1 /* $OpenBSD: db_usrreq.c,v 1.20 2017/09/08 05:36:52 deraadt 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 int 40 ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 41 size_t newlen, struct proc *p) 42 { 43 int error, ctlval; 44 45 /* All sysctl names at this level are terminal. */ 46 if (namelen != 1) 47 return (ENOTDIR); 48 49 switch (name[0]) { 50 51 case DBCTL_RADIX: 52 return sysctl_int(oldp, oldlenp, newp, newlen, &db_radix); 53 case DBCTL_MAXWIDTH: 54 return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_width); 55 case DBCTL_TABSTOP: 56 return sysctl_int(oldp, oldlenp, newp, newlen, &db_tab_stop_width); 57 case DBCTL_MAXLINE: 58 return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line); 59 case DBCTL_PANIC: 60 if (securelevel > 0) 61 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 62 &db_panic)); 63 else { 64 ctlval = db_panic; 65 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 66 &ctlval)) || newp == NULL) 67 return (error); 68 if (ctlval != 1 && ctlval != 0) 69 return (EINVAL); 70 db_panic = ctlval; 71 return (0); 72 } 73 break; 74 case DBCTL_CONSOLE: 75 if (securelevel > 0) 76 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 77 &db_console)); 78 else { 79 ctlval = db_console; 80 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 81 &ctlval)) || newp == NULL) 82 return (error); 83 if (ctlval != 1 && ctlval != 0) 84 return (EINVAL); 85 db_console = ctlval; 86 return (0); 87 } 88 break; 89 case DBCTL_LOG: 90 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_log)); 91 case DBCTL_TRIGGER: 92 if (newp && db_console) { 93 struct process *pr = curproc->p_p; 94 95 if (securelevel < 1 || 96 (pr->ps_flags & PS_CONTROLT && cn_tab && 97 cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) { 98 db_enter(); 99 newp = NULL; 100 } else 101 return (ENODEV); 102 } 103 return (sysctl_rdint(oldp, oldlenp, newp, 0)); 104 #if defined(DDBPROF) 105 case DBCTL_PROFILE: 106 if (securelevel > 0) 107 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 108 &db_profile)); 109 else { 110 ctlval = db_profile; 111 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 112 &ctlval)) || newp == NULL) 113 return (error); 114 if (ctlval != 1 && ctlval != 0) 115 return (EINVAL); 116 db_profile = ctlval; 117 return (0); 118 } 119 break; 120 #endif /* DDBPROF */ 121 default: 122 return (EOPNOTSUPP); 123 } 124 /* NOTREACHED */ 125 } 126