usr.bin/uname/uname.c

   1 /*-
   2  * Copyright (c) 2002 Juli Mallett.
   3  * Copyright (c) 1993
   4  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  35  * @(#)uname.c  8.2 (Berkeley) 5/4/95
  36  * $FreeBSD: src/usr.bin/uname/uname.c,v 1.4.6.2 2002/10/17 07:47:29 jmallett Exp $
  37  * $DragonFly: src/usr.bin/uname/uname.c,v 1.5 2007/01/04 14:19:03 y0netan1 Exp $
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/sysctl.h>
  42
  43 #include <err.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47
  48 #ifndef HW_MACHINE_UNAME
  49 #define HW_MACHINE_UNAME        HW_MACHINE
  50 #endif
  51
  52 #define MFLAG   0x01
  53 #define NFLAG   0x02
  54 #define PFLAG   0x04
  55 #define RFLAG   0x08
  56 #define SFLAG   0x10
  57 #define VFLAG   0x20
  58 #define IFLAG   0x40
  59
  60 typedef void (*get_t)(void);
  61 get_t get_ident, get_platform, get_hostname, get_arch, get_release, get_sysname, get_version;
  62
  63 void native_ident(void);
  64 void native_platform(void);
  65 void native_hostname(void);
  66 void native_arch(void);
  67 void native_release(void);
  68 void native_sysname(void);
  69 void native_version(void);
  70 void print_uname(u_int);
  71 void setup_get(void);
  72 void usage(void);
  73
  74 char *ident, *platform, *hostname, *arch, *release, *sysname, *version;
  75 int space;
  76
  77 int
  78 main(int argc, char *argv[])
  79 {
  80         u_int flags;
  81         int ch;
  82
  83         setup_get();
  84         flags = 0;
  85
  86         while ((ch = getopt(argc, argv, "aimnprsv")) != -1)
  87                 switch(ch) {
  88                 case 'a':
  89                         flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
  90                         break;
  91                 case 'i':
  92                         flags |= IFLAG;
  93                         break;
  94                 case 'm':
  95                         flags |= MFLAG;
  96                         break;
  97                 case 'n':
  98                         flags |= NFLAG;
  99                         break;
 100                 case 'p':
 101                         flags |= PFLAG;
 102                         break;
 103                 case 'r':
 104                         flags |= RFLAG;
 105                         break;
 106                 case 's':
 107                         flags |= SFLAG;
 108                         break;
 109                 case 'v':
 110                         flags |= VFLAG;
 111                         break;
 112                 case '?':
 113                 default:
 114                         usage();
 115                 }
 116
 117         argc -= optind;
 118         argv += optind;
 119
 120         if (argc)
 121                 usage();
 122
 123         if (!flags)
 124                 flags |= SFLAG;
 125
 126         print_uname(flags);
 127         exit(0);
 128 }
 129
 130 #define CHECK_ENV(opt,var)                              \
 131 do {                                                    \
 132         if ((var = getenv("UNAME_" opt)) == NULL) {     \
 133                 get_##var = native_##var;               \
 134         } else {                                        \
 135                 get_##var = (get_t)NULL;                \
 136         }                                               \
 137 } while (0)
 138
 139 void
 140 setup_get(void)
 141 {
 142         CHECK_ENV("s", sysname);
 143         CHECK_ENV("n", hostname);
 144         CHECK_ENV("r", release);
 145         CHECK_ENV("v", version);
 146         CHECK_ENV("m", platform);
 147         CHECK_ENV("p", arch);
 148         CHECK_ENV("i", ident);
 149 }
 150
 151 #define PRINT_FLAG(flags,flag,var)              \
 152         if ((flags & flag) == flag) {           \
 153                 if (space)                      \
 154                         printf(" ");            \
 155                 else                            \
 156                         space++;                \
 157                 if (get_##var != NULL)          \
 158                         (*get_##var)();         \
 159                 printf("%s", var);              \
 160         }
 161
 162 void
 163 print_uname(u_int flags)
 164 {
 165         PRINT_FLAG(flags, SFLAG, sysname);
 166         PRINT_FLAG(flags, NFLAG, hostname);
 167         PRINT_FLAG(flags, RFLAG, release);
 168         PRINT_FLAG(flags, VFLAG, version);
 169         PRINT_FLAG(flags, MFLAG, platform);
 170         PRINT_FLAG(flags, PFLAG, arch);
 171         PRINT_FLAG(flags, IFLAG, ident);
 172         printf("\n");
 173 }
 174
 175 #define NATIVE_SYSCTL2_GET(var,mib0,mib1)       \
 176 void                                            \
 177 native_##var(void)                              \
 178 {                                               \
 179         int mib[] = { (mib0), (mib1) };         \
 180         size_t len;                             \
 181         static char buf[1024];                  \
 182         char **varp = &(var);                   \
 183                                                 \
 184         len = sizeof buf;                       \
 185         if (sysctl(mib, sizeof mib / sizeof mib[0],     \
 186            &buf, &len, NULL, 0) == -1)          \
 187                 err(1, "sysctl");
 188
 189 #define NATIVE_SYSCTLNAME_GET(var,name)         \
 190 void                                            \
 191 native_##var(void)                              \
 192 {                                               \
 193         size_t len;                             \
 194         static char buf[1024];                  \
 195         char **varp = &(var);                   \
 196                                                 \
 197         len = sizeof buf;                       \
 198         if (sysctlbyname(name, &buf, &len, NULL,\
 199             0) == -1)                           \
 200                 err(1, "sysctlbyname");
 201
 202 #define NATIVE_SET                              \
 203         *varp = buf;                            \
 204         return;                                 \
 205 }       struct __hack
 206
 207 #define NATIVE_BUFFER   (buf)
 208 #define NATIVE_LENGTH   (len)
 209
 210 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
 211 } NATIVE_SET;
 212
 213 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
 214 } NATIVE_SET;
 215
 216 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
 217 } NATIVE_SET;
 218
 219 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
 220         size_t n;
 221         char *p;
 222
 223         p = NATIVE_BUFFER;
 224         n = NATIVE_LENGTH;
 225         for (; n--; ++p)
 226                 if (*p == '\n' || *p == '\t')
 227                         *p = ' ';
 228 } NATIVE_SET;
 229
 230 NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE_UNAME) {
 231 } NATIVE_SET;
 232
 233 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
 234 } NATIVE_SET;
 235
 236 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
 237 } NATIVE_SET;
 238
 239 void
 240 usage(void)
 241 {
 242         fprintf(stderr, "usage: uname [-aimnprsv]\n");
 243         exit(1);
 244 }