mirror of
https://git.libssh.org/projects/libssh.git
synced 2025-12-02 01:17:52 +03:00
Improve sftp_parse_attr_4().
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@591 7dcaeef0-15fb-0310-b436-a5af3365683c
This commit is contained in:
Andreas Schneider
279
libssh/sftp.c
279
libssh/sftp.c
@@ -749,144 +749,167 @@ SFTP_DIR *sftp_opendir(SFTP_SESSION *sftp, const char *path){
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return NULL;
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}
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/* parse the attributes from a payload from some messages */
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/* i coded it on baselines from the protocol version 4. */
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/* please excuse me for the inaccuracy of the code. it isn't my fault, it's sftp draft's one */
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/* this code is dead anyway ... */
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/* version 4 specific code */
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/*
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* Parse the attributes from a payload from some messages. It is coded on
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* baselines from the protocol version 4.
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* This code is more or less dead but maybe we need it in future.
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*/
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static SFTP_ATTRIBUTES *sftp_parse_attr_4(SFTP_SESSION *sftp, BUFFER *buf,
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int expectnames) {
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u32 flags=0;
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SFTP_ATTRIBUTES *attr;
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STRING *owner=NULL;
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STRING *group=NULL;
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int ok=0;
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SFTP_ATTRIBUTES *attr;
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STRING *owner = NULL;
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STRING *group = NULL;
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u32 flags = 0;
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int ok = 0;
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/* unused member variable */
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(void) expectnames;
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/* unused member variable */
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(void) expectnames;
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attr = malloc(sizeof(SFTP_ATTRIBUTES));
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if (attr == NULL) {
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return NULL;
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attr = malloc(sizeof(SFTP_ATTRIBUTES));
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if (attr == NULL) {
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return NULL;
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}
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ZERO_STRUCTP(attr);
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/* This isn't really a loop, but it is like a try..catch.. */
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do {
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if (buffer_get_u32(buf, &flags) != 4) {
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break;
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}
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memset(attr,0,sizeof(*attr));
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/* it isn't really a loop, but i use it because it's like a try..catch.. construction in C */
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do {
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if(buffer_get_u32(buf,&flags)!=4)
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break;
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flags=ntohl(flags);
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attr->flags=flags;
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if(flags & SSH_FILEXFER_ATTR_SIZE){
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if(buffer_get_u64(buf,&attr->size)!=8)
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break;
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attr->size=ntohll(attr->size);
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}
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if(flags & SSH_FILEXFER_ATTR_OWNERGROUP){
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if(!(owner=buffer_get_ssh_string(buf)))
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break;
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if(!(group=buffer_get_ssh_string(buf)))
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break;
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}
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if(flags & SSH_FILEXFER_ATTR_PERMISSIONS){
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if(buffer_get_u32(buf,&attr->permissions)!=4)
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break;
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attr->permissions=ntohl(attr->permissions);
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flags = ntohl(flags);
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attr->flags = flags;
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switch (attr->permissions & S_IFMT) {
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case S_IFSOCK:
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case S_IFBLK:
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case S_IFCHR:
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case S_IFIFO:
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attr->type = SSH_FILEXFER_TYPE_SPECIAL;
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break;
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case S_IFLNK:
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attr->type = SSH_FILEXFER_TYPE_SYMLINK;
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break;
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case S_IFREG:
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attr->type = SSH_FILEXFER_TYPE_REGULAR;
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break;
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case S_IFDIR:
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attr->type = SSH_FILEXFER_TYPE_DIRECTORY;
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break;
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default:
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attr->type = SSH_FILEXFER_TYPE_UNKNOWN;
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break;
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}
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}
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if(flags & SSH_FILEXFER_ATTR_ACCESSTIME){
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if(buffer_get_u64(buf,&attr->atime64)!=8)
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break;
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attr->atime64=ntohll(attr->atime64);
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}
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if(flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES){
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if(buffer_get_u32(buf,&attr->atime_nseconds)!=4)
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break;
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attr->atime_nseconds=ntohl(attr->atime_nseconds);
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}
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if(flags & SSH_FILEXFER_ATTR_CREATETIME){
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if(buffer_get_u64(buf,&attr->createtime)!=8)
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break;
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attr->createtime=ntohll(attr->createtime);
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}
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if(flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES){
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if(buffer_get_u32(buf,&attr->createtime_nseconds)!=4)
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break;
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attr->createtime_nseconds=ntohl(attr->createtime_nseconds);
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}
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if(flags & SSH_FILEXFER_ATTR_MODIFYTIME){
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if(buffer_get_u64(buf,&attr->mtime64)!=8)
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break;
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attr->mtime64=ntohll(attr->mtime64);
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}
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if(flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES){
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if(buffer_get_u32(buf,&attr->mtime_nseconds)!=4)
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break;
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attr->mtime_nseconds=ntohl(attr->mtime_nseconds);
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}
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if(flags & SSH_FILEXFER_ATTR_ACL){
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if(!(attr->acl=buffer_get_ssh_string(buf)))
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break;
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}
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if (flags & SSH_FILEXFER_ATTR_EXTENDED){
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if(buffer_get_u32(buf,&attr->extended_count)!=4)
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break;
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attr->extended_count=ntohl(attr->extended_count);
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while(attr->extended_count && (attr->extended_type=buffer_get_ssh_string(buf))
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&& (attr->extended_data=buffer_get_ssh_string(buf))){
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attr->extended_count--;
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}
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if(attr->extended_count)
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break;
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}
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ok=1;
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} while (0);
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if(!ok){
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/* break issued somewhere */
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if(owner)
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free(owner);
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if(group)
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free(group);
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if(attr->acl)
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free(attr->acl);
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if(attr->extended_type)
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free(attr->extended_type);
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if(attr->extended_data)
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free(attr->extended_data);
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free(attr);
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ssh_set_error(sftp->session,SSH_FATAL,"Invalid ATTR structure");
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return NULL;
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if (flags & SSH_FILEXFER_ATTR_SIZE) {
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if (buffer_get_u64(buf, &attr->size) != 8) {
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break;
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}
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attr->size = ntohll(attr->size);
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}
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/* everything went smoothly */
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if(owner){
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attr->owner=string_to_char(owner);
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free(owner);
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if (flags & SSH_FILEXFER_ATTR_OWNERGROUP) {
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if((owner = buffer_get_ssh_string(buf)) == NULL ||
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(attr->owner = string_to_char(owner)) == NULL) {
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break;
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}
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if ((group = buffer_get_ssh_string(buf)) == NULL ||
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(attr->group = string_to_char(group)) == NULL) {
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break;
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}
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}
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if(group){
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attr->group=string_to_char(group);
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free(group);
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if (flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
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if (buffer_get_u32(buf, &attr->permissions) != 4) {
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break;
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}
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attr->permissions = ntohl(attr->permissions);
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switch (attr->permissions & S_IFMT) {
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case S_IFSOCK:
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case S_IFBLK:
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case S_IFCHR:
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case S_IFIFO:
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attr->type = SSH_FILEXFER_TYPE_SPECIAL;
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break;
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case S_IFLNK:
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attr->type = SSH_FILEXFER_TYPE_SYMLINK;
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break;
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case S_IFREG:
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attr->type = SSH_FILEXFER_TYPE_REGULAR;
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break;
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case S_IFDIR:
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attr->type = SSH_FILEXFER_TYPE_DIRECTORY;
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break;
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default:
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attr->type = SSH_FILEXFER_TYPE_UNKNOWN;
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break;
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}
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}
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return attr;
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if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
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if (buffer_get_u64(buf, &attr->atime64) != 8) {
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break;
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}
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attr->atime64 = ntohll(attr->atime64);
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}
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if (flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES) {
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if (buffer_get_u32(buf, &attr->atime_nseconds) != 4) {
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break;
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}
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attr->atime_nseconds = ntohl(attr->atime_nseconds);
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}
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if (flags & SSH_FILEXFER_ATTR_CREATETIME) {
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if (buffer_get_u64(buf, &attr->createtime) != 8) {
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break;
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}
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attr->createtime = ntohll(attr->createtime);
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}
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if (flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES) {
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if (buffer_get_u32(buf, &attr->createtime_nseconds) != 4) {
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break;
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}
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attr->createtime_nseconds = ntohl(attr->createtime_nseconds);
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}
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if (flags & SSH_FILEXFER_ATTR_MODIFYTIME) {
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if (buffer_get_u64(buf, &attr->mtime64) != 8) {
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break;
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}
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attr->mtime64 = ntohll(attr->mtime64);
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}
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if (flags & SSH_FILEXFER_ATTR_SUBSECOND_TIMES) {
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if (buffer_get_u32(buf, &attr->mtime_nseconds) != 4) {
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break;
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}
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attr->mtime_nseconds = ntohl(attr->mtime_nseconds);
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}
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if (flags & SSH_FILEXFER_ATTR_ACL) {
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if ((attr->acl = buffer_get_ssh_string(buf)) == NULL) {
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break;
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}
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}
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if (flags & SSH_FILEXFER_ATTR_EXTENDED) {
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if (buffer_get_u32(buf,&attr->extended_count) != 4) {
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break;
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}
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attr->extended_count = ntohl(attr->extended_count);
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while(attr->extended_count &&
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(attr->extended_type = buffer_get_ssh_string(buf)) &&
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(attr->extended_data = buffer_get_ssh_string(buf))){
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attr->extended_count--;
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}
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if (attr->extended_count) {
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break;
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}
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}
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ok = 1;
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} while (0);
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if (ok == 0) {
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/* break issued somewhere */
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string_free(owner);
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string_free(group);
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string_free(attr->acl);
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string_free(attr->extended_type);
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string_free(attr->extended_data);
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SAFE_FREE(attr->owner);
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SAFE_FREE(attr->group);
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SAFE_FREE(attr);
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ssh_set_error(sftp->session, SSH_FATAL, "Invalid ATTR structure");
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return NULL;
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}
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return attr;
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}
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/* Version 3 code. it is the only one really supported (the draft for the 4 misses clarifications) */
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