| 1 | #include "rsync.h" |
| 2 | |
| 3 | /** |
| 4 | * Create a child connected to use on stdin/stdout. |
| 5 | * |
| 6 | * This is derived from CVS code |
| 7 | * |
| 8 | * Note that in the child STDIN is set to blocking and STDOUT |
| 9 | * is set to non-blocking. This is necessary as rsh relies on stdin being blocking |
| 10 | * and ssh relies on stdout being non-blocking |
| 11 | * |
| 12 | * If blocking_io is set then use blocking io on both fds. That can be |
| 13 | * used to cope with badly broken rsh implementations like the one on |
| 14 | * Solaris. |
| 15 | **/ |
| 16 | pid_t piped_child(char **command, int *f_in, int *f_out) |
| 17 | { |
| 18 | pid_t pid; |
| 19 | int to_child_pipe[2]; |
| 20 | int from_child_pipe[2]; |
| 21 | extern int blocking_io; |
| 22 | |
| 23 | if (verbose >= 2) { |
| 24 | print_child_argv(command); |
| 25 | } |
| 26 | |
| 27 | if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) { |
| 28 | rprintf(FERROR, "pipe: %s\n", strerror(errno)); |
| 29 | exit_cleanup(RERR_IPC); |
| 30 | } |
| 31 | |
| 32 | |
| 33 | pid = do_fork(); |
| 34 | if (pid == -1) { |
| 35 | rprintf(FERROR, "fork: %s\n", strerror(errno)); |
| 36 | exit_cleanup(RERR_IPC); |
| 37 | } |
| 38 | |
| 39 | if (pid == 0) { |
| 40 | extern int orig_umask; |
| 41 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 42 | close(to_child_pipe[1]) < 0 || |
| 43 | close(from_child_pipe[0]) < 0 || |
| 44 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 45 | rprintf(FERROR, "Failed to dup/close : %s\n", |
| 46 | strerror(errno)); |
| 47 | exit_cleanup(RERR_IPC); |
| 48 | } |
| 49 | if (to_child_pipe[0] != STDIN_FILENO) |
| 50 | close(to_child_pipe[0]); |
| 51 | if (from_child_pipe[1] != STDOUT_FILENO) |
| 52 | close(from_child_pipe[1]); |
| 53 | umask(orig_umask); |
| 54 | set_blocking(STDIN_FILENO); |
| 55 | if (blocking_io) { |
| 56 | set_blocking(STDOUT_FILENO); |
| 57 | } |
| 58 | execvp(command[0], command); |
| 59 | rprintf(FERROR, "Failed to exec %s : %s\n", |
| 60 | command[0], strerror(errno)); |
| 61 | exit_cleanup(RERR_IPC); |
| 62 | } |
| 63 | |
| 64 | if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) { |
| 65 | rprintf(FERROR, "Failed to close : %s\n", strerror(errno)); |
| 66 | exit_cleanup(RERR_IPC); |
| 67 | } |
| 68 | |
| 69 | *f_in = from_child_pipe[0]; |
| 70 | *f_out = to_child_pipe[1]; |
| 71 | |
| 72 | return pid; |
| 73 | } |
| 74 | |
| 75 | pid_t local_child(int argc, char **argv,int *f_in,int *f_out, |
| 76 | int (*child_main)(int, char **)) |
| 77 | { |
| 78 | pid_t pid; |
| 79 | int to_child_pipe[2]; |
| 80 | int from_child_pipe[2]; |
| 81 | extern int read_batch; /* dw */ |
| 82 | |
| 83 | if (fd_pair(to_child_pipe) < 0 || |
| 84 | fd_pair(from_child_pipe) < 0) { |
| 85 | rprintf(FERROR,"pipe: %s\n",strerror(errno)); |
| 86 | exit_cleanup(RERR_IPC); |
| 87 | } |
| 88 | |
| 89 | |
| 90 | pid = do_fork(); |
| 91 | if (pid == -1) { |
| 92 | rprintf(FERROR,"fork: %s\n",strerror(errno)); |
| 93 | exit_cleanup(RERR_IPC); |
| 94 | } |
| 95 | |
| 96 | if (pid == 0) { |
| 97 | extern int am_sender; |
| 98 | extern int am_server; |
| 99 | |
| 100 | am_sender = read_batch ? 0 : !am_sender; |
| 101 | am_server = 1; |
| 102 | |
| 103 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 104 | close(to_child_pipe[1]) < 0 || |
| 105 | close(from_child_pipe[0]) < 0 || |
| 106 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 107 | rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
| 108 | exit_cleanup(RERR_IPC); |
| 109 | } |
| 110 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
| 111 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); |
| 112 | child_main(argc, argv); |
| 113 | } |
| 114 | |
| 115 | if (close(from_child_pipe[1]) < 0 || |
| 116 | close(to_child_pipe[0]) < 0) { |
| 117 | rprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
| 118 | exit_cleanup(RERR_IPC); |
| 119 | } |
| 120 | |
| 121 | *f_in = from_child_pipe[0]; |
| 122 | *f_out = to_child_pipe[1]; |
| 123 | |
| 124 | return pid; |
| 125 | } |
| 126 | |
| 127 | |