protocol.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "environment.h"
   4 #include "protocol.h"
   5
   6 static enum protocol_version parse_protocol_version(const char *value)
   7 {
   8         if (!strcmp(value, "0"))
   9                 return protocol_v0;
  10         else if (!strcmp(value, "1"))
  11                 return protocol_v1;
  12         else if (!strcmp(value, "2"))
  13                 return protocol_v2;
  14         else
  15                 return protocol_unknown_version;
  16 }
  17
  18 enum protocol_version get_protocol_version_config(void)
  19 {
  20         const char *value;
  21         const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
  22         const char *git_test_v;
  23
  24         if (!git_config_get_string_tmp("protocol.version", &value)) {
  25                 enum protocol_version version = parse_protocol_version(value);
  26
  27                 if (version == protocol_unknown_version)
  28                         die("unknown value for config 'protocol.version': %s",
  29                             value);
  30
  31                 return version;
  32         }
  33
  34         git_test_v = getenv(git_test_k);
  35         if (git_test_v && *git_test_v) {
  36                 enum protocol_version env = parse_protocol_version(git_test_v);
  37
  38                 if (env == protocol_unknown_version)
  39                         die("unknown value for %s: %s", git_test_k, git_test_v);
  40                 return env;
  41         }
  42
  43         return protocol_v2;
  44 }
  45
  46 enum protocol_version determine_protocol_version_server(void)
  47 {
  48         const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
  49         enum protocol_version version = protocol_v0;
  50
  51         /*
  52          * Determine which protocol version the client has requested.  Since
  53          * multiple 'version' keys can be sent by the client, indicating that
  54          * the client is okay to speak any of them, select the greatest version
  55          * that the client has requested.  This is due to the assumption that
  56          * the most recent protocol version will be the most state-of-the-art.
  57          */
  58         if (git_protocol) {
  59                 struct string_list list = STRING_LIST_INIT_DUP;
  60                 const struct string_list_item *item;
  61                 string_list_split(&list, git_protocol, ':', -1);
  62
  63                 for_each_string_list_item(item, &list) {
  64                         const char *value;
  65                         enum protocol_version v;
  66
  67                         if (skip_prefix(item->string, "version=", &value)) {
  68                                 v = parse_protocol_version(value);
  69                                 if (v > version)
  70                                         version = v;
  71                         }
  72                 }
  73
  74                 string_list_clear(&list, 0);
  75         }
  76
  77         trace2_data_intmax("transfer", NULL, "negotiated-version", version);
  78
  79         return version;
  80 }
  81
  82 enum protocol_version determine_protocol_version_client(const char *server_response)
  83 {
  84         enum protocol_version version = protocol_v0;
  85
  86         if (skip_prefix(server_response, "version ", &server_response)) {
  87                 version = parse_protocol_version(server_response);
  88
  89                 if (version == protocol_unknown_version)
  90                         die("server is speaking an unknown protocol");
  91                 if (version == protocol_v0)
  92                         die("protocol error: server explicitly said version 0");
  93         }
  94
  95         return version;
  96 }