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Diffstat (limited to 'libs/libcurl/src/hostip.c')
| -rw-r--r-- | libs/libcurl/src/hostip.c | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/libs/libcurl/src/hostip.c b/libs/libcurl/src/hostip.c new file mode 100644 index 0000000000..f37b4925bb --- /dev/null +++ b/libs/libcurl/src/hostip.c @@ -0,0 +1,827 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2013, 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" + +#define _MPRINTF_REPLACE /* use our functions only */ +#include <curl/mprintf.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. + */ +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 + */ +void Curl_global_host_cache_dtor(void) +{ + if(host_cache_initialized) { + /* first make sure that any custom "CURLOPT_RESOLVE" names are + cleared off */ + Curl_hostcache_clean(NULL, &hostname_cache); + /* then free the remaining hash completely */ + Curl_hash_clean(&hostname_cache); + host_cache_initialized = 0; + } +} + +/* + * Return # of adresses in a Curl_addrinfo struct + */ +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. + */ +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 (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. + */ +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); +} + +/* + * Check if the entry should be pruned. Assumes a locked cache. + */ +static int +remove_entry_if_stale(struct SessionHandle *data, struct Curl_dns_entry *dns) +{ + struct hostcache_prune_data user; + + if(!dns || (data->set.dns_cache_timeout == -1) || !data->dns.hostcache) + /* cache forever means never prune, and NULL hostcache means + we can't do it */ + return 0; + + time(&user.now); + user.cache_timeout = data->set.dns_cache_timeout; + + if(!hostcache_timestamp_remove(&user,dns) ) + return 0; + + Curl_hash_clean_with_criterium(data->dns.hostcache, + (void *) &user, + hostcache_timestamp_remove); + + return 1; +} + + +#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 + + +/* + * 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. + */ +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 = 0; /* init to not used */ + dns->addr = addr; /* this is the address(es) */ + time(&dns->timestamp); + if(dns->timestamp == 0) + dns->timestamp = 1; /* zero indicates that entry isn't in hash table */ + + /* 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 + */ + +int Curl_resolv(struct connectdata *conn, + const char *hostname, + int port, + struct Curl_dns_entry **entry) +{ + char *entry_id = NULL; + struct Curl_dns_entry *dns = NULL; + size_t entry_len; + struct SessionHandle *data = conn->data; + CURLcode result; + int rc = CURLRESOLV_ERROR; /* default to failure */ + + *entry = NULL; + + /* 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 rc; + + 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); + + /* See whether the returned entry is stale. Done before we release lock */ + if(remove_entry_if_stale(data, dns)) + dns = NULL; /* the memory deallocation is being handled by the hash */ + + if(dns) { + 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 + */ + +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; + + /************************************************************* + * 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)); + + /* 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 +#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. + */ +void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns) +{ + DEBUGASSERT(dns && (dns->inuse>0)); + + if(data && data->share) + Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE); + + dns->inuse--; + /* only free if nobody is using AND it is not in hostcache (timestamp == + 0) */ + if(dns->inuse == 0 && dns->timestamp == 0) { + Curl_freeaddrinfo(dns->addr); + free(dns); + } + + if(data && data->share) + Curl_share_unlock(data, CURL_LOCK_DATA_DNS); +} + +/* + * File-internal: free a cache dns entry. + */ +static void freednsentry(void *freethis) +{ + struct Curl_dns_entry *p = (struct Curl_dns_entry *) freethis; + + /* mark the entry as not in hostcache */ + p->timestamp = 0; + if(p->inuse == 0) { + Curl_freeaddrinfo(p->addr); + free(p); + } +} + +/* + * Curl_mk_dnscache() creates a new DNS cache and returns the handle for it. + */ +struct curl_hash *Curl_mk_dnscache(void) +{ + return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry); +} + +static int hostcache_inuse(void *data, void *hc) +{ + struct Curl_dns_entry *c = (struct Curl_dns_entry *) hc; + + if(c->inuse == 1) + Curl_resolv_unlock(data, c); + + return 1; /* free all entries */ +} + +/* + * Curl_hostcache_clean() + * + * This _can_ be called with 'data' == NULL but then of course no locking + * can be done! + */ + +void Curl_hostcache_clean(struct SessionHandle *data, + struct curl_hash *hash) +{ + /* Entries added to the hostcache with the CURLOPT_RESOLVE function are + * still present in the cache with the inuse counter set to 1. Detect them + * and cleanup! + */ + Curl_hash_clean_with_criterium(hash, data, hostcache_inuse); +} + + +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] == '-') { + /* TODO: mark an entry for removal */ + } + else if(3 == sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port, + address)) { + struct Curl_dns_entry *dns; + Curl_addrinfo *addr; + char *entry_id; + size_t entry_len; + + addr = Curl_str2addr(address, port); + if(!addr) { + infof(data, "Resolve %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); + 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; +} |