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1 | // This file is part of libptytty. Do not make local modifications. |
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2 | // http://software.schmorp.de/pkg/libptytty |
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3 | |
1 | /*--------------------------------*-C-*---------------------------------* |
4 | /*----------------------------------------------------------------------* |
2 | * File: ptytty.C |
5 | * File: ptytty.C |
3 | *----------------------------------------------------------------------* |
6 | *----------------------------------------------------------------------* |
4 | * |
7 | * |
5 | * All portions of code are copyright by their respective author/s. |
8 | * All portions of code are copyright by their respective author/s. |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
9 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
10 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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11 | * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
8 | * |
12 | * |
9 | * This program is free software; you can redistribute it and/or modify |
13 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
14 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2 of the License, or |
15 | * the Free Software Foundation; either version 2 of the License, or |
12 | * (at your option) any later version. |
16 | * (at your option) any later version. |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
23 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
24 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
26 | *---------------------------------------------------------------------*/ |
23 | |
27 | |
24 | #include "../config.h" /* NECESSARY */ |
28 | #include "../config.h" |
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29 | |
25 | #include "rxvt.h" |
30 | #include "ptytty.h" |
26 | |
31 | |
27 | #include <cstdlib> |
32 | #include <cstdlib> |
28 | #include <cstring> |
33 | #include <cstring> |
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34 | #include <csignal> |
29 | |
35 | |
30 | #include <sys/types.h> |
36 | #include <sys/types.h> |
31 | #include <sys/socket.h> |
37 | #include <sys/socket.h> |
32 | #include <unistd.h> |
38 | #include <unistd.h> |
33 | #include <fcntl.h> |
39 | #include <fcntl.h> |
34 | |
40 | |
35 | #ifdef HAVE_SYS_IOCTL_H |
41 | #ifdef HAVE_SYS_IOCTL_H |
36 | # include <sys/ioctl.h> |
42 | # include <sys/ioctl.h> |
37 | #endif |
43 | #endif |
38 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
44 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
45 | # include <sys/stropts.h> /* for I_PUSH */ |
40 | #endif |
46 | #endif |
41 | #ifdef HAVE_ISASTREAM |
47 | #ifdef HAVE_ISASTREAM |
42 | # include <stropts.h> |
48 | # include <stropts.h> |
43 | #endif |
49 | #endif |
… | |
… | |
46 | #elif defined(HAVE_LIBUTIL_H) |
52 | #elif defined(HAVE_LIBUTIL_H) |
47 | # include <libutil.h> |
53 | # include <libutil.h> |
48 | #elif defined(HAVE_UTIL_H) |
54 | #elif defined(HAVE_UTIL_H) |
49 | # include <util.h> |
55 | # include <util.h> |
50 | #endif |
56 | #endif |
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57 | #ifdef TTY_GID_SUPPORT |
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58 | #include <grp.h> |
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59 | #endif |
51 | |
60 | |
52 | #include <cstdio> |
61 | #include <cstdio> |
53 | #include <grp.h> |
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54 | |
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55 | #include "rxvtutil.h" |
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56 | #include "fdpass.h" |
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57 | #include "ptytty.h" |
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58 | |
62 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
63 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
64 | |
61 | /* ------------------------------------------------------------------------- * |
65 | /* ------------------------------------------------------------------------- * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
… | |
… | |
64 | /* |
68 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
69 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
70 | * If successful, ttydev is set to the name of the slave device. |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
71 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
72 | */ |
69 | static inline int |
73 | #if defined(UNIX98_PTY) |
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74 | static int |
70 | get_pty_streams (int *fd_tty, char **ttydev) |
75 | get_pty (int *fd_tty, char **ttydev) |
71 | { |
76 | { |
72 | #ifdef NO_SETOWNER_TTYDEV |
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73 | int pfd; |
77 | int pfd; |
74 | |
78 | |
75 | # if defined(PTYS_ARE_GETPT) |
79 | # if defined(HAVE_GETPT) |
76 | pfd = getpt(); |
80 | pfd = getpt(); |
77 | # elif defined(PTYS_ARE_POSIX) |
81 | # elif defined(HAVE_POSIX_OPENPT) |
78 | pfd = posix_openpt (O_RDWR); |
82 | pfd = posix_openpt (O_RDWR); |
79 | # else |
83 | # else |
80 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
84 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
81 | # endif |
85 | # endif |
82 | if (pfd >= 0) |
86 | if (pfd >= 0) |
83 | { |
87 | { |
84 | if (grantpt (pfd) == 0 /* change slave permissions */ |
88 | if (grantpt (pfd) == 0 /* change slave permissions */ |
85 | && unlockpt (pfd) == 0) |
89 | && unlockpt (pfd) == 0) |
… | |
… | |
88 | return pfd; |
92 | return pfd; |
89 | } |
93 | } |
90 | |
94 | |
91 | close (pfd); |
95 | close (pfd); |
92 | } |
96 | } |
93 | #endif |
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94 | |
97 | |
95 | return -1; |
98 | return -1; |
96 | } |
99 | } |
97 | |
100 | #elif defined(HAVE_OPENPTY) |
98 | static inline int |
101 | static int |
99 | get_pty_openpty (int *fd_tty, char **ttydev) |
102 | get_pty (int *fd_tty, char **ttydev) |
100 | { |
103 | { |
101 | #ifdef PTYS_ARE_OPENPTY |
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102 | int pfd; |
104 | int pfd; |
103 | int res; |
105 | int res; |
104 | char tty_name[sizeof "/dev/pts/????\0"]; |
106 | char tty_name[32]; |
105 | |
107 | |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
108 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
107 | if (res != -1) |
109 | if (res != -1) |
108 | { |
110 | { |
109 | *ttydev = strdup (tty_name); |
111 | *ttydev = strdup (tty_name); |
110 | return pfd; |
112 | return pfd; |
111 | } |
113 | } |
112 | #endif |
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113 | |
114 | |
114 | return -1; |
115 | return -1; |
115 | } |
116 | } |
116 | |
117 | #elif defined(HAVE__GETPTY) |
117 | static inline int |
118 | static int |
118 | get_pty__getpty (int *fd_tty, char **ttydev) |
119 | get_pty (int *fd_tty, char **ttydev) |
119 | { |
120 | { |
120 | #ifdef PTYS_ARE__GETPTY |
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121 | int pfd; |
121 | int pfd; |
122 | |
122 | |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
124 | if (*ttydev != NULL) |
124 | if (*ttydev != NULL) |
125 | return pfd; |
125 | return pfd; |
126 | #endif |
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127 | |
126 | |
128 | return -1; |
127 | return -1; |
129 | } |
128 | } |
130 | |
129 | #elif defined(HAVE_DEV_PTC) |
131 | static inline int |
130 | static int |
132 | get_pty_ptc (int *fd_tty, char **ttydev) |
131 | get_pty (int *fd_tty, char **ttydev) |
133 | { |
132 | { |
134 | #ifdef PTYS_ARE_PTC |
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135 | int pfd; |
133 | int pfd; |
136 | |
134 | |
137 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
138 | { |
136 | { |
139 | *ttydev = strdup (ttyname (pfd)); |
137 | *ttydev = strdup (ttyname (pfd)); |
140 | return pfd; |
138 | return pfd; |
141 | } |
139 | } |
142 | #endif |
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143 | |
140 | |
144 | return -1; |
141 | return -1; |
145 | } |
142 | } |
146 | |
143 | #elif defined(HAVE_DEV_CLONE) |
147 | static inline int |
144 | static int |
148 | get_pty_clone (int *fd_tty, char **ttydev) |
145 | get_pty (int *fd_tty, char **ttydev) |
149 | { |
146 | { |
150 | #ifdef PTYS_ARE_CLONE |
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151 | int pfd; |
147 | int pfd; |
152 | |
148 | |
153 | 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) |
154 | { |
150 | { |
155 | *ttydev = strdup (ptsname (pfd)); |
151 | *ttydev = strdup (ptsname (pfd)); |
156 | return pfd; |
152 | return pfd; |
157 | } |
153 | } |
158 | #endif |
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159 | |
154 | |
160 | return -1; |
155 | return -1; |
161 | } |
156 | } |
162 | |
157 | #else |
163 | static inline int |
158 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
164 | get_pty_numeric (int *fd_tty, char **ttydev) |
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165 | { |
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166 | #ifdef PTYS_ARE_NUMERIC |
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167 | int pfd; |
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168 | int idx; |
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169 | char *c1, *c2; |
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170 | char pty_name[] = "/dev/ptyp???"; |
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171 | char tty_name[] = "/dev/ttyp???"; |
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172 | |
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173 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
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174 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
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175 | |
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176 | for (idx = 0; idx < 256; idx++) |
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177 | { |
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178 | sprintf (c1, "%d", idx); |
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179 | sprintf (c2, "%d", idx); |
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180 | |
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181 | if (access (tty_name, F_OK) < 0) |
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182 | { |
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183 | idx = 256; |
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184 | break; |
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185 | } |
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186 | |
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187 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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188 | { |
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189 | if (access (tty_name, R_OK | W_OK) == 0) |
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190 | { |
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191 | *ttydev = strdup (tty_name); |
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192 | return pfd; |
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193 | } |
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194 | |
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195 | close (pfd); |
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196 | } |
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197 | } |
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198 | #endif |
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199 | |
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200 | return -1; |
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201 | } |
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202 | |
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203 | static inline int |
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204 | get_pty_searched (int *fd_tty, char **ttydev) |
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205 | { |
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206 | #ifdef PTYS_ARE_SEARCHED |
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207 | # ifndef PTYCHAR1 |
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208 | # define PTYCHAR1 "pqrstuvwxyz" |
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209 | # endif |
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210 | # ifndef PTYCHAR2 |
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211 | # define PTYCHAR2 "0123456789abcdef" |
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212 | # endif |
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213 | int pfd; |
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214 | const char *c1, *c2; |
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215 | char pty_name[] = "/dev/pty??"; |
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216 | char tty_name[] = "/dev/tty??"; |
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217 | |
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218 | for (c1 = PTYCHAR1; *c1; c1++) |
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219 | { |
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220 | pty_name[ (sizeof (pty_name) - 3)] = |
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221 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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222 | |
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223 | for (c2 = PTYCHAR2; *c2; c2++) |
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224 | { |
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225 | pty_name[ (sizeof (pty_name) - 2)] = |
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226 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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227 | |
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228 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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229 | { |
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230 | if (access (tty_name, R_OK | W_OK) == 0) |
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231 | { |
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232 | *ttydev = strdup (tty_name); |
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233 | return pfd; |
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234 | } |
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235 | |
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236 | close (pfd); |
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237 | } |
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238 | } |
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239 | } |
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240 | #endif |
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241 | |
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242 | return -1; |
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243 | } |
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244 | |
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245 | static int |
159 | static int |
246 | get_pty (int *fd_tty, char **ttydev) |
160 | get_pty (int *fd_tty, char **ttydev) |
247 | { |
161 | { |
248 | int pfd; |
162 | int pfd; |
249 | |
163 | int i; |
250 | if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1 |
164 | char pty_name[32]; |
251 | || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1 |
165 | char tty_name[32]; |
252 | || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1 |
166 | const char *majors = "pqrstuvwxyzabcde"; |
253 | || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1 |
167 | const char *minors = "0123456789abcdef"; |
254 | || (pfd = get_pty_clone (fd_tty, ttydev)) != -1 |
168 | for (i = 0; i < 256; i++) |
255 | || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1 |
169 | { |
256 | || (pfd = get_pty_searched (fd_tty, ttydev)) != -1) |
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); |
257 | return pfd; |
182 | return pfd; |
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183 | } |
258 | |
184 | |
259 | return -1; |
185 | close (pfd); |
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186 | } |
260 | } |
187 | } |
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188 | #endif |
261 | |
189 | |
262 | /*----------------------------------------------------------------------*/ |
190 | /*----------------------------------------------------------------------*/ |
263 | /* |
191 | /* |
264 | * Returns tty file descriptor, or -1 on failure |
192 | * Returns tty file descriptor, or -1 on failure |
265 | */ |
193 | */ |
… | |
… | |
276 | static int |
204 | static int |
277 | control_tty (int fd_tty) |
205 | control_tty (int fd_tty) |
278 | { |
206 | { |
279 | setsid (); |
207 | setsid (); |
280 | |
208 | |
281 | # if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
209 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
282 | /* |
210 | /* |
283 | * Push STREAMS modules: |
211 | * Push STREAMS modules: |
284 | * ptem: pseudo-terminal hardware emulation module. |
212 | * ptem: pseudo-terminal hardware emulation module. |
285 | * ldterm: standard terminal line discipline. |
213 | * ldterm: standard terminal line discipline. |
286 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
214 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
… | |
294 | * documentation is really unclear about whether it is any close () on |
222 | * documentation is really unclear about whether it is any close () on |
295 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
223 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
296 | * close () - on the master side which causes a hang up to be sent |
224 | * close () - on the master side which causes a hang up to be sent |
297 | * through - Geoff Wing |
225 | * through - Geoff Wing |
298 | */ |
226 | */ |
299 | # ifdef HAVE_ISASTREAM |
227 | # ifdef HAVE_ISASTREAM |
300 | if (isastream (fd_tty) == 1) |
228 | if (isastream (fd_tty) == 1) |
301 | # endif |
229 | # endif |
302 | { |
230 | { |
303 | ioctl (fd_tty, I_PUSH, "ptem"); |
231 | ioctl (fd_tty, I_PUSH, "ptem"); |
304 | ioctl (fd_tty, I_PUSH, "ldterm"); |
232 | ioctl (fd_tty, I_PUSH, "ldterm"); |
305 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
233 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
306 | } |
234 | } |
307 | # endif |
235 | #endif |
308 | |
236 | |
309 | ioctl (fd_tty, TIOCSCTTY, NULL); |
237 | ioctl (fd_tty, TIOCSCTTY, NULL); |
310 | |
238 | |
311 | int fd = open ("/dev/tty", O_WRONLY); |
239 | int fd = open ("/dev/tty", O_WRONLY); |
312 | if (fd < 0) |
240 | if (fd < 0) |
313 | return -1; /* fatal */ |
241 | return -1; /* fatal */ |
314 | |
242 | |
315 | close (fd); |
243 | close (fd); |
316 | |
244 | |
317 | return 0; |
245 | return 0; |
318 | } |
246 | } |
319 | |
247 | |
320 | void |
248 | void |
321 | rxvt_ptytty::close_tty () |
249 | ptytty::close_tty () |
322 | { |
250 | { |
323 | if (tty < 0) |
251 | if (tty < 0) |
324 | return; |
252 | return; |
325 | |
253 | |
326 | close (tty); |
254 | close (tty); |
327 | tty = -1; |
255 | tty = -1; |
328 | } |
256 | } |
329 | |
257 | |
330 | bool |
258 | bool |
331 | rxvt_ptytty::make_controlling_tty () |
259 | ptytty::make_controlling_tty () |
332 | { |
260 | { |
333 | return control_tty (tty) >= 0; |
261 | return control_tty (tty) >= 0; |
334 | } |
262 | } |
335 | |
263 | |
336 | void |
264 | void |
337 | rxvt_ptytty::set_utf8_mode (bool on) |
265 | ptytty::set_utf8_mode (bool on) |
338 | { |
266 | { |
339 | #ifdef IUTF8 |
267 | #ifdef IUTF8 |
340 | if (pty < 0) |
268 | if (pty < 0) |
341 | return; |
269 | return; |
342 | |
270 | |
… | |
… | |
358 | } |
286 | } |
359 | } |
287 | } |
360 | #endif |
288 | #endif |
361 | } |
289 | } |
362 | |
290 | |
363 | ///////////////////////////////////////////////////////////////////////////// |
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364 | |
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365 | #ifndef NO_SETOWNER_TTYDEV |
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366 | static struct ttyconf { |
291 | static struct ttyconf { |
367 | gid_t gid; |
292 | gid_t gid; |
368 | mode_t mode; |
293 | mode_t mode; |
369 | |
294 | |
370 | ttyconf () |
295 | ttyconf () |
… | |
… | |
379 | } |
304 | } |
380 | else |
305 | else |
381 | #endif /* TTY_GID_SUPPORT */ |
306 | #endif /* TTY_GID_SUPPORT */ |
382 | { |
307 | { |
383 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
308 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
384 | gid = getgid (); |
309 | gid = 0; |
385 | } |
310 | } |
386 | } |
311 | } |
387 | } ttyconf; |
312 | } ttyconf; |
388 | |
313 | |
389 | ///////////////////////////////////////////////////////////////////////////// |
314 | ptytty_unix::ptytty_unix () |
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315 | { |
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316 | name = 0; |
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317 | #if UTMP_SUPPORT |
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318 | cmd_pid = 0; |
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319 | #endif |
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320 | } |
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321 | |
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322 | ptytty_unix::~ptytty_unix () |
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323 | { |
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324 | #if UTMP_SUPPORT |
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325 | logout (); |
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326 | #endif |
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327 | put (); |
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328 | } |
390 | |
329 | |
391 | void |
330 | void |
392 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
331 | ptytty_unix::put () |
393 | { |
332 | { |
394 | if (!name || !*name) |
333 | chmod (name, RESTORE_TTY_MODE); |
395 | return; |
334 | chown (name, 0, ttyconf.gid); |
396 | |
335 | |
397 | if (action == SAVE) |
336 | close_tty (); |
398 | { |
|
|
399 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
400 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
|
|
401 | if (lstat (name, &savestat) < 0) /* you lose out */ |
|
|
402 | ; |
|
|
403 | else |
|
|
404 | # endif |
|
|
405 | { |
|
|
406 | saved = true; |
|
|
407 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
408 | chmod (name, ttyconf.mode); |
|
|
409 | # ifdef HAVE_REVOKE |
|
|
410 | revoke (name); |
|
|
411 | # endif |
|
|
412 | } |
|
|
413 | } |
|
|
414 | else |
|
|
415 | { /* action == RESTORE */ |
|
|
416 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
417 | if (saved) |
|
|
418 | { |
|
|
419 | chmod (name, savestat.st_mode); |
|
|
420 | chown (name, savestat.st_uid, savestat.st_gid); |
|
|
421 | } |
|
|
422 | # else |
|
|
423 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
|
|
424 | chown (name, 0, 0); |
|
|
425 | # endif |
|
|
426 | } |
|
|
427 | } |
|
|
428 | #endif |
|
|
429 | |
337 | |
430 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
338 | if (pty >= 0) |
431 | { |
339 | close (pty); |
|
|
340 | |
|
|
341 | free (name); |
|
|
342 | |
432 | pty = tty = -1; |
343 | pty = tty = -1; |
433 | name = 0; |
344 | name = 0; |
434 | #ifndef NO_SETOWNER_TTYDEV |
|
|
435 | saved = false; |
|
|
436 | #endif |
|
|
437 | #if UTMP_SUPPORT |
|
|
438 | cmd_pid = 0; |
|
|
439 | #endif |
|
|
440 | } |
|
|
441 | |
|
|
442 | rxvt_ptytty_unix::~rxvt_ptytty_unix () |
|
|
443 | { |
|
|
444 | #if UTMP_SUPPORT |
|
|
445 | logout (); |
|
|
446 | #endif |
|
|
447 | put (); |
|
|
448 | } |
|
|
449 | |
|
|
450 | void |
|
|
451 | rxvt_ptytty_unix::put () |
|
|
452 | { |
|
|
453 | #ifndef NO_SETOWNER_TTYDEV |
|
|
454 | privileges (RESTORE); |
|
|
455 | #endif |
|
|
456 | |
|
|
457 | if (pty >= 0) close (pty); |
|
|
458 | close_tty (); |
|
|
459 | free (name); |
|
|
460 | |
|
|
461 | pty = tty = -1; |
|
|
462 | name = 0; |
|
|
463 | } |
345 | } |
464 | |
346 | |
465 | bool |
347 | bool |
466 | rxvt_ptytty_unix::get () |
348 | ptytty_unix::get () |
467 | { |
349 | { |
468 | /* get master (pty) */ |
350 | /* get master (pty) */ |
469 | if ((pty = get_pty (&tty, &name)) < 0) |
351 | if ((pty = get_pty (&tty, &name)) < 0) |
470 | return false; |
352 | return false; |
471 | |
353 | |
… | |
… | |
473 | |
355 | |
474 | /* get slave (tty) */ |
356 | /* get slave (tty) */ |
475 | if (tty < 0) |
357 | if (tty < 0) |
476 | { |
358 | { |
477 | #ifndef NO_SETOWNER_TTYDEV |
359 | #ifndef NO_SETOWNER_TTYDEV |
478 | privileges (SAVE); |
360 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
361 | chmod (name, ttyconf.mode); |
|
|
362 | # ifdef HAVE_REVOKE |
|
|
363 | revoke (name); |
|
|
364 | # endif |
479 | #endif |
365 | #endif |
480 | |
366 | |
481 | if ((tty = get_tty (name)) < 0) |
367 | if ((tty = get_tty (name)) < 0) |
482 | { |
368 | { |
483 | put (); |
369 | put (); |
… | |
… | |
486 | } |
372 | } |
487 | |
373 | |
488 | return true; |
374 | return true; |
489 | } |
375 | } |
490 | |
376 | |
|
|
377 | ///////////////////////////////////////////////////////////////////////////// |
|
|
378 | // helper/proxy support |
|
|
379 | |
491 | #if PTYTTY_HELPER |
380 | #if PTYTTY_HELPER |
492 | |
381 | |
493 | static int sock_fd; |
382 | static int sock_fd = -1, lock_fd = -1; |
494 | static int pid; |
383 | static int helper_pid, owner_pid; |
495 | |
384 | |
496 | struct command |
385 | struct command |
497 | { |
386 | { |
498 | enum { get, login, destroy } type; |
387 | enum { get, login, destroy } type; |
499 | |
388 | |
500 | rxvt_ptytty *id; |
389 | ptytty *id; |
501 | |
390 | |
502 | bool login_shell; |
391 | bool login_shell; |
503 | int cmd_pid; |
392 | int cmd_pid; |
504 | char hostname[512]; // arbitrary, but should be plenty |
393 | char hostname[512]; // arbitrary, but should be plenty |
505 | }; |
394 | }; |
506 | |
395 | |
507 | struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
396 | struct ptytty_proxy : ptytty |
508 | { |
397 | { |
509 | rxvt_ptytty *id; |
398 | ptytty *id; |
510 | |
399 | |
|
|
400 | ptytty_proxy () |
|
|
401 | : id(0) |
|
|
402 | { |
|
|
403 | } |
|
|
404 | |
511 | ~rxvt_ptytty_proxy (); |
405 | ~ptytty_proxy (); |
512 | |
406 | |
513 | bool get (); |
407 | bool get (); |
514 | void login (int cmd_pid, bool login_shell, const char *hostname); |
408 | void login (int cmd_pid, bool login_shell, const char *hostname); |
515 | }; |
409 | }; |
516 | |
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 | |
517 | bool |
419 | bool |
518 | rxvt_ptytty_proxy::get () |
420 | ptytty_proxy::get () |
519 | { |
421 | { |
|
|
422 | NEED_TOKEN; |
|
|
423 | |
520 | command cmd; |
424 | command cmd; |
521 | |
425 | |
522 | cmd.type = command::get; |
426 | cmd.type = command::get; |
523 | |
427 | |
524 | write (sock_fd, &cmd, sizeof (cmd)); |
428 | write (sock_fd, &cmd, sizeof (cmd)); |
525 | |
429 | |
526 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
430 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
527 | rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
431 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
528 | |
432 | |
529 | if (!id) |
433 | if (!id) |
|
|
434 | { |
|
|
435 | GIVE_TOKEN; |
530 | return false; |
436 | return false; |
|
|
437 | } |
531 | |
438 | |
532 | if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
439 | if ((pty = recv_fd (sock_fd)) < 0 |
533 | || (tty = rxvt_recv_fd (sock_fd)) < 0) |
440 | || (tty = recv_fd (sock_fd)) < 0) |
534 | rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
441 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
535 | |
442 | |
|
|
443 | GIVE_TOKEN; |
536 | return true; |
444 | return true; |
537 | } |
445 | } |
538 | |
446 | |
539 | void |
447 | void |
540 | rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
448 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
541 | { |
449 | { |
|
|
450 | NEED_TOKEN; |
|
|
451 | |
542 | command cmd; |
452 | command cmd; |
543 | |
453 | |
544 | cmd.type = command::login; |
454 | cmd.type = command::login; |
545 | cmd.id = id; |
455 | cmd.id = id; |
546 | cmd.cmd_pid = cmd_pid; |
456 | cmd.cmd_pid = cmd_pid; |
547 | cmd.login_shell = login_shell; |
457 | cmd.login_shell = login_shell; |
548 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
458 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
549 | |
459 | |
550 | write (sock_fd, &cmd, sizeof (cmd)); |
460 | write (sock_fd, &cmd, sizeof (cmd)); |
551 | } |
|
|
552 | |
461 | |
|
|
462 | GIVE_TOKEN; |
|
|
463 | } |
|
|
464 | |
553 | rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
465 | ptytty_proxy::~ptytty_proxy () |
554 | { |
466 | { |
|
|
467 | if (id) |
|
|
468 | { |
|
|
469 | NEED_TOKEN; |
|
|
470 | |
555 | command cmd; |
471 | command cmd; |
556 | |
472 | |
557 | cmd.type = command::destroy; |
473 | cmd.type = command::destroy; |
558 | cmd.id = id; |
474 | cmd.id = id; |
559 | |
475 | |
560 | write (sock_fd, &cmd, sizeof (cmd)); |
476 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
477 | |
|
|
478 | GIVE_TOKEN; |
|
|
479 | } |
561 | } |
480 | } |
562 | |
481 | |
563 | static |
482 | static |
564 | void serve () |
483 | void serve () |
565 | { |
484 | { |
566 | command cmd; |
485 | command cmd; |
567 | vector<rxvt_ptytty *> ptys; |
486 | vector<ptytty *> ptys; |
568 | |
487 | |
|
|
488 | for (;;) |
|
|
489 | { |
|
|
490 | GIVE_TOKEN; |
|
|
491 | |
569 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
492 | if (read (sock_fd, &cmd, sizeof (command)) != sizeof (command)) |
570 | { |
493 | break; |
|
|
494 | |
571 | if (cmd.type == command::get) |
495 | if (cmd.type == command::get) |
572 | { |
496 | { |
573 | // -> id ptyfd ttyfd |
497 | // -> id ptyfd ttyfd |
574 | cmd.id = new rxvt_ptytty_unix; |
498 | cmd.id = new ptytty_unix; |
575 | |
499 | |
576 | if (cmd.id->get ()) |
500 | if (cmd.id->get ()) |
577 | { |
501 | { |
578 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
502 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
579 | ptys.push_back (cmd.id); |
503 | ptys.push_back (cmd.id); |
580 | |
504 | |
581 | rxvt_send_fd (sock_fd, cmd.id->pty); |
505 | ptytty::send_fd (sock_fd, cmd.id->pty); |
582 | rxvt_send_fd (sock_fd, cmd.id->tty); |
506 | ptytty::send_fd (sock_fd, cmd.id->tty); |
583 | } |
507 | } |
584 | else |
508 | else |
585 | { |
509 | { |
586 | delete cmd.id; |
510 | delete cmd.id; |
587 | cmd.id = 0; |
511 | cmd.id = 0; |
… | |
… | |
589 | } |
513 | } |
590 | } |
514 | } |
591 | else if (cmd.type == command::login) |
515 | else if (cmd.type == command::login) |
592 | { |
516 | { |
593 | #if UTMP_SUPPORT |
517 | #if UTMP_SUPPORT |
594 | if (find (ptys.begin (), ptys.end (), cmd.id)) |
518 | if (find (ptys.begin (), ptys.end (), cmd.id) != ptys.end ()) |
595 | { |
519 | { |
596 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
520 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
597 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
521 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
598 | } |
522 | } |
599 | #endif |
523 | #endif |
600 | } |
524 | } |
601 | else if (cmd.type == command::destroy) |
525 | else if (cmd.type == command::destroy) |
602 | { |
526 | { |
603 | rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
527 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
604 | |
528 | |
605 | if (pty) |
529 | if (pty != ptys.end ()) |
606 | { |
530 | { |
607 | delete *pty; |
531 | delete *pty; |
608 | ptys.erase (pty); |
532 | ptys.erase (pty); |
609 | } |
533 | } |
610 | } |
534 | } |
611 | else |
535 | else |
612 | break; |
536 | break; |
|
|
537 | |
|
|
538 | NEED_TOKEN; |
613 | } |
539 | } |
614 | |
540 | |
615 | // destroy all ptys |
541 | // destroy all ptys |
616 | for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
542 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
617 | delete *i; |
543 | delete *i; |
618 | } |
544 | } |
619 | |
545 | |
620 | void rxvt_ptytty_server () |
546 | void |
|
|
547 | ptytty::use_helper () |
621 | { |
548 | { |
|
|
549 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
550 | int pid = getpid (); |
|
|
551 | #endif |
|
|
552 | |
|
|
553 | if (sock_fd >= 0 |
|
|
554 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
555 | && pid == owner_pid |
|
|
556 | #endif |
|
|
557 | ) |
|
|
558 | return; |
|
|
559 | |
|
|
560 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
561 | owner_pid = pid; |
|
|
562 | #endif |
|
|
563 | |
622 | int sv[2]; |
564 | int sv[2]; |
623 | |
565 | |
624 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
566 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
625 | rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
567 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
626 | |
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 | |
627 | pid = fork (); |
576 | helper_pid = fork (); |
628 | |
577 | |
629 | if (pid < 0) |
578 | if (helper_pid < 0) |
630 | rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
579 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
631 | |
580 | |
632 | if (pid) |
581 | if (helper_pid) |
633 | { |
582 | { |
634 | // client, urxvt |
583 | // client, process |
635 | sock_fd = sv[0]; |
584 | sock_fd = sv[0]; |
636 | close (sv[1]); |
585 | close (sv[1]); |
637 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
586 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
587 | #ifdef PTYTTY_REENTRANT |
|
|
588 | lock_fd = lv[0]; |
|
|
589 | close (lv[1]); |
|
|
590 | fcntl (lock_fd, F_SETFD, FD_CLOEXEC); |
|
|
591 | #endif |
638 | } |
592 | } |
639 | else |
593 | else |
640 | { |
594 | { |
641 | setgid (getegid ()); |
|
|
642 | setuid (geteuid ()); |
|
|
643 | |
|
|
644 | // server, pty-helper |
595 | // server, pty-helper |
645 | sock_fd = sv[1]; |
596 | sock_fd = sv[1]; |
|
|
597 | #ifdef PTYTTY_REENTRANT |
|
|
598 | lock_fd = lv[1]; |
|
|
599 | #endif |
|
|
600 | |
|
|
601 | chdir ("/"); |
|
|
602 | |
|
|
603 | signal (SIGHUP, SIG_IGN); |
|
|
604 | signal (SIGTERM, SIG_IGN); |
|
|
605 | signal (SIGINT, SIG_IGN); |
|
|
606 | signal (SIGPIPE, SIG_IGN); |
646 | |
607 | |
647 | for (int fd = 0; fd < 1023; fd++) |
608 | for (int fd = 0; fd < 1023; fd++) |
648 | if (fd != sock_fd && fd != 1) |
609 | if (fd != sock_fd && fd != lock_fd) |
649 | close (fd); |
610 | close (fd); |
650 | |
611 | |
651 | serve (); |
612 | serve (); |
652 | _exit (EXIT_SUCCESS); |
613 | _exit (EXIT_SUCCESS); |
653 | } |
614 | } |
654 | } |
615 | } |
655 | #endif |
|
|
656 | |
616 | |
657 | // a "factory" *g* |
617 | #endif |
|
|
618 | |
658 | rxvt_ptytty * |
619 | ptytty * |
659 | rxvt_new_ptytty () |
620 | ptytty::create () |
660 | { |
621 | { |
661 | #if PTYTTY_HELPER |
622 | #if PTYTTY_HELPER |
662 | if (pid > 0) |
623 | if (helper_pid |
|
|
624 | # ifndef PTYTTY_NO_PID_CHECK |
|
|
625 | && getpid () == owner_pid |
|
|
626 | # endif |
|
|
627 | ) |
663 | // use helper process |
628 | // use helper process |
664 | return new rxvt_ptytty_proxy; |
629 | return new ptytty_proxy; |
665 | else |
630 | else |
666 | #endif |
631 | #endif |
667 | return new rxvt_ptytty_unix; |
632 | return new ptytty_unix; |
668 | } |
633 | } |
669 | |
634 | |
670 | /*----------------------- end-of-file (C source) -----------------------*/ |
635 | void |
|
|
636 | ptytty::init () |
|
|
637 | { |
|
|
638 | uid_t uid = getuid (); |
|
|
639 | gid_t gid = getgid (); |
|
|
640 | |
|
|
641 | // before doing anything else, check for setuid/setgid operation, |
|
|
642 | // start the helper process and drop privileges |
|
|
643 | if (uid != geteuid () |
|
|
644 | || gid != getegid ()) |
|
|
645 | { |
|
|
646 | #if PTYTTY_HELPER |
|
|
647 | use_helper (); |
|
|
648 | #else |
|
|
649 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
|
|
650 | #endif |
671 | |
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),()) |
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694 | DEFINE_METHOD(int,make_controlling_tty,(void *ptytty),()) |
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695 | DEFINE_METHOD(void,set_utf8_mode,(void *ptytty, int on),(on)) |
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696 | |
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697 | #define DEFINE_STATIC(retval, name, args) \ |
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698 | extern "C" retval ptytty_ ## name args \ |
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699 | { return ptytty::name args; } |
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700 | |
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701 | DEFINE_STATIC(void,drop_privileges,()) |
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702 | DEFINE_STATIC(void,use_helper,()) |
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703 | DEFINE_STATIC(void,init,()) |
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704 | |
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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 |