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Annotation of embedaddon/sudo/compat/dlopen.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: #include <config.h>
        !            18: 
        !            19: #include <sys/types.h>
        !            20: 
        !            21: #include <stdio.h>
        !            22: #ifdef STDC_HEADERS
        !            23: # include <stdlib.h>
        !            24: # include <stddef.h>
        !            25: #else
        !            26: # ifdef HAVE_STDLIB_H
        !            27: #  include <stdlib.h>
        !            28: # endif
        !            29: #endif /* STDC_HEADERS */
        !            30: #ifdef HAVE_STRING_H
        !            31: # include <string.h>
        !            32: #endif /* HAVE_STRING_H */
        !            33: #ifdef HAVE_STRINGS_H
        !            34: # include <strings.h>
        !            35: #endif /* HAVE_STRINGS_H */
        !            36: #include <errno.h>
        !            37: 
        !            38: #include "compat/dlfcn.h"
        !            39: #include "missing.h"
        !            40: 
        !            41: #ifdef HAVE_SHL_LOAD
        !            42: /*
        !            43:  * Emulate dlopen() using shl_load().
        !            44:  */
        !            45: #include <dl.h>
        !            46: 
        !            47: #ifndef DYNAMIC_PATH
        !            48: # define DYNAMIC_PATH  0
        !            49: #endif
        !            50: 
        !            51: void *
        !            52: sudo_dlopen(const char *path, int mode)
        !            53: {
        !            54:     int flags = DYNAMIC_PATH;
        !            55: 
        !            56:     if (mode == 0)
        !            57:        mode = RTLD_LAZY;       /* default behavior */
        !            58: 
        !            59:     /* We don't support RTLD_GLOBAL or RTLD_LOCAL yet. */
        !            60:     if (ISSET(mode, RTLD_LAZY))
        !            61:        flags |= BIND_DEFERRED;
        !            62:     if (ISSET(mode, RTLD_NOW))
        !            63:        flags |= BIND_IMMEDIATE;
        !            64: 
        !            65:     return (void *)shl_load(path, flags, 0L);
        !            66: }
        !            67: 
        !            68: int
        !            69: sudo_dlclose(void *handle)
        !            70: {
        !            71:     return shl_unload((shl_t)handle);
        !            72: }
        !            73: 
        !            74: void *
        !            75: sudo_dlsym(void *vhandle, const char *symbol)
        !            76: {
        !            77:     shl_t handle = vhandle;
        !            78:     void *value = NULL;
        !            79: 
        !            80:     (void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value);
        !            81: 
        !            82:     return value;
        !            83: }
        !            84: 
        !            85: char *
        !            86: sudo_dlerror(void)
        !            87: {
        !            88:     return strerror(errno);
        !            89: }
        !            90: 
        !            91: #else /* !HAVE_SHL_LOAD */
        !            92: 
        !            93: /*
        !            94:  * Emulate dlopen() using a static list of symbols compiled into sudo.
        !            95:  */
        !            96: 
        !            97: struct sudo_preload_table {
        !            98:     const char *name;
        !            99:     void *address;
        !           100: };
        !           101: extern struct sudo_preload_table sudo_preload_table[];
        !           102: 
        !           103: void *
        !           104: sudo_dlopen(const char *path, int mode)
        !           105: {
        !           106:     return (void *)path;
        !           107: }
        !           108: 
        !           109: int
        !           110: sudo_dlclose(void *handle)
        !           111: {
        !           112:     return 0;
        !           113: }
        !           114: 
        !           115: void *
        !           116: sudo_dlsym(void *handle, const char *symbol)
        !           117: {
        !           118:     struct sudo_preload_table *sym;
        !           119: 
        !           120:     for (sym = sudo_preload_table; sym->name != NULL; sym++) {
        !           121:        if (strcmp(symbol, sym->name) == 0)
        !           122:            return sym->address;
        !           123:     }
        !           124:     return NULL;
        !           125: }
        !           126: 
        !           127: char *
        !           128: sudo_dlerror(void)
        !           129: {
        !           130:     return strerror(errno);
        !           131: }
        !           132: 
        !           133: #endif /* HAVE_SHL_LOAD */