diff options
Diffstat (limited to 'libs/nixio/src/io.c')
| -rw-r--r-- | libs/nixio/src/io.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/libs/nixio/src/io.c b/libs/nixio/src/io.c new file mode 100644 index 000000000..30327b1c0 --- /dev/null +++ b/libs/nixio/src/io.c @@ -0,0 +1,181 @@ +/* + * 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 <lua.h> +#include <lualib.h> +#include <lauxlib.h> +#include <errno.h> +#include <stdlib.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include "nixio.h" + + + +/** + * send() / sendto() helper + */ +static int nixio_sock__sendto(lua_State *L, int to) { + nixio_sock *sock = nixio__checksock(L); + struct sockaddr *addr = NULL; + socklen_t alen = 0; + + if (to) { + const char *address = luaL_checklstring(L, 2, NULL); + uint16_t port = (uint16_t)luaL_checkinteger(L, 3); + struct sockaddr_storage addrstor; + addr = (struct sockaddr*)&addrstor; + if (sock->domain == AF_INET) { + struct sockaddr_in *inetaddr = (struct sockaddr_in *)addr; + if (inet_pton(sock->domain, address, &inetaddr->sin_addr) < 0) { + return luaL_argerror(L, 3, "invalid address"); + } + inetaddr->sin_port = htons(port); + alen = sizeof(*inetaddr); + } else if (sock->domain == AF_INET6) { + struct sockaddr_in6 *inet6addr = (struct sockaddr_in6 *)addr; + if (inet_pton(sock->domain, address, &inet6addr->sin6_addr) < 0) { + return luaL_argerror(L, 3, "invalid address"); + } + inet6addr->sin6_port = htons(port); + alen = sizeof(*inet6addr); + } else { + return luaL_argerror(L, 1, "supported families: inet, inet6"); + } + } + + size_t len; + ssize_t sent; + const char *data = luaL_checklstring(L, 2, &len); + do { + sent = sendto(sock->fd, data, len, 0, addr, alen); + } while(sent == -1 && errno == EINTR); + if (len >= 0) { + lua_pushinteger(L, sent); + return 1; + } else { + return nixio__perror(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 addrobj; + int req = luaL_checkinteger(L, 2); + int readc; + + if (from && sock->domain != AF_INET && sock->domain != AF_INET6) { + return luaL_argerror(L, 1, "supported families: inet, inet6"); + } + + struct sockaddr *addr = (from) ? (struct sockaddr*)&addrobj : NULL; + socklen_t alen = (from) ? sizeof(addrobj) : 0; + + /* 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); + + if (readc < 0) { + return nixio__perror(L); + } else { + lua_pushlstring(L, buffer, readc); + + if (!from) { + return 1; + } else { + char ipaddr[INET6_ADDRSTRLEN]; + void *binaddr; + uint16_t port; + + if (addrobj.ss_family == AF_INET) { + struct sockaddr_in *inetaddr = (struct sockaddr_in*)addr; + port = inetaddr->sin_port; + binaddr = &inetaddr->sin_addr; + } else if (addrobj.ss_family == AF_INET6) { + struct sockaddr_in6 *inet6addr = (struct sockaddr_in6*)addr; + port = inet6addr->sin6_port; + binaddr = &inet6addr->sin6_addr; + } else { + return luaL_error(L, "unknown address family"); + } + + if (!inet_ntop(addrobj.ss_family, binaddr, ipaddr, sizeof(ipaddr))) { + return nixio__perror(L); + } + + lua_pushstring(L, ipaddr); + lua_pushinteger(L, ntohs(port)); + + return 3; + } + } +} + +/** + * 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}, + {NULL, NULL} +}; + +void nixio_open_io(lua_State *L) { + lua_pushvalue(L, -2); + luaL_register(L, NULL, M); + lua_pop(L, 1); +} |