1 /* $OpenBSD: lastcomm.c,v 1.36 2024/02/25 00:07:13 deraadt Exp $ */
2 /* $NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $ */
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.
16 * 3. Neither the name of the University nor the names of its contributors
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
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <sys/acct.h>
36
37 #include <ctype.h>
38 #include <err.h>
39 #include <fcntl.h>
40 #include <math.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <utmp.h>
46 #include <pwd.h>
47 #include "pathnames.h"
48
49 time_t expand(u_int);
50 char *flagbits(int);
51 char *getdev(dev_t);
52 int requested(char *[], struct acct *);
53 void usage(void);
54
55 #define SECSPERMIN (60)
56 #define SECSPERHOUR (60 * 60)
57
58 int
main(int argc,char * argv[])59 main(int argc, char *argv[])
60 {
61 char *p;
62 struct acct ab;
63 struct stat sb;
64 FILE *fp;
65 off_t size;
66 time_t t;
67 double delta;
68 int ch;
69 char *acctfile;
70
71 if (pledge("stdio rpath getpw", NULL) == -1)
72 err(1, "pledge");
73
74 acctfile = _PATH_ACCT;
75 while ((ch = getopt(argc, argv, "f:")) != -1)
76 switch(ch) {
77 case 'f':
78 acctfile = optarg;
79 break;
80 default:
81 usage();
82 }
83 argc -= optind;
84 argv += optind;
85
86 /* Open the file. */
87 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
88 err(1, "%s", acctfile);
89
90 /*
91 * Round off to integral number of accounting records, probably
92 * not necessary, but it doesn't hurt.
93 */
94 size = sb.st_size - sb.st_size % sizeof(struct acct);
95
96 /* Check if any records to display. */
97 if (size < sizeof(struct acct))
98 exit(0);
99
100 /*
101 * Seek to before the last entry in the file; use lseek(2) in case
102 * the file is bigger than a "long".
103 */
104 size -= sizeof(struct acct);
105 if (lseek(fileno(fp), size, SEEK_SET) == -1)
106 err(1, "%s", acctfile);
107
108 for (;;) {
109 char commpid[sizeof(ab.ac_comm) + 13];
110
111 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
112 err(1, "%s", acctfile);
113
114 if (ab.ac_comm[0] == '\0') {
115 ab.ac_comm[0] = '?';
116 ab.ac_comm[1] = '\0';
117 } else
118 for (p = &ab.ac_comm[0];
119 p < &ab.ac_comm[sizeof ab.ac_comm] && *p; ++p)
120 if (!isprint((unsigned char)*p))
121 *p = '?';
122 snprintf(commpid, sizeof(commpid), "%s[%d]",
123 ab.ac_comm, ab.ac_pid);
124 if (!*argv || requested(argv, &ab)) {
125 t = expand(ab.ac_utime) + expand(ab.ac_stime);
126 (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
127 (int)sizeof commpid,
128 (int)sizeof commpid,
129 commpid, flagbits(ab.ac_flag), UT_NAMESIZE,
130 UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
131 UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty),
132 t / (double)AHZ, ctime(&ab.ac_btime));
133 delta = expand(ab.ac_etime) / (double)AHZ;
134 printf(" (%1.0f:%02.0f:%05.2f)\n",
135 delta / SECSPERHOUR,
136 fmod(delta, (double)SECSPERHOUR) / SECSPERMIN,
137 fmod(delta, (double)SECSPERMIN));
138 }
139
140 if (size == 0)
141 break;
142 /* seek to previous entry */
143 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
144 err(1, "%s", acctfile);
145 size -= sizeof(struct acct);
146 }
147 exit(0);
148 }
149
150 time_t
expand(u_int t)151 expand(u_int t)
152 {
153 time_t nt;
154
155 nt = t & 017777;
156 t >>= 13;
157 while (t) {
158 t--;
159 nt <<= 3;
160 }
161 return (nt);
162 }
163
164 char *
flagbits(int f)165 flagbits(int f)
166 {
167 static char flags[20] = "-";
168 char *p;
169
170 #define BIT(flag, ch) if (f & flag) *p++ = ch
171
172 p = flags + 1;
173 BIT(AFORK, 'F');
174 BIT(AMAP, 'M');
175 BIT(ACORE, 'D');
176 BIT(AXSIG, 'X');
177 BIT(APLEDGE, 'P');
178 BIT(ATRAP, 'T');
179 BIT(AUNVEIL, 'U');
180 BIT(APINSYS, 'S');
181 BIT(ABTCFI, 'B');
182 *p = '\0';
183 return (flags);
184 }
185
186 int
requested(char * argv[],struct acct * acp)187 requested(char *argv[], struct acct *acp)
188 {
189 do {
190 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
191 return (1);
192 if (!strcmp(getdev(acp->ac_tty), *argv))
193 return (1);
194 if (!strncmp(acp->ac_comm, *argv, sizeof acp->ac_comm))
195 return (1);
196 } while (*++argv);
197 return (0);
198 }
199
200 char *
getdev(dev_t dev)201 getdev(dev_t dev)
202 {
203 static dev_t lastdev = (dev_t)-1;
204 static char *lastname;
205
206 if (dev == -1) /* Special case. */
207 return ("__");
208 if (dev == lastdev) /* One-element cache. */
209 return (lastname);
210 lastdev = dev;
211 if ((lastname = devname(dev, S_IFCHR)) == NULL)
212 lastname = "??";
213 return (lastname);
214 }
215
216 void
usage(void)217 usage(void)
218 {
219 (void)fprintf(stderr,
220 "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n");
221 exit(1);
222 }
223