1 /* $OpenBSD: kvm_proc2.c,v 1.26 2015/09/08 15:40:32 dlg Exp $ */ 2 /* $NetBSD: kvm_proc.c,v 1.30 1999/03/24 05:50:50 mrg Exp $ */ 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved. 33 * Copyright (c) 1989, 1992, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software developed by the Computer Systems 37 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 38 * BG 91-66 and contributed to Berkeley. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 /* 66 * Proc traversal interface for kvm. ps and w are (probably) the exclusive 67 * users of this code, so we've factored it out into a separate module. 68 * Thus, we keep this grunge out of the other kvm applications (i.e., 69 * most other applications are interested only in open/close/read/nlist). 70 */ 71 72 #define __need_process 73 #include <sys/param.h> 74 #include <sys/proc.h> 75 #include <sys/exec.h> 76 #include <sys/stat.h> 77 #include <sys/ucred.h> 78 #include <sys/ioctl.h> 79 #include <sys/tty.h> 80 #include <sys/resource.h> 81 #include <sys/resourcevar.h> 82 #include <sys/signalvar.h> 83 #include <stddef.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <unistd.h> 87 #include <nlist.h> 88 #include <kvm.h> 89 90 #include <uvm/uvm_extern.h> 91 #include <uvm/uvm_amap.h> 92 #include <machine/vmparam.h> 93 #include <machine/pmap.h> 94 95 #include <sys/sysctl.h> 96 97 #include <limits.h> 98 #include <errno.h> 99 #include <db.h> 100 #include <paths.h> 101 102 #include "kvm_private.h" 103 104 /* 105 * Read proc's from memory file into buffer bp, which has space to hold 106 * at most maxcnt procs. 107 */ 108 static int 109 kvm_proclist(kvm_t *kd, int op, int arg, struct process *pr, 110 char *bp, int maxcnt, size_t esize) 111 { 112 struct kinfo_proc kp; 113 struct session sess; 114 struct ucred ucred; 115 struct proc proc, proc2, *p; 116 struct process process, process2; 117 struct pgrp pgrp; 118 struct tty tty; 119 struct sigacts sa, *sap; 120 struct vmspace vm, *vmp; 121 struct plimit limits, *limp; 122 pid_t process_pid, parent_pid, leader_pid; 123 int cnt = 0; 124 int dothreads = 0; 125 126 dothreads = op & KERN_PROC_SHOW_THREADS; 127 op &= ~KERN_PROC_SHOW_THREADS; 128 129 /* 130 * Modelled on sysctl_doproc() in sys/kern/kern_sysctl.c 131 */ 132 for (; cnt < maxcnt && pr != NULL; pr = LIST_NEXT(&process, ps_list)) { 133 if (KREAD(kd, (u_long)pr, &process)) { 134 _kvm_err(kd, kd->program, "can't read process at %lx", 135 (u_long)pr); 136 return (-1); 137 } 138 if (process.ps_pgrp == NULL) 139 continue; 140 if (process.ps_flags & PS_EMBRYO) 141 continue; 142 if (KREAD(kd, (u_long)process.ps_mainproc, &proc)) { 143 _kvm_err(kd, kd->program, "can't read proc at %lx", 144 (u_long)process.ps_mainproc); 145 return (-1); 146 } 147 process_pid = proc.p_pid; 148 if (KREAD(kd, (u_long)process.ps_ucred, &ucred)) { 149 _kvm_err(kd, kd->program, "can't read ucred at %lx", 150 (u_long)process.ps_ucred); 151 return (-1); 152 } 153 if (KREAD(kd, (u_long)process.ps_pgrp, &pgrp)) { 154 _kvm_err(kd, kd->program, "can't read pgrp at %lx", 155 (u_long)process.ps_pgrp); 156 return (-1); 157 } 158 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 159 _kvm_err(kd, kd->program, "can't read session at %lx", 160 (u_long)pgrp.pg_session); 161 return (-1); 162 } 163 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL && 164 KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 165 _kvm_err(kd, kd->program, "can't read tty at %lx", 166 (u_long)sess.s_ttyp); 167 return (-1); 168 } 169 if (process.ps_pptr) { 170 if (KREAD(kd, (u_long)process.ps_pptr, &process2)) { 171 _kvm_err(kd, kd->program, 172 "can't read process at %lx", 173 (u_long)process.ps_pptr); 174 return (-1); 175 } 176 if (KREAD(kd, (u_long)process2.ps_mainproc, &proc2)) { 177 _kvm_err(kd, kd->program, 178 "can't read proc at %lx", 179 (u_long)process2.ps_mainproc); 180 return (-1); 181 } 182 parent_pid = proc2.p_pid; 183 } 184 else 185 parent_pid = 0; 186 if (sess.s_leader) { 187 if (KREAD(kd, (u_long)sess.s_leader, &process2)) { 188 _kvm_err(kd, kd->program, 189 "can't read proc at %lx", 190 (u_long)sess.s_leader); 191 return (-1); 192 } 193 if (KREAD(kd, (u_long)process2.ps_mainproc, &proc2)) { 194 _kvm_err(kd, kd->program, 195 "can't read proc at %lx", 196 (u_long)process2.ps_mainproc); 197 return (-1); 198 } 199 leader_pid = proc2.p_pid; 200 } 201 else 202 leader_pid = 0; 203 if (process.ps_sigacts) { 204 if (KREAD(kd, (u_long)process.ps_sigacts, &sa)) { 205 _kvm_err(kd, kd->program, 206 "can't read sigacts at %lx", 207 (u_long)process.ps_sigacts); 208 return (-1); 209 } 210 sap = &sa; 211 } 212 else 213 sap = NULL; 214 215 switch (op) { 216 case KERN_PROC_PID: 217 if (parent_pid != (pid_t)arg) 218 continue; 219 break; 220 221 case KERN_PROC_PGRP: 222 if (pgrp.pg_id != (pid_t)arg) 223 continue; 224 break; 225 226 case KERN_PROC_SESSION: 227 if (sess.s_leader == NULL || 228 leader_pid != (pid_t)arg) 229 continue; 230 break; 231 232 case KERN_PROC_TTY: 233 if ((process.ps_flags & PS_CONTROLT) == 0 || 234 sess.s_ttyp == NULL || 235 tty.t_dev != (dev_t)arg) 236 continue; 237 break; 238 239 case KERN_PROC_UID: 240 if (ucred.cr_uid != (uid_t)arg) 241 continue; 242 break; 243 244 case KERN_PROC_RUID: 245 if (ucred.cr_ruid != (uid_t)arg) 246 continue; 247 break; 248 249 case KERN_PROC_ALL: 250 if (proc.p_flag & P_SYSTEM) 251 continue; 252 break; 253 254 case KERN_PROC_KTHREAD: 255 /* no filtering */ 256 break; 257 258 default: 259 _kvm_err(kd, kd->program, "invalid filter"); 260 return (-1); 261 } 262 263 /* 264 * We're going to add another proc to the set. If this 265 * will overflow the buffer, assume the reason is because 266 * nthreads (or the proc list) is corrupt and declare an error. 267 */ 268 if (cnt >= maxcnt) { 269 _kvm_err(kd, kd->program, "nthreads corrupt"); 270 return (-1); 271 } 272 273 /* set up stuff that might not always be there */ 274 limp = &limits; 275 if (!process.ps_limit || 276 KREAD(kd, (u_long)process.ps_limit, &limits)) 277 limp = NULL; 278 279 vmp = NULL; 280 281 if ((process.ps_flags & PS_ZOMBIE) == 0 && 282 !KREAD(kd, (u_long)process.ps_vmspace, &vm)) 283 vmp = &vm; 284 285 #define do_copy_str(_d, _s, _l) kvm_read(kd, (u_long)(_s), (_d), (_l)-1) 286 FILL_KPROC(&kp, do_copy_str, &proc, &process, 287 &ucred, &pgrp, process.ps_mainproc, proc.p_p, &sess, 288 vmp, limp, sap, 0, 1); 289 290 /* stuff that's too painful to generalize */ 291 kp.p_pid = process_pid; 292 kp.p_ppid = parent_pid; 293 kp.p_sid = leader_pid; 294 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL) { 295 kp.p_tdev = tty.t_dev; 296 if (tty.t_pgrp != NULL && 297 tty.t_pgrp != process.ps_pgrp && 298 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 299 _kvm_err(kd, kd->program, 300 "can't read tpgrp at %lx", 301 (u_long)tty.t_pgrp); 302 return (-1); 303 } 304 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 305 kp.p_tsess = PTRTOINT64(tty.t_session); 306 } else { 307 kp.p_tpgid = -1; 308 kp.p_tdev = NODEV; 309 } 310 311 /* update %cpu for all threads */ 312 if (dothreads) { 313 kp.p_pctcpu = proc.p_pctcpu; 314 kp.p_stat = proc.p_stat; 315 } else { 316 kp.p_pctcpu = 0; 317 kp.p_stat = (process.ps_flags & PS_ZOMBIE) ? SDEAD : 318 SIDL; 319 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 320 p = TAILQ_NEXT(&proc, p_thr_link)) { 321 if (KREAD(kd, (u_long)p, &proc)) { 322 _kvm_err(kd, kd->program, 323 "can't read proc at %lx", 324 (u_long)p); 325 return (-1); 326 } 327 kp.p_pctcpu += proc.p_pctcpu; 328 /* 329 * find best state: 330 * ONPROC > RUN > STOP > SLEEP > ... 331 */ 332 if (proc.p_stat == SONPROC || 333 kp.p_stat == SONPROC) 334 kp.p_stat = SONPROC; 335 else if (proc.p_stat == SRUN || 336 kp.p_stat == SRUN) 337 kp.p_stat = SRUN; 338 else if (proc.p_stat == SSTOP || 339 kp.p_stat == SSTOP) 340 kp.p_stat = SSTOP; 341 else if (proc.p_stat == SSLEEP) 342 kp.p_stat = SSLEEP; 343 } 344 } 345 346 memcpy(bp, &kp, esize); 347 bp += esize; 348 ++cnt; 349 350 /* Skip per-thread entries if not required by op */ 351 if (!dothreads) 352 continue; 353 354 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 355 p = TAILQ_NEXT(&proc, p_thr_link)) { 356 if (KREAD(kd, (u_long)p, &proc)) { 357 _kvm_err(kd, kd->program, 358 "can't read proc at %lx", 359 (u_long)p); 360 return (-1); 361 } 362 FILL_KPROC(&kp, do_copy_str, &proc, &process, 363 &ucred, &pgrp, p, proc.p_p, &sess, vmp, limp, sap, 364 1, 1); 365 366 /* see above */ 367 kp.p_pid = process_pid; 368 kp.p_ppid = parent_pid; 369 kp.p_sid = leader_pid; 370 if ((process.ps_flags & PS_CONTROLT) && 371 sess.s_ttyp != NULL) { 372 kp.p_tdev = tty.t_dev; 373 if (tty.t_pgrp != NULL && 374 tty.t_pgrp != process.ps_pgrp && 375 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 376 _kvm_err(kd, kd->program, 377 "can't read tpgrp at %lx", 378 (u_long)tty.t_pgrp); 379 return (-1); 380 } 381 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 382 kp.p_tsess = PTRTOINT64(tty.t_session); 383 } else { 384 kp.p_tpgid = -1; 385 kp.p_tdev = NODEV; 386 } 387 } 388 389 memcpy(bp, &kp, esize); 390 bp += esize; 391 ++cnt; 392 #undef do_copy_str 393 } 394 return (cnt); 395 } 396 397 struct kinfo_proc * 398 kvm_getprocs(kvm_t *kd, int op, int arg, size_t esize, int *cnt) 399 { 400 int mib[6], st, nthreads; 401 void *procbase; 402 size_t size; 403 404 if ((ssize_t)esize < 0) 405 return (NULL); 406 407 if (ISALIVE(kd)) { 408 size = 0; 409 mib[0] = CTL_KERN; 410 mib[1] = KERN_PROC; 411 mib[2] = op; 412 mib[3] = arg; 413 mib[4] = esize; 414 415 do { 416 mib[5] = 0; 417 st = sysctl(mib, 6, NULL, &size, NULL, 0); 418 if (st == -1) { 419 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 420 return (NULL); 421 } 422 423 size += size / 8; /* add ~10% */ 424 425 procbase = _kvm_realloc(kd, kd->procbase, size); 426 if (procbase == NULL) 427 return (NULL); 428 429 kd->procbase = procbase; 430 431 mib[5] = size / esize; 432 st = sysctl(mib, 6, kd->procbase, &size, NULL, 0); 433 if (st == -1 && errno != ENOMEM) { 434 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 435 return (NULL); 436 } 437 } while (st == -1); 438 439 nthreads = size / esize; 440 } else { 441 struct nlist nl[5]; 442 int i, maxthread, maxprocess; 443 struct process *pr; 444 char *bp; 445 446 if (esize > sizeof(struct kinfo_proc)) { 447 _kvm_syserr(kd, kd->program, 448 "kvm_getprocs: unknown fields requested: libkvm out of date?"); 449 return (NULL); 450 } 451 452 memset(nl, 0, sizeof(nl)); 453 nl[0].n_name = "_nthreads"; 454 nl[1].n_name = "_nprocesses"; 455 nl[2].n_name = "_allprocess"; 456 nl[3].n_name = "_zombprocess"; 457 nl[4].n_name = NULL; 458 459 if (kvm_nlist(kd, nl) != 0) { 460 for (i = 0; nl[i].n_type != 0; ++i) 461 ; 462 _kvm_err(kd, kd->program, 463 "%s: no such symbol", nl[i].n_name); 464 return (NULL); 465 } 466 if (KREAD(kd, nl[0].n_value, &maxthread)) { 467 _kvm_err(kd, kd->program, "can't read nthreads"); 468 return (NULL); 469 } 470 if (KREAD(kd, nl[1].n_value, &maxprocess)) { 471 _kvm_err(kd, kd->program, "can't read nprocesses"); 472 return (NULL); 473 } 474 maxthread += maxprocess; 475 476 kd->procbase = _kvm_reallocarray(kd, NULL, maxthread, esize); 477 if (kd->procbase == 0) 478 return (NULL); 479 bp = (char *)kd->procbase; 480 481 /* allprocess */ 482 if (KREAD(kd, nl[2].n_value, &pr)) { 483 _kvm_err(kd, kd->program, "cannot read allprocess"); 484 return (NULL); 485 } 486 nthreads = kvm_proclist(kd, op, arg, pr, bp, maxthread, esize); 487 if (nthreads < 0) 488 return (NULL); 489 490 /* zombprocess */ 491 if (KREAD(kd, nl[3].n_value, &pr)) { 492 _kvm_err(kd, kd->program, "cannot read zombprocess"); 493 return (NULL); 494 } 495 i = kvm_proclist(kd, op, arg, pr, bp + (esize * nthreads), 496 maxthread - nthreads, esize); 497 if (i > 0) 498 nthreads += i; 499 } 500 if (kd->procbase != NULL) 501 *cnt = nthreads; 502 return (kd->procbase); 503 } 504