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https://github.com/moparisthebest/curl
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5e0a44e4d5
The load host names to DNS cache function was moved to hostip.c and it now makes sure to not add host names that already are present in the cache. It would previously lead to memory leaks when for example using the --resolve and multiple URLs on the command line.
211 lines
6.9 KiB
C
211 lines
6.9 KiB
C
#ifndef HEADER_CURL_HOSTIP_H
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#define HEADER_CURL_HOSTIP_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "setup.h"
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#include "hash.h"
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#include "curl_addrinfo.h"
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#include "asyn.h"
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#ifdef HAVE_SETJMP_H
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#include <setjmp.h>
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#endif
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#ifdef NETWARE
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#undef in_addr_t
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#define in_addr_t unsigned long
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#endif
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/* Allocate enough memory to hold the full name information structs and
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* everything. OSF1 is known to require at least 8872 bytes. The buffer
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* required for storing all possible aliases and IP numbers is according to
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* Stevens' Unix Network Programming 2nd edition, p. 304: 8192 bytes!
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*/
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#define CURL_HOSTENT_SIZE 9000
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#define CURL_TIMEOUT_RESOLVE 300 /* when using asynch methods, we allow this
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many seconds for a name resolve */
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#define CURL_ASYNC_SUCCESS CURLE_OK
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struct addrinfo;
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struct hostent;
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struct SessionHandle;
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struct connectdata;
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/*
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* Curl_global_host_cache_init() initializes and sets up a global DNS cache.
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* Global DNS cache is general badness. Do not use. This will be removed in
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* a future version. Use the share interface instead!
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*
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* Returns a struct curl_hash pointer on success, NULL on failure.
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*/
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struct curl_hash *Curl_global_host_cache_init(void);
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void Curl_global_host_cache_dtor(void);
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struct Curl_dns_entry {
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Curl_addrinfo *addr;
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/* timestamp == 0 -- entry not in hostcache
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timestamp != 0 -- entry is in hostcache */
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time_t timestamp;
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long inuse; /* use-counter, make very sure you decrease this
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when you're done using the address you received */
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};
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/*
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* Curl_resolv() returns an entry with the info for the specified host
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* and port.
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*
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* The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
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* use, or we'll leak memory!
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*/
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/* return codes */
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#define CURLRESOLV_TIMEDOUT -2
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#define CURLRESOLV_ERROR -1
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#define CURLRESOLV_RESOLVED 0
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#define CURLRESOLV_PENDING 1
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int Curl_resolv(struct connectdata *conn, const char *hostname,
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int port, struct Curl_dns_entry **dnsentry);
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int Curl_resolv_timeout(struct connectdata *conn, const char *hostname,
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int port, struct Curl_dns_entry **dnsentry,
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long timeoutms);
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#ifdef CURLRES_IPV6
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/*
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* Curl_ipv6works() returns TRUE if ipv6 seems to work.
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*/
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bool Curl_ipv6works(void);
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#else
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#define Curl_ipv6works() FALSE
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#endif
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/*
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* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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* been set and returns TRUE if they are OK.
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*/
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bool Curl_ipvalid(struct connectdata *conn);
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/*
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* Curl_getaddrinfo() is the generic low-level name resolve API within this
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* source file. There are several versions of this function - for different
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* name resolve layers (selected at build-time). They all take this same set
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* of arguments
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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const char *hostname,
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int port,
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int *waitp);
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/* unlock a previously resolved dns entry */
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void Curl_resolv_unlock(struct SessionHandle *data,
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struct Curl_dns_entry *dns);
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/* for debugging purposes only: */
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void Curl_scan_cache_used(void *user, void *ptr);
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/* make a new dns cache and return the handle */
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struct curl_hash *Curl_mk_dnscache(void);
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/* prune old entries from the DNS cache */
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void Curl_hostcache_prune(struct SessionHandle *data);
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/* Return # of adresses in a Curl_addrinfo struct */
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int Curl_num_addresses (const Curl_addrinfo *addr);
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#if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
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int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
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GETNAMEINFO_TYPE_ARG2 salen,
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char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
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char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
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GETNAMEINFO_TYPE_ARG7 flags,
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int line, const char *source);
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#endif
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/* IPv4 threadsafe resolve function used for synch and asynch builds */
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Curl_addrinfo *Curl_ipv4_resolve_r(const char * hostname, int port);
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CURLcode Curl_async_resolved(struct connectdata *conn,
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bool *protocol_connect);
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#ifndef CURLRES_ASYNCH
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#define Curl_async_resolved(x,y) CURLE_OK
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#endif
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/*
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* Curl_addrinfo_callback() is used when we build with any asynch specialty.
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* Handles end of async request processing. Inserts ai into hostcache when
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* status is CURL_ASYNC_SUCCESS. Twiddles fields in conn to indicate async
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* request completed whether successful or failed.
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*/
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CURLcode Curl_addrinfo_callback(struct connectdata *conn,
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int status,
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Curl_addrinfo *ai);
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/*
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* Curl_printable_address() returns a printable version of the 1st address
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* given in the 'ip' argument. The result will be stored in the buf that is
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* bufsize bytes big.
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*/
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const char *Curl_printable_address(const Curl_addrinfo *ip,
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char *buf, size_t bufsize);
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/*
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* Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
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*
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* Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
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*/
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struct Curl_dns_entry *
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Curl_cache_addr(struct SessionHandle *data, Curl_addrinfo *addr,
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const char *hostname, int port);
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#ifndef INADDR_NONE
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#define CURL_INADDR_NONE (in_addr_t) ~0
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#else
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#define CURL_INADDR_NONE INADDR_NONE
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#endif
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#ifdef HAVE_SIGSETJMP
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/* Forward-declaration of variable defined in hostip.c. Beware this
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* is a global and unique instance. This is used to store the return
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* address that we can jump back to from inside a signal handler.
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* This is not thread-safe stuff.
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*/
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extern sigjmp_buf curl_jmpenv;
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#endif
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/*
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* Function provided by the resolver backend to set DNS servers to use.
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*/
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CURLcode Curl_set_dns_servers(struct SessionHandle *data, char *servers);
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/*
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* Destroy the hostcache of this handle.
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*/
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void Curl_hostcache_destroy(struct SessionHandle *data);
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CURLcode Curl_loadhostpairs(struct SessionHandle *data);
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#endif /* HEADER_CURL_HOSTIP_H */
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