| 1 | #ifndef HEADER_CURL_HOSTIP_H
|
|---|
| 2 | #define HEADER_CURL_HOSTIP_H
|
|---|
| 3 | /***************************************************************************
|
|---|
| 4 | * _ _ ____ _
|
|---|
| 5 | * Project ___| | | | _ \| |
|
|---|
| 6 | * / __| | | | |_) | |
|
|---|
| 7 | * | (__| |_| | _ <| |___
|
|---|
| 8 | * \___|\___/|_| \_\_____|
|
|---|
| 9 | *
|
|---|
| 10 | * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
|
|---|
| 11 | *
|
|---|
| 12 | * This software is licensed as described in the file COPYING, which
|
|---|
| 13 | * you should have received as part of this distribution. The terms
|
|---|
| 14 | * are also available at https://curl.haxx.se/docs/copyright.html.
|
|---|
| 15 | *
|
|---|
| 16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|---|
| 17 | * copies of the Software, and permit persons to whom the Software is
|
|---|
| 18 | * furnished to do so, under the terms of the COPYING file.
|
|---|
| 19 | *
|
|---|
| 20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|---|
| 21 | * KIND, either express or implied.
|
|---|
| 22 | *
|
|---|
| 23 | ***************************************************************************/
|
|---|
| 24 |
|
|---|
| 25 | #include "curl_setup.h"
|
|---|
| 26 | #include "hash.h"
|
|---|
| 27 | #include "curl_addrinfo.h"
|
|---|
| 28 | #include "asyn.h"
|
|---|
| 29 |
|
|---|
| 30 | #ifdef HAVE_SETJMP_H
|
|---|
| 31 | #include <setjmp.h>
|
|---|
| 32 | #endif
|
|---|
| 33 |
|
|---|
| 34 | #ifdef NETWARE
|
|---|
| 35 | #undef in_addr_t
|
|---|
| 36 | #define in_addr_t unsigned long
|
|---|
| 37 | #endif
|
|---|
| 38 |
|
|---|
| 39 | /* Allocate enough memory to hold the full name information structs and
|
|---|
| 40 | * everything. OSF1 is known to require at least 8872 bytes. The buffer
|
|---|
| 41 | * required for storing all possible aliases and IP numbers is according to
|
|---|
| 42 | * Stevens' Unix Network Programming 2nd edition, p. 304: 8192 bytes!
|
|---|
| 43 | */
|
|---|
| 44 | #define CURL_HOSTENT_SIZE 9000
|
|---|
| 45 |
|
|---|
| 46 | #define CURL_TIMEOUT_RESOLVE 300 /* when using asynch methods, we allow this
|
|---|
| 47 | many seconds for a name resolve */
|
|---|
| 48 |
|
|---|
| 49 | #define CURL_ASYNC_SUCCESS CURLE_OK
|
|---|
| 50 |
|
|---|
| 51 | struct addrinfo;
|
|---|
| 52 | struct hostent;
|
|---|
| 53 | struct Curl_easy;
|
|---|
| 54 | struct connectdata;
|
|---|
| 55 |
|
|---|
| 56 | /*
|
|---|
| 57 | * Curl_global_host_cache_init() initializes and sets up a global DNS cache.
|
|---|
| 58 | * Global DNS cache is general badness. Do not use. This will be removed in
|
|---|
| 59 | * a future version. Use the share interface instead!
|
|---|
| 60 | *
|
|---|
| 61 | * Returns a struct curl_hash pointer on success, NULL on failure.
|
|---|
| 62 | */
|
|---|
| 63 | struct curl_hash *Curl_global_host_cache_init(void);
|
|---|
| 64 | void Curl_global_host_cache_dtor(void);
|
|---|
| 65 |
|
|---|
| 66 | struct Curl_dns_entry {
|
|---|
| 67 | Curl_addrinfo *addr;
|
|---|
| 68 | /* timestamp == 0 -- CURLOPT_RESOLVE entry, doesn't timeout */
|
|---|
| 69 | time_t timestamp;
|
|---|
| 70 | /* use-counter, use Curl_resolv_unlock to release reference */
|
|---|
| 71 | long inuse;
|
|---|
| 72 | };
|
|---|
| 73 |
|
|---|
| 74 | /*
|
|---|
| 75 | * Curl_resolv() returns an entry with the info for the specified host
|
|---|
| 76 | * and port.
|
|---|
| 77 | *
|
|---|
| 78 | * The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
|
|---|
| 79 | * use, or we'll leak memory!
|
|---|
| 80 | */
|
|---|
| 81 | /* return codes */
|
|---|
| 82 | #define CURLRESOLV_TIMEDOUT -2
|
|---|
| 83 | #define CURLRESOLV_ERROR -1
|
|---|
| 84 | #define CURLRESOLV_RESOLVED 0
|
|---|
| 85 | #define CURLRESOLV_PENDING 1
|
|---|
| 86 | int Curl_resolv(struct connectdata *conn, const char *hostname,
|
|---|
| 87 | int port, struct Curl_dns_entry **dnsentry);
|
|---|
| 88 | int Curl_resolv_timeout(struct connectdata *conn, const char *hostname,
|
|---|
| 89 | int port, struct Curl_dns_entry **dnsentry,
|
|---|
| 90 | time_t timeoutms);
|
|---|
| 91 |
|
|---|
| 92 | #ifdef CURLRES_IPV6
|
|---|
| 93 | /*
|
|---|
| 94 | * Curl_ipv6works() returns TRUE if IPv6 seems to work.
|
|---|
| 95 | */
|
|---|
| 96 | bool Curl_ipv6works(void);
|
|---|
| 97 | #else
|
|---|
| 98 | #define Curl_ipv6works() FALSE
|
|---|
| 99 | #endif
|
|---|
| 100 |
|
|---|
| 101 | /*
|
|---|
| 102 | * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
|
|---|
| 103 | * been set and returns TRUE if they are OK.
|
|---|
| 104 | */
|
|---|
| 105 | bool Curl_ipvalid(struct connectdata *conn);
|
|---|
| 106 |
|
|---|
| 107 |
|
|---|
| 108 | /*
|
|---|
| 109 | * Curl_getaddrinfo() is the generic low-level name resolve API within this
|
|---|
| 110 | * source file. There are several versions of this function - for different
|
|---|
| 111 | * name resolve layers (selected at build-time). They all take this same set
|
|---|
| 112 | * of arguments
|
|---|
| 113 | */
|
|---|
| 114 | Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
|
|---|
| 115 | const char *hostname,
|
|---|
| 116 | int port,
|
|---|
| 117 | int *waitp);
|
|---|
| 118 |
|
|---|
| 119 |
|
|---|
| 120 | /* unlock a previously resolved dns entry */
|
|---|
| 121 | void Curl_resolv_unlock(struct Curl_easy *data,
|
|---|
| 122 | struct Curl_dns_entry *dns);
|
|---|
| 123 |
|
|---|
| 124 | /* for debugging purposes only: */
|
|---|
| 125 | void Curl_scan_cache_used(void *user, void *ptr);
|
|---|
| 126 |
|
|---|
| 127 | /* init a new dns cache and return success */
|
|---|
| 128 | int Curl_mk_dnscache(struct curl_hash *hash);
|
|---|
| 129 |
|
|---|
| 130 | /* prune old entries from the DNS cache */
|
|---|
| 131 | void Curl_hostcache_prune(struct Curl_easy *data);
|
|---|
| 132 |
|
|---|
| 133 | /* Return # of addresses in a Curl_addrinfo struct */
|
|---|
| 134 | int Curl_num_addresses(const Curl_addrinfo *addr);
|
|---|
| 135 |
|
|---|
| 136 | #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
|
|---|
| 137 | int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
|
|---|
| 138 | GETNAMEINFO_TYPE_ARG2 salen,
|
|---|
| 139 | char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
|
|---|
| 140 | char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
|
|---|
| 141 | GETNAMEINFO_TYPE_ARG7 flags,
|
|---|
| 142 | int line, const char *source);
|
|---|
| 143 | #endif
|
|---|
| 144 |
|
|---|
| 145 | /* IPv4 threadsafe resolve function used for synch and asynch builds */
|
|---|
| 146 | Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname, int port);
|
|---|
| 147 |
|
|---|
| 148 | CURLcode Curl_once_resolved(struct connectdata *conn, bool *protocol_connect);
|
|---|
| 149 |
|
|---|
| 150 | /*
|
|---|
| 151 | * Curl_addrinfo_callback() is used when we build with any asynch specialty.
|
|---|
| 152 | * Handles end of async request processing. Inserts ai into hostcache when
|
|---|
| 153 | * status is CURL_ASYNC_SUCCESS. Twiddles fields in conn to indicate async
|
|---|
| 154 | * request completed whether successful or failed.
|
|---|
| 155 | */
|
|---|
| 156 | CURLcode Curl_addrinfo_callback(struct connectdata *conn,
|
|---|
| 157 | int status,
|
|---|
| 158 | Curl_addrinfo *ai);
|
|---|
| 159 |
|
|---|
| 160 | /*
|
|---|
| 161 | * Curl_printable_address() returns a printable version of the 1st address
|
|---|
| 162 | * given in the 'ip' argument. The result will be stored in the buf that is
|
|---|
| 163 | * bufsize bytes big.
|
|---|
| 164 | */
|
|---|
| 165 | const char *Curl_printable_address(const Curl_addrinfo *ip,
|
|---|
| 166 | char *buf, size_t bufsize);
|
|---|
| 167 |
|
|---|
| 168 | /*
|
|---|
| 169 | * Curl_fetch_addr() fetches a 'Curl_dns_entry' already in the DNS cache.
|
|---|
| 170 | *
|
|---|
| 171 | * Returns the Curl_dns_entry entry pointer or NULL if not in the cache.
|
|---|
| 172 | *
|
|---|
| 173 | * The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
|
|---|
| 174 | * use, or we'll leak memory!
|
|---|
| 175 | */
|
|---|
| 176 | struct Curl_dns_entry *
|
|---|
| 177 | Curl_fetch_addr(struct connectdata *conn,
|
|---|
| 178 | const char *hostname,
|
|---|
| 179 | int port);
|
|---|
| 180 |
|
|---|
| 181 | /*
|
|---|
| 182 | * Curl_shuffle_addr() shuffles the order of addresses in a 'Curl_addrinfo'
|
|---|
| 183 | * struct by re-linking its linked list.
|
|---|
| 184 | *
|
|---|
| 185 | * The addr argument should be the address of a pointer to the head node of a
|
|---|
| 186 | * `Curl_addrinfo` list and it will be modified to point to the new head after
|
|---|
| 187 | * shuffling.
|
|---|
| 188 | */
|
|---|
| 189 | CURLcode Curl_shuffle_addr(struct Curl_easy *data, Curl_addrinfo **addr);
|
|---|
| 190 |
|
|---|
| 191 | /*
|
|---|
| 192 | * Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
|
|---|
| 193 | *
|
|---|
| 194 | * Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
|
|---|
| 195 | */
|
|---|
| 196 | struct Curl_dns_entry *
|
|---|
| 197 | Curl_cache_addr(struct Curl_easy *data, Curl_addrinfo *addr,
|
|---|
| 198 | const char *hostname, int port);
|
|---|
| 199 |
|
|---|
| 200 | #ifndef INADDR_NONE
|
|---|
| 201 | #define CURL_INADDR_NONE (in_addr_t) ~0
|
|---|
| 202 | #else
|
|---|
| 203 | #define CURL_INADDR_NONE INADDR_NONE
|
|---|
| 204 | #endif
|
|---|
| 205 |
|
|---|
| 206 | #ifdef HAVE_SIGSETJMP
|
|---|
| 207 | /* Forward-declaration of variable defined in hostip.c. Beware this
|
|---|
| 208 | * is a global and unique instance. This is used to store the return
|
|---|
| 209 | * address that we can jump back to from inside a signal handler.
|
|---|
| 210 | * This is not thread-safe stuff.
|
|---|
| 211 | */
|
|---|
| 212 | extern sigjmp_buf curl_jmpenv;
|
|---|
| 213 | #endif
|
|---|
| 214 |
|
|---|
| 215 | /*
|
|---|
| 216 | * Function provided by the resolver backend to set DNS servers to use.
|
|---|
| 217 | */
|
|---|
| 218 | CURLcode Curl_set_dns_servers(struct Curl_easy *data, char *servers);
|
|---|
| 219 |
|
|---|
| 220 | /*
|
|---|
| 221 | * Function provided by the resolver backend to set
|
|---|
| 222 | * outgoing interface to use for DNS requests
|
|---|
| 223 | */
|
|---|
| 224 | CURLcode Curl_set_dns_interface(struct Curl_easy *data,
|
|---|
| 225 | const char *interf);
|
|---|
| 226 |
|
|---|
| 227 | /*
|
|---|
| 228 | * Function provided by the resolver backend to set
|
|---|
| 229 | * local IPv4 address to use as source address for DNS requests
|
|---|
| 230 | */
|
|---|
| 231 | CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
|
|---|
| 232 | const char *local_ip4);
|
|---|
| 233 |
|
|---|
| 234 | /*
|
|---|
| 235 | * Function provided by the resolver backend to set
|
|---|
| 236 | * local IPv6 address to use as source address for DNS requests
|
|---|
| 237 | */
|
|---|
| 238 | CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
|
|---|
| 239 | const char *local_ip6);
|
|---|
| 240 |
|
|---|
| 241 | /*
|
|---|
| 242 | * Clean off entries from the cache
|
|---|
| 243 | */
|
|---|
| 244 | void Curl_hostcache_clean(struct Curl_easy *data, struct curl_hash *hash);
|
|---|
| 245 |
|
|---|
| 246 | /*
|
|---|
| 247 | * Destroy the hostcache of this handle.
|
|---|
| 248 | */
|
|---|
| 249 | void Curl_hostcache_destroy(struct Curl_easy *data);
|
|---|
| 250 |
|
|---|
| 251 | /*
|
|---|
| 252 | * Populate the cache with specified entries from CURLOPT_RESOLVE.
|
|---|
| 253 | */
|
|---|
| 254 | CURLcode Curl_loadhostpairs(struct Curl_easy *data);
|
|---|
| 255 |
|
|---|
| 256 | CURLcode Curl_resolv_check(struct connectdata *conn,
|
|---|
| 257 | struct Curl_dns_entry **dns);
|
|---|
| 258 | int Curl_resolv_getsock(struct connectdata *conn,
|
|---|
| 259 | curl_socket_t *socks,
|
|---|
| 260 | int numsocks);
|
|---|
| 261 |
|
|---|
| 262 | #endif /* HEADER_CURL_HOSTIP_H */
|
|---|
