Subversion Repositories public

Rev

Rev 47 | Rev 51 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
45 luk 1
 
2
/// inotify cron daemon main file
3
/**
4
 * \file icd-main.cpp
5
 *
6
 * inotify cron system
7
 *
8
 * Copyright (C) 2006 Lukas Jelinek, <lukas@aiken.cz>
9
 *
10
 * This program is free software; you can use it, redistribute
11
 * it and/or modify it under the terms of the GNU General Public
12
 * License, version 2 (see LICENSE-GPL).
13
 *  
14
 */
15
 
16
#include <map>
17
#include <signal.h>
18
#include <wait.h>
19
#include <pwd.h>
20
#include <dirent.h>
21
#include <syslog.h>
22
#include <errno.h>
47 luk 23
#include <sys/poll.h>
45 luk 24
 
25
#include "inotify-cxx.h"
26
#include "incrontab.h"
27
 
28
#include "usertable.h"
29
 
49 luk 30
/// Daemon yes/no
47 luk 31
#define DAEMON true
45 luk 32
 
49 luk 33
/// Application name
45 luk 34
#define INCRON_APP_NAME "incrond"
49 luk 35
 
36
/// Logging options (console as fallback, log PID)
45 luk 37
#define INCRON_LOG_OPTS (LOG_CONS | LOG_PID)
49 luk 38
 
39
/// Logging facility (use CRON)
45 luk 40
#define INCRON_LOG_FACIL LOG_CRON
41
 
42
 
49 luk 43
/// User name to user table mapping definition
45 luk 44
typedef std::map<std::string, UserTable*> SUT_MAP;
45
 
49 luk 46
/// User name to user table mapping table
45 luk 47
SUT_MAP g_ut;
48
 
49 luk 49
/// Finish program yes/no
47 luk 50
volatile bool g_fFinish = false;
45 luk 51
 
49 luk 52
 
47 luk 53
/// Handles a signal.
54
/**
55
 * For SIGTERM and SIGINT it sets the program finish variable.
56
 *
57
 * \param[in] signo signal number
58
 */
45 luk 59
void on_signal(int signo)
60
{
47 luk 61
  if (signo == SIGTERM || signo == SIGINT)
62
    g_fFinish = true;
45 luk 63
}
64
 
47 luk 65
/// Checks whether an user exists and has permission to use incron.
66
/**
67
 * It searches for the given user name in the user database.
68
 * If it failes it returns 'false'. Otherwise it checks
69
 * permission files for this user (see InCronTab::CheckUser()).
70
 *
71
 * \param[in] user user name
72
 * \return true = user has permission to use incron, false = otherwise
73
 *
74
 * \sa InCronTab::CheckUser()
75
 */
45 luk 76
bool check_user(const char* user)
77
{
78
  struct passwd* pw = getpwnam(user);
79
  if (pw == NULL)
80
    return false;
81
 
82
  return InCronTab::CheckUser(user);
83
}
84
 
47 luk 85
/// Attempts to load all user incron tables.
86
/**
87
 * Loaded tables are registered for processing events.
88
 *
89
 * \param[in] pIn inotify object
90
 * \param[in] pEd inotify event dispatcher
91
 *
92
 * \throw InotifyException thrown if base table directory cannot be read
93
 */
94
void load_tables(Inotify* pIn, EventDispatcher* pEd) throw (InotifyException)
45 luk 95
{
96
  DIR* d = opendir(INCRON_TABLE_BASE);
47 luk 97
  if (d == NULL)
98
    throw InotifyException("cannot open table directory", errno);
45 luk 99
 
100
  syslog(LOG_NOTICE, "loading user tables");
101
 
102
  struct dirent* pDe = NULL;
103
  while ((pDe = readdir(d)) != NULL) {
104
    std::string un(pDe->d_name);
105
    if (pDe->d_type == DT_REG && un != "." && un != "..") {
106
      if (check_user(pDe->d_name)) {
107
        syslog(LOG_INFO, "loading table for user %s", pDe->d_name);
108
        UserTable* pUt = new UserTable(pIn, pEd, un);
109
        g_ut.insert(SUT_MAP::value_type(un, pUt));
110
        pUt->Load();
111
      }
112
      else {
113
        syslog(LOG_WARNING, "table for invalid user %s found (ignored)", pDe->d_name);
114
      }
115
    }
116
  }
117
 
118
  closedir(d);
119
}
120
 
47 luk 121
/// Main application function.
122
/**
123
 * \param[in] argc argument count
124
 * \param[in] argv argument array
125
 * \return 0 on success, 1 on error
126
 *
127
 * \attention In daemon mode, it finishes immediately.
128
 */
45 luk 129
int main(int argc, char** argv)
130
{
131
  openlog(INCRON_APP_NAME, INCRON_LOG_OPTS, INCRON_LOG_FACIL);
132
 
133
  syslog(LOG_NOTICE, "starting service");
134
 
47 luk 135
  try {
136
    Inotify in;
137
    in.SetNonBlock(true);
138
 
139
    EventDispatcher ed(&in);
140
 
141
    try {
142
      load_tables(&in, &ed);
143
    } catch (InotifyException e) {
144
      int err = e.GetErrorNumber();
145
      syslog(LOG_CRIT, "%s: (%i) %s", e.GetMessage().c_str(), err, strerror(err));
146
      syslog(LOG_NOTICE, "stopping service");
147
      closelog();
148
      return 1;
149
    }
150
 
151
    signal(SIGTERM, on_signal);
152
    signal(SIGINT, on_signal);
153
    signal(SIGCHLD, on_signal);
154
 
155
    if (DAEMON)
156
      daemon(0, 0);
157
 
158
    uint32_t wm = IN_CLOSE_WRITE | IN_DELETE | IN_MOVE | IN_DELETE_SELF | IN_UNMOUNT;
159
    InotifyWatch watch(INCRON_TABLE_BASE, wm);
160
    in.Add(watch);
161
 
162
    syslog(LOG_NOTICE, "ready to process filesystem events");
163
 
164
    InotifyEvent e;
165
 
166
    struct pollfd pfd;
167
    pfd.fd = in.GetDescriptor();
49 luk 168
    pfd.events = (short) POLLIN;
47 luk 169
    pfd.revents = (short) 0;
170
 
171
    while (!g_fFinish) {
172
 
173
      int res = poll(&pfd, 1, -1);
174
      if (res > 0) {
175
        in.WaitForEvents(true);
176
        UserTable::FinishDone();
177
      }
178
      else if (res < 0) {
179
        if (errno != EINTR)
180
          throw InotifyException("polling failed", errno, NULL);
181
      }
182
 
45 luk 183
      while (in.GetEvent(e)) {
184
 
185
        if (e.GetWatch() == &watch) {
186
          if (e.IsType(IN_DELETE_SELF) || e.IsType(IN_UNMOUNT)) {
187
            syslog(LOG_CRIT, "base directory destroyed, exitting");
188
            g_fFinish = true;
189
          }
190
          else if (!e.GetName().empty()) {
191
            SUT_MAP::iterator it = g_ut.find(e.GetName());
192
            if (it != g_ut.end()) {
193
              UserTable* pUt = (*it).second;
194
              if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
195
                syslog(LOG_INFO, "table for user %s changed, reloading", e.GetName().c_str());
196
                pUt->Dispose();
197
                pUt->Load();
198
              }
199
              else if (e.IsType(IN_MOVED_FROM) || e.IsType(IN_DELETE)) {
200
                syslog(LOG_INFO, "table for user %s destroyed, removing", e.GetName().c_str());
201
                delete pUt;
202
                g_ut.erase(it);
203
              }
204
            }
205
            else if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
206
              if (check_user(e.GetName().c_str())) {
207
                syslog(LOG_INFO, "table for user %s created, loading", e.GetName().c_str());
208
                UserTable* pUt = new UserTable(&in, &ed, e.GetName());
209
                g_ut.insert(SUT_MAP::value_type(e.GetName(), pUt));
210
                pUt->Load();
211
              }
212
            }
213
          }
214
        }
215
        else {
216
          ed.DispatchEvent(e);
217
        }
218
      }
219
    }
47 luk 220
  } catch (InotifyException e) {
221
    int err = e.GetErrorNumber();
222
    syslog(LOG_CRIT, "*** unhandled exception occurred ***");
223
    syslog(LOG_CRIT, "  %s", e.GetMessage().c_str());
224
    syslog(LOG_CRIT, "  error: (%i) %s", err, strerror(err));
45 luk 225
  }
226
 
227
  syslog(LOG_NOTICE, "stopping service");
228
 
229
  closelog();
230
 
231
  return 0;
232
}