--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com>
+ * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
+ * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#define _LGPL_SOURCE
+
+/* Has to be included first to override dlfcn.h */
+#include <common/compat/dlfcn.h>
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "common/elf.h"
+#include <lttng/ust-events.h>
+#include "common/macros.h"
+#include "common/logging.h"
+
+#include "liblttng-ust/ust-events-internal.h"
+
+/* Include link.h last else it conflicts with ust-dlfcn. */
+#include <link.h>
+
+#define TRACEPOINT_DEFINE
+#include "ust_dl.h"
+
+static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags);
+#ifdef HAVE_DLMOPEN
+static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename,
+ int flags);
+#endif
+static int (*__lttng_ust_plibc_dlclose)(void *handle);
+
+static
+void _lttng_ust_dl_init(void)
+ __attribute__((constructor));
+static
+void _lttng_ust_dl_init(void)
+{
+ ust_err_init();
+}
+
+static
+void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags)
+{
+ if (!__lttng_ust_plibc_dlopen) {
+ __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen");
+ if (!__lttng_ust_plibc_dlopen) {
+ fprintf(stderr, "%s\n", dlerror());
+ return NULL;
+ }
+ }
+ return __lttng_ust_plibc_dlopen(filename, flags);
+}
+
+#ifdef HAVE_DLMOPEN
+static
+void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename,
+ int flags)
+{
+ if (!__lttng_ust_plibc_dlmopen) {
+ __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen");
+ if (!__lttng_ust_plibc_dlmopen) {
+ fprintf(stderr, "%s\n", dlerror());
+ return NULL;
+ }
+ }
+ return __lttng_ust_plibc_dlmopen(nsid, filename, flags);
+}
+#endif
+
+static
+int _lttng_ust_dl_libc_dlclose(void *handle)
+{
+ if (!__lttng_ust_plibc_dlclose) {
+ __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose");
+ if (!__lttng_ust_plibc_dlclose) {
+ fprintf(stderr, "%s\n", dlerror());
+ return -1;
+ }
+ }
+ return __lttng_ust_plibc_dlclose(handle);
+}
+
+static
+void lttng_ust_dl_dlopen(void *so_base, const char *so_name,
+ int flags, void *ip)
+{
+ char resolved_path[PATH_MAX];
+ struct lttng_ust_elf *elf;
+ uint64_t memsz;
+ uint8_t *build_id = NULL;
+ size_t build_id_len;
+ char *dbg_file = NULL;
+ uint32_t crc;
+ int has_build_id = 0, has_debug_link = 0;
+ int ret;
+
+ if (!realpath(so_name, resolved_path)) {
+ ERR("could not resolve path '%s'", so_name);
+ return;
+ }
+
+ elf = lttng_ust_elf_create(resolved_path);
+ if (!elf) {
+ ERR("could not access file %s", resolved_path);
+ return;
+ }
+
+ ret = lttng_ust_elf_get_memsz(elf, &memsz);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_ust_elf_get_build_id(
+ elf, &build_id, &build_id_len, &has_build_id);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_ust_elf_get_debug_link(
+ elf, &dbg_file, &crc, &has_debug_link);
+ if (ret) {
+ goto end;
+ }
+
+ tracepoint(lttng_ust_dl, dlopen,
+ ip, so_base, resolved_path, flags, memsz,
+ has_build_id, has_debug_link);
+
+ if (has_build_id) {
+ tracepoint(lttng_ust_dl, build_id,
+ ip, so_base, build_id, build_id_len);
+ }
+
+ if (has_debug_link) {
+ tracepoint(lttng_ust_dl, debug_link,
+ ip, so_base, dbg_file, crc);
+ }
+
+end:
+ free(dbg_file);
+ free(build_id);
+ lttng_ust_elf_destroy(elf);
+ return;
+}
+
+#ifdef HAVE_DLMOPEN
+static
+void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name,
+ int flags, void *ip)
+{
+ char resolved_path[PATH_MAX];
+ struct lttng_ust_elf *elf;
+ uint64_t memsz;
+ uint8_t *build_id = NULL;
+ size_t build_id_len;
+ char *dbg_file = NULL;
+ uint32_t crc;
+ int has_build_id = 0, has_debug_link = 0;
+ int ret;
+
+ if (!realpath(so_name, resolved_path)) {
+ ERR("could not resolve path '%s'", so_name);
+ return;
+ }
+
+ elf = lttng_ust_elf_create(resolved_path);
+ if (!elf) {
+ ERR("could not access file %s", resolved_path);
+ return;
+ }
+
+ ret = lttng_ust_elf_get_memsz(elf, &memsz);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_ust_elf_get_build_id(
+ elf, &build_id, &build_id_len, &has_build_id);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_ust_elf_get_debug_link(
+ elf, &dbg_file, &crc, &has_debug_link);
+ if (ret) {
+ goto end;
+ }
+
+ tracepoint(lttng_ust_dl, dlmopen,
+ ip, so_base, nsid, resolved_path, flags, memsz,
+ has_build_id, has_debug_link);
+
+ if (has_build_id) {
+ tracepoint(lttng_ust_dl, build_id,
+ ip, so_base, build_id, build_id_len);
+ }
+
+ if (has_debug_link) {
+ tracepoint(lttng_ust_dl, debug_link,
+ ip, so_base, dbg_file, crc);
+ }
+
+end:
+ free(dbg_file);
+ free(build_id);
+ lttng_ust_elf_destroy(elf);
+ return;
+}
+#endif
+
+void *dlopen(const char *filename, int flags)
+{
+ void *handle;
+
+ handle = _lttng_ust_dl_libc_dlopen(filename, flags);
+ if (__tracepoint_ptrs_registered && handle) {
+ struct link_map *p = NULL;
+ int ret;
+
+ ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
+ if (ret != -1 && p != NULL && p->l_addr != 0) {
+ lttng_ust_dl_dlopen((void *) p->l_addr,
+ p->l_name, flags, LTTNG_UST_CALLER_IP());
+ }
+ }
+ lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
+ return handle;
+}
+
+#ifdef HAVE_DLMOPEN
+void *dlmopen(Lmid_t nsid, const char *filename, int flags)
+{
+ void *handle;
+
+ handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags);
+ if (__tracepoint_ptrs_registered && handle) {
+ struct link_map *p = NULL;
+ int ret;
+
+ ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
+ if (ret != -1 && p != NULL && p->l_addr != 0) {
+ lttng_ust_dl_dlmopen((void *) p->l_addr,
+ nsid, p->l_name, flags,
+ LTTNG_UST_CALLER_IP());
+ }
+ }
+ lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
+ return handle;
+
+}
+#endif
+
+int dlclose(void *handle)
+{
+ int ret;
+
+ if (__tracepoint_ptrs_registered) {
+ struct link_map *p = NULL;
+
+ ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
+ if (ret != -1 && p != NULL && p->l_addr != 0) {
+ tracepoint(lttng_ust_dl, dlclose,
+ LTTNG_UST_CALLER_IP(),
+ (void *) p->l_addr);
+ }
+ }
+ ret = _lttng_ust_dl_libc_dlclose(handle);
+ lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
+ return ret;
+}
projects / lttng-ust.git / blobdiff