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Make _libssh2_sftp_mkdir_ex() fully non-blocking safe. This makes

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libssh2_sftp_mkdirnb_ex() non-blocking safe and libssh2_sftp_mkdir_ex()
blocking safe
This commit is contained in:
James Housley
2007-04-22 19:51:24 +00:00
parent 510df9bf52
commit a66885c51c
2 changed files with 138 additions and 41 deletions
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177
src/sftp.c
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@@ -93,6 +93,12 @@ typedef enum {
sftp_write_packet_sent
} libssh2_sftp_write_state;
typedef enum {
sftp_mkdir_idle = 0,
sftp_mkdir_packet_created,
sftp_mkdir_packet_sent
} libssh2_sftp_mkdir_state;
struct _LIBSSH2_SFTP {
LIBSSH2_CHANNEL *channel;
@@ -128,6 +134,11 @@ struct _LIBSSH2_SFTP {
unsigned char *write_packet;
unsigned long write_request_id;
/* State variables used in _libssh2_sftp_mkdir() */
libssh2_sftp_mkdir_state mkdir_state;
unsigned char *mkdir_packet;
unsigned long mkdir_request_id;
};
#define LIBSSH2_SFTP_HANDLE_FILE 0
@@ -1355,6 +1366,12 @@ LIBSSH2_API ssize_t libssh2_sftp_write(LIBSSH2_SFTP_HANDLE *handle,
/* restore state */
libssh2_channel_set_blocking(ch, bl);
if(rc < 0) {
/* precent accidental returning of other return codes since
this API does not support/provide those */
return -1;
}
return rc;
}
/* }}} */
@@ -1692,67 +1709,145 @@ LIBSSH2_API int libssh2_sftp_rename_ex(LIBSSH2_SFTP *sftp, const char *source_f
}
/* }}} */
/* {{{ libssh2_sftp_mkdir_ex
* Create a directory
/* {{{ _libssh2_sftp_mkdir_ex
* Create an SFTP directory using blocking/non-blocking depending on state
*/
/* libssh2_sftp_mkdir_ex - NB-UNSAFE?? */
LIBSSH2_API int libssh2_sftp_mkdir_ex(LIBSSH2_SFTP *sftp, const char *path, unsigned int path_len, long mode)
/* _libssh2_sftp_mkdir_ex - NB-SAFE */
static int _libssh2_sftp_mkdir_ex(LIBSSH2_SFTP *sftp, const char *path, unsigned int path_len, long mode)
{
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
LIBSSH2_SFTP_ATTRIBUTES attrs = {
LIBSSH2_SFTP_ATTR_PERMISSIONS, 0, 0, 0, 0, 0, 0
};
unsigned long data_len, retcode, request_id;
ssize_t packet_len = path_len + 13 + libssh2_sftp_attrsize(&attrs);
/* packet_len(4) + packet_type(1) + request_id(4) + path_len(4) */
unsigned char *packet, *s, *data;
int rc;
unsigned long data_len, retcode, request_id;
ssize_t packet_len = path_len + 13 + libssh2_sftp_attrsize(&attrs);
/* packet_len(4) + packet_type(1) + request_id(4) + path_len(4) */
unsigned char *packet, *s, *data;
int rc;
if (sftp->mkdir_state == sftp_mkdir_idle) {
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Creating directory %s with mode 0%lo", path, mode);
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_MKDIR packet", 0);
return -1;
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_MKDIR packet", 0);
return -1;
}
/* Filetype in SFTP 3 and earlier */
attrs.permissions = mode | LIBSSH2_SFTP_ATTR_PFILETYPE_DIR;
libssh2_htonu32(s, packet_len - 4); s += 4;
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = SSH_FXP_MKDIR;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, path_len); s += 4;
memcpy(s, path, path_len); s += path_len;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, path_len); s += 4;
memcpy(s, path, path_len); s += path_len;
s += libssh2_sftp_attr2bin(s, &attrs);
if (packet_len != libssh2_channel_write(channel, (char *)packet,
packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_MKDIR command", 0);
sftp->mkdir_state = sftp_mkdir_packet_created;
} else {
packet = sftp->mkdir_packet;
request_id = sftp->mkdir_request_id;
}
if (sftp->mkdir_state != sftp_mkdir_packet_sent) {
if (libssh2_channel_get_blocking(channel)) {
if (packet_len != libssh2_channel_write(channel, (char *)packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_READ command", 0);
LIBSSH2_FREE(session, packet);
sftp->mkdir_state = sftp_mkdir_idle;
return -1;
}
} else {
if ((rc = libssh2_channel_writenb(channel, (char *)packet, packet_len)) == PACKET_EAGAIN) {
sftp->mkdir_packet = packet;
sftp->mkdir_request_id = request_id;
return PACKET_EAGAIN;
}
if (packet_len != rc) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_READ command", 0);
LIBSSH2_FREE(session, packet);
sftp->mkdir_state = sftp_mkdir_idle;
return -1;
}
}
LIBSSH2_FREE(session, packet);
sftp->mkdir_state = sftp_mkdir_packet_sent;
sftp->mkdir_packet = NULL;
}
rc = libssh2_sftp_packet_require(sftp, SSH_FXP_STATUS, request_id, &data, &data_len);
if (rc == PACKET_EAGAIN) {
return PACKET_EAGAIN;
}
else if (rc) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
sftp->mkdir_state = sftp_mkdir_idle;
return -1;
}
sftp->mkdir_state = sftp_mkdir_idle;
retcode = libssh2_ntohu32(data + 5);
LIBSSH2_FREE(session, data);
if (retcode == LIBSSH2_FX_OK) {
return 0;
} else {
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "SFTP Protocol Error", 0);
sftp->last_errno = retcode;
return -1;
}
}
/* }}} */
/* #warning "XXX - Looping on PACKET_EAGAIN (blocking) until fix is migrated up farther" */
while ((rc = libssh2_sftp_packet_require(sftp, SSH_FXP_STATUS, request_id, &data, &data_len)) == PACKET_EAGAIN) {
;
}
if (rc) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
return -1;
}
/* {{{ libssh2_sftp_mkdir_ex
* Create a directory
*/
/* libssh2_sftp_mkdir_ex - NB-UNSAFE */
LIBSSH2_API int libssh2_sftp_mkdir_ex(LIBSSH2_SFTP *sftp, const char *path, unsigned int path_len, long mode)
{
ssize_t rc;
LIBSSH2_CHANNEL *ch = sftp->channel;
int bl = libssh2_channel_get_blocking(ch);
/* set blocking */
libssh2_channel_set_blocking(ch, 1);
rc = _libssh2_sftp_mkdir_ex(sftp, path, path_len, mode);
/* restore state */
libssh2_channel_set_blocking(ch, bl);
if(rc < 0) {
/* precent accidental returning of other return codes since
this API does not support/provide those */
return -1;
}
return rc;
}
/* }}} */
retcode = libssh2_ntohu32(data + 5);
LIBSSH2_FREE(session, data);
if (retcode == LIBSSH2_FX_OK) {
return 0;
} else {
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "SFTP Protocol Error", 0);
sftp->last_errno = retcode;
return -1;
}
/* {{{ libssh2_sftp_mkdirnb_ex
* Create a directory
*/
/* libssh2_sftp_mkdirnb_ex - NB-SAFE */
LIBSSH2_API int libssh2_sftp_mkdirnb_ex(LIBSSH2_SFTP *sftp, const char *path, unsigned int path_len, long mode)
{
ssize_t rc;
LIBSSH2_CHANNEL *ch = sftp->channel;
int bl = libssh2_channel_get_blocking(ch);
/* set non-blocking */
libssh2_channel_set_blocking(ch, 0);
rc = _libssh2_sftp_mkdir_ex(sftp, path, path_len, mode);
/* restore state */
libssh2_channel_set_blocking(ch, bl);
return rc;
}
/* }}} */