1 /* $OpenBSD: db_usrreq.c,v 1.22 2021/01/09 20:58:12 gnezdo Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Michael Shalayeff. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/proc.h> 30 #include <sys/tty.h> 31 #include <sys/sysctl.h> 32 #include <dev/cons.h> 33 34 #include <ddb/db_var.h> 35 36 int db_log = 1; 37 int db_profile; /* Allow dynamic profiling */ 38 39 const struct sysctl_bounded_args ddb_vars[] = { 40 { DBCTL_RADIX, &db_radix, 8, 16 }, 41 { DBCTL_MAXWIDTH, &db_max_width, 0, INT_MAX }, 42 { DBCTL_TABSTOP, &db_tab_stop_width, 1, 16 }, 43 { DBCTL_MAXLINE, &db_max_line, 0, INT_MAX }, 44 { DBCTL_LOG, &db_log, 0, 1 }, 45 }; 46 47 int 48 ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 49 size_t newlen, struct proc *p) 50 { 51 /* All sysctl names at this level are terminal. */ 52 if (namelen != 1) 53 return (ENOTDIR); 54 55 switch (name[0]) { 56 case DBCTL_PANIC: 57 if (securelevel > 0) 58 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 59 &db_panic)); 60 else { 61 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen, 62 &db_panic, 0, 1)); 63 } 64 break; 65 case DBCTL_CONSOLE: 66 if (securelevel > 0) 67 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 68 &db_console)); 69 else { 70 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen, 71 &db_console, 0, 1)); 72 } 73 break; 74 case DBCTL_TRIGGER: 75 if (newp && db_console) { 76 struct process *pr = curproc->p_p; 77 78 if (securelevel < 1 || 79 (pr->ps_flags & PS_CONTROLT && cn_tab && 80 cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) { 81 db_enter(); 82 newp = NULL; 83 } else 84 return (ENODEV); 85 } 86 return (sysctl_rdint(oldp, oldlenp, newp, 0)); 87 #if defined(DDBPROF) 88 case DBCTL_PROFILE: 89 if (securelevel > 0) 90 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 91 &db_profile)); 92 else { 93 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen, 94 &db_profile, 0, 1)); 95 } 96 break; 97 #endif /* DDBPROF */ 98 default: 99 return (sysctl_bounded_arr(ddb_vars, nitems(ddb_vars), name, 100 namelen, oldp, oldlenp, newp, newlen)); 101 } 102 /* NOTREACHED */ 103 } 104