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Annotation of embedaddon/sudo/compat/dlopen.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.3 ! misho       2:  * Copyright (c) 2010, 2012-2013 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       misho       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: 
1.1.1.3 ! misho      19: #ifndef HAVE_DLOPEN
        !            20: 
1.1       misho      21: #include <sys/types.h>
                     22: 
                     23: #include <stdio.h>
                     24: #ifdef STDC_HEADERS
                     25: # include <stdlib.h>
                     26: # include <stddef.h>
                     27: #else
                     28: # ifdef HAVE_STDLIB_H
                     29: #  include <stdlib.h>
                     30: # endif
                     31: #endif /* STDC_HEADERS */
                     32: #ifdef HAVE_STRING_H
                     33: # include <string.h>
                     34: #endif /* HAVE_STRING_H */
                     35: #ifdef HAVE_STRINGS_H
                     36: # include <strings.h>
                     37: #endif /* HAVE_STRINGS_H */
                     38: #include <errno.h>
                     39: 
                     40: #include "compat/dlfcn.h"
                     41: #include "missing.h"
                     42: 
                     43: #ifdef HAVE_SHL_LOAD
                     44: /*
                     45:  * Emulate dlopen() using shl_load().
                     46:  */
                     47: #include <dl.h>
                     48: 
                     49: #ifndef DYNAMIC_PATH
                     50: # define DYNAMIC_PATH  0
                     51: #endif
                     52: 
                     53: void *
                     54: sudo_dlopen(const char *path, int mode)
                     55: {
1.1.1.3 ! misho      56:     int flags = DYNAMIC_PATH | BIND_VERBOSE;
1.1       misho      57: 
                     58:     if (mode == 0)
                     59:        mode = RTLD_LAZY;       /* default behavior */
                     60: 
                     61:     /* We don't support RTLD_GLOBAL or RTLD_LOCAL yet. */
                     62:     if (ISSET(mode, RTLD_LAZY))
                     63:        flags |= BIND_DEFERRED;
                     64:     if (ISSET(mode, RTLD_NOW))
                     65:        flags |= BIND_IMMEDIATE;
                     66: 
                     67:     return (void *)shl_load(path, flags, 0L);
                     68: }
                     69: 
                     70: int
                     71: sudo_dlclose(void *handle)
                     72: {
                     73:     return shl_unload((shl_t)handle);
                     74: }
                     75: 
                     76: void *
                     77: sudo_dlsym(void *vhandle, const char *symbol)
                     78: {
                     79:     shl_t handle = vhandle;
                     80:     void *value = NULL;
                     81: 
1.1.1.2   misho      82:     /*
                     83:      * Note that the behavior of of RTLD_NEXT and RTLD_SELF 
                     84:      * differs from most implementations when called from
                     85:      * a shared library.
                     86:      */
                     87:     if (vhandle == RTLD_NEXT) {
                     88:        /* Iterate over all shared libs looking for symbol. */
                     89:        struct shl_descriptor *desc;
                     90:        int idx = 0;
                     91:        while (shl_get(idx++, &desc) == 0) {
                     92:            if (shl_findsym(&desc->handle, symbol, TYPE_UNDEFINED, &value) == 0)
                     93:                break;
                     94:        }
                     95:     } else {
                     96:        if (vhandle == RTLD_DEFAULT)
                     97:            handle = NULL;
                     98:        else if (vhandle == RTLD_SELF)
                     99:            handle = PROG_HANDLE;
                    100:        (void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value);
                    101:     }
1.1       misho     102: 
                    103:     return value;
                    104: }
                    105: 
                    106: char *
                    107: sudo_dlerror(void)
                    108: {
                    109:     return strerror(errno);
                    110: }
                    111: 
                    112: #else /* !HAVE_SHL_LOAD */
                    113: 
                    114: /*
                    115:  * Emulate dlopen() using a static list of symbols compiled into sudo.
                    116:  */
                    117: 
                    118: struct sudo_preload_table {
                    119:     const char *name;
                    120:     void *address;
                    121: };
                    122: extern struct sudo_preload_table sudo_preload_table[];
                    123: 
                    124: void *
                    125: sudo_dlopen(const char *path, int mode)
                    126: {
                    127:     return (void *)path;
                    128: }
                    129: 
                    130: int
                    131: sudo_dlclose(void *handle)
                    132: {
                    133:     return 0;
                    134: }
                    135: 
                    136: void *
                    137: sudo_dlsym(void *handle, const char *symbol)
                    138: {
                    139:     struct sudo_preload_table *sym;
                    140: 
1.1.1.2   misho     141:     if (symbol != RTLD_NEXT && symbol != RTLD_DEFAULT && symbol != RTLD_SELF) {
                    142:        for (sym = sudo_preload_table; sym->name != NULL; sym++) {
                    143:            if (strcmp(symbol, sym->name) == 0)
                    144:                return sym->address;
                    145:        }
1.1       misho     146:     }
                    147:     return NULL;
                    148: }
                    149: 
                    150: char *
                    151: sudo_dlerror(void)
                    152: {
                    153:     return strerror(errno);
                    154: }
                    155: #endif /* HAVE_SHL_LOAD */
1.1.1.3 ! misho     156: #endif /* HAVE_DLOPEN */