1 /* $OpenBSD: db_usrreq.c,v 1.21 2020/12/10 04:27:25 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 int error, ctlval; 52 53 /* All sysctl names at this level are terminal. */ 54 if (namelen != 1) 55 return (ENOTDIR); 56 57 switch (name[0]) { 58 case DBCTL_PANIC: 59 if (securelevel > 0) 60 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 61 &db_panic)); 62 else { 63 ctlval = db_panic; 64 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 65 &ctlval)) || newp == NULL) 66 return (error); 67 if (ctlval != 1 && ctlval != 0) 68 return (EINVAL); 69 db_panic = ctlval; 70 return (0); 71 } 72 break; 73 case DBCTL_CONSOLE: 74 if (securelevel > 0) 75 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 76 &db_console)); 77 else { 78 ctlval = db_console; 79 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 80 &ctlval)) || newp == NULL) 81 return (error); 82 if (ctlval != 1 && ctlval != 0) 83 return (EINVAL); 84 db_console = ctlval; 85 return (0); 86 } 87 break; 88 case DBCTL_TRIGGER: 89 if (newp && db_console) { 90 struct process *pr = curproc->p_p; 91 92 if (securelevel < 1 || 93 (pr->ps_flags & PS_CONTROLT && cn_tab && 94 cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) { 95 db_enter(); 96 newp = NULL; 97 } else 98 return (ENODEV); 99 } 100 return (sysctl_rdint(oldp, oldlenp, newp, 0)); 101 #if defined(DDBPROF) 102 case DBCTL_PROFILE: 103 if (securelevel > 0) 104 return (sysctl_int_lower(oldp, oldlenp, newp, newlen, 105 &db_profile)); 106 else { 107 ctlval = db_profile; 108 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, 109 &ctlval)) || newp == NULL) 110 return (error); 111 if (ctlval != 1 && ctlval != 0) 112 return (EINVAL); 113 db_profile = ctlval; 114 return (0); 115 } 116 break; 117 #endif /* DDBPROF */ 118 default: 119 return (sysctl_bounded_arr(ddb_vars, nitems(ddb_vars), name, 120 namelen, oldp, oldlenp, newp, newlen)); 121 } 122 /* NOTREACHED */ 123 } 124