aboutsummaryrefslogtreecommitdiff
path: root/src/client/mac/Framework/OnDemandServer.mm
blob: 386854602c05e16794ebbcfe3fadecc59858033f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// Copyright (c) 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#import "OnDemandServer.h"

#if DEBUG
  #define PRINT_MACH_RESULT(result_, message_) \
    printf(message_"%s (%d)\n", mach_error_string(result_), result_ );
#else
  #define PRINT_MACH_RESULT(result_, message_)
#endif

//==============================================================================
OnDemandServer *OnDemandServer::Create(const char *server_command,
                                       const char *service_name,
                                       bool unregister_on_cleanup,
                                       kern_return_t *out_result) {
  OnDemandServer *server = new OnDemandServer();

  if (!server) return NULL;

  kern_return_t result = server->Initialize(server_command,
                                            service_name,
                                            unregister_on_cleanup);

  if (out_result) {
    *out_result = result;
  }

  if (result == KERN_SUCCESS) {
    return server;
  }

  delete server;
  return NULL;
};

//==============================================================================
kern_return_t OnDemandServer::Initialize(const char *server_command,
                                         const char *service_name,
                                         bool unregister_on_cleanup) {
  unregister_on_cleanup_ = unregister_on_cleanup;

  kern_return_t kr =
    bootstrap_create_server(bootstrap_port,
                            const_cast<char*>(server_command),
                            geteuid(),       // server uid
                            true,
                            &server_port_);

  if (kr != KERN_SUCCESS) {
    PRINT_MACH_RESULT(kr, "bootstrap_create_server() : ");
    return kr;
  }

  strlcpy(service_name_, service_name, sizeof(service_name_));

  // Create a service called service_name, and return send rights to
  // that port in service_port_.
  kr = bootstrap_create_service(server_port_,
                                const_cast<char*>(service_name),
                                &service_port_);

  if (kr != KERN_SUCCESS) {
    PRINT_MACH_RESULT(kr, "bootstrap_create_service() : ");

    // perhaps the service has already been created - try to look it up
    kr = bootstrap_look_up(bootstrap_port, (char*)service_name, &service_port_);

    if (kr != KERN_SUCCESS) {
      PRINT_MACH_RESULT(kr, "bootstrap_look_up() : ");
      Unregister();  // clean up server port
      return kr;
    }
  }

  return KERN_SUCCESS;
}

//==============================================================================
OnDemandServer::~OnDemandServer() {
  if (unregister_on_cleanup_) {
    Unregister();
  }
}

//==============================================================================
void OnDemandServer::LaunchOnDemand() {
  // We need to do this, since the launched server is another process
  // and holding on to this port delays launching until the current process
  // exits!
  mach_port_deallocate(mach_task_self(), server_port_);
  server_port_ = MACH_PORT_DEAD;

  // Now, the service is still registered and all we need to do is send
  // a mach message to the service port in order to launch the server.
}

//==============================================================================
void OnDemandServer::Unregister() {
  if (service_port_ != MACH_PORT_NULL) {
    mach_port_deallocate(mach_task_self(), service_port_);
    service_port_ = MACH_PORT_NULL;
  }

  if (server_port_ != MACH_PORT_NULL) {
    // unregister the service
    kern_return_t kr = bootstrap_register(server_port_,
                                          service_name_,
                                          MACH_PORT_NULL);

    if (kr != KERN_SUCCESS) {
      PRINT_MACH_RESULT(kr, "Breakpad UNREGISTER : bootstrap_register() : ");
    }

    mach_port_deallocate(mach_task_self(), server_port_);
    server_port_ = MACH_PORT_NULL;
  }
}