Initial revision
This commit is contained in:
Diego Nehab
parent
29ce2303c8
commit
e2d21b237d
352
src/inet.c
Normal file
352
src/inet.c
Normal file
@ -0,0 +1,352 @@
|
||||
/*=========================================================================*\
|
||||
* Internet socket methods implementation
|
||||
* Global Lua fuctions:
|
||||
* toip(hostname)
|
||||
* tohostname(dotted-quad)
|
||||
* Socket table methods:
|
||||
* getpeername()
|
||||
* getsockname()
|
||||
\*=========================================================================*/
|
||||
#include <string.h>
|
||||
|
||||
#include <lua.h>
|
||||
#include <lauxlib.h>
|
||||
|
||||
#include "lsinet.h"
|
||||
#include "lssock.h"
|
||||
#include "lscompat.h"
|
||||
|
||||
/*=========================================================================*\
|
||||
* Internal function prototypes.
|
||||
\*=========================================================================*/
|
||||
static int inet_lua_toip(lua_State *L);
|
||||
static int inet_lua_tohostname(lua_State *L);
|
||||
static int inet_lua_getpeername(lua_State *L);
|
||||
static int inet_lua_getsockname(lua_State *L);
|
||||
static void inet_pushresolved(lua_State *L, struct hostent *hp);
|
||||
|
||||
#ifdef COMPAT_INETATON
|
||||
static int inet_aton(cchar *cp, struct in_addr *inp);
|
||||
#endif
|
||||
|
||||
/*=========================================================================*\
|
||||
* Exported functions
|
||||
\*=========================================================================*/
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Initializes module
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void inet_open(lua_State *L)
|
||||
{
|
||||
lua_pushcfunction(L, inet_lua_toip);
|
||||
lua_setglobal(L, "toip");
|
||||
lua_pushcfunction(L, inet_lua_tohostname);
|
||||
lua_setglobal(L, "tohostname");
|
||||
priv_newglobalmethod(L, "getsockname");
|
||||
priv_newglobalmethod(L, "getpeername");
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Hook object methods to methods table.
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void inet_inherit(lua_State *L, cchar *lsclass)
|
||||
{
|
||||
unsigned int i;
|
||||
static struct luaL_reg funcs[] = {
|
||||
{"getsockname", inet_lua_getsockname},
|
||||
{"getpeername", inet_lua_getpeername},
|
||||
};
|
||||
sock_inherit(L, lsclass);
|
||||
for (i = 0; i < sizeof(funcs)/sizeof(funcs[0]); i++) {
|
||||
lua_pushcfunction(L, funcs[i].func);
|
||||
priv_setmethod(L, lsclass, funcs[i].name);
|
||||
}
|
||||
}
|
||||
|
||||
void inet_construct(lua_State *L, p_inet inet)
|
||||
{
|
||||
sock_construct(L, (p_sock) inet);
|
||||
}
|
||||
|
||||
/*=========================================================================*\
|
||||
* Global Lua functions
|
||||
\*=========================================================================*/
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Returns the list of ip addresses associated with a host name
|
||||
* Lua Input: address
|
||||
* address: ip address or hostname to dns lookup
|
||||
* Lua Returns
|
||||
* On success: first IP address followed by a resolved table
|
||||
* On error: nil, followed by an error message
|
||||
\*-------------------------------------------------------------------------*/
|
||||
static int inet_lua_toip(lua_State *L)
|
||||
{
|
||||
cchar *address = luaL_check_string(L, 1);
|
||||
struct in_addr addr;
|
||||
struct hostent *hp;
|
||||
if (inet_aton(address, &addr))
|
||||
hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
|
||||
else hp = gethostbyname(address);
|
||||
if (!hp) {
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, compat_hoststrerror());
|
||||
return 2;
|
||||
}
|
||||
addr = *((struct in_addr *) hp->h_addr);
|
||||
lua_pushstring(L, inet_ntoa(addr));
|
||||
inet_pushresolved(L, hp);
|
||||
return 2;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Returns the list of host names associated with an ip address
|
||||
* Lua Input: address
|
||||
* address: ip address or host name to reverse dns lookup
|
||||
* Lua Returns
|
||||
* On success: canonic name followed by a resolved table
|
||||
* On error: nil, followed by an error message
|
||||
\*-------------------------------------------------------------------------*/
|
||||
static int inet_lua_tohostname(lua_State *L)
|
||||
{
|
||||
cchar *address = luaL_check_string(L, 1);
|
||||
struct in_addr addr;
|
||||
struct hostent *hp;
|
||||
if (inet_aton(address, &addr))
|
||||
hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
|
||||
else hp = gethostbyname(address);
|
||||
if (!hp) {
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, compat_hoststrerror());
|
||||
return 2;
|
||||
}
|
||||
lua_pushstring(L, hp->h_name);
|
||||
inet_pushresolved(L, hp);
|
||||
return 2;
|
||||
}
|
||||
|
||||
/*=========================================================================*\
|
||||
* Socket table methods
|
||||
\*=========================================================================*/
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Retrieves socket peer name
|
||||
* Lua Input: sock
|
||||
* sock: socket
|
||||
* Lua Returns
|
||||
* On success: ip address and port of peer
|
||||
* On error: nil
|
||||
\*-------------------------------------------------------------------------*/
|
||||
static int inet_lua_getpeername(lua_State *L)
|
||||
{
|
||||
p_sock sock = (p_sock) lua_touserdata(L, 1);
|
||||
struct sockaddr_in peer;
|
||||
size_t peer_len = sizeof(peer);
|
||||
if (getpeername(sock->fd, (SA *) &peer, &peer_len) < 0) {
|
||||
lua_pushnil(L);
|
||||
return 1;
|
||||
}
|
||||
lua_pushstring(L, inet_ntoa(peer.sin_addr));
|
||||
lua_pushnumber(L, ntohs(peer.sin_port));
|
||||
return 2;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Retrieves socket local name
|
||||
* Lua Input: sock
|
||||
* sock: socket
|
||||
* Lua Returns
|
||||
* On success: local ip address and port
|
||||
* On error: nil
|
||||
\*-------------------------------------------------------------------------*/
|
||||
static int inet_lua_getsockname(lua_State *L)
|
||||
{
|
||||
p_sock sock = (p_sock) lua_touserdata(L, 1);
|
||||
struct sockaddr_in local;
|
||||
size_t local_len = sizeof(local);
|
||||
if (getsockname(sock->fd, (SA *) &local, &local_len) < 0) {
|
||||
lua_pushnil(L);
|
||||
return 1;
|
||||
}
|
||||
lua_pushstring(L, inet_ntoa(local.sin_addr));
|
||||
lua_pushnumber(L, ntohs(local.sin_port));
|
||||
return 2;
|
||||
}
|
||||
|
||||
/*=========================================================================*\
|
||||
* Internal functions
|
||||
\*=========================================================================*/
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Passes all resolver information to Lua as a table
|
||||
* Input
|
||||
* hp: hostent structure returned by resolver
|
||||
\*-------------------------------------------------------------------------*/
|
||||
static void inet_pushresolved(lua_State *L, struct hostent *hp)
|
||||
{
|
||||
char **alias;
|
||||
struct in_addr **addr;
|
||||
int i, resolved;
|
||||
lua_newtable(L); resolved = lua_gettop(L);
|
||||
lua_pushstring(L, "name");
|
||||
lua_pushstring(L, hp->h_name);
|
||||
lua_settable(L, resolved);
|
||||
lua_pushstring(L, "ip");
|
||||
lua_pushstring(L, "alias");
|
||||
i = 1;
|
||||
alias = hp->h_aliases;
|
||||
lua_newtable(L);
|
||||
while (*alias) {
|
||||
lua_pushnumber(L, i);
|
||||
lua_pushstring(L, *alias);
|
||||
lua_settable(L, -3);
|
||||
i++; alias++;
|
||||
}
|
||||
lua_settable(L, resolved);
|
||||
i = 1;
|
||||
lua_newtable(L);
|
||||
addr = (struct in_addr **) hp->h_addr_list;
|
||||
while (*addr) {
|
||||
lua_pushnumber(L, i);
|
||||
lua_pushstring(L, inet_ntoa(**addr));
|
||||
lua_settable(L, -3);
|
||||
i++; addr++;
|
||||
}
|
||||
lua_settable(L, resolved);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Tries to create a TCP socket and connect to remote address (address, port)
|
||||
* Input
|
||||
* client: socket structure to be used
|
||||
* address: host name or ip address
|
||||
* port: port number to bind to
|
||||
* Returns
|
||||
* NULL in case of success, error message otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
cchar *inet_tryconnect(p_inet inet, cchar *address, ushort port,
|
||||
int type)
|
||||
{
|
||||
struct sockaddr_in remote;
|
||||
cchar *err = NULL;
|
||||
memset(&remote, 0, sizeof(remote));
|
||||
if (strlen(address) && inet_aton(address, &remote.sin_addr)) {
|
||||
remote.sin_family = AF_INET;
|
||||
remote.sin_port = htons(port);
|
||||
err = inet_trysocket(inet, type);
|
||||
if (err) return err;
|
||||
if (compat_connect(inet->fd, (SA *) &remote, sizeof(remote)) < 0) {
|
||||
compat_close(inet->fd);
|
||||
inet->fd = COMPAT_INVALIDFD;
|
||||
return compat_connectstrerror();
|
||||
} else return NULL;
|
||||
/* go ahead and try by hostname resolution */
|
||||
} else {
|
||||
struct hostent *hp = gethostbyname(address);
|
||||
struct in_addr **addr;
|
||||
if (!hp) return compat_hoststrerror();
|
||||
addr = (struct in_addr **) hp->h_addr_list;
|
||||
for (; *addr != NULL; addr++) {
|
||||
memcpy(&remote.sin_addr, *addr, sizeof(struct in_addr));
|
||||
remote.sin_family = AF_INET;
|
||||
remote.sin_port = htons(port);
|
||||
err = inet_trysocket(inet, type);
|
||||
if (err) return err;
|
||||
if (compat_connect(inet->fd, (SA *)&remote, sizeof(remote)) < 0) {
|
||||
compat_close(inet->fd);
|
||||
inet->fd = COMPAT_INVALIDFD;
|
||||
} else return NULL;
|
||||
memset(&remote, 0, sizeof(remote));
|
||||
}
|
||||
return compat_connectstrerror();
|
||||
}
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Tries to create a TCP socket and bind it to (address, port)
|
||||
* Input
|
||||
* address: host name or ip address
|
||||
* port: port number to bind to
|
||||
* backlog: backlog to set
|
||||
* Returns
|
||||
* NULL in case of success, error message otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
cchar *inet_trybind(p_inet inet, cchar *address, ushort port,
|
||||
int type)
|
||||
{
|
||||
struct sockaddr_in local;
|
||||
cchar *err = NULL;
|
||||
memset(&local, 0, sizeof(local));
|
||||
/* address is either wildcard or a valid ip address */
|
||||
local.sin_addr.s_addr = htonl(INADDR_ANY);
|
||||
if (!strcmp(address, "*") ||
|
||||
(strlen(address) && inet_aton(address, &local.sin_addr))) {
|
||||
local.sin_port = htons(port);
|
||||
local.sin_family = AF_INET;
|
||||
err = inet_trysocket(inet, type);
|
||||
if (err) return err;
|
||||
compat_setreuseaddr(inet->fd);
|
||||
if (compat_bind(inet->fd, (SA *) &local, sizeof(local)) < 0) {
|
||||
compat_close(inet->fd);
|
||||
inet->fd = COMPAT_INVALIDFD;
|
||||
return compat_bindstrerror();
|
||||
} else return NULL;
|
||||
/* otherwise, proceed with domain name resolution */
|
||||
} else {
|
||||
struct hostent *hp = gethostbyname(address);
|
||||
struct in_addr **addr;
|
||||
if (!hp) return compat_hoststrerror();
|
||||
addr = (struct in_addr **) hp->h_addr_list;
|
||||
for (; *addr != NULL; addr++) {
|
||||
memcpy(&local.sin_addr, *addr, sizeof(struct in_addr));
|
||||
local.sin_port = htons(port);
|
||||
local.sin_family = AF_INET;
|
||||
err = inet_trysocket(inet, type);
|
||||
if (err) return err;
|
||||
compat_setreuseaddr(inet->fd);
|
||||
if (compat_bind(inet->fd, (SA *) &local, sizeof(local)) < 0) {
|
||||
compat_close(inet->fd);
|
||||
inet->fd = COMPAT_INVALIDFD;
|
||||
} else return NULL;
|
||||
memset(&local, 0, sizeof(local));
|
||||
}
|
||||
return compat_bindstrerror();
|
||||
}
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Tries to create a new inet socket
|
||||
* Input
|
||||
* udp: udp structure
|
||||
* Returns
|
||||
* NULL if successfull, error message on error
|
||||
\*-------------------------------------------------------------------------*/
|
||||
cchar *inet_trysocket(p_inet inet, int type)
|
||||
{
|
||||
if (inet->fd != COMPAT_INVALIDFD) compat_close(inet->fd);
|
||||
inet->fd = compat_socket(AF_INET, type, 0);
|
||||
if (inet->fd == COMPAT_INVALIDFD) return compat_socketstrerror();
|
||||
else return NULL;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Some systems do not provide this so that we provide our own. It's not
|
||||
* marvelously fast, but it works just fine.
|
||||
\*-------------------------------------------------------------------------*/
|
||||
#ifdef COMPAT_INETATON
|
||||
static int inet_aton(const char *cp, struct in_addr *inp)
|
||||
{
|
||||
unsigned int a = 0, b = 0, c = 0, d = 0;
|
||||
int n = 0, r;
|
||||
unsigned long int addr = 0;
|
||||
r = sscanf(cp, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n);
|
||||
if (r == 0 || n == 0) return 0;
|
||||
cp += n;
|
||||
if (*cp) return 0;
|
||||
if (a > 255 || b > 255 || c > 255 || d > 255) return 0;
|
||||
if (inp) {
|
||||
addr += a; addr <<= 8;
|
||||
addr += b; addr <<= 8;
|
||||
addr += c; addr <<= 8;
|
||||
addr += d;
|
||||
inp->s_addr = htonl(addr);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
#endif
|
||||
Loading…
x
Reference in New Issue
Block a user