| 1 | /*
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| 2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * We need to do this early, because stdio.h includes the header files that
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| 12 | * handle _GNU_SOURCE and other similar macros. Defining it later is simply
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| 13 | * too late, because those headers are protected from re- inclusion.
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| 14 | */
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| 15 | #ifndef _GNU_SOURCE
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| 16 | # define _GNU_SOURCE /* make sure dladdr is declared */
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| 17 | #endif
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| 18 |
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| 19 | #include "dso_locl.h"
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| 20 |
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| 21 | #ifdef DSO_DLFCN
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| 22 |
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| 23 | # ifdef HAVE_DLFCN_H
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| 24 | # ifdef __osf__
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| 25 | # define __EXTENSIONS__
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| 26 | # endif
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| 27 | # include <dlfcn.h>
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| 28 | # define HAVE_DLINFO 1
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| 29 | # if defined(_AIX) || defined(__CYGWIN__) || \
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| 30 | defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
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| 31 | (defined(__osf__) && !defined(RTLD_NEXT)) || \
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| 32 | (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
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| 33 | defined(__ANDROID__)
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| 34 | # undef HAVE_DLINFO
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| 35 | # endif
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| 36 | # endif
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| 37 |
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| 38 | /* Part of the hack in "dlfcn_load" ... */
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| 39 | # define DSO_MAX_TRANSLATED_SIZE 256
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| 40 |
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| 41 | static int dlfcn_load(DSO *dso);
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| 42 | static int dlfcn_unload(DSO *dso);
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| 43 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
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| 44 | static char *dlfcn_name_converter(DSO *dso, const char *filename);
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| 45 | static char *dlfcn_merger(DSO *dso, const char *filespec1,
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| 46 | const char *filespec2);
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| 47 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
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| 48 | static void *dlfcn_globallookup(const char *name);
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| 49 |
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| 50 | static DSO_METHOD dso_meth_dlfcn = {
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| 51 | "OpenSSL 'dlfcn' shared library method",
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| 52 | dlfcn_load,
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| 53 | dlfcn_unload,
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| 54 | dlfcn_bind_func,
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| 55 | NULL, /* ctrl */
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| 56 | dlfcn_name_converter,
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| 57 | dlfcn_merger,
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| 58 | NULL, /* init */
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| 59 | NULL, /* finish */
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| 60 | dlfcn_pathbyaddr,
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| 61 | dlfcn_globallookup
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| 62 | };
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| 63 |
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| 64 | DSO_METHOD *DSO_METHOD_openssl(void)
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| 65 | {
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| 66 | return &dso_meth_dlfcn;
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| 67 | }
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| 68 |
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| 69 | /*
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| 70 | * Prior to using the dlopen() function, we should decide on the flag we
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| 71 | * send. There's a few different ways of doing this and it's a messy
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| 72 | * venn-diagram to match up which platforms support what. So as we don't have
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| 73 | * autoconf yet, I'm implementing a hack that could be hacked further
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| 74 | * relatively easily to deal with cases as we find them. Initially this is to
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| 75 | * cope with OpenBSD.
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| 76 | */
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| 77 | # if defined(__OpenBSD__) || defined(__NetBSD__)
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| 78 | # ifdef DL_LAZY
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| 79 | # define DLOPEN_FLAG DL_LAZY
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| 80 | # else
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| 81 | # ifdef RTLD_NOW
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| 82 | # define DLOPEN_FLAG RTLD_NOW
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| 83 | # else
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| 84 | # define DLOPEN_FLAG 0
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| 85 | # endif
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| 86 | # endif
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| 87 | # else
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| 88 | # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
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| 89 | # endif
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| 90 |
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| 91 | /*
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| 92 | * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
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| 93 | * (void*) returned from dlopen().
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| 94 | */
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| 95 |
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| 96 | static int dlfcn_load(DSO *dso)
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| 97 | {
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| 98 | void *ptr = NULL;
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| 99 | /* See applicable comments in dso_dl.c */
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| 100 | char *filename = DSO_convert_filename(dso, NULL);
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| 101 | int flags = DLOPEN_FLAG;
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| 102 |
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| 103 | if (filename == NULL) {
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| 104 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
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| 105 | goto err;
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| 106 | }
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| 107 | # ifdef RTLD_GLOBAL
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| 108 | if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
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| 109 | flags |= RTLD_GLOBAL;
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| 110 | # endif
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| 111 | ptr = dlopen(filename, flags);
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| 112 | if (ptr == NULL) {
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| 113 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
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| 114 | ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
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| 115 | goto err;
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| 116 | }
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| 117 | if (!sk_void_push(dso->meth_data, (char *)ptr)) {
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| 118 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
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| 119 | goto err;
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| 120 | }
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| 121 | /* Success */
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| 122 | dso->loaded_filename = filename;
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| 123 | return (1);
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| 124 | err:
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| 125 | /* Cleanup! */
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| 126 | OPENSSL_free(filename);
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| 127 | if (ptr != NULL)
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| 128 | dlclose(ptr);
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| 129 | return (0);
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| 130 | }
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| 131 |
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| 132 | static int dlfcn_unload(DSO *dso)
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| 133 | {
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| 134 | void *ptr;
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| 135 | if (dso == NULL) {
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| 136 | DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
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| 137 | return (0);
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| 138 | }
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| 139 | if (sk_void_num(dso->meth_data) < 1)
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| 140 | return (1);
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| 141 | ptr = sk_void_pop(dso->meth_data);
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| 142 | if (ptr == NULL) {
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| 143 | DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
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| 144 | /*
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| 145 | * Should push the value back onto the stack in case of a retry.
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| 146 | */
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| 147 | sk_void_push(dso->meth_data, ptr);
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| 148 | return (0);
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| 149 | }
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| 150 | /* For now I'm not aware of any errors associated with dlclose() */
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| 151 | dlclose(ptr);
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| 152 | return (1);
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| 153 | }
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| 154 |
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| 155 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
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| 156 | {
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| 157 | void *ptr;
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| 158 | union {
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| 159 | DSO_FUNC_TYPE sym;
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| 160 | void *dlret;
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| 161 | } u;
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| 162 |
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| 163 | if ((dso == NULL) || (symname == NULL)) {
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| 164 | DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
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| 165 | return (NULL);
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| 166 | }
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| 167 | if (sk_void_num(dso->meth_data) < 1) {
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| 168 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
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| 169 | return (NULL);
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| 170 | }
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| 171 | ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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| 172 | if (ptr == NULL) {
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| 173 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
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| 174 | return (NULL);
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| 175 | }
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| 176 | u.dlret = dlsym(ptr, symname);
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| 177 | if (u.dlret == NULL) {
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| 178 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
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| 179 | ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
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| 180 | return (NULL);
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| 181 | }
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| 182 | return u.sym;
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| 183 | }
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| 184 |
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| 185 | static char *dlfcn_merger(DSO *dso, const char *filespec1,
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| 186 | const char *filespec2)
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| 187 | {
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| 188 | char *merged;
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| 189 |
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| 190 | if (!filespec1 && !filespec2) {
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| 191 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
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| 192 | return (NULL);
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| 193 | }
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| 194 | /*
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| 195 | * If the first file specification is a rooted path, it rules. same goes
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| 196 | * if the second file specification is missing.
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| 197 | */
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| 198 | if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
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| 199 | merged = OPENSSL_strdup(filespec1);
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| 200 | if (merged == NULL) {
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| 201 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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| 202 | return (NULL);
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| 203 | }
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| 204 | }
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| 205 | /*
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| 206 | * If the first file specification is missing, the second one rules.
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| 207 | */
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| 208 | else if (!filespec1) {
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| 209 | merged = OPENSSL_strdup(filespec2);
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| 210 | if (merged == NULL) {
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| 211 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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| 212 | return (NULL);
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| 213 | }
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| 214 | } else {
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| 215 | /*
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| 216 | * This part isn't as trivial as it looks. It assumes that the
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| 217 | * second file specification really is a directory, and makes no
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| 218 | * checks whatsoever. Therefore, the result becomes the
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| 219 | * concatenation of filespec2 followed by a slash followed by
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| 220 | * filespec1.
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| 221 | */
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| 222 | int spec2len, len;
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| 223 |
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| 224 | spec2len = strlen(filespec2);
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| 225 | len = spec2len + strlen(filespec1);
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| 226 |
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| 227 | if (spec2len && filespec2[spec2len - 1] == '/') {
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| 228 | spec2len--;
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| 229 | len--;
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| 230 | }
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| 231 | merged = OPENSSL_malloc(len + 2);
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| 232 | if (merged == NULL) {
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| 233 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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| 234 | return (NULL);
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| 235 | }
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| 236 | strcpy(merged, filespec2);
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| 237 | merged[spec2len] = '/';
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| 238 | strcpy(&merged[spec2len + 1], filespec1);
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| 239 | }
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| 240 | return (merged);
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| 241 | }
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| 242 |
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| 243 | static char *dlfcn_name_converter(DSO *dso, const char *filename)
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| 244 | {
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| 245 | char *translated;
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| 246 | int len, rsize, transform;
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| 247 |
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| 248 | len = strlen(filename);
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| 249 | rsize = len + 1;
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| 250 | transform = (strstr(filename, "/") == NULL);
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| 251 | if (transform) {
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| 252 | /* We will convert this to "%s.so" or "lib%s.so" etc */
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| 253 | rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
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| 254 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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| 255 | rsize += 3; /* The length of "lib" */
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| 256 | }
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| 257 | translated = OPENSSL_malloc(rsize);
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| 258 | if (translated == NULL) {
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| 259 | DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
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| 260 | return (NULL);
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| 261 | }
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| 262 | if (transform) {
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| 263 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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| 264 | sprintf(translated, "lib%s" DSO_EXTENSION, filename);
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| 265 | else
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| 266 | sprintf(translated, "%s" DSO_EXTENSION, filename);
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| 267 | } else
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| 268 | sprintf(translated, "%s", filename);
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| 269 | return (translated);
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| 270 | }
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| 271 |
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| 272 | # ifdef __sgi
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| 273 | /*-
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| 274 | This is a quote from IRIX manual for dladdr(3c):
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| 275 |
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| 276 | <dlfcn.h> does not contain a prototype for dladdr or definition of
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| 277 | Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
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| 278 | but contains no dladdr prototype and no IRIX library contains an
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| 279 | implementation. Write your own declaration based on the code below.
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| 280 |
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| 281 | The following code is dependent on internal interfaces that are not
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| 282 | part of the IRIX compatibility guarantee; however, there is no future
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| 283 | intention to change this interface, so on a practical level, the code
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| 284 | below is safe to use on IRIX.
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| 285 | */
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| 286 | # include <rld_interface.h>
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| 287 | # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
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| 288 | # define _RLD_INTERFACE_DLFCN_H_DLADDR
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| 289 | typedef struct Dl_info {
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| 290 | const char *dli_fname;
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| 291 | void *dli_fbase;
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| 292 | const char *dli_sname;
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| 293 | void *dli_saddr;
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| 294 | int dli_version;
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| 295 | int dli_reserved1;
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| 296 | long dli_reserved[4];
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| 297 | } Dl_info;
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| 298 | # else
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| 299 | typedef struct Dl_info Dl_info;
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| 300 | # endif
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| 301 | # define _RLD_DLADDR 14
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| 302 |
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| 303 | static int dladdr(void *address, Dl_info *dl)
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| 304 | {
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| 305 | void *v;
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| 306 | v = _rld_new_interface(_RLD_DLADDR, address, dl);
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| 307 | return (int)v;
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| 308 | }
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| 309 | # endif /* __sgi */
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| 310 |
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| 311 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
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| 312 | {
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| 313 | # ifdef HAVE_DLINFO
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| 314 | Dl_info dli;
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| 315 | int len;
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| 316 |
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| 317 | if (addr == NULL) {
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| 318 | union {
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| 319 | int (*f) (void *, char *, int);
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| 320 | void *p;
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| 321 | } t = {
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| 322 | dlfcn_pathbyaddr
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| 323 | };
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| 324 | addr = t.p;
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| 325 | }
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| 326 |
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| 327 | if (dladdr(addr, &dli)) {
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| 328 | len = (int)strlen(dli.dli_fname);
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| 329 | if (sz <= 0)
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| 330 | return len + 1;
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| 331 | if (len >= sz)
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| 332 | len = sz - 1;
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| 333 | memcpy(path, dli.dli_fname, len);
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| 334 | path[len++] = 0;
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| 335 | return len;
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| 336 | }
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| 337 |
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| 338 | ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
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| 339 | # endif
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| 340 | return -1;
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| 341 | }
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| 342 |
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| 343 | static void *dlfcn_globallookup(const char *name)
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| 344 | {
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| 345 | void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
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| 346 |
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| 347 | if (handle) {
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| 348 | ret = dlsym(handle, name);
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| 349 | dlclose(handle);
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| 350 | }
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| 351 |
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| 352 | return ret;
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| 353 | }
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| 354 | #endif /* DSO_DLFCN */
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