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GUACAMOLE-818: Break SFTP directory JSON at blob boundaries. Do not skip entries.

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The intent of the previous version of the SFTP directory listing code
was to break the JSON transfer at blob boundaries, waiting for an ack
before sending the next blob, however the ordering of the "blob_written"
and directory read checks could result in a directory entry being
skipped at the boundary of each blob.

The proper order would be to check the "blob_written" flag first,
however the "blob_written" flag is unnecessary. It's simpler and more
correct to just break out of the loop once the desired blob has been
flushed.
This commit is contained in:
Michael Jumper 2020-02-24 17:55:06 -08:00
parent 090bb3bbea
commit 8ea9b14a80
1 changed files with 5 additions and 6 deletions
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11
src/common-ssh/sftp.c
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@ -586,7 +586,6 @@ static int guac_common_ssh_sftp_ls_ack_handler(guac_user* user,
guac_stream* stream, char* message, guac_protocol_status status) {
int bytes_read;
int blob_written = 0;
char filename[GUAC_COMMON_SSH_SFTP_MAX_PATH];
LIBSSH2_SFTP_ATTRIBUTES attributes;
@ -608,8 +607,7 @@ static int guac_common_ssh_sftp_ls_ack_handler(guac_user* user,
/* While directory entries remain */
while ((bytes_read = libssh2_sftp_readdir(list_state->directory,
filename, sizeof(filename), &attributes)) > 0
&& !blob_written) {
filename, sizeof(filename), &attributes)) > 0) {
char absolute_path[GUAC_COMMON_SSH_SFTP_MAX_PATH];
@ -639,9 +637,10 @@ static int guac_common_ssh_sftp_ls_ack_handler(guac_user* user,
else
mimetype = "application/octet-stream";
/* Write entry */
blob_written |= guac_common_json_write_property(user, stream,
&list_state->json_state, absolute_path, mimetype);
/* Write entry, waiting for next ack if a blob is written */
if (guac_common_json_write_property(user, stream,
&list_state->json_state, absolute_path, mimetype))
break;
}