Annotation of src/usr.bin/lastcomm/lastcomm.c, Revision 1.20
1.20 ! deraadt 1: /* $OpenBSD: lastcomm.c,v 1.19 2013/11/27 13:32:02 okan 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>
1.2 deraadt 45: #include <tzfile.h>
1.1 deraadt 46: #include <unistd.h>
47: #include <utmp.h>
1.13 deraadt 48: #include <pwd.h>
1.1 deraadt 49: #include "pathnames.h"
50:
1.10 millert 51: time_t expand(u_int);
52: char *flagbits(int);
53: char *getdev(dev_t);
54: int requested(char *[], struct acct *);
55: void usage(void);
1.1 deraadt 56:
57: int
1.12 deraadt 58: main(int argc, char *argv[])
1.1 deraadt 59: {
1.9 mpech 60: char *p;
1.1 deraadt 61: struct acct ab;
62: struct stat sb;
63: FILE *fp;
64: off_t size;
65: time_t t;
1.2 deraadt 66: double delta;
1.1 deraadt 67: int ch;
68: char *acctfile;
69:
70: acctfile = _PATH_ACCT;
1.4 millert 71: while ((ch = getopt(argc, argv, "f:")) != -1)
1.19 okan 72: switch(ch) {
1.1 deraadt 73: case 'f':
74: acctfile = optarg;
75: break;
76: case '?':
77: default:
78: usage();
79: }
80: argc -= optind;
81: argv += optind;
82:
83: /* Open the file. */
84: if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
85: err(1, "%s", acctfile);
86:
87: /*
88: * Round off to integral number of accounting records, probably
89: * not necessary, but it doesn't hurt.
90: */
91: size = sb.st_size - sb.st_size % sizeof(struct acct);
92:
93: /* Check if any records to display. */
94: if (size < sizeof(struct acct))
95: exit(0);
96:
97: /*
98: * Seek to before the last entry in the file; use lseek(2) in case
99: * the file is bigger than a "long".
100: */
101: size -= sizeof(struct acct);
102: if (lseek(fileno(fp), size, SEEK_SET) == -1)
103: err(1, "%s", acctfile);
104:
105: for (;;) {
106: if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
107: err(1, "%s", acctfile);
108:
109: if (ab.ac_comm[0] == '\0') {
110: ab.ac_comm[0] = '?';
111: ab.ac_comm[1] = '\0';
112: } else
113: for (p = &ab.ac_comm[0];
114: p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
1.18 deraadt 115: if (!isprint((unsigned char)*p))
1.1 deraadt 116: *p = '?';
1.6 flipk 117: if (!*argv || requested(argv, &ab))
118: {
119: t = expand(ab.ac_utime) + expand(ab.ac_stime);
120: (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
1.7 deraadt 121: (int)fldsiz(acct, ac_comm),
122: (int)fldsiz(acct, ac_comm),
123: ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE,
124: UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
125: UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty),
126: t / (double)AHZ, ctime(&ab.ac_btime));
1.6 flipk 127: delta = expand(ab.ac_etime) / (double)AHZ;
1.8 pvalchev 128: printf(" (%1.0f:%02.0f:%05.2f)\n",
1.7 deraadt 129: delta / SECSPERHOUR,
1.14 deraadt 130: fmod(delta, (double)SECSPERHOUR) / SECSPERMIN,
131: fmod(delta, (double)SECSPERMIN));
1.6 flipk 132: }
1.5 flipk 133:
134: if (size == 0)
135: break;
1.6 flipk 136: /* seek to previous entry */
137: if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
138: err(1, "%s", acctfile);
139: size -= sizeof(struct acct);
1.1 deraadt 140: }
141: exit(0);
142: }
143:
144: time_t
1.12 deraadt 145: expand(u_int t)
1.1 deraadt 146: {
1.9 mpech 147: time_t nt;
1.1 deraadt 148:
149: nt = t & 017777;
150: t >>= 13;
151: while (t) {
152: t--;
153: nt <<= 3;
154: }
155: return (nt);
156: }
157:
158: char *
1.12 deraadt 159: flagbits(int f)
1.1 deraadt 160: {
161: static char flags[20] = "-";
162: char *p;
163:
164: #define BIT(flag, ch) if (f & flag) *p++ = ch
165:
166: p = flags + 1;
167: BIT(ASU, 'S');
168: BIT(AFORK, 'F');
169: BIT(ACOMPAT, 'C');
170: BIT(ACORE, 'D');
171: BIT(AXSIG, 'X');
172: *p = '\0';
173: return (flags);
174: }
175:
176: int
1.12 deraadt 177: requested(char *argv[], struct acct *acp)
1.1 deraadt 178: {
179: do {
180: if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
181: return (1);
182: if (!strcmp(getdev(acp->ac_tty), *argv))
183: return (1);
184: if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
185: return (1);
186: } while (*++argv);
187: return (0);
188: }
189:
190: char *
1.12 deraadt 191: getdev(dev_t dev)
1.1 deraadt 192: {
193: static dev_t lastdev = (dev_t)-1;
194: static char *lastname;
195:
196: if (dev == NODEV) /* Special case. */
197: return ("__");
198: if (dev == lastdev) /* One-element cache. */
199: return (lastname);
200: lastdev = dev;
201: if ((lastname = devname(dev, S_IFCHR)) == NULL)
202: lastname = "??";
203: return (lastname);
204: }
205:
206: void
1.12 deraadt 207: usage(void)
1.1 deraadt 208: {
209: (void)fprintf(stderr,
1.16 jmc 210: "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n");
1.1 deraadt 211: exit(1);
212: }
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