usr.bin/uname/uname.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 2002 Juli Mallett.
   5  * Copyright (c) 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38
  39 __FBSDID("$FreeBSD$");
  40
  41 #ifndef lint
  42 static const char copyright[] =
  43 "@(#) Copyright (c) 1993\n\
  44         The Regents of the University of California.  All rights reserved.\n";
  45 #endif
  46
  47 #ifndef lint
  48 static const char sccsid[] = "@(#)uname.c       8.2 (Berkeley) 5/4/95";
  49 #endif
  50
  51 #include <sys/param.h>
  52 #include <sys/sysctl.h>
  53
  54 #include <err.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <unistd.h>
  58
  59 #include <osreldate.h>
  60
  61 #define MFLAG   0x01
  62 #define NFLAG   0x02
  63 #define PFLAG   0x04
  64 #define RFLAG   0x08
  65 #define SFLAG   0x10
  66 #define VFLAG   0x20
  67 #define IFLAG   0x40
  68 #define UFLAG   0x80
  69 #define KFLAG   0x100
  70
  71 typedef void (*get_t)(void);
  72 static get_t get_ident, get_platform, get_hostname, get_arch,
  73     get_release, get_sysname, get_kernvers, get_uservers, get_version;
  74
  75 static void native_ident(void);
  76 static void native_platform(void);
  77 static void native_hostname(void);
  78 static void native_arch(void);
  79 static void native_release(void);
  80 static void native_sysname(void);
  81 static void native_version(void);
  82 static void native_kernvers(void);
  83 static void native_uservers(void);
  84 static void print_uname(u_int);
  85 static void setup_get(void);
  86 static void usage(void);
  87
  88 static char *ident, *platform, *hostname, *arch, *release, *sysname, *version, *kernvers, *uservers;
  89 static int space;
  90
  91 int
  92 main(int argc, char *argv[])
  93 {
  94         u_int flags;
  95         int ch;
  96
  97         setup_get();
  98         flags = 0;
  99
 100         while ((ch = getopt(argc, argv, "aiKmnoprsUv")) != -1)
 101                 switch(ch) {
 102                 case 'a':
 103                         flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
 104                         break;
 105                 case 'i':
 106                         flags |= IFLAG;
 107                         break;
 108                 case 'K':
 109                         flags |= KFLAG;
 110                         break;
 111                 case 'm':
 112                         flags |= MFLAG;
 113                         break;
 114                 case 'n':
 115                         flags |= NFLAG;
 116                         break;
 117                 case 'p':
 118                         flags |= PFLAG;
 119                         break;
 120                 case 'r':
 121                         flags |= RFLAG;
 122                         break;
 123                 case 's':
 124                 case 'o':
 125                         flags |= SFLAG;
 126                         break;
 127                 case 'U':
 128                         flags |= UFLAG;
 129                         break;
 130                 case 'v':
 131                         flags |= VFLAG;
 132                         break;
 133                 case '?':
 134                 default:
 135                         usage();
 136                 }
 137
 138         argc -= optind;
 139         argv += optind;
 140
 141         if (argc)
 142                 usage();
 143
 144         if (!flags)
 145                 flags |= SFLAG;
 146
 147         print_uname(flags);
 148         exit(0);
 149 }
 150
 151 #define CHECK_ENV(opt,var)                              \
 152 do {                                                    \
 153         if ((var = getenv("UNAME_" opt)) == NULL) {     \
 154                 get_##var = native_##var;               \
 155         } else {                                        \
 156                 get_##var = (get_t)NULL;                \
 157         }                                               \
 158 } while (0)
 159
 160 static void
 161 setup_get(void)
 162 {
 163         CHECK_ENV("s", sysname);
 164         CHECK_ENV("n", hostname);
 165         CHECK_ENV("r", release);
 166         CHECK_ENV("v", version);
 167         CHECK_ENV("m", platform);
 168         CHECK_ENV("p", arch);
 169         CHECK_ENV("i", ident);
 170         CHECK_ENV("K", kernvers);
 171         CHECK_ENV("U", uservers);
 172 }
 173
 174 #define PRINT_FLAG(flags,flag,var)              \
 175         if ((flags & flag) == flag) {           \
 176                 if (space)                      \
 177                         printf(" ");            \
 178                 else                            \
 179                         space++;                \
 180                 if (get_##var != NULL)          \
 181                         (*get_##var)();         \
 182                 printf("%s", var);              \
 183         }
 184
 185 static void
 186 print_uname(u_int flags)
 187 {
 188         PRINT_FLAG(flags, SFLAG, sysname);
 189         PRINT_FLAG(flags, NFLAG, hostname);
 190         PRINT_FLAG(flags, RFLAG, release);
 191         PRINT_FLAG(flags, VFLAG, version);
 192         PRINT_FLAG(flags, MFLAG, platform);
 193         PRINT_FLAG(flags, PFLAG, arch);
 194         PRINT_FLAG(flags, IFLAG, ident);
 195         PRINT_FLAG(flags, KFLAG, kernvers);
 196         PRINT_FLAG(flags, UFLAG, uservers);
 197         printf("\n");
 198 }
 199
 200 #define NATIVE_SYSCTL2_GET(var,mib0,mib1)       \
 201 static void                                     \
 202 native_##var(void)                              \
 203 {                                               \
 204         int mib[] = { (mib0), (mib1) };         \
 205         size_t len;                             \
 206         static char buf[1024];                  \
 207         char **varp = &(var);                   \
 208                                                 \
 209         len = sizeof buf;                       \
 210         if (sysctl(mib, sizeof mib / sizeof mib[0],     \
 211            &buf, &len, NULL, 0) == -1)          \
 212                 err(1, "sysctl");
 213
 214 #define NATIVE_SYSCTLNAME_GET(var,name)         \
 215 static void                                     \
 216 native_##var(void)                              \
 217 {                                               \
 218         size_t len;                             \
 219         static char buf[1024];                  \
 220         char **varp = &(var);                   \
 221                                                 \
 222         len = sizeof buf;                       \
 223         if (sysctlbyname(name, &buf, &len, NULL,\
 224             0) == -1)                           \
 225                 err(1, "sysctlbyname");
 226
 227 #define NATIVE_SET                              \
 228         *varp = buf;                            \
 229         return;                                 \
 230 }       struct __hack
 231
 232 #define NATIVE_BUFFER   (buf)
 233 #define NATIVE_LENGTH   (len)
 234
 235 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
 236 } NATIVE_SET;
 237
 238 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
 239 } NATIVE_SET;
 240
 241 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
 242 } NATIVE_SET;
 243
 244 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
 245         size_t n;
 246         char *p;
 247
 248         p = NATIVE_BUFFER;
 249         n = NATIVE_LENGTH;
 250         for (; n--; ++p)
 251                 if (*p == '\n' || *p == '\t')
 252                         *p = ' ';
 253 } NATIVE_SET;
 254
 255 NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
 256 } NATIVE_SET;
 257
 258 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
 259 } NATIVE_SET;
 260
 261 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
 262 } NATIVE_SET;
 263
 264 static void
 265 native_uservers(void)
 266 {
 267         static char buf[128];
 268
 269         snprintf(buf, sizeof(buf), "%d", __FreeBSD_version);
 270         uservers = buf;
 271 }
 272
 273 static void
 274 native_kernvers(void)
 275 {
 276         static char buf[128];
 277
 278         snprintf(buf, sizeof(buf), "%d", getosreldate());
 279         kernvers = buf;
 280 }
 281
 282 static void
 283 usage(void)
 284 {
 285         fprintf(stderr, "usage: uname [-aiKmnoprsUv]\n");
 286         exit(1);
 287 }