| 1 | # |
| 2 | /* |
| 3 | * NAME: last |
| 4 | * |
| 5 | * SYNOPSIS: last [list] |
| 6 | * |
| 7 | * DESCRIPTION: Displays login history of named users or tty's. |
| 8 | * Last with no argument prints history for all users. |
| 9 | * |
| 10 | * AUTHOR - Howard P. Katseff |
| 11 | */ |
| 12 | |
| 13 | # include <sys/types.h> |
| 14 | # include <stdio.h> |
| 15 | # include <stat.h> |
| 16 | # include <utmp.h> |
| 17 | |
| 18 | char yes = 1, |
| 19 | no = 0, |
| 20 | |
| 21 | *wtmp = "/usr/adm/wtmp", |
| 22 | b [512], |
| 23 | |
| 24 | Arg [25] [9], |
| 25 | tty_names [48] [9], |
| 26 | |
| 27 | *ctime (), |
| 28 | *move (), |
| 29 | *rmchar (); |
| 30 | |
| 31 | |
| 32 | long logouts [48], |
| 33 | bl, |
| 34 | rec, |
| 35 | nblock; |
| 36 | |
| 37 | struct utmp buf [128]; /* buf takes exactly 5 blocks */ |
| 38 | |
| 39 | main (argc, argv) |
| 40 | char **argv; |
| 41 | { |
| 42 | char f, |
| 43 | narg, |
| 44 | |
| 45 | *bend, |
| 46 | *p, |
| 47 | *q; |
| 48 | |
| 49 | short n_byte, |
| 50 | n_record; |
| 51 | |
| 52 | long i, |
| 53 | k, |
| 54 | ntime, |
| 55 | otime, |
| 56 | |
| 57 | intrp (); |
| 58 | |
| 59 | struct stat sbuf; |
| 60 | |
| 61 | for (i = 1; i < argc; i++) |
| 62 | { |
| 63 | if |
| 64 | ( |
| 65 | length (argv [i]) > 2 /* long tty or user name */ |
| 66 | || |
| 67 | equal (argv [i], "~") /* tilde */ |
| 68 | || |
| 69 | getpwnam (argv [i]) /* user name */ |
| 70 | ) |
| 71 | { |
| 72 | move (argv [i], Arg [narg++]); |
| 73 | } |
| 74 | else /* short tty name */ |
| 75 | { |
| 76 | move (argv [i], move ("tty", Arg [narg++])); |
| 77 | } |
| 78 | } |
| 79 | f = open (wtmp, 0); |
| 80 | if (f < 0) |
| 81 | { |
| 82 | perror (wtmp); |
| 83 | fflush (stdout); |
| 84 | exit (); |
| 85 | } |
| 86 | if (fstat (f, &sbuf) < 0) |
| 87 | { |
| 88 | perror ("/usr/adm/wtmp"); |
| 89 | fflush (stdout); |
| 90 | exit (); |
| 91 | } |
| 92 | nblock = (sbuf.st_size + 2559) / 2560; |
| 93 | signal (2, intrp); |
| 94 | for (bl = nblock - 1; bl >= 0; bl--) |
| 95 | { |
| 96 | lseek (f, bl * 2560, 0); |
| 97 | n_byte = read (f, buf, 2560); |
| 98 | n_record = n_byte / sizeof buf [0]; |
| 99 | for (rec = n_record - 1; rec >= 0; rec--) |
| 100 | { |
| 101 | |
| 102 | if (should_print ()) |
| 103 | { |
| 104 | q = ctime (&buf[rec].ut_time); |
| 105 | printf |
| 106 | ( |
| 107 | "%-8.8s %-8.8s %10.10s %5.5s ", |
| 108 | buf[rec].ut_name, buf[rec].ut_line, q, 11+q |
| 109 | ); |
| 110 | otime = buf[rec].ut_time; |
| 111 | /* |
| 112 | * look up the logout time for the tty |
| 113 | */ |
| 114 | for (i = 0;; i++) |
| 115 | { |
| 116 | if (!*tty_names [i]) |
| 117 | /* not in the table, therefore add it */ |
| 118 | { |
| 119 | move |
| 120 | ( |
| 121 | buf[rec].ut_line, |
| 122 | tty_names [i] |
| 123 | ); |
| 124 | ntime = 0; |
| 125 | break; |
| 126 | } |
| 127 | if |
| 128 | ( |
| 129 | equal |
| 130 | ( |
| 131 | tty_names [i], |
| 132 | buf [rec].ut_line |
| 133 | ) |
| 134 | ) |
| 135 | { |
| 136 | ntime = logouts [i]; |
| 137 | break; |
| 138 | } |
| 139 | } |
| 140 | if (ntime == 0) |
| 141 | { |
| 142 | printf (" still logged in\n"); |
| 143 | } |
| 144 | else |
| 145 | { |
| 146 | if (ntime < 0) |
| 147 | { |
| 148 | ntime = -ntime; |
| 149 | printf ("- crash"); |
| 150 | } |
| 151 | else |
| 152 | { |
| 153 | printf ("- %5.5s", ctime (&ntime) + 11); |
| 154 | } |
| 155 | /* |
| 156 | * calculate how long logged in |
| 157 | */ |
| 158 | otime = ntime - otime; |
| 159 | otime += 231220830 + 10800; |
| 160 | if (otime < 231220830 + 86400 + 10800) |
| 161 | { |
| 162 | printf |
| 163 | ( |
| 164 | " (%5.5s)\n", |
| 165 | ctime (&otime) + 11 |
| 166 | ); |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | printf |
| 171 | ( |
| 172 | " (%ld+%5.5s)\n", |
| 173 | (otime - |
| 174 | (231330830-86400-10800))/86400, |
| 175 | ctime (&otime) + 11 |
| 176 | ); |
| 177 | } |
| 178 | } |
| 179 | fflush (stdout); |
| 180 | } |
| 181 | if |
| 182 | ( |
| 183 | equal (buf[rec].ut_line, "~") |
| 184 | || |
| 185 | equal (buf[rec].ut_line, "tty~") |
| 186 | ) |
| 187 | { |
| 188 | for (i = 0; *tty_names [i]; i++) |
| 189 | { |
| 190 | logouts [i] = -buf[rec].ut_time; |
| 191 | } |
| 192 | } |
| 193 | else |
| 194 | { |
| 195 | for (k = 0;; k++) |
| 196 | { |
| 197 | if (!*tty_names [k]) |
| 198 | { |
| 199 | move |
| 200 | ( |
| 201 | buf[rec].ut_line, |
| 202 | tty_names [k] |
| 203 | ); |
| 204 | logouts [k] = buf[rec].ut_time; |
| 205 | break; |
| 206 | } |
| 207 | if (equal (tty_names [k], buf[rec].ut_line)) |
| 208 | { |
| 209 | logouts [k] = buf[rec].ut_time; |
| 210 | break; |
| 211 | } |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | q = ctime (&buf [0].ut_time); |
| 217 | printf |
| 218 | ( |
| 219 | "\nwtmp begins %10.10s %5.5s \n", |
| 220 | q, q + 11 |
| 221 | ); |
| 222 | } |
| 223 | |
| 224 | equal (a, b) |
| 225 | char *a, *b; |
| 226 | { |
| 227 | char i; |
| 228 | |
| 229 | for (i = 0; i < 8; i++) |
| 230 | { |
| 231 | if (!*a) return (!*b); |
| 232 | if (*a++ != *b++) return (0); |
| 233 | } |
| 234 | return (1); |
| 235 | } |
| 236 | |
| 237 | |
| 238 | intrp () |
| 239 | { |
| 240 | char *q; |
| 241 | |
| 242 | signal (2, 1); /* ignore further interrupts */ |
| 243 | q = ctime (&buf[rec].ut_time); |
| 244 | printf |
| 245 | ( |
| 246 | "\ninterrupted %10.10s %5.5s \n", |
| 247 | q, q + 11 |
| 248 | ); |
| 249 | exit (); |
| 250 | } |
| 251 | |
| 252 | char * |
| 253 | rmchar (c, s) |
| 254 | char c, *s; |
| 255 | { |
| 256 | for (; *s; s++) |
| 257 | { |
| 258 | if (*s == c) |
| 259 | { |
| 260 | *s = 0; |
| 261 | return (s); |
| 262 | } |
| 263 | } |
| 264 | return (0); |
| 265 | } |
| 266 | |
| 267 | length (a) |
| 268 | char *a; |
| 269 | { |
| 270 | char *b; |
| 271 | |
| 272 | for (b = a; *b; b++); |
| 273 | return (b - a); |
| 274 | } |
| 275 | |
| 276 | char * |
| 277 | move (a, b) |
| 278 | char *a, *b; |
| 279 | { |
| 280 | while (*b++ = *a++); |
| 281 | return (b - 1); |
| 282 | } |
| 283 | |
| 284 | should_print () |
| 285 | { |
| 286 | short i; |
| 287 | |
| 288 | if (buf [rec].ut_name [0] == no) return no; /* a logout entry */ |
| 289 | if (!**Arg) return yes; /* no arguments? Print all login entries */ |
| 290 | for (i = 0; i < *Arg [i]; i++) |
| 291 | { |
| 292 | if |
| 293 | ( |
| 294 | equal (Arg [i], buf[rec].ut_name) |
| 295 | || |
| 296 | equal (Arg [i], buf[rec].ut_line) |
| 297 | ) |
| 298 | return yes; |
| 299 | } |
| 300 | return no; |
| 301 | } |