libs/nixio/src/sockopt.c

   1 /*
   2  * nixio - Linux I/O library for lua
   3  *
   4  *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
   5  *
   6  *  Licensed under the Apache License, Version 2.0 (the "License");
   7  *  you may not use this file except in compliance with the License.
   8  *  You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *  Unless required by applicable law or agreed to in writing, software
  13  *  distributed under the License is distributed on an "AS IS" BASIS,
  14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *  See the License for the specific language governing permissions and
  16  *  limitations under the License.
  17  */
  18
  19 #include "nixio.h"
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <netinet/tcp.h>
  23 #include <sys/time.h>
  24 #include <string.h>
  25 #include <fcntl.h>
  26 #include "nixio.h"
  27
  28 /**
  29  * setblocking()
  30  */
  31 static int nixio_sock_setblocking(lua_State *L) {
  32         int fd = nixio__checkfd(L, 1);
  33         luaL_checkany(L, 2);
  34         int set = lua_toboolean(L, 2);
  35         int flags = fcntl(fd, F_GETFL);
  36
  37         if (flags == -1) {
  38                 return nixio__perror(L);
  39         }
  40
  41         if (!set) {
  42                 flags |= O_NONBLOCK;
  43         } else {
  44                 flags &= ~O_NONBLOCK;
  45         }
  46
  47         return nixio__pstatus(L, !fcntl(fd, F_SETFL, flags));
  48 }
  49
  50 static int nixio__gso_int(lua_State *L, int fd, int level, int opt, int set) {
  51         int value;
  52         socklen_t optlen = sizeof(value);
  53         if (!set) {
  54                 if (!getsockopt(fd, level, opt, &value, &optlen)) {
  55                         lua_pushinteger(L, value);
  56                         return 1;
  57                 }
  58         } else {
  59                 value = luaL_checkinteger(L, set);
  60                 if (!setsockopt(fd, level, opt, &value, optlen)) {
  61                         lua_pushboolean(L, 1);
  62                         return 1;
  63                 }
  64         }
  65         return nixio__perror(L);
  66 }
  67
  68 static int nixio__gso_ling(lua_State *L, int fd, int level, int opt, int set) {
  69         struct linger value;
  70         socklen_t optlen = sizeof(value);
  71         if (!set) {
  72                 if (!getsockopt(fd, level, opt, &value, &optlen)) {
  73                         lua_pushinteger(L, value.l_onoff ? value.l_linger : 0);
  74                         return 1;
  75                 }
  76         } else {
  77                 value.l_linger = luaL_checkinteger(L, set);
  78                 value.l_onoff = value.l_linger ? 1 : 0;
  79                 if (!setsockopt(fd, level, opt, &value, optlen)) {
  80                         lua_pushboolean(L, 1);
  81                         return 1;
  82                 }
  83         }
  84         return nixio__perror(L);
  85 }
  86
  87 static int nixio__gso_timev(lua_State *L, int fd, int level, int opt, int set) {
  88         struct timeval value;
  89         socklen_t optlen = sizeof(value);
  90         if (!set) {
  91                 if (!getsockopt(fd, level, opt, &value, &optlen)) {
  92                         lua_pushinteger(L, value.tv_sec);
  93                         lua_pushinteger(L, value.tv_usec);
  94                         return 2;
  95                 }
  96         } else {
  97                 value.tv_sec  = luaL_checkinteger(L, set);
  98                 value.tv_usec = luaL_optinteger(L, set + 1, 0);
  99                 if (!setsockopt(fd, level, opt, &value, optlen)) {
 100                         lua_pushboolean(L, 1);
 101                         return 1;
 102                 }
 103         }
 104         return nixio__perror(L);
 105 }
 106
 107 /**
 108  * get/setsockopt() helper
 109  */
 110 static int nixio__getsetsockopt(lua_State *L, int set) {
 111         nixio_sock *sock = nixio__checksock(L);
 112         const char *level = luaL_optlstring(L, 2, "", NULL);
 113         const char *option = luaL_optlstring(L, 3, "", NULL);
 114         set = (set) ? 4 : 0;
 115
 116         if (!strcmp(level, "socket")) {
 117                 if (!strcmp(option, "keepalive")) {
 118                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_KEEPALIVE, set);
 119                 } else if (!strcmp(option, "reuseaddr")) {
 120                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_REUSEADDR, set);
 121                 } else if (!strcmp(option, "rcvbuf")) {
 122                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_RCVBUF, set);
 123                 } else if (!strcmp(option, "sndbuf")) {
 124                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_SNDBUF, set);
 125                 } else if (!strcmp(option, "priority")) {
 126                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_PRIORITY, set);
 127                 } else if (!strcmp(option, "broadcast")) {
 128                         return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_BROADCAST, set);
 129                 } else if (!strcmp(option, "linger")) {
 130                         return nixio__gso_ling(L, sock->fd, SOL_SOCKET, SO_LINGER, set);
 131                 } else if (!strcmp(option, "sndtimeo")) {
 132                         return nixio__gso_timev(L, sock->fd, SOL_SOCKET, SO_SNDTIMEO, set);
 133                 } else if (!strcmp(option, "rcvtimeo")) {
 134                         return nixio__gso_timev(L, sock->fd, SOL_SOCKET, SO_RCVTIMEO, set);
 135                 } else {
 136                         return luaL_argerror(L, 3, "supported values: keepalive, reuseaddr,"
 137                          " sndbuf, rcvbuf, priority, broadcast, linger, sndtimeo, rcvtimeo"
 138                         );
 139                 }
 140         } else if (!strcmp(level, "tcp")) {
 141                 if (sock->type != SOCK_STREAM) {
 142                         return luaL_error(L, "not a TCP socket");
 143                 }
 144                 if (!strcmp(option, "cork")) {
 145                         return nixio__gso_int(L, sock->fd, SOL_TCP, TCP_CORK, set);
 146                 } else if (!strcmp(option, "nodelay")) {
 147                         return nixio__gso_int(L, sock->fd, SOL_TCP, TCP_NODELAY, set);
 148                 } else {
 149                         return luaL_argerror(L, 3, "supported values: cork, nodelay");
 150                 }
 151         } else {
 152                 return luaL_argerror(L, 2, "supported values: socket, tcp");
 153         }
 154 }
 155
 156 /**
 157  * getsockopt()
 158  */
 159 static int nixio_sock_getsockopt(lua_State *L) {
 160         return nixio__getsetsockopt(L, 0);
 161 }
 162
 163 /**
 164  * setsockopt()
 165  */
 166 static int nixio_sock_setsockopt(lua_State *L) {
 167         return nixio__getsetsockopt(L, 1);
 168 }
 169
 170 /* module table */
 171 static const luaL_reg M[] = {
 172         {"setblocking", nixio_sock_setblocking},
 173         {"getsockopt",  nixio_sock_getsockopt},
 174         {"setsockopt",  nixio_sock_setsockopt},
 175         {NULL,                  NULL}
 176 };
 177
 178 void nixio_open_sockopt(lua_State *L) {
 179         lua_pushvalue(L, -2);
 180         luaL_register(L, NULL, M);
 181         lua_pop(L, 1);
 182
 183         luaL_getmetatable(L, NIXIO_FILE_META);
 184         lua_pushcfunction(L, nixio_sock_setblocking);
 185         lua_setfield(L, -2, "setblocking");
 186         lua_pop(L, 1);
 187 }