want.c revision 1.8
1 /* $NetBSD: want.c,v 1.8 2007/01/06 14:00:36 cbiere 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 char tfile[] = _PATH_TMP "last.XXXXXX"; 97 int tempfd; 98 ssize_t tlen; 99 100 if (ESPIPE != errno) { 101 err(EXIT_FAILURE, "lseek"); 102 } 103 tempfd = mkstemp(tfile); 104 if (tempfd < 0) { 105 err(EXIT_FAILURE, "mkstemp"); 106 } 107 unlink(tfile); 108 for (;;) { 109 tlen = read(wfd, buf, len); 110 if (tlen < 0) { 111 err(1, "%s: read", file); 112 } 113 if (tlen == 0) { 114 break; 115 } 116 if (write(tempfd, buf, tlen) != tlen) { 117 err(1, "%s: write", tfile); 118 } 119 } 120 wfd = tempfd; 121 } 122 123 if (fstat(wfd, &stb) == -1) 124 err(EXIT_FAILURE, "%s: fstat", file); 125 if (!S_ISREG(stb.st_mode)) 126 errx(EXIT_FAILURE, "%s: Not a regular file", file); 127 128 buf[FIRSTVALID].ut_timefld = time(NULL); 129 (void)signal(SIGINT, onintr); 130 (void)signal(SIGQUIT, onintr); 131 132 offset = stb.st_size; 133 /* Ignore trailing garbage or partial record */ 134 offset -= offset % (off_t) sizeof(*buf); 135 136 while (offset >= (off_t) sizeof(*buf)) { 137 ssize_t ret; 138 size_t size; 139 140 size = MIN(len, offset); 141 offset -= size; /* Always a multiple of sizeof(*buf) */ 142 ret = pread(wfd, buf, size, offset); 143 if (ret < 0) { 144 err(EXIT_FAILURE, "%s: pread", file); 145 } else if ((size_t) ret < size) { 146 err(EXIT_FAILURE, "%s: Unexpected end of file", file); 147 } 148 149 for (bp = &buf[ret / sizeof(*buf) - 1]; bp >= buf; --bp) { 150 NULTERM(name); 151 NULTERM(line); 152 NULTERM(host); 153 /* 154 * if the terminal line is '~', the machine stopped. 155 * see utmp(5) for more info. 156 */ 157 if (linep[0] == '~' && !linep[1]) { 158 /* everybody just logged out */ 159 for (T = ttylist; T; T = T->next) 160 T->logout = -bp->ut_timefld; 161 currentout = -bp->ut_timefld; 162 crmsg = strncmp(namep, "shutdown", 163 namesz) ? "crash" : "shutdown"; 164 if (want(bp, NO)) { 165 ct = fmttime(bp->ut_timefld, fulltime); 166 printf("%-*.*s %-*.*s %-*.*s %s\n", 167 namesz, namesz, namep, 168 linesz, linesz, linep, 169 hostsz, hostsz, 170 gethost(bp, hostp, numeric), ct); 171 if (maxrec != -1 && !--maxrec) 172 return; 173 } 174 continue; 175 } 176 /* 177 * if the line is '{' or '|', date got set; see 178 * utmp(5) for more info. 179 */ 180 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 181 if (want(bp, NO)) { 182 ct = fmttime(bp->ut_timefld, fulltime); 183 printf("%-*.*s %-*.*s %-*.*s %s\n", 184 namesz, namesz, namep, 185 linesz, linesz, linep, 186 hostsz, hostsz, 187 gethost(bp, hostp, numeric), 188 ct); 189 if (maxrec && !--maxrec) 190 return; 191 } 192 continue; 193 } 194 /* find associated tty */ 195 for (T = ttylist;; T = T->next) { 196 if (!T) { 197 /* add new one */ 198 T = addtty(linep); 199 break; 200 } 201 if (!strncmp(T->tty, linep, LINESIZE)) 202 break; 203 } 204 if (TYPE(bp) == SIGNATURE) 205 continue; 206 if (namep[0] && want(bp, YES)) { 207 ct = fmttime(bp->ut_timefld, fulltime); 208 printf("%-*.*s %-*.*s %-*.*s %s ", 209 namesz, namesz, namep, 210 linesz, linesz, linep, 211 hostsz, hostsz, 212 gethost(bp, hostp, numeric), 213 ct); 214 if (!T->logout) 215 puts(" still logged in"); 216 else { 217 time_t delta; /* time difference */ 218 219 if (T->logout < 0) { 220 T->logout = -T->logout; 221 printf("- %s", crmsg); 222 } 223 else 224 printf("- %s", 225 fmttime(T->logout, 226 fulltime | TIMEONLY)); 227 delta = T->logout - bp->ut_timefld; 228 if (delta < SECSPERDAY) 229 printf(" (%s)\n", 230 fmttime(delta, 231 fulltime | TIMEONLY | GMT)); 232 else 233 printf(" (%ld+%s)\n", 234 delta / SECSPERDAY, 235 fmttime(delta, 236 fulltime | TIMEONLY | GMT)); 237 } 238 if (maxrec != -1 && !--maxrec) 239 return; 240 } 241 T->logout = bp->ut_timefld; 242 } 243 } 244 fulltime = 1; /* show full time */ 245 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 246 if ((ct = strrchr(file, '/')) != NULL) 247 ct++; 248 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 249 } 250 251 /* 252 * want -- 253 * see if want this entry 254 */ 255 static int 256 want(struct utmp *bp, int check) 257 { 258 ARG *step; 259 260 if (check) { 261 /* 262 * when uucp and ftp log in over a network, the entry in 263 * the utmp file is the name plus their process id. See 264 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 265 */ 266 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 267 bp->ut_line[3] = '\0'; 268 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 269 bp->ut_line[4] = '\0'; 270 } 271 if (!arglist) 272 return (YES); 273 274 for (step = arglist; step; step = step->next) 275 switch(step->type) { 276 case HOST_TYPE: 277 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 278 return (YES); 279 break; 280 case TTY_TYPE: 281 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 282 return (YES); 283 break; 284 case USER_TYPE: 285 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 286 return (YES); 287 break; 288 } 289 return (NO); 290 } 291 292 /* 293 * onintr -- 294 * on interrupt, we inform the user how far we've gotten 295 */ 296 static void 297 onintr(int signo) 298 { 299 /* FIXME: None of this is allowed in a signal handler */ 300 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 301 FULLTIME)); 302 if (signo == SIGINT) 303 exit(EXIT_FAILURE); 304 (void)fflush(stdout); /* fix required for rsh */ 305 } 306
Indexes created Tue Sep 30 11:09:46 GMT 2025