Annotation of src/usr.bin/lastcomm/lastcomm.c, Revision 1.21
1.21 ! millert 1: /* $OpenBSD: lastcomm.c,v 1.20 2015/01/16 06:40:09 deraadt Exp $ */
1.2 deraadt 2: /* $NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1980, 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.
1.11 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
1.20 deraadt 33: #include <sys/param.h> /* NODEV */
1.1 deraadt 34: #include <sys/stat.h>
35: #include <sys/acct.h>
36:
37: #include <ctype.h>
38: #include <err.h>
39: #include <fcntl.h>
1.2 deraadt 40: #include <math.h>
1.1 deraadt 41: #include <stdio.h>
42: #include <stdlib.h>
43: #include <string.h>
44: #include <struct.h>
45: #include <unistd.h>
46: #include <utmp.h>
1.13 deraadt 47: #include <pwd.h>
1.1 deraadt 48: #include "pathnames.h"
49:
1.10 millert 50: time_t expand(u_int);
51: char *flagbits(int);
52: char *getdev(dev_t);
53: int requested(char *[], struct acct *);
54: void usage(void);
1.21 ! millert 55:
! 56: #define SECSPERMIN (60)
! 57: #define SECSPERHOUR (60 * 60)
1.1 deraadt 58:
59: int
1.12 deraadt 60: main(int argc, char *argv[])
1.1 deraadt 61: {
1.9 mpech 62: char *p;
1.1 deraadt 63: struct acct ab;
64: struct stat sb;
65: FILE *fp;
66: off_t size;
67: time_t t;
1.2 deraadt 68: double delta;
1.1 deraadt 69: int ch;
70: char *acctfile;
71:
72: acctfile = _PATH_ACCT;
1.4 millert 73: while ((ch = getopt(argc, argv, "f:")) != -1)
1.19 okan 74: switch(ch) {
1.1 deraadt 75: case 'f':
76: acctfile = optarg;
77: break;
78: case '?':
79: default:
80: usage();
81: }
82: argc -= optind;
83: argv += optind;
84:
85: /* Open the file. */
86: if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
87: err(1, "%s", acctfile);
88:
89: /*
90: * Round off to integral number of accounting records, probably
91: * not necessary, but it doesn't hurt.
92: */
93: size = sb.st_size - sb.st_size % sizeof(struct acct);
94:
95: /* Check if any records to display. */
96: if (size < sizeof(struct acct))
97: exit(0);
98:
99: /*
100: * Seek to before the last entry in the file; use lseek(2) in case
101: * the file is bigger than a "long".
102: */
103: size -= sizeof(struct acct);
104: if (lseek(fileno(fp), size, SEEK_SET) == -1)
105: err(1, "%s", acctfile);
106:
107: for (;;) {
108: if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
109: err(1, "%s", acctfile);
110:
111: if (ab.ac_comm[0] == '\0') {
112: ab.ac_comm[0] = '?';
113: ab.ac_comm[1] = '\0';
114: } else
115: for (p = &ab.ac_comm[0];
116: p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
1.18 deraadt 117: if (!isprint((unsigned char)*p))
1.1 deraadt 118: *p = '?';
1.6 flipk 119: if (!*argv || requested(argv, &ab))
120: {
121: t = expand(ab.ac_utime) + expand(ab.ac_stime);
122: (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
1.7 deraadt 123: (int)fldsiz(acct, ac_comm),
124: (int)fldsiz(acct, ac_comm),
125: ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE,
126: UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
127: UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty),
128: t / (double)AHZ, ctime(&ab.ac_btime));
1.6 flipk 129: delta = expand(ab.ac_etime) / (double)AHZ;
1.8 pvalchev 130: printf(" (%1.0f:%02.0f:%05.2f)\n",
1.7 deraadt 131: delta / SECSPERHOUR,
1.14 deraadt 132: fmod(delta, (double)SECSPERHOUR) / SECSPERMIN,
133: fmod(delta, (double)SECSPERMIN));
1.6 flipk 134: }
1.5 flipk 135:
136: if (size == 0)
137: break;
1.6 flipk 138: /* seek to previous entry */
139: if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
140: err(1, "%s", acctfile);
141: size -= sizeof(struct acct);
1.1 deraadt 142: }
143: exit(0);
144: }
145:
146: time_t
1.12 deraadt 147: expand(u_int t)
1.1 deraadt 148: {
1.9 mpech 149: time_t nt;
1.1 deraadt 150:
151: nt = t & 017777;
152: t >>= 13;
153: while (t) {
154: t--;
155: nt <<= 3;
156: }
157: return (nt);
158: }
159:
160: char *
1.12 deraadt 161: flagbits(int f)
1.1 deraadt 162: {
163: static char flags[20] = "-";
164: char *p;
165:
166: #define BIT(flag, ch) if (f & flag) *p++ = ch
167:
168: p = flags + 1;
169: BIT(ASU, 'S');
170: BIT(AFORK, 'F');
171: BIT(ACOMPAT, 'C');
172: BIT(ACORE, 'D');
173: BIT(AXSIG, 'X');
174: *p = '\0';
175: return (flags);
176: }
177:
178: int
1.12 deraadt 179: requested(char *argv[], struct acct *acp)
1.1 deraadt 180: {
181: do {
182: if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
183: return (1);
184: if (!strcmp(getdev(acp->ac_tty), *argv))
185: return (1);
186: if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
187: return (1);
188: } while (*++argv);
189: return (0);
190: }
191:
192: char *
1.12 deraadt 193: getdev(dev_t dev)
1.1 deraadt 194: {
195: static dev_t lastdev = (dev_t)-1;
196: static char *lastname;
197:
198: if (dev == NODEV) /* Special case. */
199: return ("__");
200: if (dev == lastdev) /* One-element cache. */
201: return (lastname);
202: lastdev = dev;
203: if ((lastname = devname(dev, S_IFCHR)) == NULL)
204: lastname = "??";
205: return (lastname);
206: }
207:
208: void
1.12 deraadt 209: usage(void)
1.1 deraadt 210: {
211: (void)fprintf(stderr,
1.16 jmc 212: "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n");
1.1 deraadt 213: exit(1);
214: }
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