1191005Sdelphij/*- 2204977Simp * Copyright 1997 Sean Eric Fagan 331899Ssef * 431899Ssef * Redistribution and use in source and binary forms, with or without 531899Ssef * modification, are permitted provided that the following conditions 631899Ssef * are met: 731899Ssef * 1. Redistributions of source code must retain the above copyright 831899Ssef * notice, this list of conditions and the following disclaimer. 931899Ssef * 2. Redistributions in binary form must reproduce the above copyright 1031899Ssef * notice, this list of conditions and the following disclaimer in the 1131899Ssef * documentation and/or other materials provided with the distribution. 1231899Ssef * 3. All advertising materials mentioning features or use of this software 1331899Ssef * must display the following acknowledgement: 1431899Ssef * This product includes software developed by Sean Eric Fagan 1531899Ssef * 4. Neither the name of the author may be used to endorse or promote 1631899Ssef * products derived from this software without specific prior written 1731899Ssef * permission. 1831899Ssef * 1931899Ssef * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2031899Ssef * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2131899Ssef * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2231899Ssef * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2331899Ssef * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2431899Ssef * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2531899Ssef * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2631899Ssef * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2731899Ssef * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2831899Ssef * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2931899Ssef * SUCH DAMAGE. 3031899Ssef */ 3131899Ssef 32119852Scharnier#include <sys/cdefs.h> 33119852Scharnier__FBSDID("$FreeBSD: stable/11/usr.bin/truss/main.c 342708 2019-01-02 20:49:41Z jhb $"); 3432275Scharnier 3531899Ssef/* 36222103Sbcr * The main module for truss. Surprisingly simple, but, then, the other 3731567Ssef * files handle the bulk of the work. And, of course, the kernel has to 3831567Ssef * do a lot of the work :). 3931567Ssef */ 4031567Ssef 41288424Sjhb#include <sys/ptrace.h> 4285301Sdes 4332275Scharnier#include <err.h> 4432275Scharnier#include <signal.h> 45311999Sjhb#include <stdbool.h> 4631567Ssef#include <stdio.h> 4731567Ssef#include <stdlib.h> 48294849Sjhb#include <sysdecode.h> 49101423Smdodd#include <time.h> 5031579Speter#include <unistd.h> 5131567Ssef 52101282Smdodd#include "truss.h" 5387703Smarkm#include "extern.h" 54192025Sdds#include "syscall.h" 5531567Ssef 56144177Salfredstatic void 5732275Scharnierusage(void) 5832275Scharnier{ 59144177Salfred fprintf(stderr, "%s\n%s\n", 60324777Semaste "usage: truss [-cfaedDHS] [-o file] [-s strsize] -p pid", 61324777Semaste " truss [-cfaedDHS] [-o file] [-s strsize] command [args]"); 62144177Salfred exit(1); 6331567Ssef} 6431567Ssef 6532275Scharnierint 66144177Salfredmain(int ac, char **av) 67144177Salfred{ 68240393Szont struct sigaction sa; 69240005Szont struct trussinfo *trussinfo; 70144178Salfred char *fname; 71240005Szont char **command; 72342708Sjhb const char *errstr; 73288424Sjhb pid_t pid; 74288424Sjhb int c; 7531567Ssef 76144178Salfred fname = NULL; 77144178Salfred 78144177Salfred /* Initialize the trussinfo struct */ 79192153Sdelphij trussinfo = (struct trussinfo *)calloc(1, sizeof(struct trussinfo)); 80144177Salfred if (trussinfo == NULL) 81192153Sdelphij errx(1, "calloc() failed"); 82192153Sdelphij 83288424Sjhb pid = 0; 84144177Salfred trussinfo->outfile = stderr; 85153963Sbrian trussinfo->strsize = 32; 86168569Sdelphij trussinfo->curthread = NULL; 87288424Sjhb LIST_INIT(&trussinfo->proclist); 88288832Sbdrewery init_syscalls(); 89295930Sjhb while ((c = getopt(ac, av, "p:o:facedDs:SH")) != -1) { 90144177Salfred switch (c) { 91144177Salfred case 'p': /* specified pid */ 92288424Sjhb pid = atoi(optarg); 93171055Sdelphij /* make sure i don't trace me */ 94288424Sjhb if (pid == getpid()) { 95288424Sjhb errx(2, "attempt to grab self."); 96171055Sdelphij } 97144177Salfred break; 98144177Salfred case 'f': /* Follow fork()'s */ 99144177Salfred trussinfo->flags |= FOLLOWFORKS; 100144177Salfred break; 101144177Salfred case 'a': /* Print execve() argument strings. */ 102144177Salfred trussinfo->flags |= EXECVEARGS; 103144177Salfred break; 104192025Sdds case 'c': /* Count number of system calls and time. */ 105289080Sbdrewery trussinfo->flags |= (COUNTONLY | NOSIGS); 106192025Sdds break; 107144177Salfred case 'e': /* Print execve() environment strings. */ 108144177Salfred trussinfo->flags |= EXECVEENVS; 109144177Salfred break; 110144177Salfred case 'd': /* Absolute timestamps */ 111144177Salfred trussinfo->flags |= ABSOLUTETIMESTAMPS; 112144177Salfred break; 113144177Salfred case 'D': /* Relative timestamps */ 114144177Salfred trussinfo->flags |= RELATIVETIMESTAMPS; 115144177Salfred break; 116144177Salfred case 'o': /* Specified output file */ 117144177Salfred fname = optarg; 118144177Salfred break; 119153963Sbrian case 's': /* Specified string size */ 120342708Sjhb trussinfo->strsize = strtonum(optarg, 0, INT_MAX, &errstr); 121342708Sjhb if (errstr) 122342708Sjhb errx(1, "maximum string size is %s: %s", errstr, optarg); 123153963Sbrian break; 124240005Szont case 'S': /* Don't trace signals */ 125144177Salfred trussinfo->flags |= NOSIGS; 126144177Salfred break; 127295930Sjhb case 'H': 128295930Sjhb trussinfo->flags |= DISPLAYTIDS; 129295930Sjhb break; 130144177Salfred default: 131144177Salfred usage(); 132144177Salfred } 133144177Salfred } 13431567Ssef 135144177Salfred ac -= optind; av += optind; 136288424Sjhb if ((pid == 0 && ac == 0) || 137288424Sjhb (pid != 0 && ac != 0)) 138144177Salfred usage(); 13931567Ssef 140144177Salfred if (fname != NULL) { /* Use output file */ 141215235Sjh /* 142245957Smjg * Set close-on-exec ('e'), so that the output file is not 143245957Smjg * shared with the traced process. 144215235Sjh */ 145245957Smjg if ((trussinfo->outfile = fopen(fname, "we")) == NULL) 146245957Smjg err(1, "cannot open %s", fname); 147144177Salfred } 14832275Scharnier 149144177Salfred /* 150144177Salfred * If truss starts the process itself, it will ignore some signals -- 151144177Salfred * they should be passed off to the process, which may or may not 152144177Salfred * exit. If, however, we are examining an already-running process, 153144177Salfred * then we restore the event mask on these same signals. 154144177Salfred */ 155288424Sjhb if (pid == 0) { 156288424Sjhb /* Start a command ourselves */ 157144177Salfred command = av; 158288424Sjhb setup_and_wait(trussinfo, command); 159144177Salfred signal(SIGINT, SIG_IGN); 160144177Salfred signal(SIGTERM, SIG_IGN); 161144177Salfred signal(SIGQUIT, SIG_IGN); 162144177Salfred } else { 163240393Szont sa.sa_handler = restore_proc; 164240393Szont sa.sa_flags = 0; 165240393Szont sigemptyset(&sa.sa_mask); 166240393Szont sigaction(SIGINT, &sa, NULL); 167240393Szont sigaction(SIGQUIT, &sa, NULL); 168240393Szont sigaction(SIGTERM, &sa, NULL); 169288424Sjhb start_tracing(trussinfo, pid); 170144177Salfred } 17131567Ssef 172144177Salfred /* 173144177Salfred * At this point, if we started the process, it is stopped waiting to 174144177Salfred * be woken up, either in exit() or in execve(). 175144177Salfred */ 176288424Sjhb if (LIST_FIRST(&trussinfo->proclist)->abi == NULL) { 177288424Sjhb /* 178288424Sjhb * If we are not able to handle this ABI, detach from the 179288424Sjhb * process and exit. If we just created a new process to 180288424Sjhb * run a command, kill the new process rather than letting 181288424Sjhb * it run untraced. 182288424Sjhb */ 183288424Sjhb if (pid == 0) 184288424Sjhb kill(LIST_FIRST(&trussinfo->proclist)->pid, SIGKILL); 185288424Sjhb ptrace(PT_DETACH, LIST_FIRST(&trussinfo->proclist)->pid, NULL, 186288424Sjhb 0); 187288424Sjhb return (1); 188288424Sjhb } 189288424Sjhb ptrace(PT_SYSCALL, LIST_FIRST(&trussinfo->proclist)->pid, (caddr_t)1, 190288424Sjhb 0); 19131567Ssef 192144177Salfred /* 193144177Salfred * At this point, it's a simple loop, waiting for the process to 194144177Salfred * stop, finding out why, printing out why, and then continuing it. 195144177Salfred * All of the grunt work is done in the support routines. 196144177Salfred */ 197144177Salfred clock_gettime(CLOCK_REALTIME, &trussinfo->start_time); 198101285Smdodd 199288424Sjhb eventloop(trussinfo); 20031567Ssef 201240005Szont if (trussinfo->flags & COUNTONLY) 202240005Szont print_summary(trussinfo); 203192025Sdds 204192025Sdds fflush(trussinfo->outfile); 205192025Sdds 206144177Salfred return (0); 20731567Ssef} 208