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https://gitlab.torproject.org/tpo/core/tor.git
synced 2025-02-26 23:52:30 +01:00
063bea58bc
On platforms with the backtrace/backtrace_symbols_fd interface, Tor can now dump stack traces on assertion failure. By default, I log them to DataDir/stack_dump and to stderr.
157 lines
2.8 KiB
C
157 lines
2.8 KiB
C
/* Copyright (c) 2013, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "orconfig.h"
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#include "backtrace.h"
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#include "compat.h"
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#include "util.h"
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#ifdef HAVE_EXECINFO_H
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#include <execinfo.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && \
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defined(HAVE_BACKTRACE_SYMBOLS_FD) && defined(HAVE_SIGACTION)
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#define USE_BACKTRACE
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#endif
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#if !defined(USE_BACKTRACE)
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#define NO_BACKTRACE_IMPL
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#endif
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static char *bt_filename = NULL;
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static char *bt_version = NULL;
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#ifndef NO_BACKTRACE_IMPL
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/**DOCDOC*/
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static int
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open_bt_target(void)
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{
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int fd = -1;
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if (bt_filename)
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fd = open(bt_filename, O_WRONLY|O_CREAT|O_APPEND, 0700);
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return fd;
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}
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#endif
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/**DOCDOC*/
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static void
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bt_write(int fd, const char *s, ssize_t n)
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{
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int r;
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if (n < 0) n = strlen(s);
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r = write(STDERR_FILENO, s, n);
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if (fd >= 0)
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r = write(fd, s, n);
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(void)r;
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}
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#ifdef USE_BACKTRACE
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#define MAX_DEPTH 256
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static void *cb_buf[MAX_DEPTH];
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/**DOCDOC*/
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void
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dump_backtrace(const char *msg)
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{
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char timebuf[32];
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time_t t = time(NULL);
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int timebuf_len;
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int depth;
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int fd;
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if (!msg) msg = "unspecified crash";
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depth = backtrace(cb_buf, MAX_DEPTH);
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t /= 900; t *= 900; /* Round to the previous 15 minutes */
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timebuf[0] = '\0';
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timebuf_len = format_dec_number_sigsafe(t, timebuf, sizeof(timebuf));
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fd = open_bt_target();
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bt_write(fd, "========================================"
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"====================================\n", -1);
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bt_write(fd, bt_version, -1);
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bt_write(fd, " died around T=", -1);
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bt_write(fd, timebuf, timebuf_len);
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bt_write(fd, ": ", 2);
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bt_write(fd, msg, -1);
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bt_write(fd, "\n", 1);
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backtrace_symbols_fd(cb_buf, depth, STDERR_FILENO);
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if (fd >= 0)
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backtrace_symbols_fd(cb_buf, depth, fd);
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close(fd);
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}
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/**DOCDOC*/
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static int
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install_bt_handler(void)
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{
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/*XXXX add signal handlers */
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/*XXXX make this idempotent */
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return 0;
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}
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/**DOCDOC*/
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static void
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remove_bt_handler(void)
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{
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}
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#endif
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#ifdef NO_BACKTRACE_IMPL
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/**DOCDOC*/
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void
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dump_backtrace(const char *msg)
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{
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bt_write(-1, bt_version, -1);
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bt_write(-1, " died: ", -1);
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bt_write(-1, msg, -1);
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bt_write(-1, "\n", -1);
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}
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/**DOCDOC*/
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static int
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install_bt_handler(void)
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{
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return 0;
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}
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/**DOCDOC*/
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static void
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remove_bt_handler(void)
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{
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}
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#endif
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/**DOCDOC*/
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int
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configure_backtrace_handler(const char *filename, const char *tor_version)
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{
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tor_free(bt_filename);
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if (filename)
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bt_filename = tor_strdup(filename);
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tor_free(bt_version);
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if (!tor_version)
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tor_version = "Tor";
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bt_version = tor_strdup(tor_version);
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return install_bt_handler();
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}
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/**DOCDOC*/
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void
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clean_up_backtrace_handler(void)
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{
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remove_bt_handler();
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tor_free(bt_filename);
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tor_free(bt_version);
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}
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