/*
* char *dl_realpath(const char *path, char resolved[PATH_MAX]);
*
* Find the real name of path, by removing all ".", ".." and symlink
* components. Returns (resolved) on success, or (NULL) on failure,
* in which case the path which caused trouble is left in (resolved).
*/
char *
_dl_realpath(const char *path, char *resolved)
{
struct stat sb;
const char *p, *s;
char *q;
size_t left_len, resolved_len;
unsigned symlinks;
int slen, mem_allocated, ret;
char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX];
if (path[0] == '\0') {
return (NULL);
}
if (resolved == NULL) {
resolved = _dl_malloc(PATH_MAX);
if (resolved == NULL)
return (NULL);
mem_allocated = 1;
} else
mem_allocated = 0;
symlinks = 0;
if (path[0] == '/') {
resolved[0] = '/';
resolved[1] = '\0';
if (path[1] == '\0')
return (resolved);
resolved_len = 1;
left_len = _dl_strlcpy(left, path + 1, sizeof(left));
} else {
if (_dl_getcwd(resolved, PATH_MAX) <= 0) {
if (mem_allocated)
_dl_free(resolved);
else
_dl_strlcpy(resolved, ".", PATH_MAX);
return (NULL);
}
resolved_len = _dl_strlen(resolved);
left_len = _dl_strlcpy(left, path, sizeof(left));
}
if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) {
goto err;
}
/*
* Iterate over path components in `left'.
*/
while (left_len != 0) {
/*
* Extract the next path component and adjust `left'
* and its length.
*/
p = _dl_strchr(left, '/');
s = p ? p : left + left_len;
if (s - left >= sizeof(next_token)) {
goto err;
}
_dl_bcopy(left, next_token, s - left);
next_token[s - left] = '\0';
left_len -= s - left;
if (p != NULL)
_dl_bcopy(s + 1, left, left_len + 1);
if (resolved[resolved_len - 1] != '/') {
if (resolved_len + 1 >= PATH_MAX) {
goto err;
}
resolved[resolved_len++] = '/';
resolved[resolved_len] = '\0';
}
if (next_token[0] == '\0')
continue;
else if (_dl_strcmp(next_token, ".") == 0)
continue;
else if (_dl_strcmp(next_token, "..") == 0) {
/*
* Strip the last path component except when we have
* single "/"
*/
if (resolved_len > 1) {
resolved[resolved_len - 1] = '\0';
q = _dl_strrchr(resolved, '/') + 1;
*q = '\0';
resolved_len = q - resolved;
}
continue;
}
/*
* Append the next path component and lstat() it. If
* lstat() fails we still can return successfully if
* there are no more path components left.
*/
resolved_len = _dl_strlcat(resolved, next_token, PATH_MAX);
if (resolved_len >= PATH_MAX) {
goto err;
}
if ((ret = _dl_lstat(resolved, &sb)) != 0) {
if (ret == ENOENT && p == NULL) {
return (resolved);
}
goto err;
}
if (S_ISLNK(sb.st_mode)) {
if (symlinks++ > SYMLOOP_MAX) {
goto err;
}
slen = _dl_readlink(resolved, symlink, sizeof(symlink) - 1);
if (slen < 0)
goto err;
symlink[slen] = '\0';
if (symlink[0] == '/') {
resolved[1] = 0;
resolved_len = 1;
} else if (resolved_len > 1) {
/* Strip the last path component. */
resolved[resolved_len - 1] = '\0';
q = _dl_strrchr(resolved, '/') + 1;
*q = '\0';
resolved_len = q - resolved;
}
/*
* If there are any path components left, then
* append them to symlink. The result is placed
* in `left'.
*/
if (p != NULL) {
if (symlink[slen - 1] != '/') {
if (slen + 1 >= sizeof(symlink)) {
goto err;
}
symlink[slen] = '/';
symlink[slen + 1] = 0;
}
left_len = _dl_strlcat(symlink, left, sizeof(symlink));
if (left_len >= sizeof(left)) {
goto err;
}
}
left_len = _dl_strlcpy(left, symlink, sizeof(left));
}
}
/*
* Remove trailing slash except when the resolved pathname
* is a single "/".
*/
if (resolved_len > 1 && resolved[resolved_len - 1] == '/')
resolved[resolved_len - 1] = '\0';
return (resolved);
err:
if (mem_allocated)
_dl_free(resolved);
return (NULL);
}
struct elf_resolve *_dl_load_shared_library(unsigned int rflags, struct dyn_elf **rpnt,
struct elf_resolve *tpnt, char *full_libname, int attribute_unused trace_loaded_objects)
{
char *pnt;
struct elf_resolve *tpnt1;
char *libname;
_dl_internal_error_number = 0;
libname = full_libname;
/* quick hack to ensure mylibname buffer doesn't overflow. don't
allow full_libname or any directory to be longer than 1024. */
if (_dl_strlen(full_libname) > 1024)
goto goof;
/* Skip over any initial initial './' and '/' stuff to
* get the short form libname with no path garbage */
pnt = _dl_strrchr(libname, '/');
if (pnt) {
libname = pnt + 1;
}
_dl_if_debug_dprint("\tfind library='%s'; searching\n", libname);
/* If the filename has any '/', try it straight and leave it at that.
For IBCS2 compatibility under linux, we substitute the string
/usr/i486-sysv4/lib for /usr/lib in library names. */
if (libname != full_libname) {
_dl_if_debug_dprint("\ttrying file='%s'\n", full_libname);
tpnt1 = _dl_load_elf_shared_library(rflags, rpnt, full_libname);
if (tpnt1) {
return tpnt1;
}
}
/*
* The ABI specifies that RPATH is searched before LD_LIBRARY_PATH or
* the default path of /usr/lib. Check in rpath directories.
*/
#ifdef __LDSO_RUNPATH__
pnt = (tpnt ? (char *) tpnt->dynamic_info[DT_RPATH] : NULL);
if (pnt) {
pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, rflags, pnt, rpnt,
tpnt->libname)) != NULL)
return tpnt1;
}
#endif
#ifdef __LDSO_LD_LIBRARY_PATH__
/* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
if (_dl_library_path) {
_dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
if ((tpnt1 = search_for_named_library(libname, rflags, _dl_library_path, rpnt, NULL)) != NULL)
{
return tpnt1;
}
}
#endif
/*
* The ABI specifies that RUNPATH is searched after LD_LIBRARY_PATH.
*/
#ifdef __LDSO_RUNPATH__
pnt = (tpnt ? (char *)tpnt->dynamic_info[DT_RUNPATH] : NULL);
if (pnt) {
pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, rflags, pnt, rpnt, NULL)) != NULL)
return tpnt1;
}
#ifdef __LDSO_RUNPATH_OF_EXECUTABLE__
/*
* Try the DT_RPATH of the executable itself.
*/
pnt = (char *) _dl_loaded_modules->dynamic_info[DT_RPATH];
if (pnt) {
pnt += (unsigned long) _dl_loaded_modules->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching exe's RPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, rflags, pnt, rpnt, NULL)) != NULL)
return tpnt1;
}
#endif
#endif
/*
* Where should the cache be searched? There is no such concept in the
* ABI, so we have some flexibility here. For now, search it before
* the hard coded paths that follow (i.e before /lib and /usr/lib).
*/
#ifdef __LDSO_CACHE_SUPPORT__
if (_dl_cache_addr != NULL && _dl_cache_addr != MAP_FAILED) {
int i;
header_t *header = (header_t *) _dl_cache_addr;
libentry_t *libent = (libentry_t *) & header[1];
char *strs = (char *) &libent[header->nlibs];
_dl_if_debug_dprint("\tsearching cache='%s'\n", LDSO_CACHE);
for (i = 0; i < header->nlibs; i++) {
if ((libent[i].flags == LIB_ELF
|| libent[i].flags == LIB_ELF_LIBC0
|| libent[i].flags == LIB_ELF_LIBC5)
&& _dl_strcmp(libname, strs + libent[i].sooffset) == 0
&& (tpnt1 = _dl_load_elf_shared_library(rflags, rpnt, strs + libent[i].liboffset))
) {
return tpnt1;
}
}
}
#endif
#ifdef LDSO_MULTILIB_DIR
/* If multilib directory is selected, search it before falling back to
standard lib directories. */
_dl_if_debug_dprint("\tsearching multilib lib path list\n");
tpnt1 = search_for_named_library(libname, rflags,
UCLIBC_RUNTIME_PREFIX LDSO_MULTILIB_DIR ":"
UCLIBC_RUNTIME_PREFIX "usr/" LDSO_MULTILIB_DIR,
rpnt, NULL);
if (tpnt1 != NULL)
return tpnt1;
#endif
#if defined SHARED && defined __LDSO_SEARCH_INTERP_PATH__
/* Look for libraries wherever the shared library loader
* was installed */
_dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath);
tpnt1 = search_for_named_library(libname, rflags, _dl_ldsopath, rpnt, NULL);
if (tpnt1 != NULL)
return tpnt1;
#endif
/* Lastly, search the standard list of paths for the library.
This list must exactly match the list in uClibc/ldso/util/ldd.c */
_dl_if_debug_dprint("\tsearching full lib path list\n");
tpnt1 = search_for_named_library(libname, rflags,
UCLIBC_RUNTIME_PREFIX "lib:"
UCLIBC_RUNTIME_PREFIX "usr/lib"
#ifndef __LDSO_CACHE_SUPPORT__
":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
#endif
, rpnt, NULL);
if (tpnt1 != NULL)
return tpnt1;
#ifdef __LDSO_RUNPATH_OF_EXECUTABLE__
/* Very last resort, try the executable's DT_RUNPATH and DT_RPATH */
/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#shobj_dependencies
* The set of directories specified by a given DT_RUNPATH entry is
* used to find only the immediate dependencies of the executable or
* shared object containing the DT_RUNPATH entry. That is, it is
* used only for those dependencies contained in the DT_NEEDED
* entries of the dynamic structure containing the DT_RUNPATH entry,
* itself. One object's DT_RUNPATH entry does not affect the search
* for any other object's dependencies.
*
* glibc (around 2.19) violates this and the usual suspects are
* abusing this bug^Wrelaxed, user-friendly behaviour.
*/
pnt = (char *) _dl_loaded_modules->dynamic_info[DT_RUNPATH];
if (pnt) {
pnt += (unsigned long) _dl_loaded_modules->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching exe's RUNPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, rflags, pnt, rpnt, NULL)) != NULL)
return tpnt1;
}
pnt = (char *) _dl_loaded_modules->dynamic_info[DT_RPATH];
if (pnt) {
pnt += (unsigned long) _dl_loaded_modules->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching exe's RPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, rflags, pnt, rpnt, NULL)) != NULL)
return tpnt1;
}
#endif
goof:
/* Well, we shot our wad on that one. All we can do now is punt */
if (_dl_internal_error_number)
_dl_error_number = _dl_internal_error_number;
else
_dl_error_number = LD_ERROR_NOFILE;
_dl_if_debug_dprint("Bummer: could not find '%s'!\n", libname);
return NULL;
}
struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
struct elf_resolve *tpnt, char *full_libname, int attribute_unused trace_loaded_objects)
{
char *pnt;
struct elf_resolve *tpnt1;
char *libname;
_dl_internal_error_number = 0;
libname = full_libname;
/* quick hack to ensure mylibname buffer doesn't overflow. don't
allow full_libname or any directory to be longer than 1024. */
if (_dl_strlen(full_libname) > 1024)
goto goof;
/* Skip over any initial initial './' and '/' stuff to
* get the short form libname with no path garbage */
pnt = _dl_strrchr(libname, '/');
if (pnt) {
libname = pnt + 1;
}
_dl_if_debug_dprint("\tfind library='%s'; searching\n", libname);
/* If the filename has any '/', try it straight and leave it at that.
For IBCS2 compatibility under linux, we substitute the string
/usr/i486-sysv4/lib for /usr/lib in library names. */
if (libname != full_libname) {
_dl_if_debug_dprint("\ttrying file='%s'\n", full_libname);
tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
if (tpnt1) {
return tpnt1;
}
}
/*
* The ABI specifies that RPATH is searched before LD_LIBRARY_PATH or
* the default path of /usr/lib. Check in rpath directories.
*/
#ifdef __LDSO_RUNPATH__
pnt = (tpnt ? (char *) tpnt->dynamic_info[DT_RPATH] : NULL);
if (pnt) {
pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
return tpnt1;
}
#endif
/* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
if (_dl_library_path) {
_dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
{
return tpnt1;
}
}
/*
* The ABI specifies that RUNPATH is searched after LD_LIBRARY_PATH.
*/
#ifdef __LDSO_RUNPATH__
pnt = (tpnt ? (char *)tpnt->dynamic_info[DT_RUNPATH] : NULL);
if (pnt) {
pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
_dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt);
if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
return tpnt1;
}
#endif
/*
* Where should the cache be searched? There is no such concept in the
* ABI, so we have some flexibility here. For now, search it before
* the hard coded paths that follow (i.e before /lib and /usr/lib).
*/
#ifdef __LDSO_CACHE_SUPPORT__
if (_dl_cache_addr != NULL && _dl_cache_addr != MAP_FAILED) {
int i;
header_t *header = (header_t *) _dl_cache_addr;
libentry_t *libent = (libentry_t *) & header[1];
char *strs = (char *) &libent[header->nlibs];
_dl_if_debug_dprint("\tsearching cache='%s'\n", LDSO_CACHE);
for (i = 0; i < header->nlibs; i++) {
if ((libent[i].flags == LIB_ELF
|| libent[i].flags == LIB_ELF_LIBC0
|| libent[i].flags == LIB_ELF_LIBC5)
&& _dl_strcmp(libname, strs + libent[i].sooffset) == 0
&& (tpnt1 = _dl_load_elf_shared_library(secure, rpnt, strs + libent[i].liboffset))
) {
return tpnt1;
}
}
}
#endif
/* Look for libraries wherever the shared library loader
* was installed */
_dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath);
tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt);
if (tpnt1 != NULL)
return tpnt1;
/* Lastly, search the standard list of paths for the library.
This list must exactly match the list in uClibc/ldso/util/ldd.c */
_dl_if_debug_dprint("\tsearching full lib path list\n");
tpnt1 = search_for_named_library(libname, secure,
UCLIBC_RUNTIME_PREFIX "lib:"
UCLIBC_RUNTIME_PREFIX "usr/lib"
#ifndef __LDSO_CACHE_SUPPORT__
":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
#endif
, rpnt);
if (tpnt1 != NULL)
return tpnt1;
goof:
/* Well, we shot our wad on that one. All we can do now is punt */
if (_dl_internal_error_number)
_dl_error_number = _dl_internal_error_number;
else
_dl_error_number = LD_ERROR_NOFILE;
_dl_if_debug_dprint("Bummer: could not find '%s'!\n", libname);
return NULL;
}