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-rw-r--r--src/html-error.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/src/html-error.c b/src/html-error.c
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+++ b/src/html-error.c
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+/* tinyproxy - A fast light-weight HTTP proxy
+ * Copyright (C) 2003 Steven Young <sdyoung@miranda.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* This file contains source code for the handling and display of
+ * HTML error pages with variable substitution.
+ */
+
+#include "tinyproxy.h"
+
+#include "common.h"
+#include "buffer.h"
+#include "conns.h"
+#include "heap.h"
+#include "html-error.h"
+#include "network.h"
+#include "utils.h"
+
+/*
+ * Add an error number -> filename mapping to the errorpages list.
+ */
+#define ERRORNUM_BUFSIZE 8 /* this is more than required */
+#define ERRPAGES_BUCKETCOUNT 16
+
+int
+add_new_errorpage(char *filepath, unsigned int errornum)
+{
+ char errornbuf[ERRORNUM_BUFSIZE];
+
+ config.errorpages = hashmap_create(ERRPAGES_BUCKETCOUNT);
+ if (!config.errorpages)
+ return (-1);
+
+ snprintf(errornbuf, ERRORNUM_BUFSIZE, "%u", errornum);
+
+ if (hashmap_insert(config.errorpages, errornbuf,
+ filepath, strlen(filepath) + 1) < 0)
+ return (-1);
+
+ return (0);
+}
+
+/*
+ * Get the file appropriate for a given error.
+ */
+static char *
+get_html_file(unsigned int errornum)
+{
+ hashmap_iter result_iter;
+ char errornbuf[ERRORNUM_BUFSIZE];
+ char *key;
+ static char *val;
+
+ assert(errornum >= 100 && errornum < 1000);
+
+ if (!config.errorpages)
+ return (config.errorpage_undef);
+
+ snprintf(errornbuf, ERRORNUM_BUFSIZE, "%u", errornum);
+
+ result_iter = hashmap_find(config.errorpages, errornbuf);
+
+ if (hashmap_is_end(config.errorpages, result_iter))
+ return (config.errorpage_undef);
+
+ if (hashmap_return_entry(config.errorpages, result_iter,
+ &key, (void **)&val) < 0)
+ return (config.errorpage_undef);
+
+ return (val);
+}
+
+/*
+ * Look up the value for a variable.
+ */
+static char *
+lookup_variable(struct conn_s *connptr, char *varname)
+{
+ hashmap_iter result_iter;
+ char *key;
+ static char *data;
+
+ result_iter = hashmap_find(connptr->error_variables, varname);
+
+ if (hashmap_is_end(connptr->error_variables, result_iter))
+ return (NULL);
+
+ if (hashmap_return_entry(connptr->error_variables, result_iter,
+ &key, (void **)&data) < 0)
+ return (NULL);
+
+ return (data);
+}
+
+#define HTML_BUFSIZE 4096
+
+/*
+ * Send an already-opened file to the client with variable substitution.
+ */
+int
+send_html_file(FILE * infile, struct conn_s *connptr)
+{
+ char inbuf[HTML_BUFSIZE], *varstart = NULL, *p;
+ char *varval;
+ int in_variable = 0, writeret;
+
+ while (fgets(inbuf, HTML_BUFSIZE, infile) != NULL) {
+ for (p = inbuf; *p; p++) {
+ switch (*p) {
+ case '}':
+ if (in_variable) {
+ *p = '\0';
+ if (!
+ (varval =
+ lookup_variable(connptr,
+ varstart)))
+ varval = "(unknown)";
+ writeret =
+ write_message(connptr->client_fd,
+ "%s", varval);
+ if (writeret)
+ return (writeret);
+ in_variable = 0;
+ } else {
+ writeret =
+ write_message(connptr->client_fd,
+ "%c", *p);
+ if (writeret)
+ return (writeret);
+ }
+ break;
+ case '{':
+ /* a {{ will print a single {. If we are NOT
+ * already in a { variable, then proceed with
+ * setup. If we ARE already in a { variable,
+ * this code will fallthrough to the code that
+ * just dumps a character to the client fd.
+ */
+ if (!in_variable) {
+ varstart = p + 1;
+ in_variable++;
+ } else
+ in_variable = 0;
+ default:
+ if (!in_variable) {
+ writeret =
+ write_message(connptr->client_fd,
+ "%c", *p);
+ if (writeret)
+ return (writeret);
+ }
+
+ }
+ }
+ in_variable = 0;
+ }
+ return (0);
+}
+
+int
+send_http_headers(struct conn_s *connptr, int code, char *message)
+{
+ char *headers =
+ "HTTP/1.0 %d %s\r\n"
+ "Server: %s/%s\r\n"
+ "Content-Type: text/html\r\n" "Connection: close\r\n" "\r\n";
+
+ return (write_message(connptr->client_fd, headers,
+ code, message, PACKAGE, VERSION));
+}
+
+/*
+ * Display an error to the client.
+ */
+int
+send_http_error_message(struct conn_s *connptr)
+{
+ char *error_file;
+ FILE *infile;
+ int ret;
+ char *fallback_error =
+ "<html><head><title>%s</title></head>"
+ "<body><blockquote><i>%s %s</i><br>"
+ "The page you requested was unavailable. The error code is listed "
+ "below. In addition, the HTML file which has been configured as the "
+ "page to be displayed when an error of this type was unavailable, "
+ "with the error code %d (%s). Please contact your administrator."
+ "<center>%s</center>" "</body></html>" "\r\n";
+
+ send_http_headers(connptr, connptr->error_number,
+ connptr->error_string);
+
+ error_file = get_html_file(connptr->error_number);
+ if (!(infile = fopen(error_file, "r")))
+ return (write_message(connptr->client_fd, fallback_error,
+ connptr->error_string,
+ PACKAGE, VERSION,
+ errno, strerror(errno),
+ connptr->error_string));
+
+ ret = send_html_file(infile, connptr);
+ fclose(infile);
+ return (ret);
+}
+
+/*
+ * Add a key -> value mapping for HTML file substitution.
+ */
+
+#define ERRVAR_BUCKETCOUNT 16
+
+int
+add_error_variable(struct conn_s *connptr, char *key, char *val)
+{
+ if (!connptr->error_variables)
+ if (!
+ (connptr->error_variables =
+ hashmap_create(ERRVAR_BUCKETCOUNT)))
+ return (-1);
+
+ if (hashmap_insert(connptr->error_variables, key, val,
+ strlen(val) + 1) < 0)
+ return (-1);
+
+ return (0);
+}
+
+#define ADD_VAR_RET(x, y) if(y) { if(add_error_variable(connptr, x, y) == -1) return(-1); }
+
+/*
+ * Set some standard variables used by all HTML pages
+ */
+int
+add_standard_vars(struct conn_s *connptr)
+{
+ char timebuf[30];
+ time_t global_time = time(NULL);
+
+ strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT",
+ gmtime(&global_time));
+
+ ADD_VAR_RET("request", connptr->request_line);
+ ADD_VAR_RET("cause", connptr->error_string);
+ ADD_VAR_RET("clientip", connptr->client_ip_addr);
+ ADD_VAR_RET("clienthost", connptr->client_string_addr);
+ ADD_VAR_RET("version", VERSION);
+ ADD_VAR_RET("package", PACKAGE);
+ ADD_VAR_RET("date", timebuf);
+ return (0);
+}
+
+/*
+ * Add the error information to the conn structure.
+ */
+int
+indicate_http_error(struct conn_s *connptr, int number, char *message, ...)
+{
+ va_list ap;
+ char *key, *val;
+
+ va_start(ap, message);
+
+ while ((key = va_arg(ap, char *))) {
+ val = va_arg(ap, char *);
+
+ if (add_error_variable(connptr, key, val) == -1) {
+ va_end(ap);
+ return (-1);
+ }
+ }
+
+ connptr->error_number = number;
+ connptr->error_string = safestrdup(message);
+
+ va_end(ap);
+
+ return (add_standard_vars(connptr));
+}
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