243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
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/* $Id: htmlerror.c,v 1.1 2003-03-13 21:25:06 rjkaes Exp $
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*
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* This file contains source code for the handling and display of
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* HTML error pages with variable substitution.
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*/
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#include "tinyproxy.h"
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#include "common.h"
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#include "buffer.h"
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#include "conns.h"
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#include "heap.h"
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#include "htmlerror.h"
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#include "network.h"
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#include "utils.h"
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/* Add an error number -> filename mapping to the errorpages list. */
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int add_new_errorpage(char *filepath, unsigned int errornum) {
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static int errorpage_count = 1;
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/* First, add space for another pointer to the errorpages array. */
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config.errorpages = saferealloc(config.errorpages, sizeof(struct error_pages_s *) * (errorpage_count + 1));
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if(!config.errorpages)
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return(-1);
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/* Allocate space for an actual structure */
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config.errorpages[errorpage_count - 1] = safemalloc(sizeof(struct error_pages_s));
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if(!config.errorpages[errorpage_count - 1])
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return(-1);
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/* Set values for errorpage structure. */
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config.errorpages[errorpage_count - 1]->errorpage_path = safestrdup(filepath);
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if(!config.errorpages[errorpage_count - 1]->errorpage_path)
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return(-1);
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config.errorpages[errorpage_count - 1]->errorpage_errnum = errornum;
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/* Set NULL to denote end of array */
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config.errorpages[errorpage_count] = NULL;
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errorpage_count++;
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return(0);
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}
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/* Get the file appropriate for a given error. */
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char *get_html_file(int errornum) {
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int i;
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if(!config.errorpages) return(config.errorpage_undef);
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for(i = 0; config.errorpages[i]; i++) {
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if(config.errorpages[i]->errorpage_errnum == errornum)
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return(config.errorpages[i]->errorpage_path);
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}
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return(config.errorpage_undef);
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}
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/* Look up the value for a variable. */
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char *lookup_variable(struct conn_s *connptr, char *varname) {
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int i;
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for(i = 0; i<connptr->error_variable_count; i++) {
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if(!strcasecmp(connptr->error_variables[i]->error_key, varname))
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return(connptr->error_variables[i]->error_val);
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}
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return(NULL);
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}
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#define HTML_BUFSIZE 4096
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/* Send an already-opened file to the client with
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* variable substitution. */
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int send_html_file(FILE *infile, struct conn_s *connptr) {
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char inbuf[HTML_BUFSIZE], *varstart = NULL, *p;
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char *varval;
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int in_variable = 0, writeret;
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while(fgets(inbuf, HTML_BUFSIZE, infile) != NULL) {
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for(p = inbuf; *p; p++) {
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switch(*p) {
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case '}':
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if(in_variable) {
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*p = '\0';
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if(!(varval = lookup_variable(connptr, varstart)))
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varval = "(unknown)";
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writeret = write_message(connptr->client_fd, "%s",
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varval);
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if(writeret) return(writeret);
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in_variable = 0;
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break;
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}
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/* If we are not in a variable, then
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* we fallthrough. the code for { will
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* not do anything if in_variable is set to
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* 0. it will end up in the default
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* handler which will send the }.
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*/
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case '{':
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/* a {{ will print a single {. If we are NOT
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* already in a { variable, then proceed with
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* setup. If we ARE already in a { variable,
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* this code will fallthrough to the code that
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* just dumps a character to the client fd.
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*/
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if(!in_variable) {
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varstart = p+1;
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in_variable++;
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}
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default:
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if(!in_variable) {
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writeret = write_message(connptr->client_fd, "%c",
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*p);
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if(writeret) return(writeret);
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}
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}
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}
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in_variable = 0;
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}
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return(0);
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}
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int send_http_headers(struct conn_s *connptr, int code, char *message) {
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char *headers = \
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"HTTP/1.0 %d %s\r\n" \
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"Server: %s/%s\r\n" \
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"Content-Type: text/html\r\n" \
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"Connection: close\r\n" \
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"\r\n";
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return(write_message(connptr->client_fd, headers,
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code, message,
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PACKAGE, VERSION));
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}
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/*
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* Display an error to the client.
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*/
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int
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send_http_error_message(struct conn_s *connptr)
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{
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char *error_file;
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FILE *infile;
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int ret;
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char *fallback_error = \
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"<html><head><title>%s</title></head>" \
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"<body><blockquote><i>%s %s</i><br>" \
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"The page you requested was unavailable. The error code is listed " \
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"below. In addition, the HTML file which has been configured as the " \
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"page to be displayed when an error of this type was unavailable, " \
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"with the error code %d (%s). Please contact your administrator." \
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"<center>%s</center>" \
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"</body></html>" \
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"\r\n";
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send_http_headers(connptr, connptr->error_number, connptr->error_string);
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error_file = get_html_file(connptr->error_number);
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if(!(infile = fopen(error_file, "r")))
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return(write_message(connptr->client_fd, fallback_error,
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connptr->error_string,
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PACKAGE, VERSION,
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errno, strerror(errno),
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connptr->error_string));
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ret = send_html_file(infile, connptr);
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fclose(infile);
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return(ret);
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}
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/*
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* Add a key -> value mapping for HTML file substitution.
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*/
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int
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add_error_variable(struct conn_s *connptr, char *key, char *val)
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{
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connptr->error_variable_count++;
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/* Add space for a new pointer to the error_variables structure. */
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connptr->error_variables = saferealloc(connptr->error_variables, sizeof(struct error_variable_s *) * connptr->error_variable_count);
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if(!connptr->error_variables)
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return(-1);
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/* Allocate a new variable mapping structure. */
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connptr->error_variables[connptr->error_variable_count - 1] = safemalloc(sizeof(struct error_variable_s));
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if(!connptr->error_variables[connptr->error_variable_count - 1])
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return(-1);
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/* Set values for variable mapping. */
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connptr->error_variables[connptr->error_variable_count - 1]->error_key = safestrdup(key);
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connptr->error_variables[connptr->error_variable_count - 1]->error_val = safestrdup(val);
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if((!connptr->error_variables[connptr->error_variable_count - 1]->error_key)
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|| (!connptr->error_variables[connptr->error_variable_count - 1]->error_val))
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return(-1);
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return(0);
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}
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#define ADD_VAR_RET(x, y) if(y) { if(add_error_variable(connptr, x, y) == -1) return(-1); }
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/* Set some standard variables used by all HTML pages */
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int add_standard_vars(struct conn_s *connptr) {
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char timebuf[30];
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time_t global_time = time(NULL);
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strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT",
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gmtime(&global_time));
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ADD_VAR_RET("request", connptr->request_line);
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ADD_VAR_RET("cause", connptr->error_string);
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ADD_VAR_RET("clientip", connptr->client_ip_addr);
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ADD_VAR_RET("clienthost", connptr->client_string_addr);
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ADD_VAR_RET("version", VERSION);
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ADD_VAR_RET("package", PACKAGE);
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ADD_VAR_RET("date", timebuf);
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return(0);
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}
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/*
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* Add the error information to the conn structure.
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*/
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int
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indicate_http_error(struct conn_s* connptr, int number, char *message, ...)
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{
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va_list ap;
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char *key, *val;
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va_start(ap, message);
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while((key = va_arg(ap, char *))) {
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val = va_arg(ap, char *);
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if(add_error_variable(connptr, key, val) == -1)
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return(-1);
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}
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connptr->error_number = number;
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connptr->error_string = safestrdup(message);
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return(add_standard_vars(connptr));
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}
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