depend.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <wait.h>
#include <limits.h>
#include <gelf.h>
#include "machdep.h"
#include "sgs.h"
#include "conv.h"
#include "_crle.h"
#include "msg.h"
/*
* Establish an association between a filter and filtee. Both the filter and
* filtee already exist in the internal hash table, since auditing registers
* objects (la_objopen()) before it registers filters (la_objfilter()).
*/
static int
filter(Crle_desc *crle, const char *filter, const char *str, const char *filtee)
{
Hash_ent * fltrent, * flteent;
Flt_desc * flt;
Listnode * lnp;
/*
* Locate the filter. Mark the underlying object as the filter to
* reflect that no matter how it is referenced, it's a filter.
*/
if ((fltrent = get_hash(crle->c_strtbl, (Addr)filter, 0,
HASH_FND_ENT)) == 0)
return (1);
if ((fltrent = get_hash(crle->c_strtbl, (Addr)fltrent->e_obj->o_path, 0,
HASH_FND_ENT)) == 0)
return (1);
fltrent->e_obj->o_flags |= RTC_OBJ_FILTER;
/*
* Locate the filtee. Mark the referencing object as the filtee, as
* this is the object referenced by the filter.
*/
if ((flteent = get_hash(crle->c_strtbl, (Addr)filtee, 0,
HASH_FND_ENT)) == 0)
return (1);
flteent->e_flags |= RTC_OBJ_FILTEE;
/*
* Traverse the filter list using the filters real name. If ld.so.1
* inspects the resulting configuration file for filters, it's the
* objects real name that will be used (PATHNAME()).
*/
for (LIST_TRAVERSE(&(crle->c_flt), lnp, flt)) {
/*
* Determine whether this filter and filtee string pair already
* exist.
*/
if ((strcmp(flt->f_fent->e_obj->o_path,
fltrent->e_obj->o_path) != 0) &&
(strcmp(flt->f_str, str) != 0))
continue;
/*
* Add this filtee additional association.
*/
if (list_append(&(flt->f_filtee), flteent) == 0)
return (1);
crle->c_fltenum++;
return (0);
}
/*
* This is a new filter descriptor. Add this new filtee association.
*/
if (((flt = malloc(sizeof (Flt_desc))) == 0) ||
((flt->f_strsz = strlen(str) + 1) == 0) ||
((flt->f_str = malloc(flt->f_strsz)) == 0)) {
int err = errno;
(void) fprintf(stderr, MSG_INTL(MSG_SYS_MALLOC),
crle->c_name, strerror(err));
return (1);
}
if ((list_append(&(crle->c_flt), flt) == 0) ||
(list_append(&(flt->f_filtee), flteent) == 0))
return (1);
flt->f_fent = fltrent;
(void) memcpy((void *)flt->f_str, (void *)str, flt->f_strsz);
crle->c_strsize += flt->f_strsz;
crle->c_fltrnum += 1;
crle->c_fltenum += 2; /* Account for null filtee desc. */
return (0);
}
/*
* Establish the dependencies of an ELF object and add them to the internal
* configuration information. This information is gathered by using libcrle.so.1
* as an audit library - this is akin to using ldd(1) only simpler.
*/
int
depend(Crle_desc *crle, const char *name, Half flags, GElf_Ehdr *ehdr)
{
const char *exename;
const char *preload;
int fildes[2], pid;
/*
* If we're dealing with a dynamic executable we'll execute it,
* otherwise we'll preload the shared object with one of the lddstub's.
*/
if (ehdr->e_type == ET_EXEC) {
exename = name;
preload = 0;
} else {
exename = conv_lddstub(crle->c_class);
preload = name;
}
/*
* Set up a pipe through which the audit library will write the
* dependencies.
*/
if (pipe(fildes) == -1) {
int err = errno;
(void) fprintf(stderr, MSG_INTL(MSG_SYS_PIPE),
crle->c_name, strerror(err));
return (1);
}
/*
* Fork ourselves to run our executable and collect its dependencies.
*/
if ((pid = fork()) == -1) {
int err = errno;
(void) fprintf(stderr, MSG_INTL(MSG_SYS_FORK),
crle->c_name, strerror(err));
return (1);
}
if (pid) {
/*
* Parent. Read each dependency from the audit library. The read
* side of the pipe is attached to stdio to make obtaining the
* individual dependencies easier.
*/
int error = 0, status;
FILE *fd;
char buffer[PATH_MAX];
(void) close(fildes[1]);
if ((fd = fdopen(fildes[0], MSG_ORIG(MSG_STR_READ))) != NULL) {
char *str;
while (fgets(buffer, PATH_MAX, fd) != NULL) {
/*
* Make sure we recognize the message, remove
* the newline (which allowed fgets() use) and
* register the name;
*/
if (strncmp(MSG_ORIG(MSG_AUD_PRF), buffer,
MSG_AUD_PRF_SIZE))
continue;
str = strrchr(buffer, '\n');
*str = '\0';
str = buffer + MSG_AUD_PRF_SIZE;
if (strncmp(MSG_ORIG(MSG_AUD_DEPEND),
str, MSG_AUD_DEPEND_SIZE) == 0) {
/*
* Process any dependencies.
*/
str += MSG_AUD_DEPEND_SIZE;
if ((error = inspect(crle, str,
(flags & ~RTC_OBJ_GROUP))) != 0)
break;
} else if (strncmp(MSG_ORIG(MSG_AUD_FILTER),
str, MSG_AUD_FILTER_SIZE) == 0) {
char *_flt, *_str;
/*
* Process any filters.
*/
_flt = str += MSG_AUD_FILTER_SIZE;
_str = strchr(str, ':');
*_str++ = '\0'; str = _str++;
str = strrchr(str, ')');
*str++ = '\0'; str++;
if ((error = filter(crle, _flt, _str,
str)) != 0)
break;
}
}
} else
error = errno;
while (wait(&status) != pid)
;
if (status) {
if (WIFSIGNALED(status)) {
(void) fprintf(stderr,
MSG_INTL(MSG_SYS_EXEC), crle->c_name,
exename, (WSIGMASK & status),
((status & WCOREFLG) ?
MSG_INTL(MSG_SYS_CORE) :
MSG_ORIG(MSG_STR_EMPTY)));
}
error = status;
}
(void) fclose(fd);
return (error);
} else {
char efds[MSG_ENV_AUD_FD_SIZE + 10];
char epld[PATH_MAX];
char eldf[PATH_MAX];
(void) close(fildes[0]);
/*
* Child. Set up environment variables to enable and identify
* auditing. Initialize CRLE_FD and LD_FLAGS strings.
*/
(void) snprintf(efds, (MSG_ENV_AUD_FD_SIZE + 10),
MSG_ORIG(MSG_ENV_AUD_FD), fildes[1]);
(void) snprintf(eldf, PATH_MAX, MSG_ORIG(MSG_ENV_LD_FLAGS));
/*
* If asked to dump a group of dependencies make sure any
* lazily-loaded objects get processed - (append loadavail to
* LD_FLAGS=confgen).
*/
if (flags & RTC_OBJ_GROUP)
(void) strcat(eldf, MSG_ORIG(MSG_LDFLG_LOADAVAIL));
/*
* Put LD_PRELOAD= in the environment if necessary.
*/
if (preload) {
(void) snprintf(epld, PATH_MAX,
MSG_ORIG(MSG_ENV_LD_PRELOAD), preload);
}
/*
* Put strings in the environment for exec().
* NOTE, use of automatic variables for construction of the
* environment variables is legitimate here, as they are local
* to the child process and are established solely for exec().
*/
if ((putenv(efds) != 0) || (putenv(crle->c_audit) != 0) ||
(putenv(eldf) != 0) || (preload && (putenv(epld) != 0))) {
int err = errno;
(void) fprintf(stderr, MSG_INTL(MSG_SYS_PUTENV),
crle->c_name, strerror(err));
return (1);
}
if (execlp(exename, exename, 0) == -1) {
_exit(errno);
/* NOTREACHED */
}
}
/* NOTREACHED */
}