Commit | Line | Data |
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984263bc MD |
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. | |
0f0f9bbd | 13 | * 3. Neither the name of the University nor the names of its contributors |
984263bc MD |
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 | * | |
2bc1b80e | 29 | * $FreeBSD: src/lib/libc/gen/getttyent.c,v 1.13 2005/07/25 17:57:15 mdodd Exp $ |
1de703da MD |
30 | * |
31 | * @(#)getttyent.c 8.1 (Berkeley) 6/4/93 | |
984263bc MD |
32 | */ |
33 | ||
984263bc MD |
34 | #include <ttyent.h> |
35 | #include <stdio.h> | |
36 | #include <stdlib.h> | |
37 | #include <ctype.h> | |
38 | #include <string.h> | |
f4f08bf8 AH |
39 | #include <dirent.h> |
40 | #include <paths.h> | |
984263bc MD |
41 | |
42 | static char zapchar; | |
43 | static FILE *tf; | |
f4f08bf8 AH |
44 | static int maxpts = -1; |
45 | static int curpts = 0; | |
984263bc MD |
46 | static size_t lbsize; |
47 | static char *line; | |
48 | ||
f4f08bf8 | 49 | #define PTS "pts/" |
984263bc MD |
50 | #define MALLOCCHUNK 100 |
51 | ||
064e1fb3 EN |
52 | static char *skip (char *); |
53 | static char *value (char *); | |
984263bc MD |
54 | |
55 | struct ttyent * | |
0f52d283 | 56 | getttynam(const char *tty) |
984263bc | 57 | { |
e27dad4e | 58 | struct ttyent *t; |
984263bc MD |
59 | |
60 | if (strncmp(tty, "/dev/", 5) == 0) | |
61 | tty += 5; | |
62 | setttyent(); | |
63 | while ( (t = getttyent()) ) | |
64 | if (!strcmp(tty, t->ty_name)) | |
65 | break; | |
66 | endttyent(); | |
67 | return (t); | |
68 | } | |
69 | ||
70 | struct ttyent * | |
0f52d283 | 71 | getttyent(void) |
984263bc MD |
72 | { |
73 | static struct ttyent tty; | |
f4f08bf8 | 74 | static char devpts_name[] = "pts/9999999999"; |
e27dad4e HP |
75 | char *p; |
76 | int c; | |
984263bc MD |
77 | size_t i; |
78 | ||
79 | if (!tf && !setttyent()) | |
80 | return (NULL); | |
81 | for (;;) { | |
f4f08bf8 AH |
82 | if (!fgets(p = line, lbsize, tf)) { |
83 | if (curpts <= maxpts) { | |
84 | sprintf(devpts_name, "pts/%d", curpts++); | |
85 | tty.ty_name = devpts_name; | |
86 | tty.ty_getty = NULL; | |
87 | tty.ty_type = NULL; | |
88 | tty.ty_status = TTY_NETWORK; | |
89 | tty.ty_window = NULL; | |
90 | tty.ty_comment = NULL; | |
91 | tty.ty_group = _TTYS_NOGROUP; | |
92 | return (&tty); | |
93 | } | |
984263bc | 94 | return (NULL); |
f4f08bf8 | 95 | } |
984263bc | 96 | /* extend buffer if line was too big, and retry */ |
2bc1b80e | 97 | while (!index(p, '\n') && !feof(tf)) { |
984263bc MD |
98 | i = strlen(p); |
99 | lbsize += MALLOCCHUNK; | |
100 | if ((p = realloc(line, lbsize)) == NULL) { | |
0f52d283 | 101 | endttyent(); |
984263bc MD |
102 | return (NULL); |
103 | } | |
104 | line = p; | |
105 | if (!fgets(&line[i], lbsize - i, tf)) | |
106 | return (NULL); | |
107 | } | |
108 | while (isspace((unsigned char)*p)) | |
109 | ++p; | |
110 | if (*p && *p != '#') | |
111 | break; | |
112 | } | |
113 | ||
114 | #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) | |
115 | #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' | |
116 | ||
117 | zapchar = 0; | |
118 | tty.ty_name = p; | |
2bc1b80e PA |
119 | tty.ty_status = 0; |
120 | tty.ty_window = NULL; | |
121 | tty.ty_group = _TTYS_NOGROUP; | |
122 | ||
984263bc MD |
123 | p = skip(p); |
124 | if (!*(tty.ty_getty = p)) | |
125 | tty.ty_getty = tty.ty_type = NULL; | |
126 | else { | |
127 | p = skip(p); | |
128 | if (!*(tty.ty_type = p)) | |
129 | tty.ty_type = NULL; | |
130 | else { | |
131 | /* compatibility kludge: handle network/dialup specially */ | |
132 | if (scmp(_TTYS_DIALUP)) | |
133 | tty.ty_status |= TTY_DIALUP; | |
134 | else if (scmp(_TTYS_NETWORK)) | |
135 | tty.ty_status |= TTY_NETWORK; | |
136 | p = skip(p); | |
137 | } | |
138 | } | |
984263bc MD |
139 | |
140 | for (; *p; p = skip(p)) { | |
141 | if (scmp(_TTYS_OFF)) | |
142 | tty.ty_status &= ~TTY_ON; | |
143 | else if (scmp(_TTYS_ON)) | |
144 | tty.ty_status |= TTY_ON; | |
145 | else if (scmp(_TTYS_SECURE)) | |
146 | tty.ty_status |= TTY_SECURE; | |
147 | else if (scmp(_TTYS_INSECURE)) | |
148 | tty.ty_status &= ~TTY_SECURE; | |
149 | else if (scmp(_TTYS_DIALUP)) | |
150 | tty.ty_status |= TTY_DIALUP; | |
151 | else if (scmp(_TTYS_NETWORK)) | |
152 | tty.ty_status |= TTY_NETWORK; | |
fda9d792 MD |
153 | else if (scmp(_TTYS_IFCONSOLE)) |
154 | tty.ty_status |= TTY_IFCONSOLE; | |
f0e61bb7 AL |
155 | else if (scmp(_TTYS_IFEXISTS)) |
156 | tty.ty_status |= TTY_IFEXISTS; | |
984263bc MD |
157 | else if (vcmp(_TTYS_WINDOW)) |
158 | tty.ty_window = value(p); | |
159 | else if (vcmp(_TTYS_GROUP)) | |
160 | tty.ty_group = value(p); | |
161 | else | |
162 | break; | |
163 | } | |
164 | ||
165 | if (zapchar == '#' || *p == '#') | |
166 | while ((c = *++p) == ' ' || c == '\t') | |
167 | ; | |
168 | tty.ty_comment = p; | |
169 | if (*p == 0) | |
170 | tty.ty_comment = 0; | |
171 | if ( (p = index(p, '\n')) ) | |
172 | *p = '\0'; | |
173 | return (&tty); | |
174 | } | |
175 | ||
176 | #define QUOTED 1 | |
177 | ||
178 | /* | |
179 | * Skip over the current field, removing quotes, and return a pointer to | |
180 | * the next field. | |
181 | */ | |
182 | static char * | |
0f52d283 | 183 | skip(char *p) |
984263bc | 184 | { |
e27dad4e HP |
185 | char *t; |
186 | int c, q; | |
984263bc MD |
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 * | |
0f52d283 | 216 | value(char *p) |
984263bc MD |
217 | { |
218 | ||
219 | return ((p = index(p, '=')) ? ++p : NULL); | |
220 | } | |
221 | ||
222 | int | |
0f52d283 | 223 | setttyent(void) |
984263bc | 224 | { |
f4f08bf8 AH |
225 | DIR *devpts_dir; |
226 | struct dirent *dp; | |
227 | int unit; | |
984263bc MD |
228 | |
229 | if (line == NULL) { | |
230 | if ((line = malloc(MALLOCCHUNK)) == NULL) | |
231 | return (0); | |
232 | lbsize = MALLOCCHUNK; | |
233 | } | |
f4f08bf8 AH |
234 | devpts_dir = opendir(_PATH_DEV PTS); |
235 | if (devpts_dir) { | |
236 | maxpts = -1; | |
237 | while ((dp = readdir(devpts_dir))) { | |
238 | if (strcmp(dp->d_name, ".") == 0 || | |
239 | strcmp(dp->d_name, "..") == 0) | |
240 | continue; | |
241 | ||
242 | unit = (int)strtol(dp->d_name, NULL, 10); | |
243 | ||
244 | if (unit > maxpts) { | |
245 | maxpts = unit; | |
246 | curpts = 0; | |
247 | } | |
248 | } | |
249 | closedir(devpts_dir); | |
250 | } | |
984263bc MD |
251 | if (tf) { |
252 | rewind(tf); | |
253 | return (1); | |
254 | } else if ( (tf = fopen(_PATH_TTYS, "r")) ) | |
255 | return (1); | |
256 | return (0); | |
257 | } | |
258 | ||
259 | int | |
0f52d283 | 260 | endttyent(void) |
984263bc MD |
261 | { |
262 | int rval; | |
263 | ||
f4f08bf8 | 264 | maxpts = -1; |
984263bc MD |
265 | /* |
266 | * NB: Don't free `line' because getttynam() | |
267 | * may still be referencing it | |
268 | */ | |
269 | if (tf) { | |
270 | rval = (fclose(tf) != EOF); | |
271 | tf = NULL; | |
272 | return (rval); | |
273 | } | |
274 | return (1); | |
275 | } | |
276 | ||
277 | static int | |
0f52d283 | 278 | isttystat(const char *tty, int flag) |
984263bc | 279 | { |
e27dad4e | 280 | struct ttyent *t; |
984263bc MD |
281 | |
282 | return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); | |
283 | } | |
284 | ||
285 | ||
286 | int | |
0f52d283 | 287 | isdialuptty(const char *tty) |
984263bc MD |
288 | { |
289 | ||
290 | return isttystat(tty, TTY_DIALUP); | |
291 | } | |
292 | ||
0f52d283 SW |
293 | int |
294 | isnettty(const char *tty) | |
984263bc MD |
295 | { |
296 | ||
297 | return isttystat(tty, TTY_NETWORK); | |
298 | } |