diff options
Diffstat (limited to 'libs/luci-lib-nixio/src/io.c')
| -rw-r--r-- | libs/luci-lib-nixio/src/io.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/libs/luci-lib-nixio/src/io.c b/libs/luci-lib-nixio/src/io.c new file mode 100644 index 000000000..12d5c7df4 --- /dev/null +++ b/libs/luci-lib-nixio/src/io.c @@ -0,0 +1,225 @@ +/* + * 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); +} |