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-rw-r--r--lib/ssh.c89
1 files changed, 72 insertions, 17 deletions
diff --git a/lib/ssh.c b/lib/ssh.c
index 6d2108bef..1f1650e20 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -40,6 +40,13 @@
#error "this requires libssh2 0.16 or later"
#endif
+#if !defined(HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION) && \
+ (LIBSSH2_VERSION_NUM >= 0x001300)
+/* this is just a check for non-configure based systems to get this properly
+ setup if libssh2 0.19+ is used */
+#define HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION 1
+#endif
+
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
@@ -103,6 +110,7 @@
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "strtoofft.h"
#include "multiif.h"
+#include "select.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
@@ -421,7 +429,14 @@ static CURLcode ssh_getworkingpath(struct connectdata *conn,
return CURLE_OK;
}
-static CURLcode ssh_statemach_act(struct connectdata *conn)
+/*
+ * ssh_statemach_act() runs the SSH statemachine "one round" and returns. The
+ * data the pointer 'block' points to will be set to TRUE if the libssh2
+ * function returns LIBSSH2_ERROR_EAGAIN meaning it wants to be called again
+ * when the socket is ready
+ */
+
+static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
@@ -432,8 +447,9 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
const char *fingerprint;
#endif /* CURL_LIBSSH2_DEBUG */
const char *host_public_key_md5;
- int rc,i;
+ int rc = LIBSSH2_ERROR_NONE, i;
int err;
+ *block = 0; /* we're not blocking by default */
switch(sshc->state) {
case SSH_S_STARTUP:
@@ -519,6 +535,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->authlist) {
if((err = libssh2_session_last_errno(sshc->ssh_session)) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -729,6 +746,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->sftp_session) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -996,21 +1014,21 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
* This takes an extra protocol round trip.
*/
rc = libssh2_sftp_stat(sshc->sftp_session, sshc->quote_path2,
- &sshc->quote_attrs);
+ &sshc->quote_attrs);
if(rc == LIBSSH2_ERROR_EAGAIN) {
- break;
+ break;
}
else if(rc != 0) { /* get those attributes */
- err = libssh2_sftp_last_error(sshc->sftp_session);
- Curl_safefree(sshc->quote_path1);
- sshc->quote_path1 = NULL;
- Curl_safefree(sshc->quote_path2);
- sshc->quote_path2 = NULL;
- failf(data, "Attempt to get SFTP stats failed: %s",
- sftp_libssh2_strerror(err));
- state(conn, SSH_SFTP_CLOSE);
- sshc->actualcode = CURLE_QUOTE_ERROR;
- break;
+ err = libssh2_sftp_last_error(sshc->sftp_session);
+ Curl_safefree(sshc->quote_path1);
+ sshc->quote_path1 = NULL;
+ Curl_safefree(sshc->quote_path2);
+ sshc->quote_path2 = NULL;
+ failf(data, "Attempt to get SFTP stats failed: %s",
+ sftp_libssh2_strerror(err));
+ state(conn, SSH_SFTP_CLOSE);
+ sshc->actualcode = CURLE_QUOTE_ERROR;
+ break;
}
}
@@ -1233,6 +1251,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->sftp_handle) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -1387,6 +1406,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->sftp_handle) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -1421,6 +1441,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
PATH_MAX,
&sshc->readdir_attrs);
if(sshc->readdir_len == LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
if(sshc->readdir_len > 0) {
@@ -1521,6 +1542,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
sshc->readdir_filename,
PATH_MAX);
if(sshc->readdir_len == LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
Curl_safefree(sshc->readdir_linkPath);
@@ -1578,6 +1600,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
case SSH_SFTP_READDIR_DONE:
if(libssh2_sftp_closedir(sshc->sftp_handle) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
sshc->sftp_handle = NULL;
@@ -1601,6 +1624,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->sftp_handle) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -1814,6 +1838,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->ssh_channel) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -1860,6 +1885,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
if(!sshc->ssh_channel) {
if(libssh2_session_last_errno(sshc->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
+ rc = LIBSSH2_ERROR_EAGAIN;
break;
}
else {
@@ -2011,6 +2037,12 @@ static CURLcode ssh_statemach_act(struct connectdata *conn)
break;
}
+ if(rc == LIBSSH2_ERROR_EAGAIN) {
+ /* we would block, we need to wait for the socket to be ready (in the
+ right direction too)! */
+ *block = TRUE;
+ }
+
return result;
}
@@ -2019,8 +2051,11 @@ static CURLcode ssh_multi_statemach(struct connectdata *conn, bool *done)
{
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
+ bool block_we_ignore; /* we don't care about EAGAIN at this point, but TODO:
+ we _should_ store the status and use that to
+ provide a ssh_getsock() implementation */
- result = ssh_statemach_act(conn);
+ result = ssh_statemach_act(conn, &block_we_ignore);
*done = (bool)(sshc->state == SSH_STOP);
return result;
@@ -2031,8 +2066,28 @@ static CURLcode ssh_easy_statemach(struct connectdata *conn)
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
- while((sshc->state != SSH_STOP) && !result)
- result = ssh_statemach_act(conn);
+ while((sshc->state != SSH_STOP) && !result) {
+ bool block;
+ result = ssh_statemach_act(conn, &block);
+
+#ifdef HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION
+ if((CURLE_OK == result) && block) {
+ int dir = libssh2_session_block_directions(sshc->ssh_session);
+ curl_socket_t sock = conn->sock[FIRSTSOCKET];
+ curl_socket_t fd_read = CURL_SOCKET_BAD;
+ curl_socket_t fd_write = CURL_SOCKET_BAD;
+ if (LIBSSH2_SESSION_BLOCK_INBOUND & dir) {
+ fd_read = sock;
+ }
+ if (LIBSSH2_SESSION_BLOCK_OUTBOUND & dir) {
+ fd_write = sock;
+ }
+ /* wait for the socket to become ready */
+ Curl_socket_ready(fd_read, fd_write, 1000); /* ignore result */
+ }
+#endif
+
+ }
return result;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 19:28:26 +0000