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