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|
/*
Unix SMB/Netbios implementation.
Version 3.0
MSDfs services for Samba
Copyright (C) Shirish Kalele 2000
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define DBGC_CLASS DBGC_MSDFS
#include "includes.h"
extern uint32 global_client_caps;
/**********************************************************************
Parse the pathname of the form \hostname\service\reqpath
into the dfs_path structure
**********************************************************************/
static BOOL parse_dfs_path(char *pathname, struct dfs_path *pdp)
{
pstring pathname_local;
char *p, *temp;
pstrcpy(pathname_local,pathname);
p = temp = pathname_local;
ZERO_STRUCTP(pdp);
trim_char(temp,'\\','\\');
DEBUG(10,("temp in parse_dfs_path: .%s. after trimming \\'s\n",temp));
/* now tokenize */
/* parse out hostname */
p = strchr_m(temp,'\\');
if(p == NULL) {
return False;
}
*p = '\0';
pstrcpy(pdp->hostname,temp);
DEBUG(10,("parse_dfs_path: hostname: %s\n",pdp->hostname));
/* parse out servicename */
temp = p+1;
p = strchr_m(temp,'\\');
if(p == NULL) {
pstrcpy(pdp->servicename,temp);
pdp->reqpath[0] = '\0';
return True;
}
*p = '\0';
pstrcpy(pdp->servicename,temp);
DEBUG(10,("parse_dfs_path: servicename: %s\n",pdp->servicename));
/* rest is reqpath */
check_path_syntax(pdp->reqpath, p+1);
DEBUG(10,("parse_dfs_path: rest of the path: %s\n",pdp->reqpath));
return True;
}
/**********************************************************************
Parse the pathname of the form /hostname/service/reqpath
into the dfs_path structure
This code is dependent on the fact that check_path_syntax() will
convert '\\' characters to '/'.
When POSIX pathnames have been selected this doesn't happen, so we
must look for the unaltered separator of '\\' instead of the modified '/'.
JRA.
**********************************************************************/
static BOOL parse_processed_dfs_path(char* pathname, struct dfs_path *pdp, BOOL allow_wcards)
{
pstring pathname_local;
char *p,*temp;
const char sepchar = lp_posix_pathnames() ? '\\' : '/';
pstrcpy(pathname_local,pathname);
p = temp = pathname_local;
ZERO_STRUCTP(pdp);
trim_char(temp,sepchar,sepchar);
DEBUG(10,("temp in parse_processed_dfs_path: .%s. after trimming \\'s\n",temp));
/* now tokenize */
/* parse out hostname */
p = strchr_m(temp,sepchar);
if(p == NULL) {
return False;
}
*p = '\0';
pstrcpy(pdp->hostname,temp);
DEBUG(10,("parse_processed_dfs_path: hostname: %s\n",pdp->hostname));
/* parse out servicename */
temp = p+1;
p = strchr_m(temp,sepchar);
if(p == NULL) {
pstrcpy(pdp->servicename,temp);
pdp->reqpath[0] = '\0';
return True;
}
*p = '\0';
pstrcpy(pdp->servicename,temp);
DEBUG(10,("parse_processed_dfs_path: servicename: %s\n",pdp->servicename));
/* rest is reqpath */
if (allow_wcards) {
BOOL path_contains_wcard;
check_path_syntax_wcard(pdp->reqpath, p+1, &path_contains_wcard);
} else {
check_path_syntax(pdp->reqpath, p+1);
}
DEBUG(10,("parse_processed_dfs_path: rest of the path: %s\n",pdp->reqpath));
return True;
}
/********************************************************
Fake up a connection struct for the VFS layer.
Note this CHANGES CWD !!!! JRA.
*********************************************************/
static BOOL create_conn_struct(connection_struct *conn, int snum, char *path)
{
pstring connpath;
ZERO_STRUCTP(conn);
pstrcpy(connpath, path);
pstring_sub(connpath , "%S", lp_servicename(snum));
/* needed for smbd_vfs_init() */
if ( (conn->mem_ctx=talloc_init("connection_struct")) == NULL ) {
DEBUG(0,("talloc_init(connection_struct) failed!\n"));
return False;
}
if (!(conn->params = TALLOC_P(conn->mem_ctx, struct share_params))) {
DEBUG(0, ("TALLOC failed\n"));
return False;
}
conn->params->service = snum;
set_conn_connectpath(conn, connpath);
if (!smbd_vfs_init(conn)) {
DEBUG(0,("create_conn_struct: smbd_vfs_init failed.\n"));
conn_free_internal(conn);
return False;
}
/*
* Windows seems to insist on doing trans2getdfsreferral() calls on the IPC$
* share as the anonymous user. If we try to chdir as that user we will
* fail.... WTF ? JRA.
*/
if (vfs_ChDir(conn,conn->connectpath) != 0) {
DEBUG(3,("create_conn_struct: Can't ChDir to new conn path %s. Error was %s\n",
conn->connectpath, strerror(errno) ));
conn_free_internal(conn);
return False;
}
return True;
}
/**********************************************************************
Parse the contents of a symlink to verify if it is an msdfs referral
A valid referral is of the form: msdfs:server1\share1,server2\share2
talloc CTX can be NULL here if preflist and refcount pointers are null.
**********************************************************************/
static BOOL parse_symlink(TALLOC_CTX *ctx, char *buf, struct referral **preflist, int *refcount)
{
pstring temp;
char *prot;
char *alt_path[MAX_REFERRAL_COUNT];
int count = 0, i;
struct referral *reflist;
pstrcpy(temp,buf);
prot = strtok(temp,":");
if (!strequal(prot, "msdfs")) {
return False;
}
/* No referral list requested. Just yes/no. */
if (!preflist) {
return True;
}
if (!ctx) {
DEBUG(0,("parse_symlink: logic error. TALLOC_CTX should not be null.\n"));
return True;
}
/* parse out the alternate paths */
while((count<MAX_REFERRAL_COUNT) &&
((alt_path[count] = strtok(NULL,",")) != NULL)) {
count++;
}
DEBUG(10,("parse_symlink: count=%d\n", count));
reflist = *preflist = TALLOC_ARRAY(ctx, struct referral, count);
if(reflist == NULL) {
DEBUG(0,("parse_symlink: talloc failed!\n"));
return False;
}
for(i=0;i<count;i++) {
char *p;
/* replace all /'s in the alternate path by a \ */
for(p = alt_path[i]; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
*p = '\\';
}
/* Remove leading '\\'s */
p = alt_path[i];
while (*p && (*p == '\\')) {
p++;
}
pstrcpy(reflist[i].alternate_path, "\\");
pstrcat(reflist[i].alternate_path, p);
reflist[i].proximity = 0;
reflist[i].ttl = REFERRAL_TTL;
DEBUG(10, ("parse_symlink: Created alt path: %s\n", reflist[i].alternate_path));
}
if(refcount) {
*refcount = count;
}
return True;
}
/**********************************************************************
Returns true if the unix path is a valid msdfs symlink
talloc CTX can be NULL here if reflistp and refcnt pointers are null.
**********************************************************************/
BOOL is_msdfs_link(TALLOC_CTX *ctx, connection_struct *conn, char *path,
struct referral **reflistp, int *refcnt,
SMB_STRUCT_STAT *sbufp)
{
SMB_STRUCT_STAT st;
pstring referral;
int referral_len = 0;
if (!path || !conn) {
return False;
}
if (sbufp == NULL) {
sbufp = &st;
}
if (SMB_VFS_LSTAT(conn, path, sbufp) != 0) {
DEBUG(5,("is_msdfs_link: %s does not exist.\n",path));
return False;
}
if (S_ISLNK(sbufp->st_mode)) {
/* open the link and read it */
referral_len = SMB_VFS_READLINK(conn, path, referral, sizeof(pstring)-1);
if (referral_len == -1) {
DEBUG(0,("is_msdfs_link: Error reading msdfs link %s: %s\n", path, strerror(errno)));
return False;
}
referral[referral_len] = '\0';
DEBUG(5,("is_msdfs_link: %s -> %s\n",path,referral));
if (parse_symlink(ctx, referral, reflistp, refcnt)) {
return True;
}
}
return False;
}
/*****************************************************************
Used by other functions to decide if a dfs path is remote,
and to get the list of referred locations for that remote path.
findfirst_flag: For findfirsts, dfs links themselves are not
redirected, but paths beyond the links are. For normal smb calls,
even dfs links need to be redirected.
self_referralp: clients expect a dfs referral for the same share when
they request referrals for dfs roots on a server.
consumedcntp: how much of the dfs path is being redirected. the client
should try the remaining path on the redirected server.
TALLOC_CTX can be NULL here if struct referral **reflistpp, int *refcntp
are also NULL.
*****************************************************************/
static BOOL resolve_dfs_path(TALLOC_CTX *ctx, pstring dfspath, struct dfs_path *dp,
connection_struct *conn, BOOL search_flag,
struct referral **reflistpp, int *refcntp,
BOOL *self_referralp, int *consumedcntp)
{
pstring localpath;
int consumed_level = 1;
char *p;
BOOL bad_path = False;
SMB_STRUCT_STAT sbuf;
pstring reqpath;
if (!dp || !conn) {
DEBUG(1,("resolve_dfs_path: NULL dfs_path* or NULL connection_struct*!\n"));
return False;
}
if (!ctx && (reflistpp || refcntp)) {
DEBUG(0,("resolve_dfs_path: logic error. TALLOC_CTX must not be NULL.\n"));
}
if (dp->reqpath[0] == '\0') {
if (self_referralp) {
DEBUG(6,("resolve_dfs_path: self-referral. returning False\n"));
*self_referralp = True;
}
return False;
}
DEBUG(10,("resolve_dfs_path: Conn path = %s req_path = %s\n", conn->connectpath, dp->reqpath));
unix_convert(dp->reqpath,conn,0,&bad_path,&sbuf);
/* JRA... should we strlower the last component here.... ? */
pstrcpy(localpath, dp->reqpath);
/* check if need to redirect */
if (is_msdfs_link(ctx, conn, localpath, reflistpp, refcntp, NULL)) {
if ( search_flag ) {
DEBUG(6,("resolve_dfs_path (FindFirst) No redirection "
"for dfs link %s.\n", dfspath));
return False;
}
DEBUG(6,("resolve_dfs_path: %s resolves to a valid Dfs link.\n", dfspath));
if (consumedcntp) {
*consumedcntp = strlen(dfspath);
}
return True;
}
/* redirect if any component in the path is a link */
pstrcpy(reqpath, dp->reqpath);
p = strrchr_m(reqpath, '/');
while (p) {
*p = '\0';
pstrcpy(localpath, reqpath);
if (is_msdfs_link(ctx, conn, localpath, reflistpp, refcntp, NULL)) {
DEBUG(4, ("resolve_dfs_path: Redirecting %s because parent %s is dfs link\n", dfspath, localpath));
/* To find the path consumed, we truncate the original
DFS pathname passed to use to remove the last
component. The length of the resulting string is
the path consumed
*/
if (consumedcntp) {
char *q;
pstring buf;
pstrcpy(buf, dfspath);
trim_char(buf, '\0', '\\');
for (; consumed_level; consumed_level--) {
q = strrchr_m(buf, '\\');
if (q) {
*q = 0;
}
}
*consumedcntp = strlen(buf);
DEBUG(10, ("resolve_dfs_path: Path consumed: %s (%d)\n", buf, *consumedcntp));
}
return True;
}
p = strrchr_m(reqpath, '/');
consumed_level++;
}
return False;
}
/*****************************************************************
Decides if a dfs pathname should be redirected or not.
If not, the pathname is converted to a tcon-relative local unix path
search_wcard_flag: this flag performs 2 functions bother related
to searches. See resolve_dfs_path() and parse_processed_dfs_path()
for details.
*****************************************************************/
BOOL dfs_redirect( pstring pathname, connection_struct *conn, BOOL search_wcard_flag )
{
struct dfs_path dp;
if (!conn || !pathname) {
return False;
}
parse_processed_dfs_path(pathname, &dp, search_wcard_flag);
/* if dfs pathname for a non-dfs share, convert to tcon-relative
path and return false */
if (!lp_msdfs_root(SNUM(conn))) {
pstrcpy(pathname, dp.reqpath);
return False;
}
if ( !( strequal(dp.servicename, lp_servicename(SNUM(conn)))
|| ( strequal(dp.servicename, HOMES_NAME)
&& strequal(lp_servicename(SNUM(conn)), get_current_username()) )) )
{
return False;
}
if (resolve_dfs_path(NULL, pathname, &dp, conn, search_wcard_flag,
NULL, NULL, NULL, NULL)) {
DEBUG(3,("dfs_redirect: Redirecting %s\n", pathname));
return True;
} else {
DEBUG(3,("dfs_redirect: Not redirecting %s.\n", pathname));
/* Form non-dfs tcon-relative path */
pstrcpy(pathname, dp.reqpath);
DEBUG(3,("dfs_redirect: Path converted to non-dfs path %s\n", pathname));
return False;
}
/* never reached */
}
/**********************************************************************
Return a self referral.
**********************************************************************/
static BOOL self_ref(TALLOC_CTX *ctx, char *pathname, struct junction_map *jucn,
int *consumedcntp, BOOL *self_referralp)
{
struct referral *ref;
if (self_referralp != NULL) {
*self_referralp = True;
}
jucn->referral_count = 1;
if((ref = TALLOC_P(ctx, struct referral)) == NULL) {
DEBUG(0,("self_ref: malloc failed for referral\n"));
return False;
}
pstrcpy(ref->alternate_path,pathname);
ref->proximity = 0;
ref->ttl = REFERRAL_TTL;
jucn->referral_list = ref;
if (consumedcntp) {
*consumedcntp = strlen(pathname);
}
return True;
}
/**********************************************************************
Gets valid referrals for a dfs path and fills up the
junction_map structure.
**********************************************************************/
BOOL get_referred_path(TALLOC_CTX *ctx, char *pathname, struct junction_map *jucn,
int *consumedcntp, BOOL *self_referralp)
{
struct dfs_path dp;
struct connection_struct conns;
struct connection_struct *conn = &conns;
pstring conn_path;
int snum;
BOOL ret = False;
BOOL self_referral = False;
if (!pathname || !jucn) {
return False;
}
ZERO_STRUCT(conns);
if (self_referralp) {
*self_referralp = False;
} else {
self_referralp = &self_referral;
}
parse_dfs_path(pathname, &dp);
/* Verify hostname in path */
if ( !strequal(get_local_machine_name(), dp.hostname) ) {
/* Hostname mismatch, check if one of our IP addresses */
if (!ismyip(*interpret_addr2(dp.hostname))) {
DEBUG(3, ("get_referred_path: Invalid hostname %s in path %s\n",
dp.hostname, pathname));
return False;
}
}
pstrcpy(jucn->service_name, dp.servicename);
pstrcpy(jucn->volume_name, dp.reqpath);
/* Verify the share is a dfs root */
snum = lp_servicenumber(jucn->service_name);
if(snum < 0) {
if ((snum = find_service(jucn->service_name)) < 0) {
return False;
}
}
if (!lp_msdfs_root(snum)) {
DEBUG(3,("get_referred_path: .%s. in dfs path %s is not a dfs root.\n",
dp.servicename, pathname));
goto out;
}
/*
* Self referrals are tested with a anonymous IPC connection and
* a GET_DFS_REFERRAL call to \\server\share. (which means dp.reqpath[0] points
* to an empty string). create_conn_struct cd's into the directory and will
* fail if it cannot (as the anonymous user). Cope with this.
*/
if (dp.reqpath[0] == '\0') {
struct referral* ref;
if (*lp_msdfs_proxy(snum) == '\0') {
return self_ref(ctx, pathname, jucn, consumedcntp, self_referralp);
}
jucn->referral_count = 1;
if ((ref = TALLOC_P(ctx, struct referral)) == NULL) {
DEBUG(0, ("malloc failed for referral\n"));
goto out;
}
pstrcpy(ref->alternate_path, lp_msdfs_proxy(snum));
if (dp.reqpath[0] != '\0') {
pstrcat(ref->alternate_path, dp.reqpath);
}
ref->proximity = 0;
ref->ttl = REFERRAL_TTL;
jucn->referral_list = ref;
if (consumedcntp) {
*consumedcntp = strlen(pathname);
}
ret = True;
goto out;
}
pstrcpy(conn_path, lp_pathname(snum));
if (!create_conn_struct(conn, snum, conn_path)) {
return False;
}
/* If not remote & not a self referral, return False */
if (!resolve_dfs_path(ctx, pathname, &dp, conn, False,
&jucn->referral_list, &jucn->referral_count,
self_referralp, consumedcntp)) {
if (!*self_referralp) {
DEBUG(3,("get_referred_path: No valid referrals for path %s\n", pathname));
goto out;
}
}
/* if self_referral, fill up the junction map */
if (*self_referralp) {
if (self_ref(ctx, pathname, jucn, consumedcntp, self_referralp) == False) {
goto out;
}
}
ret = True;
out:
conn_free_internal(conn);
return ret;
}
static int setup_ver2_dfs_referral(char *pathname, char **ppdata,
struct junction_map *junction,
int consumedcnt,
BOOL self_referral)
{
char* pdata = *ppdata;
unsigned char uni_requestedpath[1024];
int uni_reqpathoffset1,uni_reqpathoffset2;
int uni_curroffset;
int requestedpathlen=0;
int offset;
int reply_size = 0;
int i=0;
DEBUG(10,("setting up version2 referral\nRequested path:\n"));
requestedpathlen = rpcstr_push(uni_requestedpath, pathname, sizeof(pstring),
STR_TERMINATE);
if (DEBUGLVL(10)) {
dump_data(0, (const char *) uni_requestedpath,requestedpathlen);
}
DEBUG(10,("ref count = %u\n",junction->referral_count));
uni_reqpathoffset1 = REFERRAL_HEADER_SIZE +
VERSION2_REFERRAL_SIZE * junction->referral_count;
uni_reqpathoffset2 = uni_reqpathoffset1 + requestedpathlen;
uni_curroffset = uni_reqpathoffset2 + requestedpathlen;
reply_size = REFERRAL_HEADER_SIZE + VERSION2_REFERRAL_SIZE*junction->referral_count +
2 * requestedpathlen;
DEBUG(10,("reply_size: %u\n",reply_size));
/* add up the unicode lengths of all the referral paths */
for(i=0;i<junction->referral_count;i++) {
DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
}
DEBUG(10,("reply_size = %u\n",reply_size));
/* add the unexplained 0x16 bytes */
reply_size += 0x16;
pdata = (char *)SMB_REALLOC(pdata,reply_size);
if(pdata == NULL) {
DEBUG(0,("malloc failed for Realloc!\n"));
return -1;
}
*ppdata = pdata;
/* copy in the dfs requested paths.. required for offset calculations */
memcpy(pdata+uni_reqpathoffset1,uni_requestedpath,requestedpathlen);
memcpy(pdata+uni_reqpathoffset2,uni_requestedpath,requestedpathlen);
/* create the header */
SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
SSVAL(pdata,2,junction->referral_count); /* number of referral in this pkt */
if(self_referral) {
SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER);
} else {
SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
}
offset = 8;
/* add the referral elements */
for(i=0;i<junction->referral_count;i++) {
struct referral* ref = &junction->referral_list[i];
int unilen;
SSVAL(pdata,offset,2); /* version 2 */
SSVAL(pdata,offset+2,VERSION2_REFERRAL_SIZE);
if(self_referral) {
SSVAL(pdata,offset+4,1);
} else {
SSVAL(pdata,offset+4,0);
}
SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
SIVAL(pdata,offset+8,ref->proximity);
SIVAL(pdata,offset+12,ref->ttl);
SSVAL(pdata,offset+16,uni_reqpathoffset1-offset);
SSVAL(pdata,offset+18,uni_reqpathoffset2-offset);
/* copy referred path into current offset */
unilen = rpcstr_push(pdata+uni_curroffset, ref->alternate_path,
sizeof(pstring), STR_UNICODE);
SSVAL(pdata,offset+20,uni_curroffset-offset);
uni_curroffset += unilen;
offset += VERSION2_REFERRAL_SIZE;
}
/* add in the unexplained 22 (0x16) bytes at the end */
memset(pdata+uni_curroffset,'\0',0x16);
return reply_size;
}
static int setup_ver3_dfs_referral(char *pathname, char **ppdata,
struct junction_map *junction,
int consumedcnt,
BOOL self_referral)
{
char* pdata = *ppdata;
unsigned char uni_reqpath[1024];
int uni_reqpathoffset1, uni_reqpathoffset2;
int uni_curroffset;
int reply_size = 0;
int reqpathlen = 0;
int offset,i=0;
DEBUG(10,("setting up version3 referral\n"));
reqpathlen = rpcstr_push(uni_reqpath, pathname, sizeof(pstring), STR_TERMINATE);
if (DEBUGLVL(10)) {
dump_data(0, (char *) uni_reqpath,reqpathlen);
}
uni_reqpathoffset1 = REFERRAL_HEADER_SIZE + VERSION3_REFERRAL_SIZE * junction->referral_count;
uni_reqpathoffset2 = uni_reqpathoffset1 + reqpathlen;
reply_size = uni_curroffset = uni_reqpathoffset2 + reqpathlen;
for(i=0;i<junction->referral_count;i++) {
DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
}
pdata = (char *)SMB_REALLOC(pdata,reply_size);
if(pdata == NULL) {
DEBUG(0,("version3 referral setup: malloc failed for Realloc!\n"));
return -1;
}
*ppdata = pdata;
/* create the header */
SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
SSVAL(pdata,2,junction->referral_count); /* number of referral */
if(self_referral) {
SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER);
} else {
SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
}
/* copy in the reqpaths */
memcpy(pdata+uni_reqpathoffset1,uni_reqpath,reqpathlen);
memcpy(pdata+uni_reqpathoffset2,uni_reqpath,reqpathlen);
offset = 8;
for(i=0;i<junction->referral_count;i++) {
struct referral* ref = &(junction->referral_list[i]);
int unilen;
SSVAL(pdata,offset,3); /* version 3 */
SSVAL(pdata,offset+2,VERSION3_REFERRAL_SIZE);
if(self_referral) {
SSVAL(pdata,offset+4,1);
} else {
SSVAL(pdata,offset+4,0);
}
SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
SIVAL(pdata,offset+8,ref->ttl);
SSVAL(pdata,offset+12,uni_reqpathoffset1-offset);
SSVAL(pdata,offset+14,uni_reqpathoffset2-offset);
/* copy referred path into current offset */
unilen = rpcstr_push(pdata+uni_curroffset,ref->alternate_path,
sizeof(pstring), STR_UNICODE | STR_TERMINATE);
SSVAL(pdata,offset+16,uni_curroffset-offset);
/* copy 0x10 bytes of 00's in the ServiceSite GUID */
memset(pdata+offset+18,'\0',16);
uni_curroffset += unilen;
offset += VERSION3_REFERRAL_SIZE;
}
return reply_size;
}
/******************************************************************
Set up the Dfs referral for the dfs pathname
******************************************************************/
int setup_dfs_referral(connection_struct *orig_conn, char *pathname, int max_referral_level, char **ppdata)
{
struct junction_map junction;
int consumedcnt;
BOOL self_referral = False;
pstring buf;
int reply_size = 0;
char *pathnamep = pathname;
TALLOC_CTX *ctx;
if (!(ctx=talloc_init("setup_dfs_referral"))) {
return -1;
}
ZERO_STRUCT(junction);
/* get the junction entry */
if (!pathnamep) {
talloc_destroy(ctx);
return -1;
}
/* Trim pathname sent by client so it begins with only one backslash.
Two backslashes confuse some dfs clients
*/
while (pathnamep[0] == '\\' && pathnamep[1] == '\\') {
pathnamep++;
}
pstrcpy(buf, pathnamep);
/* The following call can change cwd. */
if (!get_referred_path(ctx, buf, &junction, &consumedcnt, &self_referral)) {
vfs_ChDir(orig_conn,orig_conn->connectpath);
talloc_destroy(ctx);
return -1;
}
vfs_ChDir(orig_conn,orig_conn->connectpath);
if (!self_referral) {
pathnamep[consumedcnt] = '\0';
if( DEBUGLVL( 3 ) ) {
int i=0;
dbgtext("setup_dfs_referral: Path %s to alternate path(s):",pathnamep);
for(i=0;i<junction.referral_count;i++)
dbgtext(" %s",junction.referral_list[i].alternate_path);
dbgtext(".\n");
}
}
/* create the referral depeding on version */
DEBUG(10,("max_referral_level :%d\n",max_referral_level));
if(max_referral_level<2 || max_referral_level>3) {
max_referral_level = 2;
}
switch(max_referral_level) {
case 2:
reply_size = setup_ver2_dfs_referral(pathnamep, ppdata, &junction,
consumedcnt, self_referral);
break;
case 3:
reply_size = setup_ver3_dfs_referral(pathnamep, ppdata, &junction,
consumedcnt, self_referral);
break;
default:
DEBUG(0,("setup_dfs_referral: Invalid dfs referral version: %d\n", max_referral_level));
talloc_destroy(ctx);
return -1;
}
if (DEBUGLVL(10)) {
DEBUGADD(0,("DFS Referral pdata:\n"));
dump_data(0,*ppdata,reply_size);
}
talloc_destroy(ctx);
return reply_size;
}
/**********************************************************************
The following functions are called by the NETDFS RPC pipe functions
**********************************************************************/
/*********************************************************************
Creates a junction structure from a Dfs pathname
**********************************************************************/
BOOL create_junction(char *pathname, struct junction_map *jucn)
{
struct dfs_path dp;
parse_dfs_path(pathname,&dp);
/* check if path is dfs : validate first token */
if ( !strequal(get_local_machine_name(),dp.hostname) ) {
/* Hostname mismatch, check if one of our IP addresses */
if (!ismyip(*interpret_addr2(dp.hostname))) {
DEBUG(4,("create_junction: Invalid hostname %s in dfs path %s\n",
dp.hostname, pathname));
return False;
}
}
/* Check for a non-DFS share */
if(!lp_msdfs_root(lp_servicenumber(dp.servicename))) {
DEBUG(4,("create_junction: %s is not an msdfs root.\n", dp.servicename));
return False;
}
pstrcpy(jucn->service_name,dp.servicename);
pstrcpy(jucn->volume_name,dp.reqpath);
return True;
}
/**********************************************************************
Forms a valid Unix pathname from the junction
**********************************************************************/
static BOOL junction_to_local_path(struct junction_map *jucn, char *path,
int max_pathlen, connection_struct *conn)
{
int snum;
pstring conn_path;
if(!path || !jucn) {
return False;
}
snum = lp_servicenumber(jucn->service_name);
if(snum < 0) {
return False;
}
safe_strcpy(path, lp_pathname(snum), max_pathlen-1);
safe_strcat(path, "/", max_pathlen-1);
safe_strcat(path, jucn->volume_name, max_pathlen-1);
pstrcpy(conn_path, lp_pathname(snum));
if (!create_conn_struct(conn, snum, conn_path)) {
return False;
}
return True;
}
BOOL create_msdfs_link(struct junction_map *jucn, BOOL exists)
{
pstring path;
pstring msdfs_link;
connection_struct conns;
connection_struct *conn = &conns;
int i=0;
BOOL insert_comma = False;
BOOL ret = False;
ZERO_STRUCT(conns);
if(!junction_to_local_path(jucn, path, sizeof(path), conn)) {
return False;
}
/* form the msdfs_link contents */
pstrcpy(msdfs_link, "msdfs:");
for(i=0; i<jucn->referral_count; i++) {
char* refpath = jucn->referral_list[i].alternate_path;
trim_char(refpath, '\\', '\\');
if(*refpath == '\0') {
if (i == 0) {
insert_comma = False;
}
continue;
}
if (i > 0 && insert_comma) {
pstrcat(msdfs_link, ",");
}
pstrcat(msdfs_link, refpath);
if (!insert_comma) {
insert_comma = True;
}
}
DEBUG(5,("create_msdfs_link: Creating new msdfs link: %s -> %s\n", path, msdfs_link));
if(exists) {
if(SMB_VFS_UNLINK(conn,path)!=0) {
goto out;
}
}
if(SMB_VFS_SYMLINK(conn, msdfs_link, path) < 0) {
DEBUG(1,("create_msdfs_link: symlink failed %s -> %s\nError: %s\n",
path, msdfs_link, strerror(errno)));
goto out;
}
ret = True;
out:
conn_free_internal(conn);
return ret;
}
BOOL remove_msdfs_link(struct junction_map *jucn)
{
pstring path;
connection_struct conns;
connection_struct *conn = &conns;
BOOL ret = False;
ZERO_STRUCT(conns);
if( junction_to_local_path(jucn, path, sizeof(path), conn) ) {
if( SMB_VFS_UNLINK(conn, path) == 0 ) {
ret = True;
}
talloc_destroy( conn->mem_ctx );
}
conn_free_internal(conn);
return ret;
}
static int form_junctions(TALLOC_CTX *ctx, int snum, struct junction_map *jucn, int jn_remain)
{
int cnt = 0;
SMB_STRUCT_DIR *dirp;
char* dname;
pstring connect_path;
char* service_name = lp_servicename(snum);
connection_struct conn;
struct referral *ref = NULL;
ZERO_STRUCT(conn);
if (jn_remain <= 0) {
return 0;
}
pstrcpy(connect_path,lp_pathname(snum));
if(*connect_path == '\0') {
return 0;
}
/*
* Fake up a connection struct for the VFS layer.
*/
if (!create_conn_struct(&conn, snum, connect_path)) {
return 0;
}
/* form a junction for the msdfs root - convention
DO NOT REMOVE THIS: NT clients will not work with us
if this is not present
*/
pstrcpy(jucn[cnt].service_name, service_name);
jucn[cnt].volume_name[0] = '\0';
jucn[cnt].referral_count = 1;
ref = jucn[cnt].referral_list = TALLOC_P(ctx, struct referral);
if (jucn[cnt].referral_list == NULL) {
DEBUG(0, ("Malloc failed!\n"));
goto out;
}
ref->proximity = 0;
ref->ttl = REFERRAL_TTL;
if (*lp_msdfs_proxy(snum) != '\0') {
pstrcpy(ref->alternate_path, lp_msdfs_proxy(snum));
cnt++;
goto out;
}
slprintf(ref->alternate_path, sizeof(pstring)-1,
"\\\\%s\\%s", get_local_machine_name(), service_name);
cnt++;
/* Now enumerate all dfs links */
dirp = SMB_VFS_OPENDIR(&conn, ".", NULL, 0);
if(!dirp) {
goto out;
}
while ((dname = vfs_readdirname(&conn, dirp)) != NULL) {
if (cnt >= jn_remain) {
SMB_VFS_CLOSEDIR(&conn,dirp);
DEBUG(2, ("ran out of MSDFS junction slots"));
goto out;
}
if (is_msdfs_link(ctx, &conn, dname, &jucn[cnt].referral_list,
&jucn[cnt].referral_count, NULL)) {
pstrcpy(jucn[cnt].service_name, service_name);
pstrcpy(jucn[cnt].volume_name, dname);
cnt++;
}
}
SMB_VFS_CLOSEDIR(&conn,dirp);
out:
conn_free_internal(&conn);
return cnt;
}
int enum_msdfs_links(TALLOC_CTX *ctx, struct junction_map *jucn, int jn_max)
{
int i=0;
int sharecount = 0;
int jn_count = 0;
if(!lp_host_msdfs()) {
return 0;
}
/* Ensure all the usershares are loaded. */
become_root();
sharecount = load_usershare_shares();
unbecome_root();
for(i=0;i < sharecount && (jn_max - jn_count) > 0;i++) {
if(lp_msdfs_root(i)) {
jn_count += form_junctions(ctx, i,jucn,jn_max - jn_count);
}
}
return jn_count;
}
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