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
29 #if LIBCURL_VERSION_NUM < 0x070800
30 #define curl_global_init(a) do { /* nothing */ } while (0)
31 #elif LIBCURL_VERSION_NUM >= 0x070c00
32 #define curl_global_init(a) curl_global_init_mem(a, xmalloc, free, \
33 xrealloc, xstrdup, xcalloc)
34 #endif
35
36 #if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
37 #define NO_CURL_EASY_DUPHANDLE
38 #endif
39
40 #if LIBCURL_VERSION_NUM < 0x070a03
41 #define CURLE_HTTP_RETURNED_ERROR CURLE_HTTP_NOT_FOUND
42 #endif
43
44 #if LIBCURL_VERSION_NUM < 0x070c03
45 #define NO_CURL_IOCTL
46 #endif
47
48 /*
49 * CURLOPT_USE_SSL was known as CURLOPT_FTP_SSL up to 7.16.4,
50 * and the constants were known as CURLFTPSSL_*
51 */
52 #if !defined(CURLOPT_USE_SSL) && defined(CURLOPT_FTP_SSL)
53 #define CURLOPT_USE_SSL CURLOPT_FTP_SSL
54 #define CURLUSESSL_TRY CURLFTPSSL_TRY
55 #endif
56
57 struct slot_results {
58 CURLcode curl_result;
59 long http_code;
60 long auth_avail;
61 long http_connectcode;
62 };
63
64 struct active_request_slot {
65 CURL *curl;
66 int in_use;
67 CURLcode curl_result;
68 long http_code;
69 int *finished;
70 struct slot_results *results;
71 void *callback_data;
72 void (*callback_func)(void *data);
73 struct active_request_slot *next;
74 };
75
76 struct buffer {
77 struct strbuf buf;
78 size_t posn;
79 };
80
81 /* Curl request read/write callbacks */
82 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
83 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
84 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
85 #ifndef NO_CURL_IOCTL
86 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
87 #endif
88
89 /* Slot lifecycle functions */
90 struct active_request_slot *get_active_slot(void);
91 int start_active_slot(struct active_request_slot *slot);
92 void run_active_slot(struct active_request_slot *slot);
93 void finish_all_active_slots(void);
94
95 /*
96 * This will run one slot to completion in a blocking manner, similar to how
97 * curl_easy_perform would work (but we don't want to use that, because
98 * we do not want to intermingle calls to curl_multi and curl_easy).
99 *
100 */
101 int run_one_slot(struct active_request_slot *slot,
102 struct slot_results *results);
103
104 #ifdef USE_CURL_MULTI
105 void fill_active_slots(void);
106 void add_fill_function(void *data, int (*fill)(void *));
107 void step_active_slots(void);
108 #endif
109
110 void http_init(struct remote *remote, const char *url,
111 int proactive_auth);
112 void http_cleanup(void);
113 struct curl_slist *http_copy_default_headers(void);
114
115 extern long int git_curl_ipresolve;
116 extern int active_requests;
117 extern int http_is_verbose;
118 extern ssize_t http_post_buffer;
119 extern struct credential http_auth;
120
121 extern char curl_errorstr[CURL_ERROR_SIZE];
122
123 enum http_follow_config {
124 HTTP_FOLLOW_NONE,
125 HTTP_FOLLOW_ALWAYS,
126 HTTP_FOLLOW_INITIAL
127 };
128 extern enum http_follow_config http_follow_config;
129
missing__target(int code,int result)130 static inline int missing__target(int code, int result)
131 {
132 return /* file:// URL -- do we ever use one??? */
133 (result == CURLE_FILE_COULDNT_READ_FILE) ||
134 /* http:// and https:// URL */
135 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
136 /* ftp:// URL */
137 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
138 ;
139 }
140
141 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
142
143 /*
144 * Normalize curl results to handle CURL_FAILONERROR (or lack thereof). Failing
145 * http codes have their "result" converted to CURLE_HTTP_RETURNED_ERROR, and
146 * an appropriate string placed in the errorstr buffer (pass curl_errorstr if
147 * you don't have a custom buffer).
148 */
149 void normalize_curl_result(CURLcode *result, long http_code, char *errorstr,
150 size_t errorlen);
151
152 /* Helpers for modifying and creating URLs */
153 void append_remote_object_url(struct strbuf *buf, const char *url,
154 const char *hex,
155 int only_two_digit_prefix);
156 char *get_remote_object_url(const char *url, const char *hex,
157 int only_two_digit_prefix);
158
159 /* Options for http_get_*() */
160 struct http_get_options {
161 unsigned no_cache:1,
162 initial_request:1;
163
164 /* If non-NULL, returns the content-type of the response. */
165 struct strbuf *content_type;
166
167 /*
168 * If non-NULL, and content_type above is non-NULL, returns
169 * the charset parameter from the content-type. If none is
170 * present, returns an empty string.
171 */
172 struct strbuf *charset;
173
174 /*
175 * If non-NULL, returns the URL we ended up at, including any
176 * redirects we followed.
177 */
178 struct strbuf *effective_url;
179
180 /*
181 * If both base_url and effective_url are non-NULL, the base URL will
182 * be munged to reflect any redirections going from the requested url
183 * to effective_url. See the definition of update_url_from_redirect
184 * for details.
185 */
186 struct strbuf *base_url;
187
188 /*
189 * If not NULL, contains additional HTTP headers to be sent with the
190 * request. The strings in the list must not be freed until after the
191 * request has completed.
192 */
193 struct string_list *extra_headers;
194 };
195
196 /* Return values for http_get_*() */
197 #define HTTP_OK 0
198 #define HTTP_MISSING_TARGET 1
199 #define HTTP_ERROR 2
200 #define HTTP_START_FAILED 3
201 #define HTTP_REAUTH 4
202 #define HTTP_NOAUTH 5
203
204 /*
205 * Requests a URL and stores the result in a strbuf.
206 *
207 * If the result pointer is NULL, a HTTP HEAD request is made instead of GET.
208 */
209 int http_get_strbuf(const char *url, struct strbuf *result, struct http_get_options *options);
210
211 int http_fetch_ref(const char *base, struct ref *ref);
212
213 /* Helpers for fetching packs */
214 int http_get_info_packs(const char *base_url,
215 struct packed_git **packs_head);
216
217 struct http_pack_request {
218 char *url;
219 struct packed_git *target;
220 struct packed_git **lst;
221 FILE *packfile;
222 struct strbuf tmpfile;
223 struct active_request_slot *slot;
224 };
225
226 struct http_pack_request *new_http_pack_request(
227 struct packed_git *target, const char *base_url);
228 int finish_http_pack_request(struct http_pack_request *preq);
229 void release_http_pack_request(struct http_pack_request *preq);
230
231 /* Helpers for fetching object */
232 struct http_object_request {
233 char *url;
234 struct strbuf tmpfile;
235 int localfile;
236 CURLcode curl_result;
237 char errorstr[CURL_ERROR_SIZE];
238 long http_code;
239 struct object_id oid;
240 struct object_id real_oid;
241 git_hash_ctx c;
242 git_zstream stream;
243 int zret;
244 int rename;
245 struct active_request_slot *slot;
246 };
247
248 struct http_object_request *new_http_object_request(
249 const char *base_url, const struct object_id *oid);
250 void process_http_object_request(struct http_object_request *freq);
251 int finish_http_object_request(struct http_object_request *freq);
252 void abort_http_object_request(struct http_object_request *freq);
253 void release_http_object_request(struct http_object_request *freq);
254
255 /* setup routine for curl_easy_setopt CURLOPT_DEBUGFUNCTION */
256 void setup_curl_trace(CURL *handle);
257 #endif /* HTTP_H */
258