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 /*
  14  * We detect based on the cURL version if multi-transfer is
  15  * usable in this implementation and define this symbol accordingly.
  16  * This shouldn't be set by the Makefile or by the user (e.g. via CFLAGS).
  17  */
  18 #undef USE_CURL_MULTI
  19
  20 #if LIBCURL_VERSION_NUM >= 0x071000
  21 #define USE_CURL_MULTI
  22 #define DEFAULT_MAX_REQUESTS 5
  23 #endif
  24
  25 #if LIBCURL_VERSION_NUM < 0x070704
  26 #define curl_global_cleanup() do { /* nothing */ } while (0)
  27 #endif
  28 #if LIBCURL_VERSION_NUM < 0x070800
  29 #define curl_global_init(a) do { /* nothing */ } while (0)
  30 #endif
  31
  32 #if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
  33 #define NO_CURL_EASY_DUPHANDLE
  34 #endif
  35
  36 #if LIBCURL_VERSION_NUM < 0x070a03
  37 #define CURLE_HTTP_RETURNED_ERROR CURLE_HTTP_NOT_FOUND
  38 #endif
  39
  40 #if LIBCURL_VERSION_NUM < 0x070c03
  41 #define NO_CURL_IOCTL
  42 #endif
  43
  44 /*
  45  * CURLOPT_USE_SSL was known as CURLOPT_FTP_SSL up to 7.16.4,
  46  * and the constants were known as CURLFTPSSL_*
  47 */
  48 #if !defined(CURLOPT_USE_SSL) && defined(CURLOPT_FTP_SSL)
  49 #define CURLOPT_USE_SSL CURLOPT_FTP_SSL
  50 #define CURLUSESSL_TRY CURLFTPSSL_TRY
  51 #endif
  52
  53 struct slot_results {
  54         CURLcode curl_result;
  55         long http_code;
  56         long auth_avail;
  57         long http_connectcode;
  58 };
  59
  60 struct active_request_slot {
  61         CURL *curl;
  62         int in_use;
  63         CURLcode curl_result;
  64         long http_code;
  65         int *finished;
  66         struct slot_results *results;
  67         void *callback_data;
  68         void (*callback_func)(void *data);
  69         struct active_request_slot *next;
  70 };
  71
  72 struct buffer {
  73         struct strbuf buf;
  74         size_t posn;
  75 };
  76
  77 /* Curl request read/write callbacks */
  78 extern size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  79 extern size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  80 extern size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  81 #ifndef NO_CURL_IOCTL
  82 extern curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
  83 #endif
  84
  85 /* Slot lifecycle functions */
  86 extern struct active_request_slot *get_active_slot(void);
  87 extern int start_active_slot(struct active_request_slot *slot);
  88 extern void run_active_slot(struct active_request_slot *slot);
  89 extern void finish_all_active_slots(void);
  90
  91 /*
  92  * This will run one slot to completion in a blocking manner, similar to how
  93  * curl_easy_perform would work (but we don't want to use that, because
  94  * we do not want to intermingle calls to curl_multi and curl_easy).
  95  *
  96  */
  97 int run_one_slot(struct active_request_slot *slot,
  98                  struct slot_results *results);
  99
 100 #ifdef USE_CURL_MULTI
 101 extern void fill_active_slots(void);
 102 extern void add_fill_function(void *data, int (*fill)(void *));
 103 extern void step_active_slots(void);
 104 #endif
 105
 106 extern void http_init(struct remote *remote, const char *url,
 107                       int proactive_auth);
 108 extern void http_cleanup(void);
 109 extern struct curl_slist *http_copy_default_headers(void);
 110
 111 extern long int git_curl_ipresolve;
 112 extern int active_requests;
 113 extern int http_is_verbose;
 114 extern ssize_t http_post_buffer;
 115 extern struct credential http_auth;
 116
 117 extern char curl_errorstr[CURL_ERROR_SIZE];
 118
 119 enum http_follow_config {
 120         HTTP_FOLLOW_NONE,
 121         HTTP_FOLLOW_ALWAYS,
 122         HTTP_FOLLOW_INITIAL
 123 };
 124 extern enum http_follow_config http_follow_config;
 125
 126 static inline int missing__target(int code, int result)
 127 {
 128         return  /* file:// URL -- do we ever use one??? */
 129                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
 130                 /* http:// and https:// URL */
 131                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 132                 /* ftp:// URL */
 133                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 134                 ;
 135 }
 136
 137 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 138
 139 /* Helpers for modifying and creating URLs */
 140 extern void append_remote_object_url(struct strbuf *buf, const char *url,
 141                                      const char *hex,
 142                                      int only_two_digit_prefix);
 143 extern char *get_remote_object_url(const char *url, const char *hex,
 144                                    int only_two_digit_prefix);
 145
 146 /* Options for http_get_*() */
 147 struct http_get_options {
 148         unsigned no_cache:1,
 149                  keep_error:1,
 150                  initial_request:1;
 151
 152         /* If non-NULL, returns the content-type of the response. */
 153         struct strbuf *content_type;
 154
 155         /*
 156          * If non-NULL, and content_type above is non-NULL, returns
 157          * the charset parameter from the content-type. If none is
 158          * present, returns an empty string.
 159          */
 160         struct strbuf *charset;
 161
 162         /*
 163          * If non-NULL, returns the URL we ended up at, including any
 164          * redirects we followed.
 165          */
 166         struct strbuf *effective_url;
 167
 168         /*
 169          * If both base_url and effective_url are non-NULL, the base URL will
 170          * be munged to reflect any redirections going from the requested url
 171          * to effective_url. See the definition of update_url_from_redirect
 172          * for details.
 173          */
 174         struct strbuf *base_url;
 175 };
 176
 177 /* Return values for http_get_*() */
 178 #define HTTP_OK                 0
 179 #define HTTP_MISSING_TARGET     1
 180 #define HTTP_ERROR              2
 181 #define HTTP_START_FAILED       3
 182 #define HTTP_REAUTH     4
 183 #define HTTP_NOAUTH     5
 184
 185 /*
 186  * Requests a URL and stores the result in a strbuf.
 187  *
 188  * If the result pointer is NULL, a HTTP HEAD request is made instead of GET.
 189  */
 190 int http_get_strbuf(const char *url, struct strbuf *result, struct http_get_options *options);
 191
 192 extern int http_fetch_ref(const char *base, struct ref *ref);
 193
 194 /* Helpers for fetching packs */
 195 extern int http_get_info_packs(const char *base_url,
 196         struct packed_git **packs_head);
 197
 198 struct http_pack_request {
 199         char *url;
 200         struct packed_git *target;
 201         struct packed_git **lst;
 202         FILE *packfile;
 203         char tmpfile[PATH_MAX];
 204         struct active_request_slot *slot;
 205 };
 206
 207 extern struct http_pack_request *new_http_pack_request(
 208         struct packed_git *target, const char *base_url);
 209 extern int finish_http_pack_request(struct http_pack_request *preq);
 210 extern void release_http_pack_request(struct http_pack_request *preq);
 211
 212 /* Helpers for fetching object */
 213 struct http_object_request {
 214         char *url;
 215         char tmpfile[PATH_MAX];
 216         int localfile;
 217         CURLcode curl_result;
 218         char errorstr[CURL_ERROR_SIZE];
 219         long http_code;
 220         unsigned char sha1[20];
 221         unsigned char real_sha1[20];
 222         git_SHA_CTX c;
 223         git_zstream stream;
 224         int zret;
 225         int rename;
 226         struct active_request_slot *slot;
 227 };
 228
 229 extern struct http_object_request *new_http_object_request(
 230         const char *base_url, unsigned char *sha1);
 231 extern void process_http_object_request(struct http_object_request *freq);
 232 extern int finish_http_object_request(struct http_object_request *freq);
 233 extern void abort_http_object_request(struct http_object_request *freq);
 234 extern void release_http_object_request(struct http_object_request *freq);
 235
 236 /* setup routine for curl_easy_setopt CURLOPT_DEBUGFUNCTION */
 237 void setup_curl_trace(CURL *handle);
 238 #endif /* HTTP_H */