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
  35 #include <sys/cdefs.h>
  36
  37 __FBSDID("$FreeBSD$");
  38
  39 #ifndef lint
  40 static const char copyright[] =
  41 "@(#) Copyright (c) 1993\n\
  42         The Regents of the University of California.  All rights reserved.\n";
  43 #endif
  44
  45 #ifndef lint
  46 static const char sccsid[] = "@(#)uname.c       8.2 (Berkeley) 5/4/95";
  47 #endif
  48
  49 #include <sys/param.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <err.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <unistd.h>
  56
  57 #define MFLAG   0x01
  58 #define NFLAG   0x02
  59 #define PFLAG   0x04
  60 #define RFLAG   0x08
  61 #define SFLAG   0x10
  62 #define VFLAG   0x20
  63 #define IFLAG   0x40
  64
  65 typedef void (*get_t)(void);
  66 get_t get_ident, get_platform, get_hostname, get_arch, get_release, get_sysname, get_version;
  67
  68 void native_ident(void);
  69 void native_platform(void);
  70 void native_hostname(void);
  71 void native_arch(void);
  72 void native_release(void);
  73 void native_sysname(void);
  74 void native_version(void);
  75 void print_uname(u_int);
  76 void setup_get(void);
  77 void usage(void);
  78
  79 char *ident, *platform, *hostname, *arch, *release, *sysname, *version;
  80 int space;
  81
  82 int
  83 main(int argc, char *argv[])
  84 {
  85         u_int flags;
  86         int ch;
  87
  88         setup_get();
  89         flags = 0;
  90
  91         while ((ch = getopt(argc, argv, "aimnprsv")) != -1)
  92                 switch(ch) {
  93                 case 'a':
  94                         flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
  95                         break;
  96                 case 'i':
  97                         flags |= IFLAG;
  98                         break;
  99                 case 'm':
 100                         flags |= MFLAG;
 101                         break;
 102                 case 'n':
 103                         flags |= NFLAG;
 104                         break;
 105                 case 'p':
 106                         flags |= PFLAG;
 107                         break;
 108                 case 'r':
 109                         flags |= RFLAG;
 110                         break;
 111                 case 's':
 112                         flags |= SFLAG;
 113                         break;
 114                 case 'v':
 115                         flags |= VFLAG;
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage();
 120                 }
 121
 122         argc -= optind;
 123         argv += optind;
 124
 125         if (argc)
 126                 usage();
 127
 128         if (!flags)
 129                 flags |= SFLAG;
 130
 131         print_uname(flags);
 132         exit(0);
 133 }
 134
 135 #define CHECK_ENV(opt,var)                              \
 136 do {                                                    \
 137         if ((var = getenv("UNAME_" opt)) == NULL) {     \
 138                 get_##var = native_##var;               \
 139         } else {                                        \
 140                 get_##var = (get_t)NULL;                \
 141         }                                               \
 142 } while (0)
 143
 144 void
 145 setup_get(void)
 146 {
 147         CHECK_ENV("s", sysname);
 148         CHECK_ENV("n", hostname);
 149         CHECK_ENV("r", release);
 150         CHECK_ENV("v", version);
 151         CHECK_ENV("m", platform);
 152         CHECK_ENV("p", arch);
 153         CHECK_ENV("i", ident);
 154 }
 155
 156 #define PRINT_FLAG(flags,flag,var)              \
 157         if ((flags & flag) == flag) {           \
 158                 if (space)                      \
 159                         printf(" ");            \
 160                 else                            \
 161                         space++;                \
 162                 if (get_##var != NULL)          \
 163                         (*get_##var)();         \
 164                 printf("%s", var);              \
 165         }
 166
 167 void
 168 print_uname(u_int flags)
 169 {
 170         PRINT_FLAG(flags, SFLAG, sysname);
 171         PRINT_FLAG(flags, NFLAG, hostname);
 172         PRINT_FLAG(flags, RFLAG, release);
 173         PRINT_FLAG(flags, VFLAG, version);
 174         PRINT_FLAG(flags, MFLAG, platform);
 175         PRINT_FLAG(flags, PFLAG, arch);
 176         PRINT_FLAG(flags, IFLAG, ident);
 177         printf("\n");
 178 }
 179
 180 #define NATIVE_SYSCTL2_GET(var,mib0,mib1)       \
 181 void                                            \
 182 native_##var(void)                              \
 183 {                                               \
 184         int mib[] = { (mib0), (mib1) };         \
 185         size_t len;                             \
 186         static char buf[1024];                  \
 187         char **varp = &(var);                   \
 188                                                 \
 189         len = sizeof buf;                       \
 190         if (sysctl(mib, sizeof mib / sizeof mib[0],     \
 191            &buf, &len, NULL, 0) == -1)          \
 192                 err(1, "sysctl");
 193
 194 #define NATIVE_SYSCTLNAME_GET(var,name)         \
 195 void                                            \
 196 native_##var(void)                              \
 197 {                                               \
 198         size_t len;                             \
 199         static char buf[1024];                  \
 200         char **varp = &(var);                   \
 201                                                 \
 202         len = sizeof buf;                       \
 203         if (sysctlbyname(name, &buf, &len, NULL,\
 204             0) == -1)                           \
 205                 err(1, "sysctlbyname");
 206
 207 #define NATIVE_SET                              \
 208         *varp = buf;                            \
 209         return;                                 \
 210 }       struct __hack
 211
 212 #define NATIVE_BUFFER   (buf)
 213 #define NATIVE_LENGTH   (len)
 214
 215 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
 216 } NATIVE_SET;
 217
 218 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
 219 } NATIVE_SET;
 220
 221 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
 222 } NATIVE_SET;
 223
 224 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
 225         size_t n;
 226         char *p;
 227
 228         p = NATIVE_BUFFER;
 229         n = NATIVE_LENGTH;
 230         for (; n--; ++p)
 231                 if (*p == '\n' || *p == '\t')
 232                         *p = ' ';
 233 } NATIVE_SET;
 234
 235 NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
 236 } NATIVE_SET;
 237
 238 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
 239 } NATIVE_SET;
 240
 241 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
 242 } NATIVE_SET;
 243
 244 void
 245 usage(void)
 246 {
 247         fprintf(stderr, "usage: uname [-aimnprsv]\n");
 248         exit(1);
 249 }