want.c revision 1.4
1 /* $NetBSD: want.c,v 1.4 2004/11/19 21:41:25 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 *, int); 36 37 static const char * 38 gethost(struct utmp* ut, int numeric) 39 { 40 #if FIRSTVALID == 0 41 return numeric ? "" : ut->ut_host; 42 #else 43 if (numeric) { 44 static char buf[512]; 45 buf[0] = '\0'; 46 (void)sockaddr_snprintf(buf, sizeof(buf), "%a", 47 (struct sockaddr *)&ut->ut_ss); 48 return buf; 49 } else 50 return ut->ut_host; 51 #endif 52 } 53 54 /* 55 * wtmp -- 56 * read through the wtmp file 57 */ 58 void 59 wtmp(const char *file, int namesz, int linesz, int hostsz, int numeric) 60 { 61 struct utmp *bp; /* current structure */ 62 TTY *T; /* tty list entry */ 63 struct stat stb; /* stat of file for sz */ 64 time_t delta; /* time difference */ 65 off_t bl; 66 int bytes, wfd; 67 char *ct, *crmsg; 68 size_t len = sizeof(*buf) * MAXUTMP; 69 70 if ((buf = malloc(len)) == NULL) 71 err(1, "Cannot allocate utmp buffer"); 72 73 crmsg = NULL; 74 75 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 76 err(1, "%s", file); 77 bl = (stb.st_size + len - 1) / len; 78 79 buf[FIRSTVALID].ut_timefld = time(NULL); 80 (void)signal(SIGINT, onintr); 81 (void)signal(SIGQUIT, onintr); 82 83 while (--bl >= 0) { 84 if (lseek(wfd, bl * len, SEEK_SET) == -1 || 85 (bytes = read(wfd, buf, len)) == -1) 86 err(1, "%s", file); 87 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) { 88 /* 89 * if the terminal line is '~', the machine stopped. 90 * see utmp(5) for more info. 91 */ 92 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 93 /* everybody just logged out */ 94 for (T = ttylist; T; T = T->next) 95 T->logout = -bp->ut_timefld; 96 currentout = -bp->ut_timefld; 97 crmsg = strncmp(bp->ut_name, "shutdown", 98 namesz) ? "crash" : "shutdown"; 99 if (want(bp, NO)) { 100 ct = fmttime(bp->ut_timefld, fulltime); 101 printf("%-*.*s %-*.*s %-*.*s %s\n", 102 namesz, namesz, bp->ut_name, 103 linesz, linesz, bp->ut_line, 104 hostsz, hostsz, 105 gethost(bp, numeric), ct); 106 if (maxrec != -1 && !--maxrec) 107 return; 108 } 109 continue; 110 } 111 /* 112 * if the line is '{' or '|', date got set; see 113 * utmp(5) for more info. 114 */ 115 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 116 && !bp->ut_line[1]) { 117 if (want(bp, NO)) { 118 ct = fmttime(bp->ut_timefld, fulltime); 119 printf("%-*.*s %-*.*s %-*.*s %s\n", 120 namesz, namesz, 121 bp->ut_name, 122 linesz, linesz, 123 bp->ut_line, 124 hostsz, hostsz, 125 gethost(bp, numeric), 126 ct); 127 if (maxrec && !--maxrec) 128 return; 129 } 130 continue; 131 } 132 /* find associated tty */ 133 for (T = ttylist;; T = T->next) { 134 if (!T) { 135 /* add new one */ 136 T = addtty(bp->ut_line); 137 break; 138 } 139 if (!strncmp(T->tty, bp->ut_line, LINESIZE)) 140 break; 141 } 142 if (TYPE(bp) == SIGNATURE) 143 continue; 144 if (bp->ut_name[0] && want(bp, YES)) { 145 ct = fmttime(bp->ut_timefld, fulltime); 146 printf("%-*.*s %-*.*s %-*.*s %s ", 147 namesz, namesz, bp->ut_name, 148 linesz, linesz, bp->ut_line, 149 hostsz, hostsz, 150 gethost(bp, numeric), 151 ct); 152 if (!T->logout) 153 puts(" still logged in"); 154 else { 155 if (T->logout < 0) { 156 T->logout = -T->logout; 157 printf("- %s", crmsg); 158 } 159 else 160 printf("- %s", 161 fmttime(T->logout, 162 fulltime | TIMEONLY)); 163 delta = T->logout - bp->ut_timefld; 164 if (delta < SECSPERDAY) 165 printf(" (%s)\n", 166 fmttime(delta, 167 fulltime | TIMEONLY | GMT)); 168 else 169 printf(" (%ld+%s)\n", 170 delta / SECSPERDAY, 171 fmttime(delta, 172 fulltime | TIMEONLY | GMT)); 173 } 174 if (maxrec != -1 && !--maxrec) 175 return; 176 } 177 T->logout = bp->ut_timefld; 178 } 179 } 180 fulltime = 1; /* show full time */ 181 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 182 if ((ct = strrchr(file, '/')) != NULL) 183 ct++; 184 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 185 } 186 187 /* 188 * want -- 189 * see if want this entry 190 */ 191 static int 192 want(struct utmp *bp, int check) 193 { 194 ARG *step; 195 196 if (check) { 197 /* 198 * when uucp and ftp log in over a network, the entry in 199 * the utmp file is the name plus their process id. See 200 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 201 */ 202 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 203 bp->ut_line[3] = '\0'; 204 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 205 bp->ut_line[4] = '\0'; 206 } 207 if (!arglist) 208 return (YES); 209 210 for (step = arglist; step; step = step->next) 211 switch(step->type) { 212 case HOST_TYPE: 213 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 214 return (YES); 215 break; 216 case TTY_TYPE: 217 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 218 return (YES); 219 break; 220 case USER_TYPE: 221 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 222 return (YES); 223 break; 224 } 225 return (NO); 226 } 227 228 /* 229 * onintr -- 230 * on interrupt, we inform the user how far we've gotten 231 */ 232 static void 233 onintr(int signo) 234 { 235 236 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 237 FULLTIME)); 238 if (signo == SIGINT) 239 exit(1); 240 (void)fflush(stdout); /* fix required for rsh */ 241 } 242
Indexes created Tue Sep 30 11:09:46 GMT 2025