summaryrefslogtreecommitdiff
path: root/libcurl/src/lib/hostip.c
diff options
context:
space:
mode:
Diffstat (limited to 'libcurl/src/lib/hostip.c')
-rw-r--r--libcurl/src/lib/hostip.c879
1 files changed, 0 insertions, 879 deletions
diff --git a/libcurl/src/lib/hostip.c b/libcurl/src/lib/hostip.c
deleted file mode 100644
index b58eedd..0000000
--- a/libcurl/src/lib/hostip.c
+++ /dev/null
@@ -1,879 +0,0 @@
-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at http://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-#include "curl_setup.h"
-
-#ifdef HAVE_NETINET_IN_H
-#include <netinet/in.h>
-#endif
-#ifdef HAVE_NETDB_H
-#include <netdb.h>
-#endif
-#ifdef HAVE_ARPA_INET_H
-#include <arpa/inet.h>
-#endif
-#ifdef __VMS
-#include <in.h>
-#include <inet.h>
-#endif
-
-#ifdef HAVE_SETJMP_H
-#include <setjmp.h>
-#endif
-#ifdef HAVE_SIGNAL_H
-#include <signal.h>
-#endif
-
-#ifdef HAVE_PROCESS_H
-#include <process.h>
-#endif
-
-#include "urldata.h"
-#include "sendf.h"
-#include "hostip.h"
-#include "hash.h"
-#include "share.h"
-#include "strerror.h"
-#include "url.h"
-#include "inet_ntop.h"
-#include "warnless.h"
-#include "curl_printf.h"
-#include "curl_memory.h"
-/* The last #include file should be: */
-#include "memdebug.h"
-
-#if defined(CURLRES_SYNCH) && \
- defined(HAVE_ALARM) && defined(SIGALRM) && defined(HAVE_SIGSETJMP)
-/* alarm-based timeouts can only be used with all the dependencies satisfied */
-#define USE_ALARM_TIMEOUT
-#endif
-
-/*
- * hostip.c explained
- * ==================
- *
- * The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c
- * source file are these:
- *
- * CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use
- * that. The host may not be able to resolve IPv6, but we don't really have to
- * take that into account. Hosts that aren't IPv6-enabled have CURLRES_IPV4
- * defined.
- *
- * CURLRES_ARES - is defined if libcurl is built to use c-ares for
- * asynchronous name resolves. This can be Windows or *nix.
- *
- * CURLRES_THREADED - is defined if libcurl is built to run under (native)
- * Windows, and then the name resolve will be done in a new thread, and the
- * supported API will be the same as for ares-builds.
- *
- * If any of the two previous are defined, CURLRES_ASYNCH is defined too. If
- * libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is
- * defined.
- *
- * The host*.c sources files are split up like this:
- *
- * hostip.c - method-independent resolver functions and utility functions
- * hostasyn.c - functions for asynchronous name resolves
- * hostsyn.c - functions for synchronous name resolves
- * hostip4.c - IPv4 specific functions
- * hostip6.c - IPv6 specific functions
- *
- * The two asynchronous name resolver backends are implemented in:
- * asyn-ares.c - functions for ares-using name resolves
- * asyn-thread.c - functions for threaded name resolves
-
- * The hostip.h is the united header file for all this. It defines the
- * CURLRES_* defines based on the config*.h and curl_setup.h defines.
- */
-
-/* These two symbols are for the global DNS cache */
-static struct curl_hash hostname_cache;
-static int host_cache_initialized;
-
-static void freednsentry(void *freethis);
-
-/*
- * Curl_global_host_cache_init() initializes and sets up a global DNS cache.
- * Global DNS cache is general badness. Do not use. This will be removed in
- * a future version. Use the share interface instead!
- *
- * Returns a struct curl_hash pointer on success, NULL on failure.
- */
-CURL_STATIC struct curl_hash *Curl_global_host_cache_init(void)
-{
- int rc = 0;
- if(!host_cache_initialized) {
- rc = Curl_hash_init(&hostname_cache, 7, Curl_hash_str,
- Curl_str_key_compare, freednsentry);
- if(!rc)
- host_cache_initialized = 1;
- }
- return rc?NULL:&hostname_cache;
-}
-
-/*
- * Destroy and cleanup the global DNS cache
- */
-CURL_STATIC void Curl_global_host_cache_dtor(void)
-{
- if(host_cache_initialized) {
- Curl_hash_clean(&hostname_cache);
- host_cache_initialized = 0;
- }
-}
-
-/*
- * Return # of adresses in a Curl_addrinfo struct
- */
-CURL_STATIC int Curl_num_addresses(const Curl_addrinfo *addr)
-{
- int i = 0;
- while(addr) {
- addr = addr->ai_next;
- i++;
- }
- return i;
-}
-
-/*
- * Curl_printable_address() returns a printable version of the 1st address
- * given in the 'ai' argument. The result will be stored in the buf that is
- * bufsize bytes big.
- *
- * If the conversion fails, it returns NULL.
- */
-CURL_STATIC const char *
-Curl_printable_address(const Curl_addrinfo *ai, char *buf, size_t bufsize)
-{
- const struct sockaddr_in *sa4;
- const struct in_addr *ipaddr4;
-#ifdef ENABLE_IPV6
- const struct sockaddr_in6 *sa6;
- const struct in6_addr *ipaddr6;
-#endif
-
- switch (ai->ai_family) {
- case AF_INET:
- sa4 = (const void *)ai->ai_addr;
- ipaddr4 = &sa4->sin_addr;
- return Curl_inet_ntop(ai->ai_family, (const void *)ipaddr4, buf,
- bufsize);
-#ifdef ENABLE_IPV6
- case AF_INET6:
- sa6 = (const void *)ai->ai_addr;
- ipaddr6 = &sa6->sin6_addr;
- return Curl_inet_ntop(ai->ai_family, (const void *)ipaddr6, buf,
- bufsize);
-#endif
- default:
- break;
- }
- return NULL;
-}
-
-/*
- * Return a hostcache id string for the provided host + port, to be used by
- * the DNS caching.
- */
-static char *
-create_hostcache_id(const char *name, int port)
-{
- /* create and return the new allocated entry */
- char *id = aprintf("%s:%d", name, port);
- char *ptr = id;
- if(ptr) {
- /* lower case the name part */
- while(*ptr && (*ptr != ':')) {
- *ptr = (char)TOLOWER(*ptr);
- ptr++;
- }
- }
- return id;
-}
-
-struct hostcache_prune_data {
- long cache_timeout;
- time_t now;
-};
-
-/*
- * This function is set as a callback to be called for every entry in the DNS
- * cache when we want to prune old unused entries.
- *
- * Returning non-zero means remove the entry, return 0 to keep it in the
- * cache.
- */
-static int
-hostcache_timestamp_remove(void *datap, void *hc)
-{
- struct hostcache_prune_data *data =
- (struct hostcache_prune_data *) datap;
- struct Curl_dns_entry *c = (struct Curl_dns_entry *) hc;
-
- return (0 != c->timestamp)
- && (data->now - c->timestamp >= data->cache_timeout);
-}
-
-/*
- * Prune the DNS cache. This assumes that a lock has already been taken.
- */
-static void
-hostcache_prune(struct curl_hash *hostcache, long cache_timeout, time_t now)
-{
- struct hostcache_prune_data user;
-
- user.cache_timeout = cache_timeout;
- user.now = now;
-
- Curl_hash_clean_with_criterium(hostcache,
- (void *) &user,
- hostcache_timestamp_remove);
-}
-
-/*
- * Library-wide function for pruning the DNS cache. This function takes and
- * returns the appropriate locks.
- */
-CURL_STATIC void Curl_hostcache_prune(struct SessionHandle *data)
-{
- time_t now;
-
- if((data->set.dns_cache_timeout == -1) || !data->dns.hostcache)
- /* cache forever means never prune, and NULL hostcache means
- we can't do it */
- return;
-
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- time(&now);
-
- /* Remove outdated and unused entries from the hostcache */
- hostcache_prune(data->dns.hostcache,
- data->set.dns_cache_timeout,
- now);
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-}
-
-#ifdef HAVE_SIGSETJMP
-/* Beware this is a global and unique instance. This is used to store the
- return address that we can jump back to from inside a signal handler. This
- is not thread-safe stuff. */
-sigjmp_buf curl_jmpenv;
-#endif
-
-/* lookup address, returns entry if found and not stale */
-static struct Curl_dns_entry *
-fetch_addr(struct connectdata *conn,
- const char *hostname,
- int port)
-{
- char *entry_id = NULL;
- struct Curl_dns_entry *dns = NULL;
- size_t entry_len;
- struct SessionHandle *data = conn->data;
-
- /* Create an entry id, based upon the hostname and port */
- entry_id = create_hostcache_id(hostname, port);
- /* If we can't create the entry id, fail */
- if(!entry_id)
- return dns;
-
- entry_len = strlen(entry_id);
-
- /* See if its already in our dns cache */
- dns = Curl_hash_pick(data->dns.hostcache, entry_id, entry_len+1);
-
- if(dns && (data->set.dns_cache_timeout != -1)) {
- /* See whether the returned entry is stale. Done before we release lock */
- struct hostcache_prune_data user;
-
- time(&user.now);
- user.cache_timeout = data->set.dns_cache_timeout;
-
- if(hostcache_timestamp_remove(&user, dns)) {
- infof(data, "Hostname in DNS cache was stale, zapped\n");
- dns = NULL; /* the memory deallocation is being handled by the hash */
- Curl_hash_delete(data->dns.hostcache, entry_id, entry_len+1);
- }
- }
-
- /* free the allocated entry_id again */
- free(entry_id);
-
- return dns;
-}
-
-/*
- * Curl_fetch_addr() fetches a 'Curl_dns_entry' already in the DNS cache.
- *
- * Curl_resolv() checks initially and multi_runsingle() checks each time
- * it discovers the handle in the state WAITRESOLVE whether the hostname
- * has already been resolved and the address has already been stored in
- * the DNS cache. This short circuits waiting for a lot of pending
- * lookups for the same hostname requested by different handles.
- *
- * Returns the Curl_dns_entry entry pointer or NULL if not in the cache.
- *
- * The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
- * use, or we'll leak memory!
- */
-CURL_STATIC struct Curl_dns_entry *
-Curl_fetch_addr(struct connectdata *conn,
- const char *hostname,
- int port)
-{
- struct SessionHandle *data = conn->data;
- struct Curl_dns_entry *dns = NULL;
-
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- dns = fetch_addr(conn, hostname, port);
-
- if(dns) dns->inuse++; /* we use it! */
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-
- return dns;
-}
-
-/*
- * Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
- *
- * When calling Curl_resolv() has resulted in a response with a returned
- * address, we call this function to store the information in the dns
- * cache etc
- *
- * Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
- */
-CURL_STATIC struct Curl_dns_entry *
-Curl_cache_addr(struct SessionHandle *data,
- Curl_addrinfo *addr,
- const char *hostname,
- int port)
-{
- char *entry_id;
- size_t entry_len;
- struct Curl_dns_entry *dns;
- struct Curl_dns_entry *dns2;
-
- /* Create an entry id, based upon the hostname and port */
- entry_id = create_hostcache_id(hostname, port);
- /* If we can't create the entry id, fail */
- if(!entry_id)
- return NULL;
- entry_len = strlen(entry_id);
-
- /* Create a new cache entry */
- dns = calloc(1, sizeof(struct Curl_dns_entry));
- if(!dns) {
- free(entry_id);
- return NULL;
- }
-
- dns->inuse = 1; /* the cache has the first reference */
- dns->addr = addr; /* this is the address(es) */
- time(&dns->timestamp);
- if(dns->timestamp == 0)
- dns->timestamp = 1; /* zero indicates CURLOPT_RESOLVE entry */
-
- /* Store the resolved data in our DNS cache. */
- dns2 = Curl_hash_add(data->dns.hostcache, entry_id, entry_len+1,
- (void *)dns);
- if(!dns2) {
- free(dns);
- free(entry_id);
- return NULL;
- }
-
- dns = dns2;
- dns->inuse++; /* mark entry as in-use */
-
- /* free the allocated entry_id */
- free(entry_id);
-
- return dns;
-}
-
-/*
- * Curl_resolv() is the main name resolve function within libcurl. It resolves
- * a name and returns a pointer to the entry in the 'entry' argument (if one
- * is provided). This function might return immediately if we're using asynch
- * resolves. See the return codes.
- *
- * The cache entry we return will get its 'inuse' counter increased when this
- * function is used. You MUST call Curl_resolv_unlock() later (when you're
- * done using this struct) to decrease the counter again.
- *
- * In debug mode, we specifically test for an interface name "LocalHost"
- * and resolve "localhost" instead as a means to permit test cases
- * to connect to a local test server with any host name.
- *
- * Return codes:
- *
- * CURLRESOLV_ERROR (-1) = error, no pointer
- * CURLRESOLV_RESOLVED (0) = OK, pointer provided
- * CURLRESOLV_PENDING (1) = waiting for response, no pointer
- */
-
-CURL_STATIC int Curl_resolv(struct connectdata *conn,
- const char *hostname,
- int port,
- struct Curl_dns_entry **entry)
-{
- struct Curl_dns_entry *dns = NULL;
- struct SessionHandle *data = conn->data;
- CURLcode result;
- int rc = CURLRESOLV_ERROR; /* default to failure */
-
- *entry = NULL;
-
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- dns = fetch_addr(conn, hostname, port);
-
- if(dns) {
- infof(data, "Hostname %s was found in DNS cache\n", hostname);
- dns->inuse++; /* we use it! */
- rc = CURLRESOLV_RESOLVED;
- }
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-
- if(!dns) {
- /* The entry was not in the cache. Resolve it to IP address */
-
- Curl_addrinfo *addr;
- int respwait;
-
- /* Check what IP specifics the app has requested and if we can provide it.
- * If not, bail out. */
- if(!Curl_ipvalid(conn))
- return CURLRESOLV_ERROR;
-
- /* If Curl_getaddrinfo() returns NULL, 'respwait' might be set to a
- non-zero value indicating that we need to wait for the response to the
- resolve call */
- addr = Curl_getaddrinfo(conn,
-#ifdef DEBUGBUILD
- (data->set.str[STRING_DEVICE]
- && !strcmp(data->set.str[STRING_DEVICE],
- "LocalHost"))?"localhost":
-#endif
- hostname, port, &respwait);
-
- if(!addr) {
- if(respwait) {
- /* the response to our resolve call will come asynchronously at
- a later time, good or bad */
- /* First, check that we haven't received the info by now */
- result = Curl_resolver_is_resolved(conn, &dns);
- if(result) /* error detected */
- return CURLRESOLV_ERROR;
- if(dns)
- rc = CURLRESOLV_RESOLVED; /* pointer provided */
- else
- rc = CURLRESOLV_PENDING; /* no info yet */
- }
- }
- else {
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- /* we got a response, store it in the cache */
- dns = Curl_cache_addr(data, addr, hostname, port);
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-
- if(!dns)
- /* returned failure, bail out nicely */
- Curl_freeaddrinfo(addr);
- else
- rc = CURLRESOLV_RESOLVED;
- }
- }
-
- *entry = dns;
-
- return rc;
-}
-
-#ifdef USE_ALARM_TIMEOUT
-/*
- * This signal handler jumps back into the main libcurl code and continues
- * execution. This effectively causes the remainder of the application to run
- * within a signal handler which is nonportable and could lead to problems.
- */
-static
-RETSIGTYPE alarmfunc(int sig)
-{
- /* this is for "-ansi -Wall -pedantic" to stop complaining! (rabe) */
- (void)sig;
- siglongjmp(curl_jmpenv, 1);
- return;
-}
-#endif /* USE_ALARM_TIMEOUT */
-
-/*
- * Curl_resolv_timeout() is the same as Curl_resolv() but specifies a
- * timeout. This function might return immediately if we're using asynch
- * resolves. See the return codes.
- *
- * The cache entry we return will get its 'inuse' counter increased when this
- * function is used. You MUST call Curl_resolv_unlock() later (when you're
- * done using this struct) to decrease the counter again.
- *
- * If built with a synchronous resolver and use of signals is not
- * disabled by the application, then a nonzero timeout will cause a
- * timeout after the specified number of milliseconds. Otherwise, timeout
- * is ignored.
- *
- * Return codes:
- *
- * CURLRESOLV_TIMEDOUT(-2) = warning, time too short or previous alarm expired
- * CURLRESOLV_ERROR (-1) = error, no pointer
- * CURLRESOLV_RESOLVED (0) = OK, pointer provided
- * CURLRESOLV_PENDING (1) = waiting for response, no pointer
- */
-
-CURL_STATIC int Curl_resolv_timeout(struct connectdata *conn,
- const char *hostname,
- int port,
- struct Curl_dns_entry **entry,
- long timeoutms)
-{
-#ifdef USE_ALARM_TIMEOUT
-#ifdef HAVE_SIGACTION
- struct sigaction keep_sigact; /* store the old struct here */
- volatile bool keep_copysig = FALSE; /* wether old sigact has been saved */
- struct sigaction sigact;
-#else
-#ifdef HAVE_SIGNAL
- void (*keep_sigact)(int); /* store the old handler here */
-#endif /* HAVE_SIGNAL */
-#endif /* HAVE_SIGACTION */
- volatile long timeout;
- volatile unsigned int prev_alarm = 0;
- struct SessionHandle *data = conn->data;
-#endif /* USE_ALARM_TIMEOUT */
- int rc;
-
- *entry = NULL;
-
- if(timeoutms < 0)
- /* got an already expired timeout */
- return CURLRESOLV_TIMEDOUT;
-
-#ifdef USE_ALARM_TIMEOUT
- if(data->set.no_signal)
- /* Ignore the timeout when signals are disabled */
- timeout = 0;
- else
- timeout = timeoutms;
-
- if(!timeout)
- /* USE_ALARM_TIMEOUT defined, but no timeout actually requested */
- return Curl_resolv(conn, hostname, port, entry);
-
- if(timeout < 1000)
- /* The alarm() function only provides integer second resolution, so if
- we want to wait less than one second we must bail out already now. */
- return CURLRESOLV_TIMEDOUT;
-
- /* This allows us to time-out from the name resolver, as the timeout
- will generate a signal and we will siglongjmp() from that here.
- This technique has problems (see alarmfunc).
- This should be the last thing we do before calling Curl_resolv(),
- as otherwise we'd have to worry about variables that get modified
- before we invoke Curl_resolv() (and thus use "volatile"). */
- if(sigsetjmp(curl_jmpenv, 1)) {
- /* this is coming from a siglongjmp() after an alarm signal */
- failf(data, "name lookup timed out");
- rc = CURLRESOLV_ERROR;
- goto clean_up;
- }
- else {
- /*************************************************************
- * Set signal handler to catch SIGALRM
- * Store the old value to be able to set it back later!
- *************************************************************/
-#ifdef HAVE_SIGACTION
- sigaction(SIGALRM, NULL, &sigact);
- keep_sigact = sigact;
- keep_copysig = TRUE; /* yes, we have a copy */
- sigact.sa_handler = alarmfunc;
-#ifdef SA_RESTART
- /* HPUX doesn't have SA_RESTART but defaults to that behaviour! */
- sigact.sa_flags &= ~SA_RESTART;
-#endif
- /* now set the new struct */
- sigaction(SIGALRM, &sigact, NULL);
-#else /* HAVE_SIGACTION */
- /* no sigaction(), revert to the much lamer signal() */
-#ifdef HAVE_SIGNAL
- keep_sigact = signal(SIGALRM, alarmfunc);
-#endif
-#endif /* HAVE_SIGACTION */
-
- /* alarm() makes a signal get sent when the timeout fires off, and that
- will abort system calls */
- prev_alarm = alarm(curlx_sltoui(timeout/1000L));
- }
-
-#else
-#ifndef CURLRES_ASYNCH
- if(timeoutms)
- infof(conn->data, "timeout on name lookup is not supported\n");
-#else
- (void)timeoutms; /* timeoutms not used with an async resolver */
-#endif
-#endif /* USE_ALARM_TIMEOUT */
-
- /* Perform the actual name resolution. This might be interrupted by an
- * alarm if it takes too long.
- */
- rc = Curl_resolv(conn, hostname, port, entry);
-
-#ifdef USE_ALARM_TIMEOUT
-clean_up:
-
- if(!prev_alarm)
- /* deactivate a possibly active alarm before uninstalling the handler */
- alarm(0);
-
-#ifdef HAVE_SIGACTION
- if(keep_copysig) {
- /* we got a struct as it looked before, now put that one back nice
- and clean */
- sigaction(SIGALRM, &keep_sigact, NULL); /* put it back */
- }
-#else
-#ifdef HAVE_SIGNAL
- /* restore the previous SIGALRM handler */
- signal(SIGALRM, keep_sigact);
-#endif
-#endif /* HAVE_SIGACTION */
-
- /* switch back the alarm() to either zero or to what it was before minus
- the time we spent until now! */
- if(prev_alarm) {
- /* there was an alarm() set before us, now put it back */
- unsigned long elapsed_ms = Curl_tvdiff(Curl_tvnow(), conn->created);
-
- /* the alarm period is counted in even number of seconds */
- unsigned long alarm_set = prev_alarm - elapsed_ms/1000;
-
- if(!alarm_set ||
- ((alarm_set >= 0x80000000) && (prev_alarm < 0x80000000)) ) {
- /* if the alarm time-left reached zero or turned "negative" (counted
- with unsigned values), we should fire off a SIGALRM here, but we
- won't, and zero would be to switch it off so we never set it to
- less than 1! */
- alarm(1);
- rc = CURLRESOLV_TIMEDOUT;
- failf(data, "Previous alarm fired off!");
- }
- else
- alarm((unsigned int)alarm_set);
- }
-#endif /* USE_ALARM_TIMEOUT */
-
- return rc;
-}
-
-/*
- * Curl_resolv_unlock() unlocks the given cached DNS entry. When this has been
- * made, the struct may be destroyed due to pruning. It is important that only
- * one unlock is made for each Curl_resolv() call.
- *
- * May be called with 'data' == NULL for global cache.
- */
-CURL_STATIC void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns)
-{
- if(data && data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- freednsentry(dns);
-
- if(data && data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-}
-
-/*
- * File-internal: release cache dns entry reference, free if inuse drops to 0
- */
-static void freednsentry(void *freethis)
-{
- struct Curl_dns_entry *dns = (struct Curl_dns_entry *) freethis;
- DEBUGASSERT(dns && (dns->inuse>0));
-
- dns->inuse--;
- if(dns->inuse == 0) {
- Curl_freeaddrinfo(dns->addr);
- free(dns);
- }
-}
-
-/*
- * Curl_mk_dnscache() creates a new DNS cache and returns the handle for it.
- */
-CURL_STATIC struct curl_hash *Curl_mk_dnscache(void)
-{
- return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry);
-}
-
-/*
- * Curl_hostcache_clean()
- *
- * This _can_ be called with 'data' == NULL but then of course no locking
- * can be done!
- */
-
-CURL_STATIC void Curl_hostcache_clean(struct SessionHandle *data,
- struct curl_hash *hash)
-{
- if(data && data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- Curl_hash_clean(hash);
-
- if(data && data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-}
-
-
-CURL_STATIC CURLcode Curl_loadhostpairs(struct SessionHandle *data)
-{
- struct curl_slist *hostp;
- char hostname[256];
- char address[256];
- int port;
-
- for(hostp = data->change.resolve; hostp; hostp = hostp->next ) {
- if(!hostp->data)
- continue;
- if(hostp->data[0] == '-') {
- char *entry_id;
- size_t entry_len;
-
- if(2 != sscanf(hostp->data + 1, "%255[^:]:%d", hostname, &port)) {
- infof(data, "Couldn't parse CURLOPT_RESOLVE removal entry '%s'!\n",
- hostp->data);
- continue;
- }
-
- /* Create an entry id, based upon the hostname and port */
- entry_id = create_hostcache_id(hostname, port);
- /* If we can't create the entry id, fail */
- if(!entry_id) {
- return CURLE_OUT_OF_MEMORY;
- }
-
- entry_len = strlen(entry_id);
-
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- /* delete entry, ignore if it didn't exist */
- Curl_hash_delete(data->dns.hostcache, entry_id, entry_len+1);
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-
- /* free the allocated entry_id again */
- free(entry_id);
- }
- else {
- struct Curl_dns_entry *dns;
- Curl_addrinfo *addr;
- char *entry_id;
- size_t entry_len;
-
- if(3 != sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,
- address)) {
- infof(data, "Couldn't parse CURLOPT_RESOLVE entry '%s'!\n",
- hostp->data);
- continue;
- }
-
- addr = Curl_str2addr(address, port);
- if(!addr) {
- infof(data, "Address in '%s' found illegal!\n", hostp->data);
- continue;
- }
-
- /* Create an entry id, based upon the hostname and port */
- entry_id = create_hostcache_id(hostname, port);
- /* If we can't create the entry id, fail */
- if(!entry_id) {
- Curl_freeaddrinfo(addr);
- return CURLE_OUT_OF_MEMORY;
- }
-
- entry_len = strlen(entry_id);
-
- if(data->share)
- Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
-
- /* See if its already in our dns cache */
- dns = Curl_hash_pick(data->dns.hostcache, entry_id, entry_len+1);
-
- /* free the allocated entry_id again */
- free(entry_id);
-
- if(!dns) {
- /* if not in the cache already, put this host in the cache */
- dns = Curl_cache_addr(data, addr, hostname, port);
- if(dns) {
- dns->timestamp = 0; /* mark as added by CURLOPT_RESOLVE */
- /* release the returned reference; the cache itself will keep the
- * entry alive: */
- dns->inuse--;
- }
- }
- else
- /* this is a duplicate, free it again */
- Curl_freeaddrinfo(addr);
-
- if(data->share)
- Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
-
- if(!dns) {
- Curl_freeaddrinfo(addr);
- return CURLE_OUT_OF_MEMORY;
- }
- infof(data, "Added %s:%d:%s to DNS cache\n",
- hostname, port, address);
- }
- }
- data->change.resolve = NULL; /* dealt with now */
-
- return CURLE_OK;
-}