Commit | Line | Data |
---|---|---|
fcb69e5c MP |
1 | /* -*- c-file-style: "linux" -*- |
2 | * | |
3 | * Copyright (C) 1996-2000 by Andrew Tridgell | |
4 | * Copyright (C) Paul Mackerras 1996 | |
5 | * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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; | |
28 | extern int read_batch; | |
29 | extern int filesfrom_fd; | |
30 | ||
b35d0d8e MP |
31 | /** |
32 | * Create a child connected to use on stdin/stdout. | |
33 | * | |
34 | * This is derived from CVS code | |
35 | * | |
36 | * Note that in the child STDIN is set to blocking and STDOUT | |
37 | * is set to non-blocking. This is necessary as rsh relies on stdin being blocking | |
38 | * and ssh relies on stdout being non-blocking | |
39 | * | |
40 | * If blocking_io is set then use blocking io on both fds. That can be | |
41 | * used to cope with badly broken rsh implementations like the one on | |
42 | * Solaris. | |
43 | **/ | |
44 | pid_t piped_child(char **command, int *f_in, int *f_out) | |
45 | { | |
46 | pid_t pid; | |
47 | int to_child_pipe[2]; | |
48 | int from_child_pipe[2]; | |
b35d0d8e MP |
49 | |
50 | if (verbose >= 2) { | |
51 | print_child_argv(command); | |
52 | } | |
53 | ||
54 | if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 55 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
56 | exit_cleanup(RERR_IPC); |
57 | } | |
58 | ||
59 | ||
60 | pid = do_fork(); | |
61 | if (pid == -1) { | |
d62bcc17 | 62 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
63 | exit_cleanup(RERR_IPC); |
64 | } | |
65 | ||
66 | if (pid == 0) { | |
b35d0d8e MP |
67 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
68 | close(to_child_pipe[1]) < 0 || | |
69 | close(from_child_pipe[0]) < 0 || | |
70 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 71 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
72 | exit_cleanup(RERR_IPC); |
73 | } | |
74 | if (to_child_pipe[0] != STDIN_FILENO) | |
75 | close(to_child_pipe[0]); | |
76 | if (from_child_pipe[1] != STDOUT_FILENO) | |
77 | close(from_child_pipe[1]); | |
78 | umask(orig_umask); | |
79 | set_blocking(STDIN_FILENO); | |
7d3f8ae2 | 80 | if (blocking_io > 0) |
b35d0d8e | 81 | set_blocking(STDOUT_FILENO); |
b35d0d8e | 82 | execvp(command[0], command); |
d62bcc17 | 83 | rsyserr(FERROR, errno, "Failed to exec %s", command[0]); |
b35d0d8e MP |
84 | exit_cleanup(RERR_IPC); |
85 | } | |
86 | ||
87 | if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) { | |
d62bcc17 | 88 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
89 | exit_cleanup(RERR_IPC); |
90 | } | |
91 | ||
92 | *f_in = from_child_pipe[0]; | |
93 | *f_out = to_child_pipe[1]; | |
94 | ||
95 | return pid; | |
96 | } | |
97 | ||
98 | pid_t local_child(int argc, char **argv,int *f_in,int *f_out, | |
b44be3e9 | 99 | int (*child_main)(int, char*[])) |
b35d0d8e MP |
100 | { |
101 | pid_t pid; | |
102 | int to_child_pipe[2]; | |
103 | int from_child_pipe[2]; | |
b35d0d8e MP |
104 | |
105 | if (fd_pair(to_child_pipe) < 0 || | |
106 | fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 107 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
108 | exit_cleanup(RERR_IPC); |
109 | } | |
110 | ||
111 | ||
112 | pid = do_fork(); | |
113 | if (pid == -1) { | |
d62bcc17 | 114 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
115 | exit_cleanup(RERR_IPC); |
116 | } | |
117 | ||
118 | if (pid == 0) { | |
b35d0d8e MP |
119 | am_sender = read_batch ? 0 : !am_sender; |
120 | am_server = 1; | |
121 | ||
7c2a9e76 WD |
122 | if (!am_sender) |
123 | filesfrom_fd = -1; | |
124 | ||
b35d0d8e MP |
125 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
126 | close(to_child_pipe[1]) < 0 || | |
127 | close(from_child_pipe[0]) < 0 || | |
128 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 129 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
130 | exit_cleanup(RERR_IPC); |
131 | } | |
132 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); | |
133 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); | |
134 | child_main(argc, argv); | |
135 | } | |
136 | ||
7c2a9e76 WD |
137 | if (!am_sender) |
138 | filesfrom_fd = -1; | |
139 | ||
b35d0d8e MP |
140 | if (close(from_child_pipe[1]) < 0 || |
141 | close(to_child_pipe[0]) < 0) { | |
d62bcc17 | 142 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
143 | exit_cleanup(RERR_IPC); |
144 | } | |
145 | ||
146 | *f_in = from_child_pipe[0]; | |
147 | *f_out = to_child_pipe[1]; | |
148 | ||
149 | return pid; | |
150 | } |