/* * 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 __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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "truss.h" #include "extern.h" #define MAXARGS 6 static void usage(void) { fprintf(stderr, "%s\n%s\n", "usage: truss [-faedDS] [-o file] [-s strsize] -p pid", " truss [-faedDS] [-o file] [-s strsize] 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 __amd64__ { "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit }, { "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit }, { "Linux ELF32", amd64_linux32_syscall_entry, amd64_linux32_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 __powerpc__ { "FreeBSD ELF", powerpc_syscall_entry, powerpc_syscall_exit }, { "FreeBSD ELF32", powerpc_syscall_entry, powerpc_syscall_exit }, #endif #ifdef __sparc64__ { "FreeBSD ELF64", sparc64_syscall_entry, sparc64_syscall_exit }, #endif #ifdef __mips__ { "FreeBSD ELF", mips_syscall_entry, mips_syscall_exit }, { "FreeBSD ELF32", mips_syscall_entry, mips_syscall_exit }, { "FreeBSD ELF64", mips_syscall_entry, mips_syscall_exit }, // XXX #endif { 0, 0, 0 }, }; /* * Set the execution type. This is called after every exec, and when * a process is first monitored. */ static struct ex_types * set_etype(struct trussinfo *trussinfo) { struct ex_types *funcs; char progt[32]; size_t len = sizeof(progt); int mib[4]; int error; mib[0] = CTL_KERN; mib[1] = KERN_PROC; mib[2] = KERN_PROC_SV_NAME; mib[3] = trussinfo->pid; error = sysctl(mib, 4, progt, &len, NULL, 0); if (error != 0) err(2, "can not get etype"); 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 ex_types *funcs; int initial_open; char *fname; struct trussinfo *trussinfo; char *signame; fname = NULL; initial_open = 1; /* 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; trussinfo->strsize = 32; trussinfo->pr_why = S_NONE; trussinfo->curthread = NULL; SLIST_INIT(&trussinfo->threadlist); while ((c = getopt(ac, av, "p:o:faedDs:S")) != -1) { switch (c) { case 'p': /* specified pid */ trussinfo->pid = atoi(optarg); /* make sure i don't trace me */ if(trussinfo->pid == getpid()) { fprintf(stderr, "attempt to grab self.\n"); exit(2); } 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': /* Specified string size */ trussinfo->strsize = atoi(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 { start_tracing(trussinfo->pid); 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: funcs = set_etype(trussinfo); initial_open = 0; /* * 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 { struct timespec timediff; waitevent(trussinfo); switch(i = trussinfo->pr_why) { case S_SCE: funcs->enter_syscall(trussinfo, MAXARGS); clock_gettime(CLOCK_REALTIME, &trussinfo->before); break; case S_SCX: clock_gettime(CLOCK_REALTIME, &trussinfo->after); if (trussinfo->curthread->in_fork && (trussinfo->flags & FOLLOWFORKS)) { int childpid; trussinfo->curthread->in_fork = 0; childpid = funcs->exit_syscall(trussinfo, trussinfo->pr_data); /* * Fork a new copy of ourself to trace * the child of the original traced * process. */ if (fork() == 0) { trussinfo->pid = childpid; start_tracing(trussinfo->pid); goto START_TRACE; } break; } funcs->exit_syscall(trussinfo, MAXARGS); break; case S_SIG: if (trussinfo->flags & NOSIGS) break; if (trussinfo->flags & FOLLOWFORKS) fprintf(trussinfo->outfile, "%5d: ", trussinfo->pid); if (trussinfo->flags & ABSOLUTETIMESTAMPS) { timespecsubt(&trussinfo->after, &trussinfo->start_time, &timediff); fprintf(trussinfo->outfile, "%ld.%09ld ", (long)timediff.tv_sec, timediff.tv_nsec); } if (trussinfo->flags & RELATIVETIMESTAMPS) { timespecsubt(&trussinfo->after, &trussinfo->before, &timediff); fprintf(trussinfo->outfile, "%ld.%09ld ", (long)timediff.tv_sec, timediff.tv_nsec); } signame = strsig(trussinfo->pr_data); fprintf(trussinfo->outfile, "SIGNAL %u (%s)\n", trussinfo->pr_data, signame == NULL ? "?" : signame); free(signame); break; case S_EXIT: if (trussinfo->flags & FOLLOWFORKS) fprintf(trussinfo->outfile, "%5d: ", trussinfo->pid); if (trussinfo->flags & ABSOLUTETIMESTAMPS) { timespecsubt(&trussinfo->after, &trussinfo->start_time, &timediff); fprintf(trussinfo->outfile, "%ld.%09ld ", (long)timediff.tv_sec, timediff.tv_nsec); } if (trussinfo->flags & RELATIVETIMESTAMPS) { timespecsubt(&trussinfo->after, &trussinfo->before, &timediff); fprintf(trussinfo->outfile, "%ld.%09ld ", (long)timediff.tv_sec, timediff.tv_nsec); } fprintf(trussinfo->outfile, "process exit, rval = %u\n", trussinfo->pr_data); break; default: break; } } while (trussinfo->pr_why != S_EXIT); fflush(trussinfo->outfile); return (0); }