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/* $Cambridge: hermes/src/prayer/servers/session_exchange.c,v 1.7 2011/01/11 15:27:24 dpc22 Exp $ */
/************************************************
* Prayer - a Webmail Interface *
************************************************/
/* Copyright (c) University of Cambridge 2000 - 2008 */
/* See the file NOTICE for conditions of use and distribution. */
#include "server.h"
/* session_exchange() ***************************************************
*
* Manage single HTTP exchange with user agent (can be initiated by
* proxy frontend or direct connection to session server).
***********************************************************************/
BOOL session_exchange(struct session * session)
{
struct prefs *prefs = session->options->prefs;
struct config *config = session->config;
struct request *request = session->request;
struct user_agent *user_agent = request->user_agent;
char *sequence;
struct template_vals *tvals;
char *template_set = config->template_set;
/* Do something useful with HTTP/0.9 */
if (request->major == 0) {
response_0_9_error(request);
return (NIL);
}
/* Check for valid host if one supplied */
if (request->url_host) {
BOOL rc = NIL;
if (!strcasecmp(request->url_host, "localhost"))
rc = T;
else if (config->hostname &&
!strcasecmp(request->url_host, config->hostname))
rc = T;
else if (config->hostname_service &&
!strcasecmp(request->url_host, config->hostname_service))
rc = T;
if (!rc) {
response_error(request, 403); /* Forbidden */
return (NIL);
}
}
request_parse_argv(request);
request_parse_charset(request);
if (session->use_gzip) {
request->allow_gzip = T;
request_parse_encoding(request);
} else
request->allow_gzip = NIL;
/* argv: /session/username/session/sequence... */
if ((request->argc < 5) || (strcmp(request->argv[0], "session") != 0)) {
response_error(request, 404); /* Not found */
return (NIL);
}
sequence = request->argv[3];
request->argv = &request->argv[4];
request->argc -= 4;
session->sequence_okay = T;
if (strcmp(sequence, "NOSEQ") != 0) {
BOOL error = NIL;
if (session->sequence != session_sequence(sequence))
session->sequence_okay = NIL;
session_bump_sequence(session);
session_update_sequence(session);
if (user_agent->use_substitution) {
/* Check that the sequence number is correct:
* Browser back button doesn't work with page substituton enabled
* Spell checker and browser buttons don't get on at all well
* (flag forall methods would be sensible)
*/
if (!session->sequence_okay)
error = T;
} else {
/* Browser back button works fine without page substition
* apart from folder changes.
*/
if (session->sequence_last_change > session_sequence(sequence))
error = T;
}
if (error) {
char *last_cmd = session_last_cmd(session);
if (last_cmd && last_cmd[0]) {
session_message(session,
("Browser history disabled as unsafe: "
"use Webmail navigation icons and links"));
session_redirect(session, request, last_cmd);
return (T);
}
session_log(session, ("[session_exchange] "
"Internal error: last command not recorded"));
session_redirect(session, request, "restart");
return (T);
}
} else {
/* Just in case NOSEQ URL generates a redirect */
session_update_sequence(session);
}
/* Only safe to call session_redirect() after this point */
/* Check IMAP streams before processing each session request
* (reopens streams if required + ping every once in a while
* Have to do this here rather than in parent routines so that we
* have a HTTP connection back to client for restart page...
*
* Don't make this test if it would cause infinite loop of redirects
*/
if ((strcmp(request->argv[0], "restart") != 0) &&
(strcmp(request->argv[0], "exit") != 0)) {
if (!session_streams_check(session)) {
session_redirect(session, request, "restart");
return (T);
}
}
/* Reopen local domains every once in a while */
session_config_local_domain_ping(session->config);
session_log(session, "[session_exchange] %s", request->argv[0]);
if (config->template_list &&
list_lookup_byname(config->template_list, prefs->template_set))
template_set = prefs->template_set;
else
template_set = config->template_set; /* Safe default */
dlopen_templates(template_set, "");
/* Set up template_vars ready for dispatch */
session->template_vals = tvals
= template_vals_create(request->pool,
config->template_path,
template_set,
config->template_use_compiled, T,
session_extract_urlstate(session));
template_vals_string(tvals, "g_cmd", request->argv[0]);
/* Look for defined session method */
if (cmd_dispatch(session, request->argv[0]))
return (request->persist);
if ((request->method == GET) || (request->method == HEAD))
response_error(request, 404); /* Not found */
else
response_error(request, 501); /* Not implemented */
return (NIL);
}
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