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1 | // This file is part of libptytty. Do not make local modifications. |
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2 | // http://software.schmorp.de/pkg/libptytty |
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3 | |
1 | /*--------------------------------*-C-*---------------------------------* |
4 | /*----------------------------------------------------------------------* |
2 | * File: ptytty.C |
5 | * File: ptytty.C |
3 | *----------------------------------------------------------------------* |
6 | *----------------------------------------------------------------------* |
4 | * |
7 | * |
5 | * All portions of code are copyright by their respective author/s. |
8 | * All portions of code are copyright by their respective author/s. |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
9 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
10 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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11 | * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
8 | * |
12 | * |
9 | * This program is free software; you can redistribute it and/or modify |
13 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
14 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2 of the License, or |
15 | * the Free Software Foundation; either version 2 of the License, or |
12 | * (at your option) any later version. |
16 | * (at your option) any later version. |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
23 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
24 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
26 | *---------------------------------------------------------------------*/ |
23 | |
27 | |
24 | #include "../config.h" /* NECESSARY */ |
28 | #include "../config.h" |
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29 | |
25 | #include "rxvt.h" |
30 | #include "ptytty.h" |
26 | |
31 | |
27 | #include <cstdlib> |
32 | #include <cstdlib> |
28 | #include <cstring> |
33 | #include <cstring> |
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34 | #include <csignal> |
29 | |
35 | |
30 | #include <sys/types.h> |
36 | #include <sys/types.h> |
31 | #include <sys/socket.h> |
37 | #include <sys/socket.h> |
32 | #include <unistd.h> |
38 | #include <unistd.h> |
33 | #include <fcntl.h> |
39 | #include <fcntl.h> |
34 | |
40 | |
35 | #ifdef HAVE_SYS_IOCTL_H |
41 | #ifdef HAVE_SYS_IOCTL_H |
36 | # include <sys/ioctl.h> |
42 | # include <sys/ioctl.h> |
37 | #endif |
43 | #endif |
38 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
44 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
45 | # include <sys/stropts.h> /* for I_PUSH */ |
40 | #endif |
46 | #endif |
41 | #ifdef HAVE_ISASTREAM |
47 | #ifdef HAVE_ISASTREAM |
42 | # include <stropts.h> |
48 | # include <stropts.h> |
43 | #endif |
49 | #endif |
… | |
… | |
46 | #elif defined(HAVE_LIBUTIL_H) |
52 | #elif defined(HAVE_LIBUTIL_H) |
47 | # include <libutil.h> |
53 | # include <libutil.h> |
48 | #elif defined(HAVE_UTIL_H) |
54 | #elif defined(HAVE_UTIL_H) |
49 | # include <util.h> |
55 | # include <util.h> |
50 | #endif |
56 | #endif |
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57 | #ifdef TTY_GID_SUPPORT |
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58 | #include <grp.h> |
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59 | #endif |
51 | |
60 | |
52 | #include <cstdio> |
61 | #include <cstdio> |
53 | #include <grp.h> |
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54 | |
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55 | #include "rxvtutil.h" |
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56 | #include "fdpass.h" |
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57 | #include "ptytty.h" |
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58 | |
62 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
63 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
64 | |
61 | /* ------------------------------------------------------------------------- * |
65 | /* ------------------------------------------------------------------------- * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
… | |
… | |
64 | /* |
68 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
69 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
70 | * If successful, ttydev is set to the name of the slave device. |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
71 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
72 | */ |
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73 | #if defined(UNIX98_PTY) |
69 | static int |
74 | static int |
70 | get_pty (int *fd_tty, char **ttydev) |
75 | get_pty (int *fd_tty, char **ttydev) |
71 | { |
76 | { |
72 | int pfd; |
77 | int pfd; |
73 | |
78 | |
74 | #ifdef PTYS_ARE_OPENPTY |
79 | # if defined(HAVE_GETPT) |
75 | char tty_name[sizeof "/dev/pts/????\0"]; |
80 | pfd = getpt(); |
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81 | # elif defined(HAVE_POSIX_OPENPT) |
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82 | pfd = posix_openpt (O_RDWR); |
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83 | # else |
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84 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
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85 | # endif |
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86 | if (pfd >= 0) |
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87 | { |
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88 | if (grantpt (pfd) == 0 /* change slave permissions */ |
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89 | && unlockpt (pfd) == 0) |
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90 | { /* slave now unlocked */ |
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91 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
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92 | return pfd; |
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93 | } |
76 | |
94 | |
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95 | close (pfd); |
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96 | } |
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97 | |
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98 | return -1; |
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99 | } |
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100 | #elif defined(HAVE_OPENPTY) |
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101 | static int |
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102 | get_pty (int *fd_tty, char **ttydev) |
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103 | { |
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104 | int pfd; |
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105 | int res; |
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106 | char tty_name[32]; |
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107 | |
77 | int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
108 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
78 | |
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79 | if (res != -1) |
109 | if (res != -1) |
80 | { |
110 | { |
81 | *ttydev = strdup (tty_name); |
111 | *ttydev = strdup (tty_name); |
82 | return pfd; |
112 | return pfd; |
83 | } |
113 | } |
84 | #endif |
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85 | |
114 | |
86 | #ifdef PTYS_ARE__GETPTY |
115 | return -1; |
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116 | } |
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117 | #elif defined(HAVE__GETPTY) |
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118 | static int |
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119 | get_pty (int *fd_tty, char **ttydev) |
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120 | { |
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121 | int pfd; |
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122 | |
87 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
88 | if (*ttydev != NULL) |
124 | if (*ttydev != NULL) |
89 | return pfd; |
125 | return pfd; |
90 | #endif |
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91 | |
126 | |
92 | #if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
127 | return -1; |
93 | # if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX) |
128 | } |
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129 | #elif defined(HAVE_DEV_PTC) |
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130 | static int |
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131 | get_pty (int *fd_tty, char **ttydev) |
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132 | { |
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133 | int pfd; |
94 | |
134 | |
95 | { |
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96 | # ifdef PTYS_ARE_GETPT |
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97 | pfd = getpt(); |
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98 | # else |
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99 | # ifdef PTYS_ARE_POSIX |
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100 | pfd = posix_openpt (O_RDWR); |
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101 | # else |
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102 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
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103 | # endif |
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104 | # endif |
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105 | |
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106 | if (pfd >= 0) |
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107 | { |
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108 | if (grantpt (pfd) == 0 /* change slave permissions */ |
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109 | && unlockpt (pfd) == 0) |
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110 | { /* slave now unlocked */ |
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111 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
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112 | return pfd; |
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113 | } |
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114 | close (pfd); |
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115 | } |
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116 | } |
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117 | # endif |
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118 | #endif |
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119 | |
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120 | #ifdef PTYS_ARE_PTC |
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121 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
122 | { |
136 | { |
123 | *ttydev = strdup (ttyname (pfd)); |
137 | *ttydev = strdup (ttyname (pfd)); |
124 | return pfd; |
138 | return pfd; |
125 | } |
139 | } |
126 | #endif |
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127 | |
140 | |
128 | #ifdef PTYS_ARE_CLONE |
141 | return -1; |
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142 | } |
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143 | #elif defined(HAVE_DEV_CLONE) |
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144 | static int |
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145 | get_pty (int *fd_tty, char **ttydev) |
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146 | { |
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147 | int pfd; |
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148 | |
129 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
149 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
130 | { |
150 | { |
131 | *ttydev = strdup (ptsname (pfd)); |
151 | *ttydev = strdup (ptsname (pfd)); |
132 | return pfd; |
152 | return pfd; |
133 | } |
153 | } |
134 | #endif |
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135 | |
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136 | #ifdef PTYS_ARE_NUMERIC |
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137 | { |
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138 | int idx; |
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139 | char *c1, *c2; |
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140 | char pty_name[] = "/dev/ptyp???"; |
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141 | char tty_name[] = "/dev/ttyp???"; |
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142 | |
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143 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
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144 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
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145 | for (idx = 0; idx < 256; idx++) |
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146 | { |
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147 | sprintf (c1, "%d", idx); |
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148 | sprintf (c2, "%d", idx); |
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149 | if (access (tty_name, F_OK) < 0) |
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150 | { |
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151 | idx = 256; |
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152 | break; |
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153 | } |
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154 | |
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155 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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156 | { |
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157 | if (access (tty_name, R_OK | W_OK) == 0) |
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158 | { |
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159 | *ttydev = strdup (tty_name); |
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160 | return pfd; |
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161 | } |
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162 | |
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163 | close (pfd); |
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164 | } |
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165 | } |
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166 | } |
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167 | #endif |
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168 | |
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169 | #ifdef PTYS_ARE_SEARCHED |
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170 | { |
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171 | const char *c1, *c2; |
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172 | char pty_name[] = "/dev/pty??"; |
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173 | char tty_name[] = "/dev/tty??"; |
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174 | |
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175 | # ifndef PTYCHAR1 |
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176 | # define PTYCHAR1 "pqrstuvwxyz" |
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177 | # endif |
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178 | # ifndef PTYCHAR2 |
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179 | # define PTYCHAR2 "0123456789abcdef" |
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180 | # endif |
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181 | |
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182 | for (c1 = PTYCHAR1; *c1; c1++) |
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183 | { |
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184 | pty_name[ (sizeof (pty_name) - 3)] = |
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185 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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186 | for (c2 = PTYCHAR2; *c2; c2++) |
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187 | { |
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188 | pty_name[ (sizeof (pty_name) - 2)] = |
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189 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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190 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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191 | { |
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192 | if (access (tty_name, R_OK | W_OK) == 0) |
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193 | { |
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194 | *ttydev = strdup (tty_name); |
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195 | return pfd; |
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196 | } |
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197 | |
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198 | close (pfd); |
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199 | } |
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200 | } |
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201 | } |
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202 | } |
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203 | #endif |
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204 | |
154 | |
205 | return -1; |
155 | return -1; |
206 | } |
156 | } |
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157 | #else |
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158 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
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159 | static int |
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160 | get_pty (int *fd_tty, char **ttydev) |
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161 | { |
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162 | int pfd; |
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163 | int i; |
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164 | char pty_name[32]; |
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165 | char tty_name[32]; |
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166 | const char *majors = "pqrstuvwxyzabcde"; |
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167 | const char *minors = "0123456789abcdef"; |
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168 | for (i = 0; i < 256; i++) |
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169 | { |
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170 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
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171 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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172 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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173 | { |
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174 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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175 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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176 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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177 | continue; |
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178 | } |
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179 | if (access (tty_name, R_OK | W_OK) == 0) |
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180 | { |
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181 | *ttydev = strdup (tty_name); |
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182 | return pfd; |
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183 | } |
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184 | |
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185 | close (pfd); |
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186 | } |
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187 | } |
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188 | #endif |
207 | |
189 | |
208 | /*----------------------------------------------------------------------*/ |
190 | /*----------------------------------------------------------------------*/ |
209 | /* |
191 | /* |
210 | * Returns tty file descriptor, or -1 on failure |
192 | * Returns tty file descriptor, or -1 on failure |
211 | */ |
193 | */ |
… | |
… | |
220 | * Make our tty a controlling tty so that /dev/tty points to us |
202 | * Make our tty a controlling tty so that /dev/tty points to us |
221 | */ |
203 | */ |
222 | static int |
204 | static int |
223 | control_tty (int fd_tty) |
205 | control_tty (int fd_tty) |
224 | { |
206 | { |
225 | int fd; |
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226 | |
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227 | /* ---------------------------------------- */ |
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228 | setsid (); |
207 | setsid (); |
229 | |
208 | |
230 | /* ---------------------------------------- */ |
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231 | # if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
209 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
232 | /* |
210 | /* |
233 | * Push STREAMS modules: |
211 | * Push STREAMS modules: |
234 | * ptem: pseudo-terminal hardware emulation module. |
212 | * ptem: pseudo-terminal hardware emulation module. |
235 | * ldterm: standard terminal line discipline. |
213 | * ldterm: standard terminal line discipline. |
236 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
214 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
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… | |
244 | * documentation is really unclear about whether it is any close () on |
222 | * documentation is really unclear about whether it is any close () on |
245 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
223 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
246 | * close () - on the master side which causes a hang up to be sent |
224 | * close () - on the master side which causes a hang up to be sent |
247 | * through - Geoff Wing |
225 | * through - Geoff Wing |
248 | */ |
226 | */ |
249 | # ifdef HAVE_ISASTREAM |
227 | # ifdef HAVE_ISASTREAM |
250 | if (isastream (fd_tty) == 1) |
228 | if (isastream (fd_tty) == 1) |
251 | # endif |
229 | # endif |
252 | { |
230 | { |
253 | ioctl (fd_tty, I_PUSH, "ptem"); |
231 | ioctl (fd_tty, I_PUSH, "ptem"); |
254 | ioctl (fd_tty, I_PUSH, "ldterm"); |
232 | ioctl (fd_tty, I_PUSH, "ldterm"); |
255 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
233 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
256 | } |
234 | } |
257 | # endif |
235 | #endif |
258 | /* ---------------------------------------- */ |
236 | |
259 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
237 | ioctl (fd_tty, TIOCSCTTY, NULL); |
260 | /* ---------------------------------------- */ |
238 | |
261 | fd = open ("/dev/tty", O_WRONLY); |
239 | int fd = open ("/dev/tty", O_WRONLY); |
262 | if (fd < 0) |
240 | if (fd < 0) |
263 | return -1; /* fatal */ |
241 | return -1; /* fatal */ |
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242 | |
264 | close (fd); |
243 | close (fd); |
265 | /* ---------------------------------------- */ |
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266 | |
244 | |
267 | return 0; |
245 | return 0; |
268 | } |
246 | } |
269 | |
247 | |
270 | void |
248 | void |
271 | rxvt_ptytty::close_tty () |
249 | ptytty::close_tty () |
272 | { |
250 | { |
273 | if (tty < 0) |
251 | if (tty < 0) |
274 | return; |
252 | return; |
275 | |
253 | |
276 | close (tty); |
254 | close (tty); |
277 | tty = -1; |
255 | tty = -1; |
278 | } |
256 | } |
279 | |
257 | |
280 | bool |
258 | bool |
281 | rxvt_ptytty::make_controlling_tty () |
259 | ptytty::make_controlling_tty () |
282 | { |
260 | { |
283 | return control_tty (tty) >= 0; |
261 | return control_tty (tty) >= 0; |
284 | } |
262 | } |
285 | |
263 | |
286 | void |
264 | void |
287 | rxvt_ptytty::set_utf8_mode (bool on) |
265 | ptytty::set_utf8_mode (bool on) |
288 | { |
266 | { |
289 | #ifdef IUTF8 |
267 | #ifdef IUTF8 |
290 | if (pty < 0) |
268 | if (pty < 0) |
291 | return; |
269 | return; |
292 | |
270 | |
… | |
… | |
308 | } |
286 | } |
309 | } |
287 | } |
310 | #endif |
288 | #endif |
311 | } |
289 | } |
312 | |
290 | |
313 | ///////////////////////////////////////////////////////////////////////////// |
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314 | |
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315 | #ifndef NO_SETOWNER_TTYDEV |
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316 | static struct ttyconf { |
291 | static struct ttyconf { |
317 | gid_t gid; |
292 | gid_t gid; |
318 | mode_t mode; |
293 | mode_t mode; |
319 | |
294 | |
320 | ttyconf () |
295 | ttyconf () |
… | |
… | |
329 | } |
304 | } |
330 | else |
305 | else |
331 | #endif /* TTY_GID_SUPPORT */ |
306 | #endif /* TTY_GID_SUPPORT */ |
332 | { |
307 | { |
333 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
308 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
334 | gid = getgid (); |
309 | gid = 0; |
335 | } |
310 | } |
336 | } |
311 | } |
337 | } ttyconf; |
312 | } ttyconf; |
338 | |
313 | |
339 | ///////////////////////////////////////////////////////////////////////////// |
314 | ptytty_unix::ptytty_unix () |
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315 | { |
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316 | name = 0; |
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317 | #if UTMP_SUPPORT |
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318 | cmd_pid = 0; |
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319 | #endif |
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320 | } |
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321 | |
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322 | ptytty_unix::~ptytty_unix () |
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323 | { |
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324 | #if UTMP_SUPPORT |
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325 | logout (); |
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326 | #endif |
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327 | put (); |
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328 | } |
340 | |
329 | |
341 | void |
330 | void |
342 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
331 | ptytty_unix::put () |
343 | { |
332 | { |
344 | if (!name || !*name) |
333 | chmod (name, RESTORE_TTY_MODE); |
345 | return; |
334 | chown (name, 0, ttyconf.gid); |
346 | |
335 | |
347 | if (action == SAVE) |
336 | close_tty (); |
348 | { |
|
|
349 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
350 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
|
|
351 | if (lstat (name, &savestat) < 0) /* you lose out */ |
|
|
352 | ; |
|
|
353 | else |
|
|
354 | # endif |
|
|
355 | { |
|
|
356 | saved = true; |
|
|
357 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
358 | chmod (name, ttyconf.mode); |
|
|
359 | # ifdef HAVE_REVOKE |
|
|
360 | revoke (name); |
|
|
361 | # endif |
|
|
362 | } |
|
|
363 | } |
|
|
364 | else |
|
|
365 | { /* action == RESTORE */ |
|
|
366 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
367 | if (saved) |
|
|
368 | { |
|
|
369 | chmod (name, savestat.st_mode); |
|
|
370 | chown (name, savestat.st_uid, savestat.st_gid); |
|
|
371 | } |
|
|
372 | # else |
|
|
373 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
|
|
374 | chown (name, 0, 0); |
|
|
375 | # endif |
|
|
376 | |
337 | |
377 | } |
338 | if (pty >= 0) |
378 | } |
339 | close (pty); |
379 | #endif |
|
|
380 | |
340 | |
381 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
341 | free (name); |
382 | { |
342 | |
383 | pty = tty = -1; |
343 | pty = tty = -1; |
384 | name = 0; |
344 | name = 0; |
385 | #ifndef NO_SETOWNER_TTYDEV |
|
|
386 | saved = false; |
|
|
387 | #endif |
|
|
388 | #if UTMP_SUPPORT |
|
|
389 | cmd_pid = 0; |
|
|
390 | #endif |
|
|
391 | } |
|
|
392 | |
|
|
393 | rxvt_ptytty_unix::~rxvt_ptytty_unix () |
|
|
394 | { |
|
|
395 | logout (); |
|
|
396 | put (); |
|
|
397 | } |
|
|
398 | |
|
|
399 | void |
|
|
400 | rxvt_ptytty_unix::put () |
|
|
401 | { |
|
|
402 | #ifndef NO_SETOWNER_TTYDEV |
|
|
403 | privileges (RESTORE); |
|
|
404 | #endif |
|
|
405 | |
|
|
406 | if (pty >= 0) close (pty); |
|
|
407 | close_tty (); |
|
|
408 | free (name); |
|
|
409 | |
|
|
410 | pty = tty = -1; |
|
|
411 | name = 0; |
|
|
412 | } |
345 | } |
413 | |
346 | |
414 | bool |
347 | bool |
415 | rxvt_ptytty_unix::get () |
348 | ptytty_unix::get () |
416 | { |
349 | { |
417 | /* get master (pty) */ |
350 | /* get master (pty) */ |
418 | if ((pty = get_pty (&tty, &name)) < 0) |
351 | if ((pty = get_pty (&tty, &name)) < 0) |
419 | return false; |
352 | return false; |
420 | |
353 | |
… | |
… | |
422 | |
355 | |
423 | /* get slave (tty) */ |
356 | /* get slave (tty) */ |
424 | if (tty < 0) |
357 | if (tty < 0) |
425 | { |
358 | { |
426 | #ifndef NO_SETOWNER_TTYDEV |
359 | #ifndef NO_SETOWNER_TTYDEV |
427 | privileges (SAVE); |
360 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
361 | chmod (name, ttyconf.mode); |
|
|
362 | # ifdef HAVE_REVOKE |
|
|
363 | revoke (name); |
|
|
364 | # endif |
428 | #endif |
365 | #endif |
429 | |
366 | |
430 | if ((tty = get_tty (name)) < 0) |
367 | if ((tty = get_tty (name)) < 0) |
431 | { |
368 | { |
432 | put (); |
369 | put (); |
… | |
… | |
435 | } |
372 | } |
436 | |
373 | |
437 | return true; |
374 | return true; |
438 | } |
375 | } |
439 | |
376 | |
|
|
377 | ///////////////////////////////////////////////////////////////////////////// |
|
|
378 | // helper/proxy support |
|
|
379 | |
440 | #if PTYTTY_HELPER |
380 | #if PTYTTY_HELPER |
441 | |
381 | |
442 | static int sock_fd; |
382 | static int sock_fd = -1, lock_fd = -1; |
443 | static int pid; |
383 | static int helper_pid, owner_pid; |
444 | |
384 | |
445 | struct command |
385 | struct command |
446 | { |
386 | { |
447 | enum { get, login, destroy } type; |
387 | enum { get, login, destroy } type; |
448 | |
388 | |
449 | rxvt_ptytty *id; |
389 | ptytty *id; |
450 | |
390 | |
451 | bool login_shell; |
391 | bool login_shell; |
452 | int cmd_pid; |
392 | int cmd_pid; |
453 | char hostname[512]; // arbitrary, but should be plenty |
393 | char hostname[512]; // arbitrary, but should be plenty |
454 | }; |
394 | }; |
455 | |
395 | |
456 | struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
396 | struct ptytty_proxy : ptytty |
457 | { |
397 | { |
458 | rxvt_ptytty *id; |
398 | ptytty *id; |
459 | |
399 | |
|
|
400 | ptytty_proxy () |
|
|
401 | : id(0) |
|
|
402 | { |
|
|
403 | } |
|
|
404 | |
460 | ~rxvt_ptytty_proxy (); |
405 | ~ptytty_proxy (); |
461 | |
406 | |
462 | bool get (); |
407 | bool get (); |
463 | void login (int cmd_pid, bool login_shell, const char *hostname); |
408 | void login (int cmd_pid, bool login_shell, const char *hostname); |
464 | }; |
409 | }; |
465 | |
410 | |
|
|
411 | #if PTYTTY_REENTRANT |
|
|
412 | # define NEED_TOKEN do { char ch; read (lock_fd, &ch, 1); } while (0) |
|
|
413 | # define GIVE_TOKEN do { char ch; write (lock_fd, &ch, 1); } while (0) |
|
|
414 | #else |
|
|
415 | # define NEED_TOKEN (void)0 |
|
|
416 | # define GIVE_TOKEN (void)0 |
|
|
417 | #endif |
|
|
418 | |
466 | bool |
419 | bool |
467 | rxvt_ptytty_proxy::get () |
420 | ptytty_proxy::get () |
468 | { |
421 | { |
|
|
422 | NEED_TOKEN; |
|
|
423 | |
469 | command cmd; |
424 | command cmd; |
470 | |
425 | |
471 | cmd.type = command::get; |
426 | cmd.type = command::get; |
472 | |
427 | |
473 | write (sock_fd, &cmd, sizeof (cmd)); |
428 | write (sock_fd, &cmd, sizeof (cmd)); |
474 | |
429 | |
475 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
430 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
476 | rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
431 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
477 | |
432 | |
478 | if (!id) |
433 | if (!id) |
|
|
434 | { |
|
|
435 | GIVE_TOKEN; |
479 | return false; |
436 | return false; |
|
|
437 | } |
480 | |
438 | |
481 | if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
439 | if ((pty = recv_fd (sock_fd)) < 0 |
482 | || (tty = rxvt_recv_fd (sock_fd)) < 0) |
440 | || (tty = recv_fd (sock_fd)) < 0) |
483 | rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
441 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
484 | |
442 | |
|
|
443 | GIVE_TOKEN; |
485 | return true; |
444 | return true; |
486 | } |
445 | } |
487 | |
446 | |
488 | void |
447 | void |
489 | rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
448 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
490 | { |
449 | { |
|
|
450 | NEED_TOKEN; |
|
|
451 | |
491 | command cmd; |
452 | command cmd; |
492 | |
453 | |
493 | cmd.type = command::login; |
454 | cmd.type = command::login; |
494 | cmd.id = id; |
455 | cmd.id = id; |
495 | cmd.cmd_pid = cmd_pid; |
456 | cmd.cmd_pid = cmd_pid; |
496 | cmd.login_shell = login_shell; |
457 | cmd.login_shell = login_shell; |
497 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
458 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
498 | |
459 | |
499 | write (sock_fd, &cmd, sizeof (cmd)); |
460 | write (sock_fd, &cmd, sizeof (cmd)); |
500 | } |
|
|
501 | |
461 | |
|
|
462 | GIVE_TOKEN; |
|
|
463 | } |
|
|
464 | |
502 | rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
465 | ptytty_proxy::~ptytty_proxy () |
503 | { |
466 | { |
|
|
467 | if (id) |
|
|
468 | { |
|
|
469 | NEED_TOKEN; |
|
|
470 | |
504 | command cmd; |
471 | command cmd; |
505 | |
472 | |
506 | cmd.type = command::destroy; |
473 | cmd.type = command::destroy; |
507 | cmd.id = id; |
474 | cmd.id = id; |
508 | |
475 | |
509 | write (sock_fd, &cmd, sizeof (cmd)); |
476 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
477 | |
|
|
478 | GIVE_TOKEN; |
|
|
479 | } |
510 | } |
480 | } |
511 | |
481 | |
512 | static |
482 | static |
513 | void serve () |
483 | void serve () |
514 | { |
484 | { |
515 | command cmd; |
485 | command cmd; |
516 | vector<rxvt_ptytty *> ptys; |
486 | vector<ptytty *> ptys; |
517 | |
487 | |
|
|
488 | for (;;) |
|
|
489 | { |
|
|
490 | GIVE_TOKEN; |
|
|
491 | |
518 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
492 | if (read (sock_fd, &cmd, sizeof (command)) != sizeof (command)) |
519 | { |
493 | break; |
|
|
494 | |
520 | if (cmd.type == command::get) |
495 | if (cmd.type == command::get) |
521 | { |
496 | { |
522 | // -> id ptyfd ttyfd |
497 | // -> id ptyfd ttyfd |
523 | cmd.id = new rxvt_ptytty_unix; |
498 | cmd.id = new ptytty_unix; |
524 | |
499 | |
525 | if (cmd.id->get ()) |
500 | if (cmd.id->get ()) |
526 | { |
501 | { |
527 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
502 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
528 | ptys.push_back (cmd.id); |
503 | ptys.push_back (cmd.id); |
529 | |
504 | |
530 | rxvt_send_fd (sock_fd, cmd.id->pty); |
505 | ptytty::send_fd (sock_fd, cmd.id->pty); |
531 | rxvt_send_fd (sock_fd, cmd.id->tty); |
506 | ptytty::send_fd (sock_fd, cmd.id->tty); |
532 | } |
507 | } |
533 | else |
508 | else |
534 | { |
509 | { |
535 | delete cmd.id; |
510 | delete cmd.id; |
536 | cmd.id = 0; |
511 | cmd.id = 0; |
537 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
512 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
538 | } |
513 | } |
539 | } |
514 | } |
540 | else if (cmd.type == command::login) |
515 | else if (cmd.type == command::login) |
541 | { |
516 | { |
|
|
517 | #if UTMP_SUPPORT |
542 | if (find (ptys.begin (), ptys.end (), cmd.id)) |
518 | if (find (ptys.begin (), ptys.end (), cmd.id) != ptys.end ()) |
543 | { |
519 | { |
544 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
520 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
545 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
521 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
546 | } |
522 | } |
|
|
523 | #endif |
547 | } |
524 | } |
548 | else if (cmd.type == command::destroy) |
525 | else if (cmd.type == command::destroy) |
549 | { |
526 | { |
550 | rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
527 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
551 | |
528 | |
552 | if (*pty) |
529 | if (pty != ptys.end ()) |
553 | { |
530 | { |
|
|
531 | delete *pty; |
554 | ptys.erase (pty); |
532 | ptys.erase (pty); |
555 | delete *pty; |
|
|
556 | } |
533 | } |
557 | } |
534 | } |
558 | else |
535 | else |
559 | break; |
536 | break; |
|
|
537 | |
|
|
538 | NEED_TOKEN; |
560 | } |
539 | } |
561 | |
540 | |
562 | // destroy all ptys |
541 | // destroy all ptys |
563 | for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
542 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
564 | delete *i; |
543 | delete *i; |
565 | } |
544 | } |
566 | |
545 | |
567 | void rxvt_ptytty_server () |
546 | void |
|
|
547 | ptytty::use_helper () |
568 | { |
548 | { |
|
|
549 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
550 | int pid = getpid (); |
|
|
551 | #endif |
|
|
552 | |
|
|
553 | if (sock_fd >= 0 |
|
|
554 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
555 | && pid == owner_pid |
|
|
556 | #endif |
|
|
557 | ) |
|
|
558 | return; |
|
|
559 | |
|
|
560 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
561 | owner_pid = pid; |
|
|
562 | #endif |
|
|
563 | |
569 | int sv[2]; |
564 | int sv[2]; |
570 | |
565 | |
571 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
566 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
572 | rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
567 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
573 | |
568 | |
|
|
569 | #ifdef PTYTTY_REENTRANT |
|
|
570 | int lv[2]; |
|
|
571 | |
|
|
572 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, lv)) |
|
|
573 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
574 | #endif |
|
|
575 | |
574 | pid = fork (); |
576 | helper_pid = fork (); |
575 | |
577 | |
576 | if (pid < 0) |
578 | if (helper_pid < 0) |
577 | rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
579 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
578 | |
580 | |
579 | if (pid) |
581 | if (helper_pid) |
580 | { |
582 | { |
581 | // client, urxvt |
583 | // client, process |
582 | sock_fd = sv[0]; |
584 | sock_fd = sv[0]; |
583 | close (sv[1]); |
585 | close (sv[1]); |
584 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
586 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
587 | #ifdef PTYTTY_REENTRANT |
|
|
588 | lock_fd = lv[0]; |
|
|
589 | close (lv[1]); |
|
|
590 | fcntl (lock_fd, F_SETFD, FD_CLOEXEC); |
|
|
591 | #endif |
585 | } |
592 | } |
586 | else |
593 | else |
587 | { |
594 | { |
588 | setgid (getegid ()); |
|
|
589 | setuid (geteuid ()); |
|
|
590 | |
|
|
591 | // server, pty-helper |
595 | // server, pty-helper |
592 | sock_fd = sv[1]; |
596 | sock_fd = sv[1]; |
|
|
597 | #ifdef PTYTTY_REENTRANT |
|
|
598 | lock_fd = lv[1]; |
|
|
599 | #endif |
|
|
600 | |
|
|
601 | chdir ("/"); |
|
|
602 | |
|
|
603 | signal (SIGHUP, SIG_IGN); |
|
|
604 | signal (SIGTERM, SIG_IGN); |
|
|
605 | signal (SIGINT, SIG_IGN); |
|
|
606 | signal (SIGPIPE, SIG_IGN); |
593 | |
607 | |
594 | for (int fd = 0; fd < 1023; fd++) |
608 | for (int fd = 0; fd < 1023; fd++) |
595 | if (fd != sock_fd) |
609 | if (fd != sock_fd && fd != lock_fd) |
596 | close (fd); |
610 | close (fd); |
597 | |
611 | |
598 | serve (); |
612 | serve (); |
599 | _exit (EXIT_SUCCESS); |
613 | _exit (EXIT_SUCCESS); |
600 | } |
614 | } |
601 | } |
615 | } |
602 | #endif |
|
|
603 | |
616 | |
604 | // a "factory" *g* |
617 | #endif |
|
|
618 | |
605 | rxvt_ptytty * |
619 | ptytty * |
606 | rxvt_new_ptytty () |
620 | ptytty::create () |
607 | { |
621 | { |
608 | #if PTYTTY_HELPER |
622 | #if PTYTTY_HELPER |
609 | if (pid > 0) |
623 | if (helper_pid |
|
|
624 | # ifndef PTYTTY_NO_PID_CHECK |
|
|
625 | && getpid () == owner_pid |
|
|
626 | # endif |
|
|
627 | ) |
610 | // use helper process |
628 | // use helper process |
611 | return new rxvt_ptytty_proxy; |
629 | return new ptytty_proxy; |
612 | else |
630 | else |
613 | #endif |
631 | #endif |
614 | return new rxvt_ptytty_unix; |
632 | return new ptytty_unix; |
615 | } |
633 | } |
616 | |
634 | |
617 | /*----------------------- end-of-file (C source) -----------------------*/ |
635 | void |
|
|
636 | ptytty::init () |
|
|
637 | { |
|
|
638 | uid_t uid = getuid (); |
|
|
639 | gid_t gid = getgid (); |
|
|
640 | |
|
|
641 | // before doing anything else, check for setuid/setgid operation, |
|
|
642 | // start the helper process and drop privileges |
|
|
643 | if (uid != geteuid () |
|
|
644 | || gid != getegid ()) |
|
|
645 | { |
|
|
646 | #if PTYTTY_HELPER |
|
|
647 | use_helper (); |
|
|
648 | #else |
|
|
649 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
|
|
650 | #endif |
618 | |
651 | |
|
|
652 | drop_privileges (); |
|
|
653 | } |
|
|
654 | } |
|
|
655 | |
|
|
656 | void |
|
|
657 | ptytty::drop_privileges () |
|
|
658 | { |
|
|
659 | uid_t uid = getuid (); |
|
|
660 | gid_t gid = getgid (); |
|
|
661 | |
|
|
662 | // drop privileges |
|
|
663 | #if HAVE_SETRESUID |
|
|
664 | setresgid (gid, gid, gid); |
|
|
665 | setresuid (uid, uid, uid); |
|
|
666 | #elif HAVE_SETREUID |
|
|
667 | setregid (gid, gid); |
|
|
668 | setreuid (uid, uid); |
|
|
669 | #elif HAVE_SETUID |
|
|
670 | setgid (gid); |
|
|
671 | setuid (uid); |
|
|
672 | #endif |
|
|
673 | |
|
|
674 | if (uid != geteuid () |
|
|
675 | || gid != getegid ()) |
|
|
676 | ptytty_fatal ("unable to drop privileges, aborting.\n"); |
|
|
677 | } |
|
|
678 | |
|
|
679 | ///////////////////////////////////////////////////////////////////////////// |
|
|
680 | // C API |
|
|
681 | |
|
|
682 | #ifndef PTYTTY_NO_C_API |
|
|
683 | |
|
|
684 | typedef void *PTYTTY; |
|
|
685 | |
|
|
686 | #define DEFINE_METHOD(retval, name, args1, args2) \ |
|
|
687 | extern "C" retval ptytty_ ## name args1 \ |
|
|
688 | { return ((struct ptytty *)ptytty)->name args2; } |
|
|
689 | |
|
|
690 | DEFINE_METHOD(int,pty,(PTYTTY ptytty),) |
|
|
691 | DEFINE_METHOD(int,tty,(PTYTTY ptytty),) |
|
|
692 | DEFINE_METHOD(int,get,(PTYTTY ptytty),()) |
|
|
693 | DEFINE_METHOD(void,login,(PTYTTY ptytty, int cmd_pid, bool login_shell, const char *hostname),(cmd_pid,login_shell,hostname)) |
|
|
694 | |
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695 | DEFINE_METHOD(void,close_tty,(PTYTTY ptytty),()) |
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696 | DEFINE_METHOD(int,make_controlling_tty,(PTYTTY ptytty),()) |
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697 | DEFINE_METHOD(void,set_utf8_mode,(PTYTTY ptytty, int on),(on)) |
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698 | |
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699 | #define DEFINE_STATIC(retval, name, args) \ |
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700 | extern "C" retval ptytty_ ## name args \ |
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701 | { return ptytty::name args; } |
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702 | |
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703 | DEFINE_STATIC(void,drop_privileges,()) |
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704 | DEFINE_STATIC(void,use_helper,()) |
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705 | DEFINE_STATIC(void,init,()) |
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706 | |
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707 | DEFINE_STATIC(PTYTTY ,create,()) |
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708 | |
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709 | void ptytty_delete (PTYTTY ptytty) |
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710 | { |
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711 | delete (struct ptytty *)ptytty; |
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712 | } |
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713 | |
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714 | // send_fd, recv_fd not exposed |
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715 | |
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716 | #endif |