prosody
898554323338
util-src/net.c

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util-src/net.c @ 12314:898554323338

util.poll: Restructure to make adding additional system APIs easier
author Kim Alvefur <zash@zash.se>
date Wed, 23 Feb 2022 20:30:22 +0100
parent 10921:6eb5d2bb11af
child 12575:1f6f05a98fcd
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rev   line source
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1 /* Prosody IM
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2 --
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3 -- This project is MIT/X11 licensed. Please see the
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4 -- COPYING file in the source package for more information.
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5 --
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6 -- Copyright (C) 2012 Paul Aurich
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7 -- Copyright (C) 2013 Matthew Wild
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8 -- Copyright (C) 2013 Florian Zeitz
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9 --
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10 */
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11
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12 #ifndef _GNU_SOURCE
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13 #define _GNU_SOURCE
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14 #endif
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15
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16 #include <stddef.h>
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17 #include <string.h>
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18 #include <errno.h>
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19
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20 #ifndef _WIN32
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21 #include <sys/ioctl.h>
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22 #include <sys/types.h>
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23 #include <sys/socket.h>
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24 #include <net/if.h>
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25 #include <ifaddrs.h>
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26 #include <arpa/inet.h>
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27 #include <netinet/in.h>
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28 #endif
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29
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30 #include <lua.h>
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31 #include <lauxlib.h>
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32
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33 #if (LUA_VERSION_NUM == 501)
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34 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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35 #endif
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36 #if (LUA_VERSION_NUM < 504)
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37 #define luaL_pushfail lua_pushnil
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38 #endif
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39
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40 /* Enumerate all locally configured IP addresses */
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41
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42 static const char *const type_strings[] = {
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43 "both",
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44 "ipv4",
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45 "ipv6",
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46 NULL
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47 };
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48
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49 static int lc_local_addresses(lua_State *L) {
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50 #ifndef _WIN32
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51 /* Link-local IPv4 addresses; see RFC 3927 and RFC 5735 */
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52 const uint32_t ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */
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53 const uint32_t ip4_mask = htonl(0xffff0000);
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54 struct ifaddrs *addr = NULL, *a;
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55 #endif
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56 int n = 1;
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57 int type = luaL_checkoption(L, 1, "both", type_strings);
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58 const char link_local = lua_toboolean(L, 2); /* defaults to 0 (false) */
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59 const char ipv4 = (type == 0 || type == 1);
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60 const char ipv6 = (type == 0 || type == 2);
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61
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62 #ifndef _WIN32
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63
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64 if(getifaddrs(&addr) < 0) {
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65 luaL_pushfail(L);
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66 lua_pushfstring(L, "getifaddrs failed (%d): %s", errno,
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67 strerror(errno));
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68 return 2;
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69 }
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70
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71 #endif
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72 lua_newtable(L);
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73
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74 #ifndef _WIN32
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75
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76 for(a = addr; a; a = a->ifa_next) {
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77 int family;
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78 char ipaddr[INET6_ADDRSTRLEN];
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79 const char *tmp = NULL;
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80
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81 if(a->ifa_addr == NULL || a->ifa_flags & IFF_LOOPBACK) {
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82 continue;
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83 }
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84
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85 family = a->ifa_addr->sa_family;
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86
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87 if(ipv4 && family == AF_INET) {
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88 struct sockaddr_in *sa = (struct sockaddr_in *)a->ifa_addr;
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90 if(!link_local && ((sa->sin_addr.s_addr & ip4_mask) == ip4_linklocal)) {
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91 continue;
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92 }
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93
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94 tmp = inet_ntop(family, &sa->sin_addr, ipaddr, sizeof(ipaddr));
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95 } else if(ipv6 && family == AF_INET6) {
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96 struct sockaddr_in6 *sa = (struct sockaddr_in6 *)a->ifa_addr;
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97
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98 if(!link_local && IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr)) {
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99 continue;
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100 }
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102 if(IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&sa->sin6_addr)) {
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103 continue;
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104 }
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105
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106 tmp = inet_ntop(family, &sa->sin6_addr, ipaddr, sizeof(ipaddr));
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107 }
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108
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109 if(tmp != NULL) {
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110 lua_pushstring(L, tmp);
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111 lua_rawseti(L, -2, n++);
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112 }
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113
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114 /* TODO: Error reporting? */
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115 }
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116
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117 freeifaddrs(addr);
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118 #else
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119
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120 if(ipv4) {
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121 lua_pushstring(L, "0.0.0.0");
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122 lua_rawseti(L, -2, n++);
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123 }
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124
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125 if(ipv6) {
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126 lua_pushstring(L, "::");
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127 lua_rawseti(L, -2, n++);
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128 }
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129
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130 #endif
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131 return 1;
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132 }
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133
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134 static int lc_pton(lua_State *L) {
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135 char buf[16];
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136 const char *ipaddr = luaL_checkstring(L, 1);
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137 int errno_ = 0;
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138 int family = strchr(ipaddr, ':') ? AF_INET6 : AF_INET;
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139
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140 switch(inet_pton(family, ipaddr, &buf)) {
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141 case 1:
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142 lua_pushlstring(L, buf, family == AF_INET6 ? 16 : 4);
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143 return 1;
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144
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145 case -1:
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146 errno_ = errno;
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147 luaL_pushfail(L);
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148 lua_pushstring(L, strerror(errno_));
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149 lua_pushinteger(L, errno_);
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150 return 3;
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151
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152 default:
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153 case 0:
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154 luaL_pushfail(L);
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155 lua_pushstring(L, strerror(EINVAL));
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156 lua_pushinteger(L, EINVAL);
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157 return 3;
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158 }
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159
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160 }
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161
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162 static int lc_ntop(lua_State *L) {
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163 char buf[INET6_ADDRSTRLEN];
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164 int family;
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165 int errno_;
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166 size_t l;
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167 const char *ipaddr = luaL_checklstring(L, 1, &l);
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168
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169 if(l == 16) {
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170 family = AF_INET6;
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171 }
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172 else if(l == 4) {
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173 family = AF_INET;
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174 }
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175 else {
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176 luaL_pushfail(L);
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177 lua_pushstring(L, strerror(EAFNOSUPPORT));
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178 lua_pushinteger(L, EAFNOSUPPORT);
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179 return 3;
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180 }
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181
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182 if(!inet_ntop(family, ipaddr, buf, INET6_ADDRSTRLEN))
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183 {
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184 errno_ = errno;
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185 luaL_pushfail(L);
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186 lua_pushstring(L, strerror(errno_));
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187 lua_pushinteger(L, errno_);
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188 return 3;
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189 }
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190
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191 lua_pushstring(L, (const char *)(&buf));
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192 return 1;
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193 }
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194
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195 int luaopen_util_net(lua_State *L) {
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196 #if (LUA_VERSION_NUM > 501)
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197 luaL_checkversion(L);
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198 #endif
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199 luaL_Reg exports[] = {
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200 { "local_addresses", lc_local_addresses },
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201 { "pton", lc_pton },
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202 { "ntop", lc_ntop },
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203 { NULL, NULL }
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204 };
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205
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206 lua_createtable(L, 0, 1);
6789
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diff changeset
207 luaL_setfuncs(L, exports, 0);
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208 return 1;
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209 }