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/*
* Oracle Linux DTrace.
* Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
#include <sys/ptrace.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <libproc.h>
#include <rtld_db.h>
static int libs_seen;
struct rd_and_p {
struct ps_prochandle *P;
rd_agent_t *rd;
};
static int
print_ldd(const rd_loadobj_t *loadobj, size_t num, void *state)
{
struct rd_and_p *rp = state;
size_t i;
char buf[PATH_MAX];
rd_loadobj_t scope = {0};
if (Pread_string(rp->P, buf, sizeof(buf), loadobj->rl_nameaddr) < 0) {
fprintf(stderr, "Failed to read string at %lx\n",
loadobj->rl_nameaddr);
return 0;
}
/*
* No name, no search path: vDSO, we don't care about it.
*/
if (buf[0] == '\0' && loadobj->rl_nscopes == 1)
return 1;
/*
* Second item, no search path: vDSO (later glibc version).
*/
if ((num == 1) && (loadobj->rl_nscopes == 1))
return 1;
printf("%s: dyn 0x%lx, bias 0x%lx, LMID %li: %s (", buf, loadobj->rl_dyn,
loadobj->rl_diff_addr, loadobj->rl_lmident, loadobj->rl_default_scope ?
"inherited symbol search path: ": "symbol search path: ");
for (i = 0; i < loadobj->rl_nscopes; i++) {
if (rd_get_scope(rp->rd, &scope, loadobj, i) == NULL)
fprintf(stderr, "Scope %li -> NULL\n", i);
else {
if (Pread_string(rp->P, buf, sizeof(buf), scope.rl_nameaddr) < 0) {
fprintf(stderr, "Failed to read string at %lx\n",
scope.rl_nameaddr);
return 0;
}
printf("%s%s", i > 0 ? ", ": "", buf);
}
}
free(scope.rl_scope);
printf(")\n");
libs_seen++;
return 1;
}
static int
note_ldd(const rd_loadobj_t *loadobj, size_t num, void *state)
{
struct rd_and_p *rp = state;
char buf[PATH_MAX];
if (Pread_string(rp->P, buf, sizeof(buf), loadobj->rl_nameaddr) < 0) {
fprintf(stderr, "Failed to read string at %lx\n",
loadobj->rl_nameaddr);
return 0;
}
/*
* No name, no search path: vDSO, we don't care about it.
*/
if (buf[0] == '\0' && loadobj->rl_nscopes == 1)
return 1;
/*
* Second item, no search path: vDSO (later glibc version).
*/
if ((num == 1) && (loadobj->rl_nscopes == 1))
return 1;
libs_seen++;
return 1;
}
static int
do_nothing(const rd_loadobj_t *loadobj, size_t num, void *state)
{
return 1;
}
int
main(int argc, char *argv[])
{
long pid;
struct ps_prochandle *P;
struct rd_agent *rd;
int err;
int really_seen;
struct rd_and_p rp;
if (argc < 2) {
fprintf(stderr, "Syntax: libproc-pldd PID | process [args ...]\n");
exit(1);
}
pid = strtol(argv[1], NULL, 10);
if (!pid)
P = Pcreate(argv[1], &argv[1], NULL, &err);
else
P = Pgrab(pid, 0, 0, NULL, &err);
if (!P) {
fprintf(stderr, "Cannot execute: %s\n", strerror(err));
exit(1);
}
rd = rd_new(P);
if (!rd) {
fprintf(stderr, "Initialization failed.\n");
return 1;
}
rp.P = P;
rp.rd = rd;
/*
* Iterate immediately after initialization to enure that, whether we
* get RD_OK or RD_NOMAPS, we do not get a crash. (Note: this may
* resume, briefly, in order to ensure that we get a consistent state.)
*/
switch (rd_loadobj_iter(rd, do_nothing, &rp)) {
case RD_OK:
case RD_NOMAPS:
break;
case RD_ERR:
fprintf(stderr, "Unknown error.\n");
break;
}
Ptrace_set_detached(P, 1);
Puntrace(P, 0);
/*
* Now iterate and print.
*/
while (rd_loadobj_iter(rd, print_ldd, &rp) == RD_NOMAPS)
sleep (1);
really_seen = libs_seen;
/*
* Kill rtld_db (disconnecting from the ptrace()d process),
* then recreate it and iterate, ensuring that librtld_db can reattach
* on its own if it needs to.
*/
rd_free(rd);
rd = rd_new(P);
if (!rd) {
fprintf(stderr, "rd reinitialization failed.\n");
return 1;
}
while (rd_loadobj_iter(rd, note_ldd, &rp) == RD_NOMAPS)
sleep (1);
printf("%i libs seen.\n", really_seen);
if (libs_seen != really_seen * 2)
fprintf(stderr, "Post-reattachment initialization saw %i libs, "
"where first scan saw %i\n", libs_seen - really_seen,
really_seen);
Prelease(P, (pid == 0) ? PS_RELEASE_KILL : PS_RELEASE_NORMAL);
Pfree(P);
return 0;
}
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