urldata.h

#ifndef __URLDATA_H
#define __URLDATA_H
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

/* This file is for lib internal stuff */

#include "setup.h"

#define PORT_FTP 21
#define PORT_FTPS 990
#define PORT_TELNET 23
#define PORT_HTTP 80
#define PORT_HTTPS 443
#define PORT_DICT 2628
#define PORT_LDAP 389
#define PORT_LDAPS 636
#define PORT_TFTP 69
#define PORT_SSH 22

#define DICT_MATCH "/MATCH:"
#define DICT_MATCH2 "/M:"
#define DICT_MATCH3 "/FIND:"
#define DICT_DEFINE "/DEFINE:"
#define DICT_DEFINE2 "/D:"
#define DICT_DEFINE3 "/LOOKUP:"

#define CURL_DEFAULT_USER "anonymous"
#define CURL_DEFAULT_PASSWORD "ftp@example.com"

#include "cookie.h"
#include "formdata.h"

#ifdef USE_SSLEAY
#ifdef USE_OPENSSL
#include "openssl/rsa.h"
#include "openssl/crypto.h"
#include "openssl/x509.h"
#include "openssl/pem.h"
#include "openssl/ssl.h"
#include "openssl/err.h"
#ifdef HAVE_OPENSSL_ENGINE_H
#include <openssl/engine.h>
#endif
#ifdef HAVE_OPENSSL_PKCS12_H
#include <openssl/pkcs12.h>
#endif
#else /* SSLeay-style includes */
#include "rsa.h"
#include "crypto.h"
#include "x509.h"
#include "pem.h"
#include "ssl.h"
#include "err.h"
#endif /* USE_OPENSSL */
#ifdef USE_GNUTLS
#error Configuration error; cannot use GnuTLS *and* OpenSSL.
#endif
#endif /* USE_SSLEAY */

#ifdef USE_GNUTLS
#include <gnutls/gnutls.h>
#endif

#ifdef USE_NSS
#include <nspr.h>
#endif

#ifdef USE_QSOSSL
#include <qsossl.h>
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#include "timeval.h"

#ifdef HAVE_ZLIB_H
#include <zlib.h>               /* for content-encoding */
#endif

#ifdef USE_ARES
#include <ares.h>
#endif

#include <curl/curl.h>

#include "http_chunks.h" /* for the structs and enum stuff */
#include "hostip.h"
#include "hash.h"
#include "splay.h"

#ifdef HAVE_GSSAPI
# ifdef HAVE_GSSGNU
#  include <gss.h>
# elif defined HAVE_GSSMIT
#  include <gssapi/gssapi.h>
#  include <gssapi/gssapi_generic.h>
# else
#  include <gssapi.h>
# endif
#endif

#ifdef HAVE_LIBSSH2_H
#include <libssh2.h>
#include <libssh2_sftp.h>
#endif /* HAVE_LIBSSH2_H */

/* Download buffer size, keep it fairly big for speed reasons */
#undef BUFSIZE
#define BUFSIZE CURL_MAX_WRITE_SIZE

/* Initial size of the buffer to store headers in, it'll be enlarged in case
   of need. */
#define HEADERSIZE 256

#define CURLEASY_MAGIC_NUMBER 0xc0dedbadU

/* Just a convenience macro to get the larger value out of two given.
   We prefix with CURL to prevent name collisions. */
#define CURLMAX(x,y) ((x)>(y)?(x):(y))

#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
/* Types needed for krb4/5-ftp connections */
struct krb4buffer {
  void *data;
  size_t size;
  size_t index;
  int eof_flag;
};
enum protection_level {
  prot_clear,
  prot_safe,
  prot_confidential,
  prot_private,
  prot_cmd
};
#endif

/* enum for the nonblocking SSL connection state machine */
typedef enum {
  ssl_connect_1,
  ssl_connect_2,
  ssl_connect_2_reading,
  ssl_connect_2_writing,
  ssl_connect_3,
  ssl_connect_done
} ssl_connect_state;

typedef enum {
  ssl_connection_none,
  ssl_connection_negotiating,
  ssl_connection_complete
} ssl_connection_state;

/* struct for data related to each SSL connection */
struct ssl_connect_data {
  /* Use ssl encrypted communications TRUE/FALSE, not necessarily using it atm
     but at least asked to or meaning to use it. See 'state' for the exact
     current state of the connection. */
  bool use;
  ssl_connection_state state;
#ifdef USE_SSLEAY
  /* these ones requires specific SSL-types */
  SSL_CTX* ctx;
  SSL*     handle;
  X509*    server_cert;
  ssl_connect_state connecting_state;
#endif /* USE_SSLEAY */
#ifdef USE_GNUTLS
  gnutls_session session;
  gnutls_certificate_credentials cred;
#endif /* USE_GNUTLS */
#ifdef USE_NSS
  PRFileDesc *handle;
  char *client_nickname;
#endif /* USE_NSS */
#ifdef USE_QSOSSL
  SSLHandle *handle;
#endif /* USE_QSOSSL */
};

struct ssl_config_data {
  long version;          /* what version the client wants to use */
  long certverifyresult; /* result from the certificate verification */
  long verifypeer;       /* set TRUE if this is desired */
  long verifyhost;       /* 0: no verify
                            1: check that CN exists
                            2: CN must match hostname */
  char *CApath;          /* certificate dir (doesn't work on windows) */
  char *CAfile;          /* cerficate to verify peer against */
  char *random_file;     /* path to file containing "random" data */
  char *egdsocket;       /* path to file containing the EGD daemon socket */
  char *cipher_list;     /* list of ciphers to use */
  long numsessions;      /* SSL session id cache size */
  curl_ssl_ctx_callback fsslctx; /* function to initialize ssl ctx */
  void *fsslctxp;        /* parameter for call back */
  bool sessionid;        /* cache session IDs or not */
};

/* information stored about one single SSL session */
struct curl_ssl_session {
  char *name;       /* host name for which this ID was used */
  void *sessionid;  /* as returned from the SSL layer */
  size_t idsize;    /* if known, otherwise 0 */
  long age;         /* just a number, the higher the more recent */
  unsigned short remote_port; /* remote port to connect to */
  struct ssl_config_data ssl_config; /* setup for this session */
};

/* Struct used for Digest challenge-response authentication */
struct digestdata {
  char *nonce;
  char *cnonce;
  char *realm;
  int algo;
  bool stale; /* set true for re-negotiation */
  char *opaque;
  char *qop;
  char *algorithm;
  int nc; /* nounce count */
};

typedef enum {
  NTLMSTATE_NONE,
  NTLMSTATE_TYPE1,
  NTLMSTATE_TYPE2,
  NTLMSTATE_TYPE3,
  NTLMSTATE_LAST
} curlntlm;

#ifdef USE_WINDOWS_SSPI
/* When including these headers, you must define either SECURITY_WIN32
 * or SECURITY_KERNEL, indicating who is compiling the code.
 */
#define SECURITY_WIN32 1
#include <security.h>
#include <sspi.h>
#include <rpc.h>
#endif

#if defined(CURL_DOES_CONVERSIONS) && defined(HAVE_ICONV)
#include <iconv.h>
#endif

/* Struct used for NTLM challenge-response authentication */
struct ntlmdata {
  curlntlm state;
#ifdef USE_WINDOWS_SSPI
  CredHandle handle;
  CtxtHandle c_handle;
  SEC_WINNT_AUTH_IDENTITY identity;
  SEC_WINNT_AUTH_IDENTITY *p_identity;
  int has_handles;
  void *type_2;
  int n_type_2;
#else
  unsigned int flags;
  unsigned char nonce[8];
#endif
};

#ifdef HAVE_GSSAPI
struct negotiatedata {
  bool gss; /* Whether we're processing GSS-Negotiate or Negotiate */
  const char* protocol; /* "GSS-Negotiate" or "Negotiate" */
  OM_uint32 status;
  gss_ctx_id_t context;
  gss_name_t server_name;
  gss_buffer_desc output_token;
};
#endif

/****************************************************************************
 * HTTP unique setup
 ***************************************************************************/
struct HTTP {
  struct FormData *sendit;
  curl_off_t postsize; /* off_t to handle large file sizes */
  char *postdata;

  const char *p_pragma;      /* Pragma: string */
  const char *p_accept;      /* Accept: string */
  curl_off_t readbytecount;
  curl_off_t writebytecount;

  /* For FORM posting */
  struct Form form;

  struct back {
    curl_read_callback fread_func; /* backup storage for fread pointer */
    void *fread_in;           /* backup storage for fread_in pointer */
    char *postdata;
    curl_off_t postsize;
  } backup;

  enum {
    HTTPSEND_NADA,    /* init */
    HTTPSEND_REQUEST, /* sending a request */
    HTTPSEND_BODY,    /* sending body */
    HTTPSEND_LAST     /* never use this */
  } sending;

  void *send_buffer; /* used if the request couldn't be sent in one chunk,
                        points to an allocated send_buffer struct */
};

/****************************************************************************
 * FTP unique setup
 ***************************************************************************/
typedef enum {
  FTP_STOP,    /* do nothing state, stops the state machine */
  FTP_WAIT220, /* waiting for the initial 220 response immediately after
                  a connect */
  FTP_AUTH,
  FTP_USER,
  FTP_PASS,
  FTP_ACCT,
  FTP_PBSZ,
  FTP_PROT,
  FTP_CCC,
  FTP_PWD,
  FTP_QUOTE, /* waiting for a response to a command sent in a quote list */
  FTP_RETR_PREQUOTE,
  FTP_STOR_PREQUOTE,
  FTP_POSTQUOTE,
  FTP_CWD,  /* change dir */
  FTP_MKD,  /* if the dir didn't exist */
  FTP_MDTM, /* to figure out the datestamp */
  FTP_TYPE, /* to set type when doing a head-like request */
  FTP_LIST_TYPE, /* set type when about to do a dir list */
  FTP_RETR_TYPE, /* set type when about to RETR a file */
  FTP_STOR_TYPE, /* set type when about to STOR a file */
  FTP_SIZE, /* get the remote file's size for head-like request */
  FTP_RETR_SIZE, /* get the remote file's size for RETR */
  FTP_STOR_SIZE, /* get the size for (resumed) STOR */
  FTP_REST, /* when used to check if the server supports it in head-like */
  FTP_RETR_REST, /* when asking for "resume" in for RETR */
  FTP_PORT, /* generic state for PORT, LPRT and EPRT, check count1 */
  FTP_PASV, /* generic state for PASV and EPSV, check count1 */
  FTP_LIST, /* generic state for LIST, NLST or a custom list command */
  FTP_RETR,
  FTP_STOR, /* generic state for STOR and APPE */
  FTP_QUIT,
  FTP_LAST  /* never used */
} ftpstate;

typedef enum {
  FTPFILE_MULTICWD  = 1, /* as defined by RFC1738 */
  FTPFILE_NOCWD     = 2, /* use SIZE / RETR / STOR on the full path */
  FTPFILE_SINGLECWD = 3  /* make one CWD, then SIZE / RETR / STOR on the file */
} curl_ftpfile;

typedef enum {
  FTPTRANSFER_BODY, /* yes do transfer a body */
  FTPTRANSFER_INFO, /* do still go through to get info/headers */
  FTPTRANSFER_NONE, /* don't get anything and don't get info */
  FTPTRANSFER_LAST  /* end of list marker, never used */
} curl_ftptransfer;

/* This FTP struct is used in the SessionHandle. All FTP data that is
   connection-oriented must be in FTP_conn to properly deal with the fact that
   perhaps the SessionHandle is changed between the times the connection is
   used. */
struct FTP {
  curl_off_t *bytecountp;
  char *user;    /* user name string */
  char *passwd;  /* password string */

  /* transfer a file/body or not, done as a typedefed enum just to make
     debuggers display the full symbol and not just the numerical value */
  curl_ftptransfer transfer;
  curl_off_t downloadsize;
};

/* ftp_conn is used for striuct connection-oriented data in the connectdata
   struct */
struct ftp_conn {
  char *entrypath; /* the PWD reply when we logged on */
  char **dirs;   /* realloc()ed array for path components */
  int dirdepth;  /* number of entries used in the 'dirs' array */
  int diralloc;  /* number of entries allocated for the 'dirs' array */
  char *file;    /* decoded file */
  char *cache;       /* data cache between getresponse()-calls */
  curl_off_t cache_size; /* size of cache in bytes */
  bool dont_check;  /* Set to TRUE to prevent the final (post-transfer)
                       file size and 226/250 status check. It should still
                       read the line, just ignore the result. */
  long response_time; /* When no timeout is given, this is the amount of
                         seconds we await for an FTP response. Initialized
                         in Curl_ftp_connect() */
  bool ctl_valid;   /* Tells Curl_ftp_quit() whether or not to do anything. If
                       the connection has timed out or been closed, this
                       should be FALSE when it gets to Curl_ftp_quit() */
  bool cwddone;     /* if it has been determined that the proper CWD combo
                       already has been done */
  bool cwdfail;     /* set TRUE if a CWD command fails, as then we must prevent
                       caching the current directory */
  char *prevpath;   /* conn->path from the previous transfer */
  char transfertype; /* set by ftp_transfertype for use by Curl_client_write()a
                        and others (A/I or zero) */
  size_t nread_resp; /* number of bytes currently read of a server response */
  char *linestart_resp; /* line start pointer for the FTP server response
                           reader function */

  int count1; /* general purpose counter for the state machine */
  int count2; /* general purpose counter for the state machine */
  int count3; /* general purpose counter for the state machine */
  char *sendthis; /* allocated pointer to a buffer that is to be sent to the
                     ftp server */
  size_t sendleft; /* number of bytes left to send from the sendthis buffer */
  size_t sendsize; /* total size of the sendthis buffer */
  struct timeval response; /* set to Curl_tvnow() when a command has been sent
                              off, used to time-out response reading */
  ftpstate state; /* always use ftp.c:state() to change state! */
};

/****************************************************************************
 * SSH unique setup
 ***************************************************************************/
typedef enum {
  SSH_NO_STATE = -1,  /* Used for "nextState" so say there is none */
  SSH_STOP = 0,       /* do nothing state, stops the state machine */

  SSH_S_STARTUP,      /* Session startup, First state in SSH-CONNECT */
  SSH_AUTHLIST,
  SSH_AUTH_PKEY_INIT,
  SSH_AUTH_PKEY,
  SSH_AUTH_PASS_INIT,
  SSH_AUTH_PASS,
  SSH_AUTH_HOST_INIT,
  SSH_AUTH_HOST,
  SSH_AUTH_KEY_INIT,
  SSH_AUTH_KEY,
  SSH_AUTH_DONE,
  SSH_SFTP_INIT,
  SSH_SFTP_REALPATH,   /* Last state in SSH-CONNECT */

  SSH_SFTP_QUOTE_INIT, /* First state in SFTP-DO */
  SSH_SFTP_POSTQUOTE_INIT, /* (Possibly) First state in SFTP-DONE */
  SSH_SFTP_QUOTE,
  SSH_SFTP_NEXT_QUOTE,
  SSH_SFTP_QUOTE_STAT,
  SSH_SFTP_QUOTE_SETSTAT,
  SSH_SFTP_QUOTE_SYMLINK,
  SSH_SFTP_QUOTE_MKDIR,
  SSH_SFTP_QUOTE_RENAME,
  SSH_SFTP_QUOTE_RMDIR,
  SSH_SFTP_QUOTE_UNLINK,
  SSH_SFTP_TRANS_INIT,
  SSH_SFTP_UPLOAD_INIT,
  SSH_SFTP_CREATE_DIRS_INIT,
  SSH_SFTP_CREATE_DIRS,
  SSH_SFTP_CREATE_DIRS_MKDIR,
  SSH_SFTP_READDIR_INIT,
  SSH_SFTP_READDIR,
  SSH_SFTP_READDIR_LINK,
  SSH_SFTP_READDIR_BOTTOM,
  SSH_SFTP_READDIR_DONE,
  SSH_SFTP_DOWNLOAD_INIT,
  SSH_SFTP_DOWNLOAD_STAT, /* Last state in SFTP-DO */
  SSH_SFTP_CLOSE,    /* Last state in SFTP-DONE */
  SSH_SFTP_SHUTDOWN, /* First state in SFTP-DISCONNECT */
  SSH_SCP_TRANS_INIT, /* First state in SCP-DO */
  SSH_SCP_UPLOAD_INIT,
  SSH_SCP_DOWNLOAD_INIT,
  SSH_SCP_DONE,
  SSH_SCP_SEND_EOF,
  SSH_SCP_WAIT_EOF,
  SSH_SCP_WAIT_CLOSE,
  SSH_SCP_CHANNEL_FREE,   /* Last state in SCP-DONE */
  SSH_SESSION_DISCONNECT, /* First state in SCP-DISCONNECT */
  SSH_SESSION_FREE,       /* Last state in SCP/SFTP-DISCONNECT */
  SSH_QUIT,
  SSH_LAST  /* never used */
} sshstate;

/* this struct is used in the HandleData struct which is part of the
   SessionHandle, which means this is used on a per-easy handle basis.
   Everything that is strictly related to a connection is banned from this
   struct. */
struct SSHPROTO {
  char *path;                   /* the path we operate on */
};

/* ssh_conn is used for struct connection-oriented data in the connectdata
   struct */
struct ssh_conn {
  const char *authlist;       /* List of auth. methods, managed by libssh2 */
#ifdef USE_LIBSSH2
  const char *passphrase;     /* passphrase to use */
  char *rsa_pub;              /* path name */
  char *rsa;                  /* path name */
  bool authed;                /* the connection has been authenticated fine */
  sshstate state;             /* always use ssh.c:state() to change state! */
  sshstate nextstate;         /* the state to goto after stopping */
  CURLcode actualcode;        /* the actual error code */
  struct curl_slist *quote_item; /* for the quote option */
  char *quote_path1;          /* two generic pointers for the QUOTE stuff */
  char *quote_path2;
  LIBSSH2_SFTP_ATTRIBUTES quote_attrs; /* used by the SFTP_QUOTE state */
  char *homedir;              /* when doing SFTP we figure out home dir in the
                                 connect phase */

  /* Here's a set of struct members used by the SFTP_READDIR state */
  LIBSSH2_SFTP_ATTRIBUTES readdir_attrs;
  char *readdir_filename;
  char *readdir_longentry;
  int readdir_len, readdir_totalLen, readdir_currLen;
  char *readdir_line;
  char *readdir_linkPath;
  /* end of READDIR stuff */

  int secondCreateDirs;         /* counter use by the code to see if the
                                   second attempt has been made to change
                                   to/create a directory */
  char *slash_pos;              /* used by the SFTP_CREATE_DIRS state */
  LIBSSH2_SESSION *ssh_session; /* Secure Shell session */
  LIBSSH2_CHANNEL *ssh_channel; /* Secure Shell channel handle */
  LIBSSH2_SFTP *sftp_session;   /* SFTP handle */
  LIBSSH2_SFTP_HANDLE *sftp_handle;
#endif /* USE_LIBSSH2 */
};


/****************************************************************************
 * FILE unique setup
 ***************************************************************************/
struct FILEPROTO {
  char *path; /* the path we operate on */
  char *freepath; /* pointer to the allocated block we must free, this might
                     differ from the 'path' pointer */
  int fd;     /* open file descriptor to read from! */
};

/*
 * Boolean values that concerns this connection.
 */
struct ConnectBits {
  bool close; /* if set, we close the connection after this request */
  bool reuse; /* if set, this is a re-used connection */
  bool proxy; /* if set, this transfer is done through a proxy - any type */
  bool httpproxy;    /* if set, this transfer is done through a http proxy */
  bool user_passwd;    /* do we use user+password for this connection? */
  bool proxy_user_passwd; /* user+password for the proxy? */
  bool ipv6_ip; /* we communicate with a remote site specified with pure IPv6
                   IP address */
  bool ipv6;    /* we communicate with a site using an IPv6 address */

  bool do_more; /* this is set TRUE if the ->curl_do_more() function is
                   supposed to be called, after ->curl_do() */

  bool tcpconnect;    /* the TCP layer (or simimlar) is connected, this is set
                         the first time on the first connect function call */
  bool protoconnstart;/* the protocol layer has STARTED its operation after
                         the TCP layer connect */

  bool retry;         /* this connection is about to get closed and then
                         re-attempted at another connection. */
  bool tunnel_proxy;  /* if CONNECT is used to "tunnel" through the proxy.
                         This is implicit when SSL-protocols are used through
                         proxies, but can also be enabled explicitly by
                         apps */
  bool tunnel_connecting; /* TRUE while we're still waiting for a proxy CONNECT
                           */
  bool authneg;       /* TRUE when the auth phase has started, which means
                         that we are creating a request with an auth header,
                         but it is not the final request in the auth
                         negotiation. */
  bool rewindaftersend;/* TRUE when the sending couldn't be stopped even
                          though it will be discarded. When the whole send
                          operation is done, we must call the data rewind
                          callback. */
  bool ftp_use_epsv;  /* As set with CURLOPT_FTP_USE_EPSV, but if we find out
                         EPSV doesn't work we disable it for the forthcoming
                         requests */

  bool ftp_use_eprt;  /* As set with CURLOPT_FTP_USE_EPRT, but if we find out
                         EPRT doesn't work we disable it for the forthcoming
                         requests */
  bool netrc;         /* name+password provided by netrc */

  bool done;          /* set to FALSE when Curl_do() is called and set to TRUE
                         when Curl_done() is called, to prevent Curl_done() to
                         get invoked twice when the multi interface is
                         used. */
  bool stream_was_rewound; /* Indicates that the stream was rewound after a
                              request read past the end of its response byte
                              boundary */
  bool proxy_connect_closed; /* set true if a proxy disconnected the
                                connection in a CONNECT request with auth, so
                                that libcurl should reconnect and continue. */
  bool bound; /* set true if bind() has already been done on this socket/
                 connection */
};

struct hostname {
  char *rawalloc; /* allocated "raw" version of the name */
  char *encalloc; /* allocated IDN-encoded version of the name */
  char *name;     /* name to use internally, might be encoded, might be raw */
  char *dispname; /* name to display, as 'name' might be encoded */
};

/*
 * Flags on the keepon member of the Curl_transfer_keeper
 */

#define KEEP_NONE  0
#define KEEP_READ  (1<<0)     /* there is or may be data to read */
#define KEEP_WRITE (1<<1)     /* there is or may be data to write */
#define KEEP_READ_HOLD (1<<2) /* when set, no reading should be done but there
                                 might still be data to read */
#define KEEP_WRITE_HOLD (1<<3) /* when set, no writing should be done but there
                                  might still be data to write */
#define KEEP_READ_PAUSE (1<<4) /* reading is paused */
#define KEEP_WRITE_PAUSE (1<<5) /* writing is paused */

#define KEEP_READBITS (KEEP_READ | KEEP_READ_HOLD | KEEP_READ_PAUSE)
#define KEEP_WRITEBITS (KEEP_WRITE | KEEP_WRITE_HOLD | KEEP_WRITE_PAUSE)


#ifdef HAVE_LIBZ
typedef enum {
  ZLIB_UNINIT,          /* uninitialized */
  ZLIB_INIT,            /* initialized */
  ZLIB_GZIP_HEADER,     /* reading gzip header */
  ZLIB_GZIP_INFLATING,  /* inflating gzip stream */
  ZLIB_INIT_GZIP        /* initialized in transparent gzip mode */
} zlibInitState;
#endif

#if defined(USE_ARES) || defined(USE_THREADING_GETHOSTBYNAME) || \
    defined(USE_THREADING_GETADDRINFO)
struct Curl_async {
  char *hostname;
  int port;
  struct Curl_dns_entry *dns;
  bool done;  /* set TRUE when the lookup is complete */
  int status; /* if done is TRUE, this is the status from the callback */
  void *os_specific;  /* 'struct thread_data' for Windows */
};
#endif

#define FIRSTSOCKET     0
#define SECONDARYSOCKET 1

/* These function pointer types are here only to allow easier typecasting
   within the source when we need to cast between data pointers (such as NULL)
   and function pointers. */
typedef CURLcode (*Curl_do_more_func)(struct connectdata *);
typedef CURLcode (*Curl_done_func)(struct connectdata *, CURLcode, bool);


enum expect100 {
  EXP100_SEND_DATA,           /* enough waiting, just send the body now */
  EXP100_AWAITING_CONTINUE,   /* waiting for the 100 Continue header */
  EXP100_SENDING_REQUEST,     /* still sending the request but will wait for
                                 the 100 header once done with the request */
  EXP100_FAILED               /* used on 417 Expectation Failed */
};

/*
 * Request specific data in the easy handle (SessionHandle).  Previously,
 * these members were on the connectdata struct but since a conn struct may
 * now be shared between different SessionHandles, we store connection-specifc
 * data here. This struct only keeps stuff that's interesting for *this*
 * request, as it will be cleared between multiple ones
 */
struct SingleRequest {
  curl_off_t size;        /* -1 if unknown at this point */
  curl_off_t *bytecountp; /* return number of bytes read or NULL */

  curl_off_t maxdownload; /* in bytes, the maximum amount of data to fetch,
                             -1 means unlimited */
  curl_off_t *writebytecountp; /* return number of bytes written or NULL */

  curl_off_t bytecount;         /* total number of bytes read */
  curl_off_t writebytecount;    /* number of bytes written */

  long headerbytecount;         /* only count received headers */
  long deductheadercount; /* this amount of bytes doesn't count when we check
                             if anything has been transfered at the end of a
                             connection. We use this counter to make only a
                             100 reply (without a following second response
                             code) result in a CURLE_GOT_NOTHING error code */

  struct timeval start;         /* transfer started at this time */
  struct timeval now;           /* current time */
  bool header;                  /* incoming data has HTTP header */
  enum {
    HEADER_NORMAL,              /* no bad header at all */
    HEADER_PARTHEADER,          /* part of the chunk is a bad header, the rest
                                   is normal data */
    HEADER_ALLBAD               /* all was believed to be header */
  } badheader;                  /* the header was deemed bad and will be
                                   written as body */
  int headerline;               /* counts header lines to better track the
                                   first one */
  char *hbufp;                  /* points at *end* of header line */
  size_t hbuflen;
  char *str;                    /* within buf */
  char *str_start;              /* within buf */
  char *end_ptr;                /* within buf */
  char *p;                      /* within headerbuff */
  bool content_range;           /* set TRUE if Content-Range: was found */
  curl_off_t offset;            /* possible resume offset read from the
                                   Content-Range: header */
  int httpcode;                 /* error code from the 'HTTP/1.? XXX' line */
  int httpversion;              /* the HTTP version*10 */
  struct timeval start100;      /* time stamp to wait for the 100 code from */
  enum expect100 exp100;        /* expect 100 continue state */

  int content_encoding;         /* What content encoding. sec 3.5, RFC2616. */

#define IDENTITY 0              /* No encoding */
#define DEFLATE 1               /* zlib delfate [RFC 1950 & 1951] */
#define GZIP 2                  /* gzip algorithm [RFC 1952] */
#define COMPRESS 3              /* Not handled, added for completeness */

#ifdef HAVE_LIBZ
  zlibInitState zlib_init;      /* possible zlib init state;
                                   undefined if Content-Encoding header. */
  z_stream z;                   /* State structure for zlib. */
#endif

  time_t timeofdoc;
  long bodywrites;

  char *buf;
  char *uploadbuf;
  curl_socket_t maxfd;

  int keepon;

  bool upload_done; /* set to TRUE when doing chunked transfer-encoding upload
                       and we're uploading the last chunk */

  bool ignorebody;  /* we read a response-body but we ignore it! */
  bool ignorecl;    /* This HTTP response has no body so we ignore the Content-
                       Length: header */

  char *newurl; /* This can only be set if a Location: was in the
                   document headers */

  /* 'upload_present' is used to keep a byte counter of how much data there is
     still left in the buffer, aimed for upload. */
  ssize_t upload_present;

   /* 'upload_fromhere' is used as a read-pointer when we uploaded parts of a
      buffer, so the next read should read from where this pointer points to,
      and the 'upload_present' contains the number of bytes available at this
      position */
  char *upload_fromhere;

  bool chunk; /* if set, this is a chunked transfer-encoding */
  bool upload_chunky; /* set TRUE if we are doing chunked transfer-encoding
                         on upload */
  bool getheader;     /* TRUE if header parsing is wanted */

  bool forbidchunk;   /* used only to explicitly forbid chunk-upload for
                         specific upload buffers. See readmoredata() in
                         http.c for details. */
  bool trailerhdrpresent; /* Set when Trailer: header found in HTTP response.
                             Required to determine whether to look for trailers
                             in case of Transfer-Encoding: chunking */
};

/*
 * Specific protocol handler.
 */

struct Curl_handler {
  const char * scheme;        /* URL scheme name. */

  /* Complement to setup_connection_internals(). */
  CURLcode (*setup_connection)(struct connectdata *);

  /* These two functions MUST be set to be protocol dependent */
  CURLcode (*do_it)(struct connectdata *, bool *done);
  Curl_done_func done;

  /* If the curl_do() function is better made in two halves, this
   * curl_do_more() function will be called afterwards, if set. For example
   * for doing the FTP stuff after the PASV/PORT command.
   */
  Curl_do_more_func do_more;

  /* This function *MAY* be set to a protocol-dependent function that is run
   * after the connect() and everything is done, as a step in the connection.
   * The 'done' pointer points to a bool that should be set to TRUE if the
   * function completes before return. If it doesn't complete, the caller
   * should call the curl_connecting() function until it is.
   */
  CURLcode (*connect_it)(struct connectdata *, bool *done);

  /* See above. Currently only used for FTP. */
  CURLcode (*connecting)(struct connectdata *, bool *done);
  CURLcode (*doing)(struct connectdata *, bool *done);

  /* Called from the multi interface during the PROTOCONNECT phase, and it
     should then return a proper fd set */
  int (*proto_getsock)(struct connectdata *conn,
                       curl_socket_t *socks,
                       int numsocks);

  /* Called from the multi interface during the DOING phase, and it should
     then return a proper fd set */
  int (*doing_getsock)(struct connectdata *conn,
                       curl_socket_t *socks,
                       int numsocks);

  /* This function *MAY* be set to a protocol-dependent function that is run
   * by the curl_disconnect(), as a step in the disconnection.
   */
  CURLcode (*disconnect)(struct connectdata *);

  long defport;       /* Default port. */
  long protocol;      /* PROT_* flags concerning the protocol set */
};

/*
 * The connectdata struct contains all fields and variables that should be
 * unique for an entire connection.
 */
struct connectdata {
  /* 'data' is the CURRENT SessionHandle using this connection -- take great
     caution that this might very well vary between different times this
     connection is used! */
  struct SessionHandle *data;

  /* chunk is for HTTP chunked encoding, but is in the general connectdata
     struct only because we can do just about any protocol through a HTTP proxy
     and a HTTP proxy may in fact respond using chunked encoding */
  struct Curl_chunker chunk;

  bool inuse; /* This is a marker for the connection cache logic. If this is
                 TRUE this handle is being used by an easy handle and cannot
                 be used by any other easy handle without careful
                 consideration (== only for pipelining). */

  /**** Fields set when inited and not modified again */
  long connectindex; /* what index in the connection cache connects index this
                        particular struct has */
  long protocol; /* PROT_* flags concerning the protocol set */
#define PROT_MISSING (1<<0)
#define PROT_HTTP    (1<<2)
#define PROT_HTTPS   (1<<3)
#define PROT_FTP     (1<<4)
#define PROT_TELNET  (1<<5)
#define PROT_DICT    (1<<6)
#define PROT_LDAP    (1<<7)
#define PROT_FILE    (1<<8)
#define PROT_FTPS    (1<<9)
#define PROT_SSL     (1<<10) /* protocol requires SSL */
#define PROT_TFTP    (1<<11)
#define PROT_SCP     (1<<12)
#define PROT_SFTP    (1<<13)

#define PROT_CLOSEACTION PROT_FTP /* these ones need action before socket
                                     close */

  /* 'dns_entry' is the particular host we use. This points to an entry in the
     DNS cache and it will not get pruned while locked. It gets unlocked in
     Curl_done(). This entry will be NULL if the connection is re-used as then
     there is no name resolve done. */
  struct Curl_dns_entry *dns_entry;

  /* 'ip_addr' is the particular IP we connected to. It points to a struct
     within the DNS cache, so this pointer is only valid as long as the DNS
     cache entry remains locked. It gets unlocked in Curl_done() */
  Curl_addrinfo *ip_addr;

  /* 'ip_addr_str' is the ip_addr data as a human readable malloc()ed string.
     It remains available as long as the connection does, which is longer than
     the ip_addr itself. Set with Curl_store_ip_addr() when ip_addr has been
     set. */
  char *ip_addr_str;

  char protostr[16];  /* store the protocol string in this buffer */
  int socktype;  /* SOCK_STREAM or SOCK_DGRAM */

  struct hostname host;
  struct hostname proxy;

  long port;       /* which port to use locally */
  unsigned short remote_port; /* what remote port to connect to,
                                 not the proxy port! */

  char *user;    /* user name string, allocated */
  char *passwd;  /* password string, allocated */

  char *proxyuser;    /* proxy user name string, allocated */
  char *proxypasswd;  /* proxy password string, allocated */
  curl_proxytype proxytype; /* what kind of proxy that is in use */

  struct timeval now;     /* "current" time */
  struct timeval created; /* creation time */
  curl_socket_t sock[2]; /* two sockets, the second is used for the data
                            transfer when doing FTP */

  struct ssl_connect_data ssl[2]; /* this is for ssl-stuff */
  struct ssl_config_data ssl_config;

  struct ConnectBits bits;    /* various state-flags for this connection */

  const struct Curl_handler * handler;  /* Connection's protocol handler. */

  /**** curl_get() phase fields */

  curl_socket_t sockfd;   /* socket to read from or CURL_SOCKET_BAD */
  curl_socket_t writesockfd; /* socket to write to, it may very
                                well be the same we read from.
                                CURL_SOCKET_BAD disables */

  /** Dynamicly allocated strings, may need to be freed before this **/
  /** struct is killed.                                             **/
  struct dynamically_allocated_data {
    char *proxyuserpwd; /* free later if not NULL! */
    char *uagent; /* free later if not NULL! */
    char *accept_encoding; /* free later if not NULL! */
    char *userpwd; /* free later if not NULL! */
    char *rangeline; /* free later if not NULL! */
    char *ref; /* free later if not NULL! */
    char *host; /* free later if not NULL */
    char *cookiehost; /* free later if not NULL */
  } allocptr;

  int sec_complete; /* if kerberos is enabled for this connection */
#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
  enum protection_level command_prot;
  enum protection_level data_prot;
  enum protection_level request_data_prot;
  size_t buffer_size;
  struct krb4buffer in_buffer, out_buffer;
  void *app_data;
  const struct Curl_sec_client_mech *mech;
  struct sockaddr_in local_addr;
#endif

  bool readchannel_inuse;  /* whether the read channel is in use by an easy
                              handle */
  bool writechannel_inuse; /* whether the write channel is in use by an easy
                              handle */
  bool server_supports_pipelining; /* TRUE if server supports pipelining,
                                      set after first response */

  struct curl_llist *send_pipe; /* List of handles waiting to
                                   send on this pipeline */
  struct curl_llist *recv_pipe; /* List of handles waiting to read
                                   their responses on this pipeline */
  struct curl_llist *pend_pipe; /* List of pending handles on
                                   this pipeline */
#define MAX_PIPELINE_LENGTH 5

  char* master_buffer; /* The master buffer allocated on-demand;
                          used for pipelining. */
  size_t read_pos; /* Current read position in the master buffer */
  size_t buf_len; /* Length of the buffer?? */


  curl_seek_callback seek_func; /* function that seeks the input */
  void *seek_client;            /* pointer to pass to the seek() above */

  /*************** Request - specific items ************/

  /* previously this was in the urldata struct */
  curl_read_callback fread_func; /* function that reads the input */
  void *fread_in;           /* pointer to pass to the fread() above */

  struct ntlmdata ntlm;     /* NTLM differs from other authentication schemes
                               because it authenticates connections, not
                               single requests! */
  struct ntlmdata proxyntlm; /* NTLM data for proxy */

  char syserr_buf [256]; /* buffer for Curl_strerror() */

#if defined(USE_ARES) || defined(USE_THREADING_GETHOSTBYNAME) || \
    defined(USE_THREADING_GETADDRINFO)
  /* data used for the asynch name resolve callback */