thodg/libgit2/src/libgit2.c

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• Hash : 0903cac1
  Author :
  Date : 2021-08-11T01:30:38
  

  openssl: dynamically load libssl and symbols (optionally) Provide an interface around OpenSSL to dynamically load the libraries and symbols, so that users can distribute a libgit2 library that is not linked directly against OpenSSL. This enables users to target multiple distributions with a single binary. This mechanism is optional and disabled by default. Configure cmake with -DUSE_HTTPS=OpenSSL-Dynamic to use it.

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• src/libgit2.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "libgit2.h"
  
  #include <git2.h>
  #include "alloc.h"
  #include "cache.h"
  #include "common.h"
  #include "filter.h"
  #include "hash.h"
  #include "index.h"
  #include "merge_driver.h"
  #include "pool.h"
  #include "mwindow.h"
  #include "object.h"
  #include "odb.h"
  #include "refs.h"
  #include "runtime.h"
  #include "sysdir.h"
  #include "thread.h"
  #include "threadstate.h"
  #include "git2/global.h"
  #include "streams/registry.h"
  #include "streams/mbedtls.h"
  #include "streams/openssl.h"
  #include "transports/smart.h"
  #include "transports/http.h"
  #include "transports/ssh.h"
  
  #ifdef GIT_WIN32
  # include "win32/w32_leakcheck.h"
  #endif
  
  /* Declarations for tuneable settings */
  extern size_t git_mwindow__window_size;
  extern size_t git_mwindow__mapped_limit;
  extern size_t git_mwindow__file_limit;
  extern size_t git_indexer__max_objects;
  extern bool git_disable_pack_keep_file_checks;
  extern int git_odb__packed_priority;
  extern int git_odb__loose_priority;
  
  char *git__user_agent;
  char *git__ssl_ciphers;
  
  static void libgit2_settings_global_shutdown(void)
  {
  	git__free(git__user_agent);
  	git__free(git__ssl_ciphers);
  }
  
  static int git_libgit2_settings_global_init(void)
  {
  	return git_runtime_shutdown_register(libgit2_settings_global_shutdown);
  }
  
  int git_libgit2_init(void)
  {
  	static git_runtime_init_fn init_fns[] = {
  #ifdef GIT_WIN32
  		git_win32_leakcheck_global_init,
  #endif
  		git_allocator_global_init,
  		git_threadstate_global_init,
  		git_threads_global_init,
  		git_hash_global_init,
  		git_sysdir_global_init,
  		git_filter_global_init,
  		git_merge_driver_global_init,
  		git_transport_ssh_global_init,
  		git_stream_registry_global_init,
  		git_openssl_stream_global_init,
  		git_mbedtls_stream_global_init,
  		git_mwindow_global_init,
  		git_pool_global_init,
  		git_libgit2_settings_global_init
  	};
  
  	return git_runtime_init(init_fns, ARRAY_SIZE(init_fns));
  }
  
  int git_libgit2_init_count(void)
  {
  	return git_runtime_init_count();
  }
  
  int git_libgit2_shutdown(void)
  {
  	return git_runtime_shutdown();
  }
  
  int git_libgit2_version(int *major, int *minor, int *rev)
  {
  	*major = LIBGIT2_VER_MAJOR;
  	*minor = LIBGIT2_VER_MINOR;
  	*rev = LIBGIT2_VER_REVISION;
  
  	return 0;
  }
  
  int git_libgit2_features(void)
  {
  	return 0
  #ifdef GIT_THREADS
  		| GIT_FEATURE_THREADS
  #endif
  #ifdef GIT_HTTPS
  		| GIT_FEATURE_HTTPS
  #endif
  #if defined(GIT_SSH)
  		| GIT_FEATURE_SSH
  #endif
  #if defined(GIT_USE_NSEC)
  		| GIT_FEATURE_NSEC
  #endif
  	;
  }
  
  static int config_level_to_sysdir(int *out, int config_level)
  {
  	switch (config_level) {
  	case GIT_CONFIG_LEVEL_SYSTEM:
  		*out = GIT_SYSDIR_SYSTEM;
  		return 0;
  	case GIT_CONFIG_LEVEL_XDG:
  		*out = GIT_SYSDIR_XDG;
  		return 0;
  	case GIT_CONFIG_LEVEL_GLOBAL:
  		*out = GIT_SYSDIR_GLOBAL;
  		return 0;
  	case GIT_CONFIG_LEVEL_PROGRAMDATA:
  		*out = GIT_SYSDIR_PROGRAMDATA;
  		return 0;
  	default:
  		break;
  	}
  
  	git_error_set(
  		GIT_ERROR_INVALID, "invalid config path selector %d", config_level);
  	return -1;
  }
  
  const char *git_libgit2__user_agent(void)
  {
  	return git__user_agent;
  }
  
  const char *git_libgit2__ssl_ciphers(void)
  {
  	return git__ssl_ciphers;
  }
  
  int git_libgit2_opts(int key, ...)
  {
  	int error = 0;
  	va_list ap;
  
  	va_start(ap, key);
  
  	switch (key) {
  	case GIT_OPT_SET_MWINDOW_SIZE:
  		git_mwindow__window_size = va_arg(ap, size_t);
  		break;
  
  	case GIT_OPT_GET_MWINDOW_SIZE:
  		*(va_arg(ap, size_t *)) = git_mwindow__window_size;
  		break;
  
  	case GIT_OPT_SET_MWINDOW_MAPPED_LIMIT:
  		git_mwindow__mapped_limit = va_arg(ap, size_t);
  		break;
  
  	case GIT_OPT_GET_MWINDOW_MAPPED_LIMIT:
  		*(va_arg(ap, size_t *)) = git_mwindow__mapped_limit;
  		break;
  
  	case GIT_OPT_SET_MWINDOW_FILE_LIMIT:
  		git_mwindow__file_limit = va_arg(ap, size_t);
  		break;
  
  	case GIT_OPT_GET_MWINDOW_FILE_LIMIT:
  		*(va_arg(ap, size_t *)) = git_mwindow__file_limit;
  		break;
  
  	case GIT_OPT_GET_SEARCH_PATH:
  		{
  			int sysdir = va_arg(ap, int);
  			git_buf *out = va_arg(ap, git_buf *);
  			const git_buf *tmp;
  			int level;
  
  			if ((error = config_level_to_sysdir(&level, sysdir)) < 0 ||
  			    (error = git_buf_sanitize(out)) < 0 ||
  			    (error = git_sysdir_get(&tmp, level)) < 0)
  				break;
  
  			error = git_buf_sets(out, tmp->ptr);
  		}
  		break;
  
  	case GIT_OPT_SET_SEARCH_PATH:
  		{
  			int level;
  
  			if ((error = config_level_to_sysdir(&level, va_arg(ap, int))) >= 0)
  				error = git_sysdir_set(level, va_arg(ap, const char *));
  		}
  		break;
  
  	case GIT_OPT_SET_CACHE_OBJECT_LIMIT:
  		{
  			git_object_t type = (git_object_t)va_arg(ap, int);
  			size_t size = va_arg(ap, size_t);
  			error = git_cache_set_max_object_size(type, size);
  			break;
  		}
  
  	case GIT_OPT_SET_CACHE_MAX_SIZE:
  		git_cache__max_storage = va_arg(ap, ssize_t);
  		break;
  
  	case GIT_OPT_ENABLE_CACHING:
  		git_cache__enabled = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_GET_CACHED_MEMORY:
  		*(va_arg(ap, ssize_t *)) = git_cache__current_storage.val;
  		*(va_arg(ap, ssize_t *)) = git_cache__max_storage;
  		break;
  
  	case GIT_OPT_GET_TEMPLATE_PATH:
  		{
  			git_buf *out = va_arg(ap, git_buf *);
  			const git_buf *tmp;
  
  			if ((error = git_buf_sanitize(out)) < 0 ||
  			    (error = git_sysdir_get(&tmp, GIT_SYSDIR_TEMPLATE)) < 0)
  				break;
  
  			error = git_buf_sets(out, tmp->ptr);
  		}
  		break;
  
  	case GIT_OPT_SET_TEMPLATE_PATH:
  		error = git_sysdir_set(GIT_SYSDIR_TEMPLATE, va_arg(ap, const char *));
  		break;
  
  	case GIT_OPT_SET_SSL_CERT_LOCATIONS:
  #ifdef GIT_OPENSSL
  		{
  			const char *file = va_arg(ap, const char *);
  			const char *path = va_arg(ap, const char *);
  			error = git_openssl__set_cert_location(file, path);
  		}
  #elif defined(GIT_MBEDTLS)
  		{
  			const char *file = va_arg(ap, const char *);
  			const char *path = va_arg(ap, const char *);
  			if (file)
  				error = git_mbedtls__set_cert_location(file, 0);
  			if (error && path)
  				error = git_mbedtls__set_cert_location(path, 1);
  		}
  #else
  		git_error_set(GIT_ERROR_SSL, "TLS backend doesn't support certificate locations");
  		error = -1;
  #endif
  		break;
  	case GIT_OPT_SET_USER_AGENT:
  		git__free(git__user_agent);
  		git__user_agent = git__strdup(va_arg(ap, const char *));
  		if (!git__user_agent) {
  			git_error_set_oom();
  			error = -1;
  		}
  
  		break;
  
  	case GIT_OPT_ENABLE_STRICT_OBJECT_CREATION:
  		git_object__strict_input_validation = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_ENABLE_STRICT_SYMBOLIC_REF_CREATION:
  		git_reference__enable_symbolic_ref_target_validation = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_SET_SSL_CIPHERS:
  #if (GIT_OPENSSL || GIT_MBEDTLS)
  		{
  			git__free(git__ssl_ciphers);
  			git__ssl_ciphers = git__strdup(va_arg(ap, const char *));
  			if (!git__ssl_ciphers) {
  				git_error_set_oom();
  				error = -1;
  			}
  		}
  #else
  		git_error_set(GIT_ERROR_SSL, "TLS backend doesn't support custom ciphers");
  		error = -1;
  #endif
  		break;
  
  	case GIT_OPT_GET_USER_AGENT:
  		{
  			git_buf *out = va_arg(ap, git_buf *);
  			if ((error = git_buf_sanitize(out)) < 0)
  				break;
  			error = git_buf_sets(out, git__user_agent);
  		}
  		break;
  
  	case GIT_OPT_ENABLE_OFS_DELTA:
  		git_smart__ofs_delta_enabled = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_ENABLE_FSYNC_GITDIR:
  		git_repository__fsync_gitdir = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_GET_WINDOWS_SHAREMODE:
  #ifdef GIT_WIN32
  		*(va_arg(ap, unsigned long *)) = git_win32__createfile_sharemode;
  #endif
  		break;
  
  	case GIT_OPT_SET_WINDOWS_SHAREMODE:
  #ifdef GIT_WIN32
  		git_win32__createfile_sharemode = va_arg(ap, unsigned long);
  #endif
  		break;
  
  	case GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION:
  		git_odb__strict_hash_verification = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_SET_ALLOCATOR:
  		error = git_allocator_setup(va_arg(ap, git_allocator *));
  		break;
  
  	case GIT_OPT_ENABLE_UNSAVED_INDEX_SAFETY:
  		git_index__enforce_unsaved_safety = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_SET_PACK_MAX_OBJECTS:
  		git_indexer__max_objects = va_arg(ap, size_t);
  		break;
  
  	case GIT_OPT_GET_PACK_MAX_OBJECTS:
  		*(va_arg(ap, size_t *)) = git_indexer__max_objects;
  		break;
  
  	case GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS:
  		git_disable_pack_keep_file_checks = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_ENABLE_HTTP_EXPECT_CONTINUE:
  		git_http__expect_continue = (va_arg(ap, int) != 0);
  		break;
  
  	case GIT_OPT_SET_ODB_PACKED_PRIORITY:
  		git_odb__packed_priority = va_arg(ap, int);
  		break;
  
  	case GIT_OPT_SET_ODB_LOOSE_PRIORITY:
  		git_odb__loose_priority = va_arg(ap, int);
  		break;
  
  	default:
  		git_error_set(GIT_ERROR_INVALID, "invalid option key");
  		error = -1;
  	}
  
  	va_end(ap);
  
  	return error;
  }
  

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