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;
}
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;
}
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;
}
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;
}
/*
* Lock shared SSL session data
*/
void Curl_ssl_sessionid_lock(struct connectdata *conn)
{
if(SSLSESSION_SHARED(conn->data))
Curl_share_lock(conn->data,
CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
}
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;
int wait;
struct SessionHandle *data = conn->data;
CURLcode result;
int rc;
*entry = NULL;
#ifdef HAVE_SIGSETJMP
/* this allows us to time-out from the name resolver, as the timeout
will generate a signal and we will siglongjmp() from that here */
if(!data->set.no_signal) {
if (sigsetjmp(curl_jmpenv, 1)) {
/* this is coming from a siglongjmp() */
failf(data, "name lookup timed out");
return CURLRESOLV_ERROR;
}
}
#endif
/* 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 CURLRESOLV_ERROR;
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);
if(data->share)
Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
/* free the allocated entry_id again */
free(entry_id);
/* See whether the returned entry is stale. Deliberately done after the
locked block */
if ( remove_entry_if_stale(data,dns) )
dns = NULL; /* the memory deallocation is being handled by the hash */
rc = CURLRESOLV_ERROR; /* default to failure */
if (!dns) {
/* The entry was not in the cache. Resolve it to IP address */
Curl_addrinfo *addr;
/* Check what IP specifics the app has requested and if we can provide it.
* If not, bail out. */
if(!Curl_ipvalid(data))
return CURLRESOLV_ERROR;
/* If Curl_getaddrinfo() returns NULL, 'wait' 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, hostname, port, &wait);
if (!addr) {
if(wait) {
/* 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_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;
}
}
else {
if(data->share)
Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
dns->inuse++; /* we use it! */
if(data->share)
Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
rc = CURLRESOLV_RESOLVED;
}
*entry = dns;
return rc;
}
/*
* Store session id in the session cache. The ID passed on to this function
* must already have been extracted and allocated the proper way for the SSL
* layer. Curl_XXXX_session_free() will be called to free/kill the session ID
* later on.
*/
CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
void *ssl_sessionid,
size_t idsize)
{
size_t i;
struct SessionHandle *data=conn->data; /* the mother of all structs */
struct curl_ssl_session *store = &data->state.session[0];
long oldest_age=data->state.session[0].age; /* zero if unused */
char *clone_host;
long *general_age;
/* Even though session ID re-use might be disabled, that only disables USING
IT. We still store it here in case the re-using is again enabled for an
upcoming transfer */
clone_host = strdup(conn->host.name);
if(!clone_host)
return CURLE_OUT_OF_MEMORY; /* bail out */
/* Now we should add the session ID and the host name to the cache, (remove
the oldest if necessary) */
/* If using shared SSL session, lock! */
if(SSLSESSION_SHARED(data)) {
Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
general_age = &data->share->sessionage;
}
else {
general_age = &data->state.sessionage;
}
/* find an empty slot for us, or find the oldest */
for(i = 1; (i < data->set.ssl.max_ssl_sessions) &&
data->state.session[i].sessionid; i++) {
if(data->state.session[i].age < oldest_age) {
oldest_age = data->state.session[i].age;
store = &data->state.session[i];
}
}
if(i == data->set.ssl.max_ssl_sessions)
/* cache is full, we must "kill" the oldest entry! */
Curl_ssl_kill_session(store);
else
store = &data->state.session[i]; /* use this slot */
/* now init the session struct wisely */
store->sessionid = ssl_sessionid;
store->idsize = idsize;
store->age = *general_age; /* set current age */
if(store->name)
/* free it if there's one already present */
free(store->name);
store->name = clone_host; /* clone host name */
store->remote_port = conn->remote_port; /* port number */
/* Unlock */
if(SSLSESSION_SHARED(data))
Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION);
if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) {
store->sessionid = NULL; /* let caller free sessionid */
free(clone_host);
return CURLE_OUT_OF_MEMORY;
}
return CURLE_OK;
}
