want.c revision 1.6
1 /* $NetBSD: want.c,v 1.6 2006/02/28 17:17:43 ginsbach 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 ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 90 err(1, "%s", file); 91 bl = (stb.st_size + len - 1) / len; 92 93 buf[FIRSTVALID].ut_timefld = time(NULL); 94 (void)signal(SIGINT, onintr); 95 (void)signal(SIGQUIT, onintr); 96 97 while (--bl >= 0) { 98 if (lseek(wfd, bl * len, SEEK_SET) == -1 || 99 (bytes = read(wfd, buf, len)) == -1) 100 err(1, "%s", file); 101 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) { 102 NULTERM(name); 103 NULTERM(line); 104 NULTERM(host); 105 /* 106 * if the terminal line is '~', the machine stopped. 107 * see utmp(5) for more info. 108 */ 109 if (linep[0] == '~' && !linep[1]) { 110 /* everybody just logged out */ 111 for (T = ttylist; T; T = T->next) 112 T->logout = -bp->ut_timefld; 113 currentout = -bp->ut_timefld; 114 crmsg = strncmp(namep, "shutdown", 115 namesz) ? "crash" : "shutdown"; 116 if (want(bp, NO)) { 117 ct = fmttime(bp->ut_timefld, fulltime); 118 printf("%-*.*s %-*.*s %-*.*s %s\n", 119 namesz, namesz, namep, 120 linesz, linesz, linep, 121 hostsz, hostsz, 122 gethost(bp, hostp, numeric), ct); 123 if (maxrec != -1 && !--maxrec) 124 return; 125 } 126 continue; 127 } 128 /* 129 * if the line is '{' or '|', date got set; see 130 * utmp(5) for more info. 131 */ 132 if ((linep[0] == '{' || linep[0] == '|') && !linep[1]) { 133 if (want(bp, NO)) { 134 ct = fmttime(bp->ut_timefld, fulltime); 135 printf("%-*.*s %-*.*s %-*.*s %s\n", 136 namesz, namesz, namep, 137 linesz, linesz, linep, 138 hostsz, hostsz, 139 gethost(bp, hostp, numeric), 140 ct); 141 if (maxrec && !--maxrec) 142 return; 143 } 144 continue; 145 } 146 /* find associated tty */ 147 for (T = ttylist;; T = T->next) { 148 if (!T) { 149 /* add new one */ 150 T = addtty(linep); 151 break; 152 } 153 if (!strncmp(T->tty, linep, LINESIZE)) 154 break; 155 } 156 if (TYPE(bp) == SIGNATURE) 157 continue; 158 if (namep[0] && want(bp, YES)) { 159 ct = fmttime(bp->ut_timefld, fulltime); 160 printf("%-*.*s %-*.*s %-*.*s %s ", 161 namesz, namesz, namep, 162 linesz, linesz, linep, 163 hostsz, hostsz, 164 gethost(bp, hostp, numeric), 165 ct); 166 if (!T->logout) 167 puts(" still logged in"); 168 else { 169 if (T->logout < 0) { 170 T->logout = -T->logout; 171 printf("- %s", crmsg); 172 } 173 else 174 printf("- %s", 175 fmttime(T->logout, 176 fulltime | TIMEONLY)); 177 delta = T->logout - bp->ut_timefld; 178 if (delta < SECSPERDAY) 179 printf(" (%s)\n", 180 fmttime(delta, 181 fulltime | TIMEONLY | GMT)); 182 else 183 printf(" (%ld+%s)\n", 184 delta / SECSPERDAY, 185 fmttime(delta, 186 fulltime | TIMEONLY | GMT)); 187 } 188 if (maxrec != -1 && !--maxrec) 189 return; 190 } 191 T->logout = bp->ut_timefld; 192 } 193 } 194 fulltime = 1; /* show full time */ 195 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 196 if ((ct = strrchr(file, '/')) != NULL) 197 ct++; 198 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 199 } 200 201 /* 202 * want -- 203 * see if want this entry 204 */ 205 static int 206 want(struct utmp *bp, int check) 207 { 208 ARG *step; 209 210 if (check) { 211 /* 212 * when uucp and ftp log in over a network, the entry in 213 * the utmp file is the name plus their process id. See 214 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 215 */ 216 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 217 bp->ut_line[3] = '\0'; 218 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 219 bp->ut_line[4] = '\0'; 220 } 221 if (!arglist) 222 return (YES); 223 224 for (step = arglist; step; step = step->next) 225 switch(step->type) { 226 case HOST_TYPE: 227 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 228 return (YES); 229 break; 230 case TTY_TYPE: 231 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 232 return (YES); 233 break; 234 case USER_TYPE: 235 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 236 return (YES); 237 break; 238 } 239 return (NO); 240 } 241 242 /* 243 * onintr -- 244 * on interrupt, we inform the user how far we've gotten 245 */ 246 static void 247 onintr(int signo) 248 { 249 250 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 251 FULLTIME)); 252 if (signo == SIGINT) 253 exit(1); 254 (void)fflush(stdout); /* fix required for rsh */ 255 } 256
Indexes created Tue Sep 30 07:10:03 GMT 2025