main.c revision 179051
131567Ssef/* 231899Ssef * Copryight 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: head/usr.bin/truss/main.c 179051 2008-05-16 15:34:06Z jhb $"); 3432275Scharnier 3531899Ssef/* 3631567Ssef * The main module for truss. Suprisingly 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 4185301Sdes#include <sys/param.h> 42123916Scracauer#include <sys/types.h> 43104581Smike#include <sys/time.h> 44123916Scracauer#include <sys/resource.h> 45168569Sdelphij#include <sys/sysctl.h> 4685301Sdes 47132306Salfred#include <ctype.h> 4832275Scharnier#include <err.h> 4932275Scharnier#include <errno.h> 5032275Scharnier#include <fcntl.h> 5132275Scharnier#include <signal.h> 5231567Ssef#include <stdio.h> 5331567Ssef#include <stdlib.h> 5431567Ssef#include <string.h> 55101423Smdodd#include <time.h> 5631579Speter#include <unistd.h> 5731567Ssef 58101282Smdodd#include "truss.h" 5987703Smarkm#include "extern.h" 6031567Ssef 61171645Smarcel#define MAXARGS 6 6231567Ssef 63144177Salfredstatic void 6432275Scharnierusage(void) 6532275Scharnier{ 66144177Salfred fprintf(stderr, "%s\n%s\n", 67153963Sbrian "usage: truss [-faedDS] [-o file] [-s strsize] -p pid", 68153963Sbrian " truss [-faedDS] [-o file] [-s strsize] command [args]"); 69144177Salfred exit(1); 7031567Ssef} 7131567Ssef 7238897Ssef/* 7338897Ssef * WARNING! "FreeBSD a.out" must be first, or set_etype will not 7438897Ssef * work correctly. 7538897Ssef */ 7631567Ssefstruct ex_types { 77144177Salfred const char *type; 78144177Salfred void (*enter_syscall)(struct trussinfo *, int); 79144177Salfred long (*exit_syscall)(struct trussinfo *, int); 8031567Ssef} ex_types[] = { 8139908Ssef#ifdef __alpha__ 82144177Salfred { "FreeBSD ELF", alpha_syscall_entry, alpha_syscall_exit }, 8339908Ssef#endif 84130394Sdwmalone#ifdef __amd64__ 85144177Salfred { "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit }, 86179051Sjhb { "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit }, 87179051Sjhb { "Linux ELF32", amd64_linux32_syscall_entry, amd64_linux32_syscall_exit }, 88130394Sdwmalone#endif 8939908Ssef#ifdef __i386__ 90144177Salfred { "FreeBSD a.out", i386_syscall_entry, i386_syscall_exit }, 91144177Salfred { "FreeBSD ELF", i386_syscall_entry, i386_syscall_exit }, 92144177Salfred { "FreeBSD ELF32", i386_syscall_entry, i386_syscall_exit }, 93144177Salfred { "Linux ELF", i386_linux_syscall_entry, i386_linux_syscall_exit }, 9439908Ssef#endif 95106716Smarcel#ifdef __ia64__ 96144177Salfred { "FreeBSD ELF64", ia64_syscall_entry, ia64_syscall_exit }, 97106716Smarcel#endif 98154047Sgrehan#ifdef __powerpc__ 99154047Sgrehan { "FreeBSD ELF", powerpc_syscall_entry, powerpc_syscall_exit }, 100154047Sgrehan { "FreeBSD ELF32", powerpc_syscall_entry, powerpc_syscall_exit }, 101154047Sgrehan#endif 102101320Sjake#ifdef __sparc64__ 103144177Salfred { "FreeBSD ELF64", sparc64_syscall_entry, sparc64_syscall_exit }, 104101320Sjake#endif 105144177Salfred { 0, 0, 0 }, 10631567Ssef}; 10731567Ssef 10831567Ssef/* 10931567Ssef * Set the execution type. This is called after every exec, and when 110168569Sdelphij * a process is first monitored. 11131567Ssef */ 11231567Ssef 11331567Ssefstatic struct ex_types * 114144177Salfredset_etype(struct trussinfo *trussinfo) 115144177Salfred{ 116144177Salfred struct ex_types *funcs; 117144177Salfred char progt[32]; 118168569Sdelphij 119168569Sdelphij size_t len = sizeof(progt); 120168569Sdelphij int mib[4]; 121168569Sdelphij int error; 12231567Ssef 123168569Sdelphij mib[0] = CTL_KERN; 124168569Sdelphij mib[1] = KERN_PROC; 125168569Sdelphij mib[2] = KERN_PROC_SV_NAME; 126168569Sdelphij mib[3] = trussinfo->pid; 127168569Sdelphij error = sysctl(mib, 4, progt, &len, NULL, 0); 128168569Sdelphij if (error != 0) 129168569Sdelphij err(2, "can not get etype"); 13031567Ssef 131144177Salfred for (funcs = ex_types; funcs->type; funcs++) 132144177Salfred if (!strcmp(funcs->type, progt)) 133144177Salfred break; 13431567Ssef 135144177Salfred if (funcs->type == NULL) { 136144177Salfred funcs = &ex_types[0]; 137144177Salfred warn("execution type %s is not supported -- using %s", 138144177Salfred progt, funcs->type); 139144177Salfred } 140144177Salfred return (funcs); 14131567Ssef} 14231567Ssef 143132306Salfredchar * 144132306Salfredstrsig(int sig) 145132306Salfred{ 146132306Salfred char *ret; 147132306Salfred 148132306Salfred ret = NULL; 149132306Salfred if (sig > 0 && sig < NSIG) { 150132306Salfred int i; 151132306Salfred asprintf(&ret, "sig%s", sys_signame[sig]); 152132306Salfred if (ret == NULL) 153132306Salfred return (NULL); 154132306Salfred for (i = 0; ret[i] != '\0'; ++i) 155132306Salfred ret[i] = toupper(ret[i]); 156132306Salfred } 157132306Salfred return (ret); 158132306Salfred} 159132306Salfred 16032275Scharnierint 161144177Salfredmain(int ac, char **av) 162144177Salfred{ 163144177Salfred int c; 164144177Salfred int i; 165144177Salfred char **command; 166144177Salfred struct ex_types *funcs; 167171055Sdelphij int initial_open; 168144178Salfred char *fname; 169144177Salfred struct trussinfo *trussinfo; 170144177Salfred char *signame; 17131567Ssef 172144178Salfred fname = NULL; 173144178Salfred initial_open = 1; 174144178Salfred 175144177Salfred /* Initialize the trussinfo struct */ 176144177Salfred trussinfo = (struct trussinfo *)malloc(sizeof(struct trussinfo)); 177144177Salfred if (trussinfo == NULL) 178144177Salfred errx(1, "malloc() failed"); 179144177Salfred bzero(trussinfo, sizeof(struct trussinfo)); 180168569Sdelphij 181144177Salfred trussinfo->outfile = stderr; 182153963Sbrian trussinfo->strsize = 32; 183168569Sdelphij trussinfo->pr_why = S_NONE; 184168569Sdelphij trussinfo->curthread = NULL; 185168569Sdelphij SLIST_INIT(&trussinfo->threadlist); 186153963Sbrian while ((c = getopt(ac, av, "p:o:faedDs:S")) != -1) { 187144177Salfred switch (c) { 188144177Salfred case 'p': /* specified pid */ 189144177Salfred trussinfo->pid = atoi(optarg); 190171055Sdelphij /* make sure i don't trace me */ 191171055Sdelphij if(trussinfo->pid == getpid()) { 192171055Sdelphij fprintf(stderr, "attempt to grab self.\n"); 193171055Sdelphij exit(2); 194171055Sdelphij } 195144177Salfred break; 196144177Salfred case 'f': /* Follow fork()'s */ 197144177Salfred trussinfo->flags |= FOLLOWFORKS; 198144177Salfred break; 199144177Salfred case 'a': /* Print execve() argument strings. */ 200144177Salfred trussinfo->flags |= EXECVEARGS; 201144177Salfred break; 202144177Salfred case 'e': /* Print execve() environment strings. */ 203144177Salfred trussinfo->flags |= EXECVEENVS; 204144177Salfred break; 205144177Salfred case 'd': /* Absolute timestamps */ 206144177Salfred trussinfo->flags |= ABSOLUTETIMESTAMPS; 207144177Salfred break; 208144177Salfred case 'D': /* Relative timestamps */ 209144177Salfred trussinfo->flags |= RELATIVETIMESTAMPS; 210144177Salfred break; 211144177Salfred case 'o': /* Specified output file */ 212144177Salfred fname = optarg; 213144177Salfred break; 214153963Sbrian case 's': /* Specified string size */ 215153963Sbrian trussinfo->strsize = atoi(optarg); 216153963Sbrian break; 217144177Salfred case 'S': /* Don't trace signals */ 218144177Salfred trussinfo->flags |= NOSIGS; 219144177Salfred break; 220144177Salfred default: 221144177Salfred usage(); 222144177Salfred } 223144177Salfred } 22431567Ssef 225144177Salfred ac -= optind; av += optind; 226144177Salfred if ((trussinfo->pid == 0 && ac == 0) || 227144177Salfred (trussinfo->pid != 0 && ac != 0)) 228144177Salfred usage(); 22931567Ssef 230144177Salfred if (fname != NULL) { /* Use output file */ 231144177Salfred if ((trussinfo->outfile = fopen(fname, "w")) == NULL) 232144177Salfred errx(1, "cannot open %s", fname); 233144177Salfred } 23432275Scharnier 235144177Salfred /* 236144177Salfred * If truss starts the process itself, it will ignore some signals -- 237144177Salfred * they should be passed off to the process, which may or may not 238144177Salfred * exit. If, however, we are examining an already-running process, 239144177Salfred * then we restore the event mask on these same signals. 240144177Salfred */ 24131567Ssef 242144177Salfred if (trussinfo->pid == 0) { /* Start a command ourselves */ 243144177Salfred command = av; 244144177Salfred trussinfo->pid = setup_and_wait(command); 245144177Salfred signal(SIGINT, SIG_IGN); 246144177Salfred signal(SIGTERM, SIG_IGN); 247144177Salfred signal(SIGQUIT, SIG_IGN); 248144177Salfred } else { 249168569Sdelphij start_tracing(trussinfo->pid); 250144177Salfred signal(SIGINT, restore_proc); 251144177Salfred signal(SIGTERM, restore_proc); 252144177Salfred signal(SIGQUIT, restore_proc); 253144177Salfred } 25431567Ssef 25531567Ssef 256144177Salfred /* 257144177Salfred * At this point, if we started the process, it is stopped waiting to 258144177Salfred * be woken up, either in exit() or in execve(). 259144177Salfred */ 26031567Ssef 261101283SmdoddSTART_TRACE: 262168569Sdelphij funcs = set_etype(trussinfo); 263168569Sdelphij 264144178Salfred initial_open = 0; 265144177Salfred /* 266144177Salfred * At this point, it's a simple loop, waiting for the process to 267144177Salfred * stop, finding out why, printing out why, and then continuing it. 268144177Salfred * All of the grunt work is done in the support routines. 269144177Salfred */ 27031567Ssef 271144177Salfred clock_gettime(CLOCK_REALTIME, &trussinfo->start_time); 272101285Smdodd 273144177Salfred do { 274158630Spav struct timespec timediff; 275168569Sdelphij waitevent(trussinfo); 27631567Ssef 277168569Sdelphij switch(i = trussinfo->pr_why) { 278168569Sdelphij case S_SCE: 279168569Sdelphij funcs->enter_syscall(trussinfo, MAXARGS); 280168569Sdelphij clock_gettime(CLOCK_REALTIME, 281168569Sdelphij &trussinfo->before); 282168569Sdelphij break; 283168569Sdelphij case S_SCX: 284168569Sdelphij clock_gettime(CLOCK_REALTIME, 285168569Sdelphij &trussinfo->after); 28631567Ssef 287168569Sdelphij if (trussinfo->curthread->in_fork && 288168569Sdelphij (trussinfo->flags & FOLLOWFORKS)) { 289168569Sdelphij int childpid; 290101283Smdodd 291168569Sdelphij trussinfo->curthread->in_fork = 0; 292168569Sdelphij childpid = 293168569Sdelphij funcs->exit_syscall(trussinfo, 294168569Sdelphij trussinfo->pr_data); 295101283Smdodd 296168569Sdelphij /* 297168569Sdelphij * Fork a new copy of ourself to trace 298168569Sdelphij * the child of the original traced 299168569Sdelphij * process. 300168569Sdelphij */ 301168569Sdelphij if (fork() == 0) { 302168569Sdelphij trussinfo->pid = childpid; 303168569Sdelphij start_tracing(trussinfo->pid); 304168569Sdelphij goto START_TRACE; 305144177Salfred } 306144177Salfred break; 307168569Sdelphij } 308168569Sdelphij funcs->exit_syscall(trussinfo, MAXARGS); 309168569Sdelphij break; 310168569Sdelphij case S_SIG: 311168569Sdelphij if (trussinfo->flags & NOSIGS) 312144177Salfred break; 313168569Sdelphij if (trussinfo->flags & FOLLOWFORKS) 314168569Sdelphij fprintf(trussinfo->outfile, "%5d: ", 315168569Sdelphij trussinfo->pid); 316168569Sdelphij if (trussinfo->flags & ABSOLUTETIMESTAMPS) { 317168569Sdelphij timespecsubt(&trussinfo->after, 318168569Sdelphij &trussinfo->start_time, &timediff); 319168569Sdelphij fprintf(trussinfo->outfile, "%ld.%09ld ", 320168569Sdelphij (long)timediff.tv_sec, 321168569Sdelphij timediff.tv_nsec); 322144177Salfred } 323168569Sdelphij if (trussinfo->flags & RELATIVETIMESTAMPS) { 324168569Sdelphij timespecsubt(&trussinfo->after, 325168569Sdelphij &trussinfo->before, &timediff); 326168569Sdelphij fprintf(trussinfo->outfile, "%ld.%09ld ", 327168569Sdelphij (long)timediff.tv_sec, 328168569Sdelphij timediff.tv_nsec); 329168569Sdelphij } 330168569Sdelphij signame = strsig(trussinfo->pr_data); 331168569Sdelphij fprintf(trussinfo->outfile, 332168569Sdelphij "SIGNAL %u (%s)\n", trussinfo->pr_data, 333168569Sdelphij signame == NULL ? "?" : signame); 334168569Sdelphij free(signame); 335168569Sdelphij break; 336168569Sdelphij case S_EXIT: 337168569Sdelphij if (trussinfo->flags & FOLLOWFORKS) 338168569Sdelphij fprintf(trussinfo->outfile, "%5d: ", 339168569Sdelphij trussinfo->pid); 340168569Sdelphij if (trussinfo->flags & ABSOLUTETIMESTAMPS) { 341168569Sdelphij timespecsubt(&trussinfo->after, 342168569Sdelphij &trussinfo->start_time, &timediff); 343168569Sdelphij fprintf(trussinfo->outfile, "%ld.%09ld ", 344168569Sdelphij (long)timediff.tv_sec, 345168569Sdelphij timediff.tv_nsec); 346168569Sdelphij } 347168569Sdelphij if (trussinfo->flags & RELATIVETIMESTAMPS) { 348168569Sdelphij timespecsubt(&trussinfo->after, 349168569Sdelphij &trussinfo->before, &timediff); 350168569Sdelphij fprintf(trussinfo->outfile, "%ld.%09ld ", 351168569Sdelphij (long)timediff.tv_sec, timediff.tv_nsec); 352168569Sdelphij } 353168569Sdelphij fprintf(trussinfo->outfile, 354168569Sdelphij "process exit, rval = %u\n", trussinfo->pr_data); 355168569Sdelphij break; 356168569Sdelphij default: 357168569Sdelphij break; 358144177Salfred } 359168569Sdelphij } while (trussinfo->pr_why != S_EXIT); 360144177Salfred fflush(trussinfo->outfile); 361168569Sdelphij 362144177Salfred return (0); 36331567Ssef} 364