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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> |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
22 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
23 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
25 | *---------------------------------------------------------------------*/ |
23 | |
26 | |
24 | #include "../config.h" /* NECESSARY */ |
27 | #include "../config.h" |
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28 | |
25 | #include "rxvt.h" |
29 | #include "ptytty.h" |
26 | |
30 | |
27 | # include <cstdlib> |
31 | #include <cstdlib> |
28 | # include <cstring> |
32 | #include <cstring> |
29 | |
33 | |
30 | #ifdef HAVE_SYS_TYPES_H |
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31 | # include <sys/types.h> |
34 | #include <sys/types.h> |
32 | #endif |
35 | #include <sys/socket.h> |
33 | #ifdef HAVE_UNISTD_H |
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34 | # include <unistd.h> |
36 | #include <unistd.h> |
35 | #endif |
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36 | #ifdef HAVE_FCNTL_H |
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37 | # include <fcntl.h> |
37 | #include <fcntl.h> |
38 | #endif |
38 | |
39 | #ifdef HAVE_SYS_IOCTL_H |
39 | #ifdef HAVE_SYS_IOCTL_H |
40 | # include <sys/ioctl.h> |
40 | # include <sys/ioctl.h> |
41 | #endif |
41 | #endif |
42 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
42 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
43 | # include <sys/stropts.h> /* for I_PUSH */ |
43 | # include <sys/stropts.h> /* for I_PUSH */ |
44 | #endif |
44 | #endif |
45 | #ifdef HAVE_ISASTREAM |
45 | #ifdef HAVE_ISASTREAM |
46 | # include <stropts.h> |
46 | # include <stropts.h> |
47 | #endif |
47 | #endif |
… | |
… | |
50 | #elif defined(HAVE_LIBUTIL_H) |
50 | #elif defined(HAVE_LIBUTIL_H) |
51 | # include <libutil.h> |
51 | # include <libutil.h> |
52 | #elif defined(HAVE_UTIL_H) |
52 | #elif defined(HAVE_UTIL_H) |
53 | # include <util.h> |
53 | # include <util.h> |
54 | #endif |
54 | #endif |
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55 | #ifdef TTY_GID_SUPPORT |
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56 | #include <grp.h> |
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57 | #endif |
55 | |
58 | |
56 | #include <cstdio> |
59 | #include <cstdio> |
57 | #include <grp.h> |
60 | |
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61 | ///////////////////////////////////////////////////////////////////////////// |
58 | |
62 | |
59 | /* ------------------------------------------------------------------------- * |
63 | /* ------------------------------------------------------------------------- * |
60 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
64 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
61 | * ------------------------------------------------------------------------- */ |
65 | * ------------------------------------------------------------------------- */ |
62 | /* |
66 | /* |
63 | * Returns pty file descriptor, or -1 on failure |
67 | * Returns pty file descriptor, or -1 on failure |
64 | * If successful, ttydev is set to the name of the slave device. |
68 | * If successful, ttydev is set to the name of the slave device. |
65 | * fd_tty _may_ also be set to an open fd to the slave device |
69 | * fd_tty _may_ also be set to an open fd to the slave device |
66 | */ |
70 | */ |
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71 | #if defined(UNIX98_PTY) |
67 | static int |
72 | static int |
68 | get_pty (int *fd_tty, char **ttydev) |
73 | get_pty (int *fd_tty, char **ttydev) |
69 | { |
74 | { |
70 | int pfd; |
75 | int pfd; |
71 | |
76 | |
72 | #ifdef PTYS_ARE_OPENPTY |
77 | # if defined(HAVE_GETPT) |
73 | char tty_name[sizeof "/dev/pts/????\0"]; |
78 | pfd = getpt(); |
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79 | # elif defined(HAVE_POSIX_OPENPT) |
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80 | pfd = posix_openpt (O_RDWR); |
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81 | # else |
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82 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
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83 | # endif |
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84 | if (pfd >= 0) |
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85 | { |
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86 | if (grantpt (pfd) == 0 /* change slave permissions */ |
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87 | && unlockpt (pfd) == 0) |
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88 | { /* slave now unlocked */ |
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89 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
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90 | return pfd; |
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91 | } |
74 | |
92 | |
75 | rxvt_privileges(RESTORE); |
93 | close (pfd); |
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94 | } |
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95 | |
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96 | return -1; |
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97 | } |
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98 | #elif defined(HAVE_OPENPTY) |
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99 | static int |
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100 | get_pty (int *fd_tty, char **ttydev) |
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101 | { |
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102 | int pfd; |
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103 | int res; |
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104 | char tty_name[32]; |
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105 | |
76 | int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
77 | rxvt_privileges(IGNORE); |
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78 | |
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79 | if (res != -1) |
107 | if (res != -1) |
80 | { |
108 | { |
81 | *ttydev = strdup (tty_name); |
109 | *ttydev = strdup (tty_name); |
82 | return pfd; |
110 | return pfd; |
83 | } |
111 | } |
84 | #endif |
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85 | |
112 | |
86 | #ifdef PTYS_ARE__GETPTY |
113 | return -1; |
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114 | } |
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115 | #elif defined(HAVE__GETPTY) |
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116 | static int |
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117 | get_pty (int *fd_tty, char **ttydev) |
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118 | { |
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119 | int pfd; |
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120 | |
87 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
121 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
88 | if (*ttydev != NULL) |
122 | if (*ttydev != NULL) |
89 | return pfd; |
123 | return pfd; |
90 | #endif |
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91 | |
124 | |
92 | #if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
125 | return -1; |
93 | # if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX) |
126 | } |
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127 | #elif defined(HAVE_DEV_PTC) |
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128 | static int |
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129 | get_pty (int *fd_tty, char **ttydev) |
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130 | { |
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131 | int pfd; |
94 | |
132 | |
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) |
133 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
122 | { |
134 | { |
123 | *ttydev = strdup (ttyname (pfd)); |
135 | *ttydev = strdup (ttyname (pfd)); |
124 | return pfd; |
136 | return pfd; |
125 | } |
137 | } |
126 | #endif |
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127 | |
138 | |
128 | #ifdef PTYS_ARE_CLONE |
139 | return -1; |
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140 | } |
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141 | #elif defined(HAVE_DEV_CLONE) |
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142 | static int |
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143 | get_pty (int *fd_tty, char **ttydev) |
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144 | { |
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145 | int pfd; |
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146 | |
129 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
147 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
130 | { |
148 | { |
131 | *ttydev = strdup (ptsname (pfd)); |
149 | *ttydev = strdup (ptsname (pfd)); |
132 | return pfd; |
150 | return pfd; |
133 | } |
151 | } |
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 | |
152 | |
205 | return -1; |
153 | return -1; |
206 | } |
154 | } |
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155 | #else |
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156 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
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157 | static int |
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158 | get_pty (int *fd_tty, char **ttydev) |
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159 | { |
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160 | int pfd; |
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161 | int i; |
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162 | char pty_name[32]; |
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163 | char tty_name[32]; |
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164 | const char *majors = "pqrstuvwxyzabcde"; |
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165 | const char *minors = "0123456789abcdef"; |
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166 | for (i = 0; i < 256; i++) |
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167 | { |
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168 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
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169 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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170 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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171 | { |
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172 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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173 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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174 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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175 | continue; |
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176 | } |
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177 | if (access (tty_name, R_OK | W_OK) == 0) |
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178 | { |
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179 | *ttydev = strdup (tty_name); |
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180 | return pfd; |
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181 | } |
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182 | |
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183 | close (pfd); |
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184 | } |
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185 | } |
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186 | #endif |
207 | |
187 | |
208 | /*----------------------------------------------------------------------*/ |
188 | /*----------------------------------------------------------------------*/ |
209 | /* |
189 | /* |
210 | * Returns tty file descriptor, or -1 on failure |
190 | * Returns tty file descriptor, or -1 on failure |
211 | */ |
191 | */ |
… | |
… | |
218 | /*----------------------------------------------------------------------*/ |
198 | /*----------------------------------------------------------------------*/ |
219 | /* |
199 | /* |
220 | * Make our tty a controlling tty so that /dev/tty points to us |
200 | * Make our tty a controlling tty so that /dev/tty points to us |
221 | */ |
201 | */ |
222 | static int |
202 | static int |
223 | control_tty (int fd_tty, const char *ttydev) |
203 | control_tty (int fd_tty) |
224 | { |
204 | { |
225 | #ifndef __QNX__ |
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226 | int fd; |
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227 | |
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228 | /* ---------------------------------------- */ |
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229 | # ifdef HAVE_SETSID |
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230 | setsid (); |
205 | setsid (); |
231 | # endif |
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232 | # if defined(HAVE_SETPGID) |
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233 | setpgid (0, 0); |
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234 | # elif defined(HAVE_SETPGRP) |
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235 | setpgrp (0, 0); |
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236 | # endif |
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237 | |
206 | |
238 | /* ---------------------------------------- */ |
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239 | # ifdef TIOCNOTTY |
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240 | fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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241 | if (fd >= 0) |
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242 | { |
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243 | ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */ |
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244 | close (fd); |
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245 | } |
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246 | # endif |
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247 | |
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248 | /* ---------------------------------------- */ |
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249 | fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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250 | if (fd >= 0) |
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251 | close (fd); /* ouch: still have controlling tty */ |
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252 | |
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253 | /* ---------------------------------------- */ |
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254 | #if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
207 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
255 | /* |
208 | /* |
256 | * Push STREAMS modules: |
209 | * Push STREAMS modules: |
257 | * ptem: pseudo-terminal hardware emulation module. |
210 | * ptem: pseudo-terminal hardware emulation module. |
258 | * ldterm: standard terminal line discipline. |
211 | * ldterm: standard terminal line discipline. |
259 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
212 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
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276 | ioctl (fd_tty, I_PUSH, "ptem"); |
229 | ioctl (fd_tty, I_PUSH, "ptem"); |
277 | ioctl (fd_tty, I_PUSH, "ldterm"); |
230 | ioctl (fd_tty, I_PUSH, "ldterm"); |
278 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
231 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
279 | } |
232 | } |
280 | #endif |
233 | #endif |
281 | /* ---------------------------------------- */ |
234 | |
282 | # if defined(TIOCSCTTY) |
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283 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
235 | ioctl (fd_tty, TIOCSCTTY, NULL); |
284 | # elif defined(TIOCSETCTTY) |
236 | |
285 | fd = ioctl (fd_tty, TIOCSETCTTY, NULL); |
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286 | # else |
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287 | fd = open (ttydev, O_RDWR); |
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288 | if (fd >= 0) |
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289 | close (fd); |
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290 | # endif |
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291 | /* ---------------------------------------- */ |
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292 | fd = open ("/dev/tty", O_WRONLY); |
237 | int fd = open ("/dev/tty", O_WRONLY); |
293 | if (fd < 0) |
238 | if (fd < 0) |
294 | return -1; /* fatal */ |
239 | return -1; /* fatal */ |
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240 | |
295 | close (fd); |
241 | close (fd); |
296 | /* ---------------------------------------- */ |
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297 | #endif /* ! __QNX__ */ |
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298 | |
242 | |
299 | return 0; |
243 | return 0; |
300 | } |
244 | } |
301 | |
245 | |
302 | #ifndef NO_SETOWNER_TTYDEV |
246 | void |
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247 | ptytty::close_tty () |
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248 | { |
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249 | if (tty < 0) |
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250 | return; |
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251 | |
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252 | close (tty); |
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253 | tty = -1; |
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254 | } |
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255 | |
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256 | bool |
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257 | ptytty::make_controlling_tty () |
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258 | { |
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259 | return control_tty (tty) >= 0; |
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260 | } |
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261 | |
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262 | void |
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263 | ptytty::set_utf8_mode (bool on) |
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264 | { |
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265 | #ifdef IUTF8 |
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266 | if (pty < 0) |
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267 | return; |
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268 | |
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269 | struct termios tio; |
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270 | |
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271 | if (tcgetattr (pty, &tio) != -1) |
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272 | { |
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273 | tcflag_t new_cflag = tio.c_iflag; |
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274 | |
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275 | if (on) |
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276 | new_cflag |= IUTF8; |
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277 | else |
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278 | new_cflag &= ~IUTF8; |
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279 | |
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280 | if (new_cflag != tio.c_iflag) |
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281 | { |
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282 | tio.c_iflag = new_cflag; |
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283 | tcsetattr (pty, TCSANOW, &tio); |
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284 | } |
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285 | } |
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286 | #endif |
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287 | } |
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288 | |
303 | static struct ttyconf { |
289 | static struct ttyconf { |
304 | gid_t gid; |
290 | gid_t gid; |
305 | mode_t mode; |
291 | mode_t mode; |
306 | |
292 | |
307 | ttyconf () |
293 | ttyconf () |
… | |
… | |
316 | } |
302 | } |
317 | else |
303 | else |
318 | #endif /* TTY_GID_SUPPORT */ |
304 | #endif /* TTY_GID_SUPPORT */ |
319 | { |
305 | { |
320 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
306 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
321 | gid = getgid (); |
307 | gid = 0; |
322 | } |
308 | } |
323 | } |
309 | } |
324 | } ttyconf; |
310 | } ttyconf; |
325 | |
311 | |
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312 | ptytty_unix::ptytty_unix () |
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313 | { |
|
|
314 | name = 0; |
|
|
315 | #if UTMP_SUPPORT |
|
|
316 | cmd_pid = 0; |
|
|
317 | #endif |
|
|
318 | } |
|
|
319 | |
|
|
320 | ptytty_unix::~ptytty_unix () |
|
|
321 | { |
|
|
322 | #if UTMP_SUPPORT |
|
|
323 | logout (); |
|
|
324 | #endif |
|
|
325 | put (); |
|
|
326 | } |
|
|
327 | |
326 | void |
328 | void |
327 | rxvt_ptytty::privileges (rxvt_privaction action) |
329 | ptytty_unix::put () |
328 | { |
330 | { |
329 | if (!name || !*name) |
331 | chmod (name, RESTORE_TTY_MODE); |
330 | return; |
332 | chown (name, 0, ttyconf.gid); |
331 | |
333 | |
332 | rxvt_privileges (RESTORE); |
334 | close_tty (); |
333 | |
335 | |
334 | if (action == SAVE) |
336 | if (pty >= 0) |
335 | { |
337 | close (pty); |
336 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
337 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
|
|
338 | if (lstat (name, &savestat) < 0) /* you lose out */ |
|
|
339 | ; |
|
|
340 | else |
|
|
341 | # endif |
|
|
342 | { |
|
|
343 | saved = true; |
|
|
344 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
345 | chmod (name, ttyconf.mode); |
|
|
346 | # ifdef HAVE_REVOKE |
|
|
347 | revoke (name); |
|
|
348 | # endif |
|
|
349 | } |
|
|
350 | } |
|
|
351 | else |
|
|
352 | { /* action == RESTORE */ |
|
|
353 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
354 | if (saved) |
|
|
355 | { |
|
|
356 | chmod (name, savestat.st_mode); |
|
|
357 | chown (name, savestat.st_uid, savestat.st_gid); |
|
|
358 | } |
|
|
359 | # else |
|
|
360 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
|
|
361 | chown (name, 0, 0); |
|
|
362 | # endif |
|
|
363 | |
338 | |
364 | } |
339 | free (name); |
365 | |
340 | |
366 | rxvt_privileges (IGNORE); |
|
|
367 | } |
|
|
368 | #endif |
|
|
369 | |
|
|
370 | rxvt_ptytty::rxvt_ptytty () |
|
|
371 | { |
|
|
372 | pty = tty = -1; |
341 | pty = tty = -1; |
373 | name = 0; |
342 | name = 0; |
374 | #ifndef NO_SETOWNER_TTYDEV |
|
|
375 | saved = false; |
|
|
376 | #endif |
|
|
377 | } |
|
|
378 | |
|
|
379 | rxvt_ptytty::~rxvt_ptytty () |
|
|
380 | { |
|
|
381 | put (); |
|
|
382 | } |
|
|
383 | |
|
|
384 | void |
|
|
385 | |
|
|
386 | rxvt_ptytty::close_tty () |
|
|
387 | { |
|
|
388 | if (tty < 0) |
|
|
389 | return; |
|
|
390 | |
|
|
391 | close (tty); |
|
|
392 | tty = -1; |
|
|
393 | } |
|
|
394 | |
|
|
395 | void |
|
|
396 | rxvt_ptytty::put () |
|
|
397 | { |
|
|
398 | #ifndef NO_SETOWNER_TTYDEV |
|
|
399 | privileges (RESTORE); |
|
|
400 | #endif |
|
|
401 | |
|
|
402 | if (pty >= 0) close (pty); |
|
|
403 | close_tty (); |
|
|
404 | free (name); |
|
|
405 | |
|
|
406 | pty = tty = -1; |
|
|
407 | name = 0; |
|
|
408 | } |
343 | } |
409 | |
344 | |
410 | bool |
345 | bool |
411 | rxvt_ptytty::make_controlling_tty () |
346 | ptytty_unix::get () |
412 | { |
|
|
413 | return control_tty (tty, name) >= 0; |
|
|
414 | } |
|
|
415 | |
|
|
416 | bool |
|
|
417 | rxvt_ptytty::get () |
|
|
418 | { |
347 | { |
419 | /* get master (pty) */ |
348 | /* get master (pty) */ |
420 | if ((pty = get_pty (&tty, &name)) < 0) |
349 | if ((pty = get_pty (&tty, &name)) < 0) |
421 | return false; |
350 | return false; |
422 | |
351 | |
… | |
… | |
424 | |
353 | |
425 | /* get slave (tty) */ |
354 | /* get slave (tty) */ |
426 | if (tty < 0) |
355 | if (tty < 0) |
427 | { |
356 | { |
428 | #ifndef NO_SETOWNER_TTYDEV |
357 | #ifndef NO_SETOWNER_TTYDEV |
429 | privileges (SAVE); |
358 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
359 | chmod (name, ttyconf.mode); |
|
|
360 | # ifdef HAVE_REVOKE |
|
|
361 | revoke (name); |
|
|
362 | # endif |
430 | #endif |
363 | #endif |
431 | |
364 | |
432 | if ((tty = get_tty (name)) < 0) |
365 | if ((tty = get_tty (name)) < 0) |
433 | { |
366 | { |
434 | put (); |
367 | put (); |
… | |
… | |
437 | } |
370 | } |
438 | |
371 | |
439 | return true; |
372 | return true; |
440 | } |
373 | } |
441 | |
374 | |
|
|
375 | #if PTYTTY_HELPER |
|
|
376 | |
|
|
377 | static int sock_fd = -1; |
|
|
378 | static int helper_pid, owner_pid; |
|
|
379 | |
|
|
380 | struct command |
|
|
381 | { |
|
|
382 | enum { get, login, destroy } type; |
|
|
383 | |
|
|
384 | ptytty *id; |
|
|
385 | |
|
|
386 | bool login_shell; |
|
|
387 | int cmd_pid; |
|
|
388 | char hostname[512]; // arbitrary, but should be plenty |
|
|
389 | }; |
|
|
390 | |
|
|
391 | struct ptytty_proxy : ptytty |
|
|
392 | { |
|
|
393 | ptytty *id; |
|
|
394 | |
|
|
395 | ptytty_proxy () |
|
|
396 | : id(0) |
|
|
397 | { |
|
|
398 | } |
|
|
399 | |
|
|
400 | ~ptytty_proxy (); |
|
|
401 | |
|
|
402 | bool get (); |
|
|
403 | void login (int cmd_pid, bool login_shell, const char *hostname); |
|
|
404 | }; |
|
|
405 | |
|
|
406 | bool |
|
|
407 | ptytty_proxy::get () |
|
|
408 | { |
|
|
409 | command cmd; |
|
|
410 | |
|
|
411 | cmd.type = command::get; |
|
|
412 | |
|
|
413 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
414 | |
|
|
415 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
|
|
416 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
|
|
417 | |
|
|
418 | if (!id) |
|
|
419 | return false; |
|
|
420 | |
|
|
421 | if ((pty = recv_fd (sock_fd)) < 0 |
|
|
422 | || (tty = recv_fd (sock_fd)) < 0) |
|
|
423 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
|
|
424 | |
|
|
425 | return true; |
|
|
426 | } |
|
|
427 | |
442 | void |
428 | void |
443 | rxvt_ptytty::set_utf8_mode (bool on) |
429 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
444 | { |
430 | { |
445 | #ifdef IUTF8 |
431 | command cmd; |
446 | if (pty < 0) |
432 | |
|
|
433 | cmd.type = command::login; |
|
|
434 | cmd.id = id; |
|
|
435 | cmd.cmd_pid = cmd_pid; |
|
|
436 | cmd.login_shell = login_shell; |
|
|
437 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
|
|
438 | |
|
|
439 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
440 | } |
|
|
441 | |
|
|
442 | ptytty_proxy::~ptytty_proxy () |
|
|
443 | { |
|
|
444 | if (id) |
|
|
445 | { |
|
|
446 | command cmd; |
|
|
447 | |
|
|
448 | cmd.type = command::destroy; |
|
|
449 | cmd.id = id; |
|
|
450 | |
|
|
451 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
452 | } |
|
|
453 | } |
|
|
454 | |
|
|
455 | static |
|
|
456 | void serve () |
|
|
457 | { |
|
|
458 | command cmd; |
|
|
459 | vector<ptytty *> ptys; |
|
|
460 | |
|
|
461 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
|
|
462 | { |
|
|
463 | if (cmd.type == command::get) |
|
|
464 | { |
|
|
465 | // -> id ptyfd ttyfd |
|
|
466 | cmd.id = new ptytty_unix; |
|
|
467 | |
|
|
468 | if (cmd.id->get ()) |
|
|
469 | { |
|
|
470 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
471 | ptys.push_back (cmd.id); |
|
|
472 | |
|
|
473 | ptytty::send_fd (sock_fd, cmd.id->pty); |
|
|
474 | ptytty::send_fd (sock_fd, cmd.id->tty); |
|
|
475 | } |
|
|
476 | else |
|
|
477 | { |
|
|
478 | delete cmd.id; |
|
|
479 | cmd.id = 0; |
|
|
480 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
481 | } |
|
|
482 | } |
|
|
483 | else if (cmd.type == command::login) |
|
|
484 | { |
|
|
485 | #if UTMP_SUPPORT |
|
|
486 | if (find (ptys.begin (), ptys.end (), cmd.id)) |
|
|
487 | { |
|
|
488 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
|
|
489 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
|
|
490 | } |
|
|
491 | #endif |
|
|
492 | } |
|
|
493 | else if (cmd.type == command::destroy) |
|
|
494 | { |
|
|
495 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
|
|
496 | |
|
|
497 | if (pty != ptys.end ()) |
|
|
498 | { |
|
|
499 | delete *pty; |
|
|
500 | ptys.erase (pty); |
|
|
501 | } |
|
|
502 | } |
|
|
503 | else |
|
|
504 | break; |
|
|
505 | } |
|
|
506 | |
|
|
507 | // destroy all ptys |
|
|
508 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
|
|
509 | delete *i; |
|
|
510 | } |
|
|
511 | |
|
|
512 | void |
|
|
513 | ptytty::use_helper () |
|
|
514 | { |
|
|
515 | int pid = getpid (); |
|
|
516 | |
|
|
517 | if (sock_fd >= 0 && pid == owner_pid) |
447 | return; |
518 | return; |
448 | |
519 | |
449 | struct termios tio; |
520 | owner_pid = pid; |
450 | |
521 | |
451 | if (tcgetattr (pty, &tio) != -1) |
522 | int sv[2]; |
452 | { |
|
|
453 | tcflag_t new_cflag = tio.c_iflag; |
|
|
454 | |
523 | |
455 | if (on) |
524 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
456 | new_cflag |= IUTF8; |
525 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
457 | else |
|
|
458 | new_cflag &= ~IUTF8; |
|
|
459 | |
526 | |
460 | if (new_cflag != tio.c_iflag) |
527 | helper_pid = fork (); |
461 | { |
528 | |
462 | tio.c_iflag = new_cflag; |
529 | if (helper_pid < 0) |
463 | tcsetattr (pty, TCSANOW, &tio); |
530 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
464 | } |
531 | |
|
|
532 | if (helper_pid) |
465 | } |
533 | { |
466 | #endif |
534 | // client, process |
467 | } |
535 | sock_fd = sv[0]; |
|
|
536 | close (sv[1]); |
|
|
537 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
538 | } |
|
|
539 | else |
|
|
540 | { |
|
|
541 | // server, pty-helper |
|
|
542 | sock_fd = sv[1]; |
468 | |
543 | |
469 | /*----------------------- end-of-file (C source) -----------------------*/ |
544 | chdir ("/"); |
470 | |
545 | |
|
|
546 | for (int fd = 0; fd < 1023; fd++) |
|
|
547 | if (fd != sock_fd) |
|
|
548 | close (fd); |
|
|
549 | |
|
|
550 | serve (); |
|
|
551 | _exit (EXIT_SUCCESS); |
|
|
552 | } |
|
|
553 | } |
|
|
554 | |
|
|
555 | #endif |
|
|
556 | |
|
|
557 | ptytty * |
|
|
558 | ptytty::create () |
|
|
559 | { |
|
|
560 | #if PTYTTY_HELPER |
|
|
561 | if (helper_pid && getpid () == owner_pid) |
|
|
562 | // use helper process |
|
|
563 | return new ptytty_proxy; |
|
|
564 | else |
|
|
565 | #endif |
|
|
566 | return new ptytty_unix; |
|
|
567 | } |
|
|
568 | |
|
|
569 | void |
|
|
570 | ptytty::init () |
|
|
571 | { |
|
|
572 | uid_t uid = getuid (); |
|
|
573 | gid_t gid = getgid (); |
|
|
574 | |
|
|
575 | // before doing anything else, check for setuid/setgid operation, |
|
|
576 | // start the helper process and drop privileges |
|
|
577 | if (uid != geteuid () |
|
|
578 | || gid != getegid ()) |
|
|
579 | { |
|
|
580 | #if PTYTTY_HELPER |
|
|
581 | use_helper (); |
|
|
582 | #else |
|
|
583 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
|
|
584 | #endif |
|
|
585 | |
|
|
586 | drop_privileges (); |
|
|
587 | } |
|
|
588 | } |
|
|
589 | |
|
|
590 | void |
|
|
591 | ptytty::drop_privileges () |
|
|
592 | { |
|
|
593 | uid_t uid = getuid (); |
|
|
594 | gid_t gid = getgid (); |
|
|
595 | |
|
|
596 | // drop privileges |
|
|
597 | #if HAVE_SETRESUID |
|
|
598 | setresgid (gid, gid, gid); |
|
|
599 | setresuid (uid, uid, uid); |
|
|
600 | #elif HAVE_SETREUID |
|
|
601 | setregid (gid, gid); |
|
|
602 | setreuid (uid, uid); |
|
|
603 | #elif HAVE_SETUID |
|
|
604 | setgid (gid); |
|
|
605 | setuid (uid); |
|
|
606 | #endif |
|
|
607 | |
|
|
608 | if (uid != geteuid () |
|
|
609 | || gid != getegid ()) |
|
|
610 | ptytty_fatal ("unable to drop privileges, aborting.\n"); |
|
|
611 | } |
|
|
612 | |