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
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)uname.c       8.2 (Berkeley) 5/4/95";
  46 #endif
  47
  48 #include <sys/param.h>
  49 #include <sys/sysctl.h>
  50
  51 #include <err.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55
  56 #include <osreldate.h>
  57
  58 #define MFLAG   0x01
  59 #define NFLAG   0x02
  60 #define PFLAG   0x04
  61 #define RFLAG   0x08
  62 #define SFLAG   0x10
  63 #define VFLAG   0x20
  64 #define IFLAG   0x40
  65 #define UFLAG   0x80
  66 #define KFLAG   0x100
  67 #define BFLAG   0x200
  68
  69 typedef void (*get_t)(void);
  70 static get_t get_buildid, get_ident, get_platform, get_hostname, get_arch,
  71     get_release, get_sysname, get_kernvers, get_uservers, get_version;
  72
  73 static void native_ident(void);
  74 static void native_platform(void);
  75 static void native_hostname(void);
  76 static void native_arch(void);
  77 static void native_release(void);
  78 static void native_sysname(void);
  79 static void native_version(void);
  80 static void native_kernvers(void);
  81 static void native_uservers(void);
  82 static void native_buildid(void);
  83 static void print_uname(u_int);
  84 static void setup_get(void);
  85 static void usage(void) __dead2;
  86
  87 static char *buildid, *ident, *platform, *hostname, *arch, *release, *sysname,
  88     *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, "abiKmnoprsUv")) != -1)
 101                 switch(ch) {
 102                 case 'a':
 103                         flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
 104                         break;
 105                 case 'b':
 106                         flags |= BFLAG;
 107                         break;
 108                 case 'i':
 109                         flags |= IFLAG;
 110                         break;
 111                 case 'K':
 112                         flags |= KFLAG;
 113                         break;
 114                 case 'm':
 115                         flags |= MFLAG;
 116                         break;
 117                 case 'n':
 118                         flags |= NFLAG;
 119                         break;
 120                 case 'p':
 121                         flags |= PFLAG;
 122                         break;
 123                 case 'r':
 124                         flags |= RFLAG;
 125                         break;
 126                 case 's':
 127                 case 'o':
 128                         flags |= SFLAG;
 129                         break;
 130                 case 'U':
 131                         flags |= UFLAG;
 132                         break;
 133                 case 'v':
 134                         flags |= VFLAG;
 135                         break;
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140
 141         argc -= optind;
 142         argv += optind;
 143
 144         if (argc)
 145                 usage();
 146
 147         if (!flags)
 148                 flags |= SFLAG;
 149
 150         print_uname(flags);
 151         exit(0);
 152 }
 153
 154 #define CHECK_ENV(opt,var)                              \
 155 do {                                                    \
 156         if ((var = getenv("UNAME_" opt)) == NULL) {     \
 157                 get_##var = native_##var;               \
 158         } else {                                        \
 159                 get_##var = (get_t)NULL;                \
 160         }                                               \
 161 } while (0)
 162
 163 static void
 164 setup_get(void)
 165 {
 166         CHECK_ENV("s", sysname);
 167         CHECK_ENV("n", hostname);
 168         CHECK_ENV("r", release);
 169         CHECK_ENV("v", version);
 170         CHECK_ENV("m", platform);
 171         CHECK_ENV("p", arch);
 172         CHECK_ENV("i", ident);
 173         CHECK_ENV("K", kernvers);
 174         CHECK_ENV("U", uservers);
 175         CHECK_ENV("b", buildid);
 176 }
 177
 178 #define PRINT_FLAG(flags,flag,var)              \
 179         if ((flags & flag) == flag) {           \
 180                 if (space)                      \
 181                         printf(" ");            \
 182                 else                            \
 183                         space++;                \
 184                 if (get_##var != NULL)          \
 185                         (*get_##var)();         \
 186                 printf("%s", var);              \
 187         }
 188
 189 static void
 190 print_uname(u_int flags)
 191 {
 192         PRINT_FLAG(flags, SFLAG, sysname);
 193         PRINT_FLAG(flags, NFLAG, hostname);
 194         PRINT_FLAG(flags, RFLAG, release);
 195         PRINT_FLAG(flags, VFLAG, version);
 196         PRINT_FLAG(flags, MFLAG, platform);
 197         PRINT_FLAG(flags, PFLAG, arch);
 198         PRINT_FLAG(flags, IFLAG, ident);
 199         PRINT_FLAG(flags, KFLAG, kernvers);
 200         PRINT_FLAG(flags, UFLAG, uservers);
 201         PRINT_FLAG(flags, BFLAG, buildid);
 202         printf("\n");
 203 }
 204
 205 #define NATIVE_SYSCTL2_GET(var,mib0,mib1)       \
 206 static void                                     \
 207 native_##var(void)                              \
 208 {                                               \
 209         int mib[] = { (mib0), (mib1) };         \
 210         size_t len;                             \
 211         static char buf[1024];                  \
 212         char **varp = &(var);                   \
 213                                                 \
 214         len = sizeof buf;                       \
 215         if (sysctl(mib, sizeof mib / sizeof mib[0],     \
 216            &buf, &len, NULL, 0) == -1)          \
 217                 err(1, "sysctl");
 218
 219 #define NATIVE_SYSCTLNAME_GET(var,name)         \
 220 static void                                     \
 221 native_##var(void)                              \
 222 {                                               \
 223         size_t len;                             \
 224         static char buf[1024];                  \
 225         char **varp = &(var);                   \
 226                                                 \
 227         len = sizeof buf;                       \
 228         if (sysctlbyname(name, &buf, &len, NULL,\
 229             0) == -1)                           \
 230                 err(1, "sysctlbyname");
 231
 232 #define NATIVE_SET                              \
 233         *varp = buf;                            \
 234         return;                                 \
 235 }       struct __hack
 236
 237 #define NATIVE_BUFFER   (buf)
 238 #define NATIVE_LENGTH   (len)
 239
 240 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
 241 } NATIVE_SET;
 242
 243 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
 244 } NATIVE_SET;
 245
 246 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
 247 } NATIVE_SET;
 248
 249 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
 250         size_t n;
 251         char *p;
 252
 253         p = NATIVE_BUFFER;
 254         n = NATIVE_LENGTH;
 255         for (; n--; ++p)
 256                 if (*p == '\n' || *p == '\t') {
 257                         if (n > 1)
 258                                 *p = ' ';
 259                         else
 260                                 *p = '\0';
 261                 }
 262 } NATIVE_SET;
 263
 264 NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
 265 } NATIVE_SET;
 266
 267 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
 268 } NATIVE_SET;
 269
 270 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
 271 } NATIVE_SET;
 272
 273 NATIVE_SYSCTLNAME_GET(buildid, "kern.build_id") {
 274 } NATIVE_SET;
 275
 276 static void
 277 native_uservers(void)
 278 {
 279         static char buf[128];
 280
 281         snprintf(buf, sizeof(buf), "%d", __FreeBSD_version);
 282         uservers = buf;
 283 }
 284
 285 static void
 286 native_kernvers(void)
 287 {
 288         static char buf[128];
 289
 290         snprintf(buf, sizeof(buf), "%d", getosreldate());
 291         kernvers = buf;
 292 }
 293
 294 static void
 295 usage(void)
 296 {
 297         fprintf(stderr, "usage: uname [-abiKmnoprsUv]\n");
 298         exit(1);
 299 }