Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/lib/hostip4.c @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22
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23 #include "curl_setup.h"
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24
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25 /***********************************************************************
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26 * Only for plain IPv4 builds
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27 **********************************************************************/
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28 #ifdef CURLRES_IPV4 /* plain IPv4 code coming up */
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29
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30 #ifdef HAVE_NETINET_IN_H
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31 #include <netinet/in.h>
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32 #endif
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33 #ifdef HAVE_NETDB_H
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34 #include <netdb.h>
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35 #endif
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36 #ifdef HAVE_ARPA_INET_H
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37 #include <arpa/inet.h>
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38 #endif
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39 #ifdef __VMS
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40 #include <in.h>
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41 #include <inet.h>
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42 #endif
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43
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44 #ifdef HAVE_PROCESS_H
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45 #include <process.h>
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46 #endif
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47
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48 #include "urldata.h"
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49 #include "sendf.h"
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50 #include "hostip.h"
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51 #include "hash.h"
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52 #include "share.h"
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53 #include "strerror.h"
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54 #include "url.h"
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55 #include "inet_pton.h"
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56 /* The last 3 #include files should be in this order */
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57 #include "curl_printf.h"
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58 #include "curl_memory.h"
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59 #include "memdebug.h"
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60
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61 /*
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62 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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63 * been set and returns TRUE if they are OK.
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64 */
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65 bool Curl_ipvalid(struct connectdata *conn)
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66 {
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67 if(conn->ip_version == CURL_IPRESOLVE_V6)
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68 /* An IPv6 address was requested and we can't get/use one */
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69 return FALSE;
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70
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71 return TRUE; /* OK, proceed */
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72 }
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73
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74 #ifdef CURLRES_SYNCH
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75
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76 /*
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77 * Curl_getaddrinfo() - the IPv4 synchronous version.
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78 *
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79 * The original code to this function was from the Dancer source code, written
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80 * by Bjorn Reese, it has since been patched and modified considerably.
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81 *
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82 * gethostbyname_r() is the thread-safe version of the gethostbyname()
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83 * function. When we build for plain IPv4, we attempt to use this
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84 * function. There are _three_ different gethostbyname_r() versions, and we
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85 * detect which one this platform supports in the configure script and set up
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86 * the HAVE_GETHOSTBYNAME_R_3, HAVE_GETHOSTBYNAME_R_5 or
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87 * HAVE_GETHOSTBYNAME_R_6 defines accordingly. Note that HAVE_GETADDRBYNAME
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88 * has the corresponding rules. This is primarily on *nix. Note that some unix
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89 * flavours have thread-safe versions of the plain gethostbyname() etc.
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90 *
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91 */
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92 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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93 const char *hostname,
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94 int port,
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95 int *waitp)
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96 {
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97 Curl_addrinfo *ai = NULL;
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98
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99 #ifdef CURL_DISABLE_VERBOSE_STRINGS
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100 (void)conn;
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101 #endif
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102
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103 *waitp = 0; /* synchronous response only */
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104
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105 ai = Curl_ipv4_resolve_r(hostname, port);
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106 if(!ai)
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107 infof(conn->data, "Curl_ipv4_resolve_r failed for %s\n", hostname);
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108
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109 return ai;
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110 }
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111 #endif /* CURLRES_SYNCH */
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112 #endif /* CURLRES_IPV4 */
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113
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114 #if defined(CURLRES_IPV4) && !defined(CURLRES_ARES)
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115
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116 /*
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117 * Curl_ipv4_resolve_r() - ipv4 threadsafe resolver function.
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118 *
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119 * This is used for both synchronous and asynchronous resolver builds,
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120 * implying that only threadsafe code and function calls may be used.
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121 *
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122 */
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123 Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname,
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124 int port)
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125 {
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126 #if !defined(HAVE_GETADDRINFO_THREADSAFE) && defined(HAVE_GETHOSTBYNAME_R_3)
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127 int res;
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128 #endif
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129 Curl_addrinfo *ai = NULL;
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130 struct hostent *h = NULL;
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131 struct in_addr in;
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132 struct hostent *buf = NULL;
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133
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134 if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
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135 /* This is a dotted IP address 123.123.123.123-style */
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136 return Curl_ip2addr(AF_INET, &in, hostname, port);
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137
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138 #if defined(HAVE_GETADDRINFO_THREADSAFE)
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139 else {
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140 struct addrinfo hints;
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141 char sbuf[12];
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142 char *sbufptr = NULL;
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143
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144 memset(&hints, 0, sizeof(hints));
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145 hints.ai_family = PF_INET;
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146 hints.ai_socktype = SOCK_STREAM;
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147 if(port) {
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148 msnprintf(sbuf, sizeof(sbuf), "%d", port);
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149 sbufptr = sbuf;
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150 }
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151
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152 (void)Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &ai);
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153
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154 #elif defined(HAVE_GETHOSTBYNAME_R)
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155 /*
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156 * gethostbyname_r() is the preferred resolve function for many platforms.
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157 * Since there are three different versions of it, the following code is
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158 * somewhat #ifdef-ridden.
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159 */
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160 else {
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161 int h_errnop;
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162
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163 buf = calloc(1, CURL_HOSTENT_SIZE);
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164 if(!buf)
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165 return NULL; /* major failure */
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166 /*
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167 * The clearing of the buffer is a workaround for a gethostbyname_r bug in
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168 * qnx nto and it is also _required_ for some of these functions on some
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169 * platforms.
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170 */
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171
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172 #if defined(HAVE_GETHOSTBYNAME_R_5)
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173 /* Solaris, IRIX and more */
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174 h = gethostbyname_r(hostname,
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175 (struct hostent *)buf,
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176 (char *)buf + sizeof(struct hostent),
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177 CURL_HOSTENT_SIZE - sizeof(struct hostent),
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178 &h_errnop);
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179
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180 /* If the buffer is too small, it returns NULL and sets errno to
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181 * ERANGE. The errno is thread safe if this is compiled with
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182 * -D_REENTRANT as then the 'errno' variable is a macro defined to get
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183 * used properly for threads.
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184 */
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185
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186 if(h) {
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187 ;
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188 }
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189 else
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190 #elif defined(HAVE_GETHOSTBYNAME_R_6)
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191 /* Linux */
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192
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193 (void)gethostbyname_r(hostname,
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194 (struct hostent *)buf,
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195 (char *)buf + sizeof(struct hostent),
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196 CURL_HOSTENT_SIZE - sizeof(struct hostent),
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diff changeset
197 &h, /* DIFFERENCE */
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diff changeset
198 &h_errnop);
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199 /* Redhat 8, using glibc 2.2.93 changed the behavior. Now all of a
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200 * sudden this function returns EAGAIN if the given buffer size is too
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201 * small. Previous versions are known to return ERANGE for the same
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202 * problem.
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203 *
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204 * This wouldn't be such a big problem if older versions wouldn't
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205 * sometimes return EAGAIN on a common failure case. Alas, we can't
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206 * assume that EAGAIN *or* ERANGE means ERANGE for any given version of
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207 * glibc.
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208 *
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209 * For now, we do that and thus we may call the function repeatedly and
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210 * fail for older glibc versions that return EAGAIN, until we run out of
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211 * buffer size (step_size grows beyond CURL_HOSTENT_SIZE).
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212 *
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213 * If anyone has a better fix, please tell us!
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214 *
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215 * -------------------------------------------------------------------
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216 *
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217 * On October 23rd 2003, Dan C dug up more details on the mysteries of
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218 * gethostbyname_r() in glibc:
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219 *
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220 * In glibc 2.2.5 the interface is different (this has also been
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221 * discovered in glibc 2.1.1-6 as shipped by Redhat 6). What I can't
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222 * explain, is that tests performed on glibc 2.2.4-34 and 2.2.4-32
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223 * (shipped/upgraded by Redhat 7.2) don't show this behavior!
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224 *
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225 * In this "buggy" version, the return code is -1 on error and 'errno'
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226 * is set to the ERANGE or EAGAIN code. Note that 'errno' is not a
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227 * thread-safe variable.
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228 */
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229
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230 if(!h) /* failure */
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231 #elif defined(HAVE_GETHOSTBYNAME_R_3)
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232 /* AIX, Digital Unix/Tru64, HPUX 10, more? */
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233
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234 /* For AIX 4.3 or later, we don't use gethostbyname_r() at all, because of
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235 * the plain fact that it does not return unique full buffers on each
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236 * call, but instead several of the pointers in the hostent structs will
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237 * point to the same actual data! This have the unfortunate down-side that
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238 * our caching system breaks down horribly. Luckily for us though, AIX 4.3
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239 * and more recent versions have a "completely thread-safe"[*] libc where
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240 * all the data is stored in thread-specific memory areas making calls to
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241 * the plain old gethostbyname() work fine even for multi-threaded
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242 * programs.
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243 *
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244 * This AIX 4.3 or later detection is all made in the configure script.
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245 *
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246 * Troels Walsted Hansen helped us work this out on March 3rd, 2003.
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247 *
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248 * [*] = much later we've found out that it isn't at all "completely
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249 * thread-safe", but at least the gethostbyname() function is.
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250 */
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251
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252 if(CURL_HOSTENT_SIZE >=
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253 (sizeof(struct hostent) + sizeof(struct hostent_data))) {
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254
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255 /* August 22nd, 2000: Albert Chin-A-Young brought an updated version
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256 * that should work! September 20: Richard Prescott worked on the buffer
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257 * size dilemma.
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258 */
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259
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260 res = gethostbyname_r(hostname,
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261 (struct hostent *)buf,
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262 (struct hostent_data *)((char *)buf +
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263 sizeof(struct hostent)));
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264 h_errnop = SOCKERRNO; /* we don't deal with this, but set it anyway */
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265 }
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266 else
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267 res = -1; /* failure, too smallish buffer size */
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268
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269 if(!res) { /* success */
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270
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271 h = buf; /* result expected in h */
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272
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273 /* This is the worst kind of the different gethostbyname_r() interfaces.
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274 * Since we don't know how big buffer this particular lookup required,
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275 * we can't realloc down the huge alloc without doing closer analysis of
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276 * the returned data. Thus, we always use CURL_HOSTENT_SIZE for every
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277 * name lookup. Fixing this would require an extra malloc() and then
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278 * calling Curl_addrinfo_copy() that subsequent realloc()s down the new
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279 * memory area to the actually used amount.
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280 */
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281 }
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282 else
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283 #endif /* HAVE_...BYNAME_R_5 || HAVE_...BYNAME_R_6 || HAVE_...BYNAME_R_3 */
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284 {
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285 h = NULL; /* set return code to NULL */
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286 free(buf);
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287 }
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288 #else /* HAVE_GETADDRINFO_THREADSAFE || HAVE_GETHOSTBYNAME_R */
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289 /*
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290 * Here is code for platforms that don't have a thread safe
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291 * getaddrinfo() nor gethostbyname_r() function or for which
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292 * gethostbyname() is the preferred one.
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293 */
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294 else {
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295 h = gethostbyname((void *)hostname);
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296 #endif /* HAVE_GETADDRINFO_THREADSAFE || HAVE_GETHOSTBYNAME_R */
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297 }
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298
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299 if(h) {
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300 ai = Curl_he2ai(h, port);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
301
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
302 if(buf) /* used a *_r() function */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
303 free(buf);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
304 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
305
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
306 return ai;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
307 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
308 #endif /* defined(CURLRES_IPV4) && !defined(CURLRES_ARES) */