want.c revision 1.7
1 /* $NetBSD: want.c,v 1.7 2006/12/27 18:03:26 pooka 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 time_t delta; /* time difference */ 73 off_t bl; 74 int bytes, 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(1, "Cannot allocate utmp buffer"); 86 87 crmsg = NULL; 88 89 if (!strcmp(file, "-")) { 90 if (lseek(STDIN_FILENO, 0, SEEK_CUR) < 0) { 91 char tfile[] = _PATH_TMP "last.XXXXXX"; 92 ssize_t len; 93 94 wfd = mkstemp(tfile); 95 if (wfd < 0) { 96 err(1, "mkstemp"); 97 } 98 unlink(tfile); 99 for (;;) { 100 len = read(STDIN_FILENO, buf, sizeof(buf)); 101 if (len < 0) { 102 err(1, "stdin: read"); 103 } 104 if (len == 0) { 105 break; 106 } 107 len = write(wfd, buf, len); 108 if (len < 0) { 109 err(1, "%s: write", tfile); 110 } 111 } 112 } else { 113 wfd = STDIN_FILENO; 114 } 115 file = "<stdin>"; 116 } else if ((wfd = open(file, O_RDONLY, 0)) < 0) { 117 err(1, "%s", file); 118 } 119 120 if (fstat(wfd, &stb) == -1) 121 err(1, "%s: fstat", file); 122 bl = (stb.st_size + len - 1) / len; 123 124 buf[FIRSTVALID].ut_timefld = time(NULL); 125 (void)signal(SIGINT, onintr); 126 (void)signal(SIGQUIT, onintr); 127 128 while (--bl >= 0) { 129 if (lseek(wfd, bl * len, SEEK_SET) == -1 || 130 (bytes = read(wfd, buf, len)) == -1) 131 err(1, "%s", file); 132 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) { 133 NULTERM(name); 134 NULTERM(line); 135 NULTERM(host); 136 /* 137 * if the terminal line is '~', the machine stopped. 138 * see utmp(5) for more info. 139 */ 140 if (linep[0] == '~' && !linep[1]) { 141 /* everybody just logged out */ 142 for (T = ttylist; T; T = T->next) 143 T->logout = -bp->ut_timefld; 144 currentout = -bp->ut_timefld; 145 crmsg = strncmp(namep, "shutdown", 146 namesz) ? "crash" : "shutdown"; 147 if (want(bp, NO)) { 148 ct = fmttime(bp->ut_timefld, fulltime); 149 printf("%-*.*s %-*.*s %-*.*s %s\n", 150 namesz, namesz, namep, 151 linesz, linesz, linep, 152 hostsz, hostsz, 153 gethost(bp, hostp, numeric), ct); 154 if (maxrec != -1 && !--maxrec) 155 return; 156 } 157 continue; 158 } 159 /* 160 * if the line is '{' or '|', date got set; see 161 * utmp(5) for more info. 162 */ 163 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 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), 171 ct); 172 if (maxrec && !--maxrec) 173 return; 174 } 175 continue; 176 } 177 /* find associated tty */ 178 for (T = ttylist;; T = T->next) { 179 if (!T) { 180 /* add new one */ 181 T = addtty(linep); 182 break; 183 } 184 if (!strncmp(T->tty, linep, LINESIZE)) 185 break; 186 } 187 if (TYPE(bp) == SIGNATURE) 188 continue; 189 if (namep[0] && want(bp, YES)) { 190 ct = fmttime(bp->ut_timefld, fulltime); 191 printf("%-*.*s %-*.*s %-*.*s %s ", 192 namesz, namesz, namep, 193 linesz, linesz, linep, 194 hostsz, hostsz, 195 gethost(bp, hostp, numeric), 196 ct); 197 if (!T->logout) 198 puts(" still logged in"); 199 else { 200 if (T->logout < 0) { 201 T->logout = -T->logout; 202 printf("- %s", crmsg); 203 } 204 else 205 printf("- %s", 206 fmttime(T->logout, 207 fulltime | TIMEONLY)); 208 delta = T->logout - bp->ut_timefld; 209 if (delta < SECSPERDAY) 210 printf(" (%s)\n", 211 fmttime(delta, 212 fulltime | TIMEONLY | GMT)); 213 else 214 printf(" (%ld+%s)\n", 215 delta / SECSPERDAY, 216 fmttime(delta, 217 fulltime | TIMEONLY | GMT)); 218 } 219 if (maxrec != -1 && !--maxrec) 220 return; 221 } 222 T->logout = bp->ut_timefld; 223 } 224 } 225 fulltime = 1; /* show full time */ 226 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 227 if ((ct = strrchr(file, '/')) != NULL) 228 ct++; 229 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 230 } 231 232 /* 233 * want -- 234 * see if want this entry 235 */ 236 static int 237 want(struct utmp *bp, int check) 238 { 239 ARG *step; 240 241 if (check) { 242 /* 243 * when uucp and ftp log in over a network, the entry in 244 * the utmp file is the name plus their process id. See 245 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 246 */ 247 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 248 bp->ut_line[3] = '\0'; 249 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 250 bp->ut_line[4] = '\0'; 251 } 252 if (!arglist) 253 return (YES); 254 255 for (step = arglist; step; step = step->next) 256 switch(step->type) { 257 case HOST_TYPE: 258 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 259 return (YES); 260 break; 261 case TTY_TYPE: 262 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 263 return (YES); 264 break; 265 case USER_TYPE: 266 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 267 return (YES); 268 break; 269 } 270 return (NO); 271 } 272 273 /* 274 * onintr -- 275 * on interrupt, we inform the user how far we've gotten 276 */ 277 static void 278 onintr(int signo) 279 { 280 281 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 282 FULLTIME)); 283 if (signo == SIGINT) 284 exit(1); 285 (void)fflush(stdout); /* fix required for rsh */ 286 } 287
Indexes created Tue Sep 30 07:10:03 GMT 2025