1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
#include "cache.h"
static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
static const char *exec = "git-receive-pack";
static int send_pack(int in, int out)
{
for (;;) {
static char buffer[1000];
int ret = read(in, buffer, sizeof(buffer));
if (ret > 0) {
write(1, buffer, ret);
continue;
}
break;
}
close(out);
return 0;
}
/*
* First, make it shell-safe. We do this by just disallowing any
* special characters. Somebody who cares can do escaping and let
* through the rest. But since we're doing to feed this to ssh as
* a command line, we're going to be pretty damn anal for now.
*/
static char *shell_safe(char *url)
{
char *n = url;
unsigned char c;
static const char flags[256] = {
['0'...'9'] = 1,
['a'...'z'] = 1,
['A'...'Z'] = 1,
['.'] = 1, ['/'] = 1,
['-'] = 1, ['+'] = 1,
[':'] = 1
};
while ((c = *n++) != 0) {
if (flags[c] != 1)
die("I don't like '%c'. Sue me.", c);
}
return url;
}
/*
* Yeah, yeah, fixme. Need to pass in the heads etc.
*/
static int setup_connection(int fd[2], char *url, char **heads)
{
char command[1024];
const char *host, *path;
char *colon;
int pipefd[2][2];
url = shell_safe(url);
host = NULL;
path = url;
colon = strchr(url, ':');
if (colon) {
*colon = 0;
host = url;
path = colon+1;
}
snprintf(command, sizeof(command), "%s %s", exec, path);
if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
die("unable to create pipe pair for communication");
if (!fork()) {
dup2(pipefd[1][0], 0);
dup2(pipefd[0][1], 1);
close(pipefd[0][0]);
close(pipefd[0][1]);
close(pipefd[1][0]);
close(pipefd[1][1]);
if (host)
execlp("ssh", "ssh", host, command, NULL);
else
execlp(host, command, NULL);
die("exec failed");
}
fd[0] = pipefd[0][0];
fd[1] = pipefd[1][1];
close(pipefd[0][1]);
close(pipefd[1][0]);
return 0;
}
int main(int argc, char **argv)
{
int i, nr_heads = 0;
char *dest = NULL;
char **heads = NULL;
int fd[2];
argv++;
for (i = 1; i < argc; i++) {
char *arg = *argv++;
if (*arg == '-') {
if (!strncmp(arg, "--exec=", 7)) {
exec = arg + 7;
continue;
}
usage(send_pack_usage);
}
dest = arg;
heads = argv;
nr_heads = argc - i -1;
break;
}
if (!dest)
usage(send_pack_usage);
if (setup_connection(fd, dest, heads))
return 1;
return send_pack(fd[0], fd[1]);
}
|
