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