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Ignore whitespace Rev 55 → Rev 56

/incron/tags/incron-0.3.0/ict-main.cpp
0,0 → 1,416
/// inotify cron table manipulator main file
/**
* \file ict-main.cpp
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#include <argp.h>
#include <pwd.h>
#include <string>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "incron.h"
#include "incrontab.h"
// #define INCRON_DEFAULT_EDITOR "nano" // for vim haters like me ;-)
#define INCRON_DEFAULT_EDITOR "vim"
const char* argp_program_version = INCRON_TAB_NAME " " INCRON_VERSION;
const char* argp_program_bug_address = INCRON_BUG_ADDRESS;
static char doc[] = "incrontab - incron table manipulator";
static char args_doc[] = "FILE";
static struct argp_option options[] = {
{"list", 'l', 0, 0, "List the current table" },
{"remove", 'r', 0, 0, "Remove the table completely" },
{"edit", 'e', 0, 0, "Edit the table" },
{"user", 'u', "USER", 0, "Override the current user" },
{ 0 }
};
/// incrontab operations
typedef enum
{
OPER_NONE, /// nothing
OPER_LIST, /// list table
OPER_REMOVE, /// remove table
OPER_EDIT /// edit table
} InCronTab_Operation_t;
/// incrontab arguments
struct arguments
{
char *user; /// user name
int oper; /// operation code
char *file; /// file to import
};
/// Parses the program options (arguments).
/**
* \param[in] key argument key (name)
* \param[in] arg argument value
* \param[out] state options setting
* \return 0 on success, ARGP_ERR_UNKNOWN on unknown argument(s)
*/
static error_t parse_opt(int key, char *arg, struct argp_state *state)
{
struct arguments* arguments = (struct arguments*) state->input;
switch (key) {
case 'l':
arguments->oper = OPER_LIST;
break;
case 'r':
arguments->oper = OPER_REMOVE;
break;
case 'e':
arguments->oper = OPER_EDIT;
break;
case 'u':
arguments->user = arg;
break;
case ARGP_KEY_ARG:
if (state->arg_num >= 1)
argp_usage(state);
arguments->file = arg;
break;
case ARGP_KEY_END:
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
/// Program arguments
static struct argp argp = { options, parse_opt, args_doc, doc };
/// Unlink a file with temporarily changed UID.
/**
* \param[in] file file to unlink
* \param[in] uid UID for unlink processing
*
* \attention No error checking is done!
*/
void unlink_suid(const char* file, uid_t uid)
{
uid_t iu = geteuid();
seteuid(uid);
if (unlink(file) != 0)
perror("cannot remove temporary file");
seteuid(iu);
}
/// Copies a file to an user table.
/**
* \param[in] path path to file
* \param[in] user user name
* \return true = success, false = failure
*/
bool copy_from_file(const char* path, const char* user)
{
InCronTab tab;
std::string s(path);
if (s == "-")
s = "/dev/stdin";
if (!tab.Load(s)) {
fprintf(stderr, "cannot load table from file: %s\n", path);
return false;
}
std::string out(InCronTab::GetUserTablePath(user));
if (!tab.Save(out)) {
fprintf(stderr, "cannot create table for user: %s\n", user);
return false;
}
return true;
}
/// Removes an user table.
/**
* \param[in] user user name
* \return true = success, false = failure
*/
bool remove_table(const char* user)
{
std::string tp(InCronTab::GetUserTablePath(user));
if (unlink(tp.c_str()) != 0 && errno != ENOENT) {
fprintf(stderr, "cannot remove table for user: %s\n", user);
return false;
}
return true;
}
/// Lists an user table.
/**
* \param[in] user user name
* \return true = success, false = failure
*
* \attention Listing is currently done through 'cat'.
*/
bool list_table(const char* user)
{
std::string tp(InCronTab::GetUserTablePath(user));
if (access(tp.c_str(), R_OK) != 0) {
if (errno == ENOENT) {
fprintf(stderr, "no table for %s\n", user);
return true;
}
else {
fprintf(stderr, "cannot read table for %s: %s\n", user, strerror(errno));
return false;
}
}
std::string cmd("cat ");
cmd.append(tp);
return system(cmd.c_str()) == 0;
}
/// Allows to edit an user table.
/**
* \param[in] user user name
* \return true = success, false = failure
*
* \attention This function is very complex and may contain
* various bugs including security ones. Please keep
* it in mind..
*/
bool edit_table(const char* user)
{
std::string tp(InCronTab::GetUserTablePath(user));
struct passwd* ppwd = getpwnam(user);
if (ppwd == NULL) {
fprintf(stderr, "cannot find user %s: %s\n", user, strerror(errno));
return false;
}
uid_t uid = ppwd->pw_uid;
char s[NAME_MAX];
strcpy(s, "/tmp/incron.table-XXXXXX");
uid_t iu = geteuid();
if (seteuid(uid) != 0) {
fprintf(stderr, "cannot change effective UID to %i: %s\n", (int) uid, strerror(errno));
return false;
}
int fd = mkstemp(s);
if (fd == -1) {
fprintf(stderr, "cannot create temporary file: %s\n", strerror(errno));
return false;
}
if (fchmod(fd, 0644) != 0) {
fprintf(stderr, "cannot change mode of temporary file: %s\n", strerror(errno));
close(fd);
unlink_suid(s, uid);
return false;
}
if (seteuid(iu) != 0) {
fprintf(stderr, "cannot change effective UID: %s\n", strerror(errno));
close(fd);
unlink_suid(s, uid);
return false;
}
FILE* out = fdopen(fd, "w");
if (out == NULL) {
fprintf(stderr, "cannot write to temporary file: %s\n", strerror(errno));
close(fd);
unlink_suid(s, uid);
return false;
}
FILE* in = fopen(tp.c_str(), "r");
if (in == NULL) {
if (errno == ENOENT) {
in = fopen("/dev/null", "r");
if (in == NULL) {
fprintf(stderr, "cannot get empty table for %s: %s\n", user, strerror(errno));
fclose(out);
unlink_suid(s, uid);
return false;
}
}
else {
fprintf(stderr, "cannot read old table for %s: %s\n", user, strerror(errno));
fclose(out);
unlink_suid(s, uid);
return false;
}
}
char buf[1024];
while (fgets(buf, 1024, in) != NULL) {
fputs(buf, out);
}
fclose(in);
fclose(out);
struct stat st;
if (stat(s, &st) != 0) {
fprintf(stderr, "cannot stat temporary file: %s\n", strerror(errno));
unlink_suid(s, uid);
return false;
}
time_t mt = st.st_mtime;
const char* e = getenv("EDITOR");
if (e == NULL)
e = INCRON_DEFAULT_EDITOR;
pid_t pid = fork();
if (pid == 0) {
if (setuid(uid) != 0) {
fprintf(stderr, "cannot set user %s: %s\n", user, strerror(errno));
return false;
}
execlp(e, e, s, NULL);
_exit(1);
}
else if (pid > 0) {
int status;
if (wait(&status) != pid) {
perror("error while waiting for editor");
unlink_suid(s, uid);
return false;
}
if (!(WIFEXITED(status)) || WEXITSTATUS(status) != 0) {
perror("editor finished with error");
unlink_suid(s, uid);
return false;
}
}
else {
perror("cannot start editor");
unlink_suid(s, uid);
return false;
}
if (stat(s, &st) != 0) {
fprintf(stderr, "cannot stat temporary file: %s\n", strerror(errno));
unlink_suid(s, uid);
return false;
}
if (st.st_mtime == mt) {
fprintf(stderr, "table unchanged\n");
unlink_suid(s, uid);
return true;
}
InCronTab ict;
if (!ict.Load(s) || !ict.Save(tp)) {
fprintf(stderr, "cannot move temporary table: %s\n", strerror(errno));
unlink(s);
return false;
}
fprintf(stderr, "table updated\n");
unlink_suid(s, uid);
return true;
}
int main(int argc, char** argv)
{
struct arguments arguments;
arguments.user = NULL;
arguments.oper = OPER_NONE;
arguments.file = NULL;
argp_parse (&argp, argc, argv, 0, 0, &arguments);
if (arguments.file != NULL && arguments.oper != OPER_NONE) {
fprintf(stderr, "invalid arguments - specify source file or operation\n");
return 1;
}
if (arguments.file == NULL && arguments.oper == OPER_NONE) {
fprintf(stderr, "invalid arguments - specify source file or operation\n");
return 1;
}
uid_t uid = getuid();
if (uid != 0 && arguments.user != NULL) {
fprintf(stderr, "cannot access table for user %s: permission denied\n", arguments.user);
return 1;
}
struct passwd pwd;
if (arguments.user == NULL) {
struct passwd* ppwd = getpwuid(uid);
if (ppwd == NULL) {
fprintf(stderr, "cannot determine current user\n");
return 1;
}
memcpy(&pwd, ppwd, sizeof(pwd));
arguments.user = pwd.pw_name;
}
else if (getpwnam(arguments.user) == NULL) {
fprintf(stderr, "user %s not found\n", arguments.user);
return 1;
}
if (!InCronTab::CheckUser(arguments.user)) {
fprintf(stderr, "user %s is not allowed to use incron\n", arguments.user);
return 1;
}
switch (arguments.oper) {
case OPER_NONE:
fprintf(stderr, "copying table from file: %s\n", arguments.file);
if (!copy_from_file(arguments.file, arguments.user))
return 1;
break;
case OPER_LIST:
if (!list_table(arguments.user))
return 1;
break;
case OPER_REMOVE:
fprintf(stderr, "removing table for user %s\n", arguments.user);
if (!remove_table(arguments.user))
return 1;
break;
case OPER_EDIT:
if (!edit_table(arguments.user))
return 1;
break;
default:
fprintf(stderr, "invalid usage\n");
return 1;
}
return 0;
}

/incron/tags/incron-0.3.0/CHANGELOG
0,0 → 1,34
0.3.0 2006-11-12
* based on inotify-cxx 0.5.2 (fixes a problem with ignoring IN_OPEN)
* two new special symbols ($% for flags as names, $& for numeric flags)
* whitespaces in paths now allowed (by prepending a backslash) (#0000098)
* some changes in logging etc.
0.2.3 2006-10-30
* problems with unwanted IN_NO_LOOP have been fixed (#0000097)
0.2.2 2006-10-29
* based on inotify-cxx 0.5.0
* 'uncleaned children' bug has been fixed (#0000095)
* memory leak (child process arguments) has been fixed (#0000096)
0.2.1 2006-10-14
* based on inotify-cxx 0.4.1 (it should also fix crashing as described in #0000085)
* build failure (due to missing 'useradd -M') on some distributions has been fixed
(#0000094)
* tarball structure has been fixed (#0000089)
* documentation slightly improved
0.2.0 2006-10-04
* based on inotify-cxx 0.3.1
* better signal handling (no "dirty" wait() in a handler)
* loop avoidance can be used
* more documentation in the code
0.1.0 2006-09-15
* first alpha version

/incron/tags/incron-0.3.0/README
0,0 → 1,105
inotify cron system
(c) Lukas Jelinek, 2006
1. About
2. Requirements
3. How to use
4. Bugs, suggestions
5. Licensing
6. Documentation
========================================================================
1. About
This program is the "inotify cron" system. It consist of a daemon and
a table manipulator. You can use it a similar way as the regular cron.
The difference is that the inotify cron handles filesystem events
rather than time periods.
2. Requirements
* Linux kernel 2.6.13 or later (with inotify compiled in)
* inotify headers (inotify.h, sometimes inotify-syscalls.h) installed in
<INCLUDE_DIR>/sys. The most common place is /usr/include/sys.
* GCC 4.x compiler (probably works also with GCC 3.4, possibly with
older versions too)
3. How to build
Because this version is very early it does not contain a standard
portable build mechanism. There is only a Makefile which must be
modified manually. On many Linux systems you need not to change
anything.
Please review the Makefile BEFORE you type 'make'. Especially
check the PREFIX and other common variables. If done you can
now build the files ('make').
The binaries must be of course installed as root. Note that the
installer creates a special user called 'incron' which manages
the incron tables.
4. How to use
The incron daemon (incrond) must be run under root (typically from
runlevel script etc.). It loads the current user tables and hooks
them for later changes.
The incron table manipulator may be run under any regular user
since it SUIDs. For manipulation with the tables use basically
the same syntax as for the crontab program. You can import a table,
remove and edit the current table.
The user table rows have the following syntax:
<path> <mask> <command>
Where:
<path> is a filesystem path (currently avoid whitespaces!)
<mask> is a symbolic (see inotify.h; use commas for separating
symbols) or numeric mask for events
<command> is an application or script to run on the events
The command may contain these wildcards:
$$ - a dollar sign
$@ - the watched filesystem path (see above)
$# - the event-related file name
$% - the event flags (textually)
$& - the event flags (numerically)
The mask may additionaly contain a special symbol IN_NO_LOOP which
disables events occurred during the event handling (to avoid loops).
Example 1: You need to run program 'abc' with the full file path as
an argument every time a file is changed in /var/mail. One of
the solutions follows:
/var/mail IN_CLOSE_WRITE abc $@/$#
Example 2: You need to run program 'efg' with the full file path as
the first argument and the numeric event flags as the second one.
It have to monitor all events on files in /tmp. Here is it:
/tmp IN_ALL_EVENTS efg $@/$# $&
5. Bugs, suggestions
THIS PROGRAM IS AN ALPHA VERSION. IT PROBABLY CONTAINS BUGS AND
THEREFORE IT IS NOT INTENDED FOR PRODUCTION USE.
If you find a bug or have a suggestion how to improve the program,
please use the bug tracking system at http://bts.aiken.cz.
6. Licensing
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License,
version 2 (see LICENSE-GPL).
Some parts may be also licensed covere by other licenses.
Please look into the source files for detailed information.

/incron/tags/incron-0.3.0/incrontab.cpp
0,0 → 1,220
/// inotify cron table manipulator classes implementation
/**
* \file incrontab.cpp
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#include <sstream>
#include <stdio.h>
#include <errno.h>
#include "inotify-cxx.h"
#include "incrontab.h"
/// Allowed users
#define INCRON_ALLOW_PATH "/etc/incron.allow"
/// Denied users
#define INCRON_DENY_PATH "/etc/incron.deny"
InCronTabEntry::InCronTabEntry()
: m_uMask(0),
m_fNoLoop(false)
{
}
InCronTabEntry::InCronTabEntry(const std::string& rPath, uint32_t uMask, const std::string& rCmd)
: m_path(rPath),
m_uMask(uMask),
m_cmd(rCmd)
{
}
std::string InCronTabEntry::ToString() const
{
std::ostringstream ss;
std::string m;
InotifyEvent::DumpTypes(m_uMask, m);
if (m.empty()) {
m = m_fNoLoop ? "IN_NO_LOOP" : "0";
}
else {
if (m_fNoLoop)
m.append(",IN_NO_LOOP");
}
ss << GetSafePath(m_path) << " " << m << " " << m_cmd;
return ss.str();
}
bool InCronTabEntry::Parse(const std::string& rStr, InCronTabEntry& rEntry)
{
unsigned long u;
std::string s1, s2, s3;
StringTokenizer tok(rStr, ' ', '\\');
if (!tok.HasMoreTokens())
return false;
s1 = tok.GetNextToken(true);
if (!tok.HasMoreTokens())
return false;
s2 = tok.GetNextToken(true);
if (!tok.HasMoreTokens())
return false;
tok.SetNoPrefix();
s3 = tok.GetRemainder();
SIZE len = s3.length();
if (len > 0 && s3[len-1] == '\n')
s3.resize(len-1);
rEntry.m_path = s1;
rEntry.m_cmd = s3;
rEntry.m_uMask = 0;
rEntry.m_fNoLoop = false;
if (sscanf(s2.c_str(), "%lu", &u) == 1) {
rEntry.m_uMask = (uint32_t) u;
}
else {
StringTokenizer tok(s2);
while (tok.HasMoreTokens()) {
std::string s(tok.GetNextToken());
if (s == "IN_NO_LOOP")
rEntry.m_fNoLoop = true;
else
rEntry.m_uMask |= InotifyEvent::GetMaskByName(s);
}
}
return true;
}
std::string InCronTabEntry::GetSafePath(const std::string& rPath)
{
std::ostringstream stream;
SIZE len = rPath.length();
for (SIZE i = 0; i < len; i++) {
if (rPath[i] == ' ') {
stream << "\\ ";
}
else if (rPath[i] == '\\') {
stream << "\\\\";
}
else {
stream << rPath[i];
}
}
return stream.str();
}
bool InCronTab::Load(const std::string& rPath)
{
m_tab.clear();
FILE* f = fopen(rPath.c_str(), "r");
if (f == NULL)
return false;
char s[1000];
InCronTabEntry e;
while (fgets(s, 1000, f) != NULL) {
if (InCronTabEntry::Parse(s, e)) {
m_tab.push_back(e);
}
}
fclose(f);
return true;
}
bool InCronTab::Save(const std::string& rPath)
{
FILE* f = fopen(rPath.c_str(), "w");
if (f == NULL)
return false;
std::deque<InCronTabEntry>::iterator it = m_tab.begin();
while (it != m_tab.end()) {
fputs((*it).ToString().c_str(), f);
fputs("\n", f);
it++;
}
fclose(f);
return true;
}
bool InCronTab::CheckUser(const std::string& rUser)
{
char s[100], u[100];
FILE* f = fopen(INCRON_ALLOW_PATH, "r");
if (f == NULL) {
if (errno == ENOENT) {
f = fopen(INCRON_DENY_PATH, "r");
if (f == NULL) {
return errno == ENOENT;
}
while (fgets(s, 100, f) != NULL) {
if (sscanf(s, "%s", u) == 1) {
if (rUser == u) {
fclose(f);
return false;
}
}
}
fclose(f);
return true;
}
return false;
}
while (fgets(s, 100, f) != NULL) {
if (sscanf(s, "%s", u) == 1) {
if (rUser == u) {
fclose(f);
return true;
}
}
}
fclose(f);
return false;
}
std::string InCronTab::GetUserTablePath(const std::string& rUser)
{
std::string s(INCRON_TABLE_BASE);
s.append(rUser);
return s;
}

/incron/tags/incron-0.3.0/inotify-cxx.cpp
0,0 → 1,510
/// inotify C++ interface implementation
/**
* \file inotify-cxx.cpp
*
* inotify C++ interface
*
* Copyright (C) 2006 Lukas Jelinek <lukas@aiken.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of one of the following licenses:
*
* \li 1. X11-style license (see LICENSE-X11)
* \li 2. GNU Lesser General Public License, version 2.1 (see LICENSE-LGPL)
* \li 3. GNU General Public License, version 2 (see LICENSE-GPL)
*
* If you want to help with choosing the best license for you,
* please visit http://www.gnu.org/licenses/license-list.html.
*
*/
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "inotify-cxx.h"
/// dump separator (between particular entries)
#define DUMP_SEP \
({ \
if (!rStr.empty()) { \
rStr.append(","); \
} \
})
int32_t InotifyEvent::GetDescriptor() const
{
return m_pWatch != NULL // if watch exists
? m_pWatch->GetDescriptor() // return its descriptor
: -1; // else return -1
}
uint32_t InotifyEvent::GetMaskByName(const std::string& rName)
{
if (rName == "IN_ACCESS")
return IN_ACCESS;
else if (rName == "IN_MODIFY")
return IN_MODIFY;
else if (rName == "IN_ATTRIB")
return IN_ATTRIB;
else if (rName == "IN_CLOSE_WRITE")
return IN_CLOSE_WRITE;
else if (rName == "IN_CLOSE_NOWRITE")
return IN_CLOSE_NOWRITE;
else if (rName == "IN_OPEN")
return IN_OPEN;
else if (rName == "IN_MOVED_FROM")
return IN_MOVED_FROM;
else if (rName == "IN_MOVED_TO")
return IN_MOVED_TO;
else if (rName == "IN_CREATE")
return IN_CREATE;
else if (rName == "IN_DELETE")
return IN_DELETE;
else if (rName == "IN_DELETE_SELF")
return IN_DELETE_SELF;
else if (rName == "IN_UNMOUNT")
return IN_UNMOUNT;
else if (rName == "IN_Q_OVERFLOW")
return IN_Q_OVERFLOW;
else if (rName == "IN_IGNORED")
return IN_IGNORED;
else if (rName == "IN_CLOSE")
return IN_CLOSE;
else if (rName == "IN_MOVE")
return IN_MOVE;
else if (rName == "IN_ISDIR")
return IN_ISDIR;
else if (rName == "IN_ONESHOT")
return IN_ONESHOT;
else if (rName == "IN_ALL_EVENTS")
return IN_ALL_EVENTS;
#ifdef IN_DONT_FOLLOW
else if (rName == "IN_DONT_FOLLOW")
return IN_DONT_FOLLOW;
#endif // IN_DONT_FOLLOW
#ifdef IN_ONLYDIR
else if (rName == "IN_ONLYDIR")
return IN_ONLYDIR;
#endif // IN_ONLYDIR
return (uint32_t) 0;
}
void InotifyEvent::DumpTypes(uint32_t uValue, std::string& rStr)
{
rStr = "";
if (IsType(uValue, IN_ALL_EVENTS)) {
rStr.append("IN_ALL_EVENTS");
}
else {
if (IsType(uValue, IN_ACCESS)) {
DUMP_SEP;
rStr.append("IN_ACCESS");
}
if (IsType(uValue, IN_MODIFY)) {
DUMP_SEP;
rStr.append("IN_MODIFY");
}
if (IsType(uValue, IN_ATTRIB)) {
DUMP_SEP;
rStr.append("IN_ATTRIB");
}
if (IsType(uValue, IN_CREATE)) {
DUMP_SEP;
rStr.append("IN_CREATE");
}
if (IsType(uValue, IN_DELETE)) {
DUMP_SEP;
rStr.append("IN_DELETE");
}
if (IsType(uValue, IN_DELETE_SELF)) {
DUMP_SEP;
rStr.append("IN_DELETE_SELF");
}
if (IsType(uValue, IN_OPEN)) {
DUMP_SEP;
rStr.append("IN_OPEN");
}
if (IsType(uValue, IN_CLOSE)) {
DUMP_SEP;
rStr.append("IN_CLOSE");
}
else {
if (IsType(uValue, IN_CLOSE_WRITE)) {
DUMP_SEP;
rStr.append("IN_CLOSE_WRITE");
}
if (IsType(uValue, IN_CLOSE_NOWRITE)) {
DUMP_SEP;
rStr.append("IN_CLOSE_NOWRITE");
}
}
if (IsType(uValue, IN_MOVE)) {
DUMP_SEP;
rStr.append("IN_MOVE");
}
else {
if (IsType(uValue, IN_MOVED_FROM)) {
DUMP_SEP;
rStr.append("IN_MOVED_FROM");
}
if (IsType(uValue, IN_MOVED_TO)) {
DUMP_SEP;
rStr.append("IN_MOVED_TO");
}
}
}
if (IsType(uValue, IN_UNMOUNT)) {
DUMP_SEP;
rStr.append("IN_UNMOUNT");
}
if (IsType(uValue, IN_Q_OVERFLOW)) {
DUMP_SEP;
rStr.append("IN_Q_OVERFLOW");
}
if (IsType(uValue, IN_IGNORED)) {
DUMP_SEP;
rStr.append("IN_IGNORED");
}
if (IsType(uValue, IN_ISDIR)) {
DUMP_SEP;
rStr.append("IN_ISDIR");
}
if (IsType(uValue, IN_ONESHOT)) {
DUMP_SEP;
rStr.append("IN_ONESHOT");
}
#ifdef IN_DONT_FOLLOW
if (IsType(uValue, IN_DONT_FOLLOW)) {
DUMP_SEP;
rStr.append("IN_DONT_FOLLOW");
}
#endif // IN_DONT_FOLLOW
#ifdef IN_ONLYDIR
if (IsType(uValue, IN_ONLYDIR)) {
DUMP_SEP;
rStr.append("IN_ONLYDIR");
}
#endif // IN_ONLYDIR
}
void InotifyEvent::DumpTypes(std::string& rStr) const
{
DumpTypes(m_uMask, rStr);
}
void InotifyWatch::SetMask(uint32_t uMask) throw (InotifyException)
{
IN_WRITE_BEGIN
if (m_wd != -1) {
int wd = inotify_add_watch(m_pInotify->GetDescriptor(), m_path.c_str(), uMask);
if (wd != m_wd) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("changing mask failed"), wd == -1 ? errno : EINVAL, this);
}
}
m_uMask = uMask;
IN_WRITE_END
}
void InotifyWatch::SetEnabled(bool fEnabled) throw (InotifyException)
{
IN_WRITE_BEGIN
if (fEnabled == m_fEnabled) {
IN_WRITE_END_NOTHROW
return;
}
if (m_pInotify != NULL) {
if (fEnabled) {
m_wd = inotify_add_watch(m_pInotify->GetDescriptor(), m_path.c_str(), m_uMask);
if (m_wd == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("enabling watch failed"), errno, this);
}
m_pInotify->m_watches.insert(IN_WATCH_MAP::value_type(m_wd, this));
}
else {
if (inotify_rm_watch(m_pInotify->GetDescriptor(), m_wd) != 0) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("disabling watch failed"), errno, this);
}
m_pInotify->m_watches.erase(m_wd);
m_wd = -1;
}
}
m_fEnabled = fEnabled;
IN_WRITE_END
}
Inotify::Inotify() throw (InotifyException)
{
IN_LOCK_INIT
m_fd = inotify_init();
if (m_fd == -1) {
IN_LOCK_DONE
throw InotifyException(IN_EXC_MSG("inotify init failed"), errno, NULL);
}
}
Inotify::~Inotify()
{
Close();
IN_LOCK_DONE
}
void Inotify::Close()
{
IN_WRITE_BEGIN
if (m_fd != -1) {
RemoveAll();
close(m_fd);
m_fd = -1;
}
IN_WRITE_END
}
void Inotify::Add(InotifyWatch* pWatch) throw (InotifyException)
{
IN_WRITE_BEGIN
// invalid descriptor - this case shouldn't occur - go away
if (m_fd == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("invalid file descriptor"), EBUSY, this);
}
// this path already watched - go away
if (FindWatch(pWatch->GetPath()) != NULL) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("path already watched"), EBUSY, this);
}
// for enabled watch
if (pWatch->IsEnabled()) {
// try to add watch to kernel
int wd = inotify_add_watch(m_fd, pWatch->GetPath().c_str(), pWatch->GetMask());
// adding failed - go away
if (wd == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("adding watch failed"), errno, this);
}
// this path already watched (but defined another way)
InotifyWatch* pW = FindWatch(wd);
if (pW != NULL) {
// try to recover old watch because it may be modified - then go away
if (inotify_add_watch(m_fd, pW->GetPath().c_str(), pW->GetMask()) < 0) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("watch collision detected and recovery failed"), errno, this);
}
else {
// recovery failed - go away
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("path already watched (but defined another way)"), EBUSY, this);
}
}
pWatch->m_wd = wd;
m_watches.insert(IN_WATCH_MAP::value_type(pWatch->m_wd, pWatch));
}
m_paths.insert(IN_WP_MAP::value_type(pWatch->m_path, pWatch));
pWatch->m_pInotify = this;
IN_WRITE_END
}
void Inotify::Remove(InotifyWatch* pWatch) throw (InotifyException)
{
IN_WRITE_BEGIN
// invalid descriptor - this case shouldn't occur - go away
if (m_fd == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("invalid file descriptor"), EBUSY, this);
}
// for enabled watch
if (pWatch->m_wd != -1) {
// removing watch failed - go away
if (inotify_rm_watch(m_fd, pWatch->m_wd) == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("removing watch failed"), errno, this);
}
m_watches.erase(pWatch->m_wd);
pWatch->m_wd = -1;
}
m_paths.erase(pWatch->m_path);
pWatch->m_pInotify = NULL;
IN_WRITE_END
}
void Inotify::RemoveAll()
{
IN_WRITE_BEGIN
IN_WP_MAP::iterator it = m_paths.begin();
while (it != m_paths.end()) {
InotifyWatch* pW = (*it).second;
if (pW->m_wd != -1) {
inotify_rm_watch(m_fd, pW->m_wd);
pW->m_wd = -1;
}
pW->m_pInotify = NULL;
it++;
}
m_watches.clear();
m_paths.clear();
IN_WRITE_END
}
void Inotify::WaitForEvents(bool fNoIntr) throw (InotifyException)
{
ssize_t len = 0;
do {
len = read(m_fd, m_buf, INOTIFY_BUFLEN);
} while (fNoIntr && len == -1 && errno == EINTR);
if (errno == EWOULDBLOCK)
return;
if (len < 0)
throw InotifyException(IN_EXC_MSG("reading events failed"), errno, this);
IN_WRITE_BEGIN
ssize_t i = 0;
while (i < len) {
struct inotify_event* pEvt = (struct inotify_event*) &m_buf[i];
InotifyWatch* pW = FindWatch(pEvt->wd);
if (pW != NULL) {
InotifyEvent evt(pEvt, pW);
m_events.push_back(evt);
}
i += INOTIFY_EVENT_SIZE + (ssize_t) pEvt->len;
}
IN_WRITE_END
}
bool Inotify::GetEvent(InotifyEvent* pEvt) throw (InotifyException)
{
if (pEvt == NULL)
throw InotifyException(IN_EXC_MSG("null pointer to event"), EINVAL, this);
IN_WRITE_BEGIN
bool b = !m_events.empty();
if (b) {
*pEvt = m_events.front();
m_events.pop_front();
}
IN_WRITE_END
return b;
}
bool Inotify::PeekEvent(InotifyEvent* pEvt) throw (InotifyException)
{
if (pEvt == NULL)
throw InotifyException(IN_EXC_MSG("null pointer to event"), EINVAL, this);
IN_READ_BEGIN
bool b = !m_events.empty();
if (b) {
*pEvt = m_events.front();
}
IN_READ_END
return b;
}
InotifyWatch* Inotify::FindWatch(int iDescriptor)
{
IN_READ_BEGIN
IN_WATCH_MAP::iterator it = m_watches.find(iDescriptor);
InotifyWatch* pW = it == m_watches.end() ? NULL : (*it).second;
IN_READ_END
return pW;
}
InotifyWatch* Inotify::FindWatch(const std::string& rPath)
{
IN_READ_BEGIN
IN_WP_MAP::iterator it = m_paths.find(rPath);
InotifyWatch* pW = it == m_paths.end() ? NULL : (*it).second;
IN_READ_END
return pW;
}
void Inotify::SetNonBlock(bool fNonBlock) throw (InotifyException)
{
IN_WRITE_BEGIN
if (m_fd == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("invalid file descriptor"), EBUSY, this);
}
int res = fcntl(m_fd, F_GETFL);
if (res == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("cannot get inotify flags"), errno, this);
}
if (fNonBlock) {
res |= O_NONBLOCK;
}
else {
res &= ~O_NONBLOCK;
}
if (fcntl(m_fd, F_SETFL, res) == -1) {
IN_WRITE_END_NOTHROW
throw InotifyException(IN_EXC_MSG("cannot set inotify flags"), errno, this);
}
IN_WRITE_END
}

/incron/tags/incron-0.3.0/icd-main.cpp
0,0 → 1,231
/// inotify cron daemon main file
/**
* \file icd-main.cpp
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#include <map>
#include <signal.h>
#include <wait.h>
#include <pwd.h>
#include <dirent.h>
#include <syslog.h>
#include <errno.h>
#include <sys/poll.h>
#include "inotify-cxx.h"
#include "incron.h"
#include "incrontab.h"
#include "usertable.h"
/// Daemon yes/no
#define DAEMON true
/// Logging options (console as fallback, log PID)
#define INCRON_LOG_OPTS (LOG_CONS | LOG_PID)
/// Logging facility (use CRON)
#define INCRON_LOG_FACIL LOG_CRON
/// User name to user table mapping definition
typedef std::map<std::string, UserTable*> SUT_MAP;
/// User name to user table mapping table
SUT_MAP g_ut;
/// Finish program yes/no
volatile bool g_fFinish = false;
/// Handles a signal.
/**
* For SIGTERM and SIGINT it sets the program finish variable.
*
* \param[in] signo signal number
*/
void on_signal(int signo)
{
if (signo == SIGTERM || signo == SIGINT)
g_fFinish = true;
}
/// Checks whether an user exists and has permission to use incron.
/**
* It searches for the given user name in the user database.
* If it failes it returns 'false'. Otherwise it checks
* permission files for this user (see InCronTab::CheckUser()).
*
* \param[in] user user name
* \return true = user has permission to use incron, false = otherwise
*
* \sa InCronTab::CheckUser()
*/
bool check_user(const char* user)
{
struct passwd* pw = getpwnam(user);
if (pw == NULL)
return false;
return InCronTab::CheckUser(user);
}
/// Attempts to load all user incron tables.
/**
* Loaded tables are registered for processing events.
*
* \param[in] pIn inotify object
* \param[in] pEd inotify event dispatcher
*
* \throw InotifyException thrown if base table directory cannot be read
*/
void load_tables(Inotify* pIn, EventDispatcher* pEd) throw (InotifyException)
{
DIR* d = opendir(INCRON_TABLE_BASE);
if (d == NULL)
throw InotifyException("cannot open table directory", errno);
syslog(LOG_NOTICE, "loading user tables");
struct dirent* pDe = NULL;
while ((pDe = readdir(d)) != NULL) {
std::string un(pDe->d_name);
if (pDe->d_type == DT_REG && un != "." && un != "..") {
if (check_user(pDe->d_name)) {
syslog(LOG_INFO, "loading table for user %s", pDe->d_name);
UserTable* pUt = new UserTable(pIn, pEd, un);
g_ut.insert(SUT_MAP::value_type(un, pUt));
pUt->Load();
}
else {
syslog(LOG_WARNING, "table for invalid user %s found (ignored)", pDe->d_name);
}
}
}
closedir(d);
}
/// Main application function.
/**
* \param[in] argc argument count
* \param[in] argv argument array
* \return 0 on success, 1 on error
*
* \attention In daemon mode, it finishes immediately.
*/
int main(int argc, char** argv)
{
openlog(INCRON_DAEMON_NAME, INCRON_LOG_OPTS, INCRON_LOG_FACIL);
syslog(LOG_NOTICE, "starting service (version %s, built on %s %s)", INCRON_VERSION, __DATE__, __TIME__);
try {
Inotify in;
in.SetNonBlock(true);
EventDispatcher ed(&in);
try {
load_tables(&in, &ed);
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "%s: (%i) %s", e.GetMessage().c_str(), err, strerror(err));
syslog(LOG_NOTICE, "stopping service");
closelog();
return 1;
}
signal(SIGTERM, on_signal);
signal(SIGINT, on_signal);
signal(SIGCHLD, on_signal);
if (DAEMON)
daemon(0, 0);
uint32_t wm = IN_CLOSE_WRITE | IN_DELETE | IN_MOVE | IN_DELETE_SELF | IN_UNMOUNT;
InotifyWatch watch(INCRON_TABLE_BASE, wm);
in.Add(watch);
syslog(LOG_NOTICE, "ready to process filesystem events");
InotifyEvent e;
struct pollfd pfd;
pfd.fd = in.GetDescriptor();
pfd.events = (short) POLLIN;
pfd.revents = (short) 0;
while (!g_fFinish) {
int res = poll(&pfd, 1, -1);
if (res > 0) {
in.WaitForEvents(true);
}
else if (res < 0) {
if (errno != EINTR)
throw InotifyException("polling failed", errno, NULL);
}
UserTable::FinishDone();
while (in.GetEvent(e)) {
if (e.GetWatch() == &watch) {
if (e.IsType(IN_DELETE_SELF) || e.IsType(IN_UNMOUNT)) {
syslog(LOG_CRIT, "base directory destroyed, exitting");
g_fFinish = true;
}
else if (!e.GetName().empty()) {
SUT_MAP::iterator it = g_ut.find(e.GetName());
if (it != g_ut.end()) {
UserTable* pUt = (*it).second;
if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
syslog(LOG_INFO, "table for user %s changed, reloading", e.GetName().c_str());
pUt->Dispose();
pUt->Load();
}
else if (e.IsType(IN_MOVED_FROM) || e.IsType(IN_DELETE)) {
syslog(LOG_INFO, "table for user %s destroyed, removing", e.GetName().c_str());
delete pUt;
g_ut.erase(it);
}
}
else if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
if (check_user(e.GetName().c_str())) {
syslog(LOG_INFO, "table for user %s created, loading", e.GetName().c_str());
UserTable* pUt = new UserTable(&in, &ed, e.GetName());
g_ut.insert(SUT_MAP::value_type(e.GetName(), pUt));
pUt->Load();
}
}
}
}
else {
ed.DispatchEvent(e);
}
}
}
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "*** unhandled exception occurred ***");
syslog(LOG_CRIT, " %s", e.GetMessage().c_str());
syslog(LOG_CRIT, " error: (%i) %s", err, strerror(err));
}
syslog(LOG_NOTICE, "stopping service");
closelog();
return 0;
}

/incron/tags/incron-0.3.0/incrontab.h
0,0 → 1,220
/// inotify cron table manipulator classes header
/**
* \file incrontab.h
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#ifndef _INCRONTAB_H_
#define _INCRONTAB_H_
#include <string>
#include <deque>
#include "strtok.h"
/// Incron table base directory
#define INCRON_TABLE_BASE "/var/spool/incron/"
/// Incron table entry class.
class InCronTabEntry
{
public:
/// Constructor.
/**
* Creates an empty entry for later use with Parse().
*
* \sa Parse()
*/
InCronTabEntry();
/// Constructor.
/**
* Creates an entry based on defined parameters.
*
* \param[in] rPath watched filesystem path
* \param[in] uMask event mask
* \param[in] rCmd command string
*/
InCronTabEntry(const std::string& rPath, uint32_t uMask, const std::string& rCmd);
/// Destructor.
~InCronTabEntry() {}
/// Converts the entry to string representation.
/**
* This method creates a string for use in a table file.
*
* \return string representation
*/
std::string ToString() const;
/// Parses a string and attempts to extract entry parameters.
/**
* \param[in] rStr parsed string
* \param[out] rEntry parametrized entry
* \return true = success, false = failure
*/
static bool Parse(const std::string& rStr, InCronTabEntry& rEntry);
/// Returns the watch filesystem path.
/**
* \return watch path
*/
inline const std::string& GetPath() const
{
return m_path;
}
/// Returns the event mask.
/**
* \return event mask
*/
inline int32_t GetMask() const
{
return m_uMask;
}
/// Returns the command string.
/**
* \return command string
*/
inline const std::string& GetCmd() const
{
return m_cmd;
}
/// Checks whether this entry has set loop-avoidance.
/**
* \return true = no loop, false = loop allowed
*/
inline bool IsNoLoop() const
{
return m_fNoLoop;
}
/// Add backslashes before spaces in the source path.
/**
* It also adds backslashes before all original backslashes
* of course.
*
* The source string is not modified and a copy is returned
* instead.
*
* This method is intended to be used for paths in user tables.
*
* \param[in] rPath path to be modified
* \return modified path
*/
static std::string GetSafePath(const std::string& rPath);
protected:
std::string m_path; ///< watch path
uint32_t m_uMask; ///< event mask
std::string m_cmd; ///< command string
bool m_fNoLoop; ///< no loop yes/no
};
/// Incron table class.
class InCronTab
{
public:
/// Constructor.
InCronTab() {}
/// Destructor.
~InCronTab() {}
/// Add an entry to the table.
/**
* \param[in] rEntry table entry
*/
inline void Add(const InCronTabEntry& rEntry)
{
m_tab.push_back(rEntry);
}
/// Removes all entries.
inline void Clear()
{
m_tab.clear();
}
/// Checks whether the table is empty.
/**
* \return true = empty, false = otherwise
*/
inline bool IsEmpty() const
{
return m_tab.empty();
}
/// Returns the count of entries.
/**
* \return count of entries
*/
inline int GetCount() const
{
return (int) m_tab.size();
}
/// Returns an entry.
/**
* \return reference to the entry for the given index
*
* \attention This method doesn't test index bounds. If you
* pass an invalid value the program may crash
* and/or behave unpredictible way!
*/
inline InCronTabEntry& GetEntry(int index)
{
return m_tab[index];
}
/// Loads the table.
/**
* \param[in] rPath path to a source table file
* \return true = success, false = failure
*/
bool Load(const std::string& rPath);
/// Saves the table.
/**
* \param[in] rPath path to a destination table file
* \return true = success, false = failure
*/
bool Save(const std::string& rPath);
/// Checks whether an user has permission to use incron.
/**
* \param[in] rUser user name
* \return true = permission OK, false = otherwise
*/
static bool CheckUser(const std::string& rUser);
/// Composes a path to an user incron table file.
/**
* \param[in] rUser user name
* \return path to the table file
*
* \attention No tests (existence, permission etc.) are done.
*/
static std::string GetUserTablePath(const std::string& rUser);
protected:
std::deque<InCronTabEntry> m_tab; ///< incron table
};
#endif //_INCRONTAB_H_

/incron/tags/incron-0.3.0/TODO
0,0 → 1,4
Currently pending tasks:
#0000101 - Temporary files not removed
#0000103 - User overriding doesn't work

/incron/tags/incron-0.3.0/strtok.cpp
0,0 → 1,140
/// string tokenizer implementation
/**
* \file strtok.cpp
*
* string tokenizer
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of one of the following licenses:
*
* \li 1. X11-style license (see LICENSE-X11)
* \li 2. GNU Lesser General Public License, version 2.1 (see LICENSE-LGPL)
* \li 3. GNU General Public License, version 2 (see LICENSE-GPL)
*
* If you want to help with choosing the best license for you,
* please visit http://www.gnu.org/licenses/license-list.html.
*
*/
#include <sstream>
#include "strtok.h"
StringTokenizer::StringTokenizer(const std::string& rStr, char cDelim, char cPrefix)
{
m_str = rStr;
m_cDelim = cDelim;
m_cPrefix = cPrefix;
m_pos = 0;
m_len = rStr.length();
}
std::string StringTokenizer::GetNextToken(bool fSkipEmpty)
{
std::string s;
do {
_GetNextToken(s, true);
} while (fSkipEmpty && s.empty() && m_pos < m_len);
return s;
}
std::string StringTokenizer::GetNextTokenRaw(bool fSkipEmpty)
{
std::string s;
do {
_GetNextToken(s, false);
} while (fSkipEmpty && s.empty() && m_pos < m_len);
return s;
}
std::string StringTokenizer::GetRemainder()
{
return m_cPrefix == '\0'
? m_str.substr(m_pos)
: StripPrefix(m_str.c_str() + m_pos, m_len - m_pos);
}
std::string StringTokenizer::StripPrefix(const char* s, SIZE cnt)
{
std::ostringstream stream;
SIZE pos = 0;
while (pos < cnt) {
if (s[pos] == m_cPrefix) {
if ((pos < cnt - 1) && s[pos+1] == m_cPrefix) {
stream << m_cPrefix;
pos++;
}
}
else {
stream << s[pos];
}
pos++;
}
return stream.str();
}
void StringTokenizer::_GetNextToken(std::string& rToken, bool fStripPrefix)
{
if (m_cPrefix == '\0') {
_GetNextTokenNoPrefix(rToken);
}
else {
_GetNextTokenWithPrefix(rToken);
if (fStripPrefix)
rToken = StripPrefix(rToken.c_str(), rToken.length());
}
}
void StringTokenizer::_GetNextTokenNoPrefix(std::string& rToken)
{
for (SIZE i=m_pos; i<m_len; i++) {
if (m_str[i] == m_cDelim) {
rToken = m_str.substr(m_pos, i - m_pos);
m_pos = i + 1;
return;
}
}
rToken = m_str.substr(m_pos);
m_pos = m_len;
}
void StringTokenizer::_GetNextTokenWithPrefix(std::string& rToken)
{
int pref = 0;
for (SIZE i=m_pos; i<m_len; i++) {
if (m_str[i] == m_cDelim) {
if (pref == 0) {
rToken = m_str.substr(m_pos, i - m_pos);
m_pos = i + 1;
return;
}
else {
pref = 0;
}
}
else if (m_str[i] == m_cPrefix) {
if (pref == 1)
pref = 0;
else
pref = 1;
}
else {
pref = 0;
}
}
rToken = m_str.substr(m_pos);
m_pos = m_len;
}

/incron/tags/incron-0.3.0/inotify-cxx.h
0,0 → 1,737
/// inotify C++ interface header
/**
* \file inotify-cxx.h
*
* inotify C++ interface
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of one of the following licenses:
*
* \li 1. X11-style license (see LICENSE-X11)
* \li 2. GNU Lesser General Public License, version 2.1 (see LICENSE-LGPL)
* \li 3. GNU General Public License, version 2 (see LICENSE-GPL)
*
* If you want to help with choosing the best license for you,
* please visit http://www.gnu.org/licenses/license-list.html.
*
*/
#ifndef _INOTIFYCXX_H_
#define _INOTIFYCXX_H_
#include <string>
#include <deque>
#include <map>
// Please ensure that the following headers take the right place
#include <sys/syscall.h>
#include <sys/inotify.h>
// Use this if syscalls not defined
#ifndef __NR_inotify_init
#include <sys/inotify-syscalls.h>
#endif // __NR_inotify_init
/// Event struct size
#define INOTIFY_EVENT_SIZE (sizeof(struct inotify_event))
/// Event buffer length
#define INOTIFY_BUFLEN (1024 * (INOTIFY_EVENT_SIZE + 16))
/// Helper macro for creating exception messages.
/**
* It prepends the message by the function name.
*/
#define IN_EXC_MSG(msg) (std::string(__PRETTY_FUNCTION__) + ": " + msg)
/// inotify-cxx thread safety
/**
* If this symbol is defined you can use this interface safely
* threaded applications. Remember that it slightly degrades
* performance.
*
* Even if INOTIFY_THREAD_SAFE is defined some classes stay
* unsafe. If you must use them (must you?) in more than one
* thread concurrently you need to implement explicite locking.
*
* You need not to define INOTIFY_THREAD_SAFE in that cases
* where the application is multithreaded but all the inotify
* infrastructure will be managed only in one thread. This is
* the recommended way.
*
* Locking may fail (it is very rare but not impossible). In this
* case an exception is thrown. But if unlocking fails in case
* of an error it does nothing (this failure is ignored).
*/
#ifdef INOTIFY_THREAD_SAFE
#include <pthread.h>
#define IN_LOCK_DECL mutable pthread_rwlock_t __m_lock;
#define IN_LOCK_INIT \
{ \
pthread_rwlockattr_t attr; \
int res = 0; \
if ((res = pthread_rwlockattr_init(&attr)) != 0) \
throw InotifyException(IN_EXC_MSG("cannot initialize lock attributes"), res, this); \
if ((res = pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP)) != 0) \
throw InotifyException(IN_EXC_MSG("cannot set lock kind"), res, this); \
if ((res = pthread_rwlock_init(&__m_lock, &attr)) != 0) \
throw InotifyException(IN_EXC_MSG("cannot initialize lock"), res, this); \
pthread_rwlockattr_destroy(&attr); \
}
#define IN_LOCK_DONE pthread_rwlock_destroy(&__m_lock);
#define IN_READ_BEGIN \
{ \
int res = pthread_rwlock_rdlock(&__m_lock); \
if (res != 0) \
throw InotifyException(IN_EXC_MSG("locking for reading failed"), res, (void*) this); \
}
#define IN_READ_END \
{ \
int res = pthread_rwlock_unlock(&__m_lock); \
if (res != 0) \
throw InotifyException(IN_EXC_MSG("unlocking failed"), res, (void*) this); \
}
#define IN_READ_END_NOTHROW pthread_rwlock_unlock(&__m_lock);
#define IN_WRITE_BEGIN \
{ \
int res = pthread_rwlock_wrlock(&__m_lock); \
if (res != 0) \
throw InotifyException(IN_EXC_MSG("locking for writing failed"), res, (void*) this); \
}
#define IN_WRITE_END IN_READ_END
#define IN_WRITE_END_NOTHROW IN_READ_END_NOTHROW
#else // INOTIFY_THREAD_SAFE
#define IN_LOCK_DECL
#define IN_LOCK_INIT
#define IN_LOCK_DONE
#define IN_READ_BEGIN
#define IN_READ_END
#define IN_READ_END_NOTHROW
#define IN_WRITE_BEGIN
#define IN_WRITE_END
#define IN_WRITE_END_NOTHROW
#endif // INOTIFY_THREAD_SAFE
// forward declaration
class InotifyWatch;
class Inotify;
/// Class for inotify exceptions
/**
* This class allows to acquire information about exceptional
* events. It makes easier to log or display error messages
* and to identify problematic code locations.
*
* Although this class is basically thread-safe it is not intended
* to be shared between threads.
*/
class InotifyException
{
public:
/// Constructor
/**
* \param[in] rMsg message
* \param[in] iErr error number (see errno.h)
* \param[in] pSrc source
*/
InotifyException(const std::string& rMsg = "", int iErr = 0, void* pSrc = NULL)
: m_msg(rMsg),
m_err(iErr)
{
m_pSrc = pSrc;
}
/// Returns the exception message.
/**
* \return message
*/
inline const std::string& GetMessage() const
{
return m_msg;
}
/// Returns the exception error number.
/**
* If not applicable this value is 0 (zero).
*
* \return error number (standardized; see errno.h)
*/
inline int GetErrorNumber() const
{
return m_err;
}
/// Returns the exception source.
/**
* \return source
*/
inline void* GetSource() const
{
return m_pSrc;
}
protected:
std::string m_msg; ///< message
int m_err; ///< error number
mutable void* m_pSrc; ///< source
};
/// inotify event class
/**
* It holds all information about inotify event and provides
* access to its particular values.
*
* This class is not (and is not intended to be) thread-safe
* and therefore it must not be used concurrently in multiple
* threads.
*/
class InotifyEvent
{
public:
/// Constructor.
/**
* Creates a plain event.
*/
InotifyEvent()
: m_uMask(0),
m_uCookie(0)
{
m_pWatch = NULL;
}
/// Constructor.
/**
* Creates an event based on inotify event data.
* For NULL pointers it works the same way as InotifyEvent().
*
* \param[in] pEvt event data
* \param[in] pWatch inotify watch
*/
InotifyEvent(const struct inotify_event* pEvt, InotifyWatch* pWatch)
: m_uMask(0),
m_uCookie(0)
{
if (pEvt != NULL) {
m_uMask = (uint32_t) pEvt->mask;
m_uCookie = (uint32_t) pEvt->cookie;
if (pEvt->name != NULL)
m_name = pEvt->name;
m_pWatch = pWatch;
}
else {
m_pWatch = NULL;
}
}
/// Destructor.
~InotifyEvent() {}
/// Returns the event watch descriptor.
/**
* \return watch descriptor
*
* \sa InotifyWatch::GetDescriptor()
*/
int32_t GetDescriptor() const;
/// Returns the event mask.
/**
* \return event mask
*
* \sa InotifyWatch::GetMask()
*/
inline uint32_t GetMask() const
{
return m_uMask;
}
/// Checks a value for the event type.
/**
* \param[in] uValue checked value
* \param[in] uType type which is checked for
* \return true = the value contains the given type, false = otherwise
*/
inline static bool IsType(uint32_t uValue, uint32_t uType)
{
return ((uValue & uType) != 0) && ((~uValue & uType) == 0);
}
/// Checks for the event type.
/**
* \param[in] uType type which is checked for
* \return true = event mask contains the given type, false = otherwise
*/
inline bool IsType(uint32_t uType) const
{
return IsType(m_uMask, uType);
}
/// Returns the event cookie.
/**
* \return event cookie
*/
inline uint32_t GetCookie() const
{
return m_uCookie;
}
/// Returns the event name length.
/**
* \return event name length
*/
inline uint32_t GetLength() const
{
return (uint32_t) m_name.length();
}
/// Returns the event name.
/**
* \return event name
*/
inline const std::string& GetName() const
{
return m_name;
}
/// Extracts the event name.
/**
* \param[out] rName event name
*/
inline void GetName(std::string& rName) const
{
rName = GetName();
}
/// Returns the source watch.
/**
* \return source watch
*/
inline InotifyWatch* GetWatch()
{
return m_pWatch;
}
/// Finds the appropriate mask for a name.
/**
* \param[in] rName mask name
* \return mask for name; 0 on failure
*/
static uint32_t GetMaskByName(const std::string& rName);
/// Fills the string with all types contained in an event mask value.
/**
* \param[in] uValue event mask value
* \param[out] rStr dumped event types
*/
static void DumpTypes(uint32_t uValue, std::string& rStr);
/// Fills the string with all types contained in the event mask.
/**
* \param[out] rStr dumped event types
*/
void DumpTypes(std::string& rStr) const;
private:
uint32_t m_uMask; ///< mask
uint32_t m_uCookie; ///< cookie
std::string m_name; ///< name
InotifyWatch* m_pWatch; ///< source watch
};
/// inotify watch class
/**
* It holds information about the inotify watch on a particular
* inode.
*
* If the INOTIFY_THREAD_SAFE is defined this class is thread-safe.
*/
class InotifyWatch
{
public:
/// Constructor.
/**
* Creates an inotify watch. Because this watch is
* inactive it has an invalid descriptor (-1).
*
* \param[in] rPath watched file path
* \param[in] uMask mask for events
* \param[in] fEnabled events enabled yes/no
*/
InotifyWatch(const std::string& rPath, int32_t uMask, bool fEnabled = true)
: m_path(rPath),
m_uMask(uMask),
m_wd((int32_t) -1),
m_fEnabled(fEnabled)
{
IN_LOCK_INIT
}
/// Destructor.
~InotifyWatch()
{
IN_LOCK_DONE
}
/// Returns the watch descriptor.
/**
* \return watch descriptor; -1 for inactive watch
*/
inline int32_t GetDescriptor() const
{
return m_wd;
}
/// Returns the watched file path.
/**
* \return file path
*/
inline const std::string& GetPath() const
{
return m_path;
}
/// Returns the watch event mask.
/**
* \return event mask
*/
inline uint32_t GetMask() const
{
return (uint32_t) m_uMask;
}
/// Sets the watch event mask.
/**
* If the watch is active (added to an instance of Inotify)
* this method may fail due to unsuccessful re-setting
* the watch in the kernel.
*
* \param[in] uMask event mask
*
* \throw InotifyException thrown if changing fails
*/
void SetMask(uint32_t uMask) throw (InotifyException);
/// Returns the appropriate inotify class instance.
/**
* \return inotify instance
*/
inline Inotify* GetInotify()
{
return m_pInotify;
}
/// Enables/disables the watch.
/**
* If the watch is active (added to an instance of Inotify)
* this method may fail due to unsuccessful re-setting
* the watch in the kernel.
*
* Re-setting the current state has no effect.
*
* \param[in] fEnabled set enabled yes/no
*
* \throw InotifyException thrown if enabling/disabling fails
*/
void SetEnabled(bool fEnabled) throw (InotifyException);
/// Checks whether the watch is enabled.
/**
* \return true = enables, false = disabled
*/
inline bool IsEnabled() const
{
return m_fEnabled;
}
private:
friend class Inotify;
std::string m_path; ///< watched file path
uint32_t m_uMask; ///< event mask
int32_t m_wd; ///< watch descriptor
Inotify* m_pInotify; ///< inotify object
bool m_fEnabled; ///< events enabled yes/no
IN_LOCK_DECL
};
/// Mapping from watch descriptors to watch objects.
typedef std::map<int32_t, InotifyWatch*> IN_WATCH_MAP;
/// Mapping from paths to watch objects.
typedef std::map<std::string, InotifyWatch*> IN_WP_MAP;
/// inotify class
/**
* It holds information about the inotify device descriptor
* and manages the event queue.
*
* If the INOTIFY_THREAD_SAFE is defined this class is thread-safe.
*/
class Inotify
{
public:
/// Constructor.
/**
* Creates and initializes an instance of inotify communication
* object (opens the inotify device).
*
* \throw InotifyException thrown if inotify isn't available
*/
Inotify() throw (InotifyException);
/// Destructor.
/**
* Calls Close() due to clean-up.
*/
~Inotify();
/// Removes all watches and closes the inotify device.
void Close();
/// Adds a new watch.
/**
* \param[in] pWatch inotify watch
*
* \throw InotifyException thrown if adding failed
*/
void Add(InotifyWatch* pWatch) throw (InotifyException);
/// Adds a new watch.
/**
* \param[in] rWatch inotify watch
*
* \throw InotifyException thrown if adding failed
*/
inline void Add(InotifyWatch& rWatch) throw (InotifyException)
{
Add(&rWatch);
}
/// Removes a watch.
/**
* If the given watch is not present it does nothing.
*
* \param[in] pWatch inotify watch
*
* \throw InotifyException thrown if removing failed
*/
void Remove(InotifyWatch* pWatch) throw (InotifyException);
/// Removes a watch.
/**
* If the given watch is not present it does nothing.
*
* \param[in] rWatch inotify watch
*
* \throw InotifyException thrown if removing failed
*/
inline void Remove(InotifyWatch& rWatch) throw (InotifyException)
{
Remove(&rWatch);
}
/// Removes all watches.
void RemoveAll();
/// Returns the count of watches.
/**
* This is the total count of all watches (regardless whether
* enabled or not).
*
* \return count of watches
*
* \sa GetEnabledCount()
*/
inline size_t GetWatchCount() const
{
IN_READ_BEGIN
size_t n = (size_t) m_paths.size();
IN_READ_END
return n;
}
/// Returns the count of enabled watches.
/**
* \return count of enabled watches
*
* \sa GetWatchCount()
*/
inline size_t GetEnabledCount() const
{
IN_READ_BEGIN
size_t n = (size_t) m_watches.size();
IN_READ_END
return n;
}
/// Waits for inotify events.
/**
* It waits until one or more events occur. When called
* in nonblocking mode it only retrieves occurred events
* to the internal queue and exits.
*
* \param[in] fNoIntr if true it re-calls the system call after a handled signal
*
* \throw InotifyException thrown if reading events failed
*
* \sa SetNonBlock()
*/
void WaitForEvents(bool fNoIntr = false) throw (InotifyException);
/// Returns the count of received and queued events.
/**
* This number is related to the events in the queue inside
* this object, not to the events pending in the kernel.
*
* \return count of events
*/
inline size_t GetEventCount()
{
IN_READ_BEGIN
size_t n = (size_t) m_events.size();
IN_READ_END
return n;
}
/// Extracts a queued inotify event.
/**
* The extracted event is removed from the queue.
* If the pointer is NULL it does nothing.
*
* \param[in,out] pEvt event object
*
* \throw InotifyException thrown if the provided pointer is NULL
*/
bool GetEvent(InotifyEvent* pEvt) throw (InotifyException);
/// Extracts a queued inotify event.
/**
* The extracted event is removed from the queue.
*
* \param[in,out] rEvt event object
*
* \throw InotifyException thrown only in very anomalous cases
*/
bool GetEvent(InotifyEvent& rEvt) throw (InotifyException)
{
return GetEvent(&rEvt);
}
/// Extracts a queued inotify event (without removing).
/**
* The extracted event stays in the queue.
* If the pointer is NULL it does nothing.
*
* \param[in,out] pEvt event object
*
* \throw InotifyException thrown if the provided pointer is NULL
*/
bool PeekEvent(InotifyEvent* pEvt) throw (InotifyException);
/// Extracts a queued inotify event (without removing).
/**
* The extracted event stays in the queue.
*
* \param[in,out] rEvt event object
*
* \throw InotifyException thrown only in very anomalous cases
*/
bool PeekEvent(InotifyEvent& rEvt) throw (InotifyException)
{
return PeekEvent(&rEvt);
}
/// Searches for a watch by a watch descriptor.
/**
* It tries to find a watch by the given descriptor.
*
* \param[in] iDescriptor watch descriptor
* \return pointer to a watch; NULL if no such watch exists
*/
InotifyWatch* FindWatch(int iDescriptor);
/// Searches for a watch by a filesystem path.
/**
* It tries to find a watch by the given filesystem path.
*
* \param[in] rPath filesystem path
* \return pointer to a watch; NULL if no such watch exists
*
* \attention The path must be exactly identical to the one
* used for the searched watch. Be careful about
* absolute/relative and case-insensitive paths.
*/
InotifyWatch* FindWatch(const std::string& rPath);
/// Returns the file descriptor.
/**
* The descriptor can be used in standard low-level file
* functions (poll(), select(), fcntl() etc.).
*
* \return valid file descriptor or -1 for inactive object
*
* \sa SetNonBlock()
*/
inline int GetDescriptor() const
{
return m_fd;
}
/// Enables/disables non-blocking mode.
/**
* Use this mode if you want to monitor the descriptor
* (acquired thru GetDescriptor()) in functions such as
* poll(), select() etc.
*
* \param[in] fNonBlock enable/disable non-blocking mode
*
* \throw InotifyException thrown if setting mode failed
*
* \sa GetDescriptor()
*/
void SetNonBlock(bool fNonBlock) throw (InotifyException);
private:
int m_fd; ///< file descriptor
IN_WATCH_MAP m_watches; ///< watches (by descriptors)
IN_WP_MAP m_paths; ///< watches (by paths)
unsigned char m_buf[INOTIFY_BUFLEN]; ///< buffer for events
std::deque<InotifyEvent> m_events; ///< event queue
IN_LOCK_DECL
friend class InotifyWatch;
};
#endif //_INOTIFYCXX_H_

/incron/tags/incron-0.3.0/usertable.cpp
0,0 → 1,305
/// inotify cron daemon user tables implementation
/**
* \file usertable.cpp
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#include <pwd.h>
#include <syslog.h>
#include <errno.h>
#include <sys/wait.h>
#include "usertable.h"
PROC_LIST UserTable::s_procList;
void on_proc_done(InotifyWatch* pW)
{
pW->SetEnabled(true);
}
EventDispatcher::EventDispatcher(Inotify* pIn)
{
m_pIn = pIn;
}
void EventDispatcher::DispatchEvent(InotifyEvent& rEvt)
{
if (m_pIn == NULL)
return;
InotifyWatch* pW = rEvt.GetWatch();
if (pW == NULL)
return;
UserTable* pT = FindTable(pW);
if (pT == NULL)
return;
pT->OnEvent(rEvt);
}
void EventDispatcher::Register(InotifyWatch* pWatch, UserTable* pTab)
{
if (pWatch != NULL && pTab != NULL)
m_maps.insert(IWUT_MAP::value_type(pWatch, pTab));
}
void EventDispatcher::Unregister(InotifyWatch* pWatch)
{
IWUT_MAP::iterator it = m_maps.find(pWatch);
if (it == m_maps.end())
m_maps.erase(it);
}
void EventDispatcher::UnregisterAll(UserTable* pTab)
{
IWUT_MAP::iterator it = m_maps.begin();
while (it != m_maps.end()) {
if ((*it).second == pTab) {
IWUT_MAP::iterator it2 = it;
it++;
m_maps.erase(it2);
}
else {
it++;
}
}
}
UserTable* EventDispatcher::FindTable(InotifyWatch* pW)
{
IWUT_MAP::iterator it = m_maps.find(pW);
if (it == m_maps.end())
return NULL;
return (*it).second;
}
UserTable::UserTable(Inotify* pIn, EventDispatcher* pEd, const std::string& rUser)
: m_user(rUser)
{
m_pIn = pIn;
m_pEd = pEd;
}
UserTable::~UserTable()
{
Dispose();
}
void UserTable::Load()
{
m_tab.Load(InCronTab::GetUserTablePath(m_user));
int cnt = m_tab.GetCount();
for (int i=0; i<cnt; i++) {
InCronTabEntry& rE = m_tab.GetEntry(i);
InotifyWatch* pW = new InotifyWatch(rE.GetPath(), rE.GetMask());
try {
m_pIn->Add(pW);
m_pEd->Register(pW, this);
m_map.insert(IWCE_MAP::value_type(pW, &rE));
} catch (InotifyException e) {
syslog(LOG_ERR, "cannot create watch for user %s", m_user.c_str());
delete pW;
}
}
}
void UserTable::Dispose()
{
IWCE_MAP::iterator it = m_map.begin();
while (it != m_map.end()) {
InotifyWatch* pW = (*it).first;
m_pEd->Unregister(pW);
m_pIn->Remove(pW);
delete pW;
it++;
}
m_map.clear();
}
void UserTable::OnEvent(InotifyEvent& rEvt)
{
InotifyWatch* pW = rEvt.GetWatch();
InCronTabEntry* pE = FindEntry(pW);
if (pE == NULL)
return;
std::string cmd;
const std::string& cs = pE->GetCmd();
size_t pos = 0;
size_t oldpos = 0;
size_t len = cs.length();
while ((pos = cs.find('$', oldpos)) != std::string::npos) {
if (pos < len - 1) {
size_t px = pos + 1;
if (cs[px] == '$') {
cmd.append(cs.substr(oldpos, pos-oldpos+1));
oldpos = pos + 2;
}
else {
cmd.append(cs.substr(oldpos, pos-oldpos));
if (cs[px] == '@') { // base path
cmd.append(pW->GetPath());
oldpos = pos + 2;
}
else if (cs[px] == '#') { // file name
cmd.append(rEvt.GetName());
oldpos = pos + 2;
}
else if (cs[px] == '%') { // mask symbols
std::string s;
rEvt.DumpTypes(s);
cmd.append(s);
oldpos = pos + 2;
}
else if (cs[px] == '&') { // numeric mask
char* s;
asprintf(&s, "%u", (unsigned) rEvt.GetMask());
cmd.append(s);
free(s);
oldpos = pos + 2;
}
else {
oldpos = pos + 1;
}
}
}
else {
cmd.append(cs.substr(oldpos, pos-oldpos));
oldpos = pos + 1;
}
}
cmd.append(cs.substr(oldpos));
int argc;
char** argv;
if (!PrepareArgs(cmd, argc, argv)) {
syslog(LOG_ERR, "cannot prepare command arguments");
return;
}
syslog(LOG_INFO, "(%s) CMD (%s)", m_user.c_str(), cmd.c_str());
if (pE->IsNoLoop())
pW->SetEnabled(false);
ProcData_t pd;
pd.pid = fork();
if (pd.pid == 0) {
struct passwd* pwd = getpwnam(m_user.c_str());
if ( pwd == NULL // user not found
|| setuid(pwd->pw_uid) != 0 // setting UID failed
|| execvp(argv[0], argv) != 0) // exec failed
{
_exit(1);
}
}
else if (pd.pid > 0) {
if (pE->IsNoLoop()) {
pd.onDone = on_proc_done;
pd.pWatch = pW;
}
else {
pd.onDone = NULL;
pd.pWatch = NULL;
}
s_procList.push_back(pd);
}
else {
if (pE->IsNoLoop())
pW->SetEnabled(true);
syslog(LOG_ERR, "cannot fork process: %s", strerror(errno));
}
CleanupArgs(argc, argv);
}
InCronTabEntry* UserTable::FindEntry(InotifyWatch* pWatch)
{
IWCE_MAP::iterator it = m_map.find(pWatch);
if (it == m_map.end())
return NULL;
return (*it).second;
}
bool UserTable::PrepareArgs(const std::string& rCmd, int& argc, char**& argv)
{
if (rCmd.empty())
return false;
StringTokenizer tok(rCmd, ' ', '\\');
std::deque<std::string> args;
while (tok.HasMoreTokens()) {
args.push_back(tok.GetNextToken());
}
if (args.empty())
return false;
argc = (int) args.size();
argv = new char*[argc+1];
argv[argc] = NULL;
for (int i=0; i<argc; i++) {
const std::string& s = args[i];
size_t len = s.length();
argv[i] = new char[len+1];
strcpy(argv[i], s.c_str());
}
return true;
}
void UserTable::CleanupArgs(int argc, char** argv)
{
for (int i=0; i<argc; i++) {
delete[] argv[i];
}
delete[] argv;
}
void UserTable::FinishDone()
{
PROC_LIST::iterator it = s_procList.begin();
while (it != s_procList.end()) {
ProcData_t& pd = *it;
int status = 0;
int res = waitpid(pd.pid, &status, WNOHANG);
if (res == pd.pid && (WIFEXITED(status) || WIFSIGNALED(status))) {
if (pd.onDone != NULL)
(*pd.onDone)(pd.pWatch);
it = s_procList.erase(it);
}
else {
it++;
}
}
}

/incron/tags/incron-0.3.0/strtok.h
0,0 → 1,231
/// string tokenizer header
/**
* \file strtok.h
*
* string tokenizer
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of one of the following licenses:
*
* \li 1. X11-style license (see LICENSE-X11)
* \li 2. GNU Lesser General Public License, version 2.1 (see LICENSE-LGPL)
* \li 3. GNU General Public License, version 2 (see LICENSE-GPL)
*
* If you want to help with choosing the best license for you,
* please visit http://www.gnu.org/licenses/license-list.html.
*
*/
#ifndef _STRTOK_H_
#define _STRTOK_H_
#include <string>
typedef std::string::size_type SIZE;
/// Simple string tokenizer class.
/**
* This class implements a string tokenizer. It splits a string
* by a character to a number of elements (tokens) which are
* provided sequentially.
*
* All operations are made on a copy of the original string
* (which may be in fact a copy-on-write instance).
*
* The original string is left unchanged. All tokens are returned
* as newly created strings.
*
* There is possibility to specify a prefix character which
* causes the consecutive character is not considered as
* a delimiter. If you don't specify this character (or specify
* the NUL character, 0x00) this feature is disabled. The mostly
* used prefix is a backslash ('\').
*
* This class is not thread-safe.
*
* Performance note: This class is currently not intended
* to be very fast. Speed optimizations will be done later.
*/
class StringTokenizer
{
public:
/// Constructor.
/**
* Creates a ready-to-use tokenizer.
*
* \param[in] rStr string for tokenizing
* \param[in] cDelim delimiter (separator) character
* \param[in] cPrefix character which is prepended if a
* character must not separate tokens
*/
StringTokenizer(const std::string& rStr, char cDelim = ',', char cPrefix = '\0');
/// Destructor.
~StringTokenizer() {}
/// Checks whether the tokenizer can provide more tokens.
/**
* \return true = more tokens available, false = otherwise
*/
inline bool HasMoreTokens() const
{
return m_pos < m_len;
}
/// Returns the next token.
/**
* If a prefix is defined it is stripped from the returned
* string (e.g. 'abc\ def' is transformed to 'abc def'
* while the prefix is '\').
*
* \param[in] fSkipEmpty skip empty strings (more consecutive delimiters)
* \return next token or "" if no more tokens available
*
* \sa GetNextTokenRaw()
*/
std::string GetNextToken(bool fSkipEmpty = false);
/// Returns the next token.
/**
* This method always returns an unmodified string even
* if it contains prefix characters.
*
* \param[in] fSkipEmpty skip empty strings (more consecutive delimiters)
* \return next token or "" if no more tokens available
*
* \sa GetNextToken()
*/
std::string GetNextTokenRaw(bool fSkipEmpty = false);
/// Returns the remainder of the source string.
/**
* This method returns everything what has not been
* processed (tokenized) yet and moves the current
* position to the end of the string.
*
* If a prefix is defined it is stripped from
* the returned string.
*
* \return remainder string
*/
std::string GetRemainder();
/// Sets a delimiter (separator) character.
/**
* The new delimiter has effect only to tokens returned later;
* the position in the string is not affected.
*
* If you specify a NUL character (0x00) here the prefix
* will not be used.
*
* \param[in] cDelim delimiter character
*/
inline void SetDelimiter(char cDelim)
{
m_cDelim = cDelim;
}
/// Returns the delimiter (separator) character.
/**
* \return delimiter character
*/
inline char GetDelimiter() const
{
return m_cDelim;
}
/// Sets a prefix character.
/**
* The new prefix has effect only to tokens returned later;
* the position in the string is not affected.
*
* \param[in] cPrefix prefix character
*
* \sa SetNoPrefix()
*/
inline void SetPrefix(char cPrefix)
{
m_cPrefix = cPrefix;
}
/// Returns the prefix character.
/**
* \return prefix character
*/
inline char GetPrefix() const
{
return m_cPrefix;
}
/// Sets the prefix to 'no prefix'.
/**
* Calling this method is equivalent to SetPrefix((char) 0).
*
* \sa SetPrefix()
*/
inline void SetNoPrefix()
{
SetPrefix('\0');
}
/// Resets the tokenizer.
/**
* Re-initializes tokenizing to the start of the string.
*/
inline void Reset()
{
m_pos = 0;
}
private:
std::string m_str; ///< tokenized string
char m_cDelim; ///< delimiter character
char m_cPrefix; ///< prefix character
std::string::size_type m_pos; ///< current position
std::string::size_type m_len; ///< string length
/// Strips all prefix characters.
/**
* \param[in] s source string
* \param[in] cnt string length
* \return modified string
*/
std::string StripPrefix(const char* s, SIZE cnt);
/// Extracts the next token (internal method).
/**
* The extracted token may be empty.
*
* \param[out] rToken extracted token
* \param[in] fStripPrefix strip prefix characters yes/no
*/
void _GetNextToken(std::string& rToken, bool fStripPrefix);
/// Extracts the next token (internal method).
/**
* This method does no checking about the prefix character.
*
* The extracted token may be empty.
*
* \param[out] rToken extracted token
*/
void _GetNextTokenNoPrefix(std::string& rToken);
/// Extracts the next token (internal method).
/**
* This method does checking about the prefix character.
*
* The extracted token may be empty.
*
* \param[out] rToken extracted token
*/
void _GetNextTokenWithPrefix(std::string& rToken);
};
#endif //_STRTOK_H_

/incron/tags/incron-0.3.0/Makefile
0,0 → 1,65
PREFIX = /usr/local
DATADIR = /var/spool/incron
USER = incron
CXX = g++
INSTALL = install
OPTIMIZE = -O2
DEBUG = -g0
WARNINGS = -Wall
CPPFLAGS =
CXXFLAGS = $(OPTIMIZE) $(DEBUG) $(WARNINGS)
LDFLAGS = $(WARNINGS)
PROGRAMS = incrond incrontab
INCROND_OBJ = icd-main.o incrontab.o inotify-cxx.o usertable.o strtok.o
INCRONTAB_OBJ = ict-main.o incrontab.o inotify-cxx.o strtok.o
all: $(PROGRAMS)
incrond: $(INCROND_OBJ)
$(CXX) $(LDFLAGS) -o $@ $(INCROND_OBJ)
incrontab: $(INCRONTAB_OBJ)
$(CXX) $(LDFLAGS) -o $@ $(INCRONTAB_OBJ)
.cpp.o:
$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) -o $@ $<
clean:
rm -f $(PROGRAMS)
rm -f *.o
distclean: clean
install: all
[ -d $(PREFIX) ]
useradd -M -s /sbin/nologin $(USER) || useradd -s /sbin/nologin $(USER)
$(INSTALL) -m 04755 -o $(USER) incrontab $(PREFIX)/bin/
$(INSTALL) -m 0755 incrond $(PREFIX)/sbin/
$(INSTALL) -m 0755 -o $(USER) -d $(DATADIR)
uninstall:
[ -d $(PREFIX) ]
rm -f $(PREFIX)/bin/incrontab
rm -f $(PREFIX)/sbin/incrond
userdel $(USER)
.PHONY: all clean distclean install uninstall
.POSIX:
icd-main.o: icd-main.cpp inotify-cxx.h incrontab.h usertable.h incron.h
incrontab.o: incrontab.cpp incrontab.h inotify-cxx.h strtok.h
inotify-cxx.o: inotify-cxx.cpp inotify-cxx.h
usertable.o: usertable.cpp usertable.h strtok.h
ict-main.o: ict-main.cpp incrontab.h incron.h
strtok.o: strtok.cpp strtok.h

/incron/tags/incron-0.3.0/incron.h
0,0 → 1,36
/// inotify cron basic definition file
/**
* \file incron.h
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#ifndef _INCRON_H_
#define _INCRON_H_
/// Common application name
#define INCRON_NAME "incron"
/// Daemon name
#define INCRON_DAEMON_NAME "incrond"
/// Table manipulator name
#define INCRON_TAB_NAME "incrontab"
/// Application version (release)
#define INCRON_VERSION "0.3.0"
/// Address for sending bugs
#define INCRON_BUG_ADDRESS "<bugs@aiken.cz>"
#endif //_INCRON_H_

/incron/tags/incron-0.3.0/LICENSE-X11
0,0 → 1,22
Copyright (c) 2006 Lukas Jelinek
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

/incron/tags/incron-0.3.0/usertable.h
0,0 → 1,183
/// inotify cron daemon user tables header
/**
* \file usertable.h
*
* inotify cron system
*
* Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
*
* This program is free software; you can use it, redistribute
* it and/or modify it under the terms of the GNU General Public
* License, version 2 (see LICENSE-GPL).
*
*/
#ifndef _USERTABLE_H_
#define _USERTABLE_H_
#include <map>
#include <deque>
#include "inotify-cxx.h"
#include "incrontab.h"
class UserTable;
/// Callback for calling after a process finishes.
typedef void (*proc_done_cb)(InotifyWatch*);
/// Child process data
typedef struct
{
pid_t pid; ///< PID
proc_done_cb onDone; ///< function called after process finishes
InotifyWatch* pWatch; ///< related watch
} ProcData_t;
/// Watch-to-usertable mapping
typedef std::map<InotifyWatch*, UserTable*> IWUT_MAP;
/// Watch-to-tableentry mapping
typedef std::map<InotifyWatch*, InCronTabEntry*> IWCE_MAP;
/// Child process list
typedef std::deque<ProcData_t> PROC_LIST;
/// Event dispatcher class.
/**
* This class distributes inotify events to appropriate user tables.
*/
class EventDispatcher
{
public:
/// Constructor.
/**
* \param[in] pIn inotify object
*/
EventDispatcher(Inotify* pIn);
/// Destructor.
~EventDispatcher() {}
/// Dispatches an event.
/**
* \param[in] rEvt inotify event
*/
void DispatchEvent(InotifyEvent& rEvt);
/// Registers a watch for an user table.
/**
* \param[in] pWatch inotify watch
* \param[in] pTab user table
*/
void Register(InotifyWatch* pWatch, UserTable* pTab);
/// Unregisters a watch.
/**
* \param[in] pWatch inotify watch
*/
void Unregister(InotifyWatch* pWatch);
/// Unregisters all watches for an user table.
/**
* \param[in] pTab user table
*/
void UnregisterAll(UserTable* pTab);
private:
Inotify* m_pIn; ///< inotify object
IWUT_MAP m_maps; ///< watch-to-usertable mapping
/// Finds an user table for a watch.
/**
* \param[in] pW inotify watch
* \return pointer to the appropriate watch; NULL if no such watch exists
*/
UserTable* FindTable(InotifyWatch* pW);
};
/// User table class.
/**
* This class processes inotify events for an user. It creates
* child processes which do appropriate actions as defined
* in the user table file.
*/
class UserTable
{
public:
/// Constructor.
/**
* \param[in] pIn inotify object
* \param[in] pEd event dispatcher
* \param[in] rUser user name
*/
UserTable(Inotify* pIn, EventDispatcher* pEd, const std::string& rUser);
/// Destructor.
virtual ~UserTable();
/// Loads the table.
/**
* All loaded entries have their inotify watches and are
* registered for event dispatching.
* If loading fails the table remains empty.
*/
void Load();
/// Removes all entries from the table.
/**
* All entries are unregistered from the event dispatcher and
* their watches are destroyed.
*/
void Dispose();
/// Processes an inotify event.
/**
* \param[in] rEvt inotify event
*/
void OnEvent(InotifyEvent& rEvt);
/// Cleans-up all zombie child processes and enables disabled watches.
/**
* \attention This method must be called AFTER processing all events
* which has been caused by the processes.
*/
static void FinishDone();
private:
Inotify* m_pIn; ///< inotify object
EventDispatcher* m_pEd; ///< event dispatcher
std::string m_user; ///< user name
InCronTab m_tab; ///< incron table
IWCE_MAP m_map; ///< watch-to-entry mapping
static PROC_LIST s_procList; ///< child process list
/// Finds an entry for a watch.
/**
* \param[in] pWatch inotify watch
* \return pointer to the appropriate entry; NULL if no such entry exists
*/
InCronTabEntry* FindEntry(InotifyWatch* pWatch);
/// Prepares arguments for creating a child process.
/**
* \param[in] rCmd command string
* \param[out] argc argument count
* \param[out] argv argument array
* \return true = success, false = failure
*/
bool PrepareArgs(const std::string& rCmd, int& argc, char**& argv);
/// Frees memory allocated for arguments.
/**
* \param[in] argc argument count
* \param[in] argv argument array
*/
void CleanupArgs(int argc, char** argv);
};
#endif //_USERTABLE_H_

/incron/tags/incron-0.3.0/LICENSE-GPL
0,0 → 1,339
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
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notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
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when run, you must cause it, when started running for such
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These requirements apply to the modified work as a whole. If
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except as expressly provided under this License. Any attempt
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NO WARRANTY
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REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
Appendix: How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) 19yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

/incron/tags/incron-0.3.0/COPYING
0,0 → 1,11
inotify cron system
Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License,
version 2 (see LICENSE-GPL).
The program uses some parts covered also by other licenses.
Please look into the source files for detailed information.

/incron/tags/incron-0.3.0/LICENSE-LGPL
0,0 → 1,504
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts
as the successor of the GNU Library Public License, version 2, hence
the version number 2.1.]
Preamble
The licenses for most software are designed to take away your
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When we speak of free software, we are referring to freedom of use,
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GNU LESSER GENERAL PUBLIC LICENSE
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
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To apply these terms, attach the following notices to the library. It is
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"copyright" line and a pointer to where the full notice is found.
<one line to give the library's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!