summaryrefslogtreecommitdiff
path: root/src/dynamic.cpp
blob: 1dfb823c67404b379cba2c742dc5775e5bf42e94 (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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *           	  <Craig@chatspike.net>
 *     
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

using namespace std;

#include "inspircd_config.h"
#include "inspircd_io.h"
#include "globals.h"
#include "dynamic.h"

#ifndef STATIC_LINK
#include <dlfcn.h>
#else
#include "modlist.h"
#endif

#include "inspstring.h"
#include "helperfuncs.h"
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>

extern ServerConfig* Config;

DLLManager::DLLManager(char *fname)
{
#ifdef STATIC_LINK
	this->staticname[0] = '\0';
	log(DEBUG,"Loading core-compiled module '%s'",fname);
	for (int j = 0; modsyms[j].name; j++)
	{
		log(DEBUG,"Check %s",modsyms[j].name);
		if (!strcmp(modsyms[j].name,fname))
		{
			log(DEBUG,"Found %s",fname);
			strlcpy(this->staticname,fname,1020);
			err = 0;
			return;
		}
	}
	err = "Module is not statically compiled into the ircd";
#else
#ifdef IS_CYGWIN
	// Cygwin behaviour is handled slightly differently
	// With the advent of dynamic modules. Because Windows
	// wont let you overwrite a file which is currently in
	// Use, we can safely attempt to load the module from its
	// Current location :)

	h = dlopen(fname, RTLD_NOW );
	err = (char*)dlerror();

#else
	// Copy the library to a temp location, this makes recompiles
	// a little safer if the ircd is running at the time as the
	// shared libraries are mmap()ed and not doing this causes
	// segfaults.
	FILE* x = fopen(fname,"rb");
	char tmpfile_template[255];
	char buffer[65536];
	snprintf(tmpfile_template, 255, "/tmp/inspircd_file.so.%d.XXXXXXXXXX",getpid());
	int fd = mkstemp(tmpfile_template);
	while (!feof(x))
	{
		int n = fread(buffer, 1, 65535, x);
		if (n)
			write(fd,buffer,n);
	}
	
	// Try to open the library now and get any error message.
	
	h = dlopen(tmpfile_template, RTLD_NOW );
	err = (char*)dlerror();
	close(fd);
	// We can delete the tempfile once it's loaded, leaving just the inode.
	if (!Config->debugging)
		unlink(tmpfile_template);
#endif
#endif
}

DLLManager::~DLLManager()
{
#ifndef STATIC_LINK
	// close the library if it isn't null
	if (h != 0)
	dlclose(h);
#endif
}



#ifdef STATIC_LINK

bool DLLManager::GetSymbol(initfunc* &v, char *sym_name)
{
	log(DEBUG,"Symbol search...");
	for (int j = 0; modsyms[j].name; j++)
	{
		if (!strcmp(this->staticname,modsyms[j].name))
		{
			log(DEBUG,"Loading symbol...");
			v = modsyms[j].value;
			err = 0;
			return true;
		}
	}
	err = "Module symbol missing from the core";
	return false;
}

#else

bool DLLManager::GetSymbol(void **v, char *sym_name)
{
	// try extract a symbol from the library
	// get any error message is there is any
	
	if(h != 0)
	{
		*v = dlsym( h, sym_name );
		err = (char*)dlerror();
		if( err == 0 )
			return true;
	    	else
			return false;
	}
	else
	{	
		return false;
	}
}

#endif

DLLFactoryBase::DLLFactoryBase(char *fname, char *factory) : DLLManager(fname)
{
	// try get the factory function if there is no error yet
	
	factory_func = 0;
	
	if(LastError() == 0)
	{
#ifdef STATIC_LINK
		GetSymbol( factory_func, factory ? factory : (char*)"init_module" );
#else
		GetSymbol( (void **)&factory_func, factory ? factory : (char*)"init_module" );
#endif
	}
}


DLLFactoryBase::~DLLFactoryBase()
{
}