger(L, ifp->mtu6);
lua_setfield(L, -2, "mtu6");
lua_pushinteger(L, ifp->bandwidth);
lua_setfield(L, -2, "bandwidth");
lua_pushinteger(L, ifp->link_ifindex);
lua_setfield(L, -2, "link_ifindex");
lua_pushinteger(L, ifp->ll_type);
lua_setfield(L, -2, "linklayer_type");
}
void lua_decode_interface(lua_State *L, int idx, struct interface *ifp)
{
lua_getfield(L, idx, "name");
strlcpy(ifp->name, lua_tostring(L, -1), sizeof(ifp->name));
lua_pop(L, 1);
lua_getfield(L, idx, "ifindex");
ifp->ifindex = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "status");
ifp->status = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "flags");
ifp->flags = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "metric");
ifp->metric = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "speed");
ifp->speed = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "mtu");
ifp->mtu = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "mtu6");
ifp->mtu6 = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "bandwidth");
ifp->bandwidth = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "link_ifindex");
ifp->link_ifindex = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_getfield(L, idx, "linklayer_type");
ifp->ll_type = lua_tointeger(L, -1);
lua_pop(L, 1);
/* pop the table */
lua_pop(L, 1);
}
void *lua_tointerface(lua_State *L, int idx)
{
struct interface *ifp =
XCALLOC(MTYPE_SCRIPT_RES, sizeof(struct interface));
lua_decode_interface(L, idx, ifp);
return ifp;
}
void lua_pushinaddr(lua_State *L, const struct in_addr *addr)
{
char buf[INET_ADDRSTRLEN];
inet_ntop(AF_INET, addr, buf, sizeof(buf));
lua_newtable(L);
lua_pushinteger(L, addr->s_addr);
lua_setfield(L, -2, "value");
lua_pushstring(L, buf);
lua_setfield(L, -2, "string");
}
void lua_decode_inaddr(lua_State *L, int idx, struct in_addr *inaddr)
{
lua_getfield(L, idx, "value");
inaddr->s_addr = lua_tointeger(L, -1);
lua_pop(L, 1);
/* pop the table */
lua_pop(L, 1);
}
void *lua_toinaddr(lua_State *L, int idx)
{
struct in_addr *inaddr =
XCALLOC(MTYPE_SCRIPT_RES, sizeof(struct in_addr));
lua_decode_inaddr(L, idx, inaddr);
return inaddr;
}
void lua_pushin6addr(lua_State *L, const struct in6_addr *addr)
{
char buf[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, addr, buf, sizeof(buf));
lua_newtable(L);
lua_pushlstring(L, (const char *)addr->s6_addr, 16);
lua_setfield(L, -2, "value");
lua_pushstring(L, buf);
lua_setfield(L, -2, "string");
}
void lua_decode_in6addr(lua_State *L, int idx, struct in6_addr *in6addr)
{
lua_getfield(L, idx, "string");
inet_pton(AF_INET6, lua_tostring(L, -1), in6addr);
lua_pop(L, 1);
/* pop the table */
lua_pop(L, 1);
}
void *lua_toin6addr(lua_State *L, int idx)
{
struct in6_addr *in6addr =
XCALLOC(MTYPE_SCRIPT_RES, sizeof(struct in6_addr));
lua_decode_in6addr(L, idx, in6addr);
return in6addr;
}
void lua_pushipaddr(lua_State *L, const struct ipaddr *addr)
{
if (IS_IPADDR_V4(addr))
lua_pushinaddr(L, &addr->ipaddr_v4);
else
lua_pushin6addr(L, &addr->ipaddr_v6);
}
void lua_pushethaddr(lua_State *L, const struct ethaddr *addr)
{
lua_newtable(L);
lua_pushinteger(L, *(addr->octet));
lua_setfield(L, -2, "octet");
}
void lua_pushsockunion(lua_State *L, const union sockunion *su)
{
char buf[SU_ADDRSTRLEN];
sockunion2str(su, buf, sizeof(buf));
lua_newtable(L);
lua_pushlstring(L, (const char *)sockunion_get_addr(su),
sockunion_get_addrlen(su));
lua_setfield(L, -2, "value");
lua_pushstring(L, buf);
lua_setfield(L, -2, "string");
}
void lua_decode_sockunion(lua_State *L, int idx, union sockunion *su)
{
lua_getfield(L, idx, "string");
if (str2sockunion(lua_tostring(L, -1), su) < 0)
zlog_err("Lua hook call: Failed to decode sockunion");
lua_pop(L, 1);
/* pop the table */
lua_pop(L, 1);
}
void *lua_tosockunion(lua_State *L, int idx)
{
union sockunion *su =
XCALLOC(MTYPE_SCRIPT_RES, sizeof(union sockunion));
lua_decode_sockunion(L, idx, su);
return su;
}
void lua_pushtimet(lua_State *L, const time_t *time)
{
lua_pushinteger(L, *time);
}
void lua_decode_timet(lua_State *L, int idx, time_t *t)
{
*t = lua_tointeger(L, idx);
lua_pop(L, 1);
}
void *lua_totimet(lua_State *L, int idx)
{
time_t *t = XCALLOC(MTYPE_SCRIPT_RES, sizeof(time_t));
lua_decode_timet(L, idx, t);
return t;
}
void lua_pushintegerp(lua_State *L, const long long *num)
{
lua_pushinteger(L, *num);
}
void lua_decode_integerp(lua_State *L, int idx, long long *num)
{
int isnum;
*num = lua_tonumberx(L, idx, &isnum);
lua_pop(L, 1);
assert(isnum);
}
void *lua_tointegerp(lua_State *L, int idx)
{
long long *num = XCALLOC(MTYPE_SCRIPT_RES, sizeof(long long));
lua_decode_integerp(L, idx, num);
return num;
}
void lua_pushnexthop(lua_State *L, const struct nexthop *nexthop)
{
lua_newtable(L);
lua_pushinteger(L, nexthop->vrf_id);
lua_setfield(L, -2, "vrf_id");
lua_pushinteger(L, nexthop->ifindex);
lua_setfield(L, -2, "ifindex");
lua_pushinteger(L, nexthop->type);
lua_setfield(L, -2, "type");
lua_pushinteger(L, nexthop->flags);
lua_setfield(L, -2, "flags");
if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) {
lua_pushinteger(L, nexthop->bh_type);
lua_setfield(L, -2, "bh_type");
} else if (nexthop->type == NEXTHOP_TYPE_IPV4) {
lua_pushinaddr(L, &nexthop->gate.ipv4);
lua_setfield(L, -2, "gate");
} else if (nexthop->type == NEXTHOP_TYPE_IPV6) {
lua_pushin6addr(L, &nexthop->gate.ipv6);
lua_setfield(L, -2, "gate");
}
lua_pushinteger(L, nexthop->nh_label_type);
lua_setfield(L, -2, "nh_label_type");
lua_pushinteger(L, nexthop->weight);
lua_setfield(L, -2, "weight");
lua_pushinteger(L, nexthop->backup_num);
lua_setfield(L, -2, "backup_num");
lua_pushinteger(L, *(nexthop->backup_idx));
lua_setfield(L, -2, "backup_idx");
if (nexthop->nh_encap_type == NET_VXLAN) {
lua_pushinteger(L, nexthop->nh_encap.vni);
lua_setfield(L, -2, "vni");
}
lua_pushinteger(L, nexthop->nh_encap_type);
lua_setfield(L, -2, "nh_encap_type");
lua_pushinteger(L, nexthop->srte_color);
lua_setfield(L, -2, "srte_color");
}
void lua_pushnexthop_group(lua_State *L, const struct nexthop_group *ng)
{
lua_newtable(L);
struct nexthop *nexthop;
int i = 0;
for (ALL_NEXTHOPS_PTR(ng, nexthop)) {
lua_pushnexthop(L, nexthop);
lua_seti(L, -2, i);
i++;
}
}
void lua_decode_stringp(lua_State *L, int idx, char *str)
{
strlcpy(str, lua_tostring(L, idx), strlen(str) + 1);
lua_pop(L, 1);
}
void *lua_tostringp(lua_State *L, int idx)
{
char *string = XSTRDUP(MTYPE_SCRIPT_RES, lua_tostring(L, idx));
return string;
}
/*
* Decoder for const values, since we cannot modify them.
*/
void lua_decode_noop(lua_State *L, int idx, const void *ptr)
{
}
/*
* Noop decoder for int.
*/
void lua_decode_integer_noop(lua_State *L, int idx, int i)
{
}
/*
* Logging.
*
* Lua-compatible wrappers for FRR logging functions.
*/
static const char *frrlua_log_thunk(lua_State *L)
{
int nargs;
nargs = lua_gettop(L);
assert(nargs == 1);
return lua_tostring(L, 1);
}
static int frrlua_log_debug(lua_State *L)
{
zlog_debug("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_info(lua_State *L)
{
zlog_info("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_notice(lua_State *L)
{
zlog_notice("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_warn(lua_State *L)
{
zlog_warn("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_error(lua_State *L)
{
zlog_err("%s", frrlua_log_thunk(L));
return 0;
}
static const luaL_Reg log_funcs[] = {
{"debug", frrlua_log_debug},
{"info", frrlua_log_info},
{"notice", frrlua_log_notice},
{"warn", frrlua_log_warn},
{"error", frrlua_log_error},
{},
};
void frrlua_export_logging(lua_State *L)
{
lua_newtable(L);
luaL_setfuncs(L, log_funcs, 0);
lua_setglobal(L, "log");
}
/*
* Debugging.
*/
char *frrlua_stackdump(lua_State *L)
{
int top = lua_gettop(L);
char tmpbuf[64];
struct buffer *buf = buffer_new(4098);
for (int i = 1; i <= top; i++) {
int t = lua_type(L, i);
switch (t) {
case LUA_TSTRING: /* strings */
snprintf(tmpbuf, sizeof(tmpbuf), "\"%s\"\n",
lua_tostring(L, i));
buffer_putstr(buf, tmpbuf);
break;
case LUA_TBOOLEAN: /* booleans */
snprintf(tmpbuf, sizeof(tmpbuf), "%s\n",
lua_toboolean(L, i) ? "true" : "false");
buffer_putstr(buf, tmpbuf);
break;
case LUA_TNUMBER: /* numbers */
snprintf(tmpbuf, sizeof(tmpbuf), "%g\n",
lua_tonumber(L, i));
buffer_putstr(buf, tmpbuf);
break;
default: /* other values */
snprintf(tmpbuf, sizeof(tmpbuf), "%s\n",
lua_typename(L, t));
buffer_putstr(buf, tmpbuf);
break;
}
}
char *result = XSTRDUP(MTYPE_TMP, buffer_getstr(buf));
buffer_free(buf);
return result;
}
#endif /* HAVE_SCRIPTING */
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