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;
*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) {
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;
}
break;
case CURLM_STATE_CONNECT:
if (Curl_global_host_cache_use(easy->easy_handle)) {
easy->easy_handle->hostcache = Curl_global_host_cache_get();
}
else {
if (multi->hostcache == NULL) {
multi->hostcache = curl_hash_alloc(7, Curl_freeaddrinfo);
}
easy->easy_handle->hostcache = multi->hostcache;
}
/* Connect. We get a connection identifier filled in. */
easy->result = Curl_connect(easy->easy_handle, &easy->easy_conn);
/* after connect, go DO */
if(CURLE_OK == easy->result) {
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);
/* after do, go PERFORM */
if(CURLE_OK == easy->result) {
if(CURLE_OK == Curl_readwrite_init(easy->easy_conn)) {
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);
/* hm, when we follow redirects, we may need to go back to the CONNECT
state */
/* after the transfer is done, go DONE */
if(TRUE == done) {
/* call this even if the readwrite function returned error */
easy->result = Curl_posttransfer(easy->easy_handle);
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);
/* after we have DONE what we're supposed to do, go COMPLETED */
if(CURLE_OK == easy->result)
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) &&
(CURLE_OK != easy->result)) {
/*
* If an error was returned, and we aren't in completed now,
* then we go to completed and consider this transfer aborted.
*/
easy->state = CURLM_STATE_COMPLETED;
}
else if(CURLM_STATE_COMPLETED != easy->state)
/* this one still lives! */
(*running_handles)++;
easy = easy->next; /* operate on next handle */
}
return result;
}
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;
}
/*
* Curl_file() is the protocol-specific function for the do-phase, separated
* from the connect-phase above. Other protocols merely setup the transfer in
* the do-phase, to have it done in the main transfer loop but since some
* platforms we support don't allow select()ing etc on file handles (as
* opposed to sockets) we instead perform the whole do-operation in this
* function.
*/
CURLcode Curl_file(struct connectdata *conn, bool *done)
{
/* This implementation ignores the host name in conformance with
RFC 1738. Only local files (reachable via the standard file system)
are supported. This means that files on remotely mounted directories
(via NFS, Samba, NT sharing) can be accessed through a file:// URL
*/
CURLcode res = CURLE_OK;
struct_stat statbuf; /* struct_stat instead of struct stat just to allow the
Windows version to have a different struct without
having to redefine the simple word 'stat' */
curl_off_t expected_size=0;
bool fstated=FALSE;
ssize_t nread;
struct SessionHandle *data = conn->data;
char *buf = data->state.buffer;
curl_off_t bytecount = 0;
int fd;
struct timeval now = Curl_tvnow();
*done = TRUE; /* unconditionally */
Curl_readwrite_init(conn);
Curl_initinfo(data);
Curl_pgrsStartNow(data);
if(data->set.upload)
return file_upload(conn);
/* get the fd from the connection phase */
fd = conn->proto.file->fd;
/* VMS: This only works reliable for STREAMLF files */
if( -1 != fstat(fd, &statbuf)) {
/* we could stat it, then read out the size */
expected_size = statbuf.st_size;
fstated = TRUE;
}
/* If we have selected NOBODY and HEADER, it means that we only want file
information. Which for FILE can't be much more than the file size and
date. */
if(conn->bits.no_body && data->set.include_header && fstated) {
CURLcode result;
snprintf(buf, sizeof(data->state.buffer),
"Content-Length: %" FORMAT_OFF_T "\r\n", expected_size);
result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0);
if(result)
return result;
result = Curl_client_write(data, CLIENTWRITE_BOTH,
(char *)"Accept-ranges: bytes\r\n", 0);
if(result)
return result;
if(fstated) {
struct tm *tm;
time_t clock = (time_t)statbuf.st_mtime;
#ifdef HAVE_GMTIME_R
struct tm buffer;
tm = (struct tm *)gmtime_r(&clock, &buffer);
#else
tm = gmtime(&clock);
#endif
/* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
snprintf(buf, BUFSIZE-1,
"Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0);
}
return result;
}
if (conn->resume_from <= expected_size)
expected_size -= conn->resume_from;
else {
failf(data, "failed to resume file:// transfer");
return CURLE_BAD_DOWNLOAD_RESUME;
}
if (fstated && (expected_size == 0))
return CURLE_OK;
/* The following is a shortcut implementation of file reading
this is both more efficient than the former call to download() and
it avoids problems with select() and recv() on file descriptors
in Winsock */
if(fstated)
Curl_pgrsSetDownloadSize(data, expected_size);
if(conn->resume_from)
lseek(fd, conn->resume_from, SEEK_SET);
Curl_pgrsTime(data, TIMER_STARTTRANSFER);
while (res == CURLE_OK) {
nread = read(fd, buf, BUFSIZE-1);
if ( nread > 0)
buf[nread] = 0;
if (nread <= 0)
break;
bytecount += nread;
res = Curl_client_write(data, CLIENTWRITE_BODY, buf, nread);
if(res)
return res;
Curl_pgrsSetDownloadCounter(data, bytecount);
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
else
res = Curl_speedcheck(data, now);
}
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
return res;
}
