1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <ttyent.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <ctype.h> 44 #include <string.h> 45 #include <dirent.h> 46 #include <paths.h> 47 48 static char zapchar; 49 static FILE *tf; 50 static int maxpts = 0; 51 static int curpts = 0; 52 static int pts_valid = 0; 53 static size_t lbsize; 54 static char *line; 55 56 #define PTS "pts/" 57 #define MALLOCCHUNK 100 58 59 static char *skip(char *); 60 static char *value(char *); 61 62 struct ttyent * 63 getttynam(tty) 64 const char *tty; 65 { 66 struct ttyent *t; 67 68 if (strncmp(tty, "/dev/", 5) == 0) 69 tty += 5; 70 setttyent(); 71 while ( (t = getttyent()) ) 72 if (!strcmp(tty, t->ty_name)) 73 break; 74 endttyent(); 75 return (t); 76 } 77 78 struct ttyent * 79 getttyent() 80 { 81 static struct ttyent tty; 82 static char devpts_name[] = "pts/4294967295"; 83 char *p; 84 int c; 85 size_t i; 86 87 if (!tf && !setttyent()) 88 return (NULL); 89 for (;;) { 90 if (!fgets(p = line, lbsize, tf)) { 91 if (pts_valid == 1 && curpts <= maxpts) { 92 sprintf(devpts_name, "pts/%d", curpts++); 93 tty.ty_name = devpts_name; 94 tty.ty_getty = tty.ty_type = NULL; 95 tty.ty_status = TTY_NETWORK; 96 tty.ty_window = NULL; 97 tty.ty_comment = NULL; 98 tty.ty_group = _TTYS_NOGROUP; 99 return (&tty); 100 } 101 return (NULL); 102 } 103 /* extend buffer if line was too big, and retry */ 104 while (!index(p, '\n')) { 105 i = strlen(p); 106 lbsize += MALLOCCHUNK; 107 if ((p = realloc(line, lbsize)) == NULL) { 108 (void)endttyent(); 109 return (NULL); 110 } 111 line = p; 112 if (!fgets(&line[i], lbsize - i, tf)) 113 return (NULL); 114 } 115 while (isspace((unsigned char)*p)) 116 ++p; 117 if (*p && *p != '#') 118 break; 119 } 120 121 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 122 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 123 124 zapchar = 0; 125 tty.ty_name = p; 126 tty.ty_status = 0; 127 tty.ty_window = NULL; 128 tty.ty_group = _TTYS_NOGROUP; 129 130 p = skip(p); 131 if (!*(tty.ty_getty = p)) 132 tty.ty_getty = tty.ty_type = NULL; 133 else { 134 p = skip(p); 135 if (!*(tty.ty_type = p)) 136 tty.ty_type = NULL; 137 else { 138 /* compatibility kludge: handle network/dialup specially */ 139 if (scmp(_TTYS_DIALUP)) 140 tty.ty_status |= TTY_DIALUP; 141 else if (scmp(_TTYS_NETWORK)) 142 tty.ty_status |= TTY_NETWORK; 143 p = skip(p); 144 } 145 } 146 147 for (; *p; p = skip(p)) { 148 if (scmp(_TTYS_OFF)) 149 tty.ty_status &= ~TTY_ON; 150 else if (scmp(_TTYS_ON)) 151 tty.ty_status |= TTY_ON; 152 else if (scmp(_TTYS_SECURE)) 153 tty.ty_status |= TTY_SECURE; 154 else if (scmp(_TTYS_INSECURE)) 155 tty.ty_status &= ~TTY_SECURE; 156 else if (scmp(_TTYS_DIALUP)) 157 tty.ty_status |= TTY_DIALUP; 158 else if (scmp(_TTYS_NETWORK)) 159 tty.ty_status |= TTY_NETWORK; 160 else if (vcmp(_TTYS_WINDOW)) 161 tty.ty_window = value(p); 162 else if (vcmp(_TTYS_GROUP)) 163 tty.ty_group = value(p); 164 else 165 break; 166 } 167 168 if (zapchar == '#' || *p == '#') 169 while ((c = *++p) == ' ' || c == '\t') 170 ; 171 tty.ty_comment = p; 172 if (*p == 0) 173 tty.ty_comment = 0; 174 if ( (p = index(p, '\n')) ) 175 *p = '\0'; 176 return (&tty); 177 } 178 179 #define QUOTED 1 180 181 /* 182 * Skip over the current field, removing quotes, and return a pointer to 183 * the next field. 184 */ 185 static char * 186 skip(p) 187 char *p; 188 { 189 char *t; 190 int c, q; 191 192 for (q = 0, t = p; (c = *p) != '\0'; p++) { 193 if (c == '"') { 194 q ^= QUOTED; /* obscure, but nice */ 195 continue; 196 } 197 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 198 p++; 199 *t++ = *p; 200 if (q == QUOTED) 201 continue; 202 if (c == '#') { 203 zapchar = c; 204 *p = 0; 205 break; 206 } 207 if (c == '\t' || c == ' ' || c == '\n') { 208 zapchar = c; 209 *p++ = 0; 210 while ((c = *p) == '\t' || c == ' ' || c == '\n') 211 p++; 212 break; 213 } 214 } 215 *--t = '\0'; 216 return (p); 217 } 218 219 static char * 220 value(p) 221 char *p; 222 { 223 224 return ((p = index(p, '=')) ? ++p : NULL); 225 } 226 227 int 228 setttyent() 229 { 230 DIR *devpts_dir; 231 232 if (line == NULL) { 233 if ((line = malloc(MALLOCCHUNK)) == NULL) 234 return (0); 235 lbsize = MALLOCCHUNK; 236 } 237 devpts_dir = opendir(_PATH_DEV PTS); 238 if (devpts_dir) { 239 struct dirent *dp; 240 241 while ((dp = readdir(devpts_dir))) { 242 if (strcmp(dp->d_name, ".") != 0 && 243 strcmp(dp->d_name, "..") != 0) { 244 if (atoi(dp->d_name) > maxpts) { 245 maxpts = atoi(dp->d_name); 246 pts_valid = 1; 247 curpts = 0; 248 } 249 } 250 } 251 closedir(devpts_dir); 252 } 253 if (tf) { 254 rewind(tf); 255 return (1); 256 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 257 return (1); 258 return (0); 259 } 260 261 int 262 endttyent() 263 { 264 int rval; 265 266 pts_valid = 0; 267 /* 268 * NB: Don't free `line' because getttynam() 269 * may still be referencing it 270 */ 271 if (tf) { 272 rval = (fclose(tf) != EOF); 273 tf = NULL; 274 return (rval); 275 } 276 return (1); 277 } 278 279 static int 280 isttystat(tty, flag) 281 const char *tty; 282 int flag; 283 { 284 struct ttyent *t; 285 286 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 287 } 288 289 290 int 291 isdialuptty(tty) 292 const char *tty; 293 { 294 295 return isttystat(tty, TTY_DIALUP); 296 } 297 298 int isnettty(tty) 299 const char *tty; 300 { 301 302 return isttystat(tty, TTY_NETWORK); 303 } 304