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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> |
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10 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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11 | * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
| 7 | * |
12 | * |
| 8 | * 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 |
| 9 | * 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 |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
15 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
16 | * (at your option) any later version. |
| … | |
… | |
| 18 | * 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 |
| 19 | * along with this program; if not, write to the Free Software |
24 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | *---------------------------------------------------------------------*/ |
26 | *---------------------------------------------------------------------*/ |
| 22 | |
27 | |
| 23 | #include "../config.h" /* NECESSARY */ |
28 | #include "../config.h" |
| 24 | |
29 | |
| 25 | /* |
30 | #include "ptytty.h" |
| 26 | * Try to be self-contained except for the above autoconfig'd defines |
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| 27 | */ |
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| 28 | |
31 | |
| 29 | #include <stdio.h> |
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| 30 | #ifdef HAVE_STDLIB_H |
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| 31 | # include <stdlib.h> |
32 | #include <cstdlib> |
| 32 | #endif |
33 | #include <cstring> |
| 33 | #ifdef HAVE_SYS_TYPES_H |
34 | #include <csignal> |
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35 | |
| 34 | # include <sys/types.h> |
36 | #include <sys/types.h> |
| 35 | #endif |
37 | #include <sys/socket.h> |
| 36 | #ifdef HAVE_UNISTD_H |
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| 37 | # include <unistd.h> |
38 | #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> |
39 | #include <fcntl.h> |
| 44 | #endif |
40 | |
| 45 | #ifdef HAVE_SYS_IOCTL_H |
41 | #ifdef HAVE_SYS_IOCTL_H |
| 46 | # include <sys/ioctl.h> |
42 | # include <sys/ioctl.h> |
| 47 | #endif |
43 | #endif |
| 48 | #if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) |
44 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
| 49 | # include <sys/stropts.h> /* for I_PUSH */ |
45 | # include <sys/stropts.h> /* for I_PUSH */ |
| 50 | #endif |
46 | #endif |
| 51 | |
47 | #ifdef HAVE_ISASTREAM |
| 52 | #ifdef DEBUG_TTY |
48 | # 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 |
49 | #endif |
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50 | #if defined(HAVE_PTY_H) |
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51 | # include <pty.h> |
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52 | #elif defined(HAVE_LIBUTIL_H) |
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53 | # include <libutil.h> |
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54 | #elif defined(HAVE_UTIL_H) |
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55 | # include <util.h> |
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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 |
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60 | |
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61 | #include <cstdio> |
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62 | |
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63 | ///////////////////////////////////////////////////////////////////////////// |
| 57 | |
64 | |
| 58 | /* ------------------------------------------------------------------------- * |
65 | /* ------------------------------------------------------------------------- * |
| 59 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
| 60 | * ------------------------------------------------------------------------- */ |
67 | * ------------------------------------------------------------------------- */ |
| 61 | /* |
68 | /* |
| 62 | * Returns pty file descriptor, or -1 on failure |
69 | * Returns pty file descriptor, or -1 on failure |
| 63 | * 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. |
| 64 | * 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 |
| 65 | */ |
72 | */ |
| 66 | /* EXTPROTO */ |
73 | #if defined(UNIX98_PTY) |
| 67 | int |
74 | static int |
| 68 | rxvt_get_pty (int *fd_tty, const char **ttydev) |
75 | get_pty (int *fd_tty, char **ttydev) |
| 69 | { |
76 | { |
| 70 | int pfd; |
77 | int pfd; |
| 71 | |
78 | |
| 72 | #ifdef PTYS_ARE_OPENPTY |
79 | # if defined(HAVE_GETPT) |
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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 | } |
| 73 | |
94 | |
| 74 | char tty_name[sizeof "/dev/pts/????\0"]; |
95 | close (pfd); |
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96 | } |
| 75 | |
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 | |
| 76 | if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) |
108 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
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109 | if (res != -1) |
| 77 | { |
110 | { |
| 78 | *ttydev = strdup (tty_name); |
111 | *ttydev = strdup (tty_name); |
| 79 | return pfd; |
112 | return pfd; |
| 80 | } |
113 | } |
| 81 | #endif |
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| 82 | |
114 | |
| 83 | #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 | |
| 84 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
| 85 | if (*ttydev != NULL) |
124 | if (*ttydev != NULL) |
| 86 | return pfd; |
125 | return pfd; |
| 87 | #endif |
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| 88 | |
126 | |
| 89 | #ifdef PTYS_ARE_GETPTY |
127 | return -1; |
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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; |
| 90 | |
134 | |
| 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) |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
| 128 | { |
136 | { |
| 129 | *ttydev = ttyname (pfd); |
137 | *ttydev = strdup (ttyname (pfd)); |
| 130 | return pfd; |
138 | return pfd; |
| 131 | } |
139 | } |
| 132 | #endif |
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| 133 | |
140 | |
| 134 | #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 | |
| 135 | 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) |
| 136 | { |
150 | { |
| 137 | *ttydev = ptsname (pfd); |
151 | *ttydev = strdup (ptsname (pfd)); |
| 138 | return pfd; |
152 | return pfd; |
| 139 | } |
153 | } |
| 140 | #endif |
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| 141 | |
154 | |
| 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; |
155 | return -1; |
| 207 | } |
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 |
| 208 | |
189 | |
| 209 | /*----------------------------------------------------------------------*/ |
190 | /*----------------------------------------------------------------------*/ |
| 210 | /* |
191 | /* |
| 211 | * Returns tty file descriptor, or -1 on failure |
192 | * Returns tty file descriptor, or -1 on failure |
| 212 | */ |
193 | */ |
| 213 | /* EXTPROTO */ |
194 | static int |
| 214 | int |
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| 215 | rxvt_get_tty (const char *ttydev) |
195 | get_tty (char *ttydev) |
| 216 | { |
196 | { |
| 217 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
197 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
| 218 | } |
198 | } |
| 219 | |
199 | |
| 220 | /*----------------------------------------------------------------------*/ |
200 | /*----------------------------------------------------------------------*/ |
| 221 | /* |
201 | /* |
| 222 | * 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 |
| 223 | */ |
203 | */ |
| 224 | /* EXTPROTO */ |
204 | static int |
| 225 | int |
205 | control_tty (int fd_tty) |
| 226 | rxvt_control_tty (int fd_tty, const char *ttydev) |
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| 227 | { |
206 | { |
| 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 (); |
207 | 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 | |
208 | |
| 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) |
209 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
| 259 | /* |
210 | /* |
| 260 | * Push STREAMS modules: |
211 | * Push STREAMS modules: |
| 261 | * ptem: pseudo-terminal hardware emulation module. |
212 | * ptem: pseudo-terminal hardware emulation module. |
| 262 | * ldterm: standard terminal line discipline. |
213 | * ldterm: standard terminal line discipline. |
| 263 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
214 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
| … | |
… | |
| 275 | */ |
226 | */ |
| 276 | # ifdef HAVE_ISASTREAM |
227 | # ifdef HAVE_ISASTREAM |
| 277 | if (isastream (fd_tty) == 1) |
228 | if (isastream (fd_tty) == 1) |
| 278 | # endif |
229 | # endif |
| 279 | { |
230 | { |
| 280 | D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules")); |
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| 281 | ioctl (fd_tty, I_PUSH, "ptem"); |
231 | ioctl (fd_tty, I_PUSH, "ptem"); |
| 282 | ioctl (fd_tty, I_PUSH, "ldterm"); |
232 | ioctl (fd_tty, I_PUSH, "ldterm"); |
| 283 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
233 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
| 284 | } |
234 | } |
| 285 | #endif |
235 | #endif |
| 286 | /* ---------------------------------------- */ |
236 | |
| 287 | # if defined(TIOCSCTTY) |
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| 288 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
237 | ioctl (fd_tty, TIOCSCTTY, NULL); |
| 289 | D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd)); |
238 | |
| 290 | # elif defined(TIOCSETCTTY) |
239 | int fd = open ("/dev/tty", O_WRONLY); |
| 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")); |
|
|
| 296 | if (fd >= 0) |
240 | if (fd < 0) |
|
|
241 | return -1; /* fatal */ |
|
|
242 | |
| 297 | close (fd); |
243 | close (fd); |
|
|
244 | |
|
|
245 | return 0; |
|
|
246 | } |
|
|
247 | |
|
|
248 | void |
|
|
249 | ptytty::close_tty () |
|
|
250 | { |
|
|
251 | if (tty < 0) |
|
|
252 | return; |
|
|
253 | |
|
|
254 | close (tty); |
|
|
255 | tty = -1; |
|
|
256 | } |
|
|
257 | |
|
|
258 | bool |
|
|
259 | ptytty::make_controlling_tty () |
|
|
260 | { |
|
|
261 | return control_tty (tty) >= 0; |
|
|
262 | } |
|
|
263 | |
|
|
264 | void |
|
|
265 | ptytty::set_utf8_mode (bool on) |
|
|
266 | { |
|
|
267 | #ifdef IUTF8 |
|
|
268 | if (pty < 0) |
|
|
269 | return; |
|
|
270 | |
|
|
271 | struct termios tio; |
|
|
272 | |
|
|
273 | if (tcgetattr (pty, &tio) != -1) |
|
|
274 | { |
|
|
275 | tcflag_t new_cflag = tio.c_iflag; |
|
|
276 | |
|
|
277 | if (on) |
|
|
278 | new_cflag |= IUTF8; |
|
|
279 | else |
|
|
280 | new_cflag &= ~IUTF8; |
|
|
281 | |
|
|
282 | if (new_cflag != tio.c_iflag) |
|
|
283 | { |
|
|
284 | tio.c_iflag = new_cflag; |
|
|
285 | tcsetattr (pty, TCSANOW, &tio); |
|
|
286 | } |
|
|
287 | } |
|
|
288 | #endif |
|
|
289 | } |
|
|
290 | |
|
|
291 | static struct ttyconf { |
|
|
292 | gid_t gid; |
|
|
293 | mode_t mode; |
|
|
294 | |
|
|
295 | ttyconf () |
|
|
296 | { |
|
|
297 | #ifdef TTY_GID_SUPPORT |
|
|
298 | struct group *gr = getgrnam ("tty"); |
|
|
299 | |
|
|
300 | if (gr) |
|
|
301 | { /* change group ownership of tty to "tty" */ |
|
|
302 | mode = S_IRUSR | S_IWUSR | S_IWGRP; |
|
|
303 | gid = gr->gr_gid; |
|
|
304 | } |
|
|
305 | else |
|
|
306 | #endif /* TTY_GID_SUPPORT */ |
|
|
307 | { |
|
|
308 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
|
|
309 | gid = 0; |
|
|
310 | } |
|
|
311 | } |
|
|
312 | } ttyconf; |
|
|
313 | |
|
|
314 | ptytty_unix::ptytty_unix () |
|
|
315 | { |
|
|
316 | name = 0; |
|
|
317 | #if UTMP_SUPPORT |
|
|
318 | cmd_pid = 0; |
|
|
319 | #endif |
|
|
320 | } |
|
|
321 | |
|
|
322 | ptytty_unix::~ptytty_unix () |
|
|
323 | { |
|
|
324 | #if UTMP_SUPPORT |
|
|
325 | logout (); |
|
|
326 | #endif |
|
|
327 | put (); |
|
|
328 | } |
|
|
329 | |
|
|
330 | void |
|
|
331 | ptytty_unix::put () |
|
|
332 | { |
|
|
333 | chmod (name, RESTORE_TTY_MODE); |
|
|
334 | chown (name, 0, ttyconf.gid); |
|
|
335 | |
|
|
336 | close_tty (); |
|
|
337 | |
|
|
338 | if (pty >= 0) |
|
|
339 | close (pty); |
|
|
340 | |
|
|
341 | free (name); |
|
|
342 | |
|
|
343 | pty = tty = -1; |
|
|
344 | name = 0; |
|
|
345 | } |
|
|
346 | |
|
|
347 | bool |
|
|
348 | ptytty_unix::get () |
|
|
349 | { |
|
|
350 | /* get master (pty) */ |
|
|
351 | if ((pty = get_pty (&tty, &name)) < 0) |
|
|
352 | return false; |
|
|
353 | |
|
|
354 | fcntl (pty, F_SETFL, O_NONBLOCK); |
|
|
355 | |
|
|
356 | /* get slave (tty) */ |
|
|
357 | if (tty < 0) |
|
|
358 | { |
|
|
359 | #ifndef NO_SETOWNER_TTYDEV |
|
|
360 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
361 | chmod (name, ttyconf.mode); |
|
|
362 | # ifdef HAVE_REVOKE |
|
|
363 | revoke (name); |
| 298 | # endif |
364 | # endif |
| 299 | /* ---------------------------------------- */ |
365 | #endif |
| 300 | 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)")); |
|
|
| 302 | if (fd < 0) |
|
|
| 303 | return -1; /* fatal */ |
|
|
| 304 | close (fd); |
|
|
| 305 | /* ---------------------------------------- */ |
|
|
| 306 | D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ())); |
|
|
| 307 | /* ---------------------------------------- */ |
|
|
| 308 | #endif /* ! __QNX__ */ |
|
|
| 309 | |
366 | |
|
|
367 | if ((tty = get_tty (name)) < 0) |
|
|
368 | { |
|
|
369 | put (); |
|
|
370 | return false; |
|
|
371 | } |
|
|
372 | } |
|
|
373 | |
|
|
374 | return true; |
|
|
375 | } |
|
|
376 | |
|
|
377 | ///////////////////////////////////////////////////////////////////////////// |
|
|
378 | // helper/proxy support |
|
|
379 | |
|
|
380 | #if PTYTTY_HELPER |
|
|
381 | |
|
|
382 | static int sock_fd = -1, lock_fd = -1; |
|
|
383 | static int helper_pid, owner_pid; |
|
|
384 | |
|
|
385 | struct command |
|
|
386 | { |
|
|
387 | enum { get, login, destroy } type; |
|
|
388 | |
|
|
389 | ptytty *id; |
|
|
390 | |
|
|
391 | bool login_shell; |
|
|
392 | int cmd_pid; |
|
|
393 | char hostname[512]; // arbitrary, but should be plenty |
|
|
394 | }; |
|
|
395 | |
|
|
396 | struct ptytty_proxy : ptytty |
|
|
397 | { |
|
|
398 | ptytty *id; |
|
|
399 | |
|
|
400 | ptytty_proxy () |
|
|
401 | : id(0) |
|
|
402 | { |
|
|
403 | } |
|
|
404 | |
|
|
405 | ~ptytty_proxy (); |
|
|
406 | |
|
|
407 | bool get (); |
|
|
408 | void login (int cmd_pid, bool login_shell, const char *hostname); |
|
|
409 | }; |
|
|
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 | |
|
|
419 | bool |
|
|
420 | ptytty_proxy::get () |
|
|
421 | { |
|
|
422 | NEED_TOKEN; |
|
|
423 | |
|
|
424 | command cmd; |
|
|
425 | |
|
|
426 | cmd.type = command::get; |
|
|
427 | |
|
|
428 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
429 | |
|
|
430 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
|
|
431 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
|
|
432 | |
|
|
433 | if (!id) |
|
|
434 | { |
|
|
435 | GIVE_TOKEN; |
|
|
436 | return false; |
|
|
437 | } |
|
|
438 | |
|
|
439 | if ((pty = recv_fd (sock_fd)) < 0 |
|
|
440 | || (tty = recv_fd (sock_fd)) < 0) |
|
|
441 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
|
|
442 | |
|
|
443 | GIVE_TOKEN; |
|
|
444 | return true; |
|
|
445 | } |
|
|
446 | |
|
|
447 | void |
|
|
448 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
|
|
449 | { |
|
|
450 | NEED_TOKEN; |
|
|
451 | |
|
|
452 | command cmd; |
|
|
453 | |
|
|
454 | cmd.type = command::login; |
|
|
455 | cmd.id = id; |
|
|
456 | cmd.cmd_pid = cmd_pid; |
|
|
457 | cmd.login_shell = login_shell; |
|
|
458 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
|
|
459 | |
|
|
460 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
461 | |
|
|
462 | GIVE_TOKEN; |
|
|
463 | } |
|
|
464 | |
|
|
465 | ptytty_proxy::~ptytty_proxy () |
|
|
466 | { |
|
|
467 | if (id) |
|
|
468 | { |
|
|
469 | NEED_TOKEN; |
|
|
470 | |
|
|
471 | command cmd; |
|
|
472 | |
|
|
473 | cmd.type = command::destroy; |
|
|
474 | cmd.id = id; |
|
|
475 | |
|
|
476 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
477 | |
|
|
478 | GIVE_TOKEN; |
|
|
479 | } |
|
|
480 | } |
|
|
481 | |
|
|
482 | static |
|
|
483 | void serve () |
|
|
484 | { |
|
|
485 | command cmd; |
|
|
486 | vector<ptytty *> ptys; |
|
|
487 | |
|
|
488 | for (;;) |
|
|
489 | { |
|
|
490 | GIVE_TOKEN; |
|
|
491 | |
|
|
492 | if (read (sock_fd, &cmd, sizeof (command)) != sizeof (command)) |
|
|
493 | break; |
|
|
494 | |
|
|
495 | if (cmd.type == command::get) |
|
|
496 | { |
|
|
497 | // -> id ptyfd ttyfd |
|
|
498 | cmd.id = new ptytty_unix; |
|
|
499 | |
|
|
500 | if (cmd.id->get ()) |
|
|
501 | { |
|
|
502 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
503 | ptys.push_back (cmd.id); |
|
|
504 | |
|
|
505 | ptytty::send_fd (sock_fd, cmd.id->pty); |
|
|
506 | ptytty::send_fd (sock_fd, cmd.id->tty); |
|
|
507 | } |
|
|
508 | else |
|
|
509 | { |
|
|
510 | delete cmd.id; |
|
|
511 | cmd.id = 0; |
|
|
512 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
513 | } |
|
|
514 | } |
|
|
515 | else if (cmd.type == command::login) |
|
|
516 | { |
|
|
517 | #if UTMP_SUPPORT |
|
|
518 | if (find (ptys.begin (), ptys.end (), cmd.id) != ptys.end ()) |
|
|
519 | { |
|
|
520 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
|
|
521 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
|
|
522 | } |
|
|
523 | #endif |
|
|
524 | } |
|
|
525 | else if (cmd.type == command::destroy) |
|
|
526 | { |
|
|
527 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
|
|
528 | |
|
|
529 | if (pty != ptys.end ()) |
|
|
530 | { |
|
|
531 | delete *pty; |
|
|
532 | ptys.erase (pty); |
|
|
533 | } |
|
|
534 | } |
|
|
535 | else |
|
|
536 | break; |
|
|
537 | |
|
|
538 | NEED_TOKEN; |
|
|
539 | } |
|
|
540 | |
|
|
541 | // destroy all ptys |
|
|
542 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
|
|
543 | delete *i; |
|
|
544 | } |
|
|
545 | |
|
|
546 | void |
|
|
547 | ptytty::use_helper () |
|
|
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 | ) |
| 310 | return 0; |
558 | return; |
|
|
559 | |
|
|
560 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
561 | owner_pid = pid; |
|
|
562 | #endif |
|
|
563 | |
|
|
564 | int sv[2]; |
|
|
565 | |
|
|
566 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
|
|
567 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
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 | |
|
|
576 | helper_pid = fork (); |
|
|
577 | |
|
|
578 | if (helper_pid < 0) |
|
|
579 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
|
|
580 | |
|
|
581 | if (helper_pid) |
|
|
582 | { |
|
|
583 | // client, process |
|
|
584 | sock_fd = sv[0]; |
|
|
585 | close (sv[1]); |
|
|
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 |
|
|
592 | } |
|
|
593 | else |
|
|
594 | { |
|
|
595 | // server, pty-helper |
|
|
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); |
|
|
607 | |
|
|
608 | for (int fd = 0; fd < 1023; fd++) |
|
|
609 | if (fd != sock_fd && fd != lock_fd) |
|
|
610 | close (fd); |
|
|
611 | |
|
|
612 | serve (); |
|
|
613 | _exit (EXIT_SUCCESS); |
|
|
614 | } |
| 311 | } |
615 | } |
| 312 | /*----------------------- end-of-file (C source) -----------------------*/ |
616 | |
|
|
617 | #endif |
|
|
618 | |
|
|
619 | ptytty * |
|
|
620 | ptytty::create () |
|
|
621 | { |
|
|
622 | #if PTYTTY_HELPER |
|
|
623 | if (helper_pid |
|
|
624 | # ifndef PTYTTY_NO_PID_CHECK |
|
|
625 | && getpid () == owner_pid |
|
|
626 | # endif |
|
|
627 | ) |
|
|
628 | // use helper process |
|
|
629 | return new ptytty_proxy; |
|
|
630 | else |
|
|
631 | #endif |
|
|
632 | return new ptytty_unix; |
|
|
633 | } |
|
|
634 | |
|
|
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 |
|
|
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 | #define DEFINE_METHOD(retval, name, args1, args2) \ |
|
|
685 | extern "C" retval ptytty_ ## name args1 \ |
|
|
686 | { return ((struct ptytty *)ptytty)->name args2; } |
|
|
687 | |
|
|
688 | DEFINE_METHOD(int,pty,(void *ptytty),) |
|
|
689 | DEFINE_METHOD(int,tty,(void *ptytty),) |
|
|
690 | DEFINE_METHOD(int,get,(void *ptytty),()) |
|
|
691 | DEFINE_METHOD(void,login,(void *ptytty, int cmd_pid, bool login_shell, const char *hostname),(cmd_pid,login_shell,hostname)) |
|
|
692 | |
|
|
693 | DEFINE_METHOD(void,close_tty,(void *ptytty),()) |
|
|
694 | DEFINE_METHOD(int,make_controlling_tty,(void *ptytty),()) |
|
|
695 | DEFINE_METHOD(void,set_utf8_mode,(void *ptytty, int on),(on)) |
|
|
696 | |
|
|
697 | #define DEFINE_STATIC(retval, name, args) \ |
|
|
698 | extern "C" retval ptytty_ ## name args \ |
|
|
699 | { return ptytty::name args; } |
|
|
700 | |
|
|
701 | DEFINE_STATIC(void,drop_privileges,()) |
|
|
702 | DEFINE_STATIC(void,use_helper,()) |
|
|
703 | DEFINE_STATIC(void,init,()) |
|
|
704 | |
|
|
705 | DEFINE_STATIC(void *,create,()) |
|
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706 | |
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707 | void ptytty_delete (void *ptytty) |
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708 | { |
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709 | delete (struct ptytty *)ptytty; |
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710 | } |
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711 | |
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712 | // send_fd, recv_fd not exposed |
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713 | |
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714 | #endif |
