Signed-off-by: Andrew Gregory <[email protected]>
---
Updated to include lrealpath definition and a buffer overflow check..
src/pacman/query.c | 137 +++++++++++++++++++++++++----------------------------
1 file changed, 64 insertions(+), 73 deletions(-)
diff --git a/src/pacman/query.c b/src/pacman/query.c
index f051571..f5862a2 100644
--- a/src/pacman/query.c
+++ b/src/pacman/query.c
@@ -90,6 +90,49 @@ static void print_query_fileowner(const char *filename,
alpm_pkg_t *info)
}
}
+/** Resolve the canonicalized absolute path of a symlink.
+ * @param path path to resolve
+ * @param resolved_path destination for the resolved path, will be malloc'd if
+ * NULL
+ * @return the resolved path
+ */
+static char *lrealpath(const char *path, char *resolved_path)
+{
+ const char *bname = mbasename(path);
+ char *rpath = NULL, *dname = NULL;
+ int success = 0;
+
+ if(strcmp(path, ".") == 0 || strcmp(path, "..") == 0) {
+ /* the entire path needs to be resolved */
+ return realpath(path, resolved_path);
+ }
+
+ if(!(dname = mdirname(path))) {
+ goto cleanup;
+ }
+ if(!(rpath = realpath(dname, NULL))) {
+ goto cleanup;
+ }
+ if(!resolved_path) {
+ if(!(resolved_path = malloc(strlen(rpath) + strlen(bname) +
2))) {
+ goto cleanup;
+ }
+ }
+
+ strcpy(resolved_path, rpath);
+ if(resolved_path[strlen(resolved_path) - 1] != '/') {
+ strcat(resolved_path, "/");
+ }
+ strcat(resolved_path, bname);
+ success = 1;
+
+cleanup:
+ free(dname);
+ free(rpath);
+
+ return (success ? resolved_path : NULL);
+}
+
static int query_fileowner(alpm_list_t *targets)
{
int ret = 0;
@@ -133,11 +176,11 @@ static int query_fileowner(alpm_list_t *targets)
packages = alpm_db_get_pkgcache(db_local);
for(t = targets; t; t = alpm_list_next(t)) {
- char *filename = NULL, *dname = NULL, *rpath = NULL;
- const char *bname;
+ char *filename = NULL;
+ char rpath[PATH_MAX], *rel_path;
struct stat buf;
alpm_list_t *i;
- size_t len, is_dir, bname_len, pbname_len;
+ size_t len, is_dir;
unsigned int found = 0;
if((filename = strdup(t->data)) == NULL) {
@@ -165,82 +208,32 @@ static int query_fileowner(alpm_list_t *targets)
}
}
- is_dir = S_ISDIR(buf.st_mode) ? 1 : 0;
- if(is_dir) {
- /* the entire filename is safe to resolve if we know it
points to a dir,
- * and it's necessary in case it ends in . or .. */
- dname = realpath(filename, NULL);
- bname = mbasename(dname);
- rpath = mdirname(dname);
- } else {
- bname = mbasename(filename);
- dname = mdirname(filename);
- rpath = realpath(dname, NULL);
- }
-
- bname_len = strlen(bname);
- pbname_len = bname_len + is_dir;
-
- if(!dname || !rpath) {
+ if(!lrealpath(filename, rpath)) {
pm_printf(ALPM_LOG_ERROR, _("cannot determine real path
for '%s': %s\n"),
filename, strerror(errno));
goto targcleanup;
}
- for(i = packages; i && (!found || is_dir); i =
alpm_list_next(i)) {
- alpm_pkg_t *info = i->data;
- alpm_filelist_t *filelist = alpm_pkg_get_files(info);
- size_t j;
-
- for(j = 0; j < filelist->count; j++) {
- const alpm_file_t *file = filelist->files + j;
- char *ppath;
- const char *pkgfile = file->name;
- size_t pkgfile_len = strlen(pkgfile);
-
- /* make sure pkgfile and target are of the same
type */
- if(is_dir != (pkgfile[pkgfile_len - 1] == '/'))
{
- continue;
- }
-
- /* make sure pkgfile is long enough */
- if(pkgfile_len < pbname_len) {
- continue;
- }
-
- /* make sure pbname_len takes us to the start
of a path component */
- if(pbname_len != pkgfile_len &&
pkgfile[pkgfile_len - pbname_len - 1] != '/') {
- continue;
- }
+ if(strncmp(rpath, path, rootlen) != 0) {
+ /* file is outside root, we know nothing can own it */
+ pm_printf(ALPM_LOG_ERROR, _("No package owns %s\n"),
filename);
+ goto targcleanup;
+ }
- /* compare basename with bname */
- if(strncmp(pkgfile + pkgfile_len - pbname_len,
bname, bname_len) != 0) {
- continue;
- }
+ rel_path = rpath + rootlen;
- /* concatenate our dirname and the root path */
- if(rootlen + 1 + pkgfile_len - pbname_len >
PATH_MAX) {
- path[rootlen] = '\0'; /* reset path for
error message */
- pm_printf(ALPM_LOG_ERROR, _("path too
long: %s%s\n"), path, pkgfile);
- continue;
- }
- strncpy(path + rootlen, pkgfile, pkgfile_len -
pbname_len);
- path[rootlen + pkgfile_len - pbname_len] = '\0';
-
- ppath = realpath(path, NULL);
- if(!ppath) {
- pm_printf(ALPM_LOG_ERROR, _("cannot
determine real path for '%s': %s\n"),
- path, strerror(errno));
- continue;
- }
+ if((is_dir = S_ISDIR(buf.st_mode))) {
+ size_t rlen = strlen(rpath);
+ if(rlen + 2 >= PATH_MAX) {
+ pm_printf(ALPM_LOG_ERROR, _("path too
long: %s/\n"), rpath);
+ }
+ strcat(rpath + rlen, "/");
+ }
- if(strcmp(ppath, rpath) == 0) {
- print_query_fileowner(filename, info);
- found = 1;
- free(ppath);
- break;
- }
- free(ppath);
+ for(i = packages; i && (!found || is_dir); i =
alpm_list_next(i)) {
+ if(alpm_filelist_contains(alpm_pkg_get_files(i->data),
rel_path)) {
+ print_query_fileowner(rpath, i->data);
+ found = 1;
}
}
if(!found) {
@@ -252,8 +245,6 @@ targcleanup:
ret++;
}
free(filename);
- free(rpath);
- free(dname);
}
return ret;
--
1.8.2.2
