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exclude.c
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exclude.c
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/*
* The filter include/exclude routines.
*
* Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2002 Martin Pool
* Copyright (C) 2003-2022 Wayne Davison
*
* 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 3 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, visit the http://fsf.org website.
*/
#include "rsync.h"
#include "ifuncs.h"
extern int am_server;
extern int am_sender;
extern int am_generator;
extern int eol_nulls;
extern int io_error;
extern int xfer_dirs;
extern int recurse;
extern int local_server;
extern int prune_empty_dirs;
extern int ignore_perishable;
extern int relative_paths;
extern int delete_mode;
extern int delete_excluded;
extern int cvs_exclude;
extern int sanitize_paths;
extern int protocol_version;
extern int trust_sender_args;
extern int module_id;
extern char curr_dir[MAXPATHLEN];
extern unsigned int curr_dir_len;
extern unsigned int module_dirlen;
filter_rule_list filter_list = { .debug_type = "" };
filter_rule_list cvs_filter_list = { .debug_type = " [global CVS]" };
filter_rule_list daemon_filter_list = { .debug_type = " [daemon]" };
filter_rule_list implied_filter_list = { .debug_type = " [implied]" };
int saw_xattr_filter = 0;
int trust_sender_args = 0;
int trust_sender_filter = 0;
/* Need room enough for ":MODS " prefix plus some room to grow. */
#define MAX_RULE_PREFIX (16)
#define SLASH_WILD3_SUFFIX "/***"
/* The dirbuf is set by push_local_filters() to the current subdirectory
* relative to curr_dir that is being processed. The path always has a
* trailing slash appended, and the variable dirbuf_len contains the length
* of this path prefix. The path is always absolute. */
static char dirbuf[MAXPATHLEN+1];
static unsigned int dirbuf_len = 0;
static int dirbuf_depth;
/* This is True when we're scanning parent dirs for per-dir merge-files. */
static BOOL parent_dirscan = False;
/* This array contains a list of all the currently active per-dir merge
* files. This makes it easier to save the appropriate values when we
* "push" down into each subdirectory. */
static filter_rule **mergelist_parents;
static int mergelist_cnt = 0;
static int mergelist_size = 0;
#define LOCAL_RULE 1
#define REMOTE_RULE 2
static uchar cur_elide_value = REMOTE_RULE;
/* Each filter_list_struct describes a singly-linked list by keeping track
* of both the head and tail pointers. The list is slightly unusual in that
* a parent-dir's content can be appended to the end of the local list in a
* special way: the last item in the local list has its "next" pointer set
* to point to the inherited list, but the local list's tail pointer points
* at the end of the local list. Thus, if the local list is empty, the head
* will be pointing at the inherited content but the tail will be NULL. To
* help you visualize this, here are the possible list arrangements:
*
* Completely Empty Local Content Only
* ================================== ====================================
* head -> NULL head -> Local1 -> Local2 -> NULL
* tail -> NULL tail -------------^
*
* Inherited Content Only Both Local and Inherited Content
* ================================== ====================================
* head -> Parent1 -> Parent2 -> NULL head -> L1 -> L2 -> P1 -> P2 -> NULL
* tail -> NULL tail ---------^
*
* This means that anyone wanting to traverse the whole list to use it just
* needs to start at the head and use the "next" pointers until it goes
* NULL. To add new local content, we insert the item after the tail item
* and update the tail (obviously, if "tail" was NULL, we insert it at the
* head). To clear the local list, WE MUST NOT FREE THE INHERITED CONTENT
* because it is shared between the current list and our parent list(s).
* The easiest way to handle this is to simply truncate the list after the
* tail item and then free the local list from the head. When inheriting
* the list for a new local dir, we just save off the filter_list_struct
* values (so we can pop back to them later) and set the tail to NULL.
*/
static void teardown_mergelist(filter_rule *ex)
{
int j;
if (!ex->u.mergelist)
return;
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] deactivating mergelist #%d%s\n",
who_am_i(), mergelist_cnt - 1,
ex->u.mergelist->debug_type);
}
free(ex->u.mergelist->debug_type);
free(ex->u.mergelist);
for (j = 0; j < mergelist_cnt; j++) {
if (mergelist_parents[j] == ex) {
mergelist_parents[j] = NULL;
break;
}
}
while (mergelist_cnt && mergelist_parents[mergelist_cnt-1] == NULL)
mergelist_cnt--;
}
static void free_filter(filter_rule *ex)
{
if (ex->rflags & FILTRULE_PERDIR_MERGE)
teardown_mergelist(ex);
free(ex->pattern);
free(ex);
}
static void free_filters(filter_rule *ent)
{
while (ent) {
filter_rule *next = ent->next;
free_filter(ent);
ent = next;
}
}
/* Build a filter structure given a filter pattern. The value in "pat"
* is not null-terminated. "rule" is either held or freed, so the
* caller should not free it. */
static void add_rule(filter_rule_list *listp, const char *pat, unsigned int pat_len,
filter_rule *rule, int xflags)
{
const char *cp;
unsigned int pre_len, suf_len, slash_cnt = 0;
char *mention_rule_suffix;
if (DEBUG_GTE(FILTER, 1) && pat_len && (pat[pat_len-1] == ' ' || pat[pat_len-1] == '\t'))
mention_rule_suffix = " -- CAUTION: trailing whitespace!";
else
mention_rule_suffix = DEBUG_GTE(FILTER, 2) ? "" : NULL;
if (mention_rule_suffix) {
rprintf(FINFO, "[%s] add_rule(%s%.*s%s)%s%s\n",
who_am_i(), get_rule_prefix(rule, pat, 0, NULL),
(int)pat_len, pat, (rule->rflags & FILTRULE_DIRECTORY) ? "/" : "",
listp->debug_type, mention_rule_suffix);
}
/* These flags also indicate that we're reading a list that
* needs to be filtered now, not post-filtered later. */
if (xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH)
&& (rule->rflags & FILTRULES_SIDES)
== (am_sender ? FILTRULE_RECEIVER_SIDE : FILTRULE_SENDER_SIDE)) {
/* This filter applies only to the other side. Drop it. */
free_filter(rule);
return;
}
if (pat_len > 1 && pat[pat_len-1] == '/') {
pat_len--;
rule->rflags |= FILTRULE_DIRECTORY;
}
for (cp = pat; cp < pat + pat_len; cp++) {
if (*cp == '/')
slash_cnt++;
}
if (!(rule->rflags & (FILTRULE_ABS_PATH | FILTRULE_MERGE_FILE))
&& ((xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH) && *pat == '/')
|| (xflags & XFLG_ABS_IF_SLASH && slash_cnt))) {
rule->rflags |= FILTRULE_ABS_PATH;
if (*pat == '/')
pre_len = dirbuf_len - module_dirlen - 1;
else
pre_len = 0;
} else
pre_len = 0;
/* The daemon wants dir-exclude rules to get an appended "/" + "***". */
if (xflags & XFLG_DIR2WILD3
&& BITS_SETnUNSET(rule->rflags, FILTRULE_DIRECTORY, FILTRULE_INCLUDE)) {
rule->rflags &= ~FILTRULE_DIRECTORY;
suf_len = sizeof SLASH_WILD3_SUFFIX - 1;
} else
suf_len = 0;
rule->pattern = new_array(char, pre_len + pat_len + suf_len + 1);
if (pre_len) {
memcpy(rule->pattern, dirbuf + module_dirlen, pre_len);
for (cp = rule->pattern; cp < rule->pattern + pre_len; cp++) {
if (*cp == '/')
slash_cnt++;
}
}
rule->elide = 0;
strlcpy(rule->pattern + pre_len, pat, pat_len + 1);
pat_len += pre_len;
if (suf_len) {
memcpy(rule->pattern + pat_len, SLASH_WILD3_SUFFIX, suf_len+1);
pat_len += suf_len;
slash_cnt++;
}
if (strpbrk(rule->pattern, "*[?")) {
rule->rflags |= FILTRULE_WILD;
if ((cp = strstr(rule->pattern, "**")) != NULL) {
rule->rflags |= FILTRULE_WILD2;
/* If the pattern starts with **, note that. */
if (cp == rule->pattern)
rule->rflags |= FILTRULE_WILD2_PREFIX;
/* If the pattern ends with ***, note that. */
if (pat_len >= 3
&& rule->pattern[pat_len-3] == '*'
&& rule->pattern[pat_len-2] == '*'
&& rule->pattern[pat_len-1] == '*')
rule->rflags |= FILTRULE_WILD3_SUFFIX;
}
}
if (rule->rflags & FILTRULE_PERDIR_MERGE) {
filter_rule_list *lp;
unsigned int len;
int i;
if ((cp = strrchr(rule->pattern, '/')) != NULL)
cp++;
else
cp = rule->pattern;
/* If the local merge file was already mentioned, don't
* add it again. */
for (i = 0; i < mergelist_cnt; i++) {
filter_rule *ex = mergelist_parents[i];
const char *s;
if (!ex)
continue;
s = strrchr(ex->pattern, '/');
if (s)
s++;
else
s = ex->pattern;
len = strlen(s);
if (len == pat_len - (cp - rule->pattern) && memcmp(s, cp, len) == 0) {
free_filter(rule);
return;
}
}
lp = new_array0(filter_rule_list, 1);
if (asprintf(&lp->debug_type, " [per-dir %s]", cp) < 0)
out_of_memory("add_rule");
rule->u.mergelist = lp;
if (mergelist_cnt == mergelist_size) {
mergelist_size += 5;
mergelist_parents = realloc_array(mergelist_parents, filter_rule *, mergelist_size);
}
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] activating mergelist #%d%s\n",
who_am_i(), mergelist_cnt, lp->debug_type);
}
mergelist_parents[mergelist_cnt++] = rule;
} else
rule->u.slash_cnt = slash_cnt;
if (!listp->tail) {
rule->next = listp->head;
listp->head = listp->tail = rule;
} else {
rule->next = listp->tail->next;
listp->tail->next = rule;
listp->tail = rule;
}
}
/* If the wildcards failed, the remote shell might give us a file matching the literal
* wildcards. Since "*" & "?" already match themselves, this just needs to deal with
* failed "[foo]" idioms.
*/
static void maybe_add_literal_brackets_rule(filter_rule const *based_on, int arg_len)
{
filter_rule *rule;
const char *arg = based_on->pattern, *cp;
char *p;
int cnt = 0;
if (arg_len < 0)
arg_len = strlen(arg);
for (cp = arg; *cp; cp++) {
if (*cp == '\\' && cp[1]) {
cp++;
} else if (*cp == '[')
cnt++;
}
if (!cnt)
return;
rule = new0(filter_rule);
rule->rflags = based_on->rflags;
rule->u.slash_cnt = based_on->u.slash_cnt;
p = rule->pattern = new_array(char, arg_len + cnt + 1);
for (cp = arg; *cp; ) {
if (*cp == '\\' && cp[1]) {
*p++ = *cp++;
} else if (*cp == '[')
*p++ = '\\';
*p++ = *cp++;
}
*p++ = '\0';
rule->next = implied_filter_list.head;
implied_filter_list.head = rule;
if (DEBUG_GTE(FILTER, 3)) {
rprintf(FINFO, "[%s] add_implied_include(%s%s)\n", who_am_i(), rule->pattern,
rule->rflags & FILTRULE_DIRECTORY ? "/" : "");
}
}
static char *partial_string_buf = NULL;
static int partial_string_len = 0;
void implied_include_partial_string(const char *s_start, const char *s_end)
{
partial_string_len = s_end - s_start;
if (partial_string_len <= 0 || partial_string_len >= MAXPATHLEN) { /* too-large should be impossible... */
partial_string_len = 0;
return;
}
if (!partial_string_buf)
partial_string_buf = new_array(char, MAXPATHLEN);
memcpy(partial_string_buf, s_start, partial_string_len);
}
void free_implied_include_partial_string()
{
if (partial_string_buf) {
if (partial_string_len)
add_implied_include("", 0);
free(partial_string_buf);
partial_string_buf = NULL;
}
partial_string_len = 0; /* paranoia */
}
/* Each arg the client sends to the remote sender turns into an implied include
* that the receiver uses to validate the file list from the sender. */
void add_implied_include(const char *arg, int skip_daemon_module)
{
int arg_len, saw_wild = 0, saw_live_open_brkt = 0, backslash_cnt = 0;
int slash_cnt = 0;
const char *cp;
char *p;
if (trust_sender_args)
return;
if (partial_string_len) {
arg_len = strlen(arg);
if (partial_string_len + arg_len >= MAXPATHLEN) {
partial_string_len = 0;
return; /* Should be impossible... */
}
memcpy(partial_string_buf + partial_string_len, arg, arg_len + 1);
partial_string_len = 0;
arg = partial_string_buf;
}
if (skip_daemon_module) {
if ((cp = strchr(arg, '/')) != NULL)
arg = cp + 1;
else
arg = "";
}
if (relative_paths) {
if ((cp = strstr(arg, "/./")) != NULL)
arg = cp + 3;
} else if ((cp = strrchr(arg, '/')) != NULL) {
arg = cp + 1;
}
if (*arg == '.' && arg[1] == '\0')
arg++;
arg_len = strlen(arg);
if (arg_len) {
char *new_pat;
if (strpbrk(arg, "*[?")) {
/* We need to add room to escape backslashes if wildcard chars are present. */
for (cp = arg; (cp = strchr(cp, '\\')) != NULL; cp++)
arg_len++;
saw_wild = 1;
}
arg_len++; /* Leave room for the prefixed slash */
p = new_pat = new_array(char, arg_len + 1);
*p++ = '/';
slash_cnt++;
for (cp = arg; *cp; ) {
switch (*cp) {
case '\\':
if (cp[1] == ']') {
if (!saw_wild)
cp++; /* A \] in a non-wild filter causes a problem, so drop the \ . */
} else if (!strchr("*[?", cp[1])) {
backslash_cnt++;
if (saw_wild)
*p++ = '\\';
}
*p++ = *cp++;
break;
case '/':
if (p[-1] == '/') { /* This is safe because of the initial slash. */
if (*++cp == '\0') {
slash_cnt--;
p--;
}
} else if (cp[1] == '\0') {
cp++;
} else {
slash_cnt++;
*p++ = *cp++;
}
break;
case '.':
if (p[-1] == '/') {
if (cp[1] == '/') {
cp += 2;
if (!*cp) {
slash_cnt--;
p--;
}
} else if (cp[1] == '\0') {
cp++;
slash_cnt--;
p--;
} else
*p++ = *cp++;
} else
*p++ = *cp++;
break;
case '[':
saw_live_open_brkt = 1;
*p++ = *cp++;
break;
default:
*p++ = *cp++;
break;
}
}
*p = '\0';
arg_len = p - new_pat;
if (!arg_len)
free(new_pat);
else {
filter_rule *rule = new0(filter_rule);
rule->rflags = FILTRULE_INCLUDE + (saw_wild ? FILTRULE_WILD : 0);
rule->u.slash_cnt = slash_cnt;
arg = rule->pattern = new_pat;
if (!implied_filter_list.head)
implied_filter_list.head = implied_filter_list.tail = rule;
else {
rule->next = implied_filter_list.head;
implied_filter_list.head = rule;
}
if (DEBUG_GTE(FILTER, 3))
rprintf(FINFO, "[%s] add_implied_include(%s)\n", who_am_i(), arg);
if (saw_live_open_brkt)
maybe_add_literal_brackets_rule(rule, arg_len);
if (relative_paths && slash_cnt) {
int sub_slash_cnt = slash_cnt;
while ((p = strrchr(new_pat, '/')) != NULL && p != new_pat) {
filter_rule const *ent;
filter_rule *R_rule;
int found = 0;
*p = '\0';
for (ent = implied_filter_list.head; ent; ent = ent->next) {
if (ent != rule && strcmp(ent->pattern, new_pat) == 0) {
found = 1;
break;
}
}
if (found) {
*p = '/';
break; /* We added all parent dirs already */
}
R_rule = new0(filter_rule);
R_rule->rflags = FILTRULE_INCLUDE | FILTRULE_DIRECTORY;
/* Check if our sub-path has wildcards or escaped backslashes */
if (saw_wild && strpbrk(new_pat, "*[?\\"))
R_rule->rflags |= FILTRULE_WILD;
R_rule->pattern = strdup(new_pat);
R_rule->u.slash_cnt = --sub_slash_cnt;
R_rule->next = implied_filter_list.head;
implied_filter_list.head = R_rule;
if (DEBUG_GTE(FILTER, 3)) {
rprintf(FINFO, "[%s] add_implied_include(%s/)\n",
who_am_i(), R_rule->pattern);
}
if (saw_live_open_brkt)
maybe_add_literal_brackets_rule(R_rule, -1);
}
for (p = new_pat; sub_slash_cnt < slash_cnt; sub_slash_cnt++) {
p += strlen(p);
*p = '/';
}
}
}
}
if (recurse || xfer_dirs) {
/* Now create a rule with an added "/" & "**" or "*" at the end */
filter_rule *rule = new0(filter_rule);
rule->rflags = FILTRULE_INCLUDE | FILTRULE_WILD;
if (recurse)
rule->rflags |= FILTRULE_WILD2;
/* We must leave enough room for / * * \0. */
if (!saw_wild && backslash_cnt) {
/* We are appending a wildcard, so now the backslashes need to be escaped. */
p = rule->pattern = new_array(char, arg_len + backslash_cnt + 3 + 1);
for (cp = arg; *cp; ) { /* Note that arg_len != 0 because backslash_cnt > 0 */
if (*cp == '\\')
*p++ = '\\';
*p++ = *cp++;
}
} else {
p = rule->pattern = new_array(char, arg_len + 3 + 1);
if (arg_len) {
memcpy(p, arg, arg_len);
p += arg_len;
}
}
*p++ = '/';
*p++ = '*';
if (recurse)
*p++ = '*';
*p = '\0';
rule->u.slash_cnt = slash_cnt + 1;
rule->next = implied_filter_list.head;
implied_filter_list.head = rule;
if (DEBUG_GTE(FILTER, 3))
rprintf(FINFO, "[%s] add_implied_include(%s)\n", who_am_i(), rule->pattern);
if (saw_live_open_brkt)
maybe_add_literal_brackets_rule(rule, p - rule->pattern);
}
}
/* This frees any non-inherited items, leaving just inherited items on the list. */
static void pop_filter_list(filter_rule_list *listp)
{
filter_rule *inherited;
if (!listp->tail)
return;
inherited = listp->tail->next;
/* Truncate any inherited items from the local list. */
listp->tail->next = NULL;
/* Now free everything that is left. */
free_filters(listp->head);
listp->head = inherited;
listp->tail = NULL;
}
/* This returns an expanded (absolute) filename for the merge-file name if
* the name has any slashes in it OR if the parent_dirscan var is True;
* otherwise it returns the original merge_file name. If the len_ptr value
* is non-NULL the merge_file name is limited by the referenced length
* value and will be updated with the length of the resulting name. We
* always return a name that is null terminated, even if the merge_file
* name was not. */
static char *parse_merge_name(const char *merge_file, unsigned int *len_ptr,
unsigned int prefix_skip)
{
static char buf[MAXPATHLEN];
char *fn, tmpbuf[MAXPATHLEN];
unsigned int fn_len;
if (!parent_dirscan && *merge_file != '/') {
/* Return the name unchanged it doesn't have any slashes. */
if (len_ptr) {
const char *p = merge_file + *len_ptr;
while (--p > merge_file && *p != '/') {}
if (p == merge_file) {
strlcpy(buf, merge_file, *len_ptr + 1);
return buf;
}
} else if (strchr(merge_file, '/') == NULL)
return (char *)merge_file;
}
fn = *merge_file == '/' ? buf : tmpbuf;
if (sanitize_paths) {
const char *r = prefix_skip ? "/" : NULL;
/* null-terminate the name if it isn't already */
if (len_ptr && merge_file[*len_ptr]) {
char *to = fn == buf ? tmpbuf : buf;
strlcpy(to, merge_file, *len_ptr + 1);
merge_file = to;
}
if (!sanitize_path(fn, merge_file, r, dirbuf_depth, SP_DEFAULT)) {
rprintf(FERROR, "merge-file name overflows: %s\n",
merge_file);
return NULL;
}
fn_len = strlen(fn);
} else {
strlcpy(fn, merge_file, len_ptr ? *len_ptr + 1 : MAXPATHLEN);
fn_len = clean_fname(fn, CFN_COLLAPSE_DOT_DOT_DIRS);
}
/* If the name isn't in buf yet, it wasn't absolute. */
if (fn != buf) {
int d_len = dirbuf_len - prefix_skip;
if (d_len + fn_len >= MAXPATHLEN) {
rprintf(FERROR, "merge-file name overflows: %s\n", fn);
return NULL;
}
memcpy(buf, dirbuf + prefix_skip, d_len);
memcpy(buf + d_len, fn, fn_len + 1);
fn_len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
}
if (len_ptr)
*len_ptr = fn_len;
return buf;
}
/* Sets the dirbuf and dirbuf_len values. */
void set_filter_dir(const char *dir, unsigned int dirlen)
{
unsigned int len;
if (*dir != '/') {
memcpy(dirbuf, curr_dir, curr_dir_len);
dirbuf[curr_dir_len] = '/';
len = curr_dir_len + 1;
if (len + dirlen >= MAXPATHLEN)
dirlen = 0;
} else
len = 0;
memcpy(dirbuf + len, dir, dirlen);
dirbuf[dirlen + len] = '\0';
dirbuf_len = clean_fname(dirbuf, CFN_COLLAPSE_DOT_DOT_DIRS);
if (dirbuf_len > 1 && dirbuf[dirbuf_len-1] == '.'
&& dirbuf[dirbuf_len-2] == '/')
dirbuf_len -= 2;
if (dirbuf_len != 1)
dirbuf[dirbuf_len++] = '/';
dirbuf[dirbuf_len] = '\0';
if (sanitize_paths)
dirbuf_depth = count_dir_elements(dirbuf + module_dirlen);
}
/* This routine takes a per-dir merge-file entry and finishes its setup.
* If the name has a path portion then we check to see if it refers to a
* parent directory of the first transfer dir. If it does, we scan all the
* dirs from that point through the parent dir of the transfer dir looking
* for the per-dir merge-file in each one. */
static BOOL setup_merge_file(int mergelist_num, filter_rule *ex,
filter_rule_list *lp)
{
char buf[MAXPATHLEN];
char *x, *y, *pat = ex->pattern;
unsigned int len;
if (!(x = parse_merge_name(pat, NULL, 0)) || *x != '/')
return 0;
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] performing parent_dirscan for mergelist #%d%s\n",
who_am_i(), mergelist_num, lp->debug_type);
}
y = strrchr(x, '/');
*y = '\0';
ex->pattern = strdup(y+1);
if (!*x)
x = "/";
if (*x == '/')
strlcpy(buf, x, MAXPATHLEN);
else
pathjoin(buf, MAXPATHLEN, dirbuf, x);
len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
if (len != 1 && len < MAXPATHLEN-1) {
buf[len++] = '/';
buf[len] = '\0';
}
/* This ensures that the specified dir is a parent of the transfer. */
for (x = buf, y = dirbuf; *x && *x == *y; x++, y++) {}
if (*x)
y += strlen(y); /* nope -- skip the scan */
parent_dirscan = True;
while (*y) {
char save[MAXPATHLEN];
strlcpy(save, y, MAXPATHLEN);
*y = '\0';
dirbuf_len = y - dirbuf;
strlcpy(x, ex->pattern, MAXPATHLEN - (x - buf));
parse_filter_file(lp, buf, ex, XFLG_ANCHORED2ABS);
if (ex->rflags & FILTRULE_NO_INHERIT) {
/* Free the undesired rules to clean up any per-dir
* mergelists they defined. Otherwise pop_local_filters
* may crash trying to restore nonexistent state for
* those mergelists. */
free_filters(lp->head);
lp->head = NULL;
}
lp->tail = NULL;
strlcpy(y, save, MAXPATHLEN);
while ((*x++ = *y++) != '/') {}
}
parent_dirscan = False;
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] completed parent_dirscan for mergelist #%d%s\n",
who_am_i(), mergelist_num, lp->debug_type);
}
free(pat);
return 1;
}
struct local_filter_state {
int mergelist_cnt;
filter_rule_list mergelists[1];
};
/* Each time rsync changes to a new directory it call this function to
* handle all the per-dir merge-files. The "dir" value is the current path
* relative to curr_dir (which might not be null-terminated). We copy it
* into dirbuf so that we can easily append a file name on the end. */
void *push_local_filters(const char *dir, unsigned int dirlen)
{
struct local_filter_state *push;
int i;
set_filter_dir(dir, dirlen);
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] pushing local filters for %s\n",
who_am_i(), dirbuf);
}
if (!mergelist_cnt) {
/* No old state to save and no new merge files to push. */
return NULL;
}
push = (struct local_filter_state *)new_array(char,
sizeof (struct local_filter_state)
+ (mergelist_cnt-1) * sizeof (filter_rule_list));
push->mergelist_cnt = mergelist_cnt;
for (i = 0; i < mergelist_cnt; i++) {
filter_rule *ex = mergelist_parents[i];
if (!ex)
continue;
memcpy(&push->mergelists[i], ex->u.mergelist, sizeof (filter_rule_list));
}
/* Note: parse_filter_file() might increase mergelist_cnt, so keep
* this loop separate from the above loop. */
for (i = 0; i < mergelist_cnt; i++) {
filter_rule *ex = mergelist_parents[i];
filter_rule_list *lp;
if (!ex)
continue;
lp = ex->u.mergelist;
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] pushing mergelist #%d%s\n",
who_am_i(), i, lp->debug_type);
}
lp->tail = NULL; /* Switch any local rules to inherited. */
if (ex->rflags & FILTRULE_NO_INHERIT)
lp->head = NULL;
if (ex->rflags & FILTRULE_FINISH_SETUP) {
ex->rflags &= ~FILTRULE_FINISH_SETUP;
if (setup_merge_file(i, ex, lp))
set_filter_dir(dir, dirlen);
}
if (strlcpy(dirbuf + dirbuf_len, ex->pattern,
MAXPATHLEN - dirbuf_len) < MAXPATHLEN - dirbuf_len) {
parse_filter_file(lp, dirbuf, ex,
XFLG_ANCHORED2ABS);
} else {
io_error |= IOERR_GENERAL;
rprintf(FERROR,
"cannot add local filter rules in long-named directory: %s\n",
full_fname(dirbuf));
}
dirbuf[dirbuf_len] = '\0';
}
return (void*)push;
}
void pop_local_filters(void *mem)
{
struct local_filter_state *pop = (struct local_filter_state *)mem;
int i;
int old_mergelist_cnt = pop ? pop->mergelist_cnt : 0;
if (DEBUG_GTE(FILTER, 2))
rprintf(FINFO, "[%s] popping local filters\n", who_am_i());
for (i = mergelist_cnt; i-- > 0; ) {
filter_rule *ex = mergelist_parents[i];
filter_rule_list *lp;
if (!ex)
continue;
lp = ex->u.mergelist;
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] popping mergelist #%d%s\n",
who_am_i(), i, lp->debug_type);
}
pop_filter_list(lp);
if (i >= old_mergelist_cnt && lp->head) {
/* This mergelist does not exist in the state to be restored, but it
* still has inherited rules. This can sometimes happen if a per-dir
* merge file calls setup_merge_file() in push_local_filters() and that
* leaves some inherited rules that aren't in the pushed list state. */
if (DEBUG_GTE(FILTER, 2)) {
rprintf(FINFO, "[%s] freeing parent_dirscan filters of mergelist #%d%s\n",
who_am_i(), i, ex->u.mergelist->debug_type);
}
pop_filter_list(lp);
}
}
if (!pop)
return; /* No state to restore. */
for (i = 0; i < old_mergelist_cnt; i++) {
filter_rule *ex = mergelist_parents[i];
if (!ex)
continue;
memcpy(ex->u.mergelist, &pop->mergelists[i], sizeof (filter_rule_list));
}
free(pop);
}
void change_local_filter_dir(const char *dname, int dlen, int dir_depth)
{
static int cur_depth = -1;
static void *filt_array[MAXPATHLEN/2+1];
if (!dname) {
for ( ; cur_depth >= 0; cur_depth--) {
if (filt_array[cur_depth]) {
pop_local_filters(filt_array[cur_depth]);
filt_array[cur_depth] = NULL;
}
}
return;
}
assert(dir_depth < MAXPATHLEN/2+1);
for ( ; cur_depth >= dir_depth; cur_depth--) {
if (filt_array[cur_depth]) {
pop_local_filters(filt_array[cur_depth]);
filt_array[cur_depth] = NULL;
}
}
cur_depth = dir_depth;
filt_array[cur_depth] = push_local_filters(dname, dlen);
}
static int rule_matches(const char *fname, filter_rule *ex, int name_flags)
{
int slash_handling, str_cnt = 0, anchored_match = 0;
int ret_match = ex->rflags & FILTRULE_NEGATE ? 0 : 1;
char *p, *pattern = ex->pattern;
const char *strings[16]; /* more than enough */
const char *name = fname + (*fname == '/');
if (!*name || ex->elide == cur_elide_value)
return 0;
if (!(name_flags & NAME_IS_XATTR) ^ !(ex->rflags & FILTRULE_XATTR))
return 0;
if (!ex->u.slash_cnt && !(ex->rflags & FILTRULE_WILD2)) {
/* If the pattern does not have any slashes AND it does
* not have a "**" (which could match a slash), then we
* just match the name portion of the path. */
if ((p = strrchr(name,'/')) != NULL)
name = p+1;
} else if (ex->rflags & FILTRULE_ABS_PATH && *fname != '/'
&& curr_dir_len > module_dirlen + 1) {
/* If we're matching against an absolute-path pattern,
* we need to prepend our full path info. */
strings[str_cnt++] = curr_dir + module_dirlen + 1;
strings[str_cnt++] = "/";
} else if (ex->rflags & FILTRULE_WILD2_PREFIX && *fname != '/') {
/* Allow "**"+"/" to match at the start of the string. */
strings[str_cnt++] = "/";
}
strings[str_cnt++] = name;
if (name_flags & NAME_IS_DIR) {
/* Allow a trailing "/"+"***" to match the directory. */
if (ex->rflags & FILTRULE_WILD3_SUFFIX)
strings[str_cnt++] = "/";
} else if (ex->rflags & FILTRULE_DIRECTORY)
return !ret_match;
strings[str_cnt] = NULL;
if (*pattern == '/') {
anchored_match = 1;
pattern++;
}
if (!anchored_match && ex->u.slash_cnt
&& !(ex->rflags & FILTRULE_WILD2)) {
/* A non-anchored match with an infix slash and no "**"
* needs to match the last slash_cnt+1 name elements. */
slash_handling = ex->u.slash_cnt + 1;
} else if (!anchored_match && !(ex->rflags & FILTRULE_WILD2_PREFIX)
&& ex->rflags & FILTRULE_WILD2) {
/* A non-anchored match with an infix or trailing "**" (but not
* a prefixed "**") needs to try matching after every slash. */
slash_handling = -1;
} else {
/* The pattern matches only at the start of the path or name. */
slash_handling = 0;
}
if (ex->rflags & FILTRULE_WILD) {
if (wildmatch_array(pattern, strings, slash_handling))
return ret_match;
} else if (str_cnt > 1) {
if (litmatch_array(pattern, strings, slash_handling))
return ret_match;
} else if (anchored_match) {
if (strcmp(name, pattern) == 0)
return ret_match;
} else {
int l1 = strlen(name);
int l2 = strlen(pattern);
if (l2 <= l1 &&
strcmp(name+(l1-l2),pattern) == 0 &&
(l1==l2 || name[l1-(l2+1)] == '/')) {
return ret_match;
}
}
return !ret_match;
}
static void report_filter_result(enum logcode code, char const *name,
filter_rule const *ent,
int name_flags, const char *type)
{
int log_level = am_sender || am_generator ? 1 : 3;
/* If a trailing slash is present to match only directories,
* then it is stripped out by add_rule(). So as a special
* case we add it back in the log output. */
if (DEBUG_GTE(FILTER, log_level)) {
static char *actions[2][2]
= { {"show", "hid"}, {"risk", "protect"} };
const char *w = who_am_i();
const char *t = name_flags & NAME_IS_XATTR ? "xattr"
: name_flags & NAME_IS_DIR ? "directory"
: "file";
rprintf(code, "[%s] %sing %s %s because of pattern %s%s%s\n",
w, actions[*w=='g'][!(ent->rflags & FILTRULE_INCLUDE)],