Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Routines used to setup various kinds of inter-process pipes. | |
e2ccd357 | 3 | * |
0f78b815 WD |
4 | * Copyright (C) 1996-2000 Andrew Tridgell |
5 | * Copyright (C) 1996 Paul Mackerras | |
6 | * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org> | |
7 | * Copyright (C) 2004, 2005, 2006 Wayne Davison | |
e2ccd357 | 8 | * |
fcb69e5c MP |
9 | * 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 | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
e2ccd357 | 13 | * |
fcb69e5c MP |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
e2ccd357 | 18 | * |
e7c67065 WD |
19 | * You should have received a copy of the GNU General Public License along |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
fcb69e5c MP |
22 | */ |
23 | ||
b35d0d8e MP |
24 | #include "rsync.h" |
25 | ||
72a6e631 WD |
26 | extern int am_sender; |
27 | extern int am_server; | |
28 | extern int blocking_io; | |
72a6e631 | 29 | extern int filesfrom_fd; |
c5b7aa15 | 30 | extern mode_t orig_umask; |
ba30fb5c | 31 | extern struct chmod_mode_struct *chmod_modes; |
72a6e631 | 32 | |
b35d0d8e | 33 | /** |
20c1926a | 34 | * Create a child connected to us via its stdin/stdout. |
b35d0d8e | 35 | * |
e2ccd357 WD |
36 | * This is derived from CVS code |
37 | * | |
b35d0d8e MP |
38 | * Note that in the child STDIN is set to blocking and STDOUT |
39 | * is set to non-blocking. This is necessary as rsh relies on stdin being blocking | |
40 | * and ssh relies on stdout being non-blocking | |
41 | * | |
42 | * If blocking_io is set then use blocking io on both fds. That can be | |
43 | * used to cope with badly broken rsh implementations like the one on | |
44 | * Solaris. | |
45 | **/ | |
46 | pid_t piped_child(char **command, int *f_in, int *f_out) | |
47 | { | |
48 | pid_t pid; | |
49 | int to_child_pipe[2]; | |
50 | int from_child_pipe[2]; | |
e2ccd357 | 51 | |
b35d0d8e MP |
52 | if (verbose >= 2) { |
53 | print_child_argv(command); | |
54 | } | |
55 | ||
56 | if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 57 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
58 | exit_cleanup(RERR_IPC); |
59 | } | |
60 | ||
b35d0d8e MP |
61 | pid = do_fork(); |
62 | if (pid == -1) { | |
d62bcc17 | 63 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
64 | exit_cleanup(RERR_IPC); |
65 | } | |
66 | ||
67 | if (pid == 0) { | |
b35d0d8e MP |
68 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
69 | close(to_child_pipe[1]) < 0 || | |
70 | close(from_child_pipe[0]) < 0 || | |
71 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 72 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
73 | exit_cleanup(RERR_IPC); |
74 | } | |
75 | if (to_child_pipe[0] != STDIN_FILENO) | |
76 | close(to_child_pipe[0]); | |
77 | if (from_child_pipe[1] != STDOUT_FILENO) | |
78 | close(from_child_pipe[1]); | |
79 | umask(orig_umask); | |
80 | set_blocking(STDIN_FILENO); | |
7d3f8ae2 | 81 | if (blocking_io > 0) |
b35d0d8e | 82 | set_blocking(STDOUT_FILENO); |
b35d0d8e | 83 | execvp(command[0], command); |
45c49b52 | 84 | rsyserr(FERROR, errno, "Failed to exec %s", command[0]); |
b35d0d8e MP |
85 | exit_cleanup(RERR_IPC); |
86 | } | |
87 | ||
88 | if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) { | |
d62bcc17 | 89 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
90 | exit_cleanup(RERR_IPC); |
91 | } | |
92 | ||
93 | *f_in = from_child_pipe[0]; | |
94 | *f_out = to_child_pipe[1]; | |
95 | ||
96 | return pid; | |
97 | } | |
98 | ||
391516da | 99 | /* This function forks a child which calls child_main(). First, |
b9f592fb WD |
100 | * however, it has to establish communication paths to and from the |
101 | * newborn child. It creates two socket pairs -- one for writing to | |
102 | * the child (from the parent) and one for reading from the child | |
103 | * (writing to the parent). Since that's four socket ends, each | |
104 | * process has to close the two ends it doesn't need. The remaining | |
105 | * two socket ends are retained for reading and writing. In the | |
106 | * child, the STDIN and STDOUT file descriptors refer to these | |
107 | * sockets. In the parent, the function arguments f_in and f_out are | |
391516da | 108 | * set to refer to these sockets. */ |
b9f592fb | 109 | pid_t local_child(int argc, char **argv, int *f_in, int *f_out, |
b44be3e9 | 110 | int (*child_main)(int, char*[])) |
b35d0d8e MP |
111 | { |
112 | pid_t pid; | |
113 | int to_child_pipe[2]; | |
114 | int from_child_pipe[2]; | |
b35d0d8e | 115 | |
ba30fb5c WD |
116 | /* The parent process is always the sender for a local rsync. */ |
117 | assert(am_sender); | |
118 | ||
b35d0d8e MP |
119 | if (fd_pair(to_child_pipe) < 0 || |
120 | fd_pair(from_child_pipe) < 0) { | |
d62bcc17 | 121 | rsyserr(FERROR, errno, "pipe"); |
b35d0d8e MP |
122 | exit_cleanup(RERR_IPC); |
123 | } | |
124 | ||
8c90957f | 125 | pid = do_fork(); |
b35d0d8e | 126 | if (pid == -1) { |
d62bcc17 | 127 | rsyserr(FERROR, errno, "fork"); |
b35d0d8e MP |
128 | exit_cleanup(RERR_IPC); |
129 | } | |
130 | ||
131 | if (pid == 0) { | |
ba30fb5c | 132 | am_sender = 0; |
e2ccd357 | 133 | am_server = 1; |
ba30fb5c WD |
134 | filesfrom_fd = -1; |
135 | chmod_modes = NULL; /* Let the sending side handle this. */ | |
7c2a9e76 | 136 | |
b35d0d8e MP |
137 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
138 | close(to_child_pipe[1]) < 0 || | |
139 | close(from_child_pipe[0]) < 0 || | |
140 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
d62bcc17 | 141 | rsyserr(FERROR, errno, "Failed to dup/close"); |
b35d0d8e MP |
142 | exit_cleanup(RERR_IPC); |
143 | } | |
3896bca4 WD |
144 | if (to_child_pipe[0] != STDIN_FILENO) |
145 | close(to_child_pipe[0]); | |
146 | if (from_child_pipe[1] != STDOUT_FILENO) | |
147 | close(from_child_pipe[1]); | |
b35d0d8e MP |
148 | child_main(argc, argv); |
149 | } | |
150 | ||
151 | if (close(from_child_pipe[1]) < 0 || | |
152 | close(to_child_pipe[0]) < 0) { | |
e2ccd357 | 153 | rsyserr(FERROR, errno, "Failed to close"); |
b35d0d8e MP |
154 | exit_cleanup(RERR_IPC); |
155 | } | |
156 | ||
157 | *f_in = from_child_pipe[0]; | |
158 | *f_out = to_child_pipe[1]; | |
e2ccd357 | 159 | |
b35d0d8e MP |
160 | return pid; |
161 | } |