lastcomm/lastcomm.c

   1 /*      $NetBSD: lastcomm.c,v 1.21 2009/04/12 13:08:31 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 1.21 2009/04/12 13:08:31 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 /* definitions from utmp.h */
  62 #define UT_NAMESIZE     8
  63 #define UT_LINESIZE     8
  64 #include "pathnames.h"
  65
  66 static time_t            expand(u_int);
  67 static char             *flagbits(int);
  68 static const char       *getdev(dev_t);
  69 static int               requested(char *[], struct acct *);
  70 static void              usage(void) __dead;
  71
  72 int     main(int, char **);
  73
  74 int
  75 main(int argc, char *argv[])
  76 {
  77         char *p;
  78         struct acct ab;
  79         struct stat sb;
  80         FILE *fp;
  81         off_t size;
  82         time_t t;
  83         double delta;
  84         int ch;
  85         const char *acctfile = _PATH_ACCT;
  86
  87         setprogname(argv[0]);
  88
  89         while ((ch = getopt(argc, argv, "f:")) != -1)
  90                 switch((char)ch) {
  91                 case 'f':
  92                         acctfile = optarg;
  93                         break;
  94                 case '?':
  95                 default:
  96                         usage();
  97                 }
  98         argc -= optind;
  99         argv += optind;
 100
 101         /* Open the file. */
 102         if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
 103                 err(1, "%s", acctfile);
 104
 105         /*
 106          * Round off to integral number of accounting records, probably
 107          * not necessary, but it doesn't hurt.
 108          */
 109         size = sb.st_size - sb.st_size % sizeof(struct acct);
 110
 111         /* Check if any records to display. */
 112         if (size < (off_t)sizeof(struct acct))
 113                 exit(0);
 114
 115         /*
 116          * Seek to before the last entry in the file; use lseek(2) in case
 117          * the file is bigger than a "long".
 118          */
 119         size -= sizeof(struct acct);
 120         if (lseek(fileno(fp), size, SEEK_SET) == -1)
 121                 err(1, "%s", acctfile);
 122
 123         for (;;) {
 124                 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
 125                         err(1, "%s", acctfile);
 126
 127                 if (ab.ac_comm[0] == '\0') {
 128                         ab.ac_comm[0] = '?';
 129                         ab.ac_comm[1] = '\0';
 130                 } else
 131                         for (p = &ab.ac_comm[0];
 132                             p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
 133                                 if (!isprint((unsigned char)*p))
 134                                         *p = '?';
 135                 if (!*argv || requested(argv, &ab)) {
 136
 137                         time_t timelong = ab.ac_btime;
 138                         t = expand(ab.ac_utime) + expand(ab.ac_stime);
 139                         (void)printf(
 140                             "%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
 141                              (int)fldsiz(acct, ac_comm),
 142                              (int)fldsiz(acct, ac_comm),
 143                              ab.ac_comm, flagbits(ab.ac_flag),
 144                              UT_NAMESIZE, UT_NAMESIZE,
 145                              user_from_uid(ab.ac_uid, 0), UT_LINESIZE,
 146                              UT_LINESIZE, getdev(ab.ac_tty),
 147                              t / (double)AHZ, ctime(&timelong));
 148                         delta = expand(ab.ac_etime) / (double)AHZ;
 149                         printf(" (%1.0f:%02.0f:%05.2f)\n",
 150                                floor(delta / SECSPERHOUR),
 151                                floor(fmod(delta, SECSPERHOUR) / SECSPERMIN),
 152                                fmod(delta, SECSPERMIN));
 153                 }
 154                 /* are we at the beginning of the file yet? */
 155                 if (size == 0)
 156                         break;
 157                 /* seek backward over the one we read and the next to read */
 158                 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
 159                         err(1, "%s", acctfile);
 160                 /* and account for its size */
 161                 size -= sizeof(struct acct);
 162         }
 163         exit(0);
 164 }
 165
 166 static time_t
 167 expand(u_int t)
 168 {
 169         time_t nt;
 170
 171         nt = t & 017777;
 172         t >>= 13;
 173         while (t) {
 174                 t--;
 175                 nt <<= 3;
 176         }
 177         return (nt);
 178 }
 179
 180 static char *
 181 flagbits(int f)
 182 {
 183         static char flags[20] = "-";
 184         char *p;
 185
 186 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 187
 188         p = flags + 1;
 189         BIT(ASU, 'S');
 190         BIT(AFORK, 'F');
 191         BIT(ACOMPAT, 'C');
 192         BIT(ACORE, 'D');
 193         BIT(AXSIG, 'X');
 194         *p = '\0';
 195         return (flags);
 196 }
 197
 198 static int
 199 requested(char *argv[], struct acct *acp)
 200 {
 201         do {
 202                 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
 203                         return (1);
 204                 if (!strcmp(getdev(acp->ac_tty), *argv))
 205                         return (1);
 206                 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
 207                         return (1);
 208         } while (*++argv);
 209         return (0);
 210 }
 211
 212 static const char *
 213 getdev(dev_t dev)
 214 {
 215         static dev_t lastdev = (dev_t)-1;
 216         static const char *lastname;
 217
 218         if (dev == NODEV)                       /* Special case. */
 219                 return ("__");
 220         if (dev == lastdev)                     /* One-element cache. */
 221                 return (lastname);
 222         lastdev = dev;
 223         if ((lastname = devname(dev, S_IFCHR)) == NULL)
 224                 lastname = "??";
 225         return (lastname);
 226 }
 227
 228 static void
 229 usage(void)
 230 {
 231         (void)fprintf(stderr,
 232             "Usage: %s [ -f file ] [command ...] [user ...] [tty ...]\n",
 233             getprogname());
 234         exit(1);
 235 }