sys/emulation/43bsd/43bsd_hostinfo.c

   1 /*
   2  * 43BSD_HOSTINFO.C     - 4.3BSD compatibility host info syscalls
   3  *
   4  * Copyright (c) 1982, 1986, 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $DragonFly: src/sys/emulation/43bsd/43bsd_hostinfo.c,v 1.4 2006/09/05 00:55:44 dillon Exp $
  32  *      from: DragonFly kern/kern_xxx.c,v 1.7
  33  *      from: DragonFly kern/kern_sysctl.c,v 1.12
  34  *
  35  * These syscalls used to live in kern/kern_xxx.c and kern/kern_sysctl.c.
  36  */
  37
  38 #include "opt_compat.h"
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/sysproto.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/priv.h>
  46 #include <sys/socket.h>
  47 #include <sys/sysctl.h>
  48
  49 #include <vm/vm_param.h>
  50
  51 int
  52 sys_ogethostname(struct gethostname_args *uap)
  53 {
  54         size_t len;
  55         char *hostname;
  56         int error, name[2];
  57
  58         name[0] = CTL_KERN;
  59         name[1] = KERN_HOSTNAME;
  60         len = MIN(uap->len, MAXHOSTNAMELEN);
  61         hostname = kmalloc(MAXHOSTNAMELEN, M_TEMP, M_WAITOK);
  62
  63         error = kernel_sysctl(name, 2, hostname, &len, NULL, 0, NULL);
  64
  65         if (error == 0)
  66                 error = copyout(hostname, uap->hostname, len);
  67
  68         kfree(hostname, M_TEMP);
  69         return (error);
  70 }
  71
  72 int
  73 sys_osethostname(struct sethostname_args *uap)
  74 {
  75         struct thread *td = curthread;
  76         size_t len;
  77         char *hostname;
  78         int name[2];
  79         int error;
  80
  81         name[0] = CTL_KERN;
  82         name[1] = KERN_HOSTNAME;
  83         error = priv_check_cred(td->td_ucred, PRIV_SETHOSTNAME, 0);
  84         if (error)
  85                 return (error);
  86         len = MIN(uap->len, MAXHOSTNAMELEN);
  87         hostname = kmalloc(MAXHOSTNAMELEN, M_TEMP, M_WAITOK);
  88
  89         error = copyin(uap->hostname, hostname, len);
  90         if (error) {
  91                 kfree(hostname, M_TEMP);
  92                 return (error);
  93         }
  94
  95         error = kernel_sysctl(name, 2, NULL, 0, hostname, len, NULL);
  96
  97         kfree(hostname, M_TEMP);
  98         return (error);
  99 }
 100
 101 /*
 102  * MPSAFE
 103  */
 104 int
 105 sys_ogethostid(struct ogethostid_args *uap)
 106 {
 107         uap->sysmsg_lresult = hostid;
 108         return (0);
 109 }
 110
 111 /*
 112  * MPSAFE
 113  */
 114 int
 115 sys_osethostid(struct osethostid_args *uap)
 116 {
 117         struct thread *td = curthread;
 118         int error;
 119
 120         error = priv_check(td, PRIV_ROOT);
 121         if (error)
 122                 return (error);
 123         hostid = uap->hostid;
 124         return (0);
 125 }
 126
 127 /*
 128  * MPSAFE
 129  */
 130 int
 131 sys_oquota(struct oquota_args *uap)
 132 {
 133         return (ENOSYS);
 134 }
 135
 136 #define KINFO_PROC              (0<<8)
 137 #define KINFO_RT                (1<<8)
 138 #define KINFO_VNODE             (2<<8)
 139 #define KINFO_FILE              (3<<8)
 140 #define KINFO_METER             (4<<8)
 141 #define KINFO_LOADAVG           (5<<8)
 142 #define KINFO_CLOCKRATE         (6<<8)
 143
 144 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
 145 #define KINFO_BSDI_SYSINFO      (101<<8)
 146
 147 /*
 148  * XXX this is bloat, but I hope it's better here than on the potentially
 149  * limited kernel stack...  -Peter
 150  */
 151
 152 static struct {
 153         int     bsdi_machine;           /* "i386" on BSD/386 */
 154 /*      ^^^ this is an offset to the string, relative to the struct start */
 155         char    *pad0;
 156         long    pad1;
 157         long    pad2;
 158         long    pad3;
 159         u_long  pad4;
 160         u_long  pad5;
 161         u_long  pad6;
 162
 163         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
 164         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
 165         long    pad7;
 166         long    pad8;
 167         char    *pad9;
 168
 169         long    pad10;
 170         long    pad11;
 171         int     pad12;
 172         long    pad13;
 173         quad_t  pad14;
 174         long    pad15;
 175
 176         struct  timeval pad16;
 177         /* we dont set this, because BSDI's uname used gethostname() instead */
 178         int     bsdi_hostname;          /* hostname on BSD/386 */
 179
 180         /* the actual string data is appended here */
 181
 182 } bsdi_si;
 183 /*
 184  * this data is appended to the end of the bsdi_si structure during copyout.
 185  * The "char *" offsets are relative to the base of the bsdi_si struct.
 186  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
 187  * should not exceed the length of the buffer here... (or else!! :-)
 188  */
 189 static char bsdi_strings[80];   /* It had better be less than this! */
 190
 191 /*
 192  * MPALMOSTSAFE
 193  */
 194 int
 195 sys_ogetkerninfo(struct getkerninfo_args *uap)
 196 {
 197         int error, name[6];
 198         size_t size;
 199         u_int needed = 0;
 200
 201         switch (uap->op & 0xff00) {
 202         case KINFO_RT:
 203                 name[0] = CTL_NET;
 204                 name[1] = PF_ROUTE;
 205                 name[2] = 0;
 206                 name[3] = (uap->op & 0xff0000) >> 16;
 207                 name[4] = uap->op & 0xff;
 208                 name[5] = uap->arg;
 209                 error = userland_sysctl(name, 6, uap->where, uap->size,
 210                         0, 0, 0, &size);
 211                 break;
 212
 213         case KINFO_VNODE:
 214                 name[0] = CTL_KERN;
 215                 name[1] = KERN_VNODE;
 216                 error = userland_sysctl(name, 2, uap->where, uap->size,
 217                         0, 0, 0, &size);
 218                 break;
 219
 220         case KINFO_PROC:
 221                 name[0] = CTL_KERN;
 222                 name[1] = KERN_PROC;
 223                 name[2] = uap->op & 0xff;
 224                 name[3] = uap->arg;
 225                 error = userland_sysctl(name, 4, uap->where, uap->size,
 226                         0, 0, 0, &size);
 227                 break;
 228
 229         case KINFO_FILE:
 230                 name[0] = CTL_KERN;
 231                 name[1] = KERN_FILE;
 232                 error = userland_sysctl(name, 2, uap->where, uap->size,
 233                         0, 0, 0, &size);
 234                 break;
 235
 236         case KINFO_METER:
 237                 name[0] = CTL_VM;
 238                 name[1] = VM_METER;
 239                 error = userland_sysctl(name, 2, uap->where, uap->size,
 240                         0, 0, 0, &size);
 241                 break;
 242
 243         case KINFO_LOADAVG:
 244                 name[0] = CTL_VM;
 245                 name[1] = VM_LOADAVG;
 246                 error = userland_sysctl(name, 2, uap->where, uap->size,
 247                         0, 0, 0, &size);
 248                 break;
 249
 250         case KINFO_CLOCKRATE:
 251                 name[0] = CTL_KERN;
 252                 name[1] = KERN_CLOCKRATE;
 253                 error = userland_sysctl(name, 2, uap->where, uap->size,
 254                         0, 0, 0, &size);
 255                 break;
 256
 257         case KINFO_BSDI_SYSINFO: {
 258                 /*
 259                  * this is pretty crude, but it's just enough for uname()
 260                  * from BSDI's 1.x libc to work.
 261                  * *size gives the size of the buffer before the call, and
 262                  * the amount of data copied after a successful call.
 263                  * If successful, the return value is the amount of data
 264                  * available, which can be larger than *size.
 265                  *
 266                  * BSDI's 2.x product apparently fails with ENOMEM if
 267                  * *size is too small.
 268                  */
 269
 270                 u_int left;
 271                 char *s;
 272
 273                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
 274                 bzero(bsdi_strings, sizeof(bsdi_strings));
 275
 276                 s = bsdi_strings;
 277
 278                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
 279                 strcpy(s, ostype);
 280                 s += strlen(s) + 1;
 281
 282                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
 283                 strcpy(s, osrelease);
 284                 s += strlen(s) + 1;
 285
 286                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
 287                 strcpy(s, machine);
 288                 s += strlen(s) + 1;
 289
 290                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
 291
 292                 if (uap->where == NULL || (uap->size == NULL)) {
 293                         /* process is asking how much buffer to supply.. */
 294                         size = needed;
 295                         error = 0;
 296                         break;
 297                 }
 298
 299                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
 300                                 break;
 301
 302                 /* if too much buffer supplied, trim it down */
 303                 if (size > needed)
 304                         size = needed;
 305
 306                 /* how much of the buffer is remaining */
 307                 left = size;
 308
 309                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
 310                         break;
 311
 312                 /* is there any point in continuing? */
 313                 if (left > sizeof(bsdi_si)) {
 314                         left -= sizeof(bsdi_si);
 315                         error = copyout(&bsdi_strings,
 316                                         uap->where + sizeof(bsdi_si), left);
 317                 }
 318                 break;
 319         }
 320         default:
 321                 error = EOPNOTSUPP;
 322                 break;
 323         }
 324
 325         if (error)
 326                 return (error);
 327         uap->sysmsg_iresult = (int)size;
 328         if (uap->size)
 329                 error = copyout(&size, uap->size, sizeof(size));
 330         return (error);
 331 }