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
 110 extern int active_requests;
 111 extern int http_is_verbose;
 112 extern size_t http_post_buffer;
 113 extern struct credential http_auth;
 114
 115 extern char curl_errorstr[CURL_ERROR_SIZE];
 116
 117 static inline int missing__target(int code, int result)
 118 {
 119         return  /* file:// URL -- do we ever use one??? */
 120                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
 121                 /* http:// and https:// URL */
 122                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 123                 /* ftp:// URL */
 124                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 125                 ;
 126 }
 127
 128 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 129
 130 /* Helpers for modifying and creating URLs */
 131 extern void append_remote_object_url(struct strbuf *buf, const char *url,
 132                                      const char *hex,
 133                                      int only_two_digit_prefix);
 134 extern char *get_remote_object_url(const char *url, const char *hex,
 135                                    int only_two_digit_prefix);
 136
 137 /* Options for http_get_*() */
 138 struct http_get_options {
 139         unsigned no_cache:1,
 140                  keep_error:1;
 141
 142         /* If non-NULL, returns the content-type of the response. */
 143         struct strbuf *content_type;
 144
 145         /*
 146          * If non-NULL, and content_type above is non-NULL, returns
 147          * the charset parameter from the content-type. If none is
 148          * present, returns an empty string.
 149          */
 150         struct strbuf *charset;
 151
 152         /*
 153          * If non-NULL, returns the URL we ended up at, including any
 154          * redirects we followed.
 155          */
 156         struct strbuf *effective_url;
 157
 158         /*
 159          * If both base_url and effective_url are non-NULL, the base URL will
 160          * be munged to reflect any redirections going from the requested url
 161          * to effective_url. See the definition of update_url_from_redirect
 162          * for details.
 163          */
 164         struct strbuf *base_url;
 165 };
 166
 167 /* Return values for http_get_*() */
 168 #define HTTP_OK                 0
 169 #define HTTP_MISSING_TARGET     1
 170 #define HTTP_ERROR              2
 171 #define HTTP_START_FAILED       3
 172 #define HTTP_REAUTH     4
 173 #define HTTP_NOAUTH     5
 174
 175 /*
 176  * Requests a URL and stores the result in a strbuf.
 177  *
 178  * If the result pointer is NULL, a HTTP HEAD request is made instead of GET.
 179  */
 180 int http_get_strbuf(const char *url, struct strbuf *result, struct http_get_options *options);
 181
 182 extern int http_fetch_ref(const char *base, struct ref *ref);
 183
 184 /* Helpers for fetching packs */
 185 extern int http_get_info_packs(const char *base_url,
 186         struct packed_git **packs_head);
 187
 188 struct http_pack_request {
 189         char *url;
 190         struct packed_git *target;
 191         struct packed_git **lst;
 192         FILE *packfile;
 193         char tmpfile[PATH_MAX];
 194         struct active_request_slot *slot;
 195 };
 196
 197 extern struct http_pack_request *new_http_pack_request(
 198         struct packed_git *target, const char *base_url);
 199 extern int finish_http_pack_request(struct http_pack_request *preq);
 200 extern void release_http_pack_request(struct http_pack_request *preq);
 201
 202 /* Helpers for fetching object */
 203 struct http_object_request {
 204         char *url;
 205         char tmpfile[PATH_MAX];
 206         int localfile;
 207         CURLcode curl_result;
 208         char errorstr[CURL_ERROR_SIZE];
 209         long http_code;
 210         unsigned char sha1[20];
 211         unsigned char real_sha1[20];
 212         git_SHA_CTX c;
 213         git_zstream stream;
 214         int zret;
 215         int rename;
 216         struct active_request_slot *slot;
 217 };
 218
 219 extern struct http_object_request *new_http_object_request(
 220         const char *base_url, unsigned char *sha1);
 221 extern void process_http_object_request(struct http_object_request *freq);
 222 extern int finish_http_object_request(struct http_object_request *freq);
 223 extern void abort_http_object_request(struct http_object_request *freq);
 224 extern void release_http_object_request(struct http_object_request *freq);
 225
 226 #endif /* HTTP_H */