1 /* $NetBSD: want.c,v 1.17 2012/03/15 03:04:05 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 static struct utmp *buf; 32 static time_t seentime; 33 34 static void onintr(int); 35 static int want(struct utmp *, int); 36 static const char *gethost(struct utmp *, const char *, int); 37 38 static const char * 39 /*ARGSUSED*/ 40 gethost(struct utmp *ut, const char *host, int numeric) 41 { 42 #if HAS_UT_SS == 0 43 return numeric ? "" : host; 44 #else 45 if (numeric) { 46 static char hbuf[512]; 47 hbuf[0] = '\0'; 48 (void)sockaddr_snprintf(hbuf, sizeof(hbuf), "%a", 49 (struct sockaddr *)&ut->ut_ss); 50 return hbuf; 51 } else 52 return host; 53 #endif 54 } 55 56 #define NULTERM(what) \ 57 if (check ## what) \ 58 (void)strlcpy(what ## p = what ## buf, bp->ut_ ## what, \ 59 sizeof(what ## buf)); \ 60 else \ 61 what ## p = bp->ut_ ## what 62 63 /* 64 * wtmp -- 65 * read through the wtmp file 66 */ 67 static void 68 wtmp(const char *file, int namesz, int linesz, int hostsz, int numeric) 69 { 70 struct utmp *bp; /* current structure */ 71 TTY *T; /* tty list entry */ 72 struct stat stb; /* stat of file for sz */ 73 off_t offset; 74 int wfd; 75 char *ct; 76 const char *crmsg; 77 size_t len = sizeof(*buf) * MAXUTMP; 78 char namebuf[sizeof(bp->ut_name) + 1], *namep; 79 char linebuf[sizeof(bp->ut_line) + 1], *linep; 80 char hostbuf[sizeof(bp->ut_host) + 1], *hostp; 81 int checkname = namesz > (int)sizeof(bp->ut_name); 82 int checkline = linesz > (int)sizeof(bp->ut_line); 83 int checkhost = hostsz > (int)sizeof(bp->ut_host); 84 85 if ((buf = malloc(len)) == NULL) 86 err(EXIT_FAILURE, "Cannot allocate utmp buffer"); 87 88 crmsg = NULL; 89 90 if (!strcmp(file, "-")) { 91 wfd = STDIN_FILENO; 92 file = "<stdin>"; 93 } else if ((wfd = open(file, O_RDONLY, 0)) < 0) { 94 err(EXIT_FAILURE, "%s", file); 95 } 96 97 if (lseek(wfd, 0, SEEK_CUR) < 0) { 98 const char *dir; 99 char *tfile; 100 int tempfd; 101 ssize_t tlen; 102 103 if (ESPIPE != errno) { 104 err(EXIT_FAILURE, "lseek"); 105 } 106 dir = getenv("TMPDIR"); 107 if (asprintf(&tfile, "%s/last.XXXXXX", dir ? dir : _PATH_TMP) == -1) 108 err(EXIT_FAILURE, "asprintf"); 109 tempfd = mkstemp(tfile); 110 if (tempfd < 0) { 111 err(EXIT_FAILURE, "mkstemp"); 112 } 113 unlink(tfile); 114 for (;;) { 115 tlen = read(wfd, buf, len); 116 if (tlen < 0) { 117 err(1, "%s: read", file); 118 } 119 if (tlen == 0) { 120 break; 121 } 122 if (write(tempfd, buf, tlen) != tlen) { 123 err(1, "%s: write", tfile); 124 } 125 } 126 wfd = tempfd; 127 } 128 129 if (fstat(wfd, &stb) == -1) 130 err(EXIT_FAILURE, "%s: fstat", file); 131 if (!S_ISREG(stb.st_mode)) 132 errx(EXIT_FAILURE, "%s: Not a regular file", file); 133 134 seentime = stb.st_mtime; 135 (void)signal(SIGINT, onintr); 136 (void)signal(SIGQUIT, onintr); 137 138 offset = stb.st_size; 139 /* Ignore trailing garbage or partial record */ 140 offset -= offset % (off_t) sizeof(*buf); 141 142 while (offset >= (off_t) sizeof(*buf)) { 143 ssize_t ret, i; 144 size_t size; 145 146 size = MIN((off_t)len, offset); 147 offset -= size; /* Always a multiple of sizeof(*buf) */ 148 ret = pread(wfd, buf, size, offset); 149 if (ret < 0) { 150 err(EXIT_FAILURE, "%s: pread", file); 151 } else if ((size_t) ret < size) { 152 err(EXIT_FAILURE, "%s: Unexpected end of file", file); 153 } 154 155 for (i = ret / sizeof(*buf) - 1; i >= 0; i--) { 156 bp = &buf[i]; 157 158 NULTERM(name); 159 NULTERM(line); 160 NULTERM(host); 161 162 seentime = bp->ut_timefld; 163 164 /* 165 * if the terminal line is '~', the machine stopped. 166 * see utmp(5) for more info. 167 */ 168 if (linep[0] == '~' && !linep[1]) { 169 /* everybody just logged out */ 170 for (T = ttylist; T; T = T->next) 171 T->logout = -bp->ut_timefld; 172 currentout = -bp->ut_timefld; 173 crmsg = strncmp(namep, "shutdown", 174 namesz) ? "crash" : "shutdown"; 175 if (want(bp, NO)) { 176 ct = fmttime(bp->ut_timefld, fulltime); 177 printf("%-*.*s %-*.*s %-*.*s %s\n", 178 namesz, namesz, namep, 179 linesz, linesz, linep, 180 hostsz, hostsz, 181 gethost(bp, hostp, numeric), ct); 182 if (maxrec != -1 && !--maxrec) 183 return; 184 } 185 continue; 186 } 187 /* 188 * if the line is '{' or '|', date got set; see 189 * utmp(5) for more info. 190 */ 191 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 192 if (want(bp, NO)) { 193 ct = fmttime(bp->ut_timefld, fulltime); 194 printf("%-*.*s %-*.*s %-*.*s %s\n", 195 namesz, namesz, namep, 196 linesz, linesz, linep, 197 hostsz, hostsz, 198 gethost(bp, hostp, numeric), 199 ct); 200 if (maxrec && !--maxrec) 201 return; 202 } 203 continue; 204 } 205 /* find associated tty */ 206 for (T = ttylist;; T = T->next) { 207 if (!T) { 208 /* add new one */ 209 T = addtty(linep); 210 break; 211 } 212 if (!strncmp(T->tty, linep, LINESIZE)) 213 break; 214 } 215 if (TYPE(bp) == SIGNATURE) 216 continue; 217 if (namep[0] && want(bp, YES)) { 218 ct = fmttime(bp->ut_timefld, fulltime); 219 printf("%-*.*s %-*.*s %-*.*s %s ", 220 namesz, namesz, namep, 221 linesz, linesz, linep, 222 hostsz, hostsz, 223 gethost(bp, hostp, numeric), 224 ct); 225 if (!T->logout) 226 puts(" still logged in"); 227 else { 228 time_t delta; /* time difference */ 229 230 if (T->logout < 0) { 231 T->logout = -T->logout; 232 printf("- %s", crmsg); 233 } 234 else 235 printf("- %s", 236 fmttime(T->logout, 237 fulltime | TIMEONLY)); 238 delta = T->logout - bp->ut_timefld; 239 if (delta < SECSPERDAY) 240 printf(" (%s)\n", 241 fmttime(delta, 242 fulltime | TIMEONLY | GMT)); 243 else 244 printf(" (%lld+%s)\n", 245 (long long) 246 delta / SECSPERDAY, 247 fmttime(delta, 248 fulltime | TIMEONLY | GMT)); 249 } 250 if (maxrec != -1 && !--maxrec) 251 return; 252 } 253 T->logout = bp->ut_timefld; 254 } 255 } 256 fulltime = 1; /* show full time */ 257 crmsg = fmttime(seentime, FULLTIME); 258 if ((ct = strrchr(file, '/')) != NULL) 259 ct++; 260 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 261 } 262 263 /* 264 * want -- 265 * see if want this entry 266 */ 267 static int 268 want(struct utmp *bp, int check) 269 { 270 ARG *step; 271 272 if (check) { 273 /* 274 * when uucp and ftp log in over a network, the entry in 275 * the utmp file is the name plus their process id. See 276 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 277 */ 278 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 279 bp->ut_line[3] = '\0'; 280 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 281 bp->ut_line[4] = '\0'; 282 } 283 if (!arglist) 284 return (YES); 285 286 for (step = arglist; step; step = step->next) 287 switch(step->type) { 288 case HOST_TYPE: 289 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 290 return (YES); 291 break; 292 case TTY_TYPE: 293 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 294 return (YES); 295 break; 296 case USER_TYPE: 297 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 298 return (YES); 299 break; 300 } 301 return (NO); 302 } 303 304 /* 305 * onintr -- 306 * on interrupt, we inform the user how far we've gotten 307 */ 308 static void 309 onintr(int signo) 310 { 311 /* FIXME: None of this is allowed in a signal handler */ 312 printf("\ninterrupted %s\n", fmttime(seentime, FULLTIME)); 313 if (signo == SIGINT) { 314 (void)raise_default_signal(signo); 315 exit(EXIT_FAILURE); 316 } 317 (void)fflush(stdout); /* fix required for rsh */ 318 } 319
Indexes created Sun Sep 28 16:09:52 GMT 2025