| 1 | /* |
| 2 | * A tee implementation using sys_tee. Sends out the data received over |
| 3 | * stdin to the given host:port and over stdout. |
| 4 | */ |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <unistd.h> |
| 8 | #include <string.h> |
| 9 | #include <fcntl.h> |
| 10 | #include <netinet/in.h> |
| 11 | #include <arpa/inet.h> |
| 12 | #include <netdb.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <errno.h> |
| 15 | #include <limits.h> |
| 16 | |
| 17 | #include "splice.h" |
| 18 | |
| 19 | static int do_splice(int infd, int outfd, unsigned int len, char *msg) |
| 20 | { |
| 21 | while (len) { |
| 22 | int written = splice(infd, NULL, outfd, NULL, len, 0); |
| 23 | |
| 24 | if (written <= 0) |
| 25 | return error(msg); |
| 26 | |
| 27 | len -= written; |
| 28 | } |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int usage(char *name) |
| 34 | { |
| 35 | fprintf(stderr, "... | %s: hostname:port\n", name); |
| 36 | return 1; |
| 37 | } |
| 38 | |
| 39 | int main(int argc, char *argv[]) |
| 40 | { |
| 41 | struct sockaddr_in addr; |
| 42 | char *p, *hname; |
| 43 | int fd; |
| 44 | |
| 45 | if (argc < 2) |
| 46 | return usage(argv[0]); |
| 47 | |
| 48 | if (check_input_pipe()) |
| 49 | return usage(argv[0]); |
| 50 | |
| 51 | hname = strdup(argv[1]); |
| 52 | p = strstr(hname, ":"); |
| 53 | if (!p) |
| 54 | return usage(argv[0]); |
| 55 | |
| 56 | memset(&addr, 0, sizeof(addr)); |
| 57 | addr.sin_family = AF_INET; |
| 58 | addr.sin_port = htons(atoi(p + 1)); |
| 59 | *p = '\0'; |
| 60 | |
| 61 | if (inet_aton(hname, &addr.sin_addr) != 1) { |
| 62 | struct hostent *hent = gethostbyname(hname); |
| 63 | |
| 64 | if (!hent) |
| 65 | return error("gethostbyname"); |
| 66 | |
| 67 | memcpy(&addr.sin_addr, hent->h_addr, 4); |
| 68 | } |
| 69 | |
| 70 | fd = socket(AF_INET, SOCK_STREAM, 0); |
| 71 | if (fd < 0) |
| 72 | return error("socket"); |
| 73 | |
| 74 | if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) |
| 75 | return error("connect"); |
| 76 | |
| 77 | do { |
| 78 | int tee_len = tee(STDIN_FILENO, STDOUT_FILENO, INT_MAX, 0); |
| 79 | |
| 80 | if (tee_len < 0) { |
| 81 | if (errno == EAGAIN) { |
| 82 | usleep(1000); |
| 83 | continue; |
| 84 | } |
| 85 | return error("tee"); |
| 86 | } else if (!tee_len) |
| 87 | break; |
| 88 | |
| 89 | /* |
| 90 | * Send output to file, also consumes input pipe. |
| 91 | */ |
| 92 | if (do_splice(STDIN_FILENO, fd, tee_len, "splice-net")) |
| 93 | break; |
| 94 | } while (1); |
| 95 | |
| 96 | close(fd); |
| 97 | return 0; |
| 98 | } |