1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2002-2006 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* |
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8 | * Various utility functions. Some are copied from Gaim to support the |
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9 | * IM-modules, most are from BitlBee. |
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10 | * |
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11 | * Copyright (C) 1998-1999, Mark Spencer <markster@marko.net> |
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12 | * (and possibly other members of the Gaim team) |
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13 | * Copyright 2002-2006 Wilmer van der Gaast <wilmer@gaast.net> |
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14 | */ |
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15 | |
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16 | /* |
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17 | This program is free software; you can redistribute it and/or modify |
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18 | it under the terms of the GNU General Public License as published by |
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19 | the Free Software Foundation; either version 2 of the License, or |
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20 | (at your option) any later version. |
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21 | |
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22 | This program is distributed in the hope that it will be useful, |
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23 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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25 | GNU General Public License for more details. |
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26 | |
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27 | You should have received a copy of the GNU General Public License with |
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28 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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29 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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30 | Suite 330, Boston, MA 02111-1307 USA |
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31 | */ |
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32 | |
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33 | #define BITLBEE_CORE |
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34 | #include "nogaim.h" |
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35 | #include <stdio.h> |
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36 | #include <stdlib.h> |
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37 | #include <string.h> |
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38 | #include <ctype.h> |
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39 | #include <glib.h> |
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40 | #include <time.h> |
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41 | |
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42 | #ifdef HAVE_RESOLV_A |
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43 | #include <arpa/nameser.h> |
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44 | #include <resolv.h> |
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45 | #endif |
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46 | |
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47 | #include "ssl_client.h" |
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48 | |
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49 | void strip_linefeed(gchar *text) |
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50 | { |
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51 | int i, j; |
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52 | gchar *text2 = g_malloc(strlen(text) + 1); |
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53 | |
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54 | for (i = 0, j = 0; text[i]; i++) |
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55 | if (text[i] != '\r') |
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56 | text2[j++] = text[i]; |
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57 | text2[j] = '\0'; |
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58 | |
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59 | strcpy(text, text2); |
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60 | g_free(text2); |
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61 | } |
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62 | |
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63 | char *normalize(const char *s) |
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64 | { |
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65 | static char buf[BUF_LEN]; |
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66 | char *t, *u; |
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67 | int x = 0; |
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68 | |
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69 | g_return_val_if_fail((s != NULL), NULL); |
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70 | |
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71 | u = t = g_strdup(s); |
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72 | |
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73 | strcpy(t, s); |
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74 | g_strdown(t); |
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75 | |
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76 | while (*t && (x < BUF_LEN - 1)) { |
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77 | if (*t != ' ') { |
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78 | buf[x] = *t; |
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79 | x++; |
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80 | } |
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81 | t++; |
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82 | } |
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83 | buf[x] = '\0'; |
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84 | g_free(u); |
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85 | return buf; |
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86 | } |
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87 | |
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88 | time_t get_time(int year, int month, int day, int hour, int min, int sec) |
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89 | { |
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90 | struct tm tm; |
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91 | |
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92 | memset(&tm, 0, sizeof(struct tm)); |
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93 | tm.tm_year = year - 1900; |
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94 | tm.tm_mon = month - 1; |
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95 | tm.tm_mday = day; |
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96 | tm.tm_hour = hour; |
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97 | tm.tm_min = min; |
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98 | tm.tm_sec = sec >= 0 ? sec : time(NULL) % 60; |
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99 | |
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100 | return mktime(&tm); |
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101 | } |
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102 | |
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103 | typedef struct htmlentity |
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104 | { |
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105 | char code[7]; |
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106 | char is[3]; |
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107 | } htmlentity_t; |
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108 | |
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109 | static const htmlentity_t ent[] = |
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110 | { |
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111 | { "lt", "<" }, |
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112 | { "gt", ">" }, |
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113 | { "amp", "&" }, |
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114 | { "apos", "'" }, |
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115 | { "quot", "\"" }, |
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116 | { "aacute", "á" }, |
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117 | { "eacute", "é" }, |
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118 | { "iacute", "é" }, |
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119 | { "oacute", "ó" }, |
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120 | { "uacute", "ú" }, |
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121 | { "agrave", "à" }, |
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122 | { "egrave", "è" }, |
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123 | { "igrave", "ì" }, |
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124 | { "ograve", "ò" }, |
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125 | { "ugrave", "ù" }, |
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126 | { "acirc", "â" }, |
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127 | { "ecirc", "ê" }, |
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128 | { "icirc", "î" }, |
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129 | { "ocirc", "ô" }, |
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130 | { "ucirc", "û" }, |
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131 | { "auml", "ä" }, |
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132 | { "euml", "ë" }, |
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133 | { "iuml", "ï" }, |
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134 | { "ouml", "ö" }, |
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135 | { "uuml", "ü" }, |
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136 | { "nbsp", " " }, |
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137 | { "", "" } |
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138 | }; |
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139 | |
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140 | void strip_html( char *in ) |
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141 | { |
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142 | char *start = in; |
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143 | char *out = g_malloc( strlen( in ) + 1 ); |
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144 | char *s = out, *cs; |
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145 | int i, matched; |
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146 | int taglen; |
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147 | |
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148 | memset( out, 0, strlen( in ) + 1 ); |
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149 | |
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150 | while( *in ) |
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151 | { |
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152 | if( *in == '<' && ( isalpha( *(in+1) ) || *(in+1) == '/' ) ) |
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153 | { |
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154 | /* If in points at a < and in+1 points at a letter or a slash, this is probably |
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155 | a HTML-tag. Try to find a closing > and continue there. If the > can't be |
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156 | found, assume that it wasn't a HTML-tag after all. */ |
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157 | |
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158 | cs = in; |
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159 | |
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160 | while( *in && *in != '>' ) |
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161 | in ++; |
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162 | |
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163 | taglen = in-cs-1; /* not <0 because the above loop runs at least once */ |
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164 | if( *in ) |
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165 | { |
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166 | if( g_strncasecmp( cs+1, "b", taglen) == 0 ) |
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167 | *(s++) = '\x02'; |
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168 | else if( g_strncasecmp( cs+1, "/b", taglen) == 0 ) |
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169 | *(s++) = '\x02'; |
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170 | else if( g_strncasecmp( cs+1, "i", taglen) == 0 ) |
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171 | *(s++) = '\x1f'; |
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172 | else if( g_strncasecmp( cs+1, "/i", taglen) == 0 ) |
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173 | *(s++) = '\x1f'; |
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174 | else if( g_strncasecmp( cs+1, "br", 2) == 0 ) |
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175 | *(s++) = '\n'; |
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176 | in ++; |
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177 | } |
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178 | else |
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179 | { |
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180 | in = cs; |
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181 | *(s++) = *(in++); |
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182 | } |
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183 | } |
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184 | else if( *in == '&' ) |
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185 | { |
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186 | cs = ++in; |
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187 | while( *in && isalpha( *in ) ) |
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188 | in ++; |
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189 | |
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190 | if( *in == ';' ) in ++; |
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191 | matched = 0; |
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192 | |
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193 | for( i = 0; *ent[i].code; i ++ ) |
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194 | if( g_strncasecmp( ent[i].code, cs, strlen( ent[i].code ) ) == 0 ) |
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195 | { |
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196 | int j; |
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197 | |
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198 | for( j = 0; ent[i].is[j]; j ++ ) |
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199 | *(s++) = ent[i].is[j]; |
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200 | |
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201 | matched = 1; |
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202 | break; |
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203 | } |
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204 | |
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205 | /* None of the entities were matched, so return the string */ |
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206 | if( !matched ) |
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207 | { |
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208 | in = cs - 1; |
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209 | *(s++) = *(in++); |
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210 | } |
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211 | } |
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212 | else |
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213 | { |
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214 | *(s++) = *(in++); |
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215 | } |
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216 | } |
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217 | |
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218 | strcpy( start, out ); |
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219 | g_free( out ); |
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220 | } |
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221 | |
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222 | char *escape_html( const char *html ) |
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223 | { |
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224 | const char *c = html; |
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225 | GString *ret; |
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226 | char *str; |
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227 | |
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228 | if( html == NULL ) |
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229 | return( NULL ); |
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230 | |
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231 | ret = g_string_new( "" ); |
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232 | |
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233 | while( *c ) |
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234 | { |
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235 | switch( *c ) |
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236 | { |
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237 | case '&': |
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238 | ret = g_string_append( ret, "&" ); |
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239 | break; |
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240 | case '<': |
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241 | ret = g_string_append( ret, "<" ); |
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242 | break; |
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243 | case '>': |
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244 | ret = g_string_append( ret, ">" ); |
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245 | break; |
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246 | case '"': |
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247 | ret = g_string_append( ret, """ ); |
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248 | break; |
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249 | default: |
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250 | ret = g_string_append_c( ret, *c ); |
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251 | } |
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252 | c ++; |
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253 | } |
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254 | |
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255 | str = ret->str; |
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256 | g_string_free( ret, FALSE ); |
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257 | return( str ); |
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258 | } |
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259 | |
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260 | /* Decode%20a%20file%20name */ |
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261 | void http_decode( char *s ) |
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262 | { |
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263 | char *t; |
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264 | int i, j, k; |
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265 | |
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266 | t = g_new( char, strlen( s ) + 1 ); |
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267 | |
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268 | for( i = j = 0; s[i]; i ++, j ++ ) |
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269 | { |
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270 | if( s[i] == '%' ) |
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271 | { |
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272 | if( sscanf( s + i + 1, "%2x", &k ) ) |
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273 | { |
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274 | t[j] = k; |
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275 | i += 2; |
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276 | } |
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277 | else |
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278 | { |
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279 | *t = 0; |
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280 | break; |
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281 | } |
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282 | } |
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283 | else |
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284 | { |
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285 | t[j] = s[i]; |
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286 | } |
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287 | } |
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288 | t[j] = 0; |
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289 | |
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290 | strcpy( s, t ); |
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291 | g_free( t ); |
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292 | } |
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293 | |
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294 | /* Warning: This one explodes the string. Worst-cases can make the string 3x its original size! */ |
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295 | /* This fuction is safe, but make sure you call it safely as well! */ |
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296 | void http_encode( char *s ) |
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297 | { |
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298 | char *t; |
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299 | int i, j; |
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300 | |
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301 | t = g_strdup( s ); |
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302 | |
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303 | for( i = j = 0; t[i]; i ++, j ++ ) |
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304 | { |
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305 | /* if( t[i] <= ' ' || ((unsigned char *)t)[i] >= 128 || t[i] == '%' ) */ |
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306 | if( !isalnum( t[i] ) ) |
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307 | { |
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308 | sprintf( s + j, "%%%02X", ((unsigned char*)t)[i] ); |
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309 | j += 2; |
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310 | } |
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311 | else |
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312 | { |
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313 | s[j] = t[i]; |
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314 | } |
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315 | } |
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316 | s[j] = 0; |
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317 | |
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318 | g_free( t ); |
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319 | } |
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320 | |
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321 | /* Strip newlines from a string. Modifies the string passed to it. */ |
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322 | char *strip_newlines( char *source ) |
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323 | { |
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324 | int i; |
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325 | |
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326 | for( i = 0; source[i] != '\0'; i ++ ) |
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327 | if( source[i] == '\n' || source[i] == '\r' ) |
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328 | source[i] = ' '; |
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329 | |
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330 | return source; |
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331 | } |
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332 | |
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333 | /* Wrap an IPv4 address into IPv6 space. Not thread-safe... */ |
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334 | char *ipv6_wrap( char *src ) |
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335 | { |
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336 | static char dst[64]; |
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337 | int i; |
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338 | |
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339 | for( i = 0; src[i]; i ++ ) |
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340 | if( ( src[i] < '0' || src[i] > '9' ) && src[i] != '.' ) |
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341 | break; |
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342 | |
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343 | /* Hmm, it's not even an IP... */ |
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344 | if( src[i] ) |
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345 | return src; |
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346 | |
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347 | g_snprintf( dst, sizeof( dst ), "::ffff:%s", src ); |
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348 | |
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349 | return dst; |
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350 | } |
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351 | |
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352 | /* Unwrap an IPv4 address into IPv6 space. Thread-safe, because it's very simple. :-) */ |
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353 | char *ipv6_unwrap( char *src ) |
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354 | { |
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355 | int i; |
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356 | |
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357 | if( g_strncasecmp( src, "::ffff:", 7 ) != 0 ) |
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358 | return src; |
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359 | |
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360 | for( i = 7; src[i]; i ++ ) |
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361 | if( ( src[i] < '0' || src[i] > '9' ) && src[i] != '.' ) |
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362 | break; |
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363 | |
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364 | /* Hmm, it's not even an IP... */ |
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365 | if( src[i] ) |
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366 | return src; |
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367 | |
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368 | return ( src + 7 ); |
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369 | } |
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370 | |
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371 | /* Convert from one charset to another. |
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372 | |
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373 | from_cs, to_cs: Source and destination charsets |
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374 | src, dst: Source and destination strings |
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375 | size: Size if src. 0 == use strlen(). strlen() is not reliable for UNICODE/UTF16 strings though. |
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376 | maxbuf: Maximum number of bytes to write to dst |
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377 | |
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378 | Returns the number of bytes written to maxbuf or -1 on an error. |
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379 | */ |
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380 | signed int do_iconv( char *from_cs, char *to_cs, char *src, char *dst, size_t size, size_t maxbuf ) |
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381 | { |
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382 | GIConv cd; |
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383 | size_t res; |
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384 | size_t inbytesleft, outbytesleft; |
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385 | char *inbuf = src; |
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386 | char *outbuf = dst; |
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387 | |
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388 | cd = g_iconv_open( to_cs, from_cs ); |
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389 | if( cd == (GIConv) -1 ) |
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390 | return( -1 ); |
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391 | |
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392 | inbytesleft = size ? size : strlen( src ); |
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393 | outbytesleft = maxbuf - 1; |
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394 | res = g_iconv( cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft ); |
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395 | *outbuf = '\0'; |
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396 | g_iconv_close( cd ); |
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397 | |
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398 | if( res == (size_t) -1 ) |
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399 | return( -1 ); |
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400 | else |
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401 | return( outbuf - dst ); |
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402 | } |
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403 | |
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404 | /* A pretty reliable random number generator. Tries to use the /dev/random |
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405 | devices first, and falls back to the random number generator from libc |
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406 | when it fails. Opens randomizer devices with O_NONBLOCK to make sure a |
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407 | lack of entropy won't halt BitlBee. */ |
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408 | void random_bytes( unsigned char *buf, int count ) |
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409 | { |
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410 | static int use_dev = -1; |
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411 | |
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412 | /* Actually this probing code isn't really necessary, is it? */ |
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413 | if( use_dev == -1 ) |
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414 | { |
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415 | if( access( "/dev/random", R_OK ) == 0 || access( "/dev/urandom", R_OK ) == 0 ) |
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416 | use_dev = 1; |
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417 | else |
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418 | { |
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419 | use_dev = 0; |
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420 | srand( ( getpid() << 16 ) ^ time( NULL ) ); |
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421 | } |
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422 | } |
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423 | |
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424 | if( use_dev ) |
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425 | { |
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426 | int fd; |
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427 | |
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428 | /* At least on Linux, /dev/random can block if there's not |
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429 | enough entropy. We really don't want that, so if it can't |
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430 | give anything, use /dev/urandom instead. */ |
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431 | if( ( fd = open( "/dev/random", O_RDONLY | O_NONBLOCK ) ) >= 0 ) |
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432 | if( read( fd, buf, count ) == count ) |
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433 | { |
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434 | close( fd ); |
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435 | return; |
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436 | } |
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437 | close( fd ); |
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438 | |
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439 | /* urandom isn't supposed to block at all, but just to be |
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440 | sure. If it blocks, we'll disable use_dev and use the libc |
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441 | randomizer instead. */ |
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442 | if( ( fd = open( "/dev/urandom", O_RDONLY | O_NONBLOCK ) ) >= 0 ) |
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443 | if( read( fd, buf, count ) == count ) |
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444 | { |
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445 | close( fd ); |
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446 | return; |
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447 | } |
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448 | close( fd ); |
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449 | |
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450 | /* If /dev/random blocks once, we'll still try to use it |
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451 | again next time. If /dev/urandom also fails for some |
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452 | reason, stick with libc during this session. */ |
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453 | |
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454 | use_dev = 0; |
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455 | srand( ( getpid() << 16 ) ^ time( NULL ) ); |
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456 | } |
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457 | |
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458 | if( !use_dev ) |
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459 | { |
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460 | int i; |
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461 | |
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462 | /* Possibly the LSB of rand() isn't very random on some |
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463 | platforms. Seems okay on at least Linux and OSX though. */ |
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464 | for( i = 0; i < count; i ++ ) |
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465 | buf[i] = rand() & 0xff; |
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466 | } |
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467 | } |
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468 | |
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469 | int is_bool( char *value ) |
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470 | { |
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471 | if( *value == 0 ) |
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472 | return 0; |
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473 | |
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474 | if( ( g_strcasecmp( value, "true" ) == 0 ) || ( g_strcasecmp( value, "yes" ) == 0 ) || ( g_strcasecmp( value, "on" ) == 0 ) ) |
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475 | return 1; |
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476 | if( ( g_strcasecmp( value, "false" ) == 0 ) || ( g_strcasecmp( value, "no" ) == 0 ) || ( g_strcasecmp( value, "off" ) == 0 ) ) |
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477 | return 1; |
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478 | |
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479 | while( *value ) |
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480 | if( !isdigit( *value ) ) |
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481 | return 0; |
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482 | else |
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483 | value ++; |
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484 | |
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485 | return 1; |
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486 | } |
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487 | |
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488 | int bool2int( char *value ) |
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489 | { |
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490 | int i; |
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491 | |
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492 | if( ( g_strcasecmp( value, "true" ) == 0 ) || ( g_strcasecmp( value, "yes" ) == 0 ) || ( g_strcasecmp( value, "on" ) == 0 ) ) |
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493 | return 1; |
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494 | if( ( g_strcasecmp( value, "false" ) == 0 ) || ( g_strcasecmp( value, "no" ) == 0 ) || ( g_strcasecmp( value, "off" ) == 0 ) ) |
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495 | return 0; |
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496 | |
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497 | if( sscanf( value, "%d", &i ) == 1 ) |
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498 | return i; |
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499 | |
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500 | return 0; |
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501 | } |
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502 | |
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503 | struct ns_srv_reply *srv_lookup( char *service, char *protocol, char *domain ) |
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504 | { |
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505 | struct ns_srv_reply *reply = NULL; |
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506 | #ifdef HAVE_RESOLV_A |
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507 | char name[1024]; |
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508 | unsigned char querybuf[1024]; |
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509 | const unsigned char *buf; |
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510 | ns_msg nsh; |
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511 | ns_rr rr; |
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512 | int i, len, size; |
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513 | |
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514 | g_snprintf( name, sizeof( name ), "_%s._%s.%s", service, protocol, domain ); |
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515 | |
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516 | if( ( size = res_query( name, ns_c_in, ns_t_srv, querybuf, sizeof( querybuf ) ) ) <= 0 ) |
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517 | return NULL; |
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518 | |
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519 | if( ns_initparse( querybuf, size, &nsh ) != 0 ) |
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520 | return NULL; |
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521 | |
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522 | if( ns_parserr( &nsh, ns_s_an, 0, &rr ) != 0 ) |
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523 | return NULL; |
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524 | |
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525 | size = ns_rr_rdlen( rr ); |
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526 | buf = ns_rr_rdata( rr ); |
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527 | |
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528 | len = 0; |
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529 | for( i = 6; i < size && buf[i]; i += buf[i] + 1 ) |
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530 | len += buf[i] + 1; |
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531 | |
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532 | if( i > size ) |
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533 | return NULL; |
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534 | |
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535 | reply = g_malloc( sizeof( struct ns_srv_reply ) + len ); |
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536 | memcpy( reply->name, buf + 7, len ); |
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537 | |
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538 | for( i = buf[6]; i < len && buf[7+i]; i += buf[7+i] + 1 ) |
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539 | reply->name[i] = '.'; |
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540 | |
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541 | if( i > len ) |
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542 | { |
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543 | g_free( reply ); |
---|
544 | return NULL; |
---|
545 | } |
---|
546 | |
---|
547 | reply->prio = ( buf[0] << 8 ) | buf[1]; |
---|
548 | reply->weight = ( buf[2] << 8 ) | buf[3]; |
---|
549 | reply->port = ( buf[4] << 8 ) | buf[5]; |
---|
550 | #endif |
---|
551 | |
---|
552 | return reply; |
---|
553 | } |
---|
554 | |
---|
555 | /* Word wrapping. Yes, I know this isn't UTF-8 clean. I'm willing to take the risk. */ |
---|
556 | char *word_wrap( char *msg, int line_len ) |
---|
557 | { |
---|
558 | GString *ret = g_string_sized_new( strlen( msg ) + 16 ); |
---|
559 | |
---|
560 | while( strlen( msg ) > line_len ) |
---|
561 | { |
---|
562 | int i; |
---|
563 | |
---|
564 | /* First try to find out if there's a newline already. Don't |
---|
565 | want to add more splits than necessary. */ |
---|
566 | for( i = line_len; i > 0 && msg[i] != '\n'; i -- ); |
---|
567 | if( msg[i] == '\n' ) |
---|
568 | { |
---|
569 | g_string_append_len( ret, msg, i + 1 ); |
---|
570 | msg += i + 1; |
---|
571 | continue; |
---|
572 | } |
---|
573 | |
---|
574 | for( i = line_len; i > 0; i -- ) |
---|
575 | { |
---|
576 | if( msg[i] == '-' ) |
---|
577 | { |
---|
578 | g_string_append_len( ret, msg, i + 1 ); |
---|
579 | g_string_append_c( ret, '\n' ); |
---|
580 | msg += i + 1; |
---|
581 | break; |
---|
582 | } |
---|
583 | else if( msg[i] == ' ' ) |
---|
584 | { |
---|
585 | g_string_append_len( ret, msg, i ); |
---|
586 | g_string_append_c( ret, '\n' ); |
---|
587 | msg += i + 1; |
---|
588 | break; |
---|
589 | } |
---|
590 | } |
---|
591 | if( i == 0 ) |
---|
592 | { |
---|
593 | g_string_append_len( ret, msg, line_len ); |
---|
594 | g_string_append_c( ret, '\n' ); |
---|
595 | msg += line_len; |
---|
596 | } |
---|
597 | } |
---|
598 | g_string_append( ret, msg ); |
---|
599 | |
---|
600 | return g_string_free( ret, FALSE ); |
---|
601 | } |
---|
602 | |
---|
603 | gboolean ssl_sockerr_again( void *ssl ) |
---|
604 | { |
---|
605 | if( ssl ) |
---|
606 | return ssl_errno == SSL_AGAIN; |
---|
607 | else |
---|
608 | return sockerr_again(); |
---|
609 | } |
---|