want.c revision 1.3
1 /* $NetBSD: want.c,v 1.3 2004/11/11 00:54:23 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 const char *p; 46 struct sockaddr_storage *ss = &ut->ut_ss; 47 void *a; 48 switch (ss->ss_family) { 49 default: 50 (void)snprintf(buf, sizeof(buf), "%d: unknown family", 51 ss->ss_family); 52 return buf; 53 case 0: /* reboot etc. entries */ 54 return ""; 55 case AF_INET: 56 a = &((struct sockaddr_in *)(void *)ss)->sin_addr; 57 break; 58 case AF_INET6: 59 a = &((struct sockaddr_in6 *)(void *)ss)->sin6_addr; 60 break; 61 } 62 if ((p = inet_ntop(ss->ss_family, a, buf, ss->ss_len)) != NULL) 63 return p; 64 (void)snprintf(buf, sizeof(buf), "%s", strerror(errno)); 65 return buf; 66 } else 67 return ut->ut_host; 68 #endif 69 } 70 71 /* 72 * wtmp -- 73 * read through the wtmp file 74 */ 75 void 76 wtmp(const char *file, int namesz, int linesz, int hostsz, int numeric) 77 { 78 struct utmp *bp; /* current structure */ 79 TTY *T; /* tty list entry */ 80 struct stat stb; /* stat of file for sz */ 81 time_t delta; /* time difference */ 82 off_t bl; 83 int bytes, wfd; 84 char *ct, *crmsg; 85 size_t len = sizeof(*buf) * MAXUTMP; 86 87 if ((buf = malloc(len)) == NULL) 88 err(1, "Cannot allocate utmp buffer"); 89 90 crmsg = NULL; 91 92 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 93 err(1, "%s", file); 94 bl = (stb.st_size + len - 1) / len; 95 96 buf[FIRSTVALID].ut_timefld = time(NULL); 97 (void)signal(SIGINT, onintr); 98 (void)signal(SIGQUIT, onintr); 99 100 while (--bl >= 0) { 101 if (lseek(wfd, bl * len, SEEK_SET) == -1 || 102 (bytes = read(wfd, buf, len)) == -1) 103 err(1, "%s", file); 104 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) { 105 /* 106 * if the terminal line is '~', the machine stopped. 107 * see utmp(5) for more info. 108 */ 109 if (bp->ut_line[0] == '~' && !bp->ut_line[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(bp->ut_name, "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, bp->ut_name, 120 linesz, linesz, bp->ut_line, 121 hostsz, hostsz, 122 gethost(bp, 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 ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 133 && !bp->ut_line[1]) { 134 if (want(bp, NO)) { 135 ct = fmttime(bp->ut_timefld, fulltime); 136 printf("%-*.*s %-*.*s %-*.*s %s\n", 137 namesz, namesz, 138 bp->ut_name, 139 linesz, linesz, 140 bp->ut_line, 141 hostsz, hostsz, 142 gethost(bp, numeric), 143 ct); 144 if (maxrec && !--maxrec) 145 return; 146 } 147 continue; 148 } 149 /* find associated tty */ 150 for (T = ttylist;; T = T->next) { 151 if (!T) { 152 /* add new one */ 153 T = addtty(bp->ut_line); 154 break; 155 } 156 if (!strncmp(T->tty, bp->ut_line, LINESIZE)) 157 break; 158 } 159 if (TYPE(bp) == SIGNATURE) 160 continue; 161 if (bp->ut_name[0] && want(bp, YES)) { 162 ct = fmttime(bp->ut_timefld, fulltime); 163 printf("%-*.*s %-*.*s %-*.*s %s ", 164 namesz, namesz, bp->ut_name, 165 linesz, linesz, bp->ut_line, 166 hostsz, hostsz, 167 gethost(bp, numeric), 168 ct); 169 if (!T->logout) 170 puts(" still logged in"); 171 else { 172 if (T->logout < 0) { 173 T->logout = -T->logout; 174 printf("- %s", crmsg); 175 } 176 else 177 printf("- %s", 178 fmttime(T->logout, 179 fulltime | TIMEONLY)); 180 delta = T->logout - bp->ut_timefld; 181 if (delta < SECSPERDAY) 182 printf(" (%s)\n", 183 fmttime(delta, 184 fulltime | TIMEONLY | GMT)); 185 else 186 printf(" (%ld+%s)\n", 187 delta / SECSPERDAY, 188 fmttime(delta, 189 fulltime | TIMEONLY | GMT)); 190 } 191 if (maxrec != -1 && !--maxrec) 192 return; 193 } 194 T->logout = bp->ut_timefld; 195 } 196 } 197 fulltime = 1; /* show full time */ 198 crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME); 199 if ((ct = strrchr(file, '/')) != NULL) 200 ct++; 201 printf("\n%s begins %s\n", ct ? ct : file, crmsg); 202 } 203 204 /* 205 * want -- 206 * see if want this entry 207 */ 208 static int 209 want(struct utmp *bp, int check) 210 { 211 ARG *step; 212 213 if (check) { 214 /* 215 * when uucp and ftp log in over a network, the entry in 216 * the utmp file is the name plus their process id. See 217 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 218 */ 219 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 220 bp->ut_line[3] = '\0'; 221 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 222 bp->ut_line[4] = '\0'; 223 } 224 if (!arglist) 225 return (YES); 226 227 for (step = arglist; step; step = step->next) 228 switch(step->type) { 229 case HOST_TYPE: 230 if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE)) 231 return (YES); 232 break; 233 case TTY_TYPE: 234 if (!strncmp(step->name, bp->ut_line, LINESIZE)) 235 return (YES); 236 break; 237 case USER_TYPE: 238 if (!strncmp(step->name, bp->ut_name, NAMESIZE)) 239 return (YES); 240 break; 241 } 242 return (NO); 243 } 244 245 /* 246 * onintr -- 247 * on interrupt, we inform the user how far we've gotten 248 */ 249 static void 250 onintr(int signo) 251 { 252 253 printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld, 254 FULLTIME)); 255 if (signo == SIGINT) 256 exit(1); 257 (void)fflush(stdout); /* fix required for rsh */ 258 } 259
Indexes created Tue Sep 30 07:10:03 GMT 2025