modules: use libltdl to load the modules
This commit is contained in:
William Pitcock
parent
bc38c72ced
commit
f272e7abc7
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@ -32,12 +32,7 @@
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#define MAPI_RATBOX 1
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#if defined(HAVE_SHL_LOAD)
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#include <dl.h>
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#endif
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#if !defined(STATIC_MODULES) && defined(HAVE_DLFCN_H)
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#include <dlfcn.h>
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#endif
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#include <ltdl.h>
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#include "msg.h"
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#include "hook.h"
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@ -46,7 +41,7 @@ struct module
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{
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char *name;
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const char *version;
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void *address;
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lt_dlhandle address;
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int core;
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int mapi_version;
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void * mapi_header; /* actually struct mapi_mheader_av<mapi_version> */
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177
src/modules.c
177
src/modules.c
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@ -42,6 +42,8 @@
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#ifndef STATIC_MODULES
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#include <ltdl.h>
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struct module **modlist = NULL;
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static const char *core_module_table[] = {
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@ -101,6 +103,12 @@ struct Message modrestart_msgtab = {
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void
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modules_init(void)
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{
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if(lt_dlinit())
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{
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ilog(L_MAIN, "lt_dlinit failed");
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exit(0);
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}
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mod_add_cmd(&modload_msgtab);
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mod_add_cmd(&modunload_msgtab);
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mod_add_cmd(&modreload_msgtab);
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@ -515,152 +523,6 @@ static void increase_modlist(void);
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static char unknown_ver[] = "<unknown>";
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/* This file contains the core functions to use dynamic libraries.
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* -TimeMr14C
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*/
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#ifdef HAVE_MACH_O_DYLD_H
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/*
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** jmallett's dl*(3) shims for NSModule(3) systems.
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*/
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#include <mach-o/dyld.h>
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#ifndef HAVE_DLOPEN
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#ifndef RTLD_LAZY
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#define RTLD_LAZY 2185 /* built-in dl*(3) don't care */
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#endif
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void undefinedErrorHandler(const char *);
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NSModule multipleErrorHandler(NSSymbol, NSModule, NSModule);
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void linkEditErrorHandler(NSLinkEditErrors, int, const char *, const char *);
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char *dlerror(void);
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void *dlopen(char *, int);
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int dlclose(void *);
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void *dlsym(void *, char *);
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static int firstLoad = TRUE;
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static int myDlError;
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static char *myErrorTable[] = { "Loading file as object failed\n",
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"Loading file as object succeeded\n",
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"Not a valid shared object\n",
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"Architecture of object invalid on this architecture\n",
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"Invalid or corrupt image\n",
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"Could not access object\n",
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"NSCreateObjectFileImageFromFile failed\n",
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NULL
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};
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void
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undefinedErrorHandler(const char *symbolName)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "Undefined symbol: %s", symbolName);
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ilog(L_MAIN, "Undefined symbol: %s", symbolName);
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return;
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}
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NSModule
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multipleErrorHandler(NSSymbol s, NSModule old, NSModule new)
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{
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/* XXX
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** This results in substantial leaking of memory... Should free one
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** module, maybe?
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*/
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Symbol `%s' found in `%s' and `%s'",
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NSNameOfSymbol(s), NSNameOfModule(old), NSNameOfModule(new));
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ilog(L_MAIN, "Symbol `%s' found in `%s' and `%s'",
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NSNameOfSymbol(s), NSNameOfModule(old), NSNameOfModule(new));
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/* We return which module should be considered valid, I believe */
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return new;
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}
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void
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linkEditErrorHandler(NSLinkEditErrors errorClass, int errnum,
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const char *fileName, const char *errorString)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Link editor error: %s for %s", errorString, fileName);
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ilog(L_MAIN, "Link editor error: %s for %s", errorString, fileName);
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return;
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}
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char *
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dlerror(void)
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{
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return myDlError == NSObjectFileImageSuccess ? NULL : myErrorTable[myDlError % 7];
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}
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void *
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dlopen(char *filename, int unused)
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{
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NSObjectFileImage myImage;
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NSModule myModule;
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if(firstLoad)
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{
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/*
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** If we are loading our first symbol (huzzah!) we should go ahead
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** and install link editor error handling!
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*/
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NSLinkEditErrorHandlers linkEditorErrorHandlers;
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linkEditorErrorHandlers.undefined = undefinedErrorHandler;
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linkEditorErrorHandlers.multiple = multipleErrorHandler;
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linkEditorErrorHandlers.linkEdit = linkEditErrorHandler;
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NSInstallLinkEditErrorHandlers(&linkEditorErrorHandlers);
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firstLoad = FALSE;
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}
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myDlError = NSCreateObjectFileImageFromFile(filename, &myImage);
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if(myDlError != NSObjectFileImageSuccess)
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{
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return NULL;
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}
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myModule = NSLinkModule(myImage, filename, NSLINKMODULE_OPTION_PRIVATE);
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return (void *) myModule;
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}
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int
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dlclose(void *myModule)
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{
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NSUnLinkModule(myModule, FALSE);
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return 0;
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}
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void *
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dlsym(void *myModule, char *mySymbolName)
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{
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NSSymbol mySymbol;
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mySymbol = NSLookupSymbolInModule((NSModule) myModule, mySymbolName);
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return NSAddressOfSymbol(mySymbol);
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}
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#endif
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#endif
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/*
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* HPUX dl compat functions
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*/
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#if defined(HAVE_SHL_LOAD) && !defined(HAVE_DLOPEN)
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#define RTLD_LAZY BIND_DEFERRED
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#define RTLD_GLOBAL DYNAMIC_PATH
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#define dlopen(file,mode) (void *)shl_load((file), (mode), (long) 0)
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#define dlclose(handle) shl_unload((shl_t)(handle))
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#define dlsym(handle,name) hpux_dlsym(handle,name)
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#define dlerror() strerror(errno)
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static void *
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hpux_dlsym(void *handle, char *name)
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{
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void *sym_addr;
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if(!shl_findsym((shl_t *) & handle, name, TYPE_UNDEFINED, &sym_addr))
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return sym_addr;
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return NULL;
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}
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#endif
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/* unload_one_module()
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*
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* inputs - name of module to unload
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@ -722,7 +584,7 @@ unload_one_module(const char *name, int warn)
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break;
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}
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dlclose(modlist[modindex]->address);
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lt_dlclose(modlist[modindex]->address);
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rb_free(modlist[modindex]->name);
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memmove(&modlist[modindex], &modlist[modindex + 1],
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@ -751,8 +613,7 @@ unload_one_module(const char *name, int warn)
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int
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load_a_module(const char *path, int warn, int core)
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{
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void *tmpptr = NULL;
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lt_dlhandle tmpptr;
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char *mod_basename;
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const char *ver;
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@ -760,15 +621,11 @@ load_a_module(const char *path, int warn, int core)
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mod_basename = rb_basename(path);
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#ifdef CHARYBDIS_PROFILE
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tmpptr = dlopen(path, RTLD_NOW | RTLD_LOCAL | RTLD_PROFILE);
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#else
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tmpptr = dlopen(path, RTLD_NOW | RTLD_LOCAL);
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#endif
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tmpptr = lt_dlopen(path);
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if(tmpptr == NULL)
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{
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const char *err = dlerror();
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const char *err = lt_dlerror();
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Error loading module %s: %s", mod_basename, err);
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@ -784,16 +641,16 @@ load_a_module(const char *path, int warn, int core)
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* as a single int in order to determine the API version.
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* -larne.
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*/
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mapi_version = (int *) (uintptr_t) dlsym(tmpptr, "_mheader");
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mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "_mheader");
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if((mapi_version == NULL
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&& (mapi_version = (int *) (uintptr_t) dlsym(tmpptr, "__mheader")) == NULL)
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&& (mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "__mheader")) == NULL)
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|| MAPI_MAGIC(*mapi_version) != MAPI_MAGIC_HDR)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Data format error: module %s has no MAPI header.",
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mod_basename);
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ilog(L_MAIN, "Data format error: module %s has no MAPI header.", mod_basename);
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(void) dlclose(tmpptr);
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(void) lt_dlclose(tmpptr);
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rb_free(mod_basename);
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return -1;
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}
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@ -810,7 +667,7 @@ load_a_module(const char *path, int warn, int core)
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Module %s indicated failure during load.",
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mod_basename);
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dlclose(tmpptr);
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lt_dlclose(tmpptr);
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rb_free(mod_basename);
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return -1;
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}
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@ -845,7 +702,7 @@ load_a_module(const char *path, int warn, int core)
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Module %s has unknown/unsupported MAPI version %d.",
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mod_basename, *mapi_version);
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dlclose(tmpptr);
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lt_dlclose(tmpptr);
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rb_free(mod_basename);
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return -1;
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}
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