Commit | Line | Data |
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d633e577 JA |
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> | |
d633e577 JA |
10 | #include <netinet/in.h> |
11 | #include <arpa/inet.h> | |
12 | #include <netdb.h> | |
13 | #include <sys/stat.h> | |
14 | #include <sys/types.h> | |
15 | #include <errno.h> | |
16 | #include <limits.h> | |
17 | ||
18 | #include "splice.h" | |
19 | ||
20 | static int do_splice(int infd, int outfd, unsigned int len, char *msg) | |
21 | { | |
22 | while (len) { | |
23 | int written = splice(infd, NULL, outfd, NULL, len, 0); | |
24 | ||
25 | if (written <= 0) | |
26 | return error(msg); | |
27 | ||
28 | len -= written; | |
29 | } | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | static int usage(char *name) | |
35 | { | |
36 | fprintf(stderr, "%s: hostname:port\n", name); | |
37 | return 1; | |
38 | } | |
39 | ||
40 | int main(int argc, char *argv[]) | |
41 | { | |
42 | struct sockaddr_in addr; | |
43 | char *p, *hname; | |
44 | struct stat sb; | |
45 | int fd; | |
46 | ||
47 | if (argc < 2) | |
48 | return usage(argv[0]); | |
49 | ||
50 | if (fstat(STDIN_FILENO, &sb) < 0) | |
51 | return error("stat"); | |
52 | if (!S_ISFIFO(sb.st_mode)) { | |
53 | fprintf(stderr, "stdin must be a pipe\n"); | |
54 | return 1; | |
55 | } | |
56 | ||
57 | hname = strdup(argv[1]); | |
58 | p = strstr(hname, ":"); | |
59 | if (!p) | |
60 | return usage(argv[0]); | |
61 | ||
62 | memset(&addr, 0, sizeof(addr)); | |
63 | addr.sin_family = AF_INET; | |
64 | addr.sin_port = htons(atoi(p + 1)); | |
65 | *p = '\0'; | |
66 | ||
67 | if (inet_aton(hname, &addr.sin_addr) != 1) { | |
68 | struct hostent *hent = gethostbyname(hname); | |
69 | ||
70 | if (!hent) | |
71 | return error("gethostbyname"); | |
72 | ||
73 | memcpy(&addr.sin_addr, hent->h_addr, 4); | |
74 | } | |
75 | ||
76 | fd = socket(AF_INET, SOCK_STREAM, 0); | |
77 | if (fd < 0) | |
78 | return error("socket"); | |
79 | ||
d633e577 JA |
80 | if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) |
81 | return error("connect"); | |
82 | ||
83 | do { | |
84 | int tee_len = tee(STDIN_FILENO, STDOUT_FILENO, INT_MAX, SPLICE_F_NONBLOCK); | |
85 | ||
86 | if (tee_len < 0) { | |
87 | if (errno == EAGAIN) { | |
88 | usleep(1000); | |
89 | continue; | |
90 | } | |
91 | return error("tee"); | |
92 | } else if (!tee_len) | |
93 | break; | |
94 | ||
95 | /* | |
96 | * Send output to file, also consumes input pipe. | |
97 | */ | |
98 | if (do_splice(STDIN_FILENO, fd, tee_len, "splice-net")) | |
99 | break; | |
100 | } while (1); | |
101 | ||
102 | close(fd); | |
103 | return 0; | |
104 | } |