| 1 | /* |
| 2 | * Splice from network to stdout |
| 3 | */ |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <unistd.h> |
| 7 | #include <netdb.h> |
| 8 | #include <unistd.h> |
| 9 | #include <fcntl.h> |
| 10 | #include <signal.h> |
| 11 | #include <netinet/in.h> |
| 12 | #include <arpa/inet.h> |
| 13 | #include <string.h> |
| 14 | #include <sys/time.h> |
| 15 | #include <errno.h> |
| 16 | #include <sys/poll.h> |
| 17 | |
| 18 | #include "splice.h" |
| 19 | |
| 20 | static unsigned int splice_size = SPLICE_SIZE; |
| 21 | static unsigned int splice_flags; |
| 22 | static int wait_for_poll; |
| 23 | |
| 24 | static int usage(char *name) |
| 25 | { |
| 26 | fprintf(stderr, "%s: [-s splice size] [-w wait for poll] [-n non-blocking] port\n", name); |
| 27 | return 1; |
| 28 | } |
| 29 | |
| 30 | static int splice_from_net(int fd) |
| 31 | { |
| 32 | while (1) { |
| 33 | int ret; |
| 34 | |
| 35 | if (wait_for_poll) { |
| 36 | struct pollfd pfd = { |
| 37 | .fd = fd, |
| 38 | .events = POLLIN, |
| 39 | }; |
| 40 | |
| 41 | ret = poll(&pfd, 1, -1); |
| 42 | if (ret < 0) |
| 43 | return error("poll"); |
| 44 | else if (!ret) |
| 45 | continue; |
| 46 | |
| 47 | if (!(pfd.revents & POLLIN)) |
| 48 | continue; |
| 49 | } |
| 50 | |
| 51 | ret = ssplice(fd, NULL, STDOUT_FILENO, NULL, splice_size, 0); |
| 52 | |
| 53 | if (ret < 0) |
| 54 | return error("splice"); |
| 55 | else if (!ret) |
| 56 | break; |
| 57 | } |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static int get_connect(int fd, struct sockaddr_in *addr) |
| 63 | { |
| 64 | socklen_t socklen = sizeof(*addr); |
| 65 | int ret, connfd; |
| 66 | |
| 67 | do { |
| 68 | struct pollfd pfd = { |
| 69 | .fd = fd, |
| 70 | .events = POLLIN, |
| 71 | }; |
| 72 | |
| 73 | ret = poll(&pfd, 1, -1); |
| 74 | if (ret < 0) |
| 75 | return error("poll"); |
| 76 | else if (!ret) |
| 77 | continue; |
| 78 | |
| 79 | connfd = accept(fd, (struct sockaddr *) addr, &socklen); |
| 80 | if (connfd < 0) |
| 81 | return error("accept"); |
| 82 | break; |
| 83 | } while (1); |
| 84 | |
| 85 | return connfd; |
| 86 | } |
| 87 | |
| 88 | static int parse_options(int argc, char *argv[]) |
| 89 | { |
| 90 | int c, index = 1; |
| 91 | |
| 92 | while ((c = getopt(argc, argv, "s:w:n")) != -1) { |
| 93 | switch (c) { |
| 94 | case 's': |
| 95 | splice_size = atoi(optarg); |
| 96 | index++; |
| 97 | break; |
| 98 | case 'w': |
| 99 | wait_for_poll = atoi(optarg); |
| 100 | index++; |
| 101 | break; |
| 102 | case 'n': |
| 103 | splice_flags |= SPLICE_F_NONBLOCK; |
| 104 | index++; |
| 105 | break; |
| 106 | default: |
| 107 | return -1; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return index; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | int main(int argc, char *argv[]) |
| 116 | { |
| 117 | struct sockaddr_in addr; |
| 118 | unsigned short port; |
| 119 | int connfd, opt, fd, index; |
| 120 | |
| 121 | if (argc < 2) |
| 122 | return usage(argv[0]); |
| 123 | |
| 124 | if (check_output_pipe()) |
| 125 | return usage(argv[0]); |
| 126 | |
| 127 | index = parse_options(argc, argv); |
| 128 | if (index == -1 || index + 1 > argc) |
| 129 | return usage(argv[0]); |
| 130 | |
| 131 | port = atoi(argv[index]); |
| 132 | |
| 133 | fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 134 | if (fd < 0) |
| 135 | return error("socket"); |
| 136 | |
| 137 | opt = 1; |
| 138 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) |
| 139 | return error("setsockopt"); |
| 140 | |
| 141 | memset(&addr, 0, sizeof(addr)); |
| 142 | addr.sin_family = AF_INET; |
| 143 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
| 144 | addr.sin_port = htons(port); |
| 145 | |
| 146 | if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) |
| 147 | return error("bind"); |
| 148 | if (listen(fd, 1) < 0) |
| 149 | return error("listen"); |
| 150 | |
| 151 | connfd = get_connect(fd, &addr); |
| 152 | if (connfd < 0) |
| 153 | return connfd; |
| 154 | |
| 155 | return splice_from_net(connfd); |
| 156 | } |