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-rw-r--r--camel/camel-lock-helper.c390
1 files changed, 0 insertions, 390 deletions
diff --git a/camel/camel-lock-helper.c b/camel/camel-lock-helper.c
deleted file mode 100644
index 9e5dc012a3..0000000000
--- a/camel/camel-lock-helper.c
+++ /dev/null
@@ -1,390 +0,0 @@
-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
- *
- * Copyright (C) 2001 Ximian Inc.
- *
- * Authors: Michael Zucchi <notzed@ximian.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-/* lock helper process */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <errno.h>
-
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include <signal.h>
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <utime.h>
-
-#include <time.h>
-
-#include <string.h>
-
-#define SETEUID_SAVES (1)
-
-/* we try and include as little as possible */
-
-#include "camel-lock-helper.h"
-#include "camel-lock.h"
-
-#define d(x)
-
-/* keeps track of open locks */
-struct _lock_info {
- struct _lock_info *next;
- uid_t uid;
- int id;
- int depth;
- time_t stamp; /* when last updated */
- char path[1];
-};
-
-static int lock_id = 0;
-static struct _lock_info *lock_info_list;
-static uid_t lock_root_uid = -1;
-static uid_t lock_real_uid = -1;
-
-/* utility functions */
-
-static int read_n(int fd, void *buffer, int inlen)
-{
- char *p = buffer;
- int len, left = inlen;
-
- do {
- len = read(fd, p, left);
- if (len == -1) {
- if (errno != EINTR)
- return -1;
- } else {
- left -= len;
- p += len;
- }
- } while (left > 0 && len != 0);
-
- return inlen - left;
-}
-
-static int write_n(int fd, void *buffer, int inlen)
-{
- char *p = buffer;
- int len, left = inlen;
-
- do {
- len = write(fd, p, left);
- if (len == -1) {
- if (errno != EINTR)
- return -1;
- } else {
- left -= len;
- p += len;
- }
- } while (left > 0);
-
- return inlen;
-}
-
-void
-camel_exception_setv (CamelException *ex, ExceptionId id, const char *format, ...)
-{
- ;
-}
-
-void
-camel_exception_clear (CamelException *exception)
-{
- ;
-}
-
-char *gettext (const char *msgid);
-
-char *
-gettext (const char *msgid)
-{
- return NULL;
-}
-
-static int lock_path(const char *path, guint32 *lockid)
-{
- struct _lock_info *info = NULL;
- int res = CAMEL_LOCK_HELPER_STATUS_OK;
- struct stat st;
-
- d(fprintf(stderr, "locking path '%s' id = %d\n", path, lock_id));
-
- /* check to see if we have it locked already, make the lock 'recursive' */
- /* we could also error i suppose, but why bother */
- info = lock_info_list;
- while (info) {
- if (!strcmp(info->path, path)) {
- info->depth++;
- return CAMEL_LOCK_HELPER_STATUS_OK;
- }
- info = info->next;
- }
-
- /* check we are allowed to lock it, we must own it, be able to write to it, and it has to exist */
- if (stat(path, &st) == -1
- || st.st_uid != getuid()
- || !S_ISREG(st.st_mode)
- || (st.st_mode & 0400) == 0) {
- return CAMEL_LOCK_HELPER_STATUS_INVALID;
- }
-
- info = malloc(sizeof(*info) + strlen(path));
- if (info == NULL) {
- res = CAMEL_LOCK_HELPER_STATUS_NOMEM;
- goto fail;
- }
-
- /* we try the real uid first, and if that fails, try the 'root id' */
- if (camel_lock_dot(path, NULL) == -1) {
-#ifdef SETEUID_SAVES
- if (lock_real_uid != lock_root_uid) {
- if (seteuid(lock_root_uid) != -1) {
- if (camel_lock_dot(path, NULL) == -1) {
- seteuid(lock_real_uid);
- res = CAMEL_LOCK_HELPER_STATUS_SYSTEM;
- goto fail;
- }
- seteuid(lock_real_uid);
- } else {
- res = CAMEL_LOCK_HELPER_STATUS_SYSTEM;
- goto fail;
- }
- } else {
- res = CAMEL_LOCK_HELPER_STATUS_SYSTEM;
- goto fail;
- }
-#else
- res = CAMEL_LOCK_HELPER_STATUS_SYSTEM;
- goto fail;
-#endif
- } else {
- info->uid = lock_real_uid;
- }
-
- strcpy(info->path, path);
- info->id = lock_id;
- info->depth = 1;
- info->next = lock_info_list;
- info->stamp = time(0);
- lock_info_list = info;
-
- if (lockid)
- *lockid = lock_id;
-
- lock_id++;
-
- d(fprintf(stderr, "lock ok\n"));
-
- return res;
-fail:
- d(fprintf(stderr, "lock failed\n"));
-
- if (info)
- free(info);
-
- return res;
-}
-
-static int unlock_id(guint32 lockid)
-{
- struct _lock_info *info, *p;
-
- d(fprintf(stderr, "unlocking id '%d'\n", lockid));
-
- p = (struct _lock_info *)&lock_info_list;
- info = p->next;
- while (info) {
- if (info->id == lockid) {
- d(fprintf(stderr, "found id %d path '%s'\n", lockid, info->path));
- info->depth--;
- if (info->depth <= 0) {
-#ifdef SETEUID_SAVES
- if (info->uid != lock_real_uid) {
- seteuid(lock_root_uid);
- camel_unlock_dot(info->path);
- seteuid(lock_real_uid);
- } else
-#endif
- camel_unlock_dot(info->path);
-
- p->next = info->next;
- free(info);
- }
-
- return CAMEL_LOCK_HELPER_STATUS_OK;
- }
- p = info;
- info = info->next;
- }
-
- d(fprintf(stderr, "unknown id asked to be unlocked %d\n", lockid));
- return CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
-}
-
-static void lock_touch(const char *path)
-{
- char *name;
-
- /* we could also check that we haven't had our lock stolen from us here */
-
- name = alloca(strlen(path) + 10);
- sprintf(name, "%s.lock", path);
-
- d(fprintf(stderr, "Updating lock %s\n", name));
- utime(name, NULL);
-}
-
-static void setup_process(void)
-{
- struct sigaction sa;
- sigset_t sigset;
-
- /* ignore sigint/sigio */
- sa.sa_handler = SIG_IGN;
- sigemptyset (&sa.sa_mask);
- sa.sa_flags = 0;
-
- sigemptyset(&sigset);
- sigaddset(&sigset, SIGIO);
- sigaddset(&sigset, SIGINT);
- sigprocmask(SIG_UNBLOCK, &sigset, NULL);
-
- sigaction (SIGIO, &sa, NULL);
- sigaction (SIGINT, &sa, NULL);
-
- /* FIXME: add more sanity checks/setup here */
-
-#ifdef SETEUID_SAVES
- /* here we change to the real user id, this is probably not particularly
- portable so may need configure checks */
- lock_real_uid = getuid();
- lock_root_uid = geteuid();
- if (lock_real_uid != lock_root_uid)
- seteuid(lock_real_uid);
-#endif
-}
-
-int main(int argc, char **argv)
-{
- struct _CamelLockHelperMsg msg;
- int len;
- int res;
- char *path;
- fd_set rset;
- struct timeval tv;
- struct _lock_info *info;
-
- setup_process();
-
- do {
- /* do a poll/etc, so we can refresh the .locks as required ... */
- FD_ZERO(&rset);
- FD_SET(STDIN_FILENO, &rset);
-
- /* check the minimum timeout we need to refresh the next oldest lock */
- if (lock_info_list) {
- time_t now = time(0);
- time_t left;
- time_t delay = CAMEL_DOT_LOCK_REFRESH;
-
- info = lock_info_list;
- while (info) {
- left = CAMEL_DOT_LOCK_REFRESH - (now - info->stamp);
- left = MAX(left, 0);
- delay = MIN(left, delay);
- info = info->next;
- }
-
- tv.tv_sec = delay;
- tv.tv_usec = 0;
- }
-
- d(fprintf(stderr, "lock helper waiting for input\n"));
- if (select(STDIN_FILENO+1, &rset, NULL, NULL, lock_info_list?&tv:NULL) == -1) {
- if (errno == EINTR)
- break;
-
- continue;
- }
-
- /* did we get a timeout? scan for any locks that need updating */
- if (!FD_ISSET(STDIN_FILENO, &rset)) {
- time_t now = time(0);
- time_t left;
-
- d(fprintf(stderr, "Got a timeout, checking locks\n"));
-
- info = lock_info_list;
- while (info) {
- left = (now - info->stamp);
- if (left >= CAMEL_DOT_LOCK_REFRESH) {
- lock_touch(info->path);
- info->stamp = now;
- }
- info = info->next;
- }
-
- continue;
- }
-
-
- len = read_n(STDIN_FILENO, &msg, sizeof(msg));
- if (len == 0)
- break;
-
- res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
- if (len == sizeof(msg) && msg.magic == CAMEL_LOCK_HELPER_MAGIC) {
- switch(msg.id) {
- case CAMEL_LOCK_HELPER_LOCK:
- res = CAMEL_LOCK_HELPER_STATUS_NOMEM;
- path = malloc(msg.data+1);
- if (path != NULL) {
- res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
- len = read_n(STDIN_FILENO, path, msg.data);
- if (len == msg.data) {
- path[len] = 0;
- res = lock_path(path, &msg.data);
- }
- free(path);
- }
- break;
- case CAMEL_LOCK_HELPER_UNLOCK:
- res = unlock_id(msg.data);
- break;
- }
- }
- d(fprintf(stderr, "returning result %d\n", res));
- msg.id = res;
- msg.magic = CAMEL_LOCK_HELPER_RETURN_MAGIC;
- write_n(STDOUT_FILENO, &msg, sizeof(msg));
- } while (1);
-
- d(fprintf(stderr, "parent exited, clsoing down remaining id's\n"));
- while (lock_info_list)
- unlock_id(lock_info_list->id);
-
- return 0;
-}
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