freebsd_sysctl.c revision 1.9
1 /* $NetBSD: freebsd_sysctl.c,v 1.9 2007/08/15 12:07:28 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * FreeBSD compatibility module. Try to deal with various FreeBSD sysctl calls. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: freebsd_sysctl.c,v 1.9 2007/08/15 12:07:28 ad Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/signal.h> 51 #include <sys/signalvar.h> 52 #include <sys/malloc.h> 53 #include <sys/mman.h> 54 #include <sys/sysctl.h> 55 #include <sys/ktrace.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <compat/freebsd/freebsd_syscallargs.h> 60 #include <compat/common/compat_util.h> 61 #include <compat/freebsd/freebsd_rtprio.h> 62 #include <compat/freebsd/freebsd_timex.h> 63 #include <compat/freebsd/freebsd_signal.h> 64 #include <compat/freebsd/freebsd_mman.h> 65 66 static int freebsd_sysctl_name2oid(char *, int *, int *); 67 68 SYSCTL_SETUP_PROTO(freebsd_sysctl_setup); 69 SYSCTL_SETUP(freebsd_sysctl_setup, "freebsd emulated sysctl setup") 70 { 71 sysctl_createv(clog, 0, NULL, NULL, 72 CTLFLAG_PERMANENT, 73 CTLTYPE_NODE, "kern", NULL, 74 NULL, 0, NULL, 0, 75 CTL_KERN, CTL_EOL); 76 sysctl_createv(clog, 0, NULL, NULL, 77 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 78 CTLTYPE_INT, "osreldate", 79 SYSCTL_DESCR("Operating system revision"), 80 NULL, __NetBSD_Version__, NULL, 0, 81 CTL_KERN, CTL_CREATE, CTL_EOL); 82 } 83 84 int 85 freebsd_sys_sysctl(l, v, retval) 86 struct lwp *l; 87 void *v; 88 register_t *retval; 89 { 90 struct freebsd_sys_sysctl_args /* { 91 syscallarg(int *) name; 92 syscallarg(u_int) namelen; 93 syscallarg(void *) old; 94 syscallarg(size_t *) oldlenp; 95 syscallarg(void *) new; 96 syscallarg(size_t) newlen; 97 } */ *uap = v; 98 int error; 99 int name[CTL_MAXNAME]; 100 size_t newlen, *oldlenp; 101 u_int namelen; 102 void *new, *old; 103 104 namelen = SCARG(uap, namelen); 105 106 if ((namelen > CTL_MAXNAME) || (namelen < 1)) 107 return EINVAL; 108 109 if ((error = copyin(SCARG(uap, name), name, 110 namelen * sizeof(*name))) != 0) 111 return error; 112 113 if (namelen > 0 && name[0] != 0) 114 return(sys___sysctl(l, v, retval)); 115 116 ktrmib(name, namelen); 117 118 /* 119 * FreeBSD sysctl uses an undocumented set of special OIDs in it's 120 * sysctl MIB whose tree is rooted at oid 0. These OIDs are 121 * interpretted by their sysctl to implement functions that NetBSD 122 * performs in libc, such as sysctlgetmibinfo. 123 * 124 * From the FreeBSD kern_sysctl.c, these OIDs are: 125 * {0,0} printf the entire MIB-tree. 126 * {0,1,...} return the name of the "..." OID. 127 * {0,2,...} return the next OID. 128 * {0,3} return the OID of the name in "new" 129 * {0,4,...} return the kind & format info for the "..." OID. 130 * {0,5,...} return the description the "..." OID. 131 * 132 * Only implement {0,3} for now. 133 */ 134 135 if (namelen < 2 || namelen > CTL_MAXNAME) 136 return(EINVAL); 137 138 if (name[1] == 3) { 139 char *locnew; 140 int oid[CTL_MAXNAME]; 141 u_int oidlen = CTL_MAXNAME; 142 143 new = SCARG(uap, new); 144 newlen = SCARG(uap, newlen); 145 if (new == NULL || newlen < 1 || 146 newlen > (SYSCTL_NAMELEN * CTL_MAXNAME)) 147 return(EINVAL); 148 149 old = SCARG(uap, old); 150 oldlenp = SCARG(uap, oldlenp); 151 if (old == NULL || oldlenp == NULL || *oldlenp < sizeof(int)) 152 return(EINVAL); 153 154 if ((locnew = 155 (char *) malloc(newlen + 1, M_TEMP, M_WAITOK)) == NULL) 156 return(ENOMEM); 157 158 if ((error = copyinstr(new, locnew, newlen + 1, NULL)) || 159 (error = sysctl_lock(l, old, *oldlenp))) { 160 free(locnew, M_TEMP); 161 return(error); 162 } 163 164 ktrmibio(-1, UIO_WRITE, new, newlen + 1, error); 165 error = freebsd_sysctl_name2oid(locnew, oid, &oidlen); 166 sysctl_unlock(l); 167 free(locnew, M_TEMP); 168 if (error) 169 return(error); 170 171 oidlen *= sizeof(int); 172 error = copyout(oid, SCARG(uap, old), 173 MIN(oidlen, *SCARG(uap, oldlenp))); 174 if (error) 175 return(error); 176 ktrmibio(-1, UIO_READ, SCARG(uap, old), 177 MIN(oidlen, *SCARG(uap, oldlenp)), 0); 178 179 error = copyout(&oidlen, SCARG(uap, oldlenp), sizeof(u_int)); 180 181 return(error); 182 } 183 184 return(EOPNOTSUPP); 185 } 186 187 static int 188 freebsd_sysctl_name2oid(char *name, int *oid, int *oidlen) 189 { 190 char *dot; 191 int oi, ci; 192 struct sysctlnode *node, *pnode; 193 194 pnode = &sysctl_root; 195 node = sysctl_root.sysctl_child; 196 oi = 0; 197 if ((dot = strchr(name, (int)'.')) != NULL) 198 *dot++ = '\0'; 199 200 next: 201 while (*name != '\0' && node != NULL) { 202 for (ci = 0; ci < pnode->sysctl_clen; ci++) { 203 if (strcmp(name, node[ci].sysctl_name) == 0) { 204 oid[oi++] = node[ci].sysctl_num; 205 if ((name = dot) == NULL) { 206 *oidlen = oi; 207 return(0); 208 } 209 if ((dot = strchr(name, (int)'.')) != NULL) 210 *dot++ = '\0'; 211 212 if (SYSCTL_TYPE(node[ci].sysctl_flags) != 213 CTLTYPE_NODE) 214 return(ENOTDIR); 215 216 pnode = &node[ci]; 217 node = pnode->sysctl_child; 218 goto next; 219 } 220 } 221 222 /* no more nodes, it must not exist */ 223 break; 224 } 225 226 return(ENOENT); 227 } 228
Indexes created Thu Sep 25 16:09:42 GMT 2025