| 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 | |
| 22 | #include "rsync.h" |
| 23 | |
| 24 | /** |
| 25 | * Create a child connected to use on stdin/stdout. |
| 26 | * |
| 27 | * This is derived from CVS code |
| 28 | * |
| 29 | * Note that in the child STDIN is set to blocking and STDOUT |
| 30 | * is set to non-blocking. This is necessary as rsh relies on stdin being blocking |
| 31 | * and ssh relies on stdout being non-blocking |
| 32 | * |
| 33 | * If blocking_io is set then use blocking io on both fds. That can be |
| 34 | * used to cope with badly broken rsh implementations like the one on |
| 35 | * Solaris. |
| 36 | **/ |
| 37 | pid_t piped_child(char **command, int *f_in, int *f_out) |
| 38 | { |
| 39 | pid_t pid; |
| 40 | int to_child_pipe[2]; |
| 41 | int from_child_pipe[2]; |
| 42 | extern int blocking_io; |
| 43 | |
| 44 | if (verbose >= 2) { |
| 45 | print_child_argv(command); |
| 46 | } |
| 47 | |
| 48 | if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) { |
| 49 | rprintf(FERROR, "pipe: %s\n", strerror(errno)); |
| 50 | exit_cleanup(RERR_IPC); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | pid = do_fork(); |
| 55 | if (pid == -1) { |
| 56 | rprintf(FERROR, "fork: %s\n", strerror(errno)); |
| 57 | exit_cleanup(RERR_IPC); |
| 58 | } |
| 59 | |
| 60 | if (pid == 0) { |
| 61 | extern int orig_umask; |
| 62 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 63 | close(to_child_pipe[1]) < 0 || |
| 64 | close(from_child_pipe[0]) < 0 || |
| 65 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 66 | rprintf(FERROR, "Failed to dup/close : %s\n", |
| 67 | strerror(errno)); |
| 68 | exit_cleanup(RERR_IPC); |
| 69 | } |
| 70 | if (to_child_pipe[0] != STDIN_FILENO) |
| 71 | close(to_child_pipe[0]); |
| 72 | if (from_child_pipe[1] != STDOUT_FILENO) |
| 73 | close(from_child_pipe[1]); |
| 74 | umask(orig_umask); |
| 75 | set_blocking(STDIN_FILENO); |
| 76 | if (blocking_io) { |
| 77 | set_blocking(STDOUT_FILENO); |
| 78 | } |
| 79 | execvp(command[0], command); |
| 80 | rprintf(FERROR, "Failed to exec %s : %s\n", |
| 81 | command[0], strerror(errno)); |
| 82 | exit_cleanup(RERR_IPC); |
| 83 | } |
| 84 | |
| 85 | if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) { |
| 86 | rprintf(FERROR, "Failed to close : %s\n", strerror(errno)); |
| 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 | |
| 96 | pid_t local_child(int argc, char **argv,int *f_in,int *f_out, |
| 97 | int (*child_main)(int, char*[])) |
| 98 | { |
| 99 | pid_t pid; |
| 100 | int to_child_pipe[2]; |
| 101 | int from_child_pipe[2]; |
| 102 | extern int read_batch; |
| 103 | extern int am_sender; |
| 104 | extern int am_server; |
| 105 | extern int filesfrom_fd; |
| 106 | |
| 107 | if (fd_pair(to_child_pipe) < 0 || |
| 108 | fd_pair(from_child_pipe) < 0) { |
| 109 | rprintf(FERROR,"pipe: %s\n",strerror(errno)); |
| 110 | exit_cleanup(RERR_IPC); |
| 111 | } |
| 112 | |
| 113 | |
| 114 | pid = do_fork(); |
| 115 | if (pid == -1) { |
| 116 | rprintf(FERROR,"fork: %s\n",strerror(errno)); |
| 117 | exit_cleanup(RERR_IPC); |
| 118 | } |
| 119 | |
| 120 | if (pid == 0) { |
| 121 | am_sender = read_batch ? 0 : !am_sender; |
| 122 | am_server = 1; |
| 123 | |
| 124 | if (!am_sender) |
| 125 | filesfrom_fd = -1; |
| 126 | |
| 127 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 128 | close(to_child_pipe[1]) < 0 || |
| 129 | close(from_child_pipe[0]) < 0 || |
| 130 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 131 | rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
| 132 | exit_cleanup(RERR_IPC); |
| 133 | } |
| 134 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
| 135 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); |
| 136 | child_main(argc, argv); |
| 137 | } |
| 138 | |
| 139 | if (!am_sender) |
| 140 | filesfrom_fd = -1; |
| 141 | |
| 142 | if (close(from_child_pipe[1]) < 0 || |
| 143 | close(to_child_pipe[0]) < 0) { |
| 144 | rprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
| 145 | exit_cleanup(RERR_IPC); |
| 146 | } |
| 147 | |
| 148 | *f_in = from_child_pipe[0]; |
| 149 | *f_out = to_child_pipe[1]; |
| 150 | |
| 151 | return pid; |
| 152 | } |