1 #include "builtin.h"
2 #include "transport.h"
3
4 static const char usage_msg[] =
5 "git remote-fd <remote> <url>";
6
7 /*
8 * URL syntax:
9 * 'fd::<inoutfd>[/<anything>]' Read/write socket pair
10 * <inoutfd>.
11 * 'fd::<infd>,<outfd>[/<anything>]' Read pipe <infd> and write
12 * pipe <outfd>.
13 * [foo] indicates 'foo' is optional. <anything> is any string.
14 *
15 * The data output to <outfd>/<inoutfd> should be passed unmolested to
16 * git-receive-pack/git-upload-pack/git-upload-archive and output of
17 * git-receive-pack/git-upload-pack/git-upload-archive should be passed
18 * unmolested to <infd>/<inoutfd>.
19 *
20 */
21
22 #define MAXCOMMAND 4096
23
command_loop(int input_fd,int output_fd)24 static void command_loop(int input_fd, int output_fd)
25 {
26 char buffer[MAXCOMMAND];
27
28 while (1) {
29 size_t i;
30 if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
31 if (ferror(stdin))
32 die("Input error");
33 return;
34 }
35 /* Strip end of line characters. */
36 i = strlen(buffer);
37 while (i > 0 && isspace(buffer[i - 1]))
38 buffer[--i] = 0;
39
40 if (!strcmp(buffer, "capabilities")) {
41 printf("*connect\n\n");
42 fflush(stdout);
43 } else if (!strncmp(buffer, "connect ", 8)) {
44 printf("\n");
45 fflush(stdout);
46 if (bidirectional_transfer_loop(input_fd,
47 output_fd))
48 die("Copying data between file descriptors failed");
49 return;
50 } else {
51 die("Bad command: %s", buffer);
52 }
53 }
54 }
55
cmd_remote_fd(int argc,const char ** argv,const char * prefix)56 int cmd_remote_fd(int argc, const char **argv, const char *prefix)
57 {
58 int input_fd = -1;
59 int output_fd = -1;
60 char *end;
61
62 if (argc != 3)
63 usage(usage_msg);
64
65 input_fd = (int)strtoul(argv[2], &end, 10);
66
67 if ((end == argv[2]) || (*end != ',' && *end != '/' && *end))
68 die("Bad URL syntax");
69
70 if (*end == '/' || !*end) {
71 output_fd = input_fd;
72 } else {
73 char *end2;
74 output_fd = (int)strtoul(end + 1, &end2, 10);
75
76 if ((end2 == end + 1) || (*end2 != '/' && *end2))
77 die("Bad URL syntax");
78 }
79
80 command_loop(input_fd, output_fd);
81 return 0;
82 }
83