Fix protocol version check for type 2 MTU probe replies.
[tinc] / src / process.c
1 /*
2     process.c -- process management functions
3     Copyright (C) 1999-2005 Ivo Timmermans,
4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
5
6     This program is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by
8     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.
10
11     This program is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14     GNU General Public License for more details.
15
16     You should have received a copy of the GNU General Public License along
17     with this program; if not, write to the Free Software Foundation, Inc.,
18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include "system.h"
22
23 #include "conf.h"
24 #include "connection.h"
25 #include "control.h"
26 #include "device.h"
27 #include "edge.h"
28 #include "event.h"
29 #include "logger.h"
30 #include "names.h"
31 #include "net.h"
32 #include "node.h"
33 #include "process.h"
34 #include "subnet.h"
35 #include "utils.h"
36 #include "xalloc.h"
37 #include "version.h"
38
39 /* If zero, don't detach from the terminal. */
40 bool do_detach = true;
41 bool sigalrm = false;
42
43 extern char **g_argv;
44 extern bool use_logfile;
45
46 /* Some functions the less gifted operating systems might lack... */
47
48 #ifdef HAVE_MINGW
49 static SC_HANDLE manager = NULL;
50 static SC_HANDLE service = NULL;
51 static SERVICE_STATUS status = {0};
52 static SERVICE_STATUS_HANDLE statushandle = 0;
53
54 static bool install_service(void) {
55         char command[4096] = "\"";
56         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
57
58         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
59         if(!manager) {
60                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
61                 return false;
62         }
63
64         if(!strchr(program_name, '\\')) {
65                 GetCurrentDirectory(sizeof command - 1, command + 1);
66                 strncat(command, "\\", sizeof command - strlen(command));
67         }
68
69         strncat(command, program_name, sizeof command - strlen(command));
70
71         strncat(command, "\"", sizeof command - strlen(command));
72
73         for(char **argp = g_argv + 1; *argp; argp++) {
74                 char *space = strchr(*argp, ' ');
75                 strncat(command, " ", sizeof command - strlen(command));
76
77                 if(space)
78                         strncat(command, "\"", sizeof command - strlen(command));
79
80                 strncat(command, *argp, sizeof command - strlen(command));
81
82                 if(space)
83                         strncat(command, "\"", sizeof command - strlen(command));
84         }
85
86         service = CreateService(manager, identname, identname,
87                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
88                         command, NULL, NULL, NULL, NULL, NULL);
89
90         if(!service) {
91                 DWORD lasterror = GetLastError();
92                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
93                 if(lasterror != ERROR_SERVICE_EXISTS)
94                         return false;
95         }
96
97         if(service) {
98                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
99                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
100         } else {
101                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
102         }
103
104         if(!StartService(service, 0, NULL))
105                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
106         else
107                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
108
109         return true;
110 }
111
112 io_t stop_io;
113
114 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
115         switch(request) {
116                 case SERVICE_CONTROL_INTERROGATE:
117                         SetServiceStatus(statushandle, &status);
118                         return NO_ERROR;
119                 case SERVICE_CONTROL_STOP:
120                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
121                         break;
122                 case SERVICE_CONTROL_SHUTDOWN:
123                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
124                         break;
125                 default:
126                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
127                         return ERROR_CALL_NOT_IMPLEMENTED;
128         }
129
130         status.dwWaitHint = 1000;
131         status.dwCurrentState = SERVICE_STOP_PENDING;
132         SetServiceStatus(statushandle, &status);
133         if (WSASetEvent(stop_io.event) == FALSE)
134                 abort();
135         return NO_ERROR;
136 }
137
138 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
139         extern int main2(int argc, char **argv);
140
141         status.dwServiceType = SERVICE_WIN32;
142         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
143         status.dwWin32ExitCode = 0;
144         status.dwServiceSpecificExitCode = 0;
145         status.dwCheckPoint = 0;
146
147         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
148
149         if (!statushandle) {
150                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
151         } else {
152                 status.dwWaitHint = 30000;
153                 status.dwCurrentState = SERVICE_START_PENDING;
154                 SetServiceStatus(statushandle, &status);
155
156                 status.dwWaitHint = 0;
157                 status.dwCurrentState = SERVICE_RUNNING;
158                 SetServiceStatus(statushandle, &status);
159
160                 main2(argc, argv);
161
162                 status.dwWaitHint = 0;
163                 status.dwCurrentState = SERVICE_STOPPED;
164                 SetServiceStatus(statushandle, &status);
165         }
166
167         return;
168 }
169
170 bool init_service(void) {
171         SERVICE_TABLE_ENTRY services[] = {
172                 {identname, run_service},
173                 {NULL, NULL}
174         };
175
176         if(!StartServiceCtrlDispatcher(services)) {
177                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
178                         return false;
179                 }
180                 else
181                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
182         }
183
184         return true;
185 }
186 #endif
187
188 /*
189   Detach from current terminal
190 */
191 bool detach(void) {
192 #ifndef HAVE_MINGW
193         signal(SIGPIPE, SIG_IGN);
194         signal(SIGUSR1, SIG_IGN);
195         signal(SIGUSR2, SIG_IGN);
196         signal(SIGWINCH, SIG_IGN);
197
198         closelogger();
199 #endif
200
201         if(do_detach) {
202 #ifndef HAVE_MINGW
203                 if(daemon(0, 0)) {
204                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
205                         return false;
206                 }
207 #else
208                 if(!statushandle)
209                         exit(!install_service());
210 #endif
211         }
212
213         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
214
215         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
216                            VERSION, BUILD_DATE, BUILD_TIME, debug_level);
217
218         return true;
219 }
220
221