-/*
- Copyright (C) Andrew Tridgell 1996
- Copyright (C) Paul Mackerras 1996
-
- 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.
-*/
-
-/* handle the mapping of uid/gid and user/group names between systems.
- If the source username/group does not exist on the target then use
- the numeric ids. Never do any mapping for uid=0 or gid=0 as these
- are special.
-*/
+/*
+ * Handle the mapping of uid/gid and user/group names between systems.
+ *
+ * Copyright (C) 1996 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2004-2007 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* If the source username/group does not exist on the target then use
+ * the numeric IDs. Never do any mapping for uid=0 or gid=0 as these
+ * are special. */
#include "rsync.h"
+#ifdef HAVE_GETGROUPS
+# ifndef GETGROUPS_T
+# define GETGROUPS_T gid_t
+# endif
+#endif
+
+extern int verbose;
+extern int am_root;
extern int preserve_uid;
extern int preserve_gid;
+extern int preserve_acls;
extern int numeric_ids;
-extern int am_root;
struct idlist {
struct idlist *next;
static struct idlist *uidlist;
static struct idlist *gidlist;
-static struct idlist *add_list(int id, char *name)
+static struct idlist *add_to_list(struct idlist **root, int id, char *name,
+ int id2)
{
- struct idlist *list = new(struct idlist);
- if (!list) out_of_memory("add_list");
- list->next = NULL;
- list->name = strdup(name);
- if (!list->name) out_of_memory("add_list");
- list->id = (int)id;
- return list;
+ struct idlist *node = new(struct idlist);
+ if (!node)
+ out_of_memory("add_to_list");
+ node->next = *root;
+ node->name = name;
+ node->id = id;
+ node->id2 = id2;
+ *root = node;
+ return node;
}
-
-
/* turn a uid into a user name */
static char *uid_to_name(uid_t uid)
{
struct passwd *pass = getpwuid(uid);
- if (pass) return(pass->pw_name);
+ if (pass)
+ return strdup(pass->pw_name);
return NULL;
}
static char *gid_to_name(gid_t gid)
{
struct group *grp = getgrgid(gid);
- if (grp) return(grp->gr_name);
+ if (grp)
+ return strdup(grp->gr_name);
return NULL;
}
-static int map_uid(int id, char *name)
+static uid_t map_uid(uid_t id, char *name)
{
uid_t uid;
- if (name_to_uid(name, &uid) && uid != 0)
+ if (id != 0 && name_to_uid(name, &uid))
return uid;
return id;
}
-static int map_gid(int id, char *name)
+static gid_t map_gid(gid_t id, char *name)
{
gid_t gid;
- if (name_to_gid(name, &gid) && gid != 0)
+ if (id != 0 && name_to_gid(name, &gid))
return gid;
return id;
}
-/* this function is a definate candidate for a faster algorithm */
-static uid_t match_uid(uid_t uid)
-{
- static uid_t last_in, last_out;
- struct idlist *list = uidlist;
-
- if (uid == last_in) return last_out;
-
- last_in = uid;
-
- while (list) {
- if (list->id == (int)uid) {
- last_out = (uid_t)list->id2;
- return last_out;
- }
- list = list->next;
- }
-
- last_out = uid;
- return last_out;
-}
-
static int is_in_group(gid_t gid)
{
-#ifdef GETGROUPS_T
- static gid_t last_in = (gid_t) -2, last_out;
+#ifdef HAVE_GETGROUPS
+ static gid_t last_in = GID_NONE, last_out;
static int ngroups = -2;
static GETGROUPS_T *gidset;
int n;
if (gid == last_in)
return last_out;
if (ngroups < -1) {
- /* treat failure (-1) as if not member of any group */
- ngroups = getgroups(0, 0);
- if (ngroups > 0) {
- gidset = new_array(GETGROUPS_T, ngroups);
+ gid_t mygid = MY_GID();
+ if ((ngroups = getgroups(0, NULL)) < 0)
+ ngroups = 0;
+ gidset = new_array(GETGROUPS_T, ngroups+1);
+ if (!gidset)
+ out_of_memory("is_in_group");
+ if (ngroups > 0)
ngroups = getgroups(ngroups, gidset);
+ /* The default gid might not be in the list on some systems. */
+ for (n = 0; n < ngroups; n++) {
+ if (gidset[n] == mygid)
+ break;
+ }
+ if (n == ngroups)
+ gidset[ngroups++] = mygid;
+ if (verbose > 3) {
+ int pos;
+ char *gidbuf = new_array(char, ngroups*21+32);
+ if (!gidbuf)
+ out_of_memory("is_in_group");
+ pos = snprintf(gidbuf, 32, "process has %d gid%s: ",
+ ngroups, ngroups == 1? "" : "s");
+ for (n = 0; n < ngroups; n++) {
+ pos += snprintf(gidbuf+pos, 21, " %d", (int)gidset[n]);
+ }
+ rprintf(FINFO, "%s\n", gidbuf);
+ free(gidbuf);
}
}
last_in = gid;
- last_out = 0;
for (n = 0; n < ngroups; n++) {
- if (gidset[n] == gid) {
- last_out = 1;
- break;
- }
+ if (gidset[n] == gid)
+ return last_out = 1;
}
- return last_out;
+ return last_out = 0;
#else
- return 0;
+ static gid_t mygid = GID_NONE;
+ if (mygid == GID_NONE) {
+ mygid = MY_GID();
+ if (verbose > 3)
+ rprintf(FINFO, "process has gid %d\n", (int)mygid);
+ }
+ return gid == mygid;
#endif
}
-static gid_t match_gid(gid_t gid)
+/* Add a uid to the list of uids. Only called on receiving side. */
+static uid_t recv_add_uid(uid_t id, char *name)
{
- static gid_t last_in, last_out;
- struct idlist *list = gidlist;
-
- if (gid == last_in) return last_out;
+ uid_t id2 = name ? map_uid(id, name) : id;
+ struct idlist *node;
- last_in = gid;
+ node = add_to_list(&uidlist, (int)id, name, (int)id2);
- while (list) {
- if (list->id == (int)gid) {
- last_out = (gid_t)list->id2;
- return last_out;
- }
- list = list->next;
+ if (verbose > 3) {
+ rprintf(FINFO, "uid %d(%s) maps to %d\n",
+ (int)id, name ? name : "", (int)id2);
}
-
- if (am_root)
- last_out = gid;
- else
- last_out = GID_NONE;
- return last_out;
+
+ return id2;
}
-/* add a uid to the list of uids */
-void add_uid(uid_t uid)
+/* Add a gid to the list of gids. Only called on receiving side. */
+static gid_t recv_add_gid(gid_t id, char *name)
{
- struct idlist *list = uidlist;
- char *name;
-
- if (numeric_ids) return;
+ gid_t id2 = name ? map_gid(id, name) : id;
+ struct idlist *node;
- /* don't map root */
- if (uid==0) return;
+ if (!am_root && !is_in_group(id2))
+ id2 = GID_NONE;
+ node = add_to_list(&gidlist, (int)id, name, (int)id2);
- if (!list) {
- if (!(name = uid_to_name(uid))) return;
- uidlist = add_list((int)uid, name);
- return;
+ if (verbose > 3) {
+ rprintf(FINFO, "gid %d(%s) maps to %d\n",
+ (int)id, name ? name : "", (int)id2);
}
- while (list->next) {
- if (list->id == (int)uid) return;
- list = list->next;
- }
+ return id2;
+}
- if (list->id == (int)uid) return;
+/* this function is a definate candidate for a faster algorithm */
+uid_t match_uid(uid_t uid)
+{
+ static uid_t last_in, last_out;
+ struct idlist *list;
- if (!(name = uid_to_name(uid))) return;
+ if (uid == 0)
+ return 0;
+
+ if (uid == last_in)
+ return last_out;
+
+ last_in = uid;
+
+ for (list = uidlist; list; list = list->next) {
+ if (list->id == (int)uid)
+ return last_out = (uid_t)list->id2;
+ }
- list->next = add_list((int)uid, name);
+ return last_out = uid;
}
-/* add a gid to the list of gids */
-void add_gid(gid_t gid)
+gid_t match_gid(gid_t gid)
{
- struct idlist *list = gidlist;
- char *name;
+ static gid_t last_in = GID_NONE, last_out = GID_NONE;
+ struct idlist *list;
- if (numeric_ids) return;
+ if (gid == GID_NONE)
+ return GID_NONE;
- /* don't map root */
- if (gid==0) return;
+ if (gid == last_in)
+ return last_out;
- if (!list) {
- if (!(name = gid_to_name(gid))) return;
- gidlist = add_list((int)gid, name);
- return;
- }
+ last_in = gid;
- while (list->next) {
- if (list->id == (int)gid) return;
- list = list->next;
+ for (list = gidlist; list; list = list->next) {
+ if (list->id == (int)gid)
+ return last_out = (gid_t)list->id2;
}
- if (list->id == (int)gid) return;
+ return last_out = recv_add_gid(gid, NULL);
+}
+
+/* Add a uid to the list of uids. Only called on sending side. */
+char *add_uid(uid_t uid)
+{
+ struct idlist *list;
+ struct idlist *node;
+
+ if (uid == 0) /* don't map root */
+ return NULL;
- if (!(name = gid_to_name(gid))) return;
+ for (list = uidlist; list; list = list->next) {
+ if (list->id == (int)uid)
+ return NULL;
+ }
- list->next = add_list((int)gid, name);
+ node = add_to_list(&uidlist, (int)uid, uid_to_name(uid), 0);
+ return node->name;
}
+/* Add a gid to the list of gids. Only called on sending side. */
+char *add_gid(gid_t gid)
+{
+ struct idlist *list;
+ struct idlist *node;
+
+ if (gid == 0) /* don't map root */
+ return NULL;
+
+ for (list = gidlist; list; list = list->next) {
+ if (list->id == (int)gid)
+ return NULL;
+ }
+
+ node = add_to_list(&gidlist, (int)gid, gid_to_name(gid), 0);
+ return node->name;
+}
/* send a complete uid/gid mapping to the peer */
void send_uid_list(int f)
{
struct idlist *list;
- if (numeric_ids) return;
-
- if (preserve_uid) {
+ if (preserve_uid || preserve_acls) {
+ int len;
/* we send sequences of uid/byte-length/name */
- list = uidlist;
- while (list) {
- int len = strlen(list->name);
+ for (list = uidlist; list; list = list->next) {
+ if (!list->name)
+ continue;
+ len = strlen(list->name);
write_int(f, list->id);
write_byte(f, len);
write_buf(f, list->name, len);
- list = list->next;
}
/* terminate the uid list with a 0 uid. We explicitly exclude
- 0 from the list */
+ * 0 from the list */
write_int(f, 0);
}
- if (preserve_gid) {
- list = gidlist;
- while (list) {
- int len = strlen(list->name);
+ if (preserve_gid || preserve_acls) {
+ int len;
+ for (list = gidlist; list; list = list->next) {
+ if (!list->name)
+ continue;
+ len = strlen(list->name);
write_int(f, list->id);
write_byte(f, len);
write_buf(f, list->name, len);
- list = list->next;
}
write_int(f, 0);
}
}
+uid_t recv_user_name(int f, uid_t uid)
+{
+ int len = read_byte(f);
+ char *name = new_array(char, len+1);
+ if (!name)
+ out_of_memory("recv_user_name");
+ read_sbuf(f, name, len);
+ return recv_add_uid(uid, name); /* node keeps name's memory */
+}
+
+gid_t recv_group_name(int f, gid_t gid)
+{
+ int len = read_byte(f);
+ char *name = new_array(char, len+1);
+ if (!name)
+ out_of_memory("recv_group_name");
+ read_sbuf(f, name, len);
+ return recv_add_gid(gid, name); /* node keeps name's memory */
+}
+
/* recv a complete uid/gid mapping from the peer and map the uid/gid
- in the file list to local names */
+ * in the file list to local names */
void recv_uid_list(int f, struct file_list *flist)
{
int id, i;
- char *name;
- struct idlist *list;
- if (numeric_ids) return;
-
- if (preserve_uid) {
+ if ((preserve_uid || preserve_acls) && !numeric_ids) {
/* read the uid list */
- list = uidlist;
- while ((id = read_int(f)) != 0) {
- int len = read_byte(f);
- name = new_array(char, len+1);
- if (!name) out_of_memory("recv_uid_list");
- read_sbuf(f, name, len);
- if (!list) {
- uidlist = add_list(id, name);
- list = uidlist;
- } else {
- list->next = add_list(id, name);
- list = list->next;
- }
- list->id2 = map_uid(id, name);
- free(name);
- }
+ while ((id = read_int(f)) != 0)
+ recv_user_name(f, (uid_t)id);
}
-
- if (preserve_gid) {
- /* and the gid list */
- list = gidlist;
- while ((id = read_int(f)) != 0) {
- int len = read_byte(f);
- name = new_array(char, len+1);
- if (!name) out_of_memory("recv_uid_list");
- read_sbuf(f, name, len);
- if (!list) {
- gidlist = add_list(id, name);
- list = gidlist;
- } else {
- list->next = add_list(id, name);
- list = list->next;
- }
- list->id2 = map_gid(id, name);
- if (!am_root && !is_in_group(list->id2))
- list->id2 = GID_NONE;
- free(name);
- }
+ if ((preserve_gid || preserve_acls) && !numeric_ids) {
+ /* read the gid list */
+ while ((id = read_int(f)) != 0)
+ recv_group_name(f, (gid_t)id);
}
- if (!(am_root && preserve_uid) && !preserve_gid) return;
+#ifdef SUPPORT_ACLS
+ if (preserve_acls && !numeric_ids) {
+ id_t *id;
+ while ((id = next_acl_uid(flist)) != NULL)
+ *id = match_uid(*id);
+ while ((id = next_acl_gid(flist)) != NULL)
+ *id = match_gid(*id);
+ }
+#endif
- /* now convert the uid/gid of all files in the list to the mapped
- uid/gid */
- for (i=0;i<flist->count;i++) {
- if (am_root && preserve_uid && flist->files[i]->uid != 0) {
- flist->files[i]->uid = match_uid(flist->files[i]->uid);
- }
- if (preserve_gid && flist->files[i]->gid != 0) {
- flist->files[i]->gid = match_gid(flist->files[i]->gid);
- }
+ /* Now convert all the uids/gids from sender values to our values. */
+ if (am_root && preserve_uid && !numeric_ids) {
+ for (i = 0; i < flist->count; i++)
+ F_OWNER(flist->files[i]) = match_uid(F_UID(flist->files[i]));
+ }
+ if (preserve_gid && (!am_root || !numeric_ids)) {
+ for (i = 0; i < flist->count; i++)
+ F_GROUP(flist->files[i]) = match_gid(F_GID(flist->files[i]));
}
}
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