mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 16:18:48 -05:00
6fdbb01194
(http://curl.haxx.se/bug/view.cgi?id=1431750) helped me identify and fix two different but related bugs: 1) Removing an easy handle from a multi handle before the transfer is done could leave a connection in the connection cache for that handle that is in a state that isn't suitable for re-use. A subsequent re-use could then read from a NULL pointer and segfault. 2) When an easy handle was removed from the multi handle, there could be an outstanding c-ares DNS name resolve request. When the response arrived, it caused havoc since the connection struct it "belonged" to could've been freed already. Now Curl_done() is called when an easy handle is removed from a multi handle pre-maturely (that is, before the transfer was complteted). Curl_done() also makes sure to cancel all (if any) outstanding c-ares requests.
261 lines
8.2 KiB
C
261 lines
8.2 KiB
C
#ifndef __HOSTIP_H
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#define __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 - 2006, 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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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include "hash.h"
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/*
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* Setup comfortable CURLRES_* defines to use in the host*.c sources.
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*/
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#ifdef USE_ARES
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#define CURLRES_ASYNCH
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#define CURLRES_ARES
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#endif
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#ifdef USE_THREADING_GETHOSTBYNAME
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#define CURLRES_ASYNCH
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#define CURLRES_THREADED
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#endif
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#ifdef USE_THREADING_GETADDRINFO
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#define CURLRES_ASYNCH
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#define CURLRES_THREADED
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#endif
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#ifdef ENABLE_IPV6
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#define CURLRES_IPV6
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#else
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#define CURLRES_IPV4
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#endif
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#ifdef CURLRES_IPV4
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#if !defined(HAVE_GETHOSTBYNAME_R) || defined(CURLRES_ASYNCH)
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/* If built for ipv4 and missing gethostbyname_r(), or if using async name
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resolve, we need the Curl_addrinfo_copy() function (which itself needs the
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Curl_hostent_relocate() function)) */
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#define CURLRES_ADDRINFO_COPY
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#endif
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#endif /* IPv4-only */
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#ifndef CURLRES_ASYNCH
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#define CURLRES_SYNCH
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#endif
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#ifndef USE_LIBIDN
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#define CURLRES_IDN
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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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#ifdef CURLRES_ARES
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#define CURL_ASYNC_SUCCESS ARES_SUCCESS
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#else
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#define CURL_ASYNC_SUCCESS CURLE_OK
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#define ares_cancel(x)
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#endif
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/*
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* Curl_addrinfo MUST be used for all name resolved info.
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*/
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#ifdef CURLRES_IPV6
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typedef struct addrinfo Curl_addrinfo;
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#else
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/* OK, so some ipv4-only include tree probably have the addrinfo struct, but
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to work even on those that don't, we provide our own look-alike! */
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struct Curl_addrinfo {
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int ai_flags;
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int ai_family;
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int ai_socktype;
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int ai_protocol;
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size_t ai_addrlen;
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struct sockaddr *ai_addr;
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char *ai_canonname;
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struct Curl_addrinfo *ai_next;
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};
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typedef struct Curl_addrinfo Curl_addrinfo;
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#endif
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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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void Curl_global_host_cache_init(void);
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void Curl_global_host_cache_dtor(void);
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struct curl_hash *Curl_global_host_cache_get(void);
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#define Curl_global_host_cache_use(__p) ((__p)->set.global_dns_cache)
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struct Curl_dns_entry {
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Curl_addrinfo *addr;
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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_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, char *hostname,
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int port, struct Curl_dns_entry **dnsentry);
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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 SessionHandle *data);
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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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char *hostname,
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int port,
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int *waitp);
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CURLcode Curl_is_resolved(struct connectdata *conn,
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struct Curl_dns_entry **dns);
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CURLcode Curl_wait_for_resolv(struct connectdata *conn,
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struct Curl_dns_entry **dnsentry);
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/* Curl_resolv_fdset() is a generic function that exists in multiple versions
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depending on what name resolve technology we've built to use. The function
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is called from the curl_multi_fdset() function */
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CURLcode Curl_resolv_fdset(struct connectdata *conn,
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fd_set *read_fd_set,
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fd_set *write_fd_set,
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int *max_fdp);
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/* unlock a previously resolved dns entry */
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void Curl_resolv_unlock(struct SessionHandle *data, 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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/* free name info */
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void Curl_freeaddrinfo(Curl_addrinfo *freeaddr);
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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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#ifdef CURLDEBUG
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void curl_dofreeaddrinfo(struct addrinfo *freethis,
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int line, const char *source);
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int curl_dogetaddrinfo(char *hostname, char *service,
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struct addrinfo *hints,
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struct addrinfo **result,
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int line, const char *source);
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int curl_dogetnameinfo(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen,
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char *serv, size_t servlen, int flags,
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int line, const char *source);
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#endif
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/* This is the callback function that is used when we build with asynch
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resolve, ipv4 */
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CURLcode Curl_addrinfo4_callback(void *arg,
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int status,
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struct hostent *hostent);
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/* This is the callback function that is used when we build with asynch
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resolve, ipv6 */
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CURLcode Curl_addrinfo6_callback(void *arg,
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int status,
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struct addrinfo *ai);
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/* [ipv4 only] Creates a Curl_addrinfo struct from a numerical-only IP
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address */
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Curl_addrinfo *Curl_ip2addr(in_addr_t num, char *hostname, int port);
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/* [ipv4 only] Curl_he2ai() converts a struct hostent to a Curl_addrinfo chain
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and returns it */
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Curl_addrinfo *Curl_he2ai(struct hostent *, int port);
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/* relocate a hostent struct */
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void Curl_hostent_relocate(struct hostent *h, long offset);
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/* Clone a Curl_addrinfo struct, works protocol independently */
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Curl_addrinfo *Curl_addrinfo_copy(void *orig, int port);
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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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char *hostname, int port);
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/*
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* Curl_destroy_thread_data() cleans up async resolver data.
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* Complementary of ares_destroy.
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*/
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struct Curl_async; /* forward-declaration */
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void Curl_destroy_thread_data(struct Curl_async *async);
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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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#endif
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