2 Copyright (C) Andrew Tridgell 1996
3 Copyright (C) Paul Mackerras 1996
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /* handle the mapping of uid/gid and user/group names between systems.
21 If the source username/group does not exist on the target then use
22 the numeric ids. Never do any mapping for uid=0 or gid=0 as these
28 extern int preserve_uid
;
29 extern int preserve_gid
;
30 extern int numeric_ids
;
39 static struct idlist
*uidlist
;
40 static struct idlist
*gidlist
;
42 static struct idlist
*add_list(int id
, char *name
)
44 struct idlist
*list
= (struct idlist
*)malloc(sizeof(list
[0]));
45 if (!list
) out_of_memory("add_list");
47 list
->name
= strdup(name
);
48 if (!list
->name
) out_of_memory("add_list");
55 /* turn a uid into a user name */
56 static char *uid_to_name(uid_t uid
)
58 struct passwd
*pass
= getpwuid(uid
);
59 if (pass
) return(pass
->pw_name
);
63 /* turn a gid into a group name */
64 static char *gid_to_name(gid_t gid
)
66 struct group
*grp
= getgrgid(gid
);
67 if (grp
) return(grp
->gr_name
);
71 static int map_uid(int id
, char *name
)
74 if (name_to_uid(name
, &uid
) && uid
!= 0)
79 static int map_gid(int id
, char *name
)
82 if (name_to_gid(name
, &gid
) && gid
!= 0)
87 /* this function is a definate candidate for a faster algorithm */
88 static uid_t
match_uid(uid_t uid
)
90 static uid_t last_in
, last_out
;
91 struct idlist
*list
= uidlist
;
93 if (uid
== last_in
) return last_out
;
98 if (list
->id
== (int)uid
) {
99 last_out
= (uid_t
)list
->id2
;
109 static gid_t
match_gid(gid_t gid
)
111 static gid_t last_in
, last_out
;
112 struct idlist
*list
= gidlist
;
114 if (gid
== last_in
) return last_out
;
119 if (list
->id
== (int)gid
) {
120 last_out
= (gid_t
)list
->id2
;
129 last_out
= (gid_t
) -1;
133 /* add a uid to the list of uids */
134 void add_uid(uid_t uid
)
136 struct idlist
*list
= uidlist
;
139 if (numeric_ids
) return;
145 if (!(name
= uid_to_name(uid
))) return;
146 uidlist
= add_list((int)uid
, name
);
151 if (list
->id
== (int)uid
) return;
155 if (list
->id
== (int)uid
) return;
157 if (!(name
= uid_to_name(uid
))) return;
159 list
->next
= add_list((int)uid
, name
);
162 /* add a gid to the list of gids */
163 void add_gid(gid_t gid
)
165 struct idlist
*list
= gidlist
;
168 if (numeric_ids
) return;
174 if (!(name
= gid_to_name(gid
))) return;
175 gidlist
= add_list((int)gid
, name
);
180 if (list
->id
== (int)gid
) return;
184 if (list
->id
== (int)gid
) return;
186 if (!(name
= gid_to_name(gid
))) return;
188 list
->next
= add_list((int)gid
, name
);
192 /* send a complete uid/gid mapping to the peer */
193 void send_uid_list(int f
)
197 if (numeric_ids
) return;
200 /* we send sequences of uid/byte-length/name */
203 int len
= strlen(list
->name
);
204 write_int(f
, list
->id
);
206 write_buf(f
, list
->name
, len
);
210 /* terminate the uid list with a 0 uid. We explicitly exclude
218 int len
= strlen(list
->name
);
219 write_int(f
, list
->id
);
221 write_buf(f
, list
->name
, len
);
228 /* recv a complete uid/gid mapping from the peer and map the uid/gid
229 in the file list to local names */
230 void recv_uid_list(int f
, struct file_list
*flist
)
236 if (numeric_ids
) return;
239 /* read the uid list */
243 int len
= read_byte(f
);
244 name
= (char *)malloc(len
+1);
245 if (!name
) out_of_memory("recv_uid_list");
246 read_sbuf(f
, name
, len
);
248 uidlist
= add_list(id
, name
);
251 list
->next
= add_list(id
, name
);
254 list
->id2
= map_uid(id
, name
);
262 /* and the gid list */
266 int len
= read_byte(f
);
267 name
= (char *)malloc(len
+1);
268 if (!name
) out_of_memory("recv_uid_list");
269 read_sbuf(f
, name
, len
);
271 gidlist
= add_list(id
, name
);
274 list
->next
= add_list(id
, name
);
277 list
->id2
= map_gid(id
, name
);
283 if (!(am_root
&& preserve_uid
) && !preserve_gid
) return;
285 /* now convert the uid/gid of all files in the list to the mapped
287 for (i
=0;i
<flist
->count
;i
++) {
288 if (am_root
&& preserve_uid
&& flist
->files
[i
]->uid
!= 0) {
289 flist
->files
[i
]->uid
= match_uid(flist
->files
[i
]->uid
);
291 if (preserve_gid
&& flist
->files
[i
]->gid
!= 0) {
292 flist
->files
[i
]->gid
= match_gid(flist
->files
[i
]->gid
);