want.c revision 1.2
1 /* $NetBSD: want.c,v 1.2 2003/08/07 11:14:18 agc 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 36 /* 37 * wtmp -- 38 * read through the wtmp file 39 */ 40 void 41 wtmp(const char *file, int namesz, int linesz, int hostsz) 42 { 43 struct utmp *bp; /* current structure */ 44 TTY *T; /* tty list entry */ 45 struct stat stb; /* stat of file for sz */ 46 time_t delta; /* time difference */ 47 off_t bl; 48 int bytes, wfd; 49 char *ct, *crmsg; 50 size_t len = sizeof(*buf) * MAXUTMP; 51 52 if ((buf = malloc(len)) == NULL) 53 err(1, "Cannot allocate utmp buffer"); 54 55 crmsg = NULL; 56 57 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 58 err(1, "%s", file); 59 bl = (stb.st_size + len - 1) / len; 60 61 buf[FIRSTVALID].ut_timefld = time(NULL); 62 (void)signal(SIGINT, onintr); 63 (void)signal(SIGQUIT, onintr); 64 65 while (--bl >= 0) { 66 if (lseek(wfd, bl * len, SEEK_SET) == -1 || 67 (bytes = read(wfd, buf, len)) == -1) 68 err(1, "%s", file); 69 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) { 70 /* 71 * if the terminal line is '~', the machine stopped. 72 * see utmp(5) for more info. 73 */ 74 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 75 /* everybody just logged out */ 76 for (T = ttylist; T; T = T->next) 77 T->logout = -bp->ut_timefld; 78 currentout = -bp->ut_timefld; 79 crmsg = strncmp(bp->ut_name, "shutdown", 80 namesz) ? "crash" : "shutdown"; 81 if (want(bp, NO)) { 82 ct = fmttime(bp->ut_timefld, fulltime); 83 printf("%-*.*s %-*.*s %-*.*s %s\n", 84 namesz, namesz, bp->ut_name, 85 linesz, linesz, bp->ut_line, 86 hostsz, hostsz, bp->ut_host, ct); 87 if (maxrec != -1 && !--maxrec) 88 return; 89 } 90 continue; 91 } 92 /* 93 * if the line is '{' or '|', date got set; see 94 * utmp(5) for more info. 95 */ 96 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 97 && !bp->ut_line[1]) { 98 if (want(bp, NO)) { 99 ct = fmttime(bp->ut_timefld, fulltime); 100 printf("%-*.*s %-*.*s %-*.*s %s\n", 101 namesz, namesz, 102 bp->ut_name, 103 linesz, linesz, 104 bp->ut_line, 105 hostsz, hostsz, 106 bp->ut_host, 107 ct); 108 if (maxrec && !--maxrec) 109 return; 110 } 111 continue; 112 } 113 /* find associated tty */ 114 for (T = ttylist;; T = T->next) { 115 if (!T) { 116 /* add new one */ 117 T = addtty(bp->ut_line); 118 break; 119 } 120 if (!strncmp(T->tty, bp->ut_line, LINESIZE)) 121 break; 122 } 123 if (TYPE(bp) == SIGNATURE) 124 continue; 125 if (bp->ut_name[0] && want(bp, YES)) { 126 ct = fmttime(bp->ut_timefld, fulltime); 127 printf("%-*.*s %-*.*s %-*.*s %s ", 128 namesz, namesz, bp->ut_name, 129 linesz, linesz, bp->ut_line, 130 hostsz, hostsz, bp->ut_host, 131 ct); 132 if (!T->logout) 133 puts(" still logged in"); 134 else { 135 if (T->logout < 0) { 136 T->logout = -T->logout; 137 printf("- %s", crmsg); 138 } 139 else 140 printf("- %s", 141 fmttime(T->logout, 142 fulltime | TIMEONLY)); 143 delta = T->logout - bp->ut_timefld; 144 if (delta < SECSPERDAY) 145 printf(" (%s)\n", 146 fmttime(delta, 147 fulltime | TIMEONLY | GMT)); 148 else 149 printf(" (%ld+%s)\n", 150 delta / SECSPERDAY, 151 fmttime(delta, 152 fulltime | TIMEONLY | GMT)); 153 } 154 if (maxrec != -1 && !--maxrec) 155 return; 156 } 157 T->logout = bp->ut_timefld; 158 } 159 } 160 fulltime = 1; /* show full time */ 161 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 162 if ((ct = strrchr(file, '/')) != NULL) 163 ct++; 164 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 165 } 166 167 /* 168 * want -- 169 * see if want this entry 170 */ 171 static int 172 want(struct utmp *bp, int check) 173 { 174 ARG *step; 175 176 if (check) { 177 /* 178 * when uucp and ftp log in over a network, the entry in 179 * the utmp file is the name plus their process id. See 180 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 181 */ 182 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 183 bp->ut_line[3] = '\0'; 184 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 185 bp->ut_line[4] = '\0'; 186 } 187 if (!arglist) 188 return (YES); 189 190 for (step = arglist; step; step = step->next) 191 switch(step->type) { 192 case HOST_TYPE: 193 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 194 return (YES); 195 break; 196 case TTY_TYPE: 197 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 198 return (YES); 199 break; 200 case USER_TYPE: 201 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 202 return (YES); 203 break; 204 } 205 return (NO); 206 } 207 208 /* 209 * onintr -- 210 * on interrupt, we inform the user how far we've gotten 211 */ 212 static void 213 onintr(int signo) 214 { 215 216 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 217 FULLTIME)); 218 if (signo == SIGINT) 219 exit(1); 220 (void)fflush(stdout); /* fix required for rsh */ 221 } 222
Indexes created Tue Sep 30 07:10:03 GMT 2025