9a55503ec1
additional work is needed to handle ABI-specific syscall argument parsing, but this gets the basic tracing working. MFC after: 1 week
364 lines
9.8 KiB
C
364 lines
9.8 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/sysctl.h>
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#include <ctype.h>
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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 <time.h>
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#include <unistd.h>
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#include "truss.h"
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#include "extern.h"
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#define MAXARGS 6
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static 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 [-faedDS] [-o file] [-s strsize] -p pid",
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" truss [-faedDS] [-o file] [-s strsize] 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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const char *type;
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void (*enter_syscall)(struct trussinfo *, int);
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long (*exit_syscall)(struct trussinfo *, 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 __amd64__
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{ "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit },
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{ "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit },
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{ "Linux ELF32", amd64_linux32_syscall_entry, amd64_linux32_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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{ "FreeBSD ELF32", 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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#ifdef __ia64__
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{ "FreeBSD ELF64", ia64_syscall_entry, ia64_syscall_exit },
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#endif
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#ifdef __powerpc__
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{ "FreeBSD ELF", powerpc_syscall_entry, powerpc_syscall_exit },
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{ "FreeBSD ELF32", powerpc_syscall_entry, powerpc_syscall_exit },
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#endif
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#ifdef __sparc64__
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{ "FreeBSD ELF64", sparc64_syscall_entry, sparc64_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.
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*/
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static struct ex_types *
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set_etype(struct trussinfo *trussinfo)
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{
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struct ex_types *funcs;
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char progt[32];
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size_t len = sizeof(progt);
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int mib[4];
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int error;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_SV_NAME;
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mib[3] = trussinfo->pid;
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error = sysctl(mib, 4, progt, &len, NULL, 0);
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if (error != 0)
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err(2, "can not get etype");
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for (funcs = ex_types; funcs->type; funcs++)
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if (!strcmp(funcs->type, progt))
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break;
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if (funcs->type == NULL) {
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funcs = &ex_types[0];
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warn("execution type %s is not supported -- using %s",
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progt, funcs->type);
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}
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return (funcs);
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}
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char *
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strsig(int sig)
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{
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char *ret;
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ret = NULL;
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if (sig > 0 && sig < NSIG) {
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int i;
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asprintf(&ret, "sig%s", sys_signame[sig]);
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if (ret == NULL)
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return (NULL);
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for (i = 0; ret[i] != '\0'; ++i)
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ret[i] = toupper(ret[i]);
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}
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return (ret);
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}
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int
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main(int ac, char **av)
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{
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int c;
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int i;
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char **command;
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struct ex_types *funcs;
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int initial_open;
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char *fname;
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struct trussinfo *trussinfo;
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char *signame;
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fname = NULL;
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initial_open = 1;
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/* Initialize the trussinfo struct */
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trussinfo = (struct trussinfo *)malloc(sizeof(struct trussinfo));
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if (trussinfo == NULL)
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errx(1, "malloc() failed");
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bzero(trussinfo, sizeof(struct trussinfo));
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trussinfo->outfile = stderr;
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trussinfo->strsize = 32;
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trussinfo->pr_why = S_NONE;
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trussinfo->curthread = NULL;
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SLIST_INIT(&trussinfo->threadlist);
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while ((c = getopt(ac, av, "p:o:faedDs:S")) != -1) {
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switch (c) {
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case 'p': /* specified pid */
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trussinfo->pid = atoi(optarg);
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/* make sure i don't trace me */
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if(trussinfo->pid == getpid()) {
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fprintf(stderr, "attempt to grab self.\n");
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exit(2);
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}
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break;
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case 'f': /* Follow fork()'s */
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trussinfo->flags |= FOLLOWFORKS;
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break;
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case 'a': /* Print execve() argument strings. */
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trussinfo->flags |= EXECVEARGS;
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break;
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case 'e': /* Print execve() environment strings. */
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trussinfo->flags |= EXECVEENVS;
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break;
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case 'd': /* Absolute timestamps */
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trussinfo->flags |= ABSOLUTETIMESTAMPS;
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break;
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case 'D': /* Relative timestamps */
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trussinfo->flags |= RELATIVETIMESTAMPS;
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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': /* Specified string size */
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trussinfo->strsize = atoi(optarg);
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break;
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case 'S': /* Don't trace signals */
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trussinfo->flags |= NOSIGS;
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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 ((trussinfo->pid == 0 && ac == 0) ||
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(trussinfo->pid != 0 && ac != 0))
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usage();
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if (fname != NULL) { /* Use output file */
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if ((trussinfo->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 (trussinfo->pid == 0) { /* Start a command ourselves */
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command = av;
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trussinfo->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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start_tracing(trussinfo->pid);
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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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START_TRACE:
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funcs = set_etype(trussinfo);
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initial_open = 0;
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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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clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
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do {
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struct timespec timediff;
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waitevent(trussinfo);
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switch(i = trussinfo->pr_why) {
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case S_SCE:
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funcs->enter_syscall(trussinfo, MAXARGS);
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clock_gettime(CLOCK_REALTIME,
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&trussinfo->before);
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break;
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case S_SCX:
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clock_gettime(CLOCK_REALTIME,
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&trussinfo->after);
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if (trussinfo->curthread->in_fork &&
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(trussinfo->flags & FOLLOWFORKS)) {
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int childpid;
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trussinfo->curthread->in_fork = 0;
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childpid =
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funcs->exit_syscall(trussinfo,
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trussinfo->pr_data);
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/*
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* Fork a new copy of ourself to trace
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* the child of the original traced
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* process.
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*/
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if (fork() == 0) {
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trussinfo->pid = childpid;
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start_tracing(trussinfo->pid);
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goto START_TRACE;
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}
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break;
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}
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funcs->exit_syscall(trussinfo, MAXARGS);
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break;
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case S_SIG:
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if (trussinfo->flags & NOSIGS)
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break;
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if (trussinfo->flags & FOLLOWFORKS)
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fprintf(trussinfo->outfile, "%5d: ",
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trussinfo->pid);
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if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
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timespecsubt(&trussinfo->after,
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&trussinfo->start_time, &timediff);
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fprintf(trussinfo->outfile, "%ld.%09ld ",
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(long)timediff.tv_sec,
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timediff.tv_nsec);
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}
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if (trussinfo->flags & RELATIVETIMESTAMPS) {
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timespecsubt(&trussinfo->after,
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&trussinfo->before, &timediff);
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fprintf(trussinfo->outfile, "%ld.%09ld ",
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(long)timediff.tv_sec,
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timediff.tv_nsec);
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}
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signame = strsig(trussinfo->pr_data);
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fprintf(trussinfo->outfile,
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"SIGNAL %u (%s)\n", trussinfo->pr_data,
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signame == NULL ? "?" : signame);
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free(signame);
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break;
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case S_EXIT:
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if (trussinfo->flags & FOLLOWFORKS)
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fprintf(trussinfo->outfile, "%5d: ",
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trussinfo->pid);
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if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
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timespecsubt(&trussinfo->after,
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&trussinfo->start_time, &timediff);
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fprintf(trussinfo->outfile, "%ld.%09ld ",
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(long)timediff.tv_sec,
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timediff.tv_nsec);
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}
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if (trussinfo->flags & RELATIVETIMESTAMPS) {
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timespecsubt(&trussinfo->after,
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&trussinfo->before, &timediff);
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fprintf(trussinfo->outfile, "%ld.%09ld ",
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(long)timediff.tv_sec, timediff.tv_nsec);
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}
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fprintf(trussinfo->outfile,
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"process exit, rval = %u\n", trussinfo->pr_data);
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break;
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default:
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break;
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}
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} while (trussinfo->pr_why != S_EXIT);
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fflush(trussinfo->outfile);
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return (0);
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}
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