344 lines
9.2 KiB
C
344 lines
9.2 KiB
C
/*
|
|
* Copryight 1997 Sean Eric Fagan
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Sean Eric Fagan
|
|
* 4. Neither the name of the author may be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* The main module for truss. Suprisingly simple, but, then, the other
|
|
* files handle the bulk of the work. And, of course, the kernel has to
|
|
* do a lot of the work :).
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/pioctl.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "truss.h"
|
|
#include "extern.h"
|
|
|
|
/*
|
|
* It's difficult to parameterize this because it must be
|
|
* accessible in a signal handler.
|
|
*/
|
|
|
|
int Procfd;
|
|
|
|
static __inline void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "%s\n%s\n",
|
|
"usage: truss [-faedDS] [-o file] -p pid",
|
|
" truss [-faedDS] [-o file] command [args]");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* WARNING! "FreeBSD a.out" must be first, or set_etype will not
|
|
* work correctly.
|
|
*/
|
|
struct ex_types {
|
|
const char *type;
|
|
void (*enter_syscall)(struct trussinfo *, int);
|
|
long (*exit_syscall)(struct trussinfo *, int);
|
|
} ex_types[] = {
|
|
#ifdef __alpha__
|
|
{ "FreeBSD ELF", alpha_syscall_entry, alpha_syscall_exit },
|
|
#endif
|
|
#ifdef __amd64__
|
|
{ "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit },
|
|
#endif
|
|
#ifdef __i386__
|
|
{ "FreeBSD a.out", i386_syscall_entry, i386_syscall_exit },
|
|
{ "FreeBSD ELF", i386_syscall_entry, i386_syscall_exit },
|
|
{ "FreeBSD ELF32", i386_syscall_entry, i386_syscall_exit },
|
|
{ "Linux ELF", i386_linux_syscall_entry, i386_linux_syscall_exit },
|
|
#endif
|
|
#ifdef __ia64__
|
|
{ "FreeBSD ELF64", ia64_syscall_entry, ia64_syscall_exit },
|
|
#endif
|
|
#ifdef __sparc64__
|
|
{ "FreeBSD ELF64", sparc64_syscall_entry, sparc64_syscall_exit },
|
|
#endif
|
|
{ 0, 0, 0 },
|
|
};
|
|
|
|
/*
|
|
* Set the execution type. This is called after every exec, and when
|
|
* a process is first monitored. The procfs pseudo-file "etype" has
|
|
* the execution module type -- see /proc/curproc/etype for an example.
|
|
*/
|
|
|
|
static struct ex_types *
|
|
set_etype(struct trussinfo *trussinfo) {
|
|
struct ex_types *funcs;
|
|
char etype[24];
|
|
char progt[32];
|
|
int fd;
|
|
|
|
sprintf(etype, "/proc/%d/etype", trussinfo->pid);
|
|
if ((fd = open(etype, O_RDONLY)) == -1) {
|
|
strcpy(progt, "FreeBSD a.out");
|
|
} else {
|
|
int len = read(fd, progt, sizeof(progt));
|
|
progt[len-1] = '\0';
|
|
close(fd);
|
|
}
|
|
|
|
for (funcs = ex_types; funcs->type; funcs++)
|
|
if (!strcmp(funcs->type, progt))
|
|
break;
|
|
|
|
if (funcs->type == NULL) {
|
|
funcs = &ex_types[0];
|
|
warn("execution type %s is not supported -- using %s",
|
|
progt, funcs->type);
|
|
}
|
|
return funcs;
|
|
}
|
|
|
|
char *
|
|
strsig(int sig)
|
|
{
|
|
char *ret;
|
|
|
|
ret = NULL;
|
|
if (sig > 0 && sig < NSIG) {
|
|
int i;
|
|
asprintf(&ret, "sig%s", sys_signame[sig]);
|
|
if (ret == NULL)
|
|
return (NULL);
|
|
for (i = 0; ret[i] != '\0'; ++i)
|
|
ret[i] = toupper(ret[i]);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
main(int ac, char **av) {
|
|
int c;
|
|
int i;
|
|
char **command;
|
|
struct procfs_status pfs;
|
|
struct ex_types *funcs;
|
|
int in_exec = 0;
|
|
char *fname = NULL;
|
|
int sigexit = 0;
|
|
struct trussinfo *trussinfo;
|
|
char *signame;
|
|
|
|
/* Initialize the trussinfo struct */
|
|
trussinfo = (struct trussinfo *)malloc(sizeof(struct trussinfo));
|
|
if (trussinfo == NULL)
|
|
errx(1, "malloc() failed");
|
|
bzero(trussinfo, sizeof(struct trussinfo));
|
|
trussinfo->outfile = stderr;
|
|
|
|
while ((c = getopt(ac, av, "p:o:faedDS")) != -1) {
|
|
switch (c) {
|
|
case 'p': /* specified pid */
|
|
trussinfo->pid = atoi(optarg);
|
|
break;
|
|
case 'f': /* Follow fork()'s */
|
|
trussinfo->flags |= FOLLOWFORKS;
|
|
break;
|
|
case 'a': /* Print execve() argument strings. */
|
|
trussinfo->flags |= EXECVEARGS;
|
|
break;
|
|
case 'e': /* Print execve() environment strings. */
|
|
trussinfo->flags |= EXECVEENVS;
|
|
break;
|
|
case 'd': /* Absolute timestamps */
|
|
trussinfo->flags |= ABSOLUTETIMESTAMPS;
|
|
break;
|
|
case 'D': /* Relative timestamps */
|
|
trussinfo->flags |= RELATIVETIMESTAMPS;
|
|
break;
|
|
case 'o': /* Specified output file */
|
|
fname = optarg;
|
|
break;
|
|
case 'S': /* Don't trace signals */
|
|
trussinfo->flags |= NOSIGS;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
|
|
ac -= optind; av += optind;
|
|
if ((trussinfo->pid == 0 && ac == 0) || (trussinfo->pid != 0 && ac != 0))
|
|
usage();
|
|
|
|
if (fname != NULL) { /* Use output file */
|
|
if ((trussinfo->outfile = fopen(fname, "w")) == NULL)
|
|
errx(1, "cannot open %s", fname);
|
|
}
|
|
|
|
/*
|
|
* If truss starts the process itself, it will ignore some signals --
|
|
* they should be passed off to the process, which may or may not
|
|
* exit. If, however, we are examining an already-running process,
|
|
* then we restore the event mask on these same signals.
|
|
*/
|
|
|
|
if (trussinfo->pid == 0) { /* Start a command ourselves */
|
|
command = av;
|
|
trussinfo->pid = setup_and_wait(command);
|
|
signal(SIGINT, SIG_IGN);
|
|
signal(SIGTERM, SIG_IGN);
|
|
signal(SIGQUIT, SIG_IGN);
|
|
} else {
|
|
signal(SIGINT, restore_proc);
|
|
signal(SIGTERM, restore_proc);
|
|
signal(SIGQUIT, restore_proc);
|
|
}
|
|
|
|
|
|
/*
|
|
* At this point, if we started the process, it is stopped waiting to
|
|
* be woken up, either in exit() or in execve().
|
|
*/
|
|
|
|
START_TRACE:
|
|
Procfd = start_tracing(
|
|
trussinfo->pid, S_EXEC | S_SCE | S_SCX | S_CORE | S_EXIT |
|
|
((trussinfo->flags & NOSIGS) ? 0 : S_SIG),
|
|
((trussinfo->flags & FOLLOWFORKS) ? PF_FORK : 0));
|
|
if (Procfd == -1)
|
|
return 0;
|
|
|
|
pfs.why = 0;
|
|
|
|
funcs = set_etype(trussinfo);
|
|
/*
|
|
* At this point, it's a simple loop, waiting for the process to
|
|
* stop, finding out why, printing out why, and then continuing it.
|
|
* All of the grunt work is done in the support routines.
|
|
*/
|
|
|
|
clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
|
|
|
|
do {
|
|
int val = 0;
|
|
|
|
if (ioctl(Procfd, PIOCWAIT, &pfs) == -1)
|
|
warn("PIOCWAIT top of loop");
|
|
else {
|
|
switch(i = pfs.why) {
|
|
case S_SCE:
|
|
funcs->enter_syscall(trussinfo, pfs.val);
|
|
clock_gettime(CLOCK_REALTIME, &trussinfo->before);
|
|
break;
|
|
case S_SCX:
|
|
clock_gettime(CLOCK_REALTIME, &trussinfo->after);
|
|
/*
|
|
* This is so we don't get two messages for an exec -- one
|
|
* for the S_EXEC, and one for the syscall exit. It also,
|
|
* conveniently, ensures that the first message printed out
|
|
* isn't the return-from-syscall used to create the process.
|
|
*/
|
|
|
|
if (in_exec) {
|
|
in_exec = 0;
|
|
break;
|
|
}
|
|
|
|
if (trussinfo->in_fork && (trussinfo->flags & FOLLOWFORKS)) {
|
|
int childpid;
|
|
|
|
trussinfo->in_fork = 0;
|
|
childpid = funcs->exit_syscall(trussinfo, pfs.val);
|
|
|
|
/*
|
|
* Fork a new copy of ourself to trace the child of the
|
|
* original traced process.
|
|
*/
|
|
if (fork() == 0) {
|
|
trussinfo->pid = childpid;
|
|
goto START_TRACE;
|
|
}
|
|
break;
|
|
}
|
|
funcs->exit_syscall(trussinfo, pfs.val);
|
|
break;
|
|
case S_SIG:
|
|
signame = strsig(pfs.val);
|
|
fprintf(trussinfo->outfile, "SIGNAL %lu (%s)\n", pfs.val,
|
|
signame == NULL ? "?" : signame);
|
|
free(signame);
|
|
sigexit = pfs.val;
|
|
break;
|
|
case S_EXIT:
|
|
fprintf (trussinfo->outfile, "process exit, rval = %lu\n", pfs.val);
|
|
break;
|
|
case S_EXEC:
|
|
funcs = set_etype(trussinfo);
|
|
in_exec = 1;
|
|
break;
|
|
default:
|
|
fprintf (trussinfo->outfile, "Process stopped because of: %d\n", i);
|
|
break;
|
|
}
|
|
}
|
|
if (ioctl(Procfd, PIOCCONT, val) == -1) {
|
|
if (kill(trussinfo->pid, 0) == -1 && errno == ESRCH)
|
|
break;
|
|
else
|
|
warn("PIOCCONT");
|
|
}
|
|
} while (pfs.why != S_EXIT);
|
|
fflush(trussinfo->outfile);
|
|
if (sigexit) {
|
|
struct rlimit rlp;
|
|
|
|
rlp.rlim_cur = 0;
|
|
rlp.rlim_max = 0;
|
|
setrlimit(RLIMIT_CORE, &rlp);
|
|
(void) signal(sigexit, SIG_DFL);
|
|
(void) kill(getpid(), sigexit);
|
|
}
|
|
return 0;
|
|
}
|