[331] | 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 | #include "dso_locl.h"
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| 11 |
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| 12 | #ifdef DSO_DL
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| 13 |
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| 14 | # include <dl.h>
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| 15 |
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| 16 | /* Part of the hack in "dl_load" ... */
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| 17 | # define DSO_MAX_TRANSLATED_SIZE 256
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| 18 |
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| 19 | static int dl_load(DSO *dso);
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| 20 | static int dl_unload(DSO *dso);
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| 21 | static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
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| 22 | static char *dl_name_converter(DSO *dso, const char *filename);
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| 23 | static char *dl_merger(DSO *dso, const char *filespec1,
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| 24 | const char *filespec2);
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| 25 | static int dl_pathbyaddr(void *addr, char *path, int sz);
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| 26 | static void *dl_globallookup(const char *name);
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| 27 |
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| 28 | static DSO_METHOD dso_meth_dl = {
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| 29 | "OpenSSL 'dl' shared library method",
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| 30 | dl_load,
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| 31 | dl_unload,
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| 32 | dl_bind_func,
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| 33 | NULL, /* ctrl */
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| 34 | dl_name_converter,
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| 35 | dl_merger,
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| 36 | NULL, /* init */
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| 37 | NULL, /* finish */
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| 38 | dl_pathbyaddr,
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| 39 | dl_globallookup
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| 40 | };
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| 41 |
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| 42 | DSO_METHOD *DSO_METHOD_openssl(void)
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| 43 | {
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| 44 | return &dso_meth_dl;
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| 45 | }
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| 46 |
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| 47 | /*
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| 48 | * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
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| 49 | * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
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| 50 | * itself a pointer type so the cast is safe.
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| 51 | */
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| 52 |
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| 53 | static int dl_load(DSO *dso)
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| 54 | {
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| 55 | shl_t ptr = NULL;
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| 56 | /*
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| 57 | * We don't do any fancy retries or anything, just take the method's (or
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| 58 | * DSO's if it has the callback set) best translation of the
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| 59 | * platform-independent filename and try once with that.
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| 60 | */
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| 61 | char *filename = DSO_convert_filename(dso, NULL);
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| 62 |
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| 63 | if (filename == NULL) {
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| 64 | DSOerr(DSO_F_DL_LOAD, DSO_R_NO_FILENAME);
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| 65 | goto err;
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| 66 | }
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| 67 | ptr = shl_load(filename, BIND_IMMEDIATE |
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| 68 | (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
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| 69 | DYNAMIC_PATH), 0L);
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| 70 | if (ptr == NULL) {
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| 71 | char errbuf[160];
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| 72 | DSOerr(DSO_F_DL_LOAD, DSO_R_LOAD_FAILED);
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| 73 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
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| 74 | ERR_add_error_data(4, "filename(", filename, "): ", errbuf);
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| 75 | goto err;
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| 76 | }
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| 77 | if (!sk_push(dso->meth_data, (char *)ptr)) {
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| 78 | DSOerr(DSO_F_DL_LOAD, DSO_R_STACK_ERROR);
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| 79 | goto err;
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| 80 | }
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| 81 | /*
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| 82 | * Success, stick the converted filename we've loaded under into the DSO
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| 83 | * (it also serves as the indicator that we are currently loaded).
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| 84 | */
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| 85 | dso->loaded_filename = filename;
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| 86 | return (1);
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| 87 | err:
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| 88 | /* Cleanup! */
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| 89 | OPENSSL_free(filename);
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| 90 | if (ptr != NULL)
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| 91 | shl_unload(ptr);
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| 92 | return (0);
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| 93 | }
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| 94 |
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| 95 | static int dl_unload(DSO *dso)
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| 96 | {
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| 97 | shl_t ptr;
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| 98 | if (dso == NULL) {
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| 99 | DSOerr(DSO_F_DL_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
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| 100 | return (0);
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| 101 | }
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| 102 | if (sk_num(dso->meth_data) < 1)
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| 103 | return (1);
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| 104 | /* Is this statement legal? */
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| 105 | ptr = (shl_t) sk_pop(dso->meth_data);
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| 106 | if (ptr == NULL) {
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| 107 | DSOerr(DSO_F_DL_UNLOAD, DSO_R_NULL_HANDLE);
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| 108 | /*
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| 109 | * Should push the value back onto the stack in case of a retry.
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| 110 | */
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| 111 | sk_push(dso->meth_data, (char *)ptr);
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| 112 | return (0);
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| 113 | }
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| 114 | shl_unload(ptr);
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| 115 | return (1);
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| 116 | }
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| 117 |
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| 118 | static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
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| 119 | {
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| 120 | shl_t ptr;
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| 121 | void *sym;
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| 122 |
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| 123 | if ((dso == NULL) || (symname == NULL)) {
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| 124 | DSOerr(DSO_F_DL_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
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| 125 | return (NULL);
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| 126 | }
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| 127 | if (sk_num(dso->meth_data) < 1) {
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| 128 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_STACK_ERROR);
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| 129 | return (NULL);
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| 130 | }
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| 131 | ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
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| 132 | if (ptr == NULL) {
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| 133 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_NULL_HANDLE);
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| 134 | return (NULL);
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| 135 | }
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| 136 | if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
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| 137 | char errbuf[160];
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| 138 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_SYM_FAILURE);
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| 139 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
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| 140 | ERR_add_error_data(4, "symname(", symname, "): ", errbuf);
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| 141 | return (NULL);
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| 142 | }
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| 143 | return ((DSO_FUNC_TYPE)sym);
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| 144 | }
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| 145 |
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| 146 | static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
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| 147 | {
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| 148 | char *merged;
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| 149 |
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| 150 | if (!filespec1 && !filespec2) {
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| 151 | DSOerr(DSO_F_DL_MERGER, ERR_R_PASSED_NULL_PARAMETER);
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| 152 | return (NULL);
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| 153 | }
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| 154 | /*
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| 155 | * If the first file specification is a rooted path, it rules. same goes
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| 156 | * if the second file specification is missing.
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| 157 | */
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| 158 | if (!filespec2 || filespec1[0] == '/') {
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| 159 | merged = OPENSSL_strdup(filespec1);
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| 160 | if (merged == NULL) {
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| 161 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
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| 162 | return (NULL);
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| 163 | }
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| 164 | }
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| 165 | /*
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| 166 | * If the first file specification is missing, the second one rules.
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| 167 | */
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| 168 | else if (!filespec1) {
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| 169 | merged = OPENSSL_strdup(filespec2);
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| 170 | if (merged == NULL) {
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| 171 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
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| 172 | return (NULL);
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| 173 | }
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| 174 | } else
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| 175 | /*
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| 176 | * This part isn't as trivial as it looks. It assumes that the
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| 177 | * second file specification really is a directory, and makes no
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| 178 | * checks whatsoever. Therefore, the result becomes the
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| 179 | * concatenation of filespec2 followed by a slash followed by
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| 180 | * filespec1.
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| 181 | */
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| 182 | {
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| 183 | int spec2len, len;
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| 184 |
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| 185 | spec2len = (filespec2 ? strlen(filespec2) : 0);
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| 186 | len = spec2len + (filespec1 ? strlen(filespec1) : 0);
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| 187 |
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| 188 | if (spec2len && filespec2[spec2len - 1] == '/') {
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| 189 | spec2len--;
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| 190 | len--;
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| 191 | }
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| 192 | merged = OPENSSL_malloc(len + 2);
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| 193 | if (merged == NULL) {
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| 194 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
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| 195 | return (NULL);
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| 196 | }
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| 197 | strcpy(merged, filespec2);
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| 198 | merged[spec2len] = '/';
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| 199 | strcpy(&merged[spec2len + 1], filespec1);
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| 200 | }
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| 201 | return (merged);
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| 202 | }
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| 203 |
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| 204 | /*
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| 205 | * This function is identical to the one in dso_dlfcn.c, but as it is highly
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| 206 | * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
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| 207 | * the same time, there's no great duplicating the code. Figuring out an
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| 208 | * elegant way to share one copy of the code would be more difficult and
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| 209 | * would not leave the implementations independent.
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| 210 | */
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| 211 | static char *dl_name_converter(DSO *dso, const char *filename)
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| 212 | {
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| 213 | char *translated;
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| 214 | int len, rsize, transform;
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| 215 |
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| 216 | len = strlen(filename);
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| 217 | rsize = len + 1;
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| 218 | transform = (strstr(filename, "/") == NULL);
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| 219 | {
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| 220 | /* We will convert this to "%s.s?" or "lib%s.s?" */
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| 221 | rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
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| 222 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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| 223 | rsize += 3; /* The length of "lib" */
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| 224 | }
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| 225 | translated = OPENSSL_malloc(rsize);
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| 226 | if (translated == NULL) {
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| 227 | DSOerr(DSO_F_DL_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
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| 228 | return (NULL);
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| 229 | }
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| 230 | if (transform) {
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| 231 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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| 232 | sprintf(translated, "lib%s%s", filename, DSO_EXTENSION);
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| 233 | else
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| 234 | sprintf(translated, "%s%s", filename, DSO_EXTENSION);
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| 235 | } else
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| 236 | sprintf(translated, "%s", filename);
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| 237 | return (translated);
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| 238 | }
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| 239 |
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| 240 | static int dl_pathbyaddr(void *addr, char *path, int sz)
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| 241 | {
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| 242 | struct shl_descriptor inf;
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| 243 | int i, len;
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| 244 |
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| 245 | if (addr == NULL) {
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| 246 | union {
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| 247 | int (*f) (void *, char *, int);
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| 248 | void *p;
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| 249 | } t = {
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| 250 | dl_pathbyaddr
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| 251 | };
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| 252 | addr = t.p;
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| 253 | }
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| 254 |
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| 255 | for (i = -1; shl_get_r(i, &inf) == 0; i++) {
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| 256 | if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
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| 257 | ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
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| 258 | len = (int)strlen(inf.filename);
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| 259 | if (sz <= 0)
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| 260 | return len + 1;
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| 261 | if (len >= sz)
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| 262 | len = sz - 1;
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| 263 | memcpy(path, inf.filename, len);
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| 264 | path[len++] = 0;
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| 265 | return len;
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| 266 | }
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| 267 | }
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| 268 |
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| 269 | return -1;
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| 270 | }
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| 271 |
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| 272 | static void *dl_globallookup(const char *name)
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| 273 | {
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| 274 | void *ret;
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| 275 | shl_t h = NULL;
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| 276 |
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| 277 | return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;
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| 278 | }
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| 279 | #endif /* DSO_DL */
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