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Made error more understandable on 'file not found'
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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
6  *                       E-mail:
7  *                <brain@chatspike.net>
8  *                <Craig@chatspike.net>
9  *     
10  * Written by Craig Edwards, Craig McLure, and others.
11  * This program is free but copyrighted software; see
12  *            the file COPYING for details.
13  *
14  * ---------------------------------------------------
15  */
16
17 using namespace std;
18
19 #include "inspircd_config.h"
20 #include "inspircd_io.h"
21 #include "globals.h"
22 #include "dynamic.h"
23
24 #ifndef STATIC_LINK
25 #include <dlfcn.h>
26 #else
27 #include "modlist.h"
28 #endif
29
30 #include "inspstring.h"
31 #include "helperfuncs.h"
32 #include <unistd.h>
33 #include <sys/types.h>
34 #include <stdio.h>
35
36 extern ServerConfig* Config;
37
38 DLLManager::DLLManager(char *fname)
39 {
40 #ifdef STATIC_LINK
41         this->staticname[0] = '\0';
42         log(DEBUG,"Loading core-compiled module '%s'",fname);
43         for (int j = 0; modsyms[j].name; j++)
44         {
45                 log(DEBUG,"Check %s",modsyms[j].name);
46                 if (!strcmp(modsyms[j].name,fname))
47                 {
48                         log(DEBUG,"Found %s",fname);
49                         strlcpy(this->staticname,fname,1020);
50                         err = 0;
51                         return;
52                 }
53         }
54         err = "Module is not statically compiled into the ircd";
55 #else
56 #ifdef IS_CYGWIN
57         // Cygwin behaviour is handled slightly differently
58         // With the advent of dynamic modules. Because Windows
59         // wont let you overwrite a file which is currently in
60         // Use, we can safely attempt to load the module from its
61         // Current location :)
62
63         h = dlopen(fname, RTLD_NOW );
64         err = (char*)dlerror();
65
66 #else
67         // Copy the library to a temp location, this makes recompiles
68         // a little safer if the ircd is running at the time as the
69         // shared libraries are mmap()ed and not doing this causes
70         // segfaults.
71         FILE* x = fopen(fname,"rb");
72         if (!x)
73         {
74                 err = "Module file not found or cannot access, game over man!";
75         }
76         char tmpfile_template[255];
77         char buffer[65536];
78         snprintf(tmpfile_template, 255, "%s/inspircd_file.so.%d.XXXXXXXXXX",Config->TempDir,getpid());
79         int fd = mkstemp(tmpfile_template);
80         while (!feof(x))
81         {
82                 int n = fread(buffer, 1, 65535, x);
83                 if (n)
84                         write(fd,buffer,n);
85         }
86         
87         // Try to open the library now and get any error message.
88         
89         h = dlopen(tmpfile_template, RTLD_NOW );
90         err = (char*)dlerror();
91         close(fd);
92         // We can delete the tempfile once it's loaded, leaving just the inode.
93         if (!Config->debugging)
94                 unlink(tmpfile_template);
95 #endif
96 #endif
97 }
98
99 DLLManager::~DLLManager()
100 {
101 #ifndef STATIC_LINK
102         // close the library if it isn't null
103         if (h != 0)
104         dlclose(h);
105 #endif
106 }
107
108
109
110 #ifdef STATIC_LINK
111
112 bool DLLManager::GetSymbol(initfunc* &v, char *sym_name)
113 {
114         log(DEBUG,"Symbol search...");
115         for (int j = 0; modsyms[j].name; j++)
116         {
117                 if (!strcmp(this->staticname,modsyms[j].name))
118                 {
119                         log(DEBUG,"Loading symbol...");
120                         v = modsyms[j].value;
121                         err = 0;
122                         return true;
123                 }
124         }
125         err = "Module symbol missing from the core";
126         return false;
127 }
128
129 #else
130
131 bool DLLManager::GetSymbol(void **v, char *sym_name)
132 {
133         // try extract a symbol from the library
134         // get any error message is there is any
135         
136         if(h != 0)
137         {
138                 *v = dlsym( h, sym_name );
139                 err = (char*)dlerror();
140                 if( err == 0 )
141                         return true;
142                 else
143                         return false;
144         }
145         else
146         {       
147                 return false;
148         }
149 }
150
151 #endif
152
153 DLLFactoryBase::DLLFactoryBase(char *fname, char *factory) : DLLManager(fname)
154 {
155         // try get the factory function if there is no error yet
156         
157         factory_func = 0;
158         
159         if(LastError() == 0)
160         {
161 #ifdef STATIC_LINK
162                 GetSymbol( factory_func, factory ? factory : (char*)"init_module" );
163 #else
164                 GetSymbol( (void **)&factory_func, factory ? factory : (char*)"init_module" );
165 #endif
166         }
167 }
168
169
170 DLLFactoryBase::~DLLFactoryBase()
171 {
172 }