mirror of
https://github.com/rkd77/elinks.git
synced 2024-08-26 21:54:50 -04:00
320 lines
8.2 KiB
C
320 lines
8.2 KiB
C
/* Protocol implementation manager. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "elinks.h"
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#include "bfu/dialog.h"
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#include "document/view.h"
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#include "ecmascript/ecmascript.h"
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#include "intl/gettext/libintl.h"
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#include "main/module.h"
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#include "network/connection.h"
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#include "protocol/protocol.h"
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#include "protocol/uri.h"
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#include "session/session.h"
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#include "terminal/terminal.h"
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#include "terminal/window.h"
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#include "util/memory.h"
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#include "util/string.h"
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/* Backends dynamic area: */
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#include "protocol/about.h"
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#include "protocol/auth/auth.h"
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#include "protocol/bittorrent/bittorrent.h"
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#include "protocol/bittorrent/connection.h"
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#include "protocol/data.h"
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#include "protocol/file/cgi.h"
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#include "protocol/file/file.h"
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#include "protocol/finger/finger.h"
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#include "protocol/fsp/fsp.h"
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#include "protocol/ftp/ftp.h"
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#include "protocol/gopher/gopher.h"
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#include "protocol/http/http.h"
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#include "protocol/nntp/connection.h"
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#include "protocol/nntp/nntp.h"
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#include "protocol/rewrite/rewrite.h"
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#include "protocol/smb/smb.h"
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#include "protocol/user.h"
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struct protocol_backend {
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unsigned char *name;
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int port;
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protocol_handler_T *handler;
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unsigned int need_slashes:1;
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unsigned int need_slash_after_host:1;
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unsigned int free_syntax:1;
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unsigned int need_ssl:1;
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};
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static const struct protocol_backend protocol_backends[] = {
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{ "about", 0, about_protocol_handler, 0, 0, 1, 0 },
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{ "bittorrent", 0, bittorrent_protocol_handler, 0, 0, 1, 0 },
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{ "data", 0, data_protocol_handler, 0, 0, 1, 0 },
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{ "file", 0, file_protocol_handler, 1, 0, 0, 0 },
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{ "finger", 79, finger_protocol_handler, 1, 1, 0, 0 },
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{ "fsp", 21, fsp_protocol_handler, 1, 1, 0, 0 },
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{ "ftp", 21, ftp_protocol_handler, 1, 1, 0, 0 },
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{ "gopher", 70, gopher_protocol_handler, 1, 1, 0, 0 },
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{ "http", 80, http_protocol_handler, 1, 1, 0, 0 },
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{ "https", 443, https_protocol_handler, 1, 1, 0, 1 },
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{ "javascript", 0, NULL, 0, 0, 1, 0 },
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{ "news", 0, news_protocol_handler, 0, 0, 1, 0 },
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{ "nntp", 119, nntp_protocol_handler, 1, 1, 0, 0 },
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{ "nntps", 563, nntp_protocol_handler, 1, 1, 0, 1 },
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{ "proxy", 3128, proxy_protocol_handler, 1, 1, 0, 0 },
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{ "smb", 139, smb_protocol_handler, 1, 1, 0, 0 },
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{ "snews", 0, news_protocol_handler, 0, 0, 1, 0 },
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/* Keep these last! */
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{ NULL, 0, NULL, 0, 0, 1, 0 },
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{ "user", 0, NULL, 0, 0, 0, 0 },
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/* Internal protocol for mapping to protocol.user.* handlers. Placed
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* last because it's checked first and else should be ignored. */
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{ "custom", 0, NULL, 0, 0, 1, 0 },
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};
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/* This function gets called quite a lot these days. With incremental rendering
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* and all I counted 4400 calls alone when loading fm. With the old linear
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* comparison this would lead to 30800 comparison against protocol names. The
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* binary search used currently reduces it to 4400 (meaning fm only has HTTP
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* links). */
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enum protocol
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get_protocol(unsigned char *name, int namelen)
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{
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/* These are really enum protocol values but can take on negative
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* values and since 0 <= -1 for enum values it's better to use clean
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* integer type. */
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int start, end;
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enum protocol protocol;
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/* Almost dichotomic search is used here */
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/* Starting at the HTTP entry which is the most common that will make
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* file and NNTP the next entries checked and amongst the third checks
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* are proxy and FTP. */
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start = 0;
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end = PROTOCOL_UNKNOWN - 1;
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protocol = PROTOCOL_HTTP;
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assert(start <= protocol && protocol <= end);
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while (start <= end) {
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unsigned char *pname = protocol_backends[protocol].name;
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int pnamelen = strlen(pname);
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int minlen = int_min(pnamelen, namelen);
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int compare = strncasecmp(pname, name, minlen);
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if (compare == 0) {
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if (pnamelen == namelen)
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return protocol;
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/* If the current protocol name is longer than the
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* protocol name being searched for move @end else move
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* @start. */
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compare = pnamelen > namelen ? 1 : -1;
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}
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if (compare > 0)
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end = protocol - 1;
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else
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start = protocol + 1;
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protocol = (start + end) / 2;
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}
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/* Custom (protocol.user) protocol has higher precedence than builtin
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* handlers, but we will check for it when following a link.
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* Calling get_user_program for every link is too expensive. --witekfl */
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/* TODO: In order to fully give higher precedence to user chosen
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* protocols we have to get some terminal to pass along. */
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if (get_user_program(NULL, name, namelen))
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return PROTOCOL_USER;
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return PROTOCOL_UNKNOWN;
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}
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#define VALID_PROTOCOL(p) (0 <= (p) && (p) < PROTOCOL_BACKENDS)
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int
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get_protocol_port(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return 0;
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assert(uri_port_is_valid(protocol_backends[protocol].port));
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if_assert_failed return 0;
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return protocol_backends[protocol].port;
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}
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int
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get_protocol_need_slashes(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return 0;
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return protocol_backends[protocol].need_slashes;
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}
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int
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get_protocol_need_slash_after_host(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return 0;
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return protocol_backends[protocol].need_slash_after_host;
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}
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int
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get_protocol_free_syntax(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return 0;
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return protocol_backends[protocol].free_syntax;
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}
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int
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get_protocol_need_ssl(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return 0;
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return protocol_backends[protocol].need_ssl;
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}
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protocol_handler_T *
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get_protocol_handler(enum protocol protocol)
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{
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assert(VALID_PROTOCOL(protocol));
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if_assert_failed return NULL;
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return protocol_backends[protocol].handler;
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}
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static void
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generic_external_protocol_handler(struct session *ses, struct uri *uri)
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{
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/* [gettext_accelerator_context(generic_external_protocol_handler)] */
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enum connection_state state;
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switch (uri->protocol) {
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case PROTOCOL_JAVASCRIPT:
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#ifdef CONFIG_ECMASCRIPT
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ecmascript_protocol_handler(ses, uri);
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return;
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#else
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state = S_NO_JAVASCRIPT;
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#endif
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break;
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case PROTOCOL_UNKNOWN:
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state = S_UNKNOWN_PROTOCOL;
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break;
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default:
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#ifndef CONFIG_SSL
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if (get_protocol_need_ssl(uri->protocol)) {
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state = S_SSL_ERROR;
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break;
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}
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#endif
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msg_box(ses->tab->term, NULL, MSGBOX_FREE_TEXT,
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N_("Error"), ALIGN_CENTER,
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msg_text(ses->tab->term,
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N_("This version of ELinks does not contain "
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"%s protocol support"),
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protocol_backends[uri->protocol].name),
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ses, 1,
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N_("~OK"), NULL, B_ENTER | B_ESC);
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return;
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}
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print_error_dialog(ses, state, uri, PRI_CANCEL);
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}
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protocol_external_handler_T *
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get_protocol_external_handler(struct terminal *term, struct uri *uri)
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{
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unsigned char *prog;
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assert(uri && VALID_PROTOCOL(uri->protocol));
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if_assert_failed return NULL;
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prog = get_user_program(term, struri(uri), uri->protocollen);
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if (prog && *prog)
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return user_protocol_handler;
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if (!protocol_backends[uri->protocol].handler)
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return generic_external_protocol_handler;
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return NULL;
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}
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static struct option_info protocol_options[] = {
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INIT_OPT_TREE("", N_("Protocols"),
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"protocol", OPT_SORT,
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N_("Protocol specific options.")),
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INIT_OPT_STRING("protocol", N_("No-proxy domains"),
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"no_proxy", 0, "",
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N_("Comma separated list of domains for which the proxy (HTTP/FTP)\n"
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"should be disabled. Optionally, a port can be specified for some\n"
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"domains as well. If it's blank, NO_PROXY environment variable is\n"
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"checked as well.")),
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NULL_OPTION_INFO,
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};
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static struct module *protocol_submodules[] = {
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&auth_module,
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#ifdef CONFIG_BITTORRENT
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&bittorrent_protocol_module,
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#endif
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&file_protocol_module,
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#ifdef CONFIG_CGI
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&cgi_protocol_module,
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#endif
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#ifdef CONFIG_FINGER
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&finger_protocol_module,
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#endif
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#ifdef CONFIG_FSP
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&fsp_protocol_module,
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#endif
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#ifdef CONFIG_FTP
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&ftp_protocol_module,
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#endif
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#ifdef CONFIG_GOPHER
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&gopher_protocol_module,
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#endif
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&http_protocol_module,
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#ifdef CONFIG_NNTP
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&nntp_protocol_module,
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#endif
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#ifdef CONFIG_SMB
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&smb_protocol_module,
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#endif
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#ifdef CONFIG_URI_REWRITE
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&uri_rewrite_module,
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#endif
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&user_protocol_module,
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NULL,
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};
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struct module protocol_module = struct_module(
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/* name: */ N_("Protocol"),
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/* options: */ protocol_options,
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/* hooks: */ NULL,
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/* submodules: */ protocol_submodules,
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/* data: */ NULL,
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/* init: */ NULL,
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/* done: */ NULL
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);
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