/*
- * context_loop.c
+ * $Id$
*
* This is the other half of the webserver. It handles the task of hooking
- * up HTTP requests with the session they belong to, using HTTP cookies to
+ * up HTTP requests with the sessions they belong to, using HTTP cookies to
* keep track of things. If the HTTP request doesn't belong to any currently
- * active session, a new session is spawned.
+ * active session, a new session is started.
*
- * $Id$
*/
-#include <ctype.h>
-#include <stdlib.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#include <stdio.h>
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/socket.h>
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-#ifdef HAVE_LIMITS_H
-#include <limits.h>
-#endif
-#include <netinet/in.h>
-#include <netdb.h>
-#include <string.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <pthread.h>
-#include <signal.h>
#include "webcit.h"
#include "webserver.h"
/* Only one thread may manipulate SessionList at a time... */
pthread_mutex_t SessionListMutex;
-struct wcsession *SessionList = NULL;
+struct wcsession *SessionList = NULL; /**< our sessions ????*/
-pthread_key_t MyConKey; /* TSD key for MySession() */
+pthread_key_t MyConKey; /**< TSD key for MySession() */
-void do_housekeeping(void)
+
+/*
+ * free the memory used for viewing atachments
+ */
+void free_attachments(struct wcsession *sess) {
+ struct wc_attachment *att;
+
+ while (sess->first_attachment != NULL) {
+ att = sess->first_attachment;
+ sess->first_attachment = sess->first_attachment->next;
+ free(att->data);
+ free(att);
+ }
+}
+
+
+void DestroySession(struct wcsession **sessions_to_kill)
{
- struct wcsession *sptr, *ss, *session_to_kill;
+ close((*sessions_to_kill)->serv_sock);
+ close((*sessions_to_kill)->chat_sock);
+// if ((*sessions_to_kill)->preferences != NULL) {
+// free((*sessions_to_kill)->preferences);
+// }
+ if ((*sessions_to_kill)->cache_fold != NULL) {
+ free((*sessions_to_kill)->cache_fold);
+ }
+ free_attachments((*sessions_to_kill));
+ free_march_list((*sessions_to_kill));
+ DeleteHash(&((*sessions_to_kill)->hash_prefs));
+ DeleteHash(&((*sessions_to_kill)->IconBarSetttings));
+ DeleteHash(&((*sessions_to_kill)->ServCfg));
+ FreeStrBuf(&((*sessions_to_kill)->UrlFragment1));
+ FreeStrBuf(&((*sessions_to_kill)->UrlFragment2));
+ FreeStrBuf(&((*sessions_to_kill)->WBuf));
+ FreeStrBuf(&((*sessions_to_kill)->HBuf));
+
+ free((*sessions_to_kill));
+ (*sessions_to_kill) = NULL;
+}
- do {
- session_to_kill = NULL;
- pthread_mutex_lock(&SessionListMutex);
- for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
+void shutdown_sessions(void)
+{
+ struct wcsession *sptr;
+
+ for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
+ sptr->killthis = 1;
+ }
+}
- /* Kill idle sessions */
- if ((time(NULL) - (sptr->lastreq)) >
- (time_t) WEBCIT_TIMEOUT) {
- sptr->killthis = 1;
- }
+void do_housekeeping(void)
+{
+ struct wcsession *sptr, *ss;
+ struct wcsession *sessions_to_kill = NULL;
+ int num_sessions = 0;
+ static int num_threads = MIN_WORKER_THREADS;
+
+ /**
+ * Lock the session list, moving any candidates for euthanasia into
+ * a separate list.
+ */
+ pthread_mutex_lock(&SessionListMutex);
+ num_sessions = 0;
+ for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
+ ++num_sessions;
+
+ /** Kill idle sessions */
+ if ((time(NULL) - (sptr->lastreq)) >
+ (time_t) WEBCIT_TIMEOUT) {
+ sptr->killthis = 1;
+ }
- /* Remove sessions flagged for kill */
- if (sptr->killthis) {
+ /** Remove sessions flagged for kill */
+ if (sptr->killthis) {
- /* remove session from linked list */
- if (sptr == SessionList) {
- SessionList = SessionList->next;
- }
- else for (ss=SessionList;ss!=NULL;ss=ss->next) {
- if (ss->next == sptr) {
- ss->next = ss->next->next;
- }
+ /** remove session from linked list */
+ if (sptr == SessionList) {
+ SessionList = SessionList->next;
+ }
+ else for (ss=SessionList;ss!=NULL;ss=ss->next) {
+ if (ss->next == sptr) {
+ ss->next = ss->next->next;
}
-
- session_to_kill = sptr;
- goto BREAKOUT;
}
- }
-BREAKOUT: pthread_mutex_unlock(&SessionListMutex);
- if (session_to_kill != NULL) {
- pthread_mutex_lock(&session_to_kill->SessionMutex);
- close(session_to_kill->serv_sock);
- pthread_mutex_unlock(&session_to_kill->SessionMutex);
- free(session_to_kill);
+ sptr->next = sessions_to_kill;
+ sessions_to_kill = sptr;
}
+ }
+ pthread_mutex_unlock(&SessionListMutex);
- } while (session_to_kill != NULL);
+ /**
+ * Now free up and destroy the culled sessions.
+ */
+ while (sessions_to_kill != NULL) {
+ lprintf(3, "Destroying session %d\n", sessions_to_kill->wc_session);
+ pthread_mutex_lock(&sessions_to_kill->SessionMutex);
+ pthread_mutex_unlock(&sessions_to_kill->SessionMutex);
+ sptr = sessions_to_kill->next;
+
+ DestroySession(&sessions_to_kill);
+ sessions_to_kill = sptr;
+ --num_sessions;
+ }
+
+ /**
+ * If there are more sessions than threads, then we should spawn
+ * more threads ... up to a predefined maximum.
+ */
+ while ( (num_sessions > num_threads)
+ && (num_threads <= MAX_WORKER_THREADS) ) {
+ spawn_another_worker_thread();
+ ++num_threads;
+ lprintf(3, "There are %d sessions and %d threads active.\n",
+ num_sessions, num_threads);
+ }
}
-/*
- * Wake up occasionally and clean house
+/**
+ * \brief Wake up occasionally and clean house
*/
void housekeeping_loop(void)
{
while (1) {
- sleep(HOUSEKEEPING);
+ sleeeeeeeeeep(HOUSEKEEPING);
do_housekeeping();
}
}
-/*
+/**
+ * \brief Create a Session id
* Generate a unique WebCit session ID (which is not the same thing as the
* Citadel session ID).
*
- * FIX ... ensure that session number is truly unique
+ * \todo FIXME ... ensure that session number is truly unique
*
*/
int GenerateSessionID(void)
/*
* Collapse multiple cookies on one line
*/
-int req_gets(int sock, char *buf, char *hold)
+int req_gets(int *sock, char *buf, char *hold, size_t hlen)
{
- int a;
+ int a, b;
- if (strlen(hold) == 0) {
- a = client_gets(sock, buf);
+ if (IsEmptyStr(hold)) {
+ strcpy(buf, "");
+ a = client_getln(sock, buf, SIZ);
if (a<1) return(-1);
} else {
- strcpy(buf, hold);
+ safestrncpy(buf, hold, SIZ);
}
strcpy(hold, "");
if (!strncasecmp(buf, "Cookie: ", 8)) {
- for (a = 0; a < strlen(buf); ++a)
+ int len;
+ len = strlen(buf);
+ for (a = 0; a < len; ++a)
if (buf[a] == ';') {
- sprintf(hold, "Cookie: %s", &buf[a + 1]);
+ // we don't refresh len, because of we
+ // only exit from here.
+ snprintf(hold, hlen, "Cookie: %s", &buf[a + 1]);
buf[a] = 0;
- while (isspace(hold[8]))
- strcpy(&hold[8], &hold[9]);
+ b = 8;
+ while (isspace(hold[b]))
+ b++;
+
+ memmove(&hold[8], &hold[b], len - b + 1);
return(0);
}
}
+
return(0);
}
* lingering_close() a`la Apache. see
* http://www.apache.org/docs/misc/fin_wait_2.html for rationale
*/
-
-static int lingering_close(int fd)
+int lingering_close(int fd)
{
- char buf[256];
+ char buf[SIZ];
int i;
fd_set set;
struct timeval tv, start;
+/**
+ * \brief sanity requests
+ * Check for bogus requests coming from brain-dead Windows boxes.
+ *
+ * \param http_cmd The HTTP request to check
+ */
+int is_bogus(char *http_cmd) {
+ char *url;
+ int i, max;
+
+ url = strstr(http_cmd, " ");
+ if (url == NULL) return(1);
+ ++url;
+
+ char *bogus_prefixes[] = {
+ "/scripts/root.exe", /**< Worms and trojans and viruses, oh my! */
+ "/c/winnt",
+ "/MSADC/",
+ "/_vti", /**< Broken Microsoft DAV implementation */
+ "/MSOffice" /**< Stoopid MSOffice thinks everyone is IIS */
+ };
+
+ max = sizeof(bogus_prefixes) / sizeof(char *);
+
+ for (i=0; i<max; ++i) {
+ if (!strncasecmp(url, bogus_prefixes[i], strlen(bogus_prefixes[i]))) {
+ return(2);
+ }
+ }
-/*
+ return(0); /* probably ok */
+}
+
+
+
+/**
+ * \brief handle one request
* This loop gets called once for every HTTP connection made to WebCit. At
* this entry point we have an HTTP socket with a browser allegedly on the
* other end, but we have not yet bound to a WebCit session.
* transaction loop. Afterwards, we unbind from the session. When this
* function returns, the worker thread is then free to handle another
* transaction.
+ * \param sock the socket we will put our answer to
*/
-void context_loop(int sock)
+void context_loop(int *sock)
{
struct httprequest *req = NULL;
struct httprequest *last = NULL;
struct httprequest *hptr;
- char buf[256], hold[256];
+ char buf[SIZ], hold[SIZ];
int desired_session = 0;
int got_cookie = 0;
+ int gzip_ok = 0;
struct wcsession *TheSession, *sptr;
-
- /*
+ char httpauth_string[1024];
+ char httpauth_user[1024];
+ char httpauth_pass[1024];
+ char accept_language[256];
+ char *ptr = NULL;
+ int session_is_new = 0;
+
+ strcpy(httpauth_string, "");
+ strcpy(httpauth_user, DEFAULT_HTTPAUTH_USER);
+ strcpy(httpauth_pass, DEFAULT_HTTPAUTH_PASS);
+
+ /**
* Find out what it is that the web browser is asking for
*/
+ memset(hold, 0, sizeof(hold));
do {
- if (req_gets(sock, buf, hold) < 0) return;
+ if (req_gets(sock, buf, hold, SIZ) < 0) return;
+
+ /**
+ * Can we compress?
+ */
+ if (!strncasecmp(buf, "Accept-encoding:", 16)) {
+ if (strstr(&buf[16], "gzip")) {
+ gzip_ok = 1;
+ }
+ }
+
+ /**
+ * Browser-based sessions use cookies for session authentication
+ */
if (!strncasecmp(buf, "Cookie: webcit=", 15)) {
cookie_to_stuff(&buf[15], &desired_session,
- NULL, NULL, NULL);
+ NULL, 0, NULL, 0, NULL, 0);
got_cookie = 1;
}
+ /**
+ * GroupDAV-based sessions use HTTP authentication
+ */
+ if (!strncasecmp(buf, "Authorization: Basic ", 21)) {
+ CtdlDecodeBase64(httpauth_string, &buf[21], strlen(&buf[21]));
+ extract_token(httpauth_user, httpauth_string, 0, ':', sizeof httpauth_user);
+ extract_token(httpauth_pass, httpauth_string, 1, ':', sizeof httpauth_pass);
+ }
+
+ if (!strncasecmp(buf, "If-Modified-Since: ", 19)) {
+ if_modified_since = httpdate_to_timestamp(&buf[19]);
+ }
+
+ if (!strncasecmp(buf, "Accept-Language: ", 17)) {
+ safestrncpy(accept_language, &buf[17], sizeof accept_language);
+ }
+
+ /**
+ * Read in the request
+ */
hptr = (struct httprequest *)
malloc(sizeof(struct httprequest));
if (req == NULL)
hptr->next = NULL;
last = hptr;
- strcpy(hptr->line, buf);
+ safestrncpy(hptr->line, buf, sizeof hptr->line);
- } while (strlen(buf) > 0);
+ } while (!IsEmptyStr(buf));
+ /**
+ * If the request is prefixed by "/webcit" then chop that off. This
+ * allows a front end web server to forward all /webcit requests to us
+ * while still using the same web server port for other things.
+ */
+
+ ptr = strstr(req->line, " /webcit "); /*< Handle "/webcit" */
+ if (ptr != NULL) {
+ strcpy(ptr+2, ptr+8);
+ }
- /*
- * If requesting a non-root page, there should already be a cookie
- * set. If there isn't, the client browser has cookies turned off
- * (or doesn't support them) and we have to barf & bail.
+ ptr = strstr(req->line, " /webcit"); /*< Handle "/webcit/" */
+ if (ptr != NULL) {
+ strcpy(ptr+1, ptr+8);
+ }
+
+ safestrncpy(buf, req->line, sizeof buf);
+ /** Begin parsing the request. */
+#ifdef TECH_PREVIEW
+ if ((strncmp(req->line+4, "/sslg", 5) != 0) &&
+ (strncmp(req->line+4, "/static/", 8) != 0) &&
+ (strncmp(req->line+4, "/wholist_section", 16) != 0)) {
+#endif
+ lprintf(5, "HTTP: %s\n", buf);
+#ifdef TECH_PREVIEW
+ }
+#endif
+
+ /** Check for bogus requests */
+ if (is_bogus(buf)) {
+ strcpy(req->line, "GET /404 HTTP/1.1");
+ strcpy(buf, "GET /404 HTTP/1.1");
+ }
+
+ /**
+ * Strip out the method, leaving the URL up front...
*/
- strcpy(buf, req->line);
- if (!strncasecmp(buf, "GET ", 4)) strcpy(buf, &buf[4]);
- else if (!strncasecmp(buf, "HEAD ", 5)) strcpy(buf, &buf[5]);
+ remove_token(buf, 0, ' ');
if (buf[1]==' ') buf[1]=0;
- /*
+ /**
* While we're at it, gracefully handle requests for the
- * robots.txt file...
+ * robots.txt and favicon.ico files.
*/
if (!strncasecmp(buf, "/robots.txt", 11)) {
- strcpy(req->line, "GET /static/robots.txt HTTP/1.0");
+ strcpy(req->line, "GET /static/robots.txt"
+ "?force_close_session=yes HTTP/1.1");
}
-
- /* Do the non-root-cookie check now. */
- else if ( (strcmp(buf, "/")) && (got_cookie == 0)) {
- strcpy(req->line, "GET /static/nocookies.html HTTP/1.0");
+ else if (!strncasecmp(buf, "/favicon.ico", 12)) {
+ strcpy(req->line, "GET /static/favicon.ico");
}
+ /**
+ * These are the URL's which may be executed without a
+ * session cookie already set. If it's not one of these,
+ * force the session to close because cookies are
+ * probably disabled on the client browser.
+ */
+ else if ( (strcmp(buf, "/"))
+ && (strncasecmp(buf, "/listsub", 8))
+ && (strncasecmp(buf, "/freebusy", 9))
+ && (strncasecmp(buf, "/do_logout", 10))
+ && (strncasecmp(buf, "/groupdav", 9))
+ && (strncasecmp(buf, "/static", 7))
+ && (strncasecmp(buf, "/rss", 4))
+ && (strncasecmp(buf, "/404", 4))
+ && (got_cookie == 0)) {
+ strcpy(req->line, "GET /static/nocookies.html"
+ "?force_close_session=yes HTTP/1.1");
+ }
-
- /*
- * See if there's an existing session open with the desired ID
+ /**
+ * See if there's an existing session open with the desired ID or user/pass
*/
TheSession = NULL;
- if (desired_session != 0) {
+
+ if (TheSession == NULL) {
pthread_mutex_lock(&SessionListMutex);
for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
- if (sptr->wc_session == desired_session) {
+
+ /** If HTTP-AUTH, look for a session with matching credentials */
+ if ( (!IsEmptyStr(httpauth_user))
+ &&(!strcasecmp(sptr->httpauth_user, httpauth_user))
+ &&(!strcasecmp(sptr->httpauth_pass, httpauth_pass)) ) {
+ TheSession = sptr;
+ }
+
+ /** If cookie-session, look for a session with matching session ID */
+ if ( (desired_session != 0) && (sptr->wc_session == desired_session)) {
TheSession = sptr;
}
+
}
pthread_mutex_unlock(&SessionListMutex);
}
- /*
+ /**
* Create a new session if we have to
*/
if (TheSession == NULL) {
- fprintf(stderr, "Creating a new session\n");
+ lprintf(3, "Creating a new session\n");
TheSession = (struct wcsession *)
malloc(sizeof(struct wcsession));
memset(TheSession, 0, sizeof(struct wcsession));
- TheSession->wc_session = GenerateSessionID();
- pthread_mutex_init(&TheSession->SessionMutex, NULL);
+ TheSession->serv_sock = (-1);
+ TheSession->chat_sock = (-1);
+
+ /* If we're recreating a session that expired, it's best to give it the same
+ * session number that it had before. The client browser ought to pick up
+ * the new session number and start using it, but in some rare situations it
+ * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
+ * to get created.
+ */
+ if (desired_session == 0) {
+ TheSession->wc_session = GenerateSessionID();
+ }
+ else {
+ TheSession->wc_session = desired_session;
+ }
+ strcpy(TheSession->httpauth_user, httpauth_user);
+ strcpy(TheSession->httpauth_pass, httpauth_pass);
+ TheSession->hash_prefs = NewHash(1,NULL); /* Get a hash table for the user preferences */
+ pthread_mutex_init(&TheSession->SessionMutex, NULL);
pthread_mutex_lock(&SessionListMutex);
+ TheSession->urlstrings = NULL;
+ TheSession->vars = NULL;
+ TheSession->nonce = rand();
+ TheSession->WBuf = NULL;
TheSession->next = SessionList;
SessionList = TheSession;
pthread_mutex_unlock(&SessionListMutex);
+ session_is_new = 1;
}
-
/*
- *
- * FIX ... check session integrity here before continuing
- *
+ * A future improvement might be to check the session integrity
+ * at this point before continuing.
*/
-
-
/*
* Bind to the session and perform the transaction
*/
pthread_mutex_lock(&TheSession->SessionMutex); /* bind */
pthread_setspecific(MyConKey, (void *)TheSession);
- TheSession->http_sock = sock;
+
+ TheSession->urlstrings = NewHash(1,NULL);
+ TheSession->vars = NewHash(1,NULL);
+ TheSession->http_sock = *sock;
TheSession->lastreq = time(NULL); /* log */
- fprintf(stderr, "%s\n", req->line);
- session_loop(req); /* perform the requested transaction */
+ TheSession->gzip_ok = gzip_ok;
+#ifdef ENABLE_NLS
+ if (session_is_new) {
+ httplang_to_locale(accept_language);
+ }
+ go_selected_language(); /* set locale */
+#endif
+ session_loop(req); /* do transaction */
+#ifdef ENABLE_NLS
+ stop_selected_language(); /* unset locale */
+#endif
+ DeleteHash(&TheSession->urlstrings);
+ DeleteHash(&TheSession->vars);
+ FreeStrBuf(&TheSession->WBuf);
+ FreeStrBuf(&TheSession->HBuf);
+
+
pthread_mutex_unlock(&TheSession->SessionMutex); /* unbind */
/* Free the request buffer */
}
/*
- * Now our HTTP connection is done. Close the socket and exit this
- * function, so the worker thread can handle a new HTTP connection.
+ * Free up any session-local substitution variables which
+ * were set during this transaction
*/
- lingering_close(sock);
+
+
+}
+
+void tmpl_nonce(StrBuf *Target, int nArgs, WCTemplateToken *Tokens, void *Context)
+{
+ struct wcsession *WCC = WC;
+ StrBufAppendPrintf(Target, "%ld",
+ (WCC != NULL)? WCC->nonce:0);
+}
+
+void
+InitModule_CONTEXT
+(void)
+{
+ RegisterNamespace("NONCE", 0, 0, tmpl_nonce);
}
projects / citadel.git / blobdiff