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) 05/08/89"; 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 } 266