1 /* $OpenBSD: lastcomm.c,v 1.30 2021/12/13 16:37:37 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 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 case '?': 81 default: 82 usage(); 83 } 84 argc -= optind; 85 argv += optind; 86 87 /* Open the file. */ 88 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb)) 89 err(1, "%s", acctfile); 90 91 /* 92 * Round off to integral number of accounting records, probably 93 * not necessary, but it doesn't hurt. 94 */ 95 size = sb.st_size - sb.st_size % sizeof(struct acct); 96 97 /* Check if any records to display. */ 98 if (size < sizeof(struct acct)) 99 exit(0); 100 101 /* 102 * Seek to before the last entry in the file; use lseek(2) in case 103 * the file is bigger than a "long". 104 */ 105 size -= sizeof(struct acct); 106 if (lseek(fileno(fp), size, SEEK_SET) == -1) 107 err(1, "%s", acctfile); 108 109 for (;;) { 110 if (fread(&ab, sizeof(struct acct), 1, fp) != 1) 111 err(1, "%s", acctfile); 112 113 if (ab.ac_comm[0] == '\0') { 114 ab.ac_comm[0] = '?'; 115 ab.ac_comm[1] = '\0'; 116 } else 117 for (p = &ab.ac_comm[0]; 118 p < &ab.ac_comm[sizeof ab.ac_comm] && *p; ++p) 119 if (!isprint((unsigned char)*p)) 120 *p = '?'; 121 if (!*argv || requested(argv, &ab)) { 122 t = expand(ab.ac_utime) + expand(ab.ac_stime); 123 (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s", 124 (int)sizeof ab.ac_comm, 125 (int)sizeof ab.ac_comm, 126 ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE, 127 UT_NAMESIZE, user_from_uid(ab.ac_uid, 0), 128 UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty), 129 t / (double)AHZ, ctime(&ab.ac_btime)); 130 delta = expand(ab.ac_etime) / (double)AHZ; 131 printf(" (%1.0f:%02.0f:%05.2f)\n", 132 delta / SECSPERHOUR, 133 fmod(delta, (double)SECSPERHOUR) / SECSPERMIN, 134 fmod(delta, (double)SECSPERMIN)); 135 } 136 137 if (size == 0) 138 break; 139 /* seek to previous entry */ 140 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1) 141 err(1, "%s", acctfile); 142 size -= sizeof(struct acct); 143 } 144 exit(0); 145 } 146 147 time_t 148 expand(u_int t) 149 { 150 time_t nt; 151 152 nt = t & 017777; 153 t >>= 13; 154 while (t) { 155 t--; 156 nt <<= 3; 157 } 158 return (nt); 159 } 160 161 char * 162 flagbits(int f) 163 { 164 static char flags[20] = "-"; 165 char *p; 166 167 #define BIT(flag, ch) if (f & flag) *p++ = ch 168 169 p = flags + 1; 170 BIT(AFORK, 'F'); 171 BIT(AMAP, 'M'); 172 BIT(ACORE, 'D'); 173 BIT(AXSIG, 'X'); 174 BIT(APLEDGE, 'P'); 175 BIT(ATRAP, 'T'); 176 BIT(AUNVEIL, 'U'); 177 *p = '\0'; 178 return (flags); 179 } 180 181 int 182 requested(char *argv[], struct acct *acp) 183 { 184 do { 185 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv)) 186 return (1); 187 if (!strcmp(getdev(acp->ac_tty), *argv)) 188 return (1); 189 if (!strncmp(acp->ac_comm, *argv, sizeof acp->ac_comm)) 190 return (1); 191 } while (*++argv); 192 return (0); 193 } 194 195 char * 196 getdev(dev_t dev) 197 { 198 static dev_t lastdev = (dev_t)-1; 199 static char *lastname; 200 201 if (dev == -1) /* Special case. */ 202 return ("__"); 203 if (dev == lastdev) /* One-element cache. */ 204 return (lastname); 205 lastdev = dev; 206 if ((lastname = devname(dev, S_IFCHR)) == NULL) 207 lastname = "??"; 208 return (lastname); 209 } 210 211 void 212 usage(void) 213 { 214 (void)fprintf(stderr, 215 "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n"); 216 exit(1); 217 } 218