diff options
Diffstat (limited to 'camel/camel-lock-helper.c')
| -rw-r--r-- | camel/camel-lock-helper.c | 390 |
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; -} |