1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
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2 | * |
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3 | * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu> |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify |
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6 | * it under the terms of the GNU General Public License as published by |
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7 | * the Free Software Foundation; either version 2 of the License, or |
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8 | * (at your option) any later version. |
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9 | * |
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10 | * This program is distributed in the hope that it will be useful, |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | * GNU General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License |
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16 | * along with this program; if not, write to the Free Software |
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17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 | * |
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19 | */ |
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20 | |
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21 | |
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22 | #include "config.h" |
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23 | |
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24 | #include <stdlib.h> |
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25 | #include <stdio.h> |
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26 | #include <fcntl.h> |
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27 | #include <unistd.h> |
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28 | #ifdef HAVE_STROPTS_H |
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29 | #include <stropts.h> |
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30 | #endif |
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31 | #include <string.h> |
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32 | #ifdef HAVE_SYS_SOCKET_H |
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33 | #include <sys/socket.h> |
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34 | #endif |
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35 | #ifdef HAVE_SYS_SOCKIO_H |
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36 | #include <sys/sockio.h> |
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37 | #endif |
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38 | #include <netdb.h> |
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39 | #include <sys/ioctl.h> |
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40 | #include <net/if.h> |
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41 | |
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42 | #ifndef G_OS_WIN32 |
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43 | #include <sys/select.h> |
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44 | #include <netinet/in.h> |
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45 | #include <arpa/inet.h> |
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46 | #else |
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47 | #include <winsock2.h> |
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48 | #include <ws2tcpip.h> |
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49 | #endif |
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50 | |
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51 | #include <glib-object.h> |
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52 | |
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53 | #include "gdm-address.h" |
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54 | |
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55 | struct _GdmAddress |
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56 | { |
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57 | struct sockaddr_storage *ss; |
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58 | }; |
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59 | |
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60 | /* Register GdmAddress in the glib type system */ |
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61 | GType |
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62 | gdm_address_get_type (void) |
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63 | { |
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64 | static GType addr_type = 0; |
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65 | |
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66 | if (addr_type == 0) { |
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67 | addr_type = g_boxed_type_register_static ("GdmAddress", |
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68 | (GBoxedCopyFunc) gdm_address_copy, |
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69 | (GBoxedFreeFunc) gdm_address_free); |
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70 | } |
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71 | |
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72 | return addr_type; |
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73 | } |
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74 | |
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75 | /** |
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76 | * gdm_address_get_family_type: |
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77 | * @address: A pointer to a #GdmAddress |
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78 | * |
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79 | * Use this function to retrive the address family of @address. |
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80 | * |
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81 | * Return value: The address family of @address. |
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82 | **/ |
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83 | int |
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84 | gdm_address_get_family_type (GdmAddress *address) |
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85 | { |
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86 | g_return_val_if_fail (address != NULL, -1); |
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87 | |
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88 | return address->ss->ss_family; |
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89 | } |
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90 | |
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91 | |
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92 | /** |
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93 | * gdm_address_new_from_sockaddr: |
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94 | * @sa: A pointer to a sockaddr. |
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95 | * @size: size of sockaddr in bytes. |
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96 | * |
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97 | * Creates a new #GdmAddress from @sa. |
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98 | * |
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99 | * Return value: The new #GdmAddress |
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100 | * or %NULL if @sa was invalid or the address family isn't supported. |
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101 | **/ |
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102 | GdmAddress * |
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103 | gdm_address_new_from_sockaddr (struct sockaddr *sa, |
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104 | size_t size) |
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105 | { |
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106 | GdmAddress *addr; |
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107 | |
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108 | g_return_val_if_fail (sa != NULL, NULL); |
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109 | g_return_val_if_fail (size >= sizeof (struct sockaddr), NULL); |
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110 | g_return_val_if_fail (size <= sizeof (struct sockaddr_storage), NULL); |
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111 | |
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112 | addr = g_new0 (GdmAddress, 1); |
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113 | addr->ss = g_new0 (struct sockaddr_storage, 1); |
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114 | memcpy (addr->ss, sa, size); |
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115 | |
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116 | return addr; |
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117 | } |
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118 | |
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119 | /** |
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120 | * gdm_address_get_sockaddr_storage: |
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121 | * @address: A #GdmAddress |
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122 | * |
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123 | * This function tanslates @address into a equivalent |
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124 | * sockaddr_storage |
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125 | * |
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126 | * Return value: A newly allocated sockaddr_storage structure the caller must free |
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127 | * or %NULL if @address did not point to a valid #GdmAddress. |
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128 | **/ |
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129 | struct sockaddr_storage * |
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130 | gdm_address_get_sockaddr_storage (GdmAddress *address) |
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131 | { |
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132 | struct sockaddr_storage *ss; |
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133 | |
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134 | g_return_val_if_fail (address != NULL, NULL); |
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135 | g_return_val_if_fail (address->ss != NULL, NULL); |
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136 | |
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137 | ss = g_memdup (address->ss, sizeof (struct sockaddr_storage)); |
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138 | |
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139 | return ss; |
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140 | } |
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141 | |
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142 | struct sockaddr_storage * |
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143 | gdm_address_peek_sockaddr_storage (GdmAddress *address) |
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144 | { |
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145 | g_return_val_if_fail (address != NULL, NULL); |
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146 | |
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147 | return address->ss; |
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148 | } |
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149 | |
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150 | static gboolean |
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151 | v4_v4_equal (const struct sockaddr_in *a, |
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152 | const struct sockaddr_in *b) |
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153 | { |
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154 | return a->sin_addr.s_addr == b->sin_addr.s_addr; |
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155 | } |
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156 | |
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157 | #ifdef ENABLE_IPV6 |
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158 | static gboolean |
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159 | v6_v6_equal (struct sockaddr_in6 *a, |
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160 | struct sockaddr_in6 *b) |
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161 | { |
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162 | return IN6_ARE_ADDR_EQUAL (&a->sin6_addr, &b->sin6_addr); |
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163 | } |
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164 | #endif |
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165 | |
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166 | #define SA(__s) ((struct sockaddr *) __s) |
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167 | #define SIN(__s) ((struct sockaddr_in *) __s) |
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168 | #define SIN6(__s) ((struct sockaddr_in6 *) __s) |
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169 | |
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170 | gboolean |
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171 | gdm_address_equal (GdmAddress *a, |
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172 | GdmAddress *b) |
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173 | { |
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174 | guint8 fam_a; |
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175 | guint8 fam_b; |
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176 | |
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177 | g_return_val_if_fail (a != NULL, FALSE); |
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178 | g_return_val_if_fail (a->ss != NULL, FALSE); |
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179 | g_return_val_if_fail (b != NULL, FALSE); |
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180 | g_return_val_if_fail (b->ss != NULL, FALSE); |
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181 | |
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182 | fam_a = a->ss->ss_family; |
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183 | fam_b = b->ss->ss_family; |
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184 | |
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185 | if (fam_a == AF_INET && fam_b == AF_INET) { |
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186 | return v4_v4_equal (SIN (a->ss), SIN (b->ss)); |
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187 | } |
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188 | #ifdef ENABLE_IPV6 |
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189 | else if (fam_a == AF_INET6 && fam_b == AF_INET6) { |
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190 | return v6_v6_equal (SIN6 (a->ss), SIN6 (b->ss)); |
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191 | } |
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192 | #endif |
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193 | return FALSE; |
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194 | } |
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195 | |
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196 | gboolean |
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197 | gdm_address_get_hostname (GdmAddress *address, |
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198 | char **hostnamep) |
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199 | { |
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200 | char host [NI_MAXHOST]; |
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201 | int res; |
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202 | gboolean ret; |
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203 | |
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204 | g_return_val_if_fail (address != NULL, FALSE); |
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205 | g_return_val_if_fail (address->ss != NULL, FALSE); |
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206 | |
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207 | ret = FALSE; |
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208 | |
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209 | host [0] = '\0'; |
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210 | res = getnameinfo ((const struct sockaddr *)address->ss, |
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211 | sizeof (struct sockaddr_storage), |
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212 | host, sizeof (host), |
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213 | NULL, 0, |
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214 | 0); |
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215 | if (res == 0) { |
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216 | ret = TRUE; |
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217 | goto done; |
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218 | } else { |
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219 | g_warning ("Unable lookup hostname: %s", gai_strerror (res)); |
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220 | gdm_address_debug (address); |
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221 | } |
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222 | |
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223 | /* try numeric? */ |
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224 | |
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225 | done: |
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226 | if (hostnamep != NULL) { |
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227 | *hostnamep = g_strdup (host); |
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228 | } |
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229 | |
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230 | return ret; |
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231 | } |
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232 | |
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233 | gboolean |
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234 | gdm_address_get_numeric_info (GdmAddress *address, |
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235 | char **hostp, |
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236 | char **servp) |
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237 | { |
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238 | char host [NI_MAXHOST]; |
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239 | char serv [NI_MAXSERV]; |
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240 | int res; |
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241 | gboolean ret; |
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242 | |
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243 | g_return_val_if_fail (address != NULL, FALSE); |
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244 | g_return_val_if_fail (address->ss != NULL, FALSE); |
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245 | |
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246 | ret = FALSE; |
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247 | |
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248 | host [0] = '\0'; |
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249 | serv [0] = '\0'; |
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250 | res = getnameinfo ((const struct sockaddr *)address->ss, |
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251 | sizeof (struct sockaddr_storage), |
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252 | host, sizeof (host), |
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253 | serv, sizeof (serv), |
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254 | NI_NUMERICHOST | NI_NUMERICSERV); |
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255 | if (res != 0) { |
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256 | g_warning ("Unable lookup numeric info: %s", gai_strerror (res)); |
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257 | } else { |
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258 | ret = TRUE; |
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259 | } |
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260 | |
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261 | if (servp != NULL) { |
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262 | *servp = g_strdup (serv); |
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263 | } |
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264 | if (hostp != NULL) { |
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265 | *hostp = g_strdup (host); |
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266 | } |
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267 | |
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268 | return ret; |
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269 | } |
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270 | |
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271 | gboolean |
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272 | gdm_address_is_loopback (GdmAddress *address) |
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273 | { |
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274 | g_return_val_if_fail (address != NULL, FALSE); |
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275 | g_return_val_if_fail (address->ss != NULL, FALSE); |
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276 | |
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277 | switch (address->ss->ss_family){ |
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278 | #ifdef AF_INET6 |
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279 | case AF_INET6: |
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280 | return IN6_IS_ADDR_LOOPBACK (&((struct sockaddr_in6 *)address->ss)->sin6_addr); |
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281 | break; |
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282 | #endif |
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283 | case AF_INET: |
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284 | return (INADDR_LOOPBACK == htonl (((struct sockaddr_in *)address->ss)->sin_addr.s_addr)); |
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285 | break; |
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286 | default: |
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287 | break; |
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288 | } |
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289 | |
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290 | return FALSE; |
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291 | } |
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292 | |
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293 | static void |
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294 | add_local_siocgifconf (GList **list) |
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295 | { |
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296 | struct ifconf ifc; |
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297 | struct ifreq ifreq; |
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298 | struct ifreq *ifr; |
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299 | struct ifreq *the_end; |
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300 | int sock; |
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301 | char buf[BUFSIZ]; |
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302 | |
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303 | if ((sock = socket (PF_INET, SOCK_DGRAM, 0)) < 0) { |
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304 | perror ("socket"); |
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305 | return; |
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306 | } |
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307 | |
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308 | ifc.ifc_len = sizeof (buf); |
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309 | ifc.ifc_buf = buf; |
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310 | if (ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0) { |
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311 | perror ("SIOCGIFCONF"); |
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312 | close (sock); |
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313 | return; |
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314 | } |
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315 | |
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316 | /* Get IP address of each active IP network interface. */ |
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317 | the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); |
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318 | |
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319 | for (ifr = ifc.ifc_req; ifr < the_end; ifr++) { |
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320 | if (ifr->ifr_addr.sa_family == AF_INET) { |
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321 | /* IP net interface */ |
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322 | ifreq = *ifr; |
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323 | |
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324 | if (ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) { |
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325 | perror("SIOCGIFFLAGS"); |
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326 | } else if (ifreq.ifr_flags & IFF_UP) { /* active interface */ |
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327 | if (ioctl (sock, SIOCGIFADDR, (char *) &ifreq) < 0) { |
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328 | perror("SIOCGIFADDR"); |
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329 | } else { |
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330 | GdmAddress *address; |
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331 | address = gdm_address_new_from_sockaddr ((struct sockaddr *)&ifreq.ifr_addr, |
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332 | sizeof (struct sockaddr)); |
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333 | |
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334 | gdm_address_debug (address); |
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335 | |
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336 | *list = g_list_append (*list, address); |
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337 | } |
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338 | } |
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339 | } |
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340 | |
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341 | /* Support for variable-length addresses. */ |
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342 | #ifdef HAS_SA_LEN |
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343 | ifr = (struct ifreq *) ((caddr_t) ifr |
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344 | + ifr->ifr_addr.sa_len - sizeof(struct sockaddr)); |
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345 | #endif |
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346 | } |
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347 | |
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348 | close (sock); |
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349 | } |
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350 | |
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351 | static void |
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352 | add_local_addrinfo (GList **list) |
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353 | { |
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354 | char hostbuf[BUFSIZ]; |
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355 | struct addrinfo *result; |
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356 | struct addrinfo *res; |
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357 | struct addrinfo hints; |
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358 | |
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359 | hostbuf[BUFSIZ-1] = '\0'; |
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360 | if (gethostname (hostbuf, BUFSIZ-1) != 0) { |
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361 | g_debug ("%s: Could not get server hostname, using localhost", "gdm_peek_local_address_list"); |
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362 | snprintf (hostbuf, BUFSIZ-1, "localhost"); |
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363 | } |
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364 | |
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365 | memset (&hints, 0, sizeof (hints)); |
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366 | hints.ai_family = AF_UNSPEC; |
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367 | hints.ai_flags = AI_CANONNAME; |
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368 | |
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369 | g_debug ("GdmAddress: looking up hostname: %s", hostbuf); |
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370 | result = NULL; |
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371 | if (getaddrinfo (hostbuf, NULL, &hints, &result) != 0) { |
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372 | g_debug ("%s: Could not get address from hostname!", "gdm_peek_local_address_list"); |
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373 | |
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374 | return; |
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375 | } |
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376 | |
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377 | for (res = result; res != NULL; res = res->ai_next) { |
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378 | GdmAddress *address; |
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379 | |
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380 | g_debug ("family=%d sock_type=%d protocol=%d flags=0x%x canonname=%s\n", |
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381 | res->ai_family, |
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382 | res->ai_socktype, |
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383 | res->ai_protocol, |
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384 | res->ai_flags, |
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385 | res->ai_canonname); |
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386 | address = gdm_address_new_from_sockaddr (res->ai_addr, res->ai_addrlen); |
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387 | *list = g_list_append (*list, address); |
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388 | } |
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389 | |
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390 | if (result != NULL) { |
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391 | freeaddrinfo (result); |
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392 | result = NULL; |
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393 | } |
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394 | } |
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395 | |
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396 | const GList * |
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397 | gdm_address_peek_local_list (void) |
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398 | { |
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399 | static GList *list = NULL; |
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400 | static time_t last_time = 0; |
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401 | |
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402 | /* Don't check more then every 5 seconds */ |
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403 | if (last_time + 5 > time (NULL)) { |
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404 | return list; |
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405 | } |
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406 | |
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407 | g_list_foreach (list, (GFunc)gdm_address_free, NULL); |
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408 | g_list_free (list); |
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409 | list = NULL; |
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410 | |
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411 | last_time = time (NULL); |
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412 | |
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413 | add_local_siocgifconf (&list); |
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414 | add_local_addrinfo (&list); |
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415 | |
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416 | return list; |
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417 | } |
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418 | |
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419 | gboolean |
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420 | gdm_address_is_local (GdmAddress *address) |
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421 | { |
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422 | const GList *list; |
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423 | |
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424 | if (gdm_address_is_loopback (address)) { |
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425 | return TRUE; |
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426 | } |
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427 | |
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428 | list = gdm_address_peek_local_list (); |
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429 | |
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430 | while (list != NULL) { |
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431 | GdmAddress *addr = list->data; |
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432 | |
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433 | if (gdm_address_equal (address, addr)) { |
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434 | return TRUE; |
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435 | } |
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436 | |
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437 | list = list->next; |
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438 | } |
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439 | |
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440 | return FALSE; |
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441 | } |
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442 | |
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443 | /** |
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444 | * gdm_address_copy: |
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445 | * @address: A #GdmAddress. |
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446 | * |
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447 | * Duplicates @address. |
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448 | * |
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449 | * Return value: Duplicated @address or %NULL if @address was not valid. |
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450 | **/ |
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451 | GdmAddress * |
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452 | gdm_address_copy (GdmAddress *address) |
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453 | { |
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454 | GdmAddress *addr; |
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455 | |
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456 | g_return_val_if_fail (address != NULL, NULL); |
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457 | |
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458 | addr = g_new0 (GdmAddress, 1); |
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459 | addr->ss = g_memdup (address->ss, sizeof (struct sockaddr_storage)); |
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460 | |
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461 | return addr; |
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462 | } |
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463 | |
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464 | /** |
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465 | * gdm_address_free: |
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466 | * @address: A #GdmAddress. |
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467 | * |
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468 | * Frees the memory allocated for @address. |
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469 | **/ |
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470 | void |
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471 | gdm_address_free (GdmAddress *address) |
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472 | { |
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473 | g_return_if_fail (address != NULL); |
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474 | |
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475 | g_free (address->ss); |
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476 | g_free (address); |
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477 | } |
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478 | |
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479 | /* for debugging */ |
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480 | static const char * |
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481 | address_family_str (GdmAddress *address) |
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482 | { |
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483 | const char *str; |
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484 | switch (address->ss->ss_family) { |
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485 | case AF_INET: |
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486 | str = "inet"; |
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487 | break; |
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488 | case AF_INET6: |
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489 | str = "inet6"; |
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490 | break; |
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491 | case AF_UNIX: |
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492 | str = "unix"; |
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493 | break; |
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494 | case AF_UNSPEC: |
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495 | str = "unspecified"; |
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496 | break; |
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497 | default: |
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498 | str = "unknown"; |
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499 | break; |
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500 | } |
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501 | return str; |
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502 | } |
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503 | |
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504 | void |
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505 | gdm_address_debug (GdmAddress *address) |
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506 | { |
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507 | char *hostname; |
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508 | char *host; |
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509 | char *port; |
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510 | |
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511 | g_return_if_fail (address != NULL); |
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512 | |
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513 | hostname = NULL; |
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514 | host = NULL; |
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515 | port = NULL; |
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516 | |
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517 | gdm_address_get_hostname (address, &hostname); |
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518 | gdm_address_get_numeric_info (address, &host, &port); |
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519 | |
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520 | g_debug ("Address family:%d (%s) hostname:%s host:%s port:%s local:%d loopback:%d", |
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521 | address->ss->ss_family, |
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522 | address_family_str (address), |
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523 | hostname, |
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524 | host, |
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525 | port, |
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526 | gdm_address_is_local (address), |
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527 | gdm_address_is_loopback (address)); |
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528 | |
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529 | g_free (hostname); |
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530 | g_free (host); |
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531 | g_free (port); |
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532 | } |
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