want.c revision 1.11.12.1
1 /* $NetBSD: want.c,v 1.11.12.1 2012/03/15 08:50:41 sborrill 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 FIRSTVALID == 0 43 return numeric ? "" : host; 44 #else 45 if (numeric) { 46 static char buf[512]; 47 buf[0] = '\0'; 48 (void)sockaddr_snprintf(buf, sizeof(buf), "%a", 49 (struct sockaddr *)&ut->ut_ss); 50 return buf; 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 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, *crmsg; 76 size_t len = sizeof(*buf) * MAXUTMP; 77 char namebuf[sizeof(bp->ut_name) + 1], *namep; 78 char linebuf[sizeof(bp->ut_line) + 1], *linep; 79 char hostbuf[sizeof(bp->ut_host) + 1], *hostp; 80 int checkname = namesz > sizeof(bp->ut_name); 81 int checkline = linesz > sizeof(bp->ut_line); 82 int checkhost = hostsz > sizeof(bp->ut_host); 83 84 if ((buf = malloc(len)) == NULL) 85 err(EXIT_FAILURE, "Cannot allocate utmp buffer"); 86 87 crmsg = NULL; 88 89 if (!strcmp(file, "-")) { 90 wfd = STDIN_FILENO; 91 file = "<stdin>"; 92 } else if ((wfd = open(file, O_RDONLY, 0)) < 0) { 93 err(EXIT_FAILURE, "%s", file); 94 } 95 96 if (lseek(wfd, 0, SEEK_CUR) < 0) { 97 const char *dir; 98 char *tfile; 99 int tempfd; 100 ssize_t tlen; 101 102 if (ESPIPE != errno) { 103 err(EXIT_FAILURE, "lseek"); 104 } 105 dir = getenv("TMPDIR"); 106 if (asprintf(&tfile, "%s/last.XXXXXX", dir ? dir : _PATH_TMP) == -1) 107 err(EXIT_FAILURE, "asprintf"); 108 tempfd = mkstemp(tfile); 109 if (tempfd < 0) { 110 err(EXIT_FAILURE, "mkstemp"); 111 } 112 unlink(tfile); 113 for (;;) { 114 tlen = read(wfd, buf, len); 115 if (tlen < 0) { 116 err(1, "%s: read", file); 117 } 118 if (tlen == 0) { 119 break; 120 } 121 if (write(tempfd, buf, tlen) != tlen) { 122 err(1, "%s: write", tfile); 123 } 124 } 125 wfd = tempfd; 126 } 127 128 if (fstat(wfd, &stb) == -1) 129 err(EXIT_FAILURE, "%s: fstat", file); 130 if (!S_ISREG(stb.st_mode)) 131 errx(EXIT_FAILURE, "%s: Not a regular file", file); 132 133 seentime = stb.st_mtime; 134 (void)signal(SIGINT, onintr); 135 (void)signal(SIGQUIT, onintr); 136 137 offset = stb.st_size; 138 /* Ignore trailing garbage or partial record */ 139 offset -= offset % (off_t) sizeof(*buf); 140 141 while (offset >= (off_t) sizeof(*buf)) { 142 ssize_t ret, i; 143 size_t size; 144 145 size = MIN(len, offset); 146 offset -= size; /* Always a multiple of sizeof(*buf) */ 147 ret = pread(wfd, buf, size, offset); 148 if (ret < 0) { 149 err(EXIT_FAILURE, "%s: pread", file); 150 } else if ((size_t) ret < size) { 151 err(EXIT_FAILURE, "%s: Unexpected end of file", file); 152 } 153 154 for (i = ret / sizeof(*buf) - 1; i >= 0; i--) { 155 bp = &buf[i]; 156 157 NULTERM(name); 158 NULTERM(line); 159 NULTERM(host); 160 161 seentime = bp->ut_timefld; 162 163 /* 164 * if the terminal line is '~', the machine stopped. 165 * see utmp(5) for more info. 166 */ 167 if (linep[0] == '~' && !linep[1]) { 168 /* everybody just logged out */ 169 for (T = ttylist; T; T = T->next) 170 T->logout = -bp->ut_timefld; 171 currentout = -bp->ut_timefld; 172 crmsg = strncmp(namep, "shutdown", 173 namesz) ? "crash" : "shutdown"; 174 if (want(bp, NO)) { 175 ct = fmttime(bp->ut_timefld, fulltime); 176 printf("%-*.*s %-*.*s %-*.*s %s\n", 177 namesz, namesz, namep, 178 linesz, linesz, linep, 179 hostsz, hostsz, 180 gethost(bp, hostp, numeric), ct); 181 if (maxrec != -1 && !--maxrec) 182 return; 183 } 184 continue; 185 } 186 /* 187 * if the line is '{' or '|', date got set; see 188 * utmp(5) for more info. 189 */ 190 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 191 if (want(bp, NO)) { 192 ct = fmttime(bp->ut_timefld, fulltime); 193 printf("%-*.*s %-*.*s %-*.*s %s\n", 194 namesz, namesz, namep, 195 linesz, linesz, linep, 196 hostsz, hostsz, 197 gethost(bp, hostp, numeric), 198 ct); 199 if (maxrec && !--maxrec) 200 return; 201 } 202 continue; 203 } 204 /* find associated tty */ 205 for (T = ttylist;; T = T->next) { 206 if (!T) { 207 /* add new one */ 208 T = addtty(linep); 209 break; 210 } 211 if (!strncmp(T->tty, linep, LINESIZE)) 212 break; 213 } 214 if (TYPE(bp) == SIGNATURE) 215 continue; 216 if (namep[0] && want(bp, YES)) { 217 ct = fmttime(bp->ut_timefld, fulltime); 218 printf("%-*.*s %-*.*s %-*.*s %s ", 219 namesz, namesz, namep, 220 linesz, linesz, linep, 221 hostsz, hostsz, 222 gethost(bp, hostp, numeric), 223 ct); 224 if (!T->logout) 225 puts(" still logged in"); 226 else { 227 time_t delta; /* time difference */ 228 229 if (T->logout < 0) { 230 T->logout = -T->logout; 231 printf("- %s", crmsg); 232 } 233 else 234 printf("- %s", 235 fmttime(T->logout, 236 fulltime | TIMEONLY)); 237 delta = T->logout - bp->ut_timefld; 238 if (delta < SECSPERDAY) 239 printf(" (%s)\n", 240 fmttime(delta, 241 fulltime | TIMEONLY | GMT)); 242 else 243 printf(" (%ld+%s)\n", 244 delta / SECSPERDAY, 245 fmttime(delta, 246 fulltime | TIMEONLY | GMT)); 247 } 248 if (maxrec != -1 && !--maxrec) 249 return; 250 } 251 T->logout = bp->ut_timefld; 252 } 253 } 254 fulltime = 1; /* show full time */ 255 crmsg = fmttime(seentime, FULLTIME); 256 if ((ct = strrchr(file, '/')) != NULL) 257 ct++; 258 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 259 } 260 261 /* 262 * want -- 263 * see if want this entry 264 */ 265 static int 266 want(struct utmp *bp, int check) 267 { 268 ARG *step; 269 270 if (check) { 271 /* 272 * when uucp and ftp log in over a network, the entry in 273 * the utmp file is the name plus their process id. See 274 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 275 */ 276 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 277 bp->ut_line[3] = '\0'; 278 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 279 bp->ut_line[4] = '\0'; 280 } 281 if (!arglist) 282 return (YES); 283 284 for (step = arglist; step; step = step->next) 285 switch(step->type) { 286 case HOST_TYPE: 287 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 288 return (YES); 289 break; 290 case TTY_TYPE: 291 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 292 return (YES); 293 break; 294 case USER_TYPE: 295 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 296 return (YES); 297 break; 298 } 299 return (NO); 300 } 301 302 /* 303 * onintr -- 304 * on interrupt, we inform the user how far we've gotten 305 */ 306 static void 307 onintr(int signo) 308 { 309 /* FIXME: None of this is allowed in a signal handler */ 310 printf("\ninterrupted %s\n", fmttime(seentime, FULLTIME)); 311 if (signo == SIGINT) { 312 (void)raise_default_signal(signo); 313 exit(EXIT_FAILURE); 314 } 315 (void)fflush(stdout); /* fix required for rsh */ 316 } 317
Indexes created Wed Oct 22 13:09:56 GMT 2025