/**
* cifs_compose_mount_options - creates mount options for refferral
* @sb_mountdata: parent/root DFS mount options (template)
* @fullpath: full path in UNC format
* @ref: server's referral
* @devname: pointer for saving device name
*
* creates mount options for submount based on template options sb_mountdata
* and replacing unc,ip,prefixpath options with ones we've got form ref_unc.
*
* Returns: pointer to new mount options or ERR_PTR.
* Caller is responcible for freeing retunrned value if it is not error.
*/
char *cifs_compose_mount_options(const char *sb_mountdata,
const char *fullpath,
const struct dfs_info3_param *ref,
char **devname)
{
int rc;
char *mountdata = NULL;
int md_len;
char *tkn_e;
char *srvIP = NULL;
char sep = ',';
int off, noff;
if (sb_mountdata == NULL)
return ERR_PTR(-EINVAL);
*devname = cifs_get_share_name(ref->node_name);
if (IS_ERR(*devname)) {
rc = PTR_ERR(*devname);
*devname = NULL;
goto compose_mount_options_err;
}
rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
if (rc < 0) {
cERROR(1, "%s: Failed to resolve server part of %s to IP: %d",
__func__, *devname, rc);
goto compose_mount_options_err;
}
/* md_len = strlen(...) + 12 for 'sep+prefixpath='
* assuming that we have 'unc=' and 'ip=' in
* the original sb_mountdata
*/
md_len = strlen(sb_mountdata) + rc + strlen(ref->node_name) + 12;
mountdata = kzalloc(md_len+1, GFP_KERNEL);
if (mountdata == NULL) {
rc = -ENOMEM;
goto compose_mount_options_err;
}
/* copy all options except of unc,ip,prefixpath */
off = 0;
if (strncmp(sb_mountdata, "sep=", 4) == 0) {
sep = sb_mountdata[4];
strncpy(mountdata, sb_mountdata, 5);
off += 5;
}
do {
tkn_e = strchr(sb_mountdata + off, sep);
if (tkn_e == NULL)
noff = strlen(sb_mountdata + off);
else
noff = tkn_e - (sb_mountdata + off) + 1;
if (strnicmp(sb_mountdata + off, "unc=", 4) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata + off, "ip=", 3) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata + off, "prefixpath=", 11) == 0) {
off += noff;
continue;
}
strncat(mountdata, sb_mountdata + off, noff);
off += noff;
} while (tkn_e);
strcat(mountdata, sb_mountdata + off);
mountdata[md_len] = '\0';
/* copy new IP and ref share name */
if (mountdata[strlen(mountdata) - 1] != sep)
strncat(mountdata, &sep, 1);
strcat(mountdata, "ip=");
strcat(mountdata, srvIP);
strncat(mountdata, &sep, 1);
strcat(mountdata, "unc=");
strcat(mountdata, *devname);
/* find & copy prefixpath */
tkn_e = strchr(ref->node_name + 2, '\\');
if (tkn_e == NULL) {
/* invalid unc, missing share name*/
rc = -EINVAL;
goto compose_mount_options_err;
}
tkn_e = strchr(tkn_e + 1, '\\');
if (tkn_e || (strlen(fullpath) - ref->path_consumed)) {
strncat(mountdata, &sep, 1);
strcat(mountdata, "prefixpath=");
if (tkn_e)
strcat(mountdata, tkn_e + 1);
strcat(mountdata, fullpath + ref->path_consumed);
}
/*cFYI(1, "%s: parent mountdata: %s", __func__,sb_mountdata);*/
/*cFYI(1, "%s: submount mountdata: %s", __func__, mountdata );*/
compose_mount_options_out:
kfree(srvIP);
return mountdata;
compose_mount_options_err:
kfree(mountdata);
mountdata = ERR_PTR(rc);
goto compose_mount_options_out;
}
struct vfsmount *cifs_dfs_do_refmount(const struct vfsmount *mnt_parent,
struct dentry *dentry, char *ref_unc)
{
int rc;
struct cifs_sb_info *cifs_sb;
struct sockaddr_in sin_server;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
char *mountdata;
int md_len;
char *devname;
char *tkn_e;
char srvIP[16];
char sep = ',';
int off, noff;
cFYI(1, ("in %s", __FUNCTION__ ));
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
if ( cifs_sb->mountdata == NULL ) {
return ERR_PTR(-EINVAL);
}
devname = cifs_get_share_name(ref_unc);
rc = cifs_resolve_server_name_to_ip( devname, &(sin_server.sin_addr));
snprintf(srvIP, sizeof(srvIP), "%u.%u.%u.%u",
NIPQUAD(sin_server.sin_addr));
if (rc != 0) {
if (devname) kfree(devname);
cERROR(1, ("%s: failed to resolve server part of %s to IP",
__FUNCTION__, devname ));
rc = -EINVAL;
return ERR_PTR(rc);
}
srvIP[sizeof(srvIP)-1] = '\0';
md_len = strlen(cifs_sb->mountdata) + sizeof(srvIP) +
strlen(ref_unc) + 3;
mountdata = kzalloc(md_len+1, GFP_KERNEL);
/* copy all options except unc,ip,prefixpath */
off = 0;
if (strncmp(cifs_sb->mountdata, "sep=", 4) == 0) {
sep = cifs_sb->mountdata[4];
strncpy(mountdata, cifs_sb->mountdata, 5);
off += 5;
}
while ( (tkn_e = strchr(cifs_sb->mountdata+off, sep)) ) {
noff = (tkn_e - (cifs_sb->mountdata+off)) + 1;
if (strnicmp(cifs_sb->mountdata+off, "unc=", 4) == 0) {
off += noff;
continue;
}
if (strnicmp(cifs_sb->mountdata+off, "ip=", 3) == 0) {
off += noff;
continue;
}
if (strnicmp(cifs_sb->mountdata+off, "prefixpath=", 3) == 0) {
off += noff;
continue;
}
strncat(mountdata, cifs_sb->mountdata+off, noff);
off += noff;
}
strcat(mountdata, cifs_sb->mountdata+off);
mountdata[md_len] = '\0';
strcat(mountdata, ", ip="); strcat(mountdata, srvIP);
strcat(mountdata, ", unc="); strcat(mountdata, devname);
/* find prefixpath */
tkn_e = strchr(ref_unc+2, '\\');
if ( tkn_e ) {
tkn_e = strchr(tkn_e+1, '\\');
if ( tkn_e ) {
strcat(mountdata, ",prefixpath=");
strcat(mountdata, tkn_e);
}
}
/*cFYI(1,("%s: old mountdata: %s", __FUNCTION__,cifs_sb->mountdata));*/
/*cFYI(1, ("%s: new mountdata: %s", __FUNCTION__, mountdata ));*/
mnt = vfs_kern_mount(&cifs_fs_type, 0, devname, mountdata);
if (devname)
kfree(devname);
if (mountdata)
kfree(mountdata);
cFYI(1, ("leaving %s", __FUNCTION__ ));
return mnt;
}
char *cifs_compose_mount_options(const char *sb_mountdata,
const char *fullpath,
const struct dfs_info3_param *ref,
char **devname)
{
int rc;
char *mountdata = NULL;
int md_len;
char *tkn_e;
char *srvIP = NULL;
char sep = ',';
int off, noff;
if (sb_mountdata == NULL)
return ERR_PTR(-EINVAL);
*devname = cifs_get_share_name(ref->node_name);
if (IS_ERR(*devname)) {
rc = PTR_ERR(*devname);
*devname = NULL;
goto compose_mount_options_err;
}
rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
if (rc < 0) {
cFYI(1, "%s: Failed to resolve server part of %s to IP: %d",
__func__, *devname, rc);
goto compose_mount_options_err;
}
md_len = strlen(sb_mountdata) + rc + strlen(ref->node_name) + 12;
mountdata = kzalloc(md_len+1, GFP_KERNEL);
if (mountdata == NULL) {
rc = -ENOMEM;
goto compose_mount_options_err;
}
off = 0;
if (strncmp(sb_mountdata, "sep=", 4) == 0) {
sep = sb_mountdata[4];
strncpy(mountdata, sb_mountdata, 5);
off += 5;
}
do {
tkn_e = strchr(sb_mountdata + off, sep);
if (tkn_e == NULL)
noff = strlen(sb_mountdata + off);
else
noff = tkn_e - (sb_mountdata + off) + 1;
if (strnicmp(sb_mountdata + off, "unc=", 4) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata + off, "ip=", 3) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata + off, "prefixpath=", 11) == 0) {
off += noff;
continue;
}
strncat(mountdata, sb_mountdata + off, noff);
off += noff;
} while (tkn_e);
strcat(mountdata, sb_mountdata + off);
mountdata[md_len] = '\0';
if (mountdata[strlen(mountdata) - 1] != sep)
strncat(mountdata, &sep, 1);
strcat(mountdata, "ip=");
strcat(mountdata, srvIP);
strncat(mountdata, &sep, 1);
strcat(mountdata, "unc=");
strcat(mountdata, *devname);
tkn_e = strchr(ref->node_name + 2, '\\');
if (tkn_e == NULL) {
rc = -EINVAL;
goto compose_mount_options_err;
}
tkn_e = strchr(tkn_e + 1, '\\');
if (tkn_e || (strlen(fullpath) - ref->path_consumed)) {
strncat(mountdata, &sep, 1);
strcat(mountdata, "prefixpath=");
if (tkn_e)
strcat(mountdata, tkn_e + 1);
strcat(mountdata, fullpath + ref->path_consumed);
}
compose_mount_options_out:
kfree(srvIP);
return mountdata;
compose_mount_options_err:
kfree(mountdata);
mountdata = ERR_PTR(rc);
kfree(*devname);
*devname = NULL;
goto compose_mount_options_out;
}
/**
* compose_mount_options - creates mount options for refferral
* @sb_mountdata: parent/root DFS mount options (template)
* @ref_unc: refferral server UNC
* @devname: pointer for saving device name
*
* creates mount options for submount based on template options sb_mountdata
* and replacing unc,ip,prefixpath options with ones we've got form ref_unc.
*
* Returns: pointer to new mount options or ERR_PTR.
* Caller is responcible for freeing retunrned value if it is not error.
*/
static char *compose_mount_options(const char *sb_mountdata,
const char *ref_unc,
char **devname)
{
int rc;
char *mountdata;
int md_len;
char *tkn_e;
char *srvIP = NULL;
char sep = ',';
int off, noff;
if (sb_mountdata == NULL)
return ERR_PTR(-EINVAL);
*devname = cifs_get_share_name(ref_unc);
rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
if (rc != 0) {
cERROR(1, ("%s: Failed to resolve server part of %s to IP",
__func__, *devname));
mountdata = ERR_PTR(rc);
goto compose_mount_options_out;
}
md_len = strlen(sb_mountdata) + strlen(srvIP) + strlen(ref_unc) + 3;
mountdata = kzalloc(md_len+1, GFP_KERNEL);
if (mountdata == NULL) {
mountdata = ERR_PTR(-ENOMEM);
goto compose_mount_options_out;
}
/* copy all options except of unc,ip,prefixpath */
off = 0;
if (strncmp(sb_mountdata, "sep=", 4) == 0) {
sep = sb_mountdata[4];
strncpy(mountdata, sb_mountdata, 5);
off += 5;
}
while ((tkn_e = strchr(sb_mountdata+off, sep))) {
noff = (tkn_e - (sb_mountdata+off)) + 1;
if (strnicmp(sb_mountdata+off, "unc=", 4) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata+off, "ip=", 3) == 0) {
off += noff;
continue;
}
if (strnicmp(sb_mountdata+off, "prefixpath=", 3) == 0) {
off += noff;
continue;
}
strncat(mountdata, sb_mountdata+off, noff);
off += noff;
}
strcat(mountdata, sb_mountdata+off);
mountdata[md_len] = '\0';
/* copy new IP and ref share name */
strcat(mountdata, ",ip=");
strcat(mountdata, srvIP);
strcat(mountdata, ",unc=");
strcat(mountdata, *devname);
/* find & copy prefixpath */
tkn_e = strchr(ref_unc+2, '\\');
if (tkn_e) {
tkn_e = strchr(tkn_e+1, '\\');
if (tkn_e) {
strcat(mountdata, ",prefixpath=");
strcat(mountdata, tkn_e+1);
}
}
/*cFYI(1,("%s: parent mountdata: %s", __func__,sb_mountdata));*/
/*cFYI(1, ("%s: submount mountdata: %s", __func__, mountdata ));*/
compose_mount_options_out:
kfree(srvIP);
return mountdata;
}
