зеркало из https://github.com/microsoft/git.git
Lazy load libcurl, allowing for an SSL/TLS backend-specific libcurl (#4410)
As per https://github.com/git-for-windows/git/issues/4350#issuecomment-1485041503, the major block for upgrading Git for Windows' OpenSSL from v1.1 to v3 is the tricky part where such an upgrade would break `git fetch`/`git clone` and `git push` because the libcurl depends on the OpenSSL DLL, and the major version bump will _change_ the file name of said DLL. To overcome that, the plan is to build libcurl flavors for each supported SSL/TLS backend, aligning with the way MSYS2 builds libcurl, then switch Git for Windows' SDK to the Secure Channel-flavored libcurl, and teach Git to look for the specific flavor of libcurl corresponding to the `http.sslBackend` setting (if that was configured). Here is the PR to teach Git that trick.
This commit is contained in:
Johannes Schindelin
Коммит
7cdcccdc68
32
Makefile
32
Makefile
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@ -464,6 +464,11 @@ include shared.mak
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#
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# CURL_LDFLAGS=-lcurl
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#
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# Define LAZYLOAD_LIBCURL to dynamically load the libcurl; This can be useful
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# if Multiple libcurl versions exist (with different file names) that link to
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# various SSL/TLS backends, to support the `http.sslBackend` runtime switch in
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# such a scenario.
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#
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# === Optional library: libpcre2 ===
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#
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# Define USE_LIBPCRE if you have and want to use libpcre. Various
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@ -1623,10 +1628,23 @@ else
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CURL_LIBCURL =
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endif
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ifndef CURL_LDFLAGS
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CURL_LDFLAGS = $(eval CURL_LDFLAGS := $$(shell $$(CURL_CONFIG) --libs))$(CURL_LDFLAGS)
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ifdef LAZYLOAD_LIBCURL
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LAZYLOAD_LIBCURL_OBJ = compat/lazyload-curl.o
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OBJECTS += $(LAZYLOAD_LIBCURL_OBJ)
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# The `CURL_STATICLIB` constant must be defined to avoid seeing the functions
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# declared as DLL imports
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CURL_CFLAGS = -DCURL_STATICLIB
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ifneq ($(uname_S),MINGW)
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ifneq ($(uname_S),Windows)
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CURL_LIBCURL = -ldl
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endif
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endif
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else
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ifndef CURL_LDFLAGS
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CURL_LDFLAGS = $(eval CURL_LDFLAGS := $$(shell $$(CURL_CONFIG) --libs))$(CURL_LDFLAGS)
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endif
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CURL_LIBCURL += $(CURL_LDFLAGS)
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endif
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CURL_LIBCURL += $(CURL_LDFLAGS)
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ifndef CURL_CFLAGS
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CURL_CFLAGS = $(eval CURL_CFLAGS := $$(shell $$(CURL_CONFIG) --cflags))$(CURL_CFLAGS)
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@ -1647,7 +1665,7 @@ else
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endif
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ifdef USE_CURL_FOR_IMAP_SEND
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BASIC_CFLAGS += -DUSE_CURL_FOR_IMAP_SEND
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IMAP_SEND_BUILDDEPS = http.o
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IMAP_SEND_BUILDDEPS = http.o $(LAZYLOAD_LIBCURL_OBJ)
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IMAP_SEND_LDFLAGS += $(CURL_LIBCURL)
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endif
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ifndef NO_EXPAT
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@ -2856,10 +2874,10 @@ git-imap-send$X: imap-send.o $(IMAP_SEND_BUILDDEPS) GIT-LDFLAGS $(GITLIBS)
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$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
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$(IMAP_SEND_LDFLAGS) $(LIBS)
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git-http-fetch$X: http.o http-walker.o http-fetch.o GIT-LDFLAGS $(GITLIBS)
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git-http-fetch$X: http.o http-walker.o http-fetch.o $(LAZYLOAD_LIBCURL_OBJ) GIT-LDFLAGS $(GITLIBS)
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$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
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$(CURL_LIBCURL) $(LIBS)
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git-http-push$X: http.o http-push.o GIT-LDFLAGS $(GITLIBS)
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git-http-push$X: http.o http-push.o $(LAZYLOAD_LIBCURL_OBJ) GIT-LDFLAGS $(GITLIBS)
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$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
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$(CURL_LIBCURL) $(EXPAT_LIBEXPAT) $(LIBS)
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@ -2869,7 +2887,7 @@ $(REMOTE_CURL_ALIASES): $(REMOTE_CURL_PRIMARY)
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ln -s $< $@ 2>/dev/null || \
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cp $< $@
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$(REMOTE_CURL_PRIMARY): remote-curl.o http.o http-walker.o GIT-LDFLAGS $(GITLIBS)
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$(REMOTE_CURL_PRIMARY): remote-curl.o http.o http-walker.o $(LAZYLOAD_LIBCURL_OBJ) GIT-LDFLAGS $(GITLIBS)
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$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
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$(CURL_LIBCURL) $(EXPAT_LIBEXPAT) $(LIBS)
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@ -0,0 +1,408 @@
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#include "../git-compat-util.h"
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#include "../git-curl-compat.h"
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#ifndef WIN32
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#include <dlfcn.h>
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#endif
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/*
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* The ABI version of libcurl is encoded in its shared libraries' file names.
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* This ABI version has not changed since October 2006 and is unlikely to be
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* changed in the future. See https://curl.se/libcurl/abi.html for details.
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*/
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#define LIBCURL_ABI_VERSION "4"
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typedef void (*func_t)(void);
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#ifndef WIN32
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#ifdef __APPLE__
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#define LIBCURL_FILE_NAME(base) base "." LIBCURL_ABI_VERSION ".dylib"
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#else
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#define LIBCURL_FILE_NAME(base) base ".so." LIBCURL_ABI_VERSION
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#endif
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static void *load_library(const char *name)
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{
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return dlopen(name, RTLD_LAZY);
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}
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static func_t load_function(void *handle, const char *name)
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{
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/*
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* Casting the return value of `dlsym()` to a function pointer is
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* explicitly allowed in recent POSIX standards, but GCC complains
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* about this in pedantic mode nevertheless. For more about this issue,
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* see https://stackoverflow.com/q/31526876/1860823 and
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* http://stackoverflow.com/a/36385690/1905491.
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*/
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func_t f;
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*(void **)&f = dlsym(handle, name);
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return f;
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}
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#else
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#define LIBCURL_FILE_NAME(base) base "-" LIBCURL_ABI_VERSION ".dll"
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static void *load_library(const char *name)
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{
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size_t name_size = strlen(name) + 1;
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const char *path = getenv("PATH");
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char dll_path[MAX_PATH];
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while (path && *path) {
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const char *sep = strchrnul(path, ';');
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size_t len = sep - path;
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if (len && len + name_size < sizeof(dll_path)) {
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memcpy(dll_path, path, len);
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dll_path[len] = '/';
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memcpy(dll_path + len + 1, name, name_size);
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if (!access(dll_path, R_OK)) {
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wchar_t wpath[MAX_PATH];
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int wlen = MultiByteToWideChar(CP_UTF8, 0, dll_path, -1, wpath, ARRAY_SIZE(wpath));
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void *res = wlen ? (void *)LoadLibraryExW(wpath, NULL, 0) : NULL;
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if (!res) {
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DWORD err = GetLastError();
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char buf[1024];
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if (!FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_ARGUMENT_ARRAY |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, err, LANG_NEUTRAL,
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buf, sizeof(buf) - 1, NULL))
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xsnprintf(buf, sizeof(buf), "last error: %ld", err);
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error("LoadLibraryExW() failed with: %s", buf);
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}
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return res;
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}
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}
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path = *sep ? sep + 1 : NULL;
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}
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return NULL;
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}
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static func_t load_function(void *handle, const char *name)
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{
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return (func_t)GetProcAddress((HANDLE)handle, name);
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}
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#endif
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typedef char *(*curl_easy_escape_type)(CURL *handle, const char *string, int length);
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static curl_easy_escape_type curl_easy_escape_func;
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typedef void (*curl_free_type)(void *p);
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static curl_free_type curl_free_func;
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typedef CURLcode (*curl_global_init_type)(long flags);
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static curl_global_init_type curl_global_init_func;
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typedef CURLsslset (*curl_global_sslset_type)(curl_sslbackend id, const char *name, const curl_ssl_backend ***avail);
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static curl_global_sslset_type curl_global_sslset_func;
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typedef void (*curl_global_cleanup_type)(void);
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static curl_global_cleanup_type curl_global_cleanup_func;
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typedef struct curl_slist *(*curl_slist_append_type)(struct curl_slist *list, const char *data);
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static curl_slist_append_type curl_slist_append_func;
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typedef void (*curl_slist_free_all_type)(struct curl_slist *list);
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static curl_slist_free_all_type curl_slist_free_all_func;
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typedef const char *(*curl_easy_strerror_type)(CURLcode error);
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static curl_easy_strerror_type curl_easy_strerror_func;
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typedef CURLM *(*curl_multi_init_type)(void);
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static curl_multi_init_type curl_multi_init_func;
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typedef CURLMcode (*curl_multi_add_handle_type)(CURLM *multi_handle, CURL *curl_handle);
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static curl_multi_add_handle_type curl_multi_add_handle_func;
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typedef CURLMcode (*curl_multi_remove_handle_type)(CURLM *multi_handle, CURL *curl_handle);
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static curl_multi_remove_handle_type curl_multi_remove_handle_func;
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typedef CURLMcode (*curl_multi_fdset_type)(CURLM *multi_handle, fd_set *read_fd_set, fd_set *write_fd_set, fd_set *exc_fd_set, int *max_fd);
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static curl_multi_fdset_type curl_multi_fdset_func;
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typedef CURLMcode (*curl_multi_perform_type)(CURLM *multi_handle, int *running_handles);
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static curl_multi_perform_type curl_multi_perform_func;
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typedef CURLMcode (*curl_multi_cleanup_type)(CURLM *multi_handle);
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static curl_multi_cleanup_type curl_multi_cleanup_func;
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typedef CURLMsg *(*curl_multi_info_read_type)(CURLM *multi_handle, int *msgs_in_queue);
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static curl_multi_info_read_type curl_multi_info_read_func;
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typedef const char *(*curl_multi_strerror_type)(CURLMcode error);
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static curl_multi_strerror_type curl_multi_strerror_func;
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typedef CURLMcode (*curl_multi_timeout_type)(CURLM *multi_handle, long *milliseconds);
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static curl_multi_timeout_type curl_multi_timeout_func;
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typedef CURL *(*curl_easy_init_type)(void);
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static curl_easy_init_type curl_easy_init_func;
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typedef CURLcode (*curl_easy_perform_type)(CURL *curl);
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static curl_easy_perform_type curl_easy_perform_func;
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typedef void (*curl_easy_cleanup_type)(CURL *curl);
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static curl_easy_cleanup_type curl_easy_cleanup_func;
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typedef CURL *(*curl_easy_duphandle_type)(CURL *curl);
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static curl_easy_duphandle_type curl_easy_duphandle_func;
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typedef CURLcode (*curl_easy_getinfo_long_type)(CURL *curl, CURLINFO info, long *value);
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static curl_easy_getinfo_long_type curl_easy_getinfo_long_func;
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typedef CURLcode (*curl_easy_getinfo_pointer_type)(CURL *curl, CURLINFO info, void **value);
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static curl_easy_getinfo_pointer_type curl_easy_getinfo_pointer_func;
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typedef CURLcode (*curl_easy_getinfo_off_t_type)(CURL *curl, CURLINFO info, curl_off_t *value);
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static curl_easy_getinfo_off_t_type curl_easy_getinfo_off_t_func;
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typedef CURLcode (*curl_easy_setopt_long_type)(CURL *curl, CURLoption opt, long value);
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static curl_easy_setopt_long_type curl_easy_setopt_long_func;
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typedef CURLcode (*curl_easy_setopt_pointer_type)(CURL *curl, CURLoption opt, void *value);
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static curl_easy_setopt_pointer_type curl_easy_setopt_pointer_func;
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typedef CURLcode (*curl_easy_setopt_off_t_type)(CURL *curl, CURLoption opt, curl_off_t value);
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static curl_easy_setopt_off_t_type curl_easy_setopt_off_t_func;
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static char ssl_backend[64];
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static void lazy_load_curl(void)
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{
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static int initialized;
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void *libcurl = NULL;
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func_t curl_easy_getinfo_func, curl_easy_setopt_func;
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if (initialized)
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return;
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initialized = 1;
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if (ssl_backend[0]) {
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char dll_name[64 + 16];
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snprintf(dll_name, sizeof(dll_name) - 1,
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LIBCURL_FILE_NAME("libcurl-%s"), ssl_backend);
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libcurl = load_library(dll_name);
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}
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if (!libcurl)
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libcurl = load_library(LIBCURL_FILE_NAME("libcurl"));
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if (!libcurl)
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die("failed to load library '%s'", LIBCURL_FILE_NAME("libcurl"));
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curl_easy_escape_func = (curl_easy_escape_type)load_function(libcurl, "curl_easy_escape");
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curl_free_func = (curl_free_type)load_function(libcurl, "curl_free");
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curl_global_init_func = (curl_global_init_type)load_function(libcurl, "curl_global_init");
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curl_global_sslset_func = (curl_global_sslset_type)load_function(libcurl, "curl_global_sslset");
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curl_global_cleanup_func = (curl_global_cleanup_type)load_function(libcurl, "curl_global_cleanup");
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curl_slist_append_func = (curl_slist_append_type)load_function(libcurl, "curl_slist_append");
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curl_slist_free_all_func = (curl_slist_free_all_type)load_function(libcurl, "curl_slist_free_all");
|
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curl_easy_strerror_func = (curl_easy_strerror_type)load_function(libcurl, "curl_easy_strerror");
|
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curl_multi_init_func = (curl_multi_init_type)load_function(libcurl, "curl_multi_init");
|
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curl_multi_add_handle_func = (curl_multi_add_handle_type)load_function(libcurl, "curl_multi_add_handle");
|
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curl_multi_remove_handle_func = (curl_multi_remove_handle_type)load_function(libcurl, "curl_multi_remove_handle");
|
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curl_multi_fdset_func = (curl_multi_fdset_type)load_function(libcurl, "curl_multi_fdset");
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curl_multi_perform_func = (curl_multi_perform_type)load_function(libcurl, "curl_multi_perform");
|
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curl_multi_cleanup_func = (curl_multi_cleanup_type)load_function(libcurl, "curl_multi_cleanup");
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curl_multi_info_read_func = (curl_multi_info_read_type)load_function(libcurl, "curl_multi_info_read");
|
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curl_multi_strerror_func = (curl_multi_strerror_type)load_function(libcurl, "curl_multi_strerror");
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curl_multi_timeout_func = (curl_multi_timeout_type)load_function(libcurl, "curl_multi_timeout");
|
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curl_easy_init_func = (curl_easy_init_type)load_function(libcurl, "curl_easy_init");
|
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curl_easy_perform_func = (curl_easy_perform_type)load_function(libcurl, "curl_easy_perform");
|
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curl_easy_cleanup_func = (curl_easy_cleanup_type)load_function(libcurl, "curl_easy_cleanup");
|
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curl_easy_duphandle_func = (curl_easy_duphandle_type)load_function(libcurl, "curl_easy_duphandle");
|
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|
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curl_easy_getinfo_func = load_function(libcurl, "curl_easy_getinfo");
|
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curl_easy_getinfo_long_func = (curl_easy_getinfo_long_type)curl_easy_getinfo_func;
|
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curl_easy_getinfo_pointer_func = (curl_easy_getinfo_pointer_type)curl_easy_getinfo_func;
|
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curl_easy_getinfo_off_t_func = (curl_easy_getinfo_off_t_type)curl_easy_getinfo_func;
|
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|
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curl_easy_setopt_func = load_function(libcurl, "curl_easy_setopt");
|
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curl_easy_setopt_long_func = (curl_easy_setopt_long_type)curl_easy_setopt_func;
|
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curl_easy_setopt_pointer_func = (curl_easy_setopt_pointer_type)curl_easy_setopt_func;
|
||||
curl_easy_setopt_off_t_func = (curl_easy_setopt_off_t_type)curl_easy_setopt_func;
|
||||
}
|
||||
|
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char *curl_easy_escape(CURL *handle, const char *string, int length)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_easy_escape_func(handle, string, length);
|
||||
}
|
||||
|
||||
void curl_free(void *p)
|
||||
{
|
||||
lazy_load_curl();
|
||||
curl_free_func(p);
|
||||
}
|
||||
|
||||
CURLcode curl_global_init(long flags)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_global_init_func(flags);
|
||||
}
|
||||
|
||||
CURLsslset curl_global_sslset(curl_sslbackend id, const char *name, const curl_ssl_backend ***avail)
|
||||
{
|
||||
if (name && strlen(name) < sizeof(ssl_backend))
|
||||
strlcpy(ssl_backend, name, sizeof(ssl_backend));
|
||||
|
||||
lazy_load_curl();
|
||||
return curl_global_sslset_func(id, name, avail);
|
||||
}
|
||||
|
||||
void curl_global_cleanup(void)
|
||||
{
|
||||
lazy_load_curl();
|
||||
curl_global_cleanup_func();
|
||||
}
|
||||
|
||||
struct curl_slist *curl_slist_append(struct curl_slist *list, const char *data)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_slist_append_func(list, data);
|
||||
}
|
||||
|
||||
void curl_slist_free_all(struct curl_slist *list)
|
||||
{
|
||||
lazy_load_curl();
|
||||
curl_slist_free_all_func(list);
|
||||
}
|
||||
|
||||
const char *curl_easy_strerror(CURLcode error)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_easy_strerror_func(error);
|
||||
}
|
||||
|
||||
CURLM *curl_multi_init(void)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_init_func();
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *curl_handle)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_add_handle_func(multi_handle, curl_handle);
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_remove_handle(CURLM *multi_handle, CURL *curl_handle)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_remove_handle_func(multi_handle, curl_handle);
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_fdset(CURLM *multi_handle, fd_set *read_fd_set, fd_set *write_fd_set, fd_set *exc_fd_set, int *max_fd)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_fdset_func(multi_handle, read_fd_set, write_fd_set, exc_fd_set, max_fd);
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_perform_func(multi_handle, running_handles);
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_cleanup(CURLM *multi_handle)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_cleanup_func(multi_handle);
|
||||
}
|
||||
|
||||
CURLMsg *curl_multi_info_read(CURLM *multi_handle, int *msgs_in_queue)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_info_read_func(multi_handle, msgs_in_queue);
|
||||
}
|
||||
|
||||
const char *curl_multi_strerror(CURLMcode error)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_strerror_func(error);
|
||||
}
|
||||
|
||||
CURLMcode curl_multi_timeout(CURLM *multi_handle, long *milliseconds)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_multi_timeout_func(multi_handle, milliseconds);
|
||||
}
|
||||
|
||||
CURL *curl_easy_init(void)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_easy_init_func();
|
||||
}
|
||||
|
||||
CURLcode curl_easy_perform(CURL *curl)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_easy_perform_func(curl);
|
||||
}
|
||||
|
||||
void curl_easy_cleanup(CURL *curl)
|
||||
{
|
||||
lazy_load_curl();
|
||||
curl_easy_cleanup_func(curl);
|
||||
}
|
||||
|
||||
CURL *curl_easy_duphandle(CURL *curl)
|
||||
{
|
||||
lazy_load_curl();
|
||||
return curl_easy_duphandle_func(curl);
|
||||
}
|
||||
|
||||
#ifndef CURL_IGNORE_DEPRECATION
|
||||
#define CURL_IGNORE_DEPRECATION(x) x
|
||||
#endif
|
||||
|
||||
#ifndef CURLOPTTYPE_BLOB
|
||||
#define CURLOPTTYPE_BLOB 40000
|
||||
#endif
|
||||
|
||||
#undef curl_easy_getinfo
|
||||
CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ...)
|
||||
{
|
||||
va_list ap;
|
||||
CURLcode res;
|
||||
|
||||
va_start(ap, info);
|
||||
lazy_load_curl();
|
||||
CURL_IGNORE_DEPRECATION(
|
||||
if (info >= CURLINFO_LONG && info < CURLINFO_DOUBLE)
|
||||
res = curl_easy_getinfo_long_func(curl, info, va_arg(ap, long *));
|
||||
else if ((info >= CURLINFO_STRING && info < CURLINFO_LONG) ||
|
||||
(info >= CURLINFO_SLIST && info < CURLINFO_SOCKET))
|
||||
res = curl_easy_getinfo_pointer_func(curl, info, va_arg(ap, void **));
|
||||
else if (info >= CURLINFO_OFF_T)
|
||||
res = curl_easy_getinfo_off_t_func(curl, info, va_arg(ap, curl_off_t *));
|
||||
else
|
||||
die("%s:%d: TODO (info: %d)!", __FILE__, __LINE__, info);
|
||||
)
|
||||
va_end(ap);
|
||||
return res;
|
||||
}
|
||||
|
||||
#undef curl_easy_setopt
|
||||
CURLcode curl_easy_setopt(CURL *curl, CURLoption opt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
CURLcode res;
|
||||
|
||||
va_start(ap, opt);
|
||||
lazy_load_curl();
|
||||
CURL_IGNORE_DEPRECATION(
|
||||
if (opt >= CURLOPTTYPE_LONG && opt < CURLOPTTYPE_OBJECTPOINT)
|
||||
res = curl_easy_setopt_long_func(curl, opt, va_arg(ap, long));
|
||||
else if (opt >= CURLOPTTYPE_OBJECTPOINT && opt < CURLOPTTYPE_OFF_T)
|
||||
res = curl_easy_setopt_pointer_func(curl, opt, va_arg(ap, void *));
|
||||
else if (opt >= CURLOPTTYPE_OFF_T && opt < CURLOPTTYPE_BLOB)
|
||||
res = curl_easy_setopt_off_t_func(curl, opt, va_arg(ap, curl_off_t));
|
||||
else
|
||||
die("%s:%d: TODO (opt: %d)!", __FILE__, __LINE__, opt);
|
||||
)
|
||||
va_end(ap);
|
||||
return res;
|
||||
}
|
||||
|
|
@ -694,6 +694,7 @@ ifeq ($(uname_S),MINGW)
|
|||
HAVE_PLATFORM_PROCINFO = YesPlease
|
||||
CSPRNG_METHOD = rtlgenrandom
|
||||
BASIC_LDFLAGS += -municode -Wl,--tsaware
|
||||
LAZYLOAD_LIBCURL = YesDoThatPlease
|
||||
COMPAT_CFLAGS += -DNOGDI -Icompat -Icompat/win32
|
||||
COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
|
||||
COMPAT_OBJS += compat/mingw.o compat/winansi.o \
|
||||
|
|
|
|||
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