265 lines
7.2 KiB
C
265 lines
7.2 KiB
C
/*
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* Copryight 1997 Sean Eric Fagan
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Sean Eric Fagan
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* 4. Neither the name of the author may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$Id: main.c,v 1.11 1998/09/07 05:49:43 sef Exp $";
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#endif /* not lint */
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/*
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* The main module for truss. Suprisingly simple, but, then, the other
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* files handle the bulk of the work. And, of course, the kernel has to
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* do a lot of the work :).
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/pioctl.h>
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extern int setup_and_wait(char **);
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extern int start_tracing(int, int);
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#ifdef __alpha__
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extern void alpha_syscall_entry(int, int);
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extern void alpha_syscall_exit(int, int);
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#endif
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#ifdef __i386__
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extern void i386_syscall_entry(int, int);
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extern void i386_syscall_exit(int, int);
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extern void i386_linux_syscall_entry(int, int);
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extern void i386_linux_syscall_exit(int, int);
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#endif
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/*
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* These should really be parameterized -- I don't like having globals,
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* but this is the easiest way, right now, to deal with them.
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*/
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int pid = 0;
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int nosigs = 0;
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FILE *outfile = stderr;
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int Procfd;
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char progtype[50]; /* OS and type of executable */
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static inline void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n",
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"usage: truss [-S] [-o file] -p pid",
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" truss [-S] [-o file] command [args]");
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exit(1);
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}
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/*
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* WARNING! "FreeBSD a.out" must be first, or set_etype will not
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* work correctly.
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*/
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struct ex_types {
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char *type;
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void (*enter_syscall)(int, int);
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void (*exit_syscall)(int, int);
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} ex_types[] = {
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#ifdef __alpha__
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{ "FreeBSD ELF", alpha_syscall_entry, alpha_syscall_exit },
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#endif
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#ifdef __i386__
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{ "FreeBSD a.out", i386_syscall_entry, i386_syscall_exit },
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{ "FreeBSD ELF", i386_syscall_entry, i386_syscall_exit },
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{ "Linux ELF", i386_linux_syscall_entry, i386_linux_syscall_exit },
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#endif
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{ 0, 0, 0 },
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};
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/*
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* Set the execution type. This is called after every exec, and when
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* a process is first monitored. The procfs pseudo-file "etype" has
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* the execution module type -- see /proc/curproc/etype for an example.
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*/
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static struct ex_types *
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set_etype() {
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struct ex_types *funcs;
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char etype[24];
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char progtype[32];
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int fd;
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sprintf(etype, "/proc/%d/etype", pid);
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if ((fd = open(etype, O_RDONLY)) == -1) {
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strcpy(progtype, "FreeBSD a.out");
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} else {
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int len = read(fd, progtype, sizeof(progtype));
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progtype[len-1] = '\0';
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close(fd);
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}
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for (funcs = ex_types; funcs->type; funcs++)
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if (!strcmp(funcs->type, progtype))
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break;
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if (funcs == NULL) {
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warn("Execution type %s is not supported -- using FreeBSD a.out\n",
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progtype);
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funcs = &ex_types[0];
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}
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return funcs;
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}
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int
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main(int ac, char **av) {
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int c;
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int i;
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char **command;
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struct procfs_status pfs;
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struct ex_types *funcs;
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int in_exec = 0;
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char *fname = NULL;
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int sigexit = 0;
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while ((c = getopt(ac, av, "p:o:S")) != -1) {
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switch (c) {
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case 'p': /* specified pid */
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pid = atoi(optarg);
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break;
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case 'o': /* Specified output file */
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fname = optarg;
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break;
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case 'S': /* Don't trace signals */
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nosigs = 1;
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break;
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default:
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usage();
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}
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}
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ac -= optind; av += optind;
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if ((pid == 0 && ac == 0) || (pid != 0 && ac != 0))
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usage();
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if (fname != NULL) { /* Use output file */
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if ((outfile = fopen(fname, "w")) == NULL)
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errx(1, "cannot open %s", fname);
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}
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/*
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* If truss starts the process itself, it will ignore some signals --
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* they should be passed off to the process, which may or may not
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* exit. If, however, we are examining an already-running process,
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* then we restore the event mask on these same signals.
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*/
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if (pid == 0) { /* Start a command ourselves */
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command = av;
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pid = setup_and_wait(command);
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signal(SIGINT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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} else {
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extern void restore_proc(int);
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signal(SIGINT, restore_proc);
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signal(SIGTERM, restore_proc);
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signal(SIGQUIT, restore_proc);
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}
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/*
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* At this point, if we started the process, it is stopped waiting to
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* be woken up, either in exit() or in execve().
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*/
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Procfd = start_tracing(pid, S_EXEC | S_SCE | S_SCX | S_CORE | S_EXIT |
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(nosigs ? 0 : S_SIG));
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pfs.why = 0;
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funcs = set_etype();
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/*
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* At this point, it's a simple loop, waiting for the process to
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* stop, finding out why, printing out why, and then continuing it.
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* All of the grunt work is done in the support routines.
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*/
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do {
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int val = 0;
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if (ioctl(Procfd, PIOCWAIT, &pfs) == -1)
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warn("PIOCWAIT top of loop");
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else {
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switch(i = pfs.why) {
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case S_SCE:
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funcs->enter_syscall(pid, pfs.val);
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break;
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case S_SCX:
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/*
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* This is so we don't get two messages for an exec -- one
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* for the S_EXEC, and one for the syscall exit. It also,
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* conveniently, ensures that the first message printed out
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* isn't the return-from-syscall used to create the process.
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*/
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if (in_exec) {
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in_exec = 0;
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break;
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}
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funcs->exit_syscall(pid, pfs.val);
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break;
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case S_SIG:
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fprintf(outfile, "SIGNAL %lu\n", pfs.val);
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sigexit = pfs.val;
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break;
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case S_EXIT:
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fprintf (outfile, "process exit, rval = %lu\n", pfs.val);
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break;
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case S_EXEC:
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funcs = set_etype();
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in_exec = 1;
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break;
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default:
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fprintf (outfile, "Process stopped because of: %d\n", i);
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break;
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}
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}
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if (ioctl(Procfd, PIOCCONT, val) == -1)
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warn("PIOCCONT");
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} while (pfs.why != S_EXIT);
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if (sigexit) {
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if (sigexit == SIGQUIT)
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exit(sigexit);
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(void) signal(sigexit, SIG_DFL);
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(void) kill(getpid(), sigexit);
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}
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return 0;
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}
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