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 = -1; 47 static int curpts = 0; 48 static size_t lbsize; 49 static char *line; 50 51 #define PTS "pts/" 52 #define MALLOCCHUNK 100 53 54 static char *skip(char *); 55 static char *value(char *); 56 57 struct ttyent * 58 getttynam(tty) 59 const char *tty; 60 { 61 struct ttyent *t; 62 63 if (strncmp(tty, "/dev/", 5) == 0) 64 tty += 5; 65 setttyent(); 66 while ( (t = getttyent()) ) 67 if (!strcmp(tty, t->ty_name)) 68 break; 69 endttyent(); 70 return (t); 71 } 72 73 struct ttyent * 74 getttyent() 75 { 76 static struct ttyent tty; 77 static char devpts_name[] = "pts/4294967295"; 78 char *p; 79 int c; 80 size_t i; 81 82 if (!tf && !setttyent()) 83 return (NULL); 84 for (;;) { 85 if (!fgets(p = line, lbsize, tf)) { 86 if (curpts <= maxpts) { 87 sprintf(devpts_name, "pts/%d", curpts++); 88 tty.ty_name = devpts_name; 89 tty.ty_getty = tty.ty_type = NULL; 90 tty.ty_status = TTY_NETWORK; 91 tty.ty_window = NULL; 92 tty.ty_comment = NULL; 93 tty.ty_group = _TTYS_NOGROUP; 94 return (&tty); 95 } 96 return (NULL); 97 } 98 /* extend buffer if line was too big, and retry */ 99 while (!index(p, '\n') && !feof(tf)) { 100 i = strlen(p); 101 lbsize += MALLOCCHUNK; 102 if ((p = realloc(line, lbsize)) == NULL) { 103 (void)endttyent(); 104 return (NULL); 105 } 106 line = p; 107 if (!fgets(&line[i], lbsize - i, tf)) 108 return (NULL); 109 } 110 while (isspace((unsigned char)*p)) 111 ++p; 112 if (*p && *p != '#') 113 break; 114 } 115 116 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 117 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 118 119 zapchar = 0; 120 tty.ty_name = p; 121 tty.ty_status = 0; 122 tty.ty_window = NULL; 123 tty.ty_group = _TTYS_NOGROUP; 124 125 p = skip(p); 126 if (!*(tty.ty_getty = p)) 127 tty.ty_getty = tty.ty_type = NULL; 128 else { 129 p = skip(p); 130 if (!*(tty.ty_type = p)) 131 tty.ty_type = NULL; 132 else { 133 /* compatibility kludge: handle network/dialup specially */ 134 if (scmp(_TTYS_DIALUP)) 135 tty.ty_status |= TTY_DIALUP; 136 else if (scmp(_TTYS_NETWORK)) 137 tty.ty_status |= TTY_NETWORK; 138 p = skip(p); 139 } 140 } 141 142 for (; *p; p = skip(p)) { 143 if (scmp(_TTYS_OFF)) 144 tty.ty_status &= ~TTY_ON; 145 else if (scmp(_TTYS_ON)) 146 tty.ty_status |= TTY_ON; 147 else if (scmp(_TTYS_SECURE)) 148 tty.ty_status |= TTY_SECURE; 149 else if (scmp(_TTYS_INSECURE)) 150 tty.ty_status &= ~TTY_SECURE; 151 else if (scmp(_TTYS_DIALUP)) 152 tty.ty_status |= TTY_DIALUP; 153 else if (scmp(_TTYS_NETWORK)) 154 tty.ty_status |= TTY_NETWORK; 155 else if (vcmp(_TTYS_WINDOW)) 156 tty.ty_window = value(p); 157 else if (vcmp(_TTYS_GROUP)) 158 tty.ty_group = value(p); 159 else 160 break; 161 } 162 163 if (zapchar == '#' || *p == '#') 164 while ((c = *++p) == ' ' || c == '\t') 165 ; 166 tty.ty_comment = p; 167 if (*p == 0) 168 tty.ty_comment = 0; 169 if ( (p = index(p, '\n')) ) 170 *p = '\0'; 171 return (&tty); 172 } 173 174 #define QUOTED 1 175 176 /* 177 * Skip over the current field, removing quotes, and return a pointer to 178 * the next field. 179 */ 180 static char * 181 skip(p) 182 char *p; 183 { 184 char *t; 185 int c, q; 186 187 for (q = 0, t = p; (c = *p) != '\0'; p++) { 188 if (c == '"') { 189 q ^= QUOTED; /* obscure, but nice */ 190 continue; 191 } 192 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 193 p++; 194 *t++ = *p; 195 if (q == QUOTED) 196 continue; 197 if (c == '#') { 198 zapchar = c; 199 *p = 0; 200 break; 201 } 202 if (c == '\t' || c == ' ' || c == '\n') { 203 zapchar = c; 204 *p++ = 0; 205 while ((c = *p) == '\t' || c == ' ' || c == '\n') 206 p++; 207 break; 208 } 209 } 210 *--t = '\0'; 211 return (p); 212 } 213 214 static char * 215 value(p) 216 char *p; 217 { 218 219 return ((p = index(p, '=')) ? ++p : NULL); 220 } 221 222 int 223 setttyent() 224 { 225 DIR *devpts_dir; 226 227 if (line == NULL) { 228 if ((line = malloc(MALLOCCHUNK)) == NULL) 229 return (0); 230 lbsize = MALLOCCHUNK; 231 } 232 devpts_dir = opendir(_PATH_DEV PTS); 233 if (devpts_dir) { 234 struct dirent *dp; 235 236 maxpts = -1; 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 curpts = 0; 243 } 244 } 245 } 246 closedir(devpts_dir); 247 } 248 if (tf) { 249 rewind(tf); 250 return (1); 251 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 252 return (1); 253 return (0); 254 } 255 256 int 257 endttyent() 258 { 259 int rval; 260 261 maxpts = -1; 262 /* 263 * NB: Don't free `line' because getttynam() 264 * may still be referencing it 265 */ 266 if (tf) { 267 rval = (fclose(tf) != EOF); 268 tf = NULL; 269 return (rval); 270 } 271 return (1); 272 } 273 274 static int 275 isttystat(tty, flag) 276 const char *tty; 277 int flag; 278 { 279 struct ttyent *t; 280 281 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 282 } 283 284 285 int 286 isdialuptty(tty) 287 const char *tty; 288 { 289 290 return isttystat(tty, TTY_DIALUP); 291 } 292 293 int isnettty(tty) 294 const char *tty; 295 { 296 297 return isttystat(tty, TTY_NETWORK); 298 } 299