| 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 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 | snprintf(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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| 197 | &h, /* DIFFERENCE */
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| 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);
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| 301 |
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| 302 | if(buf) /* used a *_r() function */
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| 303 | free(buf);
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| 304 | }
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| 305 |
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| 306 | return ai;
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| 307 | }
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| 308 | #endif /* defined(CURLRES_IPV4) && !defined(CURLRES_ARES) */
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