1 | /*--------------------------------*-C-*---------------------------------* |
1 | /*--------------------------------*-C-*---------------------------------* |
2 | * File: ptytty.c |
2 | * File: ptytty.C |
3 | *----------------------------------------------------------------------* |
3 | *----------------------------------------------------------------------* |
4 | * |
4 | * |
5 | * All portions of code are copyright by their respective author/s. |
5 | * All portions of code are copyright by their respective author/s. |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
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7 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
7 | * |
8 | * |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by |
10 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 2 of the License, or |
11 | * the Free Software Foundation; either version 2 of the License, or |
11 | * (at your option) any later version. |
12 | * (at your option) any later version. |
… | |
… | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
21 | *---------------------------------------------------------------------*/ |
22 | *---------------------------------------------------------------------*/ |
22 | |
23 | |
23 | #include "../config.h" /* NECESSARY */ |
24 | #include "../config.h" /* NECESSARY */ |
24 | |
25 | |
25 | /* |
26 | #include "fdpass.h" |
26 | * Try to be self-contained except for the above autoconfig'd defines |
27 | #include "ptytty.h" |
27 | */ |
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28 | |
28 | |
29 | #include <stdio.h> |
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30 | #ifdef HAVE_STDLIB_H |
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31 | # include <stdlib.h> |
29 | #include <cstdlib> |
32 | #endif |
30 | #include <cstring> |
33 | #ifdef HAVE_SYS_TYPES_H |
31 | |
34 | # include <sys/types.h> |
32 | #include <sys/types.h> |
35 | #endif |
33 | #include <sys/socket.h> |
36 | #ifdef HAVE_UNISTD_H |
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37 | # include <unistd.h> |
34 | #include <unistd.h> |
38 | #endif |
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39 | #if defined(HAVE_STRING_H) |
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40 | # include <string.h> |
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41 | #endif |
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42 | #ifdef HAVE_FCNTL_H |
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43 | # include <fcntl.h> |
35 | #include <fcntl.h> |
44 | #endif |
36 | |
45 | #ifdef HAVE_SYS_IOCTL_H |
37 | #ifdef HAVE_SYS_IOCTL_H |
46 | # include <sys/ioctl.h> |
38 | # include <sys/ioctl.h> |
47 | #endif |
39 | #endif |
48 | #if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) |
40 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
49 | # include <sys/stropts.h> /* for I_PUSH */ |
41 | # include <sys/stropts.h> /* for I_PUSH */ |
50 | #endif |
42 | #endif |
51 | |
43 | #ifdef HAVE_ISASTREAM |
52 | #ifdef DEBUG_TTY |
44 | # include <stropts.h> |
53 | # define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) |
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54 | #else |
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55 | # define D_TTY(x) |
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56 | #endif |
45 | #endif |
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46 | #if defined(HAVE_PTY_H) |
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47 | # include <pty.h> |
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48 | #elif defined(HAVE_LIBUTIL_H) |
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49 | # include <libutil.h> |
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50 | #elif defined(HAVE_UTIL_H) |
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51 | # include <util.h> |
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52 | #endif |
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53 | #ifdef TTY_GID_SUPPORT |
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54 | #include <grp.h> |
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55 | #endif |
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56 | |
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57 | #include <cstdio> |
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58 | |
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59 | ///////////////////////////////////////////////////////////////////////////// |
57 | |
60 | |
58 | /* ------------------------------------------------------------------------- * |
61 | /* ------------------------------------------------------------------------- * |
59 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
60 | * ------------------------------------------------------------------------- */ |
63 | * ------------------------------------------------------------------------- */ |
61 | /* |
64 | /* |
62 | * Returns pty file descriptor, or -1 on failure |
65 | * Returns pty file descriptor, or -1 on failure |
63 | * If successful, ttydev is set to the name of the slave device. |
66 | * If successful, ttydev is set to the name of the slave device. |
64 | * fd_tty _may_ also be set to an open fd to the slave device |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
65 | */ |
68 | */ |
66 | /* EXTPROTO */ |
69 | #if defined(UNIX98_PTY) |
67 | int |
70 | static int |
68 | rxvt_get_pty (int *fd_tty, const char **ttydev) |
71 | get_pty (int *fd_tty, char **ttydev) |
69 | { |
72 | { |
70 | int pfd; |
73 | int pfd; |
71 | |
74 | |
72 | #ifdef PTYS_ARE_OPENPTY |
75 | # if defined(HAVE_GETPT) |
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76 | pfd = getpt(); |
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77 | # elif defined(HAVE_POSIX_OPENPT) |
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78 | pfd = posix_openpt (O_RDWR); |
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79 | # else |
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80 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
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81 | # endif |
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82 | if (pfd >= 0) |
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83 | { |
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84 | if (grantpt (pfd) == 0 /* change slave permissions */ |
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85 | && unlockpt (pfd) == 0) |
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86 | { /* slave now unlocked */ |
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87 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
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88 | return pfd; |
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89 | } |
73 | |
90 | |
74 | char tty_name[sizeof "/dev/pts/????\0"]; |
91 | close (pfd); |
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92 | } |
75 | |
93 | |
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94 | return -1; |
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95 | } |
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96 | #elif defined(HAVE_OPENPTY) |
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97 | static int |
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98 | get_pty (int *fd_tty, char **ttydev) |
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99 | { |
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100 | int pfd; |
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101 | int res; |
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102 | char tty_name[32]; |
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103 | |
76 | if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) |
104 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
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105 | if (res != -1) |
77 | { |
106 | { |
78 | *ttydev = strdup (tty_name); |
107 | *ttydev = strdup (tty_name); |
79 | return pfd; |
108 | return pfd; |
80 | } |
109 | } |
81 | #endif |
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82 | |
110 | |
83 | #ifdef PTYS_ARE__GETPTY |
111 | return -1; |
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112 | } |
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113 | #elif defined(HAVE__GETPTY) |
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114 | static int |
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115 | get_pty (int *fd_tty, char **ttydev) |
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116 | { |
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117 | int pfd; |
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118 | |
84 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
119 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
85 | if (*ttydev != NULL) |
120 | if (*ttydev != NULL) |
86 | return pfd; |
121 | return pfd; |
87 | #endif |
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88 | |
122 | |
89 | #ifdef PTYS_ARE_GETPTY |
123 | return -1; |
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124 | } |
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125 | #elif defined(HAVE_DEV_PTC) |
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126 | static int |
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127 | get_pty (int *fd_tty, char **ttydev) |
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128 | { |
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129 | int pfd; |
90 | |
130 | |
91 | char *ptydev; |
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92 | |
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93 | while ((ptydev = getpty ()) != NULL) |
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94 | if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0) |
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95 | { |
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96 | *ttydev = ptydev; |
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97 | return pfd; |
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98 | } |
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99 | #endif |
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100 | |
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101 | #if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
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102 | # if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) |
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103 | |
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104 | { |
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105 | # ifdef PTYS_ARE_GETPT |
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106 | pfd = getpt (); |
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107 | # else |
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108 | |
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109 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
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110 | # endif |
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111 | |
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112 | if (pfd >= 0) |
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113 | { |
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114 | if (grantpt (pfd) == 0 /* change slave permissions */ |
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115 | && unlockpt (pfd) == 0) |
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116 | { /* slave now unlocked */ |
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117 | *ttydev = ptsname (pfd); /* get slave's name */ |
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118 | return pfd; |
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119 | } |
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120 | close (pfd); |
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121 | } |
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122 | } |
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123 | # endif |
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124 | #endif |
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125 | |
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126 | #ifdef PTYS_ARE_PTC |
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127 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
131 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
128 | { |
132 | { |
129 | *ttydev = ttyname (pfd); |
133 | *ttydev = strdup (ttyname (pfd)); |
130 | return pfd; |
134 | return pfd; |
131 | } |
135 | } |
132 | #endif |
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133 | |
136 | |
134 | #ifdef PTYS_ARE_CLONE |
137 | return -1; |
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138 | } |
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139 | #elif defined(HAVE_DEV_CLONE) |
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140 | static int |
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141 | get_pty (int *fd_tty, char **ttydev) |
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142 | { |
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143 | int pfd; |
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144 | |
135 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
145 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
136 | { |
146 | { |
137 | *ttydev = ptsname (pfd); |
147 | *ttydev = strdup (ptsname (pfd)); |
138 | return pfd; |
148 | return pfd; |
139 | } |
149 | } |
140 | #endif |
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141 | |
150 | |
142 | #ifdef PTYS_ARE_NUMERIC |
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143 | { |
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144 | int idx; |
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145 | char *c1, *c2; |
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146 | char pty_name[] = "/dev/ptyp???"; |
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147 | char tty_name[] = "/dev/ttyp???"; |
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148 | |
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149 | c1 = & (pty_name[sizeof (pty_name) - 4]); |
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150 | c2 = & (tty_name[sizeof (tty_name) - 4]); |
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151 | for (idx = 0; idx < 256; idx++) |
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152 | { |
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153 | sprintf (c1, "%d", idx); |
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154 | sprintf (c2, "%d", idx); |
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155 | if (access (tty_name, F_OK) < 0) |
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156 | { |
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157 | idx = 256; |
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158 | break; |
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159 | } |
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160 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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161 | { |
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162 | if (access (tty_name, R_OK | W_OK) == 0) |
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163 | { |
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164 | *ttydev = strdup (tty_name); |
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165 | return pfd; |
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166 | } |
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167 | close (pfd); |
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168 | } |
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169 | } |
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170 | } |
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171 | #endif |
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172 | #ifdef PTYS_ARE_SEARCHED |
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173 | { |
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174 | const char *c1, *c2; |
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175 | char pty_name[] = "/dev/pty??"; |
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176 | char tty_name[] = "/dev/tty??"; |
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177 | |
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178 | # ifndef PTYCHAR1 |
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179 | # define PTYCHAR1 "pqrstuvwxyz" |
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180 | # endif |
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181 | # ifndef PTYCHAR2 |
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182 | # define PTYCHAR2 "0123456789abcdef" |
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183 | # endif |
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184 | |
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185 | for (c1 = PTYCHAR1; *c1; c1++) |
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186 | { |
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187 | pty_name[ (sizeof (pty_name) - 3)] = |
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188 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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189 | for (c2 = PTYCHAR2; *c2; c2++) |
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190 | { |
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191 | pty_name[ (sizeof (pty_name) - 2)] = |
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192 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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193 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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194 | { |
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195 | if (access (tty_name, R_OK | W_OK) == 0) |
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196 | { |
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197 | *ttydev = strdup (tty_name); |
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198 | return pfd; |
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199 | } |
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200 | close (pfd); |
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201 | } |
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202 | } |
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203 | } |
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204 | } |
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205 | #endif |
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206 | return -1; |
151 | return -1; |
207 | } |
152 | } |
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153 | #else |
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154 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
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155 | static int |
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156 | get_pty (int *fd_tty, char **ttydev) |
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157 | { |
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158 | int pfd; |
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159 | int i; |
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160 | char pty_name[32]; |
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161 | char tty_name[32]; |
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162 | const char *majors = "pqrstuvwxyzabcde"; |
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163 | const char *minors = "0123456789abcdef"; |
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164 | for (i = 0; i < 256; i++) |
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165 | { |
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166 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
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167 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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168 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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169 | { |
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170 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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171 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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172 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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173 | continue; |
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174 | } |
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175 | if (access (tty_name, R_OK | W_OK) == 0) |
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176 | { |
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177 | *ttydev = strdup (tty_name); |
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178 | return pfd; |
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179 | } |
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180 | |
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181 | close (pfd); |
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182 | } |
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183 | } |
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184 | #endif |
208 | |
185 | |
209 | /*----------------------------------------------------------------------*/ |
186 | /*----------------------------------------------------------------------*/ |
210 | /* |
187 | /* |
211 | * Returns tty file descriptor, or -1 on failure |
188 | * Returns tty file descriptor, or -1 on failure |
212 | */ |
189 | */ |
213 | /* EXTPROTO */ |
190 | static int |
214 | int |
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215 | rxvt_get_tty (const char *ttydev) |
191 | get_tty (char *ttydev) |
216 | { |
192 | { |
217 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
193 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
218 | } |
194 | } |
219 | |
195 | |
220 | /*----------------------------------------------------------------------*/ |
196 | /*----------------------------------------------------------------------*/ |
221 | /* |
197 | /* |
222 | * Make our tty a controlling tty so that /dev/tty points to us |
198 | * Make our tty a controlling tty so that /dev/tty points to us |
223 | */ |
199 | */ |
224 | /* EXTPROTO */ |
200 | static int |
225 | int |
201 | control_tty (int fd_tty) |
226 | rxvt_control_tty (int fd_tty, const char *ttydev) |
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227 | { |
202 | { |
228 | #ifndef __QNX__ |
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229 | int fd; |
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230 | |
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231 | D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev)); |
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232 | /* ---------------------------------------- */ |
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233 | # ifdef HAVE_SETSID |
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234 | setsid (); |
203 | setsid (); |
235 | # endif |
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236 | # if defined(HAVE_SETPGID) |
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237 | setpgid (0, 0); |
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238 | # elif defined(HAVE_SETPGRP) |
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239 | setpgrp (0, 0); |
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240 | # endif |
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241 | /* ---------------------------------------- */ |
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242 | # ifdef TIOCNOTTY |
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243 | |
204 | |
244 | fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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245 | D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes")); |
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246 | if (fd >= 0) |
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247 | { |
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248 | ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */ |
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249 | close (fd); |
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250 | } |
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251 | # endif |
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252 | /* ---------------------------------------- */ |
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253 | fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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254 | D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)")); |
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255 | if (fd >= 0) |
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256 | close (fd); /* ouch: still have controlling tty */ |
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257 | /* ---------------------------------------- */ |
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258 | #if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
205 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
259 | /* |
206 | /* |
260 | * Push STREAMS modules: |
207 | * Push STREAMS modules: |
261 | * ptem: pseudo-terminal hardware emulation module. |
208 | * ptem: pseudo-terminal hardware emulation module. |
262 | * ldterm: standard terminal line discipline. |
209 | * ldterm: standard terminal line discipline. |
263 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
210 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
… | |
275 | */ |
222 | */ |
276 | # ifdef HAVE_ISASTREAM |
223 | # ifdef HAVE_ISASTREAM |
277 | if (isastream (fd_tty) == 1) |
224 | if (isastream (fd_tty) == 1) |
278 | # endif |
225 | # endif |
279 | { |
226 | { |
280 | D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules")); |
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281 | ioctl (fd_tty, I_PUSH, "ptem"); |
227 | ioctl (fd_tty, I_PUSH, "ptem"); |
282 | ioctl (fd_tty, I_PUSH, "ldterm"); |
228 | ioctl (fd_tty, I_PUSH, "ldterm"); |
283 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
229 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
284 | } |
230 | } |
285 | #endif |
231 | #endif |
286 | /* ---------------------------------------- */ |
232 | |
287 | # if defined(TIOCSCTTY) |
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288 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
233 | ioctl (fd_tty, TIOCSCTTY, NULL); |
289 | D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd)); |
234 | |
290 | # elif defined(TIOCSETCTTY) |
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291 | fd = ioctl (fd_tty, TIOCSETCTTY, NULL); |
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292 | D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd)); |
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293 | # else |
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294 | fd = open (ttydev, O_RDWR); |
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295 | D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK")); |
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296 | if (fd >= 0) |
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297 | close (fd); |
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298 | # endif |
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299 | /* ---------------------------------------- */ |
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300 | fd = open ("/dev/tty", O_WRONLY); |
235 | int fd = open ("/dev/tty", O_WRONLY); |
301 | D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); |
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302 | if (fd < 0) |
236 | if (fd < 0) |
303 | return -1; /* fatal */ |
237 | return -1; /* fatal */ |
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238 | |
304 | close (fd); |
239 | close (fd); |
305 | /* ---------------------------------------- */ |
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306 | D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ())); |
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307 | /* ---------------------------------------- */ |
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308 | #endif /* ! __QNX__ */ |
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309 | |
240 | |
310 | return 0; |
241 | return 0; |
311 | } |
242 | } |
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243 | |
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244 | void |
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245 | ptytty::close_tty () |
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246 | { |
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247 | if (tty < 0) |
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248 | return; |
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249 | |
|
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250 | close (tty); |
|
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251 | tty = -1; |
|
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252 | } |
|
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253 | |
|
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254 | bool |
|
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255 | ptytty::make_controlling_tty () |
|
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256 | { |
|
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257 | return control_tty (tty) >= 0; |
|
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258 | } |
|
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259 | |
|
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260 | void |
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261 | ptytty::set_utf8_mode (bool on) |
|
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262 | { |
|
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263 | #ifdef IUTF8 |
|
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264 | if (pty < 0) |
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265 | return; |
|
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266 | |
|
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267 | struct termios tio; |
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268 | |
|
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269 | if (tcgetattr (pty, &tio) != -1) |
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270 | { |
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271 | tcflag_t new_cflag = tio.c_iflag; |
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272 | |
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273 | if (on) |
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274 | new_cflag |= IUTF8; |
|
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275 | else |
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276 | new_cflag &= ~IUTF8; |
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277 | |
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278 | if (new_cflag != tio.c_iflag) |
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279 | { |
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280 | tio.c_iflag = new_cflag; |
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281 | tcsetattr (pty, TCSANOW, &tio); |
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282 | } |
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283 | } |
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284 | #endif |
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285 | } |
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286 | |
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287 | static struct ttyconf { |
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288 | gid_t gid; |
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289 | mode_t mode; |
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290 | |
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291 | ttyconf () |
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292 | { |
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293 | #ifdef TTY_GID_SUPPORT |
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294 | struct group *gr = getgrnam ("tty"); |
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295 | |
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296 | if (gr) |
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297 | { /* change group ownership of tty to "tty" */ |
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298 | mode = S_IRUSR | S_IWUSR | S_IWGRP; |
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299 | gid = gr->gr_gid; |
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300 | } |
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301 | else |
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302 | #endif /* TTY_GID_SUPPORT */ |
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303 | { |
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304 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
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305 | gid = 0; |
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306 | } |
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307 | } |
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308 | } ttyconf; |
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309 | |
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310 | ptytty_unix::ptytty_unix () |
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311 | { |
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312 | name = 0; |
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313 | #if UTMP_SUPPORT |
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314 | cmd_pid = 0; |
|
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315 | #endif |
|
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316 | } |
|
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317 | |
|
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318 | ptytty_unix::~ptytty_unix () |
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319 | { |
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320 | #if UTMP_SUPPORT |
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321 | logout (); |
|
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322 | #endif |
|
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323 | put (); |
|
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324 | } |
|
|
325 | |
|
|
326 | void |
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327 | ptytty_unix::put () |
|
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328 | { |
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329 | chmod (name, RESTORE_TTY_MODE); |
|
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330 | chown (name, 0, ttyconf.gid); |
|
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331 | |
|
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332 | close_tty (); |
|
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333 | |
|
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334 | if (pty >= 0) |
|
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335 | close (pty); |
|
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336 | |
|
|
337 | free (name); |
|
|
338 | |
|
|
339 | pty = tty = -1; |
|
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340 | name = 0; |
|
|
341 | } |
|
|
342 | |
|
|
343 | bool |
|
|
344 | ptytty_unix::get () |
|
|
345 | { |
|
|
346 | /* get master (pty) */ |
|
|
347 | if ((pty = get_pty (&tty, &name)) < 0) |
|
|
348 | return false; |
|
|
349 | |
|
|
350 | fcntl (pty, F_SETFL, O_NONBLOCK); |
|
|
351 | |
|
|
352 | /* get slave (tty) */ |
|
|
353 | if (tty < 0) |
|
|
354 | { |
|
|
355 | #ifndef NO_SETOWNER_TTYDEV |
|
|
356 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
357 | chmod (name, ttyconf.mode); |
|
|
358 | # ifdef HAVE_REVOKE |
|
|
359 | revoke (name); |
|
|
360 | # endif |
|
|
361 | #endif |
|
|
362 | |
|
|
363 | if ((tty = get_tty (name)) < 0) |
|
|
364 | { |
|
|
365 | put (); |
|
|
366 | return false; |
|
|
367 | } |
|
|
368 | } |
|
|
369 | |
|
|
370 | return true; |
|
|
371 | } |
|
|
372 | |
|
|
373 | #if PTYTTY_HELPER |
|
|
374 | |
|
|
375 | static int sock_fd; |
|
|
376 | static int pid; |
|
|
377 | |
|
|
378 | struct command |
|
|
379 | { |
|
|
380 | enum { get, login, destroy } type; |
|
|
381 | |
|
|
382 | ptytty *id; |
|
|
383 | |
|
|
384 | bool login_shell; |
|
|
385 | int cmd_pid; |
|
|
386 | char hostname[512]; // arbitrary, but should be plenty |
|
|
387 | }; |
|
|
388 | |
|
|
389 | struct ptytty_proxy : ptytty |
|
|
390 | { |
|
|
391 | ptytty *id; |
|
|
392 | |
|
|
393 | ptytty_proxy () |
|
|
394 | : id(0) |
|
|
395 | { |
|
|
396 | } |
|
|
397 | |
|
|
398 | ~ptytty_proxy (); |
|
|
399 | |
|
|
400 | bool get (); |
|
|
401 | void login (int cmd_pid, bool login_shell, const char *hostname); |
|
|
402 | }; |
|
|
403 | |
|
|
404 | bool |
|
|
405 | ptytty_proxy::get () |
|
|
406 | { |
|
|
407 | command cmd; |
|
|
408 | |
|
|
409 | cmd.type = command::get; |
|
|
410 | |
|
|
411 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
412 | |
|
|
413 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
|
|
414 | fatal ("protocol error while creating pty using helper process, aborting.\n"); |
|
|
415 | |
|
|
416 | if (!id) |
|
|
417 | return false; |
|
|
418 | |
|
|
419 | if ((pty = ptytty_recv_fd (sock_fd)) < 0 |
|
|
420 | || (tty = ptytty_recv_fd (sock_fd)) < 0) |
|
|
421 | fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
|
|
422 | |
|
|
423 | return true; |
|
|
424 | } |
|
|
425 | |
|
|
426 | void |
|
|
427 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
|
|
428 | { |
|
|
429 | command cmd; |
|
|
430 | |
|
|
431 | cmd.type = command::login; |
|
|
432 | cmd.id = id; |
|
|
433 | cmd.cmd_pid = cmd_pid; |
|
|
434 | cmd.login_shell = login_shell; |
|
|
435 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
|
|
436 | |
|
|
437 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
438 | } |
|
|
439 | |
|
|
440 | ptytty_proxy::~ptytty_proxy () |
|
|
441 | { |
|
|
442 | if (id) |
|
|
443 | { |
|
|
444 | command cmd; |
|
|
445 | |
|
|
446 | cmd.type = command::destroy; |
|
|
447 | cmd.id = id; |
|
|
448 | |
|
|
449 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
450 | } |
|
|
451 | } |
|
|
452 | |
|
|
453 | static |
|
|
454 | void serve () |
|
|
455 | { |
|
|
456 | command cmd; |
|
|
457 | vector<ptytty *> ptys; |
|
|
458 | |
|
|
459 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
|
|
460 | { |
|
|
461 | if (cmd.type == command::get) |
|
|
462 | { |
|
|
463 | // -> id ptyfd ttyfd |
|
|
464 | cmd.id = new ptytty_unix; |
|
|
465 | |
|
|
466 | if (cmd.id->get ()) |
|
|
467 | { |
|
|
468 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
469 | ptys.push_back (cmd.id); |
|
|
470 | |
|
|
471 | ptytty_send_fd (sock_fd, cmd.id->pty); |
|
|
472 | ptytty_send_fd (sock_fd, cmd.id->tty); |
|
|
473 | } |
|
|
474 | else |
|
|
475 | { |
|
|
476 | delete cmd.id; |
|
|
477 | cmd.id = 0; |
|
|
478 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
479 | } |
|
|
480 | } |
|
|
481 | else if (cmd.type == command::login) |
|
|
482 | { |
|
|
483 | #if UTMP_SUPPORT |
|
|
484 | if (find (ptys.begin (), ptys.end (), cmd.id)) |
|
|
485 | { |
|
|
486 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
|
|
487 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
|
|
488 | } |
|
|
489 | #endif |
|
|
490 | } |
|
|
491 | else if (cmd.type == command::destroy) |
|
|
492 | { |
|
|
493 | ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
|
|
494 | |
|
|
495 | if (pty) |
|
|
496 | { |
|
|
497 | delete *pty; |
|
|
498 | ptys.erase (pty); |
|
|
499 | } |
|
|
500 | } |
|
|
501 | else |
|
|
502 | break; |
|
|
503 | } |
|
|
504 | |
|
|
505 | // destroy all ptys |
|
|
506 | for (ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
|
|
507 | delete *i; |
|
|
508 | } |
|
|
509 | |
|
|
510 | void ptytty_server () |
|
|
511 | { |
|
|
512 | int sv[2]; |
|
|
513 | |
|
|
514 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
|
|
515 | fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
516 | |
|
|
517 | pid = fork (); |
|
|
518 | |
|
|
519 | if (pid < 0) |
|
|
520 | fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
|
|
521 | |
|
|
522 | if (pid) |
|
|
523 | { |
|
|
524 | // client, process |
|
|
525 | sock_fd = sv[0]; |
|
|
526 | close (sv[1]); |
|
|
527 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
528 | } |
|
|
529 | else |
|
|
530 | { |
|
|
531 | // server, pty-helper |
|
|
532 | sock_fd = sv[1]; |
|
|
533 | |
|
|
534 | for (int fd = 0; fd < 1023; fd++) |
|
|
535 | if (fd != sock_fd) |
|
|
536 | close (fd); |
|
|
537 | |
|
|
538 | serve (); |
|
|
539 | _exit (EXIT_SUCCESS); |
|
|
540 | } |
|
|
541 | } |
|
|
542 | |
|
|
543 | #endif |
|
|
544 | |
|
|
545 | // a "factory" *g* |
|
|
546 | ptytty * |
|
|
547 | new_ptytty () |
|
|
548 | { |
|
|
549 | #if PTYTTY_HELPER |
|
|
550 | if (pid > 0) |
|
|
551 | // use helper process |
|
|
552 | return new ptytty_proxy; |
|
|
553 | else |
|
|
554 | #endif |
|
|
555 | return new ptytty_unix; |
|
|
556 | } |
|
|
557 | |
312 | /*----------------------- end-of-file (C source) -----------------------*/ |
558 | /*----------------------- end-of-file (C source) -----------------------*/ |
|
|
559 | |