[d564c3d] | 1 | #include <signal.h> |
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| 2 | #include <unistd.h> |
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| 3 | #include <sys/select.h> |
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| 4 | #include <sys/types.h> |
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| 5 | #include <sys/wait.h> |
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| 6 | #include <poll.h> |
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| 7 | #include <fcntl.h> |
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| 8 | #include <string.h> |
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| 9 | |
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| 10 | #include <glib.h> |
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| 11 | |
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[34132f7] | 12 | /* Even in case of error, send_receive is responsible for closing wfd |
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| 13 | * (to EOF the child) and rfd (for consistency). */ |
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| 14 | static int send_receive(int rfd, int wfd, const char *out, char **in) |
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[d564c3d] | 15 | { |
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| 16 | GString *str = g_string_new(""); |
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| 17 | char buf[1024]; |
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| 18 | nfds_t nfds; |
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| 19 | int err = 0; |
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| 20 | struct pollfd fds[2]; |
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| 21 | |
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| 22 | fcntl(rfd, F_SETFL, O_NONBLOCK | fcntl(rfd, F_GETFL)); |
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| 23 | fcntl(wfd, F_SETFL, O_NONBLOCK | fcntl(wfd, F_GETFL)); |
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| 24 | |
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| 25 | fds[0].fd = rfd; |
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| 26 | fds[0].events = POLLIN; |
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| 27 | fds[1].fd = wfd; |
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| 28 | fds[1].events = POLLOUT; |
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| 29 | |
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[4a80a16] | 30 | if(!out || !*out) { |
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| 31 | /* Nothing to write. Close our end so the child doesn't hang waiting. */ |
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[34132f7] | 32 | close(wfd); wfd = -1; |
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[4a80a16] | 33 | out = NULL; |
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| 34 | } |
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| 35 | |
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[d564c3d] | 36 | while(1) { |
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| 37 | if(out && *out) { |
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| 38 | nfds = 2; |
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| 39 | } else { |
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| 40 | nfds = 1; |
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| 41 | } |
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| 42 | err = poll(fds, nfds, -1); |
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| 43 | if(err < 0) { |
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| 44 | break; |
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| 45 | } |
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| 46 | if(out && *out) { |
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| 47 | if(fds[1].revents & POLLOUT) { |
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| 48 | err = write(wfd, out, strlen(out)); |
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| 49 | if(err > 0) { |
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| 50 | out += err; |
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| 51 | } |
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| 52 | if(err < 0) { |
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| 53 | out = NULL; |
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| 54 | } |
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| 55 | } |
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| 56 | if(!out || !*out || fds[1].revents & (POLLERR | POLLHUP)) { |
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[34132f7] | 57 | close(wfd); wfd = -1; |
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[d564c3d] | 58 | out = NULL; |
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| 59 | } |
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| 60 | } |
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| 61 | if(fds[0].revents & POLLIN) { |
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| 62 | err = read(rfd, buf, sizeof(buf)); |
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| 63 | if(err <= 0) { |
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| 64 | break; |
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| 65 | } |
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| 66 | g_string_append_len(str, buf, err); |
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| 67 | } else if(fds[0].revents & (POLLHUP | POLLERR)) { |
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| 68 | err = 0; |
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| 69 | break; |
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| 70 | } |
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| 71 | } |
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| 72 | |
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[34132f7] | 73 | if (wfd >= 0) close(wfd); |
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| 74 | close(rfd); |
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[d564c3d] | 75 | *in = g_string_free(str, err < 0); |
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| 76 | return err; |
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| 77 | } |
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| 78 | |
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[34132f7] | 79 | int call_filter(const char *const *argv, const char *in, char **out, int *status) |
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[d564c3d] | 80 | { |
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[34132f7] | 81 | int err; |
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| 82 | GPid child_pid; |
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| 83 | int child_stdin, child_stdout; |
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[d564c3d] | 84 | |
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[34132f7] | 85 | if (!g_spawn_async_with_pipes(NULL, (char**)argv, NULL, |
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| 86 | G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD, |
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| 87 | NULL, NULL, |
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| 88 | &child_pid, &child_stdin, &child_stdout, NULL, |
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| 89 | NULL)) { |
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| 90 | return 1; |
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[d564c3d] | 91 | } |
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| 92 | |
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[34132f7] | 93 | err = send_receive(child_stdout, child_stdin, in, out); |
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| 94 | if (err == 0) { |
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| 95 | waitpid(child_pid, status, 0); |
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[d564c3d] | 96 | } |
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| 97 | return err; |
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| 98 | } |
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