http.h

   1 #ifndef HTTP_H
   2 #define HTTP_H
   3
   4 #include "cache.h"
   5
   6 #include <curl/curl.h>
   7 #include <curl/easy.h>
   8
   9 #include "strbuf.h"
  10 #include "remote.h"
  11 #include "url.h"
  12
  13 #define DEFAULT_MAX_REQUESTS 5
  14
  15 struct slot_results {
  16         CURLcode curl_result;
  17         long http_code;
  18         long auth_avail;
  19         long http_connectcode;
  20 };
  21
  22 struct active_request_slot {
  23         CURL *curl;
  24         int in_use;
  25         CURLcode curl_result;
  26         long http_code;
  27         int *finished;
  28         struct slot_results *results;
  29         void *callback_data;
  30         void (*callback_func)(void *data);
  31         struct active_request_slot *next;
  32 };
  33
  34 struct buffer {
  35         struct strbuf buf;
  36         size_t posn;
  37 };
  38
  39 /* Curl request read/write callbacks */
  40 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  41 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  42 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  43 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
  44
  45 /* Slot lifecycle functions */
  46 struct active_request_slot *get_active_slot(void);
  47 int start_active_slot(struct active_request_slot *slot);
  48 void run_active_slot(struct active_request_slot *slot);
  49 void finish_all_active_slots(void);
  50
  51 /*
  52  * This will run one slot to completion in a blocking manner, similar to how
  53  * curl_easy_perform would work (but we don't want to use that, because
  54  * we do not want to intermingle calls to curl_multi and curl_easy).
  55  *
  56  */
  57 int run_one_slot(struct active_request_slot *slot,
  58                  struct slot_results *results);
  59
  60 void fill_active_slots(void);
  61 void add_fill_function(void *data, int (*fill)(void *));
  62 void step_active_slots(void);
  63
  64 void http_init(struct remote *remote, const char *url,
  65                int proactive_auth);
  66 void http_cleanup(void);
  67 struct curl_slist *http_copy_default_headers(void);
  68
  69 extern long int git_curl_ipresolve;
  70 extern int active_requests;
  71 extern int http_is_verbose;
  72 extern ssize_t http_post_buffer;
  73 extern struct credential http_auth;
  74
  75 extern char curl_errorstr[CURL_ERROR_SIZE];
  76
  77 enum http_follow_config {
  78         HTTP_FOLLOW_NONE,
  79         HTTP_FOLLOW_ALWAYS,
  80         HTTP_FOLLOW_INITIAL
  81 };
  82 extern enum http_follow_config http_follow_config;
  83
  84 static inline int missing__target(int code, int result)
  85 {
  86         return  /* file:// URL -- do we ever use one??? */
  87                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
  88                 /* http:// and https:// URL */
  89                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
  90                 /* ftp:// URL */
  91                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
  92                 ;
  93 }
  94
  95 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
  96
  97 /*
  98  * Normalize curl results to handle CURL_FAILONERROR (or lack thereof). Failing
  99  * http codes have their "result" converted to CURLE_HTTP_RETURNED_ERROR, and
 100  * an appropriate string placed in the errorstr buffer (pass curl_errorstr if
 101  * you don't have a custom buffer).
 102  */
 103 void normalize_curl_result(CURLcode *result, long http_code, char *errorstr,
 104                            size_t errorlen);
 105
 106 /* Helpers for modifying and creating URLs */
 107 void append_remote_object_url(struct strbuf *buf, const char *url,
 108                               const char *hex,
 109                               int only_two_digit_prefix);
 110 char *get_remote_object_url(const char *url, const char *hex,
 111                             int only_two_digit_prefix);
 112
 113 /* Options for http_get_*() */
 114 struct http_get_options {
 115         unsigned no_cache:1,
 116                  initial_request:1;
 117
 118         /* If non-NULL, returns the content-type of the response. */
 119         struct strbuf *content_type;
 120
 121         /*
 122          * If non-NULL, and content_type above is non-NULL, returns
 123          * the charset parameter from the content-type. If none is
 124          * present, returns an empty string.
 125          */
 126         struct strbuf *charset;
 127
 128         /*
 129          * If non-NULL, returns the URL we ended up at, including any
 130          * redirects we followed.
 131          */
 132         struct strbuf *effective_url;
 133
 134         /*
 135          * If both base_url and effective_url are non-NULL, the base URL will
 136          * be munged to reflect any redirections going from the requested url
 137          * to effective_url. See the definition of update_url_from_redirect
 138          * for details.
 139          */
 140         struct strbuf *base_url;
 141
 142         /*
 143          * If not NULL, contains additional HTTP headers to be sent with the
 144          * request. The strings in the list must not be freed until after the
 145          * request has completed.
 146          */
 147         struct string_list *extra_headers;
 148 };
 149
 150 /* Return values for http_get_*() */
 151 #define HTTP_OK                 0
 152 #define HTTP_MISSING_TARGET     1
 153 #define HTTP_ERROR              2
 154 #define HTTP_START_FAILED       3
 155 #define HTTP_REAUTH     4
 156 #define HTTP_NOAUTH     5
 157
 158 /*
 159  * Requests a URL and stores the result in a strbuf.
 160  *
 161  * If the result pointer is NULL, a HTTP HEAD request is made instead of GET.
 162  */
 163 int http_get_strbuf(const char *url, struct strbuf *result, struct http_get_options *options);
 164
 165 int http_fetch_ref(const char *base, struct ref *ref);
 166
 167 /* Helpers for fetching packs */
 168 int http_get_info_packs(const char *base_url,
 169                         struct packed_git **packs_head);
 170
 171 struct http_pack_request {
 172         char *url;
 173
 174         /*
 175          * index-pack command to run. Must be terminated by NULL.
 176          *
 177          * If NULL, defaults to {"index-pack", "--stdin", NULL}.
 178          */
 179         const char **index_pack_args;
 180         unsigned preserve_index_pack_stdout : 1;
 181
 182         FILE *packfile;
 183         struct strbuf tmpfile;
 184         struct active_request_slot *slot;
 185 };
 186
 187 struct http_pack_request *new_http_pack_request(
 188         const unsigned char *packed_git_hash, const char *base_url);
 189 struct http_pack_request *new_direct_http_pack_request(
 190         const unsigned char *packed_git_hash, char *url);
 191 int finish_http_pack_request(struct http_pack_request *preq);
 192 void release_http_pack_request(struct http_pack_request *preq);
 193
 194 /*
 195  * Remove p from the given list, and invoke install_packed_git() on it.
 196  *
 197  * This is a convenience function for users that have obtained a list of packs
 198  * from http_get_info_packs() and have chosen a specific pack to fetch.
 199  */
 200 void http_install_packfile(struct packed_git *p,
 201                            struct packed_git **list_to_remove_from);
 202
 203 /* Helpers for fetching object */
 204 struct http_object_request {
 205         char *url;
 206         struct strbuf tmpfile;
 207         int localfile;
 208         CURLcode curl_result;
 209         char errorstr[CURL_ERROR_SIZE];
 210         long http_code;
 211         struct object_id oid;
 212         struct object_id real_oid;
 213         git_hash_ctx c;
 214         git_zstream stream;
 215         int zret;
 216         int rename;
 217         struct active_request_slot *slot;
 218 };
 219
 220 struct http_object_request *new_http_object_request(
 221         const char *base_url, const struct object_id *oid);
 222 void process_http_object_request(struct http_object_request *freq);
 223 int finish_http_object_request(struct http_object_request *freq);
 224 void abort_http_object_request(struct http_object_request *freq);
 225 void release_http_object_request(struct http_object_request *freq);
 226
 227 /*
 228  * Instead of using environment variables to determine if curl tracing happens,
 229  * behave as if GIT_TRACE_CURL=1 and GIT_TRACE_CURL_NO_DATA=1 is set. Call this
 230  * before calling setup_curl_trace().
 231  */
 232 void http_trace_curl_no_data(void);
 233
 234 /* setup routine for curl_easy_setopt CURLOPT_DEBUGFUNCTION */
 235 void setup_curl_trace(CURL *handle);
 236 #endif /* HTTP_H */