Annotation of embedaddon/sudo/src/get_pty.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2009-2011 Todd C. Miller <Todd.Miller@courtesan.com>
3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20: #include <sys/param.h>
21: #include <sys/stat.h>
22: #include <sys/ioctl.h>
23: #ifdef HAVE_SYS_STROPTS_H
24: #include <sys/stropts.h>
25: #endif /* HAVE_SYS_STROPTS_H */
26: #include <stdio.h>
27: #ifdef STDC_HEADERS
28: # include <stdlib.h>
29: # include <stddef.h>
30: #else
31: # ifdef HAVE_STDLIB_H
32: # include <stdlib.h>
33: # endif
34: #endif /* STDC_HEADERS */
35: #ifdef HAVE_STRING_H
36: # include <string.h>
37: #endif /* HAVE_STRING_H */
38: #ifdef HAVE_STRINGS_H
39: # include <strings.h>
40: #endif /* HAVE_STRINGS_H */
41: #ifdef HAVE_UNISTD_H
42: # include <unistd.h>
43: #endif /* HAVE_UNISTD_H */
44: #include <errno.h>
45: #include <fcntl.h>
46: #include <grp.h>
47: #include <pwd.h>
48:
49: #if defined(HAVE_LIBUTIL_H)
50: # include <libutil.h>
51: #elif defined(HAVE_UTIL_H)
52: # include <util.h>
53: #endif
54: #ifdef HAVE_PTY_H
55: # include <pty.h>
56: #endif
57:
58: #include "sudo.h"
59:
60: #if defined(HAVE_OPENPTY)
61: int
62: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
63: {
64: struct group *gr;
65: gid_t ttygid = -1;
66:
67: if ((gr = getgrnam("tty")) != NULL)
68: ttygid = gr->gr_gid;
69:
70: if (openpty(master, slave, name, NULL, NULL) != 0)
71: return 0;
72: if (chown(name, ttyuid, ttygid) != 0)
73: return 0;
74: return 1;
75: }
76:
77: #elif defined(HAVE__GETPTY)
78: int
79: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
80: {
81: char *line;
82:
83: /* IRIX-style dynamic ptys (may fork) */
84: line = _getpty(master, O_RDWR, S_IRUSR|S_IWUSR|S_IWGRP, 0);
85: if (line == NULL)
86: return 0;
87: *slave = open(line, O_RDWR|O_NOCTTY, 0);
88: if (*slave == -1) {
89: close(*master);
90: return 0;
91: }
92: (void) chown(line, ttyuid, -1);
93: strlcpy(name, line, namesz);
94: return 1;
95: }
96: #elif defined(HAVE_GRANTPT)
97: # ifndef HAVE_POSIX_OPENPT
98: static int
99: posix_openpt(int oflag)
100: {
101: int fd;
102:
103: # ifdef _AIX
104: fd = open("/dev/ptc", oflag);
105: # else
106: fd = open("/dev/ptmx", oflag);
107: # endif
108: return fd;
109: }
110: # endif /* HAVE_POSIX_OPENPT */
111:
112: int
113: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
114: {
115: char *line;
116:
117: *master = posix_openpt(O_RDWR|O_NOCTTY);
118: if (*master == -1)
119: return 0;
120:
121: (void) grantpt(*master); /* may fork */
122: if (unlockpt(*master) != 0) {
123: close(*master);
124: return 0;
125: }
126: line = ptsname(*master);
127: if (line == NULL) {
128: close(*master);
129: return 0;
130: }
131: *slave = open(line, O_RDWR|O_NOCTTY, 0);
132: if (*slave == -1) {
133: close(*master);
134: return 0;
135: }
136: # if defined(I_PUSH) && !defined(_AIX)
137: ioctl(*slave, I_PUSH, "ptem"); /* pseudo tty emulation module */
138: ioctl(*slave, I_PUSH, "ldterm"); /* line discipline module */
139: # endif
140: (void) chown(line, ttyuid, -1);
141: strlcpy(name, line, namesz);
142: return 1;
143: }
144:
145: #else /* Old-style BSD ptys */
146:
147: static char line[] = "/dev/ptyXX";
148:
149: int
150: get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
151: {
152: char *bank, *cp;
153: struct group *gr;
154: gid_t ttygid = -1;
155:
156: if ((gr = getgrnam("tty")) != NULL)
157: ttygid = gr->gr_gid;
158:
159: for (bank = "pqrs"; *bank != '\0'; bank++) {
160: line[sizeof("/dev/ptyX") - 2] = *bank;
161: for (cp = "0123456789abcdef"; *cp != '\0'; cp++) {
162: line[sizeof("/dev/ptyXX") - 2] = *cp;
163: *master = open(line, O_RDWR|O_NOCTTY, 0);
164: if (*master == -1) {
165: if (errno == ENOENT)
166: return 0; /* out of ptys */
167: continue; /* already in use */
168: }
169: line[sizeof("/dev/p") - 2] = 't';
170: (void) chown(line, ttyuid, ttygid);
171: (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
172: # ifdef HAVE_REVOKE
173: (void) revoke(line);
174: # endif
175: *slave = open(line, O_RDWR|O_NOCTTY, 0);
176: if (*slave != -1) {
177: strlcpy(name, line, namesz);
178: return 1; /* success */
179: }
180: (void) close(*master);
181: }
182: }
183: return 0;
184: }
185: #endif /* HAVE_OPENPTY */
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