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#include "system.h"
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#include <stdlib.h>
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#include <rpm/rpmstring.h>
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#include <rpm/rpmlog.h>
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#include "lib/rpmchroot.h"
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#include "debug.h"
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struct rootState_s {
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char *rootDir;
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int chrootDone;
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int cwd;
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};
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/* Process global chroot state */
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static struct rootState_s rootState = {
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.rootDir = NULL,
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.chrootDone = 0,
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.cwd = -1,
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};
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int rpmChrootSet(const char *rootDir)
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{
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int rc = 0;
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/* Setting same rootDir again is a no-op and not an error */
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if (rootDir && rootState.rootDir && rstreq(rootDir, rootState.rootDir))
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return 0;
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/* Resetting only permitted in neutral state */
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if (rootState.chrootDone != 0)
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return -1;
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rootState.rootDir = _free(rootState.rootDir);
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if (rootState.cwd >= 0) {
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close(rootState.cwd);
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rootState.cwd = -1;
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}
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if (rootDir != NULL) {
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rootState.rootDir = rstrdup(rootDir);
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rootState.cwd = open(".", O_RDONLY);
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if (rootState.cwd < 0) {
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rpmlog(RPMLOG_ERR, _("Unable to open current directory: %m\n"));
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rc = -1;
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}
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}
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return rc;
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}
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int rpmChrootIn(void)
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{
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int rc = 0;
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if (rootState.rootDir == NULL || rstreq(rootState.rootDir, "/"))
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return 0;
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if (rootState.cwd < 0) {
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rpmlog(RPMLOG_ERR, _("%s: chroot directory not set\n"), __func__);
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return -1;
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}
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/* "refcounted" entry to chroot */
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if (rootState.chrootDone > 0) {
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rootState.chrootDone++;
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} else if (rootState.chrootDone == 0) {
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if (chdir("/") == 0 && chroot(rootState.rootDir) == 0) {
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rootState.chrootDone = 1;
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} else {
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rpmlog(RPMLOG_ERR, _("Unable to change root directory: %m\n"));
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rc = -1;
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}
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}
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return rc;
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}
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int rpmChrootOut(void)
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{
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int rc = 0;
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if (rootState.rootDir == NULL || rstreq(rootState.rootDir, "/"))
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return 0;
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if (rootState.cwd < 0) {
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rpmlog(RPMLOG_ERR, _("%s: chroot directory not set\n"), __func__);
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return -1;
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}
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/* "refcounted" return from chroot */
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if (rootState.chrootDone > 1) {
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rootState.chrootDone--;
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} else if (rootState.chrootDone == 1) {
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if (chroot(".") == 0 && fchdir(rootState.cwd) == 0) {
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rootState.chrootDone = 0;
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} else {
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rpmlog(RPMLOG_ERR, _("Unable to restore root directory: %m\n"));
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rc = -1;
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}
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}
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return rc;
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}
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int rpmChrootDone(void)
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{
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return (rootState.chrootDone > 0);
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}
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