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elinks/src/protocol/protocol.c

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/* Protocol implementation manager. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "elinks.h"
#include "bfu/dialog.h"
#include "document/view.h"
#include "ecmascript/ecmascript.h"
#include "intl/gettext/libintl.h"
#include "main/module.h"
#include "network/connection.h"
#include "protocol/protocol.h"
#include "protocol/uri.h"
#include "session/session.h"
#include "terminal/terminal.h"
#include "terminal/window.h"
#include "util/memory.h"
#include "util/string.h"
/* Backends dynamic area: */
#include "protocol/about.h"
#include "protocol/bittorrent/bittorrent.h"
#include "protocol/bittorrent/connection.h"
#include "protocol/data.h"
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#include "protocol/file/cgi.h"
#include "protocol/file/file.h"
#include "protocol/finger/finger.h"
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#include "protocol/fsp/fsp.h"
#include "protocol/ftp/ftp.h"
#include "protocol/gopher/gopher.h"
#include "protocol/http/http.h"
#include "protocol/nntp/connection.h"
#include "protocol/nntp/nntp.h"
#include "protocol/rewrite/rewrite.h"
#include "protocol/smb/smb.h"
#include "protocol/user.h"
struct protocol_backend {
unsigned char *name;
int port;
protocol_handler_T *handler;
unsigned int need_slashes:1;
unsigned int need_slash_after_host:1;
unsigned int free_syntax:1;
unsigned int need_ssl:1;
};
static const struct protocol_backend protocol_backends[] = {
{ "about", 0, about_protocol_handler, 0, 0, 1, 0 },
{ "bittorrent", 0, bittorrent_protocol_handler, 0, 0, 1, 0 },
{ "data", 0, data_protocol_handler, 0, 0, 1, 0 },
{ "file", 0, file_protocol_handler, 1, 0, 0, 0 },
{ "finger", 79, finger_protocol_handler, 1, 1, 0, 0 },
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{ "fsp", 21, fsp_protocol_handler, 1, 1, 0, 0 },
{ "ftp", 21, ftp_protocol_handler, 1, 1, 0, 0 },
{ "gopher", 70, gopher_protocol_handler, 1, 1, 0, 0 },
{ "http", 80, http_protocol_handler, 1, 1, 0, 0 },
{ "https", 443, https_protocol_handler, 1, 1, 0, 1 },
{ "javascript", 0, NULL, 0, 0, 1, 0 },
{ "news", 0, news_protocol_handler, 0, 0, 1, 0 },
{ "nntp", 119, nntp_protocol_handler, 1, 1, 0, 0 },
{ "nntps", 563, nntp_protocol_handler, 1, 1, 0, 1 },
{ "proxy", 3128, proxy_protocol_handler, 1, 1, 0, 0 },
{ "smb", 139, smb_protocol_handler, 1, 1, 0, 0 },
{ "snews", 0, news_protocol_handler, 0, 0, 1, 0 },
/* Keep these last! */
{ NULL, 0, NULL, 0, 0, 1, 0 },
{ "user", 0, NULL, 0, 0, 0, 0 },
/* Internal protocol for mapping to protocol.user.* handlers. Placed
* last because it's checked first and else should be ignored. */
{ "custom", 0, NULL, 0, 0, 1, 0 },
};
/* This function gets called quite a lot these days. With incremental rendering
* and all I counted 4400 calls alone when loading fm. With the old linear
* comparison this would lead to 30800 comparison against protocol names. The
* binary search used currently reduces it to 4400 (meaning fm only has HTTP
* links). */
enum protocol
get_protocol(unsigned char *name, int namelen)
{
/* These are really enum protocol values but can take on negative
* values and since 0 <= -1 for enum values it's better to use clean
* integer type. */
int start, end;
enum protocol protocol;
/* Almost dichotomic search is used here */
/* Starting at the HTTP entry which is the most common that will make
* file and NNTP the next entries checked and amongst the third checks
* are proxy and FTP. */
start = 0;
end = PROTOCOL_UNKNOWN - 1;
protocol = PROTOCOL_HTTP;
assert(start <= protocol && protocol <= end);
while (start <= end) {
unsigned char *pname = protocol_backends[protocol].name;
int pnamelen = strlen(pname);
int minlen = int_min(pnamelen, namelen);
int compare = strncasecmp(pname, name, minlen);
if (compare == 0) {
if (pnamelen == namelen)
return protocol;
/* If the current protocol name is longer than the
* protocol name being searched for move @end else move
* @start. */
compare = pnamelen > namelen ? 1 : -1;
}
if (compare > 0)
end = protocol - 1;
else
start = protocol + 1;
protocol = (start + end) / 2;
}
/* Custom (protocol.user) protocol has higher precedence than builtin
* handlers, but we will check for it when following a link.
* Calling get_user_program for every link is too expensive. --witekfl */
/* TODO: In order to fully give higher precedence to user chosen
* protocols we have to get some terminal to pass along. */
if (get_user_program(NULL, name, namelen))
return PROTOCOL_USER;
return PROTOCOL_UNKNOWN;
}
#define VALID_PROTOCOL(p) (0 <= (p) && (p) < PROTOCOL_BACKENDS)
int
get_protocol_port(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return 0;
assert(uri_port_is_valid(protocol_backends[protocol].port));
if_assert_failed return 0;
return protocol_backends[protocol].port;
}
int
get_protocol_need_slashes(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return 0;
return protocol_backends[protocol].need_slashes;
}
int
get_protocol_need_slash_after_host(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return 0;
return protocol_backends[protocol].need_slash_after_host;
}
int
get_protocol_free_syntax(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return 0;
return protocol_backends[protocol].free_syntax;
}
int
get_protocol_need_ssl(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return 0;
return protocol_backends[protocol].need_ssl;
}
protocol_handler_T *
get_protocol_handler(enum protocol protocol)
{
assert(VALID_PROTOCOL(protocol));
if_assert_failed return NULL;
return protocol_backends[protocol].handler;
}
static void
generic_external_protocol_handler(struct session *ses, struct uri *uri)
{
Here is a framework that detects cases where a PO file assigns the same accelerator key to multiple buttons in a dialog box or to multiple items in a menu. ELinks already has some support for this but it requires the translator to run ELinks and manually scan through all menus and dialogs. The attached changes make it possible to quickly detect and list any conflicts, including ones that can only occur on operating systems or configurations that the translator is not currently using. The changes have no immediate effect on the elinks executable or the MO files. PO files become larger, however. The scheme works like this: - Like before, accelerator keys in translatable strings are tagged with the tilde (~) character. - Whenever a C source file defines an accelerator key, it must assign one or more named "contexts" to it. The translations in the PO files inherit these contexts. If multiple strings use the same accelerator (case insensitive) in the same context, that's a conflict and can be detected automatically. - The contexts are defined with "gettext_accelerator_context" comments in source files. These comments delimit regions where all translatable strings containing tildes are given the same contexts. There must be one special comment at the top of the region; it lists the contexts assigned to that region. The region automatically ends at the end of the function (found with regexp /^\}/), but it can also be closed explicitly with another special comment. The comments are formatted like this: /* [gettext_accelerator_context(foo, bar, baz)] begins a region that uses the contexts "foo", "bar", and "baz". The comma is the delimiter; whitespace is optional. [gettext_accelerator_context()] ends the region. */ The scripts don't currently check whether this syntax occurs inside or outside comments. - The names of contexts consist of C identifiers delimited with periods. I typically used the name of a function that sets up a dialog, or the name of an array where the items of a menu are listed. There is a special feature for static functions: if the name begins with a period, then the period will be replaced with the name of the source file and a colon. - If a menu is programmatically generated from multiple parts, of which some are never used together, so that it is safe to use the same accelerators in them, then it is necessary to define multiple contexts for the same menu. link_menu() in src/viewer/text/link.c is the most complex example of this. - During make update-po: - A Perl script (po/gather-accelerator-contexts.pl) reads po/elinks.pot, scans the source files listed in it for "gettext_accelerator_context" comments, and rewrites po/elinks.pot with "accelerator_context" comments that indicate the contexts of each msgid: the union of all contexts of all of its uses in the source files. It also removes any "gettext_accelerator_context" comments that xgettext --add-comments has copied to elinks.pot. - If po/gather-accelerator-contexts.pl does not find any contexts for some use of an msgid that seems to contain an accelerator (because it contains a tilde), it warns. If the tilde refers to e.g. "~/.elinks" and does not actually mark an accelerator, the warning can be silenced by specifying the special context "IGNORE", which the script otherwise ignores. - msgmerge copies the "accelerator_context" comments from po/elinks.pot to po/*.po. Translators do not edit those comments. - During make check-po: - Another Perl script (po/check-accelerator-contexts.pl) reads po/*.po and keeps track of which accelerators have been bound in each context. It warns about any conflicts it finds. This script does not access the C source files; thus it does not matter if the line numbers in "#:" lines are out of date. This implementation is not perfect and I am not proposing to add it to the main source tree at this time. Specifically: - It introduces compile-time dependencies on Perl and Locale::PO. There should be a configure-time or compile-time check so that the new features are skipped if the prerequisites are missing. - When the scripts include msgstr strings in warnings, they should transcode them from the charset of the PO file to the one specified by the user's locale. - It is not adequately documented (well, except perhaps here). - po/check-accelerator-contexts.pl reports the same conflict multiple times if it occurs in multiple contexts. - The warning messages should include line numbers, so that users of Emacs could conveniently edit the conflicting part of the PO file. This is not feasible with the current version of Locale::PO. - Locale::PO does not understand #~ lines and spews warnings about them. There is an ugly hack to hide these warnings. - Jonas Fonseca suggested the script could propose accelerators that are still available. This has not been implemented. There are three files attached: - po/gather-accelerator-contexts.pl: Augments elinks.pot with context information. - po/check-accelerator-contexts.pl: Checks conflicts. - accelerator-contexts.diff: Makes po/Makefile run the scripts, and adds special comments to source files.
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/* [gettext_accelerator_context(generic_external_protocol_handler)] */
enum connection_state state;
switch (uri->protocol) {
case PROTOCOL_JAVASCRIPT:
#ifdef CONFIG_ECMASCRIPT
ecmascript_protocol_handler(ses, uri);
return;
#else
state = S_NO_JAVASCRIPT;
#endif
break;
case PROTOCOL_UNKNOWN:
state = S_UNKNOWN_PROTOCOL;
break;
default:
#ifndef CONFIG_SSL
if (get_protocol_need_ssl(uri->protocol)) {
state = S_SSL_ERROR;
break;
}
#endif
msg_box(ses->tab->term, NULL, MSGBOX_FREE_TEXT,
N_("Error"), ALIGN_CENTER,
msg_text(ses->tab->term,
N_("This version of ELinks does not contain "
"%s protocol support"),
protocol_backends[uri->protocol].name),
ses, 1,
N_("~OK"), NULL, B_ENTER | B_ESC);
return;
}
print_error_dialog(ses, state, uri, PRI_CANCEL);
}
protocol_external_handler_T *
get_protocol_external_handler(struct terminal *term, struct uri *uri)
{
unsigned char *prog;
assert(uri && VALID_PROTOCOL(uri->protocol));
if_assert_failed return NULL;
prog = get_user_program(term, struri(uri), uri->protocollen);
if (prog && *prog)
return user_protocol_handler;
if (!protocol_backends[uri->protocol].handler)
return generic_external_protocol_handler;
return NULL;
}
static struct option_info protocol_options[] = {
INIT_OPT_TREE("", N_("Protocols"),
"protocol", OPT_SORT,
N_("Protocol specific options.")),
INIT_OPT_STRING("protocol", N_("No-proxy domains"),
"no_proxy", 0, "",
N_("Comma separated list of domains for which the proxy (HTTP/FTP)\n"
"should be disabled. Optionally, a port can be specified for some\n"
"domains as well. If it's blank, NO_PROXY environment variable is\n"
"checked as well.")),
NULL_OPTION_INFO,
};
static struct module *protocol_submodules[] = {
#ifdef CONFIG_BITTORRENT
&bittorrent_protocol_module,
#endif
&file_protocol_module,
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#ifdef CONFIG_CGI
&cgi_protocol_module,
#endif
#ifdef CONFIG_FINGER
&finger_protocol_module,
#endif
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#ifdef CONFIG_FSP
&fsp_protocol_module,
#endif
#ifdef CONFIG_FTP
&ftp_protocol_module,
#endif
#ifdef CONFIG_GOPHER
&gopher_protocol_module,
#endif
&http_protocol_module,
#ifdef CONFIG_NNTP
&nntp_protocol_module,
#endif
#ifdef CONFIG_SMB
&smb_protocol_module,
#endif
#ifdef CONFIG_URI_REWRITE
&uri_rewrite_module,
#endif
&user_protocol_module,
NULL,
};
struct module protocol_module = struct_module(
/* name: */ N_("Protocol"),
/* options: */ protocol_options,
/* hooks: */ NULL,
/* submodules: */ protocol_submodules,
/* data: */ NULL,
/* init: */ NULL,
/* done: */ NULL
);