#ifdef HAVE_LIBETPAN
#include "imap-thread.h"
-
+#include <imap.h>
#include <sys/types.h>
#include <sys/stat.h>
+#if (defined(__DragonFly__) || defined (__NetBSD__) || defined (__FreeBSD__) || defined (__CYGWIN__))
+#include <sys/socket.h>
+#endif
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <gtk/gtk.h>
+#include <log.h>
#include "etpan-thread-manager.h"
+#include "utils.h"
+#include "ssl_certificate.h"
+#include "socket.h"
+
+#define DISABLE_LOG_DURING_LOGIN
static struct etpan_thread_manager * thread_manager = NULL;
+static chash * courier_workaround_hash = NULL;
static chash * imap_hash = NULL;
static chash * session_hash = NULL;
static guint thread_manager_signal = 0;
return TRUE;
}
+void imap_logger_cmd(int direction, const char * str, size_t size)
+{
+ gchar *buf;
+ gchar **lines;
+ int i = 0;
+
+ buf = malloc(size+1);
+ memset(buf, 0, size+1);
+ strncpy(buf, str, size);
+ buf[size] = '\0';
+
+ if (!strncmp(buf, "<<<<<<<", 7)
+ || !strncmp(buf, ">>>>>>>", 7)) {
+ free(buf);
+ return;
+ }
+ while (strstr(buf, "\r"))
+ *strstr(buf, "\r") = ' ';
+ while (strlen(buf) > 0 && buf[strlen(buf)-1] == '\n')
+ buf[strlen(buf)-1] = '\0';
+
+ lines = g_strsplit(buf, "\n", -1);
+
+ while (lines[i] && *lines[i]) {
+ log_print("IMAP4%c %s\n", direction?'>':'<', lines[i]);
+ i++;
+ }
+ g_strfreev(lines);
+ free(buf);
+}
+
+void imap_logger_fetch(int direction, const char * str, size_t size)
+{
+ gchar *buf;
+ gchar **lines;
+ int i = 0;
+
+ buf = malloc(size+1);
+ memset(buf, 0, size+1);
+ strncpy(buf, str, size);
+ buf[size] = '\0';
+ if (!strncmp(buf, "<<<<<<<", 7)
+ || !strncmp(buf, ">>>>>>>", 7)) {
+ free(buf);
+ return;
+ }
+ while (strstr(buf, "\r"))
+ *strstr(buf, "\r") = ' ';
+ while (strlen(buf) > 0 && buf[strlen(buf)-1] == '\n')
+ buf[strlen(buf)-1] = '\0';
+
+ lines = g_strsplit(buf, "\n", -1);
+
+ if (direction != 0 || (buf[0] == '*' && buf[1] == ' ') || size < 32) {
+ while (lines[i] && *lines[i]) {
+ log_print("IMAP4%c %s\n", direction?'>':'<', lines[i]);
+ i++;
+ }
+ } else {
+ log_print("IMAP4%c [data - %zd bytes]\n", direction?'>':'<', size);
+ }
+ g_strfreev(lines);
+ free(buf);
+}
+
+void imap_logger_append(int direction, const char * str, size_t size)
+{
+ gchar *buf;
+ gchar **lines;
+ int i = 0;
+
+ buf = malloc(size+1);
+ memset(buf, 0, size+1);
+ strncpy(buf, str, size);
+ buf[size] = '\0';
+ if (!strncmp(buf, "<<<<<<<", 7)
+ || !strncmp(buf, ">>>>>>>", 7)) {
+ free(buf);
+ return;
+ }
+ while (strstr(buf, "\r"))
+ *strstr(buf, "\r") = ' ';
+ while (strlen(buf) > 0 && buf[strlen(buf)-1] == '\n')
+ buf[strlen(buf)-1] = '\0';
+
+ lines = g_strsplit(buf, "\n", -1);
+
+ if (direction == 0 || (buf[0] == '*' && buf[1] == ' ') || size < 64) {
+ while (lines[i] && *lines[i]) {
+ log_print("IMAP4%c %s\n", direction?'>':'<', lines[i]);
+ i++;
+ }
+ } else {
+ log_print("IMAP4%c [data - %zd bytes]\n", direction?'>':'<', size);
+ }
+ g_strfreev(lines);
+ free(buf);
+}
#define ETPAN_DEFAULT_NETWORK_TIMEOUT 60
+static gboolean etpan_skip_ssl_cert_check = FALSE;
-void imap_main_init(void)
+void imap_main_init(gboolean skip_ssl_cert_check)
{
int fd_thread_manager;
+ etpan_skip_ssl_cert_check = skip_ssl_cert_check;
mailstream_network_delay.tv_sec = ETPAN_DEFAULT_NETWORK_TIMEOUT;
mailstream_network_delay.tv_usec = 0;
-
-#if 0
+
mailstream_debug = 1;
-#endif
+ mailstream_logger = imap_logger_cmd;
+
imap_hash = chash_new(CHASH_COPYKEY, CHASH_DEFAULTSIZE);
session_hash = chash_new(CHASH_COPYKEY, CHASH_DEFAULTSIZE);
+ courier_workaround_hash = chash_new(CHASH_COPYKEY, CHASH_DEFAULTSIZE);
thread_manager = etpan_thread_manager_new();
void imap_main_done(void)
{
+ etpan_thread_manager_stop(thread_manager);
+ etpan_thread_manager_join(thread_manager);
+
g_source_remove(thread_manager_signal);
g_io_channel_unref(io_channel);
- etpan_thread_manager_stop(thread_manager);
- etpan_thread_manager_join(thread_manager);
etpan_thread_manager_free(thread_manager);
+ chash_free(courier_workaround_hash);
chash_free(session_hash);
chash_free(imap_hash);
}
thread = value.data;
- etpan_thread_stop(thread);
+ etpan_thread_unbind(thread);
chash_delete(imap_hash, &key, NULL);
+
+ debug_print("remove thread");
}
static struct etpan_thread * get_thread(Folder * folder)
int * p_finished;
p_finished = callback_data;
+
+ debug_print("generic_cb\n");
* p_finished = 1;
}
struct etpan_thread * thread;
int finished;
+ imap_folder_ref(folder);
+
op = etpan_thread_op_new();
op->param = param;
op->result = result;
}
etpan_thread_op_free(op);
+
+ imap_folder_unref(folder);
}
param.server = server;
param.port = port;
+ refresh_resolvers();
threaded_run(folder, ¶m, &result, connect_run);
debug_print("connect ok %i\n", result.error);
return result.error;
}
+static int etpan_certificate_check(const unsigned char *certificate, int len, void *data)
+{
+#ifdef USE_OPENSSL
+ struct connect_param *param = (struct connect_param *)data;
+ X509 *cert = NULL;
+
+ if (certificate == NULL || len < 0) {
+ g_warning("no cert presented.\n");
+ return 0;
+ }
+ cert = d2i_X509(NULL, (unsigned char **) &certificate, len);
+ if (cert == NULL) {
+ g_warning("can't get cert\n");
+ return 0;
+ } else if (ssl_certificate_check(cert,
+ (gchar *)param->server, (gushort)param->port) == TRUE) {
+ X509_free(cert);
+ return 0;
+ } else {
+ X509_free(cert);
+ return -1;
+ }
+#else
+ return 0;
+#endif
+}
static void connect_ssl_run(struct etpan_thread_op * op)
{
r = mailimap_ssl_connect(param->imap,
param->server, param->port);
-
result->error = r;
}
chashdatum key;
chashdatum value;
mailimap * imap;
-
+ unsigned char *certificate = NULL;
+ int cert_len;
+
imap = mailimap_new(0, NULL);
key.data = &folder;
param.server = server;
param.port = port;
+ refresh_resolvers();
threaded_run(folder, ¶m, &result, connect_ssl_run);
- debug_print("connect ok\n");
+ if (result.error >= 0 && !etpan_skip_ssl_cert_check) {
+ cert_len = mailstream_ssl_get_certificate(imap->imap_stream, &certificate);
+ if (etpan_certificate_check(certificate, cert_len, ¶m) < 0)
+ return -1;
+ if (certificate)
+ free(certificate);
+ }
+ debug_print("connect %d\n", result.error);
return result.error;
}
+
+struct capa_param {
+ mailimap * imap;
+};
+
+struct capa_result {
+ int error;
+ struct mailimap_capability_data *caps;
+};
+
+static void capability_run(struct etpan_thread_op * op)
+{
+ int r;
+ struct capa_param * param;
+ struct capa_result * result;
+ struct mailimap_capability_data *caps;
+
+ param = op->param;
+ result = op->result;
+
+ r = mailimap_capability(param->imap, &caps);
+
+ result->error = r;
+ result->caps = (r == 0 ? caps : NULL);
+}
+
+
+struct mailimap_capability_data * imap_threaded_capability(Folder *folder, int *ok)
+{
+ struct capa_param param;
+ struct capa_result result;
+ mailimap *imap;
+
+ imap = get_imap(folder);
+
+ param.imap = imap;
+
+ threaded_run(folder, ¶m, &result, capability_run);
+
+ debug_print("capa %d\n", result.error);
+
+ if (ok)
+ *ok = result.error;
+
+ return result.caps;
+
+}
struct disconnect_param {
mailimap * imap;
value.len = 0;
chash_delete(session_hash, &key, NULL);
+ key.data = &imap;
+ key.len = sizeof(imap);
+ chash_delete(courier_workaround_hash, &key, NULL);
+
mailimap_free(imap);
debug_print("disconnect ok\n");
mailimap * imap;
const char * login;
const char * password;
+ const char * type;
};
struct login_result {
struct login_param * param;
struct login_result * result;
int r;
+#ifdef DISABLE_LOG_DURING_LOGIN
+ int old_debug;
+#endif
param = op->param;
- r = mailimap_login(param->imap,
+
+#ifdef DISABLE_LOG_DURING_LOGIN
+ old_debug = mailstream_debug;
+ mailstream_debug = 0;
+#endif
+ if (!strcmp(param->type, "LOGIN"))
+ r = mailimap_login(param->imap,
param->login, param->password);
+ else
+ r = mailimap_authenticate(param->imap,
+ param->type, NULL, NULL, NULL,
+ param->login, param->login,
+ param->password, NULL);
+#ifdef DISABLE_LOG_DURING_LOGIN
+ mailstream_debug = old_debug;
+#endif
result = op->result;
result->error = r;
}
int imap_threaded_login(Folder * folder,
- const char * login, const char * password)
+ const char * login, const char * password,
+ const char * type)
{
struct login_param param;
struct login_result result;
param.imap = get_imap(folder);
param.login = login;
param.password = password;
-
+ param.type = type;
+
threaded_run(folder, ¶m, &result, login_run);
debug_print("imap login - end\n");
}
int imap_threaded_status(Folder * folder, const char * mb,
- struct mailimap_mailbox_data_status ** data_status)
+ struct mailimap_mailbox_data_status ** data_status,
+ guint mask)
{
struct status_param param;
struct status_result result;
debug_print("imap status - begin\n");
status_att_list = mailimap_status_att_list_new_empty();
- mailimap_status_att_list_add(status_att_list,
+ if (mask & 1 << 0) {
+ mailimap_status_att_list_add(status_att_list,
MAILIMAP_STATUS_ATT_MESSAGES);
- mailimap_status_att_list_add(status_att_list,
+ }
+ if (mask & 1 << 1) {
+ mailimap_status_att_list_add(status_att_list,
MAILIMAP_STATUS_ATT_RECENT);
- mailimap_status_att_list_add(status_att_list,
+ }
+ if (mask & 1 << 2) {
+ mailimap_status_att_list_add(status_att_list,
MAILIMAP_STATUS_ATT_UIDNEXT);
- mailimap_status_att_list_add(status_att_list,
+ }
+ if (mask & 1 << 3) {
+ mailimap_status_att_list_add(status_att_list,
MAILIMAP_STATUS_ATT_UIDVALIDITY);
- mailimap_status_att_list_add(status_att_list,
+ }
+ if (mask & 1 << 4) {
+ mailimap_status_att_list_add(status_att_list,
MAILIMAP_STATUS_ATT_UNSEEN);
-
+ }
param.imap = get_imap(folder);
param.mb = mb;
param.status_att_list = status_att_list;
* data_status = result.data_status;
+ mailimap_status_att_list_free(status_att_list);
+
return result.error;
}
}
-struct starttls_param {
- mailimap * imap;
-};
-
struct starttls_result {
int error;
};
static void starttls_run(struct etpan_thread_op * op)
{
- struct starttls_param * param;
+ struct connect_param * param;
struct starttls_result * result;
int r;
-
+
param = op->param;
r = mailimap_starttls(param->imap);
result = op->result;
result->error = r;
debug_print("imap starttls run - end %i\n", r);
+
+ if (r == 0) {
+ mailimap *imap = param->imap;
+ mailstream_low *plain_low = NULL;
+ mailstream_low *tls_low = NULL;
+ int fd = -1;
+
+ plain_low = mailstream_get_low(imap->imap_stream);
+ fd = mailstream_low_get_fd(plain_low);
+ if (fd == -1) {
+ debug_print("imap starttls run - can't get fd\n");
+ result->error = MAILIMAP_ERROR_STREAM;
+ return;
+ }
+
+ tls_low = mailstream_low_tls_open(fd);
+ if (tls_low == NULL) {
+ debug_print("imap starttls run - can't tls_open\n");
+ result->error = MAILIMAP_ERROR_STREAM;
+ return;
+ }
+ mailstream_low_free(plain_low);
+ mailstream_set_low(imap->imap_stream, tls_low);
+ }
}
-int imap_threaded_starttls(Folder * folder)
+int imap_threaded_starttls(Folder * folder, const gchar *host, int port)
{
- struct starttls_param param;
+ struct connect_param param;
struct starttls_result result;
+ int cert_len;
+ unsigned char *certificate;
debug_print("imap starttls - begin\n");
param.imap = get_imap(folder);
+ param.server = host;
+ param.port = port;
threaded_run(folder, ¶m, &result, starttls_run);
debug_print("imap starttls - end\n");
+ if (result.error == 0 && !etpan_skip_ssl_cert_check) {
+ cert_len = mailstream_ssl_get_certificate(param.imap->imap_stream, &certificate);
+ if (etpan_certificate_check(certificate, cert_len, ¶m) < 0)
+ result.error = MAILIMAP_ERROR_STREAM;
+ if (certificate)
+ free(certificate);
+ }
return result.error;
}
clist * search_result;
};
+static struct mailimap_set_item *sc_mailimap_set_item_copy(struct mailimap_set_item *orig)
+{
+ return mailimap_set_item_new(orig->set_first, orig->set_last);
+}
+
+static struct mailimap_set *sc_mailimap_set_copy(struct mailimap_set *orig)
+{
+ clist *list = orig ? orig->set_list : NULL;
+ clist *newlist = clist_new();
+ clistiter *cur;
+
+ if (!orig)
+ return NULL;
+ for (cur = clist_begin(list); cur; cur = clist_next(cur))
+ clist_append(newlist,
+ sc_mailimap_set_item_copy(
+ (struct mailimap_set_item *)clist_content(cur)));
+ return mailimap_set_new(newlist);
+}
+
static void search_run(struct etpan_thread_op * op)
{
struct search_param * param;
struct search_result * result;
int r;
- struct mailimap_search_key * key;
- struct mailimap_search_key * uid_key;
+ struct mailimap_search_key * key = NULL;
+ struct mailimap_search_key * uid_key = NULL;
struct mailimap_search_key * search_type_key;
clist * search_result;
param = op->param;
- uid_key = mailimap_search_key_new_uid(param->set);
+ if (param->set == NULL && param->type == IMAP_SEARCH_TYPE_SIMPLE) {
+ g_warning("broken search");
+ }
+
+ /* we copy the mailimap_set because freeing the key is recursive */
+ if (param->set != NULL)
+ uid_key = mailimap_search_key_new_uid(sc_mailimap_set_copy(param->set));
search_type_key = NULL;
switch (param->type) {
NULL, NULL, NULL, NULL, NULL,
NULL, 0, NULL, NULL, NULL);
break;
+ case IMAP_SEARCH_TYPE_DELETED:
+ search_type_key = mailimap_search_key_new(MAILIMAP_SEARCH_KEY_DELETED,
+ NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, 0,
+ NULL, NULL, NULL, NULL, NULL,
+ NULL, 0, NULL, NULL, NULL);
+ break;
}
if (search_type_key != NULL) {
- key = mailimap_search_key_new_multiple_empty();
- mailimap_search_key_multiple_add(key, search_type_key);
- mailimap_search_key_multiple_add(key, uid_key);
- }
- else {
+ if (param->set != NULL) {
+ key = mailimap_search_key_new_multiple_empty();
+ mailimap_search_key_multiple_add(key, search_type_key);
+ mailimap_search_key_multiple_add(key, uid_key);
+ } else {
+ key = search_type_key;
+ }
+ } else if (uid_key != NULL) {
key = uid_key;
}
- r = mailimap_uid_search(param->imap, NULL, key, &search_result);
-
- result = op->result;
- result->error = r;
- result->search_result = search_result;
- debug_print("imap search run - end %i\n", r);
+ if (key == NULL) {
+ g_warning("no key!");
+ result = op->result;
+ result->error = -1;
+ result->search_result = NULL;
+ } else {
+ r = mailimap_uid_search(param->imap, NULL, key, &search_result);
+
+ /* free the key (with the imapset) */
+ mailimap_search_key_free(key);
+
+ result = op->result;
+ result->error = r;
+ result->search_result = search_result;
+ }
+ debug_print("imap search run - end %i\n", result->error);
}
int imap_threaded_search(Folder * folder, int search_type,
mailimap * imap;
debug_print("imap search - begin\n");
-
+
imap = get_imap(folder);
param.imap = imap;
param.set = set;
param = op->param;
+ fetch_result = NULL;
r = imap_get_messages_list(param->imap, param->first_index,
&fetch_result);
goto free_fetch_att;
}
+ mailstream_logger = imap_logger_fetch;
+
r = mailimap_uid_fetch(imap, set,
fetch_type, &fetch_result);
+ mailstream_logger = imap_logger_cmd;
+
mailimap_fetch_type_free(fetch_type);
mailimap_set_free(set);
param = op->param;
+ content = NULL;
+ content_size = 0;
if (param->with_body)
r = imap_fetch(param->imap, param->msg_index,
&content, &content_size);
r = fclose(f);
if (r == EOF) {
- unlink(param->filename);
+ g_unlink(param->filename);
goto close;
}
goto free;
close:
close(fd);
unlink:
- unlink(param->filename);
+ g_unlink(param->filename);
free:
if (mmap_string_unref(content) != 0)
imap_get_msg_att_info(msg_att, &uid, &headers, &size,
&att_dyn);
+ if (!headers)
+ return NULL;
info = malloc(sizeof(* info));
info->uid = uid;
info->headers = strdup(headers);
clistiter * cur;
unsigned int i;
carray * env_list;
-
i = 0;
env_list = carray_new(16);
msg_att = clist_content(cur);
env_info = fetch_to_env_info(msg_att);
+ if (!env_info)
+ return MAILIMAP_ERROR_MEMORY;
carray_add(env_list, env_info, NULL);
}
return MAIL_NO_ERROR;
}
+int imap_add_header_fetch_att(struct mailimap_fetch_type * fetch_type)
+{
+ struct mailimap_fetch_att * fetch_att;
+ struct mailimap_section * section;
+
+ section = mailimap_section_new_header();
+ fetch_att = mailimap_fetch_att_new_body_peek_section(section);
+ mailimap_fetch_type_new_fetch_att_list_add(fetch_type, fetch_att);
+
+ return MAIL_NO_ERROR;
+}
+
static int
imap_get_envelopes_list(mailimap * imap, struct mailimap_set * set,
carray ** p_env_list)
int res;
clist * fetch_result;
int r;
- carray * env_list;
+ carray * env_list = NULL;
+ chashdatum key;
+ chashdatum value;
fetch_type = mailimap_fetch_type_new_fetch_att_list_empty();
r = mailimap_fetch_type_new_fetch_att_list_add(fetch_type, fetch_att);
/* headers */
- r = imap_add_envelope_fetch_att(fetch_type);
+ key.data = &imap;
+ key.len = sizeof(imap);
+ r = chash_get(courier_workaround_hash, &key, &value);
+ if (r < 0)
+ r = imap_add_envelope_fetch_att(fetch_type);
+ else
+ r = imap_add_header_fetch_att(fetch_type);
r = mailimap_uid_fetch(imap, set, fetch_type, &fetch_result);
break;
default:
mailimap_fetch_type_free(fetch_type);
+ debug_print("uid_fetch: %d\n", r);
return r;
}
if (clist_begin(fetch_result) == NULL) {
res = MAILIMAP_ERROR_FETCH;
+ debug_print("clist_begin = NULL\n");
goto err;
}
if (r != MAILIMAP_NO_ERROR) {
mailimap_fetch_type_free(fetch_type);
res = MAILIMAP_ERROR_MEMORY;
+ debug_print("fetch_result_to_envelop_list: %d\n", res);
goto err;
}
param = op->param;
+ env_list = NULL;
r = imap_get_envelopes_list(param->imap, param->set,
&env_list);
threaded_run(folder, ¶m, &result, fetch_env_run);
+ if (result.error != MAILIMAP_NO_ERROR) {
+ chashdatum key;
+ chashdatum value;
+ int r;
+
+ key.data = &imap;
+ key.len = sizeof(imap);
+ r = chash_get(courier_workaround_hash, &key, &value);
+ if (r < 0) {
+ value.data = NULL;
+ value.len = 0;
+ chash_set(courier_workaround_hash, &key, &value, NULL);
+
+ threaded_run(folder, ¶m, &result, fetch_env_run);
+ }
+ }
+
if (result.error != MAILIMAP_NO_ERROR)
return result.error;
struct append_result {
int error;
+ int uid;
};
static void append_run(struct etpan_thread_op * op)
char * data;
size_t size;
struct stat stat_buf;
- int fd;
+ int fd, uid = 0;
param = op->param;
result = op->result;
return;
}
+ mailstream_logger = imap_logger_append;
+
r = mailimap_append(param->imap, param->mailbox,
param->flag_list, NULL,
- data, size);
+ data, size/*, &uid */);
+
+ mailstream_logger = imap_logger_cmd;
munmap(data, size);
close(fd);
result->error = r;
-
- debug_print("imap append run - end %i\n", r);
+ result->uid = uid;
+ debug_print("imap append run - end %i uid %d\n", r, uid);
}
int imap_threaded_append(Folder * folder, const char * mailbox,
const char * filename,
- struct mailimap_flag_list * flag_list)
+ struct mailimap_flag_list * flag_list,
+ int *uid)
{
struct append_param param;
struct append_result result;
return result.error;
debug_print("imap append - end\n");
-
+ if (uid != NULL)
+ *uid = result.uid;
+
return result.error;
}
}
+#define ENV_BUFFER_SIZE 512
static void do_exec_command(int fd, const char * command,
const char * servername, uint16_t port)
{
int i, maxopen;
-
+#ifdef SOLARIS
+ char env_buffer[ENV_BUFFER_SIZE];
+#endif
+
if (fork() > 0) {
/* Fork again to become a child of init rather than
the etpan client. */
exit(0);
}
+#ifdef SOLARIS
+ if (servername)
+ snprintf(env_buffer, ENV_BUFFER_SIZE,
+ "ETPANSERVER=%s", servername);
+ else
+ snprintf(env_buffer, ENV_BUFFER_SIZE, "ETPANSERVER=");
+ putenv(env_buffer);
+#else
if (servername)
setenv("ETPANSERVER", servername, 1);
else
unsetenv("ETPANSERVER");
+#endif
+#ifdef SOLARIS
+ if (port)
+ snprintf(env_buffer, ENV_BUFFER_SIZE, "ETPANPORT=%d", port);
+ else
+ snprintf(env_buffer, ENV_BUFFER_SIZE, "ETPANPORT=");
+ putenv(env_buffer);
+#else
if (port) {
char porttext[20];
-
+
snprintf(porttext, sizeof(porttext), "%d", port);
setenv("ETPANPORT", porttext, 1);
}
else {
unsetenv("ETPANPORT");
}
-
+#endif
+
/* Not a lot we can do if there's an error other than bail. */
if (dup2(fd, 0) == -1)
exit(1);
}
r = mailimap_connect(imap, s);
- if (r != MAILIMAP_NO_ERROR) {
+ if (r != MAILIMAP_NO_ERROR_AUTHENTICATED
+ && r != MAILIMAP_NO_ERROR_NON_AUTHENTICATED) {
mailstream_close(s);
return r;
}
- return MAILIMAP_NO_ERROR;
+ return r;
}
/* connect cmd */
projects / claws.git / blobdiff