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curl_multi_fdset: correct fdset with FTP PORT use

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After a PORT has been issued, and the multi handle would switch to the
CURLM_STATE_DO_MORE state (which is unique for FTP), libcurl would
return the wrong fdset to wait for when curl_multi_fdset() is
called. The code would blindly assume that it was waiting for a connect
of the second connection, while that isn't true immediately after the
PORT command.

Also, the function multi.c:domore_getsock() was highly FTP-centric and
therefore ugly to keep in protocol-agnostic code. I solved this problem
by introducing a new function pointer in the Curl_handler struct called
domore_getsock() which is only called during the DOMORE state for
protocols that set that pointer.

The new ftp.c:ftp_domore_getsock() function now returns fdset info about
the control connection's command/response handling while such a state is
in use, and goes over to waiting for a writable second connection first
once the commands are done.

The original problem could be seen by running test 525 and checking the
time stamps in the FTP server log. I can verify that this fix at least
fixes this problem.

Bug: http://curl.haxx.se/mail/lib-2011-10/0250.html
Reported by: Gokhan Sengun
This commit is contained in:
Daniel Stenberg 2011-10-21 23:36:54 +02:00
parent d67b75c9f9
commit d7934b8bd4
18 changed files with 81 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/curl_rtmp.c
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@ -71,6 +71,7 @@ const struct Curl_handler Curl_handler_rtmp = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -90,6 +91,7 @@ const struct Curl_handler Curl_handler_rtmpt = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -109,6 +111,7 @@ const struct Curl_handler Curl_handler_rtmpe = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -128,6 +131,7 @@ const struct Curl_handler Curl_handler_rtmpte = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -147,6 +151,7 @@ const struct Curl_handler Curl_handler_rtmps = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -166,6 +171,7 @@ const struct Curl_handler Curl_handler_rtmpts = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtmp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/dict.c
View File

@ -92,6 +92,7 @@ const struct Curl_handler Curl_handler_dict = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/file.c
View File

@ -113,6 +113,7 @@ const struct Curl_handler Curl_handler_file = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
file_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */

40
lib/ftp.c
View File

@ -134,8 +134,9 @@ static CURLcode ftp_connect(struct connectdata *conn, bool *done);
static CURLcode ftp_disconnect(struct connectdata *conn, bool dead_connection);
static CURLcode ftp_nextconnect(struct connectdata *conn);
static CURLcode ftp_multi_statemach(struct connectdata *conn, bool *done);
static int ftp_getsock(struct connectdata *conn,
curl_socket_t *socks,
static int ftp_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static int ftp_domore_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static CURLcode ftp_doing(struct connectdata *conn,
bool *dophase_done);
@ -171,6 +172,7 @@ const struct Curl_handler Curl_handler_ftp = {
ftp_doing, /* doing */
ftp_getsock, /* proto_getsock */
ftp_getsock, /* doing_getsock */
ftp_domore_getsock, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -196,6 +198,7 @@ const struct Curl_handler Curl_handler_ftps = {
ftp_doing, /* doing */
ftp_getsock, /* proto_getsock */
ftp_getsock, /* doing_getsock */
ftp_domore_getsock, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -222,6 +225,7 @@ static const struct Curl_handler Curl_handler_ftp_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -247,6 +251,7 @@ static const struct Curl_handler Curl_handler_ftps_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -634,6 +639,37 @@ static int ftp_getsock(struct connectdata *conn,
return Curl_pp_getsock(&conn->proto.ftpc.pp, socks, numsocks);
}
/* For the FTP "DO_MORE" phase only */
static int ftp_domore_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
if(!numsocks)
return GETSOCK_BLANK;
/* When in DO_MORE state, we could be either waiting for us to connect to a
remote site, or we could wait for that site to connect to us. Or just
handle ordinary commands.
When waiting for a connect, we will be in FTP_STOP state and then we wait
for the secondary socket to become writeable. If we're in another state,
we're still handling commands on the control (primary) connection.
*/
switch(ftpc->state) {
case FTP_STOP:
break;
default:
return Curl_pp_getsock(&conn->proto.ftpc.pp, socks, numsocks);
}
socks[0] = conn->sock[SECONDARYSOCKET];
return GETSOCK_READSOCK(0);
}
/* This is called after the FTP_QUOTE state is passed.
ftp_state_cwd() sends the range of CWD commands to the server to change to

1
lib/gopher.c
View File

@ -97,6 +97,7 @@ const struct Curl_handler Curl_handler_gopher = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

2
lib/http.c
View File

@ -118,6 +118,7 @@ const struct Curl_handler Curl_handler_http = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
http_getsock_do, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -141,6 +142,7 @@ const struct Curl_handler Curl_handler_https = {
ZERO_NULL, /* doing */
https_getsock, /* proto_getsock */
http_getsock_do, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

4
lib/imap.c
View File

@ -119,6 +119,7 @@ const struct Curl_handler Curl_handler_imap = {
imap_doing, /* doing */
imap_getsock, /* proto_getsock */
imap_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
imap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -144,6 +145,7 @@ const struct Curl_handler Curl_handler_imaps = {
imap_doing, /* doing */
imap_getsock, /* proto_getsock */
imap_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
imap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -169,6 +171,7 @@ static const struct Curl_handler Curl_handler_imap_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -194,6 +197,7 @@ static const struct Curl_handler Curl_handler_imaps_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

2
lib/ldap.c
View File

@ -130,6 +130,7 @@ const struct Curl_handler Curl_handler_ldap = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -154,6 +155,7 @@ const struct Curl_handler Curl_handler_ldaps = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

14
lib/multi.c
View File

@ -816,20 +816,12 @@ static int waitconnect_getsock(struct connectdata *conn,
}
static int domore_getsock(struct connectdata *conn,
curl_socket_t *sock,
curl_socket_t *socks,
int numsocks)
{
if(!numsocks)
if(conn && conn->handler->domore_getsock)
return conn->handler->domore_getsock(conn, socks, numsocks);
return GETSOCK_BLANK;
/* When in DO_MORE state, we could be either waiting for us
to connect to a remote site, or we could wait for that site
to connect to us. It makes a difference in the way: if we
connect to the site we wait for the socket to become writable, if
the site connects to us we wait for it to become readable */
sock[0] = conn->sock[SECONDARYSOCKET];
return GETSOCK_WRITESOCK(0);
}
/* returns bitmapped flags for this handle and its sockets */

2
lib/openldap.c
View File

@ -83,6 +83,7 @@ const struct Curl_handler Curl_handler_ldap = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ldap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -107,6 +108,7 @@ const struct Curl_handler Curl_handler_ldaps = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ldap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */

4
lib/pop3.c
View File

@ -119,6 +119,7 @@ const struct Curl_handler Curl_handler_pop3 = {
pop3_doing, /* doing */
pop3_getsock, /* proto_getsock */
pop3_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
pop3_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -144,6 +145,7 @@ const struct Curl_handler Curl_handler_pop3s = {
pop3_doing, /* doing */
pop3_getsock, /* proto_getsock */
pop3_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
pop3_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -169,6 +171,7 @@ static const struct Curl_handler Curl_handler_pop3_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -194,6 +197,7 @@ static const struct Curl_handler Curl_handler_pop3s_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/rtsp.c
View File

@ -113,6 +113,7 @@ const struct Curl_handler Curl_handler_rtsp = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
rtsp_getsock_do, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtsp_disconnect, /* disconnect */
rtsp_rtp_readwrite, /* readwrite */

4
lib/smtp.c
View File

@ -127,6 +127,7 @@ const struct Curl_handler Curl_handler_smtp = {
smtp_doing, /* doing */
smtp_getsock, /* proto_getsock */
smtp_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smtp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -151,6 +152,7 @@ const struct Curl_handler Curl_handler_smtps = {
smtp_doing, /* doing */
smtp_getsock, /* proto_getsock */
smtp_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smtp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -176,6 +178,7 @@ static const struct Curl_handler Curl_handler_smtp_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
@ -200,6 +203,7 @@ static const struct Curl_handler Curl_handler_smtps_proxy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

2
lib/ssh.c
View File

@ -165,6 +165,7 @@ const struct Curl_handler Curl_handler_scp = {
scp_doing, /* doing */
ssh_getsock, /* proto_getsock */
ssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ssh_perform_getsock, /* perform_getsock */
scp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
@ -189,6 +190,7 @@ const struct Curl_handler Curl_handler_sftp = {
sftp_doing, /* doing */
ssh_getsock, /* proto_getsock */
ssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ssh_perform_getsock, /* perform_getsock */
sftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/telnet.c
View File

@ -182,6 +182,7 @@ const struct Curl_handler Curl_handler_telnet = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/tftp.c
View File

@ -184,6 +184,7 @@ const struct Curl_handler Curl_handler_tftp = {
tftp_doing, /* doing */
tftp_getsock, /* proto_getsock */
tftp_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
tftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */

1
lib/url.c
View File

@ -246,6 +246,7 @@ static const struct Curl_handler Curl_handler_dummy = {
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */

6
lib/urldata.h
View File

@ -671,6 +671,12 @@ struct Curl_handler {
curl_socket_t *socks,
int numsocks);
/* Called from the multi interface during the DO_MORE phase, and it should
then return a proper fd set */
int (*domore_getsock)(struct connectdata *conn,
curl_socket_t *socks,
int numsocks);
/* Called from the multi interface during the DO_DONE, PERFORM and
WAITPERFORM phases, and it should then return a proper fd set. Not setting
this will make libcurl use the generic default one. */