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[2015-07-02 18:45 UTC] info at josephcrawford dot com
Description: ------------ I am using the following library https://github.com/ideaconnect/idct-sftp-client When I try to get a directory listing of files from an SFTP connection I am getting the following error. Segmentation fault: 11 I am using PHP 5.6.9 that was installed via Homebrew. However I also tried using the PHP version that shipped with Zend Server (uninstalled after testing) which I believe was 5.6.x and I was getting the same results. Test script: --------------- <?php use \IDCT\Networking\Ssh\SftpClient; $sftp = new SftpClient(); $credentials = Credentials::withPassword('username', 'password'); $sftp->setCredentials($credentials); $sftp->connect('hostname.goes.here', 22); $remote_files = $sftp->getFileList('your_path_here/'); Expected result: ---------------- I expect an array of filenames that reside on the server path that I specify in the getFileList method. Actual result: -------------- Segmentation Fault: 11 This is the line that causes the actual segmentation fault which I verified with var_dump before the loop, inside the loop and after the loop. The only place the var_dump worked was before the loop. https://github.com/ideaconnect/idct-sftp-client/blob/master/src/SftpClient.php#L521 Patchesssh2_sftp_pathfix (last revision 2015-11-06 17:10 UTC by ken at pardiac dot com)Pull RequestsHistoryAllCommentsChangesGit/SVN commits
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I am also going to add that I have tried to use the following work-arounds and they also fail when it comes time to read the directory. <?php // Segmentation Fault: 11 $files = scandir("ssh2.sftp://$sftp/$remotePath"); // This works $handle = dir("ssh2.sftp://$sftp/$remotePath"); // UNTIL you do this while (false !== ($entry = $handle->read())) { It would appear that it is something in the lower level C programming for the PHP core or the ssh2 extension which would segmentation fault when it comes to memory issues. I verified the total number of files in the directory is 29,516 and not 60,000 like I first estimated. My resized images folder has 60,000 images in it but I am not trying to list that directory.This is about as simple as you can get. The following code provides me with the Segmentation Fault as seen below.. // RESPONSE jcrawford@Josephs-Mac-mini:~/TraderTools (dev *%) # php sftp_test.php Segmentation fault: 11 // CODE <?php $ssh2 = ssh2_connect(‘you.domain.here’, 8022); ssh2_auth_password($ssh2, ‘username’, ‘password’); $sftp = ssh2_sftp($ssh2); $handle = opendir("ssh2.sftp://$sftp/YourDirHere/”); $files = array(); while (false != ($entry = readdir($handle))){ $files[] = $entry; } var_dump($files);Here is some output of what I get when I use the base directory that only has a few files in the directory. Again the images folder has 29,516 images and the directory structure and server management are not under my control. jcrawford@Josephs-Mac-mini:~/TraderTools (dev *%) # php sftp_test.php array(4) { [0]=> string(14) "CatInfoJSC.zip" [1]=> string(16) "ItemAvailJSC.zip" [2]=> string(15) "METADataJSC.txt" [3]=> string(6) "Images" }This bug was introduced as a by-product of bug # 59794. I have re-written the fix for that bug in the pecl ssh2-0.12 package source. Here is my patch to the ssh2_fopen_wrappers.c module. This fix re-constructs the filename from the path, query and fragment components after the URL is parsed. The problem was that if the path component matched any previous part of the URL string which is the case when just a "/" is the path. It matches the first "/" in the URL. Chaos ensues. Perhaps one of the developers can take a look at this. Ken Pardiac --- ssh2_fopen_wrappers.c 2012-10-02 16:18:07.000000000 -0400 +++ ssh2_fopen_wrappers.c 2015-11-06 11:20:40.436490279 -0500 @@ -219,12 +219,29 @@ } /* - Find resource->path in the path string, then copy the entire string from the original path. - This includes ?query#fragment in the path string + Put path, query and fragment from the url back together to get a filename + that may have contained ? or #. */ - s = resource->path; - resource->path = estrdup(strstr(path, resource->path)); - efree(s); + if ( resource->query || resource->fragment ) { + char *p; + int len = strlen(resource->path) + 1; + if ( resource->query ) + len += strlen(resource->query) + 1; + if ( resource->fragment ) + len += strlen(resource->fragment) + 1; + p = emalloc( len ); + strcpy( p, resource->path ); + if ( resource->query ) { + strcat( p, "?" ); + strcat( p, resource->query ); + } + if ( resource->fragment ) { + strcat( p, "#" ); + strcat( p, resource->fragment ); + } + efree( resource->path ); + resource->path = p; + } /* Look for a resource ID to reuse a session */ s = resource->host;I had the same issue after update my php. Try to use intval() function: $handle = opendir("ssh2.sftp://".intval($sftp)."/path/to/directory");