433 lines
10 KiB
C
433 lines
10 KiB
C
/*
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* Copyright 2011 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf.
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* about: URL handling. Based on the data fetcher by Rob Kendrick */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <string.h>
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#include <strings.h>
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#include <time.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <limits.h>
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#include <stdarg.h>
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#include "utils/config.h"
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#include "content/dirlist.h"
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#include "content/fetch.h"
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#include "content/fetchers/about.h"
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#include "content/urldb.h"
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#include "desktop/netsurf.h"
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#include "desktop/options.h"
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#include "utils/log.h"
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#include "utils/messages.h"
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#include "utils/url.h"
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#include "utils/utils.h"
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#include "utils/ring.h"
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struct fetch_about_context;
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typedef bool (*fetch_about_handler)(struct fetch_about_context *);
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/** Context for an about fetch */
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struct fetch_about_context {
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struct fetch_about_context *r_next, *r_prev;
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struct fetch *fetchh; /**< Handle for this fetch */
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bool aborted; /**< Flag indicating fetch has been aborted */
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bool locked; /**< Flag indicating entry is already entered */
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char *url; /**< The full url the fetch refers to */
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fetch_about_handler handler;
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};
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static struct fetch_about_context *ring = NULL;
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/** issue fetch callbacks with locking */
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static inline bool fetch_about_send_callback(fetch_msg msg,
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struct fetch_about_context *ctx, const void *data,
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unsigned long size, fetch_error_code errorcode)
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{
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ctx->locked = true;
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fetch_send_callback(msg, ctx->fetchh, data, size, errorcode);
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ctx->locked = false;
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return ctx->aborted;
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}
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static bool fetch_about_send_header(struct fetch_about_context *ctx,
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const char *fmt, ...)
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{
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char header[64];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(header, sizeof header, fmt, ap);
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va_end(ap);
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fetch_about_send_callback(FETCH_HEADER, ctx, header, strlen(header),
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FETCH_ERROR_NO_ERROR);
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return ctx->aborted;
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}
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static bool fetch_about_blank_handler(struct fetch_about_context *ctx)
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{
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char buffer[2];
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int code = 200;
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/* content is going to return ok */
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fetch_set_http_code(ctx->fetchh, code);
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/* content type */
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if (fetch_about_send_header(ctx, "Content-Type: text/html"))
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goto fetch_about_blank_handler_aborted;
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buffer[0] = ' ';
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buffer[1] = 0;
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, strlen(buffer),
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FETCH_ERROR_NO_ERROR))
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goto fetch_about_blank_handler_aborted;
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fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
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FETCH_ERROR_NO_ERROR);
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return true;
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fetch_about_blank_handler_aborted:
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return false;
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}
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static const char *authors[] = {
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"John-Mark Bell", "James Bursa", "Michael Drake",
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"Rob Kendrick", "Adrian Lees", "Vincent Sanders",
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"Daniel Silverstone", "Richard Wilson", NULL
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};
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static bool fetch_about_credits_handler(struct fetch_about_context *ctx)
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{
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char buffer[4096];
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int code = 200;
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int slen;
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int auth_loop = 0;
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/* content is going to return ok */
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fetch_set_http_code(ctx->fetchh, code);
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/* content type */
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if (fetch_about_send_header(ctx, "Content-Type: text/html"))
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goto fetch_about_credits_handler_aborted;
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slen = snprintf(buffer, sizeof buffer,
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"<html><head><title>NetSurf Browser Credits</title></head>"
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"<body><h1>NetSurf Browser Credits</h1>"
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"<p>Authors</p>"
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"<ul>");
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while (authors[auth_loop] != NULL) {
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slen += snprintf(buffer + slen, sizeof buffer - slen,
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"<li>%s</li>", authors[auth_loop]);
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auth_loop++;
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}
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slen += snprintf(buffer + slen, sizeof buffer - slen,
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"</ul></body></html>");
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, slen,
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FETCH_ERROR_NO_ERROR))
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goto fetch_about_credits_handler_aborted;
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fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
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FETCH_ERROR_NO_ERROR);
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return true;
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fetch_about_credits_handler_aborted:
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return false;
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}
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static bool fetch_about_config_handler(struct fetch_about_context *ctx)
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{
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char buffer[1024];
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int code = 200;
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int slen;
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unsigned int opt_loop = 0;
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int res = 0;
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/* content is going to return ok */
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fetch_set_http_code(ctx->fetchh, code);
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/* content type */
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if (fetch_about_send_header(ctx, "Content-Type: text/html"))
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goto fetch_about_config_handler_aborted;
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slen = snprintf(buffer, sizeof buffer,
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"<html><head><title>NetSurf Browser Config</title>"
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"<style type=\"text/css\">"
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".null-content { font-style: italic }"
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"</style></head>"
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"<body><h1>NetSurf Browser Config</h1>"
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"<table><tr><th></th><th></th><th></th></tr>");
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do {
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res = options_snoptionf(buffer + slen, sizeof buffer - slen,
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opt_loop,
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"<tr><td>%k</td><td>%t</td><td>%V</td></tr>");
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if (res <= 0)
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break; /* last option */
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if (res >= (int) (sizeof buffer - slen)) {
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/* last entry would not fit in buffer, submit buffer */
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer,
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slen, FETCH_ERROR_NO_ERROR))
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goto fetch_about_config_handler_aborted;
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slen = 0;
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} else {
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/* normal addition */
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slen += res;
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opt_loop++;
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}
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} while (res > 0);
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slen += snprintf(buffer + slen, sizeof buffer - slen,
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"</table></body></html>");
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, slen,
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FETCH_ERROR_NO_ERROR))
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goto fetch_about_config_handler_aborted;
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fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
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FETCH_ERROR_NO_ERROR);
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return true;
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fetch_about_config_handler_aborted:
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return false;
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}
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/** Generate the text of a Choices file which represents the current
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* in use options.
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*/
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static bool fetch_about_choices_handler(struct fetch_about_context *ctx)
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{
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char buffer[1024];
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int code = 200;
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int slen;
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unsigned int opt_loop = 0;
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int res = 0;
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/* content is going to return ok */
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fetch_set_http_code(ctx->fetchh, code);
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/* content type */
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if (fetch_about_send_header(ctx, "Content-Type: text/plain"))
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goto fetch_about_choices_handler_aborted;
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slen = snprintf(buffer, sizeof buffer,
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"# Automatically generated current NetSurf browser Choices\n");
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do {
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res = options_snoptionf(buffer + slen,
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sizeof buffer - slen,
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opt_loop,
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"%k:%v\n");
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if (res <= 0)
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break; /* last option */
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if (res >= (int) (sizeof buffer - slen)) {
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/* last entry would not fit in buffer, submit buffer */
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer,
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slen, FETCH_ERROR_NO_ERROR))
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goto fetch_about_choices_handler_aborted;
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slen = 0;
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} else {
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/* normal addition */
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slen += res;
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opt_loop++;
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}
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} while (res > 0);
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if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, slen,
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FETCH_ERROR_NO_ERROR))
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goto fetch_about_choices_handler_aborted;
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fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
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FETCH_ERROR_NO_ERROR);
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return true;
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fetch_about_choices_handler_aborted:
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return false;
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}
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struct about_handlers {
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const char *name;
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fetch_about_handler handler;
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};
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struct about_handlers about_handler_list[] = {
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{ "credits", fetch_about_credits_handler },
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{ "config", fetch_about_config_handler },
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{ "Choices", fetch_about_choices_handler },
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{ "blank", fetch_about_blank_handler } /* The default */
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};
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#define about_handler_list_len (sizeof(about_handler_list) / sizeof(struct about_handlers))
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/** callback to initialise the about fetcher. */
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static bool fetch_about_initialise(const char *scheme)
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{
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return true;
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}
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/** callback to initialise the about fetcher. */
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static void fetch_about_finalise(const char *scheme)
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{
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}
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/** callback to set up a about fetch context. */
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static void *
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fetch_about_setup(struct fetch *fetchh,
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const char *url,
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bool only_2xx,
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const char *post_urlenc,
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const struct fetch_multipart_data *post_multipart,
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const char **headers)
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{
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struct fetch_about_context *ctx;
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unsigned int handler_loop;
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struct url_components urlcomp;
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ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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url_get_components(url, &urlcomp);
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for (handler_loop = 0;
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handler_loop < about_handler_list_len;
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handler_loop++) {
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ctx->handler = about_handler_list[handler_loop].handler;
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if (strcmp(about_handler_list[handler_loop].name, urlcomp.path) == 0)
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break;
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}
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url_destroy_components(&urlcomp);
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ctx->fetchh = fetchh;
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RING_INSERT(ring, ctx);
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return ctx;
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}
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/** callback to free a about fetch */
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static void fetch_about_free(void *ctx)
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{
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struct fetch_about_context *c = ctx;
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free(c->url);
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RING_REMOVE(ring, c);
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free(ctx);
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}
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/** callback to start a about fetch */
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static bool fetch_about_start(void *ctx)
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{
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return true;
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}
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/** callback to abort a about fetch */
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static void fetch_about_abort(void *ctx)
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{
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struct fetch_about_context *c = ctx;
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/* To avoid the poll loop having to deal with the fetch context
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* disappearing from under it, we simply flag the abort here.
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* The poll loop itself will perform the appropriate cleanup.
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*/
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c->aborted = true;
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}
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/** callback to poll for additional about fetch contents */
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static void fetch_about_poll(const char *scheme)
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{
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struct fetch_about_context *c, *next;
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if (ring == NULL) return;
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/* Iterate over ring, processing each pending fetch */
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c = ring;
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do {
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/* Take a copy of the next pointer as we may destroy
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* the ring item we're currently processing */
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next = c->r_next;
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/* Ignore fetches that have been flagged as locked.
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* This allows safe re-entrant calls to this function.
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* Re-entrancy can occur if, as a result of a callback,
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* the interested party causes fetch_poll() to be called
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* again.
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*/
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if (c->locked == true) {
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continue;
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}
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/* Only process non-aborted fetches */
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if (c->aborted == false) {
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/* about fetches can be processed in one go */
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c->handler(c);
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}
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fetch_remove_from_queues(c->fetchh);
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fetch_free(c->fetchh);
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/* Advance to next ring entry, exiting if we've reached
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* the start of the ring or the ring has become empty
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*/
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} while ( (c = next) != ring && ring != NULL);
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}
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void fetch_about_register(void)
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{
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fetch_add_fetcher("about",
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fetch_about_initialise,
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fetch_about_setup,
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fetch_about_start,
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fetch_about_abort,
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fetch_about_free,
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fetch_about_poll,
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fetch_about_finalise);
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}
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