src/FwdState.h

   1 #ifndef SQUID_FORWARD_H
   2 #define SQUID_FORWARD_H
   3
   4 #include "base/RefCount.h"
   5 #include "comm.h"
   6 #include "comm/Connection.h"
   7 #include "err_type.h"
   8 #include "fde.h"
   9 #include "http/StatusCode.h"
  10 #include "ip/Address.h"
  11 #if USE_OPENSSL
  12 #include "ssl/support.h"
  13 #endif
  14
  15 /* forward decls */
  16
  17 class AccessLogEntry;
  18 typedef RefCount<AccessLogEntry> AccessLogEntryPointer;
  19 class PconnPool;
  20 typedef RefCount<PconnPool> PconnPoolPointer;
  21 class ErrorState;
  22 class HttpRequest;
  23
  24 #if USE_OPENSSL
  25 namespace Ssl
  26 {
  27 class ErrorDetail;
  28 class CertValidationResponse;
  29 class PeerConnectorAnswer;
  30 };
  31 #endif
  32
  33 /**
  34  * Returns the TOS value that we should be setting on the connection
  35  * to the server, based on the ACL.
  36  */
  37 tos_t GetTosToServer(HttpRequest * request);
  38
  39 /**
  40  * Returns the Netfilter mark value that we should be setting on the
  41  * connection to the server, based on the ACL.
  42  */
  43 nfmark_t GetNfmarkToServer(HttpRequest * request);
  44
  45 /// Sets initial TOS value and Netfilter for the future outgoing connection.
  46 void GetMarkingsToServer(HttpRequest * request, Comm::Connection &conn);
  47
  48 class HelperReply;
  49
  50 class FwdState : public RefCountable
  51 {
  52 public:
  53     typedef RefCount<FwdState> Pointer;
  54     ~FwdState();
  55     static void initModule();
  56
  57     /// Initiates request forwarding to a peer or origin server.
  58     static void Start(const Comm::ConnectionPointer &client, StoreEntry *, HttpRequest *, const AccessLogEntryPointer &alp);
  59     /// Same as Start() but no master xaction info (AccessLogEntry) available.
  60     static void fwdStart(const Comm::ConnectionPointer &client, StoreEntry *, HttpRequest *);
  61
  62     /// This is the real beginning of server connection. Call it whenever
  63     /// the forwarding server destination has changed and a new one needs to be opened.
  64     /// Produces the cannot-forward error on fail if no better error exists.
  65     void startConnectionOrFail();
  66
  67     void fail(ErrorState *err);
  68     void unregister(Comm::ConnectionPointer &conn);
  69     void unregister(int fd);
  70     void complete();
  71     void handleUnregisteredServerEnd();
  72     int reforward();
  73     bool reforwardableStatus(const Http::StatusCode s) const;
  74     void serverClosed(int fd);
  75     void connectStart();
  76     void connectDone(const Comm::ConnectionPointer & conn, Comm::Flag status, int xerrno);
  77     void connectTimeout(int fd);
  78     bool checkRetry();
  79     bool checkRetriable();
  80     void dispatch();
  81     /// Pops a connection from connection pool if available. If not
  82     /// checks the peer stand-by connection pool for available connection.
  83     Comm::ConnectionPointer pconnPop(const Comm::ConnectionPointer &dest, const char *domain);
  84     void pconnPush(Comm::ConnectionPointer & conn, const char *domain);
  85
  86     bool dontRetry() { return flags.dont_retry; }
  87
  88     void dontRetry(bool val) { flags.dont_retry = val; }
  89
  90     /** return a ConnectionPointer to the current server connection (may or may not be open) */
  91     Comm::ConnectionPointer const & serverConnection() const { return serverConn; };
  92
  93 private:
  94     // hidden for safer management of self; use static fwdStart
  95     FwdState(const Comm::ConnectionPointer &client, StoreEntry *, HttpRequest *, const AccessLogEntryPointer &alp);
  96     void start(Pointer aSelf);
  97
  98 #if STRICT_ORIGINAL_DST
  99     void selectPeerForIntercepted();
 100 #endif
 101     static void logReplyStatus(int tries, const Http::StatusCode status);
 102     void doneWithRetries();
 103     void completed();
 104     void retryOrBail();
 105     ErrorState *makeConnectingError(const err_type type) const;
 106 #if USE_OPENSSL
 107     void connectedToPeer(Ssl::PeerConnectorAnswer &answer);
 108 #endif
 109     static void RegisterWithCacheManager(void);
 110
 111     /// stops monitoring server connection for closure and updates pconn stats
 112     void closeServerConnection(const char *reason);
 113
 114 public:
 115     StoreEntry *entry;
 116     HttpRequest *request;
 117     AccessLogEntryPointer al; ///< info for the future access.log entry
 118
 119     static void abort(void*);
 120
 121 private:
 122     Pointer self;
 123     ErrorState *err;
 124     Comm::ConnectionPointer clientConn;        ///< a possibly open connection to the client.
 125     time_t start_t;
 126     int n_tries;
 127
 128     // AsyncCalls which we set and may need cancelling.
 129     struct {
 130         AsyncCall::Pointer connector;  ///< a call linking us to the ConnOpener producing serverConn.
 131     } calls;
 132
 133     struct {
 134         bool connected_okay; ///< TCP link ever opened properly. This affects retry of POST,PUT,CONNECT,etc
 135         bool dont_retry;
 136         bool forward_completed;
 137     } flags;
 138
 139     /** connections to open, in order, until successful */
 140     Comm::ConnectionList serverDestinations;
 141
 142     Comm::ConnectionPointer serverConn; ///< a successfully opened connection to a server.
 143
 144     /// possible pconn race states
 145     typedef enum { raceImpossible, racePossible, raceHappened } PconnRace;
 146     PconnRace pconnRace; ///< current pconn race state
 147
 148     // NP: keep this last. It plays with private/public
 149     CBDATA_CLASS2(FwdState);
 150 };
 151
 152 void getOutgoingAddress(HttpRequest * request, Comm::ConnectionPointer conn);
 153
 154 #endif /* SQUID_FORWARD_H */