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Add a getnameinfo() wrapper

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This wrapper takes a domain name or an IP as first argument
and a service name or port as second argument.
Either argument may be nil.

It returns a list of names (always only one in the IP case) and a
service name.
This commit is contained in:
Florian Zeitz 2012-05-05 02:13:56 +02:00
parent 04be61f88d
commit 0c3e067af1
1 changed files with 48 additions and 0 deletions
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48
src/inet.c
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@ -16,6 +16,7 @@
static int inet_global_toip(lua_State *L);
static int inet_global_getaddrinfo(lua_State *L);
static int inet_global_tohostname(lua_State *L);
static int inet_global_getnameinfo(lua_State *L);
static void inet_pushresolved(lua_State *L, struct hostent *hp);
static int inet_global_gethostname(lua_State *L);
@ -24,6 +25,7 @@ static luaL_Reg func[] = {
{ "toip", inet_global_toip},
{ "getaddrinfo", inet_global_getaddrinfo},
{ "tohostname", inet_global_tohostname},
{ "getnameinfo", inet_global_getnameinfo},
{ "gethostname", inet_global_gethostname},
{ NULL, NULL}
};
@ -76,6 +78,52 @@ static int inet_global_tohostname(lua_State *L) {
return 2;
}
static int inet_global_getnameinfo(lua_State *L) {
int i, ret;
char host[1024];
char serv[32];
struct addrinfo hints;
struct addrinfo *resolved, *iter;
const char *node = luaL_optstring(L, 1, NULL);
const char *service = luaL_optstring(L, 2, NULL);
if (!(node || service))
luaL_error(L, "You have to specify a hostname, a service, or both");
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = PF_UNSPEC;
/* getaddrinfo must get a node and a service argument */
ret = getaddrinfo(node ? node : "127.0.0.1", service ? service : "7",
&hints, &resolved);
if (ret != 0) {
lua_pushnil(L);
lua_pushstring(L, socket_gaistrerror(ret));
return 2;
}
lua_newtable(L);
for (i = 1, iter = resolved; iter; i++, iter = iter->ai_next) {
getnameinfo(iter->ai_addr, iter->ai_addrlen, host,
node ? sizeof(host) : 0, serv, service ? sizeof(serv) : 0, 0);
if (node) {
lua_pushnumber(L, i);
lua_pushstring(L, host);
lua_settable(L, -3);
}
}
freeaddrinfo(resolved);
if (service) {
lua_pushstring(L, serv);
return 2;
} else {
return 1;
}
}
/*-------------------------------------------------------------------------*\
* Returns all information provided by the resolver given a host name
* or ip address