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Annotation of embedaddon/sudo/compat/dlopen.c, revision 1.1.1.1

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 */