/* Resolve a name and return a pointer in the 'entry' argument if one
is available.
Return codes:
-1 = error, no pointer
0 = OK, pointer provided
1 = waiting for response, no pointer
*/
int Curl_resolv(struct connectdata *conn,
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;
/* default to failure */
int rc = -1;
*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 && sigsetjmp(curl_jmpenv, 1)) {
/* this is coming from a siglongjmp() */
failf(data, "name lookup timed out");
return -1;
}
#endif
/* Create an entry id, based upon the hostname and port */
entry_id = create_hostcache_id(hostname, port, &entry_len);
/* If we can't create the entry id, fail */
if (!entry_id)
return -1;
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->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);
if (!dns) {
/* The entry was not in the cache. Resolve it to IP address */
/* If my_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 */
Curl_addrinfo *addr = my_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 -1;
if(dns)
rc = 0; /* pointer provided */
else
rc = 1; /* 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 = cache_resolv_response(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 = 0;
}
}
else {
dns->inuse++; /* we use it! */
rc = 0;
}
*entry = dns;
return rc;
}
CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
{
struct Curl_multi *multi=(struct Curl_multi *)multi_handle;
struct Curl_one_easy *easy;
bool done;
CURLMcode result=CURLM_OK;
struct Curl_message *msg;
bool connected;
bool async;
*running_handles = 0; /* bump this once for every living handle */
if(!GOOD_MULTI_HANDLE(multi))
return CURLM_BAD_HANDLE;
easy=multi->easy.next;
while(easy) {
#if 0
fprintf(stderr, "HANDLE %p: State: %x\n",
(char *)easy, easy->state);
#endif
do {
if (CURLM_STATE_WAITCONNECT <= easy->state &&
easy->state <= CURLM_STATE_DO &&
easy->easy_handle->change.url_changed) {
char *gotourl;
Curl_posttransfer(easy->easy_handle);
easy->result = Curl_done(&easy->easy_conn, CURLE_OK);
if(CURLE_OK == easy->result) {
gotourl = strdup(easy->easy_handle->change.url);
if(gotourl) {
easy->easy_handle->change.url_changed = FALSE;
easy->result = Curl_follow(easy->easy_handle, gotourl);
if(CURLE_OK == easy->result)
easy->state = CURLM_STATE_CONNECT;
else
free(gotourl);
}
else {
easy->result = CURLE_OUT_OF_MEMORY;
easy->state = CURLM_STATE_COMPLETED;
break;
}
}
}
easy->easy_handle->change.url_changed = FALSE;
switch(easy->state) {
case CURLM_STATE_INIT:
/* init this transfer. */
easy->result=Curl_pretransfer(easy->easy_handle);
if(CURLE_OK == easy->result) {
/* after init, go CONNECT */
easy->state = CURLM_STATE_CONNECT;
result = CURLM_CALL_MULTI_PERFORM;
easy->easy_handle->state.used_interface = Curl_if_multi;
}
break;
case CURLM_STATE_CONNECT:
/* Connect. We get a connection identifier filled in. */
Curl_pgrsTime(easy->easy_handle, TIMER_STARTSINGLE);
easy->result = Curl_connect(easy->easy_handle, &easy->easy_conn,
&async);
if(CURLE_OK == easy->result) {
if(async)
/* We're now waiting for an asynchronous name lookup */
easy->state = CURLM_STATE_WAITRESOLVE;
else {
/* after the connect has been sent off, go WAITCONNECT */
easy->state = CURLM_STATE_WAITCONNECT;
result = CURLM_CALL_MULTI_PERFORM;
}
}
break;
case CURLM_STATE_WAITRESOLVE:
/* awaiting an asynch name resolve to complete */
{
struct Curl_dns_entry *dns = NULL;
/* check if we have the name resolved by now */
easy->result = Curl_is_resolved(easy->easy_conn, &dns);
if(dns) {
/* Perform the next step in the connection phase, and then move on
to the WAITCONNECT state */
easy->result = Curl_async_resolved(easy->easy_conn);
if(CURLE_OK != easy->result)
/* if Curl_async_resolved() returns failure, the connection struct
is already freed and gone */
easy->easy_conn = NULL; /* no more connection */
easy->state = CURLM_STATE_WAITCONNECT;
}
if(CURLE_OK != easy->result) {
/* failure detected */
Curl_disconnect(easy->easy_conn); /* disconnect properly */
easy->easy_conn = NULL; /* no more connection */
break;
}
}
break;
case CURLM_STATE_WAITCONNECT:
/* awaiting a completion of an asynch connect */
easy->result = Curl_is_connected(easy->easy_conn, FIRSTSOCKET,
&connected);
if(connected)
easy->result = Curl_protocol_connect(easy->easy_conn);
if(CURLE_OK != easy->result) {
/* failure detected */
Curl_disconnect(easy->easy_conn); /* close the connection */
easy->easy_conn = NULL; /* no more connection */
break;
}
if(connected) {
/* after the connect has completed, go DO */
easy->state = CURLM_STATE_DO;
result = CURLM_CALL_MULTI_PERFORM;
}
break;
case CURLM_STATE_DO:
/* Do the fetch or put request */
easy->result = Curl_do(&easy->easy_conn);
if(CURLE_OK == easy->result) {
/* after do, go PERFORM... or DO_MORE */
if(easy->easy_conn->bits.do_more) {
/* we're supposed to do more, but we need to sit down, relax
and wait a little while first */
easy->state = CURLM_STATE_DO_MORE;
result = CURLM_OK;
}
else {
/* we're done with the DO, now PERFORM */
easy->result = Curl_readwrite_init(easy->easy_conn);
if(CURLE_OK == easy->result) {
easy->state = CURLM_STATE_PERFORM;
result = CURLM_CALL_MULTI_PERFORM;
}
}
}
break;
case CURLM_STATE_DO_MORE:
/*
* First, check if we really are ready to do more.
*/
easy->result = Curl_is_connected(easy->easy_conn, SECONDARYSOCKET,
&connected);
if(connected) {
/*
* When we are connected, DO MORE and then go PERFORM
*/
easy->result = Curl_do_more(easy->easy_conn);
if(CURLE_OK == easy->result)
easy->result = Curl_readwrite_init(easy->easy_conn);
if(CURLE_OK == easy->result) {
easy->state = CURLM_STATE_PERFORM;
result = CURLM_CALL_MULTI_PERFORM;
}
}
break;
case CURLM_STATE_PERFORM:
/* read/write data if it is ready to do so */
easy->result = Curl_readwrite(easy->easy_conn, &done);
if(easy->result) {
/* The transfer phase returned error, we mark the connection to get
* closed to prevent being re-used. This is becasue we can't
* possibly know if the connection is in a good shape or not now. */
easy->easy_conn->bits.close = TRUE;
if(CURL_SOCKET_BAD != easy->easy_conn->sock[SECONDARYSOCKET]) {
/* if we failed anywhere, we must clean up the secondary socket if
it was used */
sclose(easy->easy_conn->sock[SECONDARYSOCKET]);
easy->easy_conn->sock[SECONDARYSOCKET]=-1;
}
Curl_posttransfer(easy->easy_handle);
Curl_done(&easy->easy_conn, easy->result);
}
/* after the transfer is done, go DONE */
else if(TRUE == done) {
/* call this even if the readwrite function returned error */
Curl_posttransfer(easy->easy_handle);
/* When we follow redirects, must to go back to the CONNECT state */
if(easy->easy_conn->newurl) {
char *newurl = easy->easy_conn->newurl;
easy->easy_conn->newurl = NULL;
easy->result = Curl_done(&easy->easy_conn, CURLE_OK);
if(easy->result == CURLE_OK)
easy->result = Curl_follow(easy->easy_handle, newurl);
if(CURLE_OK == easy->result) {
easy->state = CURLM_STATE_CONNECT;
result = CURLM_CALL_MULTI_PERFORM;
}
}
else {
easy->state = CURLM_STATE_DONE;
result = CURLM_CALL_MULTI_PERFORM;
}
}
break;
case CURLM_STATE_DONE:
/* post-transfer command */
easy->result = Curl_done(&easy->easy_conn, CURLE_OK);
/* after we have DONE what we're supposed to do, go COMPLETED, and
it doesn't matter what the Curl_done() returned! */
easy->state = CURLM_STATE_COMPLETED;
break;
case CURLM_STATE_COMPLETED:
/* this is a completed transfer, it is likely to still be connected */
/* This node should be delinked from the list now and we should post
an information message that we are complete. */
break;
default:
return CURLM_INTERNAL_ERROR;
}
if(CURLM_STATE_COMPLETED != easy->state) {
if(CURLE_OK != easy->result) {
/*
* If an error was returned, and we aren't in completed state now,
* then we go to completed and consider this transfer aborted. */
easy->state = CURLM_STATE_COMPLETED;
}
else
/* this one still lives! */
(*running_handles)++;
}
} while (easy->easy_handle->change.url_changed);
if ((CURLM_STATE_COMPLETED == easy->state) && !easy->msg) {
/* clear out the usage of the shared DNS cache */
easy->easy_handle->hostcache = NULL;
/* now add a node to the Curl_message linked list with this info */
msg = (struct Curl_message *)malloc(sizeof(struct Curl_message));
if(!msg)
return CURLM_OUT_OF_MEMORY;
msg->extmsg.msg = CURLMSG_DONE;
msg->extmsg.easy_handle = easy->easy_handle;
msg->extmsg.data.result = easy->result;
msg->next=NULL;
easy->msg = msg;
easy->msg_num = 1; /* there is one unread message here */
multi->num_msgs++; /* increase message counter */
}
easy = easy->next; /* operate on next handle */
}
return result;
}
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_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;
}
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;
}
