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 49time_t expand(u_int); 50char *flagbits(int); 51char *getdev(dev_t); 52int requested(char *[], struct acct *); 53void usage(void); 54 55#define SECSPERMIN (60) 56#define SECSPERHOUR (60 * 60) 57 58int 59main(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 150time_t 151expand(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 164char * 165flagbits(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 186int 187requested(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 200char * 201getdev(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 216void 217usage(void) 218{ 219 (void)fprintf(stderr, 220 "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n"); 221 exit(1); 222} 223