prosody
99d85731e3ee
util-src/net.c

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util-src/net.c @ 8397:99d85731e3ee

util.cache: Add a method to resize the cache
author Kim Alvefur <zash@zash.se>
date Sat, 18 Nov 2017 21:35:31 +0100
parent 7969:1c6a07606309
child 8426:8b612ec00e4a
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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69
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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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78
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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 int luaopen_util_net(lua_State *L) {
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129 #if (LUA_VERSION_NUM > 501)
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130 luaL_checkversion(L);
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131 #endif
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132 luaL_Reg exports[] = {
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133 { "local_addresses", lc_local_addresses },
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134 { NULL, NULL }
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135 };
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136
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137 lua_createtable(L, 0, 1);
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138 luaL_setfuncs(L, exports, 0);
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139 return 1;
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140 }