1 /* $OpenBSD: lastcomm.c,v 1.9 2001/11/19 19:02:14 mpech 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1980, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 4/29/95"; 46 #endif 47 static char rcsid[] = "$OpenBSD: lastcomm.c,v 1.9 2001/11/19 19:02:14 mpech Exp $"; 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/acct.h> 53 54 #include <ctype.h> 55 #include <err.h> 56 #include <fcntl.h> 57 #include <math.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <struct.h> 62 #include <tzfile.h> 63 #include <unistd.h> 64 #include <utmp.h> 65 #include "pathnames.h" 66 67 time_t expand __P((u_int)); 68 char *flagbits __P((int)); 69 char *getdev __P((dev_t)); 70 int requested __P((char *[], struct acct *)); 71 void usage __P((void)); 72 char *user_from_uid(); 73 74 int 75 main(argc, argv) 76 int argc; 77 char *argv[]; 78 { 79 char *p; 80 struct acct ab; 81 struct stat sb; 82 FILE *fp; 83 off_t size; 84 time_t t; 85 double delta; 86 int ch; 87 char *acctfile; 88 89 acctfile = _PATH_ACCT; 90 while ((ch = getopt(argc, argv, "f:")) != -1) 91 switch((char)ch) { 92 case 'f': 93 acctfile = optarg; 94 break; 95 case '?': 96 default: 97 usage(); 98 } 99 argc -= optind; 100 argv += optind; 101 102 /* Open the file. */ 103 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb)) 104 err(1, "%s", acctfile); 105 106 /* 107 * Round off to integral number of accounting records, probably 108 * not necessary, but it doesn't hurt. 109 */ 110 size = sb.st_size - sb.st_size % sizeof(struct acct); 111 112 /* Check if any records to display. */ 113 if (size < sizeof(struct acct)) 114 exit(0); 115 116 /* 117 * Seek to before the last entry in the file; use lseek(2) in case 118 * the file is bigger than a "long". 119 */ 120 size -= sizeof(struct acct); 121 if (lseek(fileno(fp), size, SEEK_SET) == -1) 122 err(1, "%s", acctfile); 123 124 for (;;) { 125 if (fread(&ab, sizeof(struct acct), 1, fp) != 1) 126 err(1, "%s", acctfile); 127 128 if (ab.ac_comm[0] == '\0') { 129 ab.ac_comm[0] = '?'; 130 ab.ac_comm[1] = '\0'; 131 } else 132 for (p = &ab.ac_comm[0]; 133 p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p) 134 if (!isprint(*p)) 135 *p = '?'; 136 if (!*argv || requested(argv, &ab)) 137 { 138 t = expand(ab.ac_utime) + expand(ab.ac_stime); 139 (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s", 140 (int)fldsiz(acct, ac_comm), 141 (int)fldsiz(acct, ac_comm), 142 ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE, 143 UT_NAMESIZE, user_from_uid(ab.ac_uid, 0), 144 UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty), 145 t / (double)AHZ, ctime(&ab.ac_btime)); 146 delta = expand(ab.ac_etime) / (double)AHZ; 147 printf(" (%1.0f:%02.0f:%05.2f)\n", 148 delta / SECSPERHOUR, 149 fmod(delta, SECSPERHOUR) / SECSPERMIN, 150 fmod(delta, SECSPERMIN)); 151 } 152 153 if (size == 0) 154 break; 155 /* seek to previous entry */ 156 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1) 157 err(1, "%s", acctfile); 158 size -= sizeof(struct acct); 159 } 160 exit(0); 161 } 162 163 time_t 164 expand(t) 165 u_int t; 166 { 167 time_t nt; 168 169 nt = t & 017777; 170 t >>= 13; 171 while (t) { 172 t--; 173 nt <<= 3; 174 } 175 return (nt); 176 } 177 178 char * 179 flagbits(f) 180 int f; 181 { 182 static char flags[20] = "-"; 183 char *p; 184 185 #define BIT(flag, ch) if (f & flag) *p++ = ch 186 187 p = flags + 1; 188 BIT(ASU, 'S'); 189 BIT(AFORK, 'F'); 190 BIT(ACOMPAT, 'C'); 191 BIT(ACORE, 'D'); 192 BIT(AXSIG, 'X'); 193 *p = '\0'; 194 return (flags); 195 } 196 197 int 198 requested(argv, acp) 199 char *argv[]; 200 struct acct *acp; 201 { 202 do { 203 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv)) 204 return (1); 205 if (!strcmp(getdev(acp->ac_tty), *argv)) 206 return (1); 207 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm))) 208 return (1); 209 } while (*++argv); 210 return (0); 211 } 212 213 char * 214 getdev(dev) 215 dev_t dev; 216 { 217 static dev_t lastdev = (dev_t)-1; 218 static char *lastname; 219 220 if (dev == NODEV) /* Special case. */ 221 return ("__"); 222 if (dev == lastdev) /* One-element cache. */ 223 return (lastname); 224 lastdev = dev; 225 if ((lastname = devname(dev, S_IFCHR)) == NULL) 226 lastname = "??"; 227 return (lastname); 228 } 229 230 void 231 usage() 232 { 233 (void)fprintf(stderr, 234 "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n"); 235 exit(1); 236 } 237