1 /* $OpenBSD: lastcomm.c,v 1.21 2015/03/15 00:41:28 millert 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/param.h> /* NODEV */ 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 <struct.h> 45 #include <unistd.h> 46 #include <utmp.h> 47 #include <pwd.h> 48 #include "pathnames.h" 49 50 time_t expand(u_int); 51 char *flagbits(int); 52 char *getdev(dev_t); 53 int requested(char *[], struct acct *); 54 void usage(void); 55 56 #define SECSPERMIN (60) 57 #define SECSPERHOUR (60 * 60) 58 59 int 60 main(int argc, char *argv[]) 61 { 62 char *p; 63 struct acct ab; 64 struct stat sb; 65 FILE *fp; 66 off_t size; 67 time_t t; 68 double delta; 69 int ch; 70 char *acctfile; 71 72 acctfile = _PATH_ACCT; 73 while ((ch = getopt(argc, argv, "f:")) != -1) 74 switch(ch) { 75 case 'f': 76 acctfile = optarg; 77 break; 78 case '?': 79 default: 80 usage(); 81 } 82 argc -= optind; 83 argv += optind; 84 85 /* Open the file. */ 86 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb)) 87 err(1, "%s", acctfile); 88 89 /* 90 * Round off to integral number of accounting records, probably 91 * not necessary, but it doesn't hurt. 92 */ 93 size = sb.st_size - sb.st_size % sizeof(struct acct); 94 95 /* Check if any records to display. */ 96 if (size < sizeof(struct acct)) 97 exit(0); 98 99 /* 100 * Seek to before the last entry in the file; use lseek(2) in case 101 * the file is bigger than a "long". 102 */ 103 size -= sizeof(struct acct); 104 if (lseek(fileno(fp), size, SEEK_SET) == -1) 105 err(1, "%s", acctfile); 106 107 for (;;) { 108 if (fread(&ab, sizeof(struct acct), 1, fp) != 1) 109 err(1, "%s", acctfile); 110 111 if (ab.ac_comm[0] == '\0') { 112 ab.ac_comm[0] = '?'; 113 ab.ac_comm[1] = '\0'; 114 } else 115 for (p = &ab.ac_comm[0]; 116 p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p) 117 if (!isprint((unsigned char)*p)) 118 *p = '?'; 119 if (!*argv || requested(argv, &ab)) 120 { 121 t = expand(ab.ac_utime) + expand(ab.ac_stime); 122 (void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s", 123 (int)fldsiz(acct, ac_comm), 124 (int)fldsiz(acct, ac_comm), 125 ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE, 126 UT_NAMESIZE, user_from_uid(ab.ac_uid, 0), 127 UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty), 128 t / (double)AHZ, ctime(&ab.ac_btime)); 129 delta = expand(ab.ac_etime) / (double)AHZ; 130 printf(" (%1.0f:%02.0f:%05.2f)\n", 131 delta / SECSPERHOUR, 132 fmod(delta, (double)SECSPERHOUR) / SECSPERMIN, 133 fmod(delta, (double)SECSPERMIN)); 134 } 135 136 if (size == 0) 137 break; 138 /* seek to previous entry */ 139 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1) 140 err(1, "%s", acctfile); 141 size -= sizeof(struct acct); 142 } 143 exit(0); 144 } 145 146 time_t 147 expand(u_int t) 148 { 149 time_t nt; 150 151 nt = t & 017777; 152 t >>= 13; 153 while (t) { 154 t--; 155 nt <<= 3; 156 } 157 return (nt); 158 } 159 160 char * 161 flagbits(int f) 162 { 163 static char flags[20] = "-"; 164 char *p; 165 166 #define BIT(flag, ch) if (f & flag) *p++ = ch 167 168 p = flags + 1; 169 BIT(ASU, 'S'); 170 BIT(AFORK, 'F'); 171 BIT(ACOMPAT, 'C'); 172 BIT(ACORE, 'D'); 173 BIT(AXSIG, 'X'); 174 *p = '\0'; 175 return (flags); 176 } 177 178 int 179 requested(char *argv[], struct acct *acp) 180 { 181 do { 182 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv)) 183 return (1); 184 if (!strcmp(getdev(acp->ac_tty), *argv)) 185 return (1); 186 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm))) 187 return (1); 188 } while (*++argv); 189 return (0); 190 } 191 192 char * 193 getdev(dev_t dev) 194 { 195 static dev_t lastdev = (dev_t)-1; 196 static char *lastname; 197 198 if (dev == NODEV) /* Special case. */ 199 return ("__"); 200 if (dev == lastdev) /* One-element cache. */ 201 return (lastname); 202 lastdev = dev; 203 if ((lastname = devname(dev, S_IFCHR)) == NULL) 204 lastname = "??"; 205 return (lastname); 206 } 207 208 void 209 usage(void) 210 { 211 (void)fprintf(stderr, 212 "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n"); 213 exit(1); 214 } 215