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-rw-r--r--dso/aix/dso.c714
1 files changed, 714 insertions, 0 deletions
diff --git a/dso/aix/dso.c b/dso/aix/dso.c
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+++ b/dso/aix/dso.c
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * dso.c -- DSO system function emulation for AIX
+ *
+ * This is *only* intended for AIX < 4.3.
+ */
+
+/*
+ * Based on libdl (dlfcn.c/dlfcn.h) which is
+ * Copyright (c) 1992,1993,1995,1996,1997,1988
+ * Jens-Uwe Mager, Helios Software GmbH, Hannover, Germany.
+ *
+ * Not derived from licensed software.
+ *
+ * Permission is granted to freely use, copy, modify, and redistribute
+ * this software, provided that the author is not construed to be liable
+ * for any results of using the software, alterations are clearly marked
+ * as such, and this notice is not modified.
+ *
+ * Changes marked with `--jwe' were made on April 7 1996 by
+ * John W. Eaton <jwe@bevo.che.wisc.edu> to support g++
+ *
+ * Bundled, stripped and adjusted on April 1998 as one single source file
+ * for inclusion into the Apache HTTP server by
+ * Ralf S. Engelschall <rse@apache.org>
+ *
+ * Added to APR by David Reid April 2000
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/ldr.h>
+#include <a.out.h>
+#include "apr_arch_dso.h"
+#include "apr_portable.h"
+
+#if APR_HAS_DSO
+
+#undef FREAD
+#undef FWRITE
+#include <ldfcn.h>
+
+/*
+ * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
+ * these here to compensate for that lossage.
+ */
+#ifndef BEGINNING
+#define BEGINNING SEEK_SET
+#endif
+#ifndef FSEEK
+#define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
+#endif
+#ifndef FREAD
+#define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
+#endif
+
+/*
+ * Mode flags for the dlopen routine.
+ */
+#undef RTLD_LAZY
+#define RTLD_LAZY 1 /* lazy function call binding */
+#undef RTLD_NOW
+#define RTLD_NOW 2 /* immediate function call binding */
+#undef RTLD_GLOBAL
+#define RTLD_GLOBAL 0x100 /* allow symbols to be global */
+
+/*
+ * To be able to initialize, a library may provide a dl_info structure
+ * that contains functions to be called to initialize and terminate.
+ */
+struct dl_info {
+ void (*init) (void);
+ void (*fini) (void);
+};
+
+/* APR functions...
+ *
+ * As the AIX functions have been declared in the header file we just
+ * add the basic "wrappers" here.
+ */
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+ apr_os_dso_handle_t osdso,
+ apr_pool_t *pool)
+{
+ *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+ (*aprdso)->handle = osdso;
+ (*aprdso)->pool = pool;
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+ apr_dso_handle_t *aprdso)
+{
+ *osdso = aprdso->handle;
+ return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+ apr_dso_handle_t *dso = thedso;
+
+ if (dso->handle != NULL && dlclose(dso->handle) != 0)
+ return APR_EINIT;
+ dso->handle = NULL;
+
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle,
+ const char *path, apr_pool_t *ctx)
+{
+ void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);
+
+ *res_handle = apr_pcalloc(ctx, sizeof(*res_handle));
+
+ if(os_handle == NULL) {
+ (*res_handle)->errormsg = dlerror();
+ return APR_EDSOOPEN;
+ }
+
+ (*res_handle)->handle = (void*)os_handle;
+ (*res_handle)->pool = ctx;
+ (*res_handle)->errormsg = NULL;
+
+ apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+ return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym,
+ apr_dso_handle_t *handle,
+ const char *symname)
+{
+ void *retval = dlsym(handle->handle, symname);
+
+ if (retval == NULL) {
+ handle->errormsg = dlerror();
+ return APR_ESYMNOTFOUND;
+ }
+
+ *ressym = retval;
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
+{
+ if (dso->errormsg) {
+ apr_cpystrn(buffer, dso->errormsg, buflen);
+ return dso->errormsg;
+ }
+ return "No Error";
+}
+
+
+
+/*
+ * We simulate dlopen() et al. through a call to load. Because AIX has
+ * no call to find an exported symbol we read the loader section of the
+ * loaded module and build a list of exported symbols and their virtual
+ * address.
+ */
+
+typedef struct {
+ char *name; /* the symbols's name */
+ void *addr; /* its relocated virtual address */
+} Export, *ExportPtr;
+
+/*
+ * xlC uses the following structure to list its constructors and
+ * destructors. This is gleaned from the output of munch.
+ */
+typedef struct {
+ void (*init) (void); /* call static constructors */
+ void (*term) (void); /* call static destructors */
+} Cdtor, *CdtorPtr;
+
+typedef void (*GccCDtorPtr) (void);
+
+/*
+ * The void * handle returned from dlopen is actually a ModulePtr.
+ */
+typedef struct Module {
+ struct Module *next;
+ char *name; /* module name for refcounting */
+ int refCnt; /* the number of references */
+ void *entry; /* entry point from load */
+ struct dl_info *info; /* optional init/terminate functions */
+ CdtorPtr cdtors; /* optional C++ constructors */
+ GccCDtorPtr gcc_ctor; /* g++ constructors --jwe */
+ GccCDtorPtr gcc_dtor; /* g++ destructors --jwe */
+ int nExports; /* the number of exports found */
+ ExportPtr exports; /* the array of exports */
+} Module, *ModulePtr;
+
+/*
+ * We keep a list of all loaded modules to be able to call the fini
+ * handlers and destructors at atexit() time.
+ */
+static ModulePtr modList;
+
+/*
+ * The last error from one of the dl* routines is kept in static
+ * variables here. Each error is returned only once to the caller.
+ */
+static char errbuf[BUFSIZ];
+static int errvalid;
+
+/*
+ * The `fixed' gcc header files on AIX 3.2.5 provide a prototype for
+ * strdup(). --jwe
+ */
+extern char *strdup(const char *);
+static void caterr(char *);
+static int readExports(ModulePtr);
+static void terminate(void);
+static void *findMain(void);
+
+void *dlopen(const char *path, int mode)
+{
+ register ModulePtr mp;
+ static void *mainModule;
+
+ /*
+ * Upon the first call register a terminate handler that will
+ * close all libraries. Also get a reference to the main module
+ * for use with loadbind.
+ */
+ if (!mainModule) {
+ if ((mainModule = findMain()) == NULL)
+ return NULL;
+ atexit(terminate);
+ }
+ /*
+ * Scan the list of modules if we have the module already loaded.
+ */
+ for (mp = modList; mp; mp = mp->next)
+ if (strcmp(mp->name, path) == 0) {
+ mp->refCnt++;
+ return mp;
+ }
+ if ((mp = (ModulePtr) calloc(1, sizeof(*mp))) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "calloc: ");
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ if ((mp->name = strdup(path)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "strdup: ");
+ strcat(errbuf, strerror(errno));
+ free(mp);
+ return NULL;
+ }
+ /*
+ * load should be declared load(const char *...). Thus we
+ * cast the path to a normal char *. Ugly.
+ */
+ if ((mp->entry = (void *) loadAndInit((char *) path, L_NOAUTODEFER, NULL)) == NULL) {
+ free(mp->name);
+ free(mp);
+ errvalid++;
+ strcpy(errbuf, "dlopen: ");
+ strcat(errbuf, path);
+ strcat(errbuf, ": ");
+ /*
+ * If AIX says the file is not executable, the error
+ * can be further described by querying the loader about
+ * the last error.
+ */
+ if (errno == ENOEXEC) {
+ char *tmp[BUFSIZ / sizeof(char *)];
+ if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
+ strcpy(errbuf, strerror(errno));
+ else {
+ char **p;
+ for (p = tmp; *p; p++)
+ caterr(*p);
+ }
+ }
+ else
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ mp->refCnt = 1;
+ mp->next = modList;
+ modList = mp;
+ if (loadbind(0, mainModule, mp->entry) == -1) {
+ dlclose(mp);
+ errvalid++;
+ strcpy(errbuf, "loadbind: ");
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ /*
+ * If the user wants global binding, loadbind against all other
+ * loaded modules.
+ */
+ if (mode & RTLD_GLOBAL) {
+ register ModulePtr mp1;
+ for (mp1 = mp->next; mp1; mp1 = mp1->next)
+ if (loadbind(0, mp1->entry, mp->entry) == -1) {
+ dlclose(mp);
+ errvalid++;
+ strcpy(errbuf, "loadbind: ");
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ }
+ if (readExports(mp) == -1) {
+ dlclose(mp);
+ return NULL;
+ }
+ /*
+ * If there is a dl_info structure, call the init function.
+ */
+ if (mp->info = (struct dl_info *) dlsym(mp, "dl_info")) {
+ if (mp->info->init)
+ (*mp->info->init) ();
+ }
+ else
+ errvalid = 0;
+ /*
+ * If the shared object was compiled using xlC we will need
+ * to call static constructors (and later on dlclose destructors).
+ */
+ if (mp->cdtors = (CdtorPtr) dlsym(mp, "__cdtors")) {
+ CdtorPtr cp = mp->cdtors;
+ while (cp->init || cp->term) {
+ if (cp->init && cp->init != (void (*)(void)) 0xffffffff)
+ (*cp->init) ();
+ cp++;
+ }
+ /*
+ * If the shared object was compiled using g++, we will need
+ * to call global constructors using the _GLOBAL__DI function,
+ * and later, global destructors using the _GLOBAL_DD
+ * funciton. --jwe
+ */
+ }
+ else if (mp->gcc_ctor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DI")) {
+ (*mp->gcc_ctor) ();
+ mp->gcc_dtor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DD");
+ }
+ else
+ errvalid = 0;
+ return mp;
+}
+
+/*
+ * Attempt to decipher an AIX loader error message and append it
+ * to our static error message buffer.
+ */
+static void caterr(char *s)
+{
+ register char *p = s;
+
+ while (*p >= '0' && *p <= '9')
+ p++;
+ switch (atoi(s)) {
+ case L_ERROR_TOOMANY:
+ strcat(errbuf, "to many errors");
+ break;
+ case L_ERROR_NOLIB:
+ strcat(errbuf, "can't load library");
+ strcat(errbuf, p);
+ break;
+ case L_ERROR_UNDEF:
+ strcat(errbuf, "can't find symbol");
+ strcat(errbuf, p);
+ break;
+ case L_ERROR_RLDBAD:
+ strcat(errbuf, "bad RLD");
+ strcat(errbuf, p);
+ break;
+ case L_ERROR_FORMAT:
+ strcat(errbuf, "bad exec format in");
+ strcat(errbuf, p);
+ break;
+ case L_ERROR_ERRNO:
+ strcat(errbuf, strerror(atoi(++p)));
+ break;
+ default:
+ strcat(errbuf, s);
+ break;
+ }
+}
+
+void *dlsym(void *handle, const char *symbol)
+{
+ register ModulePtr mp = (ModulePtr) handle;
+ register ExportPtr ep;
+ register int i;
+
+ /*
+ * Could speed up the search, but I assume that one assigns
+ * the result to function pointers anyways.
+ */
+ for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
+ if (strcmp(ep->name, symbol) == 0)
+ return ep->addr;
+ errvalid++;
+ strcpy(errbuf, "dlsym: undefined symbol ");
+ strcat(errbuf, symbol);
+ return NULL;
+}
+
+const char *dlerror(void)
+{
+ if (errvalid) {
+ errvalid = 0;
+ return errbuf;
+ }
+ return NULL;
+}
+
+int dlclose(void *handle)
+{
+ register ModulePtr mp = (ModulePtr) handle;
+ int result;
+ register ModulePtr mp1;
+
+ if (--mp->refCnt > 0)
+ return 0;
+ if (mp->info && mp->info->fini)
+ (*mp->info->fini) ();
+ if (mp->cdtors) {
+ CdtorPtr cp = mp->cdtors;
+ while (cp->init || cp->term) {
+ if (cp->term && cp->init != (void (*)(void)) 0xffffffff)
+ (*cp->term) ();
+ cp++;
+ }
+ /*
+ * If the function to handle global destructors for g++
+ * exists, call it. --jwe
+ */
+ }
+ else if (mp->gcc_dtor) {
+ (*mp->gcc_dtor) ();
+ }
+ result = unload(mp->entry);
+ if (result == -1) {
+ errvalid++;
+ strcpy(errbuf, strerror(errno));
+ }
+ if (mp->exports) {
+ register ExportPtr ep;
+ register int i;
+ for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
+ if (ep->name)
+ free(ep->name);
+ free(mp->exports);
+ }
+ if (mp == modList)
+ modList = mp->next;
+ else {
+ for (mp1 = modList; mp1; mp1 = mp1->next)
+ if (mp1->next == mp) {
+ mp1->next = mp->next;
+ break;
+ }
+ }
+ free(mp->name);
+ free(mp);
+ return result;
+}
+
+static void terminate(void)
+{
+ while (modList)
+ dlclose(modList);
+}
+
+/*
+ * Build the export table from the XCOFF .loader section.
+ */
+static int readExports(ModulePtr mp)
+{
+ LDFILE *ldp = NULL;
+ SCNHDR sh, shdata;
+ LDHDR *lhp;
+ char *ldbuf;
+ LDSYM *ls;
+ int i;
+ ExportPtr ep;
+ struct ld_info *lp;
+ char *buf;
+ int size = 4 * 1024;
+ void *dataorg;
+
+ /*
+ * The module might be loaded due to the LIBPATH
+ * environment variable. Search for the loaded
+ * module using L_GETINFO.
+ */
+ if ((buf = malloc(size)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ return -1;
+ }
+ while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
+ free(buf);
+ size += 4 * 1024;
+ if ((buf = malloc(size)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ return -1;
+ }
+ }
+ if (i == -1) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ free(buf);
+ return -1;
+ }
+ /*
+ * Traverse the list of loaded modules. The entry point
+ * returned by load() does actually point to the TOC
+ * entry contained in the data segment.
+ */
+ lp = (struct ld_info *) buf;
+ while (lp) {
+ if ((unsigned long) mp->entry >= (unsigned long) lp->ldinfo_dataorg &&
+ (unsigned long) mp->entry < (unsigned long) lp->ldinfo_dataorg +
+ lp->ldinfo_datasize) {
+ dataorg = lp->ldinfo_dataorg;
+ ldp = ldopen(lp->ldinfo_filename, ldp);
+ break;
+ }
+ if (lp->ldinfo_next == 0)
+ lp = NULL;
+ else
+ lp = (struct ld_info *) ((char *) lp + lp->ldinfo_next);
+ }
+ free(buf);
+ if (!ldp) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ return -1;
+ }
+ if (TYPE(ldp) != U802TOCMAGIC) {
+ errvalid++;
+ strcpy(errbuf, "readExports: bad magic");
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ /*
+ * Get the padding for the data section. This is needed for
+ * AIX 4.1 compilers. This is used when building the final
+ * function pointer to the exported symbol.
+ */
+ if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
+ errvalid++;
+ strcpy(errbuf, "readExports: cannot read data section header");
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
+ errvalid++;
+ strcpy(errbuf, "readExports: cannot read loader section header");
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ /*
+ * We read the complete loader section in one chunk, this makes
+ * finding long symbol names residing in the string table easier.
+ */
+ if ((ldbuf = (char *) malloc(sh.s_size)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
+ errvalid++;
+ strcpy(errbuf, "readExports: cannot seek to loader section");
+ free(ldbuf);
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
+ errvalid++;
+ strcpy(errbuf, "readExports: cannot read loader section");
+ free(ldbuf);
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ lhp = (LDHDR *) ldbuf;
+ ls = (LDSYM *) (ldbuf + LDHDRSZ);
+ /*
+ * Count the number of exports to include in our export table.
+ */
+ for (i = lhp->l_nsyms; i; i--, ls++) {
+ if (!LDR_EXPORT(*ls))
+ continue;
+ mp->nExports++;
+ }
+ if ((mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "readExports: ");
+ strcat(errbuf, strerror(errno));
+ free(ldbuf);
+ while (ldclose(ldp) == FAILURE);
+ return -1;
+ }
+ /*
+ * Fill in the export table. All entries are relative to
+ * the beginning of the data origin.
+ */
+ ep = mp->exports;
+ ls = (LDSYM *) (ldbuf + LDHDRSZ);
+ for (i = lhp->l_nsyms; i; i--, ls++) {
+ char *symname;
+ char tmpsym[SYMNMLEN + 1];
+ if (!LDR_EXPORT(*ls))
+ continue;
+ if (ls->l_zeroes == 0)
+ symname = ls->l_offset + lhp->l_stoff + ldbuf;
+ else {
+ /*
+ * The l_name member is not zero terminated, we
+ * must copy the first SYMNMLEN chars and make
+ * sure we have a zero byte at the end.
+ */
+ strncpy(tmpsym, ls->l_name, SYMNMLEN);
+ tmpsym[SYMNMLEN] = '\0';
+ symname = tmpsym;
+ }
+ ep->name = strdup(symname);
+ ep->addr = (void *) ((unsigned long) dataorg +
+ ls->l_value - shdata.s_vaddr);
+ ep++;
+ }
+ free(ldbuf);
+ while (ldclose(ldp) == FAILURE);
+ return 0;
+}
+
+/*
+ * Find the main modules data origin. This is used as export pointer
+ * for loadbind() to be able to resolve references to the main part.
+ */
+static void *findMain(void)
+{
+ struct ld_info *lp;
+ char *buf;
+ int size = 4 * 1024;
+ int i;
+ void *ret;
+
+ if ((buf = malloc(size)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "findMain: ");
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
+ free(buf);
+ size += 4 * 1024;
+ if ((buf = malloc(size)) == NULL) {
+ errvalid++;
+ strcpy(errbuf, "findMain: ");
+ strcat(errbuf, strerror(errno));
+ return NULL;
+ }
+ }
+ if (i == -1) {
+ errvalid++;
+ strcpy(errbuf, "findMain: ");
+ strcat(errbuf, strerror(errno));
+ free(buf);
+ return NULL;
+ }
+ /*
+ * The first entry is the main module. The data segment
+ * starts with the TOC entries for all exports, so the
+ * data segment origin works as argument for loadbind.
+ */
+ lp = (struct ld_info *) buf;
+ ret = lp->ldinfo_dataorg;
+ free(buf);
+ return ret;
+}
+
+#endif
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