usr.bin/lastcomm/lastcomm.c

   1 /*      $NetBSD: lastcomm.c,v 1.20 2008/07/21 14:19:23 lukem Exp $      */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)lastcomm.c  8.2 (Berkeley) 4/29/95";
  41 #endif
  42 __RCSID("$NetBSD: lastcomm.c,v 1.20 2008/07/21 14:19:23 lukem Exp $");
  43 #endif /* not lint */
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/acct.h>
  48
  49 #include <ctype.h>
  50 #include <err.h>
  51 #include <fcntl.h>
  52 #include <math.h>
  53 #include <pwd.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <struct.h>
  58 #include <time.h>
  59 #include <tzfile.h>
  60 #include <unistd.h>
  61 #include <utmp.h>
  62 #include "pathnames.h"
  63
  64 static time_t            expand(u_int);
  65 static char             *flagbits(int);
  66 static const char       *getdev(dev_t);
  67 static int               requested(char *[], struct acct *);
  68 static void              usage(void) __dead;
  69
  70 int     main(int, char **);
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         char *p;
  76         struct acct ab;
  77         struct stat sb;
  78         FILE *fp;
  79         off_t size;
  80         time_t t;
  81         double delta;
  82         int ch;
  83         const char *acctfile = _PATH_ACCT;
  84
  85         setprogname(argv[0]);
  86
  87         while ((ch = getopt(argc, argv, "f:")) != -1)
  88                 switch((char)ch) {
  89                 case 'f':
  90                         acctfile = optarg;
  91                         break;
  92                 case '?':
  93                 default:
  94                         usage();
  95                 }
  96         argc -= optind;
  97         argv += optind;
  98
  99         /* Open the file. */
 100         if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
 101                 err(1, "%s", acctfile);
 102
 103         /*
 104          * Round off to integral number of accounting records, probably
 105          * not necessary, but it doesn't hurt.
 106          */
 107         size = sb.st_size - sb.st_size % sizeof(struct acct);
 108
 109         /* Check if any records to display. */
 110         if (size < (off_t)sizeof(struct acct))
 111                 exit(0);
 112
 113         /*
 114          * Seek to before the last entry in the file; use lseek(2) in case
 115          * the file is bigger than a "long".
 116          */
 117         size -= sizeof(struct acct);
 118         if (lseek(fileno(fp), size, SEEK_SET) == -1)
 119                 err(1, "%s", acctfile);
 120
 121         for (;;) {
 122                 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
 123                         err(1, "%s", acctfile);
 124
 125                 if (ab.ac_comm[0] == '\0') {
 126                         ab.ac_comm[0] = '?';
 127                         ab.ac_comm[1] = '\0';
 128                 } else
 129                         for (p = &ab.ac_comm[0];
 130                             p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
 131                                 if (!isprint((unsigned char)*p))
 132                                         *p = '?';
 133                 if (!*argv || requested(argv, &ab)) {
 134
 135                         t = expand(ab.ac_utime) + expand(ab.ac_stime);
 136                         (void)printf(
 137                             "%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
 138                              (int)fldsiz(acct, ac_comm),
 139                              (int)fldsiz(acct, ac_comm),
 140                              ab.ac_comm, flagbits(ab.ac_flag),
 141                              UT_NAMESIZE, UT_NAMESIZE,
 142                              user_from_uid(ab.ac_uid, 0), UT_LINESIZE,
 143                              UT_LINESIZE, getdev(ab.ac_tty),
 144                              t / (double)AHZ, ctime(&ab.ac_btime));
 145                         delta = expand(ab.ac_etime) / (double)AHZ;
 146                         printf(" (%1.0f:%02.0f:%05.2f)\n",
 147                                floor(delta / SECSPERHOUR),
 148                                floor(fmod(delta, SECSPERHOUR) / SECSPERMIN),
 149                                fmod(delta, SECSPERMIN));
 150                 }
 151                 /* are we at the beginning of the file yet? */
 152                 if (size == 0)
 153                         break;
 154                 /* seek backward over the one we read and the next to read */
 155                 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
 156                         err(1, "%s", acctfile);
 157                 /* and account for its size */
 158                 size -= sizeof(struct acct);
 159         }
 160         exit(0);
 161 }
 162
 163 static time_t
 164 expand(u_int t)
 165 {
 166         time_t nt;
 167
 168         nt = t & 017777;
 169         t >>= 13;
 170         while (t) {
 171                 t--;
 172                 nt <<= 3;
 173         }
 174         return (nt);
 175 }
 176
 177 static char *
 178 flagbits(int f)
 179 {
 180         static char flags[20] = "-";
 181         char *p;
 182
 183 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 184
 185         p = flags + 1;
 186         BIT(ASU, 'S');
 187         BIT(AFORK, 'F');
 188         BIT(ACOMPAT, 'C');
 189         BIT(ACORE, 'D');
 190         BIT(AXSIG, 'X');
 191         *p = '\0';
 192         return (flags);
 193 }
 194
 195 static int
 196 requested(char *argv[], struct acct *acp)
 197 {
 198         do {
 199                 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
 200                         return (1);
 201                 if (!strcmp(getdev(acp->ac_tty), *argv))
 202                         return (1);
 203                 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
 204                         return (1);
 205         } while (*++argv);
 206         return (0);
 207 }
 208
 209 static const char *
 210 getdev(dev_t dev)
 211 {
 212         static dev_t lastdev = (dev_t)-1;
 213         static const char *lastname;
 214
 215         if (dev == NODEV)                       /* Special case. */
 216                 return ("__");
 217         if (dev == lastdev)                     /* One-element cache. */
 218                 return (lastname);
 219         lastdev = dev;
 220         if ((lastname = devname(dev, S_IFCHR)) == NULL)
 221                 lastname = "??";
 222         return (lastname);
 223 }
 224
 225 static void
 226 usage(void)
 227 {
 228         (void)fprintf(stderr,
 229             "Usage: %s [ -f file ] [command ...] [user ...] [tty ...]\n",
 230             getprogname());
 231         exit(1);
 232 }