1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/*
* This file defines the lua interface into
* FRRouting.
*
* Copyright (C) 2016-2019 Cumulus Networks, Inc.
* Donald Sharp, Quentin Young
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#if defined(HAVE_LUA)
#include "prefix.h"
#include "frrlua.h"
#include "log.h"
/*
* Lua -> FRR function bindings.
*
* This section defines functions exportable into Lua environments.
*/
static int lua_zlog_debug(lua_State *L)
{
int debug_lua = 1;
const char *string = lua_tostring(L, 1);
if (debug_lua)
zlog_debug("%s", string);
return 0;
}
/*
* FRR convenience functions.
*
* This section has convenience functions used to make interacting with the Lua
* stack easier.
*/
const char *frrlua_table_get_string(lua_State *L, const char *key)
{
const char *str;
lua_pushstring(L, key);
lua_gettable(L, -2);
str = (const char *)lua_tostring(L, -1);
lua_pop(L, 1);
return str;
}
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;
}
/*
* Encoders.
*
* This section has functions that convert internal FRR datatypes into Lua
* datatypes.
*/
void frrlua_newtable_prefix(lua_State *L, const struct prefix *prefix)
{
char buffer[100];
zlog_debug("frrlua: pushing prefix table");
lua_newtable(L);
lua_pushstring(L, prefix2str(prefix, buffer, 100));
lua_setfield(L, -2, "route");
lua_pushinteger(L, prefix->family);
lua_setfield(L, -2, "family");
lua_setglobal(L, "prefix");
}
void frrlua_newtable_interface(lua_State *L, const struct interface *ifp)
{
zlog_debug("frrlua: pushing interface table");
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");
}
/*
* Experimental.
*
* This section has experimental Lua functionality that doesn't belong
* elsewhere.
*/
enum frrlua_rm_status frrlua_run_rm_rule(lua_State *L, const char *rule)
{
int status;
lua_getglobal(L, rule);
status = lua_pcall(L, 0, 1, 0);
if (status) {
zlog_debug("Executing Failure with function: %s: %d",
rule, status);
return LUA_RM_FAILURE;
}
status = lua_tonumber(L, -1);
return status;
}
/* Initialization */
static void *frrlua_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
{
(void)ud;
(void)osize; /* not used */
if (nsize == 0) {
free(ptr);
return NULL;
} else
return realloc(ptr, nsize);
}
lua_State *frrlua_initialize(const char *file)
{
int status;
lua_State *L = lua_newstate(frrlua_alloc, NULL);
zlog_debug("Newstate: %p", L);
luaL_openlibs(L);
zlog_debug("Opened lib");
if (file) {
status = luaL_loadfile(L, file);
if (status) {
zlog_debug("Failure to open %s %d", file, status);
lua_close(L);
return NULL;
}
lua_pcall(L, 0, LUA_MULTRET, 0);
}
zlog_debug("Setting global function");
lua_pushcfunction(L, lua_zlog_debug);
lua_setglobal(L, "zlog_debug");
return L;
}
#endif
|
