#define TCB_SIGTRAPPED 00200 /* Process wanted to block SIGTRAP */
#define TCB_FOLLOWFORK 00400 /* Process should have forks followed */
#define TCB_REPRINT 01000 /* We should reprint this syscall on exit */
+#define TCB_FILTERED 02000 /* This system call has been filtered out */
#ifdef LINUX
/* x86 does not need TCB_WAITEXECVE.
* It can detect execve's SIGTRAP by looking at eax/rax.
|| defined(POWERPC) || defined(IA64) || defined(HPPA) \
|| defined(SH) || defined(SH64) || defined(S390) || defined(S390X) \
|| defined(ARM) || defined(MIPS) || defined(BFIN) || defined(TILE)
-# define TCB_WAITEXECVE 02000 /* ignore SIGTRAP after exceve */
+# define TCB_WAITEXECVE 04000 /* ignore SIGTRAP after exceve */
# endif
# define TCB_CLONE_THREAD 010000 /* CLONE_THREAD set in creating syscall */
# define TCB_GROUP_EXITING 020000 /* TCB_EXITING was exit_group, not _exit */
#define syserror(tcp) ((tcp)->u_error != 0)
#define verbose(tcp) (qual_flags[(tcp)->scno] & QUAL_VERBOSE)
#define abbrev(tcp) (qual_flags[(tcp)->scno] & QUAL_ABBREV)
+#define filtered(tcp) ((tcp)->flags & TCB_FILTERED)
struct xlat {
int val;
#ifdef HAVE_SIGINFO_T
extern void printsiginfo(siginfo_t *, int);
#endif
+extern const char *getfdpath(struct tcb *, int);
extern void printfd(struct tcb *, int);
extern void printsock(struct tcb *, long, int);
extern void print_sock_optmgmt(struct tcb *, long, int);
extern const char *sprint_open_modes(mode_t);
extern int is_restart_error(struct tcb *);
+extern int pathtrace_select(const char *);
+extern int pathtrace_match(struct tcb *);
+
extern int change_syscall(struct tcb *, int);
extern int internal_fork(struct tcb *);
extern int internal_exec(struct tcb *);
#endif
extern int not_failing_only;
+extern int show_fd_path;
+extern int tracing_paths;
--- /dev/null
+/*
+ * Copyright (c) 2011, Comtrol Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "defs.h"
+
+#include <ctype.h>
+#include <limits.h>
+
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#ifdef HAVE_SYS_POLL_H
+#include <sys/poll.h>
+#endif
+
+#include "syscall.h"
+
+#define NumElem(a) ((int)((sizeof (a))/((sizeof (a)[0]))))
+
+#define MAXSELECTED 256 /* max number of "selected" paths */
+static const char *selected[MAXSELECTED]; /* paths selected for tracing */
+
+/*
+ * Return true if specified path matches one that we're tracing.
+ */
+static int
+pathmatch(const char *path)
+{
+ int i;
+
+ for (i = 0; i < NumElem(selected); ++i)
+ {
+ if (selected[i] == NULL)
+ return 0;
+ if (!strcmp(path, selected[i]))
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Return true if specified path (in user-space) matches.
+ */
+static int
+upathmatch(struct tcb *tcp, unsigned long upath)
+{
+ char path[PATH_MAX + 1];
+
+ return umovestr(tcp, upath, sizeof path, path) == 0 &&
+ pathmatch(path);
+}
+
+/*
+ * Return true if specified fd maps to a path we're tracing.
+ */
+static int
+fdmatch(struct tcb *tcp, int fd)
+{
+ const char *path = getfdpath(tcp, fd);
+
+ return path && pathmatch(path);
+}
+
+/*
+ * Add a path to the set we're tracing.
+ * Secifying NULL will delete all paths.
+ */
+static int
+storepath(const char *path)
+{
+ int i;
+
+ if (path == NULL)
+ {
+ for (i = 0; i < NumElem(selected); ++i)
+ if (selected[i])
+ {
+ free((char *) selected[i]);
+ selected[i] = NULL;
+ }
+ return 0;
+ }
+
+ for (i = 0; i < NumElem(selected); ++i)
+ if (!selected[i])
+ {
+ selected[i] = path;
+ return 0;
+ }
+
+ fprintf(stderr, "Max trace paths exceeded, only using first %d\n",
+ NumElem(selected));
+ return -1;
+}
+
+/*
+ * Get path associated with fd.
+ */
+const char *getfdpath(struct tcb *tcp, int fd)
+{
+#ifdef LINUX
+ static char path[PATH_MAX+1];
+ char linkpath[64];
+ ssize_t n;
+
+ if (fd < 0)
+ return NULL;
+
+ snprintf(linkpath, sizeof linkpath, "/proc/%d/fd/%d", tcp->pid, fd);
+ n = readlink(linkpath, path, (sizeof path) - 1);
+ if (n <= 0)
+ return NULL;
+ path[n] = '\0';
+ return path;
+#else
+ return NULL;
+#endif
+}
+
+/*
+ * Add a path to the set we're tracing. Also add the canonicalized
+ * version of the path. Secifying NULL will delete all paths.
+ */
+int
+pathtrace_select(const char *path)
+{
+ char *rpath;
+
+ if (path == NULL)
+ return storepath(path);
+
+ if (storepath(path))
+ return -1;
+
+ rpath = realpath(path, NULL);
+
+ if (rpath == NULL)
+ return 0;
+
+ /* if realpath and specified path are same, we're done */
+ if (!strcmp(path, rpath))
+ {
+ free(rpath);
+ return 0;
+ }
+
+ fprintf(stderr, "Requested path '%s' resolved into '%s'\n",
+ path, rpath);
+ return storepath(rpath);
+}
+
+/*
+ * Return true if syscall accesses a selected path
+ * (or if no paths have been specified for tracing).
+ */
+int
+pathtrace_match(struct tcb *tcp)
+{
+ const struct sysent *s;
+
+ if (selected[0] == NULL)
+ return 1;
+
+ s = &sysent[tcp->scno];
+
+ if (!(s->sys_flags & (TRACE_FILE | TRACE_DESC)))
+ return 0;
+
+ /*
+ * Check for special cases where we need to do something
+ * other than test arg[0].
+ */
+
+#ifdef LINUX
+
+ if (s->sys_func == sys_dup2 ||
+ s->sys_func == sys_dup3 ||
+ s->sys_func == sys_sendfile ||
+ s->sys_func == sys_sendfile64 ||
+ !strcmp(s->sys_name, "tee"))
+ {
+ /* fd, fd */
+ return fdmatch(tcp, tcp->u_arg[0]) ||
+ fdmatch(tcp, tcp->u_arg[1]);
+ }
+
+ if (s->sys_func == sys_inotify_add_watch ||
+ s->sys_func == sys_faccessat ||
+ s->sys_func == sys_fchmodat ||
+ s->sys_func == sys_futimesat ||
+ s->sys_func == sys_mkdirat ||
+ s->sys_func == sys_unlinkat ||
+ s->sys_func == sys_newfstatat ||
+ s->sys_func == sys_mknodat ||
+ s->sys_func == sys_openat ||
+ s->sys_func == sys_readlinkat ||
+ s->sys_func == sys_utimensat ||
+ s->sys_func == sys_fchownat ||
+ s->sys_func == sys_pipe2)
+ {
+ /* fd, path */
+ return fdmatch(tcp, tcp->u_arg[0]) ||
+ upathmatch(tcp, tcp->u_arg[1]);
+ }
+
+ if (s->sys_func == sys_link ||
+ s->sys_func == sys_pivotroot ||
+ s->sys_func == sys_rename ||
+ s->sys_func == sys_symlink ||
+ s->sys_func == sys_mount)
+ {
+ /* path, path */
+ return upathmatch(tcp, tcp->u_arg[0]) ||
+ upathmatch(tcp, tcp->u_arg[1]);
+ }
+
+ if (s->sys_func == sys_renameat ||
+ s->sys_func == sys_linkat)
+ {
+ /* fd, path, fd, path */
+ return fdmatch(tcp, tcp->u_arg[0]) ||
+ fdmatch(tcp, tcp->u_arg[2]) ||
+ upathmatch(tcp, tcp->u_arg[1]) ||
+ upathmatch(tcp, tcp->u_arg[3]);
+ }
+
+ if (s->sys_func == sys_old_mmap || s->sys_func == sys_mmap)
+ {
+ /* x, x, x, x, fd */
+ return fdmatch(tcp, tcp->u_arg[4]);
+ }
+
+ if (s->sys_func == sys_symlinkat)
+ {
+ /* path, fd, path */
+ return fdmatch(tcp, tcp->u_arg[1]) ||
+ upathmatch(tcp, tcp->u_arg[0]) ||
+ upathmatch(tcp, tcp->u_arg[2]);
+ }
+
+ if (!strcmp(s->sys_name, "splice"))
+ {
+ /* fd, x, fd, x, x */
+ return fdmatch(tcp, tcp->u_arg[0]) ||
+ fdmatch(tcp, tcp->u_arg[2]);
+ }
+
+ if (s->sys_func == sys_epoll_ctl)
+ {
+ /* x, x, fd, x */
+ return fdmatch(tcp, tcp->u_arg[2]);
+ }
+
+ if (s->sys_func == sys_select ||
+ s->sys_func == sys_oldselect ||
+ s->sys_func == sys_pselect6)
+ {
+ int i, j, nfds;
+ long *args, oldargs[5];
+ unsigned fdsize;
+ fd_set *fds;
+
+ if (s->sys_func == sys_oldselect)
+ {
+ if (umoven(tcp, tcp->u_arg[0], sizeof oldargs,
+ (char*) oldargs) < 0)
+ {
+ fprintf(stderr, "umoven() failed\n");
+ return 0;
+ }
+ args = oldargs;
+ } else
+ args = tcp->u_arg;
+
+ nfds = args[0];
+ fdsize = ((((nfds + 7) / 8) + sizeof(long) - 1)
+ & -sizeof(long));
+ fds = malloc(fdsize);
+
+ if (fds == NULL)
+ {
+ fprintf(stderr, "out of memory\n");
+ return 0;
+ }
+
+ for (i = 1; i <= 3; ++i)
+ {
+ if (args[i] == 0)
+ continue;
+
+ if (umoven(tcp, args[i], fdsize, (char *) fds) < 0)
+ {
+ fprintf(stderr, "umoven() failed\n");
+ continue;
+ }
+
+ for (j = 0; j < nfds; ++j)
+ if (FD_ISSET(j, fds) && fdmatch(tcp, j))
+ {
+ free(fds);
+ return 1;
+ }
+ }
+ free(fds);
+ return 0;
+ }
+
+ if (s->sys_func == sys_poll ||
+ s->sys_func == sys_ppoll)
+ {
+ struct pollfd fds;
+ unsigned nfds;
+ unsigned long start, cur, end;
+
+ start = tcp->u_arg[0];
+ nfds = tcp->u_arg[1];
+
+ end = start + sizeof(fds) * nfds;
+
+ if (nfds == 0 || end < start)
+ return 0;
+
+ for (cur = start; cur < end; cur += sizeof(fds))
+ if ((umoven(tcp, cur, sizeof fds, (char *) &fds) == 0)
+ && fdmatch(tcp, fds.fd))
+ return 1;
+
+ return 0;
+ }
+
+ if (s->sys_func == printargs ||
+ s->sys_func == sys_pipe ||
+ s->sys_func == sys_pipe2 ||
+ s->sys_func == sys_eventfd2 ||
+ s->sys_func == sys_eventfd ||
+ s->sys_func == sys_inotify_init1 ||
+ s->sys_func == sys_timerfd_create ||
+ s->sys_func == sys_timerfd_settime ||
+ s->sys_func == sys_timerfd_gettime ||
+ s->sys_func == sys_epoll_create ||
+ !strcmp(s->sys_name, "fanotify_init"))
+ {
+ /*
+ * These have TRACE_FILE or TRACE_DESCRIPTOR set, but they
+ * don't have any file descriptor or path args to test.
+ */
+ return 0;
+ }
+#else
+#warning "path tracing only using arg[0]"
+#endif
+
+ /*
+ * Our fallback position for calls that haven't already
+ * been handled is to just check arg[0].
+ */
+
+ if (s->sys_flags & TRACE_FILE)
+ return upathmatch(tcp, tcp->u_arg[0]);
+
+ if (s->sys_flags & TRACE_DESC)
+ return fdmatch(tcp, tcp->u_arg[0]);
+
+ return 0;
+}
/* Sometimes we want to print only succeeding syscalls. */
int not_failing_only = 0;
+/* Show path associated with fd arguments */
+int show_fd_path = 0;
+
+/* are we filtering traces based on paths? */
+int tracing_paths = 0;
+
static int exit_code = 0;
static int strace_child = 0;
int exitval;
{
fprintf(ofp, "\
-usage: strace [-CdDffhiqrtttTvVxx] [-a column] [-e expr] ... [-o file]\n\
+usage: strace [-CdDffhiqrtttTvVxxy] [-a column] [-e expr] ... [-o file]\n\
[-p pid] ... [-s strsize] [-u username] [-E var=val] ...\n\
- [command [arg ...]]\n\
+ [-P path] [command [arg ...]]\n\
or: strace -c [-D] [-e expr] ... [-O overhead] [-S sortby] [-E var=val] ...\n\
[command [arg ...]]\n\
-c -- count time, calls, and errors for each syscall and report summary\n\
-T -- print time spent in each syscall, -V -- print version\n\
-v -- verbose mode: print unabbreviated argv, stat, termio[s], etc. args\n\
-x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\
+-y -- print paths associated with file descriptor arguments\n\
-a column -- alignment COLUMN for printing syscall results (default %d)\n\
-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\
options: trace, abbrev, verbose, raw, signal, read, or write\n\
-u username -- run command as username handling setuid and/or setgid\n\
-E var=val -- put var=val in the environment for command\n\
-E var -- remove var from the environment for command\n\
+-P path -- trace accesses to path\n\
" /* this is broken, so don't document it
-z -- print only succeeding syscalls\n\
*/
qualify("verbose=all");
qualify("signal=all");
while ((c = getopt(argc, argv,
- "+cCdfFhiqrtTvVxz"
+ "+cCdfFhiqrtTvVxyz"
#ifndef USE_PROCFS
"D"
#endif
- "a:e:o:O:p:s:S:u:E:")) != EOF) {
+ "a:e:o:O:p:s:S:u:E:P:")) != EOF) {
switch (c) {
case 'c':
if (cflag == CFLAG_BOTH) {
case 'x':
xflag++;
break;
+ case 'y':
+ show_fd_path = 1;
+ break;
case 'v':
qualify("abbrev=none");
break;
tcp->flags |= TCB_ATTACHED;
pflag_seen++;
break;
+ case 'P':
+ tracing_paths = 1;
+ if (pathtrace_select(optarg)) {
+ fprintf(stderr,"%s : failed to select path '%s'\n", progname, optarg);
+ exit(1);
+ }
+ break;
case 's':
max_strlen = atoi(optarg);
if (max_strlen < 0) {
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