want.c revision 1.12
1 /* $NetBSD: want.c,v 1.12 2008/12/29 01:25:04 christos 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 33 static void onintr(int); 34 static int want(struct utmp *, int); 35 static const char *gethost(struct utmp *, const char *, int); 36 37 static const char * 38 /*ARGSUSED*/ 39 gethost(struct utmp *ut, const char *host, int numeric) 40 { 41 #if FIRSTVALID == 0 42 return numeric ? "" : host; 43 #else 44 if (numeric) { 45 static char buf[512]; 46 buf[0] = '\0'; 47 (void)sockaddr_snprintf(buf, sizeof(buf), "%a", 48 (struct sockaddr *)&ut->ut_ss); 49 return buf; 50 } else 51 return host; 52 #endif 53 } 54 55 #define NULTERM(what) \ 56 if (check ## what) \ 57 (void)strlcpy(what ## p = what ## buf, bp->ut_ ## what, \ 58 sizeof(what ## buf)); \ 59 else \ 60 what ## p = bp->ut_ ## what 61 62 /* 63 * wtmp -- 64 * read through the wtmp file 65 */ 66 void 67 wtmp(const char *file, int namesz, int linesz, int hostsz, int numeric) 68 { 69 struct utmp *bp; /* current structure */ 70 TTY *T; /* tty list entry */ 71 struct stat stb; /* stat of file for sz */ 72 off_t offset; 73 int wfd; 74 char *ct, *crmsg; 75 size_t len = sizeof(*buf) * MAXUTMP; 76 char namebuf[sizeof(bp->ut_name) + 1], *namep; 77 char linebuf[sizeof(bp->ut_line) + 1], *linep; 78 char hostbuf[sizeof(bp->ut_host) + 1], *hostp; 79 int checkname = namesz > sizeof(bp->ut_name); 80 int checkline = linesz > sizeof(bp->ut_line); 81 int checkhost = hostsz > sizeof(bp->ut_host); 82 83 if ((buf = malloc(len)) == NULL) 84 err(EXIT_FAILURE, "Cannot allocate utmp buffer"); 85 86 crmsg = NULL; 87 88 if (!strcmp(file, "-")) { 89 wfd = STDIN_FILENO; 90 file = "<stdin>"; 91 } else if ((wfd = open(file, O_RDONLY, 0)) < 0) { 92 err(EXIT_FAILURE, "%s", file); 93 } 94 95 if (lseek(wfd, 0, SEEK_CUR) < 0) { 96 const char *dir; 97 char *tfile; 98 int tempfd; 99 ssize_t tlen; 100 101 if (ESPIPE != errno) { 102 err(EXIT_FAILURE, "lseek"); 103 } 104 dir = getenv("TMPDIR"); 105 if (asprintf(&tfile, "%s/last.XXXXXX", dir ? dir : _PATH_TMP) == -1) 106 err(EXIT_FAILURE, "asprintf"); 107 tempfd = mkstemp(tfile); 108 if (tempfd < 0) { 109 err(EXIT_FAILURE, "mkstemp"); 110 } 111 unlink(tfile); 112 for (;;) { 113 tlen = read(wfd, buf, len); 114 if (tlen < 0) { 115 err(1, "%s: read", file); 116 } 117 if (tlen == 0) { 118 break; 119 } 120 if (write(tempfd, buf, tlen) != tlen) { 121 err(1, "%s: write", tfile); 122 } 123 } 124 wfd = tempfd; 125 } 126 127 if (fstat(wfd, &stb) == -1) 128 err(EXIT_FAILURE, "%s: fstat", file); 129 if (!S_ISREG(stb.st_mode)) 130 errx(EXIT_FAILURE, "%s: Not a regular file", file); 131 132 buf[FIRSTVALID].ut_timefld = time(NULL); 133 (void)signal(SIGINT, onintr); 134 (void)signal(SIGQUIT, onintr); 135 136 offset = stb.st_size; 137 /* Ignore trailing garbage or partial record */ 138 offset -= offset % (off_t) sizeof(*buf); 139 140 while (offset >= (off_t) sizeof(*buf)) { 141 ssize_t ret, i; 142 size_t size; 143 144 size = MIN(len, offset); 145 offset -= size; /* Always a multiple of sizeof(*buf) */ 146 ret = pread(wfd, buf, size, offset); 147 if (ret < 0) { 148 err(EXIT_FAILURE, "%s: pread", file); 149 } else if ((size_t) ret < size) { 150 err(EXIT_FAILURE, "%s: Unexpected end of file", file); 151 } 152 153 for (i = ret / sizeof(*buf) - 1; i >= 0; i--) { 154 bp = &buf[i]; 155 156 NULTERM(name); 157 NULTERM(line); 158 NULTERM(host); 159 /* 160 * if the terminal line is '~', the machine stopped. 161 * see utmp(5) for more info. 162 */ 163 if (linep[0] == '~' && !linep[1]) { 164 /* everybody just logged out */ 165 for (T = ttylist; T; T = T->next) 166 T->logout = -bp->ut_timefld; 167 currentout = -bp->ut_timefld; 168 crmsg = strncmp(namep, "shutdown", 169 namesz) ? "crash" : "shutdown"; 170 if (want(bp, NO)) { 171 ct = fmttime(bp->ut_timefld, fulltime); 172 printf("%-*.*s %-*.*s %-*.*s %s\n", 173 namesz, namesz, namep, 174 linesz, linesz, linep, 175 hostsz, hostsz, 176 gethost(bp, hostp, numeric), ct); 177 if (maxrec != -1 && !--maxrec) 178 return; 179 } 180 continue; 181 } 182 /* 183 * if the line is '{' or '|', date got set; see 184 * utmp(5) for more info. 185 */ 186 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 187 if (want(bp, NO)) { 188 ct = fmttime(bp->ut_timefld, fulltime); 189 printf("%-*.*s %-*.*s %-*.*s %s\n", 190 namesz, namesz, namep, 191 linesz, linesz, linep, 192 hostsz, hostsz, 193 gethost(bp, hostp, numeric), 194 ct); 195 if (maxrec && !--maxrec) 196 return; 197 } 198 continue; 199 } 200 /* find associated tty */ 201 for (T = ttylist;; T = T->next) { 202 if (!T) { 203 /* add new one */ 204 T = addtty(linep); 205 break; 206 } 207 if (!strncmp(T->tty, linep, LINESIZE)) 208 break; 209 } 210 if (TYPE(bp) == SIGNATURE) 211 continue; 212 if (namep[0] && want(bp, YES)) { 213 ct = fmttime(bp->ut_timefld, fulltime); 214 printf("%-*.*s %-*.*s %-*.*s %s ", 215 namesz, namesz, namep, 216 linesz, linesz, linep, 217 hostsz, hostsz, 218 gethost(bp, hostp, numeric), 219 ct); 220 if (!T->logout) 221 puts(" still logged in"); 222 else { 223 time_t delta; /* time difference */ 224 225 if (T->logout < 0) { 226 T->logout = -T->logout; 227 printf("- %s", crmsg); 228 } 229 else 230 printf("- %s", 231 fmttime(T->logout, 232 fulltime | TIMEONLY)); 233 delta = T->logout - bp->ut_timefld; 234 if (delta < SECSPERDAY) 235 printf(" (%s)\n", 236 fmttime(delta, 237 fulltime | TIMEONLY | GMT)); 238 else 239 printf(" (%lld+%s)\n", 240 (long long) 241 delta / SECSPERDAY, 242 fmttime(delta, 243 fulltime | TIMEONLY | GMT)); 244 } 245 if (maxrec != -1 && !--maxrec) 246 return; 247 } 248 T->logout = bp->ut_timefld; 249 } 250 } 251 fulltime = 1; /* show full time */ 252 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 253 if ((ct = strrchr(file, '/')) != NULL) 254 ct++; 255 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 256 } 257 258 /* 259 * want -- 260 * see if want this entry 261 */ 262 static int 263 want(struct utmp *bp, int check) 264 { 265 ARG *step; 266 267 if (check) { 268 /* 269 * when uucp and ftp log in over a network, the entry in 270 * the utmp file is the name plus their process id. See 271 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 272 */ 273 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 274 bp->ut_line[3] = '\0'; 275 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 276 bp->ut_line[4] = '\0'; 277 } 278 if (!arglist) 279 return (YES); 280 281 for (step = arglist; step; step = step->next) 282 switch(step->type) { 283 case HOST_TYPE: 284 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 285 return (YES); 286 break; 287 case TTY_TYPE: 288 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 289 return (YES); 290 break; 291 case USER_TYPE: 292 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 293 return (YES); 294 break; 295 } 296 return (NO); 297 } 298 299 /* 300 * onintr -- 301 * on interrupt, we inform the user how far we've gotten 302 */ 303 static void 304 onintr(int signo) 305 { 306 /* FIXME: None of this is allowed in a signal handler */ 307 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 308 FULLTIME)); 309 if (signo == SIGINT) { 310 (void)raise_default_signal(signo); 311 exit(EXIT_FAILURE); 312 } 313 (void)fflush(stdout); /* fix required for rsh */ 314 } 315
Indexes created Mon Sep 29 21:09:56 GMT 2025