diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/dso/dso_dlfcn.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/dso/dso_dlfcn.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/dso/dso_dlfcn.c b/openssl-1.1.0h/crypto/dso/dso_dlfcn.c new file mode 100644 index 0000000..a4b0cdd --- /dev/null +++ b/openssl-1.1.0h/crypto/dso/dso_dlfcn.c @@ -0,0 +1,354 @@ +/* + * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* + * We need to do this early, because stdio.h includes the header files that + * handle _GNU_SOURCE and other similar macros. Defining it later is simply + * too late, because those headers are protected from re- inclusion. + */ +#ifndef _GNU_SOURCE +# define _GNU_SOURCE /* make sure dladdr is declared */ +#endif + +#include "dso_locl.h" + +#ifdef DSO_DLFCN + +# ifdef HAVE_DLFCN_H +# ifdef __osf__ +# define __EXTENSIONS__ +# endif +# include <dlfcn.h> +# define HAVE_DLINFO 1 +# if defined(_AIX) || defined(__CYGWIN__) || \ + defined(__SCO_VERSION__) || defined(_SCO_ELF) || \ + (defined(__osf__) && !defined(RTLD_NEXT)) || \ + (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \ + defined(__ANDROID__) +# undef HAVE_DLINFO +# endif +# endif + +/* Part of the hack in "dlfcn_load" ... */ +# define DSO_MAX_TRANSLATED_SIZE 256 + +static int dlfcn_load(DSO *dso); +static int dlfcn_unload(DSO *dso); +static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname); +static char *dlfcn_name_converter(DSO *dso, const char *filename); +static char *dlfcn_merger(DSO *dso, const char *filespec1, + const char *filespec2); +static int dlfcn_pathbyaddr(void *addr, char *path, int sz); +static void *dlfcn_globallookup(const char *name); + +static DSO_METHOD dso_meth_dlfcn = { + "OpenSSL 'dlfcn' shared library method", + dlfcn_load, + dlfcn_unload, + dlfcn_bind_func, + NULL, /* ctrl */ + dlfcn_name_converter, + dlfcn_merger, + NULL, /* init */ + NULL, /* finish */ + dlfcn_pathbyaddr, + dlfcn_globallookup +}; + +DSO_METHOD *DSO_METHOD_openssl(void) +{ + return &dso_meth_dlfcn; +} + +/* + * Prior to using the dlopen() function, we should decide on the flag we + * send. There's a few different ways of doing this and it's a messy + * venn-diagram to match up which platforms support what. So as we don't have + * autoconf yet, I'm implementing a hack that could be hacked further + * relatively easily to deal with cases as we find them. Initially this is to + * cope with OpenBSD. + */ +# if defined(__OpenBSD__) || defined(__NetBSD__) +# ifdef DL_LAZY +# define DLOPEN_FLAG DL_LAZY +# else +# ifdef RTLD_NOW +# define DLOPEN_FLAG RTLD_NOW +# else +# define DLOPEN_FLAG 0 +# endif +# endif +# else +# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */ +# endif + +/* + * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle + * (void*) returned from dlopen(). + */ + +static int dlfcn_load(DSO *dso) +{ + void *ptr = NULL; + /* See applicable comments in dso_dl.c */ + char *filename = DSO_convert_filename(dso, NULL); + int flags = DLOPEN_FLAG; + + if (filename == NULL) { + DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME); + goto err; + } +# ifdef RTLD_GLOBAL + if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS) + flags |= RTLD_GLOBAL; +# endif + ptr = dlopen(filename, flags); + if (ptr == NULL) { + DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED); + ERR_add_error_data(4, "filename(", filename, "): ", dlerror()); + goto err; + } + if (!sk_void_push(dso->meth_data, (char *)ptr)) { + DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR); + goto err; + } + /* Success */ + dso->loaded_filename = filename; + return (1); + err: + /* Cleanup! */ + OPENSSL_free(filename); + if (ptr != NULL) + dlclose(ptr); + return (0); +} + +static int dlfcn_unload(DSO *dso) +{ + void *ptr; + if (dso == NULL) { + DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER); + return (0); + } + if (sk_void_num(dso->meth_data) < 1) + return (1); + ptr = sk_void_pop(dso->meth_data); + if (ptr == NULL) { + DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE); + /* + * Should push the value back onto the stack in case of a retry. + */ + sk_void_push(dso->meth_data, ptr); + return (0); + } + /* For now I'm not aware of any errors associated with dlclose() */ + dlclose(ptr); + return (1); +} + +static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname) +{ + void *ptr; + union { + DSO_FUNC_TYPE sym; + void *dlret; + } u; + + if ((dso == NULL) || (symname == NULL)) { + DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); + return (NULL); + } + if (sk_void_num(dso->meth_data) < 1) { + DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR); + return (NULL); + } + ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); + if (ptr == NULL) { + DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE); + return (NULL); + } + u.dlret = dlsym(ptr, symname); + if (u.dlret == NULL) { + DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE); + ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); + return (NULL); + } + return u.sym; +} + +static char *dlfcn_merger(DSO *dso, const char *filespec1, + const char *filespec2) +{ + char *merged; + + if (!filespec1 && !filespec2) { + DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER); + return (NULL); + } + /* + * If the first file specification is a rooted path, it rules. same goes + * if the second file specification is missing. + */ + if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) { + merged = OPENSSL_strdup(filespec1); + if (merged == NULL) { + DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); + return (NULL); + } + } + /* + * If the first file specification is missing, the second one rules. + */ + else if (!filespec1) { + merged = OPENSSL_strdup(filespec2); + if (merged == NULL) { + DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); + return (NULL); + } + } else { + /* + * This part isn't as trivial as it looks. It assumes that the + * second file specification really is a directory, and makes no + * checks whatsoever. Therefore, the result becomes the + * concatenation of filespec2 followed by a slash followed by + * filespec1. + */ + int spec2len, len; + + spec2len = strlen(filespec2); + len = spec2len + strlen(filespec1); + + if (spec2len && filespec2[spec2len - 1] == '/') { + spec2len--; + len--; + } + merged = OPENSSL_malloc(len + 2); + if (merged == NULL) { + DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); + return (NULL); + } + strcpy(merged, filespec2); + merged[spec2len] = '/'; + strcpy(&merged[spec2len + 1], filespec1); + } + return (merged); +} + +static char *dlfcn_name_converter(DSO *dso, const char *filename) +{ + char *translated; + int len, rsize, transform; + + len = strlen(filename); + rsize = len + 1; + transform = (strstr(filename, "/") == NULL); + if (transform) { + /* We will convert this to "%s.so" or "lib%s.so" etc */ + rsize += strlen(DSO_EXTENSION); /* The length of ".so" */ + if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) + rsize += 3; /* The length of "lib" */ + } + translated = OPENSSL_malloc(rsize); + if (translated == NULL) { + DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED); + return (NULL); + } + if (transform) { + if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) + sprintf(translated, "lib%s" DSO_EXTENSION, filename); + else + sprintf(translated, "%s" DSO_EXTENSION, filename); + } else + sprintf(translated, "%s", filename); + return (translated); +} + +# ifdef __sgi +/*- +This is a quote from IRIX manual for dladdr(3c): + + <dlfcn.h> does not contain a prototype for dladdr or definition of + Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional, + but contains no dladdr prototype and no IRIX library contains an + implementation. Write your own declaration based on the code below. + + The following code is dependent on internal interfaces that are not + part of the IRIX compatibility guarantee; however, there is no future + intention to change this interface, so on a practical level, the code + below is safe to use on IRIX. +*/ +# include <rld_interface.h> +# ifndef _RLD_INTERFACE_DLFCN_H_DLADDR +# define _RLD_INTERFACE_DLFCN_H_DLADDR +typedef struct Dl_info { + const char *dli_fname; + void *dli_fbase; + const char *dli_sname; + void *dli_saddr; + int dli_version; + int dli_reserved1; + long dli_reserved[4]; +} Dl_info; +# else +typedef struct Dl_info Dl_info; +# endif +# define _RLD_DLADDR 14 + +static int dladdr(void *address, Dl_info *dl) +{ + void *v; + v = _rld_new_interface(_RLD_DLADDR, address, dl); + return (int)v; +} +# endif /* __sgi */ + +static int dlfcn_pathbyaddr(void *addr, char *path, int sz) +{ +# ifdef HAVE_DLINFO + Dl_info dli; + int len; + + if (addr == NULL) { + union { + int (*f) (void *, char *, int); + void *p; + } t = { + dlfcn_pathbyaddr + }; + addr = t.p; + } + + if (dladdr(addr, &dli)) { + len = (int)strlen(dli.dli_fname); + if (sz <= 0) + return len + 1; + if (len >= sz) + len = sz - 1; + memcpy(path, dli.dli_fname, len); + path[len++] = 0; + return len; + } + + ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror()); +# endif + return -1; +} + +static void *dlfcn_globallookup(const char *name) +{ + void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY); + + if (handle) { + ret = dlsym(handle, name); + dlclose(handle); + } + + return ret; +} +#endif /* DSO_DLFCN */ |