freebsd_sysctl.c revision 1.11
1 /* $NetBSD: freebsd_sysctl.c,v 1.11 2007/12/20 23:02:48 dsl 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 1.11 2007/12/20 23:02:48 dsl 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(struct lwp *l, const struct freebsd_sys_sysctl_args *uap, register_t *retval) 86 { 87 /* { 88 syscallarg(int *) name; 89 syscallarg(u_int) namelen; 90 syscallarg(void *) old; 91 syscallarg(size_t *) oldlenp; 92 syscallarg(void *) new; 93 syscallarg(size_t) newlen; 94 } */ 95 int error; 96 int name[CTL_MAXNAME]; 97 size_t newlen, *oldlenp; 98 u_int namelen; 99 void *new, *old; 100 101 namelen = SCARG(uap, namelen); 102 103 if ((namelen > CTL_MAXNAME) || (namelen < 1)) 104 return EINVAL; 105 106 if ((error = copyin(SCARG(uap, name), name, 107 namelen * sizeof(*name))) != 0) 108 return error; 109 110 if (namelen > 0 && name[0] != 0) 111 return(sys___sysctl(l, (const void *)uap, retval)); 112 113 ktrmib(name, namelen); 114 115 /* 116 * FreeBSD sysctl uses an undocumented set of special OIDs in it's 117 * sysctl MIB whose tree is rooted at oid 0. These OIDs are 118 * interpretted by their sysctl to implement functions that NetBSD 119 * performs in libc, such as sysctlgetmibinfo. 120 * 121 * From the FreeBSD kern_sysctl.c, these OIDs are: 122 * {0,0} printf the entire MIB-tree. 123 * {0,1,...} return the name of the "..." OID. 124 * {0,2,...} return the next OID. 125 * {0,3} return the OID of the name in "new" 126 * {0,4,...} return the kind & format info for the "..." OID. 127 * {0,5,...} return the description the "..." OID. 128 * 129 * Only implement {0,3} for now. 130 */ 131 132 if (namelen < 2 || namelen > CTL_MAXNAME) 133 return(EINVAL); 134 135 if (name[1] == 3) { 136 char *locnew; 137 int oid[CTL_MAXNAME]; 138 u_int oidlen = CTL_MAXNAME; 139 140 new = SCARG(uap, new); 141 newlen = SCARG(uap, newlen); 142 if (new == NULL || newlen < 1 || 143 newlen > (SYSCTL_NAMELEN * CTL_MAXNAME)) 144 return(EINVAL); 145 146 old = SCARG(uap, old); 147 oldlenp = SCARG(uap, oldlenp); 148 if (old == NULL || oldlenp == NULL || *oldlenp < sizeof(int)) 149 return(EINVAL); 150 151 if ((locnew = 152 (char *) malloc(newlen + 1, M_TEMP, M_WAITOK)) == NULL) 153 return(ENOMEM); 154 155 if ((error = copyinstr(new, locnew, newlen + 1, NULL)) || 156 (error = sysctl_lock(l, old, *oldlenp))) { 157 free(locnew, M_TEMP); 158 return(error); 159 } 160 161 ktrmibio(-1, UIO_WRITE, new, newlen + 1, error); 162 error = freebsd_sysctl_name2oid(locnew, oid, &oidlen); 163 sysctl_unlock(l); 164 free(locnew, M_TEMP); 165 if (error) 166 return(error); 167 168 oidlen *= sizeof(int); 169 error = copyout(oid, SCARG(uap, old), 170 MIN(oidlen, *SCARG(uap, oldlenp))); 171 if (error) 172 return(error); 173 ktrmibio(-1, UIO_READ, SCARG(uap, old), 174 MIN(oidlen, *SCARG(uap, oldlenp)), 0); 175 176 error = copyout(&oidlen, SCARG(uap, oldlenp), sizeof(u_int)); 177 178 return(error); 179 } 180 181 return(EOPNOTSUPP); 182 } 183 184 static int 185 freebsd_sysctl_name2oid(char *name, int *oid, int *oidlen) 186 { 187 char *dot; 188 int oi, ci; 189 struct sysctlnode *node, *pnode; 190 191 pnode = &sysctl_root; 192 node = sysctl_root.sysctl_child; 193 oi = 0; 194 if ((dot = strchr(name, (int)'.')) != NULL) 195 *dot++ = '\0'; 196 197 next: 198 while (*name != '\0' && node != NULL) { 199 for (ci = 0; ci < pnode->sysctl_clen; ci++) { 200 if (strcmp(name, node[ci].sysctl_name) == 0) { 201 oid[oi++] = node[ci].sysctl_num; 202 if ((name = dot) == NULL) { 203 *oidlen = oi; 204 return(0); 205 } 206 if ((dot = strchr(name, (int)'.')) != NULL) 207 *dot++ = '\0'; 208 209 if (SYSCTL_TYPE(node[ci].sysctl_flags) != 210 CTLTYPE_NODE) 211 return(ENOTDIR); 212 213 pnode = &node[ci]; 214 node = pnode->sysctl_child; 215 goto next; 216 } 217 } 218 219 /* no more nodes, it must not exist */ 220 break; 221 } 222 223 return(ENOENT); 224 } 225
Indexes created Thu Sep 25 16:09:42 GMT 2025