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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nixio.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
/**
* send() / sendto() helper
*/
static int nixio_sock__sendto(lua_State *L, int to) {
nixio_sock *sock = nixio__checksock(L);
struct sockaddr_storage addr_in;
#ifndef __WINNT__
struct sockaddr_un addr_un;
#endif
struct sockaddr *addr = NULL;
socklen_t alen = 0;
int argoff = 2;
if (to) {
argoff += 2;
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
const char *address = luaL_checkstring(L, 3);
addr = (struct sockaddr*)&addr_in;
alen = sizeof(addr_in);
nixio_addr naddr;
memset(&naddr, 0, sizeof(naddr));
strncpy(naddr.host, address, sizeof(naddr.host) - 1);
naddr.port = (uint16_t)luaL_checkinteger(L, 4);
naddr.family = sock->domain;
if (nixio__addr_write(&naddr, addr)) {
return nixio__perror_s(L);
}
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX) {
size_t pathlen;
const char *path = luaL_checklstring(L, 3, &pathlen);
addr_un.sun_family = AF_UNIX;
luaL_argcheck(L, pathlen <= sizeof(addr_un.sun_path), 3, "out of range");
memcpy(addr_un.sun_path, path, pathlen);
addr = (struct sockaddr*)&addr_un;
alen = sizeof(sa_family_t) + pathlen;
}
#endif
}
size_t len;
ssize_t sent;
const char *data = luaL_checklstring(L, 2, &len);
if (lua_gettop(L) > argoff) {
int offset = luaL_optint(L, argoff + 1, 0);
if (offset) {
if (offset < len) {
data += offset;
len -= offset;
} else {
len = 0;
}
}
unsigned int wlen = luaL_optint(L, argoff + 2, len);
if (wlen < len) {
len = wlen;
}
}
do {
sent = sendto(sock->fd, data, len, 0, addr, alen);
} while(sent == -1 && errno == EINTR);
if (sent >= 0) {
lua_pushinteger(L, sent);
return 1;
} else {
return nixio__perror_s(L);
}
}
/**
* send(data)
*/
static int nixio_sock_send(lua_State *L) {
return nixio_sock__sendto(L, 0);
}
/**
* sendto(data, address, port)
*/
static int nixio_sock_sendto(lua_State *L) {
return nixio_sock__sendto(L, 1);
}
/**
* recv() / recvfrom() helper
*/
static int nixio_sock__recvfrom(lua_State *L, int from) {
nixio_sock *sock = nixio__checksock(L);
char buffer[NIXIO_BUFFERSIZE];
struct sockaddr_storage addr_in;
#ifndef __WINNT__
struct sockaddr_un addr_un;
#endif
struct sockaddr *addr = NULL;
socklen_t alen = 0;
uint req = luaL_checkinteger(L, 2);
int readc;
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
addr = (from) ? (struct sockaddr*)&addr_in : NULL;
alen = (from) ? sizeof(addr_in) : 0;
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX) {
addr = (from) ? (struct sockaddr*)&addr_un : NULL;
alen = (from) ? sizeof(addr_un) : 0;
}
#endif
/* We limit the readsize to NIXIO_BUFFERSIZE */
req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
do {
readc = recvfrom(sock->fd, buffer, req, 0, addr, &alen);
} while (readc == -1 && errno == EINTR);
#ifdef __WINNT__
if (readc < 0) {
int e = WSAGetLastError();
if (e == WSAECONNRESET || e == WSAECONNABORTED || e == WSAESHUTDOWN) {
readc = 0;
}
}
#endif
if (readc < 0) {
return nixio__perror_s(L);
} else {
lua_pushlstring(L, buffer, readc);
if (!from) {
return 1;
}
/* push address. */
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
nixio_addr naddr;
if (!nixio__addr_parse(&naddr, (struct sockaddr *)&addr_in)) {
lua_pushstring(L, naddr.host);
lua_pushinteger(L, naddr.port);
return 3;
} else {
return 1;
}
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX && alen > sizeof(sa_family_t)) {
/* if first char is non-null then the path is not in the
abstract namespace and alen includes the trailing null */
if (addr_un.sun_path[0])
--alen;
lua_pushlstring(L, addr_un.sun_path, alen - sizeof(sa_family_t));
return 2;
}
#endif
}
return 1;
}
/**
* recv(count)
*/
static int nixio_sock_recv(lua_State *L) {
return nixio_sock__recvfrom(L, 0);
}
/**
* recvfrom(count)
*/
static int nixio_sock_recvfrom(lua_State *L) {
return nixio_sock__recvfrom(L, 1);
}
/* module table */
static const luaL_Reg M[] = {
{"send", nixio_sock_send},
{"sendto", nixio_sock_sendto},
{"recv", nixio_sock_recv},
{"recvfrom",nixio_sock_recvfrom},
{"write", nixio_sock_send},
{"read", nixio_sock_recv},
{NULL, NULL}
};
void nixio_open_io(lua_State *L) {
lua_pushvalue(L, -2);
luaL_register(L, NULL, M);
lua_pop(L, 1);
}
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