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373d70ef BW |
1 | #include "cache.h" |
2 | #include "config.h" | |
3 | #include "protocol.h" | |
4 | ||
5 | static enum protocol_version parse_protocol_version(const char *value) | |
6 | { | |
7 | if (!strcmp(value, "0")) | |
8 | return protocol_v0; | |
9 | else if (!strcmp(value, "1")) | |
10 | return protocol_v1; | |
8f6982b4 BW |
11 | else if (!strcmp(value, "2")) |
12 | return protocol_v2; | |
373d70ef BW |
13 | else |
14 | return protocol_unknown_version; | |
15 | } | |
16 | ||
17 | enum protocol_version get_protocol_version_config(void) | |
18 | { | |
19 | const char *value; | |
20 | if (!git_config_get_string_const("protocol.version", &value)) { | |
21 | enum protocol_version version = parse_protocol_version(value); | |
22 | ||
23 | if (version == protocol_unknown_version) | |
24 | die("unknown value for config 'protocol.version': %s", | |
25 | value); | |
26 | ||
27 | return version; | |
28 | } | |
29 | ||
30 | return protocol_v0; | |
31 | } | |
32 | ||
33 | enum protocol_version determine_protocol_version_server(void) | |
34 | { | |
35 | const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT); | |
36 | enum protocol_version version = protocol_v0; | |
37 | ||
38 | /* | |
39 | * Determine which protocol version the client has requested. Since | |
40 | * multiple 'version' keys can be sent by the client, indicating that | |
41 | * the client is okay to speak any of them, select the greatest version | |
42 | * that the client has requested. This is due to the assumption that | |
43 | * the most recent protocol version will be the most state-of-the-art. | |
44 | */ | |
45 | if (git_protocol) { | |
46 | struct string_list list = STRING_LIST_INIT_DUP; | |
47 | const struct string_list_item *item; | |
48 | string_list_split(&list, git_protocol, ':', -1); | |
49 | ||
50 | for_each_string_list_item(item, &list) { | |
51 | const char *value; | |
52 | enum protocol_version v; | |
53 | ||
54 | if (skip_prefix(item->string, "version=", &value)) { | |
55 | v = parse_protocol_version(value); | |
56 | if (v > version) | |
57 | version = v; | |
58 | } | |
59 | } | |
60 | ||
61 | string_list_clear(&list, 0); | |
62 | } | |
63 | ||
64 | return version; | |
65 | } | |
66 | ||
67 | enum protocol_version determine_protocol_version_client(const char *server_response) | |
68 | { | |
69 | enum protocol_version version = protocol_v0; | |
70 | ||
71 | if (skip_prefix(server_response, "version ", &server_response)) { | |
72 | version = parse_protocol_version(server_response); | |
73 | ||
74 | if (version == protocol_unknown_version) | |
75 | die("server is speaking an unknown protocol"); | |
76 | if (version == protocol_v0) | |
77 | die("protocol error: server explicitly said version 0"); | |
78 | } | |
79 | ||
80 | return version; | |
81 | } |