prosody
d779c55058c6
util-src/net.c

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util-src/net.c @ 6945:d779c55058c6

util.cache: Small update to prefix private fields with an underscore, add a :count() method (same as util.queue) and add an optional on_evict callback
author Matthew Wild <mwild1@gmail.com>
date Thu, 26 Nov 2015 00:07:48 +0000
parent 6789:6b180e77c97a
child 7818:54669df178c2
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 #include <stddef.h>
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13 #include <string.h>
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14 #include <errno.h>
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15
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16 #ifndef _WIN32
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17 #include <sys/ioctl.h>
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18 #include <sys/types.h>
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19 #include <sys/socket.h>
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20 #include <net/if.h>
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21 #include <ifaddrs.h>
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22 #include <arpa/inet.h>
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23 #include <netinet/in.h>
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24 #endif
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25
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26 #include <lua.h>
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27 #include <lauxlib.h>
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28
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29 #if (LUA_VERSION_NUM == 501)
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30 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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31 #endif
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32
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33 /* Enumerate all locally configured IP addresses */
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34
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35 const char* const type_strings[] = {
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36 "both",
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37 "ipv4",
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38 "ipv6",
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39 NULL
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40 };
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41
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42 static int lc_local_addresses(lua_State* L) {
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43 #ifndef _WIN32
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44 /* Link-local IPv4 addresses; see RFC 3927 and RFC 5735 */
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45 const long ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */
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46 const long ip4_mask = htonl(0xffff0000);
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47 struct ifaddrs* addr = NULL, *a;
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48 #endif
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49 int n = 1;
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50 int type = luaL_checkoption(L, 1, "both", type_strings);
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51 const char link_local = lua_toboolean(L, 2); /* defaults to 0 (false) */
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52 const char ipv4 = (type == 0 || type == 1);
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53 const char ipv6 = (type == 0 || type == 2);
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54
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55 #ifndef _WIN32
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56
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57 if(getifaddrs(&addr) < 0) {
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58 lua_pushnil(L);
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59 lua_pushfstring(L, "getifaddrs failed (%d): %s", errno,
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60 strerror(errno));
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61 return 2;
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62 }
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63
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64 #endif
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65 lua_newtable(L);
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66
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67 #ifndef _WIN32
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68
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69 for(a = addr; a; a = a->ifa_next) {
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70 int family;
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71 char ipaddr[INET6_ADDRSTRLEN];
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72 const char* tmp = NULL;
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73
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74 if(a->ifa_addr == NULL || a->ifa_flags & IFF_LOOPBACK) {
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75 continue;
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76 }
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78 family = a->ifa_addr->sa_family;
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79
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80 if(ipv4 && family == AF_INET) {
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81 struct sockaddr_in* sa = (struct sockaddr_in*)a->ifa_addr;
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83 if(!link_local && ((sa->sin_addr.s_addr & ip4_mask) == ip4_linklocal)) {
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84 continue;
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85 }
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86
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87 tmp = inet_ntop(family, &sa->sin_addr, ipaddr, sizeof(ipaddr));
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88 } else if(ipv6 && family == AF_INET6) {
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89 struct sockaddr_in6* sa = (struct sockaddr_in6*)a->ifa_addr;
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90
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91 if(!link_local && IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr)) {
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92 continue;
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93 }
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94
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95 if(IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&sa->sin6_addr)) {
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96 continue;
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97 }
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98
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99 tmp = inet_ntop(family, &sa->sin6_addr, ipaddr, sizeof(ipaddr));
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100 }
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101
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102 if(tmp != NULL) {
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103 lua_pushstring(L, tmp);
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104 lua_rawseti(L, -2, n++);
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105 }
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106
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107 /* TODO: Error reporting? */
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108 }
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109
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110 freeifaddrs(addr);
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111 #else
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112
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113 if(ipv4) {
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114 lua_pushstring(L, "0.0.0.0");
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115 lua_rawseti(L, -2, n++);
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116 }
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117
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118 if(ipv6) {
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119 lua_pushstring(L, "::");
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120 lua_rawseti(L, -2, n++);
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121 }
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122
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123 #endif
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124 return 1;
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125 }
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126
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127 int luaopen_util_net(lua_State* L) {
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128 luaL_Reg exports[] = {
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129 { "local_addresses", lc_local_addresses },
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130 { NULL, NULL }
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131 };
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132
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133 lua_newtable(L);
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134 luaL_setfuncs(L, exports, 0);
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135 return 1;
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136 }