summaryrefslogtreecommitdiff
path: root/send-pack.c
blob: af57d402862c4d0572612b3e53e304978c35b352 (plain)
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]);
}