| 1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms are permitted |
| 6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, |
| 8 | * advertising materials, and other materials related to such |
| 9 | * distribution and use acknowledge that the software was developed |
| 10 | * by the University of California, Berkeley. The name of the |
| 11 | * University may not be used to endorse or promote products derived |
| 12 | * from this software without specific prior written permission. |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | */ |
| 17 | |
| 18 | #ifndef lint |
| 19 | static char sccsid[] = "@(#)util.c 5.5 (Berkeley) %G%"; |
| 20 | #endif /* not lint */ |
| 21 | |
| 22 | #include <sys/param.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/file.h> |
| 25 | #include <stdio.h> |
| 26 | #include <ctype.h> |
| 27 | #include <strings.h> |
| 28 | #include "finger.h" |
| 29 | #include "pathnames.h" |
| 30 | |
| 31 | find_idle_and_ttywrite(w) |
| 32 | register WHERE *w; |
| 33 | { |
| 34 | extern time_t now; |
| 35 | extern int errno; |
| 36 | struct stat sb; |
| 37 | char *strerror(); |
| 38 | |
| 39 | (void)sprintf(tbuf, "%s/%s", _PATH_DEV, w->tty); |
| 40 | if (stat(tbuf, &sb) < 0) { |
| 41 | (void)fprintf(stderr, |
| 42 | "finger: %s: %s\n", tbuf, strerror(errno)); |
| 43 | exit(1); |
| 44 | } |
| 45 | w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime; |
| 46 | |
| 47 | #define TALKABLE 0220 /* tty is writable if 220 mode */ |
| 48 | w->writable = ((sb.st_mode & TALKABLE) == TALKABLE); |
| 49 | } |
| 50 | |
| 51 | userinfo(pn, pw) |
| 52 | register PERSON *pn; |
| 53 | register struct passwd *pw; |
| 54 | { |
| 55 | register char *p, *t; |
| 56 | char name[256]; |
| 57 | |
| 58 | pn->realname = pn->office = pn->officephone = pn->homephone = NULL; |
| 59 | |
| 60 | pn->uid = pw->pw_uid; |
| 61 | pn->name = strdup(pw->pw_name); |
| 62 | pn->dir = strdup(pw->pw_dir); |
| 63 | pn->shell = strdup(pw->pw_shell); |
| 64 | |
| 65 | /* why do we skip asterisks!?!? */ |
| 66 | (void)strcpy(p = tbuf, pw->pw_gecos); |
| 67 | if (*p == '*') |
| 68 | ++p; |
| 69 | |
| 70 | /* ampersands get replaced by the login name */ |
| 71 | if (!(p = strsep(p, ","))) |
| 72 | return; |
| 73 | for (t = name; *t = *p; ++p) |
| 74 | if (*t == '&') { |
| 75 | (void)strcpy(t, pw->pw_name); |
| 76 | if (islower(*t)) |
| 77 | *t = toupper(*t); |
| 78 | while (*++t); |
| 79 | } |
| 80 | else |
| 81 | ++t; |
| 82 | pn->realname = strdup(name); |
| 83 | pn->office = (p = strsep((char *)NULL, ",")) ? strdup(p) : NULL; |
| 84 | pn->officephone = (p = strsep((char *)NULL, ",")) ? strdup(p) : NULL; |
| 85 | pn->homephone = (p = strsep((char *)NULL, ",")) ? strdup(p) : NULL; |
| 86 | } |
| 87 | |
| 88 | match(pw, user) |
| 89 | struct passwd *pw; |
| 90 | char *user; |
| 91 | { |
| 92 | register char *p, *t; |
| 93 | char name[256]; |
| 94 | |
| 95 | /* why do we skip asterisks!?!? */ |
| 96 | (void)strcpy(p = tbuf, pw->pw_gecos); |
| 97 | if (*p == '*') |
| 98 | ++p; |
| 99 | |
| 100 | /* ampersands get replaced by the login name */ |
| 101 | if (!(p = strtok(p, ","))) |
| 102 | return(0); |
| 103 | for (t = name; *t = *p; ++p) |
| 104 | if (*t == '&') { |
| 105 | (void)strcpy(t, pw->pw_name); |
| 106 | while (*++t); |
| 107 | } |
| 108 | else |
| 109 | ++t; |
| 110 | for (t = name; p = strtok(t, "\t "); t = (char *)NULL) |
| 111 | if (!strcasecmp(p, user)) |
| 112 | return(1); |
| 113 | return(0); |
| 114 | } |
| 115 | |
| 116 | enter_lastlog(pn) |
| 117 | register PERSON *pn; |
| 118 | { |
| 119 | register WHERE *w; |
| 120 | static int opened, fd; |
| 121 | struct lastlog ll; |
| 122 | char doit = 0; |
| 123 | off_t lseek(); |
| 124 | |
| 125 | /* some systems may not maintain lastlog, don't report errors. */ |
| 126 | if (!opened) { |
| 127 | fd = open(_PATH_LASTLOG, O_RDONLY, 0); |
| 128 | opened = 1; |
| 129 | } |
| 130 | if (fd == -1 || |
| 131 | lseek(fd, (long)pn->uid * sizeof(ll), L_SET) != |
| 132 | (long)pn->uid * sizeof(ll) || |
| 133 | read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) { |
| 134 | /* as if never logged in */ |
| 135 | ll.ll_line[0] = ll.ll_host[0] = NULL; |
| 136 | ll.ll_time = 0; |
| 137 | } |
| 138 | if ((w = pn->whead) == NULL) |
| 139 | doit = 1; |
| 140 | else if (ll.ll_time != 0) { |
| 141 | /* if last login is earlier than some current login */ |
| 142 | for (; !doit && w != NULL; w = w->next) |
| 143 | if (w->info == LOGGEDIN && w->loginat < ll.ll_time) |
| 144 | doit = 1; |
| 145 | /* |
| 146 | * and if it's not any of the current logins |
| 147 | * can't use time comparison because there may be a small |
| 148 | * discrepency since login calls time() twice |
| 149 | */ |
| 150 | for (w = pn->whead; doit && w != NULL; w = w->next) |
| 151 | if (w->info == LOGGEDIN && |
| 152 | strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0) |
| 153 | doit = 0; |
| 154 | } |
| 155 | if (doit) { |
| 156 | w = walloc(pn); |
| 157 | w->info = LASTLOG; |
| 158 | bcopy(ll.ll_line, w->tty, UT_LINESIZE); |
| 159 | w->tty[UT_LINESIZE] = 0; |
| 160 | bcopy(ll.ll_host, w->host, UT_HOSTSIZE); |
| 161 | w->host[UT_HOSTSIZE] = 0; |
| 162 | w->loginat = ll.ll_time; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | enter_where(ut, pn) |
| 167 | struct utmp *ut; |
| 168 | PERSON *pn; |
| 169 | { |
| 170 | register WHERE *w = walloc(pn); |
| 171 | |
| 172 | w->info = LOGGEDIN; |
| 173 | bcopy(ut->ut_line, w->tty, UT_LINESIZE); |
| 174 | w->tty[UT_LINESIZE] = 0; |
| 175 | bcopy(ut->ut_host, w->host, UT_HOSTSIZE); |
| 176 | w->host[UT_HOSTSIZE] = 0; |
| 177 | w->loginat = (time_t)ut->ut_time; |
| 178 | find_idle_and_ttywrite(w); |
| 179 | } |
| 180 | |
| 181 | PERSON * |
| 182 | enter_person(pw) |
| 183 | register struct passwd *pw; |
| 184 | { |
| 185 | register PERSON *pn, **pp; |
| 186 | |
| 187 | for (pp = htab + hash(pw->pw_name); |
| 188 | *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0; |
| 189 | pp = &(*pp)->hlink) |
| 190 | ; |
| 191 | if ((pn = *pp) == NULL) { |
| 192 | pn = palloc(); |
| 193 | entries++; |
| 194 | if (phead == NULL) |
| 195 | phead = ptail = pn; |
| 196 | else { |
| 197 | ptail->next = pn; |
| 198 | ptail = pn; |
| 199 | } |
| 200 | pn->next = NULL; |
| 201 | pn->hlink = NULL; |
| 202 | *pp = pn; |
| 203 | userinfo(pn, pw); |
| 204 | pn->whead = NULL; |
| 205 | } |
| 206 | return(pn); |
| 207 | } |
| 208 | |
| 209 | PERSON * |
| 210 | find_person(name) |
| 211 | char *name; |
| 212 | { |
| 213 | register PERSON *pn; |
| 214 | |
| 215 | /* name may be only UT_NAMESIZE long and not terminated */ |
| 216 | for (pn = htab[hash(name)]; |
| 217 | pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0; |
| 218 | pn = pn->hlink) |
| 219 | ; |
| 220 | return(pn); |
| 221 | } |
| 222 | |
| 223 | hash(name) |
| 224 | register char *name; |
| 225 | { |
| 226 | register int h, i; |
| 227 | |
| 228 | h = 0; |
| 229 | /* name may be only UT_NAMESIZE long and not terminated */ |
| 230 | for (i = UT_NAMESIZE; --i >= 0 && *name;) |
| 231 | h = ((h << 2 | h >> HBITS - 2) ^ *name++) & HMASK; |
| 232 | return(h); |
| 233 | } |
| 234 | |
| 235 | PERSON * |
| 236 | palloc() |
| 237 | { |
| 238 | PERSON *p; |
| 239 | |
| 240 | if ((p = (PERSON *)malloc((u_int) sizeof(PERSON))) == NULL) { |
| 241 | (void)fprintf(stderr, "finger: out of space.\n"); |
| 242 | exit(1); |
| 243 | } |
| 244 | return(p); |
| 245 | } |
| 246 | |
| 247 | WHERE * |
| 248 | walloc(pn) |
| 249 | register PERSON *pn; |
| 250 | { |
| 251 | register WHERE *w; |
| 252 | |
| 253 | if ((w = (WHERE *)malloc((u_int) sizeof(WHERE))) == NULL) { |
| 254 | (void)fprintf(stderr, "finger: out of space.\n"); |
| 255 | exit(1); |
| 256 | } |
| 257 | if (pn->whead == NULL) |
| 258 | pn->whead = pn->wtail = w; |
| 259 | else { |
| 260 | pn->wtail->next = w; |
| 261 | pn->wtail = w; |
| 262 | } |
| 263 | w->next = NULL; |
| 264 | return(w); |
| 265 | } |