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fcb69e5c | 1 | /* -*- c-file-style: "linux" -*- |
e2ccd357 WD |
2 | * |
3 | * Copyright (C) 1996-2000 by Andrew Tridgell | |
fcb69e5c MP |
4 | * Copyright (C) Paul Mackerras 1996 |
5 | * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> | |
e2ccd357 | 6 | * |
fcb69e5c MP |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
e2ccd357 | 11 | * |
fcb69e5c MP |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
e2ccd357 | 16 | * |
fcb69e5c MP |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
b35d0d8e MP |
22 | #include "rsync.h" |
23 | ||
72a6e631 WD |
24 | extern int am_sender; |
25 | extern int am_server; | |
26 | extern int blocking_io; | |
27 | extern int orig_umask; | |
72a6e631 WD |
28 | extern int filesfrom_fd; |
29 | ||
b35d0d8e | 30 | /** |
20c1926a | 31 | * Create a child connected to us via its stdin/stdout. |
b35d0d8e | 32 | * |
e2ccd357 WD |
33 | * This is derived from CVS code |
34 | * | |
b35d0d8e MP |
35 | * Note that in the child STDIN is set to blocking and STDOUT |
36 | * is set to non-blocking. This is necessary as rsh relies on stdin being blocking | |
37 | * and ssh relies on stdout being non-blocking | |
38 | * | |
39 | * If blocking_io is set then use blocking io on both fds. That can be | |
40 | * used to cope with badly broken rsh implementations like the one on | |
41 | * Solaris. | |
42 | **/ | |
43 | pid_t piped_child(char **command, int *f_in, int *f_out) | |
44 | { | |
45 | pid_t pid; | |
46 | int to_child_pipe[2]; | |
47 | int from_child_pipe[2]; | |
e2ccd357 | 48 | |
b35d0d8e MP |
49 | if (verbose >= 2) { |
50 | print_child_argv(command); | |
51 | } | |
52 | ||
53 | if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 54 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
55 | exit_cleanup(RERR_IPC); |
56 | } | |
57 | ||
b35d0d8e MP |
58 | pid = do_fork(); |
59 | if (pid == -1) { | |
d62bcc17 | 60 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
61 | exit_cleanup(RERR_IPC); |
62 | } | |
63 | ||
64 | if (pid == 0) { | |
b35d0d8e MP |
65 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
66 | close(to_child_pipe[1]) < 0 || | |
67 | close(from_child_pipe[0]) < 0 || | |
68 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 69 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
70 | exit_cleanup(RERR_IPC); |
71 | } | |
72 | if (to_child_pipe[0] != STDIN_FILENO) | |
73 | close(to_child_pipe[0]); | |
74 | if (from_child_pipe[1] != STDOUT_FILENO) | |
75 | close(from_child_pipe[1]); | |
76 | umask(orig_umask); | |
77 | set_blocking(STDIN_FILENO); | |
7d3f8ae2 | 78 | if (blocking_io > 0) |
b35d0d8e | 79 | set_blocking(STDOUT_FILENO); |
b35d0d8e | 80 | execvp(command[0], command); |
45c49b52 | 81 | rsyserr(FERROR, errno, "Failed to exec %s", command[0]); |
b35d0d8e MP |
82 | exit_cleanup(RERR_IPC); |
83 | } | |
84 | ||
85 | if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) { | |
d62bcc17 | 86 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
87 | exit_cleanup(RERR_IPC); |
88 | } | |
89 | ||
90 | *f_in = from_child_pipe[0]; | |
91 | *f_out = to_child_pipe[1]; | |
92 | ||
93 | return pid; | |
94 | } | |
95 | ||
391516da | 96 | /* This function forks a child which calls child_main(). First, |
b9f592fb WD |
97 | * however, it has to establish communication paths to and from the |
98 | * newborn child. It creates two socket pairs -- one for writing to | |
99 | * the child (from the parent) and one for reading from the child | |
100 | * (writing to the parent). Since that's four socket ends, each | |
101 | * process has to close the two ends it doesn't need. The remaining | |
102 | * two socket ends are retained for reading and writing. In the | |
103 | * child, the STDIN and STDOUT file descriptors refer to these | |
104 | * sockets. In the parent, the function arguments f_in and f_out are | |
391516da | 105 | * set to refer to these sockets. */ |
b9f592fb | 106 | pid_t local_child(int argc, char **argv, int *f_in, int *f_out, |
b44be3e9 | 107 | int (*child_main)(int, char*[])) |
b35d0d8e MP |
108 | { |
109 | pid_t pid; | |
110 | int to_child_pipe[2]; | |
111 | int from_child_pipe[2]; | |
b35d0d8e MP |
112 | |
113 | if (fd_pair(to_child_pipe) < 0 || | |
114 | fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 115 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
116 | exit_cleanup(RERR_IPC); |
117 | } | |
118 | ||
8c90957f | 119 | pid = do_fork(); |
b35d0d8e | 120 | if (pid == -1) { |
d62bcc17 | 121 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
122 | exit_cleanup(RERR_IPC); |
123 | } | |
124 | ||
125 | if (pid == 0) { | |
b9f592fb | 126 | am_sender = !am_sender; |
e2ccd357 | 127 | am_server = 1; |
b35d0d8e | 128 | |
7c2a9e76 WD |
129 | if (!am_sender) |
130 | filesfrom_fd = -1; | |
131 | ||
b35d0d8e MP |
132 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
133 | close(to_child_pipe[1]) < 0 || | |
134 | close(from_child_pipe[0]) < 0 || | |
135 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 136 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
137 | exit_cleanup(RERR_IPC); |
138 | } | |
3896bca4 WD |
139 | if (to_child_pipe[0] != STDIN_FILENO) |
140 | close(to_child_pipe[0]); | |
141 | if (from_child_pipe[1] != STDOUT_FILENO) | |
142 | close(from_child_pipe[1]); | |
b35d0d8e MP |
143 | child_main(argc, argv); |
144 | } | |
145 | ||
7c2a9e76 WD |
146 | if (!am_sender) |
147 | filesfrom_fd = -1; | |
148 | ||
b35d0d8e MP |
149 | if (close(from_child_pipe[1]) < 0 || |
150 | close(to_child_pipe[0]) < 0) { | |
e2ccd357 | 151 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
152 | exit_cleanup(RERR_IPC); |
153 | } | |
154 | ||
155 | *f_in = from_child_pipe[0]; | |
156 | *f_out = to_child_pipe[1]; | |
e2ccd357 | 157 | |
b35d0d8e MP |
158 | return pid; |
159 | } |