157 lines
3.3 KiB
C
157 lines
3.3 KiB
C
/*
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* Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#ifndef HAVE_DLOPEN
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <errno.h>
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#include "compat/dlfcn.h"
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#include "missing.h"
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#ifdef HAVE_SHL_LOAD
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/*
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* Emulate dlopen() using shl_load().
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*/
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#include <dl.h>
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#ifndef DYNAMIC_PATH
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# define DYNAMIC_PATH 0
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#endif
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void *
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sudo_dlopen(const char *path, int mode)
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{
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int flags = DYNAMIC_PATH | BIND_VERBOSE;
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if (mode == 0)
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mode = RTLD_LAZY; /* default behavior */
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/* We don't support RTLD_GLOBAL or RTLD_LOCAL yet. */
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if (ISSET(mode, RTLD_LAZY))
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flags |= BIND_DEFERRED;
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if (ISSET(mode, RTLD_NOW))
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flags |= BIND_IMMEDIATE;
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return (void *)shl_load(path, flags, 0L);
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}
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int
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sudo_dlclose(void *handle)
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{
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return shl_unload((shl_t)handle);
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}
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void *
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sudo_dlsym(void *vhandle, const char *symbol)
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{
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shl_t handle = vhandle;
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void *value = NULL;
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/*
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* Note that the behavior of of RTLD_NEXT and RTLD_SELF
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* differs from most implementations when called from
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* a shared library.
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*/
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if (vhandle == RTLD_NEXT) {
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/* Iterate over all shared libs looking for symbol. */
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struct shl_descriptor *desc;
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int idx = 0;
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while (shl_get(idx++, &desc) == 0) {
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if (shl_findsym(&desc->handle, symbol, TYPE_UNDEFINED, &value) == 0)
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break;
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}
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} else {
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if (vhandle == RTLD_DEFAULT)
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handle = NULL;
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else if (vhandle == RTLD_SELF)
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handle = PROG_HANDLE;
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(void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value);
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}
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return value;
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}
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char *
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sudo_dlerror(void)
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{
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return strerror(errno);
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}
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#else /* !HAVE_SHL_LOAD */
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/*
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* Emulate dlopen() using a static list of symbols compiled into sudo.
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*/
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struct sudo_preload_table {
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const char *name;
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void *address;
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};
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extern struct sudo_preload_table sudo_preload_table[];
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void *
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sudo_dlopen(const char *path, int mode)
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{
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return (void *)path;
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}
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int
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sudo_dlclose(void *handle)
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{
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return 0;
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}
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void *
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sudo_dlsym(void *handle, const char *symbol)
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{
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struct sudo_preload_table *sym;
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if (symbol != RTLD_NEXT && symbol != RTLD_DEFAULT && symbol != RTLD_SELF) {
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for (sym = sudo_preload_table; sym->name != NULL; sym++) {
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if (strcmp(symbol, sym->name) == 0)
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return sym->address;
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}
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}
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return NULL;
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}
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char *
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sudo_dlerror(void)
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{
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return strerror(errno);
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}
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#endif /* HAVE_SHL_LOAD */
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#endif /* HAVE_DLOPEN */
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