prosody
519dea077d20
util-src/net.c

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util-src/net.c @ 9091:519dea077d20

util.dataforms: Allow passing dynamically generated options as values (fixes traceback) This is awkward but there’s currently no better way to do this, short of dynamically generating the entire form each time
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 22:05:40 +0200
parent 8426:8b612ec00e4a
child 9150:c1d5f52274cf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 #define _GNU_SOURCE
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13 #include <stddef.h>
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14 #include <string.h>
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15 #include <errno.h>
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16
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17 #ifndef _WIN32
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18 #include <sys/ioctl.h>
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19 #include <sys/types.h>
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20 #include <sys/socket.h>
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21 #include <net/if.h>
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22 #include <ifaddrs.h>
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23 #include <arpa/inet.h>
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24 #include <netinet/in.h>
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25 #endif
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26
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27 #include <lua.h>
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28 #include <lauxlib.h>
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29
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30 #if (LUA_VERSION_NUM == 501)
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31 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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32 #endif
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33
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34 /* Enumerate all locally configured IP addresses */
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35
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36 const char *const type_strings[] = {
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37 "both",
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38 "ipv4",
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39 "ipv6",
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40 NULL
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41 };
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42
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43 static int lc_local_addresses(lua_State *L) {
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44 #ifndef _WIN32
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45 /* Link-local IPv4 addresses; see RFC 3927 and RFC 5735 */
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46 const long ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */
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47 const long ip4_mask = htonl(0xffff0000);
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48 struct ifaddrs *addr = NULL, *a;
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49 #endif
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50 int n = 1;
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51 int type = luaL_checkoption(L, 1, "both", type_strings);
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52 const char link_local = lua_toboolean(L, 2); /* defaults to 0 (false) */
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53 const char ipv4 = (type == 0 || type == 1);
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54 const char ipv6 = (type == 0 || type == 2);
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55
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56 #ifndef _WIN32
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57
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58 if(getifaddrs(&addr) < 0) {
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59 lua_pushnil(L);
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60 lua_pushfstring(L, "getifaddrs failed (%d): %s", errno,
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61 strerror(errno));
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62 return 2;
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63 }
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64
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65 #endif
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66 lua_newtable(L);
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67
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68 #ifndef _WIN32
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70 for(a = addr; a; a = a->ifa_next) {
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71 int family;
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72 char ipaddr[INET6_ADDRSTRLEN];
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73 const char *tmp = NULL;
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74
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75 if(a->ifa_addr == NULL || a->ifa_flags & IFF_LOOPBACK) {
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76 continue;
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77 }
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79 family = a->ifa_addr->sa_family;
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80
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81 if(ipv4 && family == AF_INET) {
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82 struct sockaddr_in *sa = (struct sockaddr_in *)a->ifa_addr;
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83
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84 if(!link_local && ((sa->sin_addr.s_addr & ip4_mask) == ip4_linklocal)) {
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85 continue;
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86 }
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87
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88 tmp = inet_ntop(family, &sa->sin_addr, ipaddr, sizeof(ipaddr));
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89 } else if(ipv6 && family == AF_INET6) {
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90 struct sockaddr_in6 *sa = (struct sockaddr_in6 *)a->ifa_addr;
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91
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92 if(!link_local && IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr)) {
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93 continue;
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94 }
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95
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96 if(IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&sa->sin6_addr)) {
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97 continue;
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98 }
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99
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100 tmp = inet_ntop(family, &sa->sin6_addr, ipaddr, sizeof(ipaddr));
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101 }
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102
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103 if(tmp != NULL) {
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104 lua_pushstring(L, tmp);
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105 lua_rawseti(L, -2, n++);
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106 }
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107
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108 /* TODO: Error reporting? */
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109 }
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110
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111 freeifaddrs(addr);
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112 #else
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113
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114 if(ipv4) {
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115 lua_pushstring(L, "0.0.0.0");
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116 lua_rawseti(L, -2, n++);
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117 }
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118
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119 if(ipv6) {
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120 lua_pushstring(L, "::");
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121 lua_rawseti(L, -2, n++);
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122 }
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123
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124 #endif
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125 return 1;
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126 }
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127
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128 static int lc_pton(lua_State *L) {
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129 char buf[16];
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130 const char *ipaddr = luaL_checkstring(L, 1);
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131 int errno_ = 0;
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132 int family = strchr(ipaddr, ':') ? AF_INET6 : AF_INET;
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133
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134 switch(inet_pton(family, ipaddr, &buf)) {
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135 case 1:
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136 lua_pushlstring(L, buf, family == AF_INET6 ? 16 : 4);
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137 return 1;
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138
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139 case -1:
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140 errno_ = errno;
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141 lua_pushnil(L);
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142 lua_pushstring(L, strerror(errno_));
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143 lua_pushinteger(L, errno_);
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144 return 3;
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145
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146 default:
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147 case 0:
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148 lua_pushnil(L);
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149 lua_pushstring(L, strerror(EINVAL));
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150 lua_pushinteger(L, EINVAL);
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151 return 3;
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152 }
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153
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154 }
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155
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156 static int lc_ntop(lua_State *L) {
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157 char buf[INET6_ADDRSTRLEN];
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158 int family;
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159 int errno_;
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160 size_t l;
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161 const char *ipaddr = luaL_checklstring(L, 1, &l);
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162
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163 if(l == 16) {
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164 family = AF_INET6;
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165 }
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166 else if(l == 4) {
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167 family = AF_INET;
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168 }
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169 else {
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170 lua_pushnil(L);
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171 lua_pushstring(L, strerror(EAFNOSUPPORT));
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172 lua_pushinteger(L, EAFNOSUPPORT);
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173 return 3;
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174 }
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175
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176 if(!inet_ntop(family, ipaddr, buf, INET6_ADDRSTRLEN))
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177 {
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178 errno_ = errno;
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179 lua_pushnil(L);
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180 lua_pushstring(L, strerror(errno_));
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181 lua_pushinteger(L, errno_);
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182 return 3;
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183 }
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184
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185 lua_pushstring(L, (const char *)(&buf));
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186 return 1;
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187 }
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188
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189 int luaopen_util_net(lua_State *L) {
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190 #if (LUA_VERSION_NUM > 501)
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191 luaL_checkversion(L);
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192 #endif
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193 luaL_Reg exports[] = {
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194 { "local_addresses", lc_local_addresses },
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195 { "pton", lc_pton },
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196 { "ntop", lc_ntop },
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197 { NULL, NULL }
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198 };
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199
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200 lua_createtable(L, 0, 1);
6789
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201 luaL_setfuncs(L, exports, 0);
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202 return 1;
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203 }