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 - 2017, 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 IPv6-enabled builds
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27 | **********************************************************************/
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28 | #ifdef CURLRES_IPV6
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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 | #include "connect.h"
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57 | /* The last 3 #include files should be in this order */
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58 | #include "curl_printf.h"
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59 | #include "curl_memory.h"
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60 | #include "memdebug.h"
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61 |
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62 | #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
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63 | /* These are strictly for memory tracing and are using the same style as the
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64 | * family otherwise present in memdebug.c. I put these ones here since they
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65 | * require a bunch of structs I didn't want to include in memdebug.c
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66 | */
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67 |
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68 | /*
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69 | * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
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70 | * (ignoring the fact c-ares doesn't return 'serv').
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71 | */
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72 |
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73 | int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
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74 | GETNAMEINFO_TYPE_ARG2 salen,
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75 | char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
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76 | char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
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77 | GETNAMEINFO_TYPE_ARG7 flags,
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78 | int line, const char *source)
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79 | {
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80 | int res = (getnameinfo)(sa, salen,
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81 | host, hostlen,
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82 | serv, servlen,
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83 | flags);
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84 | if(0 == res)
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85 | /* success */
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86 | curl_memlog("GETNAME %s:%d getnameinfo()\n",
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87 | source, line);
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88 | else
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89 | curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
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90 | source, line, res);
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91 | return res;
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92 | }
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93 | #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
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94 |
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95 | /*
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96 | * Curl_ipv6works() returns TRUE if IPv6 seems to work.
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97 | */
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98 | bool Curl_ipv6works(void)
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99 | {
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100 | /* the nature of most system is that IPv6 status doesn't come and go
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101 | during a program's lifetime so we only probe the first time and then we
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102 | have the info kept for fast re-use */
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103 | static int ipv6_works = -1;
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104 | if(-1 == ipv6_works) {
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105 | /* probe to see if we have a working IPv6 stack */
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106 | curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
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107 | if(s == CURL_SOCKET_BAD)
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108 | /* an IPv6 address was requested but we can't get/use one */
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109 | ipv6_works = 0;
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110 | else {
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111 | ipv6_works = 1;
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112 | Curl_closesocket(NULL, s);
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113 | }
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114 | }
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115 | return (ipv6_works>0)?TRUE:FALSE;
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116 | }
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117 |
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118 | /*
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119 | * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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120 | * been set and returns TRUE if they are OK.
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121 | */
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122 | bool Curl_ipvalid(struct connectdata *conn)
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123 | {
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124 | if(conn->ip_version == CURL_IPRESOLVE_V6)
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125 | return Curl_ipv6works();
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126 |
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127 | return TRUE;
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128 | }
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129 |
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130 | #if defined(CURLRES_SYNCH)
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131 |
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132 | #ifdef DEBUG_ADDRINFO
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133 | static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
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134 | {
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135 | printf("dump_addrinfo:\n");
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136 | for(; ai; ai = ai->ai_next) {
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137 | char buf[INET6_ADDRSTRLEN];
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138 |
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139 | printf(" fam %2d, CNAME %s, ",
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140 | ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
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141 | if(Curl_printable_address(ai, buf, sizeof(buf)))
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142 | printf("%s\n", buf);
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143 | else
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144 | printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
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145 | }
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146 | }
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147 | #else
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148 | #define dump_addrinfo(x,y) Curl_nop_stmt
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149 | #endif
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150 |
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151 | /*
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152 | * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
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153 | * non-ares version).
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154 | *
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155 | * Returns name information about the given hostname and port number. If
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156 | * successful, the 'addrinfo' is returned and the forth argument will point to
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157 | * memory we need to free after use. That memory *MUST* be freed with
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158 | * Curl_freeaddrinfo(), nothing else.
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159 | */
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160 | Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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161 | const char *hostname,
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162 | int port,
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163 | int *waitp)
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164 | {
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165 | struct addrinfo hints;
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166 | Curl_addrinfo *res;
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167 | int error;
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168 | char sbuf[12];
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169 | char *sbufptr = NULL;
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170 | #ifndef USE_RESOLVE_ON_IPS
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171 | char addrbuf[128];
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172 | #endif
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173 | int pf;
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174 | #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
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175 | struct Curl_easy *data = conn->data;
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176 | #endif
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177 |
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178 | *waitp = 0; /* synchronous response only */
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179 |
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180 | /* Check if a limited name resolve has been requested */
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181 | switch(conn->ip_version) {
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182 | case CURL_IPRESOLVE_V4:
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183 | pf = PF_INET;
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184 | break;
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185 | case CURL_IPRESOLVE_V6:
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186 | pf = PF_INET6;
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187 | break;
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188 | default:
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189 | pf = PF_UNSPEC;
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190 | break;
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191 | }
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192 |
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193 | if((pf != PF_INET) && !Curl_ipv6works())
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194 | /* The stack seems to be a non-IPv6 one */
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195 | pf = PF_INET;
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196 |
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197 | memset(&hints, 0, sizeof(hints));
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198 | hints.ai_family = pf;
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199 | hints.ai_socktype = conn->socktype;
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200 |
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201 | #ifndef USE_RESOLVE_ON_IPS
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202 | /*
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203 | * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
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204 | * an IPv4 address on iOS and Mac OS X.
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205 | */
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206 | if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
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207 | (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
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208 | /* the given address is numerical only, prevent a reverse lookup */
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209 | hints.ai_flags = AI_NUMERICHOST;
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210 | }
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211 | #endif
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212 |
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213 | if(port) {
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214 | snprintf(sbuf, sizeof(sbuf), "%d", port);
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215 | sbufptr = sbuf;
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216 | }
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217 |
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218 | error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
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219 | if(error) {
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220 | infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
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221 | return NULL;
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222 | }
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223 |
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224 | if(port) {
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225 | Curl_addrinfo_set_port(res, port);
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226 | }
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227 |
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228 | dump_addrinfo(conn, res);
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229 |
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230 | return res;
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231 | }
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232 | #endif /* CURLRES_SYNCH */
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233 |
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234 | #endif /* CURLRES_IPV6 */
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